Two-way height-adjusting valve group for thin coal seam shearer

Abstract

The invention relates to a bi-directional vertical steering valve group for a thin-seam coal mining machine. By the adoption of a combination valve structure, the bi-directional vertical steering valve group is formed by an integrated valve group and a manually and hydraulically reversing valve group which are fixedly connected and arranged in an up-and-down stacked mode, the space between oil ports formed in the faces, attached to two valves, of an oil line for communication the two valves respectively is sealed through an O-shaped ring, and the manually and hydraulically reversing valve group includes two three-position four-way manually and hydraulically reversing valves connected in parallel, a left electromagnetic reversing valve and a right electromagnetic reversing valve, wherein the left and right electromagnetic reversing valves are connected in parallel and serve as reversing valves of the hydraulically controlled portions of the two manually and hydraulically reversing valves. According to the bi-directional vertical steering valve group for the thin-seam coal mining machine, a left loop and a right loop are controlled separately, the purpose can be achieved that the manual and automatic modes of left and right swing arms of a coal mining machine are synchronously subjected to vertical steering, and the bi-directional vertical steering valve group has the function of hydraulic braking; because the bi-directional vertical steering valve group is simple in structure, reasonable in layout, easy to process and mount and more convenient to maintain and replace, and therefore the cost is saved.

Description

technical field [0001] The invention relates to a valve group for adjusting the height of a rocker arm of a coal mining machine, belonging to the technical field of coal mining machinery. Background technique [0002] Usually, the shearer drives the height adjustment cylinder through the hydraulic system to expand and contract to achieve the purpose of height adjustment of the rocker arm. The height adjustment valve group is a very important part of the hydraulic system and an important guarantee for the realization of the height adjustment function. [0003] For a long time, due to the narrow space of the underground working face in the thin coal seam and the compact structure of the shearer, the existing height control valve group has been limited by the installation space for a long time. The time can only be adjusted for one side of the rocker arm, and the other side of the rocker arm can be adjusted after changing the direction, and the left and right rocker arms cannot...

AI Technical Summary

Problems solved by technology

[0003] For a long time, due to the narrow space of the underground working face in the thin coal seam and the compact structure of the shearer, the existing height control valve group has been limited by the installation space for a long time. The time can only be adjusted for one side of the rocker arm. After changing the direction, adjust the other side of the rocker arm. It is impossible to adjust the height of the left and right rocker arms at the same time.

Not only that, this type of height-adjusting valve group generally adopts the structure of an integral integrated valve block. Although the integration degree is high, the internal structure of the integrated valve block is complex, processing and installation are inconvenient, and once damaged, the replacement cost is high

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