A soft measurement method for cutting load of coal shearer

Abstract

The invention discloses a coal shearer cutting load soft measurement method, comprising step 1, detection of current and rotational speed signals; step 2, collection of current and rotational speed signals; step 3, calculation of current effective value; step 4, effective current The wavelet noise reduction of the value; step five, establishing the ELM neural network model of the cutting load; step six, obtaining the cutting load of the coal shearer. The method of the invention has simple steps, reasonable design and high measurement accuracy, can accurately measure the shearer cutting load according to the current of the cutting motor and the rotating speed of the motor, and has strong practicability.

Description

technical field [0001] The invention belongs to the technical field of coal mine automatic mining, and in particular relates to a soft measurement method for cutting load of a coal shearer. Background technique [0002] The drum is the working mechanism of the shearer, and the load on the drum has an important impact on the stress state, production efficiency, cutting energy consumption and working reliability of the structural parts of the shearer. At present, there are mainly the following methods for measuring the shearer cutting load: [0003] (1) The current conventional measurement method is to obtain the corresponding coal mine rock hardness through experimental testing of coal mine rock samples, and calculate the cutting resistance coefficient on the basis of obtaining the coal mine rock hardness to obtain the cutting force of a single pick And torque, so as to get the shearer cutting load. However, due to the complexity of coal occurrence conditions, the physical ...

AI Technical Summary

Problems solved by technology

Although the detection is convenient and easy to install, due to the harsh working conditions and environmental conditions of the coal mining face in the coal mine, the detection instruments used to detect the cutting load of the shearer must have good explosion-proof, moisture-proof, and anti-interference performances. Moreover, due to the small space underground in coal mining, the detection instruments used are required to be small in size, so the requirements for detection instruments are very high. In addition, the detection instruments also have maintenance problems, which are not suitable for long-term real-time detection underground;

[0005] (3) By establishing a virtual prototype of the rocker arm of a coal shearer and analyzing the dynamic characteristics of the flexible rocker arm shell, the cutting load is calculated. Since it applies a step and sinusoidal load at the extension end of the rocker arm, it is difficult to realistically It reflects the stress situation in the actual working process of the shearer, so its detection accuracy cannot be guaranteed;

However, due to the harsh environment of the coal mine, it is difficult to obtain the rock parameters of the coal mine

Images