DE1949066A1 - Press with filling pusher - Google Patents

Description

1949056

LAEIS works September 25, 1969

Aktiengesellschaft BL 85 - B / Schi

55 T r i e r ■ '

Ostallee 3/5

Press with filling slide

The invention relates to a hydraulic press for ceramic products, e.g. B. plates or stones, with over the shape moving filling slide. In such presses, the press stroke in the first part is carried out with pressurized water of about 50 atm until it is placed on the material to be pressed (idle stroke). In order to · the idle stroke distance can be traversed as quickly as possible, ßind the cross-sections of the supply lines and the passages to be dimensioned accordingly large in the valve blocks. Furthermore, one looks for the. Keep the idle stroke as small as possible. To this end the ram is made detachable from the press plate and extended to the extent that it is moved over the mold Filling slide can move sideways. This requires the formation of the ram as a carriage or slide with the appropriate drive for it as well as a not \ insignificant expenditure on operating resources, i.e. hydraulic fluid. '.. ■ -

In addition, there is a correspondingly large storage tank in the pressurized water center for the delivery of pressurized fluid of approx 50 atü voltage for the ram displacement, for the back stroke and for the idle stroke, designed accordingly to operate several presses as a central station.

Fig. 1 shows a common design of such presses. In the press cylinder 1, the press piston 2 is movable, and the press plate j3 is located at its lower end. The press ram 4, which can be extended to the side with rollers 5 on the roadway 6, is located below this. In the press table 7 there is the press mold 8, via which the filling slide 9 can be displaced for transporting the material to be pressed and for filling the mold 8. _{1098U / 1261}

BL 85 - B / Sclil · -2- 25.9-69

The return stroke of the plunger 2 is carried out by the cylinder 10 with the piston 11, which is connected to the platen 3 via the cross member 12 and the tie rods 1-3. During the pressing stroke, the cylinder 1 receives through the line 15 from the valve block 16 first corset pressure of about 50 atu, through which the punch 4 moves down to the material to be pressed in the mold 8. Then, as usual, high-pressure fluid is added and the pressing is carried out. The return stroke cylinder - receives constant pressure via line IJ. He pushes the liquid out of the cylinder 1 back into the return line, the resistance of which must be overcome, which is generally within the limits of 4 to 7 atmospheres, depending on the length up to the central power water station. ; - "

In this known mode of operation, the punch 4 needs only to be lifted to the distance Al, on the other hand it must however be mobile, v-as one or more Requires hydraulic drive cylinder for the ram carriage. They are in the drawing for clarity not shown for the sake of

The invention specifies a way on which both the structural complexity and, above all, the liquid and energy consumption Much can be reduced. Do that new invention is the ram in operation firmly with the Press plate connected, so not extendable and viird in Idle stroke raised to above the height of the filling slide. This means that the upper stacks can be moved into the ;; Shape guaranteed. ·:

The idle stroke is greater than in the known version.

According to the invention, the press cylinder is switched on during the return stroke one placed in the immediate vicinity of the press, with Connected to it by a short cable connected storage unit, which during the empty or Rüokhub a sum pre-filling of the Press cylinder with pre-charge specific amount of liquid

109814 / 12Bt

BL 85 - -B / Sehi - 5 - _ 25'.9 69

records. The energy to convert the idle stroke amount into As before, the return cylinder provides the idle stroke memory. However, the energy is no longer used to overcome the resistance applied in the return line and is no longer lost; but is used to recharge the memory and. during the following press stroke by pre-filling under pre-filling pressure recovered for the most part. The slightly enlarged Idle stroke of the press cylinder over the filling slide in addition, it is more than compensated for.

By pushing back the storage fluid, which is tensioned to 4 atmospheres as a pre-filling liquid in the cylinder and at the same time as the weight effect of the pre-piston becomes' an accelerated Get down gear on the press stroke. Only when the press ram is placed on the material to be pressed is in the form Hydraulic fluid switched on as a pre-pressure and then high pressure fluid for final pressing.

It is particularly useful to start the Leerhubspeieher straight away to grow the face; thus the shortest V.'ege are between P-eJ3 cylinder and memory given. The extremely short pipeline because of its shortness it can have a large cross-section, so that its resistance. can be neglected.

3in the new training of the press and the one described The Verfahrbarkei'G of the rnic rnic is priced in experience the corresponding track and drive saved, so that c. this Part of the press becomes much easier. The Leitiu · _._ :. with a large cross-section, previously used as a connection between Valve block and press cylinder are now used. a no longer disturbing minimum reduced. The valve block becomes smaller because the control of the connection between Press cylinder and idle stroke reservoir through a valve on the press cylinder is controlled. This allows the valve block unit, which controls the entire press, correspondingly smaller and more handy to ground. -.

109814/1251

BL 85 - B / Schi- - 4 - ■■■.: '■ ■■■ ;; ■ 25-9-69

But above all, hydraulic fluid is saved because the .-, - ■ total idle stroke quantity essentially only between the -press- cylinder and the idle stroke memory plays. Is accordingly. " 'also relieves the head office. With: the remaining preload, can after placing on the mold the loose molding compound can also be pre-pressed very far. This also works - depending on the filling level, it has a favorable effect on the press water consumption and thus the economy of the machine. *. ■ ■ ■ -

The overhead of the relatively small memory and of the valve "for this falls compared to the described · - ■ Benefits do not matter.

Domestic the drawing, the new design of the press 1st in Fig .. 2 shown ,, with substantially the same designations are used as in FIG. '''Ig. 1. The idle stroke of the CeGi with the press plate 3 Jw operation; connected ram s 4 assumes the Au.smal.1 A 2, so it is larger air; in the known design. When the idle stroke is released in the retraction of the pressure piston 2, the return stroke cylinder 10 receives low pressure as before, through the control block 16 and the line 17.

The withdrawal movement initiated by him pushes the content of the press cylinder 1 through the valve 25 and the short line 21 in the idle stroke store 22. The excess energy arrives Via the overflow valve 23 into the return 20.

During the press stroke, the storage liquid is pressed back from the memory via the short line 21 into the press cylinder 1 / until the press ram is placed on the molding compound. The cylinder 1 then receives pressurized water from the valve block 16 as usual. The valve 25 can be controlled from the valve block 16 via a line 26 and the cylinder 27. The high pressure liquid is introduced through the line 28, which can have a relatively small diameter because only high pressure liquid has to be conveyed for it, but not the liquid of about 4-7 atU required to measure the idle stroke. ή09 KW / ^ Z 51

BATH ORIGINAL

BL 85 - B / Ski - 5 - 25.9.69

Since the idle stroke liquid quantities to be stored according to the invention are quite limited, the idle stroke memory be built as a pressure bladder accumulator., as a pressure oil accumulator is often used for higher pressures in presses. It can be attached to the press without hers Significantly impair accessibility.

To supplement it is in Pig. _; 2 shows the medium-pressure water generation system (e.g., 50 atU.) With pump 30 * medium-pressure accumulator 31 * water tank 32 * return line 20 as well as suction line 33 , discharge line 34 and medium-pressure line 35.

At 36 on the control block 16 is the high pressure line or a Multiplier connected.

10-98 U / 12B1

Claims (10)

LAEIS-Werke 6 September 10, 1969 üö "Aktiengesellschaft BL 85 - B / Schi T r i e r '· .- Ostallee 3/5 patent claims 1. Hydraulic press for ceramic products, In particular stone or plate press, with over the Shape movable filling slide, characterized, that the ram (4) is firmly attached to the press plate (3) connected, so not extendable and up to the height of the filling slide (9) can be raised (idle stroke A 2) and the press cylinder (1) to one in the immediate vicinity Close to the press arranged memory (idle stroke storage 22) can be connected, the one during the idle or return stroke absorbs a certain amount of liquid to pre-fill the press cylinder at pre-charge pressure (up to about 10 atU). 2. Press according to claim 1,
characterized, that the idle stroke accumulator (22) is attached to the press. 3. Press according to claims 1 and 2, marked by an Leerhubspeioher (22) mlt elastic partition (Pressure bladder accumulator). 4. Press according to claims 1 to 3 » marked by a valve (25) attached to the prease cylinder (1) for controlling the short line (21), to the idle stroke accumulator (22) and to the high pressure line (28) _K 1098 14/1251 BL 85 - B / Schi ^ - 8r- Method for controlling hydraulic presses for ceramic products with a filling slide that can be moved over the mold and a press ram that can be raised above the height of the filling slide,
characterized in that - that the ram for the return stroke to. Priming during the press stroke a certain amount of liquid of about a pressure corresponding to the resistance in the normal return line (up to 10 atmospheres) into one with a short line near the press attached memory and at the beginning of the press stroke again from the memory is removed for priming. 109814/1251