Classification and principle introduction of the h

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Introduction to the classification and principle of pneumatic motor

pneumatic motor is a device that converts the pressure energy of compressed air into rotating mechanical energy. Its function is equivalent to electric motor or hydraulic motor, that is, output torque to drive the mechanism to rotate

1. The classification and working principle of pneumatic motors increased by 1.35% to 413.5.

the most commonly used pneumatic motors are vane type (also known as sliding vane), piston type and film type

figure a is the working principle diagram of vane pneumatic motor. The compressed air is input from hole a in two ways: one way enters the bottom of the blade through the slots of the sealing covers at both ends of the stator (not shown in the figure), and the blade is pushed out. The blade is closely attached to the inner wall of the stator by the combined action of this pneumatic thrust and the centrifugal force after the rotor rotates. The compressed air passes through the other way and enters the corresponding sealing working space and acts on the two blades. Due to the unequal extension length of the two blades, there is a torque difference, which makes the blades and the rotor rotate in a counterclockwise direction; The gas after work is discharged from hole C on the stator, and the remaining residual gas is discharged through hole C. If the input direction of compressed air is changed (that is, compressed air enters from hole B and discharges from hole a and hole C), the rotation direction of the rotor can be changed

figure B is the working diagram of radial piston pneumatic motor with data output interface saved at the same time. Compressed air enters the distribution valve (also known as the distribution valve) through the air inlet and then enters the cylinder to drive the piston and connecting rod assembly. The importance of stiffness is that it determines the stability of electronic universal testing machine parts during service and then makes the crankshaft rotate. While the crankshaft rotates, it drives the distribution valve fixed on the crankshaft to rotate synchronously, so that the compressed air enters different cylinders with the change of the angle position of the distribution valve, and drives each piston to move in turn. 15. The experiment of the wire change experimental machine is completed, and each piston and connecting rod drive the crankshaft to run continuously. At the same time, the cylinder corresponding to the inlet cylinder is in the exhaust state

figure C is the working principle diagram of thin film pneumatic motor. It is actually a membrane cylinder. When it reciprocates, the ratchet wheel rotates through the pawl at the end of the push rod

2. Advantages and disadvantages of pneumatic motor

compared with the motor with the same function, pneumatic motor is characterized by light shell and convenient transportation; And because its working medium is air, there is no need to worry about causing a fire; When the pneumatic motor is overloaded, it can automatically stop rotating and keep in balance with the supply pressure. Because of the above characteristics, pneumatic motors are widely used in mining machinery and pneumatic tools

compared with hydraulic motor:

1) advantages

(1) safe operation, explosion-proof performance, and free from high temperature and vibration

(2) it can work under full load for a long time, and the temperature rise is small

(3) the power range and speed range are wide, ranging from a few hundred watts to tens of thousands of watts; The speed can be turned up from a few minutes per minute

(4) it has high starting torque and can start with load

(5) simple structure, convenient operation, easy maintenance, low cost

2) disadvantages

(1) poor speed stability

(2) low output power, low efficiency and high gas consumption

(3) high noise, easy to produce vibration

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