Graded quantitative feeding device for rubber material preparation

Abstract

The utility model relates to the technical field of sizing material equipment, in particular to a graded quantitative feeding device for sizing material preparation. The grading and quantitative feeding device comprises a rack, a first metering bin, a stirring tank, a finished product tank and a second metering bin, the first metering bin, the stirring tank, the finished product tank and the second metering bin are sequentially distributed on the rack from top to bottom, and the stirring tank and the finished product tank are each provided with a vibration assembly capable of enabling the stirring tank and the finished product tank to vibrate left and right. Through mutual cooperation of the vibration assembly, the stirring tank and the finished product tank, the problem that the stirring tank and the finished product tank are blocked in the discharging process is solved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber material equipment, in particular to a graded quantitative feeding device for rubber material preparation. Background Art

[0002] Rubber is made by mixing and kneading raw materials such as carbon black, natural rubber or synthetic rubber, and additives. As the main processing object and carrier in the tire manufacturing process, rubber usually accounts for about half of the rubber. In order to make rubber have the required properties, chemical substances such as fortifiers, adhesives, and anti-aging agents must be added to it to change the physical properties of rubber such as strength, plasticity, elasticity, and durability.

[0003] The currently disclosed Chinese patent CN218196192U, a graded quantitative feeding device for an internal mixer for producing cable sheath rubber, comprises a mounting frame, a fixed ring is fixedly connected to the top surface of the mounting frame, a support plate is fixedly connected to the bottom surface of the fixed ring, a first pressure sensor is fixedly connected to the bottom surface of the support plate, a feed box is fixedly connected to the inner wall of the fixed ring, a discharge pipe is fixedly plugged into the bottom surface of the feed box, a first solenoid valve is arranged on the surface of the discharge pipe, and a connecting frame is fixedly connected to the inner wall of the mounting frame. Then, the raw materials are added to the internal mixer through the discharge mechanism, so as to achieve the goal of graded quantitative feeding of the internal mixer for producing cable sheath rubber, avoid the situation that the traditional internal mixer for producing cable sheath rubber mostly feeds materials manually, resulting in poor batching accuracy, avoid the situation that the cable sheath production quality is unqualified due to errors in batching, and make the traditional internal mixer for producing cable sheath rubber more convenient to feed.

[0004] According to the above patent, the patent realizes graded and quantitative feeding of rubber materials through the cooperation of the feed box, solenoid valve and discharge mechanism. However, the design of the tank body with coarse top and fine bottom may cause blockage of the material to be processed during the discharge process, increasing the labor intensity. Utility Model Content

[0005] Based on this, it is necessary to provide a graded quantitative feeding device for rubber preparation to address the existing technical problems. Through the mutual cooperation of the vibration component with the mixing tank and the finished product tank, the problem of blockage of the mixing tank and the finished product tank during the discharging process is solved, thereby improving work efficiency.

[0006] In order to solve the problems of the prior art, the utility model provides a graded quantitative feeding device for preparing rubber material, comprising a frame, a first metering bin, a stirring tank, a finished product tank and a second metering bin;

[0007] The first metering bin, the mixing tank, the finished product tank and the second metering bin are sequentially distributed on the frame from top to bottom, wherein the mixing tank and the finished product tank are both provided with a vibration component capable of vibrating the mixing tank and the finished product tank left and right.

[0008] Preferably, the vibration assembly comprises a first baffle and a second baffle;

[0009] The first partition is horizontally arranged inside the frame, a through hole is arranged at the center of the first partition, the stirring tank is vertically arranged above the first partition, an opening is arranged at the top of the stirring tank, a first discharge port is arranged at the bottom of the stirring tank, a first solenoid valve is arranged in the first discharge port, a hose is arranged below the first discharge port, one end of the short tube is fixedly connected to the first discharge port, and the other end of the hose passes through the through hole and extends to the finished product tank;

[0010] The second partition is horizontally arranged below the first partition, and a through hole is provided at the center of the second partition. The finished product tank is vertically arranged above the second partition, and an opening is provided at the top of the finished product tank. A second discharge port is provided at the bottom of the finished product tank, and a second solenoid valve is provided in the second discharge port. A second metering bin is vertically arranged below the second discharge port, and the top of the second metering bin is a bell mouth. The bottom of the second metering bin extends out from the through hole, and the outer walls of the finished product tank and the mixing tank are provided with fixing rings.

[0011] Preferably, a slide rail is provided on one side of the top of the first partition plate and the second partition plate;

[0012] The slide rail is mirror-imaged above the first partition, the non-working end of the slide rail is fixedly connected to the first partition, the working end of the slide rail is provided with a slider, and the slide rail and the slider are slidably connected;

[0013] A bracket is vertically provided on the top of the slider, one end of the bracket is fixedly connected to the slider, and the other end of the bracket is fixedly connected to the fixing ring. A support plate is provided on the side of the fixing ring away from the bracket, both ends of the support plate are fixedly connected to the frame, and a vibration driving part that can make the mixing tank vibrate is provided on the top of the support plate.

[0014] Preferably, the driving part includes a rotary motor and a cam;

[0015] The rotating motor is horizontally arranged above the supporting plate, a dust cover is arranged on one side of the output shaft of the rotating motor, the rotating motor is fixedly connected to the dust cover, the output shaft of the rotating motor passes through the dust cover and extends into the interior of the dust cover, and the output shaft of the rotating motor is axially connected to the dust cover.

[0016] The cam is located above the support frame, a groove is provided in the middle of the cam, a push rod is provided in the groove, one end of the push rod is connected to the cam shaft, transmission shafts are provided at both ends of the cam, the cam is fixedly connected to the transmission shaft, one end of the transmission shaft is fixedly connected to the motor output shaft, and the other end of the transmission shaft is connected to the dust cover shaft.

[0017] Preferably, a moving block is provided at the other end of the push rod;

[0018] The moving block is horizontally arranged on one side of the dust cover close to the fixed ring, a groove is arranged in the side of the moving block close to the dust cover, the other end of the push rod is located in the groove of the moving block, and the push rod is hingedly arranged with the moving block;

[0019] The connecting rod is horizontally arranged on a side of the moving block away from the dust cover, one end of the connecting rod is fixedly connected to the moving block, and the other end of the connecting rod is provided with a latex pad;

[0020] The latex pad is vertically arranged on one side of the connecting rod, one end of the latex pad close to the fixing ring is abutted against the fixing ring, and the other end of the latex pad is connected with the connecting rod screw.

[0021] Preferably, the outer portion of the connecting rod is provided with a first sleeve and a second sleeve;

[0022] The first sleeve is a stepped type, and is horizontally arranged outside the connecting rod, one end of the first sleeve is fixedly connected to the fixing ring, and the other end of the first sleeve faces the dust cover;

[0023] One end of the second sleeve is sleeved on the outside of the first sleeve, and the other end of the second sleeve is sleeved on the outer wall of the moving block and fixedly connected with the dust cover.

[0024] Preferably, the second sleeve is mirror-imaged with a vibration auxiliary part on both sides, and the vibration auxiliary part includes a third sleeve, a fourth sleeve, a limit rod, a spring and a spring pad;

[0025] The third sleeve is horizontally arranged on one side of the dust cover, one end of the third sleeve is fixedly connected to the dust cover, and the other end of the third sleeve faces the fixing ring;

[0026] The fourth sleeve is coaxially arranged on one side of the fixing ring with the third sleeve, one end of the fourth sleeve is fixedly connected to the fixing ring, the other end of the fourth sleeve faces the third sleeve, and a gap is left between the opposite surfaces of the fourth sleeve and the third sleeve;

[0027] The buffer block is vertically arranged at the inner center of the third sleeve, and the buffer block is fixedly connected to the third sleeve;

[0028] The limiting rod is horizontally arranged inside the third sleeve and the fourth sleeve, one end of the limiting rod is fixedly connected to the fixing ring, and the other end of the driven rod passes through the buffer block;

[0029] The spring and the limiting rod are coaxially arranged inside the third sleeve and the fourth sleeve, one end of the spring is fixedly connected to the fixing ring, and the other end of the spring is fixedly connected to the buffer block.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. This application solves the problem of material blockage in the mixing tank and the finished product tank during the discharging process by the mutual cooperation of the vibration component with the mixing tank and the finished product tank, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional structural schematic diagram of a graded quantitative feeding device for rubber compound preparation.

[0033] Figure 2 The present invention is a front view of a graded quantitative feeding device for preparing rubber compound.

[0034] Figure 3 The present invention is a three-dimensional structural cross-sectional view of a graded quantitative feeding device for preparing rubber compound.

[0035] Figure 4 A partial three-dimensional cutaway view of a graded quantitative feeding device for rubber preparation Figure 1 .

[0036] Figure 5 A partial three-dimensional cutaway view of a graded quantitative feeding device for rubber preparation Figure 2 .

[0037] The numbers in the figure are: 1-frame; 2-first metering bin; 3-mixing tank; 31-fixed ring; 32-hose; 33-first solenoid valve; 34-first discharge port; 4-finished product tank; 41-second discharge port; 42-second solenoid valve; 5-second metering bin; 6-vibration assembly; 61-first partition; 611-slide rail; 612-slider; 613-bracket; 614-support plate; 62-second partition; 63-driving unit; 631-rotating motor; 6311-transmission shaft; 632-cam; 6321-push rod; 633-dust cover; 64-moving block; 641-first sleeve; 642-second sleeve; 65-connecting rod; 66-latex pad; 67-vibration auxiliary unit; 671-third sleeve; 672-fourth sleeve; 673-limiting rod; 674-spring; 675-buffer block. DETAILED DESCRIPTION

[0038] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] See also Figures 1 to 5 As shown, a graded quantitative feeding device for preparing rubber material comprises a frame 1, a first metering bin 2, a stirring tank 3, a finished product tank 4 and a second metering bin 5;

[0040] The first metering bin 2, the mixing tank 3, the finished product tank 4 and the second metering bin 5 are sequentially distributed on the frame 1 from top to bottom, wherein the mixing tank 3 and the finished product tank 4 are both provided with a vibration component 6 that can make the mixing tank 3 and the finished product tank 4 vibrate left and right.

[0041] A plurality of first metering bins 2 are provided on the top of the frame 1. When working, the vibration component 6 is started, and the material to be processed enters the first metering bin 2. When the weight of the material to be processed reaches a preset value, the bottom of the first metering bin 2 is opened, and the material to be processed in the first metering bin 2 enters the mixing tank 3. When the mixing tank 3 mixes the material to be processed evenly, the bottom of the mixing tank 3 is opened, and the material to be processed enters the finished product tank 4 from the mixing tank 3. The bottom of the finished product tank 4 is opened, and the material to be processed in the finished product tank 4 enters the second metering bin 5. When the weight of the second metering bin 5 reaches a preset value, the bottom of the finished product tank 4 is closed, and the bottom of the second metering bin 5 is opened. The evenly mixed material to be processed in the second metering bin 5 will enter the next process. During the working process, the vibration component 6 continuously shakes the mixing tank 3 and the finished product tank 4, thereby avoiding the problem that the material to be processed will be blocked at the outlet during the unloading process of the mixing tank 3 and the finished product tank 4, thereby improving the production efficiency.

[0042] See also Figure 2 and Figure 3 As shown, the vibration assembly 6 includes a first baffle 61 and a second baffle 62;

[0043] The first partition 61 is horizontally arranged inside the frame 1, and a through hole is provided at the center of the first partition 61. The stirring tank 3 is vertically arranged above the first partition 61, and an opening is provided at the top of the stirring tank 3. A first discharge port 34 is provided at the bottom of the stirring tank 3, and a first solenoid valve 33 is provided in the first discharge port 34. A hose 32 is provided below the first discharge port 34, and one end of the short tube is fixedly connected to the first discharge port 34, and the other end of the hose 32 passes through the through hole and extends to the finished product tank 4;

[0044] The second partition 62 is horizontally arranged below the first partition 61, and a through hole is provided at the center of the second partition 62. The finished product tank 4 is vertically arranged above the second partition 62, and an opening is provided at the top of the finished product tank 4. A second discharge port 41 is provided at the bottom of the finished product tank 4. A second solenoid valve 42 is provided in the second discharge port 41, and a second metering bin 5 is vertically provided below the second discharge port 41. The top of the second metering bin 5 is a bell mouth, and the bottom of the second metering bin 5 extends out from the through hole. The outer walls of the finished product tank 4 and the stirring tank 3 are provided with fixing rings 31.

[0045] During operation, when the first material port of the hose 32 deviates from the through hole on the first partition plate 61 , the evenly stirred processed material can also enter the finished product tank 4 .

[0046] See also Figure 2As shown, a slide rail 611 is provided at one side of the top of the first partition plate 61 and the second partition plate 62;

[0047] The slide rail 611 is mirror-imaged above the first partition 61, the non-working end of the slide rail 611 is fixedly connected to the first partition 61, and a slider 612 is provided on the working end of the slide rail 611, and the slide rail 611 and the slider 612 are slidably connected;

[0048] A bracket 613 is vertically provided on the top of the slider 612, one end of the bracket 613 is fixedly connected to the slider 612, and the other end of the bracket 613 is fixedly connected to the fixing ring 31. A support plate 614 is provided on the side of the fixing ring 31 away from the bracket 613, both ends of the support plate 614 are fixedly connected to the frame 1, and a vibration driving part 63 capable of vibrating the mixing tank 3 is provided on the top of the support plate 614.

[0049] During operation, when the vibration driving part 63 induces vibration, the bracket 613 and the slider 612 are fixedly connected, and the slider 612 and the slide rail 611 are slidably connected. To a certain extent, the bracket 613 not only supports the mixing tank 3, but also plays a buffering role through the sliding connection between the slide rail 611 and the slider 612.

[0050] See also Figure 3 and Figure 5 As shown, the driving part 63 includes a rotary motor 631 and a cam 632;

[0051] The rotating motor 631 is horizontally arranged above the supporting plate 614. A dust cover 633 is arranged on one side of the output shaft of the rotating motor 631. The rotating motor 631 is fixedly connected to the dust cover 633. The output shaft of the rotating motor 631 passes through the dust cover 633 and extends into the interior of the dust cover 633. The output shaft of the rotating motor 631 is axially connected to the dust cover 633.

[0052] The cam 632 is located above the support frame, and a groove is provided in the middle of the cam 632. A push rod 6321 is provided in the groove. One end of the push rod 6321 is axially connected to the cam 632. Both ends of the cam 632 are provided with a transmission shaft 6311. The cam 632 is fixedly connected to the transmission shaft 6311, one end of the transmission shaft 6311 is fixedly connected to the motor output shaft, and the other end of the transmission shaft 6311 is axially connected to the dust cover 633.

[0053] During operation, the rotating motor 631 drives the transmission shaft 6311 connected to the cam 632 to rotate, and the cam 632 drives the push rod 6321 to reciprocate, and the vibration component 6 can drive the stirring tank 3 to move repeatedly, thereby achieving a vibration effect.

[0054] See also Figure 4 As shown, a moving block 64 is provided at the other end of the push rod 6321;

[0055] The moving block 64 is horizontally arranged on one side of the dust cover 633 close to the fixed ring 31. A groove is arranged in the side of the moving block 64 close to the dust cover 633. The other end of the push rod 6321 is located in the groove of the moving block 64. The push rod 6321 is hingedly arranged with the moving block 64.

[0056] The connecting rod 65 is horizontally arranged on a side of the moving block 64 away from the dust cover 633, one end of the connecting rod 65 is fixedly connected to the moving block 64, and the other end of the connecting rod 65 is provided with a latex pad 66;

[0057] The latex pad 66 is vertically arranged on one side of the connecting rod 65 , one end of the latex pad 66 close to the fixing ring 31 is abutted against the fixing ring 31 , and the other end of the latex pad 66 is screw-connected to the connecting rod 65 .

[0058] During operation, the push rod 6321 pushes the moving block 64 to move, the moving block 64 drives the connecting rod 65 to move, and the latex pad 66 on the top of the connecting rod 65 pushes the fixing ring 31 to move. The latex pad 66 can play a buffering role when pushing the mixing tank 3.

[0059] See also Figure 4 As shown, the outer portion of the connecting rod 65 is sleeved with a first sleeve 641 and a second sleeve 642;

[0060] The first sleeve 641 is stepped and horizontally disposed outside the connecting rod 65. One end of the first sleeve 641 is fixedly connected to the fixing ring 31, and the other end of the first sleeve 641 faces the dust cover 633.

[0061] One end of the second sleeve 642 is sleeved on the outside of the first sleeve 641 , and the other end of the second sleeve 642 is sleeved on the outer wall of the moving block 64 and fixedly connected to the dust cover 633 .

[0062] During operation, the first sleeve 641 and the second sleeve 642 are sleeved together to ensure that the moving block 64 inside the sleeve can only maintain horizontal movement.

[0063] See also Figure 2 As shown in FIG. 4 , the second sleeve 642 is mirror-imaged with a vibration auxiliary part 67 on both sides thereof, and the vibration auxiliary part 67 includes a third sleeve 671 , a fourth sleeve 672 , a limit rod 673 , a spring 674 and a spring 674 pad;

[0064] The third sleeve 671 is horizontally arranged on one side of the dust cover 633, one end of the third sleeve 671 is fixedly connected to the dust cover 633, and the other end of the third sleeve 671 faces the fixing ring 31;

[0065] The fourth sleeve 672 is coaxially arranged on one side of the fixing ring 31 with the third sleeve 671. One end of the fourth sleeve 672 is fixedly connected to the fixing ring 31, and the other end of the fourth sleeve faces the third sleeve 671. A gap is left between the opposite surfaces of the fourth sleeve 672 and the third sleeve 671.

[0066] The buffer block 675 is vertically disposed at the inner center of the third sleeve 671 , and the buffer block 675 is fixedly connected to the third sleeve 671 ;

[0067] The limiting rod 673 is horizontally arranged inside the third sleeve 671 and the fourth sleeve 672, one end of the limiting rod 673 is fixedly connected to the fixing ring 31, and the other end of the driven rod passes through the buffer block 675;

[0068] The spring 674 is coaxially arranged with the limiting rod 673 inside the third sleeve 671 and the fourth sleeve 672 . One end of the spring 674 is fixedly connected to the fixing ring 31 , and the other end of the spring 674 is fixedly connected to the buffer block 675 .

[0069] During operation, when the moving block 64 drives the connecting rod 65 and the latex pad 66 connected thereto to push the mixing tank 3 to move, the spring 674 inside the third sleeve 671 and the fourth sleeve 672 will pull the tank body back, and the gap between the third sleeve 671 and the fourth sleeve 672 can play a good buffering role. The limiting rod 673 can ensure that the position of the spring 674 will not shift during operation, and the buffer block 675 will guide the limiting rod 673 to move horizontally.

[0070] The above embodiments only express one or several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A graded quantitative feeding device for preparing rubber material, characterized in that: It comprises a frame (1), a first metering bin (2), a mixing tank (3), a finished product tank (4) and a second metering bin (5); The first metering bin (2), the stirring tank (3), the finished product tank (4) and the second metering bin (5) are sequentially arranged on the frame (1) from top to bottom, wherein the stirring tank (3) and the finished product tank (4) are both provided with a vibration component (6) capable of causing the stirring tank (3) and the finished product tank (4) to vibrate left and right.

2. A graded quantitative feeding device for preparing rubber material according to claim 1, characterized in that: The vibration assembly (6) comprises a first partition plate (61) and a second partition plate (62); The first partition (61) is horizontally arranged inside the frame (1), a through hole is provided at the center of the first partition (61), the stirring tank (3) is vertically arranged above the first partition (61), an opening is provided at the top of the stirring tank (3), a first discharge port (34) is provided at the bottom of the stirring tank (3), a first solenoid valve (33) is provided in the first discharge port (34), a hose (32) is provided below the first discharge port (34), one end of the short tube is fixedly connected to the first discharge port (34), and the other end of the hose (32) passes through the through hole and extends to the finished product tank (4); The second partition (62) is horizontally arranged below the first partition (61), and a through hole is provided at the center of the second partition (62). The finished product tank (4) is vertically arranged above the second partition (62), and an opening is provided at the top of the finished product tank (4). A second discharge port (41) is provided at the bottom of the finished product tank (4), and a second solenoid valve (42) is provided in the second discharge port (41). A second metering bin (5) is vertically arranged below the second discharge port (41), and the top of the second metering bin (5) is a bell mouth. The bottom of the second metering bin (5) extends out from the through hole. The outer walls of the finished product tank (4) and the stirring tank (3) are both provided with fixing rings (31).

3. A graded quantitative feeding device for preparing rubber material according to claim 2, characterized in that: A slide rail (611) is provided on one side of the top of the first partition plate (61) and the second partition plate (62); The slide rail (611) is mirror-imaged above the first partition (61), the non-working end of the slide rail (611) is fixedly connected to the first partition (61), the working end of the slide rail (611) is provided with a slider (612), and the slide rail (611) and the slider (612) are slidably connected; A bracket (613) is vertically arranged on the top of the slider (612); one end of the bracket (613) is fixedly connected to the slider (612); the other end of the bracket (613) is fixedly connected to the fixing ring (31); a support plate (614) is arranged on the side of the fixing ring (31) away from the bracket (613); both ends of the support plate (614) are fixedly connected to the frame (1); and a vibration driving part (63) capable of causing the stirring tank (3) to vibrate is arranged on the top of the support plate (614).

4. A graded quantitative feeding device for preparing rubber material according to claim 3, characterized in that: The driving unit (63) includes a rotating motor (631) and a cam (632); The rotating motor (631) is horizontally arranged above the supporting plate (614); a dust cover (633) is arranged on one side of the output shaft of the rotating motor (631); the rotating motor (631) and the dust cover (633) are fixedly connected; the output shaft of the rotating motor (631) passes through the dust cover (633) and extends into the interior of the dust cover (633); the output shaft of the rotating motor (631) and the dust cover (633) are axially connected; The cam (632) is located above the support frame, a groove is provided in the middle of the cam (632), a push rod (6321) is provided in the groove, one end of the push rod (6321) is axially connected to the cam (632), both ends of the cam (632) are provided with a transmission shaft (6311), the cam (632) is fixedly connected to the transmission shaft (6311), one end of the transmission shaft (6311) is fixedly connected to the motor output shaft, and the other end of the transmission shaft (6311) is axially connected to the dust cover (633).

5. A graded quantitative feeding device for preparing rubber material according to claim 4, characterized in that: The other end of the push rod (6321) is provided with a moving block (64); The moving block (64) is horizontally arranged on a side of the dust cover (633) close to the fixed ring (31); a groove is arranged in the side of the moving block (64) close to the dust cover (633); the other end of the push rod (6321) is located in the groove of the moving block (64); and the push rod (6321) is hingedly arranged with the moving block (64).

6. A graded quantitative feeding device for preparing rubber material according to claim 5, characterized in that: The connecting rod (65) is horizontally arranged on a side of the moving block (64) away from the dust cover (633), one end of the connecting rod (65) is fixedly connected to the moving block (64), and the other end of the connecting rod (65) is provided with a latex pad (66).

7. A graded quantitative feeding device for preparing rubber material according to claim 6, characterized in that: The latex pad (66) is vertically arranged on one side of the connecting rod (65), one end of the latex pad (66) close to the fixing ring (31) is arranged in contact with the fixing ring (31), and the other end of the latex pad (66) is screw-connected to the connecting rod (65).

8. A graded quantitative feeding device for preparing rubber material according to claim 7, characterized in that: The connecting rod (65) is externally sleeved with a first sleeve (641) and a second sleeve (642); The first sleeve (641) is stepped, and is horizontally arranged outside the connecting rod (65). One end of the first sleeve (641) is fixedly connected to the fixing ring (31), and the other end of the first sleeve (641) faces the dust cover (633). One end of the second sleeve (642) is sleeved on the outside of the first sleeve (641), and the other end of the second sleeve (642) is sleeved on the outer wall of the moving block (64) and fixedly connected to the dust cover (633).

9. A graded quantitative feeding device for preparing rubber material according to claim 8, characterized in that: Vibration auxiliary parts (67) are arranged in mirror images on both sides of the second sleeve (642), and the vibration auxiliary parts (67) include a third sleeve (671), a fourth sleeve (672), a limit rod (673), a spring (674) and a spring (674) pad; The third sleeve (671) is horizontally arranged on one side of the dust cover (633), one end of the third sleeve (671) is fixedly connected to the dust cover (633), and the other end of the third sleeve (671) faces the fixing ring (31); The fourth sleeve (672) is coaxially arranged on one side of the fixing ring (31) with the third sleeve (671), one end of the fourth sleeve (672) is fixedly connected to the fixing ring (31), the other end of the fourth sleeve faces the third sleeve (671), and a gap is left between the opposite surfaces of the fourth sleeve (672) and the third sleeve (671); The buffer block (675) is vertically arranged at the inner center of the third sleeve (671), and the buffer block (675) is fixedly connected to the third sleeve (671); The limiting rod (673) is horizontally arranged inside the third sleeve (671) and the fourth sleeve (672), one end of the limiting rod (673) is fixedly connected to the fixing ring (31), and the other end of the driven rod passes through the buffer block (675); The spring (674) and the limiting rod (673) are coaxially arranged inside the third sleeve (671) and the fourth sleeve (672); one end of the spring (674) is fixedly connected to the fixing ring (31), and the other end of the spring (674) is fixedly connected to the buffer block (675).

Images