SE510217C2

SE510217C2 - Stacker

Info

Publication number: SE510217C2
Application number: SE9601526A
Authority: SE
Inventors: Kenth Wettersten
Original assignee: Kenth Wettersten
Priority date: 1996-04-22
Filing date: 1996-04-22
Publication date: 1999-05-03
Also published as: SE9601526L; WO1997039968A1; SE9601526D0

Abstract

Pallet stacker for upstacking or downstacking of pallets, resting on each other in a stack. The pallet stacker comprises a lift mechanism, being disposed to lift a lower pallet one or more pallet heights, at wish, in engagement at two opposite side edges of said pallet for enabling upstacking of pallets during building-up of the stack from beneath. The lift mechanism is in one embodiment disposed to engage two opposite side edges of the second lowest pallet of the stack for lifting this pallet and the pallets above, at least one pallet height for enabling the removal of the lowest pallet of the stack and thus, downstacking from beneath.

Description

ÉNIÛ 217 2 använd för uppstapling av lastpallar; Fig. 2 är en perspektivvy av en annan sàsom exempel vald utföringsfornl av en pallstaplare enligt uppfinningen använd för nedstapling av lastpallar, varvid lastpallarna frigörs en och en i sänder fràn en stapel; Fig. 3 är en sidovy av pallstaplaren enligt föreliggande uppfinning, delvis i snitt; Fig. 4, 5 och 6 visar detaljer av stommen till pallstap- laren enligt föreliggande uppfinning i sidovy, frontvy bak- ifrán resp. planvy uppifrån; Fig. 7 visar en manöver- och lyftmekanism i pallstaplaren enligt föreliggande uppfinning; Fig. 8 visar manöver- och lyftmekanismen i fig. 7 i något större skala; Fig. 9 och fig. 9A visar en vänster lyftbalk i sidovy resp. i ändvy; Fig. 10 och fig. 10A visar en höger lyftbalk i sidovy resp. i ändvy; Fig. ll är en delvy, som visar manöver- och styrdon till pallstaplaren enligt föreliggande uppfinning. ÉNIÛ 217 2 used for stacking pallets; Fig. 2 is a perspective view of another exemplary embodiment of a pallet stacker according to the invention used for unloading pallets, the pallets being released one by one from a stack; Fig. 3 is a side view of the pallet stacker according to the present invention, partly in section; Figs. 4, 5 and 6 show details of the frame of the pallet stacker according to the present invention in side view, front view from behind and plan view from above; Fig. 7 shows an operating and lifting mechanism in the pallet stacker according to the present invention; Fig. 8 shows the operating and lifting mechanism of Fig. 7 on a slightly larger scale; Fig. 9 and Fig. 9A show a left lifting beam in side view resp. in end view; Fig. 10 and Fig. 10A show a right lifting beam in side view resp. in end view; Fig. 11 is a partial view showing actuators and controls for the pallet stacker according to the present invention.

Den såsom utföringsexempel i fig. l och 2 visade pall- staplaren enligt föreliggande uppfinning är avsedd för EUR- pall med màtten 800 x 1200 mm och får normalt belastas med maximalt 20 pallar. Naturligtvis kan andra mätt och andra antal ifrágakomma. I exemplet i fig. 1 visas en pallstaplare, generellt betecknad 10, använd för uppstapling av lastpallar L i en stapel S, varvid figur 1 avser att visa, att man kan stapla upp lastpallarna L en och en i sänder, tvà àt gängen eller tre àt gängen, varvid lastpallarna förs till pallstapla- ren liggande pà en icke visad s.k. pallvagn för påbyggnad av pallstapeln underifrån.The pallet stacker according to the present invention shown as exemplary in Figs. 1 and 2 is intended for EUR pallets measuring 800 x 1200 mm and may normally be loaded with a maximum of 20 pallets. Of course, other measurements and other numbers may come into play. The example in Fig. 1 shows a pallet stacker, generally designated 10, used for stacking pallets L in a pile S, wherein Fig. 1 is intended to show that the pallets L can be stacked one at a time, two at a time or three to the gang, whereby the pallets are taken to the pallet stacker lying on a so-called pallet truck for attaching the pallet pile from below.

Enligt figur 2 används pallstaplaren 10 för nedstapling av lastpallar en och en i sänder frán stapeln S, varvid last- pallarna uttas fràn stapelns undre ände medelst en pallvagn.According to Figure 2, the pallet stacker 10 is used for stacking pallets one by one at a time from the stack S, the pallets being removed from the lower end of the stack by means of a pallet truck.

Ehuru detta icke visas är det även möjligt att tömma pallsta- plaren 10 helt genom att man uttar hela pallstapeln S pá en gang.Although this is not shown, it is also possible to empty the pallet stacker 10 completely by removing the entire pallet stack S at once.

Den visade pallstaplaren 10 bestàr av en i planvy U-for- mig làdstomme ll, som är öppen i den ena änden (den vänstra änden i fig. 3) för att möjliggöra lastpallarnas införande och uttagande. Làdstommen kan i en speciell utföringsform ha en undre öppning i sin bakre sida, motsatt den öppna änden, för att möjliggöra genomgång av lastpallarna genom staplaren. U- formens skänklar 11A, llB och dess tvärbalk eller bakstycke llC är làdformiga för att inrymma manöver- och lyftmekanis- merna, fig. a4, 5 och 6. 510 217 3 Pallstaplarens lyftmekanism innefattar en hydraulcylinder 12, som via en hydraulslang 13 matas från ett hydraulaggregat 14. En jämförelse mellan fig. 7 och 8 visar, att hydraulcylin- dern 12 är anordnad att lyfta resp. sänka ett ok 15, i vilket två kedjehjul 16, 17 är lagrade bredvid varandra. Kedjehjulen 16, 17 tjänar såsom brythjul för var sin kedja 18, 19, vilka kedjor har sina ena, inre ändar fästa i var sitt fäste 20 resp. 21 på en med 22 generellt betecknad àkvagn medan kedjor- nas andra, yttre ändar är fästa vid var sin svängbar lyftbalk 23 resp. 24. Lyftbalkarna 23, 24 är svängbart lagrade kring axlar 25, 26 och deras övre ändar är påverkade för svängning i riktning mot varandra medelst en mellan dem gående fjäder 27, så att kamrullar 28 vid lyftbalkarnas undre ändar kan löpa antingen mot utsidan av var sin kambana 29 eller på insidan om kambanan 29 ifråga.The pallet stacker 10 shown consists of a U-shaped loading frame 11 in plan view, which is open at one end (the left end in Fig. 3) to enable the insertion and removal of the pallets. In a special embodiment, the loading frame can have a lower opening in its rear side, opposite the open end, in order to enable passage of the pallets through the stacker. The legs 11A, 11B of the U-shape and its crossbeam or rear piece 11C are box-shaped to accommodate the operating and lifting mechanisms, Figs. A4, 5 and 6. The lifting mechanism of the pallet stacker comprises a hydraulic cylinder 12, which is fed via a hydraulic hose 13 from a hydraulic assembly 14. A comparison between Figs. 7 and 8 shows that the hydraulic cylinder 12 is arranged to lift resp. lower a yoke 15, in which two sprockets 16, 17 are mounted next to each other. The sprockets 16, 17 serve as breaking wheels for each of the chains 18, 19, which chains have their one, inner ends attached to each of the brackets 20 resp. 21 on a water trolley generally designated 22, while the other, outer ends of the chains are attached to respective pivotable lifting beams 23 and 23, respectively. 24. The lifting beams 23, 24 are pivotally mounted about shafts 25, 26 and their upper ends are actuated for pivoting towards each other by means of a spring 27 passing between them, so that cam rollers 28 at the lower ends of the lifting beams can run either towards the outside of each cam 29 or on the inside of the cam 29 in question.

Anordningen är sådan, att lyftbalkarnas 23, 24 undre ändar svängs i riktning mot varandra, mot fjäderns 27 verkan, när hydraulcylindern. 12 förskjuter sin kolvstång uppåt till läget enligt fig. 8. Lyftbalkarnas undre ändar svängs då i riktning mot varandra, intill dess att de kommer till anslag mot var sin bult 30, fig. 7 och 8, varefter deras svängnings- rörelse stoppas, med lyftbalkarna stående väsentligen. verti- kalt. Härvid intar vippbara lyfttungor 31 på lyftbalkarna ett horisontellt läge, i vilket de kan ingripa med en lastpall för att lyfta denna (tillsammans med eventuella, ovanför lig- gande lastpallar i stapeln), när åkvagnen 22 går uppåt. Denna rörelse uppåt hos åkvagnen 22 uppkommer vid hydraulcylinderns fortsatta förlängning, så att oket 15 går uppåt Frågan huruvida kamrullarna 28 skall gå på den ena sidan om kambanorna 29 och därigenom hålla lyfttungorna 31 i verk- samt, lyftande läge under lyftbalkens hela rörelse uppåt (för införande av en, två eller tre lastpallar underifrån vid upp- stapling) eller initialt hålla dem indragna i ett icke lyf- tande läge under en större eller mindre sträcka av lyftbalkens rörelse för att man så att säga skall "hoppa över" den under- sta lastpallen (vid nedstapling) bestäms av vridningsläget på en axel 32, som är manövrerbar medelst en spak 32A, och är försedd med ett utskjutande finger 33, kan lyfta ett vippbart anslagsfinger 34.The device is such that the lower ends of the lifting beams 23, 24 pivot in the direction of each other, against the action of the spring 27, when the hydraulic cylinder. 12 displaces its piston rod upwards to the position according to Fig. 8. The lower ends of the lifting beams are then pivoted in the direction of each other, until they come into abutment against their respective bolts 30, Figs. 7 and 8, after which their pivoting movement is stopped, with the lifting beams standing essentially. verti- cold. In this case, tiltable lifting tongues 31 on the lifting beams assume a horizontal position, in which they can engage with a pallet to lift it (together with any pallets lying above it in the stack), when the carriage 22 goes upwards. This upward movement of the carriage 22 occurs during the continued extension of the hydraulic cylinder, so that the yoke 15 goes up. insertion of one, two or three pallets from below during stacking) or initially keep them retracted in a non-lifting position for a greater or lesser distance of the movement of the lifting beam in order, so to speak, to "skip" the bottom the pallet (when stacked) is determined by the rotational position of a shaft 32, which is maneuverable by means of a lever 32A, and is provided with a projecting finger 33, can lift a tiltable stop finger 34.

Pallastaren enligt uppfinningen är naturligtvis försedd med erforderliga manöverdon för styrning av t.ex. hydraulcy- linderns 12 arbete och för övervakning av de enskilda funktio- nerna, t.ex. så, att lyft- eller nedsänkningsrörelsen stoppas eller icke kan igångsättas om en lastpall har fastnat eller har inkommit snett i staplaren osv.The pallet loader according to the invention is of course provided with the required actuators for controlling e.g. the work of the hydraulic cylinder 12 and for monitoring the individual functions, e.g. so that the lifting or lowering movement is stopped or cannot be started if a pallet has got stuck or has entered obliquely in the stacker, etc.

Ett antal modifikationer och detaljändringar kan företas 510 217 4 inom ramen för den ovan beskrivna och i patentkraven angivna uppfinningen .A number of modifications and detailed changes may be made within the scope of the invention described above and set forth in the claims.

Claims

510 217 Patent claims

Pallet stacker for loading and / or unloading pallets comprising a lifting mechanism, which is provided with engaging means (31), which by means of engaging drive means can be moved from engaging position to a free position, and a lifting means (22) connected to the engaging means, substantially vertically displaceable. driven by a lifting drive means for bringing said engaging means to at least two different engaging levels in a pallet stack, characterized in that the engaging drive means and the lifting drive means are a common mechanism drive means (12) for both raising and lowering the lifting means and for providing the engaging engaging means resp idle mode.

Pallet stacker according to claim 1, characterized in that the mechanism drive means consists of a displaceable rod (12), on which at least one breaking plate (16, 17) is mounted, over which an elongate flexible element (18, 19) is carried, one end of which are connected to the engaging means (31) and the other end of which is connected to the lifting means (22), the rod (12) from a retracted starting position in a first movement moving the engaging means out of engaging position until their movement is stopped by stopping means, after which further displacement of the bar lifting means and thus the engaging means for ﬂ being moved to the desired level.

Pallet stacker according to claim 2, characterized in that the displaceable rod is a piston rod in an outer cylinder (12), the cylinder housing of which is relativtx relative to the lifting and engaging means.

Pallet stacker according to claim 3, characterized in that the outer cylinder is a hydraulic cylinder (12), fed from a hydraulic unit (14).

Pallet stacker according to one of Claims 2 to 4, characterized in that the elongate element is a gear chain (18, 19) and in that the break plate is a sprocket (16, 17).

Pallet stacker according to one of Claims 2 to 5, characterized in that the engaging means are arranged on a spring-actuated spring, which is mounted in the lifting means (22) around a substantially horizontal axis and can be rotated about a substantially horizontal axis, one end of which is connected to a tension spring (27) and the other end of which is connected to the elongate ib visible element.

Pallet stacker according to one of Claims 2 to 6, characterized in that the lifting means consists of a vertically movable carriage (22) which comprises a bracket (20, 21) for the other end of the visible element.

Pallet stacker according to one of Claims 2 to 6, characterized in that it comprises two elongate flexible elements (18, 19) arranged on separate breaking discs (16, 17), which are mounted on one with the displaceable rod. (12 connected ok (15), one end of one ﬂexable element being connected to engaging means for engaging one side of a pallet and one end of the other element visible element being connected to engaging means intended to engage with the opposite side of the pallet and wherein the two andra the other end of the visible elements is each connected to the lifting means.

Pallet truck according to claim 6 and claim 8, characterized in that the engaging means for the opposite pallet sides each comprise a lever (24) rotatable on either side of the pallet, which levers are connected to each other by a common 'pull' spring. (27).