A liner detection device for a gyratory crusher

Abstract

The application relates to the field of strength detection, in particular to a lining plate detection device of a gyratory crusher, which comprises a detection seat, an impact table is slidably arranged at the middle part of the inner side of the detection seat, two shaft seats are symmetrically arranged on the upper end face of the impact table, a conversion shaft is rotationally arranged between the two shaft seats, a rib plate is fixedly arranged at the middle upper end of the conversion shaft, a flat plate is fixedly arranged at the middle lower end of the conversion shaft, a one-way pusher is connected to one end of the conversion shaft, a conversion gear is connected to the end of the one-way pusher, a conversion tooth plate is engaged with the rear part of the conversion gear, the conversion tooth plate is elastically connected with the impact table, a limiting piece is arranged between the other end of the conversion shaft and one of the shaft seats, and the impact piece is connected with the impact table. The application improves the accuracy of the detection result and ensures stable impact on the lining plate during the detection process.

Description

Technical Field

[0001] This invention relates to the field of strength testing, specifically to a liner testing device for a gyratory crusher. Background Technology

[0002] A gyratory crusher is a large cone crusher used in primary crushing operations in mines. It utilizes gyratory motion to crush, split, and bend large materials, offering advantages such as high processing capacity and stable operation. To determine whether the strength of the gyratory crusher's liners meets standards, a testing device is typically used.

[0003] Existing testing devices for liner plate strength testing mostly employ impact testing, and the testing end is a planar structure, thus only capable of planar impact testing of the liner plate. However, during the actual operation of a gyratory crusher, the liner plate needs to continuously withstand the combined impact of stone edges and the plane. Therefore, the single planar impact testing method is inconsistent with the actual working conditions of the liner plate, resulting in inaccurate test results. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a liner detection device for a gyratory crusher.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liner detection device for a gyratory crusher, comprising a detection seat, an impact platform slidably mounted on the inner center of the detection seat, two bearing seats symmetrically extending from the upper end of the impact platform, a conversion shaft rotatably mounted between the two bearing seats, a rib plate fixedly mounted on the upper center of the conversion shaft, a flat plate fixedly mounted on the lower center of the conversion shaft, a one-way pushing member connected to one end of the conversion shaft, a conversion gear connected to the end of the one-way pushing member, a conversion tooth plate meshing with the rear of the conversion gear, the conversion tooth plate being elastically connected to the impact platform, a limiting member provided between the other end of the conversion shaft and one of the bearing seats, a clamping member mounted on the lower inner end face of the detection seat, an impact member mounted on the upper end face of the detection seat, and the impact member being connected to the impact platform.

[0006] Preferably, two guide posts are fixedly installed between the upper and lower inner surfaces of the detection seat, and the two guide posts are respectively located at the two side edges of the detection seat, and the impact table is slidably installed on the outer surface of the guide posts.

[0007] Preferably, the impact component includes a drive shaft rotatably mounted on the upper surface of the detection seat, with pusher frames fixedly mounted at both ends of the drive shaft, and a connecting frame rotatably mounted at the end of the pusher frame, the end of the connecting frame being rotatably connected to the impact table.

[0008] Preferably, a servo motor is fixedly mounted on the upper surface of the detection seat. The servo motor is located above the drive shaft, and the output end of the servo motor is connected to the drive shaft by a belt through a pulley.

[0009] Preferably, the clamping member includes a fixed seat fixedly installed in the middle of the lower inner end face of the detection seat, and pressure seats are provided on both sides of the fixed seat. A limiting post is slidably installed through the lower end of the pressure seat. The end of the limiting post is fixed to the detection seat. A threaded post is screwed through the lower end of the pressure seat. The threaded post is located to the side of the limiting post. The lower end of the threaded post is rotatably connected to the detection seat. The upper end of the fixed seat and the upper end of the pressure seat are both arc-shaped.

[0010] Preferably, a plate base is slidably mounted on the lower part of the conversion toothed plate, the end of the plate base is fixed to the impact table, a claw extends from the rear end of the conversion toothed plate, a limit rod is fixedly mounted through the end of the claw, the plate base is slidably mounted on the outer surface of the limit rod, a rod cap is coaxially fixedly mounted on the lower end of the limit rod, a lifting spring is wound around the outside of the limit rod, and the two ends of the lifting spring are fixed to the claw and the plate base respectively.

[0011] Preferably, the unidirectional pushing component includes a ratchet coaxially fixedly mounted on one end of the conversion shaft, a ring disc coaxially disposed on the side of the ratchet, a disc sleeve coaxially rotatably mounted on the outer surface of the ring disc, the disc sleeve being fixed to the impact table, a bearing rod coaxially fixedly mounted inside the ring disc, a conversion gear coaxially fixedly mounted on the end of the bearing rod, a convex cap rod rotatably mounted through the side of the ring disc, a torsion spring being disposed between the convex cap rod and the ring disc, and a pawl fixedly mounted at the end of the convex cap rod, the end of the pawl being close to the outer surface of the ratchet.

[0012] Preferably, the limiting component includes two hooks symmetrically extending from the upper end of one of the shaft seats. The ends of the two hooks are slidably mounted with limiting posts. A T-shaped locking plate is fixedly installed between the lower ends of the two limiting posts. A locking cap is coaxially fixedly installed at the other end of the conversion shaft. Two V-shaped locking grooves are symmetrically opened on the outer surface of the locking cap. The end of the T-shaped locking plate is inserted into the interior of one of the V-shaped locking grooves. A compression spring is wound around the outside of the limiting post. The two ends of the compression spring are fixed to the T-shaped locking plate and the hooks, respectively. A limiting sleeve is coaxially fixedly installed at the upper end of the limiting post.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. When the impact table moves up and down to impact the liner, during the upward movement of the impact table, the conversion gear plate will abut against the top surface of the detection seat, preventing the conversion gear plate from moving upward. At this time, the impact table continues to move upward, driving the conversion gear to roll on the conversion gear plate. This, through the one-way pusher, drives the conversion shaft to rotate 180 degrees, allowing the ridge plate and flat plate on the conversion shaft to exchange positions. This cycle is repeated, allowing the flat plate and ridge plate to alternately impact the liner, simulating the scenario of the stone's edges and flat surfaces constantly colliding with the liner. This allows the liner to be tested in an actual working state, thereby improving the accuracy of the test results.

[0015] 2. When the conversion shaft starts to rotate, guided by the inclined side of the V-shaped locking groove, the end of the T-shaped locking plate will automatically disengage from the V-shaped locking groove on the lock cap and slide on the outer surface of the lock cap. At the same time, the compression spring deforms. After the conversion shaft has finished rotating, the T-shaped locking plate will be pushed by the deformed compression spring and will be inserted into another V-shaped locking groove to limit the rotation of the conversion shaft. This ensures that the ribs and plates on the conversion shaft can remain vertical after the change of position to impact the liner plate, so as to avoid the phenomenon of weakened impact force due to the tilt of the ribs and plates, thereby ensuring stable impact on the liner plate during the testing process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the impact platform of the present invention;

[0018] Figure 3 This is a schematic diagram of the impact platform of the present invention from another perspective;

[0019] Figure 4 For the present invention Figure 3 Enlarged view of A in the middle;

[0020] Figure 5 For the present invention Figure 3 Enlarged view of B in the middle;

[0021] Figure 6 This is a schematic diagram of the annular disk of the present invention;

[0022] Figure 7 This is a schematic diagram of the conversion tooth plate of the present invention;

[0023] Figure 8 This is a schematic diagram of the conversion shaft of the present invention;

[0024] Figure 9 This is a view showing the use of the present invention;

[0025] Figure 10 For the present invention Figure 9 A magnified view of C.

[0026] The components represented by each number in the attached diagram are listed below: 1. Detection seat; 2. Guide post; 3. Impact table; 4. Connecting frame; 5. Push table frame; 6. Drive shaft; 7. Servo motor; 8. Belt; 9. Converter gear plate; 10. Fixed seat; 11. Hook frame; 12. Shaft seat; 13. Converter shaft; 14. Converter gear; 15. Rib plate; 16. Limiting post; 17. Compression spring; 18. Limiting sleeve; 19. T-shaped locking plate; 20. V-shaped locking groove; 21. Lock cap; 22. Ratchet; 23. Pad; 24. Bearing rod; 25. Ring disc; 26. Disc sleeve; 27. Convex cap rod; 28. Torsion spring; 29. ​​Plate claw; 30. Limiting rod; 31. Lifting spring; 32. Rod cap; 33. Plate seat; 34. Flat plate; 35. Pressure seat; 36. Limiting post; 37. Threaded post; 38. Liner plate. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This invention provides a technical solution: such as Figures 1-10The liner detection device for a gyratory crusher shown includes a detection base 1. An impact table 3 is slidably mounted on the inner center of the detection base 1. The impact table 3 can move up and down to impact and detect the liner 38. Two bearing seats 12 extend symmetrically from the upper end of the impact table 3. A conversion shaft 13 is rotatably mounted between the two bearing seats 12, and the bearing seats 12 bear the load of the conversion shaft 13. A rib plate 15 is fixedly mounted on the upper middle part of the conversion shaft 13, and a flat plate 34 is fixedly mounted on the lower middle part of the conversion shaft 13. The rib plate 15 and the flat plate 34 can collide with the liner 38 for detection. One end of the conversion shaft 13 is connected to a one-way pusher, and the end of the one-way pusher is connected to a conversion gear 14. A conversion toothed plate 9 meshes with the rear part of the conversion gear 14, driving the conversion gear 14 to rotate. The conversion toothed plate 9 is elastically connected to the impact table 3. A limiting component is provided between the other end and one of the shaft seats 12. A clamping component is installed on the lower inner end face of the detection seat 1, and an impact component is installed on the upper end face of the detection seat 1. The impact component is connected to the impact table 3. When the impact table 3 moves up and down to impact the liner 38, the conversion tooth plate 9 will abut against the top surface of the detection seat 1 during the upward movement of the impact table 3, preventing the conversion tooth plate 9 from moving upward. At this time, the impact table 3 continues to move upward to drive the conversion gear 14 to roll on the conversion tooth plate 9. This drives the conversion shaft 13 to rotate 180 degrees through the one-way pusher, allowing the ridge plate 15 and the flat plate 34 on the conversion shaft 13 to exchange positions. This cycle is repeated so that the flat plate 34 and the ridge plate 15 can alternately impact the liner 38 to simulate the scene of the stone's edge and flat surface constantly colliding with the liner 38, thus putting the liner 38 in an actual working state for testing, thereby improving the accuracy of the test results.

[0029] Two guide posts 2 are fixedly installed between the upper and lower inner surfaces of the detection seat 1. The two guide posts 2 are located at the two side edges of the detection seat 1 respectively. The impact table 3 is slidably installed on the outer surface of the guide posts 2. The guide posts 2 serve to allow the impact table 3 to slide.

[0030] The impact component includes a drive shaft 6 rotatably mounted on the upper surface of the detection seat 1. Both ends of the drive shaft 6 are fixedly mounted with push table frames 5. The drive shaft 6 drives the push table frames 5 to rotate. A connecting frame 4 is rotatably mounted on the end of the push table frame 5. The end of the connecting frame 4 is rotatably connected to the impact table 3. The connecting frame 4 pushes the impact table 3.

[0031] A servo motor 7 is fixedly installed on the upper surface of the detection seat 1. The servo motor 7 is located above the drive shaft 6. The output end of the servo motor 7 is connected to the drive shaft 6 by a belt 8 through a pulley. The belt 8 connects the output end of the servo motor 7 and the drive shaft 6 together. The servo motor 7 drives the pusher frame 5 on the drive shaft 6 to rotate through the belt 8, which in turn drives the connecting frame 4 to move, so as to push the impact table 3 to move up and down continuously.

[0032] The clamping component includes a fixed seat 10 fixedly installed in the middle of the lower inner end face of the detection seat 1. Pressure seats 35 are provided on both sides of the fixed seat 10. The pressure seats 35 serve to clamp and fix the liner 38. A limiting post 36 is slidably installed through the lower end of the pressure seat 35. The end of the limiting post 36 is fixed to the detection seat 1, ensuring that the pressure seat 35 does not rotate. A threaded post 37 is screwed through the lower end of the pressure seat 35. The threaded post 37 is located to the side of the limiting post 36 and drives the pressure seat 35 to move up and down. The lower end of the threaded post 37 is rotatably connected to the detection seat 1. The upper ends of the fixed seat 10 and the upper ends of the pressure seat 35 are both arc-shaped, adapting to the curvature of the liner 38 for clamping and fixing. The liner 38 is placed on the fixed seat 10, and the threaded post 37 is rotated to move the pressure seat 35 downwards, thus clamping the liner 38 onto the fixed seat 10 for fixation.

[0033] A plate base 33 is slidably mounted on the lower part of the conversion tooth plate 9. The end of the plate base 33 is fixed to the impact table 3. The plate base 33 serves to guide the conversion tooth plate 9. A claw 29 extends from the rear end of the conversion tooth plate 9. A limit rod 30 is fixedly mounted through the end of the claw 29. The claw 29 serves to connect the limit rod 30. The plate base 33 is slidably mounted on the outer surface of the limit rod 30. A rod cap 32 is coaxially fixedly mounted on the lower end of the limit rod 30. The rod cap 32 serves to limit the reset position of the conversion tooth plate 9. A lifting spring 31 is wound around the outside of the limit rod 30. The two ends of the lifting spring 31 are fixed to the claw 29 and the plate base 33, respectively. The lifting spring 31 serves to move the conversion tooth plate 9 upward and reset it.

[0034] The unidirectional pusher includes a ratchet 22 coaxially fixedly mounted on one end of the conversion shaft 13. A ring disc 25 is coaxially arranged on the side of the ratchet 22. A disc sleeve 26 is coaxially rotatably mounted on the outer surface of the ring disc 25. The disc sleeve 26 serves to support the ring disc 25 and is fixed to the impact table 3. A bearing rod 24 is coaxially fixedly mounted inside the ring disc 25. A conversion gear 14 is coaxially fixedly mounted on the end of the bearing rod 24. The bearing rod 24 serves to support the conversion gear 14. A convex cap rod 27 is rotatably mounted through the side of the ring disc 25. A torsion spring 28 is arranged between the convex cap rod 27 and the ring disc 25. A pawl 23 is fixedly mounted on the end of the convex cap rod 27. The convex cap rod 27 serves to connect the pawl 23. The end of the pawl 23 is close to the outer surface of the ratchet 22. The torsion spring 28 ensures that the pawl 23 is always in contact with the outer surface of the ratchet 22.

[0035] The limiting component includes two hooks 11 symmetrically extending from the upper end of one of the shaft seats 12. Each hook 11 has a slidably mounted limiting post 16 at its end, which supports the limiting post 16. A T-shaped locking plate 19 is fixedly installed between the lower ends of the two limiting posts 16, guiding the T-shaped locking plate 19. A locking cap 21 is coaxially fixedly installed at the other end of the conversion shaft 13. Two V-shaped locking grooves 20 are symmetrically formed on the outer surface of the locking cap 21. The end of the T-shaped locking plate 19 is inserted into one of the V-shaped locking grooves 20. The fit between the V-shaped locking groove 20 and the T-shaped locking plate 19 limits the conversion shaft 13. A compression spring 17 is wound around the outside of the limiting post 16. Both ends of the compression spring 17 are fixed to the T-shaped locking plate 19 and the hooks 11, respectively. The compression spring 17 keeps the end of the T-shaped locking plate 19 and the V-shaped locking plate 19 within the groove. The locking groove 20 serves to engage the upper end of the limiting post 16, which is coaxially fixed with the limiting sleeve 18. The limiting sleeve 18 prevents the limiting post 16 and the hook frame 11 from separating. When the conversion shaft 13 starts to rotate, guided by the inclined side of the V-shaped locking groove 20, the end of the T-shaped locking plate 19 will automatically disengage from the V-shaped locking groove 20 on the locking cap 21 and slide on the outer surface of the locking cap 21. At the same time, the compression spring 17 deforms. After the conversion shaft 13 has rotated, the T-shaped locking plate 19 will engage with another V-shaped locking groove 20 under the push of the deformed compression spring 17 to limit the rotation of the conversion shaft 13. This ensures that the rib plate 15 and the flat plate 34 on the conversion shaft 13 can remain vertical after the change of position to impact the liner plate 38, so as to avoid the phenomenon of weakened impact force due to the tilt of the rib plate 15 and the flat plate 34, thereby ensuring stable impact on the liner plate 38 during the testing process.

[0036] During testing, the liner 38 is placed on the fixed seat 10, and the threaded column 37 is rotated to move the pressure seat 35 downward, pressing the liner 38 firmly onto the fixed seat 10 for fixation. Then, the servo motor 7 drives the pusher frame 5 on the drive shaft 6 via the belt 8, which in turn drives the connecting frame 4 to move, pushing the impact table 3 up and down continuously. When the impact table 3 moves downward, it causes the plate 34 to move downward to impact the liner 38. Subsequently, the impact table 3 moves upward. During this process, the conversion toothed plate 9 abuts against the top surface of the testing seat 1, preventing the conversion toothed plate 9 from moving upward. At this point, the impact... The striking platform 3 continues to move upward, causing the conversion gear 14 to roll on the conversion gear plate 9, thereby driving the bearing rod 24 and the ring disc 25 to rotate. This, in turn, drives the ratchet 22 to rotate via the pawl 23, thus causing the conversion shaft 13 to rotate 180 degrees, allowing the rib plate 15 and the flat plate 34 on the conversion shaft 13 to interchange positions. During this process, when the conversion shaft 13 first begins to rotate, guided by the inclined side of the V-shaped locking groove 20, the end of the T-shaped locking plate 19 will automatically disengage from the V-shaped locking groove 20 on the lock cap 21 and slide on the outer surface of the lock cap 21, simultaneously compressing the spring 17 and causing it to deform. After the conversion shaft 13 has rotated, the T-shaped locking plate 19, pushed by the deformed compression spring 17, will engage in another V-shaped locking groove 20 to limit the rotation of the conversion shaft 13. This ensures that the rib plate 15 and plate 34 on the conversion shaft 13, after being swapped, can remain vertical and impact the liner plate 38. When the rib plate 15 and plate 34 on the conversion shaft 13 are swapped, the impact table 3 moves down again. At this time, the lifting spring 31 pushes the conversion gear plate 9 to move up and reset. The moving conversion gear plate 9 then drives the conversion gear 14 to reverse, thereby driving the bearing rod 2. 4. The ring disc 25 reverses, while the pawl 23 slides on the surface of the ratchet 22, preventing the conversion shaft 13 from reversing. This keeps the ridge plate 15 and the flat plate 34 in their swapped state. At this time, the impact table 3 continues to move downward, causing the ridge plate 15 to move downward and impact the liner plate 38. Then the impact table 3 moves upward again, and so on, allowing the flat plate 34 and the ridge plate 15 to alternately impact the liner plate 38, simulating the scenario where the edges and planes of the stone constantly collide with the liner plate 38. This allows the liner plate 38 to be tested in an actual working state, thereby improving the accuracy of the test results.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liner detection device for a gyratory crusher, comprising a detection base (1), characterized in that: An impact platform (3) is slidably installed in the middle of the inner side of the detection seat (1). Two bearing seats (12) extend symmetrically from the upper end of the impact platform (3). A conversion shaft (13) is rotatably installed between the two bearing seats (12). A rib plate (15) is fixedly installed at the upper middle part of the conversion shaft (13). A flat plate (34) is fixedly installed at the lower middle part of the conversion shaft (13). One end of the conversion shaft (13) is connected to a one-way pusher. The end of the one-way pusher is connected to a conversion gear (14). A conversion gear plate (9) meshes with the rear part of the conversion gear (14). The conversion gear plate (9) is elastically connected to the impact platform (3). A limiter is provided between the other end of the conversion shaft (13) and one of the bearing seats (12). A clamping member is installed on the lower inner end of the detection seat (1). An impact member is installed on the upper end of the detection seat (1). The impact member is connected to the impact platform (3). A plate base (33) is slidably installed on the lower part of the conversion tooth plate (9). The end of the plate base (33) is fixed to the impact table (3). A claw (29) extends from the rear end of the conversion tooth plate (9). A limit rod (30) is fixedly installed through the end of the claw (29). The plate base (33) is slidably installed on the outer surface of the limit rod (30). A rod cap (32) is fixedly installed coaxially at the lower end of the limit rod (30). A lifting spring (31) is wound around the outside of the limit rod (30). The two ends of the lifting spring (31) are fixed to the claw (29) and the plate base (33) respectively. The unidirectional pusher includes a ratchet (22) coaxially fixedly installed at one end of the conversion shaft (13), a ring disc (25) coaxially provided on the side of the ratchet (22), a disc sleeve (26) coaxially rotatably installed on the outer surface of the ring disc (25), the disc sleeve (26) being fixed to the impact table (3), a bearing rod (24) coaxially fixedly installed inside the ring disc (25), the conversion gear (14) being coaxially fixedly installed at the end of the bearing rod (24), a convex cap rod (27) being rotatably installed through the side of the ring disc (25), a torsion spring (28) being provided between the convex cap rod (27) and the ring disc (25), and a pawl (23) being fixedly installed at the end of the convex cap rod (27), the end of the pawl (23) being close to the outer surface of the ratchet (22); The limiting component includes two hooks (11) symmetrically extending from the upper end of one of the shaft seats (12). The ends of the two hooks (11) are slidably mounted with limiting posts (16). A T-shaped locking plate (19) is fixedly installed between the lower ends of the two limiting posts (16). A lock cap (21) is coaxially fixedly installed at the other end of the conversion shaft (13). Two V-shaped locking grooves (20) are symmetrically opened on the outer surface of the lock cap (21). The end of the T-shaped locking plate (19) is inserted into the interior of one of the V-shaped locking grooves (20). A compression spring (17) is wound around the outside of the limiting post (16). The two ends of the compression spring (17) are fixed to the T-shaped locking plate (19) and the hooks (11) respectively. A limiting sleeve (18) is coaxially fixedly installed at the upper end of the limiting post (16).

2. The liner detection device for a gyratory crusher according to claim 1, characterized in that: Two guide posts (2) are fixedly installed between the upper and lower inner surfaces of the detection seat (1). The two guide posts (2) are located at the two side edges of the detection seat (1) respectively. The impact table (3) is slidably installed on the outer surface of the guide posts (2).

3. The liner detection device for a gyratory crusher according to claim 1, characterized in that: The impact component includes a drive shaft (6) rotatably mounted on the upper end face of the detection seat (1). Both ends of the drive shaft (6) are fixedly mounted with push table frames (5). A connecting frame (4) is rotatably mounted on the end of the push table frame (5). The end of the connecting frame (4) is rotatably connected to the impact table (3).

4. The liner detection device for a gyratory crusher according to claim 3, characterized in that: A servo motor (7) is fixedly installed on the upper surface of the detection seat (1). The servo motor (7) is located above the drive shaft (6). The output end of the servo motor (7) is connected to the drive shaft (6) by a belt (8) through a pulley.

5. The liner detection device for a gyratory crusher according to claim 1, characterized in that: The clamping component includes a fixed seat (10) fixedly installed in the middle of the lower inner end face of the detection seat (1). Both sides of the fixed seat (10) are provided with pressure seats (35). A limiting post (36) is slidably installed through the lower end of the pressure seat (35). The end of the limiting post (36) is fixed to the detection seat (1). A threaded post (37) is screwed through the lower end of the pressure seat (35). The threaded post (37) is located on the side of the limiting post (36). The lower end of the threaded post (37) is rotatably connected to the detection seat (1). The upper end of the fixed seat (10) and the upper end of the pressure seat (35) are both arc-shaped.

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