CN109126089B

CN109126089B - Conveying system applied to tennis ball receiving and dispatching all-in-one machine

Info

Publication number: CN109126089B
Application number: CN201811366938.XA
Authority: CN
Inventors: 张芹芹; 李伟豪; 高静; 吴鑫辉; 汪语哲
Original assignee: Dalian Minzu University
Current assignee: Dalian Minzu University
Priority date: 2018-11-16
Filing date: 2018-11-16
Publication date: 2020-08-28
Anticipated expiration: 2038-11-16
Also published as: CN109126089A

Abstract

A transmission system applied to a tennis ball receiving and dispatching all-in-one machine belongs to the field of tennis sports equipment. Comprises a transmission mechanism; the conveying mechanism comprises a grapple, a triangular plate, a limiting shaft, a conveying belt, a positioning shaft, a guide wheel A, a conveying shaft, a shifting fork wheel and a guide wheel B; the guide wheel A and the guide wheel B are respectively located at two ends of the conveying belt, the guide wheel A is installed on a positioning shaft, the guide wheel B is installed on a conveying shaft, shifting fork wheels fixed on the conveying shaft are installed on two sides of the guide wheel B, limiting shafts are arranged on the conveying belt, symmetrical triangular plates are respectively arranged on two sides of the conveying belt, two corners of each triangular plate are fixed on the conveying belt through the two adjacent limiting shafts, and a grapple is fixed at the other corner of each triangular plate. The conveying belt can be provided with a plurality of groups of grapples, and the conveying system can be provided with a plurality of conveying belts simultaneously, so that the requirement that a large number of tennis balls need to be collected and conveyed is met.

Description

Conveying system applied to tennis ball receiving and dispatching all-in-one machine

Technical Field

The invention relates to the field of tennis sports equipment, in particular to a transmission system applied to a tennis receiving and dispatching all-in-one machine.

Background

Along with the continuous development of national economy of China in recent years, people have more and more tennis courts around the people and also have more and more people to enjoy the tennis, and the tennis as a fashionable sport has already come into the lives of people; in tennis training, when a single person serves, a lot of tennis balls are needed, a trainer serves the tennis balls in one half, the tennis balls are hit in the other half, tens of or even hundreds of times of serving are completed in one round of training, and then the used tennis balls are collected in the other half to perform a new round of training, so that a lot of time is needed in the tennis ball collecting process, the number of the tennis balls is large, the drop points of the balls are different, and the labor amount in the collecting process is large; there is a great need for a delivery system that can be mounted on a machine to meet the needs of a large collection of tennis balls.

Disclosure of Invention

In order to solve the problem that a large number of tennis balls need to be collected and transmitted in the existing tennis training, the invention provides a transmission system applied to a tennis ball receiving and transmitting all-in-one machine.

In order to achieve the purpose, the invention adopts the technical scheme that: a transmission system applied to a tennis ball receiving and dispatching all-in-one machine comprises a transmission mechanism; the conveying mechanism comprises a grapple, a triangular plate, a limiting shaft, a conveying belt, a positioning shaft, a guide wheel A, a conveying shaft, a shifting fork wheel and a guide wheel B; the guide wheel A and the guide wheel B are respectively located at two ends of the conveying belt, the guide wheel A is installed on a positioning shaft, the guide wheel B is installed on a conveying shaft, shifting fork wheels fixed on the conveying shaft are installed on two sides of the guide wheel B, limiting shafts are arranged on the conveying belt, symmetrical triangular plates are respectively arranged on two sides of the conveying belt, two corners of each triangular plate are fixed on the conveying belt through the two adjacent limiting shafts, and a grapple is fixed at the other corner of each triangular plate.

Further, a storage system B is arranged on one side of the conveying mechanism and comprises a collecting bin B and a sliding plate; the slide is located collection storehouse B upper end one side, is provided with the clearance that the grapple passes through on the slide, collects storehouse B bottom and is circular export, collects storehouse B both ends and has the support of fixing with the car shell.

Further, a storage system A is arranged on the other side of the conveying mechanism and comprises a collecting bin A and a slide way; the bottom of the collecting bin A is a V-shaped outlet, one end of a slide way is connected below the V-shaped outlet, the other end of the slide way is provided with a gap through which a grapple passes, the other end of the slide way is also provided with a baffle, and the baffle is also provided with a gap through which the grapple passes.

Furthermore, a collecting system is arranged on one side of the storage system A and comprises a rolling shaft, a semi-cylinder and a bevel gear A; the inside roller bearing that is of semicircle tube, there is the space between semicircle tube inner wall and the roller bearing outer wall, and roller bearing one side is fixed with bevel gear A.

Furthermore, two ends of the semi-cylinder are fixed with the storage system A through a support.

Further, a frequency adjusting system is arranged below the storage system B and comprises a pipeline, a motor A, a single-hole disc, a multi-hole disc and a gear A; the multi-hole disc is arranged above the single-hole disc, the pipeline is fixed below the single-hole disc, an inlet of the pipeline is communicated with a hole of the single-hole disc, the motor A is connected below the gear A, and the gear A is meshed with the outer teeth of the multi-hole disc.

Furthermore, the frequency adjusting system is connected with a ball serving system, and the ball serving system comprises a ball serving pipe, a motor B, a ball serving wheel A, a motor C and a ball serving wheel B; one end of the service pipe is communicated with an outlet of the pipeline, an opening A and an opening B are arranged on the pipe wall of the service pipe, the service wheel A is located at the opening A, the service wheel A is connected with the motor B, the service wheel B is located at the opening B, and the service wheel B is connected with the motor C.

Further, the transmission mechanism is connected with a power system, and the power system comprises a belt wheel A, a belt wheel B, a left end clutch, a right end clutch and a motor D; the belt wheel A is in belt transmission connection with the belt wheel B, the belt wheel A is fixed to the other side of the bevel gear A, the belt wheel B is fixed to one side of the right end clutch, the left end clutch is fixed to the transmission shaft, the belt wheel B and the right end clutch are slidably mounted on the transmission shaft, the handle is further mounted on the right end clutch, the bevel gear B is mounted on the output shaft of the motor D, and the bevel gear B is meshed with the bevel gear A.

Further, the transmission mechanism is also connected with the vehicle shell; the driving wheels are installed on two sides of the car shell respectively, the driving wheels are connected with the motor E, the driven wheels are installed at the bottom of the car shell, two ends of the semi-circular cylinder are fixed to the car shell through the supports, two ends of the collecting bin B are fixed to the car shell through the supports, two ends of the collecting bin A are fixed to the car shell through the supports, the positioning shaft is fixed to the car shell, the supports fixed to the car shell are arranged below the single-hole disc, the conveying shaft is installed on the car shell through the bearings, and the motor D, the motor B, the motor C and the motor A are installed on the car.

The invention has the beneficial effects that: the conveying belts can be provided with a plurality of groups of grapples, and the conveying system can be provided with a plurality of conveying belts simultaneously, so that the requirement that a large number of tennis balls need to be collected and conveyed is met.

Drawings

FIG. 1 is a schematic diagram of a conveyor system according to the present invention;

FIG. 2 is a schematic diagram A of a portion of the conveyor system of the present invention;

FIG. 3 is a schematic diagram B of a portion of the conveyor system of the present invention;

FIG. 4 is a schematic diagram of the internal structure of the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a storage system A according to the present invention;

FIG. 7 is a schematic structural diagram of a memory system B according to the present invention;

FIG. 8 is a schematic structural diagram of a frequency adjustment system of the present invention;

FIG. 9 is a schematic structural diagram B of a frequency adjustment system according to the present invention;

FIG. 10 is a schematic structural view of a ball serving system of the present invention;

FIG. 11 is a schematic structural diagram of the power system of the present invention.

In the figure, 1, a rolling shaft, 2, a semi-circular cylinder, 3, a bevel gear A, 4, a collection bin A, 5, a slideway, 6, a grapple, 7, a sliding plate, 8, a collection bin B, 9, a pipeline, 10, a motor A, 11, a single-hole disc, 12, a multi-hole disc, 13, a gear A, 14, a ball sending pipe, 15, a motor B, 16, a ball sending wheel A, 17, a motor C, 18, a ball sending wheel B, 19, a triangular plate, 20, a limiting shaft, 21, a conveying belt, 22, a positioning shaft, 23, a guide wheel A, 24, a guide wheel B, 25, a conveying shaft, 26, a handle, 27, a shifting fork wheel, 28, a left end clutch, 29, a right end clutch, 30, a motor D, 31, a belt wheel B, 32, a vehicle shell, 33, a driving wheel, 34, a motor E, 35 and a driven wheel are arranged.

Detailed Description

Example 1

The tennis ball receiving and sending all-in-one machine provided with the conveying system comprises a collecting system, a conveying system, a frequency adjusting system, a storage system A, a storage system B and a service system; the storage system A is connected with the frequency adjusting system, the frequency adjusting system is connected with the ball serving system, and the collecting system is arranged behind the storage system A.

The collecting system comprises a roller 1, a semi-cylinder 2 and a bevel gear A3; inside roller bearing 1 that is of semicircular cylinder 2, there is the space between 2 inner walls of semicircular cylinder and the 1 outer wall of roller bearing, roller bearing 1 one side is fixed with bevel gear A3, the space between 2 inner walls of semicircular cylinder and the 1 outer wall of roller bearing slightly is less than the external diameter of tennis, 2 inner walls of semicircular cylinder and the 1 outer wall of roller bearing are through the processing that increases surface friction simultaneously, can conveniently collect the ball like this, also can guarantee that the ball can fall into collection storehouse A4, 2 openings of preferred semicircular cylinder are 20 degrees with ground, the upper end is vertical, the lower extreme hypsokinesis.

And two ends of the semi-cylinder 2 are fixed with the storage system A through a bracket.

The storage system A comprises a collection bin A4 and a slide 5; the bottom of the collection bin A4 is a V-shaped outlet, one end of a slide way 5 is connected below the V-shaped outlet, the other end of the slide way 5 is provided with a gap through which a grapple 6 passes, the other end of the slide way 5 is also provided with a baffle plate, the baffle plate is also provided with a gap through which the grapple 6 passes, the number of the V-shaped outlets can be 1 or more, the front end of the slide way is slightly lower than the rear end, and the preferable angle is 15 degrees with the horizontal direction.

The storage system B comprises a collection bin B8 and a sliding plate 7; slide 7 is located collection storehouse B8 upper end one side, is provided with the clearance that grapple 6 passes through on the slide 7, collects storehouse B8 bottom and is circular export, collects storehouse B8 both ends and has the support of fixing with the car shell, collects storehouse B8 and is the thin shell structure of circle top down, and after grapple 6 walked around location axle 22, its ball of snatching would fall into and collects storehouse B8.

The frequency adjusting system comprises a pipeline 9, a motor A10, a single-hole disc 11, a multi-hole disc 12 and a gear A13; the multi-hole round disc 12 is arranged above the single-hole round disc 11, the pipeline 9 is fixed below the single-hole round disc 11, an inlet of the pipeline 9 is communicated with a hole of the single-hole round disc 11, the motor A10 is connected below the gear A13, the gear A13 is meshed with external teeth of the multi-hole round disc 12, a ball at an opening falling position below the collecting bin B8 can fall on the multi-hole round disc 12, when the hole of the multi-hole round disc 12 is communicated with the hole of the single-hole round disc 11 when the multi-hole round disc 12 rotates, the ball can fall into the pipeline 9, the frequency of the ball entering the pipeline 9 can be adjusted by adjusting the rotating speed of the motor A10, so that the ball serving frequency is controlled, a main shaft is arranged between the single-hole round disc 11 and the multi-.

The ball serving system comprises a ball serving tube 14, a motor B15, a ball serving wheel A16, a motor C17 and a ball serving wheel B18; one end of the ball serving tube 14 is communicated with an outlet of the pipeline 9, an opening A and an opening B are arranged on the tube wall of the ball serving tube 14, a ball serving wheel A16 is located at the opening A, a ball serving wheel A16 is connected with a motor B15, a ball serving wheel B18 is located at the opening B, a ball serving wheel B18 is connected with a motor C17, a section of each of the ball serving wheel A16 and the ball serving wheel B18 extends into the ball serving tube 14, the distance between the ball serving wheel A16 and the ball serving wheel B18 is slightly smaller than the diameter of a ball, the ball is launched by the friction of the ball serving wheel A16 and the ball serving wheel B18 against the ball, and the rotating speeds of the ball serving wheel A16 and the ball serving wheel B18 are respectively controlled by independent motors, so that the launching angle and the foot falling point of the ball can be adjusted.

The conveying system comprises a grapple 6, a triangular plate 19, a limiting shaft 20, a conveying belt 21, a positioning shaft 22, a guide wheel A23, a conveying shaft 25, a shifting fork wheel 27 and a guide wheel B24; the guide wheel A23 and the guide wheel B24 are respectively located at two ends of the conveying belt 21, the guide wheel A23 is installed on the positioning shaft 22, the guide wheel B24 is installed on the conveying shaft 25, the shifting fork wheels 27 fixed on the conveying shaft 25 are installed on two sides of the guide wheel B24, the conveying belt 21 is provided with the limiting shafts 20, two symmetrical triangular plates 19 are respectively arranged on two sides of the conveying belt 21, two corners of the triangular plates 19 are fixed on the conveying belt 21 through the two adjacent limiting shafts 20, the other corner of the triangular plate 19 is fixed with the grabbing hook 6, the shifting fork wheels 27 are meshed with the limiting shafts 20 to drive the conveying belt 21 to move, balls in the slide way 5 of the storage system A are taken out, and when the grabbing hook 6 bypasses the positioning shaft 22, the balls fall off from the grabbing hook 6 and fall into the collection bin B8 of the storage system B.

The conveying belt 21 can be a chain, when the chain is selected, the guide wheel A23 and the guide wheel B24 are chain wheels, guide plates are arranged on the front side and the rear side of the chain, and the chain moves on a guide rail between the two guide plates; the conveying belt 21 can also be a belt, when the belt is selected, the guide wheel A23 and the guide wheel B24 are pulleys or bearings, and a baffle is arranged on the outer side of the belt.

The transmission system applied to the tennis ball receiving and dispatching all-in-one machine also comprises a power system; the power system comprises a belt wheel A, a belt wheel B31, a left end clutch 28, a right end clutch 29 and a motor D30; the tennis ball collecting device is characterized in that the belt wheel A is in belt transmission connection with a belt wheel B31, the belt wheel A is fixed on the other side of a bevel gear A3, the belt wheel B31 is fixed on one side of a right end clutch 29, a left end clutch 28 is located on the other side of the right end clutch 29, the left end clutch 28 is fixed on a conveying shaft 25, the belt wheel B31 and the right end clutch 29 are slidably mounted on the conveying shaft 25, a handle 26 is further mounted on the right end clutch 29, a bevel gear B is mounted on an output shaft of a motor D30 and meshed with a bevel gear A3, a power system enables a collecting system to operate all the time, the conveying system can be closed due to the arrangement of the clutches, balls in a storage system B are prevented.

A delivery system for a tennis ball transceiver further comprises a vehicle shell 32; drive wheel 33 is installed respectively to car shell 32 both sides, motor E34 is connected to drive wheel 33, car shell 32 bottom installation is followed

driving wheel

35, 2 both ends of semicircle tube are fixed with car shell 32 through the support, it is fixed with car shell 32 through the support to collect storehouse B8 both ends, it is fixed with car shell 32 through the support to collect storehouse A4 both ends, location axle 22 is fixed with car shell 32, the support fixed with car shell 32 is set up to haplopore disc 11 below, conveying shaft 25 passes through the bearing and installs on car shell 32, motor D30 installs on car shell 32, motor B15, motor C17 and motor A10 all install on car shell 32, drive wheel 33 on car shell 32 is located the front end, collection system is located the rear end, it is located in the middle of drive wheel 33 and collection system to follow driving wheel 35, realize the removal of this embodiment arbitrary direction.

The embodiment realizes the integration of receiving and transmitting, the design of the clutch and the arrangement of the storage system A can ensure that the storage system B cannot overflow, meanwhile, the clutch can realize the switching of receiving and transmitting and the function of only collecting, the frequency adjusting system can control the service frequency, and the service system can control the service angle and the foot falling point.

Example 2

The installation method of the tennis ball receiving and dispatching all-in-one machine provided with the transmission system comprises the following steps: the storage system B, the frequency adjusting system and the service system are assembled respectively and then connected from top to bottom, the assembled conveying system is arranged behind the storage system B, the frequency adjusting system and the service system, the assembled storage system A is arranged behind the conveying system, and the assembled collecting system is arranged behind the storage system A.

The assembling method of the collecting system comprises the following steps: the roller 1 is mounted inside the half cylinder 2 such that the roller 1 is coaxial with the half cylinder 2.

The assembling method of the storage system A comprises the following steps: the slideway 5 is arranged at the bottom of the collection bin A4, one end of the slideway 5 corresponds to the outlet at the bottom of the collection bin A4, and the height of the other end of the slideway 5 is lower than that of one end of the slideway 5.

The assembling method of the storage system B comprises the following steps: the slide plate 7 is arranged at one side of the upper end of the collecting bin B8, and one side of the slide plate 7, which is provided with the grapple 6 through the gap, is positioned at the outer end.

The assembly method of the frequency regulating system comprises the following steps: the single-hole disc 11 and the multi-hole disc 12 are installed on a shaft, wherein the single-hole disc 11 is fixed with the shaft, the multi-hole disc 12 is installed above the single-hole disc 11, the pipeline 9 is installed below the single-hole disc 11 and communicated with holes of the single-hole disc 11, and the multi-hole disc 12 is installed in a meshed mode with a gear A13 provided with a motor A10.

The assembly method of the service system comprises the following steps: the ball serving wheel A16 is arranged at an opening A arranged on the pipe wall of the ball serving pipe 14, the ball serving wheel A16 is connected with the motor B15, the ball serving wheel B18 is arranged at an opening B arranged on the pipe wall of the ball serving pipe 14, and the ball serving wheel B18 is connected with the motor C17.

The assembling method of the conveying system comprises the following steps: the guide wheel A23 is arranged on the positioning shaft 22, the guide wheel B24 is arranged on the conveying shaft 25, the shifting fork wheel 27 is arranged on the conveying shaft 25 and positioned at two sides of the guide wheel B24, the grapple 6 is arranged on the conveying belt 21, the conveying belt 21 is sleeved on the guide wheel B24 and the guide wheel A23, and the positioning shaft 22 is arranged above the conveying shaft 25.

The assembled power system also needs to be installed; the assembling method of the power system comprises the following steps: the pulley a is attached to the roller 1 side, the left end clutch 28 is fixed to the conveyance shaft 25, and the pulley B31 is fixed to the right end clutch 29 and slidably attached to the conveyance shaft 25.

The vehicle shell 32 also needs to be installed; the driving wheel 33 and the driven wheel 35 are installed on the vehicle shell 32, the single-hole round disc 11 is fixed with the vehicle shell 32 after the bulb tube 14 is connected with the pipeline 9, then the positioning shaft 22 is fixed inside the vehicle shell 32, the conveying shaft 25 is installed in the vehicle shell 32 through a bearing, the supports on two sides of the semi-cylinder 2 are fixed with the collection bin A4, the supports on two sides of the semi-cylinder 2 are connected with the vehicle shell 32, and the camera is installed at the front end of the vehicle shell 32.

Placing the storage system a behind the conveyor system requires that the position of the chute 5 corresponds to the position of the grapple 6.

The mounting of the conveyor system behind the storage system B, the frequency adjustment system and the service system requires the position of the grapple 6 to correspond to the position of the slide 7.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. A transmission system applied to a tennis ball receiving and dispatching all-in-one machine is characterized by comprising a transmission mechanism; the conveying mechanism comprises a grapple (6), a triangular plate (19), a limiting shaft (20), a conveying belt (21), a positioning shaft (22), a guide wheel A (23), a conveying shaft (25), a shifting fork wheel (27) and a guide wheel B (24); the guide wheel A (23) and the guide wheel B (24) are respectively positioned at two ends in the conveying belt (21), the guide wheel A (23) is installed on the positioning shaft (22), the guide wheel B (24) is installed on the conveying shaft (25), fork wheels (27) fixed on the conveying shaft (25) are installed at two sides of the guide wheel B (24), a limiting shaft (20) is arranged on the conveying belt (21), symmetrical triangular plates (19) are respectively arranged at two sides of the conveying belt (21), two corners of the triangular plates (19) are fixed on the conveying belt (21) by two adjacent limiting shafts (20), a grab hook (6) is fixed at the other corner of the triangular plate (19), the conveying mechanism is connected with a power system, the power system comprises a belt wheel B (31), a left end clutch (28) and a right end clutch (29), the belt wheel B (31) is fixed on one side of the right end clutch (29), and the left end clutch (28) is fixed on the conveying shaft (25), a pulley B (31) and a right-end clutch (29) are slidably mounted on the transmission shaft (25).

2. A conveying system applied to tennis ball transceiver as set forth in claim 1, wherein a storage system B is arranged at one side of the conveying mechanism, and the storage system B comprises a collecting bin B (8) and a sliding plate (7); slide (7) are located and collect storehouse B (8) upper end one side, are provided with the clearance that grapple (6) passed through on slide (7), collect storehouse B (8) bottom and be circular export, collect storehouse B (8) both ends have with the fixed support of car shell.

3. The conveying system applied to the tennis ball receiving and dispatching all-in-one machine is characterized in that a storage system A is arranged on the other side of the conveying mechanism, and comprises a collecting bin A (4) and a slide way (5); the bottom of the collection bin A (4) is a V-shaped outlet, one end of a slide way (5) is connected below the V-shaped outlet, the other end of the slide way (5) is provided with a gap through which a grapple (6) passes, the other end of the slide way (5) is also provided with a baffle, and the baffle is also provided with a gap through which the grapple (6) passes.

4. A conveying system for tennis ball receiving and dispatching integrated machine as claimed in claim 3, wherein a collecting system is arranged at one side of said storage system a, and comprises a roller (1), a semi-cylinder (2) and a bevel gear a (3); the inside of the semi-cylinder (2) is provided with a roller (1), a gap is arranged between the inner wall of the semi-cylinder (2) and the outer wall of the roller (1), and one side of the roller (1) is fixed with a bevel gear A (3).

5. A conveying system for tennis ball receiving and dispatching machine as claimed in claim 4, wherein said semi-cylinder (2) is fixed with the storage system A by the bracket at both ends.

6. A conveyor system for tennis ball transceiver as claimed in claim 2, wherein a frequency regulating system is arranged below the storage system B, and comprises a pipeline (9), a motor a (10), a single-hole disc (11), a multi-hole disc (12) and a gear a (13); porous disc (12) is arranged above the single-hole disc (11), a pipeline (9) is fixed below the single-hole disc (11), an inlet of the pipeline (9) is communicated with a hole of the single-hole disc (11), a motor A (10) is connected below a gear A (13), and the gear A (13) is meshed with external teeth of the porous disc (12).

7. A conveyor system for tennis ball transceiver as claimed in claim 6, wherein said frequency adjustment system is connected to a service system comprising a service pipe (14), a motor B (15), a service wheel A (16), a motor C (17) and a service wheel B (18); one end of the ball serving tube (14) is communicated with an outlet of the pipeline (9), an opening A and an opening B are arranged on the tube wall of the ball serving tube (14), the ball serving wheel A (16) is located at the opening A, the ball serving wheel A (16) is connected with the motor B (15), the ball serving wheel B (18) is located at the opening B, and the ball serving wheel B (18) is connected with the motor C (17).

8. A conveyor system for a tennis ball transceiver as defined in claim 1 wherein said power system further comprises a pulley a and a motor D (30); the belt wheel A is in belt transmission connection with a belt wheel B (31), the belt wheel A is fixed on the other side of the bevel gear A (3), a handle (26) is further installed on a right-end clutch (29), a bevel gear B is installed on an output shaft of the motor D (30), and the bevel gear B is meshed with the bevel gear A (3).

9. A transfer system for a tennis ball transceiving machine according to claim 1, wherein the transfer mechanism is further connected to a vehicle shell (32); drive wheel (33) are installed respectively to car shell (32) both sides, motor E (34) is connected in drive wheel (33), car shell (32) bottom installation is from driving wheel (35), it is fixed with car shell (32) that the support is passed through at semicircle tube (2) both ends, it is fixed with car shell (32) to collect storehouse B (8) both ends through support, it is fixed with car shell (32) to collect storehouse A (4) both ends, location axle (22) are fixed with car shell (32), haplopore disc (11) below sets up the support fixed with car shell (32), conveying axle (25) are installed on car shell (32) through the bearing, motor D (30), motor B (15), motor C (17) and motor A (10) are all installed on car shell (32).