Research on collaborative optimization of cutting and conveying of separated auger drill

Abstract

Auger drilling tool is widely used in mining, exploration and security and other fields, is an important part of mine equipment, aiming at the best cutting speed and conveying speed of drill tool mismatch. In this paper, a new type of separated drill tool structure is proposed to realize the independent control of the bit cutting speed and the drill pipe conveying speed. The discrete element numerical simulation method is used to establish the bit cutting specific energy consumption model, and the drill pipe mechanical analysis method is used to establish the mathematical model of drill pipe conveying specific energy consumption. According to the multi-objective optimization theory, the minimum sum of drill pipe cutting specific energy consumption and conveying specific energy consumption is taken as the goal. The collaborative optimization of drilling tool cutting and conveying parameters is carried out, and the optimization results show that: Under the condition of constant total installed power of drilling tool cutting and conveying, traditional drilling tool cutting and conveying share the same motor, which has the power concentration advantage. The drilling tool can reach the rated power output of the motor under different working conditions, effectively improve the feed speed of drilling tool and increase the mining efficiency of drilling tool per unit time, while the separated drilling tool splits the total power of the motor, part of which is used for bit cutting. One part is used for drill pipe conveying, and the two parts are independent of each other. The rated power output of the cutting motor is adjusted in the process of drilling tool mining, while the output power of the conveying motor is adjusted according to the needs of material conveying. As a result, part of the power of the conveying motor cannot be fully played in idle state. Due to the low feed speed of drill pipe, when drill pipe and drill bit rotate at the same speed, the unit time conveying capacity of drill pipe will be higher than the cutting capacity of drill bit, resulting in ineffective work of part of drill pipe, resulting in a waste of motor energy consumption. The separated drill pipe can match the conveying capacity of drill pipe according to the cutting capacity of drill bit. Avoid the conveyer motor to do too much ineffective work so as to reduce the specific energy consumption of drill output, and with the increase of drilling depth, the advantages of low energy consumption of separated drill gradually reflect. By making the physical model of the separated drill tool, the collaborative optimization performance of the separated drill tool is verified by experiments. The test results show that: under the same working condition, the drill bit and drill pipe have better mining performance after collaborative optimization. Compared with the traditional drill tool, the feed speed is increased by 2.98%, the cutting specific energy consumption is reduced by 5.63%, and the conveying specific energy consumption is reduced by 0.81%. The experiment verifies the effectiveness of the collaborative optimization effect of the separated drill and provides a reference for green drilling.

Keywords

• new coal mining drilling tools
• multi-objective optimization
• cooperative control
• cutting
• drilling