Air conditioner compressor assembly testing fixture

Abstract

The invention provides an air conditioner compressor assembly testing fixture, and relates to the technical field of hole measurement, the air conditioner compressor assembly testing fixture comprises a detection table, a positioning assembly, a driving mechanism and a hole diameter detection assembly, two ends of the surface of the detection table are screwed with electric lifting rods, the tops of the electric lifting rods are screwed with a top plate, a fixed plate is welded above the top plate, and one end of the driving mechanism is provided with a motor; a shell part of the motor is fixed to the upper portion of the top plate through screws, a bottom layer sliding hole is formed in the middle of the top plate, each positioning assembly penetrates through the interior of the bottom layer sliding hole, the position of each aperture detection assembly in the initial state can be flexibly adjusted and controlled through the positioning assemblies, and each positioning assembly can be increased or decreased; therefore, the device can be applied to air conditioner compressor assemblies of different specifications and types, the detection process of each hole is completed at the same time during detection, and the detection process can be completed at the same time for the problems of deviation and deformation of the holes and whether protrusions exist on the inner walls or not.

Description

Technical Field

[0001] The invention relates to the technical field of hole measurement, in particular to an air-conditioning compressor assembly inspection tool. Background Art

[0002] After the air-conditioning compressor assembly is produced, it needs to be inspected with a test fixture. The main purpose of the inspection is to ensure the safety and reliability of the product and meet the design and use requirements. Through multiple tests, we can get a preliminary understanding of the performance of the compressor and check whether the design, manufacturing, and assembly of the equipment are reasonable and complete to ensure safety and reliability during normal operation. Among them, the inspection of each fixing hole on the surface of the air-conditioning compressor assembly is an essential inspection item, which is directly related to the firmness and reliability of the subsequent installation.

[0003] In the prior art, the inspection equipment for the air-conditioning compressor assembly requires different tools to detect the hole position, deformation problem, and burr problem when inspecting the holes on the surface of the air-conditioning compressor assembly, resulting in cumbersome steps in the entire inspection process. The hole inspection process of the air-conditioning compressor assembly can be quickly completed by plugging in a fixture, but the different fixtures of this solution can only be applied to air-conditioning compressor assemblies of the same specification, so the applicability is insufficient. Moreover, when inspecting an air-conditioning compressor assembly with multiple holes to be tested, conventional fixture inspection is difficult to quickly and efficiently locate the specific position of the erroneous holes. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an air-conditioning compressor assembly inspection fixture to solve the problems raised in the above-mentioned background technology. The present invention can flexibly adjust the position of each aperture detection component in the initial state through the positioning component, and each positioning component can be increased or decreased, so that it can be applied to air-conditioning compressor assemblies of different specifications and types, and complete the inspection process for each hole at the same time during the inspection, and also realize the simultaneous inspection process of the hole offset, deformation and whether there is a bulge on the inner wall.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: an air-conditioning compressor assembly inspection tool, comprising an inspection tool body, the inspection tool body comprising a detection platform, a positioning component, a driving mechanism and an aperture detection component, electric lifting rods are screwed at both ends of the surface of the detection platform, a top plate is screwed at the top of the electric lifting rod, a fixing plate is welded above the top plate, a motor is installed at one end of the driving mechanism, the outer shell of the motor is fixed to the top of the top plate with screws, a bottom sliding hole is opened in the middle of the top plate, each of the positioning components passes through the inside of the bottom sliding hole, and a transmission mechanism is sleeved at the bottom end of each positioning component, a through hole is opened at the end of the transmission mechanism, a lower hanging rod is inserted in the inside of the through hole, and an aperture detection component is sleeved at the end of the lower hanging rod, a center detection rod and an edge detection rod are inserted at the bottom end of each of the aperture detection components, and the number of the aperture detection components is the same as the number of holes to be measured on the surface of the air-conditioning compressor assembly.

[0006] Furthermore, the driving mechanism includes a motor and a rack, a lead screw is inserted into the output end of the motor, a movable frame is sleeved on the surface of the lead screw, and the rack is integrally formed on the side of the movable frame.

[0007] Furthermore, the bottoms of the movable frame and the rack are pressed against the surface of the top plate, a threaded hole is provided on the surface of the movable frame, the screw rod passes through the inside of the threaded hole, and the screw rod is parallel to the surface of the top plate.

[0008] Furthermore, the positioning assembly includes a center column, a locking plate and a fixed plate, and the surface of the fixed plate is provided with a top sliding hole and a locking groove, and the number of the locking grooves is two and they are symmetrically opened on both sides of the top sliding hole, and the top sliding hole and the bottom sliding hole have the same size specifications and are aligned with each other.

[0009] Furthermore, a locking plate is screwed on the top of the center column, and locking bolts are inserted through the surface of the locking plate. Each locking bolt passes through the inside of the locking groove, and the locking plate is pressed on the surface of the fixed plate. The center column passes downward from the inside of the top sliding hole and the bottom sliding hole in turn.

[0010] Furthermore, the transmission mechanism includes a top ring, a bottom ring, a third gear and an extension plate, the through hole is opened at one end of the extension plate, the side of the top ring is sleeved with a first gear, the bottom of the top ring is welded with a linkage rod, the bottom ring is welded to the bottom end of the linkage rod, and the side of the bottom ring is sleeved with a second gear, and the side of the second gear is sleeved with a toothed belt.

[0011] Furthermore, a third gear is welded to the top of the lower hanging rod, the other end of the toothed belt is sleeved on the side of the third gear, the rack is meshed with the first gear, and the bottom end of the bottom ring is sleeved with a support bearing.

[0012] Furthermore, a locking sleeve is integrally formed at the end of the extension plate, the support bearing is integrally embedded in the interior of the locking sleeve, the center column passes through the top ring, the bottom ring, and the interior of the support bearing in sequence and then is embedded in the interior of the locking sleeve, and screws are inserted into the outside of the locking sleeve.

[0013] Furthermore, the aperture detection assembly includes a center detection rod, an edge detection rod and a pressure detection module. A pressure plate is sleeved on the bottom of the side of the lower hanging rod, the top of the pressure plate is screwed with a pressure detection module, and a notch is opened on one side of the bottom of the pressure plate, and the inner end of the notch is set as a slope.

[0014] Furthermore, the top of the center detection rod is welded to the middle position of the bottom of the pressure plate, and the surfaces of the center detection rod and the edge detection rod are both provided with support sleeves, a connecting plate is integrally formed between the two support sleeves, and a torsion spring is installed at the end of the support sleeve on the center detection rod, and the end of the torsion spring is fixed to the surface of the center detection rod, and the surface of the edge detection rod is integrally formed with a limiting convex ring.

[0015] Beneficial effects of the present invention:

[0016] 1. The air-conditioning compressor assembly inspection fixture can flexibly adjust the position of each aperture detection component in the initial state through the positioning component, so that it can be applied to air-conditioning compressor assemblies of different specifications and types, and the positioning components used can be directly increased or decreased according to the number of holes to be inspected, which is more flexible.

[0017] 2. When the air-conditioning compressor assembly inspection fixture is inspected, each aperture detection component that has completed positioning can be driven to rotate at the same time through the driving mechanism on the top, so that the inspection process is completed during the rotation process, so that each aperture detection component can achieve the inspection purpose synchronously, thereby improving the inspection efficiency.

[0018] 3. The air-conditioning compressor assembly inspection fixture completes the inspection process for each hole at the same time. At the same time, with the help of the center inspection rod and the edge inspection rod at the end of the aperture detection component, the offset, deformation and whether there are bulges on the inner wall of the hole can be inspected at the same time, making the inspection items more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the appearance of an air-conditioning compressor assembly inspection fixture of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the driving mechanism part of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the positioning component part of the present invention;

[0022] Figure 4 The figure is a disassembled diagram of the transmission mechanism of the present invention;

[0023] Figure 5 for Figure 1 A magnified image of area A;

[0024] Figure 6 It is a schematic diagram of the structure of the aperture detection component part of the present invention;

[0025] Figure 7 This is a disassembled diagram of the aperture detection assembly of the present invention;

[0026] In the figure: 1. detection table; 2. electric lifting rod; 3. top plate; 4. driving mechanism; 5. positioning assembly; 6. transmission mechanism; 7. aperture detection assembly; 8. fixing plate; 9. top sliding hole; 10. locking groove; 11. motor; 12. lead screw; 13. moving frame; 14. rack; 15. bottom sliding hole; 16. center column; 17. locking plate; 18. locking bolt; 19. lower hanging rod; 20. top collar; 21. first gear; 22. linkage rod; 23. bottom collar; 24. second gear; 25. third gear; 26. toothed belt; 27. support bearing; 28. extension plate; 29. ​​locking sleeve; 30. through hole; 31. center detection rod; 32. edge detection rod; 33. connecting plate; 34. pressure plate; 35. notch; 36. pressure detection module; 37. support sleeve; 38. torsion spring; 39. limit convex ring. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] See also Figures 1 to 7The present invention provides the following technical solutions: an air-conditioning compressor assembly inspection tool, comprising an inspection tool body, the inspection tool body comprising a detection platform 1, a positioning component 5, a driving mechanism 4 and an aperture detection component 7, the two ends of the surface of the detection platform 1 are screwed with electric lifting rods 2, the top of the electric lifting rod 2 is screwed with a top plate 3, a fixing plate 8 is welded above the top plate 3, a motor 11 is installed at one end of the driving mechanism 4, the outer shell of the motor 11 is fixed on the top of the top plate 3 with screws, and a fixing plate 8 is opened in the middle of the top plate 3. The bottom sliding hole 15, each of the positioning components 5 passes through the inside of the bottom sliding hole 15, and the bottom end of each positioning component 5 is sleeved with a transmission mechanism 6, the end of the transmission mechanism 6 is provided with a through hole 30, the inside of the through hole 30 is inserted with a lower hanging rod 19, the end of the lower hanging rod 19 is sleeved with an aperture detection component 7, the bottom end of each aperture detection component 7 is inserted with a center detection rod 31 and an edge detection rod 32, and the number of the aperture detection components 7 is the same as the number of holes to be tested on the surface of the air-conditioning compressor assembly. The air-conditioning compressor assembly inspection fixture is used to inspect multiple holes opened on the surface of the air-conditioning compressor assembly during the production and processing stage, so as to determine whether the parameters and quality of the holes meet the expected standards.

[0029] When the present invention is used, the number and position of each positioning component 5 are manually controlled according to the standard position of the hole opened on the air-conditioning compressor assembly to be tested. By increasing or decreasing the positioning components 5, the position of each positioning component 5 is moved and the bottom extension plate 28 is rotated to drive the aperture detection component 7 to rotate. After each aperture detection component 7 is aligned with the corresponding hole, the air-conditioning compressor assembly to be tested can be moved to the testing platform 1, and the electric lifting rod 2 is started to pull each positioning component 5 and the aperture detection component 7 downward, and finally the aperture detection component 7 is embedded into the corresponding hole to be tested. Then, the driving mechanism 4 is started, and the transmission mechanism 6 on each positioning component 5 is driven to operate by means of the driving mechanism 4, and then the bottom aperture detection component 7 is pulled by means of the transmission mechanism 6 to rotate inside the hole to be tested, and it is observed whether the internal pressure detection module 36 is triggered in each aperture detection component 7 during the detection process, so as to judge whether the hole to be tested meets the expected standard.

[0030] In this embodiment, the driving mechanism 4 includes a motor 11 and a rack 14. A screw rod 12 is inserted into the output end of the motor 11. A mobile frame 13 is sleeved on the surface of the screw rod 12. The rack 14 is integrally formed on the side of the mobile frame 13. The bottoms of the mobile frame 13 and the rack 14 are pressed against the surface of the top plate 3. A threaded hole is provided on the surface of the mobile frame 13. The screw rod 12 passes through the inside of the threaded hole. The screw rod 12 is parallel to the surface of the top plate 3. The driving mechanism 4 on the top can simultaneously drive each aperture detection component 7 that has completed positioning to rotate, thereby completing the detection process during the rotation process, so that each aperture detection component 7 can achieve the purpose of detection synchronously, thereby improving the detection efficiency.

[0031] Specifically, after starting the motor 11, the rotation of the motor 11 drives the screw rod 12 to rotate, and the screw rod 12 cooperates with the threaded hole on the mobile frame 13 to drive the entire mobile frame 13 and the rack 14 to perform translational movement. When each positioning component 5 is installed, the transmission mechanism 6 mounted on the surface of each positioning component 5 is connected to the rack 14. Therefore, after the rack 14 moves, it can drive the first gear 21 at the top of each transmission mechanism 6 to rotate, thereby finally achieving the purpose of driving the aperture detection component 7 at the end.

[0032] In this embodiment, the positioning assembly 5 includes a center column 16, a locking plate 17 and a fixed plate 8. The surface of the fixed plate 8 is provided with a top sliding hole 9 and a locking groove 10. The number of the locking grooves 10 is two and they are symmetrically provided on both sides of the top sliding hole 9. The top sliding hole 9 and the bottom sliding hole 15 have the same size and are aligned with each other. The top of the center column 16 is screwed with a locking plate 17. The surface of the locking plate 17 is interspersed with locking bolts 18. Each locking bolt 18 passes through the inside of the locking groove 10. The locking plate 17 is pressed on the surface of the fixed plate 8. The center column 16 passes downward from the inside of the top sliding hole 9 and the bottom sliding hole 15 in turn. The positioning assembly 5 can flexibly adjust the position of each aperture detection assembly 7 in the initial state, so that it can be applied to air-conditioning compressor assemblies of different specifications and types. According to the number of holes to be detected as needed, the positioning assembly 5 used can be directly increased or decreased, which is more flexible.

[0033] Specifically, each positioning component 5 passes through the inside of the sliding hole through the center column 16, and is installed on the locking plate 17 using the fixing plate 8, so each center column 16 can slide along the sliding hole, and the bottom extension plate 28 can also directly rotate along the bottom of the center column 16 with the help of the support bearing 27, and finally remember the horizontal movement and the rotation effect of the extension plate 28, and control the position of the terminal aperture detection component 7 on the plane. Relying on this process, the relative position between each aperture detection component 7 is controlled to match the hole position on the air-conditioning compressor assembly to be tested, and then the air-conditioning compressor assembly is placed on the test bench 1, and then the electric lifting rod 2 is started to pull each aperture detection component 7 down, and each aperture detection component 7 is embedded in the corresponding hole to be tested. And after adjusting to the preset position by the positioning component 5. Use the locking bolt 18 to fix the center column 16, and then insert the screw through the surface of the bottom locking sleeve 29 and fix it with the bottom of the center column 16, so as to complete the positioning purpose of the entire extension plate 28 and the position of the terminal aperture detection component 7.

[0034] In this embodiment, the transmission mechanism 6 includes a top collar 20, a bottom collar 23, a third gear 25 and an extension plate 28, the through hole 30 is provided at one end of the extension plate 28, the side of the top collar 20 is sleeved with a first gear 21, the bottom of the top collar 20 is welded with a linkage rod 22, the bottom collar 23 is welded to the bottom end of the linkage rod 22, and the side of the bottom collar 23 is sleeved with a second gear 24, and the side of the second gear 24 is sleeved with a toothed belt 26. The top of the lower hanging rod 19 is welded with a third gear 25, the other end of the toothed belt 26 is sleeved on the side of the third gear 25, the rack 14 is meshed with the first gear 21, and the bottom end of the bottom collar 23 is sleeved with a support bearing 27. A locking sleeve 29 is integrally formed at the end of the extension plate 28, and the support bearing 27 is entirely embedded in the interior of the locking sleeve 29. The center column 16 passes through the top ring 20, the bottom ring 23, and the interior of the support bearing 27 in sequence and then is embedded in the interior of the locking sleeve 29. Screws are inserted into the outer side of the locking sleeve 29.

[0035] Specifically, after the operation of the above-mentioned driving mechanism 4, the top ring 20 is rotated by means of the meshing transmission of the rack 14 and the first gear 21, and the top ring 20 drives the bottom ring 23 and the second gear 24 on the side to rotate by means of the linkage rod 22, and the second gear 24 drives the third gear 25 to rotate by means of the toothed belt 26 sleeved on the surface, and then drives the bottom aperture detection component 7 to rotate through the third gear 25. When the entire transmission mechanism 6 rotates the extension plate 28 in the early stage, due to the supporting effect of the support bearing 27, the rotation of the extension plate 28 can drive the aperture detection component 7 to rotate synchronously, and will not be blocked or restricted by the transmission mechanism 6 itself.

[0036] In this embodiment, the aperture detection assembly 7 includes a center detection rod 31, an edge detection rod 32 and a pressure detection module 36. A pressure plate 34 is sleeved on the bottom of the side of the lower hanging rod 19. The top of the pressure plate 34 is screwed with a pressure detection module 36, and a notch 35 is opened on one side of the bottom of the pressure plate 34. One end of the inside of the notch 35 is set as an inclined surface. The top of the center detection rod 31 is welded to the middle position of the bottom of the pressure plate 34, and the surfaces of the center detection rod 31 and the edge detection rod 32 are sleeved with a support sleeve 37. A connecting plate 33 is integrally formed between the two support sleeves 37, and a torsion spring 38 is installed at the end of the support sleeve 37 on the center detection rod 31. The end of the torsion spring 38 is fixed to the surface of the center detection rod 31, and a limiting convex ring 39 is integrally formed on the surface of the edge detection rod 32. During the inspection, the inspection process is completed for each hole at the same time. With the help of the center inspection rod 31 and the edge inspection rod 32 at the end of the aperture detection component 7, the offset, deformation and whether there are bulges on the inner wall of the hole can be inspected at the same time, making the inspection items more comprehensive.

[0037] Specifically, after the aperture detection assembly 7 is embedded into the hole to be tested through the lifting movement, the driving mechanism 4 is started at this time. With the help of the transmission effect of the above-mentioned transmission mechanism 6, the center detection rod 31 and the edge detection rod 32 at the bottom are rotated. In this process, if the size specification of the hole meets the standard, the edge detection rod 32 can be smoothly rotated around the center detection rod 31 for one circle. If the hole is offset, the center detection rod 31 will not be at the central axis position of the hole, and then the edge detection rod 32 will not be able to rotate for one circle, and will eventually be blocked by the offset inner wall of the hole. If there are protruding impurities on the inner wall of the hole, the edge detection rod 32 will also be blocked. Once the edge detection rod 32 is blocked, it will not be able to rotate synchronously with the center detection rod 31 and the pressure plate 34, and will eventually be offset from the notch 35 at the top and abut against the inclined surface on one side of the notch 35. At this time, the upward abutting force applied to the pressure plate 34 by the edge detection rod 32 can trigger the top pressure detection module 36, and detect that the position cannot rotate smoothly along the inner wall of the hole, thereby locating the wrong hole position. When the aperture detection assembly 7 moves downward, the edge detection rod 32 cannot be inserted into the hole due to the offset of the hole, and the edge detection rod 32 will also pass upward from the support sleeve 37 and press against the pressure plate 34, also triggering the abnormal alarm of the pressure detection module 36.

[0038] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An air-conditioning compressor assembly inspection tool, comprising an inspection tool body, characterized in that: The inspection tool body comprises a detection platform (1), a positioning assembly (5), a driving mechanism (4) and an aperture detection assembly (7). The two ends of the surface of the detection platform (1) are screwed with electric lifting rods (2), the top of the electric lifting rods (2) is screwed with a top plate (3), a fixing plate (8) is welded above the top plate (3), a motor (11) is installed at one end of the driving mechanism (4), the outer shell of the motor (11) is fixed on the top of the top plate (3) by screws, a bottom sliding hole (15) is opened in the middle of the top plate (3), and each of the positioning rods (2) is screwed with a top plate (3) and a fixing plate (8) is welded above the top plate (3). The components (5) all pass through the interior of the bottom sliding hole (15), and the bottom end of each positioning component (5) is sleeved with a transmission mechanism (6), the end of the transmission mechanism (6) is provided with a through hole (30), the interior of the through hole (30) is inserted with a lower hanging rod (19), the end of the lower hanging rod (19) is sleeved with an aperture detection component (7), the bottom end of each aperture detection component (7) is inserted with a center detection rod (31) and an edge detection rod (32), and the number of the aperture detection components (7) is the same as the number of holes to be measured on the surface of the air-conditioning compressor assembly.

2. The air conditioner compressor assembly inspection fixture according to claim 1, characterized in that: The driving mechanism (4) comprises a motor (11) and a rack (14); a lead screw (12) is inserted into the output end of the motor (11); a movable frame (13) is sleeved on the surface of the lead screw (12); and the rack (14) is integrally formed on the side of the movable frame (13).

3. The air-conditioning compressor assembly inspection fixture according to claim 2, characterized in that: The bottoms of the movable frame (13) and the rack (14) are pressed against the surface of the top plate (3); a threaded hole is provided on the surface of the movable frame (13); the screw rod (12) passes through the inside of the threaded hole; and the screw rod (12) is parallel to the surface of the top plate (3).

4. The air conditioner compressor assembly inspection fixture according to claim 2, characterized in that: The positioning assembly (5) comprises a central column (16), a locking plate (17) and a fixing plate (8); a top sliding hole (9) and a locking groove (10) are provided on the surface of the fixing plate (8); the locking grooves (10) are two in number and are symmetrically provided on both sides of the top sliding hole (9); the top sliding hole (9) and the bottom sliding hole (15) have the same size and are aligned with each other.

5. The air conditioner compressor assembly inspection fixture according to claim 4, characterized in that: A locking plate (17) is screwed onto the top of the center column (16), and a locking bolt (18) is inserted into the surface of the locking plate (17). Each of the locking bolts (18) passes through the inside of the locking groove (10), and the locking plate (17) is pressed on the surface of the fixing plate (8). The center column (16) passes downward from the inside of the top sliding hole (9) and the bottom sliding hole (15) in sequence.

6. The air-conditioning compressor assembly inspection fixture according to claim 4, characterized in that: The transmission mechanism (6) comprises a top collar (20), a bottom collar (23), a third gear (25) and an extension plate (28); the through hole (30) is provided at one end of the extension plate (28); a first gear (21) is sleeved on the side of the top collar (20); a linkage rod (22) is welded to the bottom of the top collar (20); the bottom collar (23) is welded to the bottom end of the linkage rod (22); a second gear (24) is sleeved on the side of the bottom collar (23); and a toothed belt (26) is sleeved on the side of the second gear (24).

7. The air-conditioning compressor assembly inspection fixture according to claim 6, characterized in that: A third gear (25) is welded to the top of the lower hanging rod (19), the other end of the toothed belt (26) is sleeved on the side of the third gear (25), the rack (14) is meshed with the first gear (21), and a support bearing (27) is sleeved on the bottom end of the bottom ring (23).

8. The air-conditioning compressor assembly inspection fixture according to claim 7, characterized in that: A locking sleeve (29) is integrally formed at the end of the extension plate (28), and the support bearing (27) is entirely embedded in the interior of the locking sleeve (29). The center column (16) passes through the interior of the top collar (20), the bottom collar (23), and the support bearing (27) in sequence and then is embedded in the interior of the locking sleeve (29), and a screw is inserted into the outer side of the locking sleeve (29).

9. The air-conditioning compressor assembly inspection fixture according to claim 6, characterized in that: The aperture detection assembly (7) comprises a central detection rod (31), an edge detection rod (32) and a pressure detection module (36); a pressure plate (34) is sleeved on the bottom of the side of the lower hanging rod (19); the top of the pressure plate (34) is screwed with the pressure detection module (36); a notch (35) is provided on one side of the bottom of the pressure plate (34); and an inner end of the notch (35) is arranged as an inclined surface.

10. The air-conditioning compressor assembly inspection fixture according to claim 9, characterized in that: The top of the center detection rod (31) is welded to the middle position of the bottom of the pressure plate (34), and the surfaces of the center detection rod (31) and the edge detection rod (32) are both sleeved with support sleeves (37), a connecting plate (33) is integrally formed between the two support sleeves (37), and a torsion spring (38) is installed at the end of the support sleeve (37) on the center detection rod (31), the end of the torsion spring (38) is fixed to the surface of the center detection rod (31), and a limiting convex ring (39) is integrally formed on the surface of the edge detection rod (32).

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