Graded propelling type efficient coal mining machine cutting device and method

Abstract

The invention provides a graded propelling type efficient coal mining machine cutting device and method. The device comprises a machine body, a driving mechanism, a rocker arm, a posture adjustment hydraulic cylinder, a speed changing box, a leveling hydraulic cylinder and three rollers; a plurality of cutting teeth are uniformly distributed in the peripheral direction of the rollers; the sizes ofthe cutting teeth of the three rollers are gradually reduced and are distributed in an axial gradient; the driving mechanism is hinged to the machine body; the rocker arm is connected with the driving mechanism; the posture adjustment hydraulic cylinder is connected between the machine body and the driving mechanism; the speed changing box is hinged to the rocker arm; the leveling hydraulic cylinder is connected between the speed changing box and the rocker arm; the speed changing box is provided with three power output shafts which comprise a low-speed power output shaft, a middle-speed power output shaft and a high-speed power output shaft in sequence; the three rollers are fixedly arranged on the three power output shafts respectively. According to the graded propelling type efficientcoal mining machine cutting device and method, provided by the invention, graded propelling is realized by adopting the three rollers through different cutting teeth and rotary speeds, and cutting resistance, cutting tooth loss and energy consumption of a cutting motor are reduced; the sizes of cut coal blocks are uniform, and collapsing, rib spalling and chain clamping phenomena of large coal blocks are avoided; the subsequent coal block crushing working amount is reduced; the mining efficiency and conveying efficiency of coal are improved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a cutting device and method for a graded push-type high-efficiency coal shearer. Background technique [0002] For traditional coal shearers, the drum is similar to a cylinder. During the cutting process, due to the large cutting depth, the cutting arc surface of the drum will contact with the coal wall interface of the entire cutting depth, resulting in The teeth and the cutting motor need to bear a huge load, resulting in accelerated wear of the pick and huge energy consumption of the cutting motor, thereby increasing the economic investment in the mining process. [0003] In addition, when the cutting operation is carried out by the traditional shearer drum, due to the large cutting depth, huge vibrations will be generated during the collision between the pick and the coal wall interface, which will easily cause the collapse of large coal blocks or even Phenom...

AI Technical Summary

Problems solved by technology

[0002] For traditional coal shearers, the drum is similar to a cylinder. During the cutting process, due to the large cutting depth, the cutting arc surface of the drum will contact the coal wall interface at the entire cutting depth, resulting in The teeth and cutting motors need to bear huge loads, resulting in accelerated wear of the picks and huge energy consumption of the cutting motors, thereby increasing the economic investment in the mining process

[0003] In addition, when the traditional shearer drum is used for cutting operations, due to the large cutting depth, huge vibrations will be generated during the collision between the pick and the coal wall interface, which will easily cause large coal blocks to collapse or even collapse. Phenomena such as chipping will not only lead to an increase in the workload of subsequent coal crushing, but will even cause the scraper conveyor to appear stuck in the chain, thereby greatly reducing the mining efficiency and transportation efficiency of coal.

Images