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Pneumatic Connection Solutions: Pneumatic Fittings, Pneumatic Push in Fittings and Pneumatic Connectors. |
News From NingBo Pace Pneumatics Co.,Ltd. |
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Immediately this happens the compressed air accumulated in chamber acts on the whole of the piston via the nozzle, causing the piston to move down rapidly due to the high pressure difference of the piston rid. Because of the large thrust produced by this high pressure difference, the piston accelerates rapidly and moves down with an extremely high speed, which develops high shock kinetic energy.
1.2.2 Air motors
Air motors are pneumatic actuators which convert compressed air energy into rotating motion. Based on arrangement, they can be divided into vane type, piston type, gear type, diaphragm type, etc.
1.2.2.1 Operation and characteristics of air motors
(1)Vane motors
This is a simple vane motor operation. The rotor and the vanes are the only moving parts. The rotor is mounted offset in the casing, as can be seen. Air is admitted when the crescent shaped chamber is increasing in volume and delivered when decreasing. Torque is developed by pressure difference on the vanes, driving the rotor to turn in a counter clockwise direction for this motor. The air exhausts through orifices C and B. This direction of the rotor can be changed by merely changing the inlet port, i.e., air is admitted from orifice B for this motor. This is the soft characteristics of a vane motor under a certain working pressure.
Small size motors are used for hand tools such as drills, grinders and screwdrivers. Larger sizes are used for winches, pump drivers, and drive motors on pneumatic drill rigs and general industrial applications.
(2)Radial piston motors
Piston motors operate at much lower speeds than vane motors because of the greater inertia of the reciprocating parts.
The typical radial motor has all connecting rids mounted on a common crank (crank and connecting rod mechanism). The compressed air passes through the distribution valve from the inlet port and then enters the cylinder, driving part of the pistons to move reciprocating. The pistons' reciprocating motion converts into crankshaft rotation through the crank and connecting rod mechanism. The crankshaft then drives the distribution valve which fixed on it to move simultaneously, causing the compressed air to enter different cylinders according to the angle change of distribution valve. The pistons move in turn to develop a continuous crankshaft rotation. At the same time, the cylinder opposite to the inlet cylinders is connected to the atmosphere and the high pressure air is released. The soft feature of the power-speed and the torque-speed characteristic curves of piston motors under different working pressures are also very evident.
(3)Diaphragm motors
Diaphragm motors are basically an application of diaphragm cylinders. The cylinder's reciprocating motion converts into the ratchet wheel's intermittent rotary output pressibility, i.e., the output torque falls off with the increase of intermittent transmission speed under the constant working pressure.
1.2.2.2 Selection and application of air motors
(1)Air motors' selection: The selection of air motors is mainly base on its loaded conditions. In variable load occasions, the speed range and the torque needed to meet working conditions are principally considered. Working speed is also an important factor for constant load occasions. Other factors must be considered except for the above performance-related factors, such as working pressure, gas consumption installation type, etc.
(2)Air motors' application: Air motors find more and more applications as the developing of the productivity. They can be used in all walks of life, particularly applicable for the occasions which require safety-needed, stepless speed changing, frequent direction changing for startup, resistant exploding, and load startup and that easy to be overloaded. They are equally suitable the harsh environment with moisture, high temperature, vibration or that inconvenient to operate directly, such as mine, car manufacturing.
(3)Air motors' lubricating: The working medium of air cannot provide lubrication itself, so additional lubricants are needed in air motors. Proper used and nice lubricating will extend air motors' use life, with the second repair time of 2500 - 3000h or longer. The common way to lubricate is to set an oil mist lubricator before the control valve in the air motor and supply oil in time; the lubricant will enter the system with the compressed air to accomplish lubricating purposed.
1.3 Pneumatic control elements
An important item in a compressed air layout is a regulating valve which ensures the desired pressure, flow rate and direction in the system. |
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