A hand operated diaphragm valve endurance air tightness testing machine

Abstract

The utility model relates to manual diaphragm valve technical field discloses a kind of manual diaphragm valve fatigue-resistant air-tight testing machine, comprising: the equipment main body includes equipment shell, the equipment shell is divided into upper body and lower body, the upper body is used to assemble equipment component, and air gap is equipped between the lower body and the upper body;Lifting rotating assembly is fixedly installed on the upper body, the moving base plate component is used to fix product, and the lifting rotating assembly is used to carry out positive and negative rotation actuation air-tight test to the moving base plate component;By setting split equipment shell and sliding type moving base plate component, cooperate array type limit sliding press hole shaft structure, the self-adapting adjustment of product fixation is realized, both solve the quick positioning problem of different specifications products, also avoid the damage in product fixing process by elastic pressing design, greatly improve the adaptability and fixed security of equipment to diversification product.

Description

Technical Field

[0001] This utility model belongs to the field of manual diaphragm valve technology, and more specifically, it relates to a fatigue airtightness testing machine for manual diaphragm valves. Background Technology

[0002] In industrial production, especially in the manufacturing of products such as valves and pipe fittings that require repeated operation and sealing performance testing, forward and reverse rotation testing and airtightness testing are core aspects of ensuring product quality. However, existing testing technologies and equipment have many shortcomings that urgently need to be addressed: Traditional testing methods often employ a discrete approach, involving separate equipment and workstations. This means the product must first undergo forward and reverse fatigue testing on dedicated actuation testing equipment before being manually transferred to airtightness testing equipment for sealing performance testing. This separate process not only increases the time cost of product transfer and repositioning, leading to low testing efficiency and difficulty in meeting the needs of mass production, but more importantly, manual transfer can easily result in product position shifts and changes in fixed states. This leads to inconsistencies in the product's posture between the two tests, directly affecting the correlation and accuracy of the test data and failing to truly reflect the product's sealing performance under actual operating conditions.

[0003] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a manual diaphragm valve fatigue airtightness testing machine. Utility Model Content

[0004] This invention provides a manual diaphragm valve fatigue airtightness testing machine to overcome the above-mentioned defects in the prior art.

[0005] The purpose and effectiveness of this utility model, a manual diaphragm valve fatigue tightness testing machine, are achieved through the following specific technical means: A manual diaphragm valve fatigue air tightness testing machine includes: a main body of equipment, the main body of equipment includes a housing, the housing is divided into an upper body and a lower body, the upper body is used to assemble equipment components, a gap is provided between the lower body and the upper body, and a movable base plate assembly is slidably provided in the gap. A lifting and rotating assembly is fixedly installed on the upper body. The movable base plate assembly is used to fix the product. The lifting and rotating assembly is used to perform forward and reverse rotation airtightness tests on the movable base plate assembly. The movable base plate assembly is threadedly fixed with a multi-functional contact head assembly, which is used to fix the product in an abutment manner.

[0006] A further technical solution is that a lifting and rotating assembly is fixedly installed at the bottom of the upper body. The lifting and rotating assembly includes a rotating mechanism. The output end of the rotating mechanism is fixedly connected to a mold frame head. An operation panel and operation buttons are provided on the front side of the upper body.

[0007] A further technical solution involves fixing a lifting slide rail to the wall of the gap, and sliding a movable base plate assembly on the lifting slide rail. The movable base plate assembly includes a side support plate, which slides on the lifting slide rail.

[0008] A further technical solution involves threaded mounting of an array of pressing multi-hole fixing plates on the side support plate, with fixing bolts fixedly installed on the outer side of the array of pressing multi-hole fixing plates to fix the height of the array of pressing multi-hole fixing plates.

[0009] A further technical solution is that the array pressing multi-hole fixing plate includes a fixed base plate, the surface of which is provided with a plurality of sliding holes, a pressing hole shaft is slidably inserted in the sliding holes, a limiting structure is provided between the sliding holes and the pressing hole shaft to limit the sliding stroke of the pressing hole shaft, and the upper end face of the pressing hole shaft is provided with a threaded hole along its axial direction, the threaded hole being used for threaded connection with the multi-functional contact head assembly.

[0010] A further technical solution involves connecting a multi-functional contact head assembly inside the threaded hole. The multi-functional contact head assembly includes a multi-textured spherical contact, a spherical rubber contact, and a diamond-shaped support abutment. The multi-textured spherical contact, the spherical rubber contact, and the diamond-shaped support abutment can be installed in different parts according to the different sizes of the product.

[0011] A further technical solution is that the multi-textured spherical contact component includes a first threaded fixing joint and an annular array plate. The first threaded fixing joint (311) is used to connect with the threaded hole of the pressing hole shaft (233). The annular array plate is made of steel plate annular array welded together.

[0012] A further technical solution is provided, in which the spherical rubber contact includes a rubber head and a second threaded fixing joint. The rubber head is fixedly connected to the upper end of the second threaded fixing joint and is fixedly connected to the pressing hole shaft. The rubber head is made of rubber and has several sets of protrusions on its outer side.

[0013] A further technical solution includes a diamond-shaped support contact member comprising a third threaded fixing joint, which is threadedly connected to the pressing hole shaft, and a diamond-shaped abutment is fixedly provided above the third threaded fixing joint.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This utility model discloses a manual diaphragm valve fatigue airtightness testing machine. By setting up a split equipment housing and a sliding moving base plate assembly, and in conjunction with an array-type limiting sliding pressing hole shaft structure, it achieves adaptive adjustment for product fixation. This not only solves the problem of rapid positioning of products of different specifications, but also avoids damage during the product fixation process through the elastic pressing design, greatly improving the equipment's adaptability to diverse products and the safety of fixation.

[0015] This utility model discloses a manual diaphragm valve fatigue tightness testing machine. It features a multi-functional contact head assembly detachably connected to the pressing hole shaft, consisting of a multi-textured spherical contact component, a spherical rubber contact component, and a diamond-shaped support contact component. This assembly achieves precise adaptation and fixation for products made of different materials (metal / plastic). The steel ring array structure enhances the wear resistance and stability of fixing metal products, while the rubber elastic structure and diamond multi-point support structure protect plastic products from compression deformation, significantly improving the targeting and reliability of the fixing effect.

[0016] This utility model discloses a manual diaphragm valve fatigue airtightness testing machine that integrates a lifting and rotating component with an airtightness testing function. Combined with preset parameter automatic control logic, it realizes the linkage operation of forward and reverse rotation testing and airtightness testing, eliminating the need for manual switching of workstations and operating procedures. This reduces the complexity of the testing process and ensures the accuracy of test results through immediate airtightness detection after operation. At the same time, it automatically accumulates the number of operations to determine the product lifespan, greatly improving testing efficiency and data integrity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall appearance and structure of this utility model.

[0018] Figure 2 This is a front view structural diagram of the entire utility model.

[0019] Figure 3 This is a side view of the structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the external structure of the array pressing multi-hole fixing plate in this utility model.

[0021] Figure 5 This is a schematic diagram of the external structure of the multifunctional contact head assembly in this utility model.

[0022] Figure 6 This is a front view structural diagram of the multi-textured spherical contact component in this utility model.

[0023] Figure 7 This is a front view structural diagram of the spherical rubber contact component in this utility model.

[0024] Figure 8 This is a front view structural diagram of the rhomboid support contact member in this utility model.

[0025] Explanation of reference numerals in the attached figures: 1. Main body of the equipment; 11. Equipment casing; 12. Control panel; 13. Lifting slide rail; 14. Operation buttons; 2. Movable base plate assembly; 21. Side support plate; 22. Fixing bolts; 23. Array pressing multi-hole fixing plate; 231. Fixing base plate; 232. Sliding hole; 233. Pressing hole shaft; 3. Multifunctional contact head assembly; 31. Multi-textured spherical contact; 311. First threaded fixing joint; 312. Annular array plate; 32. Spherical rubber contact; 321. Rubber head; 322. Second threaded fixing joint; 33. Rhomboid support abutment; 331. Rhomboid abutment; 332. Third threaded fixing joint; 4. Lifting and rotating assembly; 41. Rotating mechanism; 42. Mold holder head. Detailed Implementation

[0026] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium.

[0029] Furthermore, a fixed connection refers to a connection where parts or components are fixed and there is no relative movement; a transmission connection refers to a connection method that transmits mechanical motion or torque to other working parts through a transmission component; a sliding connection refers to a connection method where two objects are in contact but not fixed, and can slide relative to each other; a rotational connection refers to a connection method where two objects are in contact but not fixed, and can rotate relative to each other. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] Example: As attached Figure 1 To be continued Figure 8 As shown: This invention provides a manual diaphragm valve fatigue airtightness testing machine.

[0031] See attached document Figure 1 To be continued Figure 8 The system includes: a main body 1, which includes a housing 11. The housing 11 is divided into an upper body and a lower body. The separate design of the upper and lower bodies allows for the layered installation and management of equipment components. This facilitates the integrated arrangement of core functional components in the upper body and provides independent space for the movable base plate assembly 2 through the gap between the lower and upper bodies, effectively avoiding component interference and improving the overall layout rationality of the equipment. The upper body is used to assemble equipment components. By centrally installing core functional components, it can reduce the interference of the external environment on key components and ensure the stability of equipment operation. There is a gap between the lower and upper bodies, and the movable base plate assembly 2 is slidably installed in the gap. The sliding design of the movable base plate assembly 2 makes the product loading, unloading, and fixing operations more convenient. The product position can be flexibly adjusted to adapt to subsequent testing needs, greatly improving operational convenience.

[0032] A lifting and rotating assembly 4 is fixedly installed on the upper body. As the core actuator of the equipment, the fixed installation of the lifting and rotating assembly 4 ensures the structural stability during operation and avoids the impact of vibration on the test accuracy. The moving base plate assembly 2 is used to fix the product. By accurately positioning and fixing the product, it can prevent the product from shifting or shaking during the test, and provide a reliable fixed foundation for forward and reverse operation and airtightness testing. The lifting and rotating assembly 4 is used to perform forward and reverse operation airtightness testing on the product on the moving base plate assembly 2. The operation test and airtightness test are integrated into the same component, without the need for additional equipment or workstation switching, which significantly improves the test efficiency. At the same time, the linkage design of forward and reverse operation and airtightness testing can more realistically simulate the actual use scenario of the product, ensuring the accuracy and comprehensiveness of the test results.

[0033] The movable base plate assembly 2 is threadedly fixed with a multi-functional contact head assembly 3. The threaded fixing method has the advantages of firm connection and convenient disassembly and assembly, which makes it easy to quickly replace the contact head assembly according to different product needs, reducing equipment adjustment costs. The multi-functional contact head assembly 3 is used to fix the product by contact. Through the contact fixing structure, a tight fixation can be achieved without damaging the product shell. At the same time, it is compatible with products of different shapes and materials, greatly improving the versatility and adaptability of the equipment.

[0034] Preferably, referring to Figures 1 to 3, a lifting and rotating assembly 4 is fixedly installed at the bottom of the upper body. The bottom installation method allows the force of the lifting and rotating assembly 4 to act directly on the product, ensuring accurate force transmission during operation and avoiding force loss. The lifting and rotating assembly 4 includes a rotating mechanism 41, and a mold holder head 42 is fixedly connected to the output end of the rotating mechanism 41. The rotating mechanism 41 provides stable power for forward and reverse rotation. The mold holder head 42 can be adapted to mold clamps of different specifications, enhancing the equipment's adaptability to different products. An operation panel 12 and operation buttons 14 are provided on the front side of the upper body. The front-mounted design of the operation panel and operation buttons conforms to ergonomics, making it easy for operators to intuitively view parameters and quickly perform operations, reducing the difficulty of operation and improving work efficiency.

[0035] Preferably, referring to Figures 1 to 3, a lifting slide rail 13 is fixedly installed on the wall of the gap. The lifting slide rail 13 provides a stable sliding guide for the movable base plate assembly 2, ensuring smooth and uninterrupted movement. The movable base plate assembly 2 is slidably mounted on the lifting slide rail 13. The movable base plate assembly 2 includes a side support plate 21, which slides on the lifting slide rail 13. The side support plate 21 has good structural strength and can stably support the weight of the product and related components. At the same time, the sliding design makes the position adjustment of the movable base plate assembly 2 more flexible, facilitating the loading and unloading of products and the calibration of test positions.

[0036] Preferably, referring to Figure 3, the side support plate 21 is threadedly fixed with an array pressing multi-hole fixing plate 23. The threaded fixing method facilitates the disassembly, assembly, and height adjustment of the array pressing multi-hole fixing plate 23. The outer side of the array pressing multi-hole fixing plate 23 is fixedly installed with fixing bolts 22. The fixing bolts 22 are used to fix the height of the array pressing multi-hole fixing plate 23. The height position of the array pressing multi-hole fixing plate 23 can be accurately locked by the fixing bolts 22, avoiding height deviation caused by vibration during the test, and ensuring the consistency of product fixation and test accuracy.

[0037] Preferably, referring to Figure 4, the array pressing multi-hole fixing plate 23 includes a fixing base plate 231. The fixing base plate 231 provides a stable mounting foundation for the pressing hole shaft 233. The surface of the fixing base plate 231 is provided with multiple sets of sliding holes 232. The array-distributed sliding holes 232 can flexibly arrange the pressing hole shaft 233 according to the product shape and size, improving the adaptability of the equipment to different products. The pressing hole shaft 233 is inserted and limited to slide within each of the multiple sets of sliding holes 232. The limited sliding design of the pressing hole shaft 233 can realize the elastic pressing and fixing of the product, which can not only ensure the fixing effect, but also avoid excessive squeezing and damage to the product. The upper end of the pressing hole shaft 233 is provided with a threaded hole. The threaded hole provides a structural basis for the detachable connection of the multi-functional contact head assembly 3, which facilitates the replacement of different types of contact heads according to product characteristics.

[0038] Preferably, referring to Figure 5, a multi-functional contact head assembly 3 is connected inside the threaded hole. The threaded connection ensures that the contact head assembly is firmly installed and facilitates quick disassembly and replacement. The multi-functional contact head assembly 3 includes a multi-textured spherical contact 31, a spherical rubber contact 32, and a diamond-shaped support contact 33. The various types of contact head assemblies can meet the fixing needs of products of different materials and shapes, greatly improving the versatility of the equipment. The multi-textured spherical contact 31, the spherical rubber contact 32, and the diamond-shaped support contact 33 can be installed in different parts according to the different sizes of the products. Through targeted installation and arrangement, the product can be fixed in all directions and at multiple points, further improving the fixing stability and preventing the product from loosening during the test.

[0039] Preferably, referring to Figure 6, the multi-textured spherical contact 31 includes a first threaded fixing joint 311 and an annular array plate 312. The first threaded fixing joint 311 is threadedly connected to the diamond-shaped support contact 33. The threaded connection ensures that the two are tightly connected, which is convenient for combined use or individual disassembly. The annular array plate 312 is made of steel plate annular array welded together. The steel plate material has high strength and wear resistance. The annular array structure can increase the contact area with the product, improve the fixing stability, and effectively disperse pressure to avoid excessive local stress that could damage the product. It is especially suitable for fixing metal products.

[0040] Preferably, referring to Figure 7, the spherical rubber contact 32 includes a rubber head 321 and a second threaded fixing joint 322. The rubber head 321 is fixedly connected to the upper end of the second threaded fixing joint 322. The second threaded fixing joint 322 is fixedly connected to the pressing hole shaft 233. The threaded connection ensures a firm installation and facilitates replacement. The rubber head 321 is made of rubber, which has good elasticity and cushioning properties, and can avoid scratches or damage to the product shell caused by hard contact. Several sets of protrusions are provided on the outer side of the rubber head 321. The protrusion design can increase the friction between the rubber head and the product surface, further improve the fixing effect, and prevent the product from sliding during the test.

[0041] Preferably, referring to Figure 8, the rhomboid support contact member 33 includes a third threaded fixing joint 332, which is threadedly connected to the pressing hole shaft 233. The threaded connection structure is simple and reliable, and facilitates quick installation and disassembly. A rhomboid abutment 331 is fixedly provided above the third threaded fixing joint 332. The rhomboid abutment can form multi-point support, enhancing the abutment and fixing effect on the product. At the same time, the rhomboid structure's angular design can adapt to the concave or corner positions on the product surface, improving the fit of the fixation. It is especially suitable for fixing plastic products, ensuring a firm fixation while avoiding excessive compression that could cause product deformation.

[0042] Specific usage method of this utility model: When using this invention, first place it on a flat workstation in the workshop to ensure that the equipment shell 11 of the main body 1 is stably supported. The separate layout of the upper and lower bodies can avoid interference from the external environment to the internal core components and ensure the stability of the subsequent testing process. Then, connect the power to the device and complete the initial power-on test through the operation panel 12 and operation button 14 on the front of the upper body to ensure that the circuit connection of core components such as the lifting and rotating assembly 4 and the moving base plate assembly 2 is normal, laying a reliable foundation for the testing process.

[0043] Next, the workpiece is precisely placed directly below the lifting and rotating assembly 4. Utilizing the sliding function of the movable base plate assembly 2 on the lifting slide rail 13, the workpiece position can be flexibly adjusted to ensure the workpiece center remains coaxial with the mold holder head 42 of the lifting and rotating assembly 4, improving the accuracy of subsequent operation tests. The pressing hole shafts 233 below the lifting and rotating assembly 4 are marked with different colors, allowing for quick positioning of the core fixing area, facilitating precise workpiece placement by operators and reducing positioning errors. After the workpiece is placed in the marked area, the product is pressed downwards. The pressing hole shafts 233 on the array pressing multi-hole fixing plate 23, through their limiting sliding characteristics, form an adaptive wrapping fixation of the product, ensuring uniform fixing force while avoiding excessive squeezing and damage. Simultaneously, the height of the array pressing multi-hole fixing plate 23, locked by the fixing bolts 22, ensures consistency in each fixing operation.

[0044] Subsequently, a suitable multi-functional contact head assembly 3 is selected and installed according to the product characteristics: If the product shell is made of plastic, a diamond-shaped support contact 33 is selected. The multi-point support structure of its diamond-shaped contact 331 can ensure a firm fixation while dispersing contact pressure, preventing the plastic shell from deforming due to excessive local stress. Eight diamond-shaped support contact 33s are reasonably arranged on the outside of the product to form an all-round fixation, further improving the stability of the product during operation. If the product shell is made of metal, a multi-textured spherical contact 31 is used. The steel plate structure of its annular array plate 312 has excellent wear resistance. The annular array design increases the contact area with the metal surface, which can not only enhance the fixation stability, but also cope with the hardness characteristics of the metal material, avoiding slippage or wear during the fixation process. The spherical rubber contact 32 can be flexibly added or removed according to the product's fixation requirements. The elastic material and convex design of its rubber head 321 can not only increase friction and improve the fixation effect, but also protect the product surface through buffering, adapting to different fixation strength requirements.

[0045] After the product is fixed, the external air supply pipe is securely connected to the product's air intake port. At the same time, a matching mold clamp is selected according to the product specifications and fixed on the mold holder 42. The fixed connection structure between the mold holder 42 and the rotating mechanism 41 ensures accurate power transmission during subsequent forward and reverse operation and avoids torque loss.

[0046] Then press the panel power button to power on and manually debug parameters: operate the operation panel 12 to capture the torque and rotational speed at which the product can smoothly perform forward and reverse rotation actions. The accurate setting of these parameters can adapt to the structural strength of different products and avoid product damage caused by improper torque or rotational speed. Input the captured parameters into the equipment control system, and simultaneously input the target value of rotation times and the target pressure value of the air tightness test, then click "on" to start the automatic operation program. After the equipment is started, the rotating mechanism 41 of the lifting and rotating assembly 4 drives the mold frame head 42 and the product to perform forward and reverse rotation action tests. One forward rotation plus one reverse rotation constitutes one complete action. The split-type equipment housing 11 provides stable structural support during the action process, preventing component interference from affecting the action accuracy.

[0047] When the product reaches the preset number of rotations, the equipment emits a prompt tone and automatically switches to the air tightness test stage. This linked design does not require manual station switching, greatly improving test efficiency. The equipment automatically injects air into the product through an external air supply pipeline. After the inflation reaches the target pressure value, pressure is maintained for the preset pressure holding time. During this process, the fixed state of the product is kept stable through the synergistic effect of the multi-functional contact assembly 3 and the pressing hole shaft 233, preventing product displacement caused by pressure changes and ensuring accurate air tightness test results. After the preset pressure holding time ends, the equipment automatically records the actual pressure value. If there is no pressure drop, it indicates that the sealing performance and structural strength of the product meet the requirements, and the product is determined to be qualified.

[0048] To further verify the service life of the product, the number of forward and reverse rotation actions can be further set via the operation panel 12, and the above linked process of forward and reverse rotation action test and air tightness test is repeated until a pressure drop occurs in the product during the air tightness test. At this time, the equipment automatically accumulates the sum of all action times, and this value is the service life of the target valve. Throughout the entire test process, the integrated design of the equipment integrates the action test and the air tightness test. The flexible adaptability of the multi-functional contact assembly 3 and the stable fixing performance of the moving baseplate assembly 2 ensure the reliability and comprehensiveness of the test results, while simplifying the operation process and improving test efficiency. The embodiments of the present utility model are presented for the purpose of illustration and description, and are not intended to be exhaustive or to limit the utility model to the precise forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better explain the principles and practical applications of the present utility model, and to enable those of ordinary skill in the art to understand the present utility model so as to design various embodiments with various modifications suitable for specific uses.

Claims

1. A manual diaphragm valve fatigue tightness testing machine, comprising a main body (1), the main body (1) comprising a housing (11), the housing (11) being divided into an upper body and a lower body, the upper body being used for assembling equipment components, and a gap being provided between the lower body and the upper body, characterized in that: A movable base plate assembly (2) is slidably provided within the gap; The upper body is fixedly installed with a lifting and rotating assembly (4), the movable base plate assembly (2) is used to fix the product, and the lifting and rotating assembly (4) is used to perform forward and reverse rotation and airtightness test on the product on the movable base plate assembly (2). The movable base plate assembly (2) is threadedly fixed with a multifunctional contact head assembly (3), which is used for contact fixing of the product.

2. The manual diaphragm valve fatigue airtightness testing machine according to claim 1, characterized in that: The upper body is fixedly installed with a lifting and rotating assembly (4) at the bottom. The lifting and rotating assembly (4) includes a rotating mechanism (41). The output end of the rotating mechanism (41) is fixedly connected to a mold frame head (42). The upper body is provided with an operation panel (12) and operation buttons (14) on the front side.

3. The manual diaphragm valve fatigue airtightness testing machine according to claim 1, characterized in that: A lifting slide rail (13) is fixedly installed on the wall of the gap. A movable base plate assembly (2) is slidably provided on the lifting slide rail (13). The movable base plate assembly (2) includes a side support plate (21), which slides along the lifting slide rail (13).

4. A manual diaphragm valve fatigue tightness testing machine according to claim 3, characterized in that: The side support plate (21) is threaded with an array pressing multi-hole fixing plate (23). The array pressing multi-hole fixing plate (23) is provided with fixing bolts (22) on the outside. The fixing bolts (22) are used to fix the height of the array pressing multi-hole fixing plate (23).

5. A manual diaphragm valve fatigue airtightness testing machine according to claim 4, characterized in that: The array of pressable multi-hole fixing plate (23) includes a fixing base plate (231). The surface of the fixing base plate (231) is provided with an array of sliding holes (232). A pressing hole shaft (233) is slidably inserted in the sliding hole (232). A limiting structure is provided between the sliding hole (232) and the pressing hole shaft (233) to limit the sliding stroke of the pressing hole shaft (233). The upper end face of the pressing hole shaft (233) is provided with a threaded hole along its axial direction. The threaded hole is used for threaded connection with the multi-functional contact head assembly (3).

6. A manual diaphragm valve fatigue tightness testing machine according to claim 5, characterized in that: The threaded hole is connected to a multi-functional contact head assembly (3), which includes a multi-textured spherical contact (31), a spherical rubber contact (32), and a diamond-shaped support contact (33). The multi-textured spherical contact (31), the spherical rubber contact (32), and the diamond-shaped support contact (33) can be installed in different parts according to the product specifications.

7. A manual diaphragm valve fatigue tightness testing machine according to claim 6, characterized in that: The multi-textured spherical contact (31) includes a first threaded fixing joint (311) and an annular array plate (312). The first threaded fixing joint (311) is used to be threadedly connected to the threaded hole of the pressing hole shaft (233). The annular array plate (312) is formed by welding annular array of steel plates.

8. A manual diaphragm valve fatigue tightness testing machine according to claim 6, characterized in that: The spherical rubber contact (32) includes a rubber head (321) and a second threaded fixing joint (322). The upper end of the second threaded fixing joint (322) is fixedly connected to the rubber head (321). The second threaded fixing joint (322) is fixedly connected to the pressing hole shaft (233). The rubber head (321) has several protrusions on its outer side.

9. A manual diaphragm valve fatigue tightness testing machine according to claim 6, characterized in that: The rhomboid support contact member (33) includes a third threaded fixing joint (332), which is threadedly connected to the pressing hole shaft (233), and a rhomboid abutment (331) is fixedly provided above the third threaded fixing joint (332).

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