Double-pump valve outside flow-converging system suitable for breaking hammer of excavator

Abstract

The invention relates to a double-pump valve outside flow-converging system suitable for a breaking hammer of an excavator. A hydraulic system of an existing excavator is improved. An existing oil way, supplying oil to the hydraulic breaking hammer through a multi-way valve, of a second main pump is not changed, and an oil way of a first main pump is changed through two valve blocks. According to whether a breaking pilot valve supplies the oil or not, a valve element of a pressure sequence valve and a valve element of a flow-converging valve are controlled to be opened or not, and therefore a valve element of a preferential flow control valve is controlled to supply the oil to the multi-way valve or directly supply the oil to the hydraulic breaking hammer or supply the oil to the multi-way valve and the hydraulic breaking hammer simultaneously. In the working process of the hydraulic breaking hammer, the high-pressure oil can reach the hydraulic breaking hammer only through the two valve blocks outside an original valve set of the excavator. The problem that a traditional valve inside flow-converging system loses much pressure and consequently a great amount of heat is generated is solved, and meanwhile the double pumps of the excavator are fully used. The larger breaking hammer can be mounted on the excavator of the same tonnage, and the mechanical properties of the excavator are greatly improved.

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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