Safety valve verification device

Abstract

The invention discloses a safety valve checking device, and relates to the technical field of pressure equipment checking, the safety valve checking device comprises a lifting rack and a checking rack arranged on one side of the lifting rack, two groups of symmetrically distributed electric ball screws are arranged on the lifting rack, conveying tables are arranged on the electric ball screws, and two positioning tables are arranged on the checking rack. The conveying table can carry the safety valve to move to the position above the verification rack, so that the safety valve gets close to the positioning table. The transverse moving frame is installed on the conveying table, the linkage frame is fixed to the transverse moving frame, the bearing supporting table and the linkage frame can move synchronously, and the bearing supporting table is used for containing the safety valve. In the verification process, the safety valve does not need to be manually placed on the positioning table, the time needed for manually carrying the safety valve and the consumed labor amount are reduced, and the device has the advantage of being convenient to operate. In the process of continuously verifying a plurality of safety valves, the time consumed in the manual carrying and butt joint process is shortened, and the verification operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure equipment inspection, and in particular to a safety valve inspection device. Background Art

[0002] Boosting the pressure of the safety valve on the calibration bench is a key step in verifying the set pressure (trip pressure), and it must be carried out strictly in accordance with the standard process to ensure the accuracy and safety of the calibration results. Before boosting the pressure, the safety valve needs to be firmly installed on the special fixture of the calibration bench to ensure that the valve body and the interface of the calibration bench are well sealed to avoid leakage. It is also necessary to connect the pressure source (such as an air pump or a hydraulic pump) and the pressure measuring instrument of the calibration bench. Subsequently, check the system sealing, close the pressure relief valve of the calibration bench, slowly pressurize to a low pressure (such as 0.5 times the set pressure), observe whether the pressure gauge is stable, and confirm that there is no leakage to set the target pressure, and determine the target value according to the set pressure (or design requirements) marked on the safety valve nameplate (for example, the set pressure is 1.0MPa).

[0003] During the boosting operation, it is necessary to open the pressure valve of the calibration bench and slowly increase the pressure through a hand pump, pneumatic pump or electric pump. The boosting rate is generally controlled at ≤0.01MPa / s (or as required by the standard) to avoid sudden changes in pressure that affect the test accuracy. During the boosting process, it is necessary to observe the real-time pressure value of the high-precision pressure gauge (or digital display). When it is close to the set pressure (such as 90% of the target value), further reduce the boosting speed. When the safety valve disc suddenly opens (accompanied by an obvious exhaust sound or the pressure gauge pointer suddenly falls back), immediately record the pressure value at this time, which is the actual set pressure. After the pressure is released until the safety valve is completely closed, repeat the boosting operation 2-3 times, and take the average of multiple measurement results as the final set pressure. The system automatically records the pressure value at the moment the safety valve opens and generates a data curve.

[0004] In the existing off-line calibration equipment applied to safety valves, during the calibration operation, due to the large size of the safety valve, most of the calibration operations can only be performed on one safety valve at a time. Moreover, before the calibration operation, most of the safety valves need to be manually moved to the calibration table and fixed by an auxiliary positioning fixture before the calibration operation can be performed. During the operation, it takes a long time and a lot of labor to manually carry, adjust and position the safety valve. If it is necessary to perform calibration operations on multiple safety valves continuously, the efficiency of the calibration operation is low. Therefore, the present invention provides a safety valve calibration device to meet the needs. Summary of the invention

[0005] In view of the above problems, the present invention provides a safety valve calibration device.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safety valve calibration device, comprising a lifting frame and a calibration frame arranged on one side thereof, the lifting frame is provided with two groups of symmetrically distributed electric ball screws, the electric ball screws are each provided with a conveying platform, the calibration frame is provided with two positioning platforms, the conveying platform can carry the safety valve and move it to the top of the calibration frame, so that the safety valve is close to the positioning platform.

[0007] It also includes a transverse frame installed on the conveying platform, a linkage frame fixed on the transverse frame, and a bearing support platform that can move synchronously with the linkage frame, and the bearing support platform is used to place the safety valve. When the safety valve moves to the top of the inspection machine frame, the transverse frame, the linkage frame and the bearing support platform can move toward the positioning platform until the bearing support platform moves to the top of the positioning platform. The positioning platform is provided with a valve unloading structure that can separate the safety valve from the bearing support platform. The valve unloading structure can make the safety valve and the positioning platform relative to each other, and the test inlet of the safety valve corresponds to the pressurization interface provided below the positioning platform.

[0008] Furthermore, the unloading valve structure includes two positioning rods symmetrically distributed above the positioning platform, the positioning rods are both arc-shaped structures, and the positioning rods are fixed with connecting rods that can move synchronously with them, and the positioning platform is provided with a pair of channels that can accommodate the connecting rods to pass through.

[0009] The connecting rod is provided with a connecting sleeve at one end located below the calibration frame, and the two connecting sleeves located below the same positioning platform are connected by an electric bidirectional lead screw. A guide rod parallel to the electric bidirectional lead screw is provided on one side of the connecting sleeve, and the end of the connecting sleeve away from the electric bidirectional lead screw is sleeved on the guide rod. When the electric bidirectional lead screw drives the two connecting sleeves and the connecting rod to move toward the pressurized interface, the locking rod is clamped on the safety valve body.

[0010] Furthermore, the valve unloading structure also includes a lifting frame connecting the electric bidirectional screw and the guide rod, and a positioning hanger is provided above the lifting frame and distributed parallel to it. A second pneumatic component that can control the rise of the lifting frame is installed in the positioning hanger. As the lifting frame rises, the locking rod clamped on the safety valve body can lift the safety valve.

[0011] Furthermore, a support plate parallel to the conveying platform is fixed on the conveying platform, and the carrying platform is located directly above the support plate.

[0012] The transverse frame is slidably installed on the support plate, and a first driving gear meshing with the rack inside the transverse frame is provided on the support plate, and a driving structure that can control the rotation of the first driving gear is provided under the support plate. As the first driving gear rotates, the transverse frame, the linkage frame and the supporting bracket move horizontally synchronously.

[0013] Furthermore, a bracket is provided on the side of the carrying platform opposite to the support plate, and a driving gear ring and three sets of synchronous gear groups equidistantly distributed along a circular trajectory on the inner side of the driving gear ring are provided in the interlayer space between the carrying platform and the bracket. Each set of synchronous gear groups is composed of two synchronous gears distributed in parallel and a synchronous shaft connecting the two synchronous gears in series, and the synchronous shaft is rotatably mounted on the bracket.

[0014] The upper synchronous gear in each set of synchronous gear groups is meshed with the inner ring gear block of the driving gear ring, and the lower synchronous gear in each set of synchronous gear groups is meshed and connected with a synchronous frame, which is slidably installed on the bracket, and an extension rod extending to the top of the supporting platform is fixed on the synchronous frame, and the extension rod is provided with a vertically distributed positioning roller group.

[0015] Furthermore, a second driving gear is provided in the interlayer space between the supporting platform and the bracket, the second driving gear is meshed with the outer ring gear block of the driving gear ring, and a driving structure capable of controlling the rotation of the second driving gear is installed on the supporting platform.

[0016] Furthermore, the linkage frame is provided with a first pneumatic component and two symmetrically distributed guide rails, both ends of the carrying platform are slidably connected to the guide rails, and the output end of the first pneumatic component is connected to the two ends of the carrying platform.

[0017] Furthermore, the positioning platforms are each provided with a sealing gasket, and when the safety valve is connected to the positioning platform, the sealing gasket is located outside the valve body of the safety valve.

[0018] In summary, the technical effects and advantages of the present invention are as follows: 1. In the process of calibration, the present invention does not need to manually place the safety valve on the positioning table, which reduces the time and labor required for manual handling of the safety valve and has the advantage of portable operation. In the process of continuous calibration of multiple safety valves, the time consumed in manual handling and docking is reduced, and the efficiency of the calibration operation is improved.

[0019] 2. When the safety valve is connected to the pressurized interface required for calibration, the present invention can enable the safety valve to be stably and accurately connected to the positioning platform, ensuring that the airflow flowing in the pressurized interface can accurately and comprehensively flow into the interior of the safety valve, effectively avoiding the phenomenon of airflow overflow, improving the accuracy of the test data, and further ensuring the accuracy of the calibration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the conveyor platform of the present invention.

[0023] Figure 3 This is a schematic structural diagram of the conveying platform of the present invention from a second viewing angle.

[0024] Figure 4 It is a schematic diagram of the structure of the support plate and the load-bearing platform after being cut apart.

[0025] Figure 5 This is a schematic diagram of the positions of the driving gear ring, synchronous gear set and synchronous frame of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the inspection frame of the present invention after being cut open.

[0027] Figure 7 For the present invention Figure 6 The enlarged structural diagram at a in the middle.

[0028] Figure 8 It is a schematic diagram of the state when the carrying platform of the present invention moves to above the positioning platform.

[0029] Fig. 9 For the present invention Figure 8 The enlarged structural diagram at point b in the middle.

[0030] In the figure: 1. lifting frame; 2. electric ball screw; 3. conveying platform; 31. support plate; 32. first driving gear; 33. transverse frame; 34. linkage frame; 35. first pneumatic component; 36. guide rail; 4. calibration frame; 5. positioning platform; 51. pressurization interface; 52. sealing gasket; 6. bearing bracket; 61. bracket; 62. driving gear ring; 63. synchronous gear set; 64. synchronous frame; 65. extension rod; 66. positioning roller set; 67. second driving gear; 7. positioning rod; 8. connecting rod; 9. connecting sleeve; 10. electric bidirectional screw; 11. guide rod; 12. lifting frame; 13. positioning hanger; 14. second pneumatic component. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1: Reference Figure 1 , Figure 2 A safety valve calibration device shown in the figure comprises a lifting frame 1 and a calibration frame 4 arranged on one side thereof, the lifting frame 1 is provided with two groups of symmetrically distributed electric ball screws 2, each of the electric ball screws 2 is provided with a conveying platform 3, and the calibration frame 4 is provided with two positioning platforms 5, and the conveying platform 3 can carry the safety valve and move it above the calibration frame 4 so that the safety valve is close to the positioning platform 5.

[0033] In this process, there is no need to manually place the safety valve on the positioning platform 5, which reduces the time and labor required for manual handling of the safety valve, and has the advantage of portable operation. In the process of continuously performing calibration operations on multiple safety valves, the time consumed in the manual handling and docking process is reduced, and the efficiency of the calibration operation is improved.

[0034] For further information, see Figure 2 As shown, when the safety valve is lifted to a certain height and close to the positioning platform 5, in order to enable the safety valve to be stably and accurately connected to the positioning platform 5, the present invention also includes a transverse frame 33 installed on the conveying platform 3, a linkage frame 34 fixed on the transverse frame 33, and a supporting platform 6 that can move synchronously with the linkage frame 34, and the supporting platform 6 is used to place the safety valve.

[0035] See also Figure 8 , Fig. 9 As shown, when the safety valve moves to the top of the inspection frame 4, the transverse frame 33, the linkage frame 34 and the bearing bracket 6 can move toward the positioning platform 5 until the bearing bracket 6 moves to the top of the positioning platform 5. The positioning platform 5 is provided with a valve unloading structure that can separate the safety valve from the bearing bracket 6. The valve unloading structure can make the safety valve and the positioning platform 5 connected to each other. The test inlet of the safety valve corresponds to the pressurization interface 51 provided below the positioning platform 5.

[0036] The combination of the valve unloading unit and the movable supporting platform 6 can enable the safety valve to be stably and accurately connected to the positioning platform 5, and further enable the safety valve to be stably and accurately connected to the pressurizing interface 51, ensuring that the airflow flowing in the pressurizing interface 51 can flow accurately and comprehensively into the interior of the safety valve, effectively avoiding the phenomenon of airflow overflow. After the safety valve receives the test airflow, it performs a calibration operation based on its pressure data, thereby improving the accuracy of the test data and further ensuring the accuracy of the calibration process.

[0037] For details, see Figure 6 , Figure 7 As shown, the unloading valve structure includes two positioning rods 7 symmetrically distributed above the positioning platform 5. The positioning rods 7 are both arc-shaped structures, and connecting rods 8 that can move synchronously with them are fixed on the positioning rods 7. The positioning platform 5 is provided with a pair of channels that can accommodate the connecting rods 8 to pass through.

[0038] like Figure 7 As shown, a connecting sleeve 9 is provided at one end of the connecting rod 8 located below the calibration frame 4, and the two connecting sleeves 9 located below the same positioning platform 5 are connected by an electric bidirectional lead screw 10. A guide rod 11 parallel to the electric bidirectional lead screw 10 is provided on one side of the connecting sleeve 9, and one end of the connecting sleeve 9 away from the electric bidirectional lead screw 10 is sleeved on the guide rod 11. When the electric bidirectional lead screw 10 drives the two connecting sleeves 9 and the connecting rod 8 to move toward the pressurizing interface 51, the locking rod 7 is clamped on the safety valve body.

[0039] It is worth mentioning that in the existing safety valve body, the area below the valve disc is narrower than the area in the valve body facing the valve disc, and the area is usually connected to the flange at its bottom end. When the positioning rod 7 is clamped on the safety valve body, it is actually clamped with the area.

[0040] like Figure 7 As shown, the valve unloading structure also includes a lifting frame 12 connecting the electric bidirectional screw 10 and the guide rod 11, and a positioning hanger 13 is arranged above the lifting frame 12 and distributed parallel to it. The positioning hanger 13 is installed with a second pneumatic component 14 that can control the rise of the lifting frame 12. As the lifting frame 12 rises, the locking rod 7 clamped on the safety valve body can lift the safety valve so that the safety valve is separated from the supporting platform 6.

[0041] After the safety valve detaches from the supporting platform 6, the supporting platform 6 can slide away from the positioning platform 5, leaving the valve unloading structure to support the valve body of the safety valve. Subsequently, under the action of the second pneumatic component 14, the lifting frame 12, the electric bidirectional screw 10, the guide rod 11, the connecting sleeve 9, the connecting rod 8 and the positioning rod 7 can be lowered to the original position, so that the safety valve is lowered to dock with the positioning platform 5. At this time, the test inlet of the safety valve corresponds to the pressurized interface 51 provided below the positioning platform 5.

[0042] like Figure 3 , Figure 4As shown, a support plate 31 parallel to the conveying platform 3 is fixed thereon, and the carrying platform 6 is located directly above the support plate 31. The transverse frame 33 is slidably mounted on the support plate 31, and a first driving gear 32 meshing with the rack on the inner side of the transverse frame 33 is provided on the support plate 31, and a driving structure capable of controlling the rotation of the first driving gear 32 is provided below the support plate 31. With the rotation of the first driving gear 32, the transverse frame 33, the linkage frame 34 and the carrying platform 6 are synchronously transversely moved, so as to achieve the purpose of moving the safety valve toward the direction of the positioning platform 5. After the safety valve is docked with the positioning platform 5, the transverse frame 33, the linkage frame 34 and the carrying platform 6 can be synchronously transversely moved and reset to implement the subsequent safety valve transfer operation.

[0043] Therefore, during the safety valve calibration process, under the premise of not affecting the normal implementation of the calibration operation, the transverse frame 33, the linkage frame 34 and the supporting platform 6 can continue to transport the remaining safety valves. In the process of continuously implementing calibration operations on multiple safety valves, the time required for the safety valve loading and calibration operations is saved, thereby improving work efficiency.

[0044] Example 2: Figure 4 , Figure 5 As shown, on the basis of Example 1, a bracket 61 is provided on the side of the supporting platform 6 facing the supporting plate 31 in the present invention, a driving gear ring 62 and three sets of synchronous gear sets 63 equidistantly distributed along a circular trajectory on the inner side of the driving gear ring 62 are provided in the interlayer space between the supporting platform 6 and the bracket 61, each set of synchronous gear sets 63 is composed of two synchronous gears distributed in parallel and a synchronous shaft connecting the two synchronous gears in series, and the synchronous shaft is rotatably installed on the bracket 61.

[0045] like Figure 5 As shown, the upper synchronous gears in each set of synchronous gear groups 63 are meshed with the inner ring gear blocks of the driving gear ring 62, and the lower synchronous gears in each set of synchronous gear groups 63 are meshed and connected with a synchronous frame 64, which is slidably installed on the bracket 61, and an extension rod 65 extending to the top of the supporting platform 6 is fixed on the synchronous frame 64, and a vertically distributed positioning roller group 66 is provided on the extension rod 65.

[0046] When the driving gear ring 62 rotates, the three sets of synchronous gear sets 63 can rotate in the same direction, so that the synchronous frame 64 can move along a straight line. When the synchronous frame 64 moves toward the central axis position of the driving gear ring 62, the extension rod 65 can move toward the safety valve located on the supporting platform 6 until the positioning roller set 66 abuts against the safety valve.

[0047] like Figure 4 , Figure 5As shown, in order to enable the driving gear ring 62 to rotate smoothly, a second driving gear 67 is provided in the interlayer space between the supporting platform 6 and the bracket 61, and the second driving gear 67 is meshed with the outer ring gear block of the driving gear ring 62, and a driving structure that can control the rotation of the second driving gear 67 is installed on the supporting platform 6. The combination of the second driving gear 67 and the driving structure can provide power for the rotation of the driving gear ring 62 and the synchronous gear set 63, ensuring that the three sets of positioning roller sets 66 can clamp the safety valve.

[0048] like Figure 4 As shown, the combination of multiple positioning roller groups 66 has a positioning effect on the safety valve, ensures the stability of the safety valve during transportation, improves the accuracy of the position distribution of the safety valve when it is initially moved above the positioning platform 5, and ensures that the unloading valve structure can be accurately docked with the safety valve.

[0049] Furthermore, when the unloading valve structure lifts the safety valve and causes the safety valve to detach from the supporting platform 6, based on the setting of multiple positioning roller groups 66, the safety valve during the rising process can slide along the distribution direction of the positioning roller groups 66, thereby ensuring the stability of the safety valve during the rising process, allowing the safety valve to rise accurately along a straight path, and further improving the accuracy of the subsequent safety valve descent and docking with the pressurizing interface 51.

[0050] Embodiment 3: Based on Embodiment 1 and Embodiment 2, Figure 2 , Figure 4 As shown, after the support platform 6 moves to the top of the positioning platform 5 and the valve unloading structure lifts the safety valve, a space is left for the safety valve to fall straight down so that the support platform 6 can quickly move away from the positioning platform 5. A first pneumatic assembly 35 and two symmetrically distributed guide rails 36 are provided on the linkage frame 34. Both ends of the support platform 6 are slidably connected to the guide rails 36, and the output end of the first pneumatic assembly 35 is connected to both ends of the support platform 6.

[0051] The first pneumatic assembly 35 can control the support platform 6 to move quickly along the distribution direction of the linkage frame 34, ensuring that the support platform 6 quickly moves away from the positioning platform 5, so that the safety valve can quickly fall along a straight path and connect with the positioning platform 5 and the pressurized interface 51 below it.

[0052] Furthermore, when the conveying platform 3 is in the lower position of the lifting frame 1 and is waiting to be safely placed on the surface of the carrying platform 6, in order to facilitate the placement of the safety valve on the surface of the carrying platform 6 at different positions, the first pneumatic component 35 can control the carrying platform 6 to move along the distribution direction of the linkage frame 34, so that the carrying platform 6 can be adjusted according to the actual position of the safety valve to receive the safety valve, thereby reducing the workload during the transportation process.

[0053] like Fig. 9As shown, a sealing gasket 52 is provided on the positioning platform 5. When the safety valve is connected to the positioning platform 5, the sealing gasket 52 is located outside the valve body of the safety valve. The provision of the sealing gasket 52 can improve the tightness of the connection between the safety valve and the positioning platform 5.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety valve inspection device, comprising a lifting frame (1) and a inspection frame (4) arranged on one side thereof, characterized in that: The lifting frame (1) is provided with two groups of symmetrically distributed electric ball screws (2), each of which is provided with a conveying platform (3), and the inspection frame (4) is provided with two positioning platforms (5). The conveying platform (3) can carry the safety valve and move it to the top of the inspection frame (4), so that the safety valve is close to the positioning platform (5); It also includes a transverse frame (33) installed on the conveying platform (3), a linkage frame (34) fixed on the transverse frame (33), and a bearing support platform (6) that can move synchronously with the linkage frame (34), wherein the bearing support platform (6) is used to place the safety valve; when the safety valve moves to the top of the inspection machine frame (4), the transverse frame (33), the linkage frame (34) and the bearing support platform (6) can move toward the positioning platform (5) until the bearing support platform (6) moves to the top of the positioning platform (5), and the positioning platform (5) is provided with a valve unloading structure that can separate the safety valve from the bearing support platform (6), and the valve unloading structure can make the safety valve and the positioning platform (5) relative to each other, and the test inlet of the safety valve corresponds to the pressurizing interface (51) provided below the positioning platform (5).

2. The safety valve inspection device according to claim 1, characterized in that: The unloading valve structure comprises two locking rods (7) symmetrically distributed above the positioning platform (5), the locking rods (7) are both arc-shaped structures, and connecting rods (8) are fixed on the locking rods (7) and can move synchronously with them, and the positioning platform (5) is provided with a pair of channels that can accommodate the connecting rods (8) to pass through; The connecting rod (8) is provided with a connecting sleeve (9) at one end located below the calibration frame (4); the two connecting sleeves (9) located below the same positioning platform (5) are connected via an electric bidirectional lead screw (10); one side of the electric bidirectional lead screw (10) is provided with a guide rod (11) parallel to the electric bidirectional lead screw (10); the end of the connecting sleeve (9) away from the electric bidirectional lead screw (10) is sleeved on the guide rod (11); when the electric bidirectional lead screw (10) drives the two connecting sleeves (9) and the connecting rod (8) to move toward the pressurizing interface (51), the locking rod (7) is clamped on the safety valve body.

3. The safety valve inspection device according to claim 2, characterized in that: The valve unloading structure also includes a lifting frame (12) connecting the electric bidirectional screw (10) and the guide rod (11); a positioning hanger (13) is arranged above the lifting frame (12) and is distributed parallel to the lifting frame; a second pneumatic component (14) is installed in the positioning hanger (13) for controlling the lifting frame (12) to rise; as the lifting frame (12) rises, the locking rod (7) clamped on the safety valve body can lift the safety valve.

4. The safety valve inspection device according to claim 1, characterized in that: A support plate (31) parallel to the conveying platform (3) is fixed on the conveying platform (3), and the carrying support platform (6) is located directly above the support plate (31); The transverse moving frame (33) is slidably mounted on the support plate (31); a first driving gear (32) meshing with a rack on the inner side of the transverse moving frame (33) is provided on the support plate (31); and a driving structure capable of controlling the rotation of the first driving gear (32) is provided below the support plate (31); as the first driving gear (32) rotates, the transverse moving frame (33), the linkage frame (34) and the supporting platform (6) are synchronously transversely moved.

5. The safety valve testing device according to claim 4, characterized in that: A bracket (61) is provided on one side of the support platform (6) facing the support plate (31); a driving gear ring (62) and three sets of synchronous gear sets (63) are arranged in the interlayer space between the supporting platform (6) and the bracket (61) and are located inside the driving gear ring (62) and are equidistantly distributed along a circumferential track; each set of synchronous gear sets (63) is composed of two synchronous gears distributed in parallel and a synchronous shaft connecting the two synchronous gears in series; and the synchronous shaft is rotatably mounted on the bracket (61); The upper synchronous gears in each synchronous gear set (63) are meshed with the inner ring gear block of the driving gear ring (62), and the lower synchronous gears in each synchronous gear set (63) are meshed and connected with a synchronous frame (64), the synchronous frame (64) is slidably mounted on the bracket (61), and an extension rod (65) extending to the top of the bearing bracket (6) is fixed on the synchronous frame (64), and the extension rod (65) is provided with a vertically distributed positioning roller group (66).

6. The safety valve inspection device according to claim 5, characterized in that: A second driving gear (67) is provided in the interlayer space between the supporting platform (6) and the bracket (61), the second driving gear (67) meshing with the outer ring gear block of the driving gear ring (62), and a driving structure capable of controlling the rotation of the second driving gear (67) is installed on the supporting platform (6).

7. The safety valve testing device according to claim 1, characterized in that: The linkage frame (34) is provided with a first pneumatic assembly (35) and two symmetrically distributed guide rails (36), both ends of the support platform (6) are slidably connected to the guide rails (36), and the output end of the first pneumatic assembly (35) is connected to both ends of the support platform (6).

8. The safety valve testing device according to claim 1, characterized in that: The positioning platform (5) is provided with a sealing gasket (52), and when the safety valve is connected to the positioning platform (5), the sealing gasket (52) is located outside the valve body of the safety valve.

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