EP0114157A2 - Device for the continuous and automatic opening and emptying of bags - Google Patents

Abstract

1. Device for continuously opening and emptying bags, comprising a housing (1), whether modular or not, and placed on a frame (2), a bag movement system, usually an endless conveyor belt (4), which can be fitted at the sides with a rim or lip to prevent spillage of the product, a bag cutting system consisting of one or more rotary cutting devices (7) capable of opening bags on three edges, in the front and laterally, and a system for the removal of empty bags characterized by the fact that the system for the removal of empty bags consists, on the one hand, of oscillating guiding elements (9) and, on the other hand of a set of rollers (10) preferably shaped like small wheels, said system comprising moreover a detection system causing, in an oscillation movement, upward displacement of the guiding elements (9).

Description

The present invention relates to a simple, reliable and universal device, that is to say that it can be used for any product as soon as the bags can be opened by a rotary cutting means. .

One of the aims of the invention is to ensure automatic and continuous operation by a device, machine of reduced size, preferably closed, while arriving at a higher rate while the work is less demanding. In fact, better and safer working conditions are obtained, which allows the device to treat harmful and dangerous products without entraining the usual residual dust.

The device can process all types of old and new bags made of paper, plastic, jute, etc ...; it can process bags filled with very diverse materials such as powdered products, grains, granules, fibers, compacted or not, etc. It is however, due to the high safety of the work it brings, intended more specifically to the treatment of harmful, smelly, toxic products, etc ... In addition, the device by its cutting system and wide opening of the bag, it will be perfectly emptied.

There are already bag opener devices comprising cutting facilities where the bags must be opened beforehand, generally right through along a horizontal or vertical line.

In certain types of known devices, the product must be separated from the fragments originating from the cutting of the bags by a sieving operation. This results in a significant dust problem and despite everything there are generally small fragments of the bag in the product.

In other types of known devices, provision is made for catching the bags by hooks or pegs of the pic type, but it is generally necessary, in order to grasp them, to pierce or hold them in more than one place and for example in two places or on both sides; this entails the use of multiple and mechanically complex means if one wishes to ensure correct operation under minimum safety conditions; This is particularly true if you want to prevent the bags from tearing too quickly or the bags from coming off.

The present invention overcomes these drawbacks by providing a device which is characterized in that it essentially consists of a modular box or not and placed on a chassis, a bag movement system, generally an endless conveyor belt, which can be equipped laterally with a rim or lip in order to avoid overflowing of the products, a bag cutting system comprising one or more rotary cutting means normally allowing the opening on the three sides of the bags, generally on the front and laterally . Preferably, the cutting means are mounted on pivoting arms or on an additional chassis and they are brought towards the center by springs or even air, oil pistons, etc. In addition, the device comprises a system of removal of empty bags, consisting on the one hand of oscillating guide elements and on the other hand of a set of cylinders preferably having the shape of small wheels. All systems operate electrically or pneumatically. The device is finally provided with a means of evacuating the product leaving the cut bags.

• à la figure 1, une vue transversale, côté latéral du caisson exclu, dans le sens de la longueur, dans une forme de réalisation d'un dispositif conforme à l'invention;
• à la figure 2, la même vue du même dispositif qu'à la figure 1 mais en coupe horizontale selon la ligne I/I de la figure 1, et donc côté supérieur du caisson exclu;
• à la figure 3, une vue transversale du même dispositif qu'à la figure 1, côté latéral du caisson exclu, mais en variante partielle de réalisation;
• à la figure 4, la même vue du même dispositif qu'à la figure 3, mais en coupe horizontale selon la ligne II/II de la figure 3, et donc côté supérieur du caisson exclu.

In order to better understand the invention, it is now described by way of example and without limitation in relation to a drawing which represents:

• in Figure 1, a transverse view, lateral side of the box excluded, lengthwise, in an embodiment of a device according to the invention;
• in Figure 2, the same view of the same device as in Figure 1 but in horizontal section along the line I / I of Figure 1, and therefore the upper side of the box excluded;
• in FIG. 3, a transverse view of the same device as in FIG. 1, lateral side of the box excluded, but in a partial variant of embodiment;
• in Figure 4, the same view of the same device as in Figure 3, but in horizontal section along the line II / II of Figure 3, and therefore the upper side of the box excluded.

In these various figures, there is shown by (1) a walled box (la, lb, lc, ld), mounted on a frame (2) itself placed on feet (3); by (4) an endless conveyor belt rotating on rollers (5): by (6), Figures 1 and 2, and (6 '), Figures 3 and 4, a cutting installation comprising rotary means (7) of cutting, either Figures 1 and 2, mounted on pivoting arms (8), or, Figures 3 and 4, arms with translatory movement (8 '), acting like each other under the action of springs or pistons air or oil (not shown); by (9) oscillating guide elements and by (10) wheel-shaped cylinders, these elements (9) and the set of cylinders (10) forming the system for removing empty bags. By (11) there is shown the empty bags evacuation zone; by (12) a funnel provided for the outlet of the products contained in the bags.

According to the embodiment shown in Figures 1 and 2, the evacuation zone (11) of the bags comprises an archimedean screw (13), while on the other hand, according to the embodiment of Figures 3 and 4, has provided a discharge funnel (14).

In FIG. 1, the rotary cutting means (7) execute an oscillating movement around two axes of rotation according to the arrows (15) and (16), whereas in FIGS. 3 and 4, they execute a rectilinear movement of va - back and forth according to arrows (17) and (18).

As it is desirable that one does not have to stop the conveyor belt and therefore that it works continuously, likewise, provision is made for a continuous rotation of the cylinders.

The device is also completed by an electrical or pneumatic drive system (not shown). It is also provided (not shown) that the device is equipped with an electrical cabinet which provides automaticity, security, as well as the necessary interlocks.

The device can also be supplemented with anti-dust equipment, a filter, etc. We can plan to install the device in a ventilated working cabin and / or a dusting cabin.

The product transporter can be completed by a crusher, a shredder, an archimedes screw; transport can be mechanical or pneumatic; Similarly, the transport of the cut bags can be completed with an archimedes screw, a press, a crusher, etc.

It is therefore possible, without departing from the invention, to complete and / or integrate the device.

We will now give below an example of operation of a device according to the invention. The filled and closed bags are brought to the conveyor belt (4) which drives them into the box (1), front side (ld). These bags can, in the case of the device according to the invention, be introduced almost directly one after the other. One can however envisage, in order to control the introduction well, a system with red and green light; in the case of automatic insertion, an electric lock can be provided.

The bags being introduced linearly and at a regular rate thanks to a fixed and wide entry airlock, are thus maintained until they are opened by the cutting system (7) including the rotary cutting means ( 7) are located, upstream, before the bags pass, in a directional alignment along the longitudinal axis of the device.

Under the action of an adjustable pressure before the device comes into action, the rotary cutting means (7) are continuously brought back to a central position.

The rotary cutting means (7) cut the bags (20), one of which is shown diagrammatically by (19) in the different figures 1 to 4, the bags moving in the direction of advance of the conveyor belt (5), according to the arrows (21).

By the provision provided for the rotary cutting means (7) upon introduction, each bag successively exerts pressure against the first cutting means, then the second.

After the bags have been cut, they are then brought continuously against the guide element system (9) which, at the time of the first impact, is at the bottom. The detection system (not shown) causes, in an oscillating movement, according to the arrow (22), the upward movement of the guide elements (9), so that the bags are stripped (bags cut and empty) is detached and separated from the product which it contained, and taken over the product by the cylinders (10) which entrain the bags under the bags towards the part (11), while the product which they contained falls into the funnel ( 12).

An automatic shutdown system (not shown) is provided for cases where the bags are not being fed satisfactorily or when the cutting is poorly executed; the immediate stop having the advantage of stopping the further introduction of the bags, which would risk in the otherwise, damaging the various elements of the device in the event of a malfunction.

Claims (10)

1. Device for continuously opening and emptying bags, characterized in that it essentially consists of a box (1) modulating or not and placed on a frame (2), a system for moving bags , generally an endless conveyor belt (4), which can be fitted laterally with a rim or lip in order to avoid overflowing of the products, a system (6, 6 ′) for cutting the bags comprising one or more rotary means (7 ) cutting normally allowing the opening on the three sides of the bags, generally on the front and laterally, preferably, these cutting means (7) are mounted on pivoting arms (8, 8 ') or on an additional chassis and they are brought back to the center by springs or even air, oil, ... pistons, in addition, it comprises a system for removing (9, 10) empty bags, consisting on the one hand of elements guide (9) oscillating and secondly by a set of cylinders (10) preferably having the shape of small s wheels. 2. Device according to claim 1, characterized in that the system (9, 10) for removing the empty bags brings them to a discharge zone (11) comprising an archimedean screw (13) or even a discharge funnel (14). 3. Device according to any one of claims 1 and 2, characterized in that the rotary cutting means (7) (8, 8 ') perform an oscillating movement (arrows 15, 16) or a straight back and forth movement - comes (arrows 17, 18). 4. Device according to any one of claims 1 to 3, characterized in that it comprises a detection system which causes in an oscillating movement (arrow 22) the upward movement of the guide elements (9). 5. Device according to any one of claims 1 to 4, characterized in that it includes an automatic stop system (not shown) for cases where the bags are not properly driven or when the cutting would be poorly executed, the immediate stop stopping the continuation of the introduction of bags. 6. Device according to any one of claims 1 to 5, characterized in that the conveyor belt (4) works continuously, and that it is the same for the rotation of the cylinders (10). 7. Device according to any one of claims 1 to 6, characterized in that it is supplemented by an electrical or pneumatic drive system and an electrical cabinet which ensures automaticity, security, as well as locks required. 8. Device according to any one of claims 1 to 7, characterized in that it is supplemented by anti-dust equipment, and / or a filter, etc., as well as possibly a ventilated work cabin and / or a dusting cabin. 9. Device according to any one of claims 1 to 8, characterized in that the product transporter is completed by a crusher and / or a shredder and / or an archimedes screw and that the transport is mechanical or pneumatic. 10. Device according to any one of claims 1 to 9, characterized in that the carrier of the cut bags is completed by an archimedean screw and / or a press, and / or a crusher.

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