SE126759C1

SE126759C1 -

Info

Publication number: SE126759C1
Application number: SE849247A
Authority: SE
Priority date: 1947-09-09
Filing date: 1947-09-09
Publication date: 1949-11-22

Description

Uppfinnare: T. Akesson. Inventor: T. Akesson.

Foreliggande uppfinning avser en sadan anordning vid sprutpressar av kohl typ, att man vid given kolvdiameter ,erhaller Okad insprutningskapacitet, d. v. s. det blir mojligt att med bibehallet kolvtryck per cm. pa pressmaterialet avsevart Oka den materialmangd, som for varje arbetsslag kan insprutas i formen i jamforelse med hittills tiliverkade sprutpressar av namnda typ. The present invention relates to such a device in the case of injection molds of the kohl type that at a given piston diameter, an increased injection capacity is obtained, i.e. it becomes possible to maintain the piston pressure per cm. on the press material significantly Increase the amount of material that can be injected into the mold for each type of work in comparison with manufactured injection molds of the type mentioned.

For detta andamal kannetecknas anordningen enligt uppfinningen generellt darav, att sprutcylinderns lopp vid omrhdet f Or inmatningsoppningen uppvisar storre innerdiameter an cylinderloppets framre del samt att sprutkolven dr forsedd med en koaxiell, ph densamma axiellt forskjutbar mantelhylsa, vars ytterdiameter är I huvudsak lika med irmerdiametern i den utvidgade delen av cylinderloppet, varvid anordningen är sa beskaffad, att mantelhylsan under f8rsta delen av kolvens arbetsslag, d. v. s. da pressmateria7 lets motstand mot kolven är relativt lagt, medbringas genom cylinderloppets utvidgade del, sá att i huvudsak all pressmassa i denna inmatas i cylinderloppets smalare del, i vii-ken kolven darefter intrader, medan mantelhylsan forblir i vim a for att under kolvens atergangsslag medbringas av densamma till ett lage bakom fyllningsoppningen. To this end, the device according to the invention is generally characterized in that the barrel of the syringe barrel at the area of the feed opening has a larger inner diameter than the front part of the barrel and that the syringe piston is provided with a coaxial, axially displaceable jacket sleeve, the outer diameter of which is substantially equal in diameter. extended part of the cylinder bore, the device being of such a nature that the jacket sleeve during the first part of the working stroke of the piston, i.e. when the resistance of the press material to the piston is relatively low, is carried through the enlarged part of the cylinder bore, so that substantially all press mass is fed into the narrower part , in which the piston then enters, while the jacket sleeve remains in vim a so that during the return stroke of the piston it is carried by it to a bearing behind the filling opening.

En praktisk utforingsform av denna anordning skall i det foljande beskrivas som exempel i anslutning till bifogade ritning, som ph schematiskt satt visar ett vertikalt langdsnitt: genom en sprutpress av kolytyp, varvid sprutkolven och en del andra detaljer dock aro framstallda i sidovy. A practical embodiment of this device will be described in the following as an example in connection with the accompanying drawing, which ph schematically shows a vertical longitudinal section: through a colytype type injection mold, the syringe plunger and some other details being shown in side view.

Den ph ritningen visade sprutpressen eller sprutmaskinen innefattar pa kant satt ett stativ S, som bildar stod for en sprutcylinder 1 med spruthuvud 20 och munstycksanordning 21, ett magasin 17 for paryllning av pressmassa M, en i cylindern 1 fram och Ater rorlig, hydrauliskt driven sprutkolv 5 saint en med dennas drift synkroniserad, medelst en omstallningsanordning 22 reglerbar doseringsanordning, bestaende av en doseringskolv 18, som arbetar i en doseringscylinder 19 och matar avpassade mangder pressmassa D f Or varje arbetsslag fran magasinet 17 genom en pafyllningskanal 23 till inmatningsoppningen 2 for sprutcylindern. 1. The injection molding machine or spraying machine shown in the drawing comprises on the edge set a frame S, which forms a stand for a spray cylinder 1 with spray head 20 and nozzle device 21, a magazine 17 for piling of press mass M, a hydraulically driven spray piston movable in the cylinder 1 5 saint a dosing device synchronized with its operation, by means of a switching device 22, consisting of a dosing piston 18, which operates in a dosing cylinder 19 and feeds adapted amounts of press mass D f Or each working stroke from the magazine 17 through a filling channel 23 to the inlet opening 2 for the spray cylinder. 1.

Enligt foreliggande uppf inning är Tinteylinderns 1 lopp indelat i en framre del 4 med normal diameter, motsvarande kolvens 5 ytterdiameter, saint en bakre del 3, vars diameter är avsevart storre an delens 4 diameter. I den bakre, utvidgade delen 3 av cylinderloppet inmynnar pafyllningskanalen 23 for pressmassan D, vilken vanligen besthr av pulverformigt eller finkornigt kons thartsmateHal. Pa kolven 5 ar anbragt en med densamma koaxiell, axiellt forskjuthar mantelhylsa 6, nnatarhylsaip, vars ytterdiameter ãr i huvudsak lika med innerdiametern i cylinderloppets utvidgade del 3. Anordningen Or darvid sa beskaffa.d, att mantelhylsan 6 under den forsta delen av kolvens 5 arbctsslag, varunder pressmassan inmatas i den framre delen 4 av cylinderloppet och darfOr erbjuder ringa motstand mot kolvens rorelse, medbringas genom loppets utvidgade del 3, sit att i huvudsak all pressmassa 7 i denna inmatas I loppets smalare del 4. Da kolven 5 och mantelhylsan 6 tillsammans passerat genom lop-pets vidare del 3, hejdas hylsan 6, medan kolyen 5 fortsatter in i cylinderloppets smalare del 4 under utovande av tryck ph massan 7, som ph vanligt satt smaltes och sprutas genom spruthuvudet 20 och munstycket 21 in i en (icke visad) form for de avsedda pressdetaljerna. Under kolvens 5 atergangsslag medbringas mantelhylsan 6 av densamma till ett la.ge bakom inmatningsoppningen 2 for att en ny kvantitet pressmaterial D skall kunna inforas i cylinderloppets vidare del 3. According to the present invention, the barrel of the Tinteylinder 1 is divided into a front part 4 of normal diameter, corresponding to the outer diameter of the piston 5, saint a rear part 3, the diameter of which is considerably larger than the diameter of the part 4. In the rear, widened part 3 of the cylinder bore, the filling channel 23 opens for the press mass D, which usually consists of powdered or fine-grained condensate material Hal. Arranged on the piston 5 is a coaxial, axially displaceable jacket sleeve 6, nnatar sleeve, the outer diameter of which is substantially equal to the inner diameter of the extended part of the cylinder bore 3. The device Or so provided that the jacket sleeve 6 during the first part of the piston 5 , during which the press mass is fed into the front part 4 of the cylinder bore and therefore offers little resistance to the movement of the piston, is brought through the enlarged part 3 of the bore, so that substantially all the press mass 7 in this is fed into the narrower part 4 of the barrel. passed through the further part 3 of the barrel, the sleeve 6 is stopped, while the collie 5 continues into the narrower part 4 of the barrel while exerting pressure ph the mass 7, which ph usually sat was melted and sprayed through the spray head 20 and the nozzle 21 into a ) form of the intended press details. During the return stroke of the piston 5, the jacket sleeve 6 is carried by the same to a position behind the feed opening 2 so that a new quantity of press material D can be introduced into the further part 3 of the cylinder bore.

For att arbeta enligt den beskrivna prin- 2— — ,cipen kan: matarhylsan. 6 enligt uppfinningen anordnas och konstrueras ph flera olika salt, varav ett par skola beskrivas i dot fat-j ande. In order to work according to the described 2— - , cipen kan: matarhylsan. 6 according to the invention, several different salts are arranged and constructed, of which a pair of schools are described in dot form.

I den pa ritningen visade utfaringsformen Sr mantelhylsan 6 vid sin bakre ande 15 forsedd med en radiellt inatriktad flans 16, som omsluter kolvstangen 12 bakom kolven 5. Da flansens 16 framre yta 8 stoder mot kolvens bakre ande 9, ligger hylsans 6 framre ande i plan med kolvens 5 tryckyta 11. Under forsta delen av kolvens 5 arbetsslag Mlles hylsan 6 i detta Iäge relativt kolven 5, genom att en kring kolvstangen 12 fastklamd, pa kolvstangen under lampligt motstand axiellt forskjutbar friktionsring 13 darvid med sin framre sidoyta st6der mot mantelhylsans 6 bakre ande 15. Da mantelhylsan 6 stannar ,och kolven 5 fortsatter framat, fOrskjutes friktionsringen 13 axiellt pa kolvstangen 12, till dess kolven natt sin framre vandpunkt. Under kolvens 5 atergingsslag medfoljer friktionsringen. 13 kolvstangen 12 bakat, till ,dess den stater mot en fast anbragt stoppanordning 14, i samma ogonblick sorn kolvens 5 bakre ande 9 stoter mot mantelhylsans 6 flans 16. Darefter rnedbringas hylsan 6 bakal, samtidigt som stoppanordningen 14 forskjuter friktionsringen 13 axiellt ph kolvstangen 12, till dess i kolvens 5 bakre vandpunkt friktiOnsringen 13 pa nytt pressas till anliggning mot mantelhylsans 6 bakre ande 15, sa att man.telhylsan 6 under forsta delen air kolyens nastfoljande arbetsslag ater medbringas framat genom cylinderloppets utvidgade del 3. Far att sakrare fasthalla ringen 13 i dess franare lage p5 kolvstangen saint for att undvika friktionsmotstandet under ringens axiella f8rskjutning, kan ringen 13 vara anordnad alt I namnda lige pressas till drivpassning med en hadar pa lampligt satt utformad, t. ex. konisk detalj pa kolvstangen 12. In the embodiment shown in the drawing, the jacket sleeve 6 at its rear end 15 is provided with a radially aligned flange 16, which encloses the piston rod 12 behind the piston 5. When the front surface 8 of the flange 16 faces the piston rear end 9, lies the front end of the sleeve 6 in plane with the pressure surface 11 of the piston 5. During the first part of the working stroke of the piston 5 the sleeve 6 is in this position relative to the piston 5, by a friction ring 13 axially displaceable around the piston rod 12 under suitable resistance, thereby with its front side surface abutting the jacket sleeve. 6 rear end 15. When the jacket sleeve 6 stops, and the piston 5 continues forward, the friction ring 13 is displaced axially on the piston rod 12, until the piston reaches its front water point at night. Under the 5 return stroke of the piston comes the friction ring. The piston rod 12 is baked until it rests against a fixedly mounted stop device 14, at the same moment the rear end 9 of the piston 5 abuts against the flange 16 of the jacket sleeve 6, then the sleeve 6 is lowered posteriorly, while the stop device 14 displaces the friction ring 13 axially , until in the rear water point of the piston 5 the friction ring 13 is again pressed into abutment against the rear end 15 of the jacket sleeve 6, so that the jacket sleeve 6 is brought forward again through the extended part 3 of the cylinder bore during the first part of the cylinder bore. in its fringe bearing on the piston rod saint in order to avoid the frictional resistance during the axial displacement of the ring, the ring 13 can be arranged or in the said straight press to drive fit with a hadar in a suitably designed manner, e.g. conical detail on the piston rod 12.

I stallet far att anvanda en sarskild friktionsring 13, kan mantelhylsans 6 inatriktade flans 16 vara anordnad att i nimnda lage bringas till drivpassning med en hail& pa lampligt salt utformad, t. ex. konisk detalj pa kolvstangen 12. Instead of using a special friction ring 13, the aligned flange 16 of the jacket sleeve 6 can be arranged to be brought into drive fit in the said layer with a halo of suitable salt formed, e.g. conical detail on the piston rod 12.

Alternativt kan man for samma andamal anvanda sig av en kring kolvstangen 12 mellan hylsans 6 bakre ande 15 och ett fast anordnat fiste (t. ex. 14) anbragt tryckfjider, vars spanning Sr sa avpassad, att hylsan 6 bibehalles i silt framre lage relativt kolven 5 under dennas rorelse framat genom cylinderloppets utvidgade del 3, varvid fjadern salunda spannes under kolvens 5 atergangsslag. Alternatively, for the same purpose, a compression spring 15 arranged around the piston rod 12 between the rear end 15 of the sleeve 6 and a fixed fist (e.g. 14) can be used, the tension Sr so adapted that the sleeve 6 is maintained in the silt front layer relative to the piston. 5 during its movement forward through the enlarged part 3 of the cylinder bore, the spring thus being tensioned during the return stroke of the piston 5.

I jamforelse med hittills framstallda sprutmaskiner, vid vilka hela cylinderlopliet liar samma diameter, vinner man tack vare del utvidgade fyllningsrummet 3 (lets den fordelen, att en storre mangd pressmaterial kan inmatas i cylindern mellan kolvens arbets slag, d. v. s. man uppnar starre insprutningskapacitet, utan att trycket per cm" a materialet minskar, dels den fardelen, att arbetsslaget utnyttjas effektivare, emedan matarhylsan 6 hjalper till att battre fylla Set torn-rum, som uppstar, da kolven efter en insprutning gar tillbaka, enar materialet, som ju inmatas genom sin egen tyngd, far battre tillfalle att utbreda sig saval franaat in i den smalare delen av cylinderloppet som bakat in i den utvidgade delen. In comparison with hitherto manufactured spraying machines, in which the entire cylinder loop has the same diameter, the advantage is extended thanks to the part of the expanded filling space 3 (the advantage is that a larger amount of press material can be fed into the cylinder between the work of the piston blow, ie you achieve a larger injection capacity, without the pressure per cm "a of the material decreases, partly the advantage that the working stroke is used more efficiently, because the feed sleeve 6 helps to better fill the Set tower space, which arises when the piston returns after an injection , the material, which is fed by its own weight, has a better chance of spreading saliva franaat into the narrower part of the cylinder bore which is baked into the enlarged part.

Uppfinningen Sr givetvis icke begransad till de Mr visade och beskrivna utforingsformerna utan kan varieras ph olika sitt mom ramen for uppfinningstanken, som definieras genom efterfoljande patentansprak. The invention is of course not limited to the embodiments shown and described above, but can be varied according to its scope within the scope of the inventive idea, which is defined by the appended patent claims.

Claims

Patent claim:

Device for piston-type injection presses for obtaining, at a given piston diameter, increased injection capacity, characterized in that the barrel of the syringe cylinder (1) at the area of the feed opening (2) has a larger inner diameter & the lower part (4) of the cylinder barrel s) that the syringe piston (5) with a coaxial, ph axially displaceable jacket sleeve (6), the outer diameter Sr of which is substantially equal to the inner diameter of the inner part (3) of the cylinder bore, the device Sr sa. provided that the mantethylsan (6) during the first part of the working stroke of the piston (5) is reduced through the extended part (3) of the cylinder bore, sa. that substantially all of the press mass (7) therein is fed into the narrower part (4) of the cylinder bore, in which the piston (5) then enters, while the jacket sleeve (6) remains at rest so that during the return stroke of the piston (5) it is carried by it to a straight behind the feed opening (2).

2. Device according to claim 1, characterized in that the jacket sleeve (6) and the piston (5) are provided with corresponding, si coated and arranged stop means (8, 9), that the front edge (10) of the sleeve (6), then the stop means (8, 9) stand against each other, Sr occupied in plane with the front surface (11) of the piston (5).

Device according to claim 1 and 2, characterized in that the jacket sleeve (6) is arranged to be held relative to the piston (5) by one of the piston rods (12) during the movement of the piston (5) forward through the enlarged part (3) of the cylinder bore. behind the sleeve (6) axially displaceably arranged friction ring (13) or the like, so that a pushing, fixedly arranged stop device (14) arranged in the friction ring (13) (6) rear end (15).

4. Device according to claims 1 and 2, characterized therefrom, or the jacket sleeve (6) Sr arranged to resiliently be held in silt - 1.26759 - 3 front age relative to the piston (5) by a circumference around the piston rod (12) between the rear end of the sleeve (6) (15) and a fixedly arranged fixed pressure spring, the tension of which is adapted so that the sleeve (6) is maintained in its front position relative to the piston (5) during its movement forward through the extended part (3) of the cylinder bore.

5. Device according to any one or more of the preceding patent claims, characterized in that the jacket sleeve (6) at its. the rear dude (15) is provided with a radially aligned flange (16) or the like, which encloses the piston rod (12) behind the piston (5), said flange (16) and the rear end of the piston (5) forming said corresponding stop means (8, 9). Stockholm 1949. Kungl. Boktr. P. A. Norstedt & Siker 490080