Five-parallelled composite proportional operating valve set

Abstract

Pentalogy compound arbitrated valve block of this invention can work for five operation unit: gyration, dilation, amplitude, Jan winder and main hoist. That can make infinitive speed governing and different load with parade infinitive speed governing come true. Gyroscope provides oil for separate lubropump P1. It can be divided into feeder road for decompression and pressure limiting. It can support the above system the unchanged controlling pressure source. The system of gyroscope oil return can regulate counterbalance valve for supporting gyration stability. Besides, dilation, amplitude, Jan winder and main hoist use P2 and P3 pumps for supporting oil together. This can improve the speed of bracket arm and amplitude. All are designed with load sensitive information loop. Besides, the design of dilation, amplitude, Jan winder, main hoist, common diverter valve PC2 and relief valve R2 has special structure trigeminy damp for improving diverter valve PC2 star-stop. The design also adapts the outing screw-fit installation. This method is convenient for assembling, debugging and repairing. Pentalogy compound arbitrated valve block are used modular structure and stacked consolidation to reach highly unitized and serialized level. It also uses the means which can regulate pressure and flow for customers' convenience and market.

Description

technical field [0001] The invention relates to the field of a hydraulic transmission control device. In particular, the utility model relates to a five-connection composite proportional control valve group for controlling an actuator of a hydraulic truck crane. The present invention is widely applicable to all kinds of hydraulic truck cranes in construction machinery, including the steering and turning mechanism, the luffing mechanism, the telescopic mechanism, the main winch and the auxiliary winch of the hydraulic system of the upper circuit of the tire type and crawler cranes, so that they are not subject to changes in external loads. It can control several actuators with different external load pressures at the same time, and can obtain a constant control pressure source from the inside to provide the hydraulic system on the vehicle. Background technique [0002] The applicant has applied for the Chinese invention patent application number 200410093222.9 for the invent...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned "multi-channel proportional control valve with load-sensitive dual-pump confluence type multi-channel proportional control valve" patented oil supply to the telescopic and luffing oil cylinder's automatic switching function of single and double pumps makes the internal hydraulic control device of the valve group more complicated. Affects the speed of the outrigger and jib of the crane; secondly, the spring chamber at the left end of the diverter spool only introduces the load pressure through a simple fixed damping hole screw, which is not very ideal for improving the opening and closing characteristics and dynamic stability of the diverter spool action

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