JP3016857B2 - Stackable barrels - Google Patents

Description

The present invention relates to a large-volume stackable barrel, in particular a large-volume barrel made of thermoplastic, for example polyethylene or steel, comprising a substantially cylindrical barrel wall and an upper barrel bottom. And a lower barrel bottom, and an annular grip ring (handling ring) is provided on an outer barrel wall at least in a range close to the upper barrel bottom, and a plate-shaped flat At least one of the barrel bottoms is connected to the barrel wall via an annular portion projecting beyond the grip ring axially outwardly in a substantially conical or dome-like shape in cross section. The height of the protruding portion from which the barrel bottom projects beyond the grip ring is 1 to 5 times the thickness of the barrel wall or the barrel bottom.

In the commonly known plastic stoppered barrels, the upper and lower flat barrel bottoms are connected to the cylindrical barrel wall via an oblique conical annular part or a round chamfered annular part. (For example, German Utility Model No.
8705916). In such barrels, the annular grip ring usually also assumes the role of a rolling ring, so that the grip ring extends in a substantially radial direction so as to protrude from the outer barrel wall. Furthermore, the barrel bottom projects relatively largely axially outward, or the barrel bottom is arranged at a considerable distance from the outwardly protruding grip ring via an obliquely conical annular portion. The axial load on the grip ring is in any case only possible to a very limited extent. This is because this results in bending of the L-shaped ring that protrudes radially from the barrel wall and indentation of the barrel wall. The grip ring has no effect on the stacking ability of such barrels.

During such stacking of the barrels, the absorption of the stacking load by the hydrostatic internal pressure build-up only takes place after the deformation of the conical or dome-shaped annular section of the flat barrel bottom. That is, in this case, the barrel wall is not loaded directly in the axial direction or only after deformation of the grip ring for handling (first).
And FIG. 2).

Barrels are generally transported and stacked on pallets, and the lower surface of the pallets usually has no flat mounting surface and only two or three spaced-apart parallel bottom plates Therefore, during a standard stacking, no uniform loading force is produced on the upper bottom of the lower barrel.

Due to the one-sided or non-uniform load thus formed, only one side of the lower barrel is liable to bend, and therefore, the risk of lateral overturn of the stacked barrel layers is increased.

Furthermore, in another commonly known large-volume stoppered barrel, the grip ring is extended by the barrel wall being axially extended or the barrel bottom being retracted, i.e., sunk. It is configured. In such barrels, for example, even in the case of general-purpose steel barrels, the absorption of the stacking load is performed only by the rigid barrel peripheral wall. Thus, these barrels have a relatively thick barrel perimeter (if they are made of plastic), and such thick perimeter walls allow little or no elastic deformation in the axial direction. Such a barrel generally does not create a hydrostatic internal pressure. Nevertheless, when an internal pressure builds up, the flat barrel bottom bulges outward without hindrance, but in this case it cannot assume the partial support function of the stacking load. In this case, it does not matter in principle whether the barrel is empty or filled, and whether the closure is tightly closed or open. Therefore, another disadvantage of such barrels is a correspondingly high empty or used weight.

It is therefore an object of the present invention to improve the stacking capacity of large-volume barrels, in particular the long-term stacking properties, while at the same time enabling the saving of barrel material and the reduction of empty barrel weight.

In order to solve this problem, in the configuration of the present invention, the height of the protruding portion where at least one barrel bottom projects outward beyond the corresponding grip ring is 1 to 5 times the wall thickness of the barrel wall.
It was made to correspond to double. With such a configuration, when a plurality of casks are stacked one above the other, the lower casks which are filled with a filling medium (for example, liquid) and are gas-tightly closed are formed below the upper bottom. In the upper residual gas chamber and in the filling medium, a hydrostatic pressure of 0.1 to 0.3 bar, preferably of about 0.16 bar, is initially based on the elastic flexibility of the outwardly projecting upper and / or lower bottom. The internal pressure is created exactly and reproducibly, so that a reduced stacking load is introduced at the outer edge of the barrel or at the grip ring for handling.

In the keg according to the invention, an upper keg ring and / or a lower keg ring integrally formed from the keg peripheral wall are provided near the keg end face, these keg rings being substantially axial extensions of the keg peripheral wall. Further, a flat upper bottom portion and a lower bottom portion are provided, and these bottom portions project outward in the axial direction with respect to the axial end surface of the support / conveyance ring. In this case, the bottom is connected to the barrel wall via a conical annular outer region. Due to such a configuration, the stacked load absorption in a vertical grip ring, which is arranged substantially axially with respect to the barrel wall, with a radially outwardly projecting flange edge, is defined within the barrel. This is extremely advantageous because it is performed only after the internal pressure is formed. In this case, a defined hydrostatic internal pressure is first established, and then, after a radial preload, an axial load is only introduced into the barrel wall via the grip ring. In this case, due to the axial connection of the grip rings, in the case of a point load, the acting stacking load is distributed over a relatively wide circumferential portion of the barrel wall. Furthermore, due to the pre-formed internal pressure, the danger of dents in the barrel wall is shifted towards higher axial loads. That is, such barrels
The stacking load significantly higher than that of the conventional one can be received, and at the same time, the danger of falling is considerably reduced. In addition, for example, if three barrels of 220 liters are stacked and a specified load of about 900 kg is estimated for the lower barrel, the wall thickness of the barrel wall, and thus the empty weight of the barrel, is reduced accordingly. Can be done. This makes it possible to use, for example, a 0.9 mm steel sheet for a conventional steel sheet having a wall thickness of 1.0 mm in a steel barrel. The thickness of the plastic barrel can be reduced, for example, from 3.8 mm to 3.3-3.2 mm. This leads to a reduction in the weight of empty barrels used, for example from 9.0 kg to about 8.5 kg, and a savings in material for plastic raw materials.

The kegs according to the invention have long-term stacking properties which are much more favorable than other known plastic casks due to the use of internal pressure with an additional stabilizing effect. Due to the fact that the barrel bottom is axially loaded and supported on each pallet bottom, the barrel wall only has to support the reduced stacking load.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a known plastic barrel with an upper bottom projecting far beyond the outer grip ring, and FIG. 2 shows the known plastic barrel shown in FIG. FIG. 3 shows another known barrel with an upper grip ring projecting far beyond the upper bottom, FIG. Fig. 5 shows the known barrel shown in Fig. 3 in a loaded state when it is positioned at a lower position during stacking; Fig. 5 shows a barrel with a plastic stopper according to the present invention; FIG. 7 shows the plastic barrel shown in FIG. 5 in a load state when the barrel is positioned at a lower position during stacking. FIG. 7 shows a part of the barrel according to the present invention in an increased load state. FIG. 8 shows that the barrels shown in FIG. 9 shows another keg with a cover according to the present invention, and FIG. 10 shows the keg with a cover shown in FIG. Are shown in the load state when the vehicle is located at the position.

FIG. 1 shows the barrel wall of a generally known plastic barrel with the reference numeral 10 which is relatively thin. In this known plastic barrel, the upper bottom 12 of the barrel is connected to the barrel wall 10 via an oblique conical annular portion 14. An annular upper grip ring 16 having an L-shaped cross section is arranged in a transition area from the conical annular portion 14 to the barrel peripheral wall 10. This barrel is filled with liquid (filling material) almost to the level of the grip ring 16, in which case a gas chamber 20 is provided below the upper bottom 12, which protrudes higher than the outer grip ring 16. It remains free.

FIG. 2 shows a state in which the known barrel is loaded. In this case, internal pressure builds up in the gas chamber 20 and the filled liquid 18 due to the sinking of the upper bottom 12. The axial load of the grip ring 16 is not taken into account in the normal case. However, as soon as the load or deformation of the upper bottom increases and the axial load of the grip ring begins, this is not actually uniform, but rather, for example, based on a narrow pallet lower bottom plate, which is mostly partially or The grip ring cannot receive the axial force or be able to introduce this axial force into the barrel wall and bend outwards or downwards and in this area Of the barrel surrounding wall will be accelerated. This increases the risk of the corresponding barrel stack falling over. After unloading, the handling grip ring is no longer secure and inoperable.

FIG. 3 shows another known barrel of comparable thin plastics. The upper grip ring 24 projects axially far beyond the upper bottom 26 by extension of the barrel wall 28.

As can be seen from FIG. 4, in this known barrel the axial stacking load is introduced only via the upper end face of the grip ring and is received by the barrel wall 28. If the load is excessively increased, the grip ring 24 expands in the radial direction due to elastic deformation, and the barrel body is compressed. As a result, the upper bottom 26 (and the lower bottom) of the keg bulges outward without external resistance (without the support of the stacking load) when the internal pressure builds. Such barrels made of thin plastic are expensive in terms of material costs and have a high working weight.

FIG. 5 shows a stoppered barrel according to the invention with a barrel wall 30 of substantially cylindrical and comparable thin plastics, an upper bottom 32 and a lower bottom 34. In the peripheral region of the flat upper bottom portion 32, a filling / discharging plug body 36 formed and processed is arranged. An upper grip ring 38 and a lower grip ring 40 are provided in a range near the barrel wall 30. The upper bottom portion 32 and the lower bottom portion 34 of the barrel are connected to the barrel peripheral wall via conical annular portions 42,44.
This forms behind the grip rings 38, 40 an annular gap 46 for engaging a claw provided on a suitable barrel gripper or crane hook. An important feature of the present invention is that in the barrel according to the present invention the upper bottom 32 and / or the lower bottom 34 is
That is, it protrudes beyond 8,50. In the barrel embodiment shown in FIG. 5, the height of the protrusion 52 of the upper bottom 32 from the upper grip ring 38 and the height of the protrusion 54 of the lower bottom 34 from the lower grip ring 40 are equal. , Almost twice the thickness of the barrel wall 30.

FIG. 6 shows a pallet on which a barrel according to the invention is placed.
The state loaded by 56 is shown. The pallet is applying a compressive force to the barrel in a stacked load P _s. Based on the barrel bottom configuration projecting by the specified dimensions, the interior of the tightly closed barrel filled with filling is approximately 0.16
Because exactly reproducible pressure P _i of the bar is formed only after the applied preload in the radial direction, the axial load Tarukabe 30 is not performed. This advantageously results in a superposition of the axial and tangential tensile stresses, which partially compensate each other, and the axial compressive forces.

7 and 8 show another advantageous effect. For example, when a load is introduced by a stacked barrel and the upper bottom 32 is compressed with the start of elastic deformation of the conical annular portion 42 for the cover, the barrel wall 30 or the upper grip ring 38 and Annulus 42 for cover
In the direction along the radial plane up to the coupling range 60 between
A pressing force with an additional stabilizing action acts (arrow 58).
reference). For example, in the case of a relatively large load when two barrels are stacked (FIG. 8), most of the compressive force is
It is introduced axially into the barrel wall via an edge 48 of the upper grip ring 38. Based on the internal pressure P _i formed and the additional stabilizing pressing force obtained from the cover ring 42 (both preventing the barrel wall from indenting or folding), The stacking properties of the barrel according to the invention, in particular the long-term stacking properties, are significantly improved. Since the barrel bottom is loaded with internal pressure and supported on the pallet bottom, the barrel wall only needs to receive a significantly reduced stacking load. Thus, unlike general-purpose plastic casks, there is no or only long-term loss of shape rigidity over time with material fatigue, aging or loss of strength.

9 and 10, another embodiment of the keg according to the invention is shown in the form of a covered keg (wide-mouth keg). The upper grip ring 38 is arranged in the outer peripheral area of the barrel cover 62. The lower circumferential flange 64 of the barrel cover 62 is supported by a circumferential wall flange 66 protruding from the outer barrel wall 30. The upper edge of the barrel wall 30 is engaged with a U-shaped notch provided in the barrel cover 62, and this notch includes a seal ring.
68 are located. A clamping ring 70, which simultaneously covers the circumferential flange 64 and the peripheral wall flange 66 of the cover, allows the barrel cover 62 to be gas-tight and liquid-tight and tightly closeable to the barrel opening or barrel wall.

When unloaded (FIG. 9), the surface of the barrel cover 62 has a projection 52 from the end 48 of the upper grip ring 38 which is approximately three times the thickness of the cover or barrel wall. . When a load is applied (FIG. 10), the barrel cover 62 is pushed inward by the height of the protruding portion, so that an internal pressure _Pi is formed in the barrel and the axial compressive force is reduced by the upper grip ring 38. Can be introduced into the barrel peripheral wall 30 in the axial direction via the cover flange 64 and the peripheral wall flange 66. In the area 72 close to the flat cover surface, the conical annular portion 42 has a defined crash zone, constituted for example by an annular groove formation. This crush zone improves the elasticity or flexibility of the barrel cover in this area. Also in this case, since the barrel surrounding wall is reinforced by the internal positive pressure, the barrel with the cover also has a special structural configuration,
It also has better stacking properties or improved long-term stacking properties.

Large support diameter (equal to the diameter of grip ring 38)
As a result, a good compression force distribution on the barrel wall, a relatively small overall deformation and a relatively high lateral stability are obtained.

In a variant of the invention, the grip ring may be mounted, for example as a separate pre-fabricated annular part, on the outer peripheral wall of the keg, by shrinking, crimping, gluing and / or welding.

Further, the configuration of the barrel according to the present invention in a stoppered barrel,
It can also be realized by prefabricating the upper or lower bottom, each provided with a grip ring, as a whole as a separate individual part (eg an injection-molded part) and subsequently welding it to the cylindrical barrel wall.

Stacking capacity of large-capacity barrels with at least one annular grip ring arranged on the outer barrel wall in the area close to the corresponding barrel bottom, and a bottom protruding axially outward beyond this grip ring; In particular, the improvement of the stacking ability for a long time can be functionally obtained as follows. That is,
As the casks are stacked one on top of the other, the remaining residual gas chambers and the filling medium or liquid are first added to the elastic flexibility of the upper and / or lower bottom in the gas-tight closed lower casks. Based on 0.1-0.3 bar, advantageously about 0.
A 16 bar hydrostatic internal pressure is established, from which a vertical stacking load is introduced into the barrel wall via the outer barrel edge or grip ring. Therefore,
Improved stacking characteristics, especially long-time stacking characteristics, can be obtained. When an annular grip ring configured as an extension of the barrel wall in the axial direction is loaded in a point-like manner,
The resulting stacking load is distributed over a relatively large circumferential area of the barrel wall.

Continuation of the front page (56) References JP-A-61-9935 (JP, A) JP-A-64-23446 (JP, U) JP-A-62-28336 (JP, U)

Claims (6)

(57) [Claims] 1. A large volume stackable barrel made of thermoplastic, comprising a substantially cylindrical barrel wall (30), an upper barrel bottom (32), and a lower barrel bottom (34). Is provided, at least in a range near the upper barrel bottom (32),
An annular grip ring (38) (handling ring) is provided on the outer barrel wall (30), and at least one of the plate-shaped barrel bottoms (32, 34) is substantially conical in cross section. Connected to the barrel wall (30) via an annular portion (42, 44) projecting beyond the upper edge of the grip ring (38) in the shape of a dome or axially outward, and at least one barrel. The bottom (32; 34) is the grip ring (38,40)
The height of the protruding parts (52, 54) protruding beyond
0) or 1 to 5 times the thickness of the barrel bottom (32, 34), and when a stacked load is applied to the barrel in a state where the barrel is filled, deformation of the conical or dome-shaped annular portion is caused. In the type in which internal pressure build-up is provided, when a stacked load is applied to the barrel, the barrel is provided on the upper barrel bottom (32) and / or the lower barrel bottom (34). Said conical outwardly projecting annular portions (42,44) are elastically deformed, in this case firstly 0.1 to 0.3 bar, preferably about
Hydrostatic with a supporting action of 0.16 bar,
That is, a hydrostatic internal pressure is formed, after which the stacking load is applied via the outer grip rings (38, 40) formed substantially on the axial extension of the barrel wall (30). Stackable barrels, characterized in that they are introduced in 30). 2. An elastically deformable annular portion (42) and an upper grip ring (38) located on the extension of the substantially cylindrical barrel wall (30) only at the upper barrel bottom (32). Provided, wherein the lower barrel bottom (34) is configured flush with the lower grip ring (40) or transitions almost directly to the barrel wall (30). Item 1. The barrel according to Item 1. 3. The height of the projecting portion (52) from which the upper barrel bottom (32) projects beyond the upper grip ring (38) is the meat of the barrel wall (30) or the upper barrel bottom (32). 3. The barrel according to claim 1, wherein the barrel corresponds to approximately three to four times the thickness. 4. The height of a protruding portion (52) from which the upper barrel bottom (32) projects beyond the upper grip ring (38) corresponds to approximately three times the thickness of the barrel wall (32). The height of the projecting portion where the lower barrel bottom (34) projects beyond the lower grip ring (40) is approximately 1 to 2 times the wall thickness of the barrel wall (30).
2. The barrel according to claim 1, wherein the barrel is doubled. 5. Both barrel bottoms (32, 34) are provided with both grip rings (3
A substantially conical annular portion (42,44) defining the height of the protruding portion (52,54) projecting beyond (8,40) is configured as an elastically deformable crush zone, (36) whether the upper edge is formed at the same height as the outer surface of the upper barrel bottom (32), that is, in the same plane as the outer side;
5. The barrel according to claim 1, wherein the barrel is configured to be slightly lowered. 6. The grip ring (38) is constituted by an annular piece (75) extending substantially in the axial direction and extending from the barrel wall (30), said annular piece comprising a radially outwardly directed flange edge. Part (74), said grip ring (38)
A wedge-shaped gap (46) is formed between the inner surface of the annular piece (75) and the conical annular portion (42, 44) of the barrel bottom (32, 34). The barrel according to any one of claims 1 to 5, wherein