SE505634C2

SE505634C2 - Screw feeder for supplying raw material to pulp preparation process

Info

Publication number: SE505634C2
Application number: SE9504399A
Authority: SE
Inventors: Bengt Haakansson
Original assignee: Sunds Defibrator Ind Ab
Priority date: 1995-12-08
Filing date: 1995-12-08
Publication date: 1997-09-22
Also published as: SE9504399D0; SE9504399L

Abstract

Removable wear-resistant rails (2) are located in at least the narrow end of the screw pipe (1) and they extend completely around the pipe periphery. The side walls (4,6) of adjacent rails lock against each other in the radial direction and the width of each rail is tapered towards the centre of the pipe in at least the rail region lying inside the inner periphery of the pipe.

Description

15 20 25 30 35 5 0 5 1634 2 '_ Uppfinningen skall nu närmare beskrivas med hän- visning till bifogade ritning, på vilken fig. 1 visar ett tvärsnitt genom övre halvan av ett skruvrör i en pluggskruvmatare och fig. 2 visar en planvy av en slitskena i detta skruvrör i något mindre skala. The invention will now be described in more detail with reference to the accompanying drawing, in which Fig. 1 shows a cross section through the upper half of a screw tube in a plug screw feeder and Fig. 2 shows a plan view of a wear rail in this screw tube on a slightly smaller scale.

I fig. 1 ses övre halvan av ett skruvrör 1 i en pluggskruvmatare i tvärsnitt. Detta skruvrör 1 har ett foder bestående av slitskenor 2, i detta fall till ett antal av åtta runt periferin. Genom att slitskenorna 2 anligger mot varandra täckes hela rörets 1 innerperiferi, och genom att slitskenornas periferiella bredd avtar mot centrum blir slit- skenorna självlåsande i radiell riktning på grund av de laxspår som bildas antingen genom bearbetning av skruvröret eller som i det visade exemplet genom kontakt skena mot skena, som genom sin form bildar sitt eget laxspår. Som framgår av fig. 2 avsmalnar slitskenorna 2 även axiellt på grund av att skruvröret 1 avsmalnar koniskt i matningsrikt- ningen.Fig. 1 shows the upper half of a screw tube 1 in a plug screw feeder in cross section. This screw tube 1 has a liner consisting of wear rails 2, in this case to a number of eight around the periphery. Because the wear rails 2 abut each other, the entire inner periphery of the tube 1 is covered, and because the peripheral width of the wear rails decreases towards the center, the wear rails become self-locking in radial direction due to the salmon grooves formed either by machining the screw tube or as shown by contact. rail against rail, which through its shape forms its own salmon track. As can be seen from Fig. 2, the wear rails 2 also taper axially due to the fact that the screw tube 1 tapers conically in the feed direction.

I det visade utföringsexemplet är den yta 3 av slitskenan 2 som anligger mot motsvarande yta i skruvröret 1 plan. Sidoytan 4 av slitskenan 2 bildar rät vinkel med ytan 3 liksom yttersta delen 5 av den andra sidoytan av slitskenan 2. Den övriga delen av denna sidoyta är utdragen och bildar en yta 6 i 45° vinkel mot nämnda rektangulära ytor 3, 4 och 5 samt anligger mot intilliggande slitskenas vinkelräta yta 4.In the embodiment shown, the surface 3 of the wear rail 2 which abuts against the corresponding surface in the screw tube 1 is flat. The side surface 4 of the wear rail 2 forms a right angle with the surface 3 as well as the outermost part 5 of the other side surface of the wear rail 2. The other part of this side surface is extended and forms a surface 6 at a 45 ° angle to said rectangular surfaces 3, 4 and 5 and abuts against the perpendicular surface of the adjacent wear rails 4.

Den mot centrum vända ytan 7 av slitskenorna 2 har en utform- ning, som tillsammans med den inre delen av ytan 6 på bästa sätt skall samverka med den i skruvröret 1 roterande skruven (ej visad).The surface 7 of the wear rails 2 facing the center has a design which, together with the inner part of the surface 6, is to cooperate in the best way with the screw (not shown) rotating in the screw tube 1.

I fig. 2, som visar en slitskena 2 i planvy, sedd inifrån centrum, visas ett antal dräneringshål 8, för dräne- ring av vätska från den massa som komprimeras i skruvröret.Fig. 2, which shows a wear rail 2 in plan view, seen from inside the center, shows a number of drainage holes 8, for draining liquid from the mass which is compressed in the screw pipe.

Dessa dräneringshål 8 samverkar med motsvarande dränerings- hål i skruvröret (icke visade).These drainage holes 8 cooperate with corresponding drainage holes in the screw pipe (not shown).

I det visade utföringsexemplet är slitskenorna monterade i rektangulära urtag i skruvrörets 1 innerperiferi. 10 15 20 25 30 35 505 634 3 I Emellertid kan denna inre periferiyta vara cirkulär i tvär- snitt och slitskenornas därmed samverkande ytor cirkelbåg- formade. I dylikt fall måste emellertid slitskenorna för- ankras med kil- eller skruvförband. I vissa fall kan det dock vara tilräckligt om de yttersta, vid rörets delningslinje befintliga slitskenorna fästes med dylika förband.In the exemplary embodiment shown, the wear rails are mounted in rectangular recesses in the inner periphery of the screw tube 1. 10 15 20 25 30 35 505 634 3 I However, this inner peripheral surface can be circular in cross-section and the surfaces of the wear rails cooperating therewith are circularly arcuate. In such a case, however, the wear rails must be anchored with wedge or screw joints. In some cases, however, it may be sufficient if the outermost wear rails present at the dividing line of the pipe are fastened with such joints.

Det är i regel tillräckligt att förse skruvrörets smalaste del med fodret enligt uppfinningen, men där täcker dessa nya slitskenor, som är gjorda av ett slitstarkt mate- rial, slitområdet till 100 %. Kilformen eller de bildande laxspåren gör att de automatiskt hålles på plats under monte- ringen, och de vrides inte heller loss av motorelementet via pluggskruven.It is usually sufficient to provide the narrowest part of the screw tube with the lining according to the invention, but there these new wear rails, which are made of a durable material, cover the wear area to 100%. The wedge shape or the forming salmon grooves mean that they are automatically held in place during assembly, nor are they unscrewed by the motor element via the plug screw.

Genom uppfinningen erhålles ett skruvrörsfoder som är billigt i tillverkning med ett minimum av bearbetning och medger en enkel installation och demontering. Slitskenorna kan lätt gjutas i stora serier med färdiggjutna dränerings- hål.The invention provides a screw tube liner which is inexpensive to manufacture with a minimum of machining and allows easy installation and disassembly. The wear rails can be easily cast in large series with pre-cast drainage holes.

Claims

10 15 20 25 30 "sos 634 l qa PATENTKRAV

Screw tube lining in a plug screw feeder for pulp, characterized by at least in the narrower part of the screw tube (1) arranged, against each other around the entire periphery, detachable wear rails (2), which abut each other along their side surfaces (4, 6) , whereby they become self-locking in the radial direction, the peripheral width of the wear rail (2), except in the direction of the narrow end of the screw tube (1), decreasing in the direction of the center of the tube (1), at least in the part of the wear rail (2 ) located inside the inner periphery of the tube.

Screw tube lining according to Claim 1, characterized in that the wear rails (2) are mutually identical.

Screw tube liner according to Claim 1 or 2, in that the abutment surfaces (3) between the wear rails (2) and the inner periphery of the screw tube (1) are flat. k ä n n e t e c k n a t

Screw tube liner according to Claim 3, characterized in that the cross section of the wear rails (2) is rectangular to the part (3-5) which projects into the inner periphery of the tube (1) and the rest of the one side surface (4). ) and that the second side surface has a part (6) abutting against adjacent wear rail, which forms an angle of 45 ° towards the flat surfaces (3-5) of the wear rail.

Screw tube liner according to one of Claims 1 to 4, characterized in that at least a part of the wear rails (2) is also fastened with screw or wedge joints.