What's the difference between hydraulic and pneumatic?
2.1.2 pneumatic circuit design A. The working procedure diagram of the execution element is proposed by the number of components, the requirements of the work and the process of the cycle. Determine the number of actions per cylinder in a minute based on the speed of the work. B. according to the working procedure of the component, the design of the circuit of the pneumatic circuit is designed according to the basic circuit of the pneumatic circuit. In order to get the most reasonable pneumatic circuit design can be done several legislation comparison, such as gas control, air - electric control, jet control scheme to choose, such as draw pneumatic circuit diagram, using electromagnetic valve, also draw the electrical circuit diagram. 2.1.3 actuator selection and calculation of the pneumatic actuators type generally should be coordinated with the host, the straight line reciprocating movement should choose cylinder, rotary motion should choose pneumatic motor, should choose the swinging cylinder reciprocating swing. The control component selects the valves and pneumatic components manufactured by each manufacturing plant based on the operating pressure of the system or the execution component, and the maximum flow through the valve. Should be considered when choosing all sorts of control valve or logic element features are: 1 working pressure rated flow 2 3 response speed 4 use temperature range 5 minimum working pressure and the minimum control 6 7 air leakage 8 life size and connection form 9 electrical characteristics when selecting control valves, except according to the maximum flow minimum stable flow, should also be considered to ensure that the cylinder stable work.
Part 1, basic knowledge of hydraulic and pneumatic energy device -- -- -- -- -- - device that can convert mechanical energy to the pressure of the fluid, generally refers to is the hydraulic pump, if air is the air compressor. 2, the actuator part -- -- -- -- -- to convert the pressure of the fluid into a mechanical energy device. Part 3, control adjusting device, the pressure of the fluid in the hydraulic system, which can control and adjust flow rate and flow direction is device, such as relief valve, throttle valve, reversing valve, etc. Auxiliary devices - except for the top 3 items, such as fuel tanks, filters, and accumulators. 5, transmission medium - medium of energy transfer. Pneumatic control system design
The composition of pneumatic control system. In the pneumatic control system, the pneumatic generator is usually the air compressor, which converts the mechanical energy supplied by the original motive to the pressure energy of the gas. The pneumatic actuator will convert the pressure to mechanical energy and complete the required action. Between the two parts, according to the requirements of machinery or equipment work cycle movement, according to certain order to various control element (pressure control valve, flow control valves, directional control valve and logic element), auxiliary sensors and pneumatic parts together. Design procedure 2.1 design procedure 2.1.1 to investigate host job requirements, search clear design basis. A. understand the host structure and circulation process, actuators operating force, the movement speed and adjusting range, running smoothness, positioning accuracy and sensor components installation location, signal conversion, interlocking requirements, emergency stop, operating range and degree of automation, etc. B. work environment, such as temperature and range of temperature, humidity, vibration, shock, dust, corrosion, explosion proof, etc. C. Whether to cooperate with electrical or hydraulic system, such as need to know the corresponding installation location, etc. D. other requirements, such as the weight of the gas control device, the size of the shape and the price requirement.
So measures must be taken to remove the residual water. 3 control box to meet the requirements of A certain operation, often will be focused on the control box, A variety of control components to the attention of the control box design points are as follows: A, guarantee the normal work of the line, small resistance loss, the layout is reasonable. B panel and structure arrangement is convenient to consider operation C maintenance, easy to check the beautiful 4 D economy special case processing, when the design should consider the system in a power outage, accident emergency stop and must be driving again interlock protection device and so on, I will not dwell on here, welcome to discuss the treatment experience of! Pneumatic system for environmental protection work, may with the compressed air from the reversing valve discharge into the atmosphere and the exhaust noise and oil fog and air pollution, etc., so we should pay attention to environmental protection.
2.1.5 pneumatic auxiliary parts according to the gas cylinder device for accessory selection: A filter: the implementation of different components and control components for the requirement of the filter in for cylinder, valve, etc 50 ~ 75 u pneumatic motor and 10 ~ 25 u metal with sliding column type, fluidic element u B pressure reducer: according to pressure adjusting range and flow pressure reducer or engraftment of type C oil mist: according to the flow rate and oil mist particle size requirements. Generally 10 square metre air should add lubricants about 1 milliliter. D silencer: the choice of noise according to the workplace. 2.1.6 choice due to the use of compressed air compressor unit load fluctuation is different, so the determination of compressor capacity to fully understand the gas regularity of different users, according to the actual situation, the compressor gas Qg can press type simple estimate Qg = (1.2 ~ 1.5) sum (QZ QO) m3 / min of QZ -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- a machine's gas QO -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- air leakage N machinery and piping
