DE9007282U1 - Stackable barrel - Google Patents

Description

· I

Mauser-Werke GmbH " " -·*

04.04.1990

STACKABLE BARREL

The invention relates to a stackable barrel, preferably a large-volume barrel made of thermoplastic, e.g. PE (polyethylene) or steel, with an essentially cylindrical barrel wall and an upper and lower floor, in which a circumferential gripping ring (handling ring ) is provided on the outer barrel wall in the vicinity of at least the upper floor and in which at least one of the two disc-shaped flat barrel walls is connected to the outside over the barrel ring by a ring piece which is conically curved in cross-section in the axial direction to the outside.

Plastic bung barrels are generally known, the flat barrel bottoms of which are connected to the cylindrical barrel wall via an obliquely conical or rounded ring ³ , for example from the German utility model G -7 05 916. Since the rotating gripping rings in such barrels usually also take on the function of rolling tires,

^; : they extend essentially in a radial direction from the outer barrel wall; furthermore, there is a comparatively large axial projection of the barrel bottoms in the axial direction outwards or a considerable spacing of the barrel bottoms over the obliquely

! conical ring part of these gripping rings that protrude outwards. An axial force load on these gripping rings is - if at all - only possible to a very limited extent, as this would lead to the bending of the L-shaped rings that protrude radially from the barrel wall and to dents in the barrel walls. The

&iacgr;^&Ggr; The grip rings have no influence on the stackability of such barrels.

When stacking such barrels, the stack load is taken up exclusively after deformation of the conical or curved ring pieces of the flat barrel bottoms via a hydrostatic internal pressure build-up; the barrel shell is

The load is not directly applied in the axial direction or only after a deformation of the handling ring (see Figures 1 and 2).

Since barrels are generally transported and stacked on pallets and glass pallets usually do not have a flat support surface on the underside but rather two or three parallel, spaced-apart base boards, stacking does not normally result in even support forces on the top of the barrel stacked underneath.

Such a one-sided or uneven load can easily lead to one-sided yielding of the lower barrel and thus increases the risk of the stacked barrels tipping over sideways.

Furthermore, other large-volume bung barrels are generally known, in which the gripping rings are formed by an axial extension of the barrel wall or by retracted, recessed barrel bottoms. In such barrels, such as in a conventional steel barrel, the stack load is taken up exclusively by the rigid, stiff barrel casing. These barrels therefore have - if they are made of plastic - a relatively thick barrel casing that allows little or no elastic axial deformation; hydrostatic internal pressure is generally not built up in such a barrel. If internal pressure does develop, the flat barrel bottoms bulge outwards unhindered without being able to take on the function of partially supporting the stack load. In principle, it does not matter whether the barrel is empty or full and the bungs are tightly closed or open. A further disadvantage of such a barrel is a correspondingly high empty or operating weight.

It is therefore an object of the present invention to improve the stackability of large-volume drums and in particular

to improve long-term stacking behavior while simultaneously enabling savings in barrel material and reducing empty barrel weight.

This object is achieved according to the invention in that the height of the projection of at least one barrel bottom outwards over the associated barrel gripping ring is one to five times the wall thickness of the barrel wall. This design ensures that when barrels are stacked on top of one another in the barrel stacked underneath, wnl

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is firmly sealed in a gas-tight manner, in the upper residual gas space under the topsoil and in the filling medium, an internal hydrostatic pressure between 0.1 and 0.3 bar, preferably around 0.16 bar, is built up in a defined and reproducible manner by elastic flexibility of the topsoil and/or bottoms protruding outwards, before a reduced load is transferred to the outer edge of the barrel or handling ring.

Due to the design of the barrel according to the invention with an upper barrel ring and/or lower barrel ring formed in one piece from the barrel casing near the barrel end surfaces, which essentially represent an axial extension of the barrel casing. They protrude outwards in the axial direction relative to the axial end faces of the carrying and transport rings, whereby they are connected to the barrel casing via conical ring-shaped outer areas, a stack load is very advantageously taken up by the vertical barrel gripping rings, which are essentially formed axially to the barrel wall and have a flange edge that protrudes radially outwards, only after a pronounced, defined internal pressure build-up within the barrel. In this case, a defined hydrostatic internal pressure is first built up and only after a radial pre-stress is the axial load introduced into the barrel shell via the gripping rings, whereby the axial connection of the gripping rings distributes the effective stack load over a wider peripheral part of the barrel wall in the event of a point load. Due to the prevailing internal pressure

In addition, the risk of the barrel casing denting is shifted towards a higher axial load. This means that such barrels can take a much higher stack load and at the same time the risk of tipping over is significantly reduced. Furthermore, it is possible, for example with a given, estimable load for the barrel stacked underneath of around 90 kg in a triple barrel stack of 220 1-barrels, that the wall thickness of the barrel opening and thus the empty barrel weight can be reduced accordingly. In the case of a steel barrel, this makes it possible to use a steel sheet of 0.9 mm, for example, compared to a previous steel sheet with a wall thickness of 1.0 mm. The wall thickness of a plastic barrel can, for example, be reduced from 3.8 mm to 3.3 mm to 3.2 mm. This advantageously results in a reduction in the operating weight of an empty barrel of e.g. B. y.0 kg to approx. 8.5 kg and a saving in the plastic raw material.

The barrels according to the invention have a significantly better long-term stacking behavior than other known plastic barrels due to their utilized additional stabilizing internal pressure. Due to the axial pressure applied to the barrel bottoms and their support on the respective pallet bottoms, the barrel casing only needs to bear a reduced stacking load.

The invention is explained and described in more detail below using embodiments shown schematically in the drawings.

Show it:

Figure 1 a well-known plastic barrel with the top end extending high above the outer grip ring,

Figure 2 the known plastic barrel shown in Fig. 1 in the stacked load case,

Figure 3 another well-known barrel with an upper grip ring that protrudes far above the top,

Figure 4 shows the known barrel shown in Fig. 3 in the stacked load case,

Figure 5 shows a plastic bung drum according to the invention,

Figure 6 shows the plastic barrel shown in Fig. 5 in the load case stacked underneath,

Figure 7 shows a section of a barrel according to the invention in a state of increasing load,

Figure 8 shows the barrel shown in Figure 7 in the final state of a stacked load,

Figure 9 shows another lidded barrel according to the invention and

Figure 10 shows the lidded drum shown in Fig. 9 in the bottom-stacked load case.

In Figure 1, the reference number 10 designates the barrel casing of a generally known, comparatively thin-walled plastic barrel, in which the upper base 12 of the barrel is connected to the barrel casing 10 via an obliquely conical ring piece 14. In the transition area from the conical ring piece to the barrel casing 10, a circumferential upper gripping ring 16 with an L-shaped cross section is arranged. The barrel is filled with a liquid (filling material) 18 approximately up to the height of the gripping ring 16, with a gas space 20 remaining below the upper base 12 which projects high above the outer gripping ring 16.

In the loading case shown in Figure 2 for this known barrel, an internal pressure build-up occurs in the gas space 20 and the liquid 18 filled in by sinking the top 12. An axial load on the grip ring 16 is not normally provided for. However, as soon as an axial load on the grip ring sets in due to increasing load or deformation of the top - in practice this usually does not occur evenly, but mostly partially or on one side, for example due to a narrow pallet bottom board - the grip ring cannot absorb axial forces or transmit them to the barrel wall, but bends outwards or downwards and leads in this area to premature dents 22 in the barrel casing and thus to an increased risk of the barrel tipping over.

corresponding barrel stack. After the load is removed, this handling ring is no longer safe and manageable.

Figure 3 shows another previously known barrel made of comparatively thick-walled plastic. In this case, the upper hoop ring 24 extends far in the axial direction in extension of the barrel wall 28 beyond the barrel bottom 26.

As can be seen from Figure 4, with this barrel an axial stacking load can only be introduced via the upper face of the gripping ring barrel and absorbed by the barrel wall 28. If the load is too high, a radial expansion of the gripping ring 24 and compression of the barrel body can occur due to static deformation. As a result, when internal pressure builds up, the barrel top 26 (and bottom) bulges outwards without external resistance (no stacking load). Such barrels made of thick-walled plastic are expensive because they require a lot of material and have a high operating weight.

A bung barrel according to the invention with a comparatively thin-walled, essentially cylindrical plastic barrel wall 30, top 32 and bottom 34 is shown in Figure 5. A molded-in filling/emptying bung 36 is arranged in the edge area of the flat top 32. An upper gripping ring 38 and a lower gripping ring 40 are provided in the vicinity of the barrel wall 30. The barrel top 32 and the barrel bottom 34 are connected to the barrel casing via a conical ring piece 42, 44. This results in a circumferential free space 46 behind the gripping rings 38, 40 for the engagement of the claws of a corresponding barrel gripper or a crane hook. The essential feature of the invention is that in the barrel according to the invention the upper and/or lower barrel bottom 32,34 protrude beyond the front surface 48,50 of the respective gripping ring 38,40. In the barrel embodiment shown in Fig. 5, the projection 52 of the upper barrel bottom 32 over the upper gripping ring is

ring 38 and the projection 54 of the lower barrel bottom 34 *' · over the lower gripping ring 40 is approximately twice as much as the wall thickness of the barrel wall 30.

In Figure 6, the loading case of the drum according to the invention is shown schematically by a pallet 56 placed on top, which exerts a compression force on the drum with a stack load P. Due to the drum base design protruding by a certain amount, a defined, reproducible internal pressure P of approximately 0.16 bar is built up within the filled and tightly closed drum, so that the axial loading of the drum casing 30 only takes place after a radial pre-stress. This advantageously provides a superposition of partially compensating axial and tangential tensile stresses and axial compression forces.

Figures 7 and 8 illustrate another positive effect. When a load is applied (Fig. 7) - e.g. by a stacked barrel - and the top 32 is compressed with the beginning of elastic deformation of the conical lid ring piece 42, an additional stabilizing pressure force in the radial direction, indicated by arrow 58, acts from the inside on the barrel casing in the connection area 60 between the barrel casing 30 or upper gripping ring 38 and the lid ring piece 42. In the case of a larger load, e.g. by two stacked barrels (Fig. 8), a significant part of the compression force is introduced into the barrel wall in the axial direction via the front edge 48 of the upper gripping rings 38. Due to the prevailing internal pressure P. and the additional stabilizing pressure force from the lid ring piece 42 - both of which counteract any denting or buckling of the barrel casing inwards - the stacking properties and in particular the long-term stacking behavior of the barrel according to the invention are significantly improved. Due to the internal pressure applied to the barrel bottoms and their support on the pallet bottoms, the barrel casing only needs a considerably

reduced stack load, resulting in a
Material fatigue, ageing or decreasing long-term rigidity with loss of strength as with conventional
Plastic barrels do not appear at all or only much later.

Another embodiment of an inventive

sen barrel is in the form of a lidded barrel (Weithali d

container) shown in Figure 3 and Figure 10. Here 3

the upper grip ring 38 in the peripheral area of the barrel cover |

62. The barrel lid 62 rests with its '$

lower ! catch flange 64 on a from the outer &Ggr;_ ^&Ggr; - |

wall 30 projecting jacket flange 66. The upper |

Edge of the barrel casing 30 grip: in a U-shaped recess ^

tion in the barrel de^el 62, in which a sealing ring _;

68 is arranged. By means of a cover flange 64 ; and the jacket flange 66 simultaneously overlapping

The cover 62 can be pre-tensioned to ensure that it is gas- and liquid-tight ■: on the barrel opening or barrel wall
and can be closed tightly.

In the unloaded case (Fig. 9) the surface of the
barrel lid 62 has a projection 52 of approximately three times

Wall thickness of the lid or barrel jacket over the front,,

edge 48 of the upper grip ring 38. In the case of load
(Fig. 10) the cover 62 is raised by the height of the projection
pressed inwards so that the internal pressure P.
in the barrel and axial compression forces from the
upper gripping ring 38 via the cover flange 64 and the material flange 66 in the axial direction in the barrel casing 30. In the vicinity 72 of the flat cover surface, the conical ring part 42 has a defined crumple zone, e.g. formed by a circumferential groove profile, which determines the elasticity or flexibility of the
Barrel lid improved in this area.

Here too, the internal overpressure causes the barrel shell to stiffen, so that this lidded barrel can also be
its special structural design provides better

Stacking properties or improved behavior.

Due to the large support diameter (equal to the diameter of the gripping ring 38), there is a better distribution of compression force in the barrel wall, less overall deformation and greater lateral stability.

In a modification of the requirements, the barrel gripping rings could also be, for example, as separate prefabricated ring pieces, slipped, shrunk, glued or/and welded onto the outer barrel casing.

Furthermore, the barrel design according to the invention can also be implemented in a bung barrel by having the entire top and bottom with the respective gripping ring prefabricated as a separate individual part (e.g. injection-molded part) and then welded to the barrel casing.

The increase in stackability, in particular long-term stackability, of large-volume barrels with at least one circumferential barrel gripping ring arranged in the vicinity of the corresponding barrel bottom on the outer barrel wall and at least one barrel bottom protruding outwards in the axial direction beyond the barrel gripping ring is functionally achieved by the fact that when barrels are stacked on top of one another, in the lower gas-tight barrels, an internal hydrostatic pressure of between 0.1 and 0.3 bar, preferably around 0.6 bar, is initially built up in the remaining residual gas space and in the filling medium or liquid by elastic flexibility of the upper bottom and/or the lower bottom, before a vertical stack load is introduced into the barrel wall via the outer barrel edge or gripping ring, thus achieving improved stacking behavior, in particular long-term stacking behavior. In the case of point loading of the rotating grip ring, which is designed in axial direction as an extension of the barrel wall, the stacking load that occurs is advantageously distributed over a larger circumferential area of the barrel wall.

List of reference symbols

10 Barrel jacket 12 Barrel topsoil 14 conical ring piece 16 upper grip ring 18 liquid 2l Gas room 22 Denting 24 upper grip ring 26 Barrel bottom 28 Barrel wall 30 Plastic barrel wall 32 Topsoil 34 Underbody 36 Filling/emptying track, d 38 upper grip ring 40 lower grip ring 42 upper conical ring piece 44 lower conical ring piece 46 free space 48 Front face 38 50 Front face 40 52 Overhang 32/48 54 Overhang 34/50 56 palette 58 Arrow pressure force 60 Connection area 42/30/38 62 Barrel lid 64 Cover flange 62 66 Shell flange 30 68 Sealing ring 70 Clamping ring (metal) 72 crumple zone 74 Flange edge 38 75 Ring part 38 76 Gas room P
S Stacking load P. Internal pressure

Claims (7)

Mauser-Werke GmbH " « U4.U4.199U 1) Large-volume, stackable barrel with a substantially cylindrical barrel wall and upper and lower barrel base, in which a circumferential gripping ring (handling ring) is provided on the outer barrel wall in the vicinity of at least the upper base and in which at least one of the two disc-shaped barrel bases is connected to the barrel wall via a ring piece which, when viewed in cross section, is almost conical or curved and projects outwards in the axial direction, d π characterized in that the height of the projection (52, 54) of at least one barrel buoy over the gripping ring (38, 40) is one to five times the wall thickness of the barrel cover (30) or the barrel bottom (32, 34), whereby when the barrel is stacked, at least one of the conically outwardly projecting ring pieces (42, 44) of the upper bottom (32) and/or the lower bottom (34) is elastically deformable to such an extent that a supporting hydrostatic pressure can initially be built up inside the barrel before the stack load can be introduced into the outer barrel wall (30) via the outer gripping ring (38, 40) or barrel edge. (Fig. 5, 6) 2) Barrel according to claim I ₁ characterized in that only an elastically deformable ring piece (42) is provided on the upper barrel base (32) and an upper barrel gripping ring (38) is provided as an extension of the essentially cylindrical barrel wall (30), and the lower base (34) is flush with the lower barrel gripping ring (40) or essentially merges directly into the barrel wall (30). (Fig. 7,8) 3) Barrel according to claim 1 or 2, characterized in that the height of the projection (52) of the upper barrel bottom (32) over the upper barrel gripping ring (38) is approximately three to four times the turning strength of the foot wall (30) or the barrel top (32), 4) Barrel according to claim I ₁ characterized in that the projection (52) of the upper bottom (32) over the upper barrel gripping ring (38) is approximately three times and the projection of the lower bottom (34) over the lower barrel gripping ring (40) is approximately one to two times the barrel wall thickness (30). 5) Barrel according to claim I ₁ 2, 3 or 4
characterized in that the almost conical ring part (42, 44), which determines the height of the projection (52, 54) of the barrel bottom (32, 34) above the barrel gripping ring (38, 40), is designed as an elastically deformable crumple zone, e.g. with circumferential ring groove profiles. (Pig. 10) 6) Barrel according to claim ₁ 1 2, 3, 4 or 5, characterized in that the gripping ring (38) is formed by a ring piece (75) running essentially in the axial direction, in extension of the barrel wall (30), with a flange edge (74) pointing radially outwards, whereby a wedge-shaped free space (46) is formed between the inner surface of the ring piece (75) of the gripping ring (38) and the conical ring piece (42, 44) of the barrel bottom (32, 34) when viewed in cross section. (Fig. 5, 6, 7, 8, 9, 10) 7) Barrel according to one of the preceding claims 1 to 6, characterized in that the upper edge of the bung (36) is the same height as or flush with the outer surface of the upper barrel base (32) or is recessed slightly deeper. (Fig. 5)