Anti-theft gate valve

Abstract

The application belongs to the technical field of anti-theft gate valves, and discloses an anti-theft gate valve which comprises a gate valve body and a protective cover. In the application, when the gate valve body is in use, a protective cover is installed on the outer periphery of a valve body rod used for controlling the opening and closing of a valve plate. The protective cover can separate the adjustment area from the external structure, thereby avoiding the operation of the valve body rod by non-workers, improving the anti-theft property and protection effect of the structure, and providing multiple sets of protection measures inside the protective cover. The multiple sets of structures have a clear sequence, and workers can operate them one by one according to the operation specification, thereby opening the valve body. Non-workers cannot open the valve body because they do not have the operation specification, and thus the sequence of the structure is not clear, so that the protection and anti-theft effects can be better achieved. The application has the advantages of good anti-theft effect, high difficulty of non-professional operation and strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of anti-theft gate valve technology, and in particular to an anti-theft gate valve. Background Technology

[0002] Valves are an indispensable piece of equipment in industrial pipelines, used to cut off and regulate the fluid medium in the pipeline. Some pipeline valves are installed in the field, and some unauthorized personnel take advantage of the fact that these valves are usually located in remote and unattended locations to open the valves and steal oil or other substances from the pipeline.

[0003] A burglarproof gate valve is disclosed in Chinese utility model patent application number CN202120292847.7, which includes a valve body, a rotating block and a rotating rod. The valve body is provided with a valve cover, and a valve rod is provided inside the valve body and the valve cover. A rotating block is provided at the upper end of the valve rod. The valve body is provided with a protective shell, and a through hole is provided on the protective shell corresponding to the rotating block. Fixing plates are provided on the upper sides of the left and right sides of the protective shell.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: Existing anti-theft gate valves use specific tools for opening or closing. After use, staff take these tools away, preventing unauthorized personnel from using them to open the valve and steal oil or other substances, thus failing to achieve the anti-theft function. However, unauthorized personnel can use other tools or create simple tools based on the valve stem's structure to control the valve stem, thereby opening the valve and stealing oil or other substances, resulting in an unsatisfactory anti-theft effect of the gate valve. Utility Model Content

[0005] To solve the above problems, this utility model provides an anti-theft gate valve.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an anti-theft gate valve, comprising a gate valve body and a protective cover, wherein the protective cover is sleeved around the valve body rod on the surface of the gate valve body and is welded to the surface of the gate valve body; a top rod is rotatably connected to the top center of the protective cover; a top plate is installed on the top of the top rod; a center rod and a center disc are rotatably connected together between the top plate and the top rod, and the center disc is fixed to the center rod; a bearing plate is installed below the top rod inside the protective cover; a base plate is installed at the bottom center of the bearing plate; the bottom of the base plate is rotatably connected to the valve body rod through a support rod; a mating groove is provided at the top center of the valve body rod, the top center of the bearing plate, and the top center of the top plate; a ejection groove is provided at the bottom center of the mating groove on the surface of the valve body rod; a second spring is installed inside the ejection groove; several sets of adjusting screws are circumferentially installed on the surface of the protective cover; a locking block is rotatably connected to one end of the adjusting screw; a locking groove is correspondingly provided at one end of the locking block on the surface of the bearing plate.

[0007] By adopting the above technical solution, a bearing plate is centrally installed inside the protective cover, and a base plate is welded to the bottom of the plate. The base plate is rotatably connected to the top of the valve body rod via three sets of support rods (such as φ8mm stainless steel rods) (such as bearing model 6202, ensuring that the bearing plate can rotate synchronously with the valve body rod); protective sealing: the weld gap between the protective cover and the gate valve body is ≤0.5mm, preventing rainwater and impurities from entering the anti-theft cavity (avoiding valve body rod corrosion and extending service life); load-bearing stability: the support rods are distributed in an equilateral triangle, and the connection with the base plate and valve body rod is argon arc welding, ensuring that the bearing plate is evenly stressed and avoiding jamming during rotation; physical isolation: the protective cover completely isolates the valve body rod from the outside, and non-staff members cannot directly contact the valve body rod (traditional gate valves without protection can be directly rotated with a wrench), improving the basic anti-theft level; load transmission: the bearing plate, as an intermediate transmission component, can transmit external operating force to the valve body rod through the support rods, while the locking structure restricts unauthorized rotation (in the locked state, it cannot be driven without a special tool); top rod and top plate: the top of the protective cover The top rod is rotatably connected to the center of the unit. A top plate is welded to the top of the top rod. A first spring is fitted around the outer circumference of the top rod. The spring is welded to the top of the protective cover, and its other end only contacts the top plate without being fixedly connected, facilitating the raising and lowering of the top rod. The center rod and center plate: A through hole is opened at the center of the top plate and the top rod, rotatably connecting the center rod. A center plate is welded to the top of the center rod. The center plate is concentric with the center rod and can rotate independently of the top rod. Operation sequence constraints: When not pressed, the first spring lifts the top plate, and there is a certain gap between the bottom connecting block of the top rod and the top connecting groove of the bearing plate (they cannot contact each other), forcing the "top plate to be pressed first" to achieve docking. The center plate is supported by the top plate. When the top plate is not pressed, there is a certain gap between the bottom connecting block of the center rod and the top connecting groove of the valve body rod (they cannot contact each other), forming a sequence constraint that "top plate operation takes priority over center plate operation." Multi-stage linkage: The docking of the top rod with the bearing plate and the docking of the center rod with the valve body rod form a "dual-stage transmission." Only when both stages are docked simultaneously can torque be transmitted (operating the top rod or center rod alone results in idle rotation), improving the anti-theft performance compared to traditional single-stage operation.

[0008] Furthermore, mating blocks are installed at the bottom of the top rod, the surface of the central disc, and the bottom of the central rod.

[0009] By adopting the above technical solution, welding blocks are welded to the bottom of the top rod, the lower surface of the center plate, and the bottom of the center rod; welding grooves (triangular grooves matching the welding blocks) are opened at the center of the top of the valve body rod, the top of the bearing plate, and the top of the top plate to ensure that the welding blocks can be smoothly inserted (gap ≤ 0.1mm); welding accuracy: the structure of the welding block and the welding groove (such as setting it into a special shape or setting it into different sizes, the illustration shows a rectangular structure to facilitate personnel to understand the structure, the specific structure can be adjusted according to the actual situation) has a unique matching direction, and can only be inserted when rotated to a specific angle (non-operators cannot align it by blindly rotating it, and the success rate of trial and error is low); operation memory: the structure of the welding block and the elastic feedback of the spring form "operational feel memory", and operators can confirm that the welding is in place by feel. Non-operators are prone to misoperation due to unfamiliarity with the feel (low success rate).

[0010] Furthermore, several sets of sliding rods are symmetrically installed on the outer periphery of the adjusting screw at positions on the inner surface of the protective cover, and the sliding rods are slidably connected to the locking block.

[0011] By adopting the above technical solution, multiple sets of adjusting screws (M12×100mm, trapezoidal thread, strong self-locking) are evenly distributed on the outer periphery of the protective cover. One end of the screw passes through the protective cover (fitting clearance 0.2mm), and the other end is connected to a locking block (arc-shaped, matching the outer periphery of the bearing plate) through a bearing. A protrusion (e.g., hemispherical, 5mm in diameter) is provided in the middle of the inner side of the locking block, and a corresponding locking groove (e.g., hemispherical, 5mm deep, with a clearance of 0.1mm from the protrusion) is opened on the outer periphery of the bearing plate; Slide rod guide: Slide rods (e.g., φ8mm×50mm in length, stainless steel) are symmetrically welded on both sides of each set of adjusting screws, and a sliding hole is opened in the locking block (with a clearance of 0.1mm from the slide rod) to ensure that the locking block slides radially; Ejection groove and second spring: An ejection groove is opened at the bottom of the groove connecting the top of the valve body rod, and a second spring is built in. The top of the spring is connected to the middle The bottom of the core rod contacts (the center rod is lifted when not in the docking state); Locking accuracy: For every rotation of the adjusting screw, the locking block moves 1.5mm (trapezoidal thread lead 1.5mm), reducing the alignment deviation between the protrusion and the locking groove, ensuring that the locking block can be accurately engaged; Unlocking coordination: The locking block must be completely disengaged from the locking groove after the top rod and the bearing plate are docked (otherwise the bearing plate will be locked and cannot rotate), forming a "docking first, then unlocking" sequence constraint; Forced locking: When not unlocked, the locking block protrusion is engaged in the locking groove, and the bearing plate cannot rotate (even if the top rod is docked, it will spin freely). Non-operators will not know that the adjusting screw needs to be adjusted to unlock, and will not be able to drive the valve body rod (improving the success rate of anti-theft); Anti-misoperation: The sliding rod guide ensures that the locking block only moves radially, avoiding locking failure due to vibration or collision (improving locking reliability).

[0012] Furthermore, a first spring is sleeved around the outer periphery of the top rod, and the bottom end of the first spring is fixed to the surface of the protective cover.

[0013] By adopting the above technical solution, the first spring provides support for the reset of the push rod and the deformation size limits the amount of movement of the push rod.

[0014] Furthermore, the locking block has an arc-shaped structure, and a protrusion is provided in the middle of the structure.

[0015] By adopting the above technical solution, the locking block structure is adapted to the bearing disk structure, making it easy to use in conjunction with the device.

[0016] Furthermore, the top of the valve body rod is provided with a circular groove around the outer periphery of the docking groove for the support rod to rotate.

[0017] By adopting the above technical solution, the circular groove is designed to limit the movement trajectory of the support rod, ensuring stable and reliable movement.

[0018] Furthermore, the protective cover has an anti-theft cavity inside.

[0019] By adopting the above technical solution, a protective cover (such as Q235 steel plate) is welded to the outer periphery of the valve body stem (used to control the opening and closing of the valve plate) on the surface of the gate valve body (cast iron material). The bottom of the protective cover is fully welded to the gate valve flange face to form a closed anti-theft cavity, which completely wraps the valve body stem.

[0020] Furthermore, a through hole is provided in the middle of the bearing plate for the movement of the central rod.

[0021] By adopting the above technical solution, the through hole facilitates the movement of the center rod and makes the structure easier to use; Authorized operation steps (for workers): Top plate docking: Press the top plate (overcoming the first spring force, the top rod moves down a certain distance, such as 15mm, and the bottom docking block aligns with the docking groove at the top of the bearing plate); Rotate the top plate to insert the docking block into the groove (a "click" sound is heard), and the top rod and the bearing plate form a rigid connection; Unlock the bearing plate: Use a special wrench to rotate the three sets of adjusting screws (simultaneous operation), driving the locking block to move radially outward 7.5mm along the slide rod, the protrusion completely exits the locking groove, and the bearing plate is unlocked; Center rod docking: Press the center plate (overcoming the second spring force), the center rod moves down 30mm, and the bottom docking block aligns with the docking groove at the top of the valve body rod; Rotate the center plate to insert the docking block into the groove, and at the same time, the docking block on the lower surface of the center plate inserts into the docking groove at the top of the top plate, forming a three-level linkage of "center plate-top plate-valve body rod"; Drive the valve body rod:

[0022] Continuously press the center plate and top plate (keeping them aligned), and rotate the center plate synchronously. The torque is transmitted sequentially through the center rod and then the valve body rod, achieving the opening and closing of the gate valve (rotation angle 0-90°, corresponding to the valve plate being fully closed-fully open). Reset and locking: After the operation is completed, rotate the center plate and top plate in the opposite direction, and the connecting block exits the connecting groove; release the press, and the first and second springs reset the top rod and center rod; rotate the adjusting screw in the opposite direction, and the locking block protrusion engages with the locking groove, relocking the bearing plate. Unauthorized operation difficulties (for non-staff members): If the center plate is operated first, the center rod cannot move down to the valve body rod connecting groove (30mm gap) because the top plate is not pressed, and free rotation is ineffective; if the adjusting screw is unlocked first, the valve body rod cannot be driven by rotating the center plate because the top rod is not aligned with the bearing plate; Failure of fit: The structure of the connecting block and the connecting groove needs to be precisely aligned, and non-staff members blindly... Low probability of rotational alignment; even if alignment is accidental, torque cannot be transmitted because continuous pressing is not required (spring reset causes the docking block to disengage); Anti-theft reliability: multi-level operation sequence (top plate docking → unlocking → center rod docking) + special matching structure (docking block, locking protrusion) reduces the success rate of unauthorized opening, far superior to traditional gate valves; Ease of operation: when operated according to standard procedures, the spring reset and guide structure ensure smooth operation (no jamming), adapting to frequent opening and closing scenarios; Environmental adaptability: the protective cover seal + stainless steel components can withstand outdoor wind, rain, and corrosion, extending the maintenance cycle; through the collaborative design of "physical isolation + multi-level linkage + sequence constraint + special matching", this anti-theft gate valve effectively solves the problem of traditional gate valves being easily opened by unauthorized means, and is especially suitable for the security protection of key facilities such as municipal water supply and gas pipelines.

[0023] In summary, this utility model has the following beneficial effects:

[0024] In this application, when the gate valve body is in use, a protective cover is installed on the outer periphery of the valve body rod used to control the opening and closing of the valve plate. The protective cover separates the adjustment area from the external structure, thereby preventing unauthorized personnel from operating the valve body rod, thus improving the anti-theft and protective effects of the structure. Moreover, the protective cover has multiple sets of protective measures inside, and the multiple sets of structures have a clear sequence. Personnel can operate them one by one according to the operating procedures to open the valve body. Unauthorized personnel, due to a lack of operating procedures, do not understand the sequence of structures and are therefore unable to open the valve body. This provides better protection and anti-theft effects, and has the advantages of good anti-theft effect, high difficulty for non-professionals to operate, and strong practicality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the anti-theft cavity according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the docking groove according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the docking block according to an embodiment of the present invention.

[0029] In the diagram: 1. Gate valve body; 2. Top groove; 3. Protective cover; 4. Adjusting screw; 5. Slide rod; 6. Bearing plate; 7. Connecting groove; 8. Support rod; 9. Top plate; 10. Center plate; 11. Connecting block; 12. First spring; 13. Center rod; 14. Top rod; 15. Anti-theft cavity; 16. Locking groove; 17. Locking block; 18. Base plate; 19. Valve body rod; 20. Second spring. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] like Figure 1-4As shown in the embodiment of this application, an anti-theft gate valve is disclosed, including a gate valve body 1 and a protective cover 3. The protective cover 3 is sleeved around the valve body rod 19 on the surface of the gate valve body 1, and the protective cover 3 is welded to the surface of the gate valve body 1. A top rod 14 is rotatably connected to the top center of the protective cover 3. A top plate 9 is installed on the top of the top rod 14. A center rod 13 and a center plate 10 are rotatably connected to the top plate 9 and the top rod 14, and the center plate 10 is fixed to the center rod 13. A support plate 6 is installed below the top rod 14 inside the protective cover 3. A base plate 18 is installed at the bottom center of the support plate 6. The bottom of the base plate 18 is rotatably connected to the valve body rod 19 through a support rod 8. The top center of the valve body rod 19, the top center of the support plate 6, and the top of the top plate 9 are connected to the valve body rod 19. Each part has a mating groove 7 in the middle. A top-out groove 2 is located at the bottom center of the mating groove 7 on the surface of the valve body rod 19. A second spring 20 is installed inside the top-out groove 2. Several sets of adjusting screws 4 are installed around the surface of the protective cover 3. One end of the adjusting screw 4 is rotatably connected to a locking block 17. One end of the locking block 17 is located on the surface of the bearing plate 6 and has a corresponding locking groove 16. The bearing plate 6 is installed in the center inside the protective cover 3. A base plate 18 is welded to the bottom of the plate. The base plate 18 is rotatably connected to the top of the valve body rod 19 through three sets of support rods 8 (such as φ8mm stainless steel rods) (such as bearing model 6202, to ensure that the bearing plate 6 can rotate synchronously with the valve body rod 19). Protective sealing: The weld gap between the protective cover 3 and the gate valve body 1 is ≤0.5mm, preventing rainwater and impurities from entering the anti-theft cavity 15 (avoiding corrosion of the valve body rod 19 and extending its service life); load-bearing stability: the support rods 8 are distributed in an equilateral triangle, and the connection with the chassis 18 and valve body rod 19 is made by argon arc welding to ensure that the load-bearing plate 6 is evenly stressed and avoids jamming during rotation; physical isolation: the protective cover 3 completely isolates the valve body rod 19 from the outside, and non-staff members cannot directly contact the valve body rod 19 (traditional gate valves can be directly rotated with a wrench when there is no protection), thus improving the basic anti-theft level; load transmission: the load-bearing plate 6, as an intermediate transmission component, can transmit external operating force to the valve body rod 19 through the support rods 8, and at the same time restrict unauthorized rotation through the locking structure (in the locked state, it cannot be driven without a special tool); top rod 14 and top plate 9: the top center of the protective cover 3 is rotatably connected to the top rod 14, the top plate 9 is welded to the top of the top rod 14, and the first spring 12 is sleeved on the outer periphery of the top rod 14. The spring is welded to the top of the protective cover 3 and the other end only contacts the top plate 9 without being fixedly connected, which facilitates the lifting of the top rod 14. Lowering; Center rod 13 and center plate 10: The center of the top plate 9 and the top rod 14 have through holes, which rotatably connect the center rod 13. The top of the center rod 13 is welded to the center plate 10. The center plate 10 is concentric with the center rod 13 and can rotate independently of the top rod 14; Operation sequence constraint: When not pressed, the first spring 12 lifts the top plate 9, and there is a certain gap between the bottom docking block 11 of the top rod 14 and the top docking groove 7 of the bearing plate 6 (cannot contact), which requires "pressing the top plate 9 first" to achieve docking; Center plate 1 Supported by the top plate 9, when the top plate 9 is not pressed, there is a certain gap (unable to contact) between the bottom connecting block 11 of the center rod 13 and the top connecting groove 7 of the valve body rod 19, forming a sequential constraint that "the operation of the top plate 9 takes precedence over the center plate 10"; multi-stage linkage: the top rod 14 connects with the bearing plate 6, and the center rod 13 connects with the valve body rod 19, forming a "two-stage transmission". Torque can only be transmitted when both stages are connected simultaneously (operating the top rod 14 or the center rod 13 alone results in idle rotation), improving the anti-theft performance compared to traditional single-stage operation.

[0032] like Figure 1 and Figure 4As shown, mating blocks 11 are installed at the bottom of the top rod 14, the surface of the center plate 10, and the bottom of the center rod 13. The mating blocks 11 are welded to the bottom of the top rod 14, the lower surface of the center plate 10, and the bottom of the center rod 13. The top center of the valve body rod 19, the top center of the bearing plate 6, and the top center of the top plate 9 are all provided with mating grooves 7 (triangular grooves that match the mating blocks 11) to ensure that the mating blocks 11 can be smoothly inserted (gap ≤ 0.1mm). The mating accuracy: The structure of the mating blocks 11 and the mating grooves 7 (if set to a special shape or different size, the diagram shows a rectangular structure for easy understanding of the structure; the specific structure can be adjusted according to the actual situation) has a unique matching direction. It can only be inserted when rotated to a specific angle (non-staff members cannot align it by blindly rotating it, resulting in a low success rate of trial and error). The operation memory: The structure of the mating blocks 11 and the elastic feedback of the spring form an "operational feel memory". Staff members can confirm that the mating is in place by feel. Non-staff members are prone to misoperation due to unfamiliarity with the feel (low success rate).

[0033] like Figure 1 and Figure 2As shown, several sets of sliding rods 5 are symmetrically installed on the outer periphery of the adjusting screw 4 at positions on the inner surface of the protective cover 3. The sliding rods 5 are slidably connected to the locking block 17. Multiple sets of adjusting screws 4 (M12×100mm, trapezoidal thread, strong self-locking) are evenly distributed on the outer periphery of the protective cover 3. One end of the screw passes through the protective cover 3 (fitting clearance 0.2mm), and the other end is connected to the locking block 17 (arc-shaped, matching the outer periphery of the bearing plate 6) through a bearing. A protrusion (e.g., hemispherical, diameter 5mm) is provided at the middle position of the inner side of the locking block 17. A corresponding locking groove 16 (e.g., hemispherical, depth 5mm, clearance 0.1mm from the protrusion) is opened on the outer periphery of the bearing plate 6. Sliding rod 5 guidance: Sliding rods 5 (e.g., φ8mm×length 50mm, stainless steel) are symmetrically welded on both sides of each set of adjusting screws 4. The locking block 17 has a sliding hole (0.1mm clearance from the sliding rod 5) to ensure that the locking block 17 slides radially. Ejection groove 2 and second spring 20: An ejection groove is opened at the bottom of the groove 7 at the top of the valve body rod 19. 2. Built-in second spring 20, the top of the spring contacts the bottom of the center rod 13 (lifting the center rod 13 when not in the docking state); Locking accuracy: for every one rotation of the adjusting screw 4, the locking block 17 moves 1.5mm (trapezoidal thread lead 1.5mm), reducing the alignment deviation between the protrusion and the locking groove 16, ensuring that the locking block 17 can be accurately engaged; Unlocking coordination: the locking block 17 must be completely disengaged from the locking groove 16 only after the top rod 14 is docked with the bearing plate 6 (otherwise the bearing plate 6 will be locked and cannot rotate), forming a "docking first, then unlocking" sequence constraint; Forced locking: when not unlocked, the protrusion of the locking block 17 is engaged in the locking groove 16, and the bearing plate 6 cannot rotate (even if the top rod 14 is docked, it will still spin freely). Non-operators will not know that the adjusting screw 4 needs to be adjusted to unlock, and will not be able to drive the valve body rod 19 (improving the anti-theft success rate); Anti-misoperation: the guide of the slide rod 5 ensures that the locking block 17 only moves radially, avoiding locking failure due to vibration or collision (improving locking reliability).

[0034] like Figure 1 and Figure 2 As shown, a first spring 12 is sleeved on the outer periphery of the push rod 14, and the bottom end of the first spring 12 is fixed to the surface of the protective cover 3. The first spring 12 provides support for the reset of the push rod 14 and the deformation size limits the movement of the push rod 14.

[0035] like Figure 1 and Figure 2 As shown, the locking block 17 has an arc-shaped structure and a protrusion in the middle of the structure. The structure of the locking block 17 is adapted to the structure of the bearing plate 6, which is convenient for matching use.

[0036] like Figure 1 and Figure 2 As shown, the top of the valve body rod 19 is provided with a circular groove around the outer periphery of the docking groove 7 for the support rod 8 to rotate. The circular groove is designed to limit the movement trajectory of the support rod 8 and ensure stable and reliable movement.

[0037] like Figure 1 and Figure 2 As shown, the protective cover 3 has an anti-theft cavity 15 inside. The protective cover 3 (such as Q235 steel plate) is welded to the outer periphery of the valve body rod 19 (used to control the opening and closing of the valve plate) on the surface of the gate valve body 1 (cast iron material). The bottom of the protective cover 3 is fully welded to the gate valve flange face to form a closed anti-theft cavity 15, which completely wraps the valve body rod 19.

[0038] like Figure 1 and Figure 2As shown, a through hole is provided in the middle of the bearing plate 6 for the movement of the center rod 13. The through hole facilitates the movement of the center rod 13 and makes the structure easier to use. Authorized operation steps (for workers): Top plate 9 docking: Press the top plate 9 (overcoming the elastic force of the first spring 12, the top rod 14 moves down a certain distance, such as 15mm, and the bottom docking block 11 aligns with the docking groove 7 at the top of the bearing plate 6); Rotate the top plate 9 so that the docking block 11 is inserted into the groove (a "click" sound is heard), and the top rod 14 forms a rigid connection with the bearing plate 6; Unlocking the bearing plate 6: Use a special wrench to rotate the three sets of adjusting screws 4 (simultaneous operation), driving the locking block 17 to move radially outward along the slide rod 5 by 7.5mm, the protrusion completely exits the locking groove 16, and the bearing plate 6 is unlocked; Center rod 13 Docking: Press the center plate 10 (overcoming the elastic force of the second spring 20), the center rod 13 moves down 30mm, and the bottom docking block 11 aligns with the top docking groove 7 of the valve body rod 19; rotate the center plate 10 so that the docking block 11 is inserted into the groove, and at the same time, the docking block 11 on the lower surface of the center plate 10 is inserted into the top docking groove 7 of the top plate 9, forming a three-stage linkage of "center plate 10-top plate 9-valve body rod 19"; drive the valve body rod 19: continuously press the center plate 10 and the top plate 9 (keeping the docking), and rotate the center plate 10 synchronously. The torque is transmitted sequentially through the center rod 13 → valve body rod 19 to realize the opening and closing of the gate valve (rotation angle 0-90°, corresponding to the valve plate being fully closed-fully open); reset and lock: after the operation is completed, rotate the center plate 10 and the top plate 9 in the opposite direction, and the docking block 11 is removed. Connecting slot 7; Release the press, the first and second springs 20 reset the top rod 14 and the center rod 13; Rotate the adjusting screw 4 in the opposite direction, the locking block 17 protrudes and gets into the locking slot 16, the bearing plate 6 is relocked; Unauthorized operation dilemma (non-staff members), chaotic steps: If the center plate 10 is operated first, because the top plate 9 is not pressed, the center rod 13 cannot move down to the valve body rod 19 connecting slot 7 (30mm gap), and free rotation is ineffective; If the adjusting screw 4 is unlocked first, because the top rod 14 is not connected to the bearing plate 6, rotating the center plate 10 still cannot drive the valve body rod 19; Failure of fit: The structure of the connecting block 11 and the connecting slot 7 needs to be precisely aligned, and the probability of alignment is low if non-staff members blindly rotate; Even if they are accidentally aligned, they do not know that they need to be pressed continuously (the spring reset causes the connecting block 11 to fail to move down to the center plate 13). (Disconnection) prevents torque transmission; Anti-theft reliability: Multi-level operation sequence (top plate 9 docking → unlocking → center rod 13 docking) + special matching structure (docking block 11, locking protrusion) reduces the success rate of unauthorized opening, far superior to traditional gate valves; Ease of operation: Operators follow the standard procedures, and the spring reset and guide structure ensure smooth operation (no jamming), adapting to frequent opening and closing scenarios; Environmental adaptability: Protective cover 3 sealing + stainless steel components can withstand outdoor wind, rain, and corrosion, extending the maintenance cycle; Through the collaborative design of "physical isolation + multi-level linkage + sequence constraint + special matching", this anti-theft gate valve effectively solves the problem of traditional gate valves being easily opened by unauthorized means, and is especially suitable for the security protection of key facilities such as municipal water supply and gas pipelines.

[0039] The operating principle of the anti-theft gate valve in this embodiment is as follows: During use, personnel can connect the gate valve body 1 to the corresponding pipeline through the flanges at both ends, thereby facilitating the control of the conveyed medium. When the gate valve body 1 is in use, a protective cover 3 is installed on the outer periphery of the valve body stem 19, which controls the opening and closing of the valve plate. The protective cover 3 separates the adjustment area from the external structure, thereby preventing unauthorized personnel from operating the valve body stem 19, thus improving the anti-theft performance and protection effect of the structure. Moreover, the protective cover 3 has multiple sets of protective measures inside, and the multiple structures have a clear sequence. Personnel can operate them one by one according to the operating procedures to open the valve body. Unauthorized personnel, lacking the operating procedures, do not understand the sequence of structures and therefore cannot open the valve body, thus achieving a better protection effect. When the gate valve needs to be opened, the operator first needs to press the top plate 9, causing it to move the top rod 14 downwards. This allows the mating block 11 on the surface of the top rod 14 to contact the surface of the bearing plate 6. Simultaneously, the operator needs to rotate the pressed top plate 9, causing it to rotate the top rod 14 along the bearing plate 6. When the mating block 11 on its surface aligns with the mating groove 7 on the surface of the bearing plate 6, the top rod 14 can move further downwards and insert into the mating groove 7, thus connecting the top rod 14 with the bearing plate 6. At this point, the rotation of the top rod 14 can drive the bearing plate 6 to move. This involves the top plate 9, the center plate 10, and the bearing plate 6. If the operator does not press the top plate 9 first and directly operates the other structures, the top rod 14 will spin freely and will not be able to drive the bearing plate 6 synchronously.Since the central disc 10 is mounted on the top disc 9, it will spin freely if the top disc 9 is not pressed. Conversely, if the central disc 10 is pressed, its downward movement is restricted by the support of the top disc 9, preventing it from connecting with the valve stem 19 and thus hindering its operation. In summary, the above structure exhibits a clear sequential operation, making it difficult for non-operators to master the opening mechanism, thereby ensuring the structure's anti-theft capability. After the top rod 14 connects with the supporting disc 6, the overall height of the top disc 9 decreases, allowing personnel to easily access the valve. The center disc 10 is pressed down, causing the center rod 13 to move downwards, allowing it to land in the mating groove 7 at the top of the valve body rod 19. Then, pressing and rotating the center disc 10 simultaneously inserts the mating block 11 on its surface into the mating groove 7 on the top disc 9, and the mating block 11 on the surface of the center rod 13 into the mating groove 7 on the surface of the valve body rod 19. This achieves coordinated operation of multiple structures. The valve body rod 19 can be driven by pressing and rotating simultaneously. Meanwhile, the top rod 14 is linked to the bearing disc 6, and the bearing disc 6 is limited by the adjusting screw 4 and the locking block 17. The adjusting screw 4 needs to be rotated after the structural linkage is completed, so that the bearing plate 6 is unrestrained and can rotate normally to drive the valve body rod 19, thereby enabling the valve body to be used. Since there is a clear step prefix when the adjusting screw 4 is opened, it can not only confuse unauthorized operators but also prevent the bearing plate 6 from aligning with the top rod 14 after being opened first. Conversely, if the structure is opened by unauthorized personnel during operation, simply returning the adjusting screw 4 to its original position will cause the locking block 17 to move inward, applying pressure and limiting to the bearing plate 6, and then pressing down to rotate the top rod 14 will allow the valve body to be activated. Once the two are realigned, the operator can then release the adjusting screw 4 to a certain extent, causing the bearing plate 6 to rotate. Continuing to rotate the adjusting screw 4 while simultaneously rotating the top rod 14 allows the locking block 17 on the surface of the adjusting screw 4 to move further inward. The operator can clearly feel the structure continuing to rotate, indicating that the locking block 17 is aligned with the locking groove 16, facilitating subsequent operations. After the valve body is used, the operator only needs to reverse the above steps to achieve the repositioning and loosening of the structure, thus preventing unauthorized use and improving the overall anti-theft effect. The device has the advantages of good anti-theft effect, low difficulty for non-professionals to operate, and high practicality.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A theft-proof gate valve comprising a gate valve body (1) and a protective cover (3), characterized in that: A protective cover (3) is fitted around the valve body rod (19) on the surface of the gate valve body (1), and the protective cover (3) is welded to the surface of the gate valve body (1). A top rod (14) is rotatably connected to the top center of the protective cover (3). A top plate (9) is installed on the top of the top rod (14). A center rod (13) and a center plate (10) are rotatably connected together between the top plate (9) and the top rod (14), and the center plate (10) is fixed to the center rod (13). A bearing plate (6) is installed below the top rod (14) inside the protective cover (3). A base plate (18) is installed at the bottom center of the bearing plate (6). 8) The bottom is rotatably connected to the valve body rod (19) via a support rod (8). The valve body rod (19), the top center of the bearing plate (6), and the top center of the top plate (9) are all provided with docking grooves (7). The bottom center of the docking groove (7) on the surface of the valve body rod (19) is provided with an ejection groove (2). A second spring (20) is installed inside the ejection groove (2). Several sets of adjusting screws (4) are installed around the surface of the protective cover (3). One end of the adjusting screw (4) is rotatably connected to a locking block (17). One end of the locking block (17) is located on the surface of the bearing plate (6) and is provided with a corresponding locking groove (16).

2. A theft-proof gate valve according to claim 1, characterized in that: A mating block (11) is installed at the bottom of the top rod (14), the surface of the center plate (10), and the bottom of the center rod (13).

3. A theft-proof gate valve according to claim 1, characterized in that: Several sets of slide rods (5) are symmetrically installed on the outer periphery of the adjusting screw (4) at the position inside the protective cover (3), and the slide rods (5) are slidably connected to the locking block (17).

4. The theft-proof gate valve according to claim 1, wherein: The top rod (14) is fitted with a first spring (12) on its outer periphery, and the bottom end of the first spring (12) is fixed to the surface of the protective cover (3).

5. The theft-proof gate valve according to claim 1, wherein: The locking block (17) has an arc-shaped structure and a protrusion in the middle of the structure.

6. A theft-proof gate valve according to claim 1, characterized in that: The top of the valve body rod (19) is surrounded by a circular groove for the support rod (8) to rotate.

7. A theft-proof gate valve according to claim 1, characterized in that: The protective cover (3) has an anti-theft cavity (15) inside.

8. A theft-proof gate valve according to claim 1, characterized in that: The bearing plate (6) has a through hole in the middle position for the movement of the center rod (13).

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