Bidirectional hydraulic buffer

Abstract

The invention discloses a bidirectional hydraulic buffer, which comprises a hydraulic cylinder, two pistons and piston connecting rods, wherein the two pistons are arranged in the hydraulic cylinder, and the piston connecting rods extend into the hydraulic cylinder from two ends of the hydraulic cylinder respectively and are connected with the two pistons respectively. The internal space of the hydraulic cylinder is divided into an outer cavity and an inner cavity by the two pistons, a channel for buffer liquid to pass through is arranged between the outer cavity and the inner cavity, the two pistons oppositely slide in the hydraulic cylinder, a spring for returning the pistons is arranged between the two pistons, and the distance between the two pistons is no less than the travel of the bidirectional hydraulic buffer when no external impact force is applied. The bidirectional hydraulic buffer is simple in structure and solves the problem that bidirectional buffer cannot be realized in a limited space in the prior art.

Description

technical field [0001] The invention relates to a buffer, in particular to a two-way hydraulic buffer. Background technique [0002] The existing hydraulic buffers generally use a piston connected to the piston rod to move in a hydraulic cylinder filled with buffer fluid to buffer the external impulse transmitted by the piston rod. With the development of society, new forms of hydraulic buffers are needed. To meet different needs, for example, two-way buffering is required at the same working position of some equipment, that is, the two directions alternately generate the pressing force that needs to be buffered by the buffer. At this time, two piston rods are required to be symmetrically arranged, and these two The piston rod can alternately buffer the pressing force from both directions. [0003] Chinese patent document CN1309250A discloses a two-way buffer, which includes a two-way rod two-way piston assembly, which can alternately buffer the impact force from two direct...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent document CN1309250A discloses a two-way buffer, which includes a two-way rod two-way piston assembly, which can alternately buffer the impact force from two directions, but because the buffer is used for buffering The piston rods with two-way momentum are connected as a whole. When one end reaches the buffer limit position, the other end can be fully extended. If the impulse from the outside is not constant, the other end may not be able to reach the working position. At the same time, the prior art When the buffer works, it can only work under the condition that the impulse forces in both directions are alternated successively. If one end is continuously impacted twice, the other end is impacted once. In this case, the buffer of the prior art cannot work. Or, if it is necessary to dampen the impact from both directions at the same time, then this prior art buffer will not work

[0004] Chinese patent document CN201851578U discloses a hydraulic buffer, which includes a piston rod connected to the piston, and a spring is arranged between the piston and the bottom of the hydraulic cylinder. Drive the piston to move under the action and compress the spring. When the external impulse buffered by the piston rod disappears, the piston rod and the piston can return to their original positions under the action of the spring. If a two-way buffer can be installed to allow the piston to return to its original position The spring in the position will be able to solve the problem in the patent document CN1309250A, but because the two pistons and piston rods of the buffer in the patent document CN1309250A are connected together, and the direction of movement is opposite, so the two piston rods cannot be reset at the same time, so the spring Can't get it to work

If two sets of buffers disclosed in CN201851578U can be symmetrically arranged on the working position that requires two-way buffering, the problem in the patent document CN1309250A can also be solved, but in this case a larger working space is needed to accommodate the two sets of buffers. If there is no such space in its working position, it will not be able to be installed. If the volume of the hydraulic buffer is reduced proportionally, the stroke will be reduced accordingly, and the buffering effect will not be achieved.

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