Double-pump two-way confluence control system and fire truck using this system

Abstract

The invention provides a double-pump two-way confluence control system and a fire truck using the system to reduce energy loss and system temperature rise. The two-pump two-way confluence control system includes a first oil pump that supplies oil to the leveling cylinder and a second oil pump that supplies oil to the telescopic cylinder and the luffing cylinder. The two oil pumps are coaxially driven, and the oil outlets of the two are respectively equipped with The first pressure compensator and the second pressure compensator to adjust the flow rate, the leveling cylinder, the telescopic cylinder and the luffing cylinder are respectively controlled by the leveling reversing valve, the telescopic reversing valve and the luffing reversing valve, the leveling and reversing valve, telescopic reversing valve and luffing reversing valve all have an oil discharge port and an oil replenishment port. When in the neutral position, the oil discharge port communicates with the oil replenishment port; The oil supply port of the telescopic reversing valve is connected with the oil supply port of the luffing reversing valve, the oil outlet of the second pressure compensator is connected with the oil supply port of the leveling reversing valve through the oil supply circuit, and each oil supply The oil passage communicates with the oil inlet of the corresponding reversing valve through the switching valve.

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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