SE1551476A1 - Doctor arrangement for a disc filter - Google Patents

Abstract

13/13 ABSTRACTThe invention reietes to en irnbroved debtor biede errengernent ter disc tiiters. The inventive docter biede errengenient eornbrises one stetionery oredie (32) iobetedbetween the dises ot the diss tiiter end ene deeter biede heider (39) whieh deeterbiede hoider eernerises severei ttnite eiernents (31) eienfiped between e tieteiengeted knite bese nriernber (33) end e knite eiernbing ber (34) using e tirst set ottestening rnerrtbers (41). Abeerding te the inventien is the doctor biede heider es eneunitery rnember ioeked to the eredie ifvith e second set et testening members (42,42b), end rney be guided etong the eredie during rrteuntirtg er rernovei in e seternenner. The doctor biede heider end eredie hes eenfipiimentery V-sheped guidesdrteees (3223, Išïše) eieng the iength et the deeter biede errengernent, end preterebiye gripeing rnernber (40) et the beter end et the doctor biede heider. (figß) KST15006SE_text.dOcx

Description

1/13 DOCTORARRANGEMENT FORA DISC FILTER Background of the Invention The inventien reiates te diss fiiters using deeter hiades fer seraeing eff the fiiter cakeaesumuiated en the disc fiiter during fiitering. Espesiaiiy when the dise fiiters areused fer fiitering eut iime mud frern ereeess iieuers, fer exampie white iieuer in theeaustizising department ef a euie miii, the deeter hiades are suhieeted te extensivewear and need te he made in speeiaiiy hardened steei er even eeramiee, andereferahiy tungsten earhide is used.

Prior Art Üeeter hiade arrangements are used in a number ef different rnaehines. Vaimet ABdeiiver severai different deeter eiade heiders such as Litetïšerneatztfff; LiteFit Piusfif;LiteFitTTf, LiteAdaetTM and FiherDeeT-“vi fer eaeer and tissue maehines and simiiaraeeiieatiens fer seraping eff fiher tuehs andfer fiher residues. in these heiders theentire heider erefiie may iee remeved frem the machine, enaieiing maintenance werksueh as Knife reeiaeemeitt en the machine fieer. "fypisaiiy these Knives are made hywear resistant earben steei er hard aiieys. in serne aepiieatiens the wear en the knife is extraerdinary high and this aepiies ferexameie in fiitering equipment in the eaustizatien area, where dry iime mud isseraped efi hy the deeter hiade. Lime mud is extremeiy ahrasive and hehaves aimestiike grindiitg paste such as siiieen earhide (Stål), aise known as earherundum. inerder te ehtain a reasenahie eeeratienai iifetime fer the deeter arrangement is thusknives with superier hardness needed, and tyeieaiiy are knives made in materiai tuithhigh Tungsten earhide eentent er better materiai used. Tungsten earhide itnives fer time mud deetering are presentiy standard Vaimet seieetien.

Tungsten earhide is aheut 2 times stifier than eenventienai steei ter knives, and has aYeunge meduius ef ever 5% Cšfta, eften between äíše-Yfit) Gifta, whieh even iseensideraeiy stiffer than eemrnereiai eteiiite aiieys, ie. eehait-ehremium aiieysdesigned fer wear resistance, and used hy severai deeter hiade suepiiers.(lemmereiai steiiite aiieys may have a stiffnees aheut fítuüd ef that ef tungstenearhide, i.e. in the erder ef 599 it/ii-'ta (205 GPa). The prehiem vvith manufacturing efthese tungsten earhide knives is that suhseduent maehining ie aimest imeessibie, and rnest often the knives are east te size and eessihiy eniy sharpened siightiy hy KST15006SE_text.dOcx 2/13 grinding or iaser rnachining. Hence, the costs tor tungsten carhide doctor hiadeshecornes very high, so during instatiation and repiacenfient ntust the doctor hiade arrangernent he handied with care and with high personai satety. in order to obtain a cost ettective soiutioh using these expensive knives is the doctorarrangernent designed with a nurnher ot knite segrnents stretching over the ettectivetiitering area ot the disc, trorn the center and out to the outer periphery ot the disc. Aitnite rnade in one singie piece and corresponding to the tength ot the doctorarrangemant vvouid tzecorne too expensive, and ditticuit to produce.

Theretore, in state ot the art doctor arrangernents tor caustization disc tiiters is thedoctor inciuding a nurnher ot shorter knite segntents, each rnounted on the doctorarrangernent, Now this soiution rnakes reptacentent ot entire knite edge, or cart ot it, tinte consurning and aiso ditticuit due to restricted access in~t>etween the discs.

Summary of the Invention: "the generai objective ot the invention is to enahie a sate and tast instaiiation orrernovai ot the doctor hiade arrangernent in disc tiiters hy one singie servicepersonnei, despite the circurnstance that the doctor oiade arrangernent is iong andheavy and extends ih between tvvo harrovviy rnounted tiiter discs that restrictaccessihiiity, "the Knives in doctor piades tor iirne ntud rentovai are typicaiiy razorsharp and the handiing ot the doctor hiade arrangerhent rnust he handied hy theservice persorinei such that tuii support is obtained during the entire rnouriting orrernovai process, and avoids rupture ot the tiiter cioth on the discs. i-tence, the doctor hiade arrangernent according the invention is used in a disc tiiterto titter out tihe and highiy ahrasive particie ntateriat in a ravv suspension conftprisinga rotating shatt with a rnuititude ottiiter discs rotating in a vat. The doctor hiadearrangernent inciudtng a doctor hiade hoider paraiiei with the tiiter surface ot the tiiterdisc and with a iehgth ot the doctor hiade hoider corresponding to the active tiiteringdistance ot the disc tiiter as rneasured trorn the center ot the tiiter disc and to theouter radiai end ot the tiiter disc. Severai knite eiernents rnade trorn hard ntetai with aYoungts rnoduius higher than 200 Gt-ta, and preterahiy above 500 GPa, are attachedto the hiade hoider with renriovaoie tirst set ot tastening rnenricers. Further a coiiection KST15006SE_text.dOcx 3/13 chute iocated under the doctor hiade hoider tornis a suhstantiaiiy verticai hox iikecoiiection chute with an upper opening under the doctor hiade hoider and a toweroutiet in the tower part ot the vat. The doctor hiade arrangernent according theinvention coniprises a doctor hiade hoider detachahiy niounted in a stationary cradiearranged in the disc tiiter with a tower V-shaped guide surface on the doctor hiadehoider iocated at the opposite side to the scraping edges ot the itnite eierrientsrnounted on the doctor hiade hoider. Further the cradie inciudes a correspondingcornpienfientary V-shaped guide surface supporting the tower V-shaped guidesurtace ot the doctor hiade hoider when rnounted in the cradie and iocated abovethe chute and in a 'fixed position reiative the chute with a second set ot tasteningrnentpers ditterent trorn the tirst set ot tastening niernhers. By this design couid thedoctor oiade hoider as one unitary rriernoer he rernoved hy ioosening ot the secondset ot tastening nternioers with aii knite eientents tirntiy attached to the doctor hiadehoider hy the action ot the tirst set ot tastening ntientihers and extracted trorn thecradie white siiding the doctor hiade hoider over the tiflshaped surtaces.

A singie service personnei couid then sateiy and virith ioad support to the inner end otthe doctor oiade hoider siide the whoie doctor hiade arrangernent in between thenarrow iying tiiter discs, reducing risks ot dropping the doctor hiade hoider andcausing dents or ourrs to the share edges ot the i-tnife. "the entire procedure ofrernovai and instaiiation ot a new sharp doctor hiade arrangernent tyiii pe done intractions of the time necessary to change doctor knite hiades ot the prior art design,where each irnite hiade is secured to a stationary cradie with 2 tastening screws, andyvhere the inner Knives are ditticuit to access as they are at the center ot the disc tiiterand in between 2 tiiter discs.

According to a preferred ernoodirnent ot the doctor hiade arrangernent is the secondset ot tastening rnernhers tor the doctor hiade hoider inciuding an inner torrn iociringrnernher at the inner end ot the doctor hiade hoider at the center ot the tiiter discwhen rriounted in the cradie, with a cornpiernentary torrn iocking rnentoer in thecradie, and at ieast one rentovahie tastening rrienther cioser to the other outer end otthe doctor hiade hoider when ntounted in the cradie. With these torrn ioci-tingrrientpers at the inner end ot the doctor hiade hoider and cradie, is aiso this inner endsecureiy tastened without requiring access to screws or sirriiiar tastening rnerrther at the very center ot the disc tiiter.

KST15006SE_text.dOcx 4/13 Preferabty is the inner form ioctdng member of the doctor biade hoider and thecompiemerttary form iocking member of the cradie comprising a first finger iiitemember extending in the direction of the doctor biade hoider and an aperture for thefinger iiite member in each of the cradie and the doctor biade hoider respectiveiy.The iocking interaction between the finger iike member and the aperture may beobtained in the finai stiding phase when pushing the doctor biade hoider over the V~shaped surfaces.

According to the invention may aiso the doctor biade hoider comprise a singie fiatbase member with the tower guide surface integrated with it, and at ieast onegeneratiy fiat ciamping member ciamping at ieast one Knife eiement to the fiat basemember under the action of at ieast one fastening member in the first set of fasteningmembers. Thus the doctor biade hoider forms a sandwiched structure with the singieeiongated base member and a singie eiongated ciamping member hoiding the knifebiades in between.

Different modes of appiying the ciamping force onto the Knife eiements may be used,and in the generai embodiment may fewer fastening members in the first set offastening members be used, Le. fevver than the number of Knife eiements, if theciampirtg member is sufficierttiy stiff. As the overaii weight of the doctor biade hoideris important to reduce, it may be advantageous to reduce stiffness and tft/eight of theciamping member and instead use more fastening members. Preferabiy is theciamping member one singte ciamping bar for aii Knife eiements with at ieast asmany fastening members in the first set of fastening members as there are itnifeeiements, and preferabiy with at ieast one fastening member iocated for appiication of a ciamping force directiy to each knife eiement. in a further embodiment virith increased ciamping pressure on each knife eiernentmay atso at ieast two fastening members in the first set of fastening members be iocated for appiication of a ciamping force directiy to each itnife eiement. in order to reduce time for removai and instaiiation of the doctor biade hoider andeasy access is the second set of fastening members for the doctor biade hoiderinciuding at ieast two removabie fastening members, and aii of these second setfastening members are arranged within a distance not exceeding få meter, KST15006SE_text.dOcx 5/13 eretereeiy not exoeeding i rneter, es rneesured trorn the outer rediei end ot the tiiterdise end towerds the oenter ot the tiiter diso.

Fer oersonei setety end reduced risk ter drooping the doctor eiede hoider is enintegreted grieoing rnerneer et the other outer end ot the doctor eiede hoider whenrnounted in the stetionery oredie., "the gripeing rnenther is preferehiy in tornt ot hendiewith e ciosed eiongeted eoerture eneoiing insertiori ot e hend ot servioe eersonnei inthe eeerture end grioeing eround the hendie tvith e eiosed hendgrip.

The generei orinoieie ot the invention is the use ot cornoiernentery “t/»sheoed guidesurteces en the doctor ioiede hoider end the oredie, end in e preferred design otthese V~sheeed guide surteees is the “t/»sheoed guide surteoe on the doetor hiedeheider ere inoiined versus e vertioei oiene end et en engie iving in the renge ätkddïend thet the eorresoonding oonteiernentery V-sheeed guide surteoe ot the oredie ereinciined versus the vertioei oiene end et the serne engie.

List of Drawings in the toiiowing sohernetio drewings ere deteiis nurnbered eiike in tigures, end deteiisidentified end nurnhered in ene figure rney not he iturnhered in other figures in orderto sirneiity tigures.

Figure t; show e crossseetionei side view ot e oonventionei diso tiiter; Figure 2; show e eross-seotioriei end view of the disc tiiter es seen in section A-Ain tigure t, with conventionei oonteoiteitts identified; Figure 2e ; show in deteii the intereotien between e doctor i-tnife end the preooet FCtorrned on the disc tiiter; Figure 3e ; show e top view e orior ert doctor errengernent; Figure 3D; seetion B-B in figure Be; show e orosseeetionei end view of the doctor errengernent es seen in Figure de; show e tirst erneodirnent ot the inventive doctor errengernent;Figure de;section 3% in figure 4e; show e oross-sectionei end view of the doetor errengernent es seen in Figure 5e;Figure ätt;section B-B in figure öe; show the kriite hese rnernher being oert ot the doctor errengernent show e cross-sectionei end view ot the itnite hese rnerhher es seen in Figure de te Eid, show in e seouenee 6e~>6t>->6o~>6d how the knite oese rnernher KST15006SE_text.dOcx 6/13 may be entered in between the discs to the finat position;Figure ï; show a finai version of a doctor arrangement, with the knife basemember out of oosition from the stationery cradie; Figure 8 show the tinai version of a doctor arrangement, with the Knife basemember mounted in the stationary credie; Figure 9 show the finai version of a doctor arrangement, with the Knife basemember siightiy retracted from the mounting oosition in the stationary cradie; Figure tue; show a crosssectionai end view of the knife base member as seen overthe first set of testening members; and Figure tub; show a cross-sectionai end view of the irnife base member as seen over the second set of fastenirig members; and Detailed Description of the InventionCONVENTEGNAL DESC FELTER FEATURES in figures 1 and 2 ere disciosed basic weii known deteiis of e disc fiiter.

The disc 'fiiter 1 is used to fiiter out fine berticie materiai in e raw suspension endcornprises a rotating hoiiovv shaft 11 with a muititude of fiiter disc 12 rotating in a vat1G with et ieast e semicircuiar bottom wait tue iocated in bottom bart of the disc fiiter.The fiiter discs drains the fiitrate to the hoiiovif shaft via outiets 13.

A doctor btade 30 is arranged oaraiiet vvith the fiiter surface of the fiiter disc 12, and acoiiection chute iocated under the doctor biade forms a substantiaiiy verticai box iikecoitection chute with an upper opening 26 under the doctor biade and a tower outiet2? in the tower bart of the semicircuiar bottom part tue of the vet. åaid box iitreooiiection chute having two waiis 29a/29b oriented paraiiet with the fiiter surface ofthe fitter disc 12 and two waiis 28a oriented aiong the fiiter surface of the fiiter disc12.

The disc fiiter1 inciudes at ieast one disc 12. The discfâ is simiiar to those describedin the orior art in that soiid materiai is removed from raw siurry by forcing the iiouidthrough fittering discs 12, whiie the soiid fine oerticie materiai accumuiates on thefiiter. The iiduid is forced through the discs 12 by creating a pressure difterentiatbetween the inside of the tiiter housing 10 end the outiet. The discs 12 may be eoerforated materiat such as metai and covered with a fine mesh cioth such as a KST15006SE_text.dOcx 7/13 eeiyereeyiene cieth. The fiiter rnateriai is referred te generaiiy as the fiiter cieth. Eachdisc 12 is divided into disc secters (net shown) which are individuaiiy cevered withfiiter cioth. The discs 12 are oositioned within the housing tt) that heids the rawseiidiiieuid siurry in hettent hart at a certain iiciuid ievei Liet. The ievei of the rawsiurry can vary hut tyoicaiiy is aeeroxirnateiy ciese te er heiow the center ef the disc12. As the discs 12 retate, each sector fufiy enters the siurry and an arneunt ef seiidmateriai is deoesited on the surface ef each disc sector. The seiid materiai is thenrerneved frorn each secter te separate the seiid frorn the iiduid. When fiitering greener white iiouor siurries in the recevery isiand of a ouic rriiii is the fiiter cieth as suchnot sufficient te reach a few earticie content in the fiitrate. The cioth is ntere used tehe ahie to forrn a precoat fayer of fine carticies en the cioth, and after estahiishrnentof the hreceat ceuid effective fiitratierf hegin ehtaining a fiitrate with few earticiecontent. When iirne rnud earticies huiid up en this creceat, a scraper mechanism isused te rerneve the particies.

The scraper mechanism inciudes a doctor hiade 3G that rernoves the cake iayer frornthe ereceat PC iayer as shown in figure Ze. As each disc sector oasses through thesiurry and ernerges frern the siurry, additienai sofid rnateriai is dehesited en thesurface of the disc sector. As the disc secters pass the doctor hiade 30, the caiteiayer ferrned on teh ef the ereceat iayer is rerneved. The rernoved seiie rnateriai faiishy gravity inte a hox iike chute with an intet 26 arranged heiotv the doctor hiade St).

The disc fiiter rnay aise inciude wash shewers and precoat renewai high pressure jetsystern, for exantpie the SQUTRTTM systeni seid hy Vattnet, hut these are net shownas they hiay ne reie doctor hiade design. in figure 3 is shown a crier art doctor hiade arrangernent with a statienary cradie 32arranged ever the fiiter surface frern the outer end ”i2e ef the disc and towards theinner end t2i of the disc cfese te the shaft. in figure Sh is this doctor hiadearrangernent seen in the cross section view B-B as seen in figure 3:a. A nurnher ofirnife eiernents 31 are screwed to the cradie 32, with two rneuhting screws for eachKnife eiernent. titiheit these knife eiernents are te he reciaced rnust the serviceeersenhei reach aii the way inte the center of the disc fiiter fer the fast Knife eiernentiecated ciesest to shaft, and the risk is that the screws rnay he iost and dreoped inte the vat. This design have set severe restrictions en how ciese the disc rnay he KST15006SE_text.dOcx 8/13 rnounted, as the scace hetween the disc niust he so iarge that a person rnay enter into the disc vat via the rnanhoie (9 see figure 2). in figure 4a is shown a first scherriatic erncodirnent of the inventive doctor hiadearrangernent, using a stationary cradie 32 and one doctor fotade hoider ßili. "thedoctor hiade hoider 3G cornorises an eiongated fiat oase rriernher 33 with the Knifeeiernents ciarnped to it ioy a knife ciarnping har 34. in this emoodirnent are 2 screwsused to acoiy a ciantoing force front the knife ciantoing har 34 on each of the Knifeeiernertts 31. in figure da is oniy the doctor hiade hoider 3G shown, seen in section B-B in figure šh, with a handie 4G iocated at the outer end, and a forrn iocking rnerncer 42 on the inner end. in figures da to tšd are shown schernaticaiiv how the doctor hiade hoider 3G isintroduced into the disc fiiter and finaiiy rnounted in the cradie. in figure 6a is shownhow the doctor tziade hoider 3G is introduced into the disc fiiter via the rnanhoie 9. innext step, figure tät), is the doctor hiade hoider droooed into contact with the cradiesuch that the V-shaped guide surfaces corne into point contact with each other. inthis oositiort couid the service oersonnei hoid the doctor oiade hoider in the griopingrnernher 4G whiie nfiost of the weight ioad front the doctor oiade hoider is supportedfront the cradie. As shown in figure oc is the doctor oiade hoider in next phaseoushed cioser to center of the fiiter vvhiie siiding the ooirit contact between the guidesurfaces cioser to disc fiiter center and iowering of the outer end. in the finairnounting oosition as shown in figure Gd is the guide surface of the doctor ioiadehoider in fuii iine contact with the cornciintentary guide surface of the cradie. "fhedoctor ciade hoider is iocked in position with dedicated iociring screws 42 rnountedcioser to outer end, and with a distance E) shorter than 1,5 rrieter, oreferaoiy shorterthan t rneter, front the outer end which enaoie access frorn the inanhoie.

Finai oroduction version in figure 7 is shown a finai production version of the inventive doctor ciadearrangernent, with the doctor hiade hoider 39 separated to the ieft frorn the cradie 32.in figure Tr” is the doctor hiade hoider 3G rnounted in the cradie 32. in figure Sa isshown a detaii of the fingeriike forrn iociring rriernher 42h oefore the doctor oiadehoider is finaiiy pushed to the ntounting position, where the 'fingeriike fonn iockingrnernher tests in a cornoiententarv forrn iociring aoerture 42h' of the cradie. tt shouid KST15006SE_text.dOcx 9/13 be hoteo that the fihgeriike forrn iocking rhernber rnay aiternativeiy be integrated withthe creciie and the eberture in the Knife base rneniber 33 instead., in figure Qb isshown in oetaii the guide surfece 33e of the knife bese rriernber 33 es weii as the guide surface 33e of the creoie 32, with these parts siightiy seoareteo. 5 in figure fbe ano ”itib is shown a cross section view of the cioctor bfaoe hoioer 3G,where figure fbe show a cross section over ohe of the sorews in the first set offestening members, end figure "iiib shotiv e cross seotioh over one of the screws in the seconci set of festening nternbers, Aoooroingiy, it is to be urioerstooo thet the present invention has been described by 10 way of iiiustretion and not iimitetion., KST15006SE_text.dOcx

Claims (1)

1. A doctor hiade arrangernent in a disc tiiter (t) used to tiiter out tine and highty ahrasive oarticie rnateriai in a raw suspension corncrising a rotating shatt (11)with a ntuititude ot 'titter discs (12) rotating in a vat, said doctor hiadearrangernerit inciuding a doctor htade hoider (39) paraitei ifvith the tiiter surtaceot the tiiter disc (12) and with a tength ot the doctor hiade hoidercorresponding to the active tittering distance ot the disc tiiter as rneasuredtrorn the center ot the tiiter disc (12 i) and to the outer radiai end ot the tiiterdisc (12 o), and severai knite eiernents (31) rnade trorn hard rrietat with aYoungs inoduius higher than 200 GPa, and oreterahiy above ätit) GPa,attached to the hiade hoider with rernovacte tirst set ot tastening rnenihers(41), and a coitection chute (Zda) iocated under the doctor htade hoider andtorrning a sucstantiatiy verticat box iii-te coitection chute with an uooer opening(26) under the doctor htade hoider and a tower outiet (27) in the tower part otthe vat, characterized in that the doctor htade hoider (Išd) is detachaotyrnounted in a stationary cradte (32) arranged in the disc tiiter with a tower V-shaped guide surtace (ëíša) on the doctor ciade hoider tocated at the oppositeside to the scracirig edges ot the knite eiernents rnounted on the doctor ctadehoider, and that the cradie inctudes a corresconding cornpienientary V~shapedguide surtace (32a) supporting the tower V-shaoed guide surtace ot the doctorhiade hoider when rnounted in the cradte and iocated ahove the chute and ina tixed position reiative the chute with a second set ot tastening rnernhers (42)ditterent trorn the tirst set ot tastenihg rnernhers, such that the doctor hiadehoider as one unitary rnernoer rnay he removed hy toosening ot the secondset ot tastening rnenthers with aii khite eiernents tirrniy attached to the doctorhiade hoider hy the action ot the tirst set ot tastening rnenthers and extractedtrorn the cradte white siiding the doctor ctade hoider over the Vehaoedsurtaces. . A doctor hiade arrangenient according to ciairn 1 characterized in that the second set ot tastening rnernoers (42) tor the doctor htade hoider inctudes an inner tornt tocking rnernher (rtêh) at the inner end ot the doctor hiade hoider atthe center ot the tiiter disc when rnounted in the cradte, with a cornoiernentarytorrn tociting nternher (ft-Bo) in the cradie, and at ieast one rernovahie KST15006SE_text.dOcx ll/13 fastening member (42) cioser to the other enter end of the doctor biade hoider tft/hen mounted in the cradie. . A doctor biade arrangement according to ciaim t characterized in that the inner form iocking member of the doctor biade hoider and the combiementaryform tociting member of the cradie combrises a first finger iiite member (42b)extending in the direction of the doctor biade hoider and an aberttire (rtêb) forthe finger tike member in each of the cradie and the doctor btade hoider resoectiveiy. . A doctor biade arrangement according to ciaim 3 characterized in that the doctor biade hoider combrises a singie fiat base member (33) with the iowerguide surface (33a) integrated with it, and at ieast one generatiy fiat ciampingmember (34) ciambing at ieast one knife eiement (31) to the fiat base memberunder the action of at ieast one fastening member (41) in the first set of fastening members. . A doctor biade arrangement according to ciaim 4 characterized in that the ciamping member (34) is one singie ciamping bar for aii itnife eiements (St)with at ieast as many fastening members in the first set of fastening members(41) as there are knife eiements, and breferabiy with at ieast one fasteningmember iocated for abciication of a ciamping force directiy to each Knifeeiement (31 ). . A doctor biade arrangement according to ciairn 5 characterized in that at ieast two fastening members (tft) in the first set of tastening members are iocated for apciication of a ciamcing force directiy to each knife eiement (ät ). . A doctor biade arrangement according to ciaim 2 cnaracterized in that the second set ot fastening members for the doctor biade hoider incindes at ieasttwo removabte fastening members, and att of these second set fasteningmembers are arranged within a distance not exceeding t,5 rneter, oreferabiynot exceeding f meter, as measured from the onter radiai end of the fiiter disc(12 o) and towards the center of the 'fiiter disc (t 2 i). . A doctor biade arrangement according to ciaim 2 cnaracterized in that the doctor biade hoider aiso inciddes an integrated griboing member (49) at the KST15006SE_text.dOcx 9. 10. 12/13 ether euter and (tZe) et the doctor hiacie heicier when rneuntea in the statienary craaie (32), A ciecter tziaee arrahgerneht according te ctairn tš characterized in that thegrtpptrig rnentieer (40) ia in ternt et hanctie With a etesee eierigatect apertureenaiaiittg ihsertien et a hand et' service pereennei in the aeerture ahci grippihgaround the handie with a eieaee hancigrâp. A eeeter hiacte arrangernent aeeereing te eiairn t eharaeterized in that the V»Shaped guide surface (Bßa) en the ctecter hiade heider (33) are tneiined versusa vertšcai etane (VP) and at an angte iytrig än the range Išteöflfl and that theeerresperieing eernpiernentary Vefiiaeed guide surface (32a) ett the eractie(3221) are tneitneci versus the verticai eiane and at the earne ahgte. KST15006SE_text.dOcx