Conveying production line for spring manufacturing

Abstract

The application discloses a kind of conveying production lines for spring manufacturing, belong to spring manufacturing technical field, including the conveying disc playing the role of rotary conveying and the bearing assembly for placing spring, bearing assembly includes multiple pedestals distributed in the top of conveying disc and the compression plate arranged above pedestal, the top of pedestal is fixedly connected with spring insertion column, the top of pedestal is fixedly connected with lower grinding disc, the inside of pedestal is rotatably provided with two symmetrically arranged lifting lead screws.The application is provided with conveying disc, rotary motor, rotary groove body, upper grinding disc and lower grinding disc, which can polish the two ends of the spring during the spring conveying process, reduce the pretreatment operation before spring conveying, indirectly improve the conveying efficiency of spring, and can realize the comprehensive detection function of the surface quality of spring during conveying process without visual inspection by staff, significantly improve the detection efficiency while reducing the workload of staff.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spring manufacturing, in particular to a conveying production line for spring manufacturing. BACKGROUND

[0002] A spring is a mechanical part that works by using elasticity. The part made of elastic material deforms under the action of external force and returns to its original shape after the external force is removed.

[0003] After the spring is manufactured, it needs to be conveyed to the detection point by using the conveying line. Before conveying, the processing personnel need to grind the two ends of the spring for the convenience of subsequent installation of the spring. After the spring is conveyed to the detection point, the detection personnel need to detect the surface quality of the spring, the high-temperature resistance of the spring and other characteristics. The existing conveying line cannot detect part of the spring during the conveying process. It only has a single conveying function, so it cannot screen out part of the unqualified spring before the detection process starts, reducing the workload of subsequent spring detection. Moreover, the spring conveying line cannot polish the two ends of the spring during the conveying process, so it cannot reduce the pretreatment work of the spring before conveying. Therefore, a conveying production line for spring manufacturing is proposed to solve the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problem that the existing spring conveying line cannot detect part of the spring and cannot polish the two ends of the spring. A conveying production line for spring manufacturing is proposed.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A conveying production line for spring manufacturing, comprising a conveying disc for rotating conveying and a bearing assembly for placing springs, the bearing assembly comprising a plurality of bases circumferentially distributed on the top end of the conveying disc and a compression plate arranged above the bases, the top end of the base is fixedly connected with a spring insertion column, the top end of the base is fixedly connected with a lower polishing disc, two symmetrically arranged lifting lead screws are rotatably arranged in the base, a lifting motor connected with the lifting lead screw is installed at the bottom end of the base, a threaded hole is formed in the interior of the compression plate and is threadedly connected with the lifting lead screw, a rotation opening is formed in the center of the compression plate, a rotation groove body is rotatably connected to the inner side of the rotation opening, a plurality of movement through grooves are circumferentially distributed on the bottom end of the rotation groove body, an inner support assembly is arranged on the inner side of the movement through groove, and a rotation tooth ring is fixedly connected to the outer side wall of the rotation groove body.

[0007] A lifting ring is provided between the base and the compression plate. A guide block sleeved on the surface of the lifting screw is fixedly connected to the side wall of the lifting ring. An electromagnetic induction heating coil for heating the spring is provided inside the lifting ring.

[0008] The compression plate has an annular groove at its bottom end. A detection-type pressure sensor is installed on the inner wall of the annular groove. A pressure-bearing ring that moves up and down is slidably connected to the inner wall of the annular groove. An upper grinding disc is fixedly connected to the bottom end of the pressure-bearing ring. A visual inspection ring is connected to the bottom end of the lifting ring through an L-shaped rod.

[0009] Preferably, an indicator light is provided at the top of the conveyor plate near the base, a rotating column is fixedly connected to the bottom of the conveyor plate, a support base is rotatably provided at the bottom of the rotating column, a conveying gear ring is fixedly connected to the surface of the rotating column, a conveying motor is installed at the top of the support base, and a conveying gear that meshes with the conveying gear ring is fixedly connected to the output end of the conveying motor.

[0010] Preferably, the top of the base has a groove, and a photoelectric sensor for measuring the lifting distance of the compression plate is installed inside the groove.

[0011] Preferably, the inner wall of the visual inspection ring has circumferentially distributed inner holes, and a high-temperature resistant camera is installed inside the inner holes.

[0012] Preferably, a rotary motor is installed at the top of the compression plate, and a rotary gear that meshes with a rotary ring gear is fixedly connected to the output end of the rotary motor.

[0013] Preferably, the inner support assembly includes an electric push rod installed on the inner wall of the movable channel and an inner support rod slidably connected to the inner side of the movable channel. One end of the electric push rod is fixedly connected to the inner support rod, and an inner support block is fixedly connected to the side wall of the inner support rod.

[0014] Preferably, the inner support block has mounting grooves on both sides, an avoidance type pressure sensor is installed on the inner wall of the mounting groove, and a protrusion is slidably provided on the inner side of the mounting groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This solution, by setting up a conveyor plate, an inner support assembly, and a visual inspection ring, utilizes the rotation of the spring to make the visual inspection ring spiral upward along the spring surface, which can realize the comprehensive inspection function of the surface quality of the spring during the conveying process, eliminating the need for visual inspection by personnel, significantly improving inspection efficiency while reducing the workload of personnel.

[0017] 2. This solution, by setting up a conveyor plate, a rotary motor, a rotary trough, an upper grinding plate, and a lower grinding plate, can grind both ends of the spring during the spring conveying process, thus eliminating the need for workers to use grinding tools to grind the spring, reducing pre-processing work before spring conveying, and indirectly improving the spring conveying efficiency.

[0018] 3. This solution is equipped with a conveyor plate, a lifting motor, a photoelectric sensor, a lifting ring, and a compression plate. The spring is heated by an electromagnetic induction heating coil inside the lifting ring. The lifting motor drives the compression plate to move down and compress the spring. Then, the compression plate moves up until the spring returns to its original position. By comparing whether the upward and downward distances of the compression plate are the same, it can be determined whether the spring can return to its original position normally after being compressed by heating, thus realizing the function of detecting the high temperature resistance of the spring. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a conveyor production line for spring manufacturing proposed in this invention;

[0020] Figure 2 This is a schematic diagram of the assembly structure of the inner support component, base and compression plate in a spring manufacturing conveyor production line proposed in this invention;

[0021] Figure 3 This is a schematic diagram of the assembly structure of the compression plate and the upper grinding disc in a conveyor production line for spring manufacturing proposed in this invention.

[0022] Figure 4 This is a three-dimensional structural diagram of a vision inspection ring in a conveyor production line for spring manufacturing, as proposed in this invention.

[0023] Figure 5 This is a schematic diagram of the assembly structure of the inner support component in a conveyor production line for spring manufacturing, as proposed in this invention.

[0024] Figure 6 This is a schematic diagram of the assembly structure of the inner support block in a spring manufacturing conveyor production line proposed in this invention;

[0025] Figure 7 This is a schematic cross-sectional view of a lifting ring in a spring manufacturing conveyor production line proposed in this invention.

[0026] Figure 8 This is a schematic diagram of the assembly structure of the conveyor plate and rotating column in a spring manufacturing conveyor production line proposed in this invention.

[0027] In the diagram: 1. Conveyor plate; 2. Base; 3. Lifting ring; 4. Compression plate; 401. Annular groove; 5. Vision inspection ring; 6. Rotating groove; 601. Moving through groove; 7. Rotating gear; 8. Rotary motor; 9. Lifting motor; 10. Lifting screw; 11. Indicator light; 12. Spring insert; 13. Lower grinding disc; 14. Through-beam photoelectric sensor; 15. Upper grinding disc; 16. Pressure bearing ring; 17. Detection type pressure sensor; 18. High temperature resistant camera; 19. Electric push rod; 20. Inner support rod; 21. Inner support block; 2101. Mounting groove; 22. Protrusion; 23. Avoidance type pressure sensor; 24. Conveying gear; 25. Conveying motor; 26. Rotating column; 27. Conveying gear ring; 28. Support seat; 29. ​​Electromagnetic induction heating coil. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example, refer to Figures 1 to 8A spring manufacturing conveyor production line includes a conveyor plate 1 for rotating conveying and a bearing assembly for placing springs. The bearing assembly includes multiple bases 2 circumferentially distributed on the top of the conveyor plate 1 and a compression plate 4 disposed above the bases 2. The compression plate 4 can compress the conveyed springs by moving downward, which facilitates the compression of the springs. A spring insert 12 is fixedly connected to the top of the base 2, and the placed springs are inserted into the spring insert 12, which facilitates the temporary limiting of the springs.

[0032] The bottom of the base 2 is fixedly connected to the lower grinding disc 13. The base 2 has two symmetrically arranged lifting screws 10 inside. The bottom of the base 2 is equipped with a lifting motor 9 connected to the lifting screws 10. The compression plate 4 has a threaded through hole that is threadedly connected to the lifting screws 10 inside.

[0033] It should be noted that the lifting motor 9 drives the lifting screw 10 to rotate. With the cooperation of the threaded through hole inside the compression plate 4 and the lifting screw 10, the lifting and lowering of the compression plate 4 is controlled, which can compress the conveying spring.

[0034] A rotating opening is provided at the center of the compression plate 4. A rotating groove 6 is rotatably connected to the inner side of the rotating opening. A plurality of movable through slots 601 distributed in a circle are provided at the bottom end of the rotating groove 6. An inner support assembly is provided on the inner side of the movable through slot 601. Further, the inner support assembly includes an electric push rod 19 installed on the inner wall of the movable through slot 601 and an inner support rod 20 slidably connected to the inner side of the movable through slot 601. One end of the electric push rod 19 is fixedly connected to the inner support rod 20. An inner support block 21 is fixedly connected to the side wall of the inner support rod 20.

[0035] It should be noted that the electric push rod 19 drives the inner support rod 20 inside the movable through groove 601 to move, which in turn drives the inner support block 21 to move, so that the inner support block 21 can squeeze the inside of the spring to achieve the support and fixation of the spring.

[0036] A lifting ring 3 is provided between the base 2 and the compression plate 4. A guide block sleeved on the surface of the lifting screw 10 is fixedly connected to the side wall of the lifting ring 3. An electromagnetic induction heating coil 29 for heating the spring is provided inside the lifting ring 3. A visual inspection ring 5 is connected to the bottom end of the lifting ring 3 through an L-shaped rod. Furthermore, a circularly distributed inner hole is opened on the inner wall of the visual inspection ring 5, and a high-temperature resistant camera 18 is installed inside the inner hole.

[0037] It should be noted that when the spring is inserted into the spring post 12, the bottom end of the spring passes through the visual inspection ring 5. When the spring rotates, the visual inspection ring 5 moves upward along the surface of the spring in a spiral motion, which in turn drives the lifting ring 3 to move upward through the L-shaped rod. During this process, the spring is electromagnetically heated by the electromagnetic induction heating coil 29 to prepare for the high temperature resistance test of the spring.

[0038] It should be noted that when the visual inspection ring 5 moves spirally upward along the spring surface, the camera on the inner wall of the visual inspection ring 5 can capture images of the spring surface and transmit the image information to the controller. If the controller recognizes that there are defects (cracks, burrs, etc.) on the spring surface in the transmitted image information, the controller will control the indicator light 11 to light up and will not perform subsequent inspection operations.

[0039] An annular groove 401 is provided at the bottom of the compression plate 4. A detection type pressure sensor 17 is installed on the inner wall of the annular groove 401. A pressure bearing ring 16 that moves up and down is slidably connected to the inner wall of the annular groove 401. An upper grinding disc 15 is fixedly connected to the bottom end of the pressure bearing ring 16. Furthermore, a groove is provided at the top of the base 2. A photoelectric sensor 14 for measuring the lifting distance of the compression plate 4 is installed inside the groove.

[0040] It should be noted that when the compression plate 4 compresses the heated spring, the spring will in turn press against the upper grinding disc 15, and then press against the detection pressure sensor 17 through the pressure ring 16. The detection pressure sensor 17 can detect the elastic force value when the spring is compressed a certain distance. When the compression plate 4 resets, if several detection pressure sensors 17 detect that the elastic force value is zero, it means that the spring has been reset. At this time, if the downward distance and upward distance of the compression plate 4 measured by the photoelectric sensor 14 are the same, it means that the length of the spring after reset is the same as that before compression, and the high temperature resistance of the spring is qualified; otherwise, it means that the high temperature resistance of the spring is unqualified.

[0041] Furthermore, an indicator light 11 is provided at the top of the conveyor plate 1 near the base 2. When the indicator light 11 is lit, it indicates that the spring at that location is defective and needs to be returned to the factory for remanufacturing. A rotating column 26 is fixedly connected to the bottom of the conveyor plate 1. A support base 28 is rotatably provided at the bottom of the rotating column 26. A conveying gear ring 27 is fixedly connected to the surface of the rotating column 26. A conveying motor 25 is installed at the top of the support base 28. A conveying gear 24 that meshes with the conveying gear ring 27 is fixedly connected to the output end of the conveying motor 25.

[0042] It should be noted that: the conveyor motor 25 drives the conveyor gear 24 at its output end to rotate intermittently, the conveyor gear 24 drives the conveyor gear ring 27 that meshes with it to rotate intermittently, the conveyor gear ring 27 drives the rotating column 26 at the bottom of the conveyor disk 1 to rotate intermittently, and thus drives the conveyor disk 1 to rotate intermittently, thereby realizing the intermittent conveying function of the spring.

[0043] Furthermore, a rotating gear ring is fixedly connected to the outer wall of the rotating tank 6, and a rotating motor 8 is installed at the top of the compression plate 4. A rotating gear 7 that meshes with the rotating gear ring is fixedly connected to the output end of the rotating motor 8.

[0044] It should be noted that: the rotary motor 8 drives the rotary gear 7 at its output end to rotate, which in turn drives the rotary gear ring meshing with it to rotate. The rotary gear ring drives the rotary groove 6 to rotate. The rotary groove 6 drives the spring to rotate through the internal support assembly. Under the action of the lower grinding disc 13 and the upper grinding disc 15, the two ends of the spring can be ground flat.

[0045] Furthermore, mounting grooves 2101 are provided on both sides of the inner support block 21, and a clearance-type pressure sensor 23 is installed on the inner wall of the mounting groove 2101. A protrusion 22 is slidably provided on the inner side of the mounting groove 2101.

[0046] It should be noted that when the visual inspection ring 5 moves upward along the spring spiral and hits the protrusion 22, the protrusion 22 will squeeze the avoidance pressure sensor 23. The avoidance pressure sensor 23 will feed back to the controller, and the controller will control the electric push rod 19 to work, so that the inner support rod 20 drives the inner support block 21 away from the spring, ensuring that the visual inspection ring 5 can continue to move.

[0047] When using this invention, the operator needs to insert the spring into the spring post 12 on the base 2. The spring post 12 is used to temporarily limit the spring, and at the same time, the bottom end of the spring passes through the visual inspection ring 5. Then, the lifting motor 9 is controlled to drive the lifting screw 10 to rotate clockwise. The lifting screw 10 cooperates with the threaded through hole in the compression plate 4 to make the compression plate 4 move down. The compression plate 4 drives the inner support rod 20 and the inner support block 21 to move down to the inside of the spring. Then, the controller controls the electric push rod 19 to work. The electric push rod 19 drives the inner support rod 20 to move, and then drives the inner support block 21 to move, so that the inner support block 21 squeezes the spring from the inside of the spring, thereby achieving the support and fixation of the spring.

[0048] Then, the controller starts the rotary motor 8, which drives the clockwise rotating gear 7 at its output end to rotate. The rotating gear 7 drives the rotating gear ring meshing with it to rotate counterclockwise. The rotating gear ring drives the rotating groove 6 to rotate. The rotating groove 6 drives the inner support rod 20 and the inner support block 21 to rotate, which in turn drives the spring to rotate counterclockwise. Under the action of the spring's rotation, the visual inspection ring 5 fitted on the spring moves upward along the spring spiral. At the same time, the visual inspection ring 5 drives the lifting ring 3 to move upward through the L-shaped rod. During the process of the visual inspection ring 5 moving along the spring, the high-temperature resistant camera 18 on the inner side of the visual inspection ring 5 can capture images of the spring surface and send the image information to the controller. When the controller identifies defects on the spring surface (cracks, burrs, etc.), the controller will control the indicator light 11 to light up, reminding the staff that the spring is unqualified and needs to be remanufactured. If there are no defects on the spring surface, it means that the spring surface quality is qualified.

[0049] When the visual inspection ring 5 moves upward and approaches the top of the spring, it will contact the protrusion 22 on the inner support block 21. When the visual inspection ring 5 moves upward along the spring spiral and hits the protrusion 22, the protrusion 22 will squeeze the avoidance pressure sensor 23. The avoidance pressure sensor 23 will feed back to the controller, and the controller will control the electric push rod 19 to work, so that the inner support rod 20 will drive the inner support block 21 away from the spring (after the visual inspection ring 5 passes the inner support block 21, the inner support block 21 will reset and squeeze the inner side of the spring again), ensuring that the visual inspection ring 5 can continue to move to the top of the spring, ensuring the comprehensiveness of the visual inspection ring 5 in detecting the spring surface;

[0050] During the upward movement of the lifting ring 3, the electromagnetic induction heating coil 29 inside it can heat the spring. After the visual inspection ring 5 moves to the top of the spring, under the drive of the rotary motor 8, the rotating groove 6 rotates clockwise, which in turn drives the spring to rotate clockwise through the inner support assembly, causing the visual inspection ring 5 to spiral downward. When the visual inspection ring 5 spirals downward, it will contact the protrusion 22 again, so that the inner support block 21 avoids the visual inspection ring 5, ensuring that the visual inspection ring 5 can spiral downward and reset.

[0051] While the visual inspection ring 5 is spirally moving down to reset, the controller will control the lifting motor 9 to work. The lifting motor 9 drives the lifting screw 10 to rotate clockwise, causing the compression plate 4 to move down and compress the spring. When the visual inspection ring 5 is reset, the lifting motor 9 and the rotary motor 8 stop working. At this time, the compression plate 4 no longer moves down to apply pressure to the spring. The photoelectric sensor 14 will record the downward movement distance of the compression plate 4 and upload it to the controller. The detection type pressure sensor 17 will detect the spring force at this time.

[0052] During the compression process of the spring by the compression plate 4, the rotary motor 8 is always in working state, that is, the spring is always in rotating state. During this process, the upper grinding plate 15 contacts the top of the spring and the lower grinding plate 13 contacts the bottom of the spring, realizing the function of grinding both ends of the spring (the heated spring is easier to grind, improving the grinding efficiency of both ends of the spring), thereby reducing the pre-processing work before spring conveying and indirectly improving the conveying efficiency of the spring.

[0053] Afterwards, the controller controls the lifting motor 9 again, causing it to rotate counterclockwise, which moves the compression plate 4 upward. When the detection type pressure sensor 17 detects that the spring force is zero, it means that the compressed spring has been reset. At this time, the photoelectric sensor 14 records the upward movement distance of the compression plate 4 and uploads it to the controller. The controller compares the downward and upward movement distances of the compression plate 4. If the two are the same, it means that the spring can be reset normally after being heated and compressed, indicating that the high temperature resistance of the spring is qualified. Otherwise, it means that the high temperature resistance of the spring is unqualified (the controller will control the indicator light 11 to light up). This realizes the function of detecting the surface quality and high temperature resistance of the spring during the transportation process, which can significantly reduce the subsequent detection items of the spring and further improve the efficiency of subsequent detection of the spring.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A conveyor production line for spring manufacturing, comprising a conveyor plate (1) for rotary conveying and a support assembly for placing springs, characterized in that, The bearing assembly includes multiple bases (2) circumferentially distributed on the top of the conveyor plate (1) and a compression plate (4) set above the bases (2). A spring insert (12) is fixedly connected to the top of the base (2), and a lower grinding plate (13) is fixedly connected to the top of the base (2). Two symmetrically arranged lifting screws (10) are rotatably arranged inside the base (2). A lifting motor (9) connected to the lifting screws (10) is installed at the bottom of the base (2). A threaded through hole connected to the lifting screws (10) is opened inside the compression plate (4). A rotating opening is opened at the center of the compression plate (4). A rotating groove (6) is rotatably connected to the inner side of the rotating opening. Multiple movable through slots (601) circumferentially distributed are opened at the bottom of the rotating groove (6). An inner support assembly is provided on the inner side of the movable through slots (601). A rotating toothed ring is fixedly connected to the outer wall of the rotating groove (6). A lifting ring (3) is provided between the base (2) and the compression plate (4). A guide block sleeved on the surface of the lifting screw (10) is fixedly connected to the side wall of the lifting ring (3). An electromagnetic induction heating coil (29) for heating the spring is provided inside the lifting ring (3). The bottom end of the compression plate (4) is provided with an annular groove (401). A detection type pressure sensor (17) is installed on the inner wall of the annular groove (401). A pressure bearing ring (16) that moves up and down is slidably connected to the inner wall of the annular groove (401). An upper grinding disc (15) is fixedly connected to the bottom end of the pressure bearing ring (16). A visual inspection ring (5) is connected to the bottom end of the lifting ring (3) through an L-shaped rod.

2. The spring manufacturing conveyor production line according to claim 1, characterized in that, An indicator light (11) is provided at the top of the conveyor plate (1) near the base (2). A rotating column (26) is fixedly connected to the bottom of the conveyor plate (1). A support base (28) is rotatably provided at the bottom of the rotating column (26). A conveying gear ring (27) is fixedly connected to the surface of the rotating column (26). A conveying motor (25) is installed at the top of the support base (28). A conveying gear (24) that meshes with the conveying gear ring (27) is fixedly connected to the output end of the conveying motor (25).

3. The spring manufacturing conveyor production line according to claim 1, characterized in that, The top of the base (2) is provided with a groove, and a photoelectric sensor (14) for measuring the lifting distance of the compression plate (4) is installed inside the groove.

4. The spring manufacturing conveyor production line according to claim 1, characterized in that, The visual inspection ring (5) has circumferentially distributed inner holes on its inner wall, and a high-temperature resistant camera (18) is installed inside the inner hole.

5. A conveyor production line for spring manufacturing according to claim 1, characterized in that, A rotary motor (8) is installed at the top of the compression plate (4), and a rotary gear (7) that meshes with a rotary ring gear is fixedly connected to the output end of the rotary motor (8).

6. A conveyor production line for spring manufacturing according to claim 1, characterized in that, The inner support assembly includes an electric push rod (19) installed on the inner wall of the movable channel (601) and an inner support rod (20) slidably connected to the inner side of the movable channel (601). One end of the electric push rod (19) is fixedly connected to the inner support rod (20), and an inner support block (21) is fixedly connected to the side wall of the inner support rod (20).

7. A conveyor production line for spring manufacturing according to claim 6, characterized in that, The inner support block (21) has mounting grooves (2101) on both sides. An avoidance type pressure sensor (23) is installed on the inner wall of the mounting groove (2101). A protrusion (22) is slidably provided on the inner side of the mounting groove (2101).

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