KR101994281B1 - Pallet container - Google Patents

Abstract

The present invention has a lattice-profile supporting casing (14) having a thin walled inner container (12) made of a thermoplastic material for storage and transportation of liquid or fluid contents and tightly enclosing said inner container (12) as a supporting casing , A base pallet (16) having an inner container (12) on said base pallet (16), said grid-profile supporting casing (14) being rigidly connected to said base pallet Profile supporting casing 14 comprises intersecting vertical and horizontal profile bars 20,22 which are joined by mechanical bonding such as clinching or punch riveting to their intersections < RTI ID = 0.0 >Lt; / RTI >
The profile bars 20 and 22 are additionally fixed in a rotationally fastening manner at their connection points 18, 24 and 26 through mechanical formations 42 and 43 or form-fit- do.

Description

PALLET CONTAINER {PALLET CONTAINER}

The present invention relates to a thin-walled rigid inner container made of a thermoplastic material for the storage and transport of liquid or free-flowing contents, as a support casing closely enclosing the inner container ) Grid frame, and a base pallet, said inner container resting on said base pallet, said grid frame being fixed to said base pallet, said grid frame comprising vertical and / And horizontal profile bars.

Pallet containers are used for transport and storage of liquid, or fluid, and in some cases toxic, contents. In the transportation of filled pallet containers, particularly in the case of contents with a relatively high density, and when the pallet containers are stacked, during transport by rail or by sea, or by trucks with a stiff suspension, - On a bad road surface - Grid frames are subjected to considerable loads. When the pallet container is stacked, this transport-induced load due to the lamination load causes the lattice frame to undergo axial compressive loading and, as a result of sustained dynamic surge movements expressed from the liquid contents, The grating frame is additionally subjected to reversed bending loading in a radial direction. The welding areas of weld joints, or lattice tubes or intersections of vertical and horizontal grid bars, are subjected to the highest stresses. This stress induces rupture of the weld joints or the grid tubes after a certain period of time, which means that the level of reliability required to stack and transport these pallet containers is no longer guaranteed.

All known pallet containers with tubular lattice frames have weld connections at the intersections of the tubular bars; In the case of some pallet containers, a limited degree of resilient bending points are formed in the vicinity of the weld spots of the tubular bars, in order to releasing the load of the weld zones.

Pallet containers with welded tubular lattice frames are generally known, for example, from EP 0 734 967 A (Sch). The tube-type lattice frame of a known pallet container from this document includes a round-tube profile, which is indented to pronounced extent in the welded intersections, When they intersect, they form four contact points for mutual welding. Limitedly flexible bending points are created by the additional depressions of the welded hollow end regions.

EP 0 755 863 A1 (Fust) discloses another pallet container in which the gridding bars have a square-tube profile, which, as the square-tube profile is only partially pressed in the crossing area for better welding, To form four contact points. On the other hand, the tube profile has a constant cross-section without any concavities over its entire length between crossings.

DE 196 42 242 A1 (Rot) discloses another pallet container with a lattice frame made up of a constant profile and open trapezoidal profile bars over the length of each bar. Here, the four welding spots at the intersections are achieved by the outer flat surfaces of the profile bars.

Another pallet container having an overall continuous tube profile is known from US 6,244,453 B1 (Mam). Here, the four weld spots at the intersections of the bars are achieved by successive two-sided or four-sided square-profile recesses with longitudinally-directed ribs (ribs).

EP 1 289 852 (Mau) discloses another pallet container in which the grating bars have a trapezoidal tube profile and have four welding spots in the crossing area. Retreats acting as predetermined bending points are created in the area near the intersections of the tubular bars on the tube side opposite the weld zone.

Another pallet container with four welding spots in the crossing region of tubular bars is known from EP 1 618 047 B1 (Mau). Here, the elasticity behavior of the tubular lattice frame is achieved by reducing the cross-sectional height of the tubes between welded intersections or externally.

DE A 10 2010 033 738 1 (R.Bu) describes a special pallet container in which the metal cage is punched in the form of force-fitting and form- Characterized in that the profile bars of the metal cage are fixed by punch riveting, TOX clinching or straightforward clinching.

Another pallet container with clinched connections and spot-weld connections between the ends of the vertical profile bars of the upper horizontal profile bars and the lattice-profile supporting casings is known from DE A 2005 2005 031 940 (Sch) .

Disadvantages of the prior art

All of the tubular lattice frames known in the art, which have a generally uniform lattice-tube profile and have two or four weld spots at the intersections, are known to be susceptible to both horizontal and vertical tubular lattice bars encountering reversible bending stresses occurring during transport of the filled pallet containers So that it has a disadvantage that it is flexurally and torsionally rigid as a whole. Even after a relatively short stress period, this leads to fatigue cracks and rupture of the bars, especially near the welded intersections of the grating bars, causing the weld spots of the intersections to rupture and break.

In the case of double stacking of pallet containers, in particular the attachment point between the upper horizontal profile bar and the vertical profile bar is a weak point.

For example, it has welded round tubes with four weld spots known from EP 0 734 967 A2 (Sch), with a significantly reduced tube cross-sectional height in the region of intersections (no continuous tube profile) These tube-shaped lattice frames have a disadvantage that a considerable load peak occurs in these reduced tube cross-sectional areas, and as a result, the tube cross- For example, in the case of a drop test, an internal hydraulic test, and a reversible bending load due to a transport-induced load, for example, predetermined failure or buckling points are pre-programmed.

These known tubular lattice frames with four welding spots in the intersection area of the tubular bars and the preset bending points or preset bending points or preset bending points known from EP 1 289 852 and EP 1 618 047, It is not subjected to a load, and only the areas of the reduced tubular-bar cross-section have the disadvantage of absorbing the reversible bending stress due to the transport-induced load.

In principle, all tubular bars of the tubular lattice frames with predetermined bending points of the starting profile will have a larger dimension, since only the reduced tubular-bar cross-sectional height of the preset bending points absorbs the reversible bending stress. But it reduces the static loading capability of the tubular lattice frame as a whole.

All known pallet containers with welded wire grids as welded casing or welded tubular grating frames have the following disadvantages:

The welding method used is resistance welding, a simple welding method with a high level of energy consumption; All materials can not be welded by resistance welding, and sudden bending surge loading during long-term transportation can lead to rupture of weld seams.

Additional clinch connections and spot welds between the ends of the vertical profile bars of the top horizontal profile bars and the lattice-profile supporting casings known from, for example, DE 10 2005 031 940, which are far from those involving adverse spot- These tubular lattice frames with connections have no additional mechanical form-fit connections at the other intersections of the vertical and horizontal profile bars of the tubular lattice frame.

These known tubular lattice frames made of cage-forming bar profiles forming so-called jointed connections by punch riveting, toxic-clinching or simple clinching have the following disadvantages:

If the profiles used in the tubular lattice frame are conventional ones with a bar width of 15 to 25 mm, the size or dimensions of the joint connections can only realize the maximum of two joint connections or one joint connection at each intersection of the tubular lattice frame And these joint connections must absorb the same forces as in the case of a pallet container with a tubular grid frame with four welding spots and a continuous grid-tube profile at the intersections. When a lattice-tube profile made of a non-metallic material is used, the mechanical load-bearing capacity of the joint connection is reduced due to the poor physical properties of the non-metallic material.

It is an object of the present invention to provide a method and apparatus for a pallet container which no longer has the disadvantages of the prior art and which, in addition to the conventional sudden load induced by the liquid content in transportation, Profile support casing with a profile bar made out of a bar-type profile.

According to the invention, this object is achieved by a pallet container having the features of claim 1. Dependencies include advantageous and suitable developments of the invention.

A collapsible lattice-profile supporting casing having a lattice-profile supporting casing tightly surrounding an inner container as a supporting casing, said inner container having a base pallet on which the lattice-profile supporting casing is secured, and a rigid or collapsible lattice- The pallet container for liquids according to the present invention, including vertical and horizontal profile bars fixed to each other at intersections, is distinguished by the following advantages :

It is possible to connect profiles composed of materials which are not welded at all the connection positions of the lattice-profile supporting casing and which are connected by mechanical bonding and which are not capable of resistance welding, for example, steel, aluminum , The composite bars and the profile bars made of plastic can be interconnected, the joint area is not thermally affected in any way, and the mechanical joint is more cost-effective by having low levels of energy consumption. The profile bars may have different wall thicknesses and may be configured in the form of a bar profile, a shaped profile, or a hollow profile. Also, the mechanical splice connections are accessible on one side and can be created without any preliminary perforations. The mechanical joint connections have high dynamic load bearing capacity.

The profile bars may also be locked against each other at their intersections by mechanical shape fitting to provide lattice-profile crossing junctions of the upper and lower horizontal profile bars to relieve the load on the clinch or punch riveting joint connections As shown in Fig. In the case of mechanically spliced connections for every lattice-profile crossover junction, especially for foldable or folded lattice-profile supporting casings comprising separate side sections, this mechanical fit also enhances its design strength.

In the case of double stacking of pallet containers, the stacking load induced by the stacked pallet containers on top must be absorbed by the upper horizontal profile bars of the grid-profile supporting casing and transferred to the base pallets through the lower horizontal profile bars and the vertical profile bars . Punch rivets, clinch rivets, or clinch-joint connections are effectively mitigated by the additional bearing surfaces on the upper and lower lattice-profile crossing junctions.

In one embodiment of the invention, the grid-profile supporting casing of the pallet container may be of a folded or folded configuration. By having the same surface area at the base, the height of the pallet-container here is reduced to about 1/3 of the original height. An advantage of this configuration is that due to the reduced volume of the collapsed pallet container, the cost of storing the pallet container without the inner container inserted therein and the transportation cost can be significantly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be described and explained in more detail with reference to exemplary embodiments schematically represented in the figures:
1 is a front view of a pallet container according to the present invention;
2 is a side view of a pallet container according to the present invention,
Figure 3 illustrates a dual-stacked pallet container according to the present invention,
4 shows a lattice-profile intersection point (18 in FIG. 2) according to the present invention,
Figure 5 is a cross-sectional view taken along the line AB of Figure 4,
Figure 6 is a cross-sectional view of a CD cut at the lattice-profile intersection of Figure 4 with a mechanically bonded connection produced by clinching;
FIG. 7 is a cross-sectional view of another cross-section of a grid-profile from FIG. 4 having a mechanically bonded connection produced by punching using a semi-tubular rivet;
FIG. 8 is a cross-sectional view of a CD cut at another lattice-profile intersection from FIG. 4 with a mechanical splice connection produced by punching using a solid rivet,
Figure 9 is an EF cross-sectional view of the horizontal profile-bar bearing means from Figure 4 cut,
Figure 10 is an EF cross-sectional view through the horizontal profile-bar mount from Figure 4,
Figure 11 is an EF cross-sectional view through another horizontal profile-bar mount from Figure 4,
Figure 12 shows an upper lattice-profile cross junction (24 in Figure 2)
FIG. 13 is a diagram illustrating a standard profile-bar connection, an upper horizontal / vertical profile bar, according to section GH of FIG. 12,
Figure 14 is a view of a profile-bar connection, an upper horizontal / vertical profile bar according to the invention, according to section GH from Figure 12,
Figure 15 shows another profile-bar connection according to the invention, an upper horizontal / vertical profile bar, according to section GH from Figure 12,
Figure 16 shows another profile-bar connection according to the invention, an upper horizontal / vertical profile bar, according to section GH from Figure 12,
Figure 17 shows a grid-profile cross-junction (26 in Figure 2) according to the present invention at the bottom,
Figure 18 is a view showing a standard profile-bar connection, a lower horizontal / vertical profile bar, according to section IJ from Figure 17,
Figure 19 shows a profile-bar connection, a bottom horizontal / vertical profile bar according to the invention, according to section IJ from Figure 17,
Figure 20 shows another profile-bar connection according to the invention, a bottom horizontal / vertical profile bar, according to section IJ from Figure 17, and
Figure 21 is a view of another profile-bar connection, a lower horizontal / vertical profile bar according to the invention, according to section IJ from Figure 17;

Figure 1 shows a pallet container according to the present invention having a thin wall rigid inner container 12 made of a thermoplastic material and having a grid-profile supporting casing 14 and a base pallet 16 (pallet width 1000 mm) Fig. 2 is a side view of the pallet container 10 (pallet length 1200 mm).

Figure 3 shows a dual-stacked pallet container 10 according to the present invention. This type of lamination is common, for example, by truck transport or external cargo shipping containers according to ISO 668. In the case of a double laminate, the grid-profile supporting casing 14 of the pallet container 10 laminated below has not only the sudden force (radial load) induced by its contents, but also the weight of the stacked pallet container 10 (Axial load).

Figure 4 shows the lattice-profile intersection 18 of the lattice-profile supporting casing 14 according to the present invention formed by two U-shaped bar profiles 28 according to Figure 5 . Cross section CD from Figures 4, 12 and 17 shows horizontal and vertical profile bars 22,20 with mechanically bonded connections. Cross sections CD from Figs. 4, 12 and 17 are the same, and mechanical joint connections can be made according to Figs. 6, 7 and 8.

Figure 6 shows the mechanical joint connection between U-shaped vertical and horizontal profile bars 20,22 produced by clinching. The mechanical clinch connection is made by the material being pushed into and displaced into the clinch cavity region 30 of the horizontal profile bar 22 and by the material displaced therefrom by the clinch- This is accomplished by subsequent insertion and pressing operations. The advantage of these mechanical joints is that only low levels of energy are consumed and the junction area is not thermally affected in any way.

Figure 7 shows another mechanical joint connection between the U-shaped vertical and horizontal profile bars 20, 22 according to the present invention. The mechanical joint connection is made by a half-tubular rivet 34 which forms the half-tubular-rivet joint area 36 by punch riveting so that the vertical and horizontal profile bars 20,22 are permanently .

Another mechanical joint connection according to the present invention is a punch riveting method using a solid rivet 38, which is illustrated in Fig. The mechanical splicing connection between the profile bars 20,22 is created by the solid punch rivet 38 and by the displacement of the material into the splice area 40 of the solid punch rivet 38. [ Punch riveting using the solid rivet 38 is accomplished without preliminary drilling as well as punch riveting using the half-tubular rivet 34, and thus is easy to automate.

9, 10 and 11 show a horizontal profile bar 22 bearing on a vertical profile bar 20 at the lattice-profile intersection 18 of the lattice-profile supporting casing 14 according to the present invention. And the horizontal profile bar 22 is additionally shaped through the receiving groove 42 of Figure 10 or through the punched-out centering means 43 of Figure 11 into the vertical profile bars 20 - Fixed in a fitting manner.

Profile cross-junction of the top 24 of the lattice-profile supporting casing 14 according to the present invention is illustrated in Fig. 12 and is illustrated in cross-section CD of Figs. 6, 7 and 8, A mechanical clinch or punch riveting joint connection between the upper horizontal profile bar 22 and the vertical profile bar 20 can be made.

Figures 13 , 14 , 15 and 16 illustrate an upper horizontal profile bar 22 that is butted / held against a vertical profile bar 20 and the horizontal profile bar 22 is a shoulder of Figure 15, 44 or through the punch-out lower center setting means 43 of Fig. Figure 16 shows a modified U-shaped upper horizontal profile bar 22 with a bearing limb 45, which serves to support the vertical profile bar 20. [ Figure 13 shows the horizontal profile bars 22 held in the vertical profile bars 20 without any vertical support.

A cross-sectional view of the lattice-profile cross-point of the bottom portion 26 according to the present invention is illustrated in Figure 17, wherein a mechanical clinch or punch riveting joint connection between the horizontal profile bar 22 and the vertical profile bar 20 is shown in Figures 6, Are illustrated in cross section CD of Figs. 7 and 8.

Figures 18, 19, 20 and 21 illustrate a vertical profile bar 20 abutting / retaining a lower horizontal profile bar 22 which is additionally shown in Figure 19 as a punch-out shoulder 46, or is held in a T-shaped lower horizontal profile bar 22 having a bearing rim 47 in Fig. Figure 21 shows an L-shaped lower horizontal profile bar 22 having two bearing areas 48, which serve to support the vertical profile bars 20. 18 shows a horizontal profile bar 22 abutting the vertical profile bars 20 without any additional vertical support for the vertical profile bars 20. Fig.

Reference number list

10 Pallet container

12 Inner container

14 Grating-profile supporting casing

16 Base Palette

18 Grid-profile intersection

20 Vertical Profile Bar

22 Horizontal profile bar

24 Top Grid-Profile Crossing Junction

26 Lowermost Grid-Profile Crossing Junction

28 U-shaped bar profile

30 clinch joint

32 Clinch junction area

34 Semi-tubular rivet

36 Semi-tubular-rivet joint area

38 solid punch rivet

40 Solid-punch-to-rivet joint area

42 Receiving groove for horizontal profile bars

43 Punch-out center setting means

44 Bearing area for horizontal profile bars

45 Bearing Rim

46 Vertical profile bar punch-out shoulder

47 Bearing rim

48 Bearing area for vertical profile bars

Claims (13)

Having a thin-walled inner container (12) made of a thermoplastic material for storage and transportation of liquid or free-flowing contents and having a support casing (12) tightly surrounding said inner container profile support casing 14 in which the inner container 12 is placed on the base pallet 16 and the base pallet 16 is provided with a lattice- And a casing (14) secured thereto, the pallet container (10)
Profile support casing 14 comprises intersecting vertical and horizontal profile bars 20,22 and wherein said vertical and horizontal profile bars 20,22 comprise any of the profile bars 20,22 Are connected at their crossing junction locations 24,26 by mechanical bonding without preliminary perforations,
The intersecting vertical and horizontal profile bars 20 and 22 are fixed to each other in a form-fitting manner at their intersections by a mechanical form fit, wherein the vertical profile bars 20 on the side oriented toward the horizontal profile bars 22 are fixed at their respective intersection points 18 in a rotationally secure manner by a mechanical locking Profiled support casing 14 and a second bearing region that is deformed for each of the vertical profile bars 20, Or the horizontal profile bars 22 on the side directed towards the vertical profile bars 20 are located in the region of the cross junction points 24, The profile bars 20 and 22 have a second bearing region that is deformed to relax joint connections underneath the profile bars 20 and 22 and further wherein the profile bars 20 and 22 are mechanically deformed without any preliminary perforation of the profile bars 20 and 22. [ (10) connected at the intersections (18) by splicing. The method according to claim 1,
The profile bars 22,20 of the lattice-profile supporting casing 14 are provided with their intersection points 18 due to the horizontal profile bars 22 held in the receiving grooves 42 of the vertical profile bars 20, Wherein said mechanical form fitting is provided on said pallet. 3. The method according to claim 1 or 2,
The profile bars 22 and 20 of the lattice-profile supporting casing 14 are provided with horizontal profile bars 22 disposed in punched-out centering means 43 of the vertical profile bars 20 22. A pallet container (10) in which the mechanical form fittings are provided at their intersections (18). 3. The method according to claim 1 or 2,
The upper horizontal profile bars 22 of the lattice-profile supporting casing 14 extend through the punch-out lower centering means 43 or shoulders 44 of the vertical profile bars 20 to the upper lattice- Is held in the vertical profile bars (20) at a first side (24). 3. The method according to claim 1 or 2,
The upper horizontal profile bars 22 of the grid-profile supporting casing 14 are connected to the vertical profile bars 22 at the upper grid-profile crossing junctions 24 through the shoulders 44 of the horizontal profile bars 22 20). ≪ / RTI > 3. The method according to claim 1 or 2,
The vertical profile bars 20 of the grid-profile supporting casing 14 are connected to the pallet container 10 held in the bearing rim 47 of the lower horizontal profile bar 22 at the lower lattice- . 3. The method according to claim 1 or 2,
The vertical profile bars 20 of the grid-profile supporting casing 14 are connected to a pallet 20 which is retained in the lower horizontal profile bars 22 at the lower grid-profile crossing junctions 26 via the punch- Container (10). 3. The method according to claim 1 or 2,
The profile bars 20,22 of the lattice-profile supporting casing 14 are constructed of different materials and / or have different cross sectional profiles such as a bar profile, a shaped profile or a hollow profile (10). 3. The method according to claim 1 or 2,
The vertical and / or horizontal profile bars (20, 22) of the grid-profile supporting casing (14) have a continuous profile. 3. The method according to claim 1 or 2,
The pallet container (10), wherein the grid-profile supporting casing (14) comprises separate side parts in a collapsible or foldable configuration. delete delete delete

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