Hydraulic Breaker Piston Hydrostatic Support and Lubrication Structure

Abstract

The invention provides a novel hydraulic breaking hammer piston static pressure supporting and lubricating structure aiming at the phenomena that the matching surface of a hydraulic hammer piston anda cylinder body is likely to strain and the piston strength is low. According to a hydrostatic pressure bearing piston, pressure oil supplied by a hydraulic system enters a hydrostatic compensation cavity through a throttling hole, the piston is floated in a cylinder body, it is guaranteed that the piston is in a complete liquid friction state with the cylinder body under a certain load at any speed (comprising being static), and due to the fact that lubricating oil with oil pressure is filled between two friction surfaces, the friction surfaces are separated, strain is avoided, the mechanicalefficiency is improved, 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 hammer core of the existing hydraulic breaker mainly includes: nitrogen chamber 1, piston ring 2, cylinder body 3, piston 4, drill rod seat 5, inner sleeve 6, inner sleeve stop pin 7, flat pin 8, outer sleeve 9, outer sleeve stop pin 10. Drill rod 11, inflation ...

AI Technical Summary

Problems solved by technology

[0011] 1. In order to ensure the fit clearance, it is necessary to use an enlarged piston and oil seal (resulting in that the sealing ring in the C area cannot use standard parts and is not universal, which increases the operating cost)

[0012] 2. Cause the cylinder body 3 to be scrapped (because the low carbon steel material used in the cylinder body 3 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)

[0013] 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.

[0014] Although the patents: hydraulic breaker piston static pressure support and lubrication structure (2017101582018), new type hydraulic breaker piston static pressure support and lubrication structure (2018100201583), can ensure that the piston is in a certain load and at any speed (including static). The cylinder body is in a state of complete fluid friction. Since the two friction surfaces are filled with lubricating oil with oil pressure, the friction surfaces are separated to avoid strain, improve mechanical efficiency and prolong service life. However, a shaft is installed on the piston 4. Install threaded holes to the oil circuit, radial oil circuit, static pressure bearing oil cavity and throttle valve, which will inevitably reduce the mechanical strength of the piston 4, but the piston 4 is a part used to strike the drill rod 11, and the impact force it receives is very high. large, easily damaged

Images