DE1049669B - - Google Patents

Description

GERMAN

When operating single or multi-roller rubbing machines for rubbing in paints, varnishes ^ pasty masses , creams, KunstetofietLjfe ^
it is € ΓίθΓ ^ € ΉΤ0η7 ^ Ϊ6 ~ Εί6ΤΒΊ3ΰΓΓεηπιϊί to press a relatively high pressure against the rollers; it is also important to press these friction bars tightly against the funnel wall with a laterally arranged pressure device. Mechanical pressure devices, which generally have hand spindles, have been known to date for pressing the bars. But one also knows hydraulic pressure devices in which the pressure medium is conveyed by a pump.

In the case of these pressing devices, it should be borne in mind that it is essential to keep the pressure required in each case constant over a long period of time. On the other hand, it is desirable for the monitoring of the operation and for the repeatability of the favorable pressure values found to be able to carry out an exact pressure measurement. Finally, when the bars are pressed on, it is important that the pressure distribution as uniform as possible, based on the length of the bars, is achieved.

With the help of mechanical, or by means of spindles of the pressure possible without difficulty, if one of the wear and tear z. B. the friction bars and the change in the consistency of the material to be ground. In contrast, it is with these mechanical pressing devices hardly possible and only possible with the use of particularly complicated facilities, a perform reliable pressure measurement.

When using hydraulic pressure devices in which a pressure measurement is readily available is possible, but keeping the pressure constant is often called into question because the hydraulic System, which is necessary for the application of the hydraulic pressure, on the most diverse Places can leak. The slightest loss of the gaseous or liquid pressure medium is conditional immediately a pressure drop, so that you have to have a constantly running pump available that immediately compensates for the loss of pressure medium. Such hydraulic pressure devices with cylinders working pistons require a high level of machining accuracy, especially for these individual parts.

The object of the invention is to provide for single or Mehrwalzenreibmaschinen a pressing device for the pressable against the roll surface Reibbarren which allows keeping constant the respective overall -50 desired pressure in the long period of time, but allows at the same time in a simple manner, a pressure measurement , which can be achieved with simple technical means and which therefore have a one-single or multi-roller reaming machine

Applicant:

Draiswerke
Company with limited liability,
Mannheim-Waldhof

Kaspar Engels, Mannheim-Waldhof, has been named as the inventor

flawless operation of the reaming machine is permitted. A uniform pressure distribution should also be achieved here be possible on the length of the friction bars, using a low specific pressure.

The invention consists in that the pressure medium body for pressing the friction bar than on the The entire length of the billet is designed as an elastic hose that can be operated pneumatically or hydraulically is. With the help of such pneumatically the hydraulically operated elastic hoses or cushions it is possible to keep the pressure constant even for a long time, which is surprising Increase in the quality of the friction product. But at the same time it is also without Difficulty possible to take an exact pressure measurement. Is z. B. on the outer longitudinal edge of a Barrens used such an elastic hose as a pressing means, which is against a corresponding If the abutment is placed, there is a completely even distribution of pressure over the entire length of this bar, a result which in this ideal way would not even be achieved if one Install a large number of hydraulically operated pressing devices distributed over the length of the billet would. The use of these pneumatically or hydraulically operated elastic hoses makes the exact beading of pistons and their cylinders or other guiding devices superfluous. The design of the machine is thus considerably simplified.

In a further embodiment of the invention, it is also proposed that the friction bars be pressed on against the associated hopper wall by means of an intermediate pneumatic or hydraulic to be operated elastic hose, so that the cr-

809 747/279

Claims (4)

1 mentioned advantages can come into their own. Because of this simple design, it is thus possible, without increasing the cost, to have the hoses or pressure cushions to be operated hydraulically or pneumatically work on large areas, whereby low specific pressures in the pressure medium are possible. It is true that a machine with centrifugal disks has become known for refining the paper fibers within an aqueous paper pulp, in which the pulp is driven through between the disks. While one disk is only rotatably mounted, the other disk can only be moved in the axial direction. The last-mentioned disk has a hydraulically or pneumatically operated air cushion with which the gap between the two disks can be adjusted. With this air cushion, however, only a force balance between the fiber pulp, which is driven through between the disks under the action of centrifugal forces, and the force that keeps the disks at a distance is sought. The air cushion in this well-known, but completely different machine and intended for a completely different purpose is neither suitable to achieve a completely uniform pressure of the friction bar lying tightly on the roller butt surface, nor is the air cushion as one over the entire length The friction bar extending intermediate elastic hose can be used with which a uniform contact pressure of the bar is achieved, which is required according to the invention to improve the quality of the friction product. In the drawing, the subject of the invention is explained schematically using an exemplary embodiment. According to the drawing, the funnel 2 is located above the roller 1 in the usual way. On the funnel wall 3, the friction bar 4 is guided on the outside, namely between the funnel wall 3 and the abutment 5, 6 and the bar 4 connected to it Storage of an elastic hose 7 and an elastic hose 8 is provided, which are placed under internal pressure with a gaseous or liquid medium. The two hoses 7 and 8 extend over the entire length of the bar 4. The hose 7 is used to press the bar 4 against the roller 1 with the aid of the pressure medium, while the hose 8 is intended to push the bar 4 against the wall 3 of the funnel 2 to press. Pressure gauges 9 and 10 are connected to the hoses 7 and 8. Numeral 11 denotes the usual skimming plate, which lies against the roller 1, which is set in rotation in the direction of the arrow shown. This use of pneumatically or hydraulically operated hoses or cushions as a pressing device for friction bars is only given as an example in the accompanying drawing. It goes without saying that this arrangement according to the invention can be used in single-roller or multi-roller friction machines of any type. In addition, of course, these cushions or hoses ensure all adjustment variations, such as those offered by hydraulics by means of pistons and piston seals. Patent claims: 1. Single or Menrwalzenreibmaschine with against the roller surface with interposition of a hydraulic pressure medium pressable friction bar, characterized in that the pressure medium body is designed as a pneumatic or hydraulic flexible hose (7, 8) acting on the entire length of the bar (4) . 2. Single or multi-roller grinder according to claim 1, characterized in that the pressure of the friction bar (4) against the associated funnel wall (3) takes place by means of an interposed pneumatically or hydraulically operated elastic hose (8) . Considered publications:
German Patent Nos. 475 791, 883 225;
British Patent Nos. 412,694, 469,747; - / Γ6> · S French patent specification No. 819325; 6>'9 ^ ^x U.S. Patents Nos. 2,156,320, 2,610,801. 1 sheet of drawings