Threaded safety valve verification system

Abstract

A threaded safety valve verification system disclosed by the present invention at least comprises a loading platform and a loading clamp arranged on the loading platform, the loading clamp is used for sealing and connecting a threaded safety valve and connecting a gas source, and the threaded safety valve at least comprises a threaded joint and an outer hexagonal part arranged on the outer wall of the threaded joint. The loading clamp comprises a fixed foundation and a driving device. The fixed foundation comprises a foundation cylinder, an annular middle cavity and the like. The driving device comprises a pressing device, a synchronous rotating device, a jacking device and a bottom sealing assembly; according to the verification system for the threaded safety valve, the loading clamp can realize double sealing of the threaded part and the lower bottom part of the threaded joint of the threaded safety valve, the sealing degree is higher, and the verification result is more accurate; according to the threaded safety valve verification system, the loading clamp is easy to operate, and only the inner hexagonal pipe needs to be rotated.

Description

Technical Field

[0001] The present application relates to the technical field of detection equipment, and in particular to a threaded safety valve calibration system. Background Art

[0002] A threaded safety valve calibration system is a device used to ensure that threaded safety valves operate accurately under specified pressures. Existing calibration equipment consists of at least the following components: a calibration table, a loading fixture, an air source and piping, a sample tray, and a test container of sufficient capacity and a high-precision pressure gauge. This equipment seals the threaded safety valve and provides a stable air source, ultimately enabling accurate pressure measurements via the pressure sensor and data acquisition unit on the calibration table. However, existing threaded safety valve loading fixtures simply seal the threaded joints with raw tape, resulting in poor sealing performance. In some cases, threaded joints may be damaged or leaking, distorting the calibration results. Summary of the Invention

[0003] A threaded safety valve calibration system includes at least a loading platform and a loading fixture provided on the loading platform. The loading fixture is used to seal and connect the threaded safety valve and the air source. The threaded safety valve includes at least a threaded joint and an external hexagonal portion provided on the outer wall of the threaded joint. The loading fixture includes:

[0004] The fixed foundation includes a basic cylinder fixedly connected to the upper end surface of the loading platform, an annular cavity provided inside the basic cylinder, the upper end of the annular cavity is open and an internal threaded tube is formed downwardly, and the lower end surface of the annular cavity is also provided with a bottom through hole, the fixed foundation also includes extruded longitudinal holes uniformly distributed circumferentially on the upper end surface of the basic cylinder, a limiting cross bar provided in the extruded longitudinal hole, an extruded transverse hole provided on the inner side of the lower end surface of the corresponding extruded longitudinal hole, a connecting longitudinal hole provided above the inner side of the corresponding extruded transverse hole and connected to the annular cavity, and a spring stop rod is also provided in the extruded longitudinal hole;

[0005] The active device includes a downward pressing device slidably arranged on a fixed base, a synchronous rotating device rotatably arranged in the downward pressing device for driving the threaded safety valve to rotate downward, a lifting device arranged in the fixed base, and a bottom seal assembly arranged in the annular middle cavity for sealing the threaded safety valve;

[0006] The pressing device includes a disc base, a driving ring groove formed in the disc base, an upper ring groove hole formed at the upper end of the driving ring groove, a lower ring groove hole formed at the lower end surface of the driving ring groove, an extrusion longitudinal rod uniformly distributed circumferentially on the lower end surface of the disc base, and a limiting transverse hole formed in the extrusion longitudinal rod and matched with the limiting transverse rod. The outer edge of the lower end surface of the driving ring groove is provided with a tapered inclined surface that is wider at the top and narrower at the bottom. Upper rollers are uniformly distributed circumferentially on the tapered inclined surface. The lower end of the upper ring gear is provided with a tapered end portion that matches the tapered inclined surface.

[0007] The synchronous rotation device includes a rotating circular tube rotatably arranged in the upper hole of the ring groove, an inner hexagonal tube arranged above the rotating circular tube, a stop convex ring arranged on the inner wall of the rotating circular tube, an upper ring gear arranged below the rotating circular tube and rotatably arranged in the driving ring groove, and the synchronous rotation device also includes upper pinions uniformly distributed circumferentially in the driving ring groove and located below the rotating circular tube, a transmission connecting rod arranged below the upper pinion and passing through the lower end surface of the driving ring groove, and a lower pinion arranged below the upper pinion, wherein the upper pinion is transmission-connected to the upper ring gear;

[0008] The jacking device corresponds to the connecting assembly one by one, and the jacking device includes a transmission cross bar slidably arranged in the corresponding extrusion cross hole, a first inclined surface arranged on the outside of the transmission cross bar and abutting the lower end of the extrusion longitudinal bar, a second inclined surface arranged on the inside of the transmission cross bar, a sliding plug slidably inserted in the corresponding connecting assembly, a spring side hole arranged on the inside of the sliding plug and accommodating the spring stop rod, and a compression spring arranged in the spring side hole and below the spring stop rod, and the lower end surface of the sliding plug is provided with a pressure inclined surface that cooperates with the second inclined surface;

[0009] The bottom seal assembly includes an air inlet cannula rotatably and slidably arranged in the bottom through hole, an annular upper plate arranged on the upper edge of the air inlet cannula and located in the annular middle cavity, a sealing ring base arranged above the annular upper plate, a sealing ring body arranged in the sealing ring base, and a lower annular gear arranged on the outer edge of the upper end surface of the annular upper plate and meshing with the lower pinion gear. The upper edge of the sealing ring body is higher than the upper edge of the sealing ring base. The transmission ratio of the upper annular gear to the lower annular gear is:

[0010] Furthermore, the inner wall of the inner hexagonal tube is formed into a regular hexagon that is plugged into the outer hexagonal portion, and the outer wall of the inner hexagonal tube is also formed into a regular hexagon.

[0011] As a further embodiment, the sliding block is provided with a bottom roller that cooperates with the annular upper plate.

[0012] Beneficial effects:

[0013] The threaded safety valve calibration system described in this case has a loading fixture that can achieve double sealing of the threaded part and the lower bottom of the threaded joint of the threaded safety valve, thereby achieving a higher sealing degree and more accurate calibration results.

[0014] The threaded safety valve calibration system described in this case has a loading fixture that is easy to operate. It only requires rotating the hexagonal tube to drive the threaded safety valve to rotate downward, and the bottom seal assembly can be rotated upward through a synchronous rotation device and a jacking device, so that the sealing ring body and the lower bottom of the threaded joint remain relatively stationary in terms of rotational freedom while approaching each other in the axial direction, axially squeezing the sealing ring body to achieve sealing of the lower end of the threaded joint, and the threaded part of the threaded joint can be sealed by means of winding with raw tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of an embodiment of the threaded safety valve calibration system.

[0017] Figure 2 Schematic diagram of an embodiment of the threaded safety valve.

[0018] Figure 3 is a schematic diagram of an embodiment of the loading fixture.

[0019] Figure 4 is a cross-sectional view of the first embodiment of the loading fixture.

[0020] Figure 5 is a cross-sectional view of a second embodiment of the loading fixture.

[0021] Figure 6 is a cross-sectional view of a third embodiment of the loading fixture.

[0022] Figure 7 It is a cross-sectional view of an embodiment of the fixed foundation.

[0023] Figure 8 It is a cross-sectional view of an embodiment of the active device.

[0024] Figure 9 yes Figure 5 Enlarged schematic diagram of part A in the middle.

[0025] Figure 10 yes Figure 6 Enlarged schematic diagram of part B in the middle.

[0026] In the picture:

[0027] 9. Loading platform;

[0028] 8. Loading fixture;

[0029] 7. Threaded safety valve, 71. Threaded joint, 72. External hexagonal portion;

[0030] 1. Fixed foundation, 11. Base cylinder, 12. Ring-shaped gun, 13. Internally threaded tube, 14. Bottom through hole, 15. Extruded vertical hole, 16. Limiting cross bar, 17. Extruded horizontal hole, 18. Connecting vertical hole, 19. Spring stop rod;

[0031] 2. Active device:

[0032] 21. Down-pressing device, 211. Disc base, 212. Driving ring groove, 213. Ring groove upper hole, 214. Ring groove lower hole, 215. Extrusion longitudinal rod, 216. Limiting horizontal hole, 217. Upper roller;

[0033] 22. Synchronous rotation device, 221. Rotating circular tube, 222. Hexagonal inner tube, 223. Stop convex ring, 224. Upper ring gear, 225. Upper pinion, 226. Transmission connecting rod, 227. Lower pinion;

[0034] 23. Lifting device, 231. Transmission crossbar, 232. First inclined surface, 233. Second inclined surface, 234. Sliding insert, 235. Spring side hole, 236. Compression spring, 237. Compressed inclined surface;

[0035] 24. Bottom seal assembly, 241. Air inlet cannula, 242. Annular upper plate, 243. Sealing ring base, 244. Sealing ring body, 245. Lower ring gear. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0037] A threaded safety valve calibration system includes at least a loading platform 9 and a loading fixture 8 provided on the loading platform 9. The loading fixture 8 is used to seal and connect a threaded safety valve 7 and an air source. The threaded safety valve 7 includes at least a threaded joint 71 and an external hexagonal portion 72 provided on the outer wall of the threaded joint 71. The loading fixture 8 includes:

[0038] The fixed foundation 1 includes a base cylinder 11 fixedly connected to the upper end surface of the loading platform 9, an annular cavity 12 provided inside the base cylinder 11, the upper end of the annular cavity 12 is open and has an internal threaded tube 13 formed downwardly, and the lower end surface of the annular cavity 12 is also provided with a bottom through hole 14, the fixed foundation 1 also includes extruded longitudinal holes 15 uniformly distributed circumferentially on the upper end surface of the base cylinder 11, a limiting cross bar 16 provided in the extruded longitudinal hole 15, an extruded transverse hole 17 provided on the inner side of the lower end surface of the corresponding extruded longitudinal hole 15, and a connecting longitudinal hole 18 provided above the inner side of the corresponding extruded transverse hole 17 and communicating with the annular cavity 12, and a spring stop rod 19 is also provided in the extruded longitudinal hole 15;

[0039] The active device 2 includes a pressing device 21 slidably disposed on the fixed base 1, a synchronous rotation device 22 rotatably disposed in the pressing device 21 for driving the threaded safety valve 7 to rotate downward, a lifting device 23 disposed in the fixed base 1, and a bottom seal assembly 24 disposed in the annular middle cavity 12 for sealing the threaded safety valve 7;

[0040] The pressing device 21 includes a disc base 211, a driving ring groove 212 formed in the disc base 211, an upper ring groove hole 213 formed at the upper end of the driving ring groove 212, a lower ring groove hole 214 formed at the lower end surface of the driving ring groove 212, extrusion longitudinal rods 215 uniformly distributed circumferentially on the lower end surface of the disc base 211, and a limiting transverse hole 216 formed in the extrusion longitudinal rod 215 and cooperating with the limiting transverse rod 18. The outer edge of the lower end surface of the driving ring groove 212 is provided with a tapered inclined surface that is wider at the top and narrower at the bottom. Upper rollers 217 are uniformly distributed circumferentially on the tapered inclined surface. The lower end of the upper ring gear 224 is provided with a tapered end portion that cooperates with the tapered inclined surface.

[0041] The synchronous rotation device 22 includes a rotating circular tube 221 rotatably arranged in the upper hole 213 of the ring groove, an inner hexagonal tube 222 arranged above the rotating circular tube 221, a stopping convex ring 223 arranged on the inner wall of the rotating circular tube 221, and an upper ring gear 224 arranged below the rotating circular tube 221 and rotatably arranged in the driving ring groove 212. The synchronous rotation device 22 also includes upper pinions 225 circumferentially uniformly distributed in the driving ring groove 212 below the rotating circular tube 221, a transmission connecting rod 226 arranged below the upper pinion 225 and passing through the lower end surface of the driving ring groove 212, and a lower pinion 227 arranged below the upper pinion 225. The upper pinion 225 is transmission-connected to the upper ring gear 224.

[0042] The jacking device 23 corresponds to the connecting assembly 17 one by one, and the jacking device 23 includes a transmission cross bar 231 slidably provided in the corresponding extrusion cross hole 17, a first inclined surface 232 provided on the outside of the transmission cross bar 231 and abutting against the lower end of the extrusion longitudinal rod 215, a second inclined surface 233 provided on the inside of the transmission cross bar 231, a sliding plug 234 slidably inserted in the corresponding connecting assembly 17, a spring side hole 235 provided on the inside of the sliding plug 234 and accommodating the spring stop rod 18, and a compression spring 236 provided in the spring side hole 235 and located below the spring stop rod 18. The lower end surface of the sliding plug 234 is provided with a pressure inclined surface 237 that cooperates with the second inclined surface 233;

[0043] The bottom seal assembly 24 includes an air inlet cannula 241 rotatably and slidably disposed within the bottom through hole 14, an annular upper plate 242 disposed on the upper edge of the air inlet cannula 241 and located within the annular central cavity 12, a sealing ring base 243 disposed above the annular upper plate 242, a sealing ring body 244 disposed within the sealing ring base 243, and a lower annular gear 245 disposed on the outer edge of the upper end surface of the annular upper plate 242 and meshing with the lower pinion 227. The upper edge of the sealing ring body 244 is higher than the upper edge of the sealing ring base 243, and the transmission ratio between the upper annular gear 224 and the lower annular gear 245 is 1:1.

[0044] Furthermore, the inner wall of the inner hexagonal tube 222 is formed into a regular hexagon that is plugged into the outer hexagonal portion 72 , and the outer wall of the inner hexagonal tube 222 is also formed into a regular hexagon.

[0045] As a further embodiment, the sliding block 234 is provided with a bottom roller that cooperates with the annular upper plate 242 .

[0046] The threaded safety valve calibration system described in this case has a loading fixture 8 that can double-seal and fix the threaded safety valve 7, and double-seal the threaded portion and bottom of the threaded joint 71 of the threaded safety valve 8:

[0047] S1, downward rotation of the threaded joint 71:

[0048] Place the threaded safety valve 7 into the synchronous rotation device 22, with the threaded joint 71 passing through the stop convex ring 223 and the lower hole 214 of the ring groove, and the outer hexagonal portion 72 placed into the inner hexagonal tube 222;

[0049] Rotate the inner hexagonal tube 222 and the round tube 221 to drive the outer hexagonal portion 72 and the threaded joint 71 to rotate. Since the threaded joint 71 is engaged with the inner threaded tube 13, the threaded joint 71 rotates and moves downward.

[0050] As the instruction manual Figure 4 、 5 As shown:

[0051] After the outer hexagonal portion 72 abuts against the stop convex ring 223, the threaded joint 71 and the outer hexagonal portion 72 drive the inner hexagonal tube 222 to rotate and move downward, and drive the pressing device 21 downward;

[0052] S2, the bottom seal assembly 24 rotates upward:

[0053] S2.1, bottom seal assembly 24 and threaded joint 71 rotate synchronously:

[0054] The upper ring gear 224 rotates to drive the upper pinion 225, the transmission connecting rod 226, and the lower pinion 227 to rotate. The lower pinion 227 rotates to drive the lower ring gear 245, the annular upper plate 242, and the air inlet cannula 241 to rotate. The bottom seal assembly 24 rotates synchronously with the threaded safety valve 7.

[0055] S2.2, bottom seal assembly 24 upward:

[0056] As the instruction manual Figure 6 As shown:

[0057] In S1, the pressing device 21 moves downward, and the extrusion longitudinal rod 215 squeezes the first inclined surface 232, the transmission crossbar 231, and the second inclined surface 233 to move inward. The second inclined surface 233 acts on the pressure inclined surface 237, causing the sliding block 234 to overcome the damping of the compression spring 236 and move upward. The sliding block 234 drives the bottom seal assembly 24 upward.

[0058] Finally, the bottom seal assembly 24 and the threaded safety valve 7 rotate synchronously and approach each other until the sealing ring body 244 is sealed and connected to the bottom of the threaded joint 71.

[0059] Because the sealing ring body 244 rotates synchronously with the threaded safety valve 7 without generating relative displacement, the problem of the threaded joint 71 failing to seal the bottom during the threaded connection process is resolved. Furthermore, by utilizing existing technology, a raw tape is wrapped around the outer wall of the threaded joint 71 to seal the threaded joint and the internally threaded tube 13, ultimately achieving a more effective sealing effect on the threaded safety valve. Air is then ventilated through the air inlet cannula 241, thereby verifying the calibrated pressure of the threaded safety valve 7.

Claims

1. A threaded safety valve inspection system, comprising at least a loading platform (9) and a loading fixture (8) disposed on the loading platform (9), wherein the loading fixture (8) is used to seal and connect a threaded safety valve (7) and to connect an air source, wherein the threaded safety valve (7) comprises at least a threaded joint (71) and an outer hexagonal portion (72) disposed on an outer wall of the threaded joint (71), characterized in that: The loading fixture (8) comprises: A fixed foundation (1) comprises a base cylinder (11) fixedly connected to the upper end surface of a loading platform (9), an annular middle cavity (12) arranged inside the base cylinder (11), the upper end of the annular middle cavity (12) is open and has an internally threaded tube (13) formed downwardly, and the lower end surface of the annular middle cavity (12) is also provided with a bottom through hole (14), the fixed foundation (1) also comprises extrusion longitudinal holes (15) uniformly distributed circumferentially on the upper end surface of the base cylinder (11), a limiting cross bar (16) arranged in the extrusion longitudinal hole (15), an extrusion transverse hole (17) arranged on the inner side of the lower end surface of the corresponding extrusion longitudinal hole (15), and a connecting longitudinal hole (18) arranged above the inner side of the corresponding extrusion transverse hole (17) and connected to the annular middle cavity (12), and a spring stopper (19) is also provided in the extrusion longitudinal hole (15); The active device (2) comprises a pressing device (21) slidably disposed on a fixed base (1), a synchronous rotating device (22) rotatably disposed in the pressing device (21) for driving the threaded safety valve (7) to rotate downward, a lifting device (23) disposed in the fixed base (1), and a bottom sealing assembly (24) disposed in the annular middle cavity (12) for sealing the threaded safety valve (7).

2. A threaded safety valve calibration system according to claim 1, characterized in that: The pressing device (21) comprises a disc base (211), a driving annular groove (212) formed in the disc base (211), an annular groove upper hole (213) formed at the upper end of the driving annular groove (212), an annular groove lower hole (214) formed at the lower end surface of the driving annular groove (212), extrusion longitudinal rods (215) uniformly distributed circumferentially on the lower end surface of the disc base (211), and a limiting transverse hole (216) formed in the extrusion longitudinal rod (215) and cooperating with the limiting transverse rod (18); The synchronous rotation device (22) comprises a rotating circular tube (221) rotatably arranged in an upper hole (213) of the annular groove, an inner hexagonal tube (222) arranged above the rotating circular tube (221), a stop convex ring (223) arranged on the inner wall of the rotating circular tube (221), and an upper ring gear (224) arranged below the rotating circular tube (221) and rotatably arranged in the driving annular groove (212). The synchronous rotation device (22) also comprises upper pinions (225) uniformly distributed in the circumferential direction in the driving annular groove (212) and located below the rotating circular tube (221), a transmission connecting rod (226) arranged below the upper pinion (225) and passing through the lower end surface of the driving annular groove (212), and a lower pinion (227) arranged below the upper pinion (225), wherein the upper pinion (225) is drivingly connected to the upper ring gear (224); The lifting device (23) corresponds to the connecting assembly (17) one by one, and comprises a transmission cross bar (231) slidably arranged in the corresponding extrusion cross hole (17), a first inclined surface (232) arranged on the outside of the transmission cross bar (231) and abutting against the lower end of the extrusion longitudinal rod (215), a second inclined surface (233) arranged on the inside of the transmission cross bar (231), a sliding block (234) slidably inserted in the corresponding connecting assembly (17), a spring side hole (235) arranged on the inside of the sliding block (234) and accommodating the spring stop rod (18), and a compression spring (236) arranged in the spring side hole (235) and located below the spring stop rod (18); The bottom seal assembly (24) comprises an air inlet pipe (241) rotatably and slidably disposed in the bottom through hole (14), an annular upper plate (242) disposed on the upper edge of the air inlet pipe (241) and located in the annular middle cavity (12), a sealing ring base (243) disposed above the annular upper plate (242), a sealing ring body (244) disposed in the sealing ring base (243), and a lower annular gear (245) disposed on the outer edge of the upper end surface of the annular upper plate (242) and meshing with a lower pinion gear (227).

3. A threaded safety valve calibration system according to claim 2, characterized in that: The outer edge of the lower end surface of the driving ring groove (212) is provided with a tapered inclined surface that is wider at the top and narrower at the bottom. Upper rollers (217) are evenly distributed circumferentially on the tapered inclined surface. The lower end of the upper ring gear (224) is provided with a tapered end portion that matches the tapered inclined surface.

4. A threaded safety valve calibration system according to claim 3, characterized in that: The lower end surface of the sliding insert block (234) is provided with a pressure-bearing inclined surface (237) that cooperates with the second inclined surface (233).

5. A threaded safety valve calibration system according to claim 4, characterized in that: The upper edge of the sealing ring body (244) is higher than the upper edge of the sealing ring base (243).

6. A threaded safety valve calibration system according to claim 5, characterized in that: The transmission ratio between the upper ring gear (224) and the lower ring gear (245) is 1:

1.

7. A threaded safety valve calibration system according to claim 6, characterized in that: The inner wall of the inner hexagonal tube (222) is formed into a regular hexagon that is plugged into and matched with the outer hexagonal portion (72), and the outer wall of the inner hexagonal tube (222) is also formed into a regular hexagon.

8. A threaded safety valve calibration system according to claim 7, characterized in that: The sliding insert (234) is provided with a bottom roller that cooperates with the annular upper plate (242).

Images