Hydraulic pilot control system of crane, control method and crane

Abstract

The invention discloses a hydraulic pilot control system of a crane, a control method and the crane, and relates to the technical field of an engineering machine, wherein the system comprises that a pilot oil path outputs pressure oil to an executing mechanism, a proportional pressure reducing valve (13) is arranged in the pilot oil path; a force limiter (17) detects the load of the crane, and sends the control signal to the proportional pressure reducing valve (13) according to the load; the proportional pressure reducing valve (13) adjusts the oil pressure in the pilot oil path according to the control signal. According to the control system, the control method and the crane thereof, corresponding control signal is output through the force limiter according to different working conditions, and the control pressure output by the pilot oil path is adjusted; the advance pressure adjustment can be applied; the oil supply pressure is switched through an electromagnetic valve; the hydraulic pilot control system can rapidly adjust pressure, reduce the pressure adjusting time; for applying an unidirectional valve+a bypass damp as an oil supply module, the hydraulic pilot control system is small in pressure adjusting bias, high in control precision, and low in cost; the hydraulic pilot control system also can promote the operation comfort and working safety.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a crane hydraulic pilot control system, a control method and a crane thereof. Background technique [0002] At present, the small and medium-tonnage cranes produced by domestic manufacturers generally adopt the hydraulic pilot control method, which has the advantages of low cost, simple control, reliability and maintenance convenience compared with the large-tonnage electronic control operation. However, according to the continuous improvement of control comfort and operation safety by market users, as well as to meet the needs of design standards in different regions, the hydraulically controlled crane reflects some shortcomings, mainly in: 1. Since the hydraulic pilot control output pressure is only the same as The handle is related to the inclination angle, and electrical override interference cannot be performed. Therefore, when deceleration control is required...

AI Technical Summary

Problems solved by technology

However, according to the continuous improvement of market users' control comfort and operation safety, and to meet the needs of design standards in different regions, hydraulic control cranes have reflected some deficiencies, which are mainly manifested in: 1. Since the output pressure of the hydraulic pilot control is only related to the The inclination angle of the handle control is related, and electrical unauthorized interference cannot be performed, so when deceleration control is required, automatic deceleration cannot be realized

2. The existing hydraulic oil supply module can only provide a single oil supply pressure. Under different operating conditions of the crane, due to the single oil supply pressure, hierarchical control cannot be realized

The output pressure of the hydraulic pilot control system of the crane is single, and the output pressure cannot be adjusted according to the operating conditions of the system, and the control is not flexible

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