SU1206503A1 - Pneumatic actuator - Google Patents

Description

h. 1206503

This invention relates to

ra 46

digging and can be used in machines and mechanisms with stringent requirements for precise positioning.

The aim of the invention is to improve the positioning accuracy of an actuating cylinder.

The drawing shows a pneumatic actuator ..

The pneumatic actuator contains an actuating cylinder 1 with a rod 2 and piston 3 cavities, a block 4 of valves, 5 and 6 discharge lines with pressure regulators 7 and 8, a pulse generator 9, a pulse counter 10, electrically controlled valves 11 and 12, measuring tanks 13 and 14, pneumatic control valves 15 and 16, the control cavities 17 and 18 are connected to the pulse counter 10 via electric control valves 11 and 12, and outputs 19 and 20 of pneumatic control valves 15 and 16 are connected to the measuring tanks 13 and 14.

A pulse counter 10 is in communication with a pulse generator 9 and through it with a pumping line - 5.

The emergency device 21 contains an emergency tank 22 and control valves 23 and 24, the control cavities 25 and 26 are connected to the pressure line 5, the rod cavity 2 of the cylinder 1 is communicated through the control valve 23 with the emergency capacity 22, and the piston cavity 3 of the cylinder 1 is communicated through control valve 24 with atmosphere.

The pulse generator 9 is designed as a controllable reversing distributor 27, lines 28 and 29. the control of which is provided with pneumatic relays 30 and 31, and input 32 is connected via distributor 33 to the discharge line 5. Pulse counter 10 is made in the form of metering tanks 34 and 35 of the outlet distributor 36 of the pneumatically controlled metering distributor 37, the outlets 38 and 39 of which are connected to the metering tanks 34 and 35 and through the outlet valve 36 with the atmosphere.

The pneumatic actuator is equipped with check valves 40-42 and pressure gauge 43.

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The distributor block 4 comprises distributors 44 and 45 with control cavities 46 to 49.

The pneumatic actuator is equipped with an air preparation unit 50 and filters 51 and 52.

Pneumatic operates as follows.

At the initial moment of time, air from air preparation unit 50 enters the rod 2 and piston 3 cavities of cylinder 1. Due to the different adjustment of pressure regulators 7 and 8, cylinder 1 is in equilibrium.

The step of moving the cylinder 1 is determined by the measuring capacitances 13 and 14. The number of steps of the cylinder 1 is set on the counter-10 pulses. The volumes of the metering containers 34 and 35 are related as 1:10 .. At each pulse, air enters the metering container 35 from the metering container 34; The pressure increment for each cycle is recorded by a pressure gauge 43, the signal from which, during the execution of the cycles, arrives at the opening of the outlet distributor. Having thus defined the number of pulses, switch on an electrically controlled valve 11, which switches the pneumatically controlled valve 15, thereby connecting the rod cavity 2 of the cylinder 1 to the measuring capacity 13. The cylinder 1 moves to the left (according to the drawing) until a new equilibrium state is reached.

When the distributors 11 and 33 are turned on, the controlled reversing valve 27 is periodically switched, and each time (for two switches) air is supplied to the dosing capacity 35 of the pulse counter 10, and from measuring capacity 13 it is released into the atmosphere.

Similarly, the pneumatic actuator operates during the reverse course by switching on the distributors 12 and 33.

In case of emergency situations (pressure drop in lines 5 and 6 of discharge), emergency device 21 is activated and air is supplied from emergency vessel 22 to rod 2 of cylinder 1 and installed in primary. initial position.

86 52 5/33 2ff ff 72 29

Claims (4)

1 . Pneumatic drive, comprising slave cylinder with a rod and the piston cavities, the block valves, two discharge line with a pressure regulator communicated through valves block the cylinder cavities of difference ga me ayuschy with I that, with ^- in order to increase the accuracy of the positioning actuator cylinder actuator is provided with a counter impulses; a pulse generator, two electrically controlled distributors, two measured containers and two pneumatically controlled distributors, the control cavities of which are communicated with a pulse counter through electrically controlled distributors, and the outputs of pneumatically controlled distributors are connected to measured capacitors, while the pulse counter is communicated with and through the pulse generator from one of the lines injection. 2. The pneumatic actuator according to claim 1, characterized in that it is equipped with an emergency device made in the form of an emergency tank and two controlled valves, control cavities of which are connected to one of the discharge lines, the rod cavity of the actuating cylinder is communicated through one of the controlled valves with an emergency capacity, and the piston cavity of the actuating cylinder is communicated through another controlled distributor to the atmosphere. 3. The pneumatic actuator according to claim 1. due to the fact that the pulse generator is made in the form of a controlled reversible distributor, each control line of which is equipped with a pneumatic time switch, and the input is connected to one of the discharge lines. 4. The pneumatic actuator according to claim 1, characterized in that the pulse counter is made in the form of metering tanks, an outlet distribution. a die and a pneumatically controlled metering valve, the outputs of which are in communication with the metering tanks and through the outlet valve with the atmosphere. SU „1206503 1206503 2