DE3406856A1 - High-pressure long-stroke platen press without press frame - Google Patents

Abstract

A high-pressure platen press with long stroke and self-adjusting press platens, without press frame. In addition to the conventional pressing jobs such as thermoforming, stamping and compression moulding of large surface-area articles, this press is also suitable for fine jobs such as welding in between thermoplastic films, synthetic resin coating and structural embossing. The central part of this press consists of two (or more) press platens having semi-circular reverse sides (Fig. 1, 1 + 2). A high- pressure hose (Fig. 3) or similar expansion body is wound around these press platens. With the inflation of this hose, only the hose circumference or the shape, but not the length, can be changed. These hoses, which necessarily expand inwards, press the two or more press platens together. The reaction forces or supporting forces bear as tensile force on the outer skin of the hose. A press frame and conventional cylinders are dispensed with. <IMAGE>

Description

High-pressure long-stroke platen press without press frame

description r

The invention relates to a long stroke platen press for execution of pressing work on large workpieces.

The invention is based on the object of creating a universally applicable press with relatively high surface pressures, self-adjusting press plates, adjustable stroke - at a fraction of the cost of hydraulic plate presses.

According to the invention, this object is achieved in that two press plates are provided opposite one another with an adjustable distance and with a semicircular rear side. The cavities of these press plates are filled with concrete.

A high pressure hose is wrapped around these press plates. The number of turns determines the stroke, but also the contact pressure.

The outer windings form the outer skin of this system, followed by the inner Hoses or pressing forces are supported, similar to how the steam pressure is supported on the outer wall of the boiler in a boiler. This solution makes a conventional one Press frame unnecessary. The more windings there are under this outer hose, the more space these hoses will fill, i.e. the stroke will be longer and the less the reduction in the contact area can occur, which is why the contact pressure is optimal. This solution makes a conventional piston hydraulic system Λ unnecessary.

Instead of coiled tubes, you can use tires or expanding sleeves, as long as the outer wall of these elements is not stretchable. In the trade, these articles are mostly available as stretch bodies with rubber or synthetic rubber Inner skin and textile, polyester, Kevlar or steel mesh outer skin - available or easy to manufacture.

This press does not need an opening device. According to a preferred embodiment of the invention, the upper press plate is mounted on legs and the lower press plate hangs down, held free by the wrapped expansion elements. With this solution, the press plates are of course self-adjusting. If the upper and lower press plates are accurately guided to each other, ^{">> l} may be those legs used as a guide for the lower plate. Another peculiarity of this press is that it can jpressen with special press plates of 4 pages.

The press can be closed by flooding or emptying the expansion elements or be opened.

■ Air is used as the pressure medium for low pressures and water for higher pressures. Accordingly, an air compressor or a water pump is used as the drive for this press.

The invention is described in more detail in the following exemplary embodiment. The drawings show a semi-schematic representation.

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3 * 06856

Fig. 1 Two press plates with semicircular backs, what according to the invention, the expansion hoses are wound up.

Fig. 2 A section through the finished "wound" press in the open state

FIG. 3 front view of the press according to FIG. 2

Fig. 4 A section through the closed press

FIG. 5 front view of the press according to FIG. 4

Fig. 6 expansion tires that can be pulled over one another

Fig. 7 expansion sleeves

Fig. 8 Fully assembled press with free-standing press plates

Fig. 9 Completely assembled press with guided press plates

Fig. Io A complete press with hydraulic drive

Fig. 11-12-13 show a 4-press plate version for pressing on all sides

14-15 show the press skin changes in various Pressed goods.

Fig. 1 shows the basic principle of this press. The two press plates (Fig. 1-1 + 2) are designed with a semicircular back in order to evenly absorb the pressing forces of the pressure elements pointing towards the center of the system. A possible one Fig. 1-3 shows a pressure element in the form of a pressure hose.

A completely "wound" press in the open state is shown in FIG. 2 and FIG. A preferred type of winding is shown here, which is intended to prevent expansion-related reduction of the contact surface (known from pressure hoses) appear.

FIGS. 4 and 5 show the same press in the closed state. Look at this The illustration shows how far this type of winding is in the expanded printing element state Prevents contact surface reduction.

Possible pressure element arrangement or embodiment is shown in FIGS. 6 and FIG.

A realistic construction of this press is shown in FIG. Fig. shows the press in a guided version.

Fig. Io shows a complete press. The numbered parts are:

1 + 2 = press plates

3 = wound expansion element

4 = frame attached to the upper press plate

5 = electrical flow + shut-off valve ·.

6 = Po! Reversible water pump

7 = water tank

8 = pressure line

Function = pump (6) and valve (5) are coupled. If the pump is running, that's it

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3A06856

Compressed air valve open.

Pressing: Pump pumps water into the expansion hoses. As the hoses can only expand inward, the plates move up the press closed is. The specific pressure of the press is equal to the pump pressure.

When the desired pressure is reached, the pump switches off and valve (5) prevents that the pressure escapes.

Open: The pump is switched on and the polarity is reversed and it sucks. Valve (5) is open. the The press opens due to the weight of the lower press plate (2) and due to the suction effect the pump.

The press described above is a long stroke, precision high pressure press created, the steel content of which requires only approx. In addition to very few moving parts, it generates high overall pressures and provides optimal pressure distribution. Applications for such presses are the Meta.ll plastic and wood industry.

For special purposes, especially for strips and similar molded parts this system can be produced with 4 press plates for pressing on all sides. (Fig. 11-12-13)

All from the description, claims and drawings Features and advantages of the invention, including constructional details and spatial arrangements, can both in themselves and in any Combination be essential to the invention.

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Claims (10)

Claims Long stroke plate press for the execution of pressing work on large areas Workpieces are characterized in that the press plates encompassing, pressurized, expansion elements encompass the press frame substitute. _ 2. Long stroke plate press according to claim 1, characterized in that the relatively movable press plates (Fig. 1, 1 -t- 2) with a Wrapped in expansion elements made of inextensible material (Fig. 1-3), which can only move inwards when pressure is applied. 3. Long stroke plate press according to claim 1 and 2, characterized in that expansion elements encompassing the outer skin of the press plates when pressure is applied Form a solid wall (similar to a boiler wall) on which the developed reaction forces can rely. 4. Long stroke plate press according to claim 1, characterized in that the Stroke of the press with the number of turns of the expansion elements is practical can be enlarged indefinitely. 5. Long stroke plate press according to claim 1, characterized in that the expansion-related Reduction of the pressure area of the expansion elements by arrangement and * number of turns of the elements can be largely eliminated can. ι. ";:.; 6. Long stroke plate press according to claim 1, characterized in that the geometrical outer shape of the press or outer skin of the elements can change with each pressing process - depending on the size of the pressed material - until all "" forces are balanced (Fig. 14-15) . 7. Long stroke plate press according to one of the preceding claims, characterized in that that it can be pressed on all sides with special press plates (Fig. 11, 12-13). 8. Long stroke plate press according to claim 2, characterized in that the lower press plate is freely suspended on the expansion elements, thereby also pressing non-parallel material to be pressed. 9. Long stroke press according to one of the preceding claims, characterized that the upper press plate and legs attached to it equal the load-bearing Press frame result (Fig. 8). 10. Long stroke press according to claim 8 and 9, characterized in that the press legs serve as a precision guide for the press plates (Fig. 9). BAD OR / GINAL · _{: <}