CN215100448U - Multi-station work bin lifting machine - Google Patents

Abstract

The utility model provides a multistation workbin lifting machine belongs to storage technical field. This workbin lifting machine is used for promoting the goods on the transfer chain to on the buffer memory goods position on the predetermined goods layer of goods shelves, includes: the bottom mounting platform is fixed on the ground; the guide mechanism is arranged on the bottom mounting platform; the lifting mechanism can lift along the guide mechanism; at least two side-by-side loading stations; and the driving mechanism is used for driving the lifting mechanism to lift. The utility model provides a multistation workbin lifting machine need not through the layer transfer chain when making the workbin carry, and the cost is reduced when saving space and this workbin lifting machine not only structure is more stable, makes the high unrestricted of lifting machine, and the platform of carrying cargo of multistation still makes the efficiency that the lifting machine transported the workbin higher moreover.

Description

Multi-station work bin lifting machine

Technical Field

The utility model belongs to the technical field of the storage, concretely relates to multistation workbin lifting machine.

Background

The warehousing technology mainly refers to a moving process of materials from entering a warehouse to being sent out again, and comprises the processes of warehousing, inspection, stacking, storing and delivering the materials out of the warehouse.

In the field of warehousing, the handling of the bins is the most important link, and corresponding lifting equipment is needed to convey goods to corresponding shelf levels. The multi-pass three-dimensional warehouse is used for vertically conveying the feeding boxes, the warehousing process of the bins in the multi-pass warehouse generally comprises the butt joint of the bin elevator and a feeding conveying line, the bins are transferred to a goods carrying platform of the elevator from the feeding conveying line, the goods carrying platform of the elevator lifts the bins to a specified layer according to requirements, the inter-layer conveying line which is in butt joint with the goods carrying platform on a goods shelf is butted, the bins are transferred to the inter-layer conveying line from the goods carrying platform, and a shuttle vehicle is responsible for transferring the bins to the corresponding goods positions from the inter-layer conveying line. The discharging process of the bin is opposite to the process. With the development of the technology, the multi-pass garage can be more than 20m, the height and the speed of the elevator can also be suitable for the multi-pass garage with the height of more than 20m, but the mechanical structure and the installation difficulty of the elevator are correspondingly complicated. Moreover, in a long and narrow multi-pass warehouse application scene, the traditional bin elevator can only be installed at two narrow ends of the multi-pass warehouse, and the installation quantity is limited.

In addition, because traditional lifting machine carries goods platform major structure and generally adopts cylinder transfer chain microscope carrier, the workbin need pass through the transfer chain between the layer when carrying, and when wearing storehouse height more highly when many, and traditional workbin lifting machine needs dozens of layers of transfer chain between the layer, both occupation space makes the material cost rise again. And traditional lifting machine carries cargo bed and generally adopts single station of carrying cargo, and conveying efficiency is low, and when goods shelves were higher or the workbin was heavier, traditional workbin lifting machine structure often is unstable inadequately moreover.

SUMMERY OF THE UTILITY MODEL

For solving the above problem, a multistation workbin lifting machine is provided for carry the goods, the utility model discloses a following technical scheme:

the utility model provides a multistation workbin lifting machine, a serial communication port, include: the bottom mounting platform is fixed on the ground; the guide mechanism is arranged on the bottom mounting platform; the lifting mechanism can lift along the guide mechanism; at least two side-by-side loading stations; and the driving mechanism is used for driving the lifting mechanism to lift.

The utility model provides a multistation workbin lifting machine can also have such characteristic, still includes: the top mounting platform is mounted at the top of the guide mechanism, the driving mechanism is provided with a driving motor mounted on the bottom mounting platform, a transmission assembly connected to the driving motor, a driving wheel connected to the transmission assembly, a driven wheel mounted on the top mounting platform and a synchronous belt sleeved on the driving wheel and the driven wheel, and the synchronous belt synchronously rotates along with the driving wheel under the driving of the driving motor.

The utility model provides a multistation workbin lifting machine can also have such characteristic, and wherein, guiding mechanism sets up to the stand corresponding with the hold-in range, and this stand extends along vertical direction to the top and the bottom of this stand are connected with bottom mounting platform and top mounting platform through the corner fitting respectively.

The utility model provides a multistation workbin lifting machine can also have such characteristic, and wherein, the action wheel, the quantity from driving wheel, hold-in range and stand are two, are connected through universal joint between two action wheels, and elevating system sets up between two stands.

The utility model provides a simple and easy multistation workbin lifting machine can also have such characteristic, and wherein, two at least stations that carry cargo are connected side by side on same horizontal plane, along guiding mechanism with the lift.

The utility model provides a multistation workbin lifting machine can also have such characteristic, wherein, it gets the goods subassembly to have on the station to carry cargo, get to put the goods subassembly and have bearing part, two at least flexible arms and dial and get the module, bearing part has the bearing face, be used for the bearing workbin, two flexible arms set up respectively on bearing part, it stretches out and draws back in order to get to put the workbin to move the year direction along the workbin to configure into, it sets up on flexible arm to dial and get the module, follow flexible arm and move the year direction removal along the goods, be used for dialling to get or push away the workbin.

The utility model provides a multistation workbin lifting machine can also have such characteristic, and wherein, the module of getting of dialling has driving lever and driving lever driving motor, and driving lever one end is rotationally installed on the flexible arm that corresponds, and driving lever driving motor fixed mounting is on flexible arm for driving the driving lever rotates in order to dial and get or push away the workbin.

The utility model provides a multistation workbin lifting machine, can also have such characteristic, wherein, elevating system includes the hoisting frame, the hoisting frame has U type support, the leading wheel subassembly, hold-in range tensioning subassembly and supporting beam, get and put goods subassembly fixed mounting on U type support, the both ends of hold-in range are fixed respectively on U type support, the leading wheel subassembly is installed on U type support, cooperate with the stand that corresponds and go up and down to lead to U type support, the tip at the hold-in range is installed to hold-in range tensioning subassembly, be used for the tensioning hold-in range, supporting beam connects at U type support both ends top.

The utility model provides a multistation workbin lifting machine can also have such characteristic, and wherein, U type support has support base and upwards extends two curb plates corresponding with two stands along vertical direction from the both ends of this support base.

The utility model provides a multistation workbin lifting machine, can also have such characteristic, wherein, the leading wheel subassembly is installed on two curb plates, at least one first leading wheel of axis along first direction has, at least one second leading wheel and the at least one third leading wheel of axis along the second direction of axis along first direction, thereby the second leading wheel can to the direction removal of being close to or keeping away from the first leading wheel that corresponds cooperate with tight or loosen the stand that corresponds with first leading wheel, thereby the third leading wheel can move to the direction that is close to or keeps away from the stand that corresponds and compress tightly or loosen the stand, first direction and second direction mutually perpendicular.

Utility model with the functions and effects

According to the utility model discloses a workbin lifting machine has thereby and is used for dialling from the transfer chain and gets the workbin or push away the workbin and put to two at least cargo carrying stations of buffer memory goods position traditional cylinder transfer chain microscope carriers. Therefore, the material box does not need to pass through an interlayer conveying line during conveying, the material box only needs to be directly lifted to a preset goods layer from a goods loading station, goods are placed on the goods shelf cache goods position through the actions of poking and pushing, and then the shuttle vehicle transfers the goods position. Therefore, the utility model discloses a workbin lifting machine, mounted position is nimble changeable more, and the commonality is higher, has solved traditional workbin lifting machine and has needed to install in the problem of wearing comparatively fixed position at storehouse two more. And when the height of the multi-pass warehouse is higher, a multi-layer interlayer conveying line can be omitted by using the hoister, so that the space is saved, and the manufacturing and installation costs are reduced.

And simultaneously, the utility model discloses a multistation workbin lifting machine's at least two stations that carry cargo are installed on elevating system, and elevating system sets up between two stands of guiding mechanism, compares with the structure of current single station that carries cargo, when goods shelves are higher or the workbin is heavier, the utility model discloses a workbin lifting machine's structure is more stable. And a plurality of cargo-carrying stations work simultaneously and lift simultaneously, so that the transportation time is saved, and the system is more efficient.

Drawings

FIG. 1 is a schematic perspective view of a bin elevator according to an embodiment of the present invention;

FIG. 2 is a schematic view of a lifting frame of a lifting mechanism of a bin elevator according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a synchronous belt tensioning assembly in a lifting mechanism of a hoisting machine according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a cargo picking and placing assembly in a lifting mechanism of the elevator according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a driving mechanism of the bin elevator in the embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples.

< example >

The present embodiment provides a multistation workbin elevator 100.

And the bin elevator 100 is used for elevating the bins on the conveying line to a buffer storage goods position of a preset goods layer of the shelf, wherein the bin elevator 100 is the bin elevator as described below.

Fig. 1 is a schematic perspective view of a bin elevator according to an embodiment of the present invention.

As shown in fig. 1, the bin lift 100 comprises a bottom mounting platform 1, a top mounting platform 2, a guide mechanism 3, a lifting mechanism 4, a drive mechanism 5, and two loading stations.

The bottom mounting platform 1 is fixed on the ground and serves as a base of the whole elevator 100, so that the flatness of the foundation of the elevator 100 can be guaranteed.

And the top mounting platform 2 is mounted on the top of the guide mechanism 3.

The guide mechanism 3 is installed on the bottom mounting platform 1, and is used for guiding the lifting mechanism to lift, and serves as a main stress structure of the whole lifting machine 100. Wherein, guiding mechanism 3 sets up to two stands 31 corresponding with hold-in range 55, and stand 31 adopts the aluminium alloy of standard cross-section, and two stands 31 extend along vertical direction to the top and the bottom of two stands 31 are connected with bottom mounting platform 1 and top mounting platform 2 through corner fittings 32 respectively.

The lifting mechanism 4 includes a lifting frame 42 disposed between the two uprights 31.

Lifting frame 42 fig. 2 is a schematic structural view of a lifting frame in a lifting mechanism of a material box lifting machine according to an embodiment of the present invention.

As shown in fig. 2, the lifting frame 42 can move up and down along the guide mechanism 3, and the lifting frame 42 has a U-shaped bracket 421, a guide wheel assembly 422, a timing belt tension assembly 423, and a supporting beam 424 connected to the top of both ends of the U-shaped bracket 421.

The pick-and-place assembly 41 can be mounted on the U-shaped bracket 421, the U-shaped bracket 421 has a bracket base 421a made of a profile and two side plates 421b extending from two ends of the bracket base 421a in the vertical direction and corresponding to the two upright posts 31, and two ends of the timing belt 55 are respectively fixed on the side plates 421 b.

The guide wheel assembly 422 is matched with the corresponding upright column 31 to guide the lifting of the U-shaped support 421. In this embodiment, the guide wheel assembly 422 is mounted on the two side plates 421b, and has two first guide wheels 422a having axes along the first direction, two second guide wheels 422b having axes along the first direction, and two third guide wheels 422c having axes along the second direction. Wherein the first direction and the second direction are perpendicular to each other. At least one of the first guide wheel 422a and the second guide wheel 422b is adjustable, and the third guide wheel 422c is also adjustable.

The second guide wheels 422b may be moved toward or away from the corresponding first guide wheels 422a to cooperate with the first guide wheels 422a to clamp or unclamp the corresponding columns 31. That is, when the second guide wheel 422b approaches the first guide wheel 422a, the abutting surfaces of the first guide wheel 422a and the second guide wheel 422b and the upright column 31 maintain a clamping state; when the second guide wheel 422b is far away from the first guide wheel 422a, the first guide wheel 422a and the second guide wheel 422b are kept in a loose state with the upright column 31.

The third guide wheel 422c can also move towards the direction close to or away from the corresponding upright column 31 so as to press or release the upright column 31, namely when the third guide wheel 422c is close to the upright column 31, the abutting surface of the third guide wheel 422c presses the upright column 31; when the third guide wheel 422c moves away from the column 31, the third guide wheel 422c releases the column 31.

A timing belt tensioning assembly 423 is mounted on the side plate 421b for tensioning the timing belt 55.

Fig. 3 is a schematic structural diagram of a synchronous belt tensioning assembly of an embodiment of the present invention.

As shown in fig. 3, the timing belt pressing assembly 423 has an upper pressing plate 423a, a lower pressing plate 423c, and supporting wheels 423b installed between the upper pressing plate 423a and the lower pressing plate 423 c.

The corresponding surface of the two side plates 421b is the inner side of the side plates.

In this embodiment, one end of the timing belt 55 bypasses the driving pulley 53 and is installed on the inner side of the side plate 421b, i.e., the lower pressing plate 423c is used to press and fix the end of the timing belt 55 on the inner side of the side plate 421b of the lifting frame. The other end of the timing belt 55 is wound around a driven pulley 54 installed at the top mounting platform 2, passes through an upper pressing plate 423a, and is installed in a timing belt tension assembly 423 around a supporting pulley 423 b. The synchronous belt tensioning assembly 423 is pulled upwards through the bolt to drive the end part of the synchronous belt 55 to move upwards, so that the synchronous belt 55 is tensioned, and the other end of the synchronous belt 55 is pressed and fixed on the lifting frame side plate 421b by the upper pressing plate 423a after the synchronous belt 55 is tensioned.

The two loading stations are connected in parallel on the same horizontal plane, are arranged on the lifting mechanism 4 and lift along the upright column 31.

The two load stations are embodied as two pick-and-place assemblies 41 mounted on a lifting frame 42. The lifting frame 42 and the two pick-and-place assemblies 41 as a whole can be lifted and lowered along the two upright columns 31.

Fig. 4 is a schematic structural view of a cargo taking and placing assembly in a lifting mechanism of a bin elevator according to an embodiment of the present invention.

As shown in fig. 4, the pick-and-place unit 41 is disposed in the lifting mechanism 4 and can move up and down along the guide mechanism 3, and the pick-and-place unit 41 includes a support member 411, two telescopic arms 412, and a picking module.

The support member 411 is U-shaped and has a support base 411a and two support side walls 411b for supporting the cargo.

The two telescopic arms 412 are respectively provided on the support member 411, and are arranged to be telescopic in the cargo transfer direction to pick and place the cargo. In the initial state, i.e., when the pick-and-place assembly 41 is not performing the pick-and-place operation, the telescopic arm 412 is located in the supporting member 411, that is, the end of the telescopic arm 412 does not exceed the opening end face of the supporting member 411. When the goods need to be picked and placed, the telescopic arm 412 may extend out of the opening end face of the bearing component 411, and the goods can be picked up by the picking module and then can be retracted without exceeding the opening end face of the bearing component 411.

The picking module is provided with a picking lever 413 and a picking lever driving motor, is arranged on the telescopic arm 412, and moves along the cargo transferring direction along with the telescopic arm 412, namely the telescopic arm 412 can stretch in the direction close to or far away from the cargo in the horizontal plane, so as to pick or push the cargo.

One end of the lever 413 is rotatably mounted to the corresponding telescopic arm 412.

The driving motor of the shift lever 413 is fixedly arranged on the telescopic arm 412 and is used for driving the shift lever 413 to rotate so as to be capable of shifting or pushing goods.

The opposite face of the two telescoping arms 412 is the inner wall of the telescoping arm.

When the goods need to be shifted, the shifting lever 413 rotates from the inner wall of the telescopic arm 412 which is not extended in the vertical state to the inner wall extending out of the telescopic arm 412, so that the shifting lever is attached to the vertical surface on one side of the goods, and the goods are shifted along with the movement of the telescopic arm 412. Under the initial condition, namely, when the picking and placing assembly 41 does not pick and place, the shift lever 413 is in a vertical state (extends along the vertical direction), when picking and placing the goods, the telescopic arm 412 extends out of the two sides of the goods from the bearing part 411, the shift lever 413 is put down under the driving of the shift lever driving motor, namely, the shift lever 413 is rotated to a horizontal state (extends along the horizontal direction), at this moment, the two shift levers 413 at the same end of the two telescopic arms 412 point to the center of the end face of the goods, so that the shift lever 413 can be attached to the end face of the goods to shift the goods.

Fig. 5 is a schematic structural diagram of a driving mechanism of the bin elevator in the embodiment of the present invention.

As shown in fig. 5, a driving mechanism 5 for driving the elevating mechanism 4 to ascend and descend.

Through actuating mechanism 5's drive, elevating system 4 carries out elevating movement along guide structure 3, has realized the transportation of goods, realizes promptly that the workbin from getting put goods subassembly 41 to the shifting of goods shelves workbin buffer position or transfer chain. In this embodiment, the driving mechanism 5 has a driving motor 51 installed on the bottom mounting platform 1, a transmission assembly 52 connected to the driving motor, two driving wheels 53 connected to the transmission assembly, two driven wheels 54 installed on the top mounting platform, two synchronous belts 55 sleeved on the two driving wheels 53 and the two driven wheels, and two transmission boxes 56 (mounting seats). Wherein the two driving wheels are respectively installed in the two transmission boxes 56 (installation seats).

Under the driving of the driving motor 51, the two timing belts 55 rotate synchronously with the two driving pulleys 53.

The transmission assembly 52 is embodied by a gear coupling 521, a drive shaft 522 and a universal coupling 523. An output shaft of the driving motor 51 is in transmission connection with an input shaft of the driving shaft 522 through a gear coupling 523, a driving wheel 531 close to the driving motor 51 is fixed on a driving shaft 5252, one side of a universal coupling 523 is in transmission connection with the output shaft of the driving shaft through a flange, and the other side of the universal coupling 523 is connected with a driving wheel 532 far away from the driving motor, namely, the two driving wheels 53 are connected through the universal coupling 523.

The concrete action process that the workbin lifting machine promoted the goods in this embodiment is as follows:

the driving motor 51 drives the driving wheel 53 to rotate through the transmission component 52, the lifting frame 42 is lifted to the buffer storage goods position of the preset goods layer of the goods shelf along the upright column 31 through the transmission of the synchronous belt 55, and then the goods are pushed to the buffer storage goods position by the goods taking and placing component 41 arranged on the lifting frame 42, so that the whole process of lifting the goods by the lifting machine is completed.

Examples effects and effects

According to the embodiment of the utility model provides a workbin lifting machine has and is used for dialling the goods from the transfer line or pushes away the goods and put two of buffer memory goods position and get the goods subassembly, adopts the flexible fork structure to dial promptly and gets and the load that carries of propelling movement goods realization goods to replace traditional cylinder transfer chain microscope carrier, can save the transfer chain between the multilayer layer, especially when wearing storehouse height more, adopt this lifting machine not only to save storage space but also to reduce the cost of making and installing.

In addition, the bin elevator adopts two cargo-carrying station structures which are arranged in parallel, so that the transportation time of the elevator is saved, and the bin transportation efficiency is further improved.

In addition, a guide mechanism of the hoister is installed on the bottom installation platform, and the tops and the bottoms of the two stand columns are connected with the bottom installation platform and the top installation platform through corner pieces respectively. The lifting mechanism is arranged between the two upright posts, and the two cargo carrying stations are arranged on the U-shaped support of the lifting mechanism. The lifting machine of this embodiment structure is comparatively simple, easily in production and manufacturing, and this lifting machine overall structure is more stable moreover, and when goods shelves were higher, the height of the lifting machine of this embodiment can be unrestricted.

Additionally, the embodiment of the utility model provides a workbin lifting machine has a driving motor, and under driving motor's drive, the hold-in range carries out synchronous rotation along with the action wheel, drives two stations that carry cargo and with going up and down, compares in the structure that a driving motor of conventionality can only drive a station that carries cargo, and the lifting machine of this embodiment can reduce manufacturing cost.

In addition, the work bin is not required to pass through an interlayer conveying line during conveying, the work bin is directly lifted and placed on a goods shelf cache goods position by a telescopic fork carrying platform, and then the shuttle car is used for carrying and placing a specified goods position. Therefore, the buffer storage goods position of the goods shelf is not limited, and compared with the traditional interlayer conveying line, the buffer storage goods position is more flexible to set and can be arranged at any position of the goods layer of the goods shelf.

And simultaneously, the utility model discloses a workbin lifting machine mounted position is nimble changeable more, and the commonality is higher, has solved traditional workbin lifting machine and has needed to install in the comparatively fixed position's of wearing storehouse two more problem. Under the application scene of the long and narrow multi-pass warehouse, the hoister can be arranged in a goods shelf or at any position beside the goods shelf, the installation number of the hoister can be unlimited, the operation efficiency of the whole multi-pass warehouse is greatly improved, and the application scene is wider.

In addition, the upright post of the guide mechanism adopts the aluminum profile with the standard section, and can be directly purchased from an aluminum profile manufacturer, so that the traditional steel upright post processing process or the aluminum profile upright post die sinking extrusion process is omitted; and meanwhile, the bracket base of the lifting frame is made of a section bar. The selected manufacturing materials reduce the whole weight of the elevator, save energy and improve efficiency.

The above embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above embodiments.

In this embodiment, elevating system has two and gets and puts goods subassembly for dial the goods or put the goods to the buffer memory goods position from the transfer chain, can promote the conveying efficiency of goods. In other embodiments, the lifting mechanism may also be provided with more goods taking and placing assemblies, and the above all can enable the elevator to realize the transfer function of goods from the goods carrying platform to the buffer goods position through the actions of taking and pushing.

Claims (10)

1. A multistation workbin lifting machine which characterized in that includes:

the bottom mounting platform is fixed on the ground;

the guide mechanism is arranged on the bottom mounting platform;

the lifting mechanism can lift along the guide mechanism;

at least two parallel cargo stations mounted on the lifting mechanism; and

and the driving mechanism is used for driving the lifting mechanism to lift.

2. The multi-station bin elevator of claim 1, further comprising:

a top mounting platform mounted on the top of the guide mechanism,

the driving mechanism is provided with a driving motor arranged on the bottom mounting platform, a transmission assembly connected to the driving motor, a driving wheel connected to the transmission assembly, a driven wheel arranged on the top mounting platform, and a synchronous belt sleeved on the driving wheel and the driven wheel, wherein the synchronous belt is driven by the driving motor and rotates synchronously with the driving wheel.

3. A multi-station bin elevator as claimed in claim 2, wherein:

the guide mechanism is arranged to be an upright post corresponding to the synchronous belt, the upright post extends in the vertical direction, and the top and the bottom of the upright post are connected with the bottom mounting platform and the top mounting platform through corner pieces respectively.

4. A multi-station bin elevator as claimed in claim 3, wherein:

wherein the number of the driving wheel, the driven wheel, the synchronous belt and the upright post is two,

the two driving wheels are connected through a universal coupling,

the lifting mechanism is arranged between the two upright posts.

5. The multi-station bin elevator as set forth in claim 1, wherein:

at least two loading stations are connected in parallel on the same horizontal plane and rise and fall along the guide mechanism.

6. The multi-station bin elevator as set forth in claim 1, wherein:

wherein, the goods carrying station is provided with a goods taking and placing component,

the goods taking and placing component is provided with a supporting component, at least two telescopic arms and a taking module,

the supporting part is provided with a supporting surface for supporting the material box,

the two telescopic arms are respectively arranged on the supporting component and are configured to be telescopic along the material box shifting direction so as to take and place the material box,

the poking module is arranged on the telescopic arm and follows the telescopic arm to move along the moving direction of the material box, and is used for poking or pushing the material box.

7. A multistation workbin hoist according to claim 6, characterized in that:

wherein the poking module is provided with a poking rod and a poking rod driving motor,

one end of the shift lever is rotatably arranged on the corresponding telescopic arm,

the driving lever driving motor is fixedly arranged on the telescopic arm and used for driving the driving lever to rotate so as to be capable of picking or pushing the material box.

8. A multi-station bin elevator as claimed in claim 3, wherein:

wherein the lifting mechanism comprises a lifting frame which is provided with a U-shaped bracket, a guide wheel component, a synchronous belt tensioning component and a supporting beam,

the loading station is fixedly arranged on the U-shaped bracket,

two ends of the synchronous belt are respectively fixed on the U-shaped bracket,

the guide wheel component is arranged on the U-shaped bracket and is matched with the corresponding upright post to guide the lifting of the U-shaped bracket,

the synchronous belt tensioning assembly is arranged at the end part of the synchronous belt and is used for tensioning the synchronous belt,

the supporting cross beam is connected to the tops of two ends of the U-shaped support.

9. A multi-station bin elevator as claimed in claim 8, wherein:

the U-shaped support is provided with a support base and two side plates which extend upwards from two ends of the support base along the vertical direction and correspond to the two upright posts.

10. A multi-station bin elevator as claimed in claim 8, wherein:

wherein the guide wheel assembly is mounted on both of the side plates and has at least one first guide wheel having an axis in a first direction, at least one second guide wheel having an axis in the first direction, and at least one third guide wheel having an axis in a second direction,

the second guide wheel can move towards the direction close to or far away from the corresponding first guide wheel so as to be matched with the first guide wheel to clamp or release the corresponding upright post,

the third guide wheel can move towards the direction close to or far away from the corresponding upright column so as to press or release the upright column,

the first direction and the second direction are perpendicular to each other.

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