CN218578676U - Variable-pitch shuttle vehicle - Google Patents

Abstract

The utility model relates to a storage commodity circulation field discloses a displacement shuttle, including automobile body, fixed fork, removal fork, middle layer board and displacement mechanism, displacement mechanism includes two parallel arrangement's drive shaft, and two the drive shaft all set up in first automobile body or in the cavity of second automobile body, two the drive shaft passes through two hold-in ranges of gear drive differential drive, two the hold-in range is used for the drive respectively remove the fork with middle layer board. The utility model provides a through setting up two times journey (two drive gear promptly) in two drive shafts departments, and two drive shafts arrange in the cavity of the automobile body of displacement shuttle to can ensure that the middle layer board is located the intermediate position between removal fork and the fixed fork throughout when removing the fork and remove, can not influence whole car structure again, ensure that the whole car size of displacement shuttle does not change.

Description

Variable-pitch shuttle vehicle

Technical Field

The utility model relates to a storage logistics technical field especially relates to a displacement shuttle.

Background

Modern logistics is developed rapidly, shuttle goods to people's system storage density is high, and the goods is selected efficiently, and artifical intensity is low, consequently uses extensively in modern storage. Pick and place of containers or goods is generally achieved by a shuttle which travels on the rack rails to pick and place goods.

At present, a variable-pitch structure with a middle supporting plate of a variable-pitch shuttle car generally comprises two groups of synchronous wheels or chain wheels with different sizes, and the like which are used for respectively driving the middle supporting plate to move a pallet fork, wherein the indexing circumferential lengths of the two groups of wheels are different by one time, so that the linear speeds of the two groups of wheels are different by one time, finally, the speed and the moving distance of the middle supporting plate are half of the speed and the moving distance of the moving pallet fork, the middle supporting plate is always positioned at the middle position of a fixed pallet fork and the moving pallet fork, and the middle supporting plate is positioned at the middle part of a container at any time.

The method has the disadvantages that when the indexing circumference of the synchronizing wheel with the same tooth shape or the chain wheel with the same pitch is different by one time, the excircle of the large wheel is overlarge, the occupied space is large, the overall height of the shuttle vehicle is directly increased in order to avoid interference with other functional modules of the shuttle vehicle, and then the height of a three-dimensional goods shelf layer is increased, so that the storage density of the three-dimensional goods shelf is reduced finally.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a displacement shuttle can ensure that middle layer board is located the intermediate position between removal fork and the fixed fork all the time when removing the fork and remove, can not influence whole car structure again.

To achieve the purpose, the utility model adopts the following technical proposal:

a pitch-variable shuttle, comprising:

the vehicle comprises a vehicle body and a control device, wherein the vehicle body comprises a first vehicle body and a second vehicle body which are arranged at intervals and a guide shaft connected between the first vehicle body and the second vehicle body;

the fixed fork is sleeved on the guide shaft and is fixedly connected with the first vehicle body;

the movable fork is sleeved on the guide shaft in a sliding manner and can move towards the direction close to or far away from the fixed fork;

the middle supporting plate is sleeved on the guide shaft in a sliding manner and is positioned between the movable fork and the fixed fork;

the pitch-changing mechanism comprises two driving shafts which are arranged in parallel, the two driving shafts are arranged in a cavity of the first vehicle body or a cavity of the second vehicle body, the two driving shafts drive two groups of synchronous belts through gear transmission differential, and the two groups of synchronous belts are used for driving the movable fork and the middle supporting plate respectively.

As a preferable technical solution of the variable pitch shuttle car, the variable pitch mechanism includes:

a first driving shaft and a second driving shaft which are arranged in parallel and are both arranged in a cavity of the first vehicle body, wherein one of the first driving shaft and the second driving shaft is driven by a driving source;

the first transmission gear and the second transmission gear are fixedly sleeved on the first driving shaft and the second driving shaft in a one-to-one correspondence mode respectively, the first transmission gear is meshed with the second transmission gear, and the first transmission gear and the second transmission gear have a set transmission ratio;

the first synchronizing wheel and the second synchronizing wheel are fixedly sleeved on the first driving shaft and the second driving shaft in a one-to-one correspondence manner respectively;

the first idle wheel and the second idle wheel are arranged in a cavity of the second vehicle body, and the first idle wheel and the second idle wheel correspond to the first synchronous wheel and the second synchronous wheel one by one;

the first synchronous belt is arranged on the first synchronous wheel, the first idler wheel is arranged on the second synchronous wheel, one of the first synchronous belt and the second synchronous belt is connected with the movable pallet fork, and the other one of the first synchronous belt and the second synchronous belt is connected with the middle pallet fork.

As a preferable technical scheme of the variable-pitch shuttle car, a first connecting block is arranged on the first synchronous belt, a second connecting block is arranged on the second synchronous belt, and the first connecting block and the second connecting block are used for being connected with the movable fork and the middle supporting plate respectively.

As a preferable technical scheme of the variable-pitch shuttle car, the number of the first synchronizing wheels, the number of the first idle wheels and the number of the first synchronizing belts are two, and the first synchronizing wheels, the first idle wheels and the first synchronizing belts are connected in a one-to-one correspondence manner; the second synchronizing wheel, the second idler and the quantity of second hold-in range are two, just the second synchronizing wheel the second idler and the second hold-in range one-to-one connects.

As a preferable technical scheme of the variable-pitch shuttle car, the first transmission gear is located at the middle position between the two first synchronizing wheels, and the second transmission gear is located at the middle position between the two second synchronizing wheels.

As a preferable technical scheme of the variable-pitch shuttle vehicle, the driving source is a speed reduction motor, and the speed reduction motor drives the first driving shaft or the second driving shaft through a transmission assembly.

As a preferable technical scheme of the variable-pitch shuttle car, the transmission assembly comprises a driving wheel, a driven wheel and a transmission belt, the driving wheel is fixedly sleeved on an output shaft of the speed reduction motor, the driven wheel is fixedly sleeved on the first driving shaft or the second driving shaft, and the transmission belt is wound on the driving wheel and the driven wheel.

As a preferable technical scheme of the variable-pitch shuttle car, the driving wheel and the driven wheel are both gears, and the transmission belt is provided with driving teeth meshed with the driving wheel and the driven wheel.

As a preferable technical scheme of the variable-pitch shuttle car, the first idler and the second idler are respectively connected to an adjusting frame through corresponding idler shafts, adjusting holes formed in the adjusting frame in an extending mode along the conveying direction of the first synchronous belt and the second synchronous belt are formed in the adjusting frame, the end portions of the idler shafts extend into the adjusting holes, the idler shafts can move along the extending direction of the adjusting holes, and the idler shafts can be fixed through adjusting fixing components after being moved in place.

As a preferable technical scheme of the variable-pitch shuttle car, the adjusting and fixing assembly comprises an adjusting bolt and a fixing nut, a threaded hole communicated with the adjusting hole is formed in one side, facing the driving shaft, of the adjusting frame, the axis direction of the threaded hole is parallel to the extending direction of the adjusting hole, the adjusting bolt can extend into the adjusting hole through the threaded hole and can be abutted against the idler shaft, and the fixing nut can fix the adjusting bolt after the adjusting bolt is adjusted in place.

The utility model has the advantages that:

the utility model provides a displacement shuttle through setting up twice journey (two drive gear promptly) in two drive shafts departments, and two drive shafts arrange in the cavity of displacement shuttle's automobile body to can ensure that the middle supporting plate is located the intermediate position between removal fork and the fixed fork throughout when removing the fork and remove, can not influence whole car structure again, ensure that the whole car size of displacement shuttle does not change.

Drawings

Fig. 1 is a schematic structural diagram of a first view angle of a variable-pitch shuttle provided by an embodiment of the present invention;

fig. 2 is a schematic structural view of a second view angle of the pitch-variable shuttle provided in the embodiment of the present invention;

fig. 3 is a first schematic structural diagram of a pitch change mechanism according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram ii of a pitch change mechanism according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a partial enlarged view at B in FIG. 4;

fig. 7 is a schematic structural diagram three of a pitch change mechanism provided in the embodiment of the present invention;

FIG. 8 is an enlarged view of a portion of FIG. 7 at C;

fig. 9 is a cross-sectional view of an idler, an idler shaft, and an adjustment block in accordance with an embodiment of the present invention.

In the figure:

11. a first vehicle body; 12. a second vehicle body; 13. a guide shaft;

21. fixing the pallet fork; 211. a first end pallet; 22. moving the pallet fork; 221. a second end pallet;

30. a middle supporting plate;

40. a pitch change mechanism; 411. a first drive shaft; 412. a second drive shaft; 421. a first drive gear; 422. a second transmission gear; 431. a first synchronizing wheel; 432. a second synchronizing wheel; 441. a first idler pulley; 442. a second idler pulley; 443. an idler shaft; 451. a first synchronization belt; 4511. a first connection block; 452. a second synchronous belt; 4521. a second connecting block; 461. a reduction motor; 4611. mounting a bracket; 462. a drive wheel; 463. a driven wheel; 464. a transmission belt; 471. a first bearing housing; 472. a second bearing housing; 48. an adjusting frame; 481. an adjustment hole; 491. adjusting the bolt; 492. and (5) fixing the nut.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements relevant to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a variable-pitch shuttle, including a vehicle body, a fixed fork 21, a movable fork 22, an intermediate pallet 30, and a variable-pitch mechanism 40, wherein the vehicle body is a main structure for realizing movement of the variable-pitch shuttle, and the vehicle body includes a first vehicle body 11 and a second vehicle body 12 arranged at an interval, and a guide shaft 13 connected between the first vehicle body 11 and the second vehicle body 12; the fixed fork 21 is sleeved on the guide shaft 13 and is fixedly connected with the first vehicle body 11, the movable fork 22 is sleeved on the guide shaft 13 in a sliding manner, the movable fork 22 can move towards the direction close to or far away from the fixed fork 21, and the initial position of the movable fork 22 is close to the second vehicle body 12; a first end supporting plate 211 is arranged on one side of the fixed fork 21 facing the movable fork 22, a second end supporting plate 221 is arranged on one side of the movable fork 22 facing the fixed fork 21, and the first end supporting plate 211 and the second end supporting plate 221 are used for supporting the end of the container; the middle supporting plate 30 is slidably sleeved on the guide shaft 13 and is positioned between the movable fork 22 and the fixed fork 21, and the middle supporting plate 30 is used for supporting the middle part of the container; the distance-changing mechanism 40 is used for driving the movable fork 22 and the middle supporting plate 30 to move along the guide shaft 13, so that the distance between the movable fork 22 and the fixed fork 21 can be adjusted, meanwhile, the middle supporting plate 30 is adjusted to be always located at the middle position between the movable fork 22 and the fixed fork 21, accordingly, the distance-changing mechanism is suitable for containers with different specifications, the middle supporting plate 30 is guaranteed to be always stably supported in the middle of the container, and the phenomenon that the middle of the container is sagged is avoided.

In the present embodiment, as shown in fig. 3 to 9, the pitch varying mechanism 40 includes two driving shafts, two transmission gears, two sets of synchronizing wheels, two sets of idle gears, and two sets of timing belts, the two driving shafts are arranged in parallel, and one of the driving shafts is driven by a driving source; the two transmission gears are fixedly sleeved on the two driving shafts in a one-to-one correspondence mode respectively, are meshed with each other and have set transmission ratios; two groups of synchronous wheels are fixedly sleeved on the two driving shafts in a one-to-one correspondence mode respectively; the two groups of idle wheels correspond to the two groups of synchronous wheels one by one, and the two groups of idle wheels are positioned on the same side of the two driving shafts; the two groups of synchronous belts are respectively in one-to-one correspondence with the two groups of synchronous wheels and the two groups of idle wheels, and the synchronous belts are wound on the corresponding synchronous wheels and the corresponding idle wheels.

When the variable-pitch mechanism 40 is assembled with the body of the variable-pitch shuttle car, two driving shafts and a driving source can be located in a cavity of the first body 11, two sets of idler wheels are located in a cavity of the second body 12, one set of synchronous belts is connected with the movable pallet 22, the other set of synchronous belts is connected with the intermediate pallet 30, and a transmission ratio between a transmission gear in transmission connection with the movable pallet 22 and a transmission gear in transmission connection with the intermediate pallet 30 is set to be 2, so that the speeds of the two sets of synchronous belts are doubled, the moving distance between the movable pallet 22 and the intermediate pallet 30 is doubled (the moving distance of the movable pallet 22 is doubled as compared with the moving distance of the intermediate pallet 30), and the intermediate pallet 30 is ensured to be always located in the middle position between the movable pallet 22 and the fixed pallet 21.

The pitch-varying mechanism 40 provided by this embodiment has two driving shafts (i.e. two transmission gears) disposed at two driving shafts, and the two driving shafts can be disposed in a cavity of a body of the pitch-varying shuttle car, so that it can be ensured that the middle support plate 30 is always located at a middle position between the movable fork 22 and the fixed fork 21 when the movable fork 22 moves, and the structure of the whole shuttle car is not affected, and it is ensured that the size of the whole shuttle car of the pitch-varying shuttle car is not changed.

For convenience of description, two driving shafts are respectively named as a first driving shaft 411 and a second driving shaft 412, two transmission gears are respectively named as a first transmission gear 421 and a second transmission gear 422, two sets of synchronizing wheels are named as a first synchronizing wheel 431, the other set is a second synchronizing wheel 432, two sets of idle gears are named as a first idle gear 441, the other set is a second idle gear 442, two sets of synchronous belts are named as a first synchronous belt 451, and the other set is a second synchronous belt 452. The first transmission gear 421 and the first idle gear 431 are both fixedly sleeved on the first driving shaft 411, the second transmission gear 422 and the second idle gear 432 are both fixedly sleeved on the second driving shaft 412, the first idle gear 441 corresponds to the first idle gear 431, the second idle gear 442 corresponds to the second idle gear 432, the first synchronous belt 451 is wound on the first idle gear 431 and the first idle gear 441, and the second synchronous belt 452 is wound on the second idle gear 432 and the second idle gear 442, as shown in fig. 3.

Referring to fig. 3 and 4, the first timing belt 451 is provided with a first connecting block 4511, the first connecting block 4511 being used to connect with the moving fork 22, and the second timing belt 452 is provided with a second connecting block 4521, the second connecting block 4521 being used to connect with the intermediate pallet 30. By providing the first and second connection blocks 4511 and 4521, the connection of the first timing belt 451 to the moving fork 22 and the connection of the second timing belt 452 to the intermediate pallet 30 are facilitated.

The number of the first synchronizing wheels 431, the number of the first idle wheels 441 and the number of the first synchronizing belts 451 are two, and the first transmission gears 421 are located between the two first synchronizing wheels 431 in a one-to-one correspondence. Preferably, the first transmission gear 421 is located at a middle position of the two first synchronizing wheels 431. Through the above arrangement, the movable fork 22 can be more stably driven to move. The number of the second synchronizing wheels 432, the second idle wheels 442 and the second timing belts 452 is two, and the second transmission gears 422 are located between the two second synchronizing wheels 432. Preferably, the second transfer gear 422 is located at an intermediate position between the two second synchronizing wheels 432. Through the above arrangement, the intermediate supporting plate 30 can be more stably driven to move. Preferably, two second synchronizing wheels 432 are positioned between the two first synchronizing wheels 431, or two first synchronizing wheels 431 are positioned between the two second synchronizing wheels 432, so that the structural layout is more reasonable.

Referring to fig. 4 and 5, in the present embodiment, the driving source is a reduction motor 461, and the reduction motor 461 drives the first driving shaft 411 through a transmission assembly. Optionally, the transmission assembly includes a driving wheel 462, a driven wheel 463 and a transmission belt 464, the driving wheel 462 is fixedly secured to the output shaft of the reduction motor 461, the driven wheel 463 is fixedly secured to the first driving shaft 411, and the transmission belt 464 is wound around the driving wheel 462 and the driven wheel 463. The driving mode has simple structure and is convenient to implement. Preferably, the driving wheel 462 and the driven wheel 463 are both gears, and the transmission belt 464 is provided with driving teeth that mesh with the driving wheel 462 and the driven wheel 463. Through this setting, can increase the transmission moment of torsion, avoid skidding, improve drive efficiency.

Referring to fig. 5 and 6, in the present embodiment, the reduction motor 461 is mounted to the inner wall of the first vehicle body 11 through a mounting bracket 4611, the first driving axle 411 is mounted to the inner wall of the first vehicle body 11 through a first bearing seat 471, and the second driving axle 412 is mounted to the inner wall of the first vehicle body 11 through a second bearing seat 472.

Referring to fig. 7 to 9, the idler shaft 443 is connected to the adjustment frame 48 through the idler shaft 443, the adjustment frame 48 is mounted on the inner wall of the second vehicle body 12, the adjustment frame 48 is provided with an adjustment hole 481 extending in the conveying direction of the timing belt, the end of the idler shaft 443 extends into the adjustment hole 481, and the idler shaft 443 can move in the extending direction of the adjustment hole 481 and can be fixed by the adjustment fixing component after moving to a certain position. By moving the idler shaft 443 in the adjustment hole 481, the tightness of the synchronous belt can be adjusted, so that the synchronous belt can be mounted more conveniently.

The adjusting and fixing assembly comprises an adjusting bolt 491 and a fixing nut 492, one side of the adjusting frame 48 facing the driving shaft is provided with a threaded hole communicated with the adjusting hole 481, the axial direction of the threaded hole is parallel to the extension direction of the adjusting hole 481, the adjusting bolt 491 can extend into the adjusting hole 481 through the threaded hole and can be abutted to the idler shaft 443, and the fixing nut 492 can fix the adjusting bolt 491 after the adjusting bolt 491 is adjusted in place. The position of the idler shaft 443 can be adjusted by screwing in and out the adjusting bolt 491, and the adjusting mode is simple and convenient.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A pitch-variable shuttle, comprising:

the vehicle comprises a vehicle body and a control device, wherein the vehicle body comprises a first vehicle body (11) and a second vehicle body (12) which are arranged at intervals, and a guide shaft (13) connected between the first vehicle body (11) and the second vehicle body (12);

the fixed fork (21) is sleeved on the guide shaft (13) and is fixedly connected with the first vehicle body (11);

the movable fork (22) is sleeved on the guide shaft (13) in a sliding manner, and the movable fork (22) can move towards the direction close to or away from the fixed fork (21);

the middle supporting plate (30) is sleeved on the guide shaft (13) in a sliding mode and is positioned between the movable fork (22) and the fixed fork (21);

the variable-pitch mechanism (40) comprises two driving shafts which are arranged in parallel, the two driving shafts are arranged in a cavity of the first vehicle body (11) or the second vehicle body (12), the two driving shafts drive two groups of synchronous belts through gear transmission differential, and the two groups of synchronous belts are respectively used for driving the movable fork (22) and the middle supporting plate (30).

2. The pitch shuttle of claim 1, wherein said pitch mechanism (40) comprises:

a first drive shaft (411) and a second drive shaft (412) which are arranged in parallel and are both arranged in a cavity of the first vehicle body (11), one of the first drive shaft (411) and the second drive shaft (412) being driven by a drive source;

the first transmission gear (421) and the second transmission gear (422) are fixedly sleeved on the first driving shaft (411) and the second driving shaft (412) in a one-to-one correspondence mode respectively, the first transmission gear (421) is meshed with the second transmission gear (422), and the first transmission gear (421) and the second transmission gear (422) have a set transmission ratio;

the first synchronizing wheel (431) and the second synchronizing wheel (432) are fixedly sleeved on the first driving shaft (411) and the second driving shaft (412) in a one-to-one correspondence manner respectively;

a first idle wheel (441) and a second idle wheel (442) which are both arranged in a cavity of the second vehicle body (12), wherein the first idle wheel (441) and the second idle wheel (442) are respectively in one-to-one correspondence with the first synchronizing wheel (431) and the second synchronizing wheel (432);

the pallet fork mechanism comprises a first synchronous belt (451) and a second synchronous belt (452), wherein the first synchronous belt (451) is wound on a first synchronous wheel (431) and a first idle wheel (441), the second synchronous belt (452) is wound on a second synchronous wheel (432) and a second idle wheel (442), one of the first synchronous belt (451) and the second synchronous belt (452) is connected with the movable pallet fork (22), and the other one of the first synchronous belt (451) and the second synchronous belt (452) is connected with the intermediate pallet (30).

3. A distance-changing shuttle according to claim 2, characterised in that a first connecting block (4511) is provided on the first timing belt (451), a second connecting block (4521) is provided on the second timing belt (452), the first connecting block (4511) and the second connecting block (4521) being adapted to be connected to the moving fork (22) and the intermediate pallet (30), respectively.

4. The variable-pitch shuttle vehicle according to claim 2, wherein the number of the first synchronizing wheel (431), the first idle wheel (441) and the first synchronizing belt (451) is two, and the first synchronizing wheel (431), the first idle wheel (441) and the first synchronizing belt (451) are connected in a one-to-one correspondence; the number of the second synchronizing wheel (432), the second idle wheel (442) and the second synchronous belt (452) is two, and the second synchronizing wheel (432), the second idle wheel (442) and the second synchronous belt (452) are connected in a one-to-one correspondence manner.

5. A variable-pitch shuttle according to claim 4, characterized in that the first transmission gear (421) is located in an intermediate position between the two first synchronizing wheels (431) and the second transmission gear (422) is located in an intermediate position between the two second synchronizing wheels (432).

6. A variable-pitch shuttle vehicle according to claim 2, characterized in that the driving source is a reduction motor (461), the reduction motor (461) driving the first driving shaft (411) or the second driving shaft (412) through a transmission assembly.

7. The distance-changing shuttle according to claim 6, wherein the transmission assembly comprises a driving wheel (462), a driven wheel (463) and a transmission belt (464), the driving wheel (462) is fixedly sleeved on the output shaft of the speed-reducing motor (461), the driven wheel (463) is fixedly sleeved on the first driving shaft (411) or the second driving shaft (412), and the transmission belt (464) is wound on the driving wheel (462) and the driven wheel (463).

8. A variable pitch shuttle according to claim 7, wherein the drive wheel (462) and the driven wheel (463) are both toothed wheels, the drive belt (464) being provided with drive teeth meshing with the drive wheel (462) and the driven wheel (463).

9. The variable-pitch shuttle vehicle according to claim 2, wherein the first idler wheel (441) and the second idler wheel (442) are respectively connected to an adjusting frame (48) through corresponding idler wheel shafts (443), the adjusting frame (48) is provided with an adjusting hole (481) which extends and opens along the conveying direction of the first synchronous belt (451) and the second synchronous belt (452), the end of the idler wheel shaft (443) extends into the adjusting hole (481), and the idler wheel shafts (443) can move along the extending direction of the adjusting hole (481) and can be fixed through adjusting and fixing components after being moved to the right position.

10. The variable-pitch shuttle car according to claim 9, wherein the adjusting and fixing assembly comprises an adjusting bolt (491) and a fixing nut (492), one side of the adjusting frame (48) facing the driving shaft is provided with a threaded hole communicated with the adjusting hole (481), the axis direction of the threaded hole is parallel to the extending direction of the adjusting hole (481), the adjusting bolt (491) can extend into the adjusting hole (481) through the threaded hole and can be abutted against the idler shaft (443), and the fixing nut (492) can fix the adjusting bolt (491) after the adjusting bolt (491) is adjusted in place.

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