FI76111B - MATARROER FOER STYCKETORVS- / GRANULERINGSMASKIN OCH FOERFARANDE FOER FRAMSTAELLNING DAERAV. - Google Patents

Description

'»76111

Peat / granulation machine feed pipe and method of making it

The invention relates to a feed pipe for a lump peat / granulating machine, along which the peat is pressed by a transfer screw 5 per matrix plate or other nozzle member to extrude pulp through the nozzle member to obtain a compact, and which comprises longitudinal grooves on the inside to guide the peat pulp. The invention also relates to a method of manufacturing a supply pipe.

10 Current production methods for peat and also for pellets are usually based on drying the peat in the field from which it was extracted. The work steps have been combined so that the same machine simultaneously removes, cultivates and spreads the raw peat on the field. The machines 15 form a compact from the raw peat, which is intended to be applied as evenly as possible to the field. When the surface of the extrudates dries, it becomes hard and water-repellent. The entire production is dominated by the effort to efficiently dry the extrudates. Matrix plate-based shaping machines are used? 0 mainly to produce a compact smaller than the normal lump peat size. Due to the smaller diameter of the compact, it dries faster than normal lump peat. The typical diameter of the peat extrudates is 50 ... 80 mm and that of the granule 10 ... 30 mm.

25 In all known machines, the peat is pressed in the steel supply pipe to such a high pressure that it exudes through the nozzle members as a press. The nozzle members can be, for example, holes in the matrix plate or transverse pipe nozzles connected to the cone of the peat machine. This: The compression step 30 takes up a substantial part of the power used by the entire machine, for example the return peat machine.

The feed pipe comprises longitudinal grooves on the inside, which in known machines consist of flat irons welded on the inside of the feed pipe. This work step is 35 quite cumbersome and still has to be done by hand. The feed pipe must cause more friction in the circumferential direction for the peat mass flow than the corresponding part of the screw longitudinally so that the 2 'f 76111 screw moves forward to push the peat mass forward. Otherwise, the peat mass packed in the screw slot will start to slide along the circumference. The grooves of this phenomenon seek to prevent it.

5 One notable problem with current machines is corrosion. This occurs in the feed pipe, especially on both sides of the groove, into which the peat mass is packed immobile.

The object of the present invention is to provide a novel and inexpensive supply pipe which reduces the power requirement and the susceptibility to corrosion. The features of the invention are clear from the appended claim 1. The supply pipe according to the invention causes less corrosion problems than before, since most of the material is non-corrosive glass or carbon fiber. The grooves are most preferably made of steel, which can now only be selected from highly corrosion-resistant grades, since normal weldability does not have to be taken into account. The characteristic features of a method of manufacturing a fiberglass feed pipe are set out in claim 2.

20 This allows the grooves to be freely shaped. The entire diameter of the pipe and / or the depth of the grooves can be easily changed by this pipe manufacturing method.

In the following, the invention will be illustrated by way of example with reference to the accompanying figures, which show an embodiment of the invention.

Figure 1 shows a pelletizing granulation machine. Figure 2 shows a main arrangement for the production of a feed pipe. Figure 1 shows a granulation machine using a fiberglass feed pipe 2 according to the invention. Here, peat is pressed for extrusion through holes in the matrix plate 1. The end flanges are also made of fiberglass and are stiffened by ribs formed in the tube 3.

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The supply pipe is made by laminating it on a mold 5 assembled from parts. The grooves 5 have machined grooves into which the countersinks are inserted. The pipe section 7 can then be laminated to the desired thickness. To ensure the attachment of the splines 6 5, they can be provided with suitable gripping members. Flanges 4 are laminated to the end of the pipe, which are reinforced with ribs 3.

This manufacturing method makes it possible to thread the grooves and / or to shape the profile of the grooves and the io gutter between them without significant manufacturing difficulties. The helical groove, in which the thread of the groove is against the thread of the screw, reduces the friction and thus the power required for compression. In order to avoid corrosion, it is advantageous if no peat-collecting cavity is left in the rear part of the groove, in the direction of rotation of the screw. This is avoided by the joint design of the inner part of the tube and the groove, where the tube is laminated smoothly to the rear edge of the groove. Another possibility is to shape the entire groove from fiberglass to the desired profile and reinforce the leading edge of the groove with a steel corner.

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Claims (2)

7611 1 'I A A peat / granulation machine feed pipe (2) along which peat is pressed with a transfer screw per matrix plate (1) or 5 other nozzle members to extrude pulp through a nozzle member to provide a compact, the tube (2) having longitudinal grooves (6) on the inside in that the supply pipe (2) consists mainly of a glass or carbon fiber pipe part 10 (5) and metal grooves (6) or groove reinforcements embedded therein. Method for manufacturing a supply pipe (2) according to claim 1, characterized in that the pipe part (5) is laminated on a mold (7) in which metal grooves (6) or groove reinforcements are previously locked for immersion. 20 25 30 35