Method, Apparatus, and System for Monitoring and Maintenance Based on Contact-State Detection of a Railway Signal Junction Box

Abstract

The present invention relates to a method, device, and system for monitoring and maintenance based on contact state detection of a railway signal junction box. The present invention comprises a junction box body installed at a railway signal site, a plurality of block terminals arranged inside the junction box body and into which a cable conductor is inserted, a lower terminal metal part in contact with the cable conductor, a fastening bolt and a pressing plate body that press the cable conductor toward the lower terminal metal part, a contact state detection unit that detects a contact state based on a change in the position of the pressing plate body, a control unit that collects terminal-specific state information, and an information transmission unit that transmits the terminal-specific state information to an external maintenance system.

Description

Technology Field

[0001] The present invention relates to a monitoring and maintenance technology for a railway signal junction box that detects the contact status of block terminals provided in a field junction box of a railway signal facility and transmits the detected terminal-specific status information to an external maintenance system. Background Technology

[0003] Railway signaling equipment is a facility that transmits and receives information related to train operation location, route setting, track switching, signal display, and safety verification via electrical signals. Various signal lights, track circuit devices, switches, relays, control panels, branch connection boxes, and cable connection boxes may be installed at the site. In such railway signaling equipment, multiple cables are laid between the field devices and the control devices, and the ends of the cables are inserted into block terminals inside the connection boxes to be electrically connected.

[0004] A typical railway signaling junction box includes a junction box body to protect the cable connection from the external environment, and a plurality of block terminals are arranged inside the junction box body. Each block terminal has a cable insertion part into which a cable conductor is inserted, and the cable conductor comes into contact with the metal part of the lower terminal of the block terminal. At this time, the cable conductor is pressed toward the metal part of the lower terminal through a pressing plate or a pressure plate by the tightening force of a fastening bolt, thereby maintaining an electrical contact state.

[0005] However, junction boxes at railway signaling sites are often installed near tracks and can be affected by repetitive vibrations caused by passing trains, changes in ambient temperature, humidity, dust, repeated fastening and unfastening during maintenance, and deformation of components due to long-term use. In such environments, the tightening force of the fastening bolts secured to the block terminals may gradually decrease, or the pressure exerted by the pressing plate pressing the cable conductor may diminish. As a result, the contact pressure between the cable conductor and the metal part of the lower terminal decreases, which can lead to increased contact resistance, momentary signal instability, or intermittent contact failure.

[0006] In particular, intermittent contact failure is not a continuous malfunction but may occur only at specific moments when train vibrations or external shocks are applied. In such cases, even if a field maintenance worker opens the junction box for a visual inspection or uses standard measuring instruments, the contact status may temporarily appear normal at the time of inspection. Therefore, relying solely on conventional inspection methods presents a problem in that it is difficult to quickly and accurately identify which block terminal has experienced a decrease in fastening force or which terminal has reached a state of risk for contact failure due to repeated vibrations.

[0007] Conventionally, technologies have been proposed to electrically monitor the status of railway signaling equipment or to transmit equipment status information to maintenance systems. Additionally, in the field of general electrical connectors or terminal connections, technologies have been proposed to detect connection failures, connector fastening status, or contact abnormalities. However, these conventional technologies have generally focused on changes in electrical signals, contact continuity, connector insertion status, or the transmission of status information at the equipment level.

[0008] Accordingly, conventional technology alone has limitations in mechanically indicating the state in which a pressing plate actually changes position due to a decrease in the fastening force of a fastening bolt at a block terminal inside a railway signal field junction box, detecting the indicated state for each terminal, and maintaining temporary contact so that electrical contact between the cable conductor and the lower terminal metal part is not immediately lost even after a decrease in fastening force occurs.

[0009] Furthermore, railway signal junction boxes often feature a dense arrangement of multiple block terminals. In such cases, maintenance personnel must sequentially inspect various terminals to locate the faulty one. While visual inspection may be relatively easy if the fastening bolt has completely loosened and the cable has detached, it is difficult to detect clear external abnormalities when only the contact pressure has decreased due to a partial reduction in fastening force. Therefore, a field verification method is required to quickly identify terminals at risk of contact failure among the numerous block terminals.

[0010] Furthermore, in railway environments, it is important for maintenance not only to determine at what moment a terminal entered a faulty state, but also to identify the extent to which it reached the abnormal state after being subjected to a cumulative amount of train vibration. However, conventional methods such as simple continuity checks or one-time inspections make it difficult to distinguish and manage the vibration accumulation history for each block terminal, the degree of vibration exposure before and after the occurrence of an abnormality, and the degree of dangerous vibration accumulation while maintaining temporary contact.

[0011] Therefore, a new type of monitoring and maintenance technology is required that directly utilizes the positional change of a pressing plate caused by a decrease in the fastening force of a fastening bolt at a block terminal of a railway signal junction box to detect contact abnormalities, transmits the corresponding abnormal status to a maintenance system, maintains temporary contact of the cable conductor after the fastening force decreases, manages accumulated history of train vibrations by terminal, and allows field maintenance personnel to intuitively identify abnormal terminals while the junction box is open. Prior art literature

[0013] KR102132378B1KR101989381B1KR101443660B1KR20170034541A The problem to be solved

[0014] The present invention aims to provide a method, device, and system for monitoring and maintenance based on contact state detection of a railway signal junction box, capable of detecting, on a terminal-by-terminal basis, a state in which the contact pressure between a cable conductor and a lower terminal metal part decreases due to a decrease in the fastening force of a fastening bolt at a block terminal inside a junction box installed at a railway signal site.

[0015] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact state detection of a railway signal junction box, which can mechanically indicate and detect a state of reduced compression force between a cable conductor and a lower terminal metal part by utilizing the change in position of a pressing plate body according to a change in the applied pressure of a fastening bolt, even when the cable conductor inserted into the block terminal is not outwardly detached.

[0016] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact status detection of a railway signal connection box, which allows for the identification of abnormal contact status of a block terminal on-site without using a separate measuring instrument, by ensuring that when the main body of the pressing plate is in a normal pressurized position, the lateral indicator is maintained in a state where it is housed inside the indicator receiving groove, and when the main body of the pressing plate rises due to a decrease in the pressure of the fastening bolt, the lateral indicator is made to protrude through the indicator guide window.

[0017] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact status detection of a railway signal junction box, wherein even if the lower pressing force of the fastening bolt decreases due to train vibration, repeated inspection, temperature change, or reduction in fastening force, the first auxiliary pressing part temporarily presses the cable conductor toward the lower terminal metal part, thereby delaying the immediate loss of electrical contact between the cable conductor and the lower terminal metal part.

[0018] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact state detection of a railway signal junction box, which can delay the rapid deterioration of the contact state until a maintenance worker arrives at the site by releasing a second auxiliary locking piece and protruding a second auxiliary pressing piece downward to additionally temporarily pressurize a cable conductor according to a release signal from a control unit after the protruding state of a lateral indicator piece is detected by a contact state detection unit.

[0019] In addition, the present invention aims to provide a contact state detection-based monitoring and maintenance method, apparatus, and system for a railway signal junction box, which considers that train vibrations occurring repeatedly in a railway environment act cumulatively on block terminals, and records the fine up-and-down movement of a pressing plate body stepwise through a vibration recording lever and a gear recording wheel, and manages the accumulated vibration value for each block terminal using the accumulated movement position detected by the recording wheel position detection unit.

[0020] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact state detection of a railway signal junction box, wherein the accumulated vibration value is distinguished based on the protrusion time of a lateral indicator and the activation time of a second auxiliary press part, and the accumulated vibration value before the lateral indicator protrudes, the accumulated vibration value from the time the lateral indicator protrudes until the time the second auxiliary press part is activated, and the accumulated vibration value of a dangerous state after the second auxiliary press part is activated are stored and transmitted as terminal-specific state information.

[0021] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact status detection of a railway signal junction box, wherein when the junction box door is opened, a plurality of search bar modules move in the search direction and come into contact with an already protruding lateral indicator, and by illuminating the light-emitting indicator of the corresponding search bar module, a field maintenance worker can immediately identify the location of a block terminal among a plurality of block terminals where a contact status abnormality has occurred.

[0022] In addition, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact status detection of a railway signal junction box, which allows additional verification of abnormal block terminals newly generated during the re-closing process after maintenance by operating a batch loading bar to move a plurality of search bar modules in the loading direction before closing the junction box door after maintenance work, and by allowing verification through a second contact switch and a light-emitting display if a newly protruding lateral indicator exists during the operation or immediately before closing.

[0023] Furthermore, the present invention aims to provide a method, device, and system for monitoring and maintenance based on contact status detection of a railway signal junction box, which can resolve issues such as reduced fastening force, intermittent contact failure, deterioration of contact status due to accumulated vibration, and inefficiency of field inspection that may occur at the block terminals of a railway signal junction box, by combining a position change of the main body of the pressing plate, protrusion of the lateral indicator, temporary pressure application of the auxiliary pressing part, vibration recording of the gear recording wheel, and a field verification structure of the search bar module. means of solving the problem

[0025] A monitoring and maintenance system based on contact state detection of a railway signal junction box according to the present invention comprises: a junction box main body installed at a railway signal site; a plurality of block terminals arranged inside the junction box main body and each having a cable insertion part into which a cable conductor is inserted; a lower terminal metal part disposed in the cable insertion part of each block terminal and in contact with the cable conductor; a fastening bolt and a pressing plate main body disposed in each block terminal and pressing the cable conductor toward the lower terminal metal part; a contact state detection unit that detects a contact state between the cable conductor and the lower terminal metal part based on a change in the position of the pressing plate main body according to a change in the pressing force by the fastening bolt; a control unit that collects terminal-specific status information output from the contact state detection unit; and an information transmission unit that transmits the terminal-specific status information collected by the control unit to an external maintenance system.

[0026] Next, the block terminal may include a terminal body in which the cable insertion part, the lower terminal metal part, the fastening bolt, and the pressing plate body are arranged. The cable conductor may first enter through the front surface of the terminal body and be inserted into the cable insertion part in a direction toward the rear surface of the terminal body. The fastening bolt may be coupled so as to be screw-movable downward from the upper surface of the terminal body toward the cable insertion part. The lower terminal metal part may be arranged along the lower bottom surface of the cable insertion part on the lower side of the terminal body and may come into contact with the lower surface of the cable conductor. The pressing plate body has an upper pressing surface facing the lower end of the fastening bolt and a lower pressing surface facing the upper surface of the cable conductor, and can press the cable conductor toward the lower terminal metal part with the lower pressing surface while moving downward due to the lowering of the fastening bolt, thereby pressing the cable conductor against the lower terminal metal part. The above block terminal may be formed on the side of the press plate guide housing, which is arranged along the outer side of the press plate body so that the press plate body moves up and down along the pressing direction of the fastening bolt and the opposite direction.When the above-mentioned pressing plate body is in a normal pressing position where it presses the cable conductor toward the lower terminal metal part, a side restraining wall facing the side of the above-mentioned pressing plate body, a pressing plate return elastic piece disposed between the above-mentioned pressing plate body and the terminal body or between the above-mentioned pressing plate body and the pressing plate guide housing to push the above-mentioned pressing plate body in an upward direction opposite to the pressing direction of the fastening bolt, a display piece receiving groove formed on the side of the above-mentioned pressing plate body and laterally open toward the side restraining wall, a lateral display piece inserted into the display piece receiving groove and disposed to protrude laterally outward from the display piece receiving groove of the terminal body, a display piece elastic piece disposed between the inner wall of the display piece receiving groove and the lateral display piece to push the lateral display piece laterally outward from the terminal body, and may be formed on the side of the above-mentioned pressing plate guide housing or the side of the terminal body. When the above-mentioned pressing plate body rises upward from the above-mentioned normal pressing position, it may include a display guide window positioned to face the display receiving groove laterally. The contact state detection unit may be positioned outside the display guide window or facing the display guide window to detect the state in which the lateral display is protruding through the display guide window. The protruding state of the lateral display can be output to the control unit. When the fastening bolt is in a normally fastened state, the lower end of the fastening bolt presses the upper pressing surface of the above-mentioned pressing plate body downward, and the lower pressing surface of the above-mentioned pressing plate body presses the upper surface of the cable conductor toward the lower terminal metal part, and the cable conductor may be compressed between the lower pressing surface of the above-mentioned pressing plate body and the lower terminal metal part.The lateral indicator receives a force that attempts to protrude laterally outward from the indicator receiving groove by the indicator elastic member, but as the outer opening of the indicator receiving groove is positioned to face the side restraining wall, it can be maintained in a state inserted inside the indicator receiving groove by the side restraining wall. When the fastening bolt is loosened due to train vibration, repeated inspection, temperature changes, or a decrease in fastening force, the downward pressure exerted by the fastening bolt may be reduced. The pressing plate return elastic member raises the pressing plate body upward, and due to the raising of the pressing plate body, the outer opening of the indicator receiving groove can move away from the position facing the side restraining wall and move to a position facing the indicator guide window. The indicator elastic member pushes the lateral indicator from the indicator receiving groove toward the indicator guide window, and the lateral indicator can protrude laterally outward from the terminal body through the indicator guide window. The above contact state detection unit is characterized by detecting the protruding state of the lateral indicator as a state of reduced compression force of the cable conductor due to the rise of the pressing plate body.

[0027] Next, the pressing plate body may include a first receiving space formed on one side of the lower pressing surface and open downward toward the cable conductor, a first auxiliary pressing part movably received in the first receiving space, a first auxiliary elastic piece disposed between the inner ceiling surface of the first receiving space and the first auxiliary pressing part, a second receiving space formed at a position spaced apart from the first receiving space on the lower pressing surface and open downward toward the cable conductor, a second auxiliary pressing part movably received in the second receiving space, a second auxiliary elastic piece disposed between the inner ceiling surface of the second receiving space and the second auxiliary pressing part, and a second auxiliary locking piece that restricts the downward movement of the second auxiliary pressing part to maintain the state in which the second auxiliary pressing part is stored inside the second receiving space. The block terminal may further include a locking piece driving unit that moves the second auxiliary locking piece according to a release signal from the control unit. The above-mentioned locking piece drive unit may include a drive pin or slider connected to the second auxiliary locking piece, and an electromagnet or small actuator that moves the drive pin or slider according to a release signal from the control unit. The first receiving space may be formed in the area of ​​the lower pressing surface of the pressing plate body facing the upper surface of the cable conductor. The lower side may be open so that the first auxiliary pressing part can protrude downward from the lower pressing surface of the pressing plate body toward the cable conductor. When the pressing plate body is positioned in a normal pressing position by the fastening bolt, the first auxiliary pressing part can be received inside the lower pressing surface. When the lower pressing force by the fastening bolt is reduced and the pressing plate body rises upward, a passage may be provided for the first auxiliary pressing part to move downward toward the cable conductor.The first auxiliary pressing part has a short downward protruding surface that protrudes toward the cable conductor through the downward opening of the first receiving space, and the short downward protruding surface may be positioned to come down to a lower pressure surface of the pressing plate body and press a portion of the upper surface of the cable conductor. The downward protrusion distance of the first auxiliary pressing part may be formed to provide a minimum temporary contact pressure to delay the immediate loss of contact between the cable conductor and the lower terminal metal part. The first auxiliary elastic piece may be received in a compressed or folded state within the first receiving space when the fastening bolt is properly tightened and the pressing plate body is sufficiently pressed downward. When the fastening bolt is loosened, a gap may be formed between the lower end of the fastening bolt and the upper pressure surface of the pressing plate body. When a clearance space is secured within the first receiving space in which the first auxiliary elastic piece can expand due to the upward movement of the pressing plate body, the first auxiliary elastic piece may elastically expand using the clearance space. Due to the elastic expansion of the first auxiliary elastic piece, the first auxiliary pressing part may protrude downward by a short distance from the lower pressing surface of the pressing plate body toward the cable conductor. Even if the lateral indicator piece is not sufficiently protruded due to dust, friction, component jamming, or interference with the indicator guide window, the first auxiliary pressing part may be operated by the elastic expansion of the first auxiliary elastic piece when the pressing plate body rises due to the reduction of the lower pressing force by the fastening bolt. By applying a weak temporary pressure to the cable conductor toward the lower terminal metal part, the cable conductor may be delayed from immediately detaching from the lower terminal metal part. The second receiving space may be formed on the lower pressing surface of the pressing plate body parallel to the first receiving space or spaced apart in the front-rear direction.When the second auxiliary pressing part is housed by the second auxiliary locking piece, the second auxiliary pressing part can be maintained inside the pressing plate body. When the restraint of the second auxiliary locking piece is released, a passage can be provided through which the second auxiliary pressing part can protrude downward toward the cable conductor. The second auxiliary pressing part has a long downward protruding surface that protrudes toward the cable conductor through the downward opening of the second receiving space. The long downward protruding surface may be positioned to descend to a lower position than the short downward protruding surface of the first auxiliary pressing part so as to additionally press the upper surface of the cable conductor. The downward protrusion distance of the second auxiliary pressing part may be formed as a distance to additionally temporarily maintain contact between the cable conductor and the lower terminal metal part after the lateral indicator piece has protruded and the contact abnormality has become identifiable from the outside. The second auxiliary locking piece may be movably positioned between a locking position that restricts the downward movement of the second auxiliary pressing part while the second auxiliary pressing part is housed inside the second receiving space, and a release position that allows the downward movement of the second auxiliary pressing part. The contact state detection unit may detect the state in which the lateral indicator is protruding through the indicator guide window and output it to the control unit. When the control unit receives input of the protruding state of the lateral indicator from the contact state detection unit, it may determine that the compression force of the cable conductor has decreased. A release signal to release the second auxiliary locking piece may be output to the locking piece driving unit. The locking piece driving unit may move the second auxiliary locking piece from the locking position to the release position according to the release signal to release the restraint on the second auxiliary pressing part. The second auxiliary elastic piece may be housed in a compressed or folded state within the second receiving space while the second auxiliary locking piece is in the locking position.When the second auxiliary locking piece moves to the release position, it can be elastically expanded using the clearance space secured within the second receiving space by the rise of the pressing plate body. Due to the elastic expansion of the second auxiliary elastic piece, the second auxiliary pressing part can protrude downward by a longer distance than the first auxiliary pressing part. The second auxiliary pressing part can additionally apply temporary pressure to the cable conductor toward the lower terminal metal part after the lateral indicator piece protrudes and an abnormality in the contact state of the block terminal is detected by the contact state detection part. The first auxiliary pressing part and the second auxiliary pressing part are characterized as being a temporary contact maintenance configuration intended to delay the immediate loss of electrical contact between the cable conductor and the lower terminal metal part until the fastening bolt is further loosened or a maintenance worker arrives, rather than a configuration that restores the block terminal to a normal state by replacing the normal fastening force of the fastening bolt.

[0028] Next, the block terminal may include a vibration recording lever disposed on one side of the pressing plate body and moving in accordance with the up-and-down reciprocating movement of the pressing plate body, a gear recording wheel engaged with the vibration recording lever and moving stepwise in accordance with the movement of the vibration recording lever, a recording wheel position detection unit that detects the accumulated movement position of the gear recording wheel and outputs it to the control unit, and a second operation detection unit that detects the state in which the second auxiliary pressing unit protrudes downward from the second receiving space and outputs it to the control unit. The vibration recording lever may be disposed adjacent to one side of the pressing plate body. It may include a pressing plate contact end that contacts one side of the pressing plate body and a wheel operating end that engages with the outer teeth of the gear recording wheel. The pressing plate contact end may be disposed to receive the up-and-down movement of the pressing plate body when the pressing plate body moves slightly up-and-down along the direction of pressure of the fastening bolt and the opposite direction due to train vibration. The wheel operating unit may be arranged to sequentially push the outer teeth of the gear recording wheel by the vertical movement of the pressing plate body transmitted to the pressing plate contact unit. The gear recording wheel may be rotatably supported on the side of the terminal body or on the side of the pressing plate guide housing. The wheel operating unit may have a plurality of outer teeth that engage sequentially along the outer circumference. In both cases where the pressing plate body moves slightly up and down due to train vibration while in a normal pressurized position, and where the pressing plate body moves slightly up and down due to train vibration while raised due to reduced clamping force, the movement of the vibration recording lever may be transmitted and the wheel may be moved stepwise. The recording wheel position detection unit may detect the rotational position, movement step, or passing position of the outer teeth of the gear recording wheel and output the cumulative movement position of the gear recording wheel to the control unit.The contact state detection unit can detect the state in which the lateral indicator protrudes through the indicator guide window and output it to the control unit. The second operation detection unit can detect the state in which the second auxiliary pressing part protrudes downward from the second receiving space due to the elastic expansion of the second auxiliary elastic part after the release of the second auxiliary locking part and output it to the control unit. The control unit can store the cumulative movement position of the gear recording wheel input from the recording wheel position detection unit as the accumulated vibration value for each block terminal. The previous maintenance point or the initial position of the gear recording wheel can be stored as the reference position. The gear recording wheel position at the point in time when the protruding state of the lateral indicator is input from the contact state detection unit can be stored as the first reference value. The gear recording wheel position at the point in time when the downward protruding state of the second auxiliary pressing part is input from the second operation detection unit can be stored as the second reference value. The control unit can classify the difference from the reference position to the first reference value as the accumulated vibration value received by the corresponding block terminal before the lateral indicator protrudes. The difference from the first reference value to the second reference value can be classified as the accumulated vibration value received by the corresponding block terminal from the point in time when the lateral indicator protrudes until the second auxiliary press unit is activated. The increase in the gear record wheel after the second reference value can be classified as the accumulated vibration value in a dangerous state received by the corresponding block terminal while in a temporary contact-maintaining state after the second auxiliary press unit is activated. The control unit can store as terminal-specific state information how much vibration is accumulated before the lateral indicator protrudes in a normal pressurized state or an initial fastening force reduction state by utilizing the difference from the reference position to the first reference value.By utilizing the difference between the first reference value and the second reference value, the terminal-specific status information can store the extent to which the second auxiliary press unit is activated after a certain amount of vibration accumulation following the protrusion of the lateral indicator. By utilizing the increment in the cumulative movement position of the gear record wheel after the second reference value, the terminal-specific status information can store the extent to which the corresponding block terminal is exposed to vibration in a dangerous state from the activation of the second auxiliary press unit until maintenance. The indicator guide window may have a width that allows the lateral indicator to protrude laterally. When the lateral indicator protrudes through the indicator guide window and the press plate body moves slightly up and down due to train vibration, the indicator may be formed in the shape of an elongated slot extending in the vertical direction so that the lateral indicator does not catch on the upper or lower edge of the indicator guide window. The information transmission unit is characterized by transmitting at least one of the terminal-specific status information stored in the control unit, the vibration accumulation value for each block terminal, the vibration accumulation value until the lateral indicator protrudes, the vibration accumulation value until the point when the second auxiliary press unit is activated, and the dangerous state vibration accumulation value to the external maintenance system.

[0029] Next, the connection box body comprises: a connection box door that is openably coupled to the front or side of the connection box body to expose to the outside an internal space in which the plurality of block terminals are arranged; a hinge stopper that fixes the connection box door in an open position and releases the fixation when the connection box door rotates further in the opening direction; a plurality of search bar modules arranged to correspond one to the front of each of the plurality of block terminals; a guide cable inserted into a guide mounting groove of the plurality of search bar modules so as to support the plurality of search bar modules so as to be movable along the arrangement direction of the plurality of block terminals; a search bar locking piece that fixes the plurality of search bar modules in a standby position when the connection box door is closed; a door interlocking release piece that releases the fixation of the search bar locking piece when the connection box door is partially opened; a search bar elastic piece that provides elastic force to move each of the plurality of search bar modules in the search direction when the fixation of the search bar locking piece is released; and a batch that is operated by an operator before closing the connection box door after maintenance work to move the plurality of search bar modules in a loading direction opposite to the search direction and reload the plurality of search bar modules in the standby position. It may include a loading bar. The door interlock release piece may be positioned on the inner side of the junction box door or at a location adjacent to the hinge. It may be formed to release the fixation to the plurality of search bar modules by pushing or pulling the search bar locking piece when the junction box door is partially opened.Each of the plurality of search bar modules may include a search bar body formed in a rod shape that is movably arranged along the guide cable and contactable with the lateral indicator, a battery storage unit received inside or on one side of the search bar body to supply power, a light-emitting indicator unit disposed on the outer surface of the search bar body so that an operator can visually check it when the connection box door is open, a first contact switch pressed by the lateral indicator protruding when the search bar body moves in the search direction, a second contact switch pressed by the lateral indicator protruding when the search bar body moves in the loading direction by the batch loading bar, and a guide mounting groove into which the guide cable is inserted. The search bar body may have a central reference line facing the direction in which the lateral indicator protrudes and contacts, and the first contact switch and the second contact switch may be arranged on the central reference line so that they can be operated by being directly pressed by the lateral indicator. The guide mounting groove is formed at an avoidance position spaced apart eccentrically upward or downward from the central reference line, so that the guide cable does not overlap with the protruding path of the lateral indicator and the contact path where the lateral indicator presses the first contact switch or the second contact switch. The first contact switch and the second contact switch may be arranged to face opposite directions relative to the direction of movement of the search bar body, so as to independently detect the press of the lateral indicator approaching from the search direction and the lateral indicator approaching from the loading direction, respectively. When the connection box door is closed, the plurality of search bar modules may be fixed in the standby position by the search bar locking piece. The search bar elastic piece may be maintained in a state storing an elastic force intended to move the plurality of search bar modules in the search direction.When the connection box door is partially opened, the door interlock release piece may not push and move the plurality of search bar modules in proportion to the degree of opening of the connection box door, but rather release the fixation of the search bar locking piece at the moment the connection box door is partially opened. The plurality of search bar modules may move in the search direction by the elastic force of the search bar elastic piece, regardless of the additional opening amount of the connection box door. A search bar module corresponding to a block terminal where the lateral indicator piece is already protruding may have its movement restricted or stopped by coming into contact with the lateral indicator piece while moving in the search direction. The lateral indicator piece presses the first contact switch of the corresponding search bar module, and the search bar module in which the first contact switch is pressed may use the power from the battery storage unit to light up the light-emitting indicator of the corresponding search bar module, thereby indicating the position of the block terminal that was already in an abnormal state immediately after the connection box door is opened. The batch loading bar may be positioned along the guide cable on the loading direction side of the plurality of search bar modules. When an operator operates the connection box door before closing it, the plurality of search bar modules are simultaneously pushed or pulled in the loading direction to move to the waiting position, and when the plurality of search bar modules reach the waiting position, they can be secured again to the search bar locking piece. The search bar module moving in the loading direction by the batch loading bar may come into contact with the newly protruding lateral indicator in the loading direction if a newly protruding lateral indicator exists due to train vibration, a decrease in additional fastening force, or a change in the contact state of another block terminal during maintenance work.The newly protruding lateral indicator presses the second contact switch of the corresponding search bar module, and the search bar module with the second contact switch pressed uses power from the battery storage unit to illuminate the light-emitting indicator of the corresponding search bar module, thereby allowing the operator to check for newly occurring abnormal block terminals during repair work or immediately before closing the junction box door. The hinge stopper fixes the junction box door while it is in an open state, thereby maintaining a workspace where the illuminated state of the plurality of search bar modules and the protruding state of the lateral indicator can be checked. It is characterized by being formed so that when the junction box door is further rotated in the opening direction, the fixation is released, allowing the junction box door to be closed after operating the batch loading bar. Effects of the invention

[0031] According to the present invention, the contact state between a cable conductor and a lower terminal metal part can be detected by utilizing the change in the position of the pressing plate body according to the change in the applied pressure of a fastening bolt at a block terminal inside a junction box installed at a railway signaling site. Accordingly, even when the cable conductor is not outwardly completely detached from the block terminal, the state of reduced compression force due to reduced fastening force can be confirmed as terminal-specific state information.

[0032] In addition, according to the present invention, when the pressing plate body is in a normal pressure position, the lateral indicator is housed inside the indicator receiving groove by the lateral restraint wall, and when the lower pressure of the fastening bolt decreases and the pressing plate body rises, the lateral indicator protrudes to the lateral outer side of the terminal body through the indicator guide window. Accordingly, an abnormal contact state of the block terminal can be indicated in a mechanical protrusion state linked to the position change of the pressing plate body.

[0033] In addition, according to the present invention, a contact state detection unit detects the protrusion state of a lateral display piece at an outer side of the display piece guide window or at a position facing the display piece guide window, and a control unit can collect this as terminal-specific state information. Accordingly, it is possible to distinguish and manage which block terminal among a plurality of block terminals has a contact state abnormality.

[0034] In addition, according to the present invention, when the lower pressing force of the fastening bolt decreases and the pressing plate body rises, the first auxiliary pressing part protrudes downward by a short distance toward the cable conductor due to the elastic expansion of the first auxiliary elastic piece. Accordingly, even if the lateral indicator piece does not protrude sufficiently due to dust, friction, component jamming, or interference with the indicator piece guide window, the first auxiliary pressing part can temporarily press the cable conductor toward the lower terminal metal part to delay the immediate loss of electrical contact.

[0035] In addition, according to the present invention, when the protruding state of the lateral indicator is detected by the contact state detection unit, the control unit outputs a release signal to the locking piece driving unit, and the locking piece driving unit moves the second auxiliary locking piece from the locked position to the released position. Accordingly, the second auxiliary elastic piece is elastically expanded, and the second auxiliary pressing part protrudes downward by a longer distance than the first auxiliary pressing part, thereby allowing the cable conductor to be additionally temporarily pressed.

[0036] In addition, according to the present invention, the first auxiliary pressing part and the second auxiliary pressing part may function as a temporary contact-maintaining configuration that delays the immediate loss of electrical contact between the cable conductor and the lower terminal metal part until the fastening bolt is further loosened or a maintenance worker arrives, rather than a configuration that restores the block terminal to a normal state by replacing the normal fastening force of the fastening bolt. Accordingly, it is possible to mitigate the rapid deterioration of the contact state after an abnormal contact state is detected and before maintenance measures are taken.

[0037] In addition, according to the present invention, the up-and-down reciprocating movement of the pressing plate body is transmitted to the gear recording wheel through the vibration recording lever, and the accumulated movement position of the gear recording wheel is output to the control unit through the recording wheel position detection unit. Accordingly, the accumulated state of the up-and-down fine movement received by the pressing plate body due to train vibration for each block terminal can be managed as a vibration accumulation value.

[0038] In addition, according to the present invention, the control unit stores the initial position of the gear record wheel or the previous maintenance point as a reference position, stores the position of the gear record wheel at the point in time when the protrusion state of the lateral indicator is input as a first reference value, and stores the position of the gear record wheel at the point in time when the downward protrusion state of the second auxiliary presser is input as a second reference value. Accordingly, the accumulated vibration value before the lateral indicator protrudes, the accumulated vibration value from the point in time when the lateral indicator protrudes until the second auxiliary presser is activated, and the accumulated vibration value in a dangerous state after the second auxiliary presser is activated can be distinguished and managed as terminal-specific status information.

[0039] In addition, according to the present invention, the indicator guide window is formed in the shape of an elongated slot extending in the vertical direction. Accordingly, even when the lateral indicator protrudes through the indicator guide window, it is possible to prevent the lateral indicator from catching on the upper or lower edge of the indicator guide window when the main body of the pressing plate moves slightly in the up and down direction due to train vibration.

[0040] In addition, according to the present invention, when the junction box door is partially opened, the door interlocking release piece releases the fixation of the search bar locking piece, and a plurality of search bar modules move in the search direction by the elastic force of the search bar elastic piece. At this time, the already protruding lateral indicator piece presses the first contact switch of the corresponding search bar module, and the light-emitting indicator of the corresponding search bar module lights up. Accordingly, immediately after opening the junction box door, a maintenance worker can visually check the location of the block terminal that was already in an abnormal state among the plurality of block terminals.

[0041] In addition, according to the present invention, when a worker operates the batch loading bar before closing the junction box door after maintenance work, a plurality of search bar modules move in the loading direction. At this time, if a newly protruding lateral indicator exists during the maintenance work or immediately before closing, the lateral indicator presses the second contact switch of the search bar module and illuminates the light-emitting indicator. Accordingly, the worker can additionally check for newly occurring abnormal block terminals before closing the junction box door.

[0042] In addition, according to the present invention, the information transmission unit can transmit at least one of the terminal-specific status information stored in the control unit, the vibration accumulation value per block terminal, the vibration accumulation value until the lateral indicator protrudes, the vibration accumulation value until the point when the second auxiliary press unit is activated, and the dangerous state vibration accumulation value to an external maintenance system. Accordingly, the contact status and vibration exposure status of each block terminal inside the railway signal junction box can be checked by the external maintenance system. Brief explanation of the drawing

[0044] FIG. 1 is an overall configuration block diagram of the contact status detection-based monitoring and maintenance system of the railway signal junction box of the present invention. Figure 2 is a conceptual diagram showing the normal connection state of a contact state detection structure provided in a block terminal. FIG. 3 is a conceptual diagram showing the step-by-step operation state of the first auxiliary pressing part and the second auxiliary pressing part. Figure 4 shows the operation sequence and control block diagram of the auxiliary pressing part of Figure 3. Figure 5 shows a block diagram of contact state stage classification using the vibration accumulation value of a gear record wheel. Figure 6 shows a conceptual diagram of the abnormal terminal detection structure in the open state of the junction box door. Figure 7 shows a block diagram of maintenance verification using the search bar module of Figure 6. Specific details for implementing the invention

[0045] Hereinafter, embodiments are described in detail with reference to the attached drawings. However, since various modifications may be made to the embodiments, the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments are included within the scope of the rights.

[0046] Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosed forms, and the scope of this specification includes modifications, equivalents, or substitutions that fall within the technical concept.

[0047] Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component.

[0048] When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between.

[0049] The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0050] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments pertain. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0051] In addition, when describing with reference to the attached drawings, identical components are assigned the same reference numeral regardless of drawing symbols, and redundant descriptions thereof are omitted. In describing the embodiments, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the embodiments, such detailed description is omitted.

[0052] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0053] In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the embodiments of the present invention.

[0054] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and therefore the present invention is not limited to the depicted details. Furthermore, in describing the present invention, if it is determined that a detailed description of related known technology may unnecessarily obscure the essence of the present invention, such detailed description is omitted. Where terms such as "includes," "has," or "is made up" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it includes cases where it includes the plural unless specifically stated otherwise.

[0055] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0056] In the case of describing a positional relationship, for example, when the positional relationship between two parts is described using expressions such as 'on,' 'upper,' 'lower,' or 'next to,' one or more other parts may be located between the two parts unless 'immediately' or 'directly' is used.

[0057] When elements or layers are referred to as "on" another element or layer, this includes cases where another layer or element is placed directly on top of or in between. Throughout the specification, the same reference numerals refer to the same components.

[0058] The size and thickness of each component shown in the drawings are illustrated for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the illustrated components.

[0059] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and as will be fully understood by those skilled in the art, various technical interlocking and operation are possible, and each embodiment may be implemented independently of one another or together in an interlocking relationship.

[0060] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0061] FIG. 1 is an overall configuration block diagram of the contact status detection-based monitoring and maintenance system of the railway signal junction box of the present invention.

[0062] Figure 2 is a conceptual diagram showing the normal connection state of a contact state detection structure provided in a block terminal.

[0063] FIG. 3 is a conceptual diagram showing the step-by-step operation state of the first auxiliary pressing part and the second auxiliary pressing part.

[0064] Figure 4 shows the operation sequence and control block diagram of the auxiliary pressing part of Figure 3.

[0065] Figure 5 shows a block diagram of contact state stage classification using the vibration accumulation value of a gear record wheel.

[0066] Figure 6 shows a conceptual diagram of the abnormal terminal detection structure in the open state of the junction box door.

[0067] Figure 7 shows a block diagram of maintenance verification using the search bar module of Figure 6.

[0069] In a contact state detection-based monitoring and maintenance system for a railway signal junction box according to the present invention, the system comprises: a junction box main body (100) installed at a railway signal site; a plurality of block terminals (200) arranged inside the junction box main body (100) and each having a cable insertion part (220) into which a cable conductor (230) is inserted; a lower terminal metal part (240) disposed in the cable insertion part (220) of each block terminal (200) and in contact with the cable conductor (230); a fastening bolt (250) disposed in each block terminal (200) and a pressing plate main body (300) that presses the cable conductor (230) toward the lower terminal metal part (240); and a contact state that detects the contact state between the cable conductor (230) and the lower terminal metal part (240) based on a change in the position of the pressing plate main body (300) according to a change in the pressing force by the fastening bolt (250). It is characterized by including a detection unit (730), a control unit (700) that collects terminal-specific status information output from the contact status detection unit (730), and an information transmission unit (710) that transmits the terminal-specific status information collected from the control unit (700) to an external maintenance system (1000).

[0071] Next, the block terminal (200) may include a terminal body (210) on which the cable insertion part (220), the lower terminal metal part (240), the fastening bolt (250), and the pressing plate body (300) are arranged.

[0072] The cable conductor (230) can be inserted into the cable insertion part (220) by first entering through the front surface of the terminal body (210) and then facing the rear surface of the terminal body (210).

[0073] The above fastening bolt (250) can be coupled so as to be screw-movable downward from the upper surface of the terminal body (210) toward the cable insertion part (220).

[0074] The lower terminal metal part (240) is positioned along the lower bottom surface of the cable insertion part (220) on the lower side of the terminal body (210) and can come into contact with the lower surface of the cable conductor (230).

[0075] The above-mentioned pressing plate body (300) has an upper pressing surface (310) facing the lower end of the fastening bolt (250) and a lower pressing surface (320) facing the upper end of the cable conductor (230), and as the fastening bolt (250) moves downward, the cable conductor (230) can be pressed toward the lower terminal metal part (240) with the lower pressing surface (320) to bring the cable conductor (230) into close contact with the lower terminal metal part (240).

[0076] The above block terminal (200) may be formed on the side of the press plate guide housing (340) which is arranged along the outer side of the press plate body (300) so that the press plate body (300) moves up and down along the direction of pressure of the fastening bolt (250) and the opposite direction. A side restraining wall (350) facing the side of the press plate body (300) when the press plate body (300) is in a normal pressing position that presses the cable conductor (230) toward the lower terminal metal part (240); a press plate return elastic piece (360) disposed between the press plate body (300) and the terminal body (210) or between the press plate body (300) and the press plate guide housing (340) to push the press plate body (300) in an upward direction opposite to the pressing direction of the fastening bolt (250); a display piece receiving groove (330) formed on the side of the press plate body (300) and open laterally toward the side restraining wall (350); and a lateral portion inserted into the display piece receiving groove (330) and disposed to protrude laterally from the display piece receiving groove (330) toward the terminal body (210). A display piece (400), a display piece elastic piece (410) disposed between the inner wall of the display piece receiving groove (330) and the lateral display piece (400) to push the lateral display piece (400) to the lateral outer side of the terminal body (210), and may be formed on the side of the press plate guide housing (340) or the terminal body (210). When the press plate body (300) rises upward from the normal pressing position, it may include a display piece guide window (420) disposed to face the display piece receiving groove (330) laterally.

[0077] The above contact state detection unit (730) is positioned on the outside of the display guide window (420) or facing the display guide window (420) to detect the state in which the lateral display (400) protrudes through the display guide window (420). The protruding state of the lateral display (400) can be output to the control unit (700).

[0078] When the above fastening bolt (250) is in a normal fastening state, the lower end of the fastening bolt (250) presses the upper pressure surface (310) of the pressing plate body (300) downward, and the lower pressure surface (320) of the pressing plate body (300) presses the upper surface of the cable conductor (230) toward the lower terminal metal part (240), and the cable conductor (230) can be compressed between the lower pressure surface (320) of the pressing plate body (300) and the lower terminal metal part (240).

[0079] The above lateral indicator (400) receives a force that causes it to protrude laterally outward from the indicator receiving groove (330) by the indicator elastic piece (410), and as the outer opening of the indicator receiving groove (330) is positioned to face the side restraining wall (350), it can be maintained in a state inserted inside the indicator receiving groove (330) by the side restraining wall (350).

[0080] When the above fastening bolt (250) is loosened due to train vibration, repeated inspection, temperature change, or a decrease in fastening force, the downward pressure exerted by the above fastening bolt (250) may be reduced.

[0081] The above-mentioned push plate return elastic piece (360) raises the above-mentioned push plate body (300) upward, and due to the raising of the above-mentioned push plate body (300), the outer opening of the above-mentioned indicator receiving groove (330) can move away from the position facing the side restraint wall (350) and move to a position facing the above-mentioned indicator guide window (420).

[0082] The above-mentioned indicator elastic piece (410) pushes the lateral indicator (400) out of the indicator receiving groove (330) toward the indicator guide window (420), and the lateral indicator (400) can protrude to the lateral outer side of the terminal body (210) through the indicator guide window (420).

[0083] The above contact state detection unit (730) is characterized by detecting the protruding state of the lateral indicator (400) as a state of reduced compression force of the cable conductor (230) due to the rise of the pressing plate body (300).

[0084] In the above embodiment, the junction box body (100) may be installed in the vicinity of the railway track at the railway signal site, at a location adjacent to a signal, at a location adjacent to a switch, in a wiring section related to the track circuit, or at a cable branch point. The junction box body (100) may be formed as a box-shaped outer casing capable of accommodating a plurality of block terminals (200) inside, and may be made of a metal material, an insulatingly coated metal material, or a flame-retardant synthetic resin material. The junction box body (100) may have an openable cover or door to protect the internal connection part from rainwater, dust, moisture, and external impact, and a cable gland, rubber packing, or waterproof fastening part may be placed in the part where the cable is introduced. However, the shape of the junction box body (100) is not limited to a rectangular box shape, and it is sufficient if it is a structure capable of accommodating a railway signal cable connection part and a plurality of block terminals (200).

[0085] The block terminal (200) is a terminal component for electrically connecting the conductor end of a railway signal cable and can be fixed to the inner bottom surface of the connection box body (100), an insulating support, a terminal fixing plate, or a rail-type support. A plurality of block terminals (200) can be arranged in a single line, or arranged in multiple rows as needed. Each block terminal (200) can accommodate different cable conductors (230) and can be arranged with a terminal number, a location mark, or a wiring identification mark so that a maintenance worker can distinguish the terminal location.

[0086] The terminal body (210) is a component that forms the outer shape and reference support of the block terminal (200), and may be formed from an insulating synthetic resin, a ceramic insulating material, an insulating coated metal material, or an equivalent insulating material. The terminal body (210) may have a front surface and a rear surface based on the direction in which the cable conductor (230) first enters. Here, the front surface refers to the side where the cable conductor (230) first enters the interior of the terminal body (210), and the rear surface refers to the inner surface in the direction in which the cable conductor (230) is inserted. Additionally, the side where the fastening bolt (250) is coupled can be viewed as the top surface, and the side where the lower terminal metal part (240) is positioned can be viewed as the bottom surface. These directional expressions are merely a reference for explaining the positional relationship between the components and do not necessarily need to coincide with the direction of gravity in the actual installation state.

[0087] The cable insertion part (220) may be formed as a groove, hole, or passage into which the end of the cable conductor (230) is inserted. The cable insertion part (220) may have side walls to prevent excessive shaking from side to side during the insertion of the cable conductor (230), and may be formed so that a lower terminal metal part (240) is exposed on the lower side. It is preferable that the metal conductor portion of the cable conductor (230) with its sheath removed be inserted into the cable insertion part (220). That is, the block terminal (200) may be configured not to grip and fix the sheath of the cable, but to press the exposed cable conductor (230) toward the lower terminal metal part (240) for electrical connection to make contact.

[0088] The lower terminal metal part (240) is a conductive member that is electrically in contact with the cable conductor (230) and may be formed from copper, brass, phosphor bronze, tin-plated copper, nickel-plated metal, or an equivalent conductive metal material. The lower terminal metal part (240) may be arranged along the lower bottom surface of the cable insertion part (220) and may have an upper surface that contacts the lower surface of the cable conductor (230). The upper surface of the lower terminal metal part (240) may be formed as a flat surface, but may include a gentle uneven surface, a groove, or a conductor seating surface to prevent slippage of the cable conductor (230) or to stably secure the contact area. However, it is preferable that the lower terminal metal part (240) be formed within a range that does not cut or excessively deform the cable conductor (230).

[0089] The above fastening bolt (250) may include a head portion that can be rotated by an operator using a screwdriver, a hex wrench, or a dedicated fastening tool, and a threaded portion that is screwed into the terminal body (210). The terminal body (210) may be provided with a metal insert, a threaded portion, or a bolt guide hole so that the fastening bolt (250) can rotate and screw stably. When the operator tightens the fastening bolt (250), the fastening bolt (250) moves from the upper side to the lower side to press the pressing plate body (300), and when the operator loosens the fastening bolt (250) or the fastening force decreases, the lower pressing force pressing the pressing plate body (300) decreases.

[0090] The above-mentioned pressing plate body (300) is a pressing member interposed between the lower end of the fastening bolt (250) and the cable conductor (230). The above-mentioned pressing plate body (300) can be used to prevent the lower end of the fastening bolt (250) from directly pressing the cable conductor (230) and to transmit the lower pressing force of the fastening bolt (250) to the upper surface of the cable conductor (230) relatively widely. The above-mentioned pressing plate body (300) can be formed of a metal material or an insulating material having rigidity, and a flat surface, a gentle curved surface, or a slip-reducing surface can be formed on the lower pressing surface (320) facing the cable conductor (230) to reduce conductor damage. The upper pressing surface (310) is the surface contacted by the lower end of the fastening bolt (250), and the lower pressing surface (320) is the surface facing the upper surface of the cable conductor (230).

[0091] In a normal fastening state, the lower end of the fastening bolt (250) presses the upper pressure surface (310) of the pressing plate body (300) downward, and the pressing plate body (300) presses the cable conductor (230) toward the lower terminal metal part (240) through the lower pressure surface (320). At this time, the cable conductor (230) is compressed between the pressing plate body (300) and the lower terminal metal part (240), and a stable electrical contact state can be achieved with the lower terminal metal part (240). In this embodiment, the normal pressure position refers to the position where the pressing plate body (300) presses the cable conductor (230) against the lower terminal metal part (240) by the downward pressure of the fastening bolt (250).

[0092] The above-described push plate guide housing (340) is configured to guide the direction of movement of the push plate body (300) when the push plate body (300) moves in the direction of pressure applied by the fastening bolt (250) and the opposite direction. The above-described push plate guide housing (340) may be formed integrally with the terminal body (210) or may be coupled inside the terminal body (210) as a separate part. The above-described push plate guide housing (340) may include a guide wall, a guide groove, a sliding surface, or a guide rail that surrounds both sides or the outer surface of the push plate body (300). Accordingly, the push plate body (300) moves in the up-and-down direction according to the rotation of the fastening bolt (250) or the reduction of the fastening force, but may be restricted from shaking or rotating significantly in the left-and-right direction.

[0093] The above-mentioned side restraint wall (350) may be fixedly formed on the side of the press plate guide housing (340) or the terminal body (210). The above-mentioned side restraint wall (350) is a wall portion facing the side of the press plate body (300) in the normal pressing position, and serves to block the outer opening of the indicator receiving groove (330). The above-mentioned side restraint wall (350) restricts the lateral indicator (400) from protruding outward in the normal fastening state, even if the lateral indicator (400) is pushed outward by the indicator elastic piece (410). Therefore, the side restraint wall (350) is not merely an outer wall, but functions as a restraint reference part that determines whether the lateral indicator (400) protrudes according to the height position of the press plate body (300).

[0094] The above-mentioned push plate return elastic piece (360) is an elastic member for moving the push plate body (300) upward when the downward pressure of the fastening bolt (250) is reduced. The above-mentioned push plate return elastic piece (360) may be formed of a coil spring, a leaf spring, a metal elastic piece, an elastic rubber piece, or an equivalent elastic member. In a normal fastening state, the push plate return elastic piece (360) may be maintained in a compressed or elastically deformed state by the downward pressure of the fastening bolt (250). When the fastening bolt (250) is loosened or the fastening force is reduced, the push plate return elastic piece (360) pushes the push plate body (300) upward by means of an elastic restoring force.

[0095] The above-mentioned indicator receiving groove (330) may be composed of a laterally open groove formed on the side of the pressing plate body (300). It is preferable that the above-mentioned indicator receiving groove (330) be formed in a part that moves up and down together with the pressing plate body (300). This is because when the pressing plate body (300) rises, the indicator receiving groove (330) also rises together, moving away from the position facing the side restraining wall (350) and moving to a position facing the indicator guide window (420). The above-mentioned indicator receiving groove (330) may have a depth and length that allow the lateral indicator (400) to move in a straight line, and its inner wall may function as a support surface that supports the indicator elastic piece (410).

[0096] The lateral indicator (400) may be formed as a slider-type member that is received in the indicator receiving groove (330). The lateral indicator (400) may be configured as a rod-shaped, plate-shaped, or protruding shape and may have a length that can protrude laterally outward from the terminal body (210). The outer end of the lateral indicator (400) may be formed to protrude to a position that is easy for a contact state detection part (730) or an operator to check. The lateral indicator (400) may have its edges rounded so that it slides smoothly inside the indicator receiving groove (330), and its outer surface may be formed smooth to reduce snagging caused by dust or foreign matter.

[0097] The above-mentioned indicator elastic member (410) is positioned between the inner wall of the indicator receiving groove (330) and the lateral indicator (400) to provide a force that pushes the lateral indicator (400) outward. The above-mentioned indicator elastic member (410) may be composed of a small coil spring, a leaf spring, or a compression elastic body. Even in a normal fastening state, the indicator elastic member (410) provides a force to push the lateral indicator (400) outward, but at this time, the outward movement of the lateral indicator (400) is restricted by the lateral restraint wall (350). Therefore, the indicator elastic member (410) acts as a driving source that pushes the lateral indicator (400) toward the indicator guide window (420) the moment the restraint of the lateral restraint wall (350) disappears.

[0098] The above-mentioned indicator guide window (420) may be an opening formed on the side of the press plate guide housing (340) or the terminal body (210). The indicator guide window (420) provides a passage through which the lateral indicator (400) can protrude to the lateral outer side of the terminal body (210). In a normal fastening state, the outer opening of the indicator receiving groove (330) may be positioned to face the side restraint wall (350) rather than being aligned with the indicator guide window (420). On the other hand, when the lower pressure of the fastening bolt (250) decreases and the press plate body (300) rises upward, the outer opening of the indicator receiving groove (330) comes to face the indicator guide window (420). In this state, the indicator elastic piece (410) can push the lateral indicator (400) outward through the indicator guide window (420).

[0099] The above contact state detection unit (730) is configured to detect whether the lateral indicator (400) is protruding and may be positioned on the outside of the indicator guide window (420) or facing the indicator guide window (420). The above contact state detection unit (730) may be composed of a micro switch, a limit switch, a proximity sensor, a light sensor, a magnetic sensor, or a contact-type electric switch. For example, the contact state detection unit (730) may detect the protruding state when the lateral indicator (400) protrudes and the switch lever is pressed, and the protruding state may also be detected by blocking the light path or entering the detection area of ​​the magnetic sensor. Such detection methods are not limited to any one method, and any method capable of converting the protruding state of the lateral indicator (400) into an electrical signal may be applied.

[0100] The control unit (700) can collect signals input from a contact state detection unit (730) corresponding to a plurality of block terminals (200) by distinguishing them by terminal. The control unit (700) may be composed of a microcontroller, an industrial control module, a signal processing circuit, a relay circuit, or a field data collection device. The control unit (700) can identify whether the lateral indicator (400) of a specific block terminal (200) is protruding and can generate terminal-specific status information including location or identification information of the corresponding block terminal (200). The information transmission unit (710) may include a wired communication module, a wireless communication module, an optical communication interface, or a field communication network connection unit, and can transmit the terminal-specific status information generated by the control unit (700) to an external maintenance system (1000).

[0101] The above external maintenance system (1000) may be a control server, a maintenance management server, a field worker terminal, a portable inspection device, or a railway signaling facility management system that manages railway signaling facilities. Accordingly, abnormal contact status of each block terminal (200) occurring inside the junction box main body (100) can be detected not only at the junction box site but also at the external maintenance system (1000).

[0102] When the fastening bolt (250) is properly fastened, the pressing plate body (300) is maintained in a normal pressure position, and the cable conductor (230) is pressed against the lower terminal metal part (240). At this time, the lateral indicator (400) receives a force that attempts to protrude outward by the indicator elastic part (410), but since the outer opening of the indicator receiving groove (330) is in a position facing the side restraining wall (350), it is maintained in a state of being housed inside the indicator receiving groove (330) by the side restraining wall (350). Therefore, in the normal fastening state, the lateral indicator (400) does not protrude through the indicator guide window (420), and the contact state detection part (730) can recognize the corresponding block terminal (200) in a non-protruding state.

[0103] If the fastening bolt (250) loosens or the fastening force decreases due to train vibration, repeated inspections, temperature changes, or long-term use, the force with which the fastening bolt (250) presses the pressing plate body (300) downward decreases. In this case, the pressing plate return elastic piece (360) raises the pressing plate body (300) upward, and the indicator receiving groove (330) also moves upward along with the pressing plate body (300). When the outer opening of the indicator receiving groove (330) moves away from the position facing the side restraining wall (350) and reaches the position facing the indicator guide window (420), the restraint that was preventing the outward movement of the lateral indicator (400) is released. Subsequently, the elastic indicator (410) pushes the lateral indicator (400) toward the indicator guide window (420), and the lateral indicator (400) protrudes to the lateral outer side of the terminal body (210) through the indicator guide window (420).

[0104] In this manner, the state in which the lateral indicator (400) is protruding may indicate that the pressing plate body (300) has moved away from the normal pressure position and risen. Since the rise of the pressing plate body (300) may indicate that the compressive force pressing the cable conductor (230) toward the lower terminal metal part (240) has decreased, the contact state detection part (730) may detect the protruding state of the lateral indicator (400) as being above the contact state between the cable conductor (230) and the lower terminal metal part (240). At this time, the present embodiment is configured not only to detect the state in which the cable conductor (230) is completely removed from the block terminal (200), but also to detect the state in which the cable conductor (230) still remains inside the cable insertion part (220) but the compressive force has decreased.

[0105] According to the above embodiment, even without directly measuring the amount of rotation of the fastening bolt (250), an abnormality in the contact state can be confirmed based on the position change of the pressing plate body (300) that is actually pressing the cable conductor (230). In addition, since the lateral indicator (400) is housed in the indicator receiving groove (330) formed in the pressing plate body (300) and moves together with the pressing plate body (300), the position change of the pressing plate body (300) due to the decrease in fastening force can be converted into whether the indicator protrudes. Accordingly, even if a decrease in compression force occurs in a specific block terminal (200) among the multiple block terminals (200) inside the railway signal connection box, an abnormality in the contact state of the corresponding block terminal (200) can be detected on a terminal-by-terminal basis and transmitted to an external maintenance system (1000).

[0108] Next, the pressing plate body (300) comprises a first receiving space (500) formed on one side of the lower pressing surface (320) and open downward toward the cable conductor (230), a first auxiliary pressing part (510) movably received in the first receiving space (500), a first auxiliary elastic piece (520) disposed between the inner ceiling surface of the first receiving space (500) and the first auxiliary pressing part (510), a second receiving space (530) formed at a position spaced apart from the first receiving space (500) on the lower pressing surface (320) and open downward toward the cable conductor (230), a second auxiliary pressing part (540) movably received in the second receiving space (530), and a second auxiliary pressing part disposed between the inner ceiling surface of the second receiving space (530) and the second auxiliary pressing part (540). It may include an elastic piece (550) and a second auxiliary locking piece (560) that restricts the downward movement of the second auxiliary pressing part (540) so as to maintain the state in which the second auxiliary pressing part (540) is stored inside the second receiving space (530).

[0109] The above block terminal (200) may further include a locking piece driving unit (260) that moves the second auxiliary locking piece (560) according to a release signal of the control unit (700).

[0110] The above locking piece driving unit (260) may include a driving pin or slider connected to the second auxiliary locking piece (560), and an electromagnet or small actuator that moves the driving pin or slider according to a release signal from the control unit (700).

[0111] The first receiving space (500) may be formed in the area facing the upper surface of the cable conductor (230) among the lower pressing surfaces (320) of the pressing plate body (300).

[0112] The lower side of the first auxiliary pressing part (510) may be open so that it can protrude downward from the lower pressing surface (320) of the pressing plate body (300) toward the cable conductor (230).

[0113] When the above-mentioned pressing plate body (300) is positioned in a normal pressing position by the above-mentioned fastening bolt (250), the above-mentioned first auxiliary pressing part (510) can be accommodated inside the lower pressing surface (320).

[0114] When the lower pressure from the above fastening bolt (250) is reduced and the above pressing plate body (300) is raised upward, the above first auxiliary pressing part (510) can provide a passage for downward movement toward the cable conductor (230).

[0115] The first auxiliary pressing part (510) has a short downward protruding surface that protrudes toward the cable conductor (230) through the downward opening of the first receiving space (500), and the short downward protruding surface may be positioned to come down to a lower position than the lower pressing surface (320) of the pressing plate body (300) so as to press a part of the upper surface of the cable conductor (230).

[0116] The downward protrusion distance of the first auxiliary pressing part (510) may be formed to a distance that provides a minimum temporary contact pressure to delay the immediate loss of contact between the cable conductor (230) and the lower terminal metal part (240).

[0117] The first auxiliary elastic piece (520) can be received in a compressed or folded state within the first receiving space (500) when the fastening bolt (250) is properly fastened and the pressing plate body (300) is sufficiently pressed downward.

[0118] The above fastening bolt (250) can be loosened to form a gap between the lower end of the fastening bolt (250) and the upper pressing surface (310) of the pressing plate body (300). When a gap space (570) is secured within the first receiving space (500) through which the first auxiliary elastic piece (520) can be expanded by the rising of the pressing plate body (300), the first auxiliary elastic piece (520) can be elastically expanded using the gap space (570).

[0119] Due to the elastic expansion of the first auxiliary elastic piece (520), the first auxiliary pressing part (510) can protrude downward by a short distance from the lower pressing surface (320) of the pressing plate body (300) toward the cable conductor (230).

[0120] The first auxiliary pressing part (510) can be operated by the elastic expansion of the first auxiliary elastic part (520) when the pressing plate body (300) rises due to the reduction of the lower pressure by the fastening bolt (250), even when the lateral indicator (400) is not sufficiently protruded due to dust, friction, part jamming, or interference with the indicator guide window (420).

[0121] The cable conductor (230) can be temporarily and weakly pressed toward the lower terminal metal part (240) to delay the cable conductor (230) from immediately detaching from the lower terminal metal part (240).

[0122] The second receiving space (530) may be formed on the lower pressure surface (320) of the pressing plate body (300) in parallel with the first receiving space (500) or spaced apart in the front and rear directions.

[0123] When the second auxiliary pressing part (540) is stored by the second auxiliary locking piece (560), the second auxiliary pressing part (540) can be maintained inside the pressing plate body (300).

[0124] When the restraint of the second auxiliary locking piece (560) is released, the second auxiliary pressing part (540) can provide a passage through which it can protrude downward toward the cable conductor (230).

[0125] The second auxiliary pressing part (540) has a long downward protruding surface that protrudes toward the cable conductor (230) through the downward opening of the second receiving space (530).

[0126] The long downward protruding surface can be positioned to come down to a lower position than the short downward protruding surface of the first auxiliary pressing part (510) so as to additionally press the upper surface of the cable conductor (230).

[0127] The downward protrusion distance of the second auxiliary pressing part (540) may be formed as a distance to additionally temporarily maintain contact between the cable conductor (230) and the lower terminal metal part (240) after the lateral indicator (400) is protruded and the contact state abnormality becomes identifiable from the outside.

[0128] The second auxiliary locking piece (560) may be movably positioned between a locking position that restricts the downward movement of the second auxiliary pressing part (540) while the second auxiliary pressing part (540) is housed inside the second receiving space (530) and a release position that allows the downward movement of the second auxiliary pressing part (540).

[0129] The above contact state detection unit (730) can detect the state in which the lateral indicator (400) protrudes through the indicator guide window (420) and output it to the control unit (700).

[0130] The control unit (700) can determine the state of reduced compression force of the cable conductor (230) when the protruding state of the lateral indicator (400) is input from the contact state detection unit (730).

[0131] A release signal to release the second auxiliary locking piece (560) can be output to the locking piece driving unit (260).

[0132] The above locking piece driving unit (260) can move the second auxiliary locking piece (560) from the locking position to the release position according to the release signal, thereby releasing the restraint on the second auxiliary pressing unit (540).

[0133] The second auxiliary elastic piece (550) can be received in a compressed or folded state within the second receiving space (530) while the second auxiliary locking piece (560) is in the locking position.

[0134] When the second auxiliary locking piece (560) moves to the release position, it can be elastically expanded using the clearance space (570) secured within the second receiving space (530) by the rise of the pressing plate body (300).

[0135] Due to the elastic expansion of the second auxiliary elastic piece (550), the second auxiliary pressing part (540) can protrude downward by a longer distance than the first auxiliary pressing part (510).

[0136] The second auxiliary pressing part (540) can additionally apply temporary pressure to the cable conductor (230) toward the lower terminal metal part (240) after the lateral indicator (400) is protruded and an abnormality in the contact state of the block terminal (200) is detected by the contact state detection part (730).

[0137] The first auxiliary pressing part (510) and the second auxiliary pressing part (540) are characterized in that they are not configured to restore the block terminal (200) to a normal state by replacing the normal fastening force of the fastening bolt (250), but rather are configured to maintain temporary contact to delay the immediate loss of electrical contact between the cable conductor (230) and the lower terminal metal part (240) until the fastening bolt (250) is further loosened or a maintenance worker arrives.

[0138] In the above embodiment, the first receiving space (500) and the second receiving space (530) are internal spaces formed on the lower pressing surface (320) of the pressing plate body (300), and it is preferable that they be positioned in a location that does not interfere with the basic pressing function of the pressing plate body (300) directly pressing the cable conductor (230). The first receiving space (500) and the second receiving space (530) may each be formed in the shape of a groove or pocket with an open lower side and may be positioned in an area facing the upper surface of the cable conductor (230). The first receiving space (500) and the second receiving space (530) may be arranged side by side in the left-right direction, or they may be spaced apart from each other along the front-back direction in which the cable conductor (230) is inserted. In this case, the first auxiliary pressing part (510) and the second auxiliary pressing part (540) do not press only the same point, but can assist in temporary contact by pressing different locations on the upper surface of the cable conductor (230).

[0139] It is preferable that the first receiving space (500) and the second receiving space (530) be formed within a range that does not excessively weaken the rigidity of the pressing plate body (300). For example, the pressing plate body (300) may be made entirely of metal or a rigid insulating material, and the first receiving space (500) and the second receiving space (530) may be formed as concave spaces created by excavating a portion of the lower pressing surface (320). In this case, the inner ceiling surface of each receiving space may function as a surface supporting an auxiliary elastic piece, and the side wall of each receiving space may function as a guide surface that suppresses shaking from side to side when the auxiliary pressing part moves downward.

[0140] The first auxiliary pressing part (510) may be composed of a small pressing member that can move up and down within the first receiving space (500). The first auxiliary pressing part (510) may be formed in the shape of a rod, a short block, a cylinder, or a pressing pin having a gently protruding surface at the bottom. It is preferable that the bottom of the first auxiliary pressing part (510) have a flat surface, a curved surface, or a gentle edge so as not to scratch or cut the cable conductor (230). The surface of the first auxiliary pressing part (510) that contacts the cable conductor (230) may be narrower than the lower pressing surface (320), but may have a contact area sufficient to apply a fine contact pressure toward the lower terminal metal part (240) by locally pressing the upper surface of the cable conductor (230).

[0141] The first auxiliary elastic piece (520) is an elastic member for pushing the first auxiliary pressing part (510) downward. The first auxiliary elastic piece (520) may be made of a small coil spring, a leaf spring, a bent metal elastic piece, or an elastic rubber body. The first auxiliary elastic piece (520) may be compressed between the inner ceiling surface of the first receiving space (500) and the first auxiliary pressing part (510), and in a normal fastening state, it may maintain a compressed or folded state as the first auxiliary pressing part (510) is housed inside the first receiving space (500) by the pressing force of the fastening bolt (250).

[0142] In the above normal connection state, the lower pressing surface (320) of the pressing plate body (300) sufficiently presses the cable conductor (230) toward the lower terminal metal part (240), so there is no need for the first auxiliary pressing part (510) to press the cable conductor (230) significantly separately. Therefore, the first auxiliary pressing part (510) can be housed so that it hardly protrudes below the lower pressing surface (320) in the normal state, or remains at almost the same height as the lower pressing surface (320). By configuring it in this way, unnecessary local pressure applied by the first auxiliary pressing part (510) to the cable conductor (230) in the normal connection state can be reduced.

[0143] When the fastening force of the above-mentioned fastening bolt (250) decreases, the pressing plate body (300) rises upward, and a clearance space is formed inside the first receiving space (500) in which the first auxiliary elastic piece (520) can be expanded. Here, the clearance space (570) does not simply mean an empty space, but rather refers to a clearance for movement in which the first auxiliary elastic piece (520) can expand using elastic restoring force while in a compressed state. When the first auxiliary elastic piece (520) expands, the first auxiliary pressing part (510) protrudes briefly toward the cable conductor (230) through the downward opening of the first receiving space (500).

[0144] The protrusion of the first auxiliary pressing part (510) does not restore the normal fastening force of the fastening bolt (250), but is a temporary pressing action intended to delay the immediate disconnection of electrical contact between the cable conductor (230) and the lower terminal metal part (240). Therefore, the first auxiliary pressing part (510) can be understood as a configuration that assists in a minimal contact state by gently pressing a part of the cable conductor (230) toward the lower terminal metal part (240), rather than replacing the large-area pressing force provided by the entire pressing plate body (300). Depending on the embodiment, a gentle contact surface may be formed at the bottom of the first auxiliary pressing part (510) to reduce conductor damage.

[0145] It is preferable that the first auxiliary pressing part (510) be configured to operate regardless of whether the lateral indicator (400) protrudes. For example, dust, moisture, corrosive foreign substances, or fine metal dust may enter the junction box of a railway signaling site, and due to these foreign substances, a situation may occur where the lateral indicator (400) cannot protrude sufficiently through the indicator guide window (420). Even in this case, if the pressing force of the fastening bolt (250) is lowered and the pressing plate body (300) rises, the first auxiliary elastic part (520) can cause the first auxiliary pressing part (510) to protrude downward. In this respect, the first auxiliary pressing part (510) functions as a mechanical primary temporary contact maintenance configuration that does not rely on the detection of the indicator protrusion.

[0146] The second receiving space (530) is a space for receiving the second auxiliary pressing part (540) and the second auxiliary elastic piece (550), and can be formed separately from the first receiving space (500). The second receiving space (530) accommodates the second auxiliary pressing part (540) inside the pressing plate body (300) when the second auxiliary pressing part (540) is fixed by the second auxiliary locking piece (560), and guides the second auxiliary pressing part (540) to move downward when the second auxiliary locking piece (560) is released. The side wall of the second receiving space (530) restricts the downward movement path of the second auxiliary pressing part (540), thereby causing the second auxiliary pressing part (540) to protrude in a predetermined direction toward the upper surface of the cable conductor (230).

[0147] The second auxiliary pressing part (540) may be formed to have a longer downward protrusion distance than the first auxiliary pressing part (510). The second auxiliary pressing part (540) may be formed as a rod-shaped, block-shaped, or slider-shaped member having a bottom pressing surface, and may protrude toward the cable conductor (230) by the elastic force of the second auxiliary elastic piece (550). The bottom of the second auxiliary pressing part (540) may have a flat pressing surface or a gentle curved surface to stably press the cable conductor (230). Since the second auxiliary pressing part (540) operates after an abnormal contact state is detected, it can be understood as a configuration that temporarily presses the cable conductor (230) toward the lower terminal metal part (240) more actively than the first auxiliary pressing part (510).

[0148] The second auxiliary elastic piece (550) is an elastic member for protruding the second auxiliary pressing part (540) downward. The second auxiliary elastic piece (550) may be composed of a small coil spring, a leaf spring, a bent metal elastic piece, or an elastic body. While the second auxiliary locking piece (560) is in a locked position, the second auxiliary elastic piece (550) is received inside the second receiving space (530) in a compressed or folded state. In this state, even if the second auxiliary elastic piece (550) attempts to expand downward, the second auxiliary locking piece (560) restricts the downward movement of the second auxiliary pressing part (540), so the second auxiliary pressing part (540) does not protrude.

[0149] The second auxiliary locking piece (560) is a member that selectively restricts the downward movement of the second auxiliary pressing part (540). The second auxiliary locking piece (560) may be formed in the form of a locking projection, a slide lock, a pivotable locking piece, an elastic latch, or a fixing pin that can move laterally. When the second auxiliary locking piece (560) is in the locking position, it engages with the side, top, or locking projection of the second auxiliary pressing part (540) to prevent the second auxiliary pressing part (540) from moving downward. When the second auxiliary locking piece (560) moves to the release position, the movement path of the second auxiliary pressing part (540) opens, and the second auxiliary elastic piece (550) can push the second auxiliary pressing part (540) downward by means of an elastic restoring force.

[0150] The locking piece driving unit (260) is a driving configuration that moves the second auxiliary locking piece (560) according to a release signal from the control unit (700). The locking piece driving unit (260) may include a driving pin or a slider connected to the second auxiliary locking piece (560), and the driving pin or slider may be moved by an electromagnet, a solenoid, a small linear actuator, or a small rotary actuator. For example, when the electromagnet is energized, the driving pin is pulled by magnetic force, and the second auxiliary locking piece (560) connected to the driving pin may move from a locked position to a released position. In another embodiment, a small actuator may move the slider in a straight line to push the second auxiliary locking piece (560) to the side.

[0151] The above locking piece driving unit (260) can be electrically connected to a control unit (700) inside the connection box and can be configured to operate only when a release signal from the control unit (700) is input. Accordingly, the second auxiliary pressing unit (540) does not immediately protrude simply because the pressing plate body (300) has risen, but operates after the contact state detection unit (730) detects the protruding state of the lateral indicator piece (400) and the control unit (700) determines that the compression force has decreased. This configuration is intended to reduce unnecessary operation of the second auxiliary pressing unit (540) and to ensure that additional temporary pressure is applied after an abnormality in the contact state is confirmed.

[0152] When the contact state detection unit (730) detects the protruding state of the lateral indicator (400), the control unit (700) can determine that the pressing plate body (300) has moved away from the normal pressure position at the corresponding block terminal (200). At this time, the control unit (700) can process the reduced compression force between the cable conductor (230) and the lower terminal metal part (240) as terminal-specific state information, and simultaneously output a release signal to the locking plate driving unit (260). The release signal may be an electrical signal that drives an electromagnet or a small actuator for a certain period of time, and may be provided as a single signal or a maintenance signal depending on the settings of the maintenance system.

[0153] When the locking piece driving unit (260) operates according to a release signal, the second auxiliary locking piece (560) moves from a locked position to a released position. When the second auxiliary locking piece (560) moves to the released position, the restraint preventing the downward movement of the second auxiliary pressing unit (540) is released, and the second auxiliary elastic piece (550) elastically expands using the clearance space (570) secured inside the second receiving space (530). As a result, the second auxiliary pressing unit (540) protrudes toward the cable conductor (230) through the downward opening of the second receiving space (530).

[0154] Since the second auxiliary pressing part (540) protrudes downward by a longer distance than the first auxiliary pressing part (510), it can apply an additional temporary contact pressure greater than the primary temporary contact pressure provided by the first auxiliary pressing part (510) to the cable conductor (230). However, the second auxiliary pressing part (540) is also not configured to restore the normal fastening force of the fastening bolt (250). The second auxiliary pressing part (540) should be understood as an auxiliary configuration to delay the cable conductor (230) from immediately detaching from the lower terminal metal part (240) until a maintenance worker arrives at the site or takes action after an abnormality in the contact state is detected.

[0155] The first auxiliary pressing part (510) and the second auxiliary pressing part (540) have different operating conditions and protrusion lengths. The first auxiliary pressing part (510) operates mechanically first due to a decrease in fastening force and the rise of the pressing plate body (300), and the second auxiliary pressing part (540) operates subsequently according to the detection of the protrusion of the lateral indicator (400) and the release signal of the control unit (700). Accordingly, the first auxiliary pressing part (510) serves to provide minimal temporary contact even in situations of malfunction or detection delay of the indicator, and the second auxiliary pressing part (540) serves to secure contact maintenance time by additionally pressing the cable conductor (230) after an abnormality in the contact state is confirmed.

[0156] In the process where the first auxiliary pressing part (510) and the second auxiliary pressing part (540) press the cable conductor (230), the cable conductor (230) is pressed toward the lower terminal metal part (240). At this time, the lower contact surface of each auxiliary pressing part may be formed gently so as not to cause excessive local deformation of the cable conductor (230). In addition, it is preferable that each auxiliary pressing part operates in a manner that temporarily assists contact with the lower terminal metal part (240) by pressing the upper surface of the cable conductor (230), rather than by cutting or penetrating the cable conductor (230).

[0157] According to the present embodiment, even when the fastening force of the fastening bolt (250) is reduced, the first auxiliary pressing part (510) may protrude briefly first to delay the immediate loss of contact of the cable conductor (230), and subsequently, when the protrusion of the lateral indicator (400) is detected, the second auxiliary pressing part (540) may protrude further to provide additional temporary contact. This two-stage temporary contact maintenance structure is not a means to restore the block terminal (200) to a normal state, but an auxiliary structure to delay the deterioration of the contact state until a maintenance worker actually retightens the fastening bolt (250) or checks the cable connection state.

[0158] In the above embodiment, since the first auxiliary elastic member (520) and the second auxiliary elastic member (550) can be maintained in a compressed state for a long period, it is preferable that they be composed of a metal spring or a durable elastic member suitable for repeated compression and restoration. Additionally, within the first receiving space (500) and the second receiving space (530), a surface treatment to reduce friction, guide ribs, or foreign matter discharge grooves may be formed to allow the auxiliary pressing part to move smoothly. However, these detailed configurations are exemplary configurations to assist in the smooth movement of the auxiliary pressing part, and the basic operating principle of this embodiment lies in the mechanical protrusion of the first auxiliary pressing part (510) following the rise of the pressing plate body (300) and the subsequent protrusion of the second auxiliary pressing part (540) following the release signal of the control unit (700).

[0160] Next, the block terminal (200) may include a vibration recording lever (600) disposed on one side of the pressing plate body (300) and moving according to the up-and-down reciprocating movement of the pressing plate body (300), a gear recording wheel (630) engaged with the vibration recording lever (600) and moving stepwise according to the movement of the vibration recording lever (600), a recording wheel position detection unit (650) that detects the cumulative movement position of the gear recording wheel (630) and outputs it to the control unit (700), and a second operation detection unit (660) that detects the state in which the second auxiliary pressing unit (540) protrudes downward from the second receiving space (530) and outputs it to the control unit (700).

[0161] The above vibration recording lever (600) may be positioned adjacent to one side of the above pressing plate body (300).

[0162] It may include a press plate contact portion (610) that contacts one side of the press plate body (300) and a wheel operating portion (620) that engages with the outer teeth (640) of the gear recording wheel (630).

[0163] The above-mentioned pressing plate contact portion (610) may be arranged to receive the vertical movement of the pressing plate body (300) when the pressing plate body (300) moves back and forth slightly in the vertical direction along the pressing direction of the fastening bolt (250) and the opposite direction due to train vibration.

[0164] The wheel operating section (620) may be arranged to sequentially push the outer teeth (640) of the gear recording wheel (630) by the vertical movement of the pressing plate body (300) transmitted to the pressing plate contact section (610).

[0165] The above gear recording wheel (630) can be rotatably supported on the side of the terminal body (210) or on the side of the press plate guide housing (340).

[0166] The wheel operating section (620) may have a plurality of outer teeth (640) that engage sequentially along the outer circumference.

[0167] In both cases, when the above-mentioned pressing plate body (300) moves up and down slightly due to train vibration while in a normal pressure position, and when the above-mentioned pressing plate body (300) moves up and down slightly due to train vibration while in a raised state due to reduced fastening force, the movement of the above-mentioned vibration recording lever (600) can be transmitted and moved step by step.

[0168] The above-mentioned recording wheel position detection unit (650) can detect the rotational position, movement step, or passing position of the above-mentioned gear (630) and output the cumulative movement position of the above-mentioned gear recording wheel (630) to the control unit (700).

[0169] The above contact state detection unit (730) can detect the state in which the lateral indicator (400) protrudes through the indicator guide window (420) and output it to the control unit (700).

[0170] The second operation detection unit (660) can detect the state in which the second auxiliary pressing unit (540) protrudes downward from the second receiving space (530) due to the elastic expansion of the second auxiliary elastic unit (550) after the release of the second auxiliary locking unit (560), and output this to the control unit (700).

[0171] The control unit (700) can store the accumulated movement position of the gear recording wheel (630), which is input from the recording wheel position detection unit (650), as an accumulated vibration value for each block terminal (200).

[0172] The previous maintenance point or the initial position of the gear record wheel (630) can be saved as the reference position.

[0173] The position of the gear record wheel (630) at the time when the protrusion state of the lateral indicator (400) is input in the contact state detection unit (730) can be stored as a first reference value.

[0174] The position of the gear record wheel (630) at the time when the downward protrusion state of the second auxiliary pressing part (540) is input in the second operation detection part (660) can be stored as a second reference value.

[0175] The control unit (700) can distinguish the difference from the reference position to the first reference value as the accumulated vibration value received by the corresponding block terminal (200) before the lateral indicator (400) protrudes.

[0176] The difference from the first reference value to the second reference value can be distinguished as the accumulated vibration value received by the corresponding block terminal (200) from the point in time when the second auxiliary pressing part (540) is activated after the lateral indicator (400) is protruded.

[0177] The increase in the gear record wheel (630) after the second reference value can be classified as the accumulated value of the dangerous state vibration received by the corresponding block terminal (200) while in a temporary contact-maintained state after the second auxiliary pressing part (540) is operated.

[0178] The control unit (700) can store as terminal-specific state information whether the lateral indicator (400) protrudes after a certain amount of vibration accumulation in a normal pressurized state or an initial reduced fastening force state, using the difference from the reference position to the first reference value.

[0179] By utilizing the difference between the first reference value and the second reference value, the terminal-specific status information can be stored regarding how much vibration accumulation after the lateral indicator (400) protrudes and the second auxiliary pressing part (540) is activated.

[0180] By utilizing the cumulative movement position increment of the gear record wheel (630) after the second reference value, the degree to which the corresponding block terminal (200) is exposed to vibration in a dangerous state from the time the second auxiliary pressing part (540) is operated until maintenance can be stored as terminal-specific status information.

[0181] The above-mentioned indicator guide window (420) may have a width that allows the above-mentioned lateral indicator (400) to protrude laterally.

[0182] The lateral indicator (400) may be formed in the shape of an elongated slot extending in the vertical direction so that when the press plate body (300) moves slightly up and down due to train vibration while the lateral indicator (400) is protruding through the indicator guide window (420), the lateral indicator (400) does not get caught on the upper or lower edge of the indicator guide window (420).

[0183] The information transmission unit (710) is characterized by transmitting at least one of the terminal-specific status information stored in the control unit (700), the vibration accumulation value for each block terminal (200), the vibration accumulation value until the lateral indicator (400) protrudes, the vibration accumulation value until the point when the second auxiliary pressing unit (540) is activated, and the dangerous state vibration accumulation value to the external maintenance system (1000).

[0184] In the above embodiment, the vibration recording lever (600), the gear recording wheel (630), and the recording wheel position detection unit (650) are configured to record the extent to which the block terminal (200) has accumulated repetitive vibrations due to train operation as a change in mechanical position. Here, the accumulated vibration value is not limited to a value obtained by precisely measuring the actual physical quantity of train vibration, but may refer to the number of times the pressing plate body (300) has repeatedly moved in the up-and-down direction or the degree to which the gear recording wheel (630) has moved stepwise in response. Therefore, the vibration recording structure of this embodiment can be understood not as a method of measuring railway vibration solely with a separate high-precision vibration sensor, but as a method of recording mechanical history related to changes in contact state by utilizing the minute movement of the pressing plate body (300) that is actually pressing the cable conductor (230) inside the block terminal (200).

[0185] The vibration recording lever (600) may be composed of a thin rod-shaped, bent-shaped, or pivotable member positioned adjacent to one side of the pressing plate body (300). The vibration recording lever (600) may be made of a metal plate, an elastic metal piece, a wear-resistant synthetic resin, or a metal material with an insulating coating. The vibration recording lever (600) may be configured to translate in exactly the same way as the up-and-down movement of the pressing plate body (300), or it may be configured to rotate like a lever with one end in contact with the pressing plate body (300) and the other end positioned toward the toothed recording wheel (630). In this case, the vibration recording lever (600) may be rotatably supported by a support projection, pin, shaft, or groove formed on the side of the terminal body (210) or the pressing plate guide housing (340).

[0186] The above-mentioned pressing plate contact portion (610) is a part that contacts one side of the pressing plate body (300) of the vibration recording lever (600). The above-mentioned pressing plate contact portion (610) may be positioned in a state of light contact with the side of the pressing plate body (300) so as not to miss the minute up-and-down movement of the pressing plate body (300). The above-mentioned pressing plate contact portion (610) may have a rounded end, a gentle curved surface, or a small roller-shaped contact portion to reduce wear caused by friction. However, it is not necessary to include a rotating roller, and any contact shape capable of transmitting the up-and-down movement of the pressing plate body (300) to the vibration recording lever (600) is sufficient.

[0187] The wheel operating portion (620) is a part that engages with the outer teeth (640) of the gear recording wheel (630) of the vibration recording lever (600). The wheel operating portion (620) may be formed in the shape of a pointed hook, an inclined projection, a leaf spring end, or a thin hook that can be caught between the outer teeth (640). The wheel operating portion (620) may be positioned to push one of the outer teeth (640) of the gear recording wheel (630) to move the gear recording wheel (630) one step at a time whenever the pressing plate body (300) reciprocates slightly in the up and down direction. At this time, to prevent the gear recording wheel (630) from rotating excessively fast, the wheel operating portion (620) may have elastic clearance to push the outer teeth (640) when there is a slight movement of the pressing plate body (300) of a certain size or larger.

[0188] The above-mentioned gear recording wheel (630) may be a rotating member having a plurality of outer teeth (640) formed on its outer circumference. The above-mentioned gear recording wheel (630) may be composed of a disc-shaped, ratchet-wheel-shaped, or small gear-shaped member having teeth formed at regular intervals on its outer circumference. The above-mentioned gear recording wheel (630) may be rotatably supported on the side of the terminal body (210) or the side of the push plate guide housing (340), and may be supported by a rotation shaft, a center pin, a bushing, or a small bearing. The above-mentioned gear recording wheel (630) does not necessarily need to transmit a large rotational force like a power transmission gear, but functions as a recording member whose position changes stepwise according to the repeated operation of the vibration recording lever (600).

[0189] The outer teeth (640) may be formed on the outer circumference of the gear recording wheel (630) so that the wheel operating section (620) can be engaged sequentially. The outer teeth (640) may have an inclined surface that is easily pushed in one direction and a locking surface that prevents easy return in the reverse direction. However, the reverse movement prevention structure is not necessarily limited to the essential components of the claim, and depending on the embodiment, friction resistance, a small elastic locking piece, a rotational resistance member, or a magnetic position maintaining member may be applied as auxiliary components to prevent the position of the gear recording wheel (630) from easily returning. These auxiliary components are merely examples to maintain the recording position of the gear recording wheel (630).

[0190] The combined relationship between the vibration recording lever (600) and the gear recording wheel (630) is significant in that it allows the fine up-and-down movement of the pressing plate body (300) to be converted into the stepwise movement of the gear recording wheel (630). For example, when a train passes, if repetitive vibration is transmitted to the connection box body (100) and the block terminal (200), the fastening bolt (250) and the pressing plate body (300) may also shake slightly. At this time, if the pressing plate body (300) reciprocates within a very small range in the direction of pressure of the fastening bolt (250) and the opposite direction, the pressing plate contact end (610) receives that movement and rotates or displaces the vibration recording lever (600), and the wheel operating end (620) pushes the outer gear (640) to move the position of the gear recording wheel (630) by one step. When this process is repeated, the accumulated movement position of the gear recording wheel (630) can be used as a mechanical record value indicating how much the corresponding block terminal (200) has received from repeated vibration.

[0191] The above-mentioned gear recording wheel (630) can operate even when the pressing plate body (300) is in a normal pressure position. That is, this embodiment does not record only vibrations after an abnormal contact state occurs, but can also accumulate movement when the block terminal (200) repeatedly receives train vibrations even in a normal pressure state. Subsequently, even when the pressing plate body (300) is in a raised state due to a decrease in fastening force, if the pressing plate body (300) moves slightly in the up and down direction again, the vibration recording lever (600) can continue to move the gear recording wheel (630) step by step. Therefore, a single gear recording wheel (630) can function as a component that records the vibration accumulation trend before and after transitioning from a normal state to an abnormal state.

[0192] The above-described recording wheel position detection unit (650) is configured to convert the accumulated movement position of the gear recording wheel (630) into an electrical signal. The recording wheel position detection unit (650) may include a light sensor, a Hall sensor, a magnetic sensor, a limit switch, a contact brush, an encoder-type detection unit, or a plurality of position contacts. For example, a position indicator projection, a groove, a magnet, or a light-blocking part may be formed on one side of the gear recording wheel (630), and the recording wheel position detection unit (650) may detect the position through which they pass and output to the control unit (700) how far the gear recording wheel (630) has moved. In another embodiment, a contact switch may be configured to be pressed whenever the outer gear (640) of the gear recording wheel (630) passes a specific position.

[0193] The above-mentioned recording wheel position detection unit (650) may detect the absolute rotational position of the gear recording wheel (630), or it may generate a pulse signal whenever the outer gear (640) passes, so that the control unit (700) calculates the accumulated movement step. In the absolute position detection method, different detection patterns may be formed at various positions of the gear recording wheel (630). In the pulse accumulation method, whenever the gear recording wheel (630) moves one step, the recording wheel position detection unit (650) provides one input signal to the control unit (700), and the control unit (700) can accumulate this and store it as an accumulated vibration value for each block terminal (200). In either method, it is sufficient if the degree of accumulated movement of the gear recording wheel (630) can be input to the control unit (700).

[0194] The second operation detection unit (660) is configured to detect whether the second auxiliary pressing unit (540) has actually protruded downward from the second receiving space (530). The second operation detection unit (660) may be positioned on the side, bottom, or facing the movement path of the second auxiliary pressing unit (540). The second operation detection unit (660) may be composed of a micro switch, a limit switch, a proximity sensor, a light sensor, a magnetic sensor, or a contact-type position detection unit. For example, when the second auxiliary pressing unit (540) protrudes downward, the protrusion on the side may press the switch, or a magnet attached to the second auxiliary pressing unit (540) may move to the detection area of ​​the magnetic sensor, thereby activating the second operation detection unit (660). This configuration is used by the control unit (700) to check the timing of the operation of the second auxiliary pressing unit (540).

[0195] The control unit (700) can process signals input from the recording wheel position detection unit (650), the contact state detection unit (730), and the second operation detection unit (660) in conjunction with each other. Specifically, the control unit (700) can store the accumulated movement position of the gear recording wheel (630) by terminal, and record the point in time when the lateral indicator (400) of a specific block terminal (200) protrudes and the point in time when the second auxiliary pressing unit (540) is operated by connecting them to the position value of the gear recording wheel (630), respectively. At this time, the control unit (700) can store identification information corresponding to each block terminal (200) together, and can distinguish which block terminal (200) has accumulated vibration values ​​even when there are multiple block terminals (200) within the same connection box body (100).

[0196] The above reference position may be the initial position of the gear record wheel (630). For example, if the gear record wheel (630) is returned to its initial position after the block terminal (200) is newly installed or after a maintenance worker retightens the fastening bolt (250), that initial position may be stored as the reference position. In another embodiment, the position of the gear record wheel (630) at the time of the previous maintenance may be stored as the reference position. In this case, the reference position does not necessarily mean only the point where the gear record wheel (630) was physically first located, but may mean a stored value that the control unit (700) uses as a reference to calculate the accumulated vibration value thereafter.

[0197] The first reference value is the position of the gear record wheel (630) at the point in time when the protruding state of the lateral indicator (400) is input by the contact state detection unit (730). That is, the first reference value indicates the point in time when the lateral indicator (400) protrudes through the indicator guide window (420) as the pressing plate body (300) rises from the corresponding block terminal (200). The control unit (700) can distinguish how much the corresponding block terminal (200) has accumulated up-and-down fine movement of the pressing plate body (300) due to train vibration before the lateral indicator (400) protrudes by using the difference between the reference position and the first reference value. This can be used as a history of accumulated vibration before the contact state abnormality is displayed externally.

[0198] The second reference value is the position of the gear record wheel (630) at the point in time when the second operation detection unit (660) detects the downward protrusion state of the second auxiliary pressing unit (540). The second reference value indicates the point in time when the second auxiliary pressing unit (540) actually protrudes downward after the lateral indicator (400) has protruded, through the release signal of the control unit (700) and the operation of the locking unit driving unit (260). The control unit (700) can distinguish the degree of additional vibration accumulated by the corresponding block terminal (200) from the point in time when the lateral indicator (400) has protruded until the point in time when the second auxiliary pressing unit (540) is operated by using the difference between the first reference value and the second reference value. This can be used as a value indicating the transient state before additional temporary contact maintenance begins after the abnormal state is displayed.

[0199] The increase in the cumulative movement position of the gear record wheel (630) after the second reference value can be managed as the cumulative value of the dangerous state vibration after the second auxiliary pressing part (540) is activated. Here, the expression "dangerous state" is not necessarily limited to the meaning that an immediate failure or signal malfunction has occurred, but may mean a state in which the block terminal (200) continues to be exposed to train vibration even after a decrease in fastening force is confirmed and the temporary contact maintenance structure is activated. Therefore, the cumulative value of the dangerous state vibration can be used by a maintenance worker to determine the condition of the block terminal (200) or to distinguish priority inspection targets.

[0200] The control unit (700) above may store the reference position, the first reference value, the second reference value, and the increment after the second reference value as terminal-specific status information. The terminal-specific status information may include at least one of the identification information of the block terminal (200), whether the lateral indicator (400) protrudes, whether the second auxiliary pressing part (540) is operated, the current position of the gear record wheel (630), the cumulative movement value from the reference position, the difference value between the first reference value and the second reference value, and the increment after the second reference value. However, the terminal-specific status information is not limited to a specific data format, and it is sufficient if it is information that can distinguish the terminal-specific status in the external maintenance system (1000).

[0201] The above-mentioned indicator guide window (420) may be formed in the shape of an elongated slot extending in the vertical direction so as not to hinder the fine vertical movement of the press plate body (300) even when the lateral indicator (400) is protruding. If the indicator guide window (420) is formed as a general circular hole or a short window, there is a possibility that the lateral indicator (400) may get caught on the upper or lower edge of the indicator guide window (420) when the press plate body (300) moves finely in the vertical direction again due to train vibration after the lateral indicator (400) is protruding. In this embodiment, by forming the indicator guide window (420) long in the vertical direction, the vertical displacement of the press plate body (300) to operate the vibration recording lever (600) can be secured even when the lateral indicator (400) is protruding.

[0202] The elongated shape of the above-mentioned indicator guide window (420) may have a width that allows lateral protrusion of the lateral indicator (400) and a vertical length that allows fine vertical movement of the pressing plate body (300). The edges of the above-mentioned indicator guide window (420) may be gently rounded to reduce friction with the lateral indicator (400), and a slanted surface or discharge groove may be formed at the corners to reduce the accumulation of foreign matter. However, these detailed shapes are exemplary structures for the indicator guide window (420) to simultaneously allow the protrusion of the lateral indicator (400) and the fine vertical movement of the pressing plate body (300).

[0203] The information transmission unit (710) can transmit terminal-specific status information or accumulated vibration values ​​stored in the control unit (700) to an external maintenance system (1000). The information transmission unit (710) may include a port connected to a wired communication module, a wireless communication module, an optical communication interface, a railway field communication network connection unit, or a portable inspection device. The external maintenance system (1000) receives terminal-specific status information and can check whether there is an abnormality in the contact state of a specific block terminal (200), the degree of accumulated vibration before the protrusion of the indicator plate, and the vibration exposure state before and after the operation of the second auxiliary pressing unit (540).

[0204] According to the above embodiment, the gear recording wheel (630) functions not merely as a component indicating whether vibration occurs, but as a mechanical recording means capable of interpreting the state change of the block terminal (200) in stages in conjunction with the protrusion point of the lateral indicator (400) and the operation point of the second auxiliary pressing part (540). Accordingly, the control unit (700) can distinguish and store the vibration accumulation for a single block terminal (200) from the normal pressurization state until the abnormal indication state, the vibration accumulation from the abnormal indication until additional temporary contact maintenance begins, and the vibration accumulation after the additional temporary contact maintenance state.

[0205] Furthermore, the vibration recording structure of this embodiment is not limited to an experimental device for precisely measuring the absolute vibration acceleration or frequency of train vibration. The purpose of this embodiment is to convert the fine up-and-down movement of the pressing plate body (300), which can directly affect the contact state inside the block terminal (200), into a stepwise movement of the gear recording wheel (630), and to store the accumulated movement position along with the point in time when the contact state changes. Accordingly, the movement step of the gear recording wheel (630) can be used as relative or accumulated state information for maintenance judgment for each block terminal (200).

[0208] Next, the connection box body (100) comprises a connection box door (110) that is openably coupled to the front or side of the connection box body (100) to expose an internal space in which a plurality of block terminals (200) are arranged to the outside, a hinge stopper (120) that fixes the connection box door (110) in an open position and releases the fixation when the connection box door (110) is further rotated in the open direction, a plurality of search bar modules (800) arranged to correspond one to the front of each of the plurality of block terminals (200), a guide cable (860) inserted into a guide mounting groove (870) of the plurality of search bar modules (800) so as to support the plurality of search bar modules (800) so as to be movable along the arrangement direction of the plurality of block terminals (200), a search bar locking piece (880) that fixes the plurality of search bar modules (800) to a standby position (920) when the connection box door (110) is closed, and the connection box It may include a door interlock release piece (130) that releases the fixation of the search bar lock piece (880) when the door (110) is partially opened, a search bar elastic piece (890) that provides elastic force to move each of the plurality of search bar modules (800) in the search direction (930) when the fixation of the search bar lock piece (880) is released, and a batch loading bar (900) that is operated by a worker before closing the connection box door (110) after maintenance work to move the plurality of search bar modules (800) in the loading direction (940) opposite to the search direction (930) and reload the plurality of search bar modules (800) into the waiting position (920).

[0209] The door interlock release piece (130) may be positioned on the inner side of the junction box door (110) or at a location adjacent to the hinge. It may be formed to release the fixation to the plurality of search bar modules (800) by pushing or pulling the search bar locking piece (880) when the junction box door (110) is partially opened.

[0210] Each of the plurality of search bar modules (800) comprises a search bar body (810) formed in a rod shape that is movably arranged along the guide cable (860) and contactable with the lateral indicator (400), a battery storage unit (820) that is received inside or on one side of the search bar body (810) and supplies power, a light-emitting indicator (830) that is disposed on the outer surface of the search bar body (810) and can be visually checked by an operator when the connection box door (110) is open, a first contact switch (840) that is pressed by the protruding lateral indicator (400) when the search bar body (810) moves in the search direction (930), a second contact switch (850) that is pressed by the protruding lateral indicator (400) when the search bar body (810) moves in the loading direction (940) by the batch loading bar (900), and the It may include a guide mounting groove (870) into which a guide cable (860) is inserted.

[0211] The above search bar body (810) has a central reference line (910) facing the direction in which the lateral indicator (400) protrudes and contacts, and the first contact switch (840) and the second contact switch (850) can be placed on the central reference line (910) so that the lateral indicator (400) can be directly pressed and operated.

[0212] The guide mounting groove (870) is formed at an avoidance position (950) that is eccentrically spaced upward or downward from the central reference line (910), so that the guide cable (860) is positioned so as not to overlap with the protruding path of the lateral indicator (400) and the contact path where the lateral indicator (400) presses the first contact switch (840) or the second contact switch (850).

[0213] The first contact switch (840) and the second contact switch (850) are positioned to face opposite directions relative to the direction of movement of the search bar body (810), and can be formed to independently detect the press of the lateral indicator (400) approaching from the search direction (930) and the lateral indicator (400) approaching from the loading direction (940).

[0214] When the above connection box door (110) is closed, the plurality of search bar modules (800) can be fixed to the standby position (920) by the search bar locking piece (880).

[0215] The above search bar elastic piece (890) can be maintained in a state that stores elastic force to move the plurality of search bar modules (800) in the search direction (930).

[0216] When the connection box door (110) is partially opened, the door interlock release piece (130) does not move the plurality of search bar modules (800) by pushing them in proportion to the degree of opening of the connection box door (110), but can release the fixation of the search bar locking piece (880) at the moment the connection box door (110) is partially opened.

[0217] The plurality of search bar modules (800) can move in the search direction (930) by the elastic force of the search bar elastic piece (890) regardless of the additional opening amount of the connection box door (110).

[0218] The search bar module (800) corresponding to the block terminal (200) on which the above-mentioned lateral indicator (400) is already protruding may be restricted from moving or stopped by coming into contact with the above-mentioned lateral indicator (400) while moving in the above-mentioned search direction (930).

[0219] The above lateral indicator (400) presses the first contact switch (840) of the corresponding search bar module (800), and the search bar module (800) with the first contact switch (840) pressed uses the power of the battery storage unit (820) to light up the light-emitting indicator (830) of the corresponding search bar module (800) so that the location of the block terminal (200) that was already in an abnormal state immediately after opening the connection box door (110) can be indicated.

[0220] The above batch loading bar (900) can be positioned along the guide cable (860) on the loading direction (940) side of the plurality of search bar modules (800).

[0221] When an operator operates the connection box door (110) before closing it, the plurality of search bar modules (800) are simultaneously pushed or pulled in the loading direction (940) to move to the waiting position (920), and when the plurality of search bar modules (800) reach the waiting position (920), they can be fixed again to the search bar locking piece (880).

[0222] The search bar module (800) that moves in the loading direction (940) by the above-mentioned batch loading bar (900) may come into contact with the newly protruding lateral indicator (400) in the loading direction (940) if there is a newly protruding lateral indicator (400) due to train vibration, reduced additional fastening force, or a change in the contact state of another block terminal (200) during maintenance work.

[0223] The newly protruding lateral indicator (400) presses the second contact switch (850) of the search bar module (800), and the search bar module (800) with the second contact switch (850) pressed uses the power from the battery storage unit (820) to light up the light-emitting indicator (830) of the search bar module (800), so that the operator can check for a newly occurring abnormal block terminal (200) during repair work or immediately before closing the connection box door (110).

[0224] The hinge stopper (120) can fix the connection box door (110) in an open state so as to maintain a workspace where the lighting state of the plurality of search bar modules (800) and the protruding state of the lateral indicator (400) can be checked.

[0225] It is characterized by being formed so that when the above connection box door (110) is additionally rotated in the opening direction, the fixation is released so that the above connection box door (110) can be closed after the operation of the above batch loading bar (900).

[0226] In the above embodiment, the junction box door (110) may be configured as a cover or door for opening or closing the internal space of the junction box body (100). The junction box door (110) may be formed of a metal plate, an insulatingly coated metal plate, or a flame-retardant synthetic resin plate, and may be hinge-connected to the front or side of the junction box body (100). When the junction box door (110) is closed, a plurality of block terminals (200) arranged inside the junction box body (100) are not exposed to the outside, and when the junction box door (110) is opened, a maintenance worker can check the status of the block terminals (200), the lateral indicator (400), and the search bar module (800).

[0227] The hinge stopper (120) is configured to temporarily fix the junction box door (110) when the junction box door (110) reaches a certain opening angle. The hinge stopper (120) may be formed by a locking piece positioned around the hinge axis, a bent elastic piece, a combination of a groove and a protrusion, a click-type locking part, or a rotation limiting arm. The hinge stopper (120) keeps the junction box door (110) open so that a worker can inspect the internal block terminal (200) using both hands. Additionally, when closing the junction box door (110), it may be configured so that the worker can release the lock of the hinge stopper (120) by pushing the junction box door (110) once more in the opening direction or by pressing the stopper release part. This configuration is intended to prevent the connection box door (110) from suddenly closing due to train vibration or wind, and to secure a workspace where the lighting status of the search bar module (800) can be stably checked.

[0228] The above-described search bar module (800) is a movable verification member positioned to correspond to each of the plurality of block terminals (200). The search bar module (800) physically contacts the protruding lateral indicator (400) when the connection box door (110) is opened, allowing the operator to quickly identify the location of the block terminal (200) where an abnormal condition has occurred. The above-described search bar module (800) can be understood as a maintenance assistance structure that mechanically searches for the location of the already protruding lateral indicator (400) and displays that location using a light-emitting indicator (830), rather than as a device that electrically inspects the signal circuit of the block terminal (200) directly.

[0229] The plurality of search bar modules (800) may be arranged side by side along the arrangement direction of the block terminals (200). For example, if the plurality of block terminals (200) are arranged in a left-right direction, the search bar modules (800) may also be arranged in a left-right direction, and each search bar module (800) may be arranged to correspond to one block terminal (200) or one side indicator (400). It is preferable that the search bar modules (800) be placed in a position that is easily visible when the operator opens the connection box door (110) or the front of the block terminal (200). At this time, "front" does not necessarily mean only the absolute front of the connection box body (100), but may mean the side on which the operator checks the block terminal (200) and the search bar module (800) when the operator opens the connection box door (110).

[0230] The search bar body (810) is a movable member that forms the basic outer shape of the search bar module (800). The search bar body (810) may be formed as a rod-shaped, elongated block-shaped, or slider-shaped member, and may be made of a metal material, an insulating synthetic resin material, or a metal material with an insulating coating. The search bar body (810) is formed to move along a guide cable (860) inside the connection box, and a light-emitting indicator (830) that can be easily checked by an operator may be placed on its outer surface. The size and length of the search bar body (810) may be determined to match the spacing of the arrangement of the corresponding block terminals (200), the protruding position of the lateral indicator (400), and the internal space of the connection box.

[0231] The guide cable (860) is a component that guides a plurality of search bar modules (800) to move along a predetermined path. The guide cable (860) may be composed of a metal wire, steel wire, insulated wire, synthetic resin cable, or an elastic guide rod. The guide cable (860) may be inserted or fitted into the guide mounting grooves (870) of the plurality of search bar modules (800), and may be fixed to both sides or an internal support of the connection box body (100). The guide cable (860) supports the search bar modules (800) so that their movement paths do not deviate significantly when they move in the search direction (930) and the loading direction (940).

[0232] The guide mounting groove (870) may be formed as a groove, a through hole, or a fitting part formed in the search bar body (810). The guide mounting groove (870) is formed in a shape into which a guide cable (860) can be inserted, allowing the search bar body (810) to slide or move along the guide cable (860). It is preferable that the guide mounting groove (870) does not coincide with the central reference line (910) of the search bar body (810) and is positioned at an eccentric avoidance position (950) that is upward or downward from the central reference line (910). This is to ensure that the guide cable (860) does not interfere with the protruding path of the lateral indicator (400) or the contact path through which the lateral indicator (400) presses the contact switch.

[0233] The central reference line (910) may be a virtual reference line set based on the direction in which the lateral indicator (400) protrudes and contacts the search bar body (810). The first contact switch (840) and the second contact switch (850) may be positioned on or adjacent to the central reference line (910) so that the lateral indicator (400) can press them directly. On the other hand, the guide mounting groove (870) is formed at an avoidance position (950) away from the central reference line (910). Accordingly, when the lateral indicator (400) protrudes and contacts the search bar body (810), the lateral indicator (400) can press the first contact switch (840) or the second contact switch (850) without interfering with the guide cable (860).

[0234] The battery storage unit (820) is configured to supply power to the search bar module (800) itself. The battery storage unit (820) may be configured as a battery insertion space, a detachable battery holder, or a small battery receiving groove formed inside the search bar body (810). A button battery, a small cylindrical battery, a rechargeable battery, or a small power source equivalent thereto may be installed in the battery storage unit (820). The battery storage unit (820) may be electrically connected to a light-emitting display unit (830) and a contact switch, and may be configured to supply power to the light-emitting display unit (830) when the first contact switch (840) or the second contact switch (850) is pressed. In this way, if the search bar module (800) has its own power, it can perform a display function independently of the existing railway signal circuit inside the junction box.

[0235] The above-mentioned light-emitting display (830) is a display means placed in a position where it can be visually checked by an operator when the connection box door (110) is open. The above-mentioned light-emitting display (830) may be composed of a light-emitting diode, a small lamp, a fiber optic display unit, or a light-emitting display window. It is preferable that the above-mentioned light-emitting display (830) be placed on the outer surface, the top surface, or the surface facing the operator when the connection box door (110) is opened of the search bar body (810). The above-mentioned light-emitting display (830) may be configured to light up when the first contact switch (840) or the second contact switch (850) is pressed, and depending on the embodiment, the lighting by the first contact switch (840) and the lighting by the second contact switch (850) may be distinguished by different lighting positions, flashing patterns, or display forms. However, such distinction of lighting methods is not essential, and it is sufficient if the operator can confirm that the search bar module (800) has come into contact with the lateral indicator (400).

[0236] The first contact switch (840) is a switch that is pressed by a protruding lateral indicator (400) when the search bar module (800) moves in the search direction (930). The first contact switch (840) may be placed on one side of the search bar body (810) and faces a direction that can be contacted first when the protruding lateral indicator (400) approaches from the search direction (930). The first contact switch (840) may be composed of a push button type switch, a leaf spring type switch, a micro switch, or a contact type conductive switch. When the lateral indicator (400) presses the first contact switch (840), power from the battery storage unit (820) is supplied to the light-emitting indicator (830), and the corresponding search bar module (800) is illuminated.

[0237] The second contact switch (850) is a switch that is pressed by a newly protruding lateral indicator (400) when the search bar module (800) moves toward the loading direction (940). It is preferable that the second contact switch (850) be positioned to face the opposite side of the first contact switch (840). This is to distinguish between the contact when the search bar module (800) moves toward the initial search direction (930) and the contact when it returns to the loading direction (940) by the batch loading bar (900). The second contact switch (850) may also be configured as a push button type switch, a leaf spring type switch, a micro switch, or a contact type conductive switch. When the second contact switch (850) is pressed, the operator can confirm that there is a newly occurred abnormal block terminal (200) before closing the connection box door (110).

[0238] The above-mentioned search bar locking piece (880) is configured to secure a plurality of search bar modules (800) to a standby position (920) while the connection box door (110) is closed. The above-mentioned search bar locking piece (880) may be composed of a stopper, a latch, a pivot locking piece, an elastic stopper, or a slide locking part. The above-mentioned search bar locking piece (880) maintains the search bar modules (800) in the standby position (920) while the connection box door (110) is closed, even if the search bar modules (800) receive a force from the search bar elastic piece (890) to move in the search direction (930). The above-mentioned standby position (920) may refer to a position where a plurality of search bar modules (800) are prepared to start searching before the connection box door (110) is opened.

[0239] The above-mentioned search bar elastic piece (890) provides elastic force to move a plurality of search bar modules (800) in the search direction (930). The above-mentioned search bar elastic piece (890) may be made of a coil spring, a tension spring, a leaf spring, an elastic band, or a wire structure having elastic restoring force. When the connection box door (110) is closed, the search bar elastic piece (890) is maintained in a tensioned or compressed state to store movement force in the search direction (930). When the fixation of the search bar locking piece (880) is released, the search bar elastic piece (890) uses the stored elastic force to move a plurality of search bar modules (800) in the search direction (930).

[0240] The above door interlock release piece (130) is configured to interlock the opening operation of the connection box door (110) with the release operation of the search bar lock piece (880). The above door interlock release piece (130) may be placed on the inner side of the connection box door (110), at a position adjacent to the hinge, or in the rotational path between the connection box body (100) and the connection box door (110). The above door interlock release piece (130) may be composed of a projection, a pressing piece, a link piece, a wire pulling part, or a cam-shaped member. When the connection box door (110) is partially opened, the above door interlock release piece (130) pushes or pulls the search bar lock piece (880) to release the locked state. At this time, it is preferable that the above door interlock release piece (130) functions as a trigger that only releases the locking of the search bar lock piece (880), rather than directly pushing and moving the search bar module (800) in proportion to the opening angle of the connection box door (110).

[0241] When configured as described above, even if the connection box door (110) is opened only slightly, the locking of the search bar locking piece (880) is released, and the search bar elastic piece (890) can move a plurality of search bar modules (800) in the search direction (930). At this time, the amount of movement of the search bar modules (800) is not directly proportional to how much more the connection box door (110) is opened, but can be determined by the elastic force of the search bar elastic piece (890) and the movement path formed along the guide cable (860). Therefore, a plurality of search bar modules (800) can already start the search operation before the operator fully opens the connection box door (110).

[0242] The above search direction (930) refers to the direction in which the search bar module (800) moves from the standby position (920) to find the protruding lateral indicator (400). The above loading direction (940) is the opposite direction to the search direction (930) and refers to the direction in which an operator operates the batch loading bar (900) to return the search bar module (800) to the standby position (920). The above search direction (930) and loading direction (940) can be determined according to the arrangement direction of the block terminals (200) inside the connection box, the protruding position of the lateral indicator (400), and the arrangement direction of the guide cable (860).

[0243] When the connection box door (110) is partially opened and the search bar locking piece (880) is released, the multiple search bar modules (800) move in the search direction (930) by the elastic force of the search bar elastic piece (890). At this time, if the lateral indicator piece (400) is already protruding from a specific block terminal (200), the search bar module (800) corresponding to that block terminal (200) comes into contact with the lateral indicator piece (400) while moving. The lateral indicator piece (400) presses the first contact switch (840) placed on the central reference line (910) of the search bar body (810), and the search bar module (800) that has the first contact switch (840) pressed lights up the light-emitting indicator (830) using the power from the battery storage unit (820). Accordingly, immediately after opening the connection box door (110), the operator can check the location of the block terminal (200) that was already in an abnormal state among the multiple block terminals (200) through the light-emitting display (830).

[0244] When the search bar module (800) comes into contact with the lateral indicator (400), movement may be restricted or stopped at that location. In this case, the location of the search bar module (800) itself, where the light-emitting indicator (830) is lit, may indicate the location of the abnormal block terminal (200). In another embodiment, the search bar module (800) may move slightly further after pressing the lateral indicator (400), but the abnormal location may be indicated by the first contact switch (840) being pressed and the light-emitting indicator (830) being lit. In either case, the operator can find the abnormal terminal based on the lit search bar module (800) without having to check numerous block terminals (200) one by one.

[0245] The above batch loading bar (900) is a manual operating member for returning a plurality of search bar modules (800) to a standby position (920) at once. The batch loading bar (900) may be positioned along a guide cable (860) on the side of the loading direction (940) of the plurality of search bar modules (800) and may be formed in the form of a rod, handle, slider, or pull bar. When a worker pushes or pulls the batch loading bar (900) before closing the connection box door (110) after completing maintenance work, the batch loading bar (900) moves the plurality of search bar modules (800) to the loading direction (940) simultaneously. When the plurality of search bar modules (800) reach the standby position (920), the search bar locking piece (880) engages again to secure the search bar modules (800) to the standby position (920).

[0246] The meaning of the above batch loading bar (900) is not limited to simply returning the search bar module (800) to its original position. Even during maintenance work, a new lateral indicator (400) may protrude due to train vibration, contact by a worker, additional loosening of the fastening bolt (250), or a change in the contact state of another block terminal (200). In this case, when a worker operates the batch loading bar (900) to move the search bar module (800) to the loading direction (940), the newly protruding lateral indicator (400) may press the second contact switch (850) of the corresponding search bar module (800). Then, the light-emitting indicator (830) is illuminated, and the worker can additionally check for an abnormal block terminal (200) that newly occurred during repair work or immediately before closing the junction box door (110).

[0247] In this way, by arranging the first contact switch (840) and the second contact switch (850) so as to face opposite directions, it is possible to perform both an abnormality check when the search bar module (800) moves in the search direction (930) and an abnormality check when it returns to the loading direction (940). The first contact switch (840) is used to check the side indicator (400) that is already protruding immediately after opening the junction box door (110), and the second contact switch (850) is used to check the newly protruding side indicator (400) before closing the junction box door (110) after maintenance work. Therefore, this embodiment can perform a first check immediately after opening the junction box and a second check before closing the junction box with a single search bar module (800) structure.

[0248] The above-mentioned light-emitting display (830) may be configured to light up for a certain period of time after the first contact switch (840) or the second contact switch (850) is pressed, or it may be configured to light up only while the switch is pressed. Additionally, the search bar module (800) may include a light-up maintenance circuit, a reset switch, or a manual light-off switch in addition to a simple power circuit. However, such circuit configurations are auxiliary embodiments for maintaining or releasing the light-up state of the light-emitting display (830), and the basic operation of this embodiment is structured such that when the lateral display (400) presses the contact switch, the light-emitting display (830) lights up using the power from the battery storage unit (820).

[0249] The hinge stopper (120) maintains the connection box door (110) in an open position so that the operator can sufficiently check the lighting status of the search bar module (800) and the protruding status of the side indicator (400). The hinge stopper (120) may be formed as a click-type locking structure, and a locking state may be formed when the connection box door (110) is opened beyond a certain angle. To close the connection box door (110), the operator may rotate the connection box door (110) one more time in the open direction or operate the release part of the hinge stopper (120) to release the locking state. Such a structure is advantageous for reducing interference with the movement of the search bar module (800) or the operation of the batch loading bar (900) by the connection box door (110) suddenly closing during operation.

[0250] According to the above embodiment, even if a plurality of block terminals (200) are densely packed inside the junction box body (100), the operator can check the location of a block terminal (200) that is already in an abnormal state through the search bar module (800) that is illuminated immediately after opening the junction box door (110). In addition, the operator can also check for newly occurring abnormal block terminals (200) while operating the batch loading bar (900) before closing the junction box door (110) after maintenance work. Therefore, the search bar module (800) of this embodiment functions as a physical maintenance auxiliary component that allows a field operator to visually check the location of abnormalities, separate from the transmission of electrical status information.

[0251] In the above embodiment, the search bar module (800), guide cable (860), search bar locking piece (880), search bar elastic piece (890), and batch loading bar (900) may be placed in the front, upper, or lateral clearance space of the block terminal (200) so as not to interfere with the wiring inside the connection box. Additionally, it is preferable that the search bar module (800) forms a guide mounting groove (870) at an avoidance position (950) so as not to obstruct the protruding path of the lateral indicator piece (400), and places the first contact switch (840) and the second contact switch (850) on the central reference line (910). With such placement, the guide cable (860) supports the search bar module (800) movably while not interfering with the operation of the lateral indicator piece (400) pressing the contact switch.

[0252] The search bar module (800) of the above embodiment can be used in parallel with electronic status information transmitted to an external maintenance system (1000). For example, when the external maintenance system (1000) indicates an abnormal status in a specific connection box, a field worker can open the connection box and check the illuminated search bar module (800) to locate the actual physical location of the abnormal block terminal (200). In addition, even when the communication status is temporarily unstable or immediate visual inspection is required at the site, the search bar module (800) can be used as a means of on-site verification by directly contacting the protruding lateral indicator (400) to illuminate the light-emitting indicator (830).

[0253] In the above embodiments, the expressions upper, lower, front, rear, and lateral directions can be understood as reference directions for describing the relative arrangement relationship between each component. For example, the upper side may refer to the direction in which the fastening bolt (250) approaches the pressing plate body (300), and the lower side may refer to the direction in which the pressing plate body (300) presses the cable conductor (230) toward the lower terminal metal part (240). Additionally, the front side may refer to the direction in which the cable conductor (230) first enters the terminal body (210), and the rear side may refer to the direction in which the cable conductor (230) is inserted into the cable insertion part (220). Therefore, regardless of the direction in which the actual railway signal junction box is installed on the ground, wall, column, or equipment frame, the directional expressions of the present embodiment can be interpreted as relative references for describing how each component moves facing each other within the block terminal (200).

[0254] The overall operation of the system according to the above embodiments can be understood by classifying it into a normal fastening state, a fastening force reduction state, a temporary contact maintenance state, a vibration accumulation recording state, and an on-site verification state. In the normal fastening state, the fastening bolt (250) presses the pressing plate body (300) downward, and the pressing plate body (300) presses the cable conductor (230) toward the lower terminal metal part (240) to maintain electrical contact. In the fastening force reduction state, the downward pressing force of the fastening bolt (250) decreases, and the pressing plate body (300) rises due to the pressing plate return elastic piece (360), and accordingly, the lateral indicator piece (400) protrudes through the indicator guide window (420). In the temporary contact maintenance state, the first auxiliary pressing part (510) first lightly presses the cable conductor (230), and after the protruding state of the lateral indicator (400) is detected, the second auxiliary pressing part (540) can additionally press the cable conductor (230). In the vibration accumulation recording state, the fine up-and-down movement of the pressing plate body (300) is recorded as an accumulated position value through the vibration recording lever (600) and the gear recording wheel (630). In the field verification state, a worker who has opened the connection box door (110) can check the location of the abnormal block terminal (200) through the light-emitting display part (830) of the search bar module (800).

[0255] The first auxiliary pressing part (510) and the second auxiliary pressing part (540) can be understood as auxiliary components for delaying the immediate disconnection of electrical contact between the cable conductor (230) and the lower terminal metal part (240) when the fastening bolt (250) is loose. Therefore, the fact that the first auxiliary pressing part (510) and the second auxiliary pressing part (540) have been operated does not mean that the block terminal (200) has been restored to a normal state. After checking whether the lateral indicator (400) is protruding, the detection result of the contact state detection part (730), whether the second auxiliary pressing part (540) is operating, or the lighting state of the search bar module (800), the maintenance worker may retighten the fastening bolt (250), check the insertion state of the cable conductor (230), or inspect whether there is foreign matter or damage on the contact surface between the lower terminal metal part (240) and the cable conductor (230). As such, the temporary contact maintenance configuration of this embodiment is an auxiliary safety configuration until maintenance, and it is preferable that actual normal restoration be achieved through inspection and re-connection work by a maintainer.

[0256] The above control unit (700) may process the decrease in compression force at the corresponding block terminal (200) as occurring when the protruding state of the lateral indicator (400) is input, but may generate terminal-specific status information by considering the accumulated vibration value for the same block terminal (200), the operation status of the second auxiliary pressing unit (540), and the previous maintenance history together as needed. For example, a state in which the lateral indicator (400) is protruding but the second auxiliary pressing unit (540) has not yet operated, a state in which the lateral indicator (400) is protruding and the second auxiliary pressing unit (540) has also operated, or a state in which the accumulated movement position of the gear record wheel (630) continues to increase even after the operation of the second auxiliary pressing unit (540) can be distinguished as different maintenance priorities. However, this priority classification is an example of the information processing method of the control unit (700), and the basic configuration of the present invention is to enable the contact state and vibration accumulation state of each block terminal (200) to be managed separately by terminal.

[0257] The vibration accumulation value calculated by the above-described gear recording wheel (630) is not limited to experimental values ​​that precisely calculate the absolute acceleration, frequency, or impulse of the train vibration. The vibration accumulation value is a value in which the result of the actual repeated movement of the pressing plate body (300) in the up-and-down direction is converted into the stepwise movement of the gear recording wheel (630) through the vibration recording lever (600). Therefore, the vibration accumulation value can be used as relative state information indicating how much mechanical movement the corresponding block terminal (200) has experienced due to repeated vibration. The external maintenance system (1000) can use this vibration accumulation value to determine the inspection time, the need for re-connection, or the need for comparative inspection with other block terminals (200) for a specific block terminal (200).

[0258] The contact state detection unit (730), recording wheel position detection unit (650), second operation detection unit (660), and search bar module (800) may each have different verification purposes. The contact state detection unit (730) is configured to transmit an electrical signal to the control unit (700) indicating whether the lateral indicator (400) is protruding, and the recording wheel position detection unit (650) is configured to transmit the degree of movement of the gear recording wheel (630) to the control unit (700). The second operation detection unit (660) is configured to verify whether the second auxiliary pressing unit (540) has actually protruded downward. On the other hand, the search bar module (800) is a physical verification configuration that allows a field worker who has opened the connection box door (110) to visually check the position of the protruding lateral indicator (400). Therefore, in this embodiment, the electronic detection and transmission function and the field visual verification function can be used complementarily.

[0259] The battery storage unit (820), light-emitting display unit (830), first contact switch (840), and second contact switch (850) of the above-mentioned search bar module (800) can form a separate display circuit that is electrically separated from the existing railway signal circuit. In this case, the search bar module (800) can light up the light-emitting display unit (830) using its own power source without using the signal current transmitted through the railway signal cable. Accordingly, the lighting operation of the search bar module (800) can be configured so as not to directly interfere with the signal transmission function of the existing railway signal circuit. However, if necessary, the lighting state or switch pressing state of the search bar module (800) may be transmitted to the control unit (700) through a separate auxiliary wiring or wireless module.

[0260] The loading operation using the above-mentioned batch loading bar (900) can be understood as a verification procedure performed before the maintenance work is completed. After inspecting the abnormal block terminal (200) inside the junction box or retightening the fastening bolt (250), the operator can operate the batch loading bar (900) to return multiple search bar modules (800) to the standby position (920) before closing the junction box door (110). In this process, if a newly protruding lateral indicator (400) is present, the second contact switch (850) of the corresponding search bar module (800) is pressed and the light-emitting indicator (830) is illuminated. Therefore, the operation of the above-mentioned batch loading bar (900) is not limited to a simple return to the original position, but can function as a procedure to check the newly occurring abnormal condition once more just before closing the junction box.

[0261] In the above embodiment, since each elastic member may be maintained in a compressed or deformed state for a long period, it is preferable that it be formed from a metal spring, leaf spring, elastic synthetic resin, or an equivalent elastic member capable of withstanding repeated compression and restoration. Additionally, components requiring movement, such as the lateral indicator (400), the first auxiliary pressing part (510), the second auxiliary pressing part (540), and the search bar module (800), may be formed with gentle edges, guide surfaces, clearance gaps, or foreign matter discharge spaces to reduce jamming caused by foreign matter. These detailed shapes are exemplary configurations to ensure that each moving member maintains a mechanical movement path even in dusty, humid, or repetitive vibration environments at the railway signaling site.

[0262] Each detection unit and each driving unit described in the above embodiments does not necessarily have to be formed as only one part. For example, the contact state detection unit (730) may include a switch that detects the protrusion of the lateral indicator (400) and wiring that transmits the switch signal to the control unit (700), and the recording wheel position detection unit (650) may include a sensor that detects the position of the gear recording wheel (630) and a signal conversion circuit. Additionally, the locking unit driving unit (260) may be configured by combining at least some of a driving pin, a slider, an electromagnet, an actuator, a return spring, and a support bracket. Accordingly, each functional member of the present embodiment may be implemented as a single part or an assembly of multiple parts to perform its function.

[0263] The structure described in the above embodiments is not limited to being applied to only one block terminal (200), but can be repeatedly applied to each of the multiple block terminals (200) arranged inside the connection box body (100). In this case, the control unit (700) can process signals from the contact state detection unit (730), the recording wheel position detection unit (650), and the second operation detection unit (660) corresponding to each of the multiple block terminals (200) by separating them by terminal. Additionally, since the search bar module (800) can be arranged to correspond to each of the multiple block terminals (200), the electronic state information and the physical lighting position can be configured to correspond to each other. With this configuration, even in a connection box where multiple block terminals (200) are densely packed, the electrical identification information of the terminal where an abnormal state has occurred and the location for visual inspection at the site can correspond to each other.

[0264] Although embodiments of the present invention have been described in more detail with reference to the attached drawings, the present invention is not necessarily limited to these embodiments and may be modified in various ways within the scope of the technical spirit of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of protection of the present invention shall be interpreted by the claims below, and all technical spirits within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0265] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below. Explanation of the symbols

[0267] 100 : Connection box main body 1000 : External maintenance system 110 : Connection box door 120 : Hinge stopper 130: Door Link Disabling Part 200 : Block terminal 210 : Terminal body 220 : Cable insertion part 230 : Cable conductor 240 : Lower terminal metal part 250 : Fastening bolt 260 : Locking piece drive unit 300 : Press plate main body 310: Upper pressure surface 320: Lower pressure surface 330 : Indicator receiving groove 340 : Press plate guide housing 350 : Side restraint wall 360 : Press plate return elastic piece 400 : Lateral indicator 410 : Indicator piece, elastic piece 420 : Display guide window 500: First containment space 510: First auxiliary pressing part 520: 1st auxiliary elastic piece 530 : Second containment space 540 : Second auxiliary pressing part 550 : 2nd auxiliary elastic piece 560: Second auxiliary locking piece 570 : Gait space 600: Vibration recording lever 610 : Press plate contact terminal 620: Wheel operating section 630 : Cogwheel 640 : Outsourcing gear 650: Recording wheel position detection unit 660: Second operation detection unit 700 : Control unit 710 : Information Transmission Unit 730 : Contact status detection unit 800 : Search bar module 810 : Search bar body 820: Battery compartment 830 : Light-emitting display 840: First contact switch 850: Second contact switch 860 : Guide cable 870 : Guide mounting groove 880: Locking the Search Bar 890 : Search bar elastic piece 900 : Batch reload bar 910 : Center baseline 920 : Waiting position 930 : Search direction 940 : Loading direction 950 : Evasion position

Claims

Claim 1 delete Claim 2 A monitoring and maintenance system based on contact state detection for a railway signal junction box comprises: a junction box main body installed at a railway signal site; a plurality of block terminals arranged inside the junction box main body and each having a cable insertion part into which a cable conductor is inserted; a lower terminal metal part disposed in the cable insertion part of each block terminal and in contact with the cable conductor; a fastening bolt and a pressing plate main body disposed in each block terminal and pressing the cable conductor toward the lower terminal metal part; a contact state detection unit that detects the contact state between the cable conductor and the lower terminal metal part based on the positional change of the pressing plate main body according to the change in pressure exerted by the fastening bolt; a control unit that collects terminal-specific state information output from the contact state detection unit; and an information transmission unit that transmits the terminal-specific state information collected by the control unit to an external maintenance system. The block terminal comprises a terminal body in which the cable insertion part, the lower terminal metal part, the fastening bolt, and the pressing plate main body are disposed; and the cable conductor enters the cable insertion part in a direction toward the rear surface of the terminal body and first enters the terminal body. The fastening bolt is inserted and coupled so as to be screw-movable downward from the upper surface of the terminal body toward the cable insertion part, and the lower terminal metal part is positioned along the lower bottom surface of the cable insertion part on the lower side of the terminal body and contacts the lower surface of the cable conductor, and the pressing plate body has an upper pressing surface facing the lower end of the fastening bolt and a lower pressing surface facing the upper surface of the cable conductor, and moves downward by the lowering of the fastening bolt and presses the cable conductor toward the lower terminal metal part with the lower pressing surface to press the cable conductor against the lower terminal metal part, and the block terminal isA press plate guide housing disposed along the outer side of the press plate body so that the press plate body moves up and down along the direction of pressure of the fastening bolt and the opposite direction; a side restraint wall formed on the side of the press plate guide housing and facing the side of the press plate body when the press plate body is in a normal pressure position where it presses the cable conductor toward the lower terminal metal part; a press plate return elastic piece disposed between the press plate body and the terminal body or between the press plate body and the press plate guide housing to push the press plate body in an upward direction opposite to the direction of pressure of the fastening bolt; a display piece receiving groove formed on the side of the press plate body and laterally open toward the side restraint wall; a lateral display piece inserted into the display piece receiving groove and disposed to protrude laterally from the display piece receiving groove toward the terminal body; and a display piece disposed between the inner wall of the display piece receiving groove and the lateral display piece to push the lateral display piece toward the terminal body toward the lateral side. It includes an elastic piece and a display guide window formed on the side of the press plate guide housing or the terminal body, and arranged to face laterally with the display guide window when the press plate body rises upward from the normal pressing position; the contact state detection unit is positioned on the outside of the display guide window or in a position facing the display guide window to detect the state in which the lateral display is protruding through the display guide window and outputs the protruding state of the lateral display to the control unit; when the fastening bolt is in a normal fastened state, the lower end of the fastening bolt presses the upper pressing surface of the press plate body downward, and the lower pressing surface of the press plate body presses the upper surface of the cable conductor toward the lower terminal metal part, and the cable conductor is compressed between the lower pressing surface of the press plate body and the lower terminal metal part.The above lateral indicator receives a force that attempts to protrude laterally outward from the indicator receiving groove by the indicator elastic member, and as the outer opening of the indicator receiving groove is positioned facing the side restraining wall, it is maintained in a state inserted inside the indicator receiving groove by the side restraining wall; when the fastening bolt is loosened due to train vibration, repeated inspection, temperature change, or a decrease in fastening force, the downward pressure exerted by the fastening bolt is reduced, the pressing plate return elastic member raises the pressing plate body upward, and due to the raising of the pressing plate body, the outer opening of the indicator receiving groove moves away from the position facing the side restraining wall and moves to a position facing the indicator guide window, the indicator elastic member pushes the lateral indicator from the indicator receiving groove toward the indicator guide window, and the lateral indicator protrudes laterally outward from the terminal body through the indicator guide window, and the contact state detection unit [determines] the protruding state of the lateral indicator according to the raising of the pressing plate body A monitoring and maintenance system based on contact status detection of a railway signal junction box, characterized by detecting a reduced compression force of a cable conductor. Claim 3 In paragraph 2, the pressing plate body comprises: a first receiving space formed on one side of the lower pressing surface and downwardly open toward the cable conductor; a first auxiliary pressing part movably received in the first receiving space; a first auxiliary elastic piece disposed between the inner ceiling surface of the first receiving space and the first auxiliary pressing part; a second receiving space formed at a position spaced apart from the first receiving space on the lower pressing surface and downwardly open toward the cable conductor; a second auxiliary pressing part movably received in the second receiving space; a second auxiliary elastic piece disposed between the inner ceiling surface of the second receiving space and the second auxiliary pressing part; and a second auxiliary locking piece that restricts the downward movement of the second auxiliary pressing part to maintain the state in which the second auxiliary pressing part is stored inside the second receiving space; and the block terminal further comprises a locking piece driving unit that moves the second auxiliary locking piece according to a release signal of the control unit, and the locking piece driving unit comprises a driving pin connected to the second auxiliary locking piece or The device includes a slider and an electromagnet or small actuator that moves the driving pin or slider according to a release signal from the control unit, wherein the first receiving space is formed in an area of ​​the lower pressing surface of the pressing plate body facing the upper surface of the cable conductor, and the lower side is open so that the first auxiliary pressing part can protrude downward from the lower pressing surface of the pressing plate body toward the cable conductor, and when the pressing plate body is positioned in a normal pressing position by the fastening bolt, the first auxiliary pressing part is received inside the lower pressing surface, and when the lower pressing force by the fastening bolt is reduced and the pressing plate body is raised upward, a passage is provided for the first auxiliary pressing part to move downward toward the cable conductor, and the first auxiliary pressing part has a short downward protruding surface that protrudes toward the cable conductor through the downward opening of the first receiving space.The short downward protruding surface is positioned to descend to a lower position than the lower pressing surface of the pressing plate body so as to press a portion of the upper surface of the cable conductor, and the downward protrusion distance of the first auxiliary pressing part is formed to provide a minimum temporary contact pressure to delay the immediate loss of contact between the cable conductor and the lower terminal metal part, and the first auxiliary elastic piece is received in a compressed or folded state within the first receiving space when the fastening bolt is properly tightened and the pressing plate body is sufficiently pressed downward, and when the fastening bolt is loosened and a gap is formed between the lower end of the fastening bolt and the upper pressing surface of the pressing plate body, and a clearance space is secured within the first receiving space in which the first auxiliary elastic piece can expand due to the rise of the pressing plate body, the first auxiliary elastic piece elastically expands using the clearance space, and due to the elastic expansion of the first auxiliary elastic piece, the first auxiliary pressing part protrudes downward by a short distance from the lower pressing surface of the pressing plate body toward the cable conductor, and the first auxiliary Even when the lateral indicator is not sufficiently protruded due to dust, friction, part jamming, or interference with the indicator guide window, the pressing part is actuated by the elastic expansion of the first auxiliary elastic piece when the pressing plate body rises due to the reduction of the lower pressure by the fastening bolt, and temporarily applies weak pressure to the cable conductor toward the lower terminal metal part to delay the cable conductor from immediately detaching from the lower terminal metal part, and the second receiving space is formed on the lower pressure surface of the pressing plate body parallel to the first receiving space or spaced apart in the front-rear direction, and maintains the second auxiliary pressing part inside the pressing plate body when the second auxiliary pressing part is received by the second auxiliary locking piece, and provides a passage through which the second auxiliary pressing part can protrude downward toward the cable conductor when the restraint of the second auxiliary locking piece is released, and the second auxiliary pressing partIt has a long downward protruding surface that protrudes toward the cable conductor through the downward opening of the second receiving space, and the long downward protruding surface is positioned to descend to a lower position than the short downward protruding surface of the first auxiliary pressing part so as to additionally press the upper surface of the cable conductor, and the downward protrusion distance of the second auxiliary pressing part is formed as a distance to additionally temporarily maintain contact between the cable conductor and the lower terminal metal part after the lateral indicator protrudes and the contact abnormality becomes identifiable from the outside, and the second auxiliary locking part is arranged to be movable between a locking position that restricts the downward movement of the second auxiliary pressing part while the second auxiliary pressing part is housed inside the second receiving space and a release position that allows the downward movement of the second auxiliary pressing part, and the contact state detection part detects the state in which the lateral indicator protrudes through the indicator guide window and outputs it to the control unit, and the control unit determines the state of reduced compression force of the cable conductor when the protrusion state of the lateral indicator is input from the contact state detection part, and the second A release signal is output to release the auxiliary locking piece, and the locking piece driving unit moves the second auxiliary locking piece from the locking position to the release position according to the release signal to release the restraint on the second auxiliary pressing part, and the second auxiliary elastic piece is received in a compressed or folded state within the second receiving space while the second auxiliary locking piece is in the locking position, and when the second auxiliary locking piece moves to the release position, it elastically expands using the clearance space secured within the second receiving space by the rise of the pressing plate body, and due to the elastic expansion of the second auxiliary elastic piece, the second auxiliary pressing part protrudes downward by a longer distance than the first auxiliary pressing part, and the second auxiliary pressing partA monitoring and maintenance system based on contact state detection of a railway signal junction box, characterized in that the above-mentioned lateral indicator protrudes to additionally temporarily press the cable conductor toward the lower terminal metal part after an abnormal contact state of the block terminal is detected by the above-mentioned contact state detection part, and the first auxiliary pressing part and the second auxiliary pressing part are not configured to restore the block terminal to a normal state by replacing the normal fastening force of the fastening bolt, but are configured to temporarily maintain contact to delay the immediate loss of electrical contact between the cable conductor and the lower terminal metal part until the fastening bolt is further loosened or a maintenance worker arrives.

Images