## 2 Description of Mine Material Scheduling Problem  
Coal mine material inventory management is generally divided into three levels, the first level of inventory for the coal mine group, the group according to the production plan to the supply section distribution of materials, the second level of inventory for the mining area supply section, the supply section according to the production plan to the mining area distribution of materials, the supply section distribution of materials stored in the mining area industrial square, the third level of inventory for the mining area, the mining area according to the production plan to the working face distribution of materials, this is the planned distribution. The planned distribution of materials can meet the production needs of most working faces. It is often difficult to take into account the materials needed for special working conditions. The mining captain's working face must propose material requirements such as demand distribution. The material delivery process is shown in Figure 1. Working face to fill in the required material information submitted to take the mining captain for approval. Approval by the demand can be directly collated, approval does not pass the need to fill out the reasons for rejection. The working face checked the reasons for rejection and modified the material application form. After the modification was completed, the material application form was submitted to the mining captain for approval. Take the mining captain to audit all requirements after the formation of the task list and signed. The mining captain confirms whether the materials of the industrial square meet the requirements of the task list. When the materials in the industrial square meet the requirements of the task list, the distribution plan is formulated, and the working face waits for the delivery. The square personnel loads the materials into the standard container according to the Ex-warehouse order. After the loading is completed, the transport team transports according to the working schedule. When the material in the industrial square does not meet the requirements of the task list, the mining captain sends a material shortage notice to the working face, and the working face accepts the material shortage notice and modifies the application. The material loading takes the intelligent loading vehicle of the industrial square as the starting point. The equipment layout of the industrial square is shown in Figure 2. In order to facilitate the loading and unloading of materials and standard containers, the transportation track is designed as a double track, with platform vehicles consisting of two platform vehicles. First of all, the square personnel puts the materials to be deliveredaccording to the task list in advance, then the intelligent loading vehicle puts the materials into the empty standard container, and finally, the intelligent loading vehicle grabs the full standard container and fixes it on the empty platform vehicles after loading is completed by the transport robot in accordance with the planned route distribution. When the robot carries the empty standard container platform vehicles back, the intelligent loading vehicle grabs the empty standard container and puts it in the specified position. For the coal mine auxiliary transportation system, the types of distribution materials are complicated, as shown in Figure 3. These types of distribution materials include mechanical and electrical products (including wire and cable, high and low voltage electrical appliances, instruments and meters, lighting appliances, electronic components, etc. ), metal materials (including ferrous metal materials, metal processing parts, non-ferrous metal materials, etc. ), non-metallic materials (including wood, sand, asbestos products, refractory materials, glass, bricks and tiles, rubber and plastic products, etc.