CN221396400U - Non-stop winding device for flexographic printing machine - Google Patents

Abstract

The utility model discloses a non-stop winding device for a flexographic printing machine, and particularly relates to the technical field of flexographic printing. The utility model can carry out continuous machine and reel replacement, greatly improves the printing quality and the production efficiency of the whole equipment, realizes automation of tension control and feedback, saves time and reduces the operation difficulty.

Description

Non-stop winding device for flexographic printing machine

Technical Field

The utility model relates to the technical field of flexographic printing, in particular to a non-stop winding device for a flexographic printing machine.

Background

When continuously printing flexible products, the raw materials are generally rolled up by a rolling shaft, and then the rolling shaft is supported on unreeling equipment to unreel. There are currently two modes in printing unreeling devices: and (5) center rolling and friction rolling.

(1) And (3) center rolling: the device is a winding mode in which a motor is used for driving a ventilation expansion shaft to collect materials, and a tension sensor or a floating roller is used for guaranteeing tension between the ventilation expansion shaft and a traction device.

(2) Friction rolling: the winding mode is to use a motor to drive a friction roller and an air expansion shaft to generate friction force to collect materials, and to pass through a tension sensor or a floating roller to ensure tension between the traction device and the winding mode.

Defects and deficiencies of the prior art:

1. And (3) center rolling: the structure is simple and relatively simple, and the tension control is relatively simple and accurate; when the diameter of the defective coil is large or the weight is large, the power of the motor can be large;

2. Friction rolling: the structure is simple and easy to assemble; the disadvantage of rolls is that they are prone to frictional damage to the material or printed pattern.

Disclosure of utility model

The utility model aims to provide a non-stop winding device for a flexographic printing machine so as to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The utility model provides a flexible printing machine is with not shutting down coiling mechanism, includes receives the material wallboard, the bottom of receiving the material wallboard is provided with slide rail assembly, slide rail assembly's one end is provided with vibration rolling unit, the inboard one end of receiving the material wallboard is provided with roller group, the upper end of roller group is provided with rolling compression roller group, one side of rolling compression roller group is provided with the cut-off knife assembly, the one end of rolling compression roller group is provided with the dancer roll unit, one side of cut-off knife assembly is provided with big roller and trades a roll unit, one side of big roller trades a roll unit is provided with the air inflation axle switching unit, the one end of air inflation axle switching unit is provided with the unloading unit.

In a preferred embodiment, the slide rail assembly is including setting up in two rolling struts of receipts material wallboard inboard, two the gyro wheel is all installed to one side that the rolling strut kept away from each other, the intermediate position of gyro wheel is provided with the roller shaft, the roller shaft passes through the little round nut and installs on the rolling strut, the lower extreme of gyro wheel is provided with the rolling guide rail, two be provided with rolling guide rail adjustment vaulting pole between the rolling guide rail, the slide rail assembly is convenient for the product after unloading to derive.

In a preferred embodiment, the vibration rolling unit comprises a middle supporting block and a bottom plate, wherein the middle supporting block and the bottom plate are arranged on the inner side of the material receiving wallboard, an vibration rolling motor is fixedly arranged at the upper end of the bottom plate, the output end of the vibration rolling motor is connected with a worm and gear reducer, the output end of the worm and gear reducer is connected with an eccentric shaft fixing block through an eccentric shaft, the eccentric shaft fixing block is connected with the middle supporting block, and the vibration rolling unit can enable products to be wound in a vibration mode, so that the materials can be collected automatically.

In a preferred embodiment, the floating roller unit comprises a low friction cylinder, the telescopic end of the low friction cylinder is connected to a floating swing arm, a floating swing arm shaft is arranged at the upper end of the floating swing arm, two ends of the floating swing arm shaft penetrate through the floating swing arm and are fixedly connected with a first spherical ball bearing with a boss arranged at the outer end of the floating swing arm, a roller guide shaft is arranged at the lower end of the floating swing arm, a swing arm guide roller is arranged on the roller guide shaft, a floating swing arm guide roller is arranged on the floating swing arm shaft, a first expansion connecting sleeve is arranged on one side of the floating swing arm shaft, and a limiting frame and a limiting block are arranged on one side of the floating swing arm.

In a preferred implementation mode, the big roller trades a roll unit is including two drive cylinders, the flexible end connection direction rack fixed axle of drive cylinder, the one end setting of direction rack fixed axle is on receiving the material swing arm, two be provided with receipts material swing arm spacer between the receipts material swing arm, it is provided with the friction roller to receive the material swing arm inboard, the upper end of receiving the material swing arm is provided with the swing arm connecting block, the upper end of swing arm connecting block is provided with the inflatable shaft support, be connected with first inflatable shaft through inflatable shaft locking pin on the inflatable shaft support, one side of first inflatable shaft is provided with the straight line module mounting bracket, install the straight line module on the straight line module mounting bracket, the one end of straight line module is provided with first slim cylinder, one side fixed mounting of inflatable shaft support has servo motor, the lower extreme of inflatable shaft support is provided with the guide rack, bottom one side of guide rack is provided with cylindrical gear, the one end that the friction roller runs through receipts material pulley is connected with the rolling big.

In a preferred embodiment, the inflatable shaft switching unit comprises a speed reducer cushion block, one side of the speed reducer cushion block is fixedly provided with a speed reducer, an output shaft of the speed reducer is fixedly connected with a chain wheel shaft, a small chain wheel is fixedly arranged on the chain wheel shaft and is connected with a large chain wheel through chain transmission, one side of the large chain wheel is connected with an inflatable shaft swing arm through a swing arm gland, one end of the inflatable shaft swing arm is fixedly provided with a second thin cylinder, the telescopic end of the second thin cylinder is connected with an inflatable shaft fixing block, and a second inflatable shaft is arranged between the two inflatable shafts.

In a preferred embodiment, the unloading unit comprises a hydraulic cylinder support fixedly arranged on the side wall of the material receiving wallboard, a hydraulic cylinder is fixedly installed on the hydraulic cylinder support, a triangular plate is connected to the telescopic end of the hydraulic cylinder through an oil cylinder connecting pin shaft, one end of the triangular plate is rotatably arranged on the telescopic end of the fine-tuning hydraulic cylinder, one end of the fine-tuning hydraulic cylinder is arranged on a large rolling swing arm through a mounting seat, the upper end of the large rolling swing arm is connected with a second air expansion shaft through a bearing sleeve, one end of the large rolling swing arm is arranged on a large swing arm shaft, and the large swing arm shaft is connected with a second outer spherical ball bearing with a boss through a second air expansion connecting sleeve.

Compared with the prior art, the utility model has the beneficial effects that:

1. The application can carry out continuous machine and reel replacement, so that the printing quality and the production efficiency of the whole equipment are greatly improved, and the automation of tension control and feedback is realized, thereby saving time and reducing the operation difficulty;

2. The application has wide material thickness range, including paper, film, plastic, woven bag, etc. and can be used for printing various materials with different thicknesses according to the requirement;

3. The application can carry out high-speed material receiving, improves the printing efficiency, can carry out deviation correction control, better adapts to material change, has convenient and simple material receiving, good structural rigidity of the machine, stable service performance and simple structure.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of a sliding rail assembly according to the present utility model;

FIG. 3 is a schematic diagram of an oscillating winding unit according to the present utility model;

FIG. 4 is a schematic view of a dancer unit of the present utility model;

FIG. 5 is a schematic view of the construction of a large roll change unit of the present utility model;

FIG. 6 is a schematic diagram of the structure of the inflatable shaft switching unit of the present utility model;

fig. 7 is a schematic view of the structure of the discharging unit of the present utility model.

In the figure: 1. receiving a wallboard; 2. a slide rail assembly; 201. rolling up a supporting file; 202. rolling the guide rail; 203. winding a guide rail adjusting stay bar; 204. a roller; 205. a roller shaft; 206. a small round nut; 3. an oscillation winding unit; 301. a middle stay; 302. a bottom plate; 303. oscillating a winding motor; 304. a worm gear reducer; 305. an eccentric shaft; 306. an eccentric shaft fixing block; 4. winding a compression roller group; 5. a discharging unit; 501. a hydraulic cylinder support; 502. a hydraulic cylinder; 503. a triangle; 504. the oil cylinder is connected with the pin shaft; 505. fine tuning a hydraulic cylinder; 506. a mounting base; 507. winding a large swing arm; 508. a bearing sleeve; 509. a large swing arm shaft; 510. the second expansion connecting sleeve; 511. the second outer spherical ball bearing with a boss; 6. a cutter assembly; 7. a floating roller unit; 701. a low friction cylinder; 702. a swing arm floats; 703. a floating swing arm shaft; 704. a first outer spherical ball bearing with a boss; 705. a roller guide shaft; 706. swing arm guide roller; 707. a floating swing arm guide roller; 708. the first expansion connecting sleeve; 709. a limiting frame; 710. a limiting block; 8. a large roll changing unit; 801. a driving cylinder; 802. a guide rack fixing shaft; 803. receiving a material swing arm; 804. a material receiving swing arm supporting block; 805. a friction roller; 806. a swing arm connecting block; 807. an air expansion shaft support; 808. the air expansion shaft locks the pin shaft; 809. a first inflatable shaft; 810. a linear module mounting rack; 811. a linear module; 812. a first thin cylinder; 813. a servo motor; 814. a guide rack; 815. a cylindrical gear; 816. winding a large belt wheel; 9. an air expansion shaft switching unit; 901. cushion blocks of the speed reducer; 902. a speed reducer; 903. chain wheel shaft; 904. a small sprocket; 905. a chain; 906. a large sprocket; 907. swing arm gland; 908. an inflatable shaft swing arm; 909. a second thin cylinder; 910. an inflatable shaft fixing block; 911. a second inflatable shaft; 10. and (5) passing through a roller set.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-7, the utility model provides a non-stop winding device for a flexographic printing machine, which has the following technical scheme:

The utility model provides a flexible printing machine is with not shutting down coiling mechanism, includes receives material wallboard 1, the bottom of receiving material wallboard 1 is provided with slide rail assembly 2, slide rail assembly 2's one end is provided with vibration rolling unit 3, the inboard one end of receiving material wallboard 1 is provided with roller set 10, the upper end of roller set 10 is provided with rolling compression roller set 4, one side of rolling compression roller set 4 is provided with cutter assembly 6, the one end of rolling compression roller set 4 is provided with dancer roll unit 7, one side of cutter assembly 6 is provided with big roller change unit 8, one side of big roller change unit 8 is provided with inflatable shaft switching unit 9, the one end of inflatable shaft switching unit 9 is provided with discharge unit 5.

In a preferred embodiment, the sliding rail assembly 2 includes two rolling supporting members 201 disposed on the inner side of the material receiving wallboard 1, two rolling supporting members 201 are respectively mounted with a roller 204 on a side far away from each other, a roller shaft 205 is disposed in a middle position of the roller 204, the roller shaft 205 is mounted on the rolling supporting members 201 through a small round nut 206, a rolling guide rail 202 is disposed at a lower end of the roller 204, and a rolling guide rail adjusting supporting rod 203 is disposed between the two rolling guide rails 202.

Referring to fig. 2 specifically, the roller 204 moves on the winding rail 202, and the discharged product falls on the winding stay 201, so as to facilitate automatic collection of discharged product.

In a preferred embodiment, the oscillating winding unit 3 includes a middle supporting block 301 and a bottom plate 302 disposed inside the material receiving wallboard 1, an oscillating winding motor 303 is fixedly mounted at the upper end of the bottom plate 302, an output end of the oscillating winding motor 303 is connected with a worm gear reducer 304, an output end of the worm gear reducer 304 is connected with an eccentric shaft fixing block 306 through an eccentric shaft 305, and the eccentric shaft fixing block 306 is connected with the middle supporting block 301.

Specifically, referring to fig. 3, after the oscillating winding motor 303 is started, the oscillating winding motor can be decelerated by the worm gear reducer 304 to drive the eccentric shaft 305 to rotate, and the eccentric shaft 305 can continuously strike the slide rail assembly 2, so that the discharged product can roll on the slide rail assembly 2.

In a preferred embodiment, the floating roller unit 7 includes a low friction cylinder 701, a telescopic end of the low friction cylinder 701 is connected to a floating swing arm 702, a floating swing arm shaft 703 is disposed at an upper end of the floating swing arm 702, two ends of the floating swing arm shaft 703 penetrate through the floating swing arm 702 and are fixedly connected with a first spherical ball bearing 704 with a boss disposed at an outer end of the floating swing arm 702, a guide roller shaft 705 is disposed at a lower end of the floating swing arm 702, a swing arm guide roller 706 is disposed on the guide roller shaft 705, a floating swing arm guide roller 707 is disposed on the floating swing arm shaft 703, a first expansion connecting sleeve 708 is disposed on one side of the floating swing arm shaft 703, and a limit frame 709 and a limit block 710 are disposed on one side of the floating swing arm 702.

Specifically, referring to fig. 4, after the low friction air cylinder 701 is opened, the floating swing arm 702 can be driven to swing, and when the floating swing arm 702 swings, the floating swing arm guide roller 707 and the swing arm guide roller 706 can float up and down.

In a preferred embodiment, the large roll changing unit 8 includes two driving cylinders 801, the telescopic ends of the driving cylinders 801 are connected with a guide rack fixing shaft 802, one end of the guide rack fixing shaft 802 is disposed on a material receiving swing arm 803, two material receiving swing arm brackets 804 are disposed between the material receiving swing arm 803, friction rolls 805 are disposed on the inner sides of the material receiving swing arm 803, swing arm connecting blocks 806 are disposed on the upper ends of the material receiving swing arm 803, air expansion shaft supports 807 are disposed on the upper ends of the swing arm connecting blocks 806, first air expansion shafts 809 are connected to the air expansion shaft supports 807 through air expansion shaft locking pins 808, a linear module mounting frame 810 is disposed on one side of the first air expansion shaft 809, a linear module 811 is mounted on the linear module mounting frame 810, a first thin cylinder 812 is disposed on one side of the air expansion shaft supports 807, a guide rack 814 is disposed on the lower end of the air expansion shaft supports 807, a cylindrical gear 815 is disposed on one side of the bottom ends of the guide rack 814, and one end of the air expansion shaft support 803 is connected with the large roll winding pulleys 803.

Specifically, referring to fig. 5, the first thin air cylinder 812 can drive the linear module 811 on the linear module mounting frame 810, and the driving air cylinder 801 can drive the material receiving swing arm 803 to swing, and when the material receiving swing arm 803 swings, the friction roller 805 and the first air expansion shaft 809 can be driven to swing, so that the first air expansion shaft 809 swings to the unloading unit, and the first air expansion shaft 809 is unloaded by the swing arm on the unloading unit 5.

In a preferred embodiment, as shown in fig. 6, the air-expanding shaft switching unit 9 includes a speed reducer pad 901, a speed reducer 902 is fixedly installed on one side of the speed reducer pad 901, an output shaft of the speed reducer 902 is fixedly connected with a sprocket shaft 903, a small sprocket 904 is fixedly arranged on the sprocket shaft 903, the small sprocket 904 is connected with a large sprocket 906 through a chain 905 in a transmission manner, one side of the large sprocket 906 is connected with an air-expanding shaft swinging arm 908 through a swinging arm gland 907, a second thin air cylinder 909 is fixedly installed at one end of the air-expanding shaft swinging arm 908, a second air-expanding shaft 911 is installed between the two air-expanding shafts 910, the speed reducer 902 drives the sprocket shaft 903 to rotate, the small sprocket 904 can be driven to rotate when the sprocket shaft 903 rotates, the large sprocket 906 can be driven to swing through the chain 905, thereby the air-expanding shaft swinging arm 908 can be driven to swing to a proper position by the air-expanding shaft swinging arm 908, and the second air-expanding shaft can be automatically opened after the second air-expanding shaft swinging arm 908 is swung to a proper position, and the second air-expanding shaft is automatically opened.

In a preferred embodiment, as shown in fig. 7, the discharging unit 5 includes a hydraulic cylinder support 501 fixedly disposed on a side wall of the receiving wallboard 1, a hydraulic cylinder 502 is fixedly mounted on the hydraulic cylinder support 501, a triangle 503 is connected to a telescopic end of the hydraulic cylinder 502 through a cylinder connection pin 504, one end of the triangle 503 is rotatably disposed on a telescopic end of the fine tuning hydraulic cylinder 505, one end of the fine tuning hydraulic cylinder 505 is disposed on a large winding swing arm 507 through a mounting seat 506, an upper end of the large winding swing arm 507 is connected with a second air expansion shaft 911 through a bearing sleeve 508, one end of the large winding swing arm 507 is disposed on a large swing arm shaft 509, the large swing arm shaft 509 is connected with a second spherical ball bearing 511 with a boss through a second expansion connection sleeve 510, the large winding swing arm 507 can be driven to rotate around the large swing arm shaft 509 by the triangle 503 after the hydraulic cylinder 502 is opened, so that the large winding swing arm 507 drives the second air expansion shaft to swing, and the position of the triangle 503 can be adjusted by the fine tuning hydraulic cylinder 505, and the large winding swing arm 507 swings greatly.

The working principle of the utility model is as follows: the air expansion shaft is penetrated in the roll core, and the position of the material roll on the air expansion shaft is determined according to the position of the printing plate. The roll changing mechanical arm returns to the top preparation position and is put into the inflatable shaft. When the material is received in the former coil stock, locking the air-expanding shaft, simultaneously, the cutter presses the material in the roll, the cutter works to cut off the material belt, the air-expanding shaft is pressed down to a working position, and the second coil stock is started. While the first roll of material has been received. The driving air cylinder in the large roll changing unit 8 is sent to the swing arm in the discharging unit 5, and the first roll material is discharged from the lower hem of the large winding swing arm 507 in the discharging unit 5; meanwhile, the left pressing arm cylinder and the right pressing arm cylinder return to an initial state to prepare for receiving the next roll of material, meanwhile, the manipulator rotates ninety degrees and the left pressing arm and the right pressing arm exchange control of the material roll, and the manipulator returns to a preparation position to prepare for the next material change after the handover is completed.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. The utility model provides a flexography machine is with not shutting down coiling mechanism, includes receipts material wallboard (1), its characterized in that: the bottom of the material receiving wallboard (1) is provided with a sliding rail component (2), one end of the sliding rail component (2) is provided with an oscillation rolling unit (3), one end of the inner side of the material receiving wallboard (1) is provided with a roller passing group (10), the upper end of the roller passing group (10) is provided with a rolling press roller group (4), one side of the rolling press roller group (4) is provided with a cutter component (6), one end of the winding compression roller set (4) is provided with a floating roller unit (7), one side of the cutter assembly (6) is provided with a large roller reel changing unit (8), one side of the large roller reel changing unit (8) is provided with an air expansion shaft switching unit (9), and one end of the air expansion shaft switching unit (9) is provided with a discharging unit (5).

2. The non-stop winding device for a flexographic printing machine according to claim 1, wherein: the sliding rail assembly (2) comprises two rolling supporting rails (201) arranged on the inner side of a material collecting wallboard (1), rollers (204) are arranged on one sides, away from each other, of the rolling supporting rails (201), roller shafts (205) are arranged in the middle of the rollers (204), the roller shafts (205) are arranged on the rolling supporting rails (201) through small round nuts (206), rolling guide rails (202) are arranged at the lower ends of the rollers (204), and rolling guide rail adjusting supporting rods (203) are arranged between the rolling guide rails (202).

3. The non-stop winding device for a flexographic printing machine according to claim 1, wherein: the oscillating winding unit (3) comprises a middle supporting block (301) and a bottom plate (302) which are arranged on the inner side of the material collecting wallboard (1), an oscillating winding motor (303) is fixedly arranged at the upper end of the bottom plate (302), the output end of the oscillating winding motor (303) is connected with a worm gear reducer (304), the output end of the worm gear reducer (304) is connected with an eccentric shaft fixing block (306) through an eccentric shaft (305), and the eccentric shaft fixing block (306) is connected with the middle supporting block (301).

4. The non-stop winding device for a flexographic printing machine according to claim 1, wherein: the floating roll unit (7) comprises a low-friction air cylinder (701), the telescopic end of the low-friction air cylinder (701) is connected to a floating swing arm (702), a floating swing arm shaft (703) is arranged at the upper end of the floating swing arm (702), two ends of the floating swing arm shaft (703) penetrate through the floating swing arm (702) to be arranged, and are fixedly connected with a first boss spherical ball bearing (704) arranged at the outer end of the floating swing arm (702), a guide roll shaft (705) is arranged at the lower end of the floating swing arm (702), a swing arm guide roll (706) is arranged on the guide roll shaft (705), a floating swing arm guide roll (707) is arranged on the floating swing arm shaft (703), a first expansion connecting sleeve (708) is arranged on one side of the floating swing arm (703), and a limiting frame (709) and a limiting block (710) are arranged on one side of the floating swing arm (702).

5. The non-stop take-up device for a flexographic printing machine according to claim 4, wherein: the large roll reel changing unit (8) comprises two driving cylinders (801), the telescopic ends of the driving cylinders (801) are connected with a guide rack fixing shaft (802), one end of the guide rack fixing shaft (802) is arranged on a material receiving swing arm (803), material receiving swing arm supporting blocks (804) are arranged between the two material receiving swing arms (803), friction rolls (805) are arranged on the inner sides of the material receiving swing arms (803), swing arm connecting blocks (806) are arranged at the upper ends of the material receiving swing arms (803), an air expansion shaft support (807) is arranged at the upper ends of the swing arm connecting blocks (806), a first air expansion shaft (809) is connected to the air expansion shaft support (807) through an air expansion shaft locking pin shaft (808), a linear module mounting frame (810) is arranged on one side of the first air expansion shaft (809), a linear module (811) is arranged on the linear module mounting frame (810), a first thin cylinder (812) is arranged at one side of the linear module (811), a servo motor (813) is fixedly arranged on one side of the air expansion shaft support (814), a guide rack (815) is arranged at one side of the air expansion shaft support (814), one end of the friction roller (805) penetrating through the material receiving swing arm (803) is connected with a large winding belt wheel (816).

6. The non-stop winding device for a flexographic printing machine according to claim 1, wherein: the air-expanding shaft switching unit (9) comprises a speed reducer cushion block (901), one side of the speed reducer cushion block (901) is fixedly provided with a speed reducer (902), an output shaft of the speed reducer (902) is fixedly connected with a chain wheel shaft (903), a small chain wheel (904) is fixedly arranged on the chain wheel shaft (903), the small chain wheel (904) is connected with a large chain wheel (906) through a chain (905) transmission, one side of the large chain wheel (906) is connected with an air-expanding shaft swing arm (908) through a swing arm gland (907), one end of the air-expanding shaft swing arm (908) is fixedly provided with a second thin cylinder (909), the telescopic end of the second thin cylinder (909) is connected with an air-expanding shaft fixing block (910), and a second air-expanding shaft (911) is arranged between the two air-expanding shaft fixing blocks (910).

7. The non-stop take-up device for a flexographic printing machine according to claim 6, wherein: the unloading unit (5) comprises a hydraulic cylinder support (501) fixedly arranged on the side wall of the material collecting wallboard (1), a hydraulic cylinder (502) is fixedly arranged on the hydraulic cylinder support (501), a triangular plate (503) is connected to the telescopic end of the hydraulic cylinder (502) through an oil cylinder connecting pin shaft (504), one end of the triangular plate (503) is rotatably arranged on the telescopic end of the fine-tuning hydraulic cylinder (505), one end of the fine-tuning hydraulic cylinder (505) is arranged on a large rolling swing arm (507) through an installing seat (506), the upper end of the large rolling swing arm (507) is connected with a second air expansion shaft (911) through a bearing sleeve (508), one end of the large rolling swing arm (507) is arranged on a large swing arm shaft (509), and the large rolling swing arm shaft (509) is connected with a second outer spherical ball bearing (511) with a boss through a second expansion connecting sleeve (510).