A surface treatment apparatus for cemented carbide rods

Abstract

The application discloses a cemented carbide rod surface treatment equipment and relates to the alloy rod processing technical field.The equipment body is provided with a supporting plate fixedly connected to the top surface of the equipment body, a through groove is formed in the top surface of the supporting plate, a moving plate is arranged on the both sides of the top surface of the equipment body, a plug rod is inserted into the middle part of the moving plate, a butt joint is fixedly connected to one end of the plug rod, a sleeve ring is fixedly connected to the other end of the plug rod, a first spring is sleeved on the plug rod, and the both ends of the first spring are fixedly connected with one side of the moving plate and one side of the sleeve ring respectively.The application has the advantages of reasonable structure, convenient movement of the butt joint to the both ends of the rod through the adjusting assembly, fixation of the both ends of the rod through the fastening assembly on the moving plate, application to the fixation of rods with different sizes, and uniform polishing of the rod surface through the machining assembly.

Description

Technical Field

[0001] This invention relates to the field of alloy bar processing technology, and in particular to a surface treatment device for cemented carbide bars. Background Technology

[0002] Carbide bars, with their high hardness and strong wear resistance, are widely used in cutting tools, precision machining, and drilling. However, conventionally sintered bars are prone to surface defects such as scratches, microcracks, and excessive roughness, resulting in insufficient corrosion resistance and high-temperature resistance. Traditional surface treatment processes are limited and easily cause surface damage, making it difficult to meet the demands of high-strength, long-life precision applications.

[0003] Patent CN121199777A discloses an intelligent surface treatment device for cemented carbide bars, including a machine base and telescopic devices. The telescopic devices are arranged on both sides of the machine base, and motors are fixedly installed on the surfaces of the telescopic devices on both sides. Clamping plates are fixedly installed on the output ends of the motors on both sides. The motors and telescopic devices are electrically connected to the machine base, and the machine base is connected to a power source. Several telescopic rods are arranged on the surface of the machine base. An elastic element is arranged between the fixed end and the free end of each telescopic rod. Notches are opened on the surfaces of the free end and the output end of each telescopic rod. An arc plate is fixedly installed on the free end of each telescopic rod. By setting the arc plate, the cemented carbide metal bars do not need to be fixed by drilling holes on both sides, reducing processing steps, avoiding damage to the integrity of the bars, and eliminating the need for additional side treatment of the ground bars, greatly improving processing efficiency and reducing material loss.

[0004] There are still some problems in the processing of alloy bars.

[0005] Alloy bars are widely used in industries such as machining and mold manufacturing. During production and processing, their outer surface needs to be ground to remove burrs, oxide layers and optimize surface precision. Currently, conventional grinding equipment has a fixed structure and the position of the fastening structure cannot be flexibly adjusted. It can only be used for bars of a single specification, which is not very versatile. The operation of clamping and fixing the bars is cumbersome and it is difficult to quickly and stably clamp both ends of alloy bars of different lengths and diameters, which limits the processing range. At the same time, the grinding stroke of traditional equipment is limited, and it is not possible to grind the bar surface evenly and repeatedly, which easily leads to uneven grinding and poor processing quality. It cannot meet the needs of batch surface treatment of diverse bars. Summary of the Invention

[0006] The purpose of this application is to provide a surface treatment device for cemented carbide bars, which enables the adjustment components to easily move the joint to both ends of the bar, and then fixes both ends of the bar by the fastening components on the moving plate. It is suitable for fixing bars of different sizes, and finally performs back-and-forth uniform grinding on the surface of the bar by the processing components.

[0007] To achieve the above objectives, this application provides the following technical solution: a surface treatment device for cemented carbide bars, comprising a device body, a support plate fixedly connected to the top surface of the device body, through slots formed on both sides of the top surface of the support plate, movable plates arranged on both sides of the top surface of the device body, an insert rod inserted into the middle of the movable plate, a butt joint fixedly connected to one end of the insert rod, a collar fixedly connected to the other end of the insert rod, a first spring sleeved on the insert rod, and the two ends of the first spring fixedly connected to one side of the movable plate and one side of the collar, respectively;

[0008] It also includes an adjustment component, a fastening component, and a processing component. The adjustment component is disposed on the support plate for positioning both ends of the bar. The fastening component is disposed on the movable plate for fixing both ends of the bar. The processing component is disposed on the support plate for treating the surface of the bar.

[0009] Preferably, the adjusting assembly includes a docking plate fixedly installed at the center of the bottom surface of the movable plate. The bottom end of the docking plate extends to the bottom surface of the support plate through a through groove. A horizontal plate is fixedly connected to the bottom end of the docking plate. The two ends of the horizontal plate are slidably connected to a slide rod. A first shaft seat is fixedly connected to the bottom end of the slide rod. The top end of the first shaft seat is fixedly connected to the support plate.

[0010] Preferably, a side seat is fixedly connected to the middle of one side of the horizontal plate, a rod is fixedly connected to the side seat, and a linkage plate is rotatably connected to the bottom end of the rod.

[0011] Preferably, the other end of the linkage plate is rotatably connected to the turntable, the turntable is fixedly connected to the bottom end of the main shaft, the top end of the main shaft is fixedly connected to the output end of the first motor, and the first motor is fixedly installed at the middle position of the bottom surface of the pallet.

[0012] Preferably, the fastening assembly includes a pair of shafts fixedly mounted on the movable plate, a geared disc fixedly connected to the pair of shafts, the geared discs meshing with each other, a side plate fixedly connected to the pair of shafts, and a clamping block fixedly mounted on the side plate.

[0013] Preferably, a first hinge seat is fixedly connected to the outer surface of one of the side plates, a push plate is rotatably connected to the first hinge seat, the other end of the push plate is rotatably connected to a second hinge seat, an mounting plate is fixedly installed on the movable plate, a cylinder is fixedly installed on the mounting plate, and the telescopic end of the cylinder is fixedly connected to the second hinge seat.

[0014] Preferably, the processing component includes a pair of second shaft seats fixedly mounted on the equipment body, a threaded rod rotatably connected between the pair of second shaft seats, one end of the threaded rod being fixedly connected to the output end of a second motor, and the second motor being fixedly mounted on one of the second shaft seats.

[0015] Preferably, a sleeve is threadedly connected to the threaded rod, the top end of the sleeve is fixedly connected to the mating seat, the mating seat is fixedly installed on the slider, the slider is slidably connected to the slide rail, the slide rail is fixedly installed on the rear side of the support plate, a rotating rod is rotatably connected to the mating seat, one end of the rotating rod is fixedly connected to the output end of the third motor, and the third motor is fixedly installed on the mating seat.

[0016] Preferably, a frame is fixedly connected to the rotating rod, and a pair of base plates are fixedly connected to the frame. The bottom ends of the pair of base plates are fixedly connected to the middle position of the support. Pulleys are rotatably connected to both ends of the support. One end of one of the pulleys is fixedly connected to the output end of the fourth motor. The fourth motor is fixedly mounted on the support.

[0017] Preferably, a grinding belt is fitted onto the pulley, the bottom end of the grinding belt is attached to the driven wheel, the driven wheel is rotatably connected to the arm plate, the top end of the arm plate is fixedly connected to the limiting rod, the limiting rod is rotatably connected to the bracket, one end of the limiting rod is fixedly connected to a retaining ring, a second spring is fitted onto the retaining ring, and the two ends of the second spring are fixedly connected to one side of the retaining ring and one side of the bracket, respectively.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. The present invention has a reasonable structure. When fixing bars of different sizes, the first motor operates to rotate the main shaft. The rotation of the main shaft drives the turntable to rotate. The rotation of the turntable pulls the side seat on the bar through the linkage plate to move the side seat. The side seat is fixedly connected to the horizontal plate. The movement of the side seat causes the two ends of the horizontal plate to slide on the slide rod, thereby facilitating the movement of the moving plate and making it convenient to position the bar.

[0020] 2. In this invention, when the connector is engaged in the holes at both ends of the bar, the cylinder on the mounting plate operates to push the second hinge seat. A push plate is rotatably connected to the second hinge seat, and the other end of the push plate is rotatably connected to the first hinge seat. The movement of the second hinge seat causes the side plate on the first hinge seat to rotate through the push plate. The movement of the side plate causes the gear on the shaft to drive the other side plate to rotate, thereby facilitating the clamping block to clamp the two ends of the bar.

[0021] 3. In this invention, the operation of the second motor causes the threaded rod to rotate, which in turn causes the mating seat on the sleeve block to move, thus facilitating the sliding of the slider on the slide rail. The operation of the slider causes the rotating rod to rotate, which in turn moves the bottom plate on the frame to the top position of the bar. Then, the elastic force of the second spring causes the driven wheel on the arm plate to rotate, so that the grinding belt on the driven wheel will adhere to the surface of the bar. The operation of the fourth motor causes the grinding belt to perform back-and-forth grinding work on the surface of the bar. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the equipment body;

[0024] Figure 2 This is a rear-view three-dimensional structural diagram of the equipment body;

[0025] Figure 3 A schematic diagram of the tray's three-dimensional structure viewed from below;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the pallet;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the movable plate;

[0028] Figure 6 This is a side view of the three-dimensional structure of the movable plate.

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the frame;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of the support frame.

[0031] In the diagram: 1. Equipment body; 101. Support plate; 102. Through groove; 103. Moving plate; 104. Insert rod; 105. Connecting joint; 106. Collar; 107. First spring; 2. Connecting plate; 201. Horizontal plate; 202. Slide rod; 203. First shaft seat; 204. Side seat; 205. Rod body; 206. Linkage plate; 207. Turntable; 208. Main shaft; 209. First motor; 3. Shaft; 301. Gear plate; 302. Side plate; 303. Clamping block; 304. First hinge seat; 305. Push rod. 306. Plate; 307. Second hinge seat; 308. Mounting plate; 309. Cylinder; 400. Second shaft seat; 401. Threaded rod; 402. Second motor; 403. Sleeve block; 404. Connecting seat; 405. Slider; 406. Slide rail; 407. Rotating rod; 408. Third motor; 409. Frame; 410. Base plate; 5. Bracket; 501. Pulley; 502. Fourth motor; 503. Grinding belt; 504. Driven wheel; 505. Arm plate; 506. Limiting rod; 507. Snap ring; 508. Second spring. Detailed Implementation

[0032] 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.

[0033] Example: Reference Figure 1 - Figure 8 The device for surface treatment of cemented carbide bars shown includes a device body 1. A support plate 101 is fixedly connected to the top surface of the device body 1. Through slots 102 are formed on both sides of the top surface of the support plate 101. Movable plates 103 are arranged on both sides of the top surface of the device body 1. An insert rod 104 is inserted into the middle of the movable plate 103. One end of the insert rod 104 is fixedly connected to a connector 105, and the other end of the insert rod 104 is fixedly connected to a collar 106. A first spring 107 is sleeved on the insert rod 104. The two ends of the first spring 107 are fixedly connected to one side of the movable plate 103 and one side of the collar 106, respectively. The device also includes an adjustment component, a fastening component, and a processing component. The adjustment component is set on the support plate 101 for positioning the two ends of the bar. The fastening component is set on the movable plate 103 for fixing the two ends of the bar. The processing component is set on the support plate 101 for treating the surface of the bar.

[0034] Specifically, it should be noted that the first motor 209, the second motor 402, the third motor 408 and the fourth motor 502 are electrically connected to the control unit through wires. The specific principle is based on existing technology and will not be elaborated on here. The movement of the moving plate 103 causes the connector 105 to be positioned at both ends of the bar by the elastic force of the first spring 107.

[0035] As one embodiment of this invention, the adjustment assembly includes a docking plate 2 fixedly installed at the center of the bottom surface of the movable plate 103. The bottom end of the docking plate 2 extends to the bottom surface of the support plate 101 through a through groove 102. A horizontal plate 201 is fixedly connected to the bottom end of the docking plate 2. Both ends of the horizontal plate 201 are slidably connected to a slide rod 202. A first shaft seat 203 is fixedly connected to the bottom end of the slide rod 202. The top end of the first shaft seat 203 is fixedly connected to the support plate 101. A side seat 204 is fixedly connected to the center of one side of the horizontal plate 201. A rod 205 is fixedly connected to the side seat 204. A linkage plate 206 is rotatably connected to the bottom end of the rod 205. The other end of the linkage plate 206 is rotatably connected to a turntable 207. The turntable 207 is fixedly connected to the bottom end of the main shaft 208. The top end of the main shaft 208 is fixedly connected to the output end of a first motor 209. The first motor 209 is fixedly installed at the center of the bottom surface of the support plate 101.

[0036] Specifically, when fixing bars of different sizes, the first motor 209 operates to rotate the main shaft 208. The rotation of the main shaft 208 drives the turntable 207 to rotate. The rotation of the turntable 207 pulls the side seat 204 on the rod 205 through the linkage plate 206, which moves the side seat 204. The side seat 204 is fixedly connected to the horizontal plate 201. The movement of the side seat 204 causes the two ends of the horizontal plate 201 to slide on the slide rod 202, thereby facilitating the movement of the moving plate 103 and making it convenient to position the bars.

[0037] As one embodiment of this invention, the fastening assembly includes a pair of shafts 3 fixedly mounted on a movable plate 103. Gear discs 301 are fixedly connected to the pair of shafts 3, and the gear discs 301 mesh with each other. Side plates 302 are fixedly connected to the pair of shafts 3, and clamping blocks 303 are fixedly mounted on the side plates 302. A first hinge seat 304 is fixedly connected to the outer surface of one of the side plates 302. A push plate 305 is rotatably connected to the first hinge seat 304, and the other end of the push plate 305 is rotatably connected to a second hinge seat 306. An mounting plate 307 is fixedly mounted on the movable plate 103, and a cylinder 308 is fixedly mounted on the mounting plate 307. The telescopic end of the cylinder 308 is fixedly connected to the second hinge seat 306.

[0038] Specifically, when the connector 105 is engaged in the holes at both ends of the bar, the cylinder 308 on the mounting plate 307 operates to push the second hinge seat 306. The second hinge seat 306 is rotatably connected to the push plate 305, and the other end of the push plate 305 is rotatably connected to the first hinge seat 304. The movement of the second hinge seat 306 causes the side plate 302 on the first hinge seat 304 to rotate through the push plate 305. The active movement of the side plate 302 causes the gear plate 301 on the shaft 3 to drive the other side plate 302 to rotate, thereby facilitating the clamping block 303 to clamp the two ends of the bar.

[0039] In one embodiment of this invention, the processing component includes a pair of second shaft seats 4 fixedly mounted on the equipment body 1. A threaded rod 401 is rotatably connected between the pair of second shaft seats 4. One end of the threaded rod 401 is fixedly connected to the output end of a second motor 402. The second motor 402 is fixedly mounted on one of the second shaft seats 4. A sleeve block 403 is threadedly connected to the threaded rod 401. The top end of the sleeve block 403 is fixedly connected to a docking seat 404. The docking seat 404 is fixedly mounted on a slider 405. The slider 405 is slidably connected to a slide rail 406. The slide rail 406 is fixedly mounted on the rear side of the pallet 101. A rotating rod 407 is rotatably connected to the docking seat 404. One end of the rotating rod 407 is fixedly connected to the output end of a third motor 408. The third motor 408 is fixedly mounted on the docking seat 404. A frame 409 is attached, and a pair of base plates 410 are fixedly connected to the frame 409. The bottom ends of the pair of base plates 410 are fixedly connected to the middle of the bracket 5. The two ends of the bracket 5 are rotatably connected to pulleys 501. One end of one of the pulleys 501 is fixedly connected to the output end of the fourth motor 502. The fourth motor 502 is fixedly mounted on the bracket 5. A grinding belt 503 is sleeved on the pulley 501. The bottom end of the grinding belt 503 is attached to the driven wheel 504. The driven wheel 504 is rotatably connected to the arm plate 505. The top end of the arm plate 505 is fixedly connected to the limiting rod 506. The limiting rod 506 is rotatably connected to the bracket 5. One end of the limiting rod 506 is fixedly connected to a retaining ring 507. A second spring 508 is sleeved on the retaining ring 507. The two ends of the second spring 508 are fixedly connected to one side of the retaining ring 507 and one side of the bracket 5, respectively.

[0040] Specifically, the operation of the second motor 402 causes the threaded rod 401 to rotate, which in turn causes the mating seat 404 on the sleeve block 403 to move, thus facilitating the sliding of the slider 405 on the slide rail 406. The operation of the slider 405 causes the rotating rod 407 to rotate, which in turn causes the base plate 410 on the frame 409 to move to the top position of the bar. Then, the elastic force of the second spring 508 causes the driven wheel 504 on the arm plate 505 to rotate, thus facilitating the grinding belt 503 on the driven wheel 504 to adhere to the surface of the bar. The operation of the fourth motor 502 causes the grinding belt 503 to perform back-and-forth grinding work on the surface of the bar.

[0041] The working principle of this invention is as follows: When fixing bars of different sizes, the first motor 209 operates to rotate the main shaft 208. The rotation of the main shaft 208 drives the turntable 207 to rotate. The rotation of the turntable 207 pulls the side seat 204 on the rod 205 through the linkage plate 206, which moves the side seat 204. The side seat 204 is fixedly connected to the horizontal plate 201. The movement of the side seat 204 causes the two ends of the horizontal plate 201 to slide on the slide rod 202, thereby facilitating the movement of the moving plate 103 and making it convenient to position the bars.

[0042] When the connector 105 is engaged in the holes at both ends of the bar, the cylinder 308 on the mounting plate 307 operates to push the second hinge seat 306. The second hinge seat 306 is rotatably connected to the push plate 305, and the other end of the push plate 305 is rotatably connected to the first hinge seat 304. The movement of the second hinge seat 306 causes the side plate 302 on the first hinge seat 304 to rotate through the push plate 305. The active movement of the side plate 302 causes the gear plate 301 on the shaft 3 to drive the other side plate 302 to rotate, thereby facilitating the clamping block 303 to clamp the two ends of the bar.

[0043] The operation of the second motor 402 causes the threaded rod 401 to rotate, which in turn causes the mating seat 404 on the sleeve block 403 to move, thus facilitating the sliding of the slider 405 on the slide rail 406. The operation of the slider 405 causes the rotating rod 407 to rotate, which in turn causes the base plate 410 on the frame 409 to move to the top position of the bar. Then, the elastic force of the second spring 508 causes the driven wheel 504 on the arm plate 505 to rotate, thus facilitating the grinding belt 503 on the driven wheel 504 to adhere to the surface of the bar. The operation of the fourth motor 502 causes the grinding belt 503 to perform back-and-forth grinding work on the surface of the bar.

[0044] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface treatment device for cemented carbide bars, characterized in that, include: The equipment body (1) has a support plate (101) fixedly connected to its top surface. The support plate (101) has through slots (102) on both sides of its top surface. The equipment body (1) has a movable plate (103) on both sides of its top surface. A rod (104) is inserted into the middle of the movable plate (103). One end of the rod (104) is fixedly connected to a connector (105). The other end of the rod (104) is fixedly connected to a collar (106). A first spring (107) is sleeved on the rod (104). The two ends of the first spring (107) are fixedly connected to one side of the movable plate (103) and one side of the collar (106), respectively. It also includes an adjustment component, a fastening component, and a processing component. The adjustment component is disposed on the pallet (101) for positioning the two ends of the bar. The fastening component is disposed on the moving plate (103) for fixing the two ends of the bar. The processing component is disposed on the pallet (101) for processing the surface of the bar.

2. The surface treatment equipment for cemented carbide bars according to claim 1, characterized in that: The adjustment assembly includes a docking plate (2) fixedly installed at the center of the bottom surface of the movable plate (103). The bottom end of the docking plate (2) extends to the bottom surface of the support plate (101) through a through groove (102). A horizontal plate (201) is fixedly connected to the bottom end of the docking plate (2). The two ends of the horizontal plate (201) are slidably connected to a slide rod (202). A first bearing seat (203) is fixedly connected to the bottom end of the slide rod (202). The top end of the first bearing seat (203) is fixedly connected to the support plate (101).

3. The surface treatment equipment for cemented carbide bars according to claim 2, characterized in that: A side seat (204) is fixedly connected to the middle of one side of the horizontal plate (201), and a rod (205) is fixedly connected to the side seat (204). A linkage plate (206) is rotatably connected to the bottom end of the rod (205).

4. The surface treatment equipment for cemented carbide bars according to claim 3, characterized in that: The other end of the linkage plate (206) is rotatably connected to the turntable (207), the turntable (207) is fixedly connected to the bottom end of the main shaft (208), the top end of the main shaft (208) is fixedly connected to the output end of the first motor (209), and the first motor (209) is fixedly installed in the middle of the bottom surface of the tray (101).

5. The surface treatment equipment for cemented carbide bars according to claim 2, characterized in that: The fastening assembly includes a pair of shafts (3) fixedly mounted on the movable plate (103), a gear plate (301) fixedly connected to the pair of shafts (3), the gear plates (301) meshing with each other, a side plate (302) fixedly connected to the pair of shafts (3), and a clamping block (303) fixedly mounted on the side plate (302).

6. The surface treatment equipment for cemented carbide bars according to claim 5, characterized in that: One of the side plates (302) has a first hinge seat (304) fixedly connected to its outer surface. A push plate (305) is rotatably connected to the first hinge seat (304). The other end of the push plate (305) is rotatably connected to a second hinge seat (306). An mounting plate (307) is fixedly installed on the moving plate (103). A cylinder (308) is fixedly installed on the mounting plate (307). The telescopic end of the cylinder (308) is fixedly connected to the second hinge seat (306).

7. The surface treatment equipment for cemented carbide bars according to claim 2, characterized in that: The processing assembly includes a pair of second bearings (4) fixedly mounted on the equipment body (1), and a threaded rod (401) is rotatably connected between the pair of second bearings (4). One end of the threaded rod (401) is fixedly connected to the output end of a second motor (402), and the second motor (402) is fixedly mounted on one of the second bearings (4).

8. The surface treatment equipment for cemented carbide bars according to claim 7, characterized in that: A sleeve (403) is threadedly connected to the threaded rod (401). The top end of the sleeve (403) is fixedly connected to the docking seat (404). The docking seat (404) is fixedly installed on the slider (405). The slider (405) is slidably connected to the slide rail (406). The slide rail (406) is fixedly installed on the rear side of the support plate (101). A rotating rod (407) is rotatably connected to the docking seat (404). One end of the rotating rod (407) is fixedly connected to the output end of the third motor (408). The third motor (408) is fixedly installed on the docking seat (404).

9. The surface treatment equipment for cemented carbide bars according to claim 8, characterized in that: A frame (409) is fixedly connected to the rotating rod (407), and a pair of base plates (410) are fixedly connected to the frame (409). The bottom ends of the pair of base plates (410) are fixedly connected to the middle position of the bracket (5). Pulleys (501) are rotatably connected to both ends of the bracket (5). One end of one of the pulleys (501) is fixedly connected to the output end of the fourth motor (502). The fourth motor (502) is fixedly installed on the bracket (5).

10. The surface treatment equipment for cemented carbide bars according to claim 9, characterized in that: A grinding belt (503) is fitted on the pulley (501). The bottom end of the grinding belt (503) is attached to the driven wheel (504). The driven wheel (504) is rotatably connected to the arm plate (505). The top end of the arm plate (505) is fixedly connected to the limiting rod (506). The limiting rod (506) is rotatably connected to the bracket (5). One end of the limiting rod (506) is fixedly connected to a retaining ring (507). A second spring (508) is fitted on the retaining ring (507). The two ends of the second spring (508) are fixedly connected to one side of the retaining ring (507) and one side of the bracket (5), respectively.

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