Compact height adjusting oil cylinder and coal mining machine

Abstract

The invention relates to a compact height adjusting oil cylinder and a coal mining machine. The compact height adjusting oil cylinder comprises a cylinder body, a piston, a piston rod and a guide sleeve, the piston is fixed to one end of the piston rod, the piston is in sliding fit with the inner wall of the cylinder body, the guide sleeve is fixed to an opening of the cylinder body and seals an inner cavity of the cylinder body, the piston rod penetrates through the guide sleeve and is connected with the guide sleeve in a sliding mode, and an anti-falling connecting pin is connected between the guide sleeve and the cylinder body; the coal mining machine comprises a traction part, a cutting part and the compact height adjusting oil cylinder, the two ends of the compact height adjusting oil cylinder are hinged to the traction part and the cutting part respectively, and the compact height adjusting oil cylinder is located below the hinged joint of the traction part and the cutting part. The guide sleeve of the height adjusting oil cylinder can be prevented from falling off, the structure is more compact, and the requirements of low mining height and thin coal seam mining can be better met.

Description

technical field [0001] The invention relates to a height-adjusting oil cylinder and a coal shearer using the height-adjusting oil cylinder, which is suitable for mining of low mining height and thin coal seams. Background technique [0002] The height adjustment cylinder is an important part of the shearer height adjustment system. In order to ensure a certain working thrust and stroke, and to meet the strength requirements, the volume of the height adjustment cylinder is generally large. In the design of thin coal seam shearer, due to space constraints, it is required that the oil cylinder should be designed as compact as possible. [0003] The compact oil cylinder generally has a short stroke. When the mining height of the shearer becomes larger, the piston rod of the oil cylinder will be fully extended, and the piston will directly contact the guide sleeve. The existing compact oil cylinder is too large for the increasingly stringent space-saving design requirements in l...

AI Technical Summary

Problems solved by technology

The existing compact oil cylinder is too large for the increasingly stringent space-saving design requirements in low mining height and thin coal seam mining scenarios, and the frequent action of the piston on the guide sleeve will easily lead to the failure of the threaded connection between the guide sleeve and the cylinder body, thus causing the guide sleeve to fall off

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