DE174522C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 49 e. GROUP

Addendum to patent 130951 of January 8, 1898.

Patented in the German Empire on December 2, 1902. Longest duration: January 7, 1913.

For hydraulic presses with pressure intensifiers according to patent 130951 it is for smaller ones Presses, especially for those where the press needs to work quickly Value, with a small stroke caused by the booster piston, a fast one and easy adjustment of the stroke to be able to effect, as well as a squat as possible To have the arrangement of the individual working bodies of the press.

For this purpose, the present innovation is the arrangement of individual working bodies of the main patent takes place in a new special way.

The second pressure intensifier mentioned in patent claim 2 of the main patent is chosen so large here that the pressure cylinder of the same is able to absorb all of the water (or similar pressure fluid) displaced by the main pressure intensifier and the plunger during the largest total stroke, without it being the special open or closed reservoir k from the main patent (the arrangement of which is indicated in dotted lines). It is also not necessary to connect the retraction cylinder to this ₍ -j second pressure intensifier; rather, the retraction can be effected by a special power source, e.g. by steam Retraction piston a one-sided attack of the same on the plunger is provided in that the piston rod s of the retraction piston i is moved from the center of the same towards the circumference closer to the plunger b Reduced minimum size.

In Fig. I, b denotes the plunger, c the booster piston and d the associated steam cylinder of the pressure booster in the arrangement known from the main patent 130951. 0 is the check valve, which closes the high pressure from the control of the second pressure booster g operated by lever η. The retraction is effected by the piston i , the lower surface of which is under constant pressure. The rod s engages this piston on one side, and this again engages on one side through the crosshead / on the plunger b , which is essential for the compact structure of the press.

The movement of the steam valve m for the steam cylinder of the second pressure booster is interdependent with that of the check valve 0 and that of the controller h, in that all three controllers can be operated by a single lever η . The connection of this lever with the individual controls can either be mechanical, which is effected by rods, ropes, etc., or the movement of the controls, their mode of operation, can take place through hydraulic or electrical transmission

in relation to the operation of the press:

The booster and the plunger, as well as the retraction piston and the control take the position shown in Fig. Ι in the rest position; the retraction piston can follow the movement of the plunger. Of the . Pressure intensifier d regulates the simple, constant strokes.

ίο If the ram b is now to be particularly advanced with the help of the second pressure booster, the steam valve m of the second pressure booster is opened for live steam, with the controller h opening the connection between this second booster and the press cylinder at the same time. The steam entering the second pressure booster steam cylinder r presses the water quantum into its

associated booster cylinder g and drives the same when the control h is open through the self-opening check valve 0 into the press cylinder b. The pressing fluid coming from the booster cylinder has so much pressing pressure that the pressure exerted on the pressing piston b surely overcomes the counter pressure of the retraction piston. At the same time, this pressure also drives the booster piston c upwards to its highest position.

The downward movement of the plunger, however, can be inhibited at any moment by turning off the pressing pressure from the pressing cylinder by moving the control lever η accordingly. Fig. 2 shows the position of the steam valve m, the check valve ο and the hydraulic control h during the filling of the press cylinder b, Fig. 3, however, the position during the emptying of the cylinder b with the decrease of the second booster steam piston r.

The actual work with the press then begins, in that the first booster piston c is activated. After each forward stroke, due to the action of the retraction piston i , which is entrained during the action of the plunger and thereby pressurized, on the plunger, its accelerated decline takes place, whereby due to the shut off hydraulic pressure in the plunger the immediate return of the booster piston c to the starting position takes place and that Game can be repeated. The plunger now goes back into the specific starting position caused by this pressure, which can be easily regulated with the aid of the second pressure booster after each stroke.

If the plunger b is to be withdrawn into another position, the steam valve m is opened for exhaust steam; the control h is again opened, at the same time the check valve 0 is mechanically raised, ie opened (FIG. 3). The pressure acting on the retraction piston is now high enough not only to bring the booster piston c to its highest position by pushing back the plunger b , but it is also able, by displacing water from the press cylinder to the booster cylinder g of the second pressure booster, to push back the second booster piston, as far as this is required by the respective desired position of the compression head q .

In the rest position of the lever η , the check valve c is closed and valve m ö and control 7f are in the middle position. ■

This can make lifting the steam piston of the second pressure booster even easier that under the same steam which is, if necessary, adjusted to low pressure by a reduction valve, admitted will.

Claims (3)

85 patent claims: 1. Hydraulic press with pressure booster according to patent 13Ό951, characterized in that instead of the entire second pressure booster (G), according to claim 2 of the main patent, a pressure booster apparatus (gr) occurs, which is controlled by a control (h) with the press cylinder (b ) connected booster cylinder (r) is sufficient for the storage of all the hydraulic fluid that is displaced from the press cylinder (b) when the entire stroke is completed. 2. Embodiment of the press according to claim 1, characterized in that for the purpose of accelerated movement of the liquid between the press cylinder and the second pressure intensifier, the connection between the retraction cylinder and the second pressure intensifier is canceled and the retraction is effected by a special power source (piston i) ' 3. Embodiment of the press according to claim 1 and 2, characterized in that only one retraction piston (i) is provided, the retraction piston rod fs) is set after the edge of the piston (i) , around the in this one-sided arrangement on the plunger (b ) to reduce the acting bending moment by shortening the lever arm. 1 sheet of drawings.