FI59947B - MOTTRYCKSANORDNING FOER SKRUVPRESSAR - Google Patents

Description

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Patent and registration authorities Amttktn utlagd och utl. »Krift ·» publtcend 31.07 · 81. (32) (33) (31) The requested «tuolk # ui — fl« glrd prloritet 27.11-73

Norway-Norway (NO) 1518/73 (71) Thune-Eureka A / S, Drammensveien 130, Oslo 2, Norway-Norway (NO) (72) Erlend Eikenes, Oslo, Norway-Norway (NO) (7l) Berggren Oy Ab (5I) Back pressure device for screw presses - Mottrycksanordning för skruvpressar

The screw clamp is basically formed by a screw placed inside the clamping jacket. The material to be pressed is fed to the beginning of the screw press and leaves the other end of the press, the so-called the outlet end. The desired compression effect is achieved by increasing the diameter of the screw in the direction of material transport or possibly by reducing the diameter of the compression sheath while keeping the diameter of the screw constant. Near the discharge port, there is usually a back pressure device, i.e. a device which causes an increase in pressure at the discharge end of the press. The pressure increase is usually achieved by reducing the cross-sectional area of the outlet, whereby local compaction of the substance takes place and a corresponding pressure increase takes place at the outlet end of the press.

The present invention relates to a back pressure device for screw presses for removing water from masses comprising a plurality of pressurized flaps arranged to rotate radially in a radially plane around the circumference of the press outlet, and it is an object of the invention to provide a back pressure device which reduces the cross-section of the outlet.

2 59947

The invention is characterized in that the flaps are arranged on a common, annular bellows member connected to a pressure source. With such a back pressure device, the desired reduction in the cross-sectional area of the outlet can be achieved by adjusting the pressure prevailing in the bellows member according to the operating conditions. In addition, the great advantage is achieved that when the same force is applied to the flaps, the private flaps can turn outwards, which is important, for example, in the presence of hard lumps. The replacement of spent flaps can also be performed in a simple manner. In addition, it is possible to replace all flaps with flaps of a different size or shape. Thus, such a counterpressure device is largely controllable and applicable.

A back pressure device with a plurality of pressurized flaps, each of which is acted upon by its own operating cylinder, is already known, e.g. from U.S. Pat. No. 3,533,510. However, such back pressure devices do not provide the above-mentioned power provided by the back pressure device according to the invention, in which the flaps are arranged on a common annular bellows member connected to the pressure source.

The invention will be explained in more detail below with reference to the drawing, in which: Fig. 1 shows a screw press seen from the side and partially blown, Fig. 2 shows a back pressure device seen towards the screw press, Fig. 3 shows a section of the back pressure device in an enlarged dimension. in the formula.

Figure 1 shows a screw press with a housing resting on a base 2. The feed end of the screw press is marked with reference 3 and its discharge end with reference 4. The screw is marked with reference 5 and the clamping jacket with reference 6. Screw 5 extends outside the discharge chamber 7 and is provided with a shaft pin 8 for connection to the drive. .

An annular bellows member 9 is mounted around the compression outlet. The structure of the bellows member is shown in more detail in Figure 3, which shows that the bellows member comprises a rigid ring 10 and an annular bellows 11 of suitable resilient material sealed to the ring 10.