Control system of telescopic boom bolt mechanism

Abstract

The invention discloses a control system of a telescopic boom bolt mechanism, which comprises an oil tank, a hydraulic pump, a motor and a second directional control valve which are arranged on a telescopic boom, wherein the oil tank is used for storing hydraulic oil; the hydraulic pump is used for outputting the hydraulic oil in the oil tank into a hydraulic circuit; the motor is used for driving the hydraulic pump; and the second directional control valve is used for controlling the route between the hydraulic circuit and the hydraulic pump or the oil tank to be turned on. Preferably, the control system also comprises a third one-way valve, an energy accumulator and a pressure relay; when a pressure value detected by the pressure relay is more than a preset maximum pressure value, the pressure relay outputs control signals to the motor, and the motor is switched off; and when a pressure value detected by the pressure relay is less than the maximum pressure value, the pressure relay outputs control signals to the motor, and motor is switched on. The system has simple and reasonable design, and can effectively avoid the problem that hydraulic volume in a large chamber influences the control response speed, so as to ensure the sensitive and reliable motions of an arm pin hydro cylinder and a cylinder pin hydro cylinder.

Description

technical field [0001] The invention relates to the field of engineering machinery hydraulic control, in particular to a control system for a telescopic arm latch mechanism. Background technique [0002] The bolt mechanism is the key executive component to realize the control of the telescopic boom of medium and large tonnage cranes, and it is fixed at the cylinder head of the boom telescopic cylinder. Please refer to Figure 1, which shows a working diagram of the latch mechanism controlled by a single-acting cylinder, as Figure 1a As shown, the arm pin 10 is stretched out under the action of the arm pin spring 20 to realize the locking between adjacent boom sections, and the cylinder pin 30 is stretched out under the action of the cylinder pin spring 40 to realize the locking between the arm sections and the oil cylinder ;Such as Figure 1b As shown, the arm pin 10 is retracted under the drive of the arm pin oil cylinder (not shown in the figure) to realize the unlocking ...

AI Technical Summary

Problems solved by technology

However, in order to eliminate the impact of the pressurized core tube on the force of the telescopic cylinder, the hydraulic control system needs to be coordinated with a complex design. The pump needs a large displacement and long-term operation, and there is a problem of increased energy consumption; The limitation of core tube structure, high processing cost

Another way is to use two hydraulic hose reels to realize dual-way oil supply. The control system is double-acting control, the hose reels require a large layout space, and the hose connection reliability is poor

[0004] Since the existing control system of the bolt mechanism takes long-distance oil from the crane turntable, the pipeline is long, and the liquid capacity of the large cavity affects the control response speed

Therefore, the above two schemes all have the problem of control lag

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