Stepless speed-regulation slow-reduction air-controlled distribution valve

Abstract

The invention belongs to an air controlled distribution valve, in particular to a stepless speed-regulation slow-reduction air-controlled distribution valve. The valve comprises a cylinder cap, a cylinder body, a valve body connected with the cylinder body and a valve plug arranged inside the valve body, wherein an oil inlet P, two oil return ports O and an oil outlet A are formed in the cylinder body; a slow-reduction controlling air port B is formed in the cylinder cap; a lift and drop controlling air port is formed in the cylinder body; oil intake and oil return channels are arranged in the cylinder body, and a check valve is arranged between the oil intake and oil return channels; the tail end of the valve body is provided with a plug; an air-controlled slow-reduction piston, an air piston and a cylinder guide sleeve are arranged sequentially in the cylinder body from the cylinder cap to the valve body; the front end of the valve plug is connected with the air piston; a returning spring is sleeved on the valve plug; the dropping ledge surface of the valve plug is provided with at least two damping grooves along the periphery with equal angles; the oil-return channel is communicated with the cavity of the cylinder body outside the valve plug through a pipeline; a seal ring is arranged between the valve body and the plug cap and between the valve body and the cylinder body respectively. The distribution valve is used for solving the problem that a conventional product does not have the stpeless speed-regulation slow-drop function, and has the advantages of being capable of realizing stepless speed-regulation drop-reduction function, easy in assembly and the like.

Description

technical field [0001] The invention belongs to an air-controlled distribution valve, in particular to an air-controlled distribution valve with stepless speed regulation and slow drop. Background technique [0002] The slow-fall air-controlled distribution valve is mainly suitable for the hydraulic system of dump trucks, and is installed and used together with the oil pump. Its main function is to control the lifting, stopping and lowering of the dump truck compartment. At present, the prototypes of similar products were imported from abroad in the 1990s, and their functions and appearance have not changed much since they were used for more than ten years. The applicant disclosed a slow-falling air-controlled distribution valve in the invention patent with the patent number of 03245150.4. This patent mainly realizes the slow-falling function by setting a slow-falling piston inside the cylinder head. During the use of the above prior art, users reported the following probl...

AI Technical Summary

Problems solved by technology

During the use of the above prior art, users reported the following problems: lack of stepless speed regulation and slow down function, the slow down speed of the carriage will be accelerated due to the increase in load weight, and the operator’s lack of response will easily cause damage to the frame due to impact

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