CN111332672A - a stack system - Google Patents

Abstract

The invention relates to a stacking system, which comprises a stacking track, a stacking vehicle arranged on the stacking track, storage racks arranged on two sides of the stacking track, a transfer platform arranged on one side of the stacking track and positioned on one side of the storage racks, the storage rack comprises a plurality of layer racks which are stacked in sequence from bottom to top, a plurality of storage channels are arranged on each layer rack, a walking channel is arranged at the front end of each storage channel on each layer rack, two first walking tracks are arranged on the walking channel, two storage tracks are arranged in each storage channel, a second walking track connected with each storage track is arranged between the two first walking tracks on the walking channel, the four-way vehicle is arranged on the walking channel and used for moving the storage track and the second walking track back and forth, the four-way vehicle can walk along the first walking track, and a cross beam frame used for placing articles is arranged above the four-way vehicle on the walking channel. The stacking system solves the technical problems of wide occupied area and low working efficiency of the existing stacking system.

Description

a stack system

technical field

The present invention relates to a stacking system.

Background technique

At present, the existing warehousing system has shown the trend of intelligence and automation. For example, Chinese Patent No.: CN201110028000.9 discloses a warehousing method and equipment for an intensive logistics warehouse. The technical solution adopted is: a warehousing intensive logistics warehouse The method is characterized in that: the storage method divides the goods into different types according to the different shipments of goods of different brands in the warehouse, and stores the different types of goods in different locations of the logistics warehouse, using different types of goods. Outbound method outbound. The beneficial effects of the invention are: the intensive warehouse overcomes the disadvantages of traditional logistics warehouses for storing goods according to the order of storage time or different types of goods, and has the functions of classifying storage according to the brand of goods and sorting out the warehouse according to order requirements. , effectively realize the intensive storage of goods, ensure the full utilization of warehouse space, and at the same time, the operation sequence is flexible and diverse, which reduces the storage cost of goods, and achieves the purpose of efficiently storing and sorting goods of different brands.

However, the existing stacking system still has the technical problems of wide area and low work efficiency.

SUMMARY OF THE INVENTION

Therefore, in view of the above-mentioned problems, the present invention proposes a stacking system, which solves the technical problems of wide area and low working efficiency of the existing stacking system.

In order to achieve the above object, the present invention has adopted the following technical solutions: a stacking system, comprising a stacking track, a stacking cart arranged on the stacking track, a storage rack arranged on both sides of the stacking track, a stacking track located on one side and located in the storage rack. A transfer platform on one side of the rack, the storage rack includes a plurality of racks stacked in sequence from bottom to top, each rack is provided with a plurality of storage channels, and each rack is provided with a walking channel at the front end of each storage channel, so Two first walking rails are arranged on the walking channel, two storage rails are arranged in each storage channel, and a second walking rail connecting each storage rail is arranged on the walking channel between the two first walking rails. There is a four-way car on the walking channel for going back and forth between the storage track and the second walking track, the four-way car can travel along the first walking track, and a four-way car is provided on the walking channel above the four-way car for placing items. Beam frame.

Further, the four-way cart includes a body, a lift lock pin that can be lifted up and down on the body, and a lift drive device provided on the body for driving the lift lock pin. The stacker includes a body, which can be extended and retracted along the body. The fork arm and the telescopic drive device used for driving the fork arm on the body, the distance between the adjacent two beam frames is greater than the width of the four-way vehicle, and the fork arm is provided with a clamping slot corresponding to the lifting lock pin .

Further, the layer frame includes a horizontal bar and a vertical bar, the vertical bars are respectively provided with support plates at the front and rear ends of the walking passage, and the support plates include U-shaped brackets that are clamped and locked on the vertical bars. , a transverse bracket arranged on the side of the U-shaped bracket, a rib plate connected to the transverse bracket and the U-shaped bracket, and the transverse beam bracket is detachably arranged on the rib plate.

Further, the rib plate and the transverse support are respectively fixedly connected to the transverse rod.

Further, a bending reinforcing plate is provided on the peripheral portion of the rib plate which is not connected with the transverse bracket and the U-shaped bracket.

Further, the beam frame includes a square tube body and a plurality of reinforcing ridges arranged on the inner wall of the square tube.

Further, two or more connecting pieces are used for reinforcing connection between two adjacent second walking rails, and at least two connecting pieces are in a crisscross state.

Further, the stacking vehicle includes a walking support for walking on the stacking track, a walking driving device arranged on the walking support, a lifting bracket arranged on the walking support, a lifting seat that can move up and down along the lifting support, and is used for driving. A lift drive device for lifting the lift seat, a telescopic fork arm provided on the lift seat, and a telescopic fork arm drive device provided on the lift seat for driving the telescopic fork arm, the walking support comprises a main body part and is provided on both sides of the main body part The horizontal support part, two or more pairs of walking wheels arranged on the lower end of the horizontal support part, and a guide support part located on the outer side of the walking wheels on the horizontal support part, each pair of walking wheels respectively abuts on the upper end surface of the stack track, the said A first sliding rail is arranged on the outer side of the stacking rail, and the guide support part cooperates with the first sliding rail to realize sliding and clamping. There is a walking rack, and the walking gear meshes with the walking rack to realize transmission. The lifting bracket includes two side frames and a transverse frame connected to the upper end of the two side frames. The side frames are surrounded by at least three uprights. The two adjacent columns are connected by a plurality of transverse columns.

Further, the lifting base is respectively provided with a guide wheel mechanism clamped on both sides of the two sides of the frame, the guide wheel mechanism includes a guide wheel seat that contacts and abuts with the two side surfaces of the column, and can slide along the guide wheel seat. A bearing seat, a guide wheel rotatably arranged on the bearing seat, the guide wheel seat is provided with a top pressure spring for realizing the bearing seat abutting against the column, and two guide wheel seats are distributed up and down on each guide wheel seat. guide wheel above.

Further, two vertical columns of each side frame are provided with lifting racks, the lifting driving device is a biaxial motor, and lifting gears are respectively provided on both ends of the rotating shaft of the biaxial motor, and each lifting gear is respectively connected with each lifting gear. Rack meshing transmission.

By adopting the foregoing technical scheme, the beneficial effects of the present invention are:

1. Through the setting of such a stacking system, firstly, the problem that the existing stacking system needs to go back and forth can be changed. The biggest disadvantage of the round trip is the long distance, which makes the battery not durable. The existing four-way car can usually be used for 6 hours on a single charge, that is, if it runs at full load, at least four four-way cars are required, and the cost increases at the same time. , will also affect the battery life of the four-way vehicle. In addition, in extreme use environments, such as storage in cold storage and freezer storage, the battery life of the four-way vehicle will be greatly reduced, and it can only be used for 3-4 hours. Efficiency drops again. Second, it can change the problem of inefficiency of the existing stacking system. The transfer of goods from the stacking channel to the transfer platform often requires a long distance. This distance wastes both time and electricity, making the overall cargo flow efficiency low. . Third, it can change the problem of the existing stacking system. In order to achieve higher efficiency, the existing stacking system often adopts a structure that occupies a wider area and stacks a large number of single-layer shelves. The truck uses a lift at a fixed position to realize the transfer of goods between the shelves, so the efficiency is low, so it has this structure. However, this solution does not have these defects. Compared with the existing stacking system, it can achieve dense and high-level storage. It can use four-way vehicles to transport the goods in the storage channel to the walking channel, and place the goods in the On the walking channel, and then use the stacker to take out the goods from the walking channel and send them to the transfer platform. At the same time, the four-way vehicle can go to another storage channel again to take out the goods again. Instead, the process for storing goods is similar. In addition, multiple four-way vehicles can be installed on the same shelf, which will not have a blocking problem like the existing stacking system. In this solution, the four-way vehicles on one shelf can quickly shuttle. For each storage channel and walking channel, the storage channel becomes the avoidance area.

2. Due to the dense storage area, these four-way vehicles will also have a maintenance problem, because it is difficult for people to enter and exit in the dense area, and these heavy four-way vehicles cannot be effectively handled. In this solution, the stacker can be used to fork the four-way car, so as to realize the removal and maintenance of the four-way car, but the stability of the fork is weak. It can effectively realize the fixing of the stack car, so as to realize the effective fork and transfer.

3. Through the structural setting of the support plate, its installation performance and stability can be achieved, and the purpose of effective beam frame support can be achieved. The rib plate and the transverse support are fixedly connected with the transverse rod respectively, in order to improve the supporting performance. A bending reinforcing plate is provided on the peripheral part of the rib which is not connected with the transverse bracket and the U-shaped bracket, also to improve the support performance.

4. The beam frame includes a square tube body and a plurality of reinforcing ridges arranged on the inner wall of the square tube, in order to improve the performance of the beam frame itself to carry goods.

5. The two adjacent second walking rails are reinforced and connected by more than two connecting pieces, and at least two connecting pieces are in a crisscross state, which can effectively improve the support purpose and effectively realize the purpose of carrying goods on the walking channel.

6. The setting of the stack car can realize that only the lower track is set, and the upper sky rail is not needed, which realizes the advantages of convenient installation, cost saving, and no need to have the roof board. It can achieve higher support performance and support strength through the setting of the lifting bracket.

7. The setting of the guide wheel mechanism can effectively achieve the purpose of guiding, preventing deviation and good guiding stability, and can prevent the instability of the lifting seat due to the absence of the overhead rail, and effectively improve the work efficiency.

8. Effective drive can be achieved through the cooperation of the lifting rack and the dual-axis motor.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the right side view of Fig. 1;

Fig. 3 is the three-dimensional structure schematic diagram of the storage rack;

Figure 4 is a front view of the storage rack;

Fig. 5 is the left side view of Fig. 4;

Fig. 6 is the enlarged view of A place in Fig. 3;

Fig. 7 is the structural representation of beam frame;

Figure 8 is a three-dimensional schematic diagram of a four-way vehicle;

Fig. 9 is the side view structure schematic diagram of the four-way vehicle;

Figure 10 is a schematic structural diagram of a fork arm of a four-way vehicle and a stacker;

Figure 11 is a three-dimensional schematic diagram of the stacking car and the stacking track;

Figure 12 is a front view of the stacker;

Figure 13 is an enlarged top view of the stacker;

Figure 14 is an enlarged view of the right side of the stacker.

Detailed ways

The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

1 to 9, the present embodiment provides a stacking system, including a stacking rail 1, a stacking cart 2 arranged on the stacking rail 1, storage racks 3 arranged on both sides of the stacking rail 1, and a stacking rail 1-1 The transfer platform 4 is located on one side of the storage rack, the storage rack 3 includes a plurality of racks 31 stacked in sequence from bottom to top, each rack 31 is provided with a plurality of storage channels 32, and each rack 31 is located on each rack. The front end of the storage channel 32 is provided with a walking channel 33 , two first walking rails 331 are arranged on the walking channel 33 , two storage rails 321 are arranged in each storage channel 32 , and two first walking rails 321 are arranged on the walking channel 33 . A second traveling track 332 connecting the storage tracks is provided between the traveling tracks 331 , and a four-way cart 5 for going back and forth between the storage track 321 and the second traveling track 332 is provided on the traveling channel 33 . Walking along the first walking track 331 , a beam frame 333 for placing articles is provided on the walking channel 33 above the four-way vehicle 5 . The shelf 31 includes a horizontal rod 311 and a vertical rod 312 . The vertical rod 312 is provided with support plates 34 on the front and rear ends of the walking channel 33 respectively. The upper U-shaped bracket 341 , the lateral bracket 342 provided on the side of the U-shaped bracket 341 , and the rib 343 connected to the lateral bracket 342 and the U-shaped bracket 341 . The rib 343 and the transverse support 342 are respectively fixedly connected to the transverse rod 311 through a fixing member 344 . A bent reinforcing plate 3431 is provided on the peripheral portion of the rib 343 that is not connected with the transverse bracket 342 and the U-shaped bracket 341 . The beam frame 333 includes a square tube body 3331 and a plurality of reinforcing ribs 3332 arranged on the inner wall of the square tube body 3331 . Two or more connecting pieces 334 are used for reinforcement connection between two adjacent second walking rails 332, and at least two connecting pieces 334 are in a crisscross state. In this solution, the connecting pieces between two adjacent second walking rails 332 are 334 is two, both are pipes, such as square pipes or round pipes, and their materials can be aluminum profiles or steel.

The four-way vehicle 5 includes a main body 51 , a lift lock pin 52 that can be lifted up and down on the main body 51 , and a lift drive device 53 arranged on the body 51 for driving the lift lock pin 52 . The lift drive device 53 is: Electric push rod, the telescopic structure is well known, and will not be described here.

The stacker 2 includes a main body, a fork arm 2a that can be extended and retracted along the main body, and a telescopic drive device arranged on the main body for driving the fork arm. The fork arm 2a is provided with a clamping groove 2b corresponding to the lifting lock pin. The clamping slot 2b may be a through slot.

The above-mentioned four-way cart and stacking cart are existing devices. The four-way cart is equipped with a lift drive device and a lift lock pin, and a clamping slot is provided on the fork arm of the stack cart. The above-mentioned storage rack is an existing device, but a walking channel and other components are added at the front end of the storage rack, so as to realize the walking of the four-way vehicle and the placement of the goods. The above structure is only a preferred embodiment, wherein the material of the storage rack can be iron or aluminum. The above-mentioned support plate can also be other structures, such as channel steel and other structures. The above-mentioned beam frame can be other structures, such as round pipe, channel steel, etc.

The four-way cart of the above stacking system can move in the storage channel to realize the storage or retrieval of goods, and it can also move into the walking channel, so as to realize the mutual transfer of goods on the walking channel and the storage channel. In addition, the four-way vehicle can walk along the walking channel to realize the switching use in different storage channels. In this way, one or more four-way vehicles can be set up on the same shelf as required, so as to meet the needs of cargo handling, and the handling efficiency can be greatly improved due to the short handling distance. In addition, with the stacking car, the stacking car can transfer the goods from the walking channel to the transfer platform, so as to realize the purpose of moving in or out of the goods. There are several advantages in this way. First, the stack car itself relies on wired power supply, while the four-way car relies on batteries. The two are used together, which can greatly improve the use time of the four-way car and maintain its efficient operation; The second is: the vertical development of the stack space can be realized, and the dense stacking can be realized; the third is: each floor is equipped with a four-way car, which can achieve ultra-high efficiency, and the four-way car does not need to be lifted by a lifting mechanism, which can also be achieved. Super high efficiency. In addition, when such efficient operation is not required, less four-way vehicles can be set up, and stacking vehicles can be used to realize the transfer of the upper and lower racks of the four-way vehicles; fourth: even if there are multiple four-way vehicles on the same floor, it is not easy Blocking each other can effectively achieve avoidance. The fifth is: two stacking carts can be set up, which are located on both sides of the stacking track respectively, so as to realize the operation of double stations.

By adopting the foregoing technical scheme, the beneficial effects of the present invention are:

1. Through the setting of such a stacking system, firstly, the problem that the existing stacking system needs to go back and forth can be changed. The biggest disadvantage of the round trip is the long distance, which makes the battery not durable. The existing four-way car can usually be used for 6 hours on a single charge, that is, if it runs at full load, at least four four-way cars are required, and the cost increases at the same time. , will also affect the battery life of the four-way vehicle. Second, it can change the problem of inefficiency of the existing stacking system. The transfer of goods from the stacking channel to the transshipment channel often requires a long distance. This distance wastes both time and electricity, making the overall cargo flow less efficient. . Third, the existing stacking system can be changed. In order to achieve higher efficiency, the existing stacking system often adopts a structure that occupies a wider area and stacks a large number of single-layer shelves. The truck uses a lift in a fixed position to realize the transfer of goods between the shelves, so the efficiency is low, so this structure is used. However, this solution does not have these defects. It can achieve dense and high-level storage. It can use four-way vehicles to transport the goods in the storage channel to the walking channel, place the goods on the walking channel, and then use the stack. The truck takes the goods out of the walking channel and sends them to the transfer platform. At the same time, the four-way vehicle can go to another storage channel again to take out the goods again. Instead, the process for storing goods is similar. In addition, multiple four-way vehicles can be installed on the same shelf, which will not have a blocking problem like the existing stacking system. In this solution, the four-way vehicles on one shelf can quickly shuttle. For each storage channel and walking channel, the storage channel becomes the avoidance area.

2. Due to the dense storage area, these four-way vehicles will also have a maintenance problem, because it is difficult for people to enter and exit in the dense area, and these heavy four-way vehicles cannot be effectively handled. In this solution, the stacker can be used to fork the four-way car, so as to realize the removal and maintenance of the four-way car, but the stability of the fork is weak. It can effectively realize the fixing of the stack car, so as to realize the effective fork and transfer.

3. Through the structural setting of the support plate, its installation performance and stability can be achieved, and the purpose of effective beam frame support can be achieved. The rib plate and the transverse support are fixedly connected with the transverse rod respectively, in order to improve the supporting performance. A bending reinforcing plate is provided on the peripheral part of the rib which is not connected with the transverse bracket and the U-shaped bracket, also to improve the support performance.

4. The beam frame includes a square tube body and a plurality of reinforcing ridges arranged on the inner wall of the square tube, in order to improve the performance of the beam frame itself to carry goods.

5. The two adjacent second walking rails are reinforced and connected by more than two connecting pieces, and at least two connecting pieces are in a crisscross state, which can effectively improve the support purpose and effectively realize the purpose of carrying goods on the walking channel.

On the basis of the above scheme, the stack car has been improved accordingly. The stacking cart 2 includes a walking support for walking on the stacking track 1, a walking driving device 281 arranged on the walking support, a lifting bracket arranged on the walking support, and a lifting seat 23 that can move up and down along the lifting support. A lift drive device 282 for driving the lift base 23 to rise and fall, a telescopic fork arm 24 provided on the lift base 23, and a telescopic fork arm drive device 283 provided on the lift base 23 for driving the telescopic fork arm, the walking support includes a main body part 211. The lateral support portions 212 provided on both sides of the main body portion 211, the two or more pairs of traveling wheels 213 provided on the lower end of the lateral support portion 212, and the guide support portions 214 provided on the lateral support portion 212 and located outside the traveling wheels 213, each The pair of traveling wheels 213 abut against the upper end surface of the stacking track 1 respectively. The outer side of the stacking track 1 is provided with a first sliding rail 11 , and the guiding support portion 214 cooperates with the first sliding rail 11 to realize sliding and clamping. A traveling gear 25 is provided on the output shaft of the traveling drive device, and a traveling rack 12 is provided on the inner side of at least one stacking track 1. The traveling gear 25 meshes with the traveling rack 12 to realize transmission. The lifting bracket includes two The side frame 221 is connected to the horizontal frame 222 arranged on the upper end of the two side frames 221. The side frame 221 is surrounded by three vertical columns 2211, and the adjacent two vertical columns 2211 are connected by a plurality of horizontal columns 2212. In this embodiment, The number of uprights can be set according to actual needs. The three uprights form a triangular support, which is a better stable support.

The lifting seat 23 is respectively provided with a guide wheel mechanism 26 clamped on both sides of the two side frames 221 . A bearing seat 262 on which the wheel seat 261 slides, and a guide wheel 263 rotatably arranged on the bearing seat, the guide wheel seat 261 is provided with a pressing spring 264 for making the bearing seat 262 abut against the upright column 2211, and the structure is as follows: The application of conventional technical means will not be repeated here. Each guide wheel seat 261 is provided with two guide wheels 263 distributed up and down along the upper edge, and the number of the guide wheels can be set according to actual needs. Moreover, the guide wheel mechanism 26 may be provided in multiple numbers, and when the column has multiple adjacent planes, at least two adjacent planes are provided with the guide wheel mechanism 26 . Two vertical columns of each side frame 221 are provided with lifting racks 27. The lifting driving device is a biaxial motor. The two ends of the rotating shaft of the biaxial motor are respectively provided with lifting gears. Strip meshing transmission.

The setting of the stacker truck can realize that only the lower track is set, and the upper sky rail is not needed, which realizes the advantages of convenient installation, cost saving, and no need to have a roof board. It can achieve higher support performance and support strength through the setting of the lifting bracket. The setting of the guide wheel mechanism can effectively achieve the purpose of guiding, preventing deviation and good guiding stability, and can prevent the problem of unstable lifting of the lifting seat because there is no overhead rail, and effectively improve the work efficiency. Effective driving can be achieved by the cooperation of the lifting rack and the biaxial motor.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the present invention has been particularly shown and described in connection with preferred embodiments, it will be understood by those skilled in the art that changes in form and detail may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Various changes are made within the protection scope of the present invention.

Claims (10)

1. A stacking system, characterized by: including the stack track, locate stack car on the stack track, locate the storage frame of stack track both sides, locate stack track one side and be located the transportation platform of storage frame one side, the storage frame includes by supreme a plurality of layers of frame that pile up in proper order down, is equipped with a plurality of storage passageways on each layer frame, and the front end that lies in each storage passageway on each layer frame is equipped with the walking passageway, be equipped with two first walking tracks on the walking passageway, be equipped with two storage tracks in each storage passageway, it is equipped with the second walking track of connecting each storage track to lie in between two first walking tracks on the walking passageway, be equipped with on the walking passageway and be used for coming and going the four-way car of storage track and second walking track, the four-way car can follow first walking track walking, the top that lies in the four-way car on the walking passageway is equipped with the crossbeam frame that is used for placing.

2. A stacking system according to claim 1, wherein: the four-direction vehicle comprises a body, a lifting lock pin and a lifting driving device, wherein the lifting lock pin can be arranged on the body in a vertically lifting mode, the lifting driving device is arranged on the body and used for driving the lifting lock pin, the stack vehicle comprises a body, a fork arm and a telescopic driving device, the fork arm can stretch along the body, the telescopic driving device is arranged on the body and used for driving the fork arm, the distance between every two adjacent transverse beam frames is larger than the width of the four-direction vehicle, and a clamping groove corresponding to the lifting lock pin is formed in the fork arm.

3. A stacking system according to claim 1 or 2, characterised in that: the layer frame includes horizontal pole and montant, be equipped with the backup pad on the montant is located walking passageway's front and back both ends respectively, the backup pad is including the card put the U-shaped support of locking on the montant, locate the horizontal support of U-shaped support side, connect the floor of locating horizontal support and U-shaped support, the crossbeam roof beam frame detachably locates on the floor.

4. A stacking system according to claim 3, wherein: the ribbed plate and the transverse bracket are respectively fixedly connected with the transverse rod.

5. A stacking system according to claim 3, wherein: and bending reinforcing plates are arranged on the peripheral parts of the rib plates, which are not connected with the transverse bracket and the U-shaped bracket.

6. A stacking system according to claim 1 or 2, characterised in that: the cross beam frame comprises a square pipe body and a plurality of reinforcing convex ribs arranged on the inner wall of the square pipe body.

7. A stacking system according to claim 1 or 2, characterised in that: the two adjacent second walking tracks are connected in a reinforcing manner through more than two connecting pieces, and at least two connecting pieces are in a cross state.

8. A stacking system according to claim 1 or 2, characterised in that: the stack vehicle comprises a walking support for realizing walking on the stack track, a walking driving device arranged on the walking support, a lifting support arranged on the walking support, a lifting seat capable of lifting up and down along the lifting support, a lifting driving device for driving the lifting seat to lift, a telescopic fork arm arranged on the lifting seat, and a telescopic fork arm driving device arranged on the lifting seat and used for driving the telescopic fork arm, wherein the walking support comprises a main body part, transverse supporting parts arranged on two sides of the main body part, more than two pairs of walking wheels arranged at the lower end of the transverse supporting parts, and guide supporting parts arranged on the transverse supporting parts and positioned outside the walking wheels, each pair of walking wheels are respectively abutted against the upper end surface of the stack track, a first sliding rail is arranged on the outer side of the stack track, the guide supporting parts are matched with the first sliding rail to realize sliding clamping, and a walking gear is, the inner side of at least one stack rail is provided with a walking rack, the walking gear is meshed with the walking rack to realize transmission, the lifting support comprises two side frames and a transverse frame connected to the upper ends of the two side frames, the side frames are formed by surrounding at least three upright posts, and the two adjacent upright posts are connected through a plurality of transverse posts.

9. A stacking system according to claim 8, wherein: the lifting seat is respectively provided with guide wheel mechanisms clamped on two sides of the two side frames, each guide wheel mechanism comprises a guide wheel seat which is respectively contacted and abutted against two side surfaces of the upright column, a bearing seat which can slide along the guide wheel seat and a guide wheel which is rotatably arranged on the bearing seat, the guide wheel seats are provided with jacking springs for realizing that the bearing seats are jacked and abutted against the upright column, and each guide wheel seat is provided with more than two guide wheels in a vertically distributed manner.

10. A stacking system according to claim 8, wherein: lifting racks are arranged on two of the upright columns of each side frame, the lifting driving device is a double-shaft motor, lifting gears are respectively arranged at two ends of a rotating shaft of the double-shaft motor, and each lifting gear is respectively in meshing transmission with each lifting rack.

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