A calibration bench for multi-diameter safety valves

Abstract

The present invention discloses a calibration bench for multi-diameter safety valves. The present invention relates to the technical field of calibration benches, and includes a fixing mechanism and a connecting fastener provided on the fixing mechanism; the fixing mechanism includes a support seat, an electric push rod is fixedly connected to the outer wall of the support seat, the output end of the electric push rod is fixedly connected to a connecting rod, a through hole is opened in the middle of the connecting rod, and a limiting rod is slidably connected to the inner wall of the through hole. For the calibration bench of the multi-diameter safety valve, the fixing block is driven by the limiting rod to move upward inside the through hole, so as to clamp the safety valves of different diameters on the limiting block, improving the applicability of the equipment. At the same time, through the fixing plate and the fixing block, the flange of the safety valve is clamped to prevent the safety valve from detaching from the equipment during calibration, resulting in inaccurate calibration results. The fixing mechanism clamps and fixes the safety valve in both the axial and radial directions, improving the fixing property of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of calibration platforms, and particularly to a calibration platform for multi-diameter safety valves. Background Art

[0002] A safety valve is an overpressure protection device widely used in pressure-bearing equipment such as boilers, pressure vessels, and pressure pipelines, especially pressure-bearing special equipment. To ensure the inherent safety of pressure-bearing special equipment, generally one or more safety valves are set at the highest pressure point of the pressure-bearing components. Therefore, the safety valve has become an important safety accessory to ensure the safe operation of special equipment. During the use of the safety valve, its discharge pressure will change due to the influence of the medium, operating conditions, etc. Therefore, the safety technical specifications for special equipment and corresponding laws, regulations, standards, etc. have all put forward the regulations on the mandatory calibration of safety valves. For example, the safety valves on boilers, pressure vessels, or pressure pipelines should be calibrated annually.

[0003] The safety valve belongs to the category of automatic valves and is mainly used on boilers, pressure vessels, and pipelines to control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation. Therefore, the safety valve must undergo a pressure test before it can be used. In the past, the calibration platform had a high degree of specificity and could not be applied to safety valves of different sizes. When fixing safety valves that do not match, the stability is poor. When dealing with safety valves of different size types, multiple calibration devices need to be prepared, thus reducing the practicability and application range of the calibration equipment. Summary of the Invention

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A calibration platform for multi-diameter safety valves, comprising a platform, and a control component fixedly installed on the outer wall of the platform;

[0005] A fixing mechanism, and a connecting fastener arranged on the fixing mechanism;

[0006] A supporting mechanism, and a connecting member arranged on the supporting mechanism;

[0007] The supporting mechanism is fixedly connected to the bottom of the platform through a connecting member, and the fixing mechanism is fixedly connected to the top of the platform through a connecting fastener;

[0008] Among them, the fixing mechanism includes a support seat, the support seat is fixedly connected to the platform, an electric push rod is fixedly connected to the outer wall of the support seat, a connecting rod is fixedly connected to the output end of the electric push rod, a through hole is opened in the middle of the connecting rod, a limiting rod is slidably connected to the inner wall of the through hole, and the limiting rod is an E-shaped plate. During the working process, the safety valve is placed on the limiting block, the electric push rod works, so that the electric push rod pushes the connecting rod towards the safety valve. At the same time, the support rod on the limiting rod slides on the top of the limiting plate, and extrusion is generated between the support rod and the limiting plate, so that the limiting rod drives the fixing block to move upward inside the through hole, thereby clamping safety valves with different diameters on the limiting block, improving the applicability of the equipment. At the same time, through the fixing plate and the fixing block, the flange of the safety valve is clamped to prevent the safety valve from detaching from the equipment during calibration, resulting in inaccurate calibration results. The safety valve is clamped and fixed in both the axial and radial directions through the fixing mechanism, improving the fixing property of the equipment. The end of the limiting rod away from the electric push rod is fixedly connected to a fixing block, and the top of the fixing block is inclined to reduce the contact area in part, so that during clamping, the wear of the flange of the safety valve is reduced. The end of the limiting rod close to the fixing block is fixedly connected to a fixing plate, and an elastic plate is fixedly connected to the top of the fixing plate. The elastic plate has elasticity, and the end of the elastic plate away from the fixing plate is fixedly connected to the connecting rod. A support rod is fixedly connected to the outer wall of the limiting rod, and a limiting plate is fixedly connected to the top of the platform. The top of the limiting plate is provided with a groove in a tooth shape, and the top of the limiting plate is inclined. From the electric push rod to the fixing block, the inclination direction of the limiting plate is from low to high. During work, through the inclined setting of the top of the limiting plate, the fixing block can be at the same height as different steps, facilitating the clamping of safety valves with different diameters. The limiting plate is in contact with the support rod.

[0009] Preferably, a compression spring is fixedly connected to the bottom of the connecting rod. The compression spring has elasticity and plays a reset role. The end of the compression spring away from the connecting rod is fixedly connected to the limiting rod. A positioning plate is fixedly connected to the bottom of the limiting rod. A support plate is fixedly connected to the end of the connecting rod close to the compression spring. The support plate is in a stepped shape. During the working process, it can be slidably connected to the through groove on the limiting block, playing a guiding role, and at the same time forming a sealed space between the limiting block and the safety valve.

[0010] The limiting rod is located in the middle of the through hole, the fixing plate is located above the fixing block, the support plate is located at the bottom of the fixing block, and the support rod is located at the end of the limiting rod away from the fixing block.

[0011] Preferably, the platform includes a housing, the outer wall of the housing is provided with heat dissipation holes, the top of the housing is fixedly connected with a limiting block, and the limiting block is of a stepped type and can be used to place safety valves of different calibers. A round hole is provided in the middle of the limiting block, and threads are provided on the outer wall of each step of the limiting block. The threads on the outer wall of the limiting block can be threadedly connected with the inner wall of the safety valve pipeline. Through the mutual cooperation of the threads, the safety valve is limited, and at the same time, the axis deviation can be avoided during the calibration of the safety valve. Moreover, the safety valve and the limiting block are threadedly connected, so that the connection part has good sealing performance and avoids leakage affecting the calibration result. A chute is provided at the top of the housing, the connecting rod is located inside the chute, and the connecting rod is slidably connected with the chute. The chute penetrates through the housing and the limiting block.

[0012] Preferably, a base is fixedly connected to the inner wall of the housing, and a communicating pipe is fixedly connected to the top of the base. The communicating pipe has four pipe orifices, which consists of an intermediate pipe and three side pipes. The outer wall of the intermediate pipe communicates with the three side pipes, and the three pipes are evenly distributed around the intermediate pipe. During the working process, after the safety valve is fixed, the bottom of the connecting pipe is connected to a water pipe, so that water enters the communicating pipe. By setting pistons at the tops of the three outer pipes, the communicating pipe is filled with water. After the water filling is completed, the connecting pipe is blocked, and the hydraulic rod drives the piston to move downward in the side pipe. At this time, the water level in the intermediate pipe moves upward, and the inner cavity of the safety valve is under pressure, so as to detect the pressure of the safety valve. The middle part of the communicating pipe is communicated with the middle part of the limiting block. A connecting pipe is fixedly connected to the bottom of the communicating pipe, and the connecting pipe penetrates through the housing and is communicated with the communicating pipe.

[0013] Preferably, a hydraulic rod is fixedly connected to the inner wall of the housing, the output end of the hydraulic rod is fixedly connected with a piston, and the piston is located inside the communicating pipe. A support rod is fixedly connected to the outer wall of the hydraulic rod. During the working process, the hydraulic rod drives the piston to move downward, so that the water in the side pipe flows into the intermediate pipe, and then the water level in the intermediate pipe rises. At the same time, the inside of the safety valve is under pressure. As the piston moves, the pressure received by the safety valve gradually increases. By setting the support rod, during the downward movement of the support rod, it collides with the positioning plate and stops moving downward, so that the device can adjust the pressure according to the different pressure thresholds of safety valves of different calibers. The support rod is located above the positioning plate, and a support is fixedly connected to the inner wall of the housing, and the support is fixedly connected with the communicating pipe.

[0014] Preferably, the supporting mechanism includes a cylinder. A fixing ring is fixedly connected to the inner wall of the cylinder. A reset spring is fixedly connected to the top of the fixing ring. One end of the reset spring away from the fixing ring is fixedly connected to a supporting plate. The supporting plate is fixedly connected to the bottom of the housing. One end of the supporting plate close to the reset spring is fixedly connected to a round rod. When the safety valve is subjected to pressure calibration, the platform may vibrate during mechanical operation. By setting the reset spring, when the device vibrates, the supporting plate moves downward, and the reset spring is compressed under force. Utilizing the elastic performance of the reset spring, it plays a buffering role. The round rods are evenly distributed around the reset spring. A circular groove is formed in the outer wall of the cylinder. The round rods are located inside the circular groove. The round rods are slidably connected to the cylinder through the circular groove. A moving rod is slidably connected to the middle of the cylinder. The moving rod is an L-shaped plate. When the vibration amplitude is too large, the supporting plate drives the round rod to move downward. At this time, the round rod contacts the moving rod inside the circular groove and generates extrusion. Since the top of the moving rod close to the round rod is inclined, the moving rod is forced to move towards the direction of the cylinder, and then one end of the moving rod close to the supporting ring is clamped with the square groove, and the supporting plate cannot rebound. The device needs to be repaired to avoid inaccurate calibration data caused by too large vibration amplitude. A supporting ring is fixedly connected to the bottom of the fixing ring. One end of the supporting ring away from the fixing ring is fixedly connected to the inner wall of the cylinder. The moving rod penetrates through the supporting ring. A cylinder is fixedly connected to the bottom of the supporting plate. The cylinder penetrates through the reset spring. The cylinder is slidably connected to the inner wall of the fixing ring. A square groove is formed in the outer wall of the cylinder.

[0015] The present invention provides a calibration bench for multi-diameter safety valves, which has the following beneficial effects:

[0016] First, for the calibration bench for multi-diameter safety valves, by sliding the supporting rod on the top of the limiting plate, extrusion is generated between the supporting rod and the limiting plate, so that the limiting rod drives the fixing block to move upward inside the through hole, and then clamps safety valves with different diameters on the limiting block, improving the applicability of the device. At the same time, through the fixing plate and the fixing block, the flange of the safety valve is clamped to prevent the safety valve from detaching from the device during calibration, resulting in inaccurate calibration results. The safety valve is clamped and fixed in the axial and radial directions through the fixing mechanism, improving the fixing property of the device.

[0017] Second, for the calibration bench for multi-diameter safety valves, a toothed groove is provided on the top of the limiting plate, and the top of the limiting plate is inclined. From the electric push rod to the fixing block, the inclined direction of the limiting plate is from low to high. During operation, due to the inclined setting of the top of the limiting plate, the fixing block can be at the same height as different steps, facilitating the clamping of safety valves with different diameters.

[0018] III. The calibration bench for multi - caliber safety valves has a stepped structure formed by the limit blocks, which can be used to place safety valves of different calibers. A round hole is opened in the middle of the limit block, and threads are provided on the outer wall of each step of the limit block. The threads on the outer wall of the limit block can be thread - connected with the inner wall of the safety valve pipeline. Through the mutual cooperation of the threads, the safety valve is limited, and at the same time, the axial center of the safety valve can be prevented from shifting during calibration. Moreover, since the safety valve and the limit block are thread - connected, the connection part has good sealing performance, avoiding leakage and affecting the calibration result.

[0019] IV. For the calibration bench of multi - caliber safety valves, as the piston moves, the pressure on the safety valve gradually increases. By setting the support rod, during the downward movement of the support rod, it collides with the positioning plate and stops moving downward, enabling the device to adjust the pressure according to the different pressure thresholds of safety valves of different calibers.

[0020] V. For the calibration bench of multi - caliber safety valves, the top of the moving rod close to the round rod is set to be inclined, so that the moving rod is forced to move towards the direction of the cylinder, and then one end of the moving rod close to the support ring is clamped with the square groove, and the support plate cannot rebound. The device needs to be repaired to avoid inaccurate calibration data caused by excessive vibration amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the external structure schematic diagram of a calibration bench for a multi - caliber safety valve of the present invention;

[0022] Figure 2 is the schematic diagram of the bottom view structure of the present invention;

[0023] Figure 3 is the schematic diagram of the cross - sectional view structure of the present invention;

[0024] Figure 4 is the schematic diagram of the side - view structure of the fixing mechanism of the present invention;

[0025] Figure 5 is the schematic diagram of the partial side - view structure of the fixing mechanism of the present invention;

[0026] Figure 6 is the schematic diagram of the cross - sectional view structure of the platform of the present invention;

[0027] Figure 7 is the schematic diagram of the supporting mechanism of the present invention;

[0028] Figure 8 is the schematic diagram of the cross - sectional view structure of the supporting mechanism of the present invention.

[0029] In the figure: 1. Platform; 101. Housing; 102. Limiting block; 103. Hydraulic rod; 104. Connecting pipe; 105. Base; 106. Connecting tube; 107. Support; 108. Support rod; 109. Piston; 110. Chute; 2. Support mechanism; 21. Cylinder; 22. Fixed ring; 23. Return spring; 24. Support plate; 25. Round rod; 26. Round groove; 27. Moving rod; 28. Cylinder; 29. Square groove; 210. Support ring; 3. Fixing mechanism; 31. Support seat; 32. Electric push rod; 33. Connecting rod; 34. Through hole; 35. Fixed block; 36. Fixed plate; 37. Elastic plate; 38. Support rod; 39. Limiting plate; 310. Support plate; 311. Compression spring; 312. Limiting rod; 313. Positioning plate; 4. Control component. Detailed implementation mode

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0031] The first embodiment is as Figures 1 to 5 shown. The present invention provides a technical solution: a calibration platform for multi-diameter safety valves, including a platform 1 and a control component 4 fixedly installed on the outer wall of the platform 1;

[0032] a fixing mechanism 3 and a connecting fastener arranged on the fixing mechanism 3;

[0033] a support mechanism 2 and a connecting member arranged on the support mechanism 2;

[0034] The support mechanism 2 is fixedly connected to the bottom of the platform 1 through the connecting member, and the fixing mechanism 3 is fixedly connected to the top of the platform 1 through the connecting fastener;

[0035] Among them, the fixing mechanism 3 includes a support seat 31, the support seat 31 is fixedly connected to the platform 1, an electric push rod 32 is fixedly connected to the outer wall of the support seat 31, an output end of the electric push rod 32 is fixedly connected to a connecting rod 33, a through hole 34 is formed in the middle of the connecting rod 33, a limiting rod 312 is slidably connected to the inner wall of the through hole 34, the limiting rod 312 is an E-shaped plate. During the working process, the safety valve is placed on the limiting block 102, the electric push rod 32 works, so that the electric push rod 32 pushes the connecting rod 33 towards the safety valve. At the same time, a support rod 38 on the limiting rod 312 slides on the top of the limiting plate 39, and an extrusion is generated between the support rod 38 and the limiting plate 39, so that the limiting rod 312 drives the fixing block 35 to move upward inside the through hole 34, thereby clamping safety valves with different calibers on the limiting block 102, improving the applicability of the equipment. At the same time, through the fixing plate 36 and the fixing block 35, the flange of the safety valve is clamped to prevent the safety valve from detaching from the equipment during calibration, resulting in inaccurate calibration results. The fixing mechanism 3 clamps and fixes the safety valve in both the axial and radial directions, improving the fixity of the equipment. One end of the limiting rod 312 far from the electric push rod 32 is fixedly connected to a fixing block 35, the top of the fixing block 35 is inclined, reducing the partial contact area, so that during clamping, the wear on the flange of the safety valve is reduced. One end of the limiting rod 312 close to the fixing block 35 is fixedly connected to a fixing plate 36, a spring plate 37 is fixedly connected to the top of the fixing plate 36, the spring plate 37 has elasticity, and one end of the spring plate 37 far from the fixing plate 36 is fixedly connected to the connecting rod 33. A support rod 38 is fixedly connected to the outer wall of the limiting rod 312, a limiting plate 39 is fixedly connected to the top of the platform 1, a toothed groove is provided on the top of the limiting plate 39, and the top of the limiting plate 39 is inclined. From the electric push rod 32 to the fixing block 35, the inclination direction of the limiting plate 39 is from low to high. During work, through the inclined setting of the top of the limiting plate 39, the fixing block 35 can be at the same height as different steps, facilitating the clamping of safety valves with different calibers, and the limiting plate 39 is in contact with the support rod 38.

[0036] A compression spring 311 is fixedly connected to the bottom of the connecting rod 33. The compression spring 311 has elasticity and plays a reset role. One end of the compression spring 311 far from the connecting rod 33 is fixedly connected to the limiting rod 312. A positioning plate 313 is fixedly connected to the bottom of the limiting rod 312. A support plate 310 is fixedly connected to one end of the connecting rod 33 close to the compression spring 311. The support plate 310 is in a stepped shape. During the working process, it can be slidably connected to the through groove on the limiting block 102, playing a guiding role and at the same time forming a sealed space between the limiting block 102 and the safety valve.

[0037] The limiting rod 312 is located in the middle of the through hole 34, the fixing plate 36 is located above the fixing block 35, the support plate 310 is located at the bottom of the fixing block 35, and the support rod 38 is located at one end of the limiting rod 312 far from the fixing block 35.

[0038] Second Embodiment. On the basis of the first embodiment, please refer to Figure 6 As shown, the platform 1 includes a housing 101. The outer wall of the housing 101 is provided with heat dissipation holes. The top of the housing 101 is fixedly connected with a limiting block 102. The limiting block 102 is of a stepped type and can be used to place safety valves with different calibers. A round hole is opened in the middle of the limiting block 102, and threads are provided on the outer wall of each step of the limiting block 102. The threads on the outer wall of the limiting block 102 can be threadedly connected with the inner wall of the safety valve pipeline. Through the mutual cooperation of the threads, the safety valve is limited. At the same time, it can avoid the offset of the axis during the calibration of the safety valve. Moreover, the safety valve and the limiting block 102 are threadedly connected, so that the connection part has good sealing performance and avoids leakage from affecting the calibration result. A chute 110 is opened at the top of the housing 101. The connecting rod 33 is located inside the chute 110, and the connecting rod 33 is slidably connected with the chute 110. The chute 110 penetrates through the housing 101 and also penetrates through the limiting block 102.

[0039] The inner wall of the housing 101 is fixedly connected with a base 105. The top of the base 105 is fixedly connected with a communicating pipe 104. The communicating pipe 104 has four pipe orifices, which consists of one middle pipe and three side pipes. The outer wall of the middle pipe communicates with the three side pipes, and the three pipes are evenly distributed around the middle pipe. During the working process, after the safety valve is fixed, the bottom of the connecting pipe 106 is connected to a water pipe, so that water enters the inside of the communicating pipe 104. By arranging pistons at the tops of the three outer pipes, the communicating pipe 104 is filled with water. After the water filling is completed, the connecting pipe 106 is blocked, and the hydraulic rod 103 drives the piston 109 to move downward in the side pipe. At this time, the water level in the middle pipe moves upward, and the inner cavity of the safety valve is under pressure, so as to detect the pressure of the safety valve. The middle part of the communicating pipe 104 is communicated with the middle part of the limiting block 102. The bottom of the communicating pipe 104 is fixedly connected with a connecting pipe 106. The connecting pipe 106 penetrates through the housing 101, and the connecting pipe 106 is communicated with the communicating pipe 104.

[0040] The inner wall of the housing 101 is fixedly connected with a hydraulic rod 103. The output end of the hydraulic rod 103 is fixedly connected with a piston 109. The piston 109 is located inside the connecting pipe 104. The outer wall of the hydraulic rod 103 is fixedly connected with a support rod 108. During the working process, the hydraulic rod 103 drives the piston 109 to move downward, causing the water in the side pipe to flow into the middle pipe. As a result, the water level in the middle pipe rises. At the same time, the safety valve is under pressure. As the piston 109 moves, the pressure on the safety valve gradually increases. By setting the support rod 108, during the downward movement of the support rod 108, it collides with the positioning plate 313 and stops moving downward, enabling the device to adjust the pressure according to the different pressure thresholds of safety valves with different diameters. The support rod 108 is located above the positioning plate 313. The inner wall of the housing 101 is fixedly connected with a support 107, and the support 107 is fixedly connected with the connecting pipe 104.

[0041] The third embodiment is based on the first and second embodiments. Please refer to Figures 7 to 8 As shown, the support mechanism 2 includes a cylinder 21. The inner wall of the cylinder 21 is fixedly connected with a fixing ring 22. The top of the fixing ring 22 is fixedly connected with a return spring 23. The end of the return spring 23 away from the fixing ring 22 is fixedly connected with a support plate 24. The support plate 24 is fixedly connected with the bottom of the housing 101. One end of the support plate 24 close to the return spring 23 is fixedly connected with a round rod 25. When the safety valve is subjected to pressure calibration, the platform 1 may vibrate during mechanical operation. By setting the return spring 23, when the device vibrates, the support plate 24 moves downward and the return spring 23 is compressed under force. Utilizing the elastic performance of the return spring 23, it plays a buffering role. The round rods 25 are evenly distributed around the return spring 23. A circular groove 26 is formed on the outer wall of the cylinder 21. The round rods 25 are located inside the circular groove 26, and the round rods 25 are slidably connected to the cylinder 21 through the circular groove 26. A moving rod 27 is slidably connected to the middle of the cylinder 21. The moving rod 27 is an L-shaped plate. When the vibration amplitude is too large, the support plate 24 drives the round rod 25 to move downward. At this time, the round rod 25 contacts and squeezes the moving rod 27 inside the circular groove 26. Since the top of the moving rod 27 close to the round rod 25 is inclined, the moving rod 27 is forced to move towards the direction of the cylinder 28, and then the end of the moving rod 27 close to the support ring 210 is clamped with the square groove 29, and the support plate 24 cannot rebound. The device needs to be repaired to avoid inaccurate calibration data caused by too large vibration amplitude. The bottom of the fixing ring 22 is fixedly connected with a support ring 210. The end of the support ring 210 away from the fixing ring 22 is fixedly connected with the inner wall of the cylinder 21. The moving rod 27 passes through the support ring 210. The bottom of the support plate 24 is fixedly connected with a cylinder 28. The cylinder 28 passes through the return spring 23, and the cylinder 28 is slidably connected with the inner wall of the fixing ring 22. A square groove 29 is formed on the outer wall of the cylinder 28.

[0042] In use, place the safety valve on the limit block 102. The electric push rod 32 works, causing the electric push rod 32 to push the connecting rod 33 towards the safety valve. At the same time, the support rod 38 on the limit rod 312 slides on the top of the limit plate 39, and extrusion occurs between the support rod 38 and the limit plate 39, causing the limit rod 312 to drive the fixed block 35 to move upward inside the through hole 34, thereby clamping safety valves with different diameters on the limit block 102.

[0043] After fixing the safety valve, connect a water pipe to the bottom of the connecting pipe 106, allowing water to enter the inside of the communicating pipe 104. By setting pistons at the tops of the three outer pipes, the communicating pipe 104 is filled with water. After the water filling is completed, the connecting pipe 106 is blocked, and the hydraulic rod 103 drives the piston 109 to move downward in the side pipe. At this time, the water level in the middle pipe moves upward, and the inner cavity of the safety valve is under pressure, thereby detecting the pressure of the safety valve. After the calibration is completed, the hydraulic rod 103 drives the piston 109 to move upward to relieve the pressure.

[0044] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art without special instructions and limitations.

Claims

1. A test bench for multi-caliber safety valves, characterized in that: include: A platform (1), and a control component (4) fixedly mounted on the outer wall of the platform (1); A fixing mechanism (3), and a connecting fastener arranged on the fixing mechanism (3); A supporting mechanism (2), and a connecting member arranged on the supporting mechanism (2); The support mechanism (2) is fixedly connected to the bottom of the platform (1) via a connecting piece, and the fixing mechanism (3) is fixedly connected to the top of the platform (1) via a connecting fastener; The fixing mechanism (3) comprises a support seat (31), the support seat (31) is fixedly connected to the platform (1), the outer wall of the support seat (31) is fixedly connected to an electric push rod (32), the output end of the electric push rod (32) is fixedly connected to a connecting rod (33), a through hole (34) is provided in the middle of the connecting rod (33), the inner wall of the through hole (34) is slidably connected to a limit rod (312), and the end of the limit rod (312) away from the electric push rod (32) is fixedly connected to a fixed A fixed block (35), one end of the limit rod (312) close to the fixed block (35) is fixedly connected to a fixed plate (36), the top of the fixed plate (36) is fixedly connected to a spring plate (37), one end of the spring plate (37) away from the fixed plate (36) is fixedly connected to the connecting rod (33), the outer wall of the limit rod (312) is fixedly connected to a supporting rod (38), the top of the platform (1) is fixedly connected to a limit plate (39), and the limit plate (39) is in contact with the supporting rod (38).

2. A test bench for multi-caliber safety valves according to claim 1, characterized in that: A compression spring (311) is fixedly connected to the bottom of the connecting rod (33); one end of the compression spring (311) away from the connecting rod (33) is fixedly connected to a limiting rod (312); a positioning plate (313) is fixedly connected to the bottom of the limiting rod (312); and one end of the connecting rod (33) close to the compression spring (311) is fixedly connected to a supporting plate (310).

3. A test bench for multi-caliber safety valves according to claim 2, characterized in that: The limiting rod (312) is located in the middle of the through hole (34), the fixing plate (36) is located above the fixing block (35), the supporting plate (310) is located at the bottom of the fixing block (35), and the supporting rod (38) is located at an end of the limiting rod (312) away from the fixing block (35).

4. A test bench for multi-caliber safety valves according to claim 1, characterized in that: The platform (1) comprises a shell (101), the top of the shell (101) is fixedly connected to a limit block (102), a slide groove (110) is provided on the top of the shell (101), the slide groove (110) passes through the shell (101), and the slide groove (110) passes through the limit block (102).

5. A test bench for multi-caliber safety valves according to claim 4, characterized in that: The inner wall of the shell (101) is fixedly connected to a base (105), the top of the base (105) is fixedly connected to a connecting pipe (104), the middle of the connecting pipe (104) is connected to the middle of the limit block (102), the bottom of the connecting pipe (104) is fixedly connected to a connecting pipe (106), the connecting pipe (106) passes through the shell (101), and the connecting pipe (106) is connected to the connecting pipe (104).

6. A test bench for multi-caliber safety valves according to claim 5, characterized in that: A hydraulic rod (103) is fixedly connected to the inner wall of the housing (101); a piston (109) is fixedly connected to the output end of the hydraulic rod (103); the piston (109) is located inside the connecting pipe (104); a support rod (108) is fixedly connected to the outer wall of the hydraulic rod (103); the support rod (108) is located above the positioning plate (313); a support (107) is fixedly connected to the inner wall of the housing (101); and the support (107) is fixedly connected to the connecting pipe (104).

7. A test bench for multi-caliber safety valves according to claim 6, characterized in that: The support mechanism (2) comprises a cylinder (21), the inner wall of the cylinder (21) being fixedly connected to a fixing ring (22), the top of the fixing ring (22) being fixedly connected to a return spring (23), and one end of the return spring (23) away from the fixing ring (22) being fixedly connected to a support plate (24).

8. A test bench for multi-caliber safety valves according to claim 7, characterized in that: The support plate (24) is fixedly connected to the bottom of the housing (101); a round rod (25) is fixedly connected to one end of the support plate (24) close to the return spring (23); the round rods (25) are evenly distributed around the return spring (23); a circular groove (26) is formed on the outer wall of the cylinder (21); the round rods (25) are located inside the circular groove (26); and the round rods (25) are slidably connected to the cylinder (21) via the circular groove (26).

9. A test bench for multi-caliber safety valves according to claim 8, characterized in that: A moving rod (27) is slidably connected to the middle of the cylinder (21), a supporting ring (210) is fixedly connected to the bottom of the fixing ring (22), one end of the supporting ring (210) away from the fixing ring (22) is fixedly connected to the inner wall of the cylinder (21), and the moving rod (27) passes through the supporting ring (210).

10. A test bench for multi-caliber safety valves according to claim 9, characterized in that: A cylinder (28) is fixedly connected to the bottom of the support plate (24), the cylinder (28) passes through the return spring (23), the cylinder (28) is slidably connected to the inner wall of the fixing ring (22), and a square groove (29) is formed on the outer wall of the cylinder (28).

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