Automatic height-adjusting test device of coal mining machine roller and control method

Abstract

The invention relates to an automatic height-adjusting test device of a coal mining machine roller and a control method. The device comprises a device body, a rocker arm, a roller, a height adjusting pump station, sensors, an inclined angle controller and a displacement controller, wherein the device body is articulated with the rocker arm; the output end of the rocker arm is connected with the roller; the height adjusting pump station is used for driving the rocker arm and the roller to move by an oil cylinder and simulating the running condition of a coal mining machine; the inclined angle sensors are arranged on both the device body and the rocker arm; the displacement sensor is arranged on the oil cylinder; the output of the inclined angle sensors on the device body and the rocker armis compared with a corresponding inclined angle preset value, and an error is used as the input of the inclined angle controller; the output of the inclined angle controller is used as a preset valueof the oil cylinder displacement controller and compared with the output data of the oil cylinder displacement controller, and an error is transmitted to the oil cylinder displacement controller; andthe output of the oil cylinder displacement controller is used for controlling the opening and the direction of a servo valve and realizing the height adjustment of the roller. The invention is used for a test for researching the change of a cutting medium on the performance requirement of the roller height adjusting device and a test for researching the influence of oil cylinder displacement fluctuation on the height of the roller.

Description

technical field [0001] The invention relates to an experiment device and a control method for automatic height adjustment of a shearer drum, and is especially suitable for simulating an oil cylinder servo control experiment of the automatic height adjustment device of a coal shearer drum in a mine. Background technique [0002] Coal mining machine is a very critical equipment in coal mine production. However, its working environment is very harsh. The comprehensive mechanization of coal mining and the automatic control of its working process have become an important means for the coal industry to increase output, improve labor efficiency, reduce major vicious accidents and improve working conditions. . The automatic height adjustment control technology of the shearer drum is one of the key technologies to realize the automatic control of the coal mining face. At present, in practical applications, the height adjustment of the shearer drum is mostly manually adjusted based o...

AI Technical Summary

Problems solved by technology

During the cutting process of the coal shearer, due to the heterogeneity and anisotropy of coal and the random distribution of hard inclusions, the cutting force on the pick is randomly changed; at the same time, due to the huge rotation of the rocker arm Inertia, in the process of shearer cutting and height adjustment, will inevitably cause hydraulic shock to the height adjustment hydraulic system, resulting in fluctuations in cylinder displacement

At the same time, the hydraulic impact changes the temperature of the hydraulic oil, and hydraulic transmission is sensitive to oil temperature changes, so the hydraulic oil temperature has a significant impact on the displacement fluctuation of the oil cylinder

In addition, due to the inherent compressibility of hydraulic oil and the inherent leakage of the hydraulic system, in practical applications, even under the action of static loads caused by the weight of the rocker arm and drum, the displacement of the piston rod of the heightening cylinder will Subsidence changes

The fluctuation of the piston rod displacement of the height adjustment cylinder will cause the change of the inclination angle of the fuselage and the rocker arm, and will further affect the opening and flow of the servo valve, thereby affecting the height of the drum, that is, the fluctuation of the displacement of the height adjustment oil cylinder will interfere with the height of the drum , which will increase the number of position adjustments when the roller is adjusted in height, which will affect the control accuracy, control speed and control stability of the height adjustment control system

Images