RU2351809C2 - Cylinder operation control system - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: proposed system is designed to control the operation of pneumatic and hydraulic cylinders. It comprises a normally-closed pressure pickup with extra throttle and check valve mounted between the hydraulic control valve and cylinder con rod end (idle) chamber. The throttle with check valve are intended for creating pressure head in the cylinder con rod end (idle) chamber that opens the pressure pickup contacts.

EFFECT: simpler design, lower costs, ease of manufacture.

2 dwg

Description

The present invention relates to control systems for the operation of pneumatic or hydraulic actuators (pneumatic or hydraulic cylinders).

A known system for controlling the operation of the cylinder (see Fig. 1), consisting of a distributor with electromagnetic control 1, a throttle with a check valve 2, cylinder 3, on the piston of which permanent magnets are installed, and a magnetic position sensor 4, mounted on the outside of the cylinder [1 ], [2], [3].

The known system works as follows (see figure 1): when switching the distributor 1, compressed air enters through a throttle with a check valve 2, which controls the speed of the rod, into the piston cavity of the cylinder 3, on the piston of which permanent magnets are installed. The piston rod moves to the left, making a working stroke, compressed air from the rod cavity of the cylinder 3 through the distributor 1 enters the atmosphere. On the outside of the cylinder 3, a magnetic position sensor 4 is installed, which is triggered when a piston with permanent magnets approaches it. The magnetic position sensor 4 switches the distributor 1; while compressed air enters the rod cavity of the cylinder 3, the piston-rod of which moves to the right, making idle; compressed air from the piston cavity of the cylinder 3 through the check valve of the throttle 2 and the distributor 1 is released into the atmosphere.

The disadvantages of the known system are as follows:

at least two wires from the control panel must be connected to each magnetic position sensor;

The design of the magnetic position sensor is complex and expensive.

The essence of the invention lies in the fact that the proposed control system for the operation of the cylinder, consisting of a valve with electromagnetic control and a throttle with a check valve installed between the valve and the piston (working) cavity of the cylinder, differs in that between the valve and the rod (idle) cavity of the cylinder is installed normally closed pressure sensor and additional throttle with check valve.

A throttle with a non-return valve is necessary to create pressure in the rod (idle) cavity of the cylinder, which opens the contacts of the pressure sensor.

Figure 2 shows the pneumatic diagram of the proposed control system of the cylinder.

The proposed system consists of a solenoid valve 1, a throttle with a check valve 2, a cylinder 3, a throttle with a check valve 5 and a pressure sensor 6.

The proposed system works as follows: when switching the distributor 1, compressed air enters through a throttle with a check valve 2 that controls the speed of the rod, into the piston cavity of the cylinder 3. The piston rod moves to the left, making a stroke; compressed air from the rod cavity of the cylinder 3 enters the throttle with a check valve 5 and a normally closed pressure sensor 6; from the throttle 5, compressed air through the distributor 1 enters the atmosphere. The throttle 5 creates in the rod cavity the pressure support necessary to open the contacts of the pressure sensor 6. At the end of the stroke or when the rod stops at any place in the stroke, the pressure in the rod cavity disappears; while the contacts of the pressure sensor 6 are closed and switch the distributor 1. Compressed air through the distributor 1 and the check valve of the throttle 5 enters the rod cavity of the cylinder 3; the cylinder rod moves to the right, idling; compressed air from the piston cavity of the cylinder 3 through the check valve of the throttle 2 and the distributor 1 is released into the atmosphere.

To control the operation of the pressure sensor 6, only one wire is needed, and the sensor housing is connected to the "mass". As a pressure sensor, an automobile pressure sensor is used, which is installed in the engine. This sensor is simpler in design and cheaper than the magnetic position sensor used in the prototype. Since the pressure sensor is installed on the pneumatic panel next to the electric control panel, the length of the wire connecting the sensor to the electric panel is minimal and does not depend on the installation location of the executive cylinder.

When using the proposed cylinder control system, technical results are achieved by simplifying, reducing the cost of the design, reducing the complexity of manufacturing.

The proposed cylinder operation control system is implemented in the design of an automatic double-disc saw developed by NPK PO CJSC and is successfully operating.

Information sources

1. Pneumatic devices and systems in mechanical engineering. Directory. M .: Engineering, 1981. 23 p.

2. Patent No. 2047011, 10.27.1995.

3. Patent No. 2176340, November 27, 2001

Claims (1)

A cylinder operation control system consisting of a solenoid valve and a throttle with a check valve installed between the distributor and the piston (working) cylinder cavity, characterized in that a normally closed pressure sensor and an additional throttle are installed between the distributor and the rod (idle) cylinder cavity check valve.

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