Three-spring interlocking switch device

Abstract

The invention discloses a three-spring interlocking switch device which comprises a lock mechanism upper part and a lock mechanism lower part which are respectively fixed on the inner walls of a box body upper part and a box body lower part. The locking and unlocking between the two parts are realized through the matching of the end parts of two lock tongues designed on the upper part of the lock mechanism and the two lock hook columns designed on the lower part of the lock mechanism. Wherein the two lock tongues are driven by the lock tongue driving lever to rotate to compress the three lock tongue springs connected with the two lock tongues, so that the two lock tongues are separated from the lock hook column to realize unlocking; and after unlocking, the two spring bolts and the spring bolt driving lever return under the action of the elastic force of the spring. On the contrary, during locking, the two lock tongues pass through the space between the two lock hook columns, and meanwhile the three lock tongue springs are compressed; after the ends of the two lock tongues pass, the two lock tongues return through the elastic force of the spring, and the lock hook columns at the ends are locked in a matched mode. A proximity sensor is further installed between the lock mechanism upper portion and the lock mechanism lower portion, and the opening and closing state of the box body is monitored. The lock structure is simple, convenient, rapid, stable and reliable to operate, and the reliability of the lock structure of the railway safety monitoring equipment is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of railway safety monitoring, and specifically introduces a three-spring interlocking switch device, whose main function is to realize the rapid locking and opening of upper and lower boxes, with high reliability and easy operation. In addition, the switch status of the upper and lower boxes can be monitored, and an alarm prompt can be given for abnormal opening. Background Art

[0002] Railway safety monitoring equipment uses sensors fixed on the trackside to comprehensively collect and analyze the temperature, image, acoustics and other information of passing trains to determine the running status of the vehicle. The sensors on the trackside are generally protected by a box, which consists of an upper box and a lower box. The two parts are relatively buckled to achieve internal sensor protection; at the same time, an elastic sealing ring is fixedly designed on the top of the lower part of the box. When the upper part of the box is buckled, the circumferential contact elastic sealing ring ensures the sealing between the two. The lower part of the box is generally fixedly connected to the track or sleepers, and the upper part of the box is connected through detachable hinges and locks. The combination of hinges and locks can realize the rapid disassembly, maintenance and replacement of the upper and lower boxes.

[0003] The existing railway safety monitoring trackside equipment often uses traditional door locks or screws to connect the upper and lower boxes. The structure is simple, but the operation is inconvenient. In addition, if the lock is not locked or opened abnormally, the monitoring center cannot monitor it, which may easily cause safety accidents. Summary of the invention

[0004] In order to solve the problems existing in the prior art, a three-spring interlocking switch device is provided, which is easy and quick to operate and has high reliability.

[0005] The three-spring interlocking switch device of the present invention comprises an upper locking mechanism and a lower locking mechanism, which are respectively fixed on the inner side walls of the upper box body and the lower box body.

[0006] The upper part of the lock mechanism comprises an upper lock block, a lock tongue, an upper lock tongue spring, a lower lock tongue spring, a lock tongue shaft, a lock tongue lever shaft and a lock tongue lever.

[0007] The upper lock block is fixedly mounted on the upper inner wall of the box. One side of the bottom of the two lock tongues has a locking hook; the other side of the top of the lock tongue is designed to be arc-shaped. The two lock tongues are arranged symmetrically, with the top arcs facing each other, and the middle part is connected to the upper lock block to form a rotating pair. The opposite side of the arc on the top of the two lock tongues is connected to the boss designed on the upper lock block through the upper lock tongue spring. At the same time, the opposite sides of the lower parts of the two lock tongues are connected by the lower lock tongue spring.

[0008] The lock tongue lever is a cam structure, located between the arc structures at the top of the two lock tongues, and is connected to the upper lock block through the lock tongue lever shaft to form a rotating pair. At the same time, one end of the lock tongue lever shaft passes through the upper wall of the box body as a rotating drive end.

[0009] The lower part of the lock mechanism includes a lower lock block and a lock hook column. The lower lock block is fixedly mounted on the lower inner wall of the box. There are two lock hook columns, which are fixed on the lower lock block; the lower sides of the two lock hook columns are designed as planes, which serve as locking surfaces. When the upper part of the lock mechanism and the lower part of the lock mechanism are in a locked state, the two lock tongues are perpendicular to the bottom surface of the upper box body, and the locking hook claws at the bottom of the two lock tongues respectively hook the locking surfaces on the two lock hook columns, and under the joint action of the upper lock tongue spring and the lower lock tongue spring, the top arcs of the two lock tongues are tightly attached to the two ends of the cam width direction. Therefore, the lock tongue lever shaft is rotated to drive the lock tongue lever to rotate, and the lock tongue lever drives the two lock tongues to rotate relative to each other, the lower lock tongue spring is further compressed, and the bottoms of the two lock tongues approach each other, so that the locking matching surface of the locking hook claws at the bottom of the two lock tongues and the locking surface of the lock hook column are released; at this time, the upper part of the box body can be opened, and the maintenance personnel can maintain the equipment in the box body.

[0010] Unlocking method:

[0011] Rotate the lock tongue lever shaft to drive the lock tongue lever to rotate, and then drive the bottom of the two lock tongues to move relative to each other. The two upper lock tongue springs and the lower lock tongue spring are further compressed, and the bottoms of the two lock tongues approach each other. At this time, the locking matching surfaces of the locking hook claws at the bottom of the two lock tongues and the locking surfaces of the lock hook column are released; after the box body is opened, release the lock tongue lever shaft, and the two lock tongues are reset by the action of the three lock tongue springs. During the reset process, the two lock tongues push the lock tongue lever to reset, and finally the two lock tongues and the lock tongue lever reach the locked state.

[0012] The locking methods are:

[0013] When the upper part of the box is buckled, the outer wall surfaces of the locking claws at the bottom of the two lock tongues are in contact with the outer wall surfaces of the two lock hook columns respectively. Under the action of the outer wall surfaces of the lock hook columns, the bottoms of the two lock tongues are relatively close. At the same time, the three lock tongue springs are compressed. Until the outer wall surfaces of the locking claws at the bottom of the two lock tongues are separated from the outer wall surfaces of the lock hook columns, the elastic force of the three lock tongue springs is used to make the two lock tongues rotate in opposite directions. At this time, the locking matching surfaces of the locking claws at the bottom of the two lock tongues cooperate with the locking surfaces of the lock hook columns to complete the locking between the upper part of the box and the lower part of the box.

[0014] A proximity sensor is also installed between the upper part of the lock mechanism and the lower part of the lock mechanism. The proximity sensor is connected to a signal circuit board installed on the inner wall of the box body, and the signal circuit board is connected to the monitoring center.

[0015] The advantages of the present invention are:

[0016] 1. The three-spring interlocking switch device of the present invention is easy and quick to operate, stable and reliable, and improves the reliability of the lock structure of the railway safety monitoring equipment.

[0017] 2. The three-spring interlocking switch device of the present invention is provided with a monitoring device, which can monitor the switch status and give an alarm for abnormal opening, thereby improving the safety and intelligence of the device.

[0018] 3. The three-spring interlocking switch device of the present invention uses three lock tongue springs for interlocking in structure. Failure of any two springs will not affect the normal operation of the switch device, and the reliability is very high.

[0019] 4. The three-spring interlocking switch device of the present invention is modularized in various parts. Each module is easy to disassemble, install and carry, meeting the actual application requirements on the railway production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation position of the three-spring interlocking switch device of the present invention on the box;

[0021] Figure 2 This is a schematic diagram of the overall structure of the three-spring interlocking switch device of the present invention;

[0022] Figure 3 It is a schematic diagram of the locking box of the three-spring interlocking switch device of the present invention.

[0023] Figure 4 It is a schematic diagram of the unlocking mode of the three-spring interlocking switch device of the present invention.

[0024] In the figure:

[0025] 1- Lock mechanism 2- Proximity sensor 3- Signal circuit board

[0026] 4- upper part of the box 5- lower part of the box 101- upper part of the lock mechanism

[0027] 102-Lower part of the lock mechanism 101a-Upper lock block 101b-Lock tongue

[0028] 101c-upper lock tongue spring 101d-lower lock tongue spring 101e-lock tongue shaft

[0029] 101f-lock tongue lever shaft 101g-lock tongue lever 101b1-locking mating surface

[0030] 101b2-semicircular arc structure 101b3-locking hook 102a-lower locking block

[0031] 102b-lock hook column 102b1-locking surface DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] The three-spring interlocking switch device of the present invention comprises a lock mechanism 1, a proximity sensor 2, and a signal circuit board 3. Figure 1 As shown. The lock mechanism 1 is composed of a lock mechanism upper part 101 and a lock mechanism lower part 102, which are respectively fixed at the relative positions of the middle of the inner wall of the front side (open side) of the upper part 4 of the box body and the lower part 5 of the box body, and the lock between the upper part 4 of the box body and the lower part 5 of the box body is achieved through the cooperation between the two. The proximity sensor 2 is installed on the lock mechanism upper part 101 and the lock mechanism lower part 102 to monitor the opening and closing state between the upper part 4 of the box body and the lower part 5 of the box body. The signal circuit board 3 is installed on the inner wall of the top surface of the upper part 4 of the box body, and the proximity sensor 2 is connected to the monitoring center through a cable; the signal circuit board 3 is used as a circuit board to receive the output signal of the proximity sensor 2, and transmits the signal to the monitoring center after collating it, and the monitoring center converts the received electrical signal output by the proximity sensor into the opening and closing state information of the upper part 4 of the box body and the lower part 5 of the box body.

[0034] like Figure 2 As shown, the upper portion 101 of the lock mechanism has symmetrical structures on the left and right, including an upper lock block 101a, a lock tongue 101b, an upper lock tongue spring 101c, a lower lock tongue spring 101d, a lock tongue shaft 101e, a lock tongue lever shaft 101f and a lock tongue lever 101g.

[0035] The upper locking block 101a is a plate-shaped structure, which is fixedly installed in the middle of the inner wall of the front side of the upper part 3 of the box body.

[0036] The lock tongue 101b includes a left lock tongue and a right lock tongue, both of which have the same structure and are rod-shaped. One side of the bottom is provided with a locking hook 101b3. The top surface of the locking hook 101b3 is a locking mating surface 101b1 designed to be perpendicular to the axis of the lock tongue 101b, and the bottom surface is an arc surface. The other side of the top of the lock tongue 101b is designed with a semicircular arc structure 101b2 that cooperates with the lock tongue lever 101g.

[0037] The left and right locking tongues of the above structure are arranged symmetrically, and the top semicircular arc structures 101b2 are opposite to each other. The middle parts of the two are connected to the left and right parts of the upper locking block 101a through the rotating shaft near the bottom edge of the upper locking block 101a through the locking tongue shaft 101e to form a rotating pair. Further, the left and right locking tongues are connected to the connecting bosses designed on the left and right sides of the upper locking block 101a through the upper locking tongue springs 101c arranged along the left and right directions along the axis. At the same time, the left and right locking tongues are connected to the opposite side of the lower part of the right and left locking tongues through the lower locking tongue springs 101d arranged along the left and right directions along the axis.

[0038] The lock tongue lever 101g is an elliptical cam symmetrical on both sides, which is arranged between the semicircular arc structures 101b2 on the top of the two lock tongues 101b, and is coaxially connected to the upper lock block 101a through the lock tongue lever shaft 101f to form a rotating pair; at the same time, the end of the lock tongue lever shaft 101f passes through the wall of the upper part 4 of the box body and is located on the outside of the upper part 4 of the box body, and the passing end is designed to be a hexagonal columnar section, which is used to cooperate with a key with a matching hexagonal cross-section recessed end. After the two are plugged in, the key is turned to drive the lock tongue lever 101g to rotate. When the elliptical cam is perpendicular to the bottom surface of the upper part 4 of the box, the two ends of the cam in the width direction are in contact with the semi-circular arc structures 101b2 on the top of the two lock tongues 101b, and the axes of the two lock tongues 101b are perpendicular to the bottom edge of the upper lock block 101a. Through the elastic force of the two upper lock tongue springs 101c and the lower lock tongue spring 101d, the semi-circular arc structures 101b2 on the top of the two lock tongues 101b are closely attached to the two ends of the cam in the width direction. By rotating the lock tongue lever 101g clockwise or counterclockwise, the bottom ends of the two lock tongues 101b can be synchronously rotated relative to each other around the lock tongue axis 101e.

[0039] The lower part 102 of the lock mechanism has a symmetrical structure on the left and right, and includes a lower lock block 102a and a lock hook column 102b. The lower lock block 102a is also a plate-shaped structure, fixedly installed in the middle of the inner wall of the front side of the lower part 5 of the box body.

[0040] There are two lock hook columns 102b, which are columnar structures and are arranged perpendicular to the lower lock block 102a, and are fixedly installed on the left and right parts of the lower lock block 102b respectively. The upper and lower sides of the two lock hook columns 102b are designed as planes on the circumference, which serve as locking surfaces 102b1. When the lock mechanism upper part 101 and the lock mechanism lower part 102 are in a locked state, the axes of the two lock tongues 101b are perpendicular to the bottom surface of the upper part 4 of the box body, and the locking matching surfaces 101b1 of the locking hook claws 103b3 at the bottom of the two lock tongues 101b are respectively fitted with the locking surfaces 102b1 on the two lock hook columns 102b, and at this time, the semi-circular arc structures 101b2 at the top of the two lock tongues 101b are close to the two ends of the cam width direction. By rotating the lock tongue lever 101g clockwise, the two lock tongues 101b are synchronously rotated around the lock tongue axis 101e relative to each other, and unlocking can be achieved.

[0041] The opening process of the three-spring interlocking switch device of the present invention is as follows Figure 3As shown, firstly, the bolt lever shaft 101f is rotated clockwise to nearly 90°, and the bolt lever shaft 101f drives the bolt lever 101g to rotate. When the bolt lever 101g rotates, the bottoms of the two bolts 101b are driven to rotate relative to each other, and the two upper bolt springs 101c and the lower bolt spring 101d are further compressed, and the bottoms of the two bolts 101b approach each other, and then the locking matching surface 101b1 of the locking hook 103b3 at the bottom of the two bolts 101b is released from the locking surface 102b1 of the lock hook column 102b; at this time, the upper part 4 of the box body can be opened, and the maintenance personnel can maintain the equipment in the box body. After the box body is opened, the bolt lever shaft 101f is released, and the two bolts 101d will be reset by the three bolt springs. During the reset process, the two bolts 101d further push the bolt lever 101f to reset, and finally the two bolts 101b and the bolt lever 101g reach the locked state. When the maintenance work is completed, the upper part 4 of the box body is directly buckled downward until the bottom surface of the upper part 4 of the box body contacts the elastic sealing ring on the top surface of the lower part 5 of the box body. At this time, the upper part 101 of the lock mechanism and the lower part 102 of the lock mechanism are locked. During the buckling process, the outer wall surfaces of the locking hook claws 101b3 at the bottom of the two lock tongues 101b are in contact with the outer wall surfaces of the two lock hook columns 102b respectively. Under the action of the outer wall surfaces of the lock hook columns 102b, the two lock tongues 101b rotate relative to each other, and the bottoms are relatively close to each other. At the same time, the three lock tongue springs are compressed; until the outer wall surfaces of the locking hook claws 101b3 at the bottom of the two lock tongues 101b are separated from the outer wall surfaces of the lock hook columns 102, the elastic force of the three lock tongue springs causes the two lock tongues 101b to rotate in the opposite direction. At this time, the locking mating surfaces 101b1 of the locking hook claws 101b2 at the bottom of the two lock tongues 101b cooperate with the locking surfaces 102b1 of the lock hook columns 102b to complete the locking between the upper part 4 of the box body and the lower part 5 of the box body.

[0042] There are two groups of proximity sensors 2, and each group of proximity sensors 2 includes a transmitting end and a receiving end. The two groups of proximity sensors are respectively group A sensors and group B sensors. Among them, the receiving ends of group A sensors and group B sensors are installed on the left and right parts of the upper locking block 101a, and the distances between the two and the bottom edge of the upper locking block 101a are different. Specifically, the receiving end of group A sensors has a certain distance from the bottom surface of the upper part 4 of the box body, and the receiving end of group B sensors is flush with the bottom surface of the upper part 4 of the box body. The transmitting ends of group A sensors and group B sensors are respectively installed on the left and right parts of the lower locking block 102a, and are both flush with the top surface of the lower part 5 of the box body, and the positions correspond to the upper and lower receiving ends of group A sensors and group B sensors.

[0043] Therefore, in the power-on state, the two groups of proximity sensors 2 output "1" when they are within the range of action, and output "0" when they are outside the range of action. By designing the two groups of proximity sensors 2 at different heights, the status monitoring of normal switch and abnormal switch of the box can be realized, as follows:

[0044] When the upper part 4 of the box body is opened normally, the upper parts of the sensors of group A and group B move up at the same time. Due to the different heights of the two, the receiving end of the sensor of group A first leaves the working distance range between it and the transmitting end, and the receiving end of the sensor of group A first outputs the signal "0". After a certain time difference, the receiving end of the sensor of group B leaves the working distance range between it and the transmitting end, and the receiving end of the sensor of group B then outputs the signal "0". The receiving ends of the sensors of group A and group B are both connected to the signal circuit board 8, which collects the output signals of the two groups of proximity sensors 2 in real time and transmits them to the monitoring center. The monitoring center can determine whether the upper part 4 of the box body is in the opening process according to the order of receiving the disconnection signal, and can record the opening time. The signal timing is "1010".

[0045] When the upper part 4 of the box body is closed normally, the receiving ends of the sensors of group A and group B move down at the same time, and the receiving end of the sensor of group B first enters the range of action between it and the transmitting end, then the receiving end of the sensor of group B first outputs a signal "1", and after a certain time difference, the receiving end of the sensor of group A enters the range of action between it and the transmitting end, and the lower part of the sensor of group A then outputs a signal "1"; the signal circuit board 8 collects the signals of the two proximity sensors 2 in real time and transmits them to the monitoring center, and the monitoring center can determine that the upper part 4 of the box body is in the closing process according to the order of receiving the disconnection signal, and can record the closing time, and the signal timing is "0101". At the same time, the total time from opening to closing can be calculated, providing a maintenance time basis for maintaining the trackside equipment.

[0046] When the upper part 4 of the box is completely closed, the two proximity sensors 2 simultaneously output a signal "1", which can be used to determine that the upper part 4 of the box is in a completely closed state. When it is not normal maintenance, if the monitoring center receives the signal "0" output by the two proximity sensors 4 at the same time, after eliminating the communication abnormality, it can be determined that the upper part 4 of the box is damaged (the hinge of the box is hit by the train, the hinge breaks, the upper box moves forward, and the two signals are disconnected at the same time) or both proximity sensors 4 are damaged, and maintenance personnel are required to perform maintenance; if the monitoring center receives the disconnection signal "0" output by the group A sensor, and the output signal of the group B sensor is "1", it can be determined that the group A sensor is damaged and maintenance personnel are required, but it does not affect the opening and closing state of the monitoring box and the alarm prompt for abnormal opening; if the monitoring center receives the signal "0" output by the group B sensor, and the signal of the group A sensor is "1", it can be determined that the group B sensor is damaged and maintenance personnel are required, but it does not affect the opening and closing state of the monitoring box and the alarm prompt for abnormal opening.

Claims

1. A three-spring interlocking switch device, characterized in that: The lock mechanism comprises an upper lock mechanism and a lower lock mechanism, which are respectively fixed on the inner side walls of the upper and lower parts of the box body; the lock mechanism upper part comprises an upper lock block, a lock tongue, an upper lock tongue spring, a lower lock tongue spring, a lock tongue shaft, a lock tongue lever shaft and a lock tongue lever; the lock mechanism lower part comprises a lower lock block and a lock hook column; In the upper part of the lock mechanism, the upper lock block is fixedly mounted on the upper inner wall of the box body; one side of the bottom of the two lock tongues is provided with a locking hook; the other side of the top of the lock tongue is designed to be arc-shaped; The two lock tongues are arranged symmetrically on the left and right, with the top arcs facing each other, and the middle part is connected to the upper lock block to form a rotating pair; the opposite side of the arc-shaped top of the two lock tongues is connected to the boss designed on the upper lock block through the upper lock tongue spring; at the same time, the opposite sides of the lower parts of the two lock tongues are connected through the lower lock tongue spring; The bolt lever is a cam structure, located between the arc-shaped structures at the top of the two bolts, connected with the upper lock block through the bolt lever shaft to form a rotating pair, and at the same time, one end of the bolt lever shaft passes through the upper wall of the box body as a rotating drive end; In the lower part of the lock mechanism, the lower lock block is fixedly mounted on the lower inner wall of the box body; there are two lock hook columns, which are fixed on the lower lock block; the lower sides of the two lock hook columns are designed to be flat, serving as locking surfaces; When the upper part of the lock mechanism and the lower part of the lock mechanism are in a locked state, the two lock tongues are perpendicular to the bottom surface of the upper box body, and the locking claws at the bottom of the two lock tongues respectively hook the locking surfaces on the two lock hook columns, and under the joint action of the upper lock tongue spring and the lower lock tongue spring, the top of the two lock tongues are arc-shaped and close to the two ends of the cam in the width direction; Unlocking method: The lock tongue lever shaft is rotated to drive the lock tongue lever to rotate, thereby driving the bottom of the two lock tongues to move relative to each other, and the two upper lock tongue springs and the lower lock tongue spring are further compressed, and the bottom of the two lock tongues approach each other. At this time, the locking matching surface of the locking hook claws at the bottom of the two lock tongues and the locking surface of the lock hook column are released; after the box body is opened, the lock tongue lever shaft is released, and the two lock tongues are reset by the action of the three lock tongue springs. During the reset process, the two lock tongues push the lock tongue lever to reset, and finally the two lock tongues and the lock tongue lever reach the locked state; The locking methods are: When the upper part of the box is buckled, the outer wall surfaces of the locking claws at the bottom of the two lock tongues are in contact with the outer wall surfaces of the two lock hook columns respectively, and the bottoms of the two lock tongues are relatively close to each other under the action of the outer wall surfaces of the lock hook columns; at the same time, the three lock tongue springs are compressed; until the outer wall surfaces of the locking claws at the bottom of the two lock tongues are separated from the outer wall surfaces of the lock hook columns, the elastic force of the three lock tongue springs is used to make the two lock tongues rotate in the opposite direction, and at this time, the locking matching surfaces of the locking claws at the bottom of the two lock tongues cooperate with the locking surfaces of the lock hook columns to complete the locking between the upper part of the box and the lower part of the box; A proximity sensor is also installed between the upper part of the lock mechanism and the lower part of the lock mechanism. The proximity sensor is connected to a signal circuit board installed on the inner wall of the box body, and the signal circuit board is connected to the monitoring center.

2. A three-spring interlock switch device as claimed in claim 1, characterized in that: The top surface of the locking hook is a plane, which serves as a matching surface to cooperate with the locking surface of the lock hook column; the bottom surface of the locking hook is an arc surface.

3. A three-spring interlock switch device as claimed in claim 1, characterized in that: The bolt lever is a symmetrical elliptical cam structure.

4. A three-spring interlock switch device as claimed in claim 1, characterized in that: The rotation driving end of the bolt lever shaft is a columnar structure with a hexagonal cross section.

5. A three-spring interlock switch device as claimed in claim 1, characterized in that: If any two of the two upper lock tongue springs and one lower lock tongue spring are damaged, the locking and unlocking between the upper and lower parts of the box body will not be affected.

6. A three-spring interlock switch device as claimed in claim 1, characterized in that: There are two groups of proximity sensors, each group of proximity sensors includes a transmitting end and a receiving end; the two groups of proximity sensors are group A sensors and group B sensors; wherein, the receiving ends of group A sensors and group B sensors are installed on the left and right parts of the upper lock block, and the distance between group A sensors and the bottom edge of the upper lock block is greater than the distance between group B sensors and the bottom edge of the upper lock block; the transmitting ends of group A sensors and group B sensors are installed on the left and right parts of the lower lock block, respectively, and are equidistant from the top surface of the lower part of the box.

7. A three-spring interlock switch device as claimed in claim 6, characterized in that: When the upper part of the box is opened normally, the receiving ends of the sensors in group A and group B move up at the same time, and the receiving end of the sensor in group A first leaves the working distance range between it and the transmitting end, and the receiving end of the sensor in group A first outputs a signal of 0, and then the receiving end of the sensor in group B leaves the working distance range between it and the transmitting end, and the receiving end of the sensor in group B outputs a signal of 0; the receiving ends of the sensors in group A and group B are both connected to the signal circuit board, and the signal circuit board collects the output signals of the two groups of proximity sensors in real time and transmits them to the monitoring center, and the monitoring center determines that the upper part of the box is in the opening process according to the disconnection signal receiving sequence, and records the opening time, and the signal timing is 1010; When the upper part of the box is closed normally, the receiving ends of the sensors in group A and group B move down at the same time, and the receiving end of the sensor in group B first enters the range of action between it and the transmitting end, then the receiving end of the sensor in group B first outputs signal 1, and then the receiving end of the sensor in group A enters the range of action between it and the transmitting end, and the lower part of the sensor in group A then outputs signal 1; the signal circuit board collects the signals of the two proximity sensors in real time and transmits them to the monitoring center, and the monitoring center determines that the upper part of the box is in the closing process according to the order of receiving the disconnection signals, and records the closing time, and the signal timing is 0101; at the same time, the total time from opening to closing is calculated; When the upper part of the box is completely closed, and the two proximity sensors simultaneously output signal 1, the upper part of the box is judged to be in a completely closed state; when no maintenance is performed, if the monitoring center simultaneously receives a signal 0 from the output of the two proximity sensors, after eliminating communication abnormalities, it is judged that the upper part of the box is damaged or both proximity sensors are damaged; if the monitoring center receives a disconnection signal 0 from the output of sensor group A, and the output signal of sensor group B is 1, it is judged that the sensor group A is damaged; if the monitoring center receives a signal 0 from the output of sensor group B, and the signal of sensor group A is 1, it is judged that the sensor group B is damaged.

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