Checking table for multi-caliber safety valve

Abstract

The invention discloses a verification table for a multi-caliber safety valve, and relates to the technical field of verification tables, the verification table comprises a fixing mechanism and a connecting fastener arranged on the fixing mechanism; the fixing mechanism comprises a supporting seat, an electric push rod is fixedly connected to the outer wall of the supporting seat, a connecting rod is fixedly connected to the output end of the electric push rod, a through hole is formed in the middle of the connecting rod, and a limiting rod is slidably connected to the inner wall of the through hole. According to the verification table for the multi-caliber safety valves, the limiting rods drive the fixing blocks to move upwards in the through holes, then the safety valves with different calibers on the limiting blocks are clamped, the applicability of equipment is improved, meanwhile, flange plates of the safety valves are clamped through the fixing plates and the fixing blocks, the safety valves are prevented from being separated from the equipment during verification, and the verification efficiency is improved. And the safety valve is clamped and fixed in the axial direction and the radial direction through the fixing mechanism, so that the fixity of the equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of calibration benches, in particular to a calibration bench for multi-caliber safety valves. Background Art

[0002] Safety valve is an overpressure protection device, which is widely used in pressure-bearing equipment such as boilers, pressure vessels, and pressure pipelines, especially pressure-bearing special equipment. In order to ensure the intrinsic safety of pressure-bearing special equipment, one or more safety valves are generally installed at the highest pressure point of the pressure-bearing parts. For this reason, safety valves have become an important safety accessory to ensure the safe operation of special equipment. During use, the discharge pressure of the safety valve will change due to the influence of the medium, operating status, etc. For this reason, the special equipment safety technical specifications and corresponding laws, regulations, standards, etc. have put forward provisions for mandatory verification of safety valves. For example, the safety valves on boilers, pressure vessels or pressure pipelines should be verified every year.

[0003] Safety valves are automatic valves, mainly used in boilers, pressure vessels and pipelines, to control the pressure not to exceed the specified value, and play an important role in protecting personal safety and equipment operation, so safety valves must be pressure tested before use. The previous calibration platform was highly specialized and could not be applied to safety valves of different sizes. When fixing mismatched safety valves, the stability was poor. When targeting safety valves of different sizes and types, multiple calibration equipment needed to be prepared, thus reducing the practicality and scope of application of the calibration equipment. Summary of the invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A calibration bench for multi-caliber safety valves, comprising a platform, and a control component fixedly mounted on the outer wall of the platform; A fixing mechanism, and a connecting fastener arranged on the fixing mechanism; A supporting mechanism, and a connecting member arranged on the supporting mechanism; The supporting mechanism is fixedly connected to the bottom of the platform via a connecting piece, and the fixing mechanism is fixedly connected to the top of the platform via a connecting fastener; The fixing mechanism comprises a supporting seat, the supporting seat is fixedly connected to the platform, the outer wall of the supporting seat is fixedly connected with an electric push rod, the output end of the electric push rod is fixedly connected with a connecting rod, a through hole is opened in the middle of the connecting rod, the inner wall of the through hole is slidably connected with the limit rod, and the limit rod is set as an E-shaped plate. During operation, the safety valve is placed on the limit block, and the electric push rod works, so that the electric push rod pushes the connecting rod to move toward the safety valve. At the same time, the supporting rod on the limit rod slides on the top of the limit plate, and extrusion is generated between the supporting rod and the limit plate, so that the limit rod drives the fixed block to move upward inside the through hole, thereby clamping safety valves of different calibers on the limit block, thereby improving the applicability of the equipment. At the same time, the flange of the safety valve is clamped by the fixing plate and the fixing block to prevent the safety valve from detaching from the equipment during calibration, resulting in inaccurate calibration results. The axial and radial directions of the safety valve are adjusted by the fixing mechanism. The top of the limit plate is set to be inclined, and the top of the fixed block is set to be inclined, so as to reduce the partial contact area, so as to reduce the wear of the safety valve flange during clamping.

[0005] Preferably, a compression spring is fixedly connected to the bottom of the connecting rod. The compression spring is elastic and plays a resetting role. The end of the compression spring away from the connecting rod is fixedly connected to the limit rod. The bottom of the limit rod is fixedly connected to a positioning plate. The end of the connecting rod close to the compression spring is fixedly connected to a supporting plate. The supporting plate is set in a stepped shape. During operation, it can be slidably connected to the through groove on the limit block to play a guiding role, while forming a sealed space between the limit block and the safety valve.

[0006] The limiting rod is located in the middle of the through hole, the fixing plate is located above the fixing block, the supporting plate is located at the bottom of the fixing block, and the supporting rod is located at one end of the limiting rod away from the fixing block.

[0007] Preferably, the platform includes a shell, the outer wall of the shell is provided with heat dissipation holes, the top of the shell is fixedly connected to a limit block, the limit block is arranged in a stepped manner, and can be used to place safety valves of different calibers, a circular hole is arranged in the middle of the limit block, and the outer wall of each step of the limit block is provided with a thread, the thread on the outer wall of the limit block can be threadedly connected with the inner wall of the safety valve pipeline, and the safety valve is limited by the mutual cooperation between the threads, and the axis deviation during the safety valve calibration can be avoided, and the safety valve and the limit block are connected by a threaded connection, so that the connection has better sealing performance, and leakage can be avoided to affect the calibration result, a slide groove is arranged on the top of the shell, a connecting rod is located inside the slide groove, and the connecting rod is slidably connected to the slide groove, the slide groove passes through the shell, and the slide groove passes through the limit block.

[0008] Preferably, the inner wall of the shell is fixedly connected to a base, the top of the base is fixedly connected to a connecting pipe, the connecting pipe is provided with four pipe openings, consisting of a middle pipe and three side pipes, and the outer wall of the middle pipe is connected to the three side pipes, and the three pipes are evenly distributed with the middle pipe as the center. During operation, after the safety valve is fixed, the bottom of the connecting pipe is connected to the water pipe to allow water to enter the inside of the connecting pipe, and a piston is set on the top of the three outer tubes to fill the connecting pipe 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 middle pipe moves upward, and the inner cavity of the safety valve is subjected to pressure, thereby detecting the pressure of the safety valve, and the middle part of the connecting pipe is connected to the middle part of the limit block, and the bottom of the connecting pipe is fixedly connected to a connecting pipe, the connecting pipe runs through the shell, and the connecting pipe is connected to the connecting pipe.

[0009] Preferably, a hydraulic rod is fixedly connected to the inner wall of the shell, and a piston is fixedly connected to the output end of the hydraulic rod. The piston is located inside the connecting pipe, and a support rod is fixedly connected to the outer wall of the hydraulic rod. During operation, the hydraulic rod drives the piston to move downward, so that the water inside the side pipe flows to the middle pipe, and then the water level in the middle pipe rises, and at the same time, the inside of the safety valve is subjected to pressure. As the piston moves, the pressure on the safety valve gradually increases. By setting a support rod, the support rod collides with the positioning plate during its downward movement and stops moving downward, so that the equipment can adjust the pressure according to 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 shell, and the support is fixedly connected to the connecting pipe.

[0010] Preferably, the supporting mechanism comprises a cylinder, the inner wall of the cylinder is fixedly connected with a fixing ring, the top of the fixing ring is fixedly connected with a return spring, the end of the return spring away from the fixing ring is fixedly connected with a support plate, the support plate is fixedly connected to the bottom of the shell, the support plate is fixedly connected to the end of the support plate close to the return spring is fixedly connected with a round rod, when the safety valve is pressure-checked, the platform may vibrate during mechanical operation, by arranging the return spring, when the equipment vibrates, the support plate moves downward, the return spring is compressed, and the elasticity of the return spring is utilized to play a buffering role, the round rods are evenly distributed with the return spring as the center, the outer wall of the cylinder is provided with a circular groove, the round rod is located inside the circular groove, the round rod is slidably connected to the cylinder through the circular groove, and the center of the cylinder The top of the moving rod is set to be inclined so that the moving rod is forced to move toward the direction of the cylinder, and then the end of the moving rod close to the supporting ring is clamped with the square groove, and the support plate cannot rebound, and the equipment needs to be repaired to avoid inaccurate verification data caused by excessive vibration amplitude. The bottom of the fixed ring is fixedly connected to the supporting ring, and the end of the supporting ring away from the fixed ring is fixedly connected to the inner wall of the cylinder, the moving rod passes through the supporting ring, and the bottom of the support plate is fixedly connected to a cylinder, the cylinder passes through a reset spring, the cylinder is slidably connected to the inner wall of the fixed ring, and the outer wall of the cylinder is provided with a square groove.

[0011] The present invention provides a test bench for multi-caliber safety valves, which has the following beneficial effects: 1. The inspection bench for multi-caliber safety valves has a supporting rod that slides on the top of the limit plate, and extrusion is generated between the supporting rod and the limit plate, so that the limit rod drives the fixed block to move upward inside the through hole, thereby clamping the safety valves of different calibers on the limit block, thereby improving the applicability of the equipment. At the same time, the flange of the safety valve is clamped by the fixed plate and the fixed block to prevent the safety valve from detaching from the equipment during inspection, resulting in inaccurate inspection results. The safety valve is clamped and fixed in both axial and radial directions by the fixing mechanism, thereby improving the fixity of the equipment.

[0012] 2. The inspection table for multi-caliber safety valves is provided with a tooth-shaped groove on the top of the limit plate, and the top of the limit plate is set to be inclined. From the electric push rod to the fixed block, the limit plate is inclined from low to high. When working, the fixed block can be consistent with the height of different steps through the inclined setting of the top of the limit plate, which is convenient for clamping safety valves of different calibers.

[0013] 3. The calibration bench for multi-caliber safety valves is set to be stepped through the limit block, and can be used to place safety valves of different calibers. A round hole is opened in the middle of the limit block, and the outer wall of each step of the limit block is provided with a thread. The thread on the outer wall of the limit block can be connected with the thread on the inner wall of the safety valve pipeline. The safety valve is limited by the mutual cooperation between the threads, and the axis deviation during the safety valve calibration can be avoided. The safety valve and the limit block are connected by threads, so that the connection has better sealing performance, avoiding leakage affecting the calibration result.

[0014] Fourth, the inspection bench for multi-caliber safety valves increases the pressure on the safety valve gradually as the piston moves. A support rod is provided, and when the support rod moves downward, it collides with the positioning plate and stops moving downward, so that the equipment can adjust the pressure according to the different pressure thresholds of safety valves of different calibers.

[0015] 5. The calibration bench for multi-caliber safety valves is tilted by moving the rod near the top of the round rod so that the moving rod is forced to move toward the direction of the cylinder, thereby causing the end of the moving rod near the supporting ring to engage with the square groove, and the support plate cannot rebound. The equipment needs to be repaired to avoid inaccurate calibration data due to excessive vibration amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the external structure of a test bench for multi-caliber safety valves of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is a schematic diagram of the side view structure of the fixing mechanism of the present invention; Figure 5 It is a schematic diagram of a partial side view of the fixing mechanism of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the platform of the present invention; Figure 7 It is a schematic diagram of the supporting mechanism structure of the present invention; Figure 8 It is a cross-sectional structural diagram of the support mechanism of the present invention.

[0017] In the figure: 1. platform; 101. shell; 102. limit block; 103. hydraulic rod; 104. connecting pipe; 105. base; 106. connecting pipe; 107. support; 108. support rod; 109. piston; 110. slide groove; 2. supporting mechanism; 21. cylinder; 22. fixing ring; 23. return spring; 24. support plate; 25. round rod; 26. round groove; 27. moving rod; 28. cylinder; 29. ​​square groove; 210. supporting ring; 3. fixing mechanism; 31. supporting seat; 32. electric push rod; 33. connecting rod; 34. through hole; 35. fixing block; 36. fixing plate; 37. spring plate; 38. supporting rod; 39. limit plate; 310. supporting plate; 311. compression spring; 312. limit rod; 313. positioning plate; 4. control component. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0019] The first embodiment, as Figures 1 to 5 As shown, the present invention provides a technical solution: a calibration platform for multi-caliber safety valves, comprising 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 supporting mechanism 2 is fixedly connected to the bottom of the platform 1 through a connecting piece, and the fixing mechanism 3 is fixedly connected to the top of the platform 1 through a connecting fastener; Among them, the fixing mechanism 3 includes 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 the electric push rod 32, the output end of the electric push rod 32 is fixedly connected to the connecting rod 33, the middle part of the connecting rod 33 is provided with a through hole 34, the inner wall of the through hole 34 is slidably connected to the limit rod 312, and the limit rod 312 is set as an E-shaped plate. During the working process, the safety valve is placed on the limit block 102, and the electric push rod 32 works, so that the electric push rod 32 pushes the connecting rod 33 to move toward the safety valve, and at the same time The support rod 38 on the limit rod 312 slides on the top of the limit plate 39, and extrusion is generated between the support rod 38 and the limit plate 39, so that the limit rod 312 drives the fixing block 35 to move upward inside the through hole 34, thereby clamping the safety valves of different diameters on the limit block 102, thereby improving the applicability of the equipment. At the same time, the flange of the safety valve is clamped by the fixing plate 36 and the fixing block 35 to prevent the safety valve from detaching from the equipment during calibration, resulting in inaccurate calibration results. The axial and The clamping and fixing are performed in two radial directions to improve the fixation of the equipment. The end of the limit rod 312 away from the electric push rod 32 is fixedly connected to the fixing block 35. The top of the fixing block 35 is set to be inclined to reduce the partial contact area, so that when clamping, the wear on the safety valve flange is reduced. The end of the limit rod 312 close to the fixing block 35 is fixedly connected to the fixing plate 36. The top of the fixing plate 36 is fixedly connected to the spring plate 37. The spring plate 37 is elastic. The end of the spring plate 37 away from the fixing plate 36 is fixedly connected to the connecting rod 33. The top of the platform 1 is fixedly connected with a limit plate 39, and a tooth-shaped groove is arranged on the top of the limit plate 39, and the top of the limit plate 39 is arranged to be inclined, from the electric push rod 32 to the fixed block 35, and the inclination direction of the limit plate 39 is from low to high. When working, the inclination setting of the top of the limit plate 39 makes the fixed block 35 consistent with the height of different steps, so as to facilitate the clamping of safety valves of different calibers, and the limit plate 39 contacts the support rod 38.

[0020] The bottom of the connecting rod 33 is fixedly connected with a compression spring 311, which is elastic and plays a resetting role. The end of the compression spring 311 away from the connecting rod 33 is fixedly connected to the limit rod 312, and the bottom of the limit rod 312 is fixedly connected with a positioning plate 313. The end of the connecting rod 33 close to the compression spring 311 is fixedly connected with a support plate 310. The support plate 310 is set in a stepped shape. During operation, it can be slidably connected with the through groove on the limit block 102, playing a guiding role, and at the same time forming a sealed space between the limit block 102 and the safety valve.

[0021] 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 one end of the limiting rod 312 away from the fixing block 35 .

[0022] The second embodiment is based on the first embodiment. Figure 6 As shown, the platform 1 includes a shell 101, and the outer wall of the shell 101 is provided with heat dissipation holes. The top of the shell 101 is fixedly connected to a limit block 102. The limit block 102 is set to be stepped and can be used to place safety valves of different calibers. A circular hole is opened in the middle of the limit block 102, and the outer wall of each step of the limit block 102 is provided with a thread. The thread of the outer wall of the limit block 102 can be threadedly connected with the inner wall of the safety valve pipeline. The safety valve is limited by the mutual cooperation between the threads. At the same time, the axis deviation during the safety valve calibration can be avoided. The safety valve and the limit block 102 are connected by threads, so that the connection has better sealing performance, avoiding leakage affecting the calibration result. A slide groove 110 is opened on the top of the shell 101, and the connecting rod 33 is located inside the slide groove 110, and the connecting rod 33 is slidably connected to the slide groove 110. The slide groove 110 runs through the shell 101, and the slide groove 110 runs through the limit block 102.

[0023] The inner wall of the shell 101 is fixedly connected with a base 105, and the top of the base 105 is fixedly connected with a connecting pipe 104. The connecting pipe 104 is provided with four pipe openings, which are composed of a middle pipe and three side pipes, and the outer wall of the middle pipe is connected with the three side pipes, and the three pipes are evenly distributed with the middle pipe as the center. During operation, after the safety valve is fixed, the bottom of the connecting pipe 106 is connected to the water pipe, so that water enters the inside of the connecting pipe 104, and pistons are set on the tops of the three outer pipes to fill the connecting pipe 104 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, the inner cavity of the safety valve is subjected to pressure, and then the pressure of the safety valve is detected. The middle part of the connecting pipe 104 is connected to the middle part of the limit block 102, and the bottom of the connecting pipe 104 is fixedly connected with the connecting pipe 106, which runs through the shell 101 and is connected to the connecting pipe 104.

[0024] A hydraulic rod 103 is fixedly connected to the inner wall of the shell 101, and 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, and a support rod 108 is fixedly connected to the outer wall of the hydraulic rod 103. During operation, the hydraulic rod 103 drives the piston 109 to move downward, so that the water inside the side pipe flows to the middle pipe, and then the water level in the middle pipe rises. At the same time, the inside of the safety valve is subjected to pressure. As the piston 109 moves, the pressure on the safety valve gradually increases. By setting the support rod 108, the support rod 108 collides with the positioning plate 313 during its downward movement and stops moving downward, so that the equipment can adjust the pressure according to different pressure thresholds of safety valves of different calibers. The support rod 108 is located above the positioning plate 313. A support 107 is fixedly connected to the inner wall of the shell 101, and the support 107 is fixedly connected to the connecting pipe 104.

[0025] The third embodiment is based on the first and second embodiments. Figures 7 and 8 As shown, the supporting mechanism 2 includes a cylinder 21, a fixing ring 22 is fixedly connected to the inner wall of the cylinder 21, a reset spring 23 is fixedly connected to the top of the fixing ring 22, a support plate 24 is fixedly connected to the end of the reset spring 23 away from the fixing ring 22, the support plate 24 is fixedly connected to the bottom of the shell 101, and a round rod 25 is fixedly connected to the end of the support plate 24 close to the reset spring 23. When the safety valve is pressure-checked, the platform 1 may vibrate during mechanical operation. By setting the reset spring 23, when the equipment vibrates, the support plate 24 moves downward, the reset spring 23 is compressed, and the elastic performance of the reset spring 23 is utilized to play a buffering role. The round rods 25 are evenly distributed with the reset spring 23 as the center. A circular groove 26 is provided on the outer wall of the cylinder 21, and the round rod 25 is located inside the circular groove 26. The round rod 25 is slidably connected to the cylinder 21 through the circular groove 26, and the middle part of the cylinder 21 is slidably connected to the movable Rod 27, the moving rod 27 is set as 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 the moving rod 27 inside the circular groove 26 and produces extrusion. The moving rod 27 is set to be inclined near the top of the round rod 25, so that the moving rod 27 is forced to move in the direction of the cylinder 28, and then the end of the moving rod 27 close to the supporting ring 210 is engaged with the square groove 29, and the support plate 24 cannot rebound. The equipment needs to be repaired to avoid inaccurate verification data caused by excessive vibration amplitude. The bottom of the fixed ring 22 is fixedly connected with the supporting ring 210, and the end of the supporting ring 210 away from the fixed ring 22 is fixedly connected to the inner wall of the cylinder 21. The moving rod 27 passes through the supporting ring 210, and the bottom of the support plate 24 is fixedly connected with the cylinder 28. The cylinder 28 passes through the reset spring 23. The cylinder 28 is slidably connected to the inner wall of the fixed ring 22, and the outer wall of the cylinder 28 is provided with a square groove 29.

[0026] When in use, the safety valve is placed on the limit block 102, and the electric push rod 32 works, so that the electric push rod 32 pushes the connecting rod 33 to move toward the safety valve. At the same time, the supporting rod 38 on the limit rod 312 slides on the top of the limit plate 39, and extrusion is generated between the supporting rod 38 and the limit plate 39, so that the limit rod 312 drives the fixed block 35 to move upward inside the through hole 34, thereby clamping the safety valves of different calibers on the limit block 102.

[0027] After the safety valve is fixed, the bottom of the connecting pipe 106 is connected to the water pipe to allow water to enter the connecting pipe 104. A piston is set at the top of the three outer pipes to fill the connecting pipe 104 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 subjected to pressure, thereby detecting the pressure of the safety valve. After the verification is completed, the hydraulic rod 103 drives the piston 109 to move upward to release the pressure.

[0028] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

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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