SU1732015A1 - Reciprocating pneumatic drive with automatic reversing - Google Patents

Abstract

The invention relates to mechanical engineering, namely to power devices, providing reciprocating movement and oscillating mode of the output link, and can be used, in particular, as a power drive of a shaker. The aim of the invention is

Description

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Spreading of functional capabilities by operative adjustment of output parameters in the process of work. A reciprocating pneumatic actuator with automatic reversing includes a housing consisting of a working cylinder 1 and a bottom 5, a piston 2 with a hollow LUTOKOM 3, a valve 4 installed inside the piston 2. The working cylinder 1 is connected via a nipple 7 with a channel 9 for supplying the working medium. For removal of the working medium, the channel 10 serves. The rod 3 has several bypass channels 11 connecting the pre-piston cavity 12 and the internal cavity 13 of the rod 3. On the rod 3 is set

table 14 with the object under test 15. This goal is achieved by the fact that in valve 7 a check valve 8 is installed, and in the bottom 5 a shut-off valve 6, the working bodies of valves 4 and 6 are rigidly connected to each other, and throttle gap 16 at the exit from valve 4 and choke 21 at the outlet of valve 6 are adjusted respectively by throttles 19 and 23. The piston throttles 19 are adjusted by a drive mechanism consisting of gear 24 and a screw 25. The throttles 23 are adjusted by a drive mechanism consisting of gear 26 and Worm 27. 1 zp f-ly, 2 ill.

The invention relates to mechanical engineering, namely to power devices, providing reciprocating movement and oscillating mode of the output link, and can be used, in particular, as a power drive of a shaker.

The aim of the invention is to enhance the functionality by operatively adjusting the output parameters during its operation.

Figure 1 shows the described pneumatic drive, a longitudinal section; figure 2 - valve nodes.

A reciprocating pneumatic actuator with automatic reversal contains a working cylinder 1, a piston 2 with a hollow rod 3, a valve 4 installed inside the piston 2 and a 5-gate valve 6 in the bottom. The working cylinder 1 and bottom 5 form the device body. The working cylinder 1 is connected by means of a nozzle 7, having a check valve 8, with a channel 9 for supplying the working medium. For removal of the working medium, channel 10 serves. Stem 3 has several bypass channels 11 connecting the pre-piston cavity 12 and the inner cavity 13 of the stem 3. The stem 14 has a table 14 with the test object 15. medium through the slit 16 through the channels 17 into the cavity 18. The piston choke 19 is designed to adjust the size of the slit 16 and, therefore, to change the output process parameters. The valve 4 is connected to the valve 6 by a rigid connection 20. The valve 6 opens or closes the access of the working medium through the slit 21 to the channels 22. With the help of throttles 23, the size is adjusted

slots 21. Adjusting the piston throttles 19 are produced by a drive mechanism consisting of gear 24 and a worm 25. The adjustments of the pistons 23 are made

a drive mechanism consisting of gear 26 and a screw 27.

Pneumatic operates as follows.

In the initial position, the piston 2 under

the impact of its own weight and the weight of the test object 15 is lowered all the way down. When this valve 4 is open, and the valve 6 is closed. The working medium (gas) comes with a certain pressure through the nozzle 7 with

valve 8 into the pre-piston cavity 12, and then through the bypass channels 11 into the stem 3 and further through the channels 17 into the cavity 18. Since the force acting on the piston 2 from the side of the cavity 18 is greater than

the force acting from the side of the front piston cavity 12 due to the difference in the areas of the front and rear surfaces of the piston 2, the piston starts to move upwards. When piston 2 is moved to a distance determined by adjustment through rigid coupling 20, valve 4, picked up by piston 2, closes and valve 6 opens, allowing gas from cavity 18 to flow through channels 22 into channel 10

removal of the working environment. As it moves, piston 2 loses its speed to a full stop under the influence of backpressure and weight force and begins to move in the opposite direction. When moving the piston

2 over a distance ensuring that there is no impact on the bottom 5, which is determined by the adjustment, the valve 6 is closed, the valve 4 is opened, the pre-piston cavity 12 again communicates with the cavity 18, braking to a complete stop occurs, thus the system returns to its original state. The cycle is then repeated. The frequency and amplitude of this reciprocating movement can be adjusted by means of chokes 19 and 23, which change the flow area of the slits 16 and 21, respectively, and the chokes are driven by gears 24 and 26 with worms 25 and 27. 20 assumes the impossibility of mutual angular displacements of the corresponding worm gears and chokes.

Claims (2)

Claim 1. Pneumatic actuator of reciprocating action with automatic reversing, comprising a housing, a piston with a hollow rod, equipped with a valve, the working body of which is installed with the ability to interact with the housing in 0 five 0 one of the extreme positions, and channels for supplying and discharging the working medium, characterized in that, in order to expand the functionality by operative control of output parameters during operation, a check valve is installed in the channel for supplying the working medium, between the housing cavity and the discharge channel a shut-off valve, the working body of which is rigidly connected to the working body of the valve in the piston, and adjustable chokes are installed at the outlet of the valves in the piston and in the housing. 2. A pneumatic actuator according to claim 1, characterized in that the mechanisms for adjusting the throttles are made in the form of threaded pairs equipped with a rotational drive driven, made in the form of a worm-toothed pair. 23 Faye. 2