Engineering machinery electro-hydraulic proportional type and form of pneumatic valve

electro-hydraulic proportional pneumatic valve including rate flow pneumatic valve, pneumatic valve, pressure proportional reversing pneumatic valve linear vibrating screen. According to the characteristics of the engineering machinery hydraulic operation, in the form of structure electrohydraulic proportional pneumatic valve are mainly divided into two kinds: one kind is spiral cartridge proportional pneumatic valve ( screwincartridgeproportionalvalve) Pneumatic valve type, another kind is slip ratio pneumatic valve ( spoolproportionalvalve) 。

slide pneumatic valve type pneumatic valve, pneumatic valve is also called distribution proportion is one of the most basic element of mobile machinery hydraulic system, is to realize the direction and flow control of compound jaw crusher broken stone machine pneumatic valve. Pneumatic valve type electro-hydraulic sliding ratio multi-channel pneumatic valve is ideal electro-hydraulic conversion control element, it not only retains the multi-channel, the basic function of the pneumatic valve manually, also increase the proportion of electricity feedback servo operation and load the position sensor and other advanced means of control. So it is the upgrading production of pneumatic valve engineering machinery distribution sand equipment.

for manufacturing costs and the characteristics of engineering machinery control accuracy is not high, the proportion in the multi-channel pneumatic valve generally not configuration displacement sensor, also do not have electronic detection and error correction function. So, pneumatic valve core displacement easily influenced by load changes caused by pressure fluctuations, want to rely on visual observation in the process of operation to ensure operation complete roller crusher. In the electronic control, remote control operation more should pay attention to the influence of outside interference. Recently, due to the development of electronic technology, people are increasingly using built-in differential transformer ( ＬＤＶＴ） Such as displacement sensor constitute a pneumatic valve core position detection, realize the pneumatic valve core displacement closed loop control. The proportion by electromagnetic pneumatic valve and position feedback sensor, power amplifier and other electronic circuit composed of a highly integrated the proportion of pneumatic valve, have certain correction function, proportion of general pneumatic valve can effectively overcome the shortcomings, improve obviously the control precision.

electrohydraulic proportional multi-way pneumatic valve of load sensing and pressure compensation technology

in order to save energy and reduce oil modestly higher control precision, but also make the synchronous action of several components of noninterference in movement, more advanced construction machinery are adopted, the load sensing and pressure compensation technology. Load sensing and pressure compensation is a very similar concepts, are using load changes caused by the pressure to adjust the pressure and flow of pump or pneumatic valve to meet the job requirements of the system. Load sensor for quantitative pump system is to load pressure, through the load sensing hydraulic system lead to the overflow of the remote relief on the pneumatic valve, when the load is small, the overflow pneumatic valve set pressure is small; Load is bigger, constant pressure.