SU1442717A1 - Pneumatic drive - Google Patents

Abstract

The invention allows to increase the reliability of the pneumatic actuator. In the housing 1 with the formation of working cavities 2,3, a piston 4 with a double-sided rod 5 is installed. The communication lines 12, 13 of the end chambers 10, 11 of the control are in communication with the cavities 14, 15 of the control of the pneumatic control valve 7. The pushers 16, 17 switches (PC) 8.9 are installed in housing 1 with the ability to interact with piston 4 in its extreme positions. PC 8.9 is made with through axial holes 18.19 for communication of chambers 10, 11 with one of the cavities 2,3. In the lines 12, 13 perpendicular to the axis of the PC 8.9, additional bushes 20, 21 are installed. Pa PC 8,9 made longitudinal flats 22, 23, interacting with the ends of the sleeves 20, 21, to form a flat spool pair. The cavities 14, 15 are connected to the injection line 6. 3 il. S

Description

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. The invention relates to mechanical engineering, in particular to hydraulic actuators, and can be used in machine drives. The purpose of the invention is to improve {reliability of operation.

Fig, 1 shows a diagram of a pneumatic actuator; 2 shows the final switch at the time of interaction with the piston; on fig.Z - section aa in figure 2,

The pneumatic actuator includes a housing 1, in which, with the formation of working cavities 2 and 3, a piston 4 is installed with a double-sided rod 5, an injection line 6, a pneumatically controlled valve 7 and end switches 8 and 9 with end chambers 10 and 11, control lines 12 and 13 the connections of which are communicated with the cavities 14 and 15 of the control of the distributor 7,

Pushers 16 and 17 of switches 8 and 9 are installed in housing 1 with the ability to interact with piston 4 in its extreme positions.

Each end switch 8 or 9 is provided with a through axial bore 18 or 19 to communicate its control chamber 10 or 11 with one of the working cavities 2 or 3.

In lines 12 and 13, perpendicular to the axis of switching of Teley 8 and 9, additional bushings 20 and 21 are installed, and on switches 8 and 9 longitudinal flats 22 and 23 are made, with 24 additional bushings interacting with the ends, forming a flat spool pair.

The cavities 14 and 15 of the channels 25 and 26 are in communication with the injection line 6.

The distributor 7 is provided with a spool 27, interacting with the channels 28 and 29, and the cavity 30 associated with the atmosphere.

Cavities 31 and 32 of switches B and 9 channels 33 and 34 of small cross-section communicate with the atmosphere.

Pneumatic operates as follows.

High-pressure air from the injection line 6 enters channel 3 into cavity 3, and the second cavity 2 is connected to the atmosphere by channel 29 and cavity 30. Distributor 7 remains stationary because the pressure in cavities 14 and 15 is equal to each other, they are connected channels 25 and 26 by line 6 forcing. Piston 4, reach

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15 20

40

55

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the pusher 16 of the switch 8 moves it to the left; a channel opens between the switch 8 and the sleeve 20, which connects the distributor cavity 14 with an end switch 31 of the final switch (FIG. 2), the pressure in the cavity 31 rises as it communicates with the atmosphere of channel 33 small section.

At the same time, the camera 10 of the switch is connected by an opening 18 to the cavity 2, and through channel 29 it has an outlet to the atmosphere, therefore, under the action of a switch

45

50

Because of the pressure in the cavity, the talon moves away from the piston 4 to the left (this is especially important when the movement speed of the power piston 4 is low), the cavity 14 of the distributor 7 is connected through the cavity 31 and the channel 33 (for optimal operation, the cross section of the channel 33 is selected to 1.5 2 times more than the cross section of the channel 25) with the atmosphere, the pressure in the cavity 14 drops and under the action .; the pressure in the other cavity 15, the distributor 7 moves and occupies the leftmost position. Together with the distributor 7, the spool 27, channel 28 and the operating valve are moved. cavity 3 is connected to the atmosphere, and cavity 2 is connected via channel 29 to the injection line 6. The pressure in cavity 2 is higher, the power piston 4 is stirred to the right, the pressure rises in chamber 10, which is connected by hole 18 to cavity 2, switch 8 takes the extreme right position, pressure in cavity 4 becomes equal to cavity pressure 15. Next, the process is repeated continuously.

Claims (1)

Invention Formula . A pneumatic actuator, a housing, in which a double-sided piston is installed with the formation of working cavities, a pressure line, a distributor and end switches with end control chambers, the communication lines of which are connected to the n-1 cavity of the distributor, and the pushers are installed in housing with the ability to interact with the poroshm in its extreme positions, characterized in that, in order to ensure reliable operation,); aiK, ribri, the end switch is made with through1442717 an axial bore for communication of its control chamber with one of the working cavities and provided with an additional bushing installed in the communication line perpendicular to the axis of the switch, at the last (a longitudinal lip, interacting with the end of an additional sleeve to form a flat spool pair, and the control valve cavities are connected directly to the discharge line. 9 games 2 Editor N. Tupitsa Compiled by M.Satyskin Tehred M. Khodanich Proofreader A.Obruchar Order 6366/32 Circulation 652 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4 A-f ( 9e.Z Subscription