Hydraulic breaker piston static pressure support and lubrication structure

Abstract

The invention provides a static pressure supporting and lubricating structure for a piston of a hydraulic breaking hammer aiming at the phenomenon that a matching surface of the piston of the hydraulic hammer and a cylinder body is liable to scratch. A hydrostatic pressure supporting piston enters a static pressure compensation cavity through a throttling hole by virtue of the pressure oil supplied by a hydraulic system, and the piston is floated in the cylinder body, so that the complete liquid friction state of the piston and the cylinder body under a certain load and at any speed (including in a static state) is ensured; and lubricating oil with an oil pressure is fully filled between two friction surfaces, so that the friction surfaces are separated to avoid scratch, the mechanical efficiency is increased, and the service life is prolonged.

Description

technical field [0001] The invention relates to a construction machinery attachment, in particular to a static pressure support and lubricating structure for a piston of a hydraulic breaker. Background technique [0002] For crushing stone, concrete, and other construction materials, hydraulic hammers are attached to various machines, such as excavators, backhoes, or other similar machines. The hydraulic hammer is mounted to the arm of the machine and connected to the hydraulic system. The high-pressure fluid in the hydraulic system is supplied to the hydraulic hammer to drive the reciprocating movement of the piston in contact with the work tool, and strike the work tool to complete the crushing task. [0003] The structure of a general hydraulic breaker is shown in Figure 1. The body of the hydraulic breaker mainly includes long bolts 1, nitrogen chamber 2, piston ring 3, cylinder 4, piston 5, drill rod seat 6, inner sleeve 7, flat pin 8 , drill rod 9, overcoat 10, valve...

AI Technical Summary

Problems solved by technology

[0012] 1. In order to ensure the matching clearance, an enlarged piston and oil seal must be used (resulting in that the sealing ring in the D area cannot use standard parts and is not universal, which increases the operating cost)

[0013] 2. Cause the cylinder body 4 to be scrapped (because the low carbon steel material used in the cylinder body 4 must be carburized to increase the surface hardness, after the strain, the secondary grinding will be performed to make the carburized layer thinner or the hardness lowered. If the surface does not have enough hardness, the cylinder will be scrapped)

[0014] Cylinder strain is the main reason for the scrapping of large hydraulic hammer cylinders. This is a common problem of large hydraulic hammers, which wastes manpower, financial resources and resources, and increases construction costs.

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