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Research on Location Allocation Strategies for Multi dimensional Warehouses
Due to the fact that tobacco storage cabinets currently do not adopt the storage method of a full box, rack free, and three-dimensional warehouse, and some of the storage strategies of this storage system are still based on a rack based storage system, this will inevitably affect the efficiency of the entire warehouse's inbound and outbound operations and the utilization of storage space
Non shelving warehouses, storage allocation, and optimized tobacco box storage are widely used in cigarette production. From the traditional manual tobacco box storage method to the emergence of automated storage cabinets in the 1980s, storage cabinets have always played a very important role in cigarette production.
At present, the full box shelf-free three-dimensional warehouse constructed by Xiamen Cigarette Factory is a warehouse that adopts new storage technology. The way in which the containers in this warehouse exit the warehouse is significantly different from traditional shelved warehouses, but this type of warehouse basically follows the storage space allocation strategy of shelved warehouses, resulting in low efficiency and utilization of storage space. Therefore, there is an urgent need for a dedicated storage space allocation strategy for non shelved three-dimensional warehouses. Starting from the current problems encountered, this article discusses the allocation strategy of storage space in shelf-free three-dimensional warehouses and proposes optimization solutions.
The defect in the allocation of storage locations in the old version (1) is that the old version of the inventory principle did not allocate storage locations according to the plan.
Parameters such as material, version, batch, etc. are passed on to people. First, find the incomplete rows. If there are no incomplete rows, find all empty rows, and sort the people in the database according to the row number in descending order. The real box human inventory algorithm is based on the principle of shortening the total time of batch tasks and improving the efficiency of the cart. Although this principle can place multiple empty rows simultaneously in single or multiple tasks, this method sacrifices available storage resources to improve logistics efficiency. In multitasking, the situation of wasting idle storage space is particularly evident.
Empty box storage: According to the type of cigarette box, if the previous person has the same type of cigarette box but it is not full, all people will be empty, and the storage will be arranged according to the line number from small to large. The empty container human storage algorithm aims to shorten the total task time and improve the efficiency of the vehicle, achieving a multi-threaded effect. However, there may be too many rows and storage positions that are not fully filled. This principle has great advantages in large-scale empty container human library tasks, as multi-threaded human libraries are fast. It is suitable for initial empty container initialization of human libraries, but it does not meet the requirement of using fewer storage locations for empty container placement.
Tail box storage: Based on parameters such as material, version, batch, etc., first find the unfilled rows. If there are no unfilled rows, find all empty rows, and sort the inventory by row number from large to small. The human database algorithm is based on the principle of shortening the total time of batch tasks and improving the efficiency of the vehicle. This principle can place multiple empty rows simultaneously in single or multiple tasks, but this method sacrifices available storage resources to improve logistics efficiency. In multitasking, the situation of wasting idle storage space is particularly evident. The tail boxes of each batch of materials occupy a separate row of storage space, which seriously wastes resources.
Standard box outbound: Based on parameters such as material, version, batch, etc., first issue rows that are not yet full. If there are no rows that are not yet full, issue rows that are fully full, and outbound according to row numbers in descending order. The outbound algorithm is based on the principle of shortening the total task time and improving the efficiency of the cart. In a single task, multiple rows are simultaneously outbound to achieve the effect of multithreading. However, there may be too many rows with leftover materials that are not used up. Moreover, in a multi task situation, when there are carts at the packaging, blending, and packaging platforms, each batch of tobacco is packed according to the system plan. Due to the fluctuation of the packing weight, there is a small amount of tobacco remaining later, which cannot reach the planned single box weight. These tobacco boxes are called tail boxes after being packed.
In the case of task execution, its efficiency is no different from the new version's outbound principle, and the utilization rate of storage locations is not as good as the new version.
Empty box outbound: According to the type of cigarette box, first issue rows that are not full. If there are no rows that are not full, issue rows that are fully full, and outbound according to the row number in descending order. The outbound algorithm is based on the principle of shortening the total task time and improving the efficiency of the car. When multiple rows are simultaneously outbound for a single task, it achieves a multi-threaded effect. However, there may be too many rows with remaining empty boxes that are not used up, resulting in a reduction in idle storage space. In addition, some cigarette boxes may not be utilized during long-term use, leading to the production of odor in sealed cigarette boxes. If the flavored tobacco is stored again, it will affect the accuracy of the spices.
Due to the lack of judgment statements in the WCS system, when the AGV car reaches the allocated location line, all the locations in that line have been stored and can only be reassigned to another location line, which affects logistics efficiency.
Dividing the human pool according to the designated area is not conducive to AGV task execution and affects the efficiency of the human pool.
In practical application, the optimization strategy of Xiamen Cigarette Factory has changed the principle of leaving the warehouse for real and empty boxes from WCS scheduling strategy and storage process manpower, so that the allocation of goods follows the principle of proximity, and the cigarette boxes are prioritized according to the designated area to solve the problem of excessive use of storage locations and improve the utilization rate of storage locations. The specific plan is as follows: (1) The new version of the inventory principle is to allocate storage locations according to the plan.
Standard box storage: Lock the required storage locations in advance according to the planned information, and allocate storage locations based on the calculation method of minimizing the difference between the allocated storage locations and the actual storage locations when the storage conditions permit. This principle of human storage can greatly reduce the waste of idle storage locations.
Assuming that the number of standard container personnel is the standard container personnel, the algorithm process is as follows: allocation can be made with empty lines in the available positions. If not, allocation will be made in descending order of 16, 12, and 8. After finding the row, use Q1 to indicate the allocated number of storage positions and Q2 to indicate the unassigned quantity; Q=Q1+Q2， Repeat the above steps with Q2 until the allocation is completed; Zone 2 and 8 storage locations are prioritized for storing surplus (less than or equal to Q2), and priority is given to outbound. If they cannot be found, empty row searches are performed in the order of 12, 16, and 20 storage locations. And manually track and verify whether the standard locked storage locations issued by the plan are reasonable. The standard box storage algorithm is based on the principle of ensuring the efficiency of AGV vehicles while improving the utilization of storage locations. It can complete human storage tasks at a faster speed in both single and multi task tasks, and can cross multiple pedestrian warehouses in locked rows during single tasks to avoid vehicle congestion. This makes reasonable use of idle storage locations and ensures logistics efficiency without causing storage resource waste.
Empty box storage: According to the type of cigarette box, if the previous person has not filled the same type of cigarette box, if there are no rows that are not full, all rows will be empty, and the person storage will be arranged according to the available storage quantity in order of quantity. Each row will be filled one by one, and empty boxes in the same type of cigarette box can be manually interfered with and processed. The empty container human inventory algorithm still adheres to the principle of ensuring the utilization of storage locations. When there are no tasks such as packing, blending, and flipping in a single task, the AGV car may occasionally experience waiting, but it does not affect logistics efficiency; In multitasking, when the packaging platform, packing platform, and blending platform are running simultaneously, the single row pedestrian storage mode can still effectively utilize idle storage space while maintaining the smoothness of AGV cars (see).
Material tail box storage: Based on the characteristics of the existence of material tail boxes (with a small number of boxes), the new version of the algorithm directly matches 8 warehouse locations for material tail box packaging; When a special situation occurs where all 8 storage rows are occupied, allocate 12 storage rows for packing, and search for the number of records in the location (considering aging time) by batch, material, and version according to such authority | A=r've, FindCount is the same batch, same material, and same ※ or different versions. It is modified from multiple rows for simultaneous outbound to single row outbound, and priority is given to the rows with fewer storage boxes. The outbound rows are assigned and returned to the end of the row number until this row is completed. The standard box outbound algorithm process is pushed back. This human resource algorithm aims to improve the utilization rate of storage locations, and can quickly complete the allocation of storage locations and human resource tasks in both single task and multi task work, greatly improving the utilization rate of storage locations. At the same time, in single task work, multiple rows can be crossed in locked rows to avoid vehicle blockage, and idle storage locations can be reasonably utilized, ensuring logistics efficiency and not wasting storage resources. The finished tobacco material tail box is placed in the same brand and batch standard box row, while the blended materials and burley tobacco material tail boxes are placed in the same brand row in 8 storage locations.
Version, batch, and other pass on parameters are shipped out in order of available storage capacity (with priority given to rows with fewer storage boxes), and shipped out line by line until the planned task is completed.
If there is no transfer batch number, the earlier batch of materials will be selected based on the version. The outbound algorithm operates on a single line until it is completed, and multiple lines cannot be outbound simultaneously. However, in practical use, the single line outbound principle is more applicable to the tobacco storage of Xiamen Cigarette Factory. Firstly, the speed of flipping the finished tobacco boxes is about 20 minutes per train, with 2 boxes per train. When multiple platforms request it at the same time, there will be a time difference of 2-5 minutes, which will not cause AGV cars to block during single line outbound. Secondly, when blending semi-finished products, it is about 1 minute per train, with 2 boxes per train. The blending platform will not request the same material at the same time, so the logistics efficiency will not be affected. It can clear a row at a faster speed and free up empty storage space (see 5. Empty box outbound: Based on the type of tobacco box, according to the principle of first in, first out, the average person warehouse time for travel is calculated by taking the number of stored tobacco boxes in each row and the number of stored tobacco boxes in each row. Retrieve rows from the database with earlier time and lock them until this behavior is prioritized. This outbound algorithm, while ensuring logistics efficiency, follows the principle of first in, first out and prioritizes the completion of this line. It can achieve a fast warehouse location recovery speed H and ensure that each empty box can be recycled to prevent mold growth caused by prolonged idle time (see)., The judgment statement is provided and fed back to the human database and outbound storage process.
1. Inventory: The current number of task boxes to be generated assigned to this row plus the number of task boxes already generated and assigned to this row by WCS is higher than the available empty storage space outside. Otherwise, this row will be excluded and restarted. If there is no marked row, search for a new available row tobacco warehouse area map. BYD, Matek, Fengling Logistics Equipment, Toyota Forklift, Hester, Hongdi Logistics, Red Grassland Vision 1, from Funa Ship, Germany, Koojie, Kangkun, B Forest, Manhattan, United States, Bona, Motorola, Omron, Putian Logistics, Volvo, Siemens, Xinsong Company.
Logistics Technology and Applications 2012 New Distribution Line.
2. Outbound: The current available number of stored boxes is equal to the number of task boxes generated and assigned to this row by WCS, plus the number of task boxes to be generated and assigned to this row. Otherwise, this row will be excluded and the row will be reassigned.
（3） The allocation of storage space follows the principle of proximity.
According to the line number, such as 101201301401501, the first digit of the string is truncated as the region, which is 1, 2, 3, 4, and 5 regions. When AGV picks up the goods, it searches for a location closer to the calling platform based on the area. The location of the tobacco warehouse is shown in.
The solid box warehouse is arranged in reverse order, with priority given to 5 areas; When the actual box is shipped out, priority is given to finding a location close to the calling station based on batch number, version, material, and other information.
When empty containers are stored in the warehouse, priority should be given to Zone 2, while when empty containers are released, they should be released based on the principle of first in, first out. Empty containers in Zone 2 cannot be directly released first because the principle of proximity conflicts with the principle of first in, first out. Choosing the principle of proximity cannot achieve the principle of first in, first out.
The steps are as follows.
Divide the area into rows through the front-end interface, and adjust the number of rows in the area; Set the tobacco brand for storage in this area; When in the human warehouse, the available storage locations and packing plans in the designated area will be matched, and priority will be given to storing in the designated area; When there is no available storage space in the designated area, it should be stored according to the normal human warehouse process.
The new location allocation strategy has the following characteristics: structurally, it changes the principle of leaving the warehouse for both real and empty containers, and modifies the WCS scheduling strategy and storage process by modifying the source code. In terms of function: allocate storage spaces according to the plan, ensuring the utilization rate of storage spaces and the efficiency of cigarette box storage.
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