Three-cavity type three-position four-way air-control reversing hydraulic valve

Abstract

Disclosed is a three-cavity type three-position four-way air-control reversing hydraulic valve. A valve hole (L) is communicated with a front cavity (G3), a middle cavity (G2) and a rear cavity (G1), an oil return hole (H) and an oil outlet hole (S) are respectively communicated with a hydraulic oil tank (21) and an oil cylinder (24), a horizontal oil return hole (E) and a horizontal oil inlet hole (J) are connected with an oil pump (23), and a lifting air hole (Q2) and a descending air hole (Q1) are communicated a proportional air valve (20) via air pipes (5). The lifting air hole (Q2) intakes air, a valve stem (9) translates backwards, the oil pump (23) supplies oil into a valve body (1) and the oil cylinder (24) in sequence, and the oil cylinder (24) is lifted up. The descending air hole (Q1) intakes air, the valve stem (9) translates forwards, hydraulic oil enters the valve body (1) and returns to the oil pump (23) via the horizontal oil return hole (E), no oil is supplied to the oil cylinder (24), the hydraulic oil in the oil cylinder (24) returns to the valve body (1) via the oil outlet hole (S), partially flows into the oil pump (23) via the horizontal oil return hole (E) and partially flows into the hydraulic oil tank (21) via the oil return hole (H), and thereby oil circulation is formed. The three-cavity type three-position four-way air-control reversing hydraulic valve is small in size, light in weight, good in matching capability, high working efficiency and wide in application range.

Description

technical field [0001] The invention relates to hydraulic components, in particular to a reversing hydraulic valve matched with a lifting oil cylinder. Background technique [0002] Hydraulic valves are widely used in hydraulic systems and are important basic components in hydraulic systems. At present, the lifting cylinders of domestic and foreign dump trucks are mostly equipped with three-position three-way or four-way air-controlled reversing valves with five chambers inside to control the cylinder. The air-operated reversing valve adopts K-type functional type, and a U-shaped two-way oil return channel is set outside the valve hole on the valve body. The shape of the valve body is designed as a long cube, and the rectangular cylinder and the valve body are connected as a whole. Therefore, the valve body is large in size, heavy in weight, difficult to process, and prone to errors of different axes; this air-controlled reversing valve Equipped with a feedback relief valv...

AI Technical Summary

Problems solved by technology

The shape of the valve body is designed as a long cube, and the rectangular cylinder and the valve body are connected as a whole. Therefore, the valve body is large in size, heavy in weight, difficult to process, and prone to errors of different axes; this air-controlled reversing valve Equipped with a feedback overflow valve, it is connected to the outside of the valve body, and it is connected to the inner cavity of the tail of the valve body after three times of inversion. The structure is complex and the workmanship is poor.

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