SE538240C2

SE538240C2 - Feeders for axial feed of logs

Info

Publication number: SE538240C2
Application number: SE1450780A
Authority: SE
Inventors: Jonas Ljung
Original assignee: Söderhamn Eriksson AB
Priority date: 2014-06-24
Filing date: 2014-06-24
Publication date: 2016-04-12
Also published as: SE1450780A1; EP2960026A1; EP2960026B1

Abstract

538 2 SAMMANDRAG I ett matarverk innefattande ett stativ (8) med matarvalsar (2,3,4) anordnade i en fri ande av en respektive bararm (5,6,7) och drivna for rotation, vani bdrarmarna i en uppburen ande dr lagrade i stativet pa axlar (9,10,11) fOrlOpande parallellt och runt axlarna svangbara mellan ett utgangslage och ett utsvangt arbetslage, och vidare van i bararmarna är via ett system av ledade lankar (13,16,19) forbundna inbOrdes och genom lankarna tvingade till samordnad svangning runt sina tillhorande axlar, ãr ett fran stativet fristaende rorelsedampningsorgan (20; 20'; 200) integrerat anordnat i 10 lanksystemet och oberoende av stativet verksamt fOr att bromsa bdrarmarnas atergang fran ett utsvangt lage. 538 2 SUMMARY In a feeder comprising a stand (8) with feed rollers (2,3,4) arranged in a free spirit of a respective bar arm (5,6,7) and driven for rotation, the support arms of a supported spirit are stored there in the frame on shafts (9,10,11) running parallel and around the shafts pivotable between an initial layer and an extended working layer, and further used in the bar arms are connected via a system of articulated links (13,16,19) and forced through the links for coordinated pivoting about its associated axes, a rudder damping means (20; 20 '; 200) independent of the frame is arranged integrated in the link system and independently of the frame acts to slow down the return of the support arms from a flared layer.

Description

538 2 TITEL Matarverk for axiell matning av stock UPPFINNINGENS TEKNISKA OMRADE FOreliggande uppfinning hanfOr sig till ett matarverk inrattat for matning av stock i stockens langdriktning. Uppfinningen hanfOr sig narmare bestamt till ett matarverk av det slag som innefattar ett stativ med en genomgaende oppning och invid Oppningen vinkelmassigt fOrdelat anordnade matarvalsar, vilka matarvalsar är individuellt anordnade i en fri ande av en respektive bararm och drivna for rotation, och van i bararmarna i en uppburen ande är lagrade i stativet pa parallellt fOrkipande axlar och runt axlarna svangbara mellan ett utgangslage och ett utsvangt arbetslage, och vidare vani bararmarna är via ett system av ledade ldnkar forbundna inbordes och genom lankarna tvingade till samordnad svangning runt sina tillhOrande axlar. FIELD OF THE INVENTION The present invention relates to a feeder designed to feed logs in the longitudinal direction of the log. The invention relates more particularly to a feeder of the type comprising a stand with a through-opening and adjacent feed rollers arranged angularly distributed next to the opening, which feed rollers are individually arranged in a free spirit of a respective bar arm and driven for rotation, and used in the bar arms in a supported spirit is stored in the frame on parallel displacing shafts and pivotable about an axis between an initial position and an extended working position, and further the bar arms are connected inboard via a system of articulated links and forced through the links to coordinate pivoting about their associated axes.

BAKGRUND OCH KAND TEKNIK Matarverk av detta slag finner anvandning vid barkningsmaskiner av halrotortyp av det slag som innefattar dels ett fast maskinstativ, dels en relativt stativet roterbart lagrad rotor med ett centralt hal for passerande stockar. Vanligen är ett matarverk placerat pa stativets uppstrOmssida i och RV inmatning av stock i maskinen, medan ett annat motsvarande matarverk är placerat pa stativets nedstromssida for utmatning av en barkad stock. Pa rotorn är monterade ett antal svangbara bearbetningsverktyg som är bestyckade med utbytbara organ som kan pressas mot stockens yta RV avskalning av bark. BACKGROUND AND BACKGROUND ART Feeders of this type find use in deburring machines of the rotor type of the type which comprise both a fixed machine frame and a relatively rotatably mounted rotor with a central shaft for passing logs. Typically, one feeder is located on the upstream side of the stand and RV feeds log into the machine, while another corresponding feeder is located on the downstream side of the stand for feeding a barked log. Mounted on the rotor are a number of pivoting machining tools which are equipped with replaceable members which can be pressed against the surface of the log RV peeling of bark.

Matarverk till barkningsmaskiner har till uppgift att mata fram stockar pa ett snabbt och kraftfullt salt utan att stockarna slirar i kontakten med matarvalsarna. Matarvalsarna är for andamalet typiskt utforda med friktionshOjande organ, till exempel i form av utstickande spetsar eller dylikt, i sin mantelyta. Matarvalsarna maste av samma orsak lianas distinkt anpressade mot stockarna men samtidigt eftergivligt fOlja ojamnheter i ytan hos stockar av varierande dimensioner. 1 538 2 Det ãr vanligt att matningshastigheten genom ett matarverk vid barkningsmaskiner uppgar till storleksordningen ett par meter per sekund eller mera. Det inses darvid att matarvalsar och lankar utsatts for hOga dynamiska belastningar och snabba omstallningsrorelser ndr en stock inkommer i matarverket respektive nar stocken lamnar matarverket. Feeder for debarking machines has the task of feeding logs on a fast and powerful salt without the logs slipping in contact with the feed rollers. For this purpose, the feed rollers are typically challenged with friction-raising members, for example in the form of protruding tips or the like, in their mantle surface. For the same reason, the feed rollers must be distinctly pressed against the logs, but at the same time resiliently follow irregularities in the surface of logs of varying dimensions. 1 538 2 It is common for the feed rate through a feeder at debarking machines to be of the order of a few meters per second or more. It is thus understood that feed rollers and tongues are subjected to high dynamic loads and rapid rearrangement movements when a log arrives at the feeder and when the log leaves the feeder.

Ett matarverk av detta slag ãr kant fran sokandens tidigare svenska patent med publiceringsnummer SE 517 517 C2. Utmarkande for detta matarverk ãr en anpressningsmekanism i form av en komprimerbar balg anordnad mellan stativet och en i lanksystemet ingd.ende lank. Baigen ãr anordnad att komprimeras eller expanderas i beroende av matarvalsarnas svangrOrelse och har till uppgift att alstra en tillhallningskraft som sakerstaller matarvalsarnas nodvandiga kontakt med stockens mantelyta. En stotdampare med uppgift att dampa matarvalsarnas rOrelse i samband med att stocken lamnar matarvalsarna dr anordnad att verka mellan stativet och en lank ingdende i lanksystemet. A feeder of this kind is an edge from the applicant's previous Swedish patent with publication number SE 517 517 C2. Distinctive feature of this feeder is a pressing mechanism in the form of a compressible bellows arranged between the frame and a link included in the link system. The Baigen is arranged to be compressed or expanded depending on the movement of the feed rollers and has the task of generating a clamping force which ensures the necessary contact of the feed rollers with the mantle surface of the log. A shock absorber with the task of steaming the movement of the feed rollers in connection with the log leaving the feed rollers there arranged to act between the frame and a long member of the landing system.

I det kanda matarverket overfOrs ansenliga dynamiska laster i form av stotar och vibrationer till stativet i samband med att stocken inkommer respektive lamnar matarverket. Dessa stotar och vibrationer utgor en stor belastning av stOtdamparfastet och stativet. In the known feeder, considerable dynamic loads in the form of bumps and vibrations are transferred to the stand in connection with the log arriving or leaving the feeder. These bumps and vibrations place a large load on the shock absorber bracket and the stand.

KORT REDOGORELSE FOR UPPFINNINGEN Foreliggande uppfinning syftar till att undanroja ovan namnda nackdel hos det kanda matarverket. BRIEF SUMMARY OF THE INVENTION The present invention aims to obviate the above-mentioned disadvantage of the known feeder.

I korthet uppnas syftet genom ett matarverk av inledningsvis namnt slag, van i ett fran stativet fristaende rorelsedampningsorgan ãr integrerat anordnat i lanksystemet och oberoende av stativet verksamt for att bromsa bararmarnas atergang fran ett utsvangt lage. Harigenom undanrOjs eller reduceras vasentligen risken av slitage eller utmattning orsakad av stOtar och vibrationer som eljest overfors till stativet. In short, the purpose is achieved by a feeder of an initially named type, used in a stirring steaming means independent of the stand, is arranged integrated in the link system and independently of the stand acts to slow the return of the bar arms from a forced layer. This substantially eliminates or reduces the risk of wear or fatigue caused by bumps and vibrations that are otherwise transmitted to the stand.

Sâ som tidigare namnts innefattar matarverket ett stativ med en genomgdende Oppning och invid oppningen vinkelmassigt fOrdelat anordnade matarvalsar vilka matarvalsar ar individuellt anordnade i en fri ande av en respektive bdrarm och drivna Mr rotation, och van i bdrarmarna i 2 538 2 en uppburen dnde dr lagrade i stativet pa parallellt forlopande axlar och runt axlarna svangbara mellan ett utgangsldge och ett utsvangt arbetslage, och vidare van bararmarna är via ett system av ledade lankar forbundna inbOrdes och genom lankarna tvingade till samordnad svangning runt sina tillhOrande axlar. Lanksystemet innefattar mellan bararmarna kopplade stangformade lankar, vilka i var ande är ledat kopplade till en respektive bararm, samt en mellan lankarna infogad och relativt dessa ledat kopplad medbringare. I ett utfOrande av uppfinningen ãr rorelseddmpningsorganet verksamt kopplat mellan medbringaren och en av namnda tva lankar. As previously mentioned, the feed unit comprises a stand with a continuous opening and adjacent feed angles arranged angularly distributed next to the opening, which feed rollers are individually arranged in a free spirit of a respective support arm and driven Mr rotation, and used in the support arms in 2 538 2 a supported end stored there. in the frame on axially extending axes and around the axles pivotable between an output beam and a flared working position, and further the bar arms are connected inwardly via a system of articulated links and forced through the links to coordinate pivoting about their associated axes. The lance system comprises rod-shaped lugs connected between the bar arms, which in each spirit are hingedly connected to a respective bar arm, as well as a carrier inserted between the lugs and coupled jointly relative thereto. In an embodiment of the invention, the motion damping means is operatively connected between the carrier and one of the said two tubes.

FOr andamalet uppvisar den aktuella lanken en fran matningsbanan sett utat riktad konsol tjanande som ett fOrsta taste fOr rOrelsedampningsorganet. Enligt samma utforande kan medbringaren vara utford som en fran matningsbanan sett utat riktad konsol verkande som en med bdrarmen medsvangande momentarm, tjanande som ett andra taste fOr rorelsedampningsorganet. For this purpose, the line in question has an outwardly directed bracket seen from the feed path, which serves as a first key for the tube steaming means. According to the same embodiment, the carrier can be challenged as an outwardly directed bracket seen from the feed path, acting as a torque arm floating with the carrier arm, serving as a second key for the motion damping means.

I matarverket är vidare anordnat ett tillhallningsorgan verksamt Mr att alstra en tillhallningskraft varmed matarvalsarna anpressas mot den matade stockens utsida. Detta tillhallningsorgan kan till exempel vara realiserat i form av en fjadrande Mg, sasom en luftfylld balg, anordnad att verka mellan ldnksystemet och stativet. In the feeder, a holding device is further arranged, effective Mr to generate a holding force with which the feed rollers are pressed against the outside of the fed log. This holding means can for instance be realized in the form of a resilient Mg, such as an air-filled bellows, arranged to act between the link system and the frame.

I olika utfOranden av uppfinningen ãr ett tillhallningsorgan i form av en mekanisk fidder, en gasfiader eller en hydraulisk fidder integrerat i rorelsedampningsorganet. In various embodiments of the invention, a holding means in the form of a mechanical feeder, a gas feeder or a hydraulic feeder is integrated in the rudder steaming means.

KORT BESKRIVNING AV RITNINGARNA Utforingsexempel av uppfinningen beskrivs nedan med hanvisning till bifogade ritningar, av vilka Fig. 1 schematiskt visar ett matarverk i utgangslage sett fran inmatningssida eller utmatningssida, Fig. 2 i en motsvarande vy visar ett delvis modifierat matarverk i arbetsldge, och Fig. 3 visar en del av hydrauliken till ett utfOrande av uppfinningen. 3 538 2 DETALJERAD BESKRIVNING AV FOREDRAGNA UTFORINGSEXEMPEL Ett matarverk 1 fOr matning av stock i stockens ldngdriktning innefattar typiskt tre stycken matarvalsar 2, 3 och 4 vilka upplodres i den fria anden av en respektive bdrarm 5, 6 och 7 vilka i en uppburen ande dr svdngbart lagrade i ett maskinstativ 8. Bdrarmarna är darvid lagrade pa axlar 9, och 11 vilka strdcker sig parallellt och vasentligen i stockens matningsriktning genom matarverket. Axlarna 9-11 är vinkelmassigt jamnt fOrdelade omkring en Oppning 12 genom stativet, och kan med andra ord sagas vara placerade i spetsarna av en likbent triangel. Matarvalsarna 2-4 är drivna i rotation R fOr att med sina mantelytor i tangentiell anliggning mot en stock mata densamma genom oppningen 12. En tankt matningsbana genom matarverket definieras pa detta sat genom matarvalsarna och deras mot matningsbanan tangentiellt orienterade mantelytor. Bokstaven C betecknar i ritningarna ett centrum RV matningsbanan. BRIEF DESCRIPTION OF THE DRAWINGS Exemplary embodiments of the invention are described below with reference to the accompanying drawings, of which Fig. 1 schematically shows a feeder in the starting position seen from the input side or output side, Fig. 2 in a corresponding view shows a partially modified feeder in working order, and Figs. 3 shows a part of the hydraulics for an embodiment of the invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A feed unit 1 for feeding logs in the longitudinal direction of the log typically comprises three feed rollers 2, 3 and 4 which are loaded in the free spirit by a respective support arm 5, 6 and 7 which are supported in a stored in a machine stand 8. The carrier arms are then mounted on shafts 9, and 11 which extend parallel and substantially in the direction of feed of the log through the feed unit. The shafts 9-11 are angularly evenly distributed around an opening 12 through the frame, and in other words can be said to be placed in the tips of an isosceles triangle. The feed rollers 2-4 are driven in rotation R so as to feed it with their circumferential surfaces in tangential abutment against a log through the opening 12. A tank feed path through the feed unit is defined in this way by the feed rollers and their circumferential surfaces oriented towards the feed path. The letter C in the drawings denotes a center RV feed path.

Matarvalsarna kan via en kedje- och kuggvdxeltransmission vara gemensamt drivna av ett enstaka drivorgan, men kan alternativt vara individuellt drivna av separata drivorgan som är anordnade i respektive bdrarm eller matarvals. The feed rollers can be jointly driven by a single drive means via a chain and gear transmission, but can alternatively be individually driven by separate drive means which are arranged in the respective support arm or feed roller.

Bararmar och tillhorande matarvalsar är forbundna inb8rdes via ett system av lankar vilka dr ledat anordnade vid bdrarmarna 5-7. Lanksystemet innefattar narmare bestamt en fOrsta lank 13 vridbart lagrad pa vridtappar 14 och 15 anordnade vid bararmarna 5 respektive 6. En andra lank 16 ãr pa motsvarande sat vridbart lagrad pa vridtappar 17 och 18 anordnade vid bdrarmarna 6 respektive 7. Lankarna 13 och 16 är i huvudsak stangformade och kan uppvisas bockningar for att medge att matarvalsarna svangs utat i overlappande fOrhallande till ldnkarna 13 och 16 (sasom illustreras i Fig. 2). En tredje lank 19 är pa vridtapparna 15 och 17 ledat uppburen i fOrhallande till lankarna 13 och 16. Den tredje lanken 19 verkar som en medbringare for ett rOrelsedampningsorgan 20 pa sat som kommer att beskrivas narmare nedan. Bar arms and associated feed rollers are connected to each other via a system of ladders which are hingedly arranged at the carrier arms 5-7. More specifically, the link system comprises a first link 13 rotatably mounted on pivots 14 and 15 arranged at the bar arms 5 and 6, respectively. substantially rod-shaped and can be bent to allow the feed rollers to be swung outwards in overlapping relation to the links 13 and 16 (as illustrated in Fig. 2). A third link 19 is articulated on the pivot pins 15 and 17 in relation to the links 13 and 16. The third link 19 acts as a carrier for a tube steaming member 20 in a set which will be described in more detail below.

Matarverkets bdrarmar och matarvalsar dr fritt svangbara runt respektive axlar 9-11 och kan genom vridtapparnas 14-15 och 17-18 placering pa bdrarmarna och relativt vridcentra i axlarna 9-11 balanseras sâ att inga vasentliga vridande krafter normalt paverkar matarverket i dess utgangsldge. FOr att sakerstalla matarvalsarnas nOdvandiga ingrepp med 4 538 2 utsidan av den matade stocken är till lanksystemet paford en tillhallningskraft vilken i utforandet av Fig. 1 alstras av ett fjaderorgan 21. Fjaderorganet 21 kan sasom visas i Fig. 1 vara uppburet i ett pa stativet anordnat faste 22 Mr att verka mellan stativet 8 och en i lanksystemet inga_ende lank 16. Fjaderorganet 21 kan utgoras av en i sig kdnd gasfylld Mg eller en s.k. luftijader. The feeder's support arms and feed rollers are freely pivotable about respective shafts 9-11 and can be balanced by the position of the pivot pins 14-15 and 17-18 on the support arms and relative pivot centers in shafts 9-11 so that no significant rotational forces normally affect the feeder in its initial position. In order to secure the necessary engagement of the feed rollers with the outside of the fed log, 535 2 is applied to the link system by a clamping force which in the embodiment of Fig. 1 is generated by a spring member 21. As shown in Fig. 1, the spring member 21 can be supported in a stand fixed 22 Mr to act between the frame 8 and a longitudinal 16 not in the link system 16. The spring member 21 can be constituted by a gas-filled Mg or a so-called airways.

Sa langt beskrivet motsvarar matarverket 1 huvudsakligen det matarverk som dr kant fran SE 517 517 C2. So far described, the feeder 1 corresponds mainly to the feeder on the edge of SE 517 517 C2.

Matarverket 1 skiljer sig fran det kanda matarverket i ett vdsentligt avseende, och narmare bestamt med avseende pa riirelsedampningsorganets anordnande i matarverket. The feeder 1 differs from the known feeder in an essential respect, and more specifically with respect to the arrangement of the steaming means in the feeder.

Rorelsedampningsorganets 20 konstruktion kan vara av det kdnda slag som innefattar en i en cylinder axiellt rorlig kolv vilken delar cylindern i en forsta och en andra kammare, bada fyllda med hydraulvdtska. Kamrarna kommunicerar inbOrdes via en backstrypventil som medger i princip obehindrat flode fran den ena kammaren till den andra, och som med hjalp av en flOdesreducerande strypning bromsar returflOdet for en langsammare kolvrorelse i returriktningen. ROrelsedampningsorganet 20 verkar pa detta salt for att dampa matarvalsarnas rorelser i samband med att en stock lamnar matarverket varvid bdrarmar och matarvalsar svanger tillbaka till utgangsldget innan nasta stock ankommer till matarverket. The construction of the agitation steaming means 20 may be of the known type which comprises a piston axially movable in a cylinder which divides the cylinder into a first and a second chamber, both filled with hydraulic fluid. The chambers communicate internally via a non-return valve which allows basically unobstructed flow from one chamber to the other, and which with the aid of a flow-reducing throttle slows the return flow for a slower piston movement in the return direction. The tube steaming means 20 acts on this salt to vaporize the movements of the feed rollers in connection with a log leaving the feed unit, whereby carrier arms and feed rollers swing back to the starting floor before the next log arrives at the feed unit.

Rorelseddmpningsorganet 20 dr i matarverket 1 anordnat integrerat i lanksystemet och saledes oberoende av stativet verksamt for att bromsa bdrarmarnas atergang till utgangslaget enligt Fig. 1, fran det i Fig. 2 visade arbetsldget van i bdrarmarna dr svangda utat fran matningsbanans centrum C i radiella riktningar. FOr andamalet är rorelsedampningsorganet 20 i sin ena ande ledat uppburet i en pa medbringaren 19 formad konsol 23, tjanande som en forsta fastpunkt 24 for rorelsedampningsorganet. I motstaende ande ãr rOrelsedampningsorganet 20 ledat uppburet i en pa den andra lanken 16 formad konsol 25, tjanande som andra fastpunkt 26 for rorelseddmpningsorganet. Anordnat pa detta sat aktiveras/komprimeras rorelsedampningsorganet 20 enbart som resultat av lankarnas inbordes svangningsrOrelse. Narmare bestamt aktiveras eller "laddas" rorelseddmpningsorganet 20 vid forkortning av avstandet mellan fastpunkterna 24 och 26 som resultat av inbOrdes vridning mellan 538 2 medbringaren 19 och lanken 16 i motstaende vridriktningar runt vridtappen 17, vid bararmarnas svangning utat. Pa motsvarande salt upptas den bromsande kraften internt i lanksystemet vid fOrlangning av avstandet mellan fastpunkterna 24 och 26 som resultat av inbOrdes vridning mellan medbringaren 19 och ldnken 16 i omvanda riktningar. The motion damping means 20 in the feed unit 1 is arranged integrated in the link system and thus independently of the frame operatively to slow the return of the carrier arms to the starting layer according to Fig. 1, from the working tool shown in Fig. 2 pivoted outwardly from the center path C in radial directions. For this purpose, the motion damping means 20 is hinged in one end in a bracket 23 formed on the carrier 19, serving as a first fixed point 24 for the motion damping means. In the opposite spirit, the motion damping means 20 is articulated supported in a bracket 25 formed on the second line 16, serving as the second fixed point 26 for the motion damping means. Arranged in this way, the motion damping means 20 is activated / compressed only as a result of the oscillation movement of the inboard. More specifically, the motion damping means 20 is activated or "charged" by shortening the distance between the fixed points 24 and 26 as a result of internal rotation between the carrier 19 and the tongue 16 in opposite directions of rotation around the pivot pin 17, when the bar arms are pivoted outwards. On the corresponding salt, the braking force is absorbed internally in the linkage system when extending the distance between the fixed points 24 and 26 as a result of inward rotation of the carrier 19 and the link 16 in inverted directions.

Ett modifierat utforande av det ovan beskrivna matarverket dr illustrerat i Fig. 2. I detta utfOrande har fjaderorganet 21 utgatt och ersatts av en med rorelseddmpningsorganet 20' sammanbyggd fjader 27. I generell betydelse kan rorelsedampningsorganet 20' liknas vid ett fjaderben med fjader och stotdampare i kombination. Fjadern 27 kan utgOras av en mekanisk tjader sasom en spiralfjdder, men kan alternativt utgOras av en luftfjader eller en fjader fylld av annan komprimerbar gas. I det modifierade utforandet ãr fjdderorganet som tillhandahdller den nOdvandiga tillhallningskraften mot stockens yta anordnat att verka mellan ldnken 16 och medbringaren 19, och dr med andra ord i likhet med rorelseddmpningsorganet 20, 20' integrerat anordnat i lanksystemet. A modified embodiment of the feeder described above is illustrated in Fig. 2. In this embodiment, the spring means 21 has been discontinued and replaced by a spring 27 integrated with the movement damping means 20 '. In general, the movement damping means 20' can be likened to a spring leg with spring and shock absorbers in combination. The spring 27 may be formed by a mechanical spring such as a coil spring, but may alternatively be formed by an air spring or a spring filled with other compressible gas. In the modified embodiment, the spring means which provides the necessary holding force against the surface of the log is arranged to act between the link 16 and the carrier 19, and in other words, like the rudder damping means 20, 20 ', is arranged integrated in the link system.

Ett fOrdelaktigt utfOrande av det kombinerade fjader- och rorelseddmpningsorganet 20, 20' innefattar en dubbel cylinder 200 vilken visas schematiskt med tillhOrande hydraulik i Fig. 3. Dubbelcylindern 200 är pa motsvarande salt som rOrelsedampningsorganen 20 och 20' integrerat anordnad i matarverkets ldnksystem, och kan i likhet med dessa vara anordnad att verka mellan lanken 16 och medbringaren 19. An advantageous embodiment of the combined spring and rudder damping means 20, 20 'comprises a double cylinder 200 which is shown schematically with associated hydraulics in Fig. 3. The double cylinder 200 is on the corresponding salt as the rudder steaming means 20 and 20' integrated in the feed system and can system. like these be arranged to act between the link 16 and the carrier 19.

Dubbelcylindern 200 innefattar en kolv 201 med kolvstAng 202 vilken dr reglerbar RV andring av dubbelcylinderns totala langd och avstandet mellan lanken 16 och 19 i utforingsexemplet. For andamdlet ãr kolven 201 betjanad av en hydraulkrets 203 som via en ventil 204 reglerar volymen hos de tva kommunicerande cylinderkammare 205 och 206 vilka atskiljs av den i dubbelcylindern axiellt rorliga kolven 201. Harigenom kan storleken av oppningen mellan matarvalsarna 2-4 installas till ett utgangsldge eller fOroppningslage som ãr anpassat till grovleken av de aktuella stockarna. The double cylinder 200 comprises a piston 201 with piston rod 202 which allows adjustable RV change of the total length of the double cylinder and the distance between the lengths 16 and 19 in the exemplary embodiment. For the breath, the piston 201 is operated by a hydraulic circuit 203 which, via a valve 204, regulates the volume of the two communicating cylinder chambers 205 and 206 which are separated by the piston 201 axially movable in the double cylinder. Thereby the size of the opening between the feed rollers 2-4 can be installed to an outlet. or opening law that is adapted to the size of the logs in question.

Dubbelcylindern 200 innefattar vidare en kolv 207 med kolvstang 208 vilken uppvisar de dubbla funktionerna av att a ena sidan dampa matarvalsarnas 5.tergang till utgangsldget ndr en stock lananar matarverket, och a andra sidan utova en tillhallningskraft som okar matarvalsarnas kontakttryck mot stocken under matning genom matarverket. Fir andamdlet är kolven 207 6 538 2 betjanad av en hydraulkrets 209 som via en ventil 210 fordelar hydraulvatska mellan de tva kommunicerande cylinderkammare 211 och 212 vilka atskiljs av den i dubbelcylindern axiellt rorliga kolven 207. Hydraulkretsen 209 innefattar narmare bestamt en envagsventil 213 som Water hydraulvdtska att via ventilen 210 obehindrat flyttas fran kammaren 211 till kammaren 212 da kolven 207 rOr sig i riktning fran hOger till vanster i ritningsfiguren, som resultat av att matarvalsarna svdngs utat av den mellan matarvalsarna infOrda stocken. Ndr stocken lamnar matarverket och matarvalsarna svanger tillbaka, varvid kolven 207 rOr sig i motsatt riktning, passerar hydraulvaskan vid retur fran kammaren 212 till kammaren 211 den reglerbara strypningen 214. Harigenom bromsas Wet och matarvalsarnas rOrelse dampas. The double cylinder 200 further comprises a piston 207 with piston rod 208 which has the double functions of, on the one hand, steaming the feed rollers 'return to the source bed when a log moves the feed unit, and on the other hand exerting a clamping force which increases the feed rollers' contact pressure with the log. . For the second part, the piston 207 6 538 2 is operated by a hydraulic circuit 209 which via a valve 210 distributes hydraulic fluid between the two communicating cylinder chambers 211 and 212 which are separated by the piston 207 axially movable in the double cylinder. The hydraulic circuit 209 more specifically comprises a one-way valve 213 that via the valve 210 it is moved unhindered from the chamber 211 to the chamber 212 when the piston 207 moves in the direction from right to left in the drawing figure, as a result of the feed rollers being swung outwards by the log inserted between the feed rollers. When the log leaves the feed unit and the feed rollers pivot back, the piston 207 moving in the opposite direction, the hydraulic washer passes back from the chamber 212 to the chamber 211 the adjustable throttle 214. This slows down the Wet and dampens the movement of the feed rollers.

En ackumulator 215 är inkopplad for att hOja arbetstrycket i hydraulkretsen 209 och palagga ett tryck som verkar mot den stOrre kolvarean av kolven 207 vilken darmed forspanns i riktning fran vanster till hoger i ritningsfiguren. Harigenom utOvar dubbelcylindern 200 en tillhallningskraft pa lanksystemet och pa matarvalsarna 2-4. Storleken av ackumulatortrycket kan sasom exempel anges till ca 3-3,8 MPa, varvid det hogre trycket tillampas pa matarverkets inmatningssida. Uppfinningen är forstas inte begransad till denna tryckangivelse som endast är infOrd som exempel. FOr fullstandighets skull skall namnas att bokstavsbeteckningarna P och T refererar till anslutningsledningar fran pump respektive till tank. ovriga komponenter som erfordras RV hydraulmediumfOrsorjning och sakerhetsfunktioner har utelamnats fran ritningsfiguren emedan deras anordnande inte är avgiirande Mr uppfinningen och ddrfOr inte krdver nagon narmare beskrivning. An accumulator 215 is connected to increase the working pressure in the hydraulic circuit 209 and apply a pressure which acts against the larger piston area of the piston 207 which is thereby biased in the direction from left to right in the drawing figure. As a result, the double cylinder 200 exerts a holding force on the link system and on the feed rollers 2-4. The magnitude of the accumulator pressure can, as an example, be stated to be about 3-3.8 MPa, the higher pressure being applied to the feed side of the feeder. The invention is of course not limited to this printing indication which is only introduced by way of example. For the sake of completeness, it should be mentioned that the letter designations P and T refer to connecting lines from the pump and to the tank, respectively. Other components required for RV hydraulic fluid supply and safety functions have been omitted from the drawing figure because their arrangement is not essential to the invention and therefore does not require further description.

I sammanhanget skall namnas att dubbelcylindern 200 pa ett fortjanstfullt salt kan manovreras RV Oppning av matarverket i samband med service. Genom motsvarande ins-Wining av ventilerna 204 och 210 kan vid behov ba_da kolvarna 201 och 207 skjutas till sina yttre andelagen i och Mr en maximal svangning utat av matarvalsarna 2-4, RV att pa detta salt erbjuda basta mojliga atkomst RV service pa matarverket. In this context, it should be mentioned that the double cylinder 200 on a deserving salt can be maneuvered RV Opening of the feeder in connection with service. By corresponding ins- Wining of the valves 204 and 210, if necessary, both the pistons 201 and 207 can be pushed to their outer parts in and Mr a maximum oscillation out of the feed rollers 2-4, RV to offer on this salt the best possible access RV service at the feeder.

Utan att avsteg Ors fran uppfinningstanken kan ett alternativt utforande av matarverket innefatta att rorelsedampningsorganet istallet monteras for att verka mellan medbringaren 19 och den fOrsta lanken 13. I fOrekommande fall kan den flOdesreglerande ventilen darvid vara utfOrd med omvand 7 538 2 funktion och inrattad att vid komprimering av kolv/cylinderenheten astadkomma en bromsning av rorelsen hos lanksystemet. Without departing from the inventive concept, an alternative embodiment of the feed unit may comprise that the stirring steaming means is instead mounted to act between the carrier 19 and the first hose 13. In any case, the flow regulating valve may be designed with a reversible function and adjusted to function. of the piston / cylinder unit to slow down the movement of the linkage system.

I bada utforandena uppfylls syftet att undanroja eller vasentligen reducera nackdelen av slitage och utmattning orsakad av att stOtar eller vibrationer overfOrs till stativet. 8 In both embodiments, the purpose of eliminating or substantially reducing the disadvantage of wear and fatigue caused by shocks or vibrations being transmitted to the stand is fulfilled. 8

Claims

538 2 Patent claims

Feeding unit for feeding log in the longitudinal direction of the log, comprising a stand (8) with a continuous opening (12) and adjacent feed rollers arranged angularly distributed at the opening (2,3,4), which feeding rollers are individually arranged in a free spirit. of a respective bar arm (5,6,7) and driven for rotation (R), and accustomed to the support arms in a supported spirit are mounted in the frame on parallel extending shafts (9,10,11) and pivotable about an axis between an initial position and a forced working position, and further the usual arms are connected via a system of articulated links (13,16,19) inboard and forced through the links to a coordinated oscillation around their associated axes, characterized by a moving damping means (20; 20 ') released from the frame. 200) is integrally arranged in the system (13,16,19) of slats and independently of the frame acts to slow down the return of the bare arms to the output lid, the movement damping means (20 '; 200) being assigned an intermediate slat in the link system (13,16,19, 19) ver canting means (27,215) operative for applying a clamping force to the feed rollers (2,3,4).

Feed unit according to claim 1, the system of tubes comprises between the bar arms articulated couplings (13, 16) and a carrier (19) inserted between the lanterns and relatively articulated coupled thereto, characterized in that the stirring steaming means (20; 20 '; 200) is operatively coupled between the carrier (19) and one of said lanes (16).

Feed unit according to claim 2, characterized in that the relevant tongue (16) has a bracket serving as a key (26) for the motion steaming means (20; 20 '; 200).

Feed unit according to Claim 2 or 3, characterized in that the carrier (19) is challenged as a bracket acting as a torque arm floating with the bar arm (6), serving as a key (24) for the rudder steaming means (20; 20 '; 200).

Feed unit according to claim 1, characterized in that the agitation steaming means (20 ') has a holding means (27) integrated therein in the form of a spring means. 9 538 2

Feed unit according to claim 1, characterized in that the rudder damping means pulls a hydraulically driven double cylinder (200) comprising a piston (207) which is actuated by a hydraulic holding means (215) in the form of an accumulator.

Feed unit according to one of the preceding claims, characterized in that the rudder damping means pulls a hydraulically driven double cylinder (200) comprising a piston (201) which is an adjustable RV installation of a pre-opening joint between the feed rollers (2,3,4). 538 2 ".1 538 2/6 '