EP0824980A1 - Pressing device for sealingly joining a can body with a separation element - Google Patents

Abstract

The tool firms a sealed joint between the wall (46) of a can and an opening tool (47), there being two or more sections (30) round a spindle (37) and together forming an adjustable press-face (49). The sections each extend along part of a peripheral line at right angles to the spindle. The joints between the sections are fractured, so that there are no continuous gaps in the press-face in the axial direction. The sections can be laminated and in two and preferably three overlapping layers, forming stepped edges fitting together. The sections can form parts of discs, working in straight guides (39,42) at right angles to the spindle.

Description

The invention relates to pressing devices according to the Preamble of claim 1.

When making different cans, one around the Can axis extending can wall and at least one at least partially include transverse to the can axis separating element, a first contact surface of the Can wall with a second contact surface that can be applied to the first the separating element brought into tight connection. The separating element can be used as a base, cover or sealing membrane educated.

In the case of cans, it is known to have a base and / or lid or at least Subareas of the first and / or second contact surfaces with Sealing wax to provide by pressing the Contact areas and the application of heat create a tight connection to be able to achieve. To achieve a good press effect For example, pressing devices are used in which the - especially ring-shaped - contact surfaces between inner and outer conical ring parts are introduced while then the ring parts by an axial movement be moved against each other. Through the conical press surfaces the connection is also conical, which is the case with many Cans is not desired.

To also essentially cylindrical connection areas or Achieving interconnected contact areas must at least a pressing surface can be radially adjustable so that this after insertion of the contact surfaces can be pressed against them. For this purpose, collets with axial lamellae are used open state for receiving the cylindrical contact surfaces somewhat conical to the outside or to the inside. The lamellas are pressed together a little by a clamping part, or pressed on. In the areas of the column between the lamellae are not pressed, so that the cannulas pass through the Contact area can remain open. The cannulas are undesirable, axially aligned passage channels between the contact areas.

In a further solution according to the prior art about a cylindrical piece of pipe with a circular cross section along square sides with axially parallel cut surfaces separated, the corners of the square in or lie outside the wall of the pipe section and the cut surfaces each in a central area through the interior of the Guide pipe piece. This creates four outer and four inner, essentially triangular, pressed parts with one each Part of the cylindrical press surface. They are used for pressing outer pressed parts, and the inner parts taken with them Pressed parts, collided. Because the sliding surfaces between the outer and the inner pressed parts across to pressing contact surfaces run, the acute-angled Ends of the pressing surfaces of the inner pressed parts for injuries or wrinkles in the pressed contact surfaces. Around To keep errors as small as possible, the pressure must be as low as possible done exactly with the radius of the pipe section, which is due tolerances of the can parts is often not possible.

When pressing from the inside, at least one pressed part, preferably but must have several pressed parts, with a convex pressing surface from a feed position with a smaller press surface circumference to one Press position can be moved with a larger circumference. The size of usable dividing discs and / or elastic rings is on the smaller extent in the feed position in which the can parts can be fed to the pressing device, adapted. In the press position the pressing surface of the pressed parts does not extend along of the entire larger scope, so that at least one Connect free space to the contact surface to be pressed. In the area the free spaces are not pressed, which leads to a leak Connection, especially leads to cannulation.

When pressing from the outside, at least one pressed part, preferably but must have several pressed parts with a concave pressing surface from a feed position with a larger press area in a press layer with a smaller circumference can be moved. The of Parts that can be moved outside into the press position can be dimensioned in this way be that when they come into contact with each other, form a closed circumference. When colliding, especially in the final phase, in which the interruptions disappear between the press surfaces, the pressed tends Can material to be pinched in the interruptions will. To achieve the closed press surface, the Press parts always in the same end position when pressing brought, what with variations in the can material thickness, or the can cross-section is not always guaranteed.

The object of the invention is now a pressing device to create the ring-shaped, tight connection a can wall with a separating element is suitable and Prevention of cannulae or injuries. The Press device is intended for cans from all known can materials be usable and with the corresponding one Forming the formation of cylindrical, conical or also any other closed or annular connection areas enable. The press surfaces should be convex or can be concave, so that the pressing of Can inside and / or from the outside of the can be done.

The task is solved by realizing the General term features together with the characteristic features of claim 1. Preferred embodiments are by Characterized features of the dependent claims.

The press device includes a press surface that is made up of at least two partial areas of at least two pressed parts put together. The partial areas each extend along one Part of a circumference in a plane that is essentially is perpendicular to the main or can axis. To along the to achieve an uninterrupted pressing over the entire circumference and even if the pressed parts are due to the pressing position of can tolerances some of the optimal mutual arrangement deviate, are those that are adjacent to each other in the axial direction Subareas arranged so that along the entire At least one partial area is always provided circumferentially is. The circumferential direction between partial surfaces of a circumferential line emerging break areas are opposite the break areas of another circumferential line in the circumferential direction postponed. The partial areas are in the axial direction arranged in layers, at least two, preferably but three layers are provided. The adjoining ones Partial areas of different layers are optionally formed by parts abutting one another in the axial direction. However, they are preferably from both sides in the circumferential direction step-shaped bordered press surfaces of the pressed parts, the steps of the adjoining one another in the circumferential direction Press parts fit into each other.

The pressed parts are preferably part-disc or part-ring-shaped trained and are relative to the main axis with their central area mounted radially movable. At the radial movement between the feed and the press position The degree of overlap of the pressed parts varies by interlocking matching steps or layers of the pressed parts more or intervene less. For convex, for pressing from the inside, the press area is the overlap in the Maximum feed position and minimal in the press position. Corresponding is for concave, intended for external pressing, Press areas the maximum overlap in the feed position and in the press position minimal. The guaranteed overlap ensures that when pressing from the inside there are no free press surfaces Passage areas are created and none when pressing from the outside Damage or jamming of can material across the whole contact area is possible.

To achieve a good interaction of the sub-areas, is the outer radius of the convex pressed parts may be little smaller than - but in particular essentially the same size how - the radius of the contact surface to be pressed. Corresponding gives way to the press area formed from the partial areas in the overlap area if necessary a little inwards from the circular shape ab, but is essentially in the press position circular. For connection areas that are not circular Have cross sections in the press position is essentially the given cross section. The same applies to pressed parts concave pressing surface equal to the inner radius of the pressed parts large or slightly larger than the radius of the press Contact area.

The longitudinal contour of the press surfaces in one plane through the The main axis is the desired longitudinal contour between the adjustable contact surfaces to be connected.

A radial movement of the pressed parts has the advantage that the Change from the feed position to the press position due to an extreme small movement of the pressed parts is made possible, between the contact surface and the pressed parts in the circumferential direction in essentially no frictional movement occurs. Due to the little movement and little friction becomes actuation and especially only to reset the pressed parts small force needed. In the preferred embodiments the movement into the press position takes place due to the movement an actuator. The actuator is at Pressing from the inside preferably a displaceable in the axial direction Cone or circular cone part, on the outer or operating surface conical contact surfaces of the pressed parts. When pressing from the outside is preferred as the actuating surface uses a section of a circular cone inner surface, on which cone-shaped outer surfaces of the pressed parts as Contact surfaces. To achieve the desired movement are the pressed parts in particular in one straight guide aligned perpendicular to the main axis, and the actuator is substantially along the main axis is movable. When the actuator is moved in a first actuation direction, the pressed parts pressed against the can contact surfaces; in a second The pressing parts are preferably moved by spring elements resettable or pressable to the actuating element.

Because of the relative movement between the actuator and the pressed parts also shift each other in normal planes contour lines of the main axis lying opposite Actuating area and the connecting areas. About clamping effects between the adjacent parts are to be prevented the radii of the contour lines are chosen so that in the entire area between the feed and the press position the radius of the external line is always larger or the same size as the radius of the inside line. So that when pressing Power transmission is optimal, are preferably in the area of Press position essentially the same radii are assigned to one another, and accordingly the areas are essentially dense to each other. The areas are in the area of the feed position essentially only along a straight generatrix to each other.

When using press-fit clamping rings, the friction movement significantly higher, and there is also a risk for non-round pressings. In addition, when using open Wrestling the only interruption essentially as big as the total of all interruptions between several if necessary provided pressed parts together. Even if at least two Press rings with mutually offset interruptions are provided the large interruptions can become unsightly connecting sections to lead.

The connection between the pressed contact surfaces is often caused by heating at least one on one Contact surface attached sealing layer achieved. Preferably the heat is supplied via the press surface. To do this, a good heat transfer from the pressing device to the contact surfaces or the pressing surfaces can be achieved. It has now shown that this is when using elastic rings cannot simply be guaranteed. An optimal heat flow is achieved with pressed parts in the form of ring parts. At least one heating element is preferably above one Thermally conductive body with a particularly normal to the main axis standing, large enough for the desired heat flow dimensioned, transfer area of the pressed part in Thermal contact. The heat flows in the press part without further contact transition directly to a partial area. It could if necessary, a heating element is connected to each pressed part will. However, a heating device is preferably provided, the one with a heating surface on the transfer surfaces of all Pressed parts connects, whereby the transfer surfaces at the movement of the pressed parts sliding along the heating surface move. To the press area each to the different Adjusting the box cross-sections is only necessary for the pressed parts be replaced, the heater remains on the Pressing device.

Press devices according to the invention can be in a wide variety Arrangements are used. Because of the optimal shaped and uninterrupted pressing surface can do the pressing at least in the case of sealed connections, usually without a counterpressing surface respectively. In the case of separating elements or can ends with contact surfaces, that lie on the inside or outside of the can jacket, pressing with a convex or concave pressing surface is sufficient from the inside or outside. The stability of the can wall is very high when pressing with a press surface of the same shape. The possibility of pressing without a counter pressing surface is a further advantage of the press device according to the invention and allows you to attach a can end, for example after attaching the other can end or one Separating membrane.

Fig.1a

einen Schnitt durch eine Pressvorrichtung mit von einer festen Stempelfläche geführten Pressteilen, wobei auf der linken Seite die Zuführlage und auf der rechten die Presslage dargestellt ist,

Fig.1b

eine Draufsicht auf die Pressteile,

Fig.2

einen Schnitt durch eine Pressvorrichtung mit an die Wärmeleitkörper geführten Pressteilen,

Fig.3

eine perspektivische Darstellung der Pressteile,

Fig.4

eine Draufsicht auf die Pressteile für eine ovale Dose,

Fig.5

eine Draufsicht auf die Pressteile für eine sechseckige Dose, und

Fig.6

einen Schnitt durch eine Pressvorrichtung zum Pressen von aussen.

Further details of the invention will become apparent from the following description of exemplary embodiments explained in the drawings. Show it:

Fig.1a

2 shows a section through a pressing device with pressing parts guided by a fixed stamp surface, the feeding position being shown on the left and the pressing position on the right.

Fig.1b

a top view of the pressed parts,

Fig. 2

2 shows a section through a pressing device with pressed parts guided to the heat-conducting body

Fig. 3

a perspective view of the pressed parts,

Fig. 4

a plan view of the pressed parts for an oval can,

Fig. 5

a plan view of the pressed parts for a hexagonal can, and

Fig. 6

a section through a pressing device for pressing from the outside.

1 comprises a pressing device according to the invention Pressed parts 30, each with a conical connection surface 31 on an actuating surface 32 of a conical actuating element 33 concerns. To ensure that the pads 31 always abut the actuating surface 32 a restoring means, preferably at least, for each pressing element 30 a return spring 34 assigned. The return springs 34 press the pressing elements 30 from one with a fixed, with Cartridges 51a equipped, holding part 35 held Thermally conductive body 36 radially against the actuating element 33. Die Press parts 30 are by movement of the actuating element 33 along an axis 37 movable radially to the axis 37. For Actuation is one by the holding part 35 and the Heat conducting body 36 guided actuating rod 38 with the Actuator 33 connected. To manage the Actuating rod 38 is particularly in the heat conducting body a slide bearing 36a is provided.

In order to guide the pressing part movement, the heat conducting body 36 Heating surfaces 39 arranged vertically to the axis 37, on the transfer surfaces 40 of the pressed parts 30 rest. The one from the Transmission surfaces 40 facing away from end surfaces 41 are of the Guided inside a fixed stamp surface 42. The stamp area 42 is via fastening parts 43a and spacers 43b, which pass through openings 43c of the pressed parts 30 with connected to the heat conducting body 36. Instead of the tour with the The stamp surface 42 can be guided, for example, according to FIG. 2 through radial guide slots 44 in the heat conducting body 36 and achieved by projections 45 of the pressing elements 30 guided therein will.

When feeding a cylindrical can 46 with one on the First contact surface 46a arranged on the inner surface of the can 46 there is, for example, a second one on this contact surface 46a cylindrical contact surface 47a of an inserted separating membrane 47 on. The can may be free in particular comprising a feed area, the end of a displaceable Centering ring 13 added and by moving the Centering ring guided over the pressed parts 30. The centering ring 13 is on the heat-conducting body and / or on guide pins 14 axially parallel and is guided by at least one compression spring 15 pressed away from the holding part 35. The bolts 14 are from one Washer 14a, which with screws 14b on the heat conducting body 36 is attached. The heat conductor 36 is with screws 48 on Holding part 35 attached.

In the inserted state, the contact surfaces 46a and 47a the pressing surface 49 formed by the pressed parts The contact surfaces 46a, 47a are pressed by the movement of the pressed parts 30 from the feed to the press position. Of the Centering ring 13 is optionally designed such that a Partial surface can be used as a counterpressing surface. To press To achieve a seal directly, the Heat conducting body 36 emitted heat from the heating surfaces 39 the transfer surfaces 40 to the pressing surface 49. The temperature Temperature of the heat sink is measured by a temperature sensor 50 measured and for controlling the supply of the heating cartridges 51a used. The supply takes place via feed lines 51.

The formation of the pressed parts 30 is shown in the top view in FIG Fig. 1b and the perspective view in Fig. 3 illustrates. In the illustrated embodiment, there are six pressed parts 30 assembled into a press ring. Here are each three pressed parts 30 alike. Close in the compilation alternately different pressed parts 30 on each other. The pressing surfaces 30a of the pressing parts 30 are in the circumferential direction bordered in a step-like manner, the one pressed parts on the one Page ascending and descending on the other side, the others Pressed parts adapted to it, vice versa ascending or descending Have levels 30b. Adjacent in the axial direction Levels of different pressed parts have in the shown Execution always an overlap. Through the axial movement of the actuating element 33, the pressed parts 30 become radial emotional; the overlap also varies. Because the radial Movement is very small, the breaks in Circumferential direction can be chosen very small. In Fig.3 they are shown exaggerated. Radial bores 34a are used for receiving the return springs 34.

In order to simplify the production of the pressed parts 30, this, as indicated on a press part of FIG. 3, from different large pane parts with partial areas 30 '. Instead of a fixed connection, the pane parts can if necessary, from a common management facility are each guided radially. It goes without saying that Various step shapes 30b adapted to one another are provided can be. By using a large number of steps the step height can be chosen very small. Instead of of six pressing parts 30 any one, preferably one Larger, and in particular an even number of pressed parts 30 be used.

Fig. 4 and Fig. 5 shows pressed parts 30 for pressing Cans with two semi-circular side areas and one straight central area or with a hexagonal cross section are trained. The pressed parts 30 close together adjacent steps 30b overlapping each other. The Press parts 30 are shown in a receiving position in which the steps 30b lie close together.

6 shows an example of a pressing device for pressing from the outside. On the holding part 35 with the heating cartridges 51a is a first and then a second heat conducting part 36a and 36b one Heat conductive body 36 attached. On the second heat conducting part 36b a radially protruding guide groove 52 is formed which in Guide slots 53 of partially annular press parts 30 fits. The guide slots 53 are open towards the axis 37 and together with the guide groove 52 form a radial guide in the pressing parts 30 are radially movable, but axially fixed.

The pressing surfaces 49 of the pressed parts 30 are against the inside Axis 37 directed. In order to press the pressing surfaces together Moving the contact surfaces of a can inwards includes the Pressed parts 30 outward conical connection surfaces 31 on an inwardly facing, conical actuating surface 32 of an annular actuating element 33 abut. To ensure that the connection surfaces 31 are always on the Actuate surface 32 abut each press element 30 Return means, preferably at least one return spring 34 assigned. The return springs 34 press the pressing elements 30 from the second heat conducting part 36b radially outwards against the Actuator 33. The pressing parts 30 are by one movement of the actuator 33 in the direction of the axis 37 movable radially to the axis 37. At least for actuation an actuating rod 38 'via a connecting device 56 connected to the actuator 33.

To ensure good heat transfer from the heat sink to the pressed parts 30 must be guaranteed on the first and on the second Heat conducting part 36a and 36b heating surfaces 39 are formed, to which Connect the transfer surfaces 40 of the pressed parts 30. If necessary, an ejection device is provided, which with an ejection surface 54 arranged between the pressed parts Makes cans ejectable. The ejection surface 54 is one Ejection rod 55 connected and by actuating the same movable in the direction of the axis 37.

The invention is not based on the illustrated embodiments limited. It is clear to the person skilled in the art that the External pressure in addition to circular, any concave Press surfaces, in particular press surfaces with oval and polygonal, preferably with hexagonal, cross sections can be used.

Claims (9)

Press device for tightly connecting a can wall (46) with a separating element (47) with at least two pressed parts (30), which together are arranged around an axis (37) Partial surfaces (30 '), existing, adjustable pressing surface (49) form, characterized in that the partial areas (30 ') each along a part of a circumferential line in one Plane which is essentially perpendicular to the axis (37), extend and the interruptions between partial surfaces (30 ') a first circumferential line with respect to the interruptions of a other circumferential line are offset in the circumferential direction, so that the pressing surface (49) has no continuous axis Has interruptions. Device according to claim 1, characterized in that the partial surfaces (30 ') are arranged in layers in the axial direction are, at least two, but preferably three Layers are provided and the partial surfaces (30 ') on one another subsequent layers overlapping in the circumferential direction are trained. Device according to claim 1 or 2, characterized in that that the adjoining partial surfaces (30 ') are different Layers of adjacent to each other in the axial direction Share, but preferably from both sides in the circumferential direction press parts (30) bordered in a step-like manner are formed, said steps (30b) being circumferential to each other adjoining pressed parts (30) fit into each other. Device according to one of claims 1 to 3, characterized in that that the pressed parts (30) are partially annular and essentially in one Straight guidance normal to the axis (37) (39.42; 44.45; 52.53) with its central area in the are mounted radially movable, the Degree of overlap of the partial surfaces (30 ') different Layers in the radial movement between the feed and The press position varies by matching the steps (30b) or layers of the pressed parts (30) more or less interlock. Device according to one of claims 1 to 4, characterized in that that for pressing from the inside or outside a convex or concave pressing surface (49) is provided, and preferably with a circular press surface Cross section of the outer radius of the convex or The inner radius of the concave pressed parts (30) is the same size as - or a little smaller or a little larger than - the radius of the pressing contact surface (46a, 47a), the from the Partial surfaces (30 ') formed pressing surface (49) in the overlap areas if necessary, a little inside or outside deviates from the circular shape, preferably in the press position but is essentially circular. Device according to one of claims 1 to 4, characterized characterized that for a pressure from the inside or outside Press parts (30) are provided, their common inwards or outward pressing surface (49) from planes Partial areas, preferably a part of Press parts (30) comprises two flat partial surfaces, which Connect the connecting edges to each other. Device according to one of claims 1 to 6, characterized in that that the pressing surface (49) at least partially is cylindrical and / or conical and optionally is adapted to a flanged can end. Device according to one of claims 1 to 7, characterized in that that at least one heating element with a preferably transmission surface normal to the main axis a pressed part (30) is in thermal contact, wherein preferably a heating surface (39) of a heat-conducting body (36) to the transfer surfaces (40) of all pressed parts (30) connects and the heating surface (39) as a guide surface for the movement of the pressed parts (30) serves. Device according to one of claims 1 to 8, characterized in that that an actuator movable in the axial direction (33) is provided, one around the axis (37) arranged conical actuating surface (32) on which conical contact surfaces (31) of the pressed parts (30) bear, whereby to achieve the desired radial movement of the pressed parts (30) guided radially and by means of restoring elements, in particular spring elements (34) against the actuating surface (32) can be pressed.

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