Valve sealing test device

Abstract

The invention relates to the field of valve sealing tests, in particular to a valve sealing test device which comprises a test board, a moving frame is arranged on the upper portion of the test board, a placing plate is arranged on the moving frame, a fixing mechanism used for fixing a plurality of exhaust valves is arranged on the placing plate, and a water tank is arranged on the upper portion of the test board. When the exhaust valve is subjected to a sealing test, the test environment conforms to the working conditions of pressure, temperature, vibration, mounting angle and the like during actual use of the exhaust valve by utilizing the cooperation of the variable frequency water pump, the heating pipe and the rotating cylinder, the problem that a traditional static test result deviates from real performance is solved, and the accuracy of the test result is greatly improved; meanwhile, the exhaust valve is inverted to measure the liquid leakage amount, the blank of quantitative detection of the liquid leakage amount in a special scene is filled up, the potential safety hazard that the liquid leakage amount exceeds the standard in practical application when the test is qualified is avoided, and the device can meet the high-precision test requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valve sealing test, in particular to a valve sealing test device. BACKGROUND

[0002] As a key component for discharging gas and ensuring smooth delivery of medium in pipeline systems, exhaust valves are widely used in various fluid delivery scenarios such as water supply and drainage, heating, industrial circulating water, agricultural irrigation, etc. The sealing performance of the exhaust valve directly affects the operating efficiency and safety of the system, so it needs to be verified by sealing test before delivery or installation.

[0003] Currently, the sealing test of the exhaust valve mostly adopts qualitative or semi-quantitative bubble observation method: the exhaust valve is connected with the water pipe of the test bench, the upper part of the exhaust valve is pressed tightly by mechanical structure (such as air cylinder driven pressure plate) to ensure its sealing with the water pipe, then water is filled into the inside of the exhaust valve and the whole is sunk into the water tank, the water in the inside of the exhaust valve drives the floating ball inside to move up to block the exhaust port, then whether bubbles are generated in the water tank is observed to judge the sealing performance, if the bubbles disappear, it is determined that the sealing is qualified.

[0004] This test method only simulates the static water filling condition when testing the exhaust valve, without considering the influence of the combined working conditions such as pressure and temperature of the conveying medium in the pipeline on the exhaust valve installed on the conveying pipeline, resulting in deviation between the test result and the actual use performance; in addition, the actual leakage amount of the exhaust valve is not quantitatively detected by only judging the sealing performance by "whether there are bubbles", the small leakage of the exhaust valve in high-precision process systems (such as exhaust valve on purified water pipeline in pharmaceutical factory) or high-pressure special equipment (exhaust valve on steam boiler) may cause medium pollution or safety hazards, but the existing method cannot meet the detection needs of such scenes, further reducing the practicality of the device. SUMMARY

[0005] In view of the above problems, the valve sealing test device provided by the embodiments of the present application can make the test environment meet the working conditions such as pressure, temperature, vibration and installation angle of the exhaust valve in actual use, ensure the accuracy of the test result, and can quantitatively test the leakage amount of the exhaust valve, which can meet the high-precision test needs.

[0006] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions: the present application provides a valve sealing test device, which comprises a test bench, a moving frame is arranged on the upper part of the test bench, a placing plate is arranged on the moving frame, a fixing mechanism for fixing a plurality of exhaust valves is arranged on the placing plate, a water tank is arranged on the upper part of the test bench, a plurality of heating pieces for changing the temperature of the water solution in the water tank are arranged in the water tank, and a test assembly for sealing test of the exhaust valve is arranged on the water tank.

[0007] The fixing mechanism comprises a gas cylinder fixedly arranged on the horizontal section of the placement plate, a pressing plate fixedly arranged at the telescopic end of the gas cylinder, an installation block fixedly arranged on the upper portion of the pressing plate, and a detection piece arranged on the rear side of the installation block and used for detecting whether the exhaust valve obviously leaks liquid.

[0008] The test assembly comprises an installation plate fixedly arranged on the upper end inside the sink, a variable frequency water pump fixedly arranged on the bottom of the installation plate, a water suction pipe communicatively arranged at the water inlet end of the variable frequency water pump, the water suction pipe being located inside the sink at the end away from the variable frequency water pump, and a water outlet pipe communicatively arranged at the water outlet end of the variable frequency water pump.

[0009] The upper portion of the installation plate is provided with a plurality of measurement assemblies used for measuring the liquid leakage amount of the exhaust valve, each measurement assembly comprising an electronic scale fixedly arranged on the upper portion of the installation plate and a measuring cylinder placed on the upper portion of the electronic scale.

[0010] According to an advantageous embodiment, the front side of the test bench is fixedly provided with a driving assembly for driving the movement of the moving frame, the driving assembly comprising two guide rails fixedly arranged on the front side of the test bench, an electric sliding block slidingly arranged on each guide rail, a connecting plate fixedly arranged on the front side of the two electric sliding blocks, and two vertical plates fixedly arranged on the bottom of the connecting plate and symmetrically distributed left and right.

[0011] According to an advantageous embodiment, the moving frame comprises a horizontal plate fixedly arranged on the bottom of the two vertical plates, support plates fixedly arranged on the upper portion of the horizontal plate and symmetrically distributed left and right, a rectangular plate fixedly arranged on the upper portion of each support plate, and a rotary air cylinder fixedly arranged on the right side of the right support plate, the left end of the rotary air cylinder being rotatably connected to the right side of the placement plate, and the left side of the placement plate being rotatably connected to the right side of the left rectangular plate.

[0012] According to an advantageous embodiment, the upper portion of the placement plate is fixedly provided with a plurality of water guide pipes, the end of the water outlet pipe away from the variable frequency water pump is in communication with the water guide pipes, the exhaust valve is located at the upper end of the water guide pipes, and the bottom of the pressing plate abuts against the upper portion of the exhaust valve.

[0013] According to an advantageous embodiment, the rear side of the installation block is provided with an installation groove, and the detection piece comprises a U-shaped plug block slidingly inserted into the installation groove, a placement block fixedly arranged on the rear side of the U-shaped plug block and penetrating through the installation groove, the placement block being located at the exhaust port of the exhaust valve, a placement groove being formed in the interior of the placement block, and test paper being arranged in the placement groove.

[0014] According to an advantageous embodiment, the side of the U-shaped plug block away from the placement block and the inner wall of the installation groove are both fixedly provided with magnets, and the two magnets are magnetically attracted.

[0015] According to an advantageous embodiment, the interior of the sink is fixedly provided with a plurality of partition plates, the sink is divided into a plurality of water storage areas by the plurality of partition plates, the heating piece comprises a heating pipe fixedly arranged on the lower end inside each water storage area, and a temperature sensor is fixedly arranged in the interior of each water storage area.

[0016] According to an advantageous embodiment, the bottom of the water guide pipe is provided with a backwater pipe, the bottom end of the backwater pipe is located in the water storage area, and an electromagnetic valve is installed on the backwater pipe.

[0017] According to an advantageous embodiment, the upper part of the placing plate is fixedly provided with a guide rod, the front side of the pressing plate is fixedly provided with a guide block matched with the guide rod, and the guide block is in sliding connection with the guide rod.

[0018] According to an advantageous embodiment, the measuring cylinder is a transparent glass cylinder, and a scale line is arranged outside the measuring cylinder, and a liquid guide block is fixedly arranged at the upper end of the inside of the measuring cylinder.

[0019] Compared with the prior art, the valve sealing test device provided by the embodiment of the application has the following beneficial effects: 1、The application uses the cooperation of the frequency conversion water pump, the heating pipe and the rotary cylinder to make the test environment meet the pressure, temperature, vibration and installation angle and other working conditions when the exhaust valve is actually used, solve the problem of deviation between the traditional static test result and the real performance, greatly improve the accuracy of the test result; At the same time, the exhaust valve can be inverted to measure the liquid leakage amount, fill the blank of quantitative detection of liquid leakage in special scenarios, avoid the safety hazard of "test qualified but liquid leakage exceeds the standard in actual application", so that the device can meet the high-precision test requirement.

[0020] 2、The application sets the test assembly, the detection piece, the heating piece and the rotary cylinder, uses the frequency conversion water pump to transport the water solution to simulate the pipeline flow rate and vibration, uses the heating piece to adjust the water temperature to simulate the working condition of different water temperatures, and uses the rotary cylinder to realize the multi-angle installation simulation of the exhaust valve, so that the sealing performance of the exhaust valve in the actual use working condition can be more truly simulated, and the accuracy of the sealing performance test result of the exhaust valve is ensured.

[0021] 3、The application sets the measurement assembly, the rotary cylinder can drive the exhaust valve preliminarily detected to be qualified to rotate and invert, then the solution leaked from the exhaust valve can enter the measuring cylinder, so that the liquid leakage amount of the exhaust valve can be quantitatively detected, the device can meet the high-precision detection requirement, and the practicality of the device is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural diagram of the application.

[0023] Figure 2 It is a sectional view of the application.

[0024] Figure 3 It is an internal structure diagram of the water tank in the application.

[0025] Figure 4It is the connection structure diagram of the mobile frame and the placing plate in the application.

[0026] Figure 5 It is the sectional view of the connecting structure diagram of the mounting block and the detection piece in the application.

[0027] Figure 6 It is the state diagram when the exhaust valve is inverted in the application.

[0028] Figure 7 It is Figure 6 The enlarged view of the structure of part A in the application.

[0029] The reference signs in the figure: 1, test bench; 2, mobile frame; 21, horizontal plate; 22, supporting plate; 23, rectangular plate; 24, rotary air cylinder; 3, placing plate; 4, fixing mechanism; 41, air cylinder; 42, pressing plate; 43, mounting block; 44, guide rod; 45, guide block; 5, water tank; 6, heating piece; 61, heating pipe; 7, test assembly; 71, mounting plate; 72, variable frequency water pump; 73, water suction pipe; 74, water outlet pipe; 8, detection piece; 81, U-shaped plug-in block; 82, placing block; 83, test paper; 9, measuring assembly; 91, electronic scale; 92, measuring cylinder; 93, liquid guide block; 10, driving assembly; 101, guide rail; 102, electric sliding block; 103, connecting plate; 104, vertical plate; 11, water guide pipe; 12, magnet; 13, partition plate; 14, temperature sensor; 15, backwater pipe; 16, exhaust valve. DETAILED DESCRIPTION

[0030] The following will be described in detail in combination with the accompanying Figure 1 - Figure 7 The application will be further described in detail.

[0031] Please refer to Figure 1 A valve sealing test device, comprising a test bench 1, the upper part of the test bench 1 is provided with a mobile frame 2, the mobile frame 2 is provided with a placing plate 3, the placing plate 3 is provided with a fixing mechanism 4 for fixing a plurality of exhaust valves 16, the upper part of the test bench 1 is provided with a water tank 5, the inside of the water tank 5 is provided with a plurality of heating pieces 6 for changing the temperature of the water solution (the water solution is a dye water solution) inside, the water tank 5 is provided with a test assembly 7 for sealing test of the exhaust valve 16.

[0032] Refer to Figure 2 The test assembly 7 comprises a mounting plate 71 fixedly arranged at the upper end inside the water tank 5, the bottom of the mounting plate 71 is fixedly provided with a variable frequency water pump 72, the water inlet end of the variable frequency water pump 72 is communicatively provided with a water suction pipe 73, the end of the water suction pipe 73 away from the variable frequency water pump 72 is located in the water tank 5, and the water outlet end of the variable frequency water pump 72 is communicatively provided with a water outlet pipe 74.

[0033] Refer to Figure 2 andFigure 4 The fixing mechanism 4 comprises a cylinder 41 fixedly arranged on the horizontal section of the placing plate 3, a pressing plate 42 fixedly arranged at the telescopic end of the cylinder 41, a plurality of water guide pipes 11 fixedly arranged on the upper portion of the placing plate 3, a water outlet pipe 74 in communication with the water guide pipes 11 at the end away from the variable frequency water pump 72, an exhaust valve 16 located at the upper end of the water guide pipes 11, and the bottom of the pressing plate 42 abutting against the upper portion of the exhaust valve 16. The upper portion of the placing plate 3 is fixedly arranged with a guide rod 44, and the front side of the pressing plate 42 is fixedly arranged with a guide block 45 used in cooperation with the guide rod 44, and the guide block 45 is slidingly connected with the guide rod 44.

[0034] When the exhaust valve 16 is tested for sealing, the exhaust valve 16 is placed on the upper portion of the corresponding water guide pipe 11, then the cylinder 41 works to drive the pressing plate 42 to move downward, the pressing plate 42 moves downward to press the upper portion of the exhaust valve 16, so as to ensure the close connection between the exhaust valve 16 and the water guide pipe 11, then the variable frequency water pump 72 works to draw the aqueous solution from the water tank 5 by the water suction pipe 73, the dye aqueous solution in the water tank 5 enters the inside of the water guide pipe 11 through the water outlet pipe 74, and then enters the inside of the exhaust valve 16 through the water guide pipe 11, so as to test the sealing property of the exhaust valve 16.

[0035] Referring to Figure 1 , Figure 4 and Figure 5 , the upper portion of the pressing plate 42 is fixedly arranged with a mounting block 43, the rear side of the mounting block 43 is provided with a detection piece 8 for detecting whether the exhaust valve 16 obviously leaks liquid, the rear side of the mounting block 43 is provided with a mounting groove, the detection piece 8 comprises a U-shaped plug block 81 slidingly inserted into the mounting groove, the rear side of the U-shaped plug block 81 penetrates through the mounting groove and is fixedly arranged with a placing block 82, the placing block 82 is located at the exhaust port of the exhaust valve 16, the inside of the placing block 82 is provided with a placing groove, and the placing groove is provided with a test paper 83.

[0036] Referring to Figure 5 , the side of the U-shaped plug block 81 away from the placing block 82 and the inner wall of the mounting groove are fixedly arranged with magnets 12, and the two magnets 12 are magnetically attracted.

[0037] After the exhaust valve 16 is fixed on the water guide pipe 11, the U-shaped plug 81 can be inserted into the installation groove on the installation block 43, and the U-shaped plug 81 can be stably fixed on the installation block 43 by magnetic adsorption of the two magnets 12. Then, the test paper 83 (the test paper 83 is white) is placed in the placement groove on the placement block 82. When the water solution in the water tank 5 enters the inside of the exhaust valve 16 through the water guide pipe 11, if the exhaust function of the exhaust valve 16 is normal, the internal air will be discharged through the exhaust port of the exhaust valve 16 and blow the test paper 83 (the test paper 83 should appear obvious shaking or floating). If the test paper 83 is not blown, it may indicate that the exhaust port is blocked or the float in the exhaust valve 16 is stuck, and the exhaust valve 16 needs to be replaced.

[0038] When the exhaust valve 16 can normally exhaust, the staff observes whether the test paper 83 is discolored. If the test paper 83 is obviously discolored, it indicates that the water solution entering the inside of the exhaust valve 16 splashes on the test paper 83, so that the sealing effect of the exhaust valve 16 is poor. If the test paper 83 is not obviously discolored, it indicates that the sealing effect of the exhaust valve 16 is good, and the preliminary inspection is qualified.

[0039] During the sealing test, the flow of the water solution is adjusted by the variable frequency water pump 72, so that the rate of the water solution entering the inside of the exhaust valve 16 can be changed. By changing the rate, the vibration working condition of the exhaust valve 16 installed on the conveying pipeline due to factors such as fluid flow can be simulated, so that the sealing performance of the exhaust valve 16 under different vibration conditions can be more accurately detected, and the accuracy of the test result is ensured.

[0040] Referring to Figure 2 , the bottom of the water guide pipe 11 is communicatively provided with a backwater pipe 15, the bottom end of the backwater pipe 15 is located in the water storage area, and an electromagnetic valve is installed on the backwater pipe 15.

[0041] After the test of the exhaust valve 16 is completed, the electromagnetic valve on the backwater pipe 15 can be opened, and then the water solution in the inside of the water guide pipe 11 can be returned to the water tank 5 through the backwater pipe 15, so that the water solution in the water tank 5 can be recycled.

[0042] Referring to Figure 3 , a plurality of partitions 13 are fixedly arranged in the inside of the water tank 5, the plurality of partitions 13 divide the water tank 5 into a plurality of water storage areas, the heating element 6 includes a heating pipe 61 fixedly arranged at the lower end of the inside of the water storage area, and a temperature sensor 14 is fixedly arranged in the inside of the water storage area.

[0043] When the sealing performance of the exhaust valve 16 is tested, the water solution in the water tank 5 can be heated by the heating pipe 61, and the water solution in the water tank 5 can be heated to a set test temperature by the cooperation of the temperature sensor 14, so that the temperature of the water solution entering the interior of the exhaust valve 16 can be changed, the sealing performance of the exhaust valve 16 under different temperature conditions can be comprehensively detected by changing the temperature of the water solution, the test is more in line with the actual use condition of the exhaust valve 16, and therefore the accuracy of the test result of the exhaust valve 16 is further improved.

[0044] Meanwhile, by cooperating with the frequency conversion water pump 72, the sealing performance of the exhaust valve 16 under more different use conditions can be simulated, for example, the water solution entering the interior of the exhaust valve 16 can be normal water pressure-normal temperature water solution, normal water pressure-high temperature water solution, low water pressure-high temperature water solution, etc., and therefore the sealing performance of the exhaust valve 16 under different use conditions is further simulated.

[0045] Referring to Figure 1 , Figure 2 and Figure 4 , the front side of the test bench 1 is fixedly provided with a driving assembly 10 for driving the movement of the moving frame 2, the driving assembly 10 comprises two guide rails 101 fixedly arranged on the front side of the test bench 1, an electric sliding block 102 is slidably arranged on the guide rail 101, the front sides of the two electric sliding blocks 102 are fixedly provided with a connecting plate 103, and the bottom of the connecting plate 103 is fixedly provided with two vertical plates 104 which are symmetrically distributed.

[0046] Referring to Figure 2 and Figure 4 , the moving frame 2 comprises a horizontal plate 21 fixedly arranged at the bottom of the two vertical plates 104, the upper part of the horizontal plate 21 is fixedly provided with two supporting plates 22 which are symmetrically distributed, the upper part of the supporting plate 22 is fixedly provided with a rectangular plate 23, the right side of the right supporting plate 22 is fixedly provided with a rotary air cylinder 24, the left end of the rotary air cylinder 24 is rotatably connected with the right side of the placement plate 3, and the left side of the placement plate 3 is rotatably connected with the right side of the left rectangular plate 23.

[0047] When the sealing performance of the exhaust valve 16 is tested, the placement plate 3 can be driven to rotate by the rotary air cylinder 24, so that the test angle of the exhaust valve 16 can be adjusted by changing the angle of the placement plate 3, so as to simulate that in actual engineering application, the installation angle of the exhaust valve 16 is difficult to keep in a vertical installation state due to factors such as the direction of the pipeline and the spatial layout, so that the sealing performance of the exhaust valve 16 under different installation angles can be comprehensively and accurately evaluated.

[0048] Referring to Figure 1 , Figure 2 , Figure 6 and Figure 7The upper portion of the mounting plate 71 is provided with a plurality of sets of measuring assemblies 9 for measuring the amount of liquid leakage of the exhaust valve 16. The measuring assembly 9 comprises an electronic scale 91 (which can be a high-precision electronic scale such as a micro-precision balance or a laboratory analytical balance) fixedly arranged on the upper portion of the mounting plate 71. The upper portion of the electronic scale 91 is provided with a measuring cylinder 92.

[0049] Referring to Figure 7 The measuring cylinder 92 is a transparent glass cylinder and is provided with a scale line on the outside. The inside upper end of the measuring cylinder 92 is fixedly provided with a liquid guide block 93.

[0050] In order to quantitatively detect the actual amount of liquid leakage of the exhaust valve 16 that has passed the initial inspection, it can be applied to high-precision process systems (such as purified water pipelines in pharmaceutical factories, where the amount of water leakage needs to be controlled to be below 0.01 mL / min) or high-pressure special equipment (such as steam boilers, where the amount of water leakage needs to be controlled to be below 0.0005 mL / min). When the exhaust valve 16 does not obviously leak through the test paper 83, the detection piece 8 is detached from the mounting block 43. Then, the rotating cylinder 24 can drive the placement plate 3 to rotate one hundred and eighty degrees, thereby driving the exhaust valve 16 to rotate one hundred and eighty degrees to an inverted state. Then, the electric sliding block 102 slides downward on the guide rail 101 to drive the placement plate 3 to move downward. The placement plate 3 moves downward to drive the exhaust valve 16 to move downward. When the exhaust valve 16 contacts the upper portion of the measuring cylinder 92, it stops moving (as shown in Figure 6 The exhaust valve 16 is inverted for a set time to capture extremely small leaks. During this time, the water solution leaks out through the exhaust port and flows into the measuring cylinder 92. At this time, the water solution flows into the measuring cylinder 92 through the liquid guide block 93. Then, the electronic scale 91 can measure the amount of liquid leakage of the exhaust valve 16 within a specified time. The volume of the leaked liquid is visually read through the scale line on the outside of the measuring cylinder 92 and cross-verified with the data of the electronic scale 91. Then, according to the value of the amount of liquid leakage, it can be indirectly judged whether the exhaust valve 16 can be used on the purified water pipeline in the pharmaceutical factory or on the steam boiler, which can meet the high-precision testing requirements.

[0051] Specifically, first, the exhaust valve 16 is placed on the water guide pipe 11, then the pressure plate 42 is driven to move downward by the air cylinder 41 to position the exhaust valve 16 on the water guide pipe 11, then the U-shaped plug 81 is installed on the mounting block 43, then the test paper 83 is placed in the placement slot on the placement block 82, and then the water solution is pumped from the water tank 5 into the exhaust valve 16 by operating the frequency conversion water pump 72. At this time, whether the exhaust of the exhaust valve 16 is normal can be tested according to whether the test paper 83 shakes or drifts. If it is not normal, the exhaust valve 16 is replaced. If it is normal, whether the test paper 83 is discolored is observed. If the test paper 83 is obviously discolored, it indicates that the water solution splashed into the exhaust valve 16 splashed onto the test paper 83, so that the sealing effect of the exhaust valve 16 is poor. If the test paper 83 is not obviously discolored, it indicates that the sealing effect of the exhaust valve 16 is good.

[0052] During the test, the frequency conversion water pump 72 is used to deliver the water solution to simulate the pipeline flow rate and vibration, the heating element 6 is used to adjust the water temperature to simulate different water temperature conditions, and the rotary air cylinder 24 is used to realize multi-angle installation of the exhaust valve 16 to simulate the sealing performance of the exhaust valve 16 in actual use conditions, so that the accuracy of the sealing performance test of the exhaust valve 16 is further improved.

[0053] Through the cooperation of the driving assembly 10 and the rotary air cylinder 24, the exhaust valve 16 can be inverted, and then the liquid leakage amount of the exhaust valve 16 can be measured through the cooperation of the measuring assembly 9 to determine whether the exhaust valve 16 can be used on the purified water pipeline of a pharmaceutical factory or on a steam boiler, so that the device can meet the high-precision test requirement.

[0054] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0055] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection", "installation", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] The embodiments of the present application are preferred embodiments of the present application, and do not limit the protection scope of the present application, and thus, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A valve sealing test apparatus, comprising a test bench, characterized in that: The upper part of the test bench is provided with a movable frame, the movable frame is provided with a placement plate, the placement plate is provided with a fixing mechanism for fixing multiple exhaust valves, the upper part of the test bench is provided with a water tank, the inside of the water tank is provided with multiple heating elements for changing the temperature of the water solution inside, and the water tank is provided with a test component for sealing test of the exhaust valves. The fixing mechanism includes a cylinder fixedly installed on the horizontal section inside the placement plate. A pressure plate is fixedly installed on the telescopic end of the cylinder. An installation block is fixedly installed on the upper part of the pressure plate. A detection element for detecting whether the exhaust valve is obviously leaking is installed on the rear side of the installation block. The test assembly includes a mounting plate fixedly installed inside the upper part of the water tank. A variable frequency water pump is fixedly installed at the bottom of the mounting plate. A water pump is connected to the water inlet end of the variable frequency water pump. The end of the water pump away from the variable frequency water pump is located inside the water tank. A water outlet end of the variable frequency water pump is connected to the water outlet pipe. The upper part of the mounting plate is provided with multiple sets of measuring components for measuring the leakage of the exhaust valve. The measuring components include an electronic scale fixedly mounted on the upper part of the mounting plate, and a measuring cylinder is placed on the upper part of the electronic scale.

2. The valve sealing test device according to claim 1, characterized in that, The front side of the test bench is fixedly equipped with a drive assembly for moving the moving frame. The drive assembly includes two guide rails fixedly installed on the front side of the test bench. Electric sliders are slidably installed on the guide rails. A connecting plate is fixedly installed on the front of the two electric sliders. Two vertical plates symmetrically distributed on the left and right are fixedly installed on the bottom of the connecting plate.

3. The valve sealing test device according to claim 2, characterized in that, The movable frame includes a horizontal plate fixedly installed at the bottom of two vertical plates. A support plate symmetrically distributed on the upper part of the horizontal plate is fixedly installed. A rectangular plate is fixedly installed on the upper part of the support plate. A rotary cylinder is fixedly installed on the right side of the right support plate. The left end of the rotary cylinder is rotatably connected to the right side of the placement plate, and the left side of the placement plate is rotatably connected to the right side of the left rectangular plate.

4. The valve sealing test device according to claim 1, characterized in that, Multiple water guide pipes are fixedly installed on the upper part of the placement plate. The end of the water outlet pipe away from the variable frequency water pump is connected to the water guide pipe. The air vent valve is located at the upper end of the water guide pipe, and the bottom of the pressure plate abuts against the upper part of the air vent valve.

5. The valve sealing test device according to claim 1, characterized in that, The mounting block has a mounting groove on its rear side. The testing component includes a U-shaped plug that slides into the mounting groove. The rear side of the U-shaped plug extends through the mounting groove and is fixedly provided with a placement block. The placement block is located at the exhaust port of the exhaust valve. The placement block has a placement groove inside, and a test paper is placed in the placement groove.

6. The valve sealing test device according to claim 5, characterized in that, Magnets are fixedly installed on the side of the U-shaped insert away from the placement block and on the inner wall of the mounting groove, and the two magnets are magnetically attracted to each other.

7. The valve sealing test device according to claim 1, characterized in that, The water tank is fixedly equipped with multiple partitions, which divide the water tank into several water storage areas. The heating element includes a heating pipe fixedly installed at the lower end of the water storage area, and a temperature sensor is fixedly installed inside the water storage area.

8. A valve sealing test device according to claim 4, characterized in that, The bottom of the water pipe is connected to a return water pipe, the bottom end of which is located in the water storage area, and a solenoid valve is installed on the return water pipe.

9. A valve sealing test device according to claim 1, characterized in that, A guide rod is fixedly installed on the upper part of the placement plate, and a guide block that works in conjunction with the guide rod is fixedly installed on the front side of the pressure plate, and the guide block is slidably connected to the guide rod.

10. A valve sealing test device according to claim 1, characterized in that, The measuring cylinder is a transparent glass cylinder with scale lines on its outside, and a liquid guiding block is fixedly installed at the upper inside of the measuring cylinder.

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