A double-pump external valve confluence system suitable for excavator breaker

Abstract

The present invention relates to a dual-pump external valve confluence system suitable for excavator breakers, which improves the existing hydraulic system of excavators. The existing second main pump supplies oil to the hydraulic breaker through a multi-way valve. The oil circuit of the main pump remains unchanged, and the oil circuit of the first main pump is changed through two valve blocks. According to whether the crushing pilot valve supplies oil, whether the spools of the pressure sequence valve and the confluence valve are opened, and then the spool of the priority flow control valve is controlled. Whether to supply oil to the multi-way valve, or directly to the hydraulic breaker, or to supply oil to the multi-way valve and the hydraulic breaker at the same time; during the working process of the hydraulic breaker, the high-pressure oil is outside the original valve group of the excavator It only needs to pass through two valve blocks to reach the hydraulic breaker, which not only avoids the problem of a large amount of pressure loss and a large amount of heat generated by the confluence system in the traditional valve, but also makes full use of the dual pumps of the excavator, and the excavator of the same tonnage can be installed The larger breaker greatly improves the mechanical performance of the excavator.

Description

technical field [0001] The invention relates to the field of excavators, in particular to a double-pump valve external confluence system suitable for the breaker of the excavator, which can greatly improve the performance of the breaker. Background technique [0002] For the 20T-50T excavators on the market, the breakers installed are supplied by a single pump. Due to the limitation of single pump oil supply, the breaker installed on the excavator can only be a smaller breaker. For example, Sany’s SY365 excavator can only be equipped with a 165mm (drill rod diameter) breaker if the oil is supplied by the existing single pump. If a larger breaker is used, it will not work normally under the single pump oil supply. If the double-pump oil supply method is adopted, a 175 or 180mm (drill rod diameter) breaker can be installed, so some users install a 175 or 175 or 180mm (drill rod diameter) breaker through the method of confluence in the double-pump valve (the function originally...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the technical problem to be solved by the present invention is to add a double-pump external valve confluence system on the basis of the existing hydraulic system of the excavator to solve the problems of pressure loss and temperature rise caused by the traditional internal valve confluence system, and at the same time Make full use of the machine performance of the excavator and increase the application range of the breaker that can be installed

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