A four-way vehicle in-and-out warehouse device and a method for using the same

Abstract

The application relates to a four-way vehicle warehouse-in and warehouse-out device and a use method thereof, and aims at solving the problems of low warehouse-in and warehouse-out efficiency and high equipment operation cost of a two-way grid-shaped four-way vehicle walking system in an existing warehouse system. The application comprises a transportation rail assembly and a four-way vehicle, the transportation rail assembly comprises two mutually parallel transportation rails, an avoidance rail and a goods warehouse-in and warehouse-out device, the side of the transportation rail is connected with the goods warehouse-in and warehouse-out device, a plurality of goods entrances and exits are formed, a plurality of avoidance rails are connected between the two transportation rails, the four-way vehicle is distributed on the two transportation rails and is used for goods transportation, the four-way vehicle moves in one direction along any one of the transportation rails, the directions of the four-way vehicle along the two transportation rails for goods transportation are opposite, and the four-way vehicle moves along any one of the transportation rails for goods transportation and moves to the other transportation rail along the avoidance rail. The four-way vehicle warehouse-in and warehouse-out device has high goods warehouse-in and warehouse-out efficiency and low production cost.

Description

Technical Field

[0001] This application relates to a four-way vehicle entry and exit device and its usage method, belonging to the field of automated warehousing and logistics technology. Background Technology

[0002] With rising land and labor costs, the concept of high-density warehousing is attracting increasing attention from logistics and e-commerce companies. Automated storage and retrieval systems (AS / RS), due to their high space utilization and strong inbound / outbound capabilities, have become an indispensable warehousing technology for enterprise logistics and production management, with their application in industries such as automotive, chemical, electronics, and tobacco growing year by year. In the coming years, one of the technological development trends of automated storage and retrieval systems will be high speed, high efficiency, and high density.

[0003] To accommodate densely stored palletized goods and increase the amount of goods stored per unit space, four-way shuttle robots, also known as four-way vehicles, are generally used to transfer palletized goods. In existing warehousing operations, the transportation of goods in and out of the warehouse is generally divided into outbound transportation and inbound transportation. The outbound transportation process involves taking goods out of the storage racks and transferring them from the racks to the outbound workstation via a four-way vehicle, completing the outbound process. The inbound transportation process involves goods entering the storage system from the inbound workstation, then being transferred to the storage racks by a four-way vehicle, and finally being stored on the racks by picking equipment. In the operation of existing warehousing systems, due to the different types of goods and the different requirements for inbound and outbound goods, the number of inbound and outbound workstations and storage racks is relatively large in actual production. To improve the efficiency of inbound and outbound goods, existing technologies use a grid-like walking system composed of main and auxiliary walking aisles to realize the four-way vehicle's goods transportation. However, this type of walking system has the following problems:

[0004] The walkways of the grid-like walking system are all bidirectional, meaning that four-way vehicles can travel in both directions along the walkway. This can easily lead to multiple four-way vehicles being located in the same walkway but traveling in different directions, causing traffic congestion.

[0005] To avoid traffic congestion, an automatic obstacle avoidance function for four-way vehicles is implemented, as illustrated by patent number 202211063840.3, entitled "A Dynamic Obstacle Avoidance Method and Device for Four-Way Shuttle Vehicles." However, this increases the cost of the four-way vehicle control system, and the automatic obstacle avoidance function also increases the cargo transportation route, leading to a longer cargo transportation cycle and thus increasing the four-way vehicle's operating cycle, resulting in higher operating costs.

[0006] In a grid-like walking system, there are differences in the volume of goods transported at different workstations. At workstations with high volume of goods transport, there will be queues of four-way vehicles waiting. This not only affects the efficiency of goods entering and leaving the warehouse, but also causes a shortage of four-way vehicles in the system due to waiting, resulting in low operating efficiency of the entire warehousing system.

[0007] Therefore, there is an urgent need for a four-way vehicle entry and exit device to solve the problems of low efficiency and high operating costs of the existing two-way grid-like four-way vehicle travel system used in the warehousing system. Summary of the Invention

[0008] In view of the problems and shortcomings of the existing technology, this application provides a four-way vehicle entry and exit device and its usage method, aiming to solve the above-mentioned technical problems.

[0009] To achieve the above objectives, this application provides the following technical solution: a four-way vehicle entry / exit device, comprising a transport guide rail assembly and several four-way vehicles. The transport guide rail assembly includes two parallel transport guide rails, a clearance guide rail, and a goods entry / exit device. Several goods entry / exit devices are connected to the side of each transport guide rail, forming several goods entry / exit points. Several clearance guide rails are connected between the two transport guide rails. Several four-way vehicles are distributed on the two transport guide rails for goods transfer. The four-way vehicles move unidirectionally along any one of the transport guide rails for goods transport, and the directions of goods transport by the four-way vehicles along the two transport guide rails are opposite. When a four-way vehicle transports goods along any one of the transport guide rails, it moves to the other transport guide rail by moving along the clearance guide rail. By moving along the two transport guide rails and the clearance guide rail, the four-way vehicles form several circular transport lines of different path lengths between the goods entry / exit points for goods entry / exit.

[0010] Specifically, the avoidance guide rail includes two parallel sub-avoidance guide rails; the two ends of the two sub-avoidance guide rails are respectively perpendicular to the two transport guide rails, and the four-way vehicle moves in both directions on the avoidance guide rails; each transport guide rail includes two parallel sub-transport guide rails for the movement of the four-way vehicle.

[0011] Specifically, among the several cargo inlets and outlets formed by the transport guide rail assembly, at least one clearance rail connects any cargo inlet and outlet of any transport guide rail to the cargo inlet and outlet of an adjacent transport guide rail.

[0012] Specifically, the cargo handling device includes a support frame and a cargo conveyor belt; the support frame is set perpendicular to the transport guide rail, and a collision protection block is provided on one side of the support frame located on the transport guide rail; the cargo conveyor belt is rotatably connected to the upper side of the support frame; the cargo is transported by placing it on the cargo conveyor belt; the cargo conveyor belt is divided into a cargo input conveyor belt, a cargo output conveyor belt, or a bidirectional conveyor belt according to the transport direction; the cargo handling device is divided into a cargo input device, a cargo output device, or a bidirectional cargo conveying device according to the type of cargo conveyor belt.

[0013] Specifically, the cargo entry and exit devices connected to the sides of the two transport rails are one or more of the following: cargo input device, cargo output device, and bidirectional cargo conveying device.

[0014] Specifically, the four-way vehicle includes a frame and a cargo transfer belt; the frame is equipped with traveling wheels that travel in two directions and a lifting mechanism, the lifting mechanism being connected to the traveling wheels to drive the traveling wheels to rise and fall radially; a cargo transfer belt is installed on the upper side of the frame; when the four-way vehicle moves to the cargo entrance / exit, it connects with the cargo transport belt of the cargo entry / exit device through the cargo transfer belt to transfer the cargo.

[0015] Specifically, one end of the transport guide rail extends outward along the transport direction to form a maintenance station for a four-way vehicle; several connecting guide rails are spaced apart between the two transport guide rails to form several stopping stations; charging equipment is provided at the stopping stations to form a charging station for the four-way vehicle.

[0016] Specifically, the number of transport guide rail assemblies is at least one; when the number of transport guide rail assemblies is at least two, each transport guide rail assembly constitutes a transport line; the transport lines are arranged parallel to each other, and long-distance connecting rails are installed between the ends of two adjacent transport lines.

[0017] Specifically, the long-distance connecting rail includes two parallel sub-long-distance connecting rails and several avoidance connecting rails; the two sub-long-distance connecting rails are respectively set perpendicular to the two transport rails; the four-way vehicle moves unidirectionally along any one of the sub-long-distance connecting rails for cargo transport, and the four-way vehicle transports cargo in opposite directions along the sub-long-distance connecting rails; the avoidance connecting rail includes two parallel sub-avoidance connecting rails; the two ends of the two sub-avoidance connecting rails are respectively set perpendicular to the two sub-long-distance connecting rails, and the four-way vehicle moves bidirectionally on the sub-avoidance connecting rails.

[0018] This application also provides a method for using a four-way vehicle entry and exit device, specifically including the following steps:

[0019] S1. First, based on the distribution of storage racks and functional areas in the storage area, select an appropriate number of transport rail components and assemble the components of the four-way vehicle entry and exit device.

[0020] S2. Assemble the components according to the number of transport guide rail assemblies in S1; when there is only one transport guide rail assembly, set the two transport guide rails in parallel, and then determine the goods entry and exit points along the transport guide rails according to the inbound and outbound requirements to form inbound and outbound workstations. Next, install a matching number of goods entry and exit devices at the inbound and outbound workstations; select the matching type of goods entry and exit device according to the goods transport volume of each inbound and outbound workstation, that is, select the matching type of goods transport belt; then, according to the goods transport volume of two adjacent inbound and outbound workstations, install a matching number of clearance rails between the two inbound and outbound workstations to form several circular transport lines with different path lengths; finally, install the maintenance workstation, charging workstation, maintenance equipment, and charging equipment to complete the component installation of one transport guide rail assembly.

[0021] S3. Install the components of the individual transport guide rail assembly according to S2; when the number of transport guide rail assemblies is at least two, arrange each transport guide rail assembly parallel to each other according to the distribution of the storage racks and the functional areas of the site, so that the transport guide rail assemblies are set on the side of the storage racks; then connect the two adjacent transport guide rail assemblies by installing long-distance connecting rails, so that the two adjacent transport guide rail assemblies form a connected transport line; finally, according to the cargo transport volume between the two adjacent transport guide rail assemblies, install an appropriate number of avoidance connecting rails on the long-distance connecting rails to form several circular transport lines with different path lengths between the two adjacent transport guide rail assemblies;

[0022] S4. After completing the component installation of the transport rail assembly in S2 or S3, select a suitable number of four-way vehicles and place them on the transport rail according to the requirements for goods entering and leaving the warehouse and the volume of goods transported; thus completing the component installation process of the four-way vehicle entry and exit device.

[0023] S5. When the four-way vehicle entry / exit device is in use, goods are placed on the cargo conveyor belt of the device by equipment or manual means at the cargo entrance / exit to allow the goods to enter the four-way vehicle entry / exit device; or goods are removed from the cargo conveyor belt by equipment or manual means to allow the goods to leave the four-way vehicle entry / exit device; the four-way vehicle transports goods along the cargo conveyor line, and selects the shortest circular transport line during transport; during cargo transport, the four-way vehicle automatically moves to the charging station or maintenance station for charging or maintenance according to the driving power or maintenance requirements.

[0024] Compared with the prior art, the beneficial effects of this application are as follows:

[0025] The four-way vehicle entry / exit device of this application uses two parallel transport rails, with cargo entry / exit devices installed on the sides of the rails to form cargo entrances and exits. A clearance rail is installed between the two transport rails. The four-way vehicle transports goods along either transport rail and moves to the other transport rail via the clearance rail, thus creating several circular transport lines of different path lengths between the cargo entrances and exits. In this four-way vehicle entry / exit device, the four-way vehicle travels unidirectionally along the transport rails, avoiding congestion on the same aisle and improving cargo entry / exit efficiency.

[0026] Based on the foregoing, and considering the different cargo transport volumes at different cargo entrances and exits, different types of cargo entry and exit devices are installed at cargo entrances and exits with different cargo transport volumes. Furthermore, a number of appropriate clearance guide rails are installed between cargo entrances and exits with different cargo transport volumes to form circular transport lines of different path lengths. This avoids queuing of vehicles in all four directions, thereby improving the efficiency of cargo entry and exit while optimizing the travel path of vehicles in all four directions and reducing their operating cycle.

[0027] Building upon the foregoing, and considering the transportation of goods between varying quantities of warehouse racks, this application employs at least one transport guide rail assembly. These assemblies are arranged in parallel and connected by long-distance connecting rails, thus linking multiple transport guide rail assemblies to form a circular transport line. The long-distance connecting rails in this application are structurally similar to the transport guide rails, allowing four-way vehicles to transport goods in one direction along them. To improve the operating efficiency of the four-way vehicles, avoidance connecting rails are installed between the long-distance connecting rails, enabling the formation of circular transport lines with different path lengths between two transport guide rail assemblies, thereby improving the efficiency of goods entering and leaving the warehouse.

[0028] Building upon the aforementioned considerations, and taking into account the varying distribution of storage racks in automated warehousing systems, the transport lines are arranged parallel to each other, with long-distance connecting rails installed between the ends of adjacent transport lines. This creates U-shaped, S-shaped, or combined connecting transport lines between multiple transport lines. This achieves a circular transport line between storage racks in different locations, improving cargo transport efficiency, optimizing transport line paths, and reducing production costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the four-way vehicle entry and exit device in Embodiment 1.

[0030] Figure 2 This is a schematic diagram of the four-way vehicle entry and exit device in Embodiment 2.

[0031] Figure 3 This is a schematic diagram of the four-way vehicle entry and exit device in Embodiment 2.

[0032] In the diagram: 1. Four-way vehicle; 2. Transport rail; 3. Clearance rail; 4. Cargo input device; 5. Cargo output device; 6. Two-way cargo conveying device; 7. Maintenance station; 8. Charging station; 9. Sub-long distance connecting rail; 10. Clearance connecting rail; 11. Storage rack; 12. Functional area. Detailed Implementation

[0033] The present application will be further described below with reference to the accompanying drawings in the embodiments thereof. Example

[0034] Please see Figure 1 This embodiment discloses a four-way vehicle entry and exit device, including a transport guide rail assembly and several four-way vehicles 1. The transport guide rail assembly includes two parallel transport guide rails 2, a clearance guide rail 3, and a goods entry and exit device. Several goods entry and exit devices are connected to the side of each transport guide rail 2, forming several goods entry and exit points. Several clearance guide rails 3 are connected between the two transport guide rails 2. Several four-way vehicles 1 are distributed on the two transport guide rails 2 for goods transportation. The four-way vehicles move unidirectionally along any one of the transport guide rails, and the directions of goods transportation by the four-way vehicles along the two transport guide rails are opposite. When the four-way vehicles are transporting goods along any one of the transport guide rails, they move to the other transport guide rail by moving along the clearance guide rail. By moving along the two transport guide rails and the clearance guide rail, the four-way vehicles form several circular transport lines of different path lengths between the goods entry and exit points for goods entry and exit.

[0035] Furthermore, the obstacle avoidance rail includes two parallel sub-obstacle guide rails; the two ends of the two sub-obstacle guide rails are respectively perpendicular to the two transport guide rails, and the four-way vehicle moves in both directions on the obstacle avoidance guide rails; each transport guide rail includes two parallel sub-transport guide rails for the movement of the four-way vehicle.

[0036] Furthermore, among the several cargo inlets and outlets formed by the transport guide rail assembly, at least one clearance rail connects any cargo inlet and outlet of any transport guide rail to the cargo inlet and outlet of an adjacent transport guide rail.

[0037] Furthermore, the cargo handling device includes a support frame and a cargo conveyor belt; the support frame is perpendicular to the transport guide rail, and a collision protection block is provided on one side of the support frame located on the transport guide rail; the cargo conveyor belt is rotatably connected to the upper side of the support frame; the cargo is transported by placing it on the cargo conveyor belt; the cargo conveyor belt is divided into a cargo input conveyor belt, a cargo output conveyor belt, or a bidirectional conveyor belt according to the transport direction; the cargo handling device is divided into a cargo input device 4, a cargo output device 5, or a bidirectional cargo conveyor device 6 according to the type of cargo conveyor belt.

[0038] Furthermore, the cargo entry / exit devices connected to the sides of the two transport rails are one or more of the following: cargo input device, cargo output device, and bidirectional cargo conveying device.

[0039] Furthermore, the four-way vehicle 1 includes a frame and a cargo transfer belt; the frame is equipped with traveling wheels that travel in two directions and a lifting mechanism, the lifting mechanism being connected to the traveling wheels for driving the traveling wheels to rise and fall radially; a cargo transfer belt is installed on the upper side of the frame; when the four-way vehicle moves to the cargo entrance / exit, it connects with the cargo transport belt of the cargo entry / exit device through the cargo transfer belt to transfer the cargo.

[0040] Furthermore, one end of the transport guide rail 2 extends outward along the transport direction to form a maintenance station 7 for a four-way vehicle; several connecting guide rails are spaced apart between the two transport guide rails to form several stopping stations; charging equipment is provided on the stopping stations to form a charging station 8 for the four-way vehicle.

[0041] Furthermore, the number of transport rail assemblies is one.

[0042] Example 2: Please refer to Figures 2-3 The difference between Example 2 and Example 1 is that the number of transport rail assemblies is at least two.

[0043] Furthermore, the number of transport guide rail assemblies is at least two, and each transport guide rail assembly constitutes a transport line; the transport lines are arranged parallel to each other, and a long-distance connecting rail is installed between the ends of two adjacent transport lines. In this embodiment, the number of transport guide rail assemblies is at least two. For clarity, each pair of adjacent transport guide rail assemblies constitutes a transport unit, such as... Figure 2 In this configuration, two transport lines are arranged parallel and symmetrically, and their ends are connected by long-distance connecting rails to form a U-shaped transport line. For example... Figure 3 In summary, the two transport lines are parallel and staggered, connected at their ends by long-distance connecting rails to form an S-shaped transport line. When the warehouse racks are located in different positions, transport rails can be laid using U-shaped or S-shaped transport lines, or a combination of both, to connect the warehouse racks in different locations.

[0044] Furthermore, the long-distance connecting rail includes two parallel sub-long-distance connecting rails 9 and several avoidance connecting rails 10; the two sub-long-distance connecting rails are respectively set perpendicular to the two transport rails; the four-way vehicle moves unidirectionally along any one of the sub-long-distance connecting rails for cargo transport, and the four-way vehicle transports cargo in opposite directions along the sub-long-distance connecting rails; the avoidance connecting rail includes two parallel sub-avoidance connecting rails; the two ends of the two sub-avoidance connecting rails are respectively set perpendicular to the two sub-long-distance connecting rails, and the four-way vehicle moves bidirectionally on the sub-avoidance connecting rails.

[0045] The four-way vehicle entry and exit device of this embodiment includes the following steps when in use:

[0046] S1. First, based on the distribution of storage racks 11 and functional areas 12 in the storage area, select an appropriate number of transport rail components and assemble the components of the four-way vehicle entry and exit device.

[0047] S2. Assemble the components according to the number of transport guide rail assemblies in S1; when there is only one transport guide rail assembly, set the two transport guide rails in parallel, and then determine the goods entry and exit points along the transport guide rails according to the inbound and outbound requirements to form inbound and outbound workstations. Next, install a matching number of goods entry and exit devices at the inbound and outbound workstations; select the matching type of goods entry and exit device according to the goods transport volume of each inbound and outbound workstation, that is, select the matching type of goods transport belt; then, according to the goods transport volume of two adjacent inbound and outbound workstations, install a matching number of clearance rails between the two inbound and outbound workstations to form several circular transport lines with different path lengths; finally, install the maintenance workstation, charging workstation, maintenance equipment, and charging equipment to complete the component installation of one transport guide rail assembly.

[0048] S3. Install the components of the individual transport guide rail assembly according to S2; when the number of transport guide rail assemblies is at least two, arrange each transport guide rail assembly parallel to each other according to the distribution of the storage racks and the functional areas of the site, so that the transport guide rail assemblies are set on the side of the storage racks; then connect the two adjacent transport guide rail assemblies by installing long-distance connecting rails, so that the two adjacent transport guide rail assemblies form a connected transport line; finally, according to the cargo transport volume between the two adjacent transport guide rail assemblies, install an appropriate number of avoidance connecting rails on the long-distance connecting rails to form several circular transport lines with different path lengths between the two adjacent transport guide rail assemblies;

[0049] S4. After completing the component installation of the transport rail assembly in S2 or S3, select a suitable number of four-way vehicles and place them on the transport rail according to the requirements for goods entering and leaving the warehouse and the volume of goods transported; thus completing the component installation process of the four-way vehicle entry and exit device.

[0050] S5. When the four-way vehicle entry / exit device is in use, goods are placed on the cargo conveyor belt of the device by equipment or manual means at the cargo entrance / exit to allow the goods to enter the four-way vehicle entry / exit device; or goods are removed from the cargo conveyor belt by equipment or manual means to allow the goods to leave the four-way vehicle entry / exit device; the four-way vehicle transports goods along the cargo conveyor line, and selects the shortest circular transport line during transport; during cargo transport, the four-way vehicle automatically moves to the charging station or maintenance station for charging or maintenance according to the driving power or maintenance requirements.

[0051] Working Principle: In this embodiment, the four-way vehicle inbound / outbound device operates by moving along the transport rails to the designated inbound / outbound location based on the order requirements. The four-way vehicle's conveyor belt connects with the transport belt of the inbound / outbound device, and the goods are then transferred to the four-way vehicle via the transport belt, completing the retrieval process. The four-way vehicle then continues moving along the transport rails towards the unloading station's inbound / outbound location. As configured, the four-way vehicle moves along the shortest transport path, either by avoiding guide rails or by using a long-distance connecting rail. Upon reaching the unloading station's inbound / outbound location, the four-way vehicle's goods are connected to the transport belt of the inbound / outbound device, and finally, the goods are transferred to the inbound / outbound device, completing the inbound / outbound process. This embodiment of the four-way vehicle does not block the aisle during movement, avoids queuing, operates stably, and has high production efficiency.

[0052] The embodiments of this application have been described in detail above. However, this application is not limited to the above embodiments. For those skilled in the art, after learning the contents recorded in this application, several equivalent changes and substitutions can be made without departing from the principle of this application. These equivalent changes and substitutions should also be considered to fall within the protection scope of this application.

Claims

1. A four-way vehicle warehouse access device comprising a transport rail assembly and a plurality of four-way vehicles, characterized in that: The transport rail assembly comprises two parallel transport rails, an avoidance rail and a goods access device; each transport rail is connected with several goods access devices on the side, forming several goods access ports; several avoidance rails are connected between the two transport rails; several four-way vehicles are distributed on the two transport rails for goods transportation; the four-way vehicles move unidirectionally along any transport rail, and the directions of the four-way vehicles along the two transport rails are opposite; when the four-way vehicles transport goods along any transport rail, they move to another transport rail along the avoidance rail; the four-way vehicles move along the two transport rails and the avoidance rail to form several annular transport lines with different path lengths between the goods access ports for the entry and exit of goods. The avoidance rail comprises two parallel sub-avoidance rails; the two ends of the two sub-avoidance rails are perpendicularly arranged with the two transport rails, and the four-way vehicles move bidirectionally on the avoidance rail; each transport rail comprises two parallel sub-transport rails for the movement of the four-way vehicles. Among the several goods access ports formed by the transport rail assembly, at least one avoidance rail is connected between any goods access port of any transport rail and the goods access port of another adjacent transport rail. The goods access device comprises a support and a goods transport belt; the support is perpendicularly arranged with the transport rail, and the support is provided with a bumper on the side of the transport rail; the upper side of the support is parallelly rotatably connected with the goods transport belt; goods are transported by being placed on the goods transport belt; the goods transport belt is divided into a goods input transport belt or a goods output transport belt or a bidirectional transport belt according to the transport direction; the goods access device is divided into a goods input device or a goods output device or a bidirectional goods transport device according to the type of the goods transport belt.

2. The four-way vehicle access and storage device of claim 1, wherein: The goods access devices connected on the sides of the two transport rails are one or more of a goods input device, a goods output device and a bidirectional goods transport device.

3. The four-way vehicle access and storage device of claim 1, wherein: The four-way vehicle comprises a vehicle frame and a goods transfer belt; the vehicle frame is provided with walking wheels walking in two directions and a lifting mechanism connected with the walking wheels for driving the walking wheels to lift in the radial direction; the upper side of the vehicle frame is mounted with the goods transfer belt; when the four-way vehicle moves to a goods access port, the goods transfer belt is docked with the goods transport belt of the goods access device for the transfer of goods.

4. The four-way vehicle access and storage device of claim 1, wherein: The side end of the transport rail extends outward along the transport direction, forming a maintenance station of the four-way vehicle; several connecting rails are arranged between the two transport rails, forming several stop stations; the stop stations are provided with charging equipment, forming a charging station of the four-way vehicle.

5. The four-way vehicle access and storage device of claim 1, wherein: The number of the transport rail assemblies is at least one; when the number of the transport rail assemblies is at least two, each transport rail assembly forms a transport line; the transport lines are arranged parallel to each other, and long-distance connecting rails are installed between the end portions of the adjacent two transport lines.

6. The four-way vehicle access and storage device of claim 5, wherein: The long-distance connecting guide rail comprises two mutually parallel sub long-distance connecting guide rails and a plurality of avoidance connecting guide rails; the two sub long-distance connecting guide rails are arranged perpendicularly to the two conveying guide rails; the four-way vehicle moves unidirectionally along any one of the sub long-distance connecting guide rails for conveying goods, and the directions of the four-way vehicle conveying goods along the sub long-distance connecting guide rails are opposite; the avoidance connecting guide rail comprises two parallel sub avoidance connecting guide rails; the two ends of the two sub avoidance connecting guide rails are arranged perpendicularly to the two sub long-distance connecting guide rails, and the four-way vehicle moves bidirectionally on the sub avoidance connecting guide rail.

7. A method of using a four-way vehicle access device as claimed in any one of claims 1 to 6, characterised in that: The method comprises the following steps: S1. Firstly, according to the distribution of the storage racks in the storage site and the distribution of the functional areas in the site, a suitable number of conveying guide rail assemblies are selected for the component assembly of the four-way vehicle warehouse-in / out device; S2. The component assembly is performed according to the number of the conveying guide rail assemblies in S1; when the number of the conveying guide rail assemblies is one, two conveying guide rails are arranged in parallel, and then according to the warehouse-in / out requirement, the goods warehouse-in / out port is determined along the conveying guide rail to form a warehouse-in / out station, and then a suitable number of goods warehouse-in / out devices are installed at the warehouse-in / out station; according to the goods conveying capacity of each warehouse-in / out station, a suitable number of avoidance guide rails are installed between the two warehouse-in / out stations to form a plurality of annular conveying lines with different path lengths; finally, a maintenance station, a charging station, maintenance equipment and charging equipment are installed to complete the component installation of one conveying guide rail assembly; S3. According to the component installation of the single conveying guide rail assembly in S2; when the number of the conveying guide rail assemblies is at least two, according to the distribution of the storage racks and the distribution of the functional areas in the site, each conveying guide rail assembly is arranged in parallel to each other so that the conveying guide rail assemblies are arranged on the side of the storage racks; then the long-distance connecting guide rail is installed between the adjacent two conveying guide rail assemblies to connect them so that the adjacent two conveying guide rail assemblies form a connected conveying line; finally, according to the goods conveying capacity between the adjacent two conveying guide rail assemblies, a suitable number of avoidance connecting guide rails are installed on the long-distance connecting guide rail to form a plurality of annular conveying lines with different path lengths between the adjacent two conveying guide rail assemblies; S4. After completing the component installation of the conveying guide rail assembly in S2 or S3, a suitable number of four-way vehicles are selected and placed on the conveying guide rail according to the goods warehouse-in / out requirement and the goods conveying capacity; that is, the component installation process of the four-way vehicle warehouse-in / out device is completed. S5. In use, the goods are placed on the goods conveying belt of the goods in-out device by equipment or manually at the goods in-out port, so that the goods enter the four-way vehicle in-out warehouse device; or the goods are taken off from the goods conveying belt by equipment or manually, so that the goods leave the four-way vehicle in-out warehouse device; the four-way vehicle transports the goods along the goods conveying line, and in the transportation, the annular conveying line with the shortest path length is selected for the goods transportation; in the four-way vehicle goods transportation, the four-way vehicle is automatically moved to the charging station or the maintenance station for charging or maintenance according to the driving electric quantity or the maintenance requirement.

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