Composite control valve group, control loop and hoisting translation control method of crane

Abstract

The invention discloses a compound control valve set, a control loop and a lifting and horizontally-moving control method for a crane. A first inner oil line (L1) connected between a first oil opening (A) and a second oil opening (B) of the valve set is internally provided with an oil inlet on-off valve (1). A second inner oil line (L2) connected between the second oil opening and an oil distribution opening (C) is internally provided with an oil return one-way valve (2), a proportional flow valve (3) and an oil distribution on-off valve (4) in sequence. The proportional flow valve is used for proportionally distributing pressure oil of an oil opening in the inlet end to a proportional oil return opening and a proportional flow distribution opening in the outlet end of the proportional flow valve. In the compound control hydraulic loop, two working loops can be correlated through an oil distribution oil line and the oil distribution opening, relevant control over the amplitude and the winching in the crane of an automobile is achieved, and therefore the horizontally-moving movement of lifted weights is achieved; and in addition, independent control over the amplitude and the winching can be achieved, and therefore operation is convenient, and the requirement for the technique of operation personnel is lowered.

Description

technical field [0001] The invention belongs to the field of cranes, and in particular relates to a hydraulic circuit and a control valve group thereof for compositely controlling the luffing and hoisting of a boom. Background technique [0002] In the hoisting condition of the truck crane, the operator is often required to operate the control handle separately to realize the compound action of the luffing and the main hoist or the compound action of the luffing and the auxiliary hoist, so as to achieve the purpose of hoisting heavy objects for horizontal movement. Among them, the electro-hydraulic control systems for luffing and hoisting actions are independent of each other. The hydraulic oil source of the luffing electro-hydraulic control system is directly connected to the luffing cylinder after being selected by the main valve luffing plate, and the hoisting electro-hydraulic control system The hydraulic oil source is directly connected to the hoisting motor after the r...

AI Technical Summary

Problems solved by technology

However, the trajectory relationship between the luffing hoisting and descending angle and the hoisting and hoisting height is nonlinear, and due to the differences in the parameters of the motor and the reducer, the relationship between the trajectory of the compound action of the luffing and the main hoist is different from that of the luffing and auxiliary hoisting. Composite action trajectory relationship is not the same

When carrying out a large number of horizontal mobile hoisting installation conditions of a single load, due to reasons such as the low level of combined operation of the operator, the hoisting work efficiency will be low

When carrying out joint lifting and horizontal moving hoisting installation conditions of two or more cranes, the height and synchronization of hoisting heavy objects, work safety and hoisting will be seriously affected due to the operator's compound operation level and inconsistent action coordination. More seriously, it will lead to uneven load and overload of a single crane, which will cause serious safety accidents such as rollover

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