Valve pressure testing device

Abstract

The utility model belongs to the technical field of valve detection, and particularly discloses a valve pressure testing device which comprises a base, a fixing plate and a limiting piece are arranged on the base, and a driving shaft is arranged between the fixing plate and the limiting piece. The movable plate is arranged on the driving shaft, a driving mechanism is arranged on the movable plate, and the driving mechanism can drive the movable plate to be close to or away from the fixed plate in the axial direction of the driving shaft; the blocking mechanism is arranged on the opposite side walls of the fixed plate and the movable plate, the blocking mechanism comprises an adjusting assembly and a blind plate, and the adjusting assembly is used for adjusting the position of the blind plate to correspond to the valve; and the placing mechanism is arranged between the movable plate and the fixed plate and is used for adjusting the direction and the position of the valve. According to the utility model, through the arrangement of the driving mechanism and the adjusting assembly, the centering of the blind plate and the valve can be conveniently realized, and meanwhile, a low-in high-out water inlet mode is adopted for detection, so that the pressurization time during detection is greatly shortened, and the detection efficiency of the valve is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve detection, in particular to a valve pressure testing device. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. During the production process of valves, it is necessary to conduct leakage and shell strength tests on the valves, and during the testing process, it is necessary to ensure the effective sealing of the inlet and outlet ends of the valves. The inlet and outlet ends of commonly used valves are flange-type. Common flange types include RF, FM, RJ, BW, etc. Among them, RF, FM, RJ, etc. can all be sealed by end face sealing. The sealing baffle does not need to be centered during sealing. For example, the sealing baffle can be fixed to the flange surface of the valve by bolts, or the sealing baffle can be fixed by claws, etc., which can conveniently complete the installation of the sealing baffle. However, for large-sized valves, the installation of the sealing baffle will also be more difficult.

[0003] In the prior art, for large-sized inner hole sealing valves, such as BW valves, since the connection between the valve flange and the pipeline is a butt welding connection, a welding groove is usually opened on the flange surface of the valve, and a circumferential seal is required to complete the sealing of the inlet and outlet ends of the valve. Therefore, for BW structure valves, especially medium / high pressure products with BW flanges, a blind plate plus a pull rod pulling structure is used to perform shell and leakage tests. Since the blind plates on both sides have no guide structure, it is easy for the blind plates on both sides to be non-parallel and the sealing ring to be cut by the flow channel. Therefore, it takes a lot of time to position the fit between the blind plate and the valve, resulting in low detection efficiency. In view of this, the applicant proposed a valve pressure test device. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a valve pressure testing device to solve the problem of low efficiency of valve pressure testing in the prior art.

[0005] In order to achieve the above-mentioned and other related purposes, the utility model provides a valve pressure testing device, comprising:

[0006] A base, wherein a fixing plate and a limiting member are provided on the base, and a driving shaft is provided between the fixing plate and the limiting member;

[0007] A movable plate, the movable plate is arranged on the driving shaft, a driving mechanism is arranged on the movable plate, and the driving mechanism can drive the movable plate to approach or move away from the fixed plate along the axial direction of the driving shaft;

[0008] A blocking mechanism is arranged on the side walls opposite to the fixed plate and the movable plate, the blocking mechanism comprises an adjusting component and a blind plate, the adjusting component is used to adjust the position of the blind plate to correspond to the valve;

[0009] A placing mechanism is arranged between the movable plate and the fixed plate, and the placing mechanism comprises a positioning plate for positioning the valve.

[0010] Optionally, the driving mechanism includes a driving gear, a driven gear and a driver, the driving gear is rotatably connected to the moving plate, the driven gear is rotatably connected to the moving plate and is coaxially connected to the driving shaft, the driven gears are all meshed with the driving gear, the driver is arranged on the moving plate, the output end of the driver is coaxially connected to the driving gear, and the driving gear is meshed with the driving gear.

[0011] Optionally, one end of the drive shaft is rotatably connected to the limit member, and the other end is rotatably connected to the fixed plate, and the drive shaft is threadedly connected to the movable plate, wherein the drive shaft rotates to drive the movable plate to move closer to or away from the fixed plate.

[0012] Optionally, the drive shaft includes two left and right groups, each group includes an upper drive shaft and a lower drive shaft, and the two groups of drive shafts are symmetrically arranged around the axis of the driving gear.

[0013] Optionally, the blind plate includes an external connection part and a matching part, the external connection part and the matching part are integrally formed, and a sealing ring is provided on the matching part, wherein when the blind plate blocks the valve, the external connection part is located outside the valve, and the matching part is embedded in the valve and matches with the valve.

[0014] Optionally, a liquid inlet channel and a liquid outlet channel are provided on the blind plate, the input end of the liquid inlet channel is arranged on the external connection part, the output end of the liquid inlet channel is arranged on the matching part, the input end of the liquid outlet channel is arranged on the matching part, and the output end of the liquid outlet channel is arranged on the external connection part.

[0015] Optionally, the input end of the liquid inlet channel is arranged at the lowest point of the external connection part, and the output end of the liquid outlet channel is arranged at the highest point of the external connection part.

[0016] Optionally, the adjustment assembly includes a first guide rail, a base plate and a second guide rail, the first guide rail is arranged on the side wall where the movable plate and the fixed plate are close to each other, the base plate is slidably connected to the first guide rail, and the second guide rail is arranged on the base plate, wherein the extension direction of the first guide rail and the extension direction of the second guide rail are perpendicular to each other, the base plate is provided with a mounting plate slidably connected to the second guide rail, and the blind plate is detachably connected to the mounting plate.

[0017] Optionally, the adjustment component also includes a lifting adjuster and a horizontal adjuster, the output end of the lifting adjuster is connected to the base plate to drive the base plate to move along the first guide rail, and the output end of the horizontal adjuster is connected to the mounting plate to drive the mounting plate to move along the second guide rail.

[0018] Optionally, the placement mechanism includes a placement seat and an adjustment seat, the adjustment seat can move along the length direction of the placement seat, and the positioning plate is rotatably connected to the adjustment seat.

[0019] As described above, the valve pressure testing device proposed by the utility model has the following beneficial effects:

[0020] (1) In the utility model, the movable plate is provided to drive the blocking mechanism to move closer to or away from the fixed plate, so that the blind plate in the blocking mechanism cooperates with the valve to block the valve. Compared with the prior art, the blocking method in the present application is more convenient, and the position of the valve can be adjusted to a suitable position by cooperating with the placement mechanism, so as to cooperate with the blocking mechanism more conveniently, thereby improving the blocking efficiency during valve testing.

[0021] (2) Compared with the prior art, the present invention can adjust the position of the blind plate in the horizontal and vertical directions by means of the adjustment component so as to align the matching parts of the blind plate and the valve. Therefore, when the blind plate and the valve are matched, the sealing ring on the blind plate is not easily cut by the flow channel opening, thereby improving the service life of the blind plate and ensuring the accuracy of the pressure test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic structural diagram of an embodiment of the utility model;

[0023] Figure 2 Shown is a front view of an embodiment of the utility model;

[0024] Figure 3 Shown is a left side view of an embodiment of the utility model;

[0025] Figure 4 Shown is a schematic diagram of the structure of a moving plate in one embodiment of the utility model;

[0026] Figure 5 Shown is a schematic structural diagram of a placement seat in one embodiment of the utility model;

[0027] Figure 6 Shown is a cross-sectional view of a blind plate in one embodiment of the present invention.

[0028] Description of reference numerals:

[0029] Base 1, fixed plate 2, first lightening hole 201, limiter 3, lower drive shaft 4, first positioning nut 401, upper drive shaft 5, second positioning nut 501, movable plate 6, second lightening hole 601, driver 7, drive gear 8, active gear 9, driven gear 10, lifting regulator 11, level regulator 12, first guide rail 13, bottom plate 14, second guide rail 15, mounting plate 16, blind plate 17, mounting hole 1701, liquid inlet channel 1702, liquid outlet channel 1703, sealing ring 1704, roller 18, placement seat 19, drive seat 20, screw rod 21, adjustment seat 22, positioning plate 23. DETAILED DESCRIPTION

[0030] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0031] It should be noted that the diagrams provided in the present embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, so the diagrams only show the components related to the present invention rather than the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be changed at will, and the layout of the components may be more complicated. The structure, proportion, size, etc. shown in the diagrams attached to this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect and purpose that the present invention can produce. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0032] like Figure 1-Figure 6 As shown, the utility model provides a valve pressure testing device.

[0033] In an exemplary embodiment, a valve pressure testing device comprises:

[0034] A base 1, on which a fixing plate 2 and a limiting member 3 are provided, and a driving shaft is provided between the fixing plate 2 and the limiting member 3;

[0035] A movable plate 6, wherein the movable plate 6 is arranged on the driving shaft, and a driving mechanism is arranged on the movable plate 6, and the driving mechanism can drive the movable plate 6 to approach or move away from the fixed plate 2 along the axial direction of the driving shaft;

[0036] The blocking mechanism is arranged on the side walls opposite to the fixed plate 2 and the movable plate 6. The blocking mechanism includes an adjustment component and a blind plate 17. The adjustment component is used to adjust the position of the blind plate 17 to correspond to the valve;

[0037] The placing mechanism is arranged between the movable plate 6 and the fixed plate 2. The placing mechanism includes a positioning plate 23 for adjusting the direction and position of the valve.

[0038] In this embodiment, the movable plate 6 is arranged to drive the blocking mechanism to move closer to or away from the fixed plate 2, so that the blind plate 17 in the blocking mechanism cooperates with the valve to block the valve. Compared with the prior art, the blocking method in the present application is more convenient, and the position of the valve can be adjusted to a suitable position by cooperating with the placement mechanism, so as to cooperate with the blocking mechanism more conveniently, thereby improving the blocking efficiency during valve testing.

[0039] At the same time, the adjustment component provided in this embodiment can adjust the position of the blind plate 17 in the horizontal and vertical directions so as to align the part where the blind plate 17 cooperates with the valve. Therefore, when the blind plate 17 cooperates with the valve, a higher degree of centering can ensure that the sealing ring 1704 on the blind plate 17 is not easily cut by the flow channel opening, thereby improving the service life of the blind plate 17 and ensuring the accuracy of the pressure test results.

[0040] It is worth noting that, in this embodiment, the base 1 and the placement mechanism can be placed on the ground. During installation, it is necessary to ensure that the installation surface is horizontal and the base 1 is in full contact with the ground.

[0041] It should also be noted that a control cabinet is also provided in this embodiment, and a control center is provided in the control cabinet, which is used to control the various electrical components in this application, and the control cabinet and the device are separately provided in this application, and are specifically installed on one side of the device, and then the electrical components are connected to the control cabinet to achieve electrical control. The separate setting of the control cabinet and the device body can avoid electric shock to the operator when manually operating the control panel in the event of leakage, thereby ensuring the personal safety of the operator and improving the safety performance of the device when in use.

[0042] It should also be noted that in this embodiment, a plurality of first weight-reducing holes 201 are opened on the fixed plate 2, and a plurality of second weight-reducing holes 601 are opened on the movable plate 6, which can effectively reduce the weight of the fixed plate 2 and the movable plate 6, save costs, and reduce assembly difficulty.

[0043] In an exemplary embodiment, the driving mechanism includes a driving gear 9, a driven gear 10 and a driver 7. The driving gear 9 is rotatably connected to the moving plate 6. The driven gear 10 is rotatably connected to the moving plate 6 and is coaxially connected to the driving shaft. The driven gears 10 are all meshed with the driving gear 9. The driver 7 is arranged on the moving plate 6. The output end of the driver 7 is coaxially connected to the driving gear 8, and the driving gear 8 is meshed with the driving gear 9.

[0044] In this embodiment, the driver 7 drives the driving gear 8 to rotate, and the driving gear 8 is engaged with the driving gear 9, thereby driving the driving gear 9 to rotate, and the driving gear 9 is engaged with the driven gear 10, thereby driving the driven gear 10 to rotate. Since the driven gear 10 is coaxially connected to the driving shaft, the rotation of the driven gear 10 can drive the driving shaft to rotate, and the driving shaft cooperates with the movable plate 6, and finally the driving shaft drives the movable plate 6 to move.

[0045] Exemplarily, in this embodiment, one end of the driving shaft is rotatably connected to the stopper 3, and the other end is rotatably connected to the fixed plate 2, and the driving shaft is threadedly connected to the movable plate 6, wherein the driving shaft rotates to drive the movable plate 6 to approach or move away from the fixed plate 2. In this embodiment, the driving shaft is rotatably connected between the stopper 3 and the fixed plate 2, and the driving shaft and the movable plate 6 are threadedly connected to each other, so that the movable plate 6 can be driven to move along the axial direction of the driving shaft when the driving shaft rotates, so the driving shaft also guides the movable plate 6.

[0046] For example, Figure 1 As shown, the drive shaft includes two groups on the left and right, each group includes an upper drive shaft 5 and a lower drive shaft 4, and the two groups of drive shafts are symmetrically arranged around the axis of the driving gear 9. In this embodiment, the drive shaft is divided into two groups, and each group of drive shafts includes an upper drive shaft 5 and a lower drive shaft 4. Therefore, the number of drive shafts in this embodiment is four, and they are symmetrically arranged, and the whole is arranged in a square. At the same time, a first positioning nut 401 is set at the connection between the upper drive shaft 5 and the fixed plate 2, and a second positioning nut 501 is set at the connection between the lower drive shaft 4 and the fixed plate 2 to position the drive shaft and the fixed plate 2.

[0047] It is worth noting that the driving mechanism and four-axis drive used in this embodiment can provide stable power for the movement of the movable plate 6. Compared with the traditional single-axis drive, the four-axis drive in this application can also improve the efficiency and stability of the movement of the movable plate 6, and improve the efficiency of the sealing mechanism in sealing the valve.

[0048] In an exemplary embodiment, the blind plate 17 includes an external connection part and a matching part, the external connection part and the matching part are integrally formed, and a sealing ring 1704 is provided on the matching part, wherein when the blind plate 17 blocks the valve, the external connection part is located outside the valve, and the matching part is embedded in the valve and matches with the valve.

[0049] In this embodiment, in order to block and seal the inner hole sealing type valve, the blind plate 17 in this application is driven by the movable plate 6 to achieve synchronous movement. When the movable plate 6 gradually approaches the valve, the blind plate 17 is aligned with the corresponding part of the valve to block the valve. After the blocking is completed, the external connection part is located outside the valve, and the matching part is located at the port where the valve is sealed, and the sealing is achieved by the sealing ring 1704 on the matching part to prevent leakage of the medium.

[0050] Exemplarily, the structure of the blind plate 17 in this embodiment is as follows: Figure 6 As shown, the blind plate 17 is provided with a liquid inlet channel 1702 and a liquid outlet channel 1703, the input end of the liquid inlet channel 1702 is arranged on the external connection part, the output end of the liquid inlet channel 1702 is arranged on the matching part, the input end of the liquid outlet channel 1703 is arranged on the matching part, and the output end of the liquid outlet channel 1703 is arranged on the external connection part. Before the detection is completed, the output end of the liquid outlet channel 1703 needs to be blocked, and when the medium for detecting whether the valve is leaking is introduced, the detection medium is introduced from the liquid inlet channel 1702. Since the matching part is located inside the valve, the detection medium enters the valve from the output end of the liquid inlet channel 1702, and then the pressurization and other work required for the detection are performed, so that the valve leakage detection can be realized and the qualified or unqualified result can be obtained. After the detection is completed, the detection medium can be discharged through the top.

[0051] For example, in the present application, the detected medium can be adaptively adjusted according to the type of valve, such as liquid, gas, etc.

[0052] Exemplarily, the input end of the liquid inlet channel 1702 is set at the lowest point of the external connection part, and the output end of the liquid outlet channel 1703 is set at the highest point of the external connection part. At the same time, a medium pipeline (not shown in the figure) is also provided in the present application, which is mainly used for the inflow and discharge of the medium. The medium pipeline in the present application adopts a jointless design, and each pipeline is seamlessly welded, so it can effectively avoid rust at the connection between the pipelines, thereby improving the service life of the pipeline.

[0053] It is worth noting that, in this embodiment, the liquid inlet channel 1702 is arranged at the bottom of the blind plate 17, and the liquid outlet channel 1703 is arranged at the top of the blind plate 17, so that the detection medium can be quickly introduced, and the detection medium can fill the valve. In the prior art, liquid is generally introduced from the center hole of the blind plate 17, and the height of the detection liquid entering the valve can only reach half. The present application adopts the design of bottom water inlet and top drainage, which can maximize the liquid injection height, thereby effectively reducing the pressurization time and improving the detection efficiency of the valve.

[0054] In an exemplary embodiment, the adjustment assembly includes a first guide rail 13, a base plate 14 and a second guide rail 15, the first guide rail 13 is arranged on the side wall where the movable plate 6 and the fixed plate 2 are close to each other, the base plate 14 is slidably connected to the first guide rail 13, and the second guide rail 15 is arranged on the base plate 14, wherein the extension direction of the first guide rail 13 and the extension direction of the second guide rail 15 are perpendicular to each other, the base plate 14 is provided with a mounting plate 16 slidably connected to the second guide rail 15, and the blind plate 17 is detachably connected to the mounting plate 16.

[0055] In this embodiment, by setting the first guide rail 13 and the bottom plate 14, and the second guide rail 15 and the mounting plate 16, and the first guide rail 13 and the second guide rail 15 are perpendicular to each other, the movement of the installation in the horizontal direction and the vertical direction is realized, so that the position of the mounting plate 16 can be quickly adjusted, and finally the position of the blind plate 17 can be adjusted so that the blind plate 17 is aligned with the valve, which is convenient for blocking the valve.

[0056] Illustratively, in this embodiment, a plurality of mounting holes 1701 are provided on the back of the blind plate 17, and a plurality of connecting screws corresponding to the mounting holes 1701 can be provided on the mounting plate 16 to connect the blind plate 17 and the mounting plate 16, and in this embodiment, the blind plate 17 is provided at the center of the mounting plate 16.

[0057] Exemplarily, in this embodiment, the adjustment component also includes a lifting adjuster 11 and a horizontal adjuster 12. The output end of the lifting adjuster 11 is connected to the base plate 14 for driving the base plate 14 to move along the first guide rail 13. The output end of the horizontal adjuster 12 is connected to the mounting plate 16 for driving the mounting plate 16 to move along the second guide rail 15.

[0058] In this embodiment, the lifting regulator 11 is arranged at the top of the movable plate 6, and adopts the transmission mode of motor and screw. The screw is threadedly connected to the base plate 14. When the screw rotates, it drives the base plate 14 to move up and down to adjust the position of the blind plate 17 in the vertical direction. The horizontal regulator 12 adopts the transmission mode of cylinder. The output end of the cylinder is connected to the side wall of the mounting plate 16. The cylinder can drive the mounting plate 16 to move along the second guide rail 15.

[0059] It is worth noting that the lifting adjuster 11 and the horizontal adjuster 12 in this embodiment can also be replaced by other transmission devices that can drive the bottom plate 14 and the mounting plate 16 to move.

[0060] It should also be noted that in this embodiment, a limiting portion may be provided on the first guide rail 13 or the second guide rail 15 to limit the bottom plate 14 and the mounting plate 16 to prevent the two from falling off.

[0061] It should also be noted that the blind plate 17 in this embodiment realizes the movement of the blind plate 17 in six directions through the movement of the movable plate 6, the movement of the bottom plate 14, and the movement of the mounting plate 16, so as to facilitate the precise matching of the blind plate 17 with the valve. During specific use, four rollers 18 are also provided at the bottom of the movable plate 6, and the rollers 18 can roll on the base 1 to facilitate the movement of the movable plate 6.

[0062] In an exemplary embodiment, the placement mechanism includes a placement seat 19 and an adjustment seat 22 . The adjustment seat 22 can move along the length direction of the placement seat 19 , and the positioning plate 23 is rotatably connected to the adjustment seat 22 .

[0063] In this embodiment, an adjusting seat 22 is provided, which can be moved on the placement seat 19, so that after the valve is installed on the adjusting seat 22, the valve can cooperate with the blind plate 17 on the fixed plate 2 to seal the right side detection port of the valve. After the sealing is completed, the blind plate 17 on the movable plate 6 is moved to seal the detection port on the left side of the valve to achieve the sealing of the valve. At the same time, the positioning plate 23 provided can position the placed valve and realize the rotation function, so that the placement angle of the valve can be freely adjusted.

[0064] Exemplarily, in this embodiment, the adjustment seat 22 moves in a manner that the driving seat 20 drives the screw rod 21 to rotate, and a nut seat cooperating with the screw rod 21 is provided at the bottom of the adjustment seat 22, thereby enabling the adjustment seat 22 to move horizontally.

[0065] Specific implementation steps: the first step is to install the blind plate 17, and install the blind plates 17 on both sides onto the mounting plate 16; the second step is to place the valve on the positioning plate 23 for fixing, adjust the position of the positioning plate 23, and control its rotation so that the left and right ports of the valve are parallel to the axis of the blind plate 17; the third step is to control the position of the blind plate 17 so that the central axis of the blind plate 17 is aligned with the axis of the valve port to ensure the precise fit of the blind plate 17 when entering the valve; the fourth step is to start the driving mechanism, and the driving mechanism drives the movable plate 6 to move toward the fixed plate 2 until the blind plate 17 enters the valve to achieve blocking; the fifth step is to perform a pressure test, and introduce the detection medium into the valve through the liquid inlet channel 1702 of the blind plate 17, and then increase the pressure to observe whether the valve leaks. After the test is completed, the detection medium is discharged from the liquid outlet channel 1703. After the test results are obtained, the movable plate 6 moves left, and the adjusting seat 22 moves left to make the valve and the blind plates 17 on both sides fall off. The valve can be removed by a crane to complete a test cycle.

[0066] In summary, the utility model can conveniently realize the centering of the blind plate 17 and the valve by means of the drive mechanism and the adjustment assembly. At the same time, the low-inlet and high-outlet water inlet method is adopted for detection, which greatly reduces the pressurization time during detection, thereby effectively improving the detection efficiency of the valve.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A valve pressure testing device, characterized in that: include: A base, wherein a fixing plate and a limiting member are provided on the base, and a driving shaft is provided between the fixing plate and the limiting member; A movable plate, the movable plate is arranged on the driving shaft, a driving mechanism is arranged on the movable plate, and the driving mechanism can drive the movable plate to approach or move away from the fixed plate along the axial direction of the driving shaft; A blocking mechanism is arranged on the side walls opposite to the fixed plate and the movable plate, the blocking mechanism comprises an adjusting component and a blind plate, the adjusting component is used to adjust the position of the blind plate to correspond to the valve; A placing mechanism is arranged between the movable plate and the fixed plate, and the placing mechanism comprises a positioning plate for positioning the valve.

2. The valve pressure testing device according to claim 1, characterized in that: The driving mechanism includes a driving gear, a driven gear and a driver. The driving gear is rotatably connected to the moving plate. The driven gear is rotatably connected to the moving plate and is coaxially connected to the driving shaft. The driven gears are all meshed with the driving gear. The driver is arranged on the moving plate. The output end of the driver is coaxially connected with the driving gear, and the driving gear is meshed with the driving gear.

3. The valve pressure testing device according to claim 2, characterized in that: One end of the driving shaft is rotatably connected to the limiting member, and the other end is rotatably connected to the fixed plate. The driving shaft is threadedly connected to the movable plate, wherein the driving shaft rotates to drive the movable plate to approach or move away from the fixed plate.

4. The valve pressure testing device according to claim 2, characterized in that: The drive shafts include two left and right groups, each group includes an upper drive shaft and a lower drive shaft, and the two groups of drive shafts are symmetrically arranged around the axis of the driving gear.

5. The valve pressure testing device according to claim 1, characterized in that: The blind plate includes an external connection part and a matching part, the external connection part and the matching part are integrally formed, and a sealing ring is provided on the matching part. When the blind plate blocks the valve, the external connection part is located outside the valve, and the matching part is embedded in the valve and matched with the valve.

6. The valve pressure testing device according to claim 5, characterized in that: The blind plate is provided with a liquid inlet channel and a liquid outlet channel, the input end of the liquid inlet channel is arranged on the external connection part, the output end of the liquid inlet channel is arranged on the matching part, the input end of the liquid outlet channel is arranged on the matching part, and the output end of the liquid outlet channel is arranged on the external connection part.

7. The valve pressure testing device according to claim 6, characterized in that: The input end of the liquid inlet channel is arranged at the lowest point of the external connection part, and the output end of the liquid outlet channel is arranged at the highest point of the external connection part.

8. The valve pressure testing device according to claim 1, characterized in that: The adjustment assembly includes a first guide rail, a base plate and a second guide rail, wherein the first guide rail is arranged on the side wall where the movable plate and the fixed plate are close to each other, the base plate is slidably connected to the first guide rail, and the base plate is provided with a second guide rail, wherein the extension direction of the first guide rail is perpendicular to the extension direction of the second guide rail, and the base plate is provided with a mounting plate slidably connected to the second guide rail, and the blind plate is detachably connected to the mounting plate.

9. The valve pressure testing device according to claim 8, characterized in that: The adjustment component also includes a lifting adjuster and a horizontal adjuster. The output end of the lifting adjuster is connected to the base plate to drive the base plate to move along the first guide rail. The output end of the horizontal adjuster is connected to the mounting plate to drive the mounting plate to move along the second guide rail.

10. The valve pressure testing device according to claim 1, characterized in that: The placing mechanism comprises a placing seat and an adjusting seat. The adjusting seat can move along the length direction of the placing seat, and the positioning plate is rotatably connected to the adjusting seat.

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