WO1995018043A1

WO1995018043A1 - Rearrangement device for container with loose articles and/or products, and rearrangement method

Info

Publication number: WO1995018043A1
Application number: PCT/BE1994/000098
Authority: WO
Inventors: Walter Segers
Original assignee: Resilux NV
Current assignee: Resilux NV
Priority date: 1993-12-27
Filing date: 1994-12-27
Publication date: 1995-07-06
Anticipated expiration: 1996-06-27
Also published as: ATE156080T1; BE1007841A7; HK1014176A1; DK0733009T3; DE69404673D1; CA2179891C; US5894712A; EP0733009B1; CA2179891A1; GR3025208T3; ES2109805T3; EP0733009A1; DE69404673T2; AU1269195A

Abstract

Device for subjecting a container (1) containing products in bulk form to a movement, in which a set of movement means is provided for said movement, said movement means consisting of toss-up means which are formed by a set of bellows (11) which are controllable in a predetermined way, which is such that the container (1) for placing on a frame of the device with which the bellows (11, 12) interact is subjected to a toss-up movement in a particular sequence at various sides thereof, in order to rearrange the products in said container (1), and method therefor.

Description

Rearrarqw^gπfc device for container with loose articles a-nA/nr- products, -and rearrangement method

Background of the invention

This invention relates to a rearrangement device for a container containing loose articles and/or prod¬ ucts, in particular in bulk form, comprising a bearing framework in which a set of movement means is provided, for subjecting the container interacting with said bearing framework to a movement.

Prior art

In the case of known devices of this type means are provided for subjecting the container to a shaking movement, said means comprising reciprocating elements such as cylinders, in particular compressed air cylin- ders.

However, these elements have the disadvantage that they themselves are rigid and are thus a fixed height. During handling of the containers, namely loading onto and unloading from the rearrangement device, the container consequently has to be raised to a suitable height or lowered therefrom beforehand in each case. This requires equipment suitable for the purpose, such as a fork-lift truck.

Another disadvantage is that the cylinder elements are moved only in their lengthwise direction. The container can therefore only be shaken in this direction.

Yet another disadvantage is that such cylinders carry out a rather clumsy movement, in the case of which account must be taken of the inertia effect of the cylinder mass and also of the internal friction of the cylinders. .qnτmnaι-γ of the invention

The object of the invention is to eliminate the abovementioned disadvantages. To this end, in the case of the device according to the invention it is character- istic that the abovementioned movement means consist of toss-up means formed by bellows which are controllable in a predetermined way, which is such that the container to be placed on a frame of the device with which the bellows interact is subjected alternately at opposite sides thereof to a toss-up movement, for the rearrangement of the products in said container.

This considerably simplifies the design of the device, since the bellows need not be moved as a whole, but it is the bellows themselves which undergo a shape change under a suitable control, in particular an expan¬ sion followed by a contraction. Subsequent shape changes of predetermined bellows according to a controlled sequence cause the toss-up movement of the container. Moreover, this alternating expansion and contraction of the bellows does not occur only in one particular direc¬ tion, but in a direction which can vary slightly. This is due to the flexible structure of the bellows. An extreme¬ ly smooth operation of the device is obtained in this way. Due to this variation being possible in the direc- tion of the toss-up movement produced by the bellows, a better distribution of the bulk material placed in the container is obtained.

Another advantage of the bellows in this device is the extremely low height of the bellows in the con- tracted idle position. This makes it possible to dispense with expensive handling equipment such as fork-lift trucks for loading the containers onto and/or unloading them from the device.

Even manual handling of the containers relative to the device is a possibility in these circumstances.

Besides, from the point of view of safety, this makes it possible to work in less dangerous conditions. This actually means that the fork-lift truck csm be removed from the production process. There is also considerably less risk of damage to the device and/or container and/or bulk contents of the container.

A further important advantage is the extremely low inertia of the abovementioned bellows. This produces much greater acceleration in the bulk material placed in the container, and better filling of the so-called empty spaces in the bulk material is obtained.

Further features and characteristics of the invention are defined in the sub-claims.

Further advantages and details will emerge from the description below of an exemplary embodiment of a device according to the invention with reference to the appended drawings.

Brief description of the drawings

Figure 1 is a general perspective view of the device according to the invention in the idle position, with a container resting thereon.

Figure 2 is a partial view according to Figure 1, in which the device is in operation.

Figures 3 to 5 show diagrammatically the device according to/'the invention in various successive working stages.

Figures 6 and 7 are detail views of a variant of the device in the idle and in the working position respectively.

Figure 8 is a general view of a special applica¬ tion of the rearrangement device with a feed device for the container.

Description of the invention

Figure 1 shows a rearrangement device 90 accord¬ ing to the invention. It comprises a bearing framework 4, for supporting a container 1, in particular a packing box in which the articles contained are products in bulk form. When the bulk products are being packed they are usually emptied in bulk into the packing box, in the course of which the articles assume an arbitrary orienta¬ tion relative to each other. The result of this is that relatively large hollow spaces are formed between the articles, which means a loss of effective storage capacity in the packing box.

The bearing framework 4 is virtually parallel to the ground, and is set up a slight distance from the ground, in such a way that it is movable relative to a frame 41. The structure consisting of the frame 41 and the bearing framework 4 preferably has an open side 5, in such a way that a transportation unit 3, e.g. a pallet, intended for handling the container 1 can be pushed onto the bearing framework 4 and a stable support on three sides is achieved in this way. The bearing framework 4 is thus U-shaped, as can be seen from Figure 1.

The two opposite sides of the bearing framework 4 have at their two ends a toss-up means 11, which is preferably compressible. Two adjacent toss-up means lying at the same side of the bearing framework are supported by a longitudinal beam 22 in each case. The two longi¬ tudinal beams 22 are in turn supported by preferably compressible lifting means 12. For example, a toss-up means 11 is provided virtually at the level of each lifting means 12.

Said toss-up means 11; 12 are preferably formed by inflatable bellows, which to this end are each indi¬ vidually connected in a known manner to compressed air valves. The latter permit a regulation of the air supply to the bellows 11, 12 respectively. The toss-up means 11 are each connected to the bearing framework 4 by means of a profiled connecting piece 6, in such a way that they interact intimately. The abovementioned profiled connect¬ ing pieces 6 permit a transfer of the pressure variation, and thus of the volume variation, from the toss-up bellows 11, to the bearing framework 4. A volume vari¬ ation of the bellows can thus be converted into an up and down movement of the bearing framework 4. A suitable regulation of the air supply to the lifting bellows 12 can ensure a suitable upward movement of the bearing framework 4, and thus also of the container 1, by way of the longitudinal beams 22, which thus act as transfer elements. Imposing a particular pattern on the air supply, in the case of which the controllable parameters are, inter alia, duration and frequency, can thus ensure that a desired toss-up movement is imposed on the container 1. Bulk material placed in the container can consequently be rearranged in a suitable manner under the influence of gravity, in such a way that the lost space between the articles in bulk form is minimized. Said articles can be toys, ornamental articles, components and the like. According to a particularly advantageous application of the invention, the articles are PET preforms.

The profiled connecting pieces 6 are, e.g., a downward facing U-shape and are fixed at one longitudinal end to the bearing framework 4, with the result that a sturdy connection is ensured. The toss-up bellows 11 are preferably fitted virtually at the opposite free end of each connecting piece 6, in order to obtain a greater power transmission from bellows to bearing framework in this way, through the lever effect.

The rearrangement device is also provided with clamping means for clamping the container 4 during the toss-up movement. Said clamping means comprise a set of bars 7 which can be tightened against the container 4.. To this end, the bars 7, which are disposed virtually parallel to said longitudinal beam 22, are fitted in such a way that they can rotate in the direction of arrow G

(Fig. 4) relative to the frame 41 by means of a set of connecting arms 8. The.latter are provided at their free end with a folded part 35 which rests on the longitudinal beam, preferably by means of a damping strip 39. Both pairs of connecting arms 8 advantageously have an adjustable length, by means of which the bars can be adjusted to the correct height relative to the side walls of the container 4. This means that the device 90 can be used without any difficulty at all on containers of a wide height and/or width range. For this purpose, provision is made for, e.g., a further set of connecting arms 26, on which the abovementioned connecting arms 8 are slidable and can be clamped at the desired height by means of a pressure element 27. In this case it is each further connecting arm 26 which has a bent-over part 35 at its free end, as shown in Figs. 1 and 2.

According to a variant proposed in Figures 6 and

7, a feedback element 50 is advantageously provided between the projecting or bent-over part 35 of each arm and the longitudinal bearing beam. These feedback elements provide a feedback action from the longitudinal beam 22 to the corresponding arms 35 in the direction of arrow -G when the longitudinal beams 22 are sagging (-F) . This prevents the clamping means from becoming caught on the container 1 after the compressed air supply to the bellows 12 has been turned off.

The abovementioned feedback elements 50 are advantageously adjustable as a function of the type of container. The feedback elements in this case consist of, for example, a hook 51 which at one end is immovably connected to the longitudinal beam 22 and at the other end is provided with an adjustable screw 52 provided there and acting upon the end 35 of the arm, in the direction of arrow -F.

At both ends of each clamping bar 7 damping bushes 9 are provided, in order to ensure a supple clamping of the container and at the same time a virtual¬ ly negligible risk of damage thereto if the clamping bars 7 revolve against the container or during the toss-up movement thereof. In order to reduce the resistance between the rubbing surfaces of the container 1 and the damping bushes 9, the latter are fitted so that they are freely rotatable about each clamping bar 7. At the free end of each damping bush 9 a disc 10 which is virtually concentric therewith is also provided, the diameter of said disc being greater than that of the damping bush. The discs 10 make it possdLble to prevent a shift in the container parallel to the clamping bars 7, and thus ensure an efficient and reliable clamping.

As in the case of the connecting arms 8, the clamping bars 7 can also be such that they are adjustable in length through bars sliding into one another. Damping bush and disc can also be integral.

A control unit is preferably also provided, for determining and checking a set threshold value with regard to the container, for example scales 2, which will not be described in any further detail. The scope of this invention also covers a system comprising at least two devices 90 which are put into operation alternately. Continuous operation can thus be ensured, with a regular supply of rearranged containers. The system in this case can be executed in conjunction with a conveyor belt for the supply and discharge of the containers to and from the devices 90 respectively.

The device is also adjustable as regards the duration and frequency of the toss-up movement and as regards its pattern. Other parameters, such as weight of the container to be received, can also be made adjust¬ able.

The operation of the device 90 according to the invention is described below.

The .container 1 is first placed on the bearing framework 4 of the toss-up device 90 and weighed there by means of the weighing unit 2. All bellows 11, 12 are in the idle position shown in Figure 3 (idle position A of the device) .

The device is then switched on. In this way a toss-up movement is selected as a function of the load (weight of the container) , type of products or articles, and the like.

The container is also centred relative to the device, in order to achieve good functioning of the toss- up movement and of the clamping.

For this, centring elements 30 are advantageously provided, relative to which elements the container is easily positioned (Fig. 1) . Said centring elements 30 can be made adjustable, e.g. slidable, as a function of the - 8 - dimensions of the container 1 to be accommodated. Optimum functioning of the weighing unit 2 can be obtained in this way.

In a subsequent step the lifting bellows 12^' are inflated by appropriately acting upon the compressed air valves for supplying air thereto. The container 1 together with the bearing framework 4 on which it is resting is thus raised a certain distance relative to the scales 2 by means of the rising longitudinal beams 22. This produces an open space 32 between the latter and the bearing framework 4, and this space remains during all of the actual toss-up cycle. This gives the considerable advantage that the weighing unit 2 cannot be damaged by the toss-up movements of the device (waiting position B of the device, which constitutes the preparatory phase for the actual rearrangement step) . The rise of the longitudinal beams 22 causes the bent-over ends 35 of the arms also to be raised, and the arms are rotated in their entirety in the direction of arrow G. The clamping system, comprising clamping bars 7 and connecting arms 8 is rotated against the two trans¬ verse walls of the container. In the course of this, the length of the connecting arms 7 is adjusted until the side walls of the container are at a suitable height to ensure good stability thereof during the entire toss-up cycle. This is shown in Figure 4.

Provided that there is a suitable adjustment of the length of the clamping bars 7, the latter are pressed against the container 1 by way of the damping bushes 9, and the discs 10 are pressed virtually against the two longitudinal walls of the container. Said walls prevent the container from falling out at thai sides of the device.

The top set of toss-up bellows 11 is then turned on, in order to start up the actual toss-up cycle, a momentary position C of which is shown in Fig. 5.

As a result of the selection of a toss-up pat¬ tern, the toss-up bellows 11 are inflated in a particular sequence by supplying air through controlled opening of the corresponding compressed air valves. This means that, for example, two toss-up bellows 11 resting against each other are acted upon simultaneously in each case, while the two remaining bellows are in the idle position shown in Figure 5. Through imposing short, but relatively forceful impulse movements in this way on the container 1 in each case, the bulk contents thereof also undergo movements, in such a way that the spaces between the bulk articles or products are reduced to a minimum, with the minimum risk of damage to the articles or products, thanks to the smooth functioning of the - bellows. The uniformity of the advantageous rearrangement inside the container is greatly promoted by varying the pair of toss-up bellows 11, 11 or 11' , 11' used according to a chosen toss-up pattern. Said bellows can be either two adjacent toss-up bellows 11 at the same side of the bar, i.e. a transverse side of the device, or two adjacent toss-up bellows 11 at the same longitudinal side thereof (pair of bellows 11, 11'). An empty container can also be placed on the rearrangement device and weighed continuously there by means of the weighing unit 2 during the filling process. The feedback elements 50 described above ensure that the weighing can be carried out extremely reliably, and excellent measuring results are consequently obtained.

Figure 8 shows a special application of the rearrangement device, in which the latter is placed at the outlet 100 of a device 101 for manufacturing articles, in particular hollow articles, of the type described in Patent Application No. PCT/BΞ 94/00007, i.e. at the left end of the device shown there in Fig. 1. At that point hollow, elongated articles are being delivered and discharged into the container 1 in the direction of arrow H, under the influence of their own weight, while the container 1 together with the rearrangement device, is set up at the level of said outlet 100, for receiving the articles, in such a way that a filling process can commence.

As described above, the weighing unit 2 is set at a particular value. When the set value of the weighing unit 2 is reached in the filling process the toss-up cycle described above can - be turned on, and further filling can be stopped for the present. This can also be carried out at regular set intervals, in order to achieve homogeneous filling of the container 1. This promotes the optimum degree of filling. In order to permit continuous operation of the abovementioned production device 101, the above-described system, comprising several rearrangement devices 90, can advantageously be employed, for example, in a series arrangement, in which the further devices are set up downstream of the outlet 100.

In this way a further value is set for the weigh- ing unit corresponding to the first rearrangement device, said value being lower than the actual critical setting value defined earlier which was applied to the further rearrangement device set up downstream.

When the abovementioned lower setting value is reached, the partially filled container 1 is discharged and transferred to the further rearrangement device downstream. On the first rearrangement device the dis¬ charged container 1 is replaced by an empty container for filling, while the discharged container 1 is filled further until the set value of the rearrangement device downstream is reached. A very high degree of automation of the production process, including the packing phase, is thus obtained, with extremely high efficiency.

Claims

C L A M S

1. Device for subjecting a container (1) containing products in bulk form, comprising a bearing framework (4) for bearing the container (1) , in which a set of movement means is provided for said movement, characterized in that said movement means comprise a set of compressible toss-up means (11) , which are set up in such a way that they interact with said bearing framework (4) , and which are controllable in a predetermined way so that when the container (1) is placed on the bearing framework (4) the container (1) is subjected to a toss-up movement in a particular sequence at various sides thereof, in order to rearrange the products in said container (1) .

2. Device according to Claim 1, characterized in that a set of compressible lifting means (12) is provided for raising said bearing framework (4) .

3. Device according to Claims 1 or 2, characterized in that said set of toss-up means (11) and lifting means (12) respectively are formed by bellows (11; 12) .

4. Device according to one of Claims 1 to 3, charac¬ terized in that said bellows (11; 12) are controllable individually.

5. Device according to one of Claims 1 to 4, charac¬ terized in that the toss-up means (11) interact with said bearing framework (4) in each case by means of a profiled connecting piece (6) .

6. Device according to Claim 5, characterized in that said profiled connecting piece (6) is a downward facing U-shape, inside which each bellows (11) is dis- posed, virtually at one end of the connecting piece, while the other end thereof is immovably connected to the bearing framework (4) .

7. Device according to one of Claims 1 to 6, charac¬ terized in that clamping means are provided for clamping the container (1) during the toss-up movement.

8. Device according to Claim 7, characterized in that said clamping means comprise a set of bars (7) which can be tightened against the container (1) .

9. Device according to Claim 8, characterized in that the clamping bars (7) are fitted in such a way that they can rotate relative to-the frame (4) by means of a set of connecting arms (8), which are provided in such a way that they can rotate under the influence of the lifting movement of said lif ing means (12) , while a transfer element (22) is provided between the lifting means (12) and the free end (35) of the connecting arms.

10. Device according to Claim 9, characterized in that a feedback element (50) is provided in each case between each freely projecting part (35) of the connect¬ ing arms and said transfer element (22) .

11. Device according to the preceding claim, charac¬ terized in that each feedback element is adjustable.

12. Device according to one of Claims 9 to 11, characterized in that said connecting arms (8) are adjustable in height.

13. Device according to one of Claims 8 to 12, characterized in that virtually cylindrical damping bushes (9) are disposed over both ends of each clamping bar (7) .

14. Device according to Claim 13, characterized in that said damping bushes (9) are fitted so that they are freely rotatable about each clamping bar (7) .

15. Device according to one of Claims 11 to 14, characterized in that at the free end of each damping bush (9) provision is made for a virtually concentric disc (10) with a larger diameter than that of the damping bush.

16. Device according to one of Claims 11 to 15, characterized in that the damping bushes (9) and the discs (10) corresponding thereto are integral.

17. Device according to one of the preceding claims, characterized in that a control unit is provided for determining and checking a set threshold value with regard to the container.

18. Device according to Claim 17, characterized in that the control unit comprises scales (2) .

19. Device according to one of Claims 1 to 18, characterized in that it is adjustable in duration, frequency and/or weight of the container (1) to be received.

20. Device according to one of the preceding claims, characterized in that the bearing framework (4) is open

(5) at least at one transverse side.

21. System with at least two devices according to one of the preceding claims, in which the devices are alter¬ nately put into operation relative to each other.

22. Method for subjecting a container with bulk products to a movement by means of a device according to one of the preceding claims, characterized in that a container (1) is placed on the bearing framework (4) of the device, and in that the container (1) is subjected to a toss-up movement in a particular sequence at various sides thereof, in order to rearrange the products in said container (1) , while the set of bellows (11) is con¬ trolled in a predetermined way by means of compressed air.

23. Rearrangement device according to one of Claims 1 to 20, for use with a production device (101) for manufacturing hollow articles (102) , in which after the production process in (101) the manufactured articles are discharged to the outlet (100) of the production device (101) , where they (102) are delivered into the container (1) set up below the outlet (100), and the container (1) is placed on said rearrangement device (90) .

24. System according to Claim 21, for use with said production device (101) .