Dual-pump bidirectional confluence control system and fire truck adopting same

Abstract

The invention provides a dual-pump bidirectional confluence control system and a fire truck adopting the same, and aims to reduce energy loss and lower system temperature rise. The control system comprises a first oil pump for supplying oil for a levelling cylinder, as well as a second oil pump for supplying oil for a telescopic cylinder and a variable amplitude cylinder; the two oil pumps are driven coaxially; a first pressure compensator and a second pressure compensator for adjusting flow are arranged at the oil outlets of the two oil pumps respectively; the levelling cylinder, the telescopic cylinder and the variable amplitude cylinder are controlled through a levelling reversing valve, a telescopic reversing valve and a variable amplitude reversing valve respectively; oil unloading openings and oil supplement openings are formed in the levelling reversing valve, the telescopic reversing valve and the variable amplitude reversing valve respectively; when each reversing valve is positioned at a neutral position, each oil unloading opening is communicated with the corresponding oil supplement opening; the oil outlet of the first pressure compensator is communicated with the oil supplement opening of the telescopic reversing valve and the oil supplement opening of the amplitude reversing valve through an oil supplement oil line; the oil outlet of the second pressure compensator is communicated with the oil supplement opening of the levelling reversing valve through another oil supplement oil line; the oil supplement oil lines are communicated with the oil inlets of the corresponding reversing valves through on-off valves respectively.

Description

technical field [0001] The invention relates to the technical field of fire trucks, in particular to a dual-pump bidirectional confluence control system and a fire truck using the system. Background technique [0002] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a fire truck on a climbing platform in the prior art. [0003] The boarding action of the climbing platform fire truck mainly includes boom luffing, boom telescoping and working platform leveling. Correspondingly, there are luffing cylinder 1', telescopic cylinder 2', leveling cylinder 3', 'also includes boom luffing cylinder 11' and small arm luffing cylinder 12'. Among them, the leveling of the working platform is controlled by the angle detector in real time. When the luffing cylinder 1' moves, the angle of the boom will change, and the working platform will tilt accordingly. At this time, the angle detector outputs an inclination signal to control the leveling Cylinder 3' moves,...

AI Technical Summary

Problems solved by technology

For large pumps, the flow rate needs to meet the maximum flow demand, and the actuator operates. When only the small flow rate actuator is operated, the excess flow of the hydraulic pump will overflow back to the oil tank, resulting in energy loss and faster heat generation.

When doing telescopic action, the angle of the boom does not change, and there is no action for leveling at this time. For the small pump, all the flow flows back to the oil tank, which also causes energy loss; on the other hand, the flow of the small pump is only It needs to meet the flow rate of normal automatic leveling action. When the leveling failure of the working platform occurs or manual leveling is required, the flow rate of the small pump is not enough, resulting in slow action

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