Manual diaphragm valve service life testing device

Abstract

The invention discloses a manual diaphragm valve service life testing device, and relates to the field of valve testing equipment. The device comprises a base, a top frame and a plurality of groups of liquid bins, the base is provided with a strip-shaped base, a side plate and a first sliding frame, and the top frame is provided with a second sliding frame and a testing mechanism. According to the device, tests under different media can be achieved through multiple sets of liquid bins, the automation degree is high, the media can be automatically positioned, clamped and switched, and valves can be automatically opened and closed, a flushing mechanism is further arranged and used for flushing residual media in the diaphragm valve, a torque sensor and a control system are arranged, torque can be monitored in real time, and tests can be accurately controlled. The valve is opened and closed through signal transmission of the sensor, it is guaranteed that each opening and closing process is within the control range, the accuracy of the test result is guaranteed, diaphragm valves of different specifications can be tested, the test efficiency and accuracy are greatly improved, and the device is suitable for diaphragm valve life detection in various industrial scenes.

Description

Technical Field

[0001] This invention relates to the field of valve testing equipment technology, and in particular to a manual diaphragm valve life testing device. Background Technology

[0002] With the increasing level of industrial automation, valves, as key components in fluid control, directly affect the operating efficiency of the entire system due to their performance stability. Manual diaphragm valves, with their simple structure, convenient operation, and good sealing performance, are widely used in industries such as chemical, pharmaceutical, and food processing. However, because manual diaphragm valves are frequently opened and closed in actual use, their lifespan has become a significant factor affecting system reliability. Currently, there is a lack of unified standards in the industry for testing the lifespan of manual diaphragm valves, and most companies use simple repeated opening and closing tests, which makes it difficult to accurately assess the actual service life of the valves.

[0003] Existing methods for testing the lifespan of manual diaphragm valves mainly include the following: First, repeated opening and closing tests by manual operation. This method is low in cost but inefficient, and the results are greatly affected by human factors. Second, automated testing using electric drive devices. This method improves testing efficiency, but the equipment cost is high, and it has poor adaptability to different valve models. Third, testing platforms simulating actual working conditions are used. This method can more realistically reflect the actual usage of the valve, but the testing cycle is long, the equipment is complex, and the maintenance cost is high. These methods each have their advantages and disadvantages, but they all have certain limitations. For example, patents CN116907833A and CN223107219U, etc., cannot comprehensively evaluate the lifespan of manual diaphragm valves. In terms of test media, most methods can only test a single medium, while in actual industrial scenarios, diaphragm valves often need to come into contact with a variety of media with different properties. This makes it difficult for the test results of existing devices to comprehensively reflect the valve's lifespan in actual use.

[0004] Existing manual diaphragm valve life testing methods suffer from problems such as low testing efficiency, high cost, poor adaptability, and inaccurate test results, making it difficult to meet the need for rapid and accurate assessment of valve life. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention proposes a manual diaphragm valve life testing device.

[0006] The present invention proposes a manual diaphragm valve life testing device, which includes a base, a top frame and multiple liquid tanks. A strip base is fixedly installed on the base, and two sets of side plates are slidably installed on it. The two sets of side plates are located on both sides of the strip base, which can achieve relatively close movement. A first sliding frame is slidably connected to the strip base, and its sliding direction is perpendicular to the sliding direction of the side plate. A positioning frame is mounted on the first sliding frame. The positioning frame is used to fix the diaphragm valve and make the two connecting parts of the diaphragm valve face the inner walls of the two sets of side plates respectively. Multiple sets of horizontally opposite through holes are opened on the two sets of side plates. One pair of through holes is connected to a flushing mechanism for flushing the residual medium inside the diaphragm valve. The remaining pairs of through holes are connected to a liquid tank through conduits to form a circulation loop. When the two sets of side plates are separated, the first sliding frame can move along the strip base; when the two ends of the diaphragm valve are aligned with a certain pair of through holes, the two sets of side plates are clamped together, and the diaphragm valve can then connect with the corresponding liquid tank. The top frame is located above the strip base, and a second sliding frame is slidably connected to its bottom. The sliding direction of the second sliding frame is parallel to the sliding direction of the first sliding frame. A testing mechanism is installed on the second sliding frame for repeatedly opening and closing the diaphragm valve.

[0007] Preferably, the bottom of the second sliding frame is connected to the lifting frame via the first telescopic rod, and the bottom of the lifting frame is equipped with a third motor, a reducer, a torque sensor and a control system; The third motor is connected to the transmission mechanism via a reducer. The transmission mechanism is connected to the operating handle of the diaphragm valve and is used to drive the handle to rotate in order to open and close the valve. The torque sensor is located at the connection between the transmission mechanism and the operating handle and is used to monitor the driving torque value in real time and feed the data back to the control system.

[0008] Preferably, the control system includes a programmable logic controller and a drive circuit. The programmable logic controller controls the forward and reverse rotation and start / stop actions of the third motor according to a preset torque threshold and number of cycles.

[0009] Preferably, the transmission mechanism includes a crossbeam, the middle of which is horizontally connected to the transmission end of the third motor. The crossbeam is provided with a spacing adjustment mechanism and two sets of locking blocks. The spacing adjustment mechanism is used to adjust the spacing between the two sets of locking blocks. Each set of locking blocks has a locking groove at its bottom.

[0010] Preferably, the device further includes a sleeve, a rectangular handwheel is mounted on the control shaft of the diaphragm valve, a rectangular groove adapted to the handwheel is provided at the bottom of the sleeve, a push rod is mounted on the top of the sleeve, and horizontal crossbars are connected to the top two ends of the push rod. The slots of the two sets of locking blocks are engaged with the two crossbars one by one. Multiple sets of locking rods are vertically installed at the bottom of the inner cavity of the groove, and multiple sets of through holes are opened on the rectangular handwheel. The locking rods are movably engaged with the through holes.

[0011] Preferably, each through hole on the outer side wall of the two sets of side plates is vertically connected to a slide rail, and the two sets of slide rails are vertically slidably connected to the slide plate. A second telescopic rod is also installed on the outer side wall of the side plate to drive the slide plate to slide vertically. A docking cylinder is installed on the outer side wall of the slide plate. A pair of docking cylinders are connected to the liquid tank through a conduit and have two working states: when sliding upward, the docking cylinder docks with the through hole; when sliding downward, the docking cylinder is sealed by the side plate.

[0012] Preferably, the docking cylinder is inclined downward from the end near the side plate to the end away from the side plate.

[0013] Preferably, the rinsing mechanism includes a three-way pipe, one end of which is connected to one of the docking cylinders, and the other two ends are connected to a water inlet pipe and an air inlet pipe, respectively; the other docking cylinder is connected to a drain pipe, and an air pump is installed on the air inlet pipe.

[0014] Preferably, each set of liquid tanks stores different media. The liquid tanks include a media storage tank and a pressure regulating tank. The pressure regulating tank is equipped with a pressure sensor and an electric regulating valve to simulate fluid pressure under different working conditions.

[0015] Preferably, a first motor and a lead screw are installed inside the strip base. The first motor drives the lead screw to rotate. The bottom of the first sliding frame is provided with a threaded hole that matches the lead screw. The lead screw passes through the threaded hole to form a lead screw and nut transmission structure, thereby realizing the automatic sliding of the first sliding frame along the strip base. The base is equipped with a second motor and multiple sets of limiting rods. The multiple sets of limiting rods are slidably connected to two sets of side plates and play a guiding role for the two sets of side plates. The output end of the second motor is connected to a first rotating rod. The two ends of the first rotating rod are provided with threads facing opposite directions. The bottom of both sets of side plates is provided with threaded holes that are adapted to the two sets of threads of the corresponding first rotating rod, so as to realize the relative approach or separation of the two sets of side plates. Both sets of locking blocks are slidably connected to the bottom of the crossbeam. The spacing adjustment mechanism includes a fourth motor and a second rotating rod. The two ends of the second rotating rod are provided with threads facing opposite directions. Both sets of locking blocks are provided with threaded holes that are adapted to the two sets of threads of the corresponding second rotating rod, so as to realize the relative approach or separation of the two sets of locking blocks.

[0016] The manual diaphragm valve life testing device proposed in this invention has the following beneficial effects: The automated drive mechanism reduces labor costs and improves efficiency. Multiple liquid tanks can be used to test the lifespan of diaphragm valves under different media environments, meeting diverse testing needs. Simultaneously, it can simulate fluid pressures under different operating conditions, further enriching the testing scenarios and making the test results closer to actual usage. Sensor signals transmit signals to control valve opening and closing, ensuring that each opening and closing process is within the control range, guaranteeing the accuracy of the test results. A flushing mechanism is provided to easily flush away residual media inside the diaphragm valve, ensuring a clean testing environment and preventing the mixing of different media from affecting the test results. The flushing process can be coordinated with the automated operation of the device, eliminating the need for additional complex operations and improving the continuity of testing.

[0017] The torque value is set by adjusting the torque sensor, and the power arm is adjustable to adapt to the testing of different types of diaphragm valves. The control system can record and store data such as torque value and number of cycles during the test, facilitating subsequent analysis and traceability of the test data. Data analysis provides a deeper understanding of the performance variation patterns of the diaphragm valve, offering strong support for product improvement and optimization. This system can meet the testing needs of different models of manual diaphragm valves.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure during testing of the present invention; Figure 3 This is the front view of the present invention; Figure 4 This is a top view of the present invention; Figure 5 This is a side view of the present invention; Figure 6 This is a partial structural diagram of the present invention; Figure 7 This is a schematic diagram of the sleeve structure in this invention; Figure 8 This is a schematic diagram of the circuit structure of the present invention; Explanation of the labels in the diagram: 1. Base; 2. Strip base; 201. First motor; 202. Lead screw; 203. First sliding frame; 204. Positioning frame; 3. Side plate; 301. Second motor; 302. First rotating rod; 303. Limiting rod; 4. Top frame; 401. Second sliding frame; 402. First telescopic rod; 403. Locking block; 404. Lifting frame; 405. Third motor; 406. Crossbeam; 407. Fourth motor; 408. Second rotating rod; 5. Rectangular handwheel; 6. Sleeve; 601. Top rod; 602. Cross rod; 603. Locking rod; 7. Slide board; 701. Connecting cylinder; 702. Second telescopic rod; 703. Slide rail; 8. Liquid tank; 801. Conduit; 901. Water inlet pipe; 902. Drain pipe; 903. Air inlet pipe; 904. Air pump. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1-8 The above describes a manual diaphragm valve life testing device. Base Part 1 A strip-shaped base 2 is fixedly installed on the base 1, and two sets of side plates 3 are also slidably installed on it. The two sets of side plates 3 are located on both sides of the strip-shaped base 2, which can achieve relative close movement.

[0022] A first sliding frame 203 is slidably connected to the strip-shaped base 2, and its sliding direction is perpendicular to the sliding direction of the side plate 3. A positioning frame 204 is mounted on the first sliding frame 203. The positioning frame 204 is used to fix the diaphragm valve and to make the two connecting parts of the diaphragm valve face the inner walls of the two sets of side plates 3 respectively. A first motor 201 and a lead screw 202 are installed inside the strip-shaped base 2. The first motor 201 drives the lead screw 202 to rotate. The bottom of the first sliding frame 203 is provided with a threaded hole adapted to the lead screw 202. The lead screw 202 passes through the threaded hole to form a lead screw and nut transmission structure, so as to realize the automatic sliding of the first sliding frame 203 along the strip-shaped base 2.

[0023] The base 1 is also equipped with a second motor 301 and multiple sets of limiting rods 303. The multiple sets of limiting rods 303 are slidably connected to the two sets of side plates 3, and play a guiding role for the two sets of side plates 3. The output end of the second motor 301 is connected to a first rotating rod 302. The two ends of the first rotating rod 302 are provided with threads facing opposite directions. The bottom of the two sets of side plates 3 are provided with threaded holes that are adapted to the two sets of threads of the corresponding first rotating rod 302, so as to realize the relative approach or separation of the two sets of side plates 3.

[0024] Side panel in 3 parts Multiple sets of horizontally opposite through holes are opened on the two sets of side plates 3. One pair of through holes is connected to a flushing mechanism to flush the residual medium inside the diaphragm valve. The remaining pairs of through holes are connected to a liquid tank 8 through a conduit 801 to form a circulation loop.

[0025] Each through-hole on the outer side wall of the two sets of side plates 3 is vertically connected to a slide rail 703. The two sets of slide rails 703 are vertically slidably connected to a slide plate 7. A second telescopic rod 702 is also installed on the outer side wall of the side plate 3 to drive the slide plate 7 to slide vertically. A docking cylinder 701 is installed on the outer side wall of the slide plate 7. A pair of docking cylinders 701 are connected to the liquid tank 8 through a conduit 801 to form a circulation loop. The slide plate 7 is used to control the opening and closing of the docking cylinder 701 and the through-hole. When the second telescopic rod 702 drives the slide plate 7 to slide upward, the docking cylinder 701 docks with the through-hole, and the medium in the liquid tank 8 can enter the diaphragm valve through the conduit 801, the docking cylinder 701 and the through-hole. When the slide plate 7 slides downward, the docking cylinder 701 is sealed by the side plate 3 to prevent the liquid medium in the liquid tank 8 from leaking out. The docking cylinder 701 is inclined downward from the end closer to the side plate 3 to the end farther away from the side plate 3. This design helps to store the medium in a lower position.

[0026] Top frame 4 parts The top frame 4 is located above the strip base 2, and a second sliding frame 401 is slidably connected to its bottom. The sliding direction of the second sliding frame 401 is parallel to the sliding direction of the first sliding frame 203.

[0027] The bottom of the second sliding frame 401 is connected to the lifting frame 404 via the first telescopic rod 402. The bottom of the lifting frame 404 is equipped with a third motor 405, a reducer, a torque sensor, and a control system. The third motor 405 is connected to a transmission mechanism via the reducer. The transmission mechanism is connected to the operating handle of the diaphragm valve and is used to drive the handle to rotate, thereby opening and closing the valve. The torque sensor is located at the connection point between the transmission mechanism and the operating handle, and is used to monitor the driving torque value in real time and feed the data back to the control system.

[0028] The test mechanism installed on the second sliding frame 401 is used to repeatedly open and close the diaphragm valve.

[0029] Transmission mechanism The transmission mechanism includes a crossbeam 406, the middle of which is horizontally connected to the transmission end of the third motor 405. The crossbeam 406 is provided with a spacing adjustment mechanism and two sets of locking blocks 403. The spacing adjustment mechanism is used to adjust the spacing between the two sets of locking blocks 403. The bottom of each set of locking blocks 403 is provided with a locking groove.

[0030] The spacing adjustment mechanism includes a fourth motor 407 and a second rotating rod 408. The two ends of the second rotating rod 408 are provided with threads facing opposite directions. Both sets of locking blocks 403 are provided with threaded holes that match the corresponding threads of the two sets of threads on the second rotating rod 408, enabling the two sets of locking blocks 403 to move closer or further apart. By adjusting the spacing between the two sets of locking blocks 403, the engagement position with the crossbar 602 can be adjusted, thereby adjusting the power arm and switching the power level to meet the testing requirements of different types of diaphragm valves.

[0031] The device also includes a sleeve 6, a rectangular handwheel 5 mounted on the control shaft of the diaphragm valve, a rectangular groove at the bottom of the sleeve 6 that matches the handwheel, and a push rod 601 mounted on the top of the sleeve 6. The top two ends of the push rod 601 are connected to horizontal crossbars 602, and the slots of two sets of locking blocks 403 engage with the two crossbars 602 one by one. Multiple sets of locking rods 603 are vertically mounted at the bottom of the inner cavity of the groove, and multiple sets of through holes are opened on the rectangular handwheel 5. The locking rods 603 can be movably engaged with the through holes to ensure the stability of the transmission.

[0032] control system The control system includes a programmable logic controller and a drive circuit. The programmable logic controller controls the forward and reverse rotation and start and stop actions of the third motor 405 according to the preset torque threshold and the number of cycles, so as to realize the automated testing process.

[0033] Liquid tank 8 and flushing mechanism Liquid tank 8 stores different liquid media, such as water, acid solutions (e.g., sulfuric acid solution), alkaline solutions (e.g., sodium hydroxide solution), oils (e.g., hydraulic oil), and suspensions containing particles, to simulate the use of diaphragm valves in different media environments. Each liquid tank 8 includes a media storage tank and a pressure regulating tank. The pressure regulating tank is equipped with a pressure sensor and an electric regulating valve to simulate fluid pressure under different operating conditions.

[0034] The flushing mechanism includes a three-way pipe, one end of which is connected to one of the docking cylinders 701, and the other two ends are connected to the water inlet pipe 901 and the air inflation pipe 903, respectively; the other docking cylinder 701 is connected to the drain pipe 902, and an air pump 904 is installed on the air inflation pipe 903. Before switching the liquid tank 8, the flushing mechanism can flush the inside of the diaphragm valve to remove residual media, ensure the accuracy of the test, and meet the requirements of the controlled variable method.

[0035] In this embodiment, during operation: The manual diaphragm valve to be tested is fixed on the positioning frame 204 of the first sliding frame 203, ensuring that the two connecting parts of the diaphragm valve face the inner walls of the two sets of side plates 3 respectively. At this time, the two sets of side plates 3 are in a separated state. Start the first motor 201, and drive the first sliding frame 203 to move along the strip base 2 through the lead screw 202, so that the two ends of the diaphragm valve are aligned with the target through hole.

[0036] When the two sets of side plates 3 are in a separated state, the first sliding frame 203 can move along the strip base 2 under the drive of the first motor 201 and the lead screw 202, moving the diaphragm valve fixed on the positioning frame 204 to a suitable position.

[0037] When the two ends of the diaphragm valve are aligned with a certain pair of through holes, the second motor 301 drives the first rotating rod 302 to rotate, so that the two sets of side plates 3 are clamped together, and the diaphragm valve can then connect with the corresponding liquid tank 8.

[0038] The second motor 301 is started, which drives the two sets of side plates 3 to move closer together and clamp together via the first rotating rod 302, so that the two ends of the diaphragm valve are sealed and connected to the corresponding through holes, thereby forming a circulation loop with the liquid tank 8 connected to the through hole. If it is necessary to switch the test medium, simply control the two sets of side plates 3 to separate, move the first sliding frame 203 to the position of the corresponding through hole, and then clamp the side plates 3.

[0039] The second sliding frame 401 on the top frame 4 slides above the diaphragm valve, and the height of the lifting frame 404 is adjusted by the first telescopic rod 402, so that the transmission mechanism is connected to the operating handle of the diaphragm valve.

[0040] The second sliding frame 401 is slidable to position the testing mechanism above the diaphragm valve operating handle. The height of the lifting frame 404 is adjusted via the first telescopic rod 402 to connect the transmission mechanism to the diaphragm valve operating handle. The third motor 405 is started, driving the handle to rotate via a reducer and transmission mechanism, thus achieving repeated opening and closing of the valve. A torque sensor monitors the driving torque value in real time and feeds the data back to the control system. The control system controls the forward and reverse rotation and start / stop actions of the third motor 405 according to the preset torque threshold and number of cycles to complete the life test.

[0041] The control system, based on preset parameters, controls the third motor 405 to drive the diaphragm valve's operating handle via a transmission mechanism, thus repeatedly opening and closing the valve. A torque sensor detects and measures the applied torque on the handle. The control system receives and processes the data from the torque sensor and controls the motor accordingly to achieve torque control. When the torque reaches the set value, the torque sensor sends a feedback signal to the control system, which then stops the motor. The motor then reverses direction, and stops again when the torque reaches the set value, repeating this operation. The torque sensor monitors the drive torque value in real time and feeds the data back to the control system. When the torque value exceeds a preset threshold or reaches a preset number of cycles, the control system stops the motor.

[0042] When it is necessary to switch the liquid tank 8, first separate the two sets of side plates 3, move the first sliding frame 203 so that the diaphragm valve is aligned with the through hole corresponding to the flushing mechanism, after the side plates 3 are clamped, the flushing mechanism flushes the inside of the diaphragm valve, after the flushing is completed, move the first sliding frame 203 again so that the diaphragm valve is aligned with the through hole corresponding to the new liquid tank 8, and perform the next set of tests.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A manual diaphragm valve life testing device, characterized in that, It includes a base (1), a top frame (4) and multiple liquid tanks (8). A strip base (2) is fixedly installed on the base (1), and two sets of side plates (3) are slidably installed on it. The two sets of side plates (3) are located on both sides of the strip base (2) respectively, and can achieve relatively close movement. The strip base (2) is slidably connected to a first sliding frame (203), the sliding direction of which is perpendicular to the sliding direction of the side plate (3). The first sliding frame (203) is equipped with a positioning frame (204), which is used to fix the diaphragm valve and make the two connecting parts of the diaphragm valve face the inner walls of the two sets of side plates (3) respectively. Multiple sets of left and right opposite through holes are opened horizontally in the same direction on the two sets of side plates (3). One pair of through holes is connected to a flushing mechanism for flushing the residual medium inside the diaphragm valve. The remaining pairs of through holes are connected to a liquid tank (8) through a conduit (801) to form a circulation loop. When the two sets of side plates (3) are in a separated state, the first sliding frame (203) can move along the strip base (2); when the two ends of the diaphragm valve are aligned with a certain pair of through holes, the two sets of side plates (3) are clamped together, and the diaphragm valve can be connected to the corresponding liquid tank (8); The top frame (4) is located above the strip base (2), and a second sliding frame (401) is slidably connected to its bottom. The sliding direction of the second sliding frame (401) is parallel to the sliding direction of the first sliding frame (203). A testing mechanism is installed on the second sliding frame (401) for repeatedly opening and closing the valve of the diaphragm valve.

2. The manual diaphragm valve life testing device according to claim 1, characterized in that, The bottom of the second sliding frame (401) is connected to the lifting frame (404) via the first telescopic rod (402). The bottom of the lifting frame (404) is equipped with a third motor (405), a reducer, a torque sensor and a control system. The third motor (405) is connected to the transmission mechanism via a reducer. The transmission mechanism is connected to the operating handle of the diaphragm valve and is used to drive the handle to rotate in order to open and close the valve. The torque sensor is located at the connection between the transmission mechanism and the operating handle and is used to monitor the driving torque value in real time and feed the data back to the control system.

3. The manual diaphragm valve life testing device according to claim 2, characterized in that, The control system includes a programmable logic controller and a drive circuit. The programmable logic controller controls the forward and reverse rotation and start and stop actions of the third motor (405) according to a preset torque threshold and number of cycles.

4. The manual diaphragm valve life testing device according to claim 3, characterized in that, The transmission mechanism includes a crossbeam (406), the middle of which is horizontally connected to the transmission end of the third motor (405). The crossbeam (406) is provided with a spacing adjustment mechanism and two sets of locking blocks (403). The spacing adjustment mechanism is used to adjust the spacing between the two sets of locking blocks (403). The bottom of the two sets of locking blocks (403) is provided with a locking groove.

5. The manual diaphragm valve life testing device according to claim 4, characterized in that, It also includes a sleeve (6), a rectangular handwheel (5) is installed on the control shaft of the diaphragm valve, the bottom of the sleeve (6) is provided with a rectangular groove that matches the handwheel, a top rod (601) is installed on the top of the sleeve (6), the top two ends of the top rod (601) are respectively connected to horizontal crossbars (602), the slots of two sets of locking blocks (403) are engaged with the two crossbars (602) one by one, multiple sets of locking rods (603) are vertically installed at the bottom of the inner cavity of the groove, multiple sets of through holes are opened on the rectangular handwheel (5), and the locking rods (603) are movably engaged with the through holes.

6. The manual diaphragm valve life testing device according to claim 1, characterized in that, Each through hole on the outer side wall of the two sets of side plates (3) is vertically connected to a slide rail (703). The two sets of slide rails (703) are vertically connected to the slide plate (7). The outer side wall of the side plate (3) is also equipped with a second telescopic rod (702) for driving the slide plate (7) to slide vertically. The outer side wall of the slide plate (7) is equipped with a docking cylinder (701). A pair of docking cylinders (701) are connected to the liquid tank (8) through a conduit (801) and have two working states: when sliding upward, the docking cylinder (701) docks with the through hole; when sliding downward, the docking cylinder (701) is sealed by the side plate (3).

7. The manual diaphragm valve life testing device according to claim 6, characterized in that, The docking cylinder (701) is inclined downward from the end near the side plate (3) to the end away from the side plate (3).

8. The manual diaphragm valve life testing device according to claim 1, characterized in that, The flushing mechanism includes a three-way pipe, one end of which is connected to one of the docking cylinders (701), and the other two ends are connected to the water inlet pipe (901) and the air inlet pipe (903) respectively; the other docking cylinder (701) is connected to the drain pipe (902), and an air pump (904) is installed on the air inlet pipe (903).

9. The manual diaphragm valve life testing device according to claim 1, characterized in that, Each set of liquid tanks (8) stores different media. Each liquid tank (8) includes a media storage tank and a pressure regulating tank. The pressure regulating tank is equipped with a pressure sensor and an electric regulating valve to simulate fluid pressure under different working conditions.

10. A manual diaphragm valve life testing device according to claim 4, characterized in that, The strip base (2) is equipped with a first motor (201) and a lead screw (202). The first motor (201) drives the lead screw (202) to rotate. The bottom of the first sliding frame (203) is provided with a threaded hole that matches the lead screw (202). The lead screw (202) passes through the threaded hole to form a lead screw and nut transmission structure, so as to realize the automatic sliding of the first sliding frame (203) along the strip base (2). The base (1) is equipped with a second motor (301) and multiple sets of limiting rods (303). The multiple sets of limiting rods (303) are slidably connected to two sets of side plates (3) and play a guiding role for the two sets of side plates (3). The output end of the second motor (301) is connected to a first rotating rod (302). The two ends of the first rotating rod (302) are provided with threads facing opposite directions. The bottom of the two sets of side plates (3) are provided with threaded holes that are compatible with the two sets of threads of the corresponding first rotating rod (302) to realize the relative approach or separation of the two sets of side plates (3). Both sets of locking blocks (403) are slidably connected to the bottom of the crossbeam (406). The spacing adjustment mechanism includes a fourth motor (407) and a second rotating rod (408). The two ends of the second rotating rod (408) are provided with threads facing opposite directions. Both sets of locking blocks (403) are provided with threaded holes that are adapted to the two sets of threads of the corresponding second rotating rod (408), so as to realize the relative approach or separation of the two sets of locking blocks (403).

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