Improved helmet cutting machine

Abstract

The utility model discloses an improved helmet cutting machine which comprises a mounting frame, a cutting mechanism is arranged on the mounting frame, the cutting mechanism comprises a supporting frame, a mounting sleeve, a transmission shaft, a hinge frame, a hydraulic cylinder, a cutting blade and a transmission mechanism, the supporting frame is rotatably mounted at the top end of the mounting frame, the mounting sleeve is mounted at the top end of the mounting frame, and the transmission shaft is mounted on the mounting frame. The transmission shaft is rotationally installed in the installation sleeve, the hinge frame is rotationally installed at the lower end of the installation frame, the two ends of the hydraulic cylinder are rotationally connected with the hinge frame and the supporting frame respectively, the cutting blade is installed at one end of the transmission shaft through the quick installation mechanism, and the transmission mechanism is arranged on the supporting frame. And the quick mounting mechanism comprises an inserting rod, a fixing sleeve, a fixing disc, a through hole, a sliding rod, a clamping block, a clamping groove and a push plate, and the inserting rod is arranged at one end of the transmission shaft, so that the technical problem that the cutting blade is inconvenient to quickly dismount, mount and replace in the background art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of modern industrial production, and more particularly to an improved helmet cutting machine. Background Art

[0002] In modern industrial production, cutting machines are an important processing equipment and are widely used in cutting various materials. Among them, the cutting disc is the core component of the cutting machine and directly affects the quality and efficiency of cutting. However, the cutting disc will show problems such as wear, passivation or damage during long-term use. This requires regular replacement of the cutting disc to ensure the normal operation of the cutting machine and the stability of the processing quality.

[0003] However, the cutting machines in the prior art have obvious deficiencies in the replacement of cutting blades. The traditional cutting blade installation method usually involves complicated disassembly and installation steps, requires the use of special tools, and the operation is cumbersome and time-consuming, which not only reduces production efficiency but also increases the workload of operators. In addition, in some high-precision or high-frequency cutting operations, the need for quick replacement of cutting blades is particularly prominent, but the existing cutting machine structure often finds it difficult to meet this requirement. This design, which is not convenient for quick disassembly, installation and replacement of cutting blades, has become an important factor restricting the performance improvement and production efficiency improvement of cutting machines. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the problems existing in the prior art, the utility model provides an improved helmet cutting machine to solve the technical problem mentioned in the background art that it is inconvenient to quickly disassemble, install and replace the cutting blade.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: an improved helmet cutting machine, comprising a mounting frame, a cutting mechanism provided on the mounting frame, the cutting mechanism comprising a support frame, a mounting sleeve, a transmission shaft, an articulated frame, a hydraulic cylinder, a cutting blade and a transmission mechanism, the support frame being rotatably mounted on the top of the mounting frame, the mounting sleeve being mounted on the top of the mounting frame, the transmission shaft being rotatably mounted in the mounting sleeve, the articulated frame being rotatably mounted on the lower end of the mounting frame, the two ends of the hydraulic cylinder being rotatably connected to the articulated frame and the supporting frame, the cutting blade being provided with a The quick-loading mechanism is installed at one end of the transmission shaft, and the transmission mechanism is arranged on the support frame. The quick-loading mechanism includes an insertion rod, a fixed sleeve, a fixed disk, a through hole, a sliding rod, a card block, a card slot and a push plate. The insertion rod is arranged at one end of the transmission shaft, the fixed sleeve is sleeved on the top of the insertion rod, the fixed disk is installed at the bottom end of the fixed sleeve, the through holes are provided with multiple groups distributed on the outer wall of the fixed sleeve, the sliding rod is provided with multiple groups and are respectively slidably installed in multiple groups of through holes, the card block is installed at the bottom ends of multiple groups of sliding rods, the card slot is provided on the outer wall of the insertion rod, and the push plate is provided in the fixed sleeve.

[0008] The utility model is further configured such that a material receiving hopper is mounted on the mounting frame, and a material discharging platform is slidably mounted on the material receiving hopper, thereby improving work efficiency and environmental cleanliness, and increasing operational flexibility.

[0009] The utility model is further configured such that the transmission mechanism includes a motor, a driving wheel, a transmission wheel and a transmission belt, the motor is mounted on a mounting frame, the driving wheel is mounted on an output end of the motor, the transmission wheel is mounted on one end of a transmission shaft, and the transmission belt is mounted on the outer wall of the driving wheel and the transmission wheel, thereby achieving efficient and stable power transmission and ensuring high-speed and stable rotation of the cutting blade.

[0010] The utility model is further configured such that a limit strip is provided on the outer wall of the insertion rod, and a limit slot is provided on the inner wall of the fixing sleeve. The limit strips and the limit slots are provided in multiple groups and are adapted to each other, thereby improving the installation accuracy and stability and preventing the cutting blade from shifting during use.

[0011] The utility model is further configured such that multiple groups of the through holes are provided with sliding grooves, multiple groups of the outer walls of the sliding rods are provided with sliding bars, and multiple groups of the sliding grooves are slidably connected to the sliding bars, thereby ensuring the accuracy and smoothness of the sliding rod movement and improving the reliability of the quick-installation mechanism.

[0012] The utility model is further configured such that the top ends of the multiple groups of sliding rods are provided with ball blocks, compression springs are connected between the multiple groups of ball blocks and the inner wall of the fixed sleeve, and a compression spring is connected between the push plate and the top end of the fixed sleeve, thereby enhancing the locking effect and having a certain shock-absorbing effect, thereby extending the service life of the equipment.

[0013] The present invention is further configured such that a locking mechanism is provided on the outer wall of the fixed sleeve, and the locking mechanism includes a locking sleeve, a locking groove, a limiting sleeve, a limiting hole, a rotating sleeve, a support rod and a limiting block. The locking sleeve is slidably mounted on the outer wall of the fixed sleeve, the locking groove is arranged on multiple groups of the sliding rods, the limiting sleeve is mounted on the bottom end of the locking sleeve, the limiting holes are provided in multiple groups distributed on the limiting sleeve, the rotating sleeve is rotatably mounted on the outer wall of the fixed sleeve, the support rods are provided in multiple groups mounted on the top surface of the rotating sleeve, and the limiting blocks are respectively mounted on the top ends of the multiple groups of support rods, which provides additional safety protection and significantly improves the stability and reliability of the installation of the cutting blade 7.

[0014] The utility model is further configured such that the outer walls of the multiple groups of support rods are provided with push springs, and the bottom ends of the multiple groups of push springs are fixedly connected to the rotating sleeves, thereby ensuring the stability of the locked state and providing the necessary elastic support for the unlocking operation, making the operation smoother.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides an improved helmet cutting machine with the following beneficial effects:

[0017] 1. Beneficial effects of the cutting mechanism: The cutting mechanism realizes flexible adjustment of the position and angle of the cutting blade through the ingenious coordination of the support frame, mounting sleeve, transmission shaft, articulated frame and hydraulic cylinder, adapting to the cutting needs of helmets of different shapes and sizes, greatly improving the cutting accuracy and adaptability. The use of the hydraulic cylinder makes the adjustment process smoother and more precise, reducing operational errors. The combination of the motor, driving wheel, transmission wheel and transmission belt in the transmission mechanism ensures the high-speed and stable rotation of the cutting blade, improving the cutting efficiency. At the same time, the design of the receiving hopper and sliding discharge table facilitates waste collection and workpiece positioning, further improving the overall work efficiency and environmental cleanliness.

[0018] 2. Beneficial effects of the quick-loading mechanism: The quick-loading mechanism realizes the rapid installation and disassembly of the cutting blade through the ingenious design of the insertion rod, fixed sleeve, fixed plate, through-hole, slide rod, card block, card slot and push plate, which greatly saves the time of replacing the cutting blade and improves production efficiency. The cooperation between the limit strip on the outer wall of the insertion rod and the limit slot on the inner wall of the fixed sleeve ensures the accuracy of the installation position. The sliding design of multiple sets of slide rods in the through-hole, combined with the engagement of the card block and the card slot, provides multi-point fixation, enhances the stability and safety of the connection. The design of the ball block, pressure spring and compression spring provides elastic support for the entire mechanism, which not only enhances the locking effect, but also absorbs vibration to a certain extent, extending the service life of the equipment. The sliding connection design of the slide groove and the slide bar ensures the smoothness and accuracy of the slide rod movement, further improving the reliability of the quick-loading mechanism.

[0019] 3. Beneficial effects of the locking mechanism: The locking mechanism provides additional safety for the quick-installation mechanism through the ingenious combination of the locking sleeve, lock groove, limit sleeve, limit hole, rotating sleeve, support rod and limit block, which significantly improves the stability and reliability of the cutting blade installation. The engagement design of the locking sleeve and the lock groove on the slide rod provides initial locking, while the design of the rotating sleeve, support rod and limit block realizes secondary locking, which greatly reduces the risk of the cutting blade loosening or falling off during high-speed operation. The design of the limit sleeve and limit hole allows the operator to quickly unlock when needed, which is convenient for the replacement and maintenance of the cutting blade. The push spring design on the outer wall of the support rod not only ensures the stability of the locked state, but also provides the necessary elastic support for the unlocking operation, making the entire locking and unlocking process smoother and more controllable. This multiple locking and convenient unlocking design greatly improves the operational safety and use efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the improved helmet cutting machine in the present utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the mounting sleeve in the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the quick-loading mechanism of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the clamping block and the insertion rod in the utility model;

[0024] Figure 5 It is a structural schematic diagram of the locking mechanism in the present utility model.

[0025] In the figure: 1. Mounting frame; 2. Support frame; 3. Mounting sleeve; 4. Drive shaft; 5. Articulated frame; 6. Hydraulic cylinder; 7. Cutting disc; 8. Insert rod; 9. Fixed sleeve; 10. Fixed plate; 11. Through hole; 12. Slide rod; 13. Block; 14. Slot; 15. Push plate; 16. Material collecting hopper; 17. Material discharge table; 18. Motor; 19. Driving wheel; 20. Transmission wheel; 21. Transmission belt; 22. Limiting strip; 23. Limiting slot; 24. Slide groove; 25. Slide strip; 26. Ball block; 27. Compression spring; 28. Compression spring; 29. Locking sleeve; 30. Locking slot; 31. Limiting sleeve; 32. Limiting hole; 33. Rotating sleeve; 34. Support rod; 35. Limiting block; 36. Push spring. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually relative to the directions shown in the drawings, or relative to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually relative to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned direction words are not used to limit the present invention.

[0029] See also Figure 1-Figure 5 , the improved helmet cutting machine includes a mounting frame 1, a cutting mechanism is provided on the mounting frame 1, the cutting mechanism includes a support frame 2, a mounting sleeve 3, a transmission shaft 4, an articulated frame 5, a hydraulic cylinder 6, a cutting blade 7 and a transmission mechanism, the support frame 2 is rotatably mounted on the top of the mounting frame 1, the mounting sleeve 3 is mounted on the top of the mounting frame 1, the transmission shaft 4 is rotatably mounted in the mounting sleeve 3, the articulated frame 5 is rotatably mounted at the lower end of the mounting frame 1, and the two ends of the hydraulic cylinder 6 are respectively rotatably connected to the articulated frame 5 and the support frame 2. The cutting blade 7 is mounted on one end of the transmission shaft 4 through a quick-install mechanism. The transmission mechanism Arranged on the support frame 2, the quick-install mechanism includes an insertion rod 8, a fixed sleeve 9, a fixed disk 10, a through hole 11, a slide rod 12, a block 13, a slot 14 and a push plate 15. The insertion rod 8 is arranged at one end of the transmission shaft 4, the fixed sleeve 9 is sleeved on the top of the insertion rod 8, the fixed disk 10 is installed at the bottom end of the fixed sleeve 9, a plurality of through holes 11 are provided and distributed on the outer wall of the fixed sleeve 9, a plurality of slide rods 12 are provided and slidably installed in the plurality of through holes 11, the block 13 is installed at the bottom end of the plurality of slide rods 12, the slot 14 is provided on the outer wall of the insertion rod 8, and the push plate 15 is provided in the fixed sleeve 9.

[0030] A material collecting hopper 16 is installed on the mounting frame 1, and a material discharge platform 17 is slidably installed on the material collecting hopper 16. The material collecting hopper 16 is fixedly installed on the mounting frame 1 and is used to collect waste generated during the cutting process. The material discharge platform 17 is slidably installed on the material collecting hopper 16 and can be adjusted in position as needed to facilitate the placement and fixation of the helmet to be cut.

[0031] The transmission mechanism includes a motor 18, a driving wheel 19, a transmission wheel 20 and a transmission belt 21. The motor 18 is installed on the mounting frame 1, the driving wheel 19 is installed at the output end of the motor 18, the transmission wheel 20 is installed at one end of the transmission shaft 4, and the transmission belt 21 is installed on the outer walls of the driving wheel 19 and the transmission wheel 20 to form a complete power transmission system. When the motor 18 is started, the power is transmitted to the transmission shaft 4 through this system, thereby driving the cutting blade 7 to rotate.

[0032] A limiting strip 22 is provided on the outer wall of the insertion rod 8, and a limiting groove 23 is provided on the inner wall of the fixing sleeve 9. There are multiple sets of limiting strips 22 and limiting grooves 23 and they are adapted to each other. When the insertion rod 8 is inserted into the fixing sleeve 9, the limiting strips 22 and limiting grooves 23 cooperate with each other to ensure correct positioning.

[0033] The plurality of through holes 11 are provided with sliding grooves 24 , and the outer walls of the plurality of slide bars 12 are provided with slide bars 25 . The plurality of sliding grooves 24 are slidably connected to the slide bars 25 . This design enables the slide bars 12 to slide smoothly in the through holes 11 .

[0034] A ball block 26 is provided at the top of each of the multiple groups of slide rods 12, and a compression spring 27 is connected between each of the multiple groups of ball blocks 26 and the inner wall of the fixed sleeve 9. A compression spring 28 is connected between the push plate 15 and the top inner wall of the fixed sleeve 9. The push plate 15 and the top inner wall of the fixed sleeve 9 are connected through the compression spring 28. This design provides elastic support for the entire mechanism.

[0035] In this embodiment, the operator places the helmet on the discharge table 17, slides the discharge table 17 to a suitable position, uses the quick-install mechanism to install the cutting blade 7 on the transmission shaft 4, inserts the cutting blade 7 on the insertion rod 8, and then sleeves the fixing sleeve 9 on the insertion rod 8 so that the fixing disk 10 presses the cutting blade 7, and the limiting strip 22 on the outer wall of the insertion rod 8 is aligned with the limiting groove 23 on the inner wall of the fixing sleeve 9 to ensure correct positioning. The push plate 15 is pushed by the top of the insertion rod 8 to squeeze the compression spring 28 at the same time, so that the push plate 15 pushes multiple groups of push blocks and squeezes multiple groups of compression springs 27 at the same time, thereby pushing multiple groups of slide bars 12 in the through holes 11 Slide, the block 13 at the bottom of the slide rod 12 is inserted into the groove 14 on the outer wall of the insertion rod 8 to achieve preliminary installation, and then the multiple groups of slide rods 12 are fixed by the locking mechanism to complete the quick installation, and the reset elastic force of the compression spring 28 and the multiple groups of compression springs 27 exerts reverse pressure on the fixed rod, so that the multiple groups of block 13 have a better clamping effect on the fixed rod, and then start the motor 18 to drive the active wheel 19 to rotate, drive the transmission belt 21 to drive the transmission wheel 20 and the transmission shaft 4, thereby driving the cutting blade 7 to rotate at high speed, and then the hydraulic cylinder 6 is extended and retracted to drive the articulated frame 5 and the support frame 2 to rotate, thereby driving the cutting blade 7 to cut the helmet.

[0036] See also Figure 5 As an implementation method of the limiting mechanism: a locking mechanism is provided on the outer wall of the fixed sleeve 9, the locking mechanism includes a locking sleeve 29, a locking groove 30, a limiting sleeve 31, a limiting hole 32, a rotating sleeve 33, a support rod 34 and a limiting block 35. The locking sleeve 29 is slidably installed on the outer wall of the fixed sleeve 9, the locking groove 30 is provided on multiple groups of sliding rods 12, the limiting sleeve 31 is installed at the bottom end of the locking sleeve 29, the limiting holes 32 are provided with multiple groups distributed on the limiting sleeve 31, the rotating sleeve 33 is rotatably installed on the outer wall of the fixed sleeve 9, the support rod 34 is provided with multiple groups installed on the top surface of the rotating sleeve 33, and the limiting blocks 35 are respectively installed on the top of the multiple groups of support rods 34.

[0037] The outer walls of the multiple groups of support rods 34 are provided with push springs 36, and the bottom ends of the multiple groups of push springs 36 are fixedly connected to the rotating sleeve 33. The multiple groups of push springs 36 push the limit sleeve 31 so that its top surface abuts against the bottom surface of the multiple groups of limit blocks 35, so that the limit sleeve 31 and the locking sleeve 29 are always in an unlocked state.

[0038] When the locking cam 31 is unlocked, the locking cam 31 is unlocked and the locking cam 31 is in the unlocked state.

[0039] In summary, when the overall equipment is in use or running: the operator places the helmet on the discharge table 17, slides the discharge table 17 to the appropriate position, uses the quick-install mechanism to install the cutting blade 7 on the transmission shaft 4, inserts the cutting blade 7 on the insertion rod 8, and then puts the fixing sleeve 9 on the insertion rod 8 so that the fixing disk 10 presses the cutting blade 7, and the limiting strip 22 on the outer wall of the insertion rod 8 is aligned with the limiting groove 23 on the inner wall of the fixing sleeve 9 to ensure correct positioning, and pushes the push plate 15 through the top of the insertion rod 8 to squeeze the compression spring 28 at the same time, so that the push plate 15 pushes multiple groups of push blocks and squeezes multiple groups of compression springs 27 at the same time, thereby pushing multiple groups of slide bars 12 in The through hole 11 slides, and the block 13 at the bottom end of the slide rod 12 is inserted into the groove 14 on the outer wall of the insertion rod 8 to achieve preliminary installation. Then, the multiple sets of slide rods 12 are fixed by the locking mechanism to complete the quick installation. The reset elastic force of the compression spring 28 and the multiple sets of compression springs 27 applies reverse pressure to the fixed rod, so that the clamping effect of the multiple sets of blocks 13 on the fixed rod is better. Then the motor 18 is started to drive the active wheel 19 to rotate, and the transmission belt 21 drives the transmission wheel 20 and the transmission shaft 4, thereby driving the cutting blade 7 to rotate at high speed. Subsequently, the hydraulic cylinder 6 is extended and retracted to drive the articulated frame 5 and the support frame 2 to rotate, thereby driving the cutting blade 7 to cut the helmet.

[0040] When the locking cam 31 is unlocked, the locking cam 31 is unlocked and the locking cam 31 is in the unlocked state.

[0041] In all the schemes mentioned above, the connection between the two components can be selected according to actual conditions by welding, bolt and nut connection, bolt or screw connection or other well-known connection methods, which will not be listed here one by one. In the above, all fixed connections are preferably welded. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An improved helmet cutting machine, comprising a mounting frame (1), characterized in that: The mounting frame (1) is provided with a cutting mechanism, and the cutting mechanism comprises a support frame (2), a mounting sleeve (3), a transmission shaft (4), an articulated frame (5), a hydraulic cylinder (6), a cutting blade (7) and a transmission mechanism, wherein the support frame (2) is rotatably mounted on the top of the mounting frame (1), the mounting sleeve (3) is mounted on the top of the mounting frame (1), the transmission shaft (4) is rotatably mounted in the mounting sleeve (3), the articulated frame (5) is rotatably mounted on the lower end of the mounting frame (1), and the two ends of the hydraulic cylinder (6) are rotatably connected to the articulated frame (5) and the support frame (2), and the cutting blade (7) is mounted on one end of the transmission shaft (4) by means of a quick-install mechanism, and the transmission mechanism is arranged on the support frame (2). The assembly mechanism comprises an insert rod (8), a fixing sleeve (9), a fixing plate (10), a through hole (11), a slide rod (12), a block (13), a slot (14) and a push plate (15), wherein the insert rod (8) is arranged at one end of the transmission shaft (4), the fixing sleeve (9) is sleeved on the top end of the insert rod (8), the fixing plate (10) is arranged at the bottom end of the fixing sleeve (9), the through holes (11) are arranged in a plurality of groups distributed on the outer wall of the fixing sleeve (9), the slide rod (12) is arranged in a plurality of groups respectively slidably arranged in a plurality of groups of through holes (11), the block (13) is arranged at the bottom end of a plurality of groups of the slide rods (12), the slot (14) is arranged on the outer wall of the insert rod (8), and the push plate (15) is arranged in the fixing sleeve (9).

2. The improved helmet cutting machine according to claim 1, characterized in that: A material receiving hopper (16) is installed on the mounting frame (1), and a material discharging platform (17) is slidably installed on the material receiving hopper (16).

3. The improved helmet cutting machine according to claim 2, characterized in that: The transmission mechanism comprises a motor (18), a driving wheel (19), a transmission wheel (20) and a transmission belt (21); the motor (18) is mounted on a mounting frame (1); the driving wheel (19) is mounted on an output end of the motor (18); the transmission wheel (20) is mounted on one end of a transmission shaft (4); and the transmission belt (21) is mounted on outer walls of the driving wheel (19) and the transmission wheel (20).

4. The improved helmet cutting machine according to claim 3, characterized in that: The outer wall of the insertion rod (8) is provided with a limiting strip (22), and the inner wall of the fixing sleeve (9) is provided with a limiting groove (23). The limiting strips (22) and the limiting grooves (23) are both provided in multiple groups and are adapted to each other.

5. The improved helmet cutting machine according to claim 4 is characterized in that: multiple groups The through holes (11) are all provided with sliding grooves (24), the outer walls of the plurality of groups of sliding rods (12) are all provided with sliding bars (25), and the plurality of groups of sliding grooves (24) are slidably connected to the sliding bars (25).

6. The improved helmet cutting machine according to claim 5 is characterized in that: multiple groups The top of each slide rod (12) is provided with a ball block (26), and compression springs (27) are connected between multiple groups of the ball blocks (26) and the inner wall of the fixed sleeve (9). A compression spring (28) is connected between the push plate (15) and the inner top of the fixed sleeve (9).

7. The improved helmet cutting machine according to claim 6, characterized in that: The outer wall of the fixed sleeve (9) is provided with a locking mechanism, and the locking mechanism includes a locking sleeve (29), a locking groove (30), a limiting sleeve (31), a limiting hole (32), a rotating sleeve (33), a support rod (34) and a limiting block (35). The locking sleeve (29) is slidably mounted on the outer wall of the fixed sleeve (9), the locking groove (30) is arranged on multiple groups of the sliding rods (12), the limiting sleeve (31) is mounted on the bottom end of the locking sleeve (29), the limiting holes (32) are arranged in multiple groups distributed on the limiting sleeve (31), the rotating sleeve (33) is rotatably mounted on the outer wall of the fixed sleeve (9), the support rod (34) is arranged in multiple groups and is mounted on the top surface of the rotating sleeve (33), and the limiting blocks (35) are respectively mounted on the top ends of the multiple groups of the support rods (34).

8. The improved helmet cutting machine according to claim 7 is characterized in that: multiple groups The outer walls of the support rods (34) are each provided with a push spring (36), and the bottom ends of multiple groups of the push springs (36) are fixedly connected to the rotating sleeve (33).

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