RU92117U1 - PNEUMATIC EXECUTIVE MECHANISM OF RETURN-AND-OFFENDING MOVEMENT - Google Patents

Abstract

A pneumatic actuator for reciprocating movement, comprising a cylinder in which holes are made along its generatrix, a piston with a rod installed in the cylinder to form a piston and rod cavities, a trigger with separate inputs, one of the outputs of which is connected to the rod cavity, and the second output connected to the piston cavity, characterized in that each of the cylinder bores is connected to the corresponding output of the multi-position pneumatic switch, the input of which is connected to the control m input of a discrete monostable element, one of the inputs of a trigger with separate inputs, through which it switches to a state corresponding to the supply of compressed air to the rod cavity, is connected to the inverse output of a discrete monostable element, and a second similar trigger input with separate inputs is connected to the output pneumatic buttons, forming a command for retracting the rod, trigger input with separate inputs, by which it switches to a state corresponding to the supply of compressed air to the piston ev cavity, connected to the output of the pneumatic button, forming a command for the extension of the rod.

Description

The utility model relates to technical means of automation and can be used in pneumatic automatic control systems.

Known pneumatic software devices in which the formation of control signals (commands) is performed using a program carrier made in the form of a punch card and connected to the cylinder rod ("Pneumatics and hydraulics. Drives and control systems". Issue 6. Edited by E.V. Herz , M.: Mechanical Engineering, 1979, p.168).

Known devices in which control signals are generated using a series of sensors mounted on a moving body, and acting, for example, on a fixed contact (Copyright certificate No. 1826637, class F15B 15/28, "hydraulic cylinder with position indication", bull. No. 20 from 07.20.95) or with the help of one moving limit switch, which is affected by stops pre-installed in predetermined positions (Copyright certificate No. 339907, class G05B 19/44, “Hydraulic software device”, Bulletin No. 17 of 01.01.72 )

The closest to the proposed utility model in terms of features is a pneumatic software device containing a cylinder in which holes are made along its generatrix, a piston with a rod installed in the cylinder with the formation of a piston and rod cavities, a trigger with separate inputs, one of the outputs of which is connected to the rod cavity, and the second output is connected to the piston cavity (Patent No. 2350791, class F15B 21/02, “Pneumatic software device”, bull. No. 9 of 03/27/09).

The control circuit of this device is quite complicated.

The technical result of the proposed technical solution is to simplify the design and increase reliability.

The specified technical result is achieved by the fact that in the pneumatic actuator of the reciprocating movement containing a cylinder in which holes are made along its generatrix, a piston with a rod installed in the cylinder with the formation of a piston and rod cavities, a trigger with separate inputs one of the outputs of which is connected with the rod cavity, and the second output is connected to the piston cavity, each of the cylinder bores is connected to the corresponding output of the multi-position pneumatic switch, the input of which is connected to the control input of the jet discrete monostable element, one of the inputs of the trigger with separate inputs, through which it switches to the state corresponding to the supply of compressed air to the rod cavity, is connected to the inverse output of the jet discrete monostable element, and the second similar trigger input with separate inputs connected to the output of the pneumatic button, forming a command to retract the rod, the trigger input with separate inputs, by which it switches to a state corresponding to supplying compressed air to the piston cavity is connected to the output of the pneumatic button, forming a command to extend the rod.

Introduction to the circuit mechanism of a multi-position pneumatic switch, which can be used as a six-position switch of the PPM type (see "Inkjet logic elements and devices for automatic control of technological equipment". Industry catalog. Edited by E.I. Chaplygin, M .: VNIITEMR, 1989, p. 31) and pneumatic buttons, which can be used as pneumatic buttons of the type P1KN.3 (see ibid., P. 30), allows to significantly simplify the control circuit and ensure reliable operation of the mechanism in manual mode.

The drawing shows a pneumatic actuator reciprocating motion.

The mechanism includes a cylinder 1, a piston 2 with a rod installed in the cylinder 1 with the formation of the rod cavity 3 and the piston cavity 4. Each of the holes made along the generatrix of the cylinder 1 is associated with the corresponding output of the multi-position pneumatic switch 5. The input of the switch 5 is connected to the control input of the jet discrete monostable element 6. The inverse output of element 6 is connected to one of the inputs of the trigger with separate inputs 7, by which it switches to the state corresponding to the supply of compressed air into the stock cavity 3. To the second similar input of trigger 7 is connected the output of the pneumatic button 8 ("Back"). To the input of the trigger with separate inputs 7, through which it switches to the state corresponding to the supply of compressed air to the piston cavity 4, the output of the pneumatic button 9 is connected (“Forward”). The output 10 of the trigger with separate inputs 7 is connected to the inlet channel of the piston cavity 4, and the output 11 of the trigger 7 is connected to the inlet channel of the rod cavity 3.

Pneumatic actuator reciprocating movement operates as follows.

First you need to set the switch 5 in the position corresponding to the desired stop position. Suppose piston 2 with a rod needs to be stopped in the i-th position. In this case, the input of the switch 5 is connected to its i-th output (as shown in the drawing).

After applying the supply pressure, overpressure appears at the inverted output of element 6, as a result, the trigger 7 is set to a state in which compressed air enters from the outlet 11 into the rod cavity 3. If the piston 2 was not in the initial state, the rod will retract. Compressed air through the switch 5 from the hole corresponding to the i-th position will go to the control input of the jet discrete monostable element 6. As a result, a signal of zero level is established at the inverse output of the element 6.

After pressing the button 9, the trigger with separate inputs 7 will switch and the compressed air from the output 10 will enter the piston cavity 3. The extension of the rod will begin. The working medium (air) displaced by the piston enters the control input of the jet discrete monostable element 6 and a signal of zero level is stored at the inverse output of this element. When the piston reaches the i-th position at the control input of the jet discrete monostable element 6, a signal of zero level will appear and a signal of a single level will be formed at the inverse output of this element. The trigger with separate inputs 7 will switch and from the output 11 the compressed air will enter the rod cavity 3, and the piston with the rod will begin to move to its original position (retraction of the rod). After the piston leaves the i-th position, a unit level signal will arrive at the control input of the discrete monostable jet element 6, and a zero level signal will be established at the inverse output of this element. The device is ready to be turned on again. If necessary, the command to retract the rod can be formed by pressing the button 8. In this case, the trigger 7 is set to a state corresponding to the supply of compressed air to the rod cavity.

Claims (1)

A pneumatic actuator for reciprocating movement, containing a cylinder in which holes are made along its generatrix, a piston with a rod installed in the cylinder with the formation of a piston and rod cavities, a trigger with separate inputs, one of the outputs of which is connected to the rod cavity, and the second output connected to the piston cavity, characterized in that each of the cylinder bores is connected to the corresponding output of the multi-position pneumatic switch, the input of which is connected to the control m input of a discrete monostable element, one of the inputs of a trigger with separate inputs, through which it switches to a state corresponding to the supply of compressed air to the rod cavity, is connected to the inverse output of a discrete monostable element, and a second similar trigger input with separate inputs is connected to the output pneumatic buttons forming a command to retract the rod, trigger input with separate inputs, by which it switches to a state corresponding to the supply of compressed air to the piston ev cavity, connected to the output of the pneumatic button, forming a command for the extension of the rod.