SU66086A1 - Pneumatic or hydraulic piston drive, for example, for chill casting machines - Google Patents

Description

The proposed pneumatic or hydraulic actuator, for example, for chill casting machines, is characterized by the use of an additional piston or diaphragm transmission, which is driven by the same elastic medium as the piston and acts on the actuator stem only on parts of the main piston stroke. This achieves an increase in the force on the rod at the initial moment of its movement. The additional transmission is made in the form of an elastic diaphragm, overlapping, with its annular cavity in the front cover of the cylinder and with the entrances fixed on it a ring with the fingers resting against the beam rigidly fixed on the piston rod.

The drawing shows the proposed drive.

The front cover / cylinder 2 carries a cast iron ring 3, rigidly connected to the cover by means of bolts 4. There is a rubber diaphragm 5 5-6 mm thick between the ring and the cylinder cover.

In the inner cavity of the ring 5 is freely placed steel

ring 6, provided with regular fingers 7..

The cylinder rod is connected at one end to the piston 8, and at the other end carries the beam 9, fastened to it by means of a lock nut W. The end of the rod ends with an // yoke link connected to the machine for the chill casting and fixed by a nut 12. Packed seal 13.

In the extreme (left) position of the piston, the beam raises the adjustable pins and thereby presses the reamer to the rubber diaphragm.

For the stroke of the piston, compressed air or fluid is supplied to the cavity of cylinder A and simultaneously to the annular recess B, formed in the front cover under the rubber diaphragm.

Applying pressure of air or liquid, the diaphragm moves the steel ring 6 on it; By means of the fingers 7, the traverse 9 moves, and, consequently, the brush with the piston bonded to it, thereby conveying the movement to the mechanism of the chill mold. The amount of movement of the traverse under the pressure of the rubber diaphragm is limited to 10 mm. Increasing this stroke is not recommended in order to avoid the danger of a ruptured rubber diaphragm. Since the surface of the latter is larger than the surface of the piston, the force of the initial movement mfoKa is greater than the further force developed by the piston:

The proposed drive is most widely used in chill casting machines, where the initial, very insignificant stroke requires the considerable amount of force required to sever the metal rod or to detach the mold from the casting, which is closely related to the mold due to the linear shrinkage of the alloy.

After the mold or rod has come out of contact with the casting, their movement can be carried out with very little effort.

Prev 1M et and z o b e e n i

Claims (2)

1. A pneumatic or hydraulic piston drive, for example, for chill casting machines, characterized in that, in order to increase the force on the rod at the initial moment of its movement, an additional piston or membrane transmission is used, driven by the same elastic medium and acting on the drive rod only on the part of the stroke of the main piston. 2. The form of the drive according to claim 1, characterized in that the additional transmission is made in the form of an elastic diaphragm covering the annular cavity in the front cylinder cover and the carrier ring with the fingers abutting the beam fixed on the piston pin.