DE202004014102U1 - pallet container - Google Patents

Abstract

pallet container (10) with a thin-walled rigid inner container (12) made of thermoplastic material for storage and transport of liquid or flowable fillings, with one the plastic container (12) as a support jacket tightly enclosing Lattice frame (14) and with a floor pallet (16) on which the plastic container (12) rests and with which the support jacket is firmly connected, with the lowest horizontally revolving, on the tubular pallet (18) resting on the base pallet (16) by means of a corresponding Fastening means is fastened to the floor pallet (16), thereby characterized in that the lowest tube rod (18) is provided with special "collar holes" (20) by which the fastening, preferably screwing, on the floor pallet (16) is realized.

Description

The The invention relates to a pallet container with a thin-walled rigid inner container Made of thermoplastic for storage and transportation of liquid or flowable fillings, with one the plastic container as a support jacket tightly enclosing Trellis frame and with a floor pallet on which the plastic container rests and with which the space frame is firmly connected.

PRIOR ART Such pallet containers with a lattice basket support jacket, in which the lattice tube frame consists of vertical and horizontal tube or wire rods welded to one another at the crossing points or essentially vertical tube rods, are generally known. B. the DE 30 39 635 C2 (S), EP 0 604 374 A1 (M) or EP 0 695 694 A2 (W). The lowest horizontally rotating tubular bar lying on the floor pallet is fastened to the floor pallet, which is preferably made of wood or plastic, by means of appropriate fastening means (nails, staples, screws, clamps or the like). This lowermost tubular rod usually has a round or rectangular cross section and can be drilled through at appropriate points and screwed directly onto the floor pallet.

If these holes in the lowest tube rod for screwing the mesh basket to the pallet by punching or drilling z. B. realized with a 9 mm punch or drill then this means perforation for a rectangular tube of 16 × 18 mm with a wall thickness of 1 mm a considerable material removal and reduction of the material cross section by about 28%. A round disc is used for punching punched out of the punching mandrel diameter and drilling chips fall accordingly the drill diameter. In addition, transverse grooves are inevitable when punching on the surface of the pipe, which is generated during subsequent loading (e.g. with internal pressure and drop tests) starting points for a crack through represent the remaining cross section and thus to premature failure of the pipe.

If this drilling or punching process before bending the tube rod (4 × 90 ° in the corner areas) carried out is leads the reduction in cross-section already mentioned above during the bending process disadvantageously to a strong ovalization of the hole and to a considerable reduction in wall thickness in the outer radius up to a crack initiation of the rectangular tube in the outer radius.

Conveniently, is therefore a perforation in the corner areas of the tubular bar only after Bending process made.

In order to the screw head after screwing not significantly over the Pipe cross-section survives, is it z. B. known, the pipe profile at the screw point to squeeze accordingly, whereby the pipe side walls fold inwards. Now at this point with an inner fold a hole in the usual Drilled or punched in this way, there is the disadvantage of this perforation all in the now even stronger Cross-section reduction, because it is now not only the top and Bottom of the tubular rod, but also parts of the inner fold by dancing. This results in an even greater reduction in cross-section of approximately 44%. This means a considerable weakening of the pipe in terms of on the internal pressure and drop resistance.

It The object of the present invention is to avoid such disadvantages and a secure attachment option of the mesh basket on the floor pallet and the drop resistance to improve the pallet container.

This The object is achieved by a "deep-drawn perforation" in the bottom horizontally rotating Tube rod with formation of so-called "collar holes" solved. The lowest tube rod is provided with special "collar holes" through which the attachment, preferably a screw connection, realized on the floor pallet is.

there are the collar holes through a two-step process with a first punching or Drilling process and a subsequent deep-drawing process in the lowest Pipe rod introduced. First a punch or hole with a significantly reduced diameter, preferably with a diameter of about 3 mm. Then will the perforation through a deep-drawing process until expanded to 9 mm, with the resulting funnel inside the tube pulled and the advantageous "collar hole" is formed. In others alternative embodiment of the invention, the "collar holes" with inner and if necessary also with an outer collar generated by the known flow drill method.

In the deep-drawing process for forming the "collar holes" with an advantageous hole geometry, the tube cross-section is reduced by only 10% due to the small initial perforation. The wall thickness is thinned towards the edge of the hole by deep drawing. Because of this, existing notches in the inwardly drawn hole edge are not critical for crack formation. This means that the strength of the tube is significantly improved due to the increased remaining cross-section and the significantly reduced sensitivity to cracks becomes.

by virtue of the collar pulled inwards is the outside contact surface of the Pipe for the screw head significantly enlarged what also leads to a gentler introduction of force.

At the Flow drill process is not at all Material of the tube wall removed, but only by partial heat from the central hole area through the collar formation in the Hole circumference area displaced.

In Embodiment of the invention provides that in each corner area (90 ° bending radius) of the lowest tube rod each introduced at least one collar hole is. With an additional Screwing the corner areas of the mesh basket onto the floor pallet in their four corner areas if possible far and deep in the respective wooden block of a wooden pallet or the material of a plastic pallet inside is another improvement the strength of the entire pallet container.

specially when screwing the mesh basket onto a wooden pallet it is desirable if the screws at an angle into the massive wooden blocks can be screwed in. This is according to the invention allows by obliquely punching the holes from the outside are inserted into the lower tube rod from top to bottom. This allows a screw (e.g. with a diameter of 8 mm) to pass through at an angle the collar holes be screwed in.

For the desired angled screw connection but also the lower perforation on the underside of the tubular rod somewhat stronger be widened. This allows you to achieve the desired inclination of the screws without significant weakening of the pipe cross section.

In further development of the invention provides that the introduction the collar holes in the lowest tube rod before bending the tube rod. In terms of production technology, it is considerably more advantageous to incorporate it the collar holes in a large number of straight, length-cut pipe rods as welded together high volume mesh baskets to handle on a drill.

Becomes normal perforation through normal drilling or punching before bending the tube rod (4 × 90 ° in the corner areas), so results inevitably while a considerable deformation or ovalization during the bending process of the hole area. The advantageous collar holes allow insertion before a subsequent one Bend. Since the hole geometry is circumferential through the double-sided or even quadruple collar is stabilized an ovalization during the bending process significantly reduced. With an additional eccentric Positioning the perforation can create a balance between the bend Outdoor tensile strength and internal compressive strength created during the bend to further reduce ovalization.

Around to completely eliminate the effect of hole ovalization during the bending process, is convenient provided that the holes punched into an elongated oval or egg-shaped shape before the bending process have, the longer diameter of the oval hole transverse to the longitudinal direction of the bar is arranged. The ovalization of the punched hole is included set so that after Bending process there is almost 100% circular perforation.

By the training according to the invention the mounting holes in the bottom tubular bar of the space frame there is a tendency that this holes with heavy loads to cracking and breaking the pipe rod to lead, significantly reduced and thus the drop resistance and overall the stability of the pallet container increased in a simple and inexpensive way.

The In the following, the invention is schematically illustrated in the drawings illustrated embodiments explained in more detail and described.

It demonstrate

1 a pallet container with the inventive fastening of the tubular frame on the floor pallet,

2 a cross-section through a rectangular tube with a conventional punched hole,

3 2 shows a cross section through a rectangular tube with a collar hole according to the invention,

4 to 9 further pipe cross sections

10 a corner area of a rectangular tube with a conventional punched hole and

11 a corner area of a rectangular tube with a collar hole,

In 1 is a pallet container 10 with a thin-walled rigid inner container 12 Made of thermoplastic material for the storage and transport of liquid or flowable filling goods, with a plastic container 12 as a support jacket tightly enclosing tubular frame 14 and with a floor pallet 16 on which the Plastic containers 12 rests and with which the space frame 14 is firmly connected. Here is the bottom horizontally rotating, on the floor pallet 16 overlying pipe rod 18 on the plastic floor pallet here 16 screwed tight. This lowest tube rod 18 has a rectangular or square cross-section and is drilled at a suitable point for direct screwing (without clips, possibly with a washer).

A conventional hole or punch hole 22 with a diameter D1 in the lowest tube rod 18 is in 2 clarified. In this case, the material of the tube wall in the borehole is drilled out or punched out and thus removed. A "collar hole" according to the invention 20 with the same diameter D1 is in 3 shown. To create this collar hole 20 is initially - as in 9 is shown - a small borehole 22 with a diameter D2, e.g. B. 3 mm, pre-drilled and then this small hole 22 from the outside in the deep-drawing process to a diameter D1, z. B. 9 mm, widened, each with the inwardly facing collar. The material (D1 - D2) is not removed here but only molded inwards and remains fully intact as a load-bearing cross-section.

In 4 is an off-center positioning of the collar hole 20 preferably shown for the curved corner areas of the lowest tube rod. In 5 . 6 and 7 are the schematic in the different collar holes 20 screws used accordingly 24 shown. You can see in 7 that only through a larger hole in the bottom of the tubular rod 18 an intentional inclination of the screw 24 can be achieved.

To explain the known flow drill method are in 8th the various process steps are illustrated. No material is removed from the tube wall, but partial heat exposure (local melting) uses a special flow drill bit to force the tube wall material out of the central hole area through the collar formation into the hole circumference area.

For a better understanding is in 10 sections of a 90 ° elbow of a tubular rod 18 from the corner area with a normal borehole made in the usual way before the pipe is bent 22 shown, which takes on the usual oval shape after the bending process, in particular the outside (in the pulling area) of the oval hole 22 is already provided with fine cracks. In contrast shows 11 a collar hole also made before the bending process 20 , which experiences no or almost no ovalization due to the special hole geometry and its circumferential rigidity and has a circular hole cross section after the bending process.

10

pallet container

12

Inner container HD-PE

14

Trellis-supporting shell

16

bottom pallet

18

unterster Cage

20

"Collar hole"

22

well

24

screw

26

Flow-drill-drill

Claims (9)

Pallet container ( 10 ) with a thin-walled rigid inner container ( 12 ) made of thermoplastic material for the storage and transport of liquid or flowable filling goods, with a plastic container ( 12 ) as a support jacket tightly enclosing space frame ( 14 ) and with a floor pallet ( 16 ) on which the plastic container ( 12 ) rests and with which the support jacket is firmly connected, the lowest horizontally circumferential, on the floor pallet ( 16 ) tubular pipe ( 18 ) using appropriate fasteners on the floor pallet ( 16 ) is fixed, characterized in that the lowermost pipe rod ( 18 ) with special "collar holes" ( 20 ) is provided, through which the fastening, preferably screwing, on the floor pallet ( 16 ) is realized. Pallet container according to claim 1, characterized in that the collar holes ( 20 ) through a two-stage work process with a first punching or drilling process and a subsequent deep-drawing process in the lowest tube rod ( 18 ) are introduced. Pallet container according to claim 1, characterized in that the collar holes ( 20 ) by a known flow drill process in the lowest tube rod ( 18 ) are introduced. Pallet container according to claim 1, 2 or 3, characterized in that in each corner area (90 ° bend) and in every straight length of the lowermost tubular bar ( 18 ) in the space frame ( 14 )) - according to the side walls of the floor pallet ( 16 ) - at least one collar hole ( 20 ) is introduced. Pallet container according to claim 1, 2, 3 or 4, characterized in that the collar holes ( 20 ), preferably in the corner areas (90 ° bends), diagonally from the top down to the inside in the lower tube rod ( 18 ) are introduced. Pallet container according to one of the preceding claims 1 to 5, characterized in that, for a desired inclined screw connection, the lower perforation on the underside of the tubular rod ( 18 ) is expanded a little more. Pallet container according to one of the preceding claims 1 to 6, characterized in that the introduction of the collar holes ( 20 ) in the lowest tube rod ( 18 ) before bending the pipe rod ( 18 ) in the circumferential shape of the space frame ( 14 ) has taken place. Pallet container according to one of the preceding claims 1 to 7, characterized in that the holes punched in an elongated oval or egg shape before the bending process have, the longer Diameter of the oval hole arranged transversely to the longitudinal direction of the rod in this way and set the ovalization of the punched hole in this way is that after the bending process has almost 100% circular perforation. Pallet container according to one of the preceding claims 1 to 8, characterized in that the collar holes ( 20 ) off-center in the lowest tube rod ( 18 ) are positioned.