Down slow pneumatic control distributing valve

Abstract

The invention provides a down slow pneumatic control distributing valve comprising a valve body, a slide seal valve core, a cylinder body, and a commutation piston in the cylinder body; the improvements are that a down slow piston is arranged between the commutation piston and a cover plate, and sealed with the cylinder body; a first air inlet is arranged between the commutation piston and the down slow piston; the cover plate is provided with a second air inlet; a journey limit sleeve mounting structure is arranged in the cylinder body, a mounting step is arranged in the cylinder body, the journey limit sleeve is sealed with a cylinder body cavity in a slide manner, and limited by the mounting step; the center of the cover plate on the tail portion of the cylinder body is provided with an adjusting bolt; the head of the adjusting bolt extends into the cylinder body. When down slow is needed, compressed air passes the second air inlet, the down slot piston pushes the commutation piston and the valve core to move for certain distance under air pressure effect, thus reducing an oil return channel, and realizing reliable and stable down slow speed; in addition, the journey limit sleeve mounting structure in the cylinder body is simple, so the journey limit sleeve is convenient to make and assemble.

Description

technical field [0001] The invention relates to an air-controlled distributing valve with a constant-speed slow-down function, which is matched with a vehicle lifting device controlled by a hydraulic system. Background technique [0002] In the field of dump trucks, air-controlled distribution valves have been widely used to control the lifting of dump truck containers. In the structure of the air control distribution valve, the Hyva type 200L / min three-hole air control valve is generally used. The air control valve adopts a proportional control method to adjust the speed of the tank’s descent, and the speed adjustment is operated by a manual valve installed in the cab. The rotation angle of the handle is used to realize the control, but in actual use, due to the complex and changeable working conditions, the accuracy of the control decline is often difficult to control, resulting in poor speed control when slow speed is required, resulting in vehicle and personnel casualtie...

AI Technical Summary

Problems solved by technology

In the structure of the air control distribution valve, the Hyva 200L / min three-hole air control valve is generally used. The air control valve adopts a proportional control method to adjust the descending speed of the large tank, and the speed adjustment is operated by a manual valve installed in the cab. The rotation angle of the handle is used to realize the control, but in actual use, due to the complex and changeable working conditions, the accuracy of the control decline is often difficult to control, resulting in poor speed control when slow speed is required, resulting in vehicle and personnel casualties

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