SE468832B

SE468832B - Roller screen having a variable screening gap

Info

Publication number: SE468832B
Application number: SE9103596A
Authority: SE
Inventors: R Drugge
Original assignee: Lkab Malmberget
Priority date: 1991-12-03
Filing date: 1991-12-03
Publication date: 1993-03-29
Also published as: SE9103596L; SE9103596D0

Abstract

The present invention relates to a roller screen having a variable screening gap. The roller screen comprises slidably fastened blocks 8 for the mounting of roller axles 6, the blocks 8 comprising fastening members for bearing devices 22 intended for mounting of the roller axles 6, which allow the rollers 4 to be fitted and removed without any alteration to the setting of the blocks 8. The roller screen additionally comprises adjusting members 32,34 which are disposed between the blocks 8 and enable individual adjustment of the distance between consecutive blocks 8 and, at the same time, adjustment of all the distances between consecutive blocks 8. <IMAGE>

Description

15 20 25 30 40 ..,. :- GN is c7;ﬁ O _ r \)i-. 2 rat. På en rullsikt med 30 rullar innebär en justering av en spalt med 1 mm att de övriga spalterna ändras 0,003 mm. I en konventionell rullsikt med fast siktspalt måste minst hälften av lagerhusen flyttas om en spalt är fel. Med rullsikten enligt uppfinningen förbättras noggrannheten med antalet rullar n, dvs. om en spalt justeras med 1 mm medför detta att de övriga spalterna ändras 1/n mm. 15 20 25 30 40 ..,. : - GN is c7; ﬁ O _ r \) i-. 2 rat. On a roller screen with 30 rollers, an adjustment of a gap of 1 mm means that the other slots change 0.003 mm. In a conventional roller screen with a fixed screen gap, at least half of the bearing housings must be moved if a gap is incorrect. With the roller screen according to the invention, the accuracy is improved with the number of rollers n, i.e. if a gap is adjusted by 1 mm, this means that the other gaps change 1 / n mm.

Ytterligare fördelar med rullsikten med variabel sikt- spalt enligt uppfinningen är följande.Additional advantages of the variable sieve roller screen according to the invention are as follows.

- Alla spalter kan ändras samtidigt med god precision med tillåtna variationer i fjäderkonstanter så om spalterna ändras 1 mm så blir variationerna mellan olika spalter mindre än + 0,025 mm.- All gaps can be changed at the same time with good precision with permitted variations in spring constants, so if the gaps change 1 mm, the variations between different gaps will be less than + 0.025 mm.

- Rullsikten kan göras kompakt så att relativt små rullar kan användas vilket ökar siktkapaciteten då man får plats med fler spalter.- The roller screen can be made compact so that relatively small rollers can be used, which increases the screen capacity when you can fit more columns.

- Genom individuellt inställda gap kan sikten separera flera fraktioner. - Även fasta, manuellt justerbara gap kan anordnas genom att ersätta tallriksfjädrarna med distanshylsor.- Through individually set gaps, the screen can separate several fractions. - Even fixed, manually adjustable gaps can be arranged by replacing the disc springs with spacer sleeves.

- Genom den fjädrande konstruktionen kan rullsikten klara större föremål (t.ex. verktyg eller bult) som hamnar mellan rullarna utan att rullarna böjs. Även stötar från större materialklumpar dämpas upp.Due to the resilient construction, the roller screen can handle larger objects (eg tools or bolts) that end up between the rollers without the rollers bending. Shocks from larger lumps of material are also dampened.

Uppfinningen kommer i form av exempel att närmare be- skrivas under hänvisning till ritningen, vari fig. 1 visar en planvy på en del av en rullsikt med variabel siktspalt enligt uppfinningen ; fig. 2 visar en perspektivvy på ett block och justeringsorgan som ingår i rullsikten enligt uppfinningen och fig. 3 visar en tvärsnittsvy på det i fig. 2 visade blocket.The invention will be described in more detail by way of example with reference to the drawing, in which Fig. 1 shows a plan view of a part of a rolling screen with a variable screen gap according to the invention; Fig. 2 shows a perspective view of a block and adjusting means included in the roller screen according to the invention and Fig. 3 shows a cross-sectional view of the block shown in Fig. 2.

I figur 1 visas en planvy på en rullsikt 2 enligt upp- finningen innefattande ett antal rullar 4 (3 st. i det i figur 1 visade exemplet) försedda med varsin axel 6. Dessutom inne- fattar rullsikten 2 ett antal block 8 försedda med lageranord- ningar 10 för lagring av rullaxlarna 6. Mellan blocken 8 finns justeringsorgan 12 anordnade för justerande av avståndet mellan blocken 8 och således siktspalten mellan rullarna 4. Dessutom innefattar rullsikten kedjehjul (ej visade) vilka är anordnade på drivsidan av rullaxlarna 6 för kedjedrift av rullarna 4'på konventionellt sätt. I figur 1 visas dessutom en av två dom- 10 15 20 25 30 40 468 832 3 krafter 14 vilka användes för sammanhållande av blocken 8 och justeringsanordningarna 12.Figure 1 shows a plan view of a roller screen 2 according to the invention comprising a number of rollers 4 (3 in the example shown in Figure 1) provided with each shaft 6. In addition, the roller screen 2 comprises a number of blocks 8 provided with bearing devices. Between the blocks 8 there are adjusting means 12 for adjusting the distance between the blocks 8 and thus the screen gap between the rollers 4. In addition, the roller screen comprises sprockets (not shown) which are arranged on the drive side of the roller shafts 6 for chain drive of the rollers. 4 'in a conventional manner. Figure 1 also shows one of two jacks 14 used for holding the blocks 8 and the adjusting devices 12 together.

I figur 2 visas en perspektivvy på en detalj av rullsik- ten enligt uppfinningen. I figur 3 visas en tvärsnittsvy på det i figur 2 visade blocket. I figur 2 framgår det att blocket 8 har en urtagning 20 för att ge plats åt axeln 6 till rullen 4.Figure 2 shows a perspective view of a detail of the roller screen according to the invention. Figure 3 shows a cross-sectional view of the block shown in Figure 2. Figure 2 shows that the block 8 has a recess 20 to make room for the shaft 6 of the roller 4.

I varje ände av blocket 8 finns fästorgan för fästande av lagerhus 22 där axeln 6 lagras upp medelst ett lager 24. I figurerna 2 och 3 visas dessutom ett fastsättningsbart lock 26 vilket är avsett för att styva upp blocket 8. Blocket 8 glider på en glidskena 28 med hjälp av ett linjärlager 30. Konsekutiva block 8 hålles isär av tallriksfjädrar 32 som på ena sidan verkar direkt mot blocket 8 i härför avsedd ursvarvning (ej visad) och på andra sidan verkar mot ett mothåll 34 som skruvas in på en tapp 36 i blocket 8. Fastsättningen av blocket 8 mot linjärlagret 30 sker med en gummibussning 38 som tillåter en snedställning i horisontalplanet på ca: 5° för att undvika brytkraften om rullarna 4 är något snedställda. För tydlighets skull påpekas att de i figur 1 visade justeringsorganen 12 vartdera består av en tallriksfjäder 32 samt ett mothåll 34.At each end of the block 8 there are fastening means for fastening the bearing housing 22 where the shaft 6 is mounted by means of a bearing 24. Figures 2 and 3 also show a fastenable lid 26 which is intended to stiffen the block 8. The block 8 slides on a slide rail 28 by means of a linear bearing 30. Consecutive blocks 8 are held apart by disc springs 32 which on the one hand act directly against the block 8 in the intended turning (not shown) and on the other hand act against an abutment 34 which is screwed into a pin 36 in the block 8. The attachment of the block 8 to the linear bearing 30 takes place with a rubber bushing 38 which allows an inclination in the horizontal plane of approx. 5 ° to avoid the breaking force if the rollers 4 are slightly inclined. For the sake of clarity, it is pointed out that the adjusting means 12 shown in Figure 1 each consist of a disc spring 32 and an abutment 34.

Genom blockets 8 speciella konstruktion kan rullarna bytas utan att inställningen på rullsikten ändras genom att locket 26 borttages samt genom att lagerhusen 22 lossas från blocket 8 (genom uppskruvande av de visade bultförbanden) varvid en enstaka rulle eller flera rullar samtidigt kan utbytas utan att inställningen mellan blocken 8 ändras. Medelst ett därför avsett verktyg kan mothållet 34 skruvas in eller ut på tappen 36 i blocket och genom denna skruvning kan avståndet mellan varje rullpar inställas separat samt åstadkomma samtidigt ändrande av samtliga spalter. Genom individuellt inställda gap är det dessutom möjligt att använda rullsikten för separerande av flera fraktioner.Due to the special construction of the block 8, the rollers can be changed without changing the setting on the roller screen by removing the cover 26 and by loosening the bearing housings 22 from the block 8 (by unscrewing the bolt connections shown), whereby a single roller or several rollers can be replaced blocks 8 are changed. By means of a tool intended for this purpose, the abutment 34 can be screwed in or out on the pin 36 in the block and by this screwing the distance between each pair of rollers can be set separately and at the same time effect changing all the slots. Through individually set gaps, it is also possible to use the roller screen to separate several fractions.

Tallriksfjädrarna är så valda att med 4 tallrikar kan siktspalten varieras 8 mm, från t.ex. min 8 mm till max 16 mm.The disc springs are so selected that with 4 discs the screen gap can be varied 8 mm, from e.g. min 8 mm to max 16 mm.

Med 6 tallrikar kan spalten varieras 12 mm osv.With 6 plates, the gap can be varied 12 mm etc.

Inom det området varierar tryckkraften från 1000 kg vid spalt 16 mm till 3000 kg vid spalt 8 mm. Kraften åstadkommas såsom visats med domkraft 14 (se figur 1). Den stora kraften är till för att friktionen i linjärlagret och dragkraften från kedjedriften inte ska ha någon betydelse. Dessutom blir rull- .i Ü 4 4bö Sri sikten stabil. Användandet av tallriksfjädrar ger stora fjäder- krafter. Genom att axlarna är anordnade i urtagningarna i blocken fås fjäderkrafterna att verka i rullarnas centrumlinjer Wilket därmed minimerar brytkraften i linjärlagren.Within that range, the compressive force varies from 1000 kg at gap 16 mm to 3000 kg at gap 8 mm. The force is achieved as shown by jack 14 (see Figure 1). The large force is there so that the friction in the linear bearing and the traction force from the chain drive should not matter. In addition, roll- .i Ü 4 4bö Sri visibility becomes stable. The use of disc springs provides great spring forces. Because the shafts are arranged in the recesses in the blocks, the spring forces are caused to act in the center lines of the rollers. Wilket thereby minimizes the breaking force in the linear bearings.

Den i fig. 1-3 visade utföringsformen utgör endast exempel på hur uppfinningen kan realiseras och utgör ingen begränsning av uppfinningen, vilkens skyddsomfång anges i patentkraven. :n.§The embodiment shown in Figs. 1-3 is only an example of how the invention can be realized and does not constitute a limitation of the invention, the scope of which is stated in the claims. : n.§

Claims

10 15 20 25 30 40 2 468 852 PATENT CLAIMS

Roller screen with variable screen gap comprising shaft-provided rollers (4) arranged so that consecutive rollers (4) are arranged with a spaced apart, slidably attached block (8) for storage of the roller shafts (6), characterized in that the blocks ( 8) comprises fastening means for bearing devices (22) intended for bearing the roller shafts (6), the fastening means and the bearing devices (22) being arranged such that the rollers (4) can be mounted and dismounted without changing the setting of the blocks (8), and that the rolling screen comprises adjusting means (32, 34) arranged between the blocks (8), which enable individual spacing of consecutive blocks (8) to be set individually and simultaneous setting of all distances between consecutive blocks (8).

Roller screen according to claim 1, characterized in that each block (8) comprises a recess (20) arranged for the roller shaft (6) and in that the bearing devices (22) consist of a recess (20) mountable on each side of each block. bearing housing (22) for bearing the roller shafts (6).

Roller screen according to claims 1-2, characterized in that the adjusting means (32, 34) arranged between the blocks (8) each consist of a disc spring (32) and an abutment member (34).

4. A roller screen according to claims 1-3, characterized in that the blocks (8) and the adjusting means (32, 34) are held together with jacks (14) for proportionally varying all distances between the blocks (8).

Roller screen according to claims 1-4, characterized in that the blocks (8) are slidably attached to a sliding member (28) by means of a linear bearing (30), and in that each block (8) is attached to the linear bearing (30) with a resilient means (38) for allowing tilting of the blocks (8) to avoid breaking force in the presence of inclined rollers (14).

Roller screen according to claims 2-5, characterized in that the recesses (20) arranged for the roller shafts (6) consist of U-shaped grooves (20) and in that the bearing housings (22) are mounted on the blocks (8) by means of bolts.

Roller screen according to claims 3-6, characterized in that the disc springs (32) on the one hand act against one in each ¿ff ﬁ nian f U i; U d. In the block (18) arranged recess and on the other hand against the stop (34) which is adjustably arranged on a pin (36) arranged in the block (8).

Roller screen according to claims 5-7, characterized in that the sliding member (28) is constituted by a sliding rail (28) and in that the resilient member (38) is constituted by a rubber bushing (38).

9. A roller screen according to claims 1-8, characterized in that the setting of the distance between the blocks (8) and thus the rollers (4) takes place by means of a screw.

Roller screen according to claims 1-9, characterized in that the roller screen further comprises a sprocket arranged on each roller shaft (6) for chain operation of the roller screen. w