Liftable ball feeding platform for volleyball training

By designing a ball supply device and a volleyball hoist that can lift the ball feeding platform, the existing ball feeding platform takes up space and cumbersome ball picking problem is solved, and an efficient and convenient volleyball ball picking process is achieved, and the efficiency and adaptability of volleyball training is improved.

CN222829033UActive Publication Date: 2025-05-06MINXI VOCATIONAL & TECHN COLLEGE
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420829392.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-19
Publication Date
2025-05-06
Estimated Expiration
2034-04-19

AI Technical Summary

Technical Problem

In volleyball training, the existing ball feeding platform has fatigue and low training efficiency due to the ball storage box occupying space and the ball picking process.

Method used

A liftable ball feeding platform is designed, and the volleyball is placed in the volleyball placement frame assembly using a ball feeding device. The volleyball ball is lifted to the movable ball feeding platform assembly through a volleyball hoist, which is convenient for ball picking, and the movable ball feeding platform assembly can be moved vertically to adapt to ball feeding personnel of different heights.

Benefits of technology

The device does not occupy platform space, facilitates ball pickup, reduces fatigue of ball feeders, and improves training efficiency and flexibility.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222829033U_ABST
    Figure CN222829033U_ABST
Patent Text Reader

Abstract

The utility model relates to a liftable ball feeding platform for volleyball training. The liftable ball feeding platform comprises a bottom plate, rollers, a lifting platform, a controller and a ball supply device, the ball supply device is arranged, volleyballs are lifted to the movable ball supply table assembly through a volleyball lifting machine, ball taking is facilitated, the platform space is not occupied, a ball supply table of the movable ball supply table assembly can be vertically moved and adjusted so as to adapt to ball feeding personnel of different heights, the volleyballs on the ball supply table are sensed through a first infrared sensor, and the ball feeding personnel can conveniently feed the volleyballs through a second infrared sensor. When no ball exists on the ball supply table, the volleyball lifting machine is controlled to lift and supply the volleyballs, when the volleyball lifting machine operates, the transmission assembly drives the rotating roller and the ball pushing plate to rotate synchronously, the ball pushing plate rotates to push the volleyballs in the ball inlet channel to move rightwards, and when the ball pushing plate does not rotate, the volleyballs in the ball inlet channel are blocked. The volleyballs enter the volleyball elevator in order, and the volleyballs are prevented from being accumulated at an inlet of the volleyball elevator.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of volleyball training, in particular to a liftable ball feeding platform for volleyball training. Background Art

[0002] Volleyball is a ball sport. The court is rectangular with a high net in the middle. The two teams (six players on each side) each occupy one side of the court. The players use their hands to hit the ball over the net. The ball used in volleyball is made of sheepskin or artificial leather as the shell and rubber as the bladder. It is similar in size to a football.

[0003] During volleyball training, the ball feeder uses a ball feeding platform to raise his own height for training the players. A ball storage box is placed on the platform to facilitate the ball feeder to take the ball. The ball storage box occupies the platform space, and the ball feeder needs to bend down and reach into the ball storage box to take the ball when taking the ball, which is rather troublesome. At the same time, repeated bending can easily cause fatigue and is not convenient to continue. At the same time, when there is no ball in the ball storage box, the platform needs to be lowered to take a replacement ball. This process takes a long time, which can easily affect the training time and efficiency. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above technical problems, the utility model provides a liftable ball feeding platform for volleyball training. By providing a ball supply device, the required volleyball is placed in a volleyball placement frame assembly, and the volleyball is lifted to the movable ball supply table assembly by a volleyball lifter, which is convenient for taking the ball without occupying the platform space. The ball supply table of the movable ball supply table assembly can be moved and adjusted vertically to accommodate ball feeders of different heights.

[0006] (II) Technical solution

[0007] Based on this, the utility model provides the following technical solutions: a liftable ball feeding platform for volleyball training, comprising a base plate and a ball supply device, wherein a roller is installed at the bottom end of the base plate, a lifting platform is installed at the right side of the top of the base plate, a controller is installed at the left edge of the top of the base plate, and the ball supply device is installed on the left side of the top of the base plate, the ball supply device comprises a volleyball elevator, a movable ball supply table assembly, an infrared sensor 1, a transmission assembly, a motor 1 and a volleyball placement frame assembly, a movable ball supply table assembly is installed at the top right side of the volleyball elevator, an infrared sensor 1 is installed on the movable ball supply table assembly, and the infrared sensor 1 is used to sense the supply situation of volleyballs, a volleyball placement frame assembly is installed at the bottom left side of the volleyball elevator, the front bottom end of the transmission assembly is transmission-connected to the output shaft of the motor 1, and the left and right sides of the rear end of the transmission assembly are transmission-connected to the volleyball placement frame assembly and the volleyball elevator respectively, and the bottom ends of the volleyball elevator, the motor 1 and the volleyball placement frame assembly are all fixedly connected to the base plate.

[0008] Preferably, the volleyball elevator includes an outer shell, a conveyor belt, a driving wheel, a driven wheel and a lifting plate, the conveyor belt is arranged inside the outer shell, the driven wheel and the driving wheel are respectively arranged on the upper and lower sides of the inner side of the conveyor belt, and the conveyor belt is transmission-connected to the driven wheel and the driving wheel, a lifting plate is fixed to the outer wall of the conveyor belt, the left bottom of the outer shell is connected to the volleyball placement frame assembly, and the right top of the outer shell is connected to the movable ball supply table assembly.

[0009] Preferably, the movable ball supply table assembly includes a guide frame, a movable frame, a ball supply table, a movable gear rod, a fixed gear rod, a screw, a support plate and a motor 2. A movable frame is provided at the bottom of the guide frame, and the bottom end surface of the movable frame is fixedly connected to the ball supply table. A movable gear rod is fixed to the right side of the top of the movable frame, and fixed gear rods are vertically penetrated on the front, rear and left sides of the interior of the movable frame. The top of the movable gear rod vertically penetrates the right side wall of the guide frame, the top of the fixed gear rod is fixedly connected to the guide frame, and the bottom end of the fixed gear rod is fixedly connected to the support plate, the screw vertically penetrates the front side wall of the movable frame, and the movable frame is threadedly connected to the screw, the bottom end of the screw is drivingly connected to the output shaft of the motor 2, the motor 2 is installed at the bottom of the support plate, the left side of the support plate is fixedly connected to the outer shell, the left end of the guide frame is connected to the right top end of the outer shell, and the guide frame is connected to the outer shell, and the infrared sensor 1 is installed at the bottom of the ball supply table.

[0010] Preferably, the volleyball placement frame assembly includes a placement frame, a goal channel, a protective shell, a rotating roller, a ball pushing plate and two infrared sensors; the bottom end of the placement frame is connected to the goal channel, a protective shell is fixed to the right side of the top of the goal channel, the left and right sides of the top of the goal channel are respectively connected to the placement frame and the protective shell, a rotating roller is arranged inside the protective shell, a ball pushing plate is arranged on the outer wall of the rotating roller, two infrared sensors are installed in the middle of the bottom end of the goal channel, the two infrared sensors are used to sense the volleyball inside the goal channel, the goal channel is connected to the left bottom of the outer shell, and the goal channel is connected to the outer shell, and the rotating roller is transmission-connected to the transmission assembly.

[0011] Preferably, the movable lever, the fixed lever and the screw rod are all arranged vertically.

[0012] Preferably, the ball supply table is inclined downward from left to right, and a baffle is provided at the right edge of the ball supply table.

[0013] Preferably, the ball pushing plates are arranged in a ring array on the outer wall of the rotating roller, and the spacing distance at the edges of the ball pushing plates is greater than the diameter of the volleyball.

[0014] Preferably, the transmission assembly includes a synchronous wheel set and a gear set, the synchronous wheel on the left side of the synchronous wheel set is transmission connected to the gear on the right side of the gear set, the gear on the left side of the gear set is transmission connected to the rotating roller, the front side of the synchronous wheel on the right side of the synchronous wheel set is transmission connected to the output shaft of motor one, and the rear side of the synchronous wheel on the right side of the synchronous wheel set is transmission connected to the driving wheel through a transmission shaft.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a liftable ball feeding platform for volleyball training, which has the following beneficial effects:

[0017] The liftable ball feeding platform for volleyball training is provided with a ball supply device, and the required volleyball is placed in a volleyball placing frame component, and the volleyball is lifted to the movable ball supply platform component by a volleyball lifter, so that the ball can be taken easily without occupying the platform space;

[0018] The present invention relates to a liftable ball feeding platform for volleyball training. The ball feeding platform of the movable ball feeding platform assembly can be vertically moved and adjusted to accommodate ball feeding personnel of different heights. The volleyball on the ball feeding platform is sensed by a pair of infrared sensors. When there is no ball on the ball feeding platform, the volleyball elevator is controlled to lift the volleyball to supply the volleyball. When the volleyball elevator is in operation, the transmission assembly drives the rotating roller and the ball pushing plate to rotate synchronously. The ball pushing plate rotates to push the volleyball in the goal channel to move right. When the ball pushing plate does not rotate, the volleyball in the goal channel is blocked, so that the volleyball enters the volleyball elevator in an orderly manner, and the volleyball is prevented from piling up at the entrance of the volleyball elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the ball supply device of the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the volleyball hoist of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the mobile ball table assembly of the utility model;

[0023] Figure 5 This is a schematic diagram of the internal structure of the volleyball placement frame assembly of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the transmission component of the utility model.

[0025] In the figure: bottom plate 1, roller 2, lifting platform 3, controller 4, ball supply device 5, volleyball lift 51, movable ball supply table assembly 52, infrared sensor 1-53, transmission assembly 54, motor 1-55, volleyball placement frame assembly 56, shell 511, conveyor belt 512, driving wheel 513, driven wheel 514, lifting plate 515, guide frame 521, movable frame 522, ball supply table 523, movable gear lever 524, fixed gear lever 525, screw 526, support plate 527, motor 2-528, placement frame 561, goal channel 562, protective shell 563, rotating roller 564, ball pushing plate 565, infrared sensor 2-566, synchronous wheel group 541, gear group 542. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1 and Figure 2 A liftable ball feeding platform for volleyball training includes a bottom plate 1 and a ball supply device 5. A roller 2 is installed at the bottom end of the bottom plate 1. A lifting platform 3 is installed on the top right side of the bottom plate 1. A controller 4 is installed at the top left edge of the bottom plate 1. The ball supply device 5 is installed on the top left side of the bottom plate 1. The ball supply device 5 includes a volleyball hoist 51, a movable ball supply table assembly 52, an infrared sensor 53, a transmission assembly 54, a motor 55 and a volleyball placement frame assembly 56. The movable ball supply table is installed on the top right side of the volleyball hoist 51. Component 52, an infrared sensor 53 is installed on the movable ball supply table component 52, the infrared sensor 53 is used to sense the supply situation of volleyballs, a volleyball placement frame component 56 is installed on the left bottom of the volleyball elevator 51, the front bottom end of the transmission component 54 is connected to the output shaft of the motor 55, the left and right sides of the rear end of the transmission component 54 are connected to the volleyball placement frame component 56 and the volleyball elevator 51 respectively, the bottom ends of the volleyball elevator 51, the motor 55 and the volleyball placement frame component 56 are fixedly connected to the bottom plate 1.

[0028] See also Figure 3The volleyball elevator 51 includes a shell 511, a conveyor belt 512, a driving wheel 513, a driven wheel 514 and a lifting plate 515. The conveyor belt 512 is arranged inside the shell 511, and the driven wheel 514 and the driving wheel 513 are arranged on the upper and lower sides of the inner side of the conveyor belt 512 respectively, and the conveyor belt 512 is transmission-connected with the driven wheel 514 and the driving wheel 513. The outer wall of the conveyor belt 512 is fixed with a lifting plate 515. The left bottom of the shell 511 is connected to the volleyball placement frame assembly 56, and the right top of the shell 511 is connected to the movable ball supply table assembly 52.

[0029] See also Figure 4 The movable ball supply table assembly 52 includes a guide frame 521, a movable frame 522, a ball supply table 523, a movable lever 524, a fixed lever 525, a screw 526, a support plate 527 and a motor 528. The bottom of the guide frame 521 is provided with a movable frame 522, the bottom end surface of the movable frame 522 is fixedly connected to the ball supply table 523, the top right side of the movable frame 522 is fixed with a movable lever 524, and the interior of the movable frame 522 is vertically penetrated by fixed levers on both the front and rear sides and the left side. The top of the movable lever 524 vertically penetrates the right side wall of the guide frame 521, the top of the fixed lever 525 is fixedly connected to the guide frame 521, and the bottom end of the fixed lever 525 is fixedly connected to the support plate 527, the screw 526 vertically penetrates the front side wall of the movable frame 522, and the movable frame 522 is threadedly connected to the screw 526, and the bottom end of the screw 526 is drivingly connected to the output shaft of the motor 2 528, and the motor 2 528 is installed at the bottom of the support plate 527, and the support plate The left side of 527 is fixedly connected to the housing 511, the left end of the guide frame 521 is connected to the top of the right side of the housing 511, and the guide frame 521 is connected to the housing 511. The infrared sensor 53 is installed at the bottom of the ball supply table 523. The movable lever 524, the fixed lever 525 and the screw 526 are all arranged vertically, so that the screw 526 rotates to drive the movable frame 522 to move vertically along the fixed baffle 525, and the movable frame 522 drives the movable lever 524 along the guide frame 5 21 slides vertically in the right wall, and forms a limit frame through the movable gear rod 524, the fixed gear rod 525 and the screw rod 526 to guide the volleyball from falling from the guide frame 521 to the movable frame 522 to prevent the volleyball from falling out from between the guide frame 521 and the movable frame 522. The ball supply table 523 is tilted downward from left to right, and a baffle is provided at the right edge of the ball supply table 523, so that after the volleyball falls onto the ball supply table 523, it rolls to the right, which is convenient for people on the lifting platform 3 to pick it up.

[0030] See also Figure 5The volleyball placement frame assembly 56 includes a placement frame 561, a goal channel 562, a protective shell 563, a rotating roller 564, a ball pushing plate 565 and an infrared sensor 566. The bottom end of the placement frame 561 is connected to the goal channel 562. A protective shell 563 is fixed to the right side of the top of the goal channel 562. The top left and right sides of the goal channel 562 are respectively connected to the placement frame 561 and the protective shell 563. A rotating roller 564 is arranged inside the protective shell 563. A ball pushing plate 565 is arranged on the outer wall of the rotating roller 564. An infrared sensor 566 is installed in the middle of the bottom end of the goal channel 562. The infrared sensor 566 is used to sense the volleyball inside the goal channel 562. The goal channel 562 is connected to the left bottom of the shell 511, and the goal channel 562 is connected to the shell 511. The rotating roller 564 is connected to the transmission assembly 54 in transmission connection.

[0031] The ball pushing plates 565 are arranged in a circular array on the outer wall of the rotating roller 564, and the distance between the edges of the ball pushing plates 565 is greater than the diameter of the volleyball, so that the rotation of the rotating roller 564 drives the ball pushing plates 565 to rotate, and the volleyball in the goal channel 562 is pushed to the right by the rotation of the ball pushing plates 565, and when the ball pushing plates 565 do not rotate, the volleyball in the goal channel 562 is blocked.

[0032] See also Figure 6 The transmission assembly 54 includes a synchronous wheel set 541 and a gear set 542. The synchronous wheel on the left side of the synchronous wheel set 541 is connected to the gear on the right side of the gear set 542. The gear on the left side of the gear set 542 is connected to the rotating roller 564. The front side of the synchronous wheel on the right side of the synchronous wheel set 541 is connected to the output shaft of the motor 55. The rear side of the synchronous wheel on the right side of the synchronous wheel set 541 is connected to the driving wheel 513 through a transmission shaft.

[0033] In summary, when in use, the device is first moved to a desired position via the roller 2, and then the volleyball is placed in the placement frame 561;

[0034] The control motor 1 55 generates power to drive the synchronous wheel set 541 of the transmission assembly 54. The synchronous wheel on the right side of the synchronous wheel set 541 drives the driving wheel 513 of the volleyball hoist 51 to rotate clockwise, and the synchronous wheel on the left side of the synchronous wheel set 541 drives the gear set 542. The gear set 542 drives the rotating roller 564 to rotate counterclockwise, so that the driving wheel 513 and the rotating roller 564 rotate synchronously;

[0035] The volleyball in the placement frame 561 falls into the goal channel 562. When the ball pushing plate 565 does not rotate, the volleyball in the goal channel 562 is blocked. The rotating roller 564 rotates to drive the ball pushing plate 565 to rotate. The ball pushing plate 565 rotates to push the volleyball in the goal channel 562 to move right and fall onto the lifting plate 515 on the left side of the volleyball elevator 51. At the same time, the driving wheel 513 rotates to drive the lifting plate 515 on the left side to move upward, lift the volleyball upward, and lift it to the guide frame 521 and fall out.

[0036] The guide frame 521 guides the lifted volleyball to fall onto the ball supply table 523, and generates power through the driving motor 2 528 to drive the screw 526 to rotate. The screw 526 rotates and drives the movable frame 522 to move vertically through the threaded fit between the screw and the movable frame 522. The movable frame 522 drives the ball supply table 523 to move synchronously, and the height of the ball supply table 523 is adjusted to accommodate ball feeders of different heights. The ball feeders stand on the lifting platform 3 to take the volleyball on the ball supply table 52.

[0037] The volleyball on the ball supply table 523 is sensed by the infrared sensor 53. When there is no ball on the ball supply table 523, the volleyball lifting machine 51 is controlled to lift the volleyball to supply the volleyball. The volleyball on the left side of the goal channel 562 is sensed by the infrared sensor 566. When there is no ball in the goal channel 562, a prompt is given so that the volleyball can be added in time.

[0038] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

[0039] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liftable ball feeding platform for volleyball training, comprising a bottom plate (1), a roller (2) being installed at the bottom end of the bottom plate (1), a lift platform (3) being installed at the right side of the top end of the bottom plate (1), and a controller (4) being installed at the left edge of the top of the bottom plate (1); Features: The volleyball hoist (51) further comprises a ball supply device (5), the ball supply device (5) being mounted on the left side of the top end of the bottom plate (1), the ball supply device (5) comprising a volleyball hoist (51), a movable ball supply table assembly (52), an infrared sensor (53), a transmission assembly (54), a motor (55) and a volleyball placement frame assembly (56), the movable ball supply table assembly (52) being mounted on the top right side of the volleyball hoist (51), the infrared sensor (53) being mounted on the movable ball supply table assembly (52), and the infrared sensor (53) being mounted on the movable ball supply table assembly (52). The sensor (53) is used to sense the supply of volleyballs. A volleyball placement frame assembly (56) is installed at the left bottom of the volleyball elevator (51). The front bottom end of the transmission assembly (54) is connected to the output shaft of the motor (55). The left and right sides of the rear end of the transmission assembly (54) are connected to the volleyball placement frame assembly (56) and the volleyball elevator (51) respectively. The bottom ends of the volleyball elevator (51), the motor (55) and the volleyball placement frame assembly (56) are fixedly connected to the bottom plate (1).

2. A liftable ball feeding platform for volleyball training according to claim 1, characterized in that: The volleyball lift (51) comprises a shell (511), a conveyor belt (512), a driving wheel (513), a driven wheel (514) and a lifting plate (515). The shell (511) is provided with a conveyor belt (512). The inner sides of the conveyor belt (512) are provided with a driven wheel (514) and a driving wheel (513) respectively. The conveyor belt (512) is transmission-connected to the driven wheel (514) and the driving wheel (513). The outer wall of the conveyor belt (512) is fixed with a lifting plate (515). The left bottom of the shell (511) is connected to the volleyball placement frame assembly (56), and the right top of the shell (511) is connected to the movable ball supply table assembly (52).

3. The liftable ball feeding platform for volleyball training according to claim 1, characterized in that: The movable ball supply table assembly (52) comprises a guide frame (521), a movable frame (522), a ball supply table (523), a movable lever (524), a fixed lever (525), a screw (526), ​​a support plate (527) and a second motor (528). The bottom of the guide frame (521) is provided with a movable frame (522). The bottom end surface of the movable frame (522) is fixedly connected to the ball supply table (523). The movable lever (524) is fixedly connected to the top right side of the movable frame (522). The fixed lever (525) vertically penetrates the front and rear sides and the left side of the movable frame (522). The top of the movable lever (524) vertically penetrates the right side wall of the guide frame (521). The top of the fixed lever (525) The end of the movable frame (522) is fixedly connected to the guide frame (521), and the bottom end of the fixed gear lever (525) is fixedly connected to the support plate (527). The screw rod (526) vertically penetrates the front side wall of the movable frame (522), and the movable frame (522) is threadedly connected to the screw rod (526). The bottom end of the screw rod (526) is transmission-connected to the output shaft of the second motor (528). The second motor (528) is installed at the bottom of the support plate (527). The left side of the support plate (527) is fixedly connected to the shell (511). The left end of the guide frame (521) is connected to the top end of the right side of the shell (511), and the guide frame (521) and the shell (511) are connected. The infrared sensor 1 (53) is installed at the bottom of the ball supply table (523).

4. The liftable ball feeding platform for volleyball training according to claim 1, characterized in that: The volleyball placement frame assembly (56) comprises a placement frame (561), a goal channel (562), a protective shell (563), a rotating roller (564), a ball pushing plate (565) and a second infrared sensor (566). The bottom end of the placement frame (561) is connected to the goal channel (562). The protective shell (563) is fixed on the right side of the top of the goal channel (562). The left and right sides of the top of the goal channel (562) are respectively connected to the placement frame (561) and the protective shell (563). The protective shell (563) ) is provided with a rotating roller (564) inside, and a ball pushing plate (565) is provided on the outer wall of the rotating roller (564). A second infrared sensor (566) is installed in the middle of the bottom end of the goal channel (562). The second infrared sensor (566) is used to sense the volleyball inside the goal channel (562). The goal channel (562) is connected to the left bottom of the shell (511), and the goal channel (562) and the shell (511) are connected. The rotating roller (564) is connected to the transmission component (54) in a transmission manner.

5. The liftable ball feeding platform for volleyball training according to claim 3, characterized in that: The movable lever (524), the fixed lever (525) and the screw rod (526) are all arranged vertically.

6. The liftable ball feeding platform for volleyball training according to claim 3, characterized in that: The ball supply table (523) is tilted downward from left to right, and a baffle is provided at the right edge of the ball supply table (523).

7. The liftable ball feeding platform for volleyball training according to claim 4, characterized in that: The ball pushing plates (565) are arranged in a ring array on the outer wall of the rotating roller (564), and the spacing distance at the edges of the ball pushing plates (565) is greater than the diameter of the volleyball.

8. The liftable ball feeding platform for volleyball training according to claim 4, characterized in that: The transmission assembly (54) comprises a synchronous wheel set (541) and a gear set (542); the synchronous wheel on the left side of the synchronous wheel set (541) is transmission-connected to the gear on the right side of the gear set (542); the gear on the left side of the gear set (542) is transmission-connected to the rotating roller (564); the front side of the synchronous wheel on the right side of the synchronous wheel set (541) is transmission-connected to the output shaft of the motor 1 (55); and the rear side of the synchronous wheel on the right side of the synchronous wheel set (541) is transmission-connected to the driving wheel (513) via a transmission shaft.