Self-locking type safe pick-proof lock cylinder device and opening method

Abstract

The invention discloses a self-locking type safe pick-proof lock cylinder device and an opening method. The device comprises a lock body, a lock cylinder, a lock shaft, a self-locking piece, a limiting sleeve and a spring bolt. The lock cylinder and the lock shaft are sequentially arranged in the lock body, a spiral groove is formed in the lower end of the lock cylinder, a transverse pin hole is formed in the lock shaft, and the pin shaft penetrates through the transverse pin hole to be embedded into the spiral groove, so that the lock cylinder rotates to drive the lock shaft to move axially and radially. An axial groove and a radial groove are formed in the inner wall of the limiting sleeve, and the two ends of the pin shaft extend into the limiting sleeve. A contact identification key is arranged at the top of the lock cylinder; the self-locking piece is arranged on the side portion of the lock head and comprises a lever portion and a fixing pin. A fixing pin hole is formed in the side wall of the limiting sleeve, a correct key is inserted and pressed to the bottom, the lever part is triggered to enable the fixing pin to be inserted into the fixing pin hole, and the key is rotated to drive the lock cylinder and the lock shaft to move according to a preset path. The spring bolt is arranged at the bottom of the lock shaft and telescopically rotates along with movement of the lock shaft. The invention aims to provide a lock cylinder device which has high anti-prying and anti-technical opening levels, can prevent illegal opening from the inside, actively enters a self-locking or idling state when identifying an unauthorized opening attempt, realizes access right limitation on power grid equipment, and improves the overall safety protection level of a power grid.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power grid protection, and particularly relates to a self-locking safe pick-resistant lock cylinder device and an opening method. BACKGROUND

[0002] In the field of safety protection of power systems, especially outdoor facilities of power grids, locks are the first barrier to guarantee the physical safety of key equipment such as cabinet doors of transformer substations, distribution boxes, and metering boxes. At present, the traditional mechanical lock cylinder is still widely used in such facilities, and the core structure of the lock cylinder is mostly a pin tumbler lock or a leaf lock. Such lock cylinders have exposed some inherent defects in the daily operation and maintenance of power grids, which have made it difficult to meet the current safety protection requirements.

[0003] Firstly, the special technical lock opening tool for such general lock cylinders is easily available on the market, which makes it possible for unauthorized personnel to open the lock without leaving obvious signs of damage, illegally access or damage internal power equipment, and bring hidden risks to the safe operation of power grids. Secondly, many traditional lock cylinder structures allow direct operation to open from the inside of the facility. This design is intended to facilitate operation and maintenance, but in actual operation, it may become a security loophole that can be easily opened from the inside due to the violation of operation by operation and maintenance personnel, poor key management, or damage to the protective door plate. Thirdly, when subjected to violent prying with a crowbar or similar but non-matching key, the traditional lock cylinder usually does not have effective linkage self-locking or idling functions, and the lock cylinder can be easily rotated until the structure is damaged and opened, so the anti-theft performance is limited.

[0004] With the advancement of fine management of power grid equipment, the protection requirements for outdoor equipment cabinet doors have been upgraded from ordinary anti-theft to high-strength anti-damage, anti-technical opening, and operation traceability. Therefore, the power grid industry urgently needs a new type of lock cylinder that must have a high level of pick resistance and anti-technical opening, can completely eliminate the possibility of illegal opening from the inside, and can actively enter the self-locking or idling state when unauthorized opening attempts are identified (such as using the wrong key or prying), thereby truly realizing rigid control of access permissions to key assets of power grids and improving the overall safety protection level and standardized operation and maintenance management capabilities of power grids. SUMMARY

[0005] In view of the problems in the prior art, the application provides a self-locking safe pick-resistant lock cylinder device and an opening method, which aims to provide a lock cylinder device with a high level of pick resistance and anti-technical opening, which can completely eliminate illegal opening from the inside, actively enter the self-locking or idling state when unauthorized opening attempts are identified, realize access permission control of power grid equipment, and improve the overall safety protection level of power grids.

[0006] To solve the above technical problems, the application is implemented by the following technical scheme: According to a first aspect of the present application, a self-locking security pick-proof lock cylinder device is provided, comprising a lock body, characterized in that further comprising a lock cylinder, a lock shaft, a self-locking member, a limiting sleeve and a lock bolt. The lock cylinder and the lock shaft are sequentially arranged inside the lock body from top to bottom; the lower end of the lock cylinder is provided with a spiral groove, and the lock shaft is provided with a transverse pin hole, a pin shaft penetrating through the transverse pin hole and embedded in the spiral groove, so that the rotation of the lock cylinder can drive the lock shaft to produce axial and radial movement. The limiting sleeve is sleeved outside the lock cylinder and the lock shaft, and the inner wall of the limiting sleeve is provided with an axial groove and a radial groove, and the two ends of the pin shaft extend into the axial groove or the radial groove. The bottom of the lock cylinder is provided with a lock head, the top of the lock head is provided with a contact point for identifying a key, the self-locking member is installed on the side of the lock head, and the self-locking member comprises a lever portion which can be triggered by the key and a fixed pin which can be driven by the lever portion. The side wall of the limiting sleeve is provided with a fixed pin hole; when the correct key is inserted and pressed to the bottom, the key triggers the lever portion of the self-locking member, drives the fixed pin to insert into the fixed pin hole, and fixes the lock cylinder and the limiting sleeve relative to each other, at this time, the rotation of the key can drive the lock cylinder and the lock shaft to move along a predetermined path; the lock bolt is installed at the bottom of the lock shaft, and the lock bolt realizes extension, rotation and retraction with the movement of the lock shaft.

[0007] In a possible implementation manner of the first aspect, the lock head is a specific shape structure, and the contact point is located at a specific position on the top of the lock head, only the key with a shape matching and a tooth shape corresponding to the position of the contact point can be completely inserted and pressed to a depth triggering the self-locking member.

[0008] In a possible implementation manner of the first aspect, the axial groove and the radial groove on the limiting sleeve are in communication with each other, forming a center-symmetrical guide path in the shape of L or T, for guiding the movement trajectory of the pin shaft.

[0009] In a possible implementation manner of the first aspect, the self-locking member further comprises a center ball and an elastic reset member; the top of the lever portion is a slope in contact with the key, the middle part is connected with the fixed pin through the center ball, and the elastic reset member makes the fixed pin disengage from the fixed pin hole in a normal state.

[0010] In a possible implementation manner of the first aspect, the lock bolt is initially located in a concave groove; in the unlocking process, the lock shaft first moves axially to move the lock bolt out of the concave groove, and then the lock shaft rotates radially to drive the lock bolt to rotate to an unlocking orientation.

[0011] In a possible implementation manner of the first aspect, in the locked state, the lock cylinder and the lock shaft are decoupled in movement by the position of the pin shaft in the spiral groove and the limiting sleeve groove, so that direct prying of the lock cylinder cannot be transmitted to the lock shaft and the lock tongue.

[0012] In a possible implementation manner of the first aspect, the lock body is installed in the door body lock hole through at least one fixing sleeve, and a sealing ring is arranged at the joint of the lock cylinder and the lock body.

[0013] In a possible implementation manner of the first aspect, the top of the lock body is further provided with a handle and a direction mark indicating the door opening direction.

[0014] According to the second aspect of the present application, a method for opening the self-locking type safe anti-prying lock cylinder device is provided, including the following steps: inserting a key into the lock cylinder; performing two-stage identification of the key through the shape of the lock head and the position of the contact point; if the key is matched, the key tooth shape allows the key to be completely inserted and pressed to the bottom, the bottom of the key pushes the lever part of the self-locking part, the fixing pin is inserted into the fixing pin hole of the limiting sleeve, and the fixing of the lock cylinder and the limiting sleeve is completed; if the key is not matched, the key cannot be completely inserted or cannot be pressed to the depth of triggering the self-locking part, the fixing pin remains disengaged, and the lock cylinder and the limiting sleeve can rotate relative to each other; in the case that the key is matched and the fixing is completed, rotating the key; the lock cylinder is rotated, and through the cooperation of the pin shaft in the spiral groove and the axial groove of the limiting sleeve, the lock shaft is first driven to axially extend, and the lock tongue is driven out of the concave groove; continuing to rotate the key, so that the pin shaft enters the radial groove from the axial groove, and then drives the lock shaft and the lock tongue to rotate radially, and the unlocking is completed.

[0015] In a possible implementation manner of the second aspect, if the key is not matched, directly rotating the key will cause the lock cylinder, the lock shaft and the limiting sleeve to rotate synchronously, the lock tongue is blocked in the concave groove and cannot be actuated, and the anti-prying is realized.

[0016] Compared with the prior art, the present application has at least the following beneficial effects: The application provides a self-locking type safe anti-picking lock cylinder device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments of the application, the drawings needed in the specific embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 It is a whole structure schematic diagram of the self-locking type safe anti-picking lock cylinder device.

[0019] Figure 2 It is a whole structure cross-sectional view of the self-locking type safe anti-picking lock cylinder device.

[0020] Figure 3 It is a lock shaft and lock tongue structure assembly schematic diagram of the self-locking type safe anti-picking lock cylinder device.

[0021] Figure 4It is a lock cylinder and lock shaft structure assembly diagram of a self-locking type safe anti-prying lock cylinder device.

[0022] Figure 5 It is a lock cylinder structure diagram of a self-locking type safe anti-prying lock cylinder device.

[0023] Figure 6 It is a limiting sleeve structure diagram of a self-locking type safe anti-prying lock cylinder device.

[0024] Figure 7 It is a self-locking part structure diagram of a self-locking type safe anti-prying lock cylinder device.

[0025] The figure mark is: 1, lock body; 2, lock cylinder; 201, cylinder shaft; 202, lock head; 203, contact; 204, spiral groove; 3, lock shaft; 301, lock cylinder lower shaft; 302, transverse pin hole; 303, square block; 4, lower fixed sleeve; 5, lock tongue; 6, limiting sleeve; 601, main sleeve body; 602, axial groove; 603, radial groove; 604, fixed pin hole; 7, self-locking part; 701, lever; 702, center ball; 703, fixed pin; 704, free baffle; 8, first fixed sleeve; 9, second fixed sleeve; 10, third fixed sleeve; 11, sealing ring; 12, pin shaft; 13, handle; 14, direction mark. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] The embodiment of the present application provides a self-locking type safe anti-prying lock cylinder device, which is suitable for outdoor facilities of power grid with high safety requirements, such as transformer substation cabinet door, ring network cabinet, distribution box and metering box, etc. Figures 1 to 7 As shown, it comprises a lock body 1, a lock cylinder 2, a lock shaft 3, a self-locking part 7, a limiting sleeve 6 and a lock tongue 5.

[0028] The lock cylinder 2 and the lock shaft 3 are sequentially arranged in the inside of the lock body 1 from top to bottom. The lower end of the lock cylinder 2 is internally processed with a spiral groove 204. The lock shaft 3 is provided with a transverse pin hole 302. A pin shaft 12 passes through the transverse pin hole 302 and makes both ends thereof embedded in the spiral groove 204 of the lock cylinder 2. Through this structure, the rotational movement of the lock cylinder 2 can drive the lock shaft 3 to produce a composite movement of axial and radial directions.

[0029] The limiting sleeve 6 is sleeved on the outside of the lock cylinder 2 and the lock shaft 3. The inner wall of the limiting sleeve 6 is provided with an axial slot 602 and a radial slot 603. The two ends of the pin shaft 12 extend into the axial slot 602 or the radial slot 603, and the movement track of the pin shaft 12 is limited by the slot structure. The axial slot 602 and the radial slot 603 are in communication with each other, forming a central symmetric L-shaped or T-shaped guide path for guiding the movement of the pin shaft 12.

[0030] The bottom of the lock cylinder 2 is provided with a lock head 202. The lock head 202 has a specific shape structure, and the top of the lock head 202 is provided with a contact 203 for identifying the key. The contact 203 is located at a specific position on the top of the lock head 202. Only the key with a shape matching the lock head 202 and a tooth-shaped pit position accurately corresponding to the contact 203 can be completely inserted and pressed to the designed depth.

[0031] The self-locking part 7 is installed on the side of the lock head 202. The self-locking part 7 includes a lever part 701 which can be triggered by the key and a fixed pin 703 which can be driven by the lever part 701. The top of the lever part 701 is a slope which is in contact with the key. The self-locking part 7 further includes a center ball 702 and an elastic reset part (for example, a free baffle 704 with a spring in the figure), and the middle part of the lever part 701 is connected with the fixed pin 703 through the center ball 702. The elastic reset part keeps the fixed pin 703 in a disengaged state in normal state.

[0032] The side wall of the limiting sleeve 6 is provided with a fixed pin hole 604. When the correct key is inserted and pressed to the bottom, the bottom of the key pushes the lever part 701 of the self-locking part 7, and then drives the fixed pin 703 to overcome the elastic force of the elastic reset part and insert into the fixed pin hole 604 of the limiting sleeve 6. This makes the lock cylinder 2 and the limiting sleeve 6 relatively fixed, and at this time the rotating key can drive the lock cylinder 2 and the lock shaft 3 to move together along the predetermined path.

[0033] The lock tongue 5 is installed at the bottom of the lock shaft 3 and realizes extension, rotation and retraction with the movement of the lock shaft 3. The lock tongue 5 is initially located in a concave groove. In the unlocking process, the lock shaft 3 first moves axially to move the lock tongue 5 out of the concave groove, and then the lock shaft 3 rotates radially to drive the lock tongue 5 to rotate to the unlocking orientation.

[0034] In the locked state, the lock cylinder 2 and the lock shaft 3 realize movement decoupling at specific positions in the spiral slot 204 and the limiting sleeve slot through the pin shaft 12. This design makes the direct prying force of the lock cylinder 2 unable to be effectively transmitted to the lock shaft 3 and the lock tongue 5.

[0035] The lock body 1 is installed in the door body lock hole through at least one fixing sleeve. The joint of the lock cylinder 2 and the lock body 1 is provided with a sealing ring 11 for dust and water prevention. The top of the lock body 1 is further provided with a handle 13 and a direction mark 14 for indicating the opening direction of the door.

[0036] The application provides an opening method of the device, comprising the following steps: Insert the key into the lock cylinder 2.

[0037] Two-stage identification of the key is performed through the specific shape of the lock head 202 and the specific position of the contact 203.

[0038] If the key is matched, the key teeth shape allows it to be fully inserted and pressed to the bottom. The key bottom pushes the lever part 701 of the self-locking part 7, so that the fixed pin 703 is inserted into the fixed pin hole 604 of the limiting sleeve 6, and the fixing of the lock cylinder 2 and the limiting sleeve 6 is completed.

[0039] If the key is not matched, the key cannot be fully inserted or cannot be pressed to the depth of triggering the self-locking part 7. The fixed pin 703 remains disengaged, and the lock cylinder 2 and the limiting sleeve 6 are not fixed, and relative idling can occur.

[0040] In the case that the key is matched and the fixing is completed, the key is rotated.

[0041] The lock cylinder 2 is rotated, and through the cooperation of the pin shaft 12 in the spiral groove 204 and the axial groove 602 of the limiting sleeve 6, the lock shaft 3 is first driven to axially extend, and the lock tongue 5 is driven to move out of the concave groove.

[0042] Continue to rotate the key, so that the pin shaft 12 enters the radial groove 603 from the axial groove 602, and then drives the lock shaft 3 and the lock tongue 5 to rotate radially, and the unlocking is completed.

[0043] If the key is not matched and is directly rotated, it will cause the lock cylinder 2, the lock shaft 3 and the limiting sleeve 6 to idle synchronously, and the lock tongue 5 cannot be actuated due to being blocked by the structure and being located in the concave groove, thereby achieving the anti-picking function.

[0044] The following Figures 1 to 7 A specific embodiment is described in detail.

[0045] Referring to Figure 1 and Figure 2 , the self-locking type safe anti-picking lock cylinder device of the embodiment mainly comprises a lock body 1, a lock cylinder 2, a lock shaft 3, a lower fixing sleeve 4, a lock tongue 5, a limiting sleeve 6, a self-locking part 7, a first fixing sleeve 8, a second fixing sleeve 9, a third fixing sleeve 10, a sealing ring 11, a pin shaft 12, a handle 13 and a direction mark 14.

[0046] The lock body 1 is the main housing of the device, which is fixedly installed in the lock hole of the door body, such as the lock hole of the power distribution box door plate, through the first fixing sleeve 8, the second fixing sleeve 9 and the third fixing sleeve 10. The sealing ring 11 is arranged at the joint of the lock cylinder 2 and the lock body 1, which can effectively prevent dust and moisture from entering the inside of the lock body, and ensure that the lock cylinder can still maintain stable and reliable performance in outdoor harsh environment, meeting the long-period maintenance-free operation requirement of power grid facilities. The handle 13 and the direction mark 14 arranged at the top of the lock body 1 provide convenience for the operation and maintenance personnel in the case of emergency operation or poor light, and the direction mark 14 clearly indicates the opening direction of the door, meeting the requirements of the device operation mark in the power grid safety specification.

[0047] The lock cylinder 2 and the lock shaft 3 are core transmission components, which are sequentially installed in the internal cavity of the lock body 1 from top to bottom. The lock cylinder 2 is made of high-strength material and has a customized structure such as a five-angle cylinder, which can only be inserted from the outside by a special key that is uniquely matched. The bottom of the lock cylinder 2 is provided with a lock head 202, and the top of the lock head 202 is provided with a protruding contact 203. The lock head 202 itself has a specific non-standard shape, such as a specific polygon or a notched cylinder, which performs the first level of physical screening on the key. The keys that do not match the shape cannot be inserted at all. The protruding height and position of the contact 203 are the second level of screening conditions. Only when the corresponding pit position and depth on the key tooth shape are completely matched, the key can be completely inserted and pressed to the bottom.

[0048] Referring to Figure 4 and Figure 5 , a specific spiral groove 204 is processed in the inside of the lower end of the lock cylinder 2. The upper part of the lock shaft 3 is provided with a transverse pin hole 302. A pin shaft 12 penetrates through the transverse pin hole 302 of the lock shaft 3, and the both ends of the pin shaft 12 are embedded in the spiral groove 204 of the lock cylinder 2. This connection mode enables the rotational movement of the lock cylinder 2 to be converted into a complex composite movement of the lock shaft 3 through the sliding of the pin shaft 12 in the spiral groove 204.

[0049] The limiting sleeve 6 is arranged outside the combination of the lock cylinder 2 and the lock shaft 3, and the inner wall thereof is a movement guide mechanism. As shown in Figure 6 , the main sleeve body 601 of the limiting sleeve 6 is provided with an axial groove 602 and a radial groove 603. The axial groove 602 extends along the axial direction, and the radial groove 603 is perpendicular to the axial direction. The axial groove 602 and the radial groove 603 are in communication with each other, forming a central symmetric L-shaped or T-shaped guide path. The both ends of the pin shaft 12 extend into the axial groove 602 or the radial groove 603 on the two sides of the limiting sleeve 6, and the movement thereof is strictly limited in the guide path.

[0050] The self-locking piece 7 is the core to realize the safety self-locking function. Referring to Figure 7The self-locking component 7 is installed on the side of the lock head 202. The self-locking component 7 includes a lever portion 701, a center ball 702, a retaining pin 703, and a free stop 704 containing a spring. The top of the lever portion 701 is machined into a bevel and points towards the center of the lock head 202. The retaining pin 703 is connected to the center of the lever portion 701 via the center ball 702. Under normal conditions, i.e., when no key is pressed correctly, the spring in the free stop 704 pushes up the retaining pin 703, causing its end to disengage from the corresponding retaining pin hole 604 on the side wall of the limiting sleeve 6.

[0051] The latch 5 is fixedly installed at the bottom of the lock shaft 3 by the lower fixing sleeve 4. The edge of the latch 5 is designed as a bevel to facilitate its engagement with the strike plate when the door is opened and closed. In the initial locked state, the latch 5 is located in a concave groove on the door frame or box body.

[0052] The working principle and process of this invention are as follows: The normal unlocking process uses a uniquely matched dedicated key: a. The maintenance personnel insert the special key into the lock cylinder 2. The keyhole shape of the key first matches the special shape of the lock head 202, allowing it to be inserted. When the key is pressed all the way down, the inside of the key fits against the contact point 203 on the top of the lock head 202, so that the end of the key can contact the top slope of the lever part 701 of the self-locking member 7 and apply pressure.

[0053] b. When the lever 701 is compressed, its inclined surface converts the vertical pressure into a horizontal component force. Through the transmission of the central ball 702, this force drives the fixing pin 703 to move horizontally outward, overcoming the elastic force of the spring inside the free baffle 704, and finally inserting it into the fixing pin hole 604 of the limiting sleeve 6. At this time, the lock cylinder 2 and the limiting sleeve 6 are rigidly fixed together by the fixing pin 703, becoming a synchronously rotating whole.

[0054] c. Rotate the key, causing the fixed lock cylinder 2 and the limiting sleeve 6 to rotate together. Since both ends of the pin 12 are stuck in the axial groove 602 of the limiting sleeve 6, the rotation of the lock cylinder 2 forces the pin 12 to slide downward along the spiral groove 204, thereby driving the lock shaft 3 to move axially downward first. The lock shaft 3 drives the latch 5 at its bottom to completely move out of the concave groove (axial extension action).

[0055] d. Continue rotating the key, for example, by 90 degrees, and pin 12 slides from the end of axial groove 602 into radial groove 603, which communicates with it. At this time, the rotational movement of lock cylinder 2 is converted by pin 12 into a radial rotation of lock shaft 3 around its axis by 90 degrees, thereby driving the bolt 5 to rotate to the unlocked position, and the door can be opened. Handle 13 can be used to assist in pulling the box door.

[0056] Anti-illegal opening mechanisms to address technical unlocking, forced entry, and mismatched keys: a. When the intruder uses a technical unlocking tool, a universal key or a key similar to the original key but not matching, two situations will occur: one is that the key shape does not match the lock head 202 and cannot be inserted; the other is that the key can be inserted, but due to the position or depth of the concave pit on the tooth shape, it cannot be pressed to the bottom due to the mismatch with the contact 203. In either case, the end of the key cannot contact or apply sufficient pressure to the lever portion 701 of the self-locking piece 7. Therefore, the fixed pin 703 is always retracted under the action of the spring, and the lock core 2 is separated from the limiting sleeve 6.

[0057] b. In the above state, if the lock core 2 is forcibly rotated by external force, whether it is twisted or pried with a tool, since the lock core 2 is not fixed with the limiting sleeve 6, the lock core 2 will idle relative to the limiting sleeve 6. Although the pin shaft 12 moves in the spiral groove 204, its two ends only slide in the axial groove 602 of the limiting sleeve 6 and cannot transmit effective torque or thrust to the lock shaft 3. The lock shaft 3 and the lock tongue 5 remain stationary, and the lock tongue 5 is mechanically blocked because it is still embedded in the concave groove, and the device cannot be opened. The idling feature consumes the strength of the lock picker and effectively protects the internal transmission mechanism from damage.

[0058] c. In the locked state, the pin shaft 12 is located at a specific position of the spiral groove 204 and the guide groove of the limiting sleeve 6, so that the lock core 2 and the lock shaft 3 are in decoupled state in motion. Even if the lock core 2 is directly pried or twisted from the inside after the external panel is damaged, its movement cannot be effectively transmitted to the lock shaft 3 through the pin shaft 12, achieving double protection of the inside and outside, eliminating the loophole of illegal opening from the inside, and meeting the requirement of internal security of power grid facilities.

[0059] The closing process is the reverse of the unlocking process, i.e. rotating the key in the opposite direction, the lock tongue 5 first rotates back to the position in the radial direction, then retracts into the concave groove in the axial direction, and finally the key is pulled out. The self-locking piece 7 is reset under the action of the spring, the fixed pin 703 is disengaged from the fixed pin hole 604, and the device returns to the locked standby state.

[0060] In other words, the design idea of the self-locking safe anti-picking lock core device provided by the embodiment is to build a recognition-fixation-step-by-step transmission-failure protection linkage safety mechanism. The technical solution is not a simple improvement of the existing pin or blade structure, but through a new set of mechanical component combination and motion logic, the whole process from key recognition to lock tongue action is controlled.

[0061] Firstly, in the key identification stage, the device sets up double physical barriers. The first barrier is the specific three-dimensional shape of the lock head at the bottom of the lock cylinder. Only the key that matches the shape can be inserted, which eliminates most general tools or keys with incompatible shapes. The second barrier is the contact at the top of the lock head, whose protrusion height and position serve as an identification code. Only when the corresponding pits on the special key tooth shape match in depth and position can the key penetrate the lock cylinder and press to the designed bottom. The two-level screening constitutes the first line of defense, making common technical lock-picking tools completely ineffective due to the inability to meet the precise geometric correspondence.

[0062] Secondly, the self-locking mechanism and the limiting sleeve are introduced. Only when the correct key is pressed to the bottom will its tail touch the inclined surface of the self-locking lever. Through the principle of leverage and the transmission of the central ball, this downward pressing force is converted into a horizontal pushing force, driving the front-end fixing pin of the self-locking piece to extend horizontally and insert into the fixing pin hole of the limiting sleeve side wall. The lock cylinder and the limiting sleeve outside it change from a relative motion state to a rigidly connected whole. If the wrong key or tool is used, the fixing pin will always remain retracted under the action of the internal spring, and the lock cylinder and the limiting sleeve will be in a separated state.

[0063] When the intruder uses a crowbar, wrench, or other tools to forcibly rotate the lock cylinder, the applied torque will only cause the lock cylinder to spin inside the limiting sleeve because the lock cylinder and the limiting sleeve are not fixed. Although the lock cylinder is rotating and moving the pin shaft inside it in the spiral groove, the two ends of the pin shaft are stuck in the guide groove of the limiting sleeve, and the limiting sleeve itself is not driven. Therefore, the rotational force is completely consumed in idling and cannot be transmitted downward to the lock shaft and the lock tongue.

[0064] Thirdly, the lock cylinder and the lock shaft are not rigidly connected in the traditional sense, but interact through a pin shaft. One end of the pin shaft is located in the spiral groove of the lock cylinder, and the other end is movable in the guide groove of the limiting sleeve. In the locked state, the components are in a specific geometric position, making the lock cylinder and the lock shaft kinematically decoupled. Even if the panel is broken from the inside of the device, direct action on the lock cylinder cannot be translated into the action of the lock shaft, thereby blocking the security loophole of opening from the inside.

[0065] When the correct key is used to complete the fixation and rotation, the composite action begins: in the first stage, the rotating lock cylinder drives the pin shaft through the spiral groove, forcing the lock shaft to extend linearly along the axis, and driving the lock tongue out of its hidden concave groove; in the second stage, continue to rotate, the pin shaft slides from the axial groove of the limiting sleeve into the radial groove perpendicular to it, the movement changes, and the lock shaft begins to rotate 90 degrees around its axis, thereby driving the lock tongue to rotate to the unlocked position.

[0066] In addition, the device fully considers the practical application environment of the outdoor equipment of the power grid. The sealing ring is arranged at the joint of the lock cylinder and the lock body, which can effectively resist dust and moisture erosion, and ensures reliable operation under bad conditions such as rain, snow and dust. The integrated handle at the top of the lock body and the clear direction mark reflect the humanized design, provide guidance for the operation and maintenance personnel in emergency operation, night work or wearing thick protective gloves, and meet the requirements of the safety standardization operation of the power grid.

[0067] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0068] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0069] In the present application, unless otherwise specifically defined and limited, the terms "connected", "connected" and the like should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication or interaction relationship of two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0071] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. Exemplary expressions of the above terms do not necessarily refer to the same embodiment or example in this specification. Moreover, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine or arrange the various embodiments or examples described in this specification and their features in a suitable manner, without contradiction.

[0072] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than limiting them. The protection scope of the present disclosure is not limited thereto. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easy changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present disclosure, or can easily think of changes or equivalent replacements for some technical features. Such modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be covered within the protection scope of the present disclosure.

Claims

1. A self-locking, anti-pry lock cylinder device, comprising a lock body (1), characterized in that, It also includes a lock cylinder (2), a lock shaft (3), a self-locking component (7), a limiting sleeve (6), and a lock tongue (5); The lock cylinder (2) and lock shaft (3) are arranged sequentially from top to bottom inside the lock body (1); the lower end of the lock cylinder (2) is provided with a spiral groove (204), and the lock shaft (3) is provided with a transverse pin hole (302). A pin (12) passes through the transverse pin hole (302) and is embedded in the spiral groove (204) so ​​that the rotation of the lock cylinder (2) can drive the lock shaft (3) to produce axial and radial movement; The limiting sleeve (6) is sleeved on the outside of the lock cylinder (2) and the lock shaft (3), and its inner wall is provided with an axial groove (602) and a radial groove (603). The two ends of the pin (12) extend into the axial groove (602) or the radial groove (603). The bottom of the lock cylinder (2) is provided with a lock head (202), and the top of the lock head (202) is provided with a contact point (203) for identifying the key; the self-locking member (7) is installed on the side of the lock head (202), and includes a lever part (701) that can be triggered by the key and a fixing pin (703) that can be driven by the lever part (701). The side wall of the limiting sleeve (6) is provided with a fixing pin hole (604); when the correct key is inserted and pressed to the bottom, the key triggers the lever part (701) of the self-locking member (7), driving the fixing pin (703) to insert into the fixing pin hole (604), so that the lock cylinder (2) is relatively fixed with the limiting sleeve (6). At this time, rotating the key can drive the lock cylinder (2) and the lock shaft (3) to move along a predetermined path; the lock tongue (5) is installed at the bottom of the lock shaft (3), and extends, rotates and retracts with the movement of the lock shaft (3).

2. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, The lock head (202) has a specific shape and structure. The contact point (203) is located at a specific position on the top of the lock head (202). Only keys with matching shapes and teeth that correspond to the position of the contact point (203) can be fully inserted and pressed to the depth that triggers the self-locking component (7).

3. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, The axial groove (602) and radial groove (603) on the limiting sleeve (6) are interconnected to form an L-shaped or T-shaped centrally symmetrical guide path, which is used to guide the movement trajectory of the pin (12).

4. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, The self-locking component (7) further includes a center ball (702) and an elastic reset component; the top of the lever portion (701) is an inclined surface that contacts the key, and its middle portion is connected to the fixing pin (703) through the center ball (702); the elastic reset component causes the fixing pin (703) to disengage from the fixing pin hole (604) under normal conditions.

5. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, The latch (5) is initially located in a concave groove. During the unlocking process, the lock shaft (3) first moves axially to move the latch (5) out of the concave groove. Then the lock shaft (3) rotates radially, causing the latch (5) to rotate to the unlocking position.

6. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, In the locked state, the lock cylinder (2) and the lock shaft (3) are decoupled in motion by the pin (12) in the spiral groove (204) and the limiting sleeve groove, so that the direct prying of the lock cylinder (2) cannot be transmitted to the lock shaft (3) and the lock tongue (5).

7. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, The lock body (1) is installed in the door lock hole by at least one fixing sleeve (8, 9, 10), and a sealing ring (11) is provided at the joint between the lock cylinder (2) and the lock body (1).

8. The self-locking anti-pry lock cylinder device according to claim 1, characterized in that, The top of the lock body (1) is also provided with a handle (13) and a directional indicator (14) indicating the opening direction.

9. A method for opening a self-locking, anti-pry lock cylinder device according to any one of claims 1 to 8, characterized in that, Includes the following steps: Insert the key into the lock cylinder (2); The key is identified in two levels by the shape of the lock head (202) and the position of the contact point (203); If the key matches, the key teeth allow the key to be fully inserted and pressed to the bottom. The bottom of the key pushes the lever part (701) of the self-locking member (7), so that the fixing pin (703) is inserted into the fixing pin hole (604) of the limiting sleeve (6), thus completing the fixing of the lock cylinder (2) and the limiting sleeve (6). If the key does not match, the key cannot be fully inserted or pressed to the depth that triggers the self-locking component (7), the fixing pin (703) remains disengaged, and the lock cylinder (2) and the limiting sleeve (6) can rotate relative to each other. Once the key is matched and secured, rotate the key. The lock cylinder (2) rotates, and through the engagement of the pin (12) in the spiral groove (204) and the axial groove (602) of the limiting sleeve (6), the lock shaft (3) is first driven to extend axially, thereby driving the lock tongue (5) to move out of the concave groove; Continue rotating the key to allow the pin (12) to enter the radial groove (603) from the axial groove (602), thereby driving the lock shaft (3) and the lock tongue (5) to rotate radially and complete the unlocking.

10. The opening method according to claim 9, characterized in that, If the key does not match, directly rotating the key will cause the lock cylinder (2), lock shaft (3) and limit sleeve (6) to rotate simultaneously. The lock tongue (5) will be blocked and unable to move because it is located in the concave groove, thus achieving anti-pry.

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