Valve sealing performance detection equipment

Abstract

The invention relates to the technical field of valve detection equipment, and discloses valve sealing performance detection equipment, a rotating mechanism is arranged at the upper end of a mounting base body, a valve fixing mechanism is arranged on one side of the rotating mechanism, and the rotating mechanism can drive the valve fixing mechanism to rotate; a locking mechanism used for locking rotation of the valve fixing mechanism is arranged on the side portion of the valve fixing mechanism, a driving mechanism used for driving the valve fixing mechanism to move longitudinally is arranged on the side portion of the valve fixing mechanism, and a sealing assembly used for sealing a valve flange is arranged in the valve fixing mechanism. A water injection assembly for injecting water into the valve is arranged on the outer side of the valve fixing mechanism, a sealing performance detection mechanism is arranged on one side of the valve fixing mechanism, the end face of the valve is effectively sealed through the valve fixing mechanism, the sealing assembly can effectively seal the end face of the valve, and the accuracy of a detection result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve detection equipment, and specifically provides a valve sealing detection equipment. Background Art

[0002] When valves are produced, it is necessary to detect their sealing performance to prevent fluid leakage at the valves. When performing sealing detection on valves, the valves need to be installed on the detection station first, and then a pressing plate is used to press the valves to form a sealed space. Gas or other fluids are introduced into the valve body to detect whether the internal pressure of the valve is stable.

[0003] After retrieval, a Chinese patent with the publication number CN219830232U discloses a valve sealing detection equipment. By setting support columns, U-shaped positioning frames in cooperation with first threaded holes, height adjustment bolts, second threaded holes, and horizontal tightening bolts, it is convenient to fix the valves, preventing the valves from moving when pressurizing the valves. At the same time, it is also convenient to adjust the position of the valves according to different valve models, and the detection and installation of the valves are relatively simple and efficient. By setting a driving motor, a first threaded section, a guide rod, a lead screw, a second threaded section, and a support frame, it is convenient to drive two test pipes to quickly dock with both ends of the valves. However, there are still the following problems:

[0004] 1. The valves are fixed by tightening bolts. The surface of the valves is a smooth sphere, and the tightening bolts are prone to slide on the surface of the valves. Therefore, the fixing effect of this method is not good enough, and the ends of the valves are prone to shake, which will have a very large impact on the detection results. If the valves fall, it will cause unnecessary losses and pose a threat to the safety of the test personnel.

[0005] 2. The diameter of the sealing ring cannot be changed, so it can only fix valves of one specification, and the applicable range is too small.

[0006] 3. The effect of only using a sealing ring to seal the end face of the valve is poor. When valves are installed, they are generally connected by flanges. After the flanges are installed with bolts, a large pressure can be generated between the two flanges to seal the valves and pipelines. However, when testing, the method of using a motor to drive the sealing ring to press the end face of the valve generates too little pressure, and it is impossible to determine whether the leakage point is at the connection between the sealing ring and the valve.

[0007] 4. It can only judge whether the valve leaks air, and it is not easy to judge which side of the valve leaks air, which is not conducive to subsequent maintenance and improvement of valve products. Summary of the Invention

[0008] Technical Problems to be Solved

[0009] Aiming at the deficiencies of the prior art, the present invention provides a valve sealing detection equipment, mainly to solve the problems of too poor sealing effect and fixing effect.

[0010] Technical Solution

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A valve sealing detection device comprises a mounting base body, a rotating mechanism is arranged at the upper end of the mounting base body, a valve fixing mechanism is arranged on one side of the rotating mechanism, the rotating mechanism can drive the valve fixing mechanism to rotate, a locking mechanism for locking the rotation of the valve fixing mechanism is arranged on the side of the valve fixing mechanism, a driving mechanism for driving the valve fixing mechanism to move longitudinally is arranged on the side of the valve fixing mechanism, a sealing component for sealing the valve flange is arranged inside the valve fixing mechanism, a water injection component for injecting water into the valve is arranged on the outside of the valve fixing mechanism, and a sealing detection mechanism is arranged on one side of the valve fixing mechanism.

[0013] As a further solution of the present invention, a structural reinforcement plate is welded and fixed to the upper end of the mounting base body, and a support column is also welded and fixed to the upper end of the mounting base body, and the side of the structural reinforcement plate is welded and fixed to the support column. The rotating mechanism includes a turntable, which is rotatably installed on the side of the support column, and a bearing 1 is embedded in the center of the support column. The driving mechanism includes a side plate, and a support rod is integrally formed at the outer center of the side plate. The support rod is fixedly inserted into the inner ring of the bearing 1, and one end of the support rod passes through the bearing 1 and is welded and fixed to the turntable.

[0014] As a further solution of the present invention, two groups of symmetrically arranged hemispherical clamping holes are opened on one side of the side panel, the locking mechanism includes a clamping rod and a spring, guide holes are opened on the support column corresponding to the clamping holes, the clamping rod is inserted into the guide holes, a limit block is provided on the side of the clamping rod away from the side panel, both ends of the spring are respectively welded and fixed to the limit block and the side wall of the support column, and one end of the clamping rod is integrally formed with a hemispherical clamping portion.

[0015] As a further solution of the present invention, a drive motor is detachably mounted on the upper end of the side plate by bolts, and two sets of bearings are mounted on the side plate, a double-threaded rod with reverse threads is rotatably connected between the bearings, the output shaft of the drive motor is transmission-connected to the double-threaded rod via a flat key, and the outer side of the double-threaded rod is threadedly connected to a drive plate.

[0016] As a further solution of the present invention, the side panel is provided with two groups of symmetrically arranged limit slide grooves, one side of the drive plate is integrally formed with a limit slide seat, and the drive plate is slidably connected to one side of the side panel through the cooperation of the limit slide groove and the limit slide seat.

[0017] As a further solution of the present invention, the valve fixing mechanism includes a circular fixing seat, which is welded and fixed to one side of the side plate, and eight groups of limiting chutes II are provided on the circular fixing seat. The eight groups of limiting chutes II are arranged in an annular array, and the circular fixing seat is slidably connected with a cylindrical flange clamping seat with a hemispherical end through the limiting chutes II.

[0018] As a further solution of the present invention, the sealing assembly includes an inner sealing ring and an outer sealing ring integrally formed on the side of the fixing seat. The inner sealing ring, the outer sealing ring and the fixing seat are all hollow structures, and a Schrader valve is connected to the outside of the outer sealing ring. Elastic inner and outer sealing airbags are respectively installed on the outside of the inner sealing ring and the inside of the outer sealing ring, and the Schrader valve, the inner sealing airbag and the outer sealing airbag are communicated with each other.

[0019] As a further solution of the present invention, the water injection assembly includes a water injection hole opened on the outside of the fixing seat, an installation groove is opened on the inside of the fixing seat, and a sealing cover plate is rotatably connected in the installation groove through a bearing. One side of the sealing cover plate is fixedly connected with a torsion spring, and the other end of the torsion spring is fixedly connected with the installation groove.

[0020] As a further solution of the present invention, the sealing performance detection mechanism includes a pressure gauge, which is installed on the fixing seat. A pressure conduction port is opened on the inside of the fixing seat, and the pressure sensing surface of the pressure gauge is arranged in the pressure conduction port, and the reading surface of the pressure gauge is exposed outside the fixing seat.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention provides a valve sealing performance detection device, which has the following beneficial effects:

[0023] 1. The present invention fixes the end face of the valve through the fixing seat in the valve fixing mechanism, and a slidable flange clamping seat is arranged in the fixing seat. The flange clamping seat can be inserted into the hole of the flange on the valve end face and cooperate with the fixing seat for fixing, so that the firmness after fixing is improved, and the problem of poor fixing effect in the prior art is solved.

[0024] 2. The present invention fixes the end face of the valve through the fixing seat. The distance between the outer diameter of the inner sealing ring and the inner diameter of the outer sealing ring on the fixing seat is relatively large, so that the fixing seat can fix valves of different models within a certain range, and the problem of too large limitation of the use range in the prior art is solved.

[0025] 3. The present invention drives two valve fixing mechanisms to fix through a driving motor. Except for manually positioning the end face of the valve, no excessive operation is required by the tester.

[0026] 4. After the end face of the valve is fixed by the valve fixing mechanism of the present invention, air is injected into the inner sealing airbag and the outer sealing airbag through the nozzle. After the air injection, the inner and outer sides of the end face of the valve are sealed through the cooperation of the inner sealing airbag and the outer sealing airbag, improving the sealing effect.

[0027] 5. The valve fixing mechanism of the present invention can be rotated through the rotating mechanism on the side. After the valve is fixed, the valve fixing mechanism is first rotated to the horizontal state for a water injection test to check whether the reading of the through pressure gauge changes too quickly after the water injection stops. If it changes too quickly, it proves that there is a problem with the sealing performance. Then, the fixing mechanism is rotated 90 degrees and locked by the locking mechanism. By using the internal air pressure of the valve and the gravity of the water, it is observed whether water seeps out from the lower end face. If there is water seepage, it proves that the lower end face of the valve leaks at this time. If there is no water seepage and the reading of the pressure gauge still drops, the upper end face leaks, solving the problem in the prior art that it is difficult to determine the leakage position. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 10 is a front-side three-dimensional structural schematic diagram of a valve sealing performance detection device proposed by the present invention in a horizontal state;

[0029] Figure 2 FIG. 14 is a front-side three-dimensional structural schematic diagram of a valve sealing performance detection device proposed by the present invention in a vertical state;

[0030] Figure 3 FIG. 18 is a rear-side three-dimensional structural schematic diagram of a valve sealing performance detection device proposed by the present invention in a horizontal state;

[0031] Figure 4 FIG. 22 is an upper-side three-dimensional structural schematic diagram of the valve fixing mechanism of a valve sealing performance detection device proposed by the present invention;

[0032] Figure 5 FIG. 26 is a rear-side three-dimensional structural schematic diagram of the valve fixing mechanism of a valve sealing performance detection device proposed by the present invention;

[0033] Figure 6 FIG. 30 is a Figure 1 magnified structural schematic diagram of part A of a valve sealing performance detection device proposed by the present invention.

[0034] Figure 7 FIG. 36 is a Figure 4 magnified structural schematic diagram of part B of a valve sealing performance detection device proposed by the present invention.

[0035] In the figure: 1. Installation base body; 2. Rotating mechanism; 3. Valve fixing mechanism; 4. Locking mechanism; 5. Driving mechanism; 6. Sealing assembly; 7. Water injection assembly; 8. Sealing performance detection mechanism; 101. Structural reinforcement plate; 102. Support column; 103. First bearing; 104. Guide hole; 201. Turntable; 301. Fixed seat; 302. Second limiting sliding groove; 303. Flange clamping seat; 401. Clamping rod; 402. Spring; 403. Limiting block; 404. Clamping portion; 501. Side plate; 502. Support rod; 503. Clamping hole; 504. Second bearing; 505. Double threaded rod; 506. Driving plate; 507. First limiting sliding groove; 508. Limiting sliding seat; 509. Driving motor; 601. Inner sealing ring; 602. Outer sealing ring; 603. Schrader valve; 604. Inner sealing airbag; 605. Outer sealing airbag; 701. Water injection hole; 702. Installation groove; 703. Sealing cover plate; 704. Torsion spring; 801. Air pressure detection gauge; 802. Pressure conduction port. Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] The serial numbers assigned to the components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise clearly defined and limited, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and is 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 a limitation to the present invention.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] Reference Figures 1-7 , a valve sealing performance detection device, including an installation base body 1, a rotation mechanism 2 is arranged at the upper end of the installation base body 1, a valve fixing mechanism 3 is arranged on one side of the rotation mechanism 2, the rotation mechanism 2 can drive the valve fixing mechanism 3 to rotate, a locking mechanism 4 for locking its rotation is arranged on the side of the valve fixing mechanism 3, a driving mechanism 5 for driving its longitudinal movement is arranged on the side of the valve fixing mechanism 3, a sealing component 6 for sealing the valve flange is arranged inside the valve fixing mechanism 3, a water injection component 7 for injecting water into the valve is arranged outside the valve fixing mechanism 3, and a sealing performance detection mechanism 8 is arranged on one side of the valve fixing mechanism 3.

[0040] Especially in the present invention, a structural strengthening plate 101 is welded and fixed to the upper end of the installation base body 1, and a support column 102 is also welded and fixed to the upper end of the installation base body 1. The side of the structural strengthening plate 101 is welded and fixed to the support column 102. Six groups of the structural strengthening plate 101 are arranged outside the support column 102 to support the support column 102. The rotation mechanism 2 includes a turntable 201, and the turntable 201 is rotatably installed on the side of the support column 102.

[0041] It should be noted that a bearing one 103 is embedded in the center of the support column 102. The driving mechanism 5 includes a side plate 501. A support rod 502 is integrally formed at the center of the outside of the side plate 501. The support rod 502 is fixedly inserted into the inner ring of the bearing one 103, and one end of the support rod 502 penetrates through the bearing one 103 and is welded and fixed to the turntable 201. By manually rotating the turntable 201, the valve fixing mechanism 3 is rotated to facilitate subsequent detection of the water leakage position.

[0042] Especially in the present invention, two groups of symmetrically arranged hemispherical card holes 503 are opened on one side of the side plate 501. The locking mechanism 4 includes a clamping rod 401 and a spring 402. A guide hole 104 is opened on the support column 102 corresponding to the card hole 503. The clamping rod 401 is inserted through the guide hole 104. A limiting block 403 is integrally formed on the outside of the guide hole 104. The two ends of the spring 402 are respectively welded and fixed to the limiting block 403 and the side wall of the support column 102, and a hemispherical clamping portion 404 is integrally formed at one end of the clamping rod 401. When the valve fixing mechanism 3 rotates to the vertical state to judge the water leakage position, the clamping rod 401 is inserted into the card hole 503 under the action of the spring 402 to lock the valve fixing mechanism 3, and it is not necessary for the staff to manually maintain the balance of the valve fixing mechanism 3 through the turntable 201, liberating manpower.

[0043] It should be noted that a driving motor 509 is detachably installed at the upper end of the side plate 501 through bolts, and two groups of second bearings 504 are installed on the side plate 501. A double threaded rod 505 with reverse threads is rotatably connected between the second bearings 504. The output shaft of the driving motor 509 is in transmission connection with the double threaded rod 505 through a flat key. A driving plate 506 is threadedly connected to the outer side of the double threaded rod 505. By rotating the driving motor 509, the driving plate 506 can be driven to approach or move away, so as to drive the valve fixing mechanism 3 to fix the end face of the valve.

[0044] Especially in the present invention, two groups of symmetrically arranged first limiting chutes 507 are formed on the side plate 501. A limiting sliding seat 508 is integrally formed on one side of the driving plate 506. The driving plate 506 is slidably connected to one side of the side plate 501 through the cooperation of the first limiting chute 507 and the limiting sliding seat 508. The cooperation of the first limiting chute 507 and the limiting sliding seat 508 can prevent the driving plate 506 from falling off and make the up and down movement of the driving plate 506 smoother.

[0045] It should be noted that the valve fixing mechanism 3 includes a circular fixing seat 301, which is welded and fixed to one side of the side plate 501. Eight groups of second limiting chutes 302 are formed on the circular fixing seat 301. The eight groups of second limiting chutes 302 are arranged in an annular array. A cylindrical flange clamping seat 303 with a hemispherical end is slidably connected to the circular fixing seat 301 through the second limiting chutes 302. A limiting structure is also provided at the lower end of the flange clamping seat 303, and there is a certain resistance at the bottom of the flange clamping seat 303, so it will not slide randomly. It will only slide when the thrust reaches about 5N, and the self weight of the flange clamping seat 303 is about 1N.

[0046] Especially in the present invention, the sealing assembly 6 includes an inner sealing ring 601 and an outer sealing ring 602 integrally formed on the side of the fixing seat 301. The inner sealing ring 601, the outer sealing ring 602 and the fixing seat 301 are all hollow structures. A Presta valve 603 is connected to the outer side of the outer sealing ring 602. Elastic inner sealing air bags 604 and outer sealing air bags 605 are respectively installed on the outer side of the inner sealing ring 601 and the inner side of the outer sealing ring 602. The Presta valve 603, the inner sealing air bags 604 and the outer sealing air bags 605 are interconnected. The inner sealing air bags 604 and the outer sealing air bags 605 are inflated through the Presta valve 603. After inflation, the inner and outer sides of the valve end face are sealed through the cooperation of the inner sealing air bags 604 and the outer sealing air bags 605.

[0047] It should be noted that the water injection assembly 7 includes a water injection hole 701 opened on the outer side of the fixed seat 301. An installation groove 702 is opened on the inner side of the fixed seat 301. A sealing cover plate 703 is rotatably connected in the installation groove 702 through a bearing. One side of the sealing cover plate 703 is fixedly connected with a torsion spring 704, and the other end of the torsion spring 704 is fixedly connected with the installation groove 702. A section extends out of the outer side of the water injection hole 701 for facilitating the connection of a water pipe for water injection. The sealing cover plate 703 can only rotate unidirectionally under the support of the installation groove 702, and under the action of the torsion spring 704 and the internal air pressure of the valve, the sealing cover plate 703 can only rotate and open during water injection, and will close automatically when the water injection stops.

[0048] Particularly in the present invention, the sealing performance detection mechanism 8 includes a barometric pressure detection meter 801, which is installed on the fixed seat 301. A pressure conduction port 802 is opened on the inner side of the fixed seat 301. The pressure sensing surface of the barometric pressure detection meter 801 is arranged in the pressure conduction port 802, and the reading surface of the barometric pressure detection meter 801 is exposed outside the fixed seat 301. The pressure conduction port 802 is communicated with the inside of the valve. By observing the speed of the reading of the barometric pressure detection meter 801 decreasing, it can be known whether there is water leakage.

[0049] It should be noted that since it is still impossible to achieve complete sealing during testing and when the valve is specifically installed, it is normal for the reading of the barometric pressure detection meter 801 to decrease slowly. This testing equipment can only achieve relatively accurate qualitative analysis.

[0050] The present invention is used in the following steps:

[0051] S1: Rotate the valve fixing mechanism 3 through the turntable 201 to make the valve fixing mechanism 3 rotate to the vertical state, and lock it by inserting the clamping rod 401 in the locking mechanism 4 into the clamping hole 503 on the side plate 501;

[0052] S2: Drive the two driving plates 506 to move away through the driving motor 509 in the driving mechanism 5, thereby driving the valve fixing mechanisms 3 to move away from each other, increasing the distance between the two valve fixing mechanisms 3, and reserving a position for installing the valve;

[0053] S3: Manually measure the maximum distance between the holes on the end face flange of the valve, and adjust the positions of the flange clamping seats 303 in the two valve fixing mechanisms 3 to correspond to the valve flange. This step can also be carried out before S1;

[0054] S4: First, snap the lower end face of the valve into the lower valve fixing mechanism 3, and then hold the valve to keep it in the vertical state. Start the driving motor 509 to drive the two valve fixing mechanisms 3 to move closer to each other until the upper valve fixing mechanism 3 fixes the upper end face of the valve;

[0055] S5: Inflate the nozzle air nozzles 603 on the sides of the upper and lower sealing assemblies 6 in sequence, so that the inner sealing airbag 604 and the outer sealing airbag 605 expand, and finally seal the inner and outer sides of the valve end face;

[0056] S6: Connect water pipes to the outsides of the two water injection holes 701, and inject water into the valve through any one of the water injection holes 701. It is also possible to only connect a water pipe to the outside of one water injection hole 701, and seal the other water injection hole 701 with the equipped threaded end cap;

[0057] S7: Rotate the valve fixing mechanism 3 to the horizontal state, observe the changes in the readings of the two air pressure gauges 801. Rotating to the horizontal state allows observing both air pressure gauges 801 simultaneously. If one shows an abnormal phenomenon while the other does not, and combined with whether there is actual water seepage, it can be determined whether the above situation is caused by the damage of the single air pressure gauge 801;

[0058] S8: If the readings of the two air pressure gauges 801 drop too fast simultaneously, it proves that there is a problem with the sealing performance. Then rotate the valve fixing mechanism 3 by 90 degrees and lock it with the locking mechanism 4, and observe whether water seeps out from the lower end face by using the air pressure inside the valve and the gravity of water. If there is water seepage, it proves that the lower end face of the valve leaks at this time. If there is no water seepage and the readings of the air pressure gauges 801 still drop, the upper end face leaks.

[0059] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0060] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A valve sealing performance detection device, comprising an installation base body (1), characterized in that, A rotating mechanism (2) is provided at the upper end of the mounting base body (1). A valve fixing mechanism (3) is provided on one side of the rotating mechanism (2). The rotating mechanism (2) can drive the valve fixing mechanism (3) to rotate. A locking mechanism (4) for locking its rotation is provided on the side of the valve fixing mechanism (3). A driving mechanism (5) for driving its longitudinal movement is provided on the side of the valve fixing mechanism (3). A sealing component (6) for sealing the valve flange is provided inside the valve fixing mechanism (3). A water injection component (7) for injecting water into the valve is provided outside the valve fixing mechanism (3). A sealing performance detection mechanism (8) is provided on one side of the valve fixing mechanism (3).

2. The valve sealing performance detection device according to claim 1, characterized in that A structural strengthening plate (101) is welded and fixed to the upper end of the mounting base body (1), and a support column (102) is also welded and fixed to the upper end of the mounting base body (1). The side of the structural strengthening plate (101) is welded and fixed to the support column (102). The rotating mechanism (2) includes a turntable (201). The turntable (201) is rotatably installed on the side of the support column (102). A first bearing (103) is embedded in the center of the support column (102). The driving mechanism (5) includes a side plate (501). A support rod (502) is integrally formed at the center of the outer side of the side plate (501). The support rod (502) is fixedly inserted into the inner ring of the first bearing (103), and one end of the support rod (502) penetrates through the first bearing (103) and is welded and fixed to the turntable (201).

3. The valve sealing performance detection device according to claim 2, wherein, Two groups of symmetrically arranged hemispherical card holes (503) are formed on one side of the side plate (501). The locking mechanism (4) includes a latch (401) and a spring (402). A guide hole (104) corresponding to the card hole (503) is formed on the support column (102). The latch (401) is inserted through the guide hole (104). A limit block (403) is provided on the side of the latch (401) away from the side plate (501). The two ends of the spring (402) are respectively welded and fixed to the limit block (403) and the side wall of the support column (102). A hemispherical clamping portion (404) is integrally formed at one end of the latch (401).

4. A valve sealing performance detection device according to claim 2, characterized in that, A driving motor (509) is detachably installed on the upper end of the side plate (501) through bolts. Two second bearings (504) are installed on the side plate (501). A double threaded rod (505) with reverse threads is rotatably connected between the second bearings (504). The output shaft of the driving motor (509) is in transmission connection with the double threaded rod (505) through a flat key. A driving plate (506) is threadedly connected to the outer side of the double threaded rod (505).

5. The valve sealing performance detection device according to claim 4, characterized in that, Two groups of symmetrically arranged first limiting sliding grooves (507) are formed on the side plate (501). A limiting sliding seat (508) is integrally formed on one side of the driving plate (506). The driving plate (506) is slidably connected to one side of the side plate (501) through the cooperation of the first limiting sliding groove (507) and the limiting sliding seat (508).

6. The valve sealing performance detection device according to claim 2, characterized in that, The valve fixing mechanism (3) includes a circular fixing base (301), the circular fixing base (301) is welded and fixed to one side of the side plate (501), and eight groups of limiting sliding grooves two (302) are provided on the circular fixing base (301). The eight groups of limiting sliding grooves two (302) are arranged in an annular array, and the circular fixing base (301) is slidably connected with a cylindrical flange clamping seat (303) with a hemispherical end through the limiting sliding grooves two (302).

7. A valve sealing performance detection device according to claim 6, characterized in that, The sealing component (6) includes an inner sealing ring (601) and an outer sealing ring (602) integrally formed on the side of the fixing base (301). The inner sealing ring (601), the outer sealing ring (602) and the fixing base (301) are all hollow structures, and a Schrader valve (603) is connected to the outside of the outer sealing ring (602). Elastic inner sealing air bags (604) and outer sealing air bags (605) are respectively installed on the outside of the inner sealing ring (601) and the inside of the outer sealing ring (602). The Schrader valve (603), the inner sealing air bag (604) and the outer sealing air bag (605) are communicated with each other.

8. A valve sealing performance detection device according to claim 6, characterized in that, The water injection component (7) includes a water injection hole (701) opened on the outside of the fixing base (301). An installation groove (702) is opened on the inside of the fixing base (301). A sealing cover plate (703) is rotatably connected in the installation groove (702) through a bearing. One side of the sealing cover plate (703) is fixedly connected with a torsion spring (704), and the other end of the torsion spring (704) is fixedly connected with the installation groove (702).

9. The valve sealing performance detection device according to claim 6, characterized in that, The sealing performance detection mechanism (8) includes a pressure gauge (801). The pressure gauge (801) is installed on the fixing base (301). A pressure conduction port (802) is opened on the inside of the fixing base (301). The pressure sensing surface of the pressure gauge (801) is arranged in the pressure conduction port (802), and the reading surface of the pressure gauge (801) is exposed outside the fixing base (301).

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