High-precision plug valve multi-stage sealing pressure test device

Abstract

The invention discloses a high-precision plug valve multi-stage sealing pressure test device, and relates to the technical field of plug valve sealing pressure test, the high-precision plug valve multi-stage sealing pressure test device comprises a base, the top end of the base is fixedly provided with a rack, and a pressure test mechanism is arranged between a console and a fixed seat; a positioning disc is fixedly installed on the inner side face of the installation disc, and a sealing mechanism is arranged between the protection plate and the positioning disc. A plug valve body is movably installed on the inner side face of the fixing base, and a clamping mechanism is arranged between the plug valve body and the fixing base. According to the high-precision plug valve multi-stage sealing performance pressure test device, gas is injected through the input port, so that the gas circulates through the interior of the transmission pipeline, the gas is transmitted to a groove hole formed in a sealing disc through an induction assembly, and the sealing disc abuts against the inner side face of a communicating pipe, so that the sealing performance of a plug valve body is detected; when gas leakage happens to the plug valve body, the sensing assembly can make a sound, and therefore the sealing effect of the plug valve body is detected.

Description

Technical Field

[0001] The invention relates to the technical field of plug valve sealing pressure testing, in particular to a high-precision plug valve multi-stage sealing pressure testing device. Background Art

[0002] The plug valve is a rotary valve with a closing piece or a plunger shape. The shape of its valve plug can be cylindrical or conical. These shapes make the structure of the plug valve light and suitable as a valve for cutting off and connecting media and for diversion. The plug valve needs to be tested for sealing after production or before use to ensure reliability after installation.

[0003] However, the existing plug valve pressure testing device can only be placed on the upper surface of the lower pressure plate by relying on friction when in use, so that when the upper pressure plate squeezes it, the plug valve is prone to deflection.

[0004] In order to solve the above-mentioned defects, in the prior art, a Chinese patent with publication number CN219064868U discloses a plug valve pressure testing device, including a bracket, a lower base plate, an upper top plate, a lower pressure plate and a fixing device, the fixing device including a threaded rod, a handle, a rotating ball, a clamping panel, a moving component and a protective component, the threaded rod is threadedly connected to the bracket, the handle is fixedly connected to the threaded rod, the rotating ball is rotatably connected to the threaded rod, the clamping panel is fixedly connected to the rotating ball, and the clamping panel is moved on the lower pressure plate through the moving component, the plug valve is placed on the lower pressure plate, the threaded rod is rotated by the handle, and the threaded rod is driven by the thread of the bracket to drive the clamping panel to move toward the plug valve through the rotating ball until the clamping panel abuts against the outer surface of the plug valve, thereby clamping and fixing the plug valve, so that when the upper pressure plate squeezes the plug valve, the plug valve can maintain a stable state, thereby ensuring the accuracy of the pressure test.

[0005] And in the prior art, a Chinese patent with publication number CN219714677U discloses a multi-station pressure test bench for a plug valve, comprising a frame, a clamping part for clamping the plug valve is provided on the frame, the clamping part is arranged at both ends of the frame, the clamping part comprises a plurality of fixed clamping ends and a plurality of movable clamping ends, the number of the fixed clamping ends matches that of the movable clamping ends, and the fixed clamping ends are provided with an elastic component for popping out the plug valve and an air intake hole for air intake; a detection slide, the detection slide is slidably connected to the frame, and a plurality of mounting plates are provided on the detection slide, and a plurality of slide rails are provided on the mounting plate, and the slide rails are used to install the plug valve; wherein the number of slide rails on each mounting plate matches the number of fixed clamping ends; the clamping part alternately clamps and detects the plug valve on the detection slide, and the alternate detection of the plug valve is realized through the detection slide, so that disassembly and detection are carried out simultaneously, which reduces the time for disassembly and assembly of the valve and improves the detection efficiency.

[0006] The above-mentioned device utilizes a clamping panel to clamp the plug valve during use. However, in the above-mentioned device, the plug valve is only tested for air tightness when clamped. The test is too single and the test result is prone to errors, resulting in hidden dangers in the plug valve, thereby affecting the quality of the plug valve. Summary of the invention

[0007] The object of the present invention is to provide a high-precision multi-stage sealing pressure testing device for plug valves, so as to solve the problem in the above background technology that errors in detection are prone to occur, resulting in hidden dangers of plug valves.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision plug valve multi-stage sealing pressure testing device, comprising a base, a frame is fixedly installed on the top of the base, a control console is fixedly installed on the top of the base, a fixed seat is fixedly installed on the top of the base, a protection box is fixedly installed on the top of the fixed seat, and a pressure testing mechanism for auxiliary detection is arranged between the console and the fixed seat; a protective plate is movably abutted on the top of the base, a mounting disk is fixedly installed on the outer surface of the protective plate, a positioning disk is fixedly installed on the inner side surface of the mounting disk, and a sealing mechanism that is easy to replace is arranged between the protective plate and the positioning disk; an input port is fixedly installed on the top of the frame, an air pump is fixedly installed on the top of the frame, a plug valve body is movably installed on the inner side surface of the fixed seat, and a clamping mechanism for auxiliary positioning is arranged between the plug valve body and the fixed seat.

[0009] Furthermore, an output port is fixedly installed on the top of the frame, a transmission pipe is fixedly installed on the outer surface of the frame, the transmission pipe is fixedly installed on the outer surface of the sensing component, and the sensing component is fixedly installed on the outer surface of the protective plate.

[0010] Furthermore, the pressure testing mechanism includes a hydraulic pump, which is fixedly mounted on the inner end of the frame, a telescopic rod is movably mounted on the outer surface of the hydraulic pump, a protective plate is fixedly mounted on the outer surface of the telescopic rod, and the telescopic rod and the protective plate form a telescopic structure.

[0011] Furthermore, a positioning rod is movably mounted on the inner side of the protective plate, the positioning rod is fixedly mounted on the outer surface of the frame, a supporting rod is fixedly mounted on the inner side of the frame, and a fixing seat is fixedly mounted on the outer surface of the supporting rod.

[0012] Furthermore, the sealing mechanism includes a limit block, which is fixedly mounted on the outer surface of the positioning plate, a locking plate is movably mounted on the outer surface of the limit block, a sealing plate is fixedly mounted on the outer surface of the locking plate, and the locking plate movably abuts against the outer surface of the positioning plate.

[0013] Furthermore, the sealing disk movably abuts against the inner side of the connecting pipe, the connecting pipe is fixedly installed on the outer surface of the plug valve body, the inner side of the plug valve body is movably mounted with a sealing valve core, and the outer surface of the sealing valve core is movably mounted with a rotating handle.

[0014] Furthermore, a rotating rod is movably mounted on the inner side of the protection box, a manual rocker is fixedly mounted on the top of the rotating rod, a first bevel gear is fixedly mounted on the outer surface of the rotating rod, and the first bevel gear is meshingly connected with a second bevel gear.

[0015] Furthermore, a spiral rod is fixedly mounted on the inner side surface of the second bevel gear, a movable rod is threadedly mounted on the outer surface of the spiral rod, a limiting plate is fixedly mounted on the outer surface of the movable rod, and the spiral rod and the movable rod form a telescopic structure.

[0016] Furthermore, the clamping mechanism includes a buffer spring, which is fixedly mounted on the inner side of the movable rod, a pressing rod is fixedly mounted on the outer surface of the buffer spring, a clamping block is fixedly mounted on the outer surface of the pressing rod, and the buffer spring and the pressing rod form a telescopic structure.

[0017] Furthermore, the clamping block is movably abutted against the outer surface of the plug valve body, a limiting rod is fixedly installed on the inner side surface of the clamping block, and the limiting rod is movably installed on the inner side surface of the limiting plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) Inject gas through the input port so that the gas circulates through the inside of the transmission pipeline, and transmits the gas to the slot opened in the sealing disk through the sensing component. The sensing component is a pressure sensor with a receiving cavity inside. Conveying elements are installed on both sides of the receiving cavity to ensure the rapid circulation of the transmitted liquid or gas. The sensor installed inside can detect the passing gas and liquid. Then, data is transmitted through the installed resonant transmitter. The resonant transmitter is located near the receiving cavity and can generate an electromagnetic field to achieve information exchange with the control console. The sealing disk abuts against the inner side of the connecting pipe to detect the sealing of the plug valve body. When gas leaks from the plug valve body, the sensing component will make a sound to detect the sealing effect of the plug valve body. By injecting water into the input port, the sealing test of the waterproof effect of the plug valve body can be achieved, thereby improving the accuracy of the test, ensuring the quality of the plug valve body, and facilitating personnel to detect whether the plug valve body is qualified, thereby improving the efficiency of the test; (2) The telescopic rod is pushed to move by the hydraulic pump, so that the protective plate connected to the telescopic rod drives the mounting plate to move toward the connecting pipe, so that the sealing plate abuts against the inner side of the connecting pipe, thereby improving the sealing performance of the connecting pipe during inspection, preventing leakage of the equipment from affecting the inspection of the plug valve body, and the support rod connected to the frame plays a fixed limit role on the fixed seat, ensuring that the sealing plate and the connecting pipe are kept on the same horizontal plane, so that the sealing plate and the connecting pipe can achieve a sealing effect when connected; (3) The limit block installed on the positioning plate plays a fixed limiting role on the locking plate. The sealing plate can be disassembled and replaced by rotating the locking plate, which is convenient for the inspection and replacement of the sealing plate, and convenient for the detection of plug valve bodies of different sizes, thereby improving the flexibility of detection; (4) The sealing valve core is driven to rotate by turning the handle, thereby controlling the opening and closing of the sealing valve core, so that the two sets of sealing disks can ensure the sealing detection of the plug valve body and reduce the detection error. The manual rocker is turned, and the manual rocker drives the rotating rod to rotate. The rotating rod drives the first bevel gear and the second bevel gear to engage and connect. The second bevel gear drives the spiral rod to rotate, thereby pushing the movable rod to drive the limit plate to drive the clamping block to move, so that the clamping block clamps and fixes the plug valve body; (5) Two groups of clamping blocks are provided to facilitate fixing the two sides of the plug valve body, thereby preventing the plug valve body from shifting during testing and causing errors in testing, thereby achieving the purpose of improving the accuracy of testing; (6) During the pushing process, the pressing rod is pressed against the buffer spring, and the buffer spring relieves the impact force, reduces the friction on the surface of the plug valve body, improves the protection of the plug valve body, and reduces the wear of the plug valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the base of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the mounting plate of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the protective plate of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the limit block of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the plug valve body of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the protection box of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the limiting plate of the present invention; Fig. 9 It is a schematic diagram of the cross-sectional structure of the clamping block of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the locking disk of the present invention.

[0020] In the figure: 1. base; 2. frame; 3. control console; 4. input port; 5. output port; 6. air pump; 7. hydraulic pump; 8. telescopic rod; 9. protective plate; 10. mounting plate; 11. positioning plate; 12. limit block; 13. locking plate; 14. sealing plate; 15. connecting pipe; 16. plug valve body; 17. sealing valve core; 18. turning handle; 19. positioning rod; 20. support rod; 21. fixed seat; 22. protection box; 23. turning rod; 24. manual rocker; 25. first bevel gear; 26. second bevel gear; 27. spiral rod; 28. movable rod; 29. ​​buffer spring; 30. pressing rod; 31. limit plate; 32. limit rod; 33. clamping block; 34. transmission pipeline; 35. induction component. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0022] Example 1: Please refer to Figure 1 - Fig.10 The present invention provides the following technical solutions: a high-precision plug valve multi-stage sealing pressure test device, comprising a base 1, a frame 2 is fixedly installed on the top of the base 1, a control console 3 is fixedly installed on the top of the base 1, a fixed seat 21 is fixedly installed on the top of the base 1, a protection box 22 is fixedly installed on the top of the fixed seat 21, and an auxiliary detection pressure test mechanism is arranged between the control console 3 and the fixed seat 21; a protective plate 9 is movably abutted against the top of the base 1, a mounting disk 10 is fixedly installed on the outer surface of the protective plate 9, a positioning disk 11 is fixedly installed on the inner side of the mounting disk 10, and a sealing mechanism that is easy to replace is arranged between the protective plate 9 and the positioning disk 11; an input port 4 is fixedly installed on the top of the frame 2, an air pump 6 is fixedly installed on the top of the frame 2, a plug valve body 16 is movably installed on the inner side of the fixed seat 21, and an auxiliary positioning clamping mechanism is arranged between the plug valve body 16 and the fixed seat 21.

[0023] The sealing performance of the plug valve body 16 is tested by means of an auxiliary testing pressure test mechanism arranged between the control console 3 and the fixed seat 21, thereby ensuring that the sealing quality of the plug valve body 16 is qualified and reducing the risk of the equipment. The easily replaceable sealing mechanism arranged between the protective plate 9 and the positioning disk 11 facilitates the replacement of the equipment and facilitates the sealing performance testing of plug valves of different sizes. The plug valve body 16 is clamped by means of an auxiliary positioning clamping mechanism arranged between the plug valve body 16 and the fixed seat 21, thereby preventing the plug valve body 16 from being offset during the test and causing errors in the detection, thereby achieving the purpose of improving the accuracy of the detection.

[0024] Example 2: Based on Example 1, please refer to Figure 1 - Fig.10 , a sealing disk 14 is also disclosed, and its specific structure is as follows: an output port 5 is fixedly installed on the top of the frame 2, a transmission pipeline 34 is fixedly installed on the outer surface of the frame 2, the transmission pipeline 34 is fixedly installed on the outer surface of the induction component 35, and the induction component 35 is fixedly installed on the outer surface of the protective plate 9, the pressure test mechanism includes a hydraulic pump 7, the hydraulic pump 7 is fixedly installed on the inner end of the frame 2, a telescopic rod 8 is movably installed on the outer surface of the hydraulic pump 7, a protective plate 9 is fixedly installed on the outer surface of the telescopic rod 8, and the telescopic rod 8 and the protective plate 9 form a telescopic The protective plate 9 has a retractable structure, a positioning rod 19 is movably mounted on the inner side of the protective plate 9, the positioning rod 19 is fixedly mounted on the outer surface of the frame 2, a support rod 20 is fixedly mounted on the inner side of the frame 2, and a fixing seat 21 is fixedly mounted on the outer surface of the support rod 20, the sealing mechanism includes a limit block 12, the limit block 12 is fixedly mounted on the outer surface of the positioning disk 11, a clamping disk 13 is movably mounted on the outer surface of the limit block 12, and a sealing disk 14 is fixedly mounted on the outer surface of the clamping disk 13, and the clamping disk 13 is movably abutted against the outer surface of the positioning disk 11.

[0025] Gas is injected through the input port 4 so that the gas circulates through the inside of the transmission pipe 34, and the gas is transmitted to the slot opened in the sealing disk 14 through the sensing component 35. The sensing component 35 is a pressure sensor, and a receiving cavity is arranged inside. Conveying elements are installed on both sides of the receiving cavity to ensure the rapid circulation of the transmitted liquid or gas. The sensor installed inside can detect the passing gas and liquid, and then the data is transmitted through the installed resonant transmitter. The resonant transmitter is located near the receiving cavity and can generate an electromagnetic field to realize information interaction with the console 3. The sealing disk 14 abuts against the inner side of the connecting tube 15, and the sealing disk 14 is provided with two groups, which abut against both sides of the connecting tube 15 to realize the sealing of the plug valve body 16. When the plug valve body 16 leaks gas, the sensing component 35 will make a sound, thereby detecting the sealing effect of the plug valve body 16, which is convenient for personnel to detect whether the plug valve body 16 is qualified, thereby improving the efficiency of detection, and the hydraulic pump 7 is used to push The telescopic rod 8 moves, so that the protective plate 9 connected to the telescopic rod 8 drives the mounting plate 10 to move toward the connecting tube 15, so that the sealing plate 14 abuts against the inner side of the connecting tube 15, to improve the sealing performance of the connecting tube 15 during detection, to prevent leakage of the equipment from affecting the detection of the plug valve body 16, and the support rod 20 connected to the frame 2 plays a fixed limiting role on the fixing seat 21, to ensure that the sealing plate 14 and the connecting tube 15 are maintained at the same horizontal plane, so that the sealing plate 14 and the connecting tube 15 can play a sealing effect when connected, and the limiting block 12 installed by the positioning plate 11 plays a fixed limiting role on the engaging plate 13, and the sealing plate 14 can be disassembled and replaced by rotating the engaging plate 13, so that the sealing plate 14 can be conveniently inspected and replaced, and the plug valve body 16 of different sizes can be conveniently detected, and the flexibility of detection is improved. At the same time, water is injected into the input port 4, so as to realize the sealing detection of the waterproof effect of the plug valve body 16, improve the accuracy of detection, and ensure the quality of the plug valve body 16.

[0026] Example 3: Based on Example 1, please refer to Figure 1 - Fig. 9, a clamping block 33 is also disclosed, and its specific structure is as follows: a sealing disk 14 is movably abutted against the inner side of a connecting tube 15, and the connecting tube 15 is fixedly installed on the outer surface of a plug valve body 16, and a sealing valve core 17 is movably installed on the inner side of the plug valve body 16, and a rotating handle 18 is movably installed on the outer surface of the sealing valve core 17, and a rotating rod 23 is movably installed on the inner side of a protection box 22, and a manual rocker 24 is fixedly installed on the top of the rotating rod 23, and a first bevel gear 25 is fixedly installed on the outer surface of the rotating rod 23, and the first bevel gear 25 is meshedly connected with a second bevel gear 26, and a spiral rod 27 is fixedly installed on the inner side of the second bevel gear 26, and the spiral rod A movable rod 28 is threadedly installed on the outer surface of 27, a limit plate 31 is fixedly installed on the outer surface of the movable rod 28, and the spiral rod 27 and the movable rod 28 form a telescopic structure. The clamping mechanism includes a buffer spring 29, the buffer spring 29 is fixedly installed on the inner side of the movable rod 28, a pressing rod 30 is fixedly installed on the outer surface of the buffer spring 29, a clamping block 33 is fixedly installed on the outer surface of the pressing rod 30, and the buffer spring 29 and the pressing rod 30 form a telescopic structure. The clamping block 33 is movably abutted against the outer surface of the plug valve body 16, and a limit rod 32 is fixedly installed on the inner side of the clamping block 33, and the limit rod 32 is movably installed on the inner side of the limit plate 31.

[0027] The sealing valve core 17 is driven to rotate by rotating the handle 18, so as to control the opening and closing of the sealing valve core 17, so that the two groups of sealing disks 14 can ensure the sealing detection of the plug valve body 16 and reduce the detection error. The manual rocker 24 is rotated, and the manual rocker 24 drives the rotating rod 23 to rotate. The rotating rod 23 drives the first bevel gear 25 and the second bevel gear 26 to engage and connect. The second bevel gear 26 drives the spiral rod 27 to rotate, thereby pushing the movable rod 28 to drive the limit plate 31 to drive the clamping block 33 to move, so that the clamping block 33 clamps and fixes the plug valve body 16. The clamping block 33 is provided with two groups, which is convenient for fixing the two sides of the plug valve body 16, avoiding the displacement of the plug valve body 16 during the test and causing the detection error, so as to achieve the purpose of improving the accuracy of the detection. In the pushing process, the pressing rod 30 is forced to press the buffer spring 29, and the buffer spring 29 relieves the impact force generated, reduces the friction on the surface of the plug valve body 16, improves the protection of the plug valve body 16, and reduces the wear of the plug valve body 16.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision plug valve multi-stage sealing pressure testing device, comprising a base (1), the top of the base (1) being fixedly mounted with a frame (2), characterized in that: A control console (3) is fixedly mounted on the top of the base (1), a fixing seat (21) is fixedly mounted on the top of the base (1), a protection box (22) is fixedly mounted on the top of the fixing seat (21), and a pressure test mechanism for auxiliary detection is provided between the control console (3) and the fixing seat (21); The top end of the base (1) is movably abutted against a protective plate (9), a mounting plate (10) is fixedly mounted on the outer surface of the protective plate (9), a positioning plate (11) is fixedly mounted on the inner side of the mounting plate (10), and a sealing mechanism that is easy to replace is provided between the protective plate (9) and the positioning plate (11); An input port (4) is fixedly mounted on the top of the frame (2), an air pump (6) is fixedly mounted on the top of the frame (2), a plug valve body (16) is movably mounted on the inner side of the fixed seat (21), and an auxiliary positioning clamping mechanism is provided between the plug valve body (16) and the fixed seat (21).

2. A high-precision plug valve multi-stage sealing pressure testing device according to claim 1, characterized in that: An output port (5) is fixedly mounted on the top of the frame (2), a transmission pipe (34) is fixedly mounted on the outer surface of the frame (2), the transmission pipe (34) is fixedly mounted on the outer surface of the induction component (35), and the induction component (35) is fixedly mounted on the outer surface of the protective plate (9).

3. A high-precision plug valve multi-stage sealing pressure testing device according to claim 1, characterized in that: The pressure testing mechanism comprises a hydraulic pump (7), the hydraulic pump (7) being fixedly mounted on the inner end of the frame (2), a telescopic rod (8) being movably mounted on the outer surface of the hydraulic pump (7), a protective plate (9) being fixedly mounted on the outer surface of the telescopic rod (8), and the telescopic rod (8) and the protective plate (9) forming a telescopic structure.

4. A high-precision plug valve multi-stage sealing pressure testing device according to claim 3, characterized in that: A positioning rod (19) is movably mounted on the inner side surface of the protective plate (9), the positioning rod (19) is fixedly mounted on the outer surface of the frame (2), a support rod (20) is fixedly mounted on the inner side surface of the frame (2), and a fixing seat (21) is fixedly mounted on the outer surface of the support rod (20).

5. A high-precision plug valve multi-stage sealing pressure testing device according to claim 1, characterized in that: The sealing mechanism comprises a limit block (12), the limit block (12) being fixedly mounted on the outer surface of the positioning plate (11), a locking plate (13) being movably mounted on the outer surface of the limit block (12), a sealing plate (14) being fixedly mounted on the outer surface of the locking plate (13), and the locking plate (13) being movably abutted against the outer surface of the positioning plate (11).

6. A high-precision plug valve multi-stage sealing pressure testing device according to claim 5, characterized in that: The sealing disk (14) is movably abutted against the inner side surface of the connecting tube (15); the connecting tube (15) is fixedly mounted on the outer surface of the plug valve body (16); a sealing valve core (17) is movably mounted on the inner side surface of the plug valve body (16); and a rotating handle (18) is movably mounted on the outer surface of the sealing valve core (17).

7. A high-precision plug valve multi-stage sealing pressure testing device according to claim 1, characterized in that: A rotating rod (23) is movably mounted on the inner side surface of the protection box (22), a manual rocker (24) is fixedly mounted on the top end of the rotating rod (23), a first bevel gear (25) is fixedly mounted on the outer surface of the rotating rod (23), and the first bevel gear (25) is meshingly connected with a second bevel gear (26).

8. A high-precision plug valve multi-stage sealing pressure testing device according to claim 7, characterized in that: A screw rod (27) is fixedly mounted on the inner side surface of the second bevel gear (26), a movable rod (28) is threadedly mounted on the outer surface of the screw rod (27), a limit plate (31) is fixedly mounted on the outer surface of the movable rod (28), and the screw rod (27) and the movable rod (28) form a telescopic structure.

9. A high-precision plug valve multi-stage sealing pressure testing device according to claim 1, characterized in that: The clamping mechanism comprises a buffer spring (29), wherein the buffer spring (29) is fixedly mounted on the inner side of the movable rod (28), a pressing rod (30) is fixedly mounted on the outer surface of the buffer spring (29), a clamping block (33) is fixedly mounted on the outer surface of the pressing rod (30), and the buffer spring (29) and the pressing rod (30) form a telescopic structure.

10. A high-precision plug valve multi-stage sealing pressure testing device according to claim 9, characterized in that: The clamping block (33) is movably abutted against the outer surface of the plug valve body (16), a limiting rod (32) is fixedly mounted on the inner side surface of the clamping block (33), and the limiting rod (32) is movably mounted on the inner side surface of the limiting plate (31).

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