SU667310A1 - Pneumatic-hydraulic hammer - Google Patents

Description

(54) PNEUMODIZE HYDRAULIC MOLD

I

The invention relates to the field of pressure treatment, more specifically to pneumatic-hydraulic devices intended for pressing parts of bulk materials.

A pneumatic impulse hammer of hydrodynamic punching is known, which contains a pneumatic receiver fixed on a bed, a working cylinder with a movably mounted plunger entering the receiver, a container with an elastic diaphragm whose internal cavity is filled with liquid and separated from the internal cavity of the working cylinder under the plunger by a floating piston, and lifting cylinders 1.

In the known construction, the plunger is reset to its initial position by the container, which in turn is moved by the lifting cylinders.

The prior art device does not allow multiple strokes of the plunger, since it is necessary to lift the container after each stroke.

The prototype of the invention is a pneumatic-hydraulic hammer containing a pneumatic receiver with a working cylinder concentrically located in it, in the wall of which there are windows connecting the cavity of the receiver with the cavity of the working cylinder, in which axially

The displacer is installed, separating the cavity of the working cylinder into the cavity communicating with the cavity of the receiver, and the cavity filled with the working fluid, as well as the unit for draining the working fluid from the cylinder 2.

The well-known pneumohydraulic hammer, in contrast to the known pneumo-impulse hammer by hydrodynamic clamping, allows to perform multiple strikes briskly. However, the disadvantage of the known

pneumohydraulic hammer is a comparative design complexity.

The aim of the invention is to simplify the design. The goal is achieved by the fact that the unit for draining the working fluid from the cylinder is made in the form of an annular chamber located in the case of the receiver with a through hole coaxially with the working cylinder, which is axially displaced relative to the case of the springwell and provided with a drill.

 a volume made on its internal surface on the movement path of the striker, and a facet made at the end of the working cylinder to interacting with the saddle filled in the chamber. The drawing shows the hammer in the initial position.

The moloT contains a pneumatic receiver 2 fixed on the bed 1, the working cylinder 3 with a striker 4 is mounted inside the cylinder head and the axial cylinder 4 is installed. -

In the cylinder 3 there are made through windows 6 connecting the cavity of the receiver 2 with the cavity of the working cylinder above the striker 4 ..

On the inner surface of the working cylinder 3 in the path of movement of the striker 4 there is a shoulder 7, and on the end of the cylinder 3 there is a chamfer 8 in contact with a seat made in an annular chamber 9 located in the housing of the receiver 2.

Pressing bulk materials occurs in the container 10 moved by the hydraulic cylinders 11, with the container cavity communicating with the internal cavity of the working Schlindrai and the chamber cavity through the axial hole 12 made in it. The hammer works as follows. In the cavity of the container 10, in which the shell with the powder is installed, a liquid is supplied from the discharge line, which, after filling the container, the head 4 starts to lift up, which compresses the gas in the receiver 2, and abuts the end of the cylinder 3 at the end of the stroke. In this case, the contact between the chamfer 8 of the cylinder 3 and the seat is broken, and the fluid from the cavity of the working cylinder 3 is forced into the cavity of chamber 9, as a result of which the pressure of the liquid under the die drops and the gas pushed in the cylinder 3 above the shoulder 7 4 down. After the firing pin 4 has fallen below the windows 6, the gas compressed in the receiver 2 with force accelerates the firing pin 4, which at the end of the stroke acts on the fluid in the cavity of the container 10, increasing its pressure to a considerable size, in peiy bfafe which causes uniform pressing of the powder from all sides. Since Ko жидкостьku, the liquid continues to flow from the pressure line into the container cavity, the striker head 4 is raised again.

BUT by this time the working cylinder 3 is already pressed against the saddle of the annular chamber 9 by the gas pressure of the cavity 5.

Thus, during the supply of fluid from the pressure line to the cavity of the container 10, the striker head 4 performs automatic strikes.

After the powder has been pressed, the cavity of the container 10 communicates with the drain, the container 10 is lowered and the ready part is taken out. Installing a new shell with a powder and moving up the container; the next cycle can be carried out. Making the unit for discharging working fluid from a cylinder in the form of an annular chamber with a through hole located coaxially with the working cylinder, and making the cylinder movable in the axial direction allows to simplify the design of the pneumohydraulic hammer.

Claims (2)

1. USSR author's certificate number 398077, cl. B 21 D 26/00, 1971. 2. USSR author's certificate number 193895, cl. B 21 J 7/28, 1966.