Views: 217 Author: Site Editor Publish Time: 2021-01-17 Origin: Site
Pneumatic transmission and control technology referred to as pneumatic, compressed air as the working medium to carry out energy and signal transmission. It is to achieve a variety of production process, automatic control of a technology as well as an important part of fluid transmission and control discipline.
We use a typical pneumatic drive system to understand how pneumatic systems transmit energy signals and how control automation can be achieved:
We take pneumatic shear as an example to introduce the working principle of pneumatic transmission. The compressed air produced by the air compressor with air compressor hose clamp reaches the reversing valve through the aftercooler, water separator, storage tank, water separator, pressure reducing valve, oil mist device, and part of the gas enters the lower chamber of the reversing valve through the throttling path, making the upper chamber spring compressed. At this time, the reversing valve spool is located at the upper end. And most of the compressed air through the reversing valve into the upper chamber of the cylinder, and the lower chamber of the cylinder through the reversing valve and air communication, so the cylinder piston in the bottom position. When the loading device feeds the quantity into the shear machine and arrives at the specified position, the quantity pressure down stroke valve, at this time, the compressed air of the lower chamber of the reversing valve spool is discharged into the atmosphere through the stroke valve, under the push of the spring, the reversing valve spool moves downward to the lower end; The compressed air enters the lower chamber of the cylinder after passing the reversing valve. The upper chamber is connected with the atmosphere through the reversing valve. The cylinder piston moves upward to drive the scissors to cut the quantity. After the quantity is cut, it is separated from the stroke valve. The valve core of travel valve is reset under the action of spring; And the reversing valve spool up. The piston of the cylinder moves downward and returns to its pre-shear state.
In the pneumatic drive system, according to the different functions of pneumatic components and devices, the pneumatic drive system can be divided into the following four components:
1. Air source device
The air source device converts the mechanical energy provided by the prime motor into the pressure energy of the gas to provide compressed air for the system. It is mainly composed of air compressor, also equipped with storage tank, air source purification equipment and other ancillary equipment.
2.The actuator
ACTS as an energy converter, converting the pressure energy of the compressed air into the mechanical energy of the working device. For the system with vacuum pressure as the power source, we generally use vacuum sucker to complete various suction lifting operations.
3. Control elements
Control elements are used to adjust and control the pressure, flow rate and flow direction of the compressed air, so that the system actuator works in accordance with the functional requirements of the program and performance. There are many types of control elements depending on the completion function. Pneumatic drive system generally includes pressure, flow, direction and logic four kinds of control elements.
4.Auxiliary components
Auxiliary components are all kinds of pneumatic components for internal lubrication, exhaust noise, connection between components and signal conversion, display, amplification, detection, etc. Such as oil mist, muffler, forged pipe fitting and pipe joint, converter, display, sensor, etc.
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