DE755915C - Device for closing or opening multi-daylight presses - Google Patents

Description

Device for closing or opening multi-daylight presses multi-daylight presses of known type, the pressing pressure with the help of one or more Cylinders which are arranged in the lower crosshead of the press frame are generated. That The press is always closed using the one in the lower crosshead stored pressing cylinder either with the help of special lock cylinders or for fast With multi-cylinder presses, close by pressurizing the middle cylinder. The plates themselves are open in a multi-daylight press fixed points on the frame of the press, from which they then go up the piston can be lifted off. The lowest floor is thus closed first, the following one after the other with the piston going up.

This previous way of closing the press has a number of disadvantages. On the one hand, all such presses have a relatively large idle stroke, because the Idle stroke of all floors is added. Because the space between the plates is often a multiple of the thickness of the pressed piece to be produced, so result this results in very large overall heights with a larger number of floors. Too high However, presses are difficult to operate, so the latter has a disadvantage in itself uneconomical Avoid reducing the number of floors must become. With the given height and number of floors, the previous construction method is effective a reduction in the clearance between the floors, which in turn affects the loading the pressing is a disadvantage.

If the idle stroke mentioned is to be overcome quickly, the demands Control when closing particularly expensive, quick-closing valves and Controls.

Should now at the same time when closing, which is also often the case, In the beginning a very slight pressure must be exerted on the material to be pressed the press water generation can be divided into several stages. This will control further involved and awkward.

Especially the fine gradation that starts with very little pressure is necessary, makes difficulties with the previous design.

According to the invention are used to close the press and to generate a low contact pressure or to open pressurized water piston from the main press cylinder completely separate, i.e. working independently and connected to each individual floor and their cylinders sit on the press abutment.

Accordingly, each individual heating plate n, tt is connected to several reciprocating pistons, which are supported in hydraulic cylinders, which in turn are at the top or lower crosshead. An exemplary embodiment is shown in FIG. i.

It is of course also possible to have two or more heating plates at a time to be connected together to an independent pressure piston and thereby with a Printing cylinder to control a group of plates together.

According to the figure, each heating plate is attached to four pistons i., The be guided in cylinders 2. The cylinders 2 are mounted on the upper crosshead 3.

Depending on the desired contact pressure and depending on the load on the individual floors through the pressed material one becomes the lifting cylinder and in this too using the compression pressure.

The control of the cylinders is extremely simple. One has the; possibility to lift each individual plate for itself or all of the plates together to press.

The figure shows an example of a hydraulic drive. Of course you can Instead of the hydraulic pulling elements, mechanically moving pulling elements are also known Use execution.

Furthermore, the figure shows an arrangement in which the lifting and pressing takes place by pulling organs. You can do the same thing by pressing the reach opposite side. In this case, the components required for this would be in the lower crosshead 4. to store.

Through the embodiment according to the invention, all of the above are grounded Disadvantages of the previous designs eliminated and also the following advantages achieved: With the ability to control each individual plate, each individual The plate can be lifted and pressurized immediately after it has been loaded. Through this give the idle stroke of the loaded plate for the next one for the plate below free. The same game is repeated from plate to plate. The idle stroke of the entire This significantly reduces the press; with the same height and with the same Clearance space can accommodate a larger number of floors, or the same Construction height and the same number of floors as before, an increase in clearance can be achieved the latter is particularly important for pressed goods of great strength. This is in Fig. 2 illustrates.

The reduction in the idle stroke also has an advantageous effect Abbreviation of the closing times of the press. In addition, there is controllability of the individual floors of particular value in the case of very sensitive pressed goods that such as B. synthetic resins, begin to change immediately under the influence of heat and are therefore also put under pressure with the use of the temperature influence have to. So far it has been a disadvantage that the whole, mostly already preheated, first The press had to be loaded before the correct printing conditions were set could. According to the invention, the material to be pressed is now independent in each individual floor pressurized from the rest of the floors. The construction described allows one special sensitivity in the control of the individual floors, which in turn for sensitive pressed goods is important.

The individual floors can be heated in a known manner will be sank. When the press is opened, all floors can be relieved at the same time or individual loads can be relieved and lowered, the total weight the plate can be fully utilized with pressed material.

The invention thus allows various possible embodiments, of which, depending on the conditions set, you can choose between them or individually for the type of construction Can make use of.

Claims (1)

PATENT CLAIM. Device for closing or opening multi-daylight presses, in particular for fibrous molded articles in which the levels are located between an abutment and a pressure plate moved by a pressurized water piston, characterized in that independent pressure pistons connected to it are provided for each individual level plate or for groups of plates The cylinders sit on the abutment of the press. To distinguish the subject matter of the invention from the state of the art, the following publications were taken into account in the grant procedure: US Patents No. 1,750,263, 2,094,862.