CN215582585U

CN215582585U - Multifunctional seeder

Info

Publication number: CN215582585U
Application number: CN202122125410.7U
Authority: CN
Inventors: 王玉军; 王之尧; 樊学民; 王青秀; 周献玲; 杨永振
Original assignee: Henan Kehaiting Machinery Co ltd
Current assignee: Henan Kehaiting Machinery Co ltd
Priority date: 2021-09-04
Filing date: 2021-09-04
Publication date: 2022-01-21
Anticipated expiration: 2031-09-04

Abstract

The utility model discloses a multifunctional seeder, which comprises a rack, an adjusting unit and a seed throwing unit, wherein the rack is provided with a seed inlet and a seed outlet; a frame: the front side of the upper surface of the connecting seat is provided with a connecting seat; an adjusting unit: the sowing legs are uniformly distributed on the front side of the lower surface of the adjusting unit, and the covering legs are uniformly distributed on the rear side of the lower surface of the adjusting unit; a seed throwing unit: set up in the upper surface middle part of frame, the lower extreme of seeding leg all with the lower extreme fixed connection of the unit of planting, the regulating unit includes slider one, slider two and fixed strip, the quantity of fixed strip is three, the upper surface front side of fixed strip all is equipped with slider one, this multifunctional seeder, the seeding leg of cooperation work together, the leg of fertilizing is fixed on same fixed strip with the cover leg, can adjust in step with the lead screw, and then change the row spacing of seeding, it is simple and convenient to adjust, the seeding time has been practiced thrift, the seeding efficiency has been improved.

Description

Multifunctional seeder

Technical Field

The utility model relates to the technical field of corn seeding and fertilizing, in particular to a multifunctional seeder.

Background

Chinese has a phrase of idiom, called "people take food as the day", the grain is a necessary product on which we rely for survival, the grain needs to be sown in the planting process, and then needs to use a multifunctional sowing machine, the multifunctional sowing machine can also fertilize while sowing, the labor burden of the planting personnel is greatly reduced, the traditional multifunctional sowing machine is generally provided with a sowing leg, a fertilizing leg and a covering leg, the sowing leg and the fertilizing leg open a groove on the soil, then the fertilizer and the seeds fall conveniently, then the soil turned up by the fertilizing leg covers the seeds, the covering leg covers the soil higher than the ground on the fertilizer, the sowing and the fertilizing are completed, when the planting requirements of the seeds are different, the planting row spacing needs to be adjusted, the sowing leg, the fertilizing leg and the covering leg of the traditional multifunctional sowing machine are respectively fixed on the sowing machine frame by bolts, and then one is needed to be adjusted, the regulation is troublesome, influences seeding efficiency, for this reason, we provide a multi-functional seeder.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a multifunctional seeder, wherein a fertilizing leg, a covering leg and a seeding leg can be synchronously adjusted, the adjustment is simple and convenient, and the problems in the background art can be effectively solved.

In order to achieve the purpose, the utility model provides the following technical scheme: a multifunctional seeder comprises a frame, an adjusting unit and a seed throwing unit;

a frame: the front side of the upper surface of the connecting seat is provided with a connecting seat;

an adjusting unit: the sowing legs are uniformly distributed on the front side of the lower surface of the adjusting unit, and the covering legs are uniformly distributed on the rear side of the lower surface of the adjusting unit;

a seed throwing unit: set up in the upper surface middle part of frame, the lower extreme of the seeding leg all with the lower extreme fixed connection who throws kind of unit, can adjust the row spacing of seeding through the lead screw, and in the adjustment, the leg of fertilizeing, cover leg and seeding leg ability synchronous motion, and then need not divide to fertilize the leg many times, cover leg and seeding leg carry out the adjusting position, the needs of different varieties maize seeding have been satisfied, and save adjustment time, help promoting seeding efficiency, and can also guarantee the fertilization leg that corresponds, relative position can not change between cover leg and the seeding leg, guarantee the earthing quality, and then guaranteed the seeding quality.

Further, the regulating unit includes slider one, slider two and fixed strip, the quantity of fixed strip is three, and the upper surface front side of fixed strip all is equipped with slider one, and the upper surface rear side of fixed strip all is equipped with slider two, slider one all with the leading flank slide rail sliding connection of frame, slider two respectively with the lower surface middle part slide rail two sliding connection of frame, the lower surface front side of fixed strip all is equipped with the seeding leg, the lower surface rear side of fixed strip all is equipped with the cover leg, can conveniently broadcast the synchronization regulation of leg and cover leg.

Further, the regulating unit still includes two-way lead screw and one-way lead screw, two-way lead screw passes through one rotation of lead screw seat to be connected in the lower surface middle part of frame, the both ends of two-way lead screw respectively with the fixed strip threaded connection of the left and right sides, the extrados middle part of two-way lead screw runs through middle fixed strip, one-way lead screw passes through two rotations of lead screw seat to be connected in the lower surface front side of frame, the both ends of one-way lead screw run through the fixed strip of the left and right sides and with middle fixed strip threaded connection, make things convenient for the regulation of fixed strip interval.

Further, the unit of planting of throwing seeds includes supporting seat, seed fill, seeding axle, unloading rim plate and play seed, the supporting seat sets up in the upper surface middle part of frame, the seed fill all with the upper end fixed connection of supporting seat, the inside of supporting seat is rotated and is connected with the seeding axle, the extrados face of seeding axle is equipped with evenly distributed's unloading rim plate, the unloading rim plate is located the inside of seed fill respectively, the lower extreme seed outlet department that the seed was fought all is equipped with the play seed pipe with seeding leg fixed connection, can be convenient sow.

Further, the lower surface middle part of fixed strip all is equipped with the leg of fertilizeing through the connecting strip symmetry, and the upper surface rear side of frame is equipped with the fertilizer bucket, and the inside of fertilizer bucket rotates and is connected with down fertile roller, and the outer cambered surface discharge gate department of lower extreme of fertilizer bucket all is equipped with the fertilizer pipe with fertilize leg fixed connection, can fertilize simultaneously when the seeding.

The right-hand member of sowing axle extends the right flank of supporting seat and is equipped with first sprocket in end department, and the right-hand member pivot of lower fertile roller extends the right flank of fertilizer hopper and is equipped with second sprocket and third sprocket in end department, and the second sprocket is located the left side of third sprocket, and first sprocket and second sprocket pass through chain drive connection, make things convenient for the synchro control of fertilization and seeding.

The rear end of the rack is rotatably connected with a wheel shaft through a bearing, wheels are symmetrically arranged on the outer arc surface of the wheel shaft, the right end of the wheel shaft extends out of the right side surface of the rack, a fourth chain wheel is arranged at the end, and the fourth chain wheel is in transmission connection with the third chain wheel through a second chain wheel, so that power is provided for fertilizing and seeding.

Compared with the prior art, the utility model has the beneficial effects that: this multifunctional seeder has following benefit:

when the row spacing of the corn needs to be changed due to different varieties of the corn to be sown, the seeder leaves the ground through the acting force of the traction machine, when the row spacing of the corn to be sown is consistent, the bidirectional screw rod can be rotated, the thread directions at the two ends of the bidirectional screw rod are opposite, the bidirectional screw rod drives the fixing strips at the left side and the right side to move downwards in opposite directions under the supporting and guiding directions of the first sliding block and the second sliding block, the distances between the fixing strips at the two sides and the fixing strip at the middle are further changed, meanwhile, the fixing strips at the two sides can drive the sowing legs, the fertilizing legs and the covering legs at the lower surfaces of the fixing strips to synchronously move, the row spacing of the corn to be sown is changed, when the corn needs to be sown in rows with different sizes, the unidirectional screw rod can be rotated, the unidirectional screw rod drives the fixing strip at the middle to transversely move, the distances between the fixing strips at the middle and the fixing strips at the two sides are respectively changed, and are reduced while being increased, the fixed strip can drive the seeding leg of its lower surface like the same reason, fertilize leg and cover leg synchronous motion, and then the row spacing that the seeding came out will be different, can satisfy different seeding needs, can adjust the row spacing of seeding through the lead screw, and in the adjustment, fertilize the leg, cover leg and seeding leg can synchronous motion, and need not divide many times to fertilize the leg, cover leg and seeding leg carry out the adjusting position, the needs of different varieties maize seeding have been satisfied, and save adjust time, help promoting seeding efficiency, and can also guarantee the fertilization leg that corresponds, relative position can not change between cover leg and the seeding leg, guarantee earthing quality, and then guaranteed seeding quality.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

FIG. 2 is an enlarged schematic view of the structure at the position A of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is an enlarged view of the structure of the present invention at B;

fig. 5 is a schematic structural view of the rear side of the fixing strip of the present invention.

In the figure: the fertilizer sowing machine comprises a machine frame 1, a regulating unit 2, a first slide block 21, a second slide block 22, a fixed strip 23, a bidirectional screw rod 24, a unidirectional screw rod 25, a seed sowing leg 3, a fertilizer applying leg 4, a covering leg 5, a seed throwing unit 6, a support seat 61, a seed hopper 62, a seed sowing shaft 63, a discharging wheel disc 64, a seed discharging pipe 65, a connecting seat 7, a first chain 8, a wheel shaft 9, a wheel 10, a second chain 11, a fertilizer hopper 12, a fertilizer applying roller 13 and a fertilizer applying pipe 14.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present embodiment provides a technical solution: a multifunctional seeder comprises a frame 1, an adjusting unit 2 and a seed feeding unit 6;

a rack 1: the front side of the upper surface of the frame is provided with a connecting seat 7, and the frame 1 provides mounting positions for other parts, so that the connecting seat 7 is connected with a traction machine;

the adjusting unit 2: the seeding legs 3 are uniformly distributed on the front side of the lower surface of the adjusting unit 2, the covering legs 5 are uniformly distributed on the rear side of the lower surface of the adjusting unit 2, the adjusting unit 2 comprises a first sliding block 21, a second sliding block 22 and a fixing strip 23, the number of the fixing strips 23 is three, the first sliding block 21 is arranged on the front side of the upper surface of the fixing strip 23, the second sliding block 22 is arranged on the rear side of the upper surface of the fixing strip 23, the first sliding block 21 is slidably connected with a first sliding rail on the front side of the frame 1, the second sliding block 22 is slidably connected with a second sliding rail in the middle of the lower surface of the frame 1, the seeding legs 3 are arranged on the front side of the lower surface of the fixing strip 23, the covering legs 5 are arranged on the rear side of the lower surface of the fixing strip 23, the adjusting unit 2 further comprises a bidirectional screw rod 24 and a unidirectional screw rod 25, the bidirectional screw rod 24 is rotatably connected to the middle of the lower surface of the frame 1 through a screw rod seat, and two ends of the bidirectional screw rod 24 are respectively in threaded connection with the fixing strips 23 on the left side and the right side, the middle part of the outer cambered surface of the bidirectional screw rod 24 penetrates through the middle fixing strip 23, the unidirectional screw rod 25 is rotatably connected to the front side of the lower surface of the frame 1 through the screw rod seat II, two ends of the unidirectional screw rod 25 penetrate through the fixing strips 23 on the left and right sides and are in threaded connection with the middle fixing strip 23, when the row spacing of corn is required to be changed due to different varieties of the corn to be sown, the seeder leaves the ground through the acting force of a traction machine, when the row spacing of the corn to be sown is consistent, the bidirectional screw rod 24 can be rotated, the thread directions of the two ends of the bidirectional screw rod 24 are opposite, the bidirectional screw rod 24 drives the fixing strips 23 on the left and right sides to move downwards in opposite directions under the supporting and guiding of the first sliding block 21 and the second sliding block 22, further, the distances between the fixing strips 23 on the two sides and the fixing strip 23 in the middle are changed, and meanwhile, the fixing strips 23 on the two sides can drive the sowing legs 3 and the covering legs 5 on the lower surface to synchronously move, so that the row spacing of the sowing is changed, when the corns need to be sowed in large and small rows, the one-way screw rod 25 can be rotated, the one-way screw rod 25 drives the middle fixing strip 23 to transversely move, further, the distance between the middle fixing strip 23 and the fixing strips 23 at the two sides is changed, the middle fixing strip 23 is increased and reduced, the fixing strips 23 can drive the sowing legs 3 and the covering legs 5 on the lower surfaces of the middle fixing strip to synchronously move, the row distances of the sowed corns are different, and different sowing requirements can be met;

seed throwing unit 6: the seed sowing device is arranged in the middle of the upper surface of a rack 1, the lower ends of sowing legs 3 are fixedly connected with the lower ends of the seed sowing units 6, each seed sowing unit 6 comprises a supporting seat 61, a seed hopper 62, a sowing shaft 63, a discharging wheel disc 64 and a seed discharging pipe 65, the supporting seat 61 is arranged in the middle of the upper surface of the rack 1, the seed hoppers 62 are fixedly connected with the upper ends of the supporting seat 61, the inside of the supporting seat 61 is rotatably connected with the seed sowing shaft 63, the supporting seat 61 provides installation positions for the seed hoppers 62 and the sowing shaft 63, the outer arc surface of the seed sowing shaft 63 is provided with the uniformly distributed discharging wheel discs 64, the discharging wheel discs 64 are respectively positioned inside the seed hoppers 62, seed discharging pipes 65 fixedly connected with the sowing legs 3 are arranged at seed outlets at the lower ends of the seed hoppers 62, the discharging wheel discs 64 are driven by the shaft 63, seed grooves are formed in the outer arc surfaces of the discharging wheel discs 64, seeds fall into the seed grooves to rotate along with the discharging wheel discs 64, and are discharged from the lower ends of the seed hoppers 62 to the seed discharging pipes 65, furthermore, the seeds enter the grooves on the ground from the seeding pipes of the seeding legs 3, the middle parts of the lower surfaces of the fixed strips 23 are symmetrically provided with fertilizer applying legs 4 through connecting strips, the rear side of the upper surface of the frame 1 is provided with a fertilizer hopper 12, the interior of the fertilizer hopper 12 is rotatably connected with a fertilizer roller 13, the discharge outlet of the outer arc surface at the lower end of the fertilizer hopper 12 is provided with a fertilizer conveying pipe 14 fixedly connected with the fertilizer applying legs 4, the right end of a seeding shaft 63 extends out of the right side surface of the supporting seat 61 and is provided with a first chain wheel at the end, the right end rotating shaft of the lower fertilizer roller 13 extends out of the right side surface of the fertilizer hopper 12 and is provided with a second chain wheel and a third chain wheel at the end, the second chain wheel is positioned at the left side of the third chain wheel, the first chain wheel and the second chain wheel are in transmission connection through a chain I8, the corn seeds are respectively added into the seed hopper 62, then fertilizer is added into the fertilizer hopper 12, then under the action of a traction machine, the seeding legs 3 and the fertilizer applying legs 4 are pierced into the soil, the tractor drives the rack 1 to move forwards through the connecting seat 7, the rack 1 drives the slide block I21 and the slide block II 22 to move forwards through the slide rail I and the slide rail II, then the slide block I21 and the slide block II 22 drive the fixing strip 23 to move forwards, further the fixing strip 23 drives the sowing leg 3, the fertilizing leg 4 and the covering leg 5 to move forwards, further the sowing leg 3 and the fertilizing leg 4 moving forwards turn the soil open to form a groove, the rear end of the rack 1 is rotatably connected with a wheel axle 9 through a bearing, wheels 10 are symmetrically arranged on the outer arc surface of the wheel axle 9, the right end of the wheel axle 9 extends out of the right side surface of the rack 1, a fourth chain wheel is arranged at the end, the fourth chain wheel and the third chain are in transmission connection through a chain II 11, the rack 1 drives the wheels 10 to move forwards through the wheel axle 9, the wheels 10 roll along the ground, further the wheels 10 drive the wheel axle 9 to rotate, the wheel axle 9 drives the fourth chain to rotate, the fourth sprocket passes through two 11 drive third sprockets of chain rotatory, it is rotatory that the third sprocket drives down fertile roller 13, the extrados of fertile roller 13 down is seted up flutedly, and then it is rotatory that fertile roller 13 drives the inside fertilizer of recess down, and then move to the below and discharge fertilizer conveying pipe 14 through the discharge gate, then fertilizer is in the fertilizer pipe 14 that flows to the fertilization pipe of fertilization leg 4 along fertilizer conveying pipe, and then flow in the slot that fertilization leg 4 was opened, it is rotatory that fertile roller 13 drives the second sprocket down simultaneously, the second sprocket drives first sprocket through a chain 8 and rotates, first sprocket drives the seeding shaft 63 rotation.

The working principle of the multifunctional seeder provided by the utility model is as follows: connecting a connecting seat 7 and a traction machine, respectively adding corn seeds into a seed hopper 62, then adding fertilizer into a fertilizer hopper 12, then under the action of the traction machine, enabling a seeding leg 3 and a fertilizing leg 4 to penetrate into the soil, the traction machine drives a rack 1 to move forwards through the connecting seat 7, the rack 1 drives a sliding block I21 and a sliding block II 22 to move forwards through the sliding block I and the sliding block II, then the sliding block I21 and the sliding block II 22 drive a fixing strip 23 to move forwards, further the fixing strip 23 drives the seeding leg 3, the fertilizing leg 4 and a covering leg 5 to move forwards, further the seeding leg 3 and the fertilizing leg 4 moving forwards open the soil to form a groove, meanwhile, the rack 1 drives a wheel 10 to move forwards through a wheel shaft 9, the wheel 10 rolls along the ground, further the wheel shaft 9 is driven by the wheel shaft 9 to rotate, the wheel shaft 9 drives a fourth chain wheel to rotate, and the fourth chain wheel drives a third chain wheel to rotate through a chain II 11, the third chain wheel drives the lower fertilizer roller 13 to rotate, the outer arc surface of the lower fertilizer roller 13 is provided with a groove, the lower fertilizer roller 13 drives the fertilizer in the groove to rotate, the fertilizer moves to the lower part and is discharged to the fertilizer conveying pipe 14 through the discharge hole, then the fertilizer flows to the fertilizer conveying pipe of the fertilizer applying leg 4 along the fertilizer conveying pipe 14 and then flows into the groove formed by the fertilizer applying leg 4, meanwhile, the lower fertilizer roller 13 drives the second chain wheel to rotate, the second chain wheel drives the first chain wheel to rotate through a chain I8, the first chain wheel drives the sowing shaft 63 to rotate, the sowing shaft 63 drives the discharging wheel disc 64, the outer arc surface of the discharging wheel disc 64 is provided with a seed groove, the seeds fall into the seed groove and rotate along with the discharging wheel disc 64, the seeds are discharged to the seed discharging pipe 65 from the lower end of the seed hopper 62, then the seeds enter the groove on the ground from the sowing pipe of the seed legs 3, and the fertilizer applying legs 4 equally divide the left side and the right side of the seed sowing legs 3, furthermore, in the process of advancing the seeder, the soil turned up by the fertilizing legs 4 covers the groove with seeds, meanwhile, the covering legs 5 cover the soil higher than the ground into the groove with fertilizer, so that seeding and fertilizing are synchronously finished, when the types of the sowed corns are different and the row spacing of the corns needs to be changed, the seeder leaves the ground through the acting force of a traction machine, when the row spacing of the sowed corns is consistent, the bidirectional screw rod 24 can be rotated, the thread directions at the two ends of the bidirectional screw rod 24 are opposite, the bidirectional screw rod 24 drives the fixing strips 23 at the left side and the right side to move downwards in opposite directions under the supporting and guiding directions of the first slide block 21 and the second slide block 22, further, the distances between the fixing strips 23 at the two sides and the fixing strip 23 in the middle are changed, meanwhile, the fixing strips 23 at the two sides can drive the sowing legs 3, the fertilizing legs 4 and the covering legs 5 at the lower surfaces of the bidirectional screw rod to synchronously move, and further, the row spacing of the sowed corns is changed, when the maize needs to divide big or small row seeding, can rotate one-way lead screw 25, one-way lead screw 25 drives the fixed strip 23 in the middle of taking place horizontal removal, and then the fixed strip 23 in the middle of the difference changes with the distance between the fixed strip 23 of both sides, and reduce on one side the increase, fixed strip 23 can drive the seeding leg 3 of its lower surface on the same reason, fertilize leg 4 and cover 5 synchronous motion of leg, and then the row spacing of sowing out will be different, can satisfy different seeding needs.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a multifunctional seeder which characterized in that: comprises a frame (1), an adjusting unit (2) and a seed throwing unit (6);

frame (1): the front side of the upper surface of the connecting base is provided with a connecting base (7);

adjusting unit (2): the seeding device is arranged on the lower surface of the rack (1), seeding legs (3) which are uniformly distributed are arranged on the front side of the lower surface of the adjusting unit (2), and covering legs (5) which are uniformly distributed are arranged on the rear side of the lower surface of the adjusting unit (2);

seed feeding unit (6): is arranged in the middle of the upper surface of the frame (1), and the lower ends of the seeding legs (3) are fixedly connected with the lower ends of the seeding units (6).

2. The multifunctional seeding machine according to claim 1, characterized in that: adjusting element (2) include slider one (21), slider two (22) and fixed strip (23), the quantity of fixed strip (23) is three, and the upper surface front side of fixed strip (23) all is equipped with slider one (21), and the upper surface rear side of fixed strip (23) all is equipped with slider two (22), slider one (21) all with a leading flank slide rail sliding connection of frame (1), slider two (22) respectively with the lower surface middle part slide rail two sliding connection of frame (1), the lower surface front side of fixed strip (23) all is equipped with seeding leg (3), the lower surface rear side of fixed strip (23) all is equipped with covers leg (5).

3. The multifunctional seeding machine according to claim 2, characterized in that: adjusting element (2) still include two-way lead screw (24) and one-way lead screw (25), two-way lead screw (24) are rotated through screw base one and are connected in the lower surface middle part of frame (1), the both ends of two-way lead screw (24) respectively with fixed strip (23) threaded connection of the left and right sides, the outer cambered surface middle part of two-way lead screw (24) runs through middle fixed strip (23), one-way lead screw (25) rotate through screw base two and connect in the lower surface front side of frame (1), the both ends of one-way lead screw (25) run through the fixed strip (23) of the left and right sides and with middle fixed strip (23) threaded connection.

4. The multifunctional seeding machine according to claim 2, characterized in that: throw kind of unit (6) including supporting seat (61), seed fill (62), seeding axle (63), unloading rim plate (64) and play seed (65), supporting seat (61) set up in the upper surface middle part of frame (1), seed fill (62) all with the upper end fixed connection of supporting seat (61), the inside rotation of supporting seat (61) is connected with seeding axle (63), the extrados face of seeding axle (63) is equipped with evenly distributed's unloading rim plate (64), unloading rim plate (64) are located the inside that seed was fought (62) respectively, the lower extreme delivery port department that the seed was fought (62) all is equipped with and broadcasts kind leg (3) fixed connection's play seed pipe (65).

5. The multifunctional seed drill as claimed in claim 4, characterized in that: the lower surface middle part of fixed strip (23) all is equipped with fertilization leg (4) through the connecting strip symmetry, and the upper surface rear side of frame (1) is equipped with fertilizer hopper (12), and the inside of fertilizer hopper (12) is rotated and is connected with down fertile roller (13), and the outer cambered surface discharge gate department of lower extreme of fertilizer hopper (12) all is equipped with defeated fertile pipe (14) with fertilization leg (4) fixed connection.

6. The multifunctional seed drill as claimed in claim 5, characterized in that: the right end of the sowing shaft (63) extends out of the right side face of the supporting seat (61) and is provided with a first chain wheel at the end, the right end rotating shaft of the lower fertilizer roller (13) extends out of the right side face of the fertilizer hopper (12) and is provided with a second chain wheel and a third chain wheel at the end, the second chain wheel is located on the left side of the third chain wheel, and the first chain wheel and the second chain wheel are in transmission connection through a first chain wheel (8).

7. The multifunctional seed drill as claimed in claim 6, characterized in that: the rear end of the rack (1) is rotatably connected with a wheel shaft (9) through a bearing, wheels (10) are symmetrically arranged on the outer arc surface of the wheel shaft (9), the right end of the wheel shaft (9) extends out of the right side surface of the rack (1), a fourth chain wheel is arranged at the end of the right end of the wheel shaft, and the fourth chain wheel and the third chain wheel are in transmission connection through a second chain (11).