RU2330194C1 - Actuator with a piston stroke end indication - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: actuator is designed for automatic control air-operated systems. The said actuator with a piston stroke end indication incorporates a cylinder, a piston with a rod accommodated inside the cylinder to form a head and rod ends, each furnished with an inlet branch. The aforesaid actuator compares favourably with known designs in that it incorporates two jet discrete monostable elements, with the first said element inlet communicating with the rod end inlet branch, while the second one communicates with the head end inlet branch.

EFFECT: simpler design, higher reliability and performances.

1 dwg

Description

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

In the process of pneumatic and hydraulic reciprocating mechanisms, the control of the extreme positions is usually carried out using limit switches (see, for example, “Inkjet logic elements and devices for automatic control of technological equipment.” Industry Catalog. Ed. E.I. Chaplygina, Moscow: VNIITEMR, 1989, p. 47, Fig. 103) or pressure sensors (see, for example. Copyright certificate No. 1180565, class F15B 15/28 "Cylinder with a sensor for extreme positions of the piston", bull. No. 35 from 09/23/85).

Known mechanisms in which the intermediate positions of the executive body are controlled. Monitoring can be carried out using a number of sensors mounted on a moving organ and acting, for example, on a fixed contact (Author's certificate No. 1826637, class F15В 15/28, “Hydraulic cylinder with position indication”, bull. No. 20 from 07.20.95) or with the help of one moving limit switch, on which the stops pre-set in the set positions act (Copyright certificate No. 339907, class G05b 19/44, “Hydraulic software device”, bulletin No. 17 of 01.01.72).

The disadvantage of these devices is their complexity and the ability to obtain information only at points determined by the position of the sensors or stops, and with the increase in the number of controlled intermediate positions of the executive body, the design complexity increases.

Closest to the proposed invention in terms of features is an actuator with sensors for extreme positions of the piston, containing a cylinder and a piston with a rod mounted in the cylinder, with the formation of a piston and rod cavities, each of which has a supply channel (Copyright certificate No. 1386762, class F15B 15/28, "Actuator with a sensor of extreme positions of the piston", bull. No. 13 of 04/07/88).

The disadvantage of this device is its complexity and the ability to obtain information when the piston stops only in extreme positions.

The technical result of the proposed technical solution is to simplify the design and increase reliability, as well as increase functionality.

The specified technical result is achieved in that the actuator with an indication of the end of the piston movement, comprising a cylinder and a piston with a rod installed in the cylinder, with the formation of the rod and piston cavities, each of which has a supply channel, is equipped with two discrete monostable jet elements, the input of the first the discrete monostable inkjet element is connected to the supply channel of the rod cavity, and the input of the second monostable discrete inkjet element is connected to the supply channel scarlet piston cavity. The introduction of a jet discrete monostable element, the input of which is connected to the supply channel of the rod cavity, allows to obtain information when the piston stops in an arbitrary position during the retraction of the piston rod. The introduction of a jet discrete monostable element, the input of which is connected to the supply channel of the piston cavity, allows to obtain information when the piston stops in an arbitrary position during the extension of the piston rod.

The figure shows the actuator with an indication of the end of the movement of the piston.

The actuator with indication of the end of the movement of the piston contains a cylinder 1, a piston 2 with a rod mounted in the cylinder 1 with the formation of the rod cavity 3 and the piston cavity 4. The piston cavity 4 has a supply channel 5, and the rod cavity 3 has a supply channel 6. Supply channel 5 communicates with the input of the jet discrete monostable element 7 having a direct 8 and inverse 9 outputs. The supply channel 6 communicates with the input of the discrete monostable jet element 10 having a direct 11 and 12 inverse outputs.

The actuator with an indication of the end of the movement of the piston operates as follows.

After supplying the medium through the supply channel 5 to the piston cavity 4, the movement of the piston 2 and the extension of the rod will begin. A part of the working medium displaced by the piston 2 from the rod cavity 3, through the inlet channel 6, enters the input of the discrete monostable element 10. As a result, this element will switch and the supply stream from the inverse output 12 will be transferred to direct output 11. When the piston 2 stops in extreme position or in an arbitrary intermediate position, which can be determined by any device that prevents the extension of the piston rod 2, the flow of the working medium into the inlet channel 6 is stopped. The feed stream from the direct output 11 of the jet discrete monostable element 10 is transferred to the inverse output 12.

Thus, after the extension of the piston rod 2, that is, when the piston 2 stops in the extreme or any intermediate position, at the inverse output 12 of the jet discrete monostable element 10, the signal of the zero level changes to a signal of a single level. This information in conjunction with a logical signal for the extension of the piston rod 2 can be used by the control device to form control commands, for example, to change the operation (continuation of the cycle) or return the piston 2 to its original position.

When the supply of the medium through the inlet channel 6 to the rod cavity 3, the movement of the piston 2 and the retraction of the rod will begin. A part of the working medium displaced by the piston 2 from the piston cavity 4, through the inlet channel 5, enters the input of the discrete monostable element 7. As a result, this element will switch and the supply stream from the inverse output 9 will be transferred to direct output 8. When the piston 2 stops, the outflow working environment in the feed channel 5 is terminated. The feed stream from the direct output 8 of the jet discrete monostable element 7 is transferred to the inverse output 9.

Thus, after the retraction of the piston rod 2 at the inverse output 9 of the jet discrete monostable element 7, the signal of the zero level changes to a signal of a single level. This information, together with a logical signal to retract the piston rod 2, can also be used by the control device to form control commands.

The actuator with indication of the end of the movement of the piston has wide functionality. This is due to the fact that after the piston stops, a team is formed for subsequent actions at any piston position and without the use of position sensors. The exclusion of position sensors from the control process simplifies the design and increases reliability. The function of the position sensors in this actuator is performed by discrete monostable inkjet elements.

Claims (1)

An actuator with indication of the end of movement of the piston, comprising a cylinder, a piston with a rod mounted in the cylinder with the formation of a piston and rod cavities, each of which has an inlet channel, characterized in that it is equipped with two discrete monostable jet elements, the input of the first discrete monostable jet the element is connected to the supply channel of the rod cavity, and the input of the second jet discrete monostable element is connected to the supply channel of the piston cavity.