Beijing North Zhongyi Heavy Machinery Co., Ltd. : Safety of crane speed limit 9(8)
Description：(2) Speed limit with manual directional valveIn all the reversing valve, only manual reversing valve....
(2) Speed limit with manual directional valve
In all the reversing valve, only manual reversing valve in the direction at the same time, through the control of the size of the opening of the valve can be both speed limit and throttle speed regulation. Therefore, when the truck crane mechanism or load occurs downward acceleration phenomenon, the driver can reduce the pulling degree of the manual reversing valve handle to reduce the valve opening to solve the problem. , of course, because the driver a shaking of the hand can make the manual directional control valve. Limit the effect is not very ideal, but because of truck crane and unloading speed is likely to be constantly on the basis of the condition of the construction site of the adjustment, the movement of institutions often for discontinuous intermittent operation, so the skilled pilot control manual reversing valve or a certain speed limit effect can be received.
In short, the truck crane lifting weight, boom expansion, boom amplitude 3 institutions both locking and speed limit requirements, should be able to meet the locking and speed limit two requirements of the balance valve, and then mechanical braking.
This article is organized by Beijing North Zhongyi Heavy Machinery Co., Ltd
