Multifunctional working bucket electro-hydraulic leveling valve group

Abstract

The invention discloses a multifunctional working bucket electro-hydraulic leveling valve group. The working bucket electro-hydraulic leveling valve group communicates with the V1 end and the V2 end of a first balance valve and the V1 end and the V2 end of a second balance valve. The C1 end and the C2 end of the first balance valve communicate with two end openings of a leveling oil cylinder. TheC1 end and the C2 end of the second balance valve communicate with two end openings of a swing oil cylinder. Load self compensation two-position three-way electronic proportional valves directly complete pressure load sensitive compensation control. The two two-position three-way electronic proportional valves are combined to control the direction and speed of the leveling oil cylinder. Rated flowof two valve cores are arranged asymmetrically to easily achieve small-flow high-resolution flow precision control of the leveling oil cylinder of asymmetric compression areas. An unloading electronic proportional valve and a one-way return throttle valve are combined to control the swing speed of a working bucket to realize small flow micro-control, and meanwhile, the swing speed ratio of the working bucket is adjustable. A one-way backflow valve isolates pressure impact caused by rapid emergency unloading of the unloading electronic proportional valve.

Description

technical field [0001] The invention relates to a multifunctional working bucket electro-hydraulic leveling valve group, which belongs to the field of hydraulic technology, and is suitable for working bucket lifting boom type engineering machinery, especially for high-altitude operation vehicles. Background technique [0002] Aerial work vehicle is a typical working bucket lifting operation device, and the working bucket leveling system is safe, reliable, fast and stable is its core requirement. At present, the typical working bucket leveling system is divided into three types: mechanical leveling, hydrostatic leveling and electro-hydraulic control leveling. [0003] Mechanical leveling generally uses pull rod mechanical leveling or chain mechanism leveling. The mechanical leveling structure is complex, and it is mostly used for folding arm aerial work vehicles. The heavy weight of the mechanical leveling mechanism reduces the operating range of the raised boom. [0004] T...

AI Technical Summary

Problems solved by technology

[0009] This solution has the following disadvantages: the flow pressure control of the speed control valve takes time to respond and the pressure shock is caused by the vibration of the valve core, which makes the leveling angle of the working bucket easy to exceed the limit and emergency stop when the boom is started, which reduces the rapidity of the leveling cylinder response and stability, thereby affecting the safety and reliability of the bucket operation;

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