A gate valve testing equipment

Abstract

The present invention provides a gate valve testing device, wherein a testing device with a testing cavity is arranged on a workbench, a process valve stem is slidably inserted into the testing cavity, a gate plate to be tested is fixed at the front end of the process valve stem, and the workbench, driven by a first driving component, drives the testing cavity and the process valve stem to move toward the valve body to be tested, so that the testing cavity is connected with the middle cavity of the valve body to be tested, and a sealing arrangement is arranged at the connection, the process valve stem pushes the gate plate to be tested to abut against the seat ring sealing surface of the valve body to be tested, and a testing fluid is injected into the testing cavity to detect the sealing performance of the gate plate to be tested and the valve body to be tested, when a sealing problem occurs, the gate plate to be tested or the seat ring sealing surface can be repaired in time, and when there is no sealing problem, the group of gate plates and the valve body can be transported together to the next process for assembly, so as to avoid disassembling the valve body for repair when a sealing problem occurs after the assembly is completed, thereby improving the yield rate of the valve body assembly and reducing the repair cost.

Description

Technical Field

[0001] The invention belongs to the technical field of valve equipment, and in particular relates to a gate valve detection device. Background Art

[0002] The gate valve, also known as the gate valve, is a widely used valve. The gate valve refers to a valve whose closing part (gate) moves in the vertical direction along the axis of the channel. It is mainly used to cut off the medium in the pipeline, that is, it is used fully open or fully closed. Its closing principle is that the sealing surface of the gate and the sealing surface of the seat ring of the valve seat are highly smooth, flat and consistent, and fit each other to prevent the medium from flowing through. Generally, the gate valve has two sealing pairs, which adds some difficulties to processing, grinding and maintenance. The gate valve is sealed by contact between the valve seat and the gate, and the sealing surface is usually welded with metal materials to increase wear resistance.

[0003] In the prior art, the sealing performance of the gate valve is usually tested after the gate is installed in the valve body. If there are problems such as poor welding between the valve body and the valve seat, casting defects of the gate, and poor grinding of the sealing surface, the entire valve needs to be disassembled and repaired, which is a complicated process and has a high cost. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that when the existing gate valve is assembled and subjected to sealing inspection, if a sealing problem occurs, the repair work is complicated and tedious, and the cost is high.

[0005] To this end, the present invention provides a gate valve detection device, comprising

[0006] A workbench, disposed on the base;

[0007] A detection device, arranged on the workbench, having a detection cavity;

[0008] A process valve stem is axially perpendicular to the workbench and is slidably disposed in the detection cavity; the front end of the process valve stem is suitable for fixing the gate to be detected;

[0009] A first driving assembly, slidably disposed between the base and the workbench;

[0010] Driven by the first driving assembly, the detection cavity is adapted to communicate with the middle cavity of the valve body to be detected, and the opening end surface of the detection cavity is sealed against the opening of the middle cavity of the valve body to be detected;

[0011] The process valve stem is suitable for moving toward the inner part of the middle cavity of the valve body to be tested and abutting the gate plate to be tested against the seat ring sealing surface of the valve body to be tested;

[0012] The detection cavity is suitable for letting detection fluid flow into it.

[0013] The detection device comprises:

[0014] A fixed plate, fixed to the workbench; at least two fluid channels communicating with the outside are provided on the fixed plate;

[0015] A blind plate is sealingly arranged on the fixed plate; the detection cavity is opened on the blind plate, the process valve stem is slidingly arranged on the fixed plate and the front end is located in the detection cavity;

[0016] Any of the fluid channels is connected to the detection chamber.

[0017] Also includes:

[0018] A fixing seat is installed at the front end of the process valve stem; a left-right symmetrical fixing part is arranged on the fixing seat; any one of the fixing parts is suitable for fixing the gate to be detected.

[0019] Also includes:

[0020] A first guide assembly is arranged between the first drive assembly and the workbench; the first guide assembly comprises:

[0021] At least one first guide rail is arranged on the base along the direction in which the process valve stem moves toward the valve body to be inspected;

[0022] At least one first sliding block is fixed on the workbench; the first sliding block is slidably arranged on the first guide rail.

[0023] Also includes:

[0024] A connecting plate is arranged between the first sliding block and the workbench.

[0025] Also includes:

[0026] A second driver is arranged on the workbench; a driving end of the second driver is connected to the process valve stem.

[0027] Also includes at least two limit assemblies;

[0028] Any of the limiter components comprises:

[0029] A third driver is mounted on the workbench;

[0030] A limiting portion, fixed to the driving end of the third driver; under the driving of the third driver, the limiting portion is suitable for moving along the extending direction of the process valve stem;

[0031] The limiting portion is suitable for pressing and limiting the opening of the middle cavity of the valve body to be detected.

[0032] The limiting components are symmetrically arranged on both sides of the process valve stem.

[0033] Also includes:

[0034] At least one fourth driving assembly is adapted to drive any of the limit assemblies to move in a direction perpendicular to the extension of the process valve stem.

[0035] Also includes at least two sets of second guide assemblies; any of the second guide assemblies includes:

[0036] At least one second guide rail, corresponding to the limit assembly and perpendicular to the extension direction of the process valve stem, is arranged on the workbench on both sides of the process valve stem;

[0037] at least one second slider, slidably disposed on the second guide rail; the third driver corresponds to the second slider one by one and is fixed on the second slider;

[0038] The fourth driving assembly comprises:

[0039] Fourth Drive;

[0040] A driving disk is coaxially arranged with the process valve stem and rotatably mounted on the workbench; a driving end of the fourth driver is hingedly arranged on the driving disk;

[0041] A connecting rod is arranged corresponding to the limiting assembly one by one; one end of any of the connecting rods is fixed to the second slider, and the other end is fixed to the driving disk; the two connecting rods are arranged symmetrically about the center of the driving disk;

[0042] Driven by the fourth driver, the limiting assembly is suitable for synchronous movement.

[0043] Also includes:

[0044] A controller is electrically connected to the first drive component, the second drive, the third drive and the fourth drive.

[0045] The technical solution of the present invention has the following advantages:

[0046] 1. A gate valve testing device provided by the present invention comprises a testing device arranged on a workbench, a testing cavity is provided on the testing device, a process valve stem is slidably arranged in the testing cavity, a gate plate to be tested is fixed at the front end of the process valve stem, and the workbench, driven by a first driving component, drives the testing cavity and the process valve stem to move toward the valve body to be tested, so that the testing cavity is connected with the middle cavity of the valve body to be tested, and a sealing arrangement is arranged at the connection, and the process valve stem drives the gate plate to continue to move toward the inside of the middle cavity of the valve body to be tested, so that the gate plate to be tested abuts against the sealing surface of the seat ring of the valve body to be tested, and a testing fluid is injected into the testing cavity to detect the sealing performance of the fitting between the gate plate to be tested and the valve body to be tested, and when a sealing problem occurs, the gate plate to be tested or the sealing surface of the seat ring can be repaired in time, and when there is no sealing problem, the group of gate plates and the valve body can be transported together to the next process for assembly, so as to avoid disassembling the valve body for repair when a sealing problem occurs after the assembly is completed, thereby improving the yield rate of the valve body assembly and reducing the repair cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 The structure diagram of the gate valve detection device of the present invention is shown in FIG. Figure 1 ;

[0049] Figure 2 The structure diagram of the gate valve detection device of the present invention is shown in FIG. Figure 2 ;

[0050] Figure 3 It is a partially enlarged schematic diagram of a workbench in the gate valve detection equipment of the present invention;

[0051] Figure 4 Schematic diagram of the detection process of the gate valve detection device of the present invention Figure 1 ;

[0052] Figure 5 Schematic diagram of the detection process of the gate valve detection device of the present invention Figure 2 ;

[0053] Figure 6 Schematic diagram of the detection process of the gate valve detection device of the present invention Figure 3 .

[0054] Description of reference numerals:

[0055] 10-base; 20-assembly line; 30-controller; 11-connecting plate; 12-gate to be tested; 13-valve body to be tested; 131-flange; 132-guide rib; 133-valve seat;

[0056] 1- Workbench;

[0057] 2-detection device; 21-fixed plate; 211-fluid channel; 22-blind plate; 221-detection chamber;

[0058] 3-process valve stem; 31-fixed seat;

[0059] 4-first driving assembly; 41-first driver; 42-support frame;

[0060] 5-first guide assembly; 51-first guide rail; 52-first slider;

[0061] 6- Second drive;

[0062] 7-limiting assembly; 71-third driver; 72-limiting part;

[0063] 8- fourth driving assembly; 81- driving plate; 82- connecting rod;

[0064] 9-second guide assembly; 91-second guide rail; 92-second slider. DETAILED DESCRIPTION

[0065] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] Example 1

[0069] This embodiment provides a gate valve detection device, such as Figure 1 As shown, it includes a base 10, a workbench 1, a detection device 2, a process valve stem 3 and a first drive assembly 4. The base 10 of the detection equipment is arranged on one side of the assembly line 20 for conveying the valve body 13 to be detected, and the first drive assembly 4 is installed on the base 10. The first drive assembly 4 includes a first driver 41 and a support frame 42. The support frame 42 is vertically installed on the base 10. The workbench 1 is a rectangular flat plate structure, which is extended horizontally and installed on the support frame 42. The first driver 41 is installed on the top of the support frame 42, which is suitable for pushing the workbench 1 to move up and down in the vertical direction.

[0070] like Figure 2 As shown, a first guide assembly 5 is provided between the workbench 1 and the support frame 42, and the first guide assembly 5 includes at least one first guide rail 51 extending in the vertical direction and provided on the support frame 42, and at least one first slider 52 slidably provided on the first guide rail 51. In this embodiment, two first guide rails 51 are provided, distributed on both sides of the support frame 42, and two first sliders 52 are provided on each first guide rail 51. A connecting plate 11 is provided between the first slider 52 and the workbench 1, and the connecting plate 11 is a rectangular flat plate structure, as shown in FIG. Figure 2 As shown, the connecting plate 11 and the workbench 1 form an L-shaped structure.

[0071] A detection device 2 is arranged on the workbench 1, and the detection device 2 comprises a fixing plate 21 and a blind plate 22. Figures 4 to 6 As shown in any of the accompanying drawings, the fixed plate 21 is fixed on the lower end surface of the workbench 1, the blind plate 22 is sealed and fixed on the lower end surface of the fixed plate 21, and a detection cavity 221 is provided on the blind plate 22. The opening of the detection cavity 221 is located on the lower end surface of the blind plate 22, that is, the opening end surface of the detection cavity 221 is the lower end surface of the blind plate 22. The process valve stem 3 extends in the vertical direction and is slidably penetrated from top to bottom on the fixed plate 21, and its front end is located in the detection cavity 221 of the blind plate 22. At least two fluid channels 211 communicating with the outside are provided on the fixed plate 21. In this embodiment, two fluid channels 211 are provided. Figures 4 to 6Only one fluid channel 211 is shown, wherein an exhaust valve (not shown) is provided in one fluid channel 211, and the other fluid channel 211 is connected to a fluid source of the detection fluid, and the detection fluid is pumped into the detection chamber 221 by a low-pressure pump.

[0072] Driven by the first driver 41, the open end face of the detection cavity 221 moves downward and abuts against the opening of the middle cavity of the valve body 13 to be detected on the lower assembly line. The opening of the middle cavity of the valve body 13 to be detected is a fixed flange 131. The flange surface is sealed against the open end face of the detection cavity 221. The detection cavity 221 is connected to the middle cavity of the valve body 13 to be detected. The opening size of the detection cavity 221 is equal to or slightly smaller than the opening size of the middle cavity. According to the different specifications of the valve body 13 to be detected and the gate plate 12 to be detected, the blind plate 22 matching them can be replaced, and the specifications of the blind plate 22 can be defined according to the opening size of the detection cavity 221.

[0073] like Figures 4 to 6 As shown in any of the accompanying drawings, a second driver 6 is arranged on the upper end surface of the workbench 1, and the driving end of the second driver 6 is connected to the process valve stem 3. The second driver 6 drives the process valve stem 3 to reciprocate in the vertical direction. In this embodiment, the second driver 6 adopts an oil cylinder, and a fixed seat 31 is arranged at the front end of the process valve stem 3 located in the detection chamber 221. Left-right symmetrical fixing parts are arranged on both sides of the fixed seat 31, and a gate plate 12 to be detected is fixed on each fixing part. The fixed seat 31 can be of different specifications, that is, according to the different specifications of the gate plate 12 to be detected and the valve body 13 to be detected, the matching fixed seat 31 can be replaced for easy detection.

[0074] like Figure 3 As shown, at least two limit assemblies 7 are also provided on the workbench 1. In this embodiment, two limit assemblies 7 are provided, symmetrically distributed on both sides of the process valve stem 3. Any limit assembly 7 includes a third driver 71 and a limit portion 72. The third driver 71 adopts an oil cylinder or an air cylinder. The limit portion 72 is fixed to the driving end of the third driver 71 through a connecting rod. The connecting rod is passed through the workbench 1. The limit portion 72 is located below the workbench 1. Driven by the third driver 71, the limit portion 72 moves up and down in the vertical direction. The limit portion 72 adopts a hook claw, such as Figure 2 As shown, the hook claw is a trapezoidal structure as a whole, and is suitable for hooking on the flange 131 at the opening of the valve body 13 to be detected, so as to firmly fix the valve body 13 to be detected and the detection device 2.

[0075] In this embodiment, a fourth driving assembly 8 is further provided to drive any of the limiting assemblies 7 to move in the horizontal direction, so that the hook claws can clamp the flange 131. Figure 3As shown, a group of second guide assemblies 9 are respectively arranged on the workbench 1 on both sides of the process valve stem 3, and the second guide assemblies 9 are arranged corresponding to the limit assemblies 7. Any group of second guide assemblies 9 includes at least one second guide rail 91, which is arranged in a horizontal direction on the workbench 1, and at least one second slider 92, which is slidably set on the second guide rail 91. Symmetrical long waist holes (not shown in the figure) are opened on the workbench 1 on both sides of the process valve stem 3. In this embodiment, two second guide rails 91 are arranged in any group of second guide assemblies 9, and the two second guide rails 91 are symmetrically distributed on both sides of the long waist holes. The second slider 92 is slidably set in the two second guide rails 91 on both sides, and the third driver 71 is fixed on the second slider 92, and the connecting rod is set through the long waist hole.

[0076] The fourth drive assembly 8 includes a fourth driver (not shown in the figure), a drive plate 81 and a connecting rod 82. Figure 3 As shown, the driving disk 81 is coaxially arranged with the process valve stem 3 and rotatably mounted on the workbench 1. The driving end of the fourth driver is hingedly arranged on the driving disk 81. The fourth driver can be a push rod cylinder, etc., depending on specific needs. The connecting rod 82 is arranged corresponding to the limit assembly 7. One end of any connecting rod 82 is fixed on the second slider 92, and the other end is fixed on the driving disk 81. The two connecting rods 82 are arranged symmetrically about the center of the driving disk 81. Driven by the fourth driver, the limit assemblies 7 on both sides are suitable for synchronous movement.

[0077] A controller 30 is also provided on one side of the assembly line 20. The controller 30 is electrically connected to the first driver 41, the second driver 6, the third driver 71, the fourth driver, the exhaust valve of the fluid channel, the low-pressure pump (not shown in the figure) for conveying the test fluid, and the high-pressure pump (not shown in the figure) for maintaining the pressure. The controller 30 also has conventional settings such as an indicator light and a buzzer.

[0078] The working process of the gate valve detection device provided in this embodiment is as follows:

[0079] The staff pre-installs the blind plate 22 of appropriate specifications and the fixing seat 31 on the process valve stem 3 according to the specifications of the valve body 13 and the gate plate 12 to be tested. When the valve body 13 to be tested is transported to the set position below the workbench 1 along the assembly line 20, the two gate plates 12 to be tested are symmetrically installed on the fixing seat 31, and the preset pump test program is selected (the pump test program sets the pressure value and pressure holding time according to the specifications and pound levels).

[0080] Figures 4 to 6The diagrams illustrate the movement process of the process valve stem 3 driving the gate plate 12 to be tested. The first driver 41 is turned on by the controller 30 to drive the workbench 1 to move downward until the open end face of the detection cavity 221 abuts against the flange 131 of the valve body 13 to be tested. Then the second driver 6 is started to push the process valve stem 3 to drive the gate plate 12 to be tested to continue to move into the middle cavity of the valve body 13 to be tested. A matching groove is formed between the two gate plates 12 to be tested. The matching groove moves along the raised guide rib 132 on the inner wall of the middle cavity of the valve body 13 to be tested, so that the gate plate 12 to be tested abuts against the seat ring sealing surface of the valve seat 133.

[0081] Start the third driver 71 to move the hook downward to below the horizontal plane where the flange 131 is located, and then start the fourth driver. The fourth driver pushes the driving disk 81 to rotate, driving the connecting rod 82. The connecting rod 82 pulls the second slider 92 toward the process valve stem 3, and at the same time, the lower hook moves horizontally to below the flange 131. Start the third driver 71 again to drive the hook to move upward, and the hooks on both sides synchronously limit and hook the valve body 13 to be inspected.

[0082] Then inject the test fluid through the fluid channel to test the leak tightness:

[0083] 1. Low-pressure air sealing test (the test fluid is gas): Inflate the middle cavity through the fluid channel 211, automatically pressurize to the test pressure, maintain the pressure, and the operator sprays soapy water on the sealing surfaces on both sides to observe whether there are bubbles escaping. After the pressure holding time is reached, the worker presses the pressure relief button to release the pressure of the equipment. Enter the next procedure of high-pressure water sealing test.

[0084] 2. High-pressure water sealing test (the test fluid is liquid): water is filled into the middle cavity through one fluid channel 211, and the exhaust valve of the other fluid channel 211 is automatically opened until the air is completely exhausted. After the cavity is filled with water, the exhaust valve is closed, the low-pressure water pump stops automatically, and the high-pressure pump is started. When the test medium reaches the pressure value required for the test, the high-pressure pump stops automatically, and the system automatically enters the pressure holding timing state. When the pressure holding timing ends, the pressure holding timing end indicator lights up, and the buzzer sounds to remind you.

[0085] Finally, the pressure is released and the water is drained, and the test is finished. The process valve stem 3 pulls back the gate plate 12 to be tested, releases the hook, moves radially into place, and the workbench 1 moves up to the initial position. The pump tester operates the assembly line 20 completion button, and the valve body 13 to be tested and the gate plate 12 to be tested automatically flow to the next process with the tray.

[0086] As a first replaceable implementation of Example 1, the limit assembly 7, the fourth drive assembly 8 and the second guide assembly 9 may not be set, and the blind plate 22 and the gate plate to be inspected 12 are only driven by the first driver 41 and the second driver 6 to press against the valve body to be inspected 13, and the valve body to be inspected 13 is firmly fixed on the assembly line 20.

[0087] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A gate valve detection device, characterized in that: include: A workbench (1) is arranged on a base (10); A detection device (2), arranged on the workbench (1); comprising a detection chamber (221); A process valve stem (3) is axially perpendicular to the workbench (1) and is slidably disposed in the detection chamber (221); a front end of the process valve stem (3) is suitable for fixing a gate plate (12) to be detected; A first driving assembly (4) is slidably disposed between the base (10) and the workbench (1); Driven by the first drive assembly (4), the detection cavity (221) is adapted to communicate with the middle cavity of the valve body (13) to be detected, and the opening end surface of the detection cavity (221) is sealed against the opening of the middle cavity of the valve body (13) to be detected; The process valve stem (3) is suitable for moving toward the inner cavity of the valve body (13) to be tested and for bringing the gate plate (12) to be tested into contact with the seat ring sealing surface of the valve body (13) to be tested; The detection cavity (221) is suitable for allowing detection fluid to flow into it.

2. The gate valve detection equipment according to claim 1, characterized in that: The detection device (2) comprises: A fixed plate (21) fixed on the workbench (1); at least two fluid channels (211) communicating with the outside are provided on the fixed plate; A blind plate (22) is sealingly arranged on the fixed plate (21); the detection cavity (221) is opened on the blind plate (22); the process valve stem (3) is slidably arranged on the fixed plate (21) and the front end is located in the detection cavity (221); Any of the fluid channels (211) is connected to the detection chamber (221).

3. The gate valve detection equipment according to claim 2, characterized in that: Also includes: A fixing seat (31) mounted on the front end of the process valve stem (3); The fixing seat (31) is provided with a left-right symmetrical fixing portion; Any of the fixing parts is suitable for fixing the gate plate (12) to be detected.

4. The gate valve detection device according to claim 3, characterized in that: Also includes: A first guide assembly (5) is arranged between the first drive assembly (4) and the workbench (1); the first guide assembly (5) comprises: At least one first guide rail (51) is arranged on the base (10) along the direction in which the process valve stem (3) moves toward the valve body (13) to be inspected; At least one first sliding block (52) is fixed on the workbench (1); the first sliding block (52) is slidably arranged on the first guide rail (51).

5. The gate valve detection device according to claim 4, characterized in that: Also includes: A connecting plate (11) is arranged between the first sliding block (52) and the workbench (1).

6. The gate valve detection device according to claim 5, characterized in that: Also includes: A second driver (6) is arranged on the workbench (1); a driving end of the second driver (6) is connected to the process valve stem (3).

7. The gate valve detection device according to claim 6, characterized in that: It also includes at least two limit assemblies (7); Any of the limiting components (7) comprises: A third driver (71) mounted on the workbench (1); a limiting portion (72) fixed to a driving end of the third driver (71); under the drive of the third driver (71), the limiting portion (72) is adapted to move along an extension direction of the process valve stem (3); The limiting portion (72) is suitable for pressing and limiting the opening of the middle cavity of the valve body (13) to be detected.

8. The gate valve detection device according to claim 7, characterized in that: The limiting components (7) are symmetrically arranged on both sides of the process valve stem (3).

9. The gate valve detection device according to claim 8, characterized in that: Also includes: At least one fourth driving assembly (8) is suitable for driving any of the limit assemblies (7) to move in a direction perpendicular to the extension of the process valve stem (3).

10. The gate valve detection device according to claim 9, characterized in that: It also includes at least two groups of second guide assemblies (9); any of the second guide assemblies (9) includes: at least one second guide rail (91), corresponding to the limit assembly (7) and arranged perpendicular to the extension direction of the process valve stem (3) on the workbench (1) at one side of the process valve stem (3); At least one second slider (92) is slidably arranged on the second guide rail (91); the third driver (71) corresponds to the second slider (92) one by one and is fixed on the second slider (92).

11. The gate valve detection device according to claim 10, characterized in that: The fourth driving assembly (8) comprises: Fourth Drive; A drive disk (81) is coaxially arranged with the process valve stem (3) and rotatably mounted on the workbench (1); a drive end of the fourth driver is hingedly arranged on the drive disk (81); A connecting rod (82) is arranged one-to-one corresponding to the limiting assembly (7); one end of any connecting rod (82) is fixed to the second slider (92), and the other end is fixed to the driving disk (81); the two connecting rods (82) are arranged in a centrally symmetrical manner with respect to the center of the driving disk (81); Driven by the fourth driver, the limiting assembly (7) is suitable for synchronous movement.

12. The gate valve detection device according to any one of claims 1 to 11, characterized in that: Also includes: The controller (30) is electrically connected to the first drive assembly (4), the second drive (6), the third drive (71) and the fourth drive.

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