Bidirectional balance double-acting buffer device for hydraulic cylinder piston

A buffer device and double-acting technology, applied in the hydraulic field, can solve the problems of increasing the weight of the oil cylinder, increasing the number of parts, and the complex structure of the buffer technology, so as to ensure reliability and stability, easy processing and assembly, and ease the cumbersome assembly.

CN112112861AInactive Publication Date: 2020-12-22XCMG HYDRAULICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-12-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of hydraulic pressure, and particularly relates to a bidirectional balance double-acting buffer device for a hydraulic cylinder piston. The buffer device comprises a valve element I, a valve element II and a valve sleeve body. The piston is provided with a through valve groove in the axial direction, the valve element I and the valve element II are arranged in the valve groove and each comprise an oil blocking part and a buffering part, an elastic piece is arranged between the oil blocking part of the valve element I and the oil blocking part of thevalve element II, the valve element I is axially limited by a shaft shoulder of the valve groove, and the valve element II is axially limited by the valve sleeve body installed on the piston. When the oil blocking part of the valve element I is in close contact with the shaft shoulder of the valve groove, the buffering part of the valve element I extends to the outer side of the piston. When theoil blocking part of the valve element II is in close contact with the valve sleeve body, the buffering part of the valve element II extends to the outer side of the piston. According to the buffer device, the two valve elements are arranged at the two ends of the piston and connected through the elastic piece, the hydraulic cylinder achieves bidirectional buffering, and two times of buffering areachieved through the elastic piece and the two valve elements in the buffering process.
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Description

Technical field

[0001] The invention belongs to the technical field of hydraulics, and particularly relates to a two-way balanced double-acting buffer device for a hydraulic cylinder piston.Background technique

[0002] The conventional limit displacement buffer structure of the oil cylinder is a combination of adding a buffer sleeve and adding a buffer groove on the guide sleeve and adding a plunger at the end of the piston rod. This structure relies on the guide sleeve groove and the guide sleeve when the limit displacement is about to be reached. When the buffer sleeve is combined, high pressure is generated in its rod cavity to increase the working resistance and reduce the displacement speed of the piston rod, thereby achieving the purpose of buffering; but the high pressure generated at the moment has a higher impact on the wall thickness of the cylinder. It is rarely used on oil cylinders with low telescopic frequency. When resetting, the buffer plunger enters the oil port first, a...

Examples

Embodiment Construction

[0014]The present invention will be further described below based on the drawings and embodiments.

[0015]Such asfigure 1As shown, a hydraulic cylinder piston two-way balanced double-acting buffer device, a piston 7 is placed in the cylinder tube 1 of the hydraulic cylinder, and the piston rod 2 is fixed to the piston 7 through a bolt 9 and a washer 8. The piston 7 is provided with a through valve groove 10 along the axial direction, and the valve groove 10 is used to communicate the large cavity and the small cavity of the hydraulic cylinder. A valve core I3 and a valve core II5 are arranged in the valve groove 10, and both the valve core I3 and the valve core II5 include an oil blocking part (the oil blocking part is used to control the oil passage of the valve groove 10 to connect the large cavity and the small cavity of the hydraulic cylinder The oil blocking part of spool Ⅰ3 and the oil blocking part of spool Ⅱ5 are both located inside the valve groove 10, and the oil blocking pa...