WO2021109098A1

WO2021109098A1 - Object distributed associative access system and access method

Info

Publication number: WO2021109098A1
Application number: PCT/CN2019/123482
Authority: WO
Inventors: 黄国城
Original assignee: 黄国城
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2021-06-10

Abstract

Provided are an object distributed associative access system and access method, comprising: creating a carrying-implement group, moving said carrying-implement group to an exchange area, an exchange area reading device detecting the number of carrying implements contained in the carrying-implement group and transmitting same to a central control unit, and the central control unit comparing the number of carrying implements with a preset value; if the number of vehicles is less than the preset value, then moving the carrying-implement group in the exchange area to a relay station; if the number of carrying implements satisfies the preset value, then randomly moving the carrying-implement group in the exchange area to an empty storage site; after the empty storage site receives the carrying-implement group from the exchange area, a storage area reading device reading each tag information of each carrying implement of the carrying-implement group and transmitting same to the central control unit, and the central control unit recording each tag information of each carrying-implement group and the storage site where the carrying-implement group is located.

Description

Object distributed associative access system and access method

Technical field

The invention relates to a system and method for collecting and distributing physical objects.

Background technique

Grouping by category is the basic method of traditional distributed management of objects, but the shortcomings are briefly described as follows:

1. The management system has designated and recorded the storage points where the objects are placed in the warehouse by category, but it cannot absolutely avoid the problem of warehouse management personnel storing objects in the wrong storage point. If the warehouse is huge and the movement lines are complicated, once the objects are placed in the wrong position, it will be difficult to find the wrong objects.

2. The storage of items in the warehouse is also allocated space according to categories. When a certain category of items is collected less or withdrawn more, there is a lot of empty storage space in that category, but it cannot be placed for other types of items. Or when a certain category of objects is too much to be collected and the original storage space is insufficient, the objects overflowing the storage position have no suitable place for storage. Obviously, the system and method of categorization lead to the inefficient use of warehouse space.

3. In order to facilitate the collection and retrieval of objects, the surrounding storage location should be reserved for managers or transportation equipment to pass through, which will easily cause confusion in the movement of collection and retrieval of objects and reduce the available warehouse area.

Summary of the invention

In order to solve the above-mentioned problems, the present invention proposes an object distributed associative access system and access method.

The technical feature of the present invention: a distributed associative access system for objects, including:

A central control unit;

At least one storage area, and each storage area has a predetermined number of storage sites, which are recorded by the central control unit; each storage site can be dynamically designated to place a vehicle group; the vehicle group is It is composed of a predetermined number of stacked carriers; the carrier carries a physical object; each carrier includes a readable label presented on the surface of the carrier, the readable label contains a label information, the label The information records the object data in the vehicle;

A storage area recognition device is set in the storage area, and the storage area recognition device reads each tag information of the carrier group of each storage site and transmits it to the central control unit; The central control unit records each tag information of each vehicle group and the storage site where the vehicle group is located;

At least one exchange area, the vehicle group moving from the storage area or to enter the storage area is located in the exchange area; the exchange area is provided with an exchange area reading device, and the exchange area reading device is the exchange area Have a vehicle group, the number of vehicles contained in the vehicle group, and read each tag information of the vehicle group and send it to the central control unit;

At least one relay station receives the vehicles remaining in the exchange area but the number of which cannot constitute a vehicle group; the relay station is equipped with a relay station reading device, which reads the readable tag of each vehicle, and puts the tag Information is sent to the central control unit;

A power transmission device, under the command and control of the central control unit, is responsible for the in/out and movement of the vehicle group in the storage area, the exchange area, and the relay station; in the storage area, the power transmission device controls the load The tool group enters or moves out of an empty storage site designated by the central control unit.

Preferably, the type of the readable label includes a bar code, a two-dimensional code, a three-dimensional code, a color, an image, a text, and a symbol, or a combination of at least two.

Preferably, the composite is overlapped, linear arrangement, or matrix arrangement.

Preferably, the color is the color of the carrier, or the color blocks or shades appearing on the surface of the carrier.

Preferably, the shape is a carrier shape or at least one shape block present on the surface of the carrier.

An object collection method based on the aforementioned access system includes the following steps:

Step 1: The exchange area receives a vehicle group established through an object collection process;

Step 2: The exchange area reading device detects the number of vehicles contained in the vehicle group in the exchange area and transmits it to the central control unit, and the central control unit compares the number of vehicles with a preset value;

Step 3: If the number of vehicles is less than the preset value, the central control unit orders the power transmission device to move the group of vehicles in the exchange area to the relay station; if the number of vehicles meets the preset value, the central control unit The unit orders the power transmission device to transport the vehicle group in the exchange area to an empty storage site designated by the central control unit; if the number of vehicles in the exchange area exceeds the preset value, the central The control unit sends out a warning message that the power delivery device will not operate until the excess vehicle is removed;

Step 4: After the empty storage site receives the carrier group from the exchange area, the storage area recognition device transmits each tag information of the carrier group to the central control unit for recording.

An object retrieval method based on the aforementioned access system includes the following steps:

Step 1: The central control unit searches for each tag information in the storage area according to the object retrieval conditions contained in an object retrieval command;

Step 2: The central control unit points out the storage site of the vehicle group that meets the object retrieval conditions;

Step 3: The central control unit controls the power delivery device to take out the vehicle group from the designated storage site. When the vehicle group leaves the storage site to which it belongs, the tag information of the storage site is cleared ；

Step 4. The central control unit controls the power delivery device to transport the vehicle group taken out from the storage site to the exchange area. The entire vehicle group in the exchange area can be taken out, or only the vehicle group in the exchange area can be taken out. One or more of the vehicles that are subject to the item withdrawal condition;

Step 5: After the object is retrieved, if the unclaimed vehicle remains in the exchange area, the central control unit instructs the power transmission device to move the remaining vehicle to the relay station;

Step 6: The relay station receives the carrier from the exchange area, and the relay station reading device reads each tag information of the carrier and sends it to the central control unit for recording.

A relay station management method based on the aforementioned access system includes the following steps:

Step 1: Randomly select the vehicles in the relay station and stack them into one or more vehicle groups, and the number of vehicles in each vehicle group meets the preset value set by the central control unit;

Step 2: The central control unit instructs the power transmission device to transport the vehicle group of the relay station to the exchange area, the vehicle group leaves the relay station, and the tag information of the vehicle group is cleared from the relay station; the exchange area identification The reading device detects the number of vehicles contained in the vehicle group from the relay station and transmits it to the central control unit, and the central control unit compares the number of vehicles with the preset value;

Step 3: If the number of vehicles is less than the preset value, the central control unit instructs the power transmission device to move the vehicle in the exchange area back to the relay station; if the number of vehicles meets the preset value, it becomes a vehicle The central control unit orders the power transmission device to transport the vehicle group in the exchange area to an empty storage site designated by the central control unit; if the number of vehicles exceeds the preset value, the central control unit The control unit sends out a warning message that the power delivery device will not operate until the excess vehicle is removed;

Step 4: After the empty storage site receives the carrier group moved from the relay station, the storage area identification device transmits each tag information of the storage site to the central control unit for recording.

The effect of the present invention:

In the present invention, the readable label is attached to the carrier instead of being labeled on the object. The subject matter managed by the system and method of the present invention is a vehicle and a vehicle group, and based on the fact that each vehicle constituting the vehicle group has used a readable label to record in detail the information of the object contained in the vehicle, Therefore, the purpose of object management can also be achieved through the management of vehicles and vehicle groups.

The vehicle group is established in the object receiving process, and each vehicle must be attached with a readability label and complete label information before entering the storage area. Under this premise, the warehouse manager (natural person or robot) does not need to know the content of the object when receiving the object, and does not need to classify the object. As long as the predetermined number of vehicles are stacked in a vertical row, the aforementioned vehicle group is formed. That's it, convenient, fast, and labor burden reduced.

In the system and method of the present invention, storage areas and storage sites are not pre-classified, but can dynamically and randomly store vehicle groups. In this way, all storage sites in the storage area can be used. The utilization rate of the storage area is improved, and the central control unit records the location of all the objects in each vehicle in the storage area, and there is no problem of leakage.

The system and method of the present invention ensure that each storage site has only two modes, namely a vehicle group or no vehicle group (empty), and each vehicle group is equipped with a vehicle designated by the central control unit Quantity. Vehicles enter and exit the storage site in a "group" mode, and enter and exit groups in groups, rather than individual vehicles entering and leaving.

Description of the drawings

Figure 1 is a block diagram of the configuration of the system of the present invention.

Figure 2 is a schematic diagram of the vehicle group and the vehicles in the storage area, exchange area, and relay station of the present invention.

Figure 3 is one of the schematic diagrams of the object collection method of the present invention.

4 is the second schematic diagram of the action of the object collection method of the present invention.

Fig. 5 is the third schematic diagram of the action of the object collection method of the present invention.

Fig. 6 is the fourth schematic diagram of the action of the object collection method of the present invention.

FIG. 7 is one of the schematic diagrams of the action of the method for removing an object according to the present invention.

Fig. 8 is the second schematic diagram of the action of the method for removing an object according to the present invention.

Fig. 9 is the third schematic diagram of the action of the method for leading out an object according to the present invention.

Fig. 10 is the fourth schematic diagram of the action of the method for removing an object according to the present invention.

Figure 11 is one of the schematic diagrams of the operation of the relay station management method of the present invention.

Fig. 12 is the second schematic diagram of the action of the relay station management method of the present invention.

FIG. 13 is the third schematic diagram of the operation of the relay station management method of the present invention.

FIG. 14 is the fourth schematic diagram of the operation of the relay station management method of the present invention.

Reference number

10: Central control unit; 20: storage area; 21: storage site; 22: storage area reading equipment; 30: vehicle group; 31: vehicle; 32: readability label; 41: power transmission device ; 50: exchange area; 51: exchange area reading equipment; 60: relay station; 61: relay station reading equipment.

Detailed ways

The object distributed associated access system and access method of the present invention include the processes of receiving objects, removing objects, storing objects, and management of relay stations. As shown in Figure 1 and Figure 2, the descriptions are as follows:

The access system includes a vehicle group 30, a storage area 20, a storage area reading device 22, an exchange area 50, an exchange area reading device 51, a relay station 60 and a relay station reading device 61, and a central control unit 10 and The power transmission device 41 and the central control unit 10 direct, control, order, and manage the operation of the above devices, and manage the information returned by each device. The power transmission device 41 is responsible for the in and out and movement of the carrier group in the storage area 20, the exchange area 50, and the relay station 60. The power conveying device 41 is composed of various automated conveying and handling equipment currently used in the industry.

In the storage area 20, a predetermined number of storage sites 21 are set up, and the storage sites 21 are recorded by the central control unit 10; each storage site 21 is for a vehicle group 30 to place.

The carrier group 30 is composed of a predetermined number of stacked carriers 31; the carriers 31 include, but are not limited to, baskets, pallets, cabinets, boxes, and any structure that can carry objects, but the common condition is that Stack firmly. The object carried in the carrier 31 can be a single object or multiple types of objects. The surface of each carrier 31 includes a readable label 32, and the readable label 32 contains label information, and the label information records the object data in the carrier 31. The readable label 32 can be a barcode, a two-dimensional code, a three-dimensional code, a color, an image, a text, a symbol, etc., or a combination of at least two of these types. The color is the color of the carrier, or the color block or color light present on the surface of the carrier. The shape is the shape of the carrier or at least one shape block present on the surface of the carrier. The composite of this type is overlapping, linear arrangement, or matrix arrangement. The object data includes, but is not limited to, the object number, producer information, object specifications, production time, transfer or delivery time, quantity, unit price, total price, tax, etc.

The storage area recognition device 22 is arranged in the storage area 20 to detect whether each storage site 21 has a vehicle group 30 and read the label information of each readable label 32 of the vehicle group 30 , And send the detected and read results to the central control unit 10 for storage. The central control unit 10 records each tag information of each carrier group 30 and the storage site 21 where the carrier group 30 is located.

The power conveying device 41, the central control unit 10 controls the moving stroke, direction and stop position of the power conveying device 41; the power conveying device 41 is responsible for the in and out of the storage area 20, the exchange area 50, and the relay station 60. . In the storage area 20, the power transmission device 41 controls a vehicle group 30 to enter an empty storage site 21 designated by the central control unit 10, or removes a vehicle group 30 from the storage site to which it belongs Moving out in 21, the power conveying device 41 also transports the carriers and the storage area 20, the exchange area 50, and the relay station 60.

The exchange area 50 serves as a throughput port for receiving and unloading objects. The power transmission device 41 is placed in the exchange area 50 for a carrier group 30 that is removed from the storage area 20 or to be moved into the storage area 20.

The exchange area reading device 51 is arranged in the exchange area 50, and the exchange area reading device 51 whether the exchange area 50 has the vehicle group 30, the number of vehicles 31 contained in the vehicle group 30, and reads the The label information of each readable label 32 of the carrier group 30 is sent to the central control unit 10 so that the central control unit 10 can manage the location of each carrier 31 in detail.

A relay station 60. The power transmission device 41 transfers the carriers 31 remaining in the exchange area 50 that cannot form the carrier group 30 to the relay station 60.

The repeater station recognition device 61 is set in the repeater station 60, reads the readable tags 32 of each carrier 31, and transmits the tag information to the central control unit 10, so that the central control unit 10 can manage each item in detail. The location of a carrier 31 and the number of carriers 31 in the relay station 60 are determined.

The configuration of the storage area reading device 22, the exchange area reading device 51, and the relay station reading device 61 depends on the readability tag 32, so as to achieve the purpose of automatic reading and automatic information processing. For example: The readability label 32 is a one-dimensional code, and the reading device uses a barcode scanner; the readability label is a two-dimensional code, three-dimensional code, images, text, and symbols, and the reading device uses an image sensor (CCD, CMOS). ). The readability label 32 is a color, and the reading device uses a color sensor.

There may be many kinds of management methods and programming designs for the storage area 20 and the storage site 21. The present invention is described with an embodiment, but the implementation method of the present invention is not limited by this example. For example: the storage area 20 is assigned an exclusive code (for example, capital A, B, C...); each storage site 21 is also assigned an exclusive code (for example, Arabic numerals 01, 02, 03, 04...); Therefore, "A01" represents the storage site number 01 in the storage area A, and A09 represents the storage site number 09 in the storage area A; these exclusive codes are recorded in the central control unit 10.

The carrier group 30 is established in the storage device object receiving process. Before each carrier 31 enters the storage device, a readable label 32 must be assigned and complete label information must be created. Under this premise, the warehouse keeper (natural person or robot) in the object collection process does not need to know what the contents of the vehicle is, and does not need to classify the object, as long as the predetermined number (for example, 6) is preset by the central control unit 10 ) The carriers 31 are stacked in a vertical row to form the aforementioned carrier group 30. Each carrier 31 has a readable label 32, and the label information is object data (for example, lowercase letters a, b, c...). Suppose a vehicle group 30 contains six vehicles 31, so there are six tag information of a, b, c, d, e, and f. This vehicle group 30 is placed in the aforementioned position A01, and the storage area reads the equipment 22 reads the centralized storage site 21 and the tag information and transmits it to the central control unit 10, and the central control unit 10 attaches the six tag information to the A01 position and records it. The storage site 21 with tag information in the central control unit 10 represents the vehicle group 30, while the storage site 21 without tag information represents empty.

Please refer to Figures 3 to 6, based on the above-mentioned device and the construction principle of the vehicle group 30, the object collection method of the present invention can be implemented accordingly, including:

Step 1: The exchange area 50 receives a vehicle group 30 established from the aforementioned object receiving process;

Step 2: The exchange area recognition device 51 detects the number of vehicles 31 contained in the vehicle group 30 of the exchange area 50 and transmits them to the central control unit 10, and the central control unit 10 compares the number of vehicles 31 with one Preset value comparison;

Step 3: If the number of vehicles 31 is less than the preset value, the central control unit 10 orders the power transmission device 41 to move the vehicles 31 to the relay station 60 and cannot enter the storage area 20; if the number of vehicles 31 meets the preset value Value, the central control unit 10 instructs the power delivery device 41 to transport the vehicle group 30 in the exchange area 50 to an empty storage site 21 designated by the central control unit 10; if the number of vehicles 31 is more than expected Set the value, the central control unit 10 sends out a warning message, the power transmission device 41 does not operate, waiting for the warehouse keeper (natural person or robot) to remove the excess vehicle 31;

Step 4: After the empty storage site 21 receives the carrier group 30 from the exchange area 50, the storage area recognition device 22 transmits the storage site 21 and tag information to the central control unit 10 for recording.

The system and method of the present invention ensure that each storage site 21 has only two modes, namely a vehicle group 30 or no vehicle group 30 (empty), and each vehicle group 30 is equipped with a central control unit 10 The designated number of vehicles 31, so that the storage sites 21 with the vehicle group 30 are fully loaded with the vehicles 31. The location information and tag information of the central control unit 10 manage exactly what objects are stored in each storage site 21. The central control unit 10 ensures that the objects in each vehicle 31 are recorded in the storage site 21 where it is located, and there is no loss. In the present invention, the storage area 20, the storage site 21, the vehicle group 30, and the vehicle 31 do not need to be classified and arranged.

As shown in Fig. 7 to Fig. 10, based on the above-mentioned system and method, the object retrieval method of the present invention is realized, including:

Step 1: The central control unit 10 searches for each tag information of the storage area 20 according to the object retrieval conditions included in an object retrieval command;

Step 2: The central control unit 10 points out the storage sites 21 of the vehicle group 30 that meet the object retrieval conditions; there may be one or several storage sites 21, because the vehicles 31 that meet the object retrieval conditions Are randomly distributed in the storage area 20;

Step 3: The central control unit 10 controls the power delivery device 41 to take out the vehicle group 30 from the designated storage site 21; when the vehicle group 30 leaves its storage site 21, the tag information of the storage site 21 is automatically Clear; as described in step 2, if several storage sites 21 have vehicles 31 that meet the object retrieval conditions, the power delivery device 41 follows the instructions of the central control unit 10 from the designated storage sites 21 one by one Take out the vehicle group 30;

Step 4: The central control unit 10 controls the power conveying device 41 to convey the vehicle group 30 taken out from the storage site 21 to the exchange area 50, and the warehouse manager (natural person or robot) removes the vehicle from the exchange area 50. The vehicle group 30, or one or more vehicles 31 that meet the object extraction conditions are taken out from the vehicle group 30. In this example, if the warehouse owner is a robot, the central control unit 10 can transmit the readable label 32 data from the object to the robot in advance, and the robot can quickly find and take out the target vehicle according to the readable label 32 data. 31. If the warehouse owner is a natural person, a reader can be used to read the readable tag 32 to confirm the target vehicle 31. Alternatively, the exchange area recognition device 51 directly points out the target vehicle 31 after reading the tag information, so that the warehouse manager can take out the target vehicle 31;

Step 5. After the object is retrieved, if the exchange area 50 leaves the carrier 31 that does not meet the requirements for retrieval of the object and does not take it away, the central control unit 10 instructs the power transmission device 41 to move the remaining carrier 31 To the relay station 60;

Step 6: The relay station 60 receives the remaining vehicles 31 from the exchange area 50, and the relay station reading device 61 whether the relay station 60 has vehicles 31, the number of vehicles 31, and the number of vehicles 31 A tag information is sent to the central control unit 10 so that the central control unit 10 can manage each vehicle 31 in detail and surely.

The object retrieval method of the present invention still adheres to the aforementioned principles. Each storage site 21 has only two modes, namely, a vehicle group 30 or no vehicle group 30 (empty), and each vehicle group 30 has The number of vehicles 31 designated by the central control unit 10 is provided. The vehicle group 30 with less than the number of vehicles 31 is organized in the relay station 60 and is still controlled by the central control unit 10.

As shown in Fig. 11 to Fig. 14, based on the above-mentioned system and method, the relay station management method of the present invention is realized, including:

Step 1: Randomly select the carriers 31 in the relay station 60 and stack them to a predetermined number of the central control unit 10 to form a carrier group 30;

Step 2: Move the vehicle group 30 established by the relay station 60 to the exchange area 50, and the vehicle group 30 leaves the relay station 60, and its tag information is deleted from the relay station 60; the exchange area identification device 51 detects Measuring the number of vehicles 31 included in the vehicle group 30 from the relay station 60 and transmitting them to the central control unit 10, and the central control unit 10 compares the number of vehicles 31 with a preset value;

Step 3: If the number of vehicles 31 is less than the preset value, the central control unit 10 orders the power transmission device 41 to move the vehicles 31 back to the relay station 60 and cannot enter the storage area 20; if the number of vehicles 31 meets the preset value Value, the central control unit 10 instructs the power delivery device 41 to transport the vehicle group 30 in the exchange area 50 to an empty storage site 21 designated by the central control unit 10; if the number of vehicles 31 is more than expected Set the value, the central control unit 10 sends out a warning message, the power transmission device 41 does not operate, and waits for the warehouse keeper to remove the redundant vehicle 31;

Step 4: After the empty storage site 21 receives the vehicle group 30 moved from the relay station 60, the storage area recognition device 22 transmits each tag information of the storage site 21 to the central control unit 10 records it.

The relay station management method of the present invention integrates the scattered vehicles 31 of the relay station 60 into one (or more) complete vehicle group 30, still upholding the purpose of establishing the aforementioned vehicle group 30, and the storage device manager does not need to know in advance The content objects carried by the relay station 60 do not need to be classified at the relay station 60. As long as the predetermined number of carriers 31 are stacked in a vertical row to form the aforementioned carrier group 30, they are transported back to the storage area 20 for storage. .

Claims

A distributed associative access system for objects, which is characterized in that it comprises:

A central control unit;

At least one storage area, and each storage area has a predetermined number of storage sites, which are recorded by the central control unit; each storage site can be dynamically designated to place a vehicle group; the vehicle group is It is composed of a predetermined number of stacked carriers; the carrier carries a physical object; each carrier includes a readable label presented on the surface of the carrier, the readable label contains a label information, the label The information records the object data in the vehicle;

A storage area recognition device is set in the storage area, and the storage area recognition device reads each tag information of the carrier group of each storage site and transmits it to the central control unit; The central control unit records each tag information of each vehicle group and the storage site where the vehicle group is located;

At least one exchange area, the vehicle group moving from the storage area or to enter the storage area is located in the exchange area; the exchange area is provided with an exchange area reading device, and the exchange area reading device is the exchange area Have a vehicle group, the number of vehicles contained in the vehicle group, and read each tag information of the vehicle group and send it to the central control unit;

At least one relay station receives the vehicles remaining in the exchange area but the number of which cannot constitute a vehicle group; the relay station is equipped with a relay station reading device, which reads the readable tag of each vehicle, and puts the tag Information is sent to the central control unit;

A power transmission device, under the command and control of the central control unit, is responsible for the in and out and movement of the vehicle group in the storage area, the exchange area, and the relay station; in the storage area, the power transmission device controls the load The tool group enters or moves out of an empty storage site designated by the central control unit.
The access system according to claim 1, wherein the type of the readable label includes a bar code, a two-dimensional code, a three-dimensional code, a color, an image, a text, and a symbol, or a combination of at least two.
3. The access system of claim 2, wherein the compound is an overlap, a linear arrangement, or a matrix arrangement.
The access system of claim 1, wherein the color is a color of a carrier, or a color block or color light presented on the surface of the carrier.
The access system of claim 1, wherein the shape is a carrier shape or at least one shape block present on the surface of the carrier.
An access method of the access system according to claim 1, characterized in that it comprises:

An object collection method includes the following steps:

Step 1: The exchange area receives a vehicle group established through an object collection process;

Step 2: The exchange area reading device detects the number of vehicles contained in the vehicle group in the exchange area and transmits it to the central control unit, and the central control unit compares the number of vehicles with a preset value;

Step 3: If the number of vehicles is less than the preset value, the central control unit orders the power transmission device to move the group of vehicles in the exchange area to the relay station; if the number of vehicles meets the preset value, the central control unit The unit orders the power transmission device to transport the vehicle group in the exchange area to an empty storage site designated by the central control unit; if the number of vehicles in the exchange area exceeds the preset value, the central The control unit sends out a warning message that the power delivery device will not operate until the excess vehicle is removed;

Step 4: After the empty storage site receives the carrier group from the exchange area, the storage area recognition device transmits each tag information of the carrier group to the central control unit for recording.
An access method of the access system according to claim 6, characterized in that it comprises:

An object retrieval method includes the following steps:

Step 1: The central control unit searches for each tag information in the storage area according to the object retrieval conditions contained in an object retrieval command;

Step 2: The central control unit points out the storage site of the vehicle group that meets the object retrieval conditions;

Step 3: The central control unit controls the power delivery device to take out the vehicle group from the designated storage site. When the vehicle group leaves the storage site to which it belongs, the tag information of the storage site is cleared ；

Step 4. The central control unit controls the power delivery device to transport the vehicle group taken out from the storage site to the exchange area. The entire vehicle group in the exchange area can be taken out, or only the vehicle group in the exchange area can be taken out. One or more of the vehicles that are subject to the item withdrawal condition;

Step 5: After the object is retrieved, if the unclaimed vehicle remains in the exchange area, the central control unit instructs the power transmission device to move the remaining vehicle to the relay station;

Step 6: The relay station receives the carrier from the exchange area, and the relay station reading device reads each tag information of the carrier and sends it to the central control unit for recording.
An access method of the access system according to claim 7, characterized in that it comprises:

A relay station management method includes the following steps:

Step 1: Randomly select the vehicles in the relay station and stack them into one or more vehicle groups, and the number of vehicles in each vehicle group meets the preset value set by the central control unit;

Step 2: The central control unit instructs the power transmission device to transport the vehicle group of the relay station to the exchange area, the vehicle group leaves the relay station, and the tag information of the vehicle group is cleared from the relay station; the exchange area identification The reading device detects the number of vehicles contained in the vehicle group from the relay station and transmits it to the central control unit, and the central control unit compares the number of vehicles with the preset value;

Step 3: If the number of vehicles is less than the preset value, the central control unit instructs the power transmission device to move the vehicle in the exchange area back to the relay station; if the number of vehicles meets the preset value, it becomes a vehicle The central control unit orders the power transmission device to transport the vehicle group in the exchange area to an empty storage site designated by the central control unit; if the number of vehicles exceeds the preset value, the central control unit The control unit sends out a warning message that the power delivery device will not operate until the excess vehicle is removed;

Step 4: After the empty storage site receives the carrier group moved from the relay station, the storage area identification device transmits each tag information of the storage site to the central control unit for recording.