An adaptive buffer hydraulic speed limit cutting device, system and method

Abstract

The invention belongs to the technical field of hydraulics, and in particular relates to an adaptive buffering hydraulic speed-limiting cut-off device, system and method, aiming at solving the severe load shock and impact on the hydraulic system caused by the action of the existing machine-hydraulic speed-limiting cut-off valve. question. The hydraulic speed limiting cut-off device includes an accumulator and an adaptive cut-off valve. The adaptive cut-off valve includes a hydraulic valve body. The hydraulic valve body is provided with a main oil circuit chamber and a buffer oil circuit chamber arranged side by side. There is a cut-off valve core and an orifice A. The cut-off valve core is provided with a setting screw A, a return spring A, and two openings that communicate with its inner cavity and respectively lead to the main oil circuit chamber and the buffer oil circuit chamber. A self-adaptive valve core and an orifice B are arranged in the buffer oil circuit chamber, a setting screw B and a return spring B are arranged on the self-adaptive valve core, and the accumulator is connected with the buffer oil circuit chamber. The hydraulic speed limit cut-off device can make the load softly brake when the load falls over speed.

Description

technical field [0001] The invention belongs to the technical field of hydraulics, and in particular relates to an adaptive buffering hydraulic speed limiting cutting device, system and method, which are applied to construction machinery, hydraulic lifting platforms and other occasions. Background technique [0002] Due to its large power-to-weight ratio, hydraulic transmission is easy to achieve stepless speed regulation and precise control, and its motion is stable, and it is widely used in logistics, transportation, marine, construction and other fields. In the actual application process, it is very common to realize vertical load lifting and lowering, such as excavators, cranes, hydraulic elevators, offshore platforms, etc. In these occasions, in order to prevent the load from falling at overspeed due to pipeline rupture, loose joints, etc., a speed-limiting shut-off valve (also known as a pipeline rupture valve) must be installed. That is, when the speed limit cut-off ...

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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a hydraulic speed-limiting cut-off device, system and method that can make the load softly brake and adaptively buffer when the load descends at an overspeed, aiming at solving the problem of the existing organic-hydraulic speed-limiting cut-off valve. The severe vibration of the load caused by the action and the impact on the hydraulic system

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