EP1502717A2 - Method for removing waste material from a blank made of mineral fibres - Google Patents

Abstract

The waste (6) is produce by e.g. punching out of mineral fiber felts (1), which are transported horizontally on a conveyor (3,4). A crossbar pref. located above the conveyor has compressed air nozzles (8) positioned along it dependent upon the positions of the waste. The nozzles generate an impulse jet at precisely the moment, in which the waste passes under the nozzle. The nozzle is connected to a compressed air tank and is computer-controlled dependent upon the position of the waste in direction of movement of the mineral fiber felt, and the traveling speed of the conveyor. Impulse width/period of the pressure jets is limited to max. 0,1s, pref. less than 0,05s.

Description

The invention relates to a method for removing the non-benefit from the benefit a mineral fiber product according to the preamble of claim 1.

In the production of mineral fiber products such as plates or in particular Felting exists for some use cases the need already in the course of the Production of mineral fiber product breakthroughs for later installation provided. This is especially the case when the mineral fiber product processed industrially, so in large quantities built into devices or to these is to be grown, and as a result of industrial processing, a packaging excretes in place. An example of this is about needled felt for lining the oven muffle of herds. The product already prefabricated breakthroughs are according to location, shape and size arranged so that in the installation case in the recesses the Dämmlage male components such as lines or the like without any a post-fabrication can be added to the insulation layer.

To produce such breakthroughs is first the material to be removed from the residual material, for example, by a cutting operation such as a punching operation separated. In a punching out of breakthroughs on a thin, solid Material such as a metal sheet satisfies the separation by the punching process as such, and the separated material usually falls readily by gravity out of the opening, so that this by the punching process is created directly. For mineral fiber products with a thickness of possibly several centimeters, however, the liability of the Waste material on the residual material due to the rough and large fiber surface so high that the actual removal of the waste material is a mechanical ejection process requires. After the separation process, the fiber product is thus provided with cuts, however, still contains the waste, which is technically called "non-use", while the remaining material ultimately to be used is called "benefit." becomes. In the context of the present invention, it is therefore about the one by a corresponding separation process already defined non - benefit from the benefits of Mineral fiber product to remove.

For this purpose, it has hitherto been necessary along the conveyor for the mineral fiber product to position workers in the conveying direction after the separation station, which the non-use by hand through the material of the benefit each one by one emit. This is extremely labor intensive and also makes a monotonous Work is the product to be provided with a variety of breakthroughs, so is either a corresponding number of additional workers along the to provide the conveyor organ formed line, or it must be the production speed be reduced by the promoter, which is economical is disadvantageous and can lead to production bottlenecks.

You might think of it in a disposal area for the benefits below the Mineral fiber product to arrange a vacuum chamber, which is the non-benefit the benefits. The acting on the respective non-benefit suction is however, proportional to the area of non-use. For disposal small area Non-benefits, which serve as the passage of a small diameter pipe, would be so high vacuum required that the fiber product would be damaged; moreover would be in terms of systemic leaks very high blower performance required. In any case, in the case of a large number of non-uses the effective negative pressure collapse when disposing of the first non-use, since False air would be sucked through the opening formed, so that a disposal the remaining non-use would no longer be guaranteed either way.

You might also think of it, instead of one below the product Vacuum chamber to use an over-product mounted overpressure chamber. Here, however, the conditions would be the opposite.

One could still think of the problem of collapse of the pressure difference to avoid when removing the first non-benefit, that instead of a static overpressure above the fiber product, a dynamic overpressure is used by an air flow. So you could get one across the entire width Provide the conveyor organ reaching slot nozzle, which a corresponding line of the continuous mineral fiber product subjected to high dynamic pressure, so as to bleed under this line passing non-benefit from the benefits. Also here, however, the problem remains that the non-beneficial Ejection force is proportional to the area. Especially small area non-use However, they require a particularly large ejection force, along the circumference of the Not useful acting high frictional forces at the benefit, too, without noticeable Deformation of non-use to overcome in the ejection process. The provision a dynamic overpressure for safe blowing even small area benefits would, apart from the high energy consumption, inevitably to such local pressure also lead to the benefit that damage to the fiber material would be inevitable.

The invention has for its object to provide a method for removing the To create non-benefit from the benefits of mineral fiber products, which Manual labor avoids, but a reliable removal of all non-use without risk of damage to the benefit and without excessive energy consumption guaranteed.

The solution of this object is achieved by the features of claim 1.

This results in a targeted air pressure surge for each non-utility to be removed, which blows the non-benefit out of the surrounding benefits, without the to apply or even impair or damage surrounding benefits. The targeted control of the desired impact point for the air pressure surge takes place in the surface of the mineral fiber product two-dimensional: the one dimension transverse to the conveying direction is by a mechanical pre-adjustment and fixing the Compressed air nozzle set at the point above the product, which is the Position of the targeted Nichtnutzens in the width direction of the product corresponds. The Control in the conveying direction is effected by a temporal control such that the Compressed air pulse is generated at the exact time at which the targeted Non-benefit passes under the compressed air nozzle. In the case of a small area, im essential symmetrical non-benefit of the impulse pulse is as accurate as possible in Center of non-use, to drive out the non-benefit, without causing tilting comes. In the case of larger and irregular shaped non-use is the optimal location of the pulse or pulses to be determined empirically. At a spectacle-shaped non-use, for example, would expediently a pulse impulse on directed the respective eyeglass eye.

Although a method has already been disclosed in JP 07-132496 A, in which a pulse burst of over the product in two directions movable Compressed air nozzles are used to prevent non-use after punching out to remove from the benefit; the machined material is designed like a leaf and e.g. a cardboard or corrugated board, so that it in a thin and solid shape is present. Therefore, there are problems with mineral fiber products regarding the adhesion of the waste material to the residual material due to the rough and large fiber surface does not open.

According to claim 2, the activation takes place with a compressed air storage tank connected compressed air nozzle with such a lead time, which the Delay of the pulse exit from the nozzle opening in relation to the pulse triggering equivalent. Such a compressed air storage tank upstream of the compressed air nozzle becomes used advantageously, since it provides a sufficient amount of air to a to achieve great momentum. The delay between pulse release and Pulse output can be calculated accurately, so that the pulse with large local Accuracy escapes to hit the non-use exactly at a desired location.

Since the mineral fiber product on the conveyor at a speed of For example, 0.3 m / s is conveyed, the nozzle opening covers a product length of 30 mm in one tenth of a second and 3 mm in one hundredth of a second. Around a pressure pulse in the middle of, for example, 6 mm in diameter Applying small area non-useful, so is an accuracy of the timing in the range of one thousandth of a second required. For this purpose, the timing of the Impulse bursts according to claim 3, preferably computer-controlled as a function of the Position of the non-use in the transport direction of the mineral fiber product and the Running speed of the conveyor. In this way, the lead time can be the control of the nozzle set as arbitrarily accurate such that the impulse pulse in time is strictly limited and at the exact desired time on the product surface incident.

Appropriately, according to claim 4, the temporal pulse width or pulse duration limited to at most 0.1 s, preferably to less than 0.05 s. For the Blowing process is used primarily the pulse peak, with a duration in the Range of one thousandth of a second occurs. A narrow limitation of the pulse duration too Both sides of the pulse tip allows for a concentration of the available standing impulse energy on the impulse peak and thus a high impulse force for exactly desired time.

Another problem associated with the production of such products for example, for the insulation of Herdmuffeln is that the fast-arriving Benefits are stacked and packaged following the removal of the non-use have to. Also this stacking in the sense of a pre-stacking for the subsequent Packaging of the stacks currently has to be done by hand. It is standing in the state Although technology is available for stapling machines for mineral fiber plates or felts, However, these are large, large-scale stationary facilities, the very large Require investment and limited quantities of a particular product can not be used economically.

In the processing of laminated felts or plates with particular Upper laminating film could be used for pre-stacking with a suction pad which acts on the laminating film with Saugkörpem and so the fiber product raising. However, this is not possible with unlaminated products.

In this respect, another sub-task of the invention is therein, even in the case of Production of unbacked mineral fiber products by handwork during pre-stacking To avoid products for packaging at the end of the line.

According to the invention for this purpose according to claim 5 on the top of the Mineral fiber product attached to a flow gripper, which has such a pressure difference Generates Δp between the underside of the mineral fiber product and its top, which, multiplied by the effective area of the mineral fiber product, the weight of the mineral fiber product.

In this way, therefore, an air flow through the mineral fiber product produced, wherein the pressure drop due to the flow resistance of the Mineral fiber product is used to provide an upward pressure force which is large enough to increase the weight of the mineral fiber product exceed, so this - without the use of any stationary suction - raised can be. In this way, plate to plate or felt can be felted pre-stack and avoid the manual work at this point.

To even the lowest surface resting on a conveyor belt of the conveyor organ To be able to record fiberboard or the like in this way, the Conveyor belt according to claim 6, for example through perforations permeable to air formed and / or the mineral fiber product relative to the surface of the conveyor belt stored elevated.

To generate a uniform air flow in the Flow gripper is in accordance with claim 7 whose lower surface, for example by uniformly distributed perforations designed permeable to air. This way will over the surface of the mineral fiber product across a substantially uniform Lifting force generated.

According to claim 8, the surface corresponds to the underside of the flow gripper preferably substantially the surface of the mineral fiber product. In this way becomes the entire area of the mineral fiber product for generating the lifting force used, so that the lifting of the mineral fiber product with minimal Δp done. can. Also here is the effect of possible breakthroughs left unused minimized in the sense of a generation of incorrect air, since the area fraction of Non-benefit compared to the benefit is usually very low. At one opposite the product surface smaller surface of the flow gripper could, however, a unfavorable large-scale non-use to considerable Fehlluftströmung and so that disturbance of pressure build-up lead.

Fig. 1

eine schaubildliche Darstellung eines Förderorgans mit einem darauf angeordneten Nadelfilz mit Nutzen und Nichtnutzen und mit schematischer Darstellung der erfindungsgemäßen Entfernung der Nichtnutzen,

Fig. 2

eine Draufsicht auf einen Verbund von zwölf Nadelfilzelementen mit Nichtnutzen und schematischer Veranschaulichung der Positionen der Druckluftdüsen gemäß einer beispielhaften praktischen Ausführungsform,

Fig. 3

eine perspektische Darstellung der Anordnung einer Druckluftdüse,

Fig. 4

eine vergrößerte schematische Schnittdarstellung durch ein Mineralfaserprodukt mit kleinflächigem Nichtnutzen, und

Fig. 5

eine schematische Darstellung eines Strömungsgreifers zur Stapelung von Filzprodukten.

Further details, features and advantages of the invention will become apparent from the following description of exemplary embodiments with reference to the drawing. It shows:

Fig. 1

a perspective view of a conveyor organ with a needle felt arranged thereon with benefits and non-benefits and with a schematic representation of the removal of non-use according to the invention,

Fig. 2

12 shows a plan view of a composite of twelve non-functional needled needle elements and a schematic illustration of the positions of the compressed-air nozzles according to an exemplary practical embodiment,

Fig. 3

a perspective view of the arrangement of a compressed air nozzle,

Fig. 4

an enlarged schematic sectional view of a mineral fiber product with small area non-use, and

Fig. 5

a schematic representation of a flow gripper for stacking felt products.

As can be seen from FIG. 1, there is a mineral fiber product designated overall by 1, in the example, a non-laminated needle felt on a conveyor member 2. The Conveyor 2 consists of a plurality of successively connected conveyor belts. 3 and 4. The mineral fiber product 1 consists of the so-called benefit 5 and a or multiple non-use 6, which leads to the formation of breakthroughs in a previous one Separation process have been separated from the benefit 5.

The non-benefits 6 are in the current practice of the benefit of the benefit 5 pushed out. With a relatively large non-utility 6, this is low Force required, since the non-use 6 at point load by a Finger bent and can be disposed of so deforming. In the case of small area Non-benefit 6, on the other hand, is more like the situation of a cork in the bottleneck: As can be seen in the enlarged view in Fig. 4, is a bending Deformation of the non-use 6 in such a case, virtually impossible. Of the Nichtnutzen 6 is located along the dividing line designated 7 on the benefits, the Both fiber surfaces have considerable frictional resistance. This frictional resistance must be overcome by pressure with the finger on the non-benefit 6 be so that it can be disposed of, as dash-dotted lines in Fig. 1 is illustrated. As can readily be seen, would be extremely high static Air pressure differences at the top and bottom of the fiber product 1 required by such a pressure difference a small area non-use 6 out of the benefit 5. Such high pressures would make the fiber material also harm the benefits.

Therefore, according to the present invention, a compressed air nozzle 8 is provided use, which in the example case above the mineral fiber product 1 with low Distance is arranged above the surface. The compressed air nozzle 8 is in the Senses operated intermittently, as at the exact time to which the non-benefit 6 conveyed in the mineral fiber product 1 under the compressed air nozzle 8 is generated, a strong compressed air pulse, which exclusively and substantially symmetrically impinges on the non-use 6 and this while running Conveyor 2 removed from the utility 5. The disposal site is chosen that below the fiber product 1 free space for a discharge of non-use 6 to Available.

In Fig. 2, a realistic work situation is shown in plan view. Twelve Needle felt elements as mineral fiber products 1 are not shown in detail Conveying member 2, wherein each three needle felting elements adjacent to their longitudinal sides are arranged side by side in the width direction of the conveying member 2. This composite of twelve needle felting elements is in a punch station in this arrangement been generated, that on the one hand, the dividing lines between the needle felting and on the other hand at the same time six non-use 6 per needle felting element to produce corresponding Breakthroughs have been produced in the needle felts. Like the dimension in the width direction and in the conveying direction shows, each non-use is 6 by two Dimensioning determined: by its position in the width direction (transverse to the conveying direction) as well as by its distance from the front edge of the composite.

Above the conveying member 2, two rows of 16 compressed air nozzles 8 are arranged. These are adjusted in the width direction and found that one of the Compressed air nozzles 8 is located exactly on the line lying in the conveying direction, which by one of the non-benefits 6 goes through. The non-benefits 6 thus all run exactly and in the example case, centrally below the nozzle opening of a compressed-air nozzle 8.

More difficult is the timing of the compressed air surge such that a Temporarily limited compressed air surge or compressed air pulse at the exact time is generated, at which the targeted non-use 6 under its assigned Compressed air nozzle 8 passes. This timing is conveniently computer controlled such that the instantaneous position of the respective fiber product 1 is detected is, in the example of Fig. 2 as the leading edge of the composite, and on the known running speed of the conveying member that time is calculated, which the targeted non-use 6 needed to the position of the associated compressed air nozzle 8 to reach.

Appropriately, this is arranged with a relatively close to the compressed air nozzle 8, not shown compressed air storage tank worked constantly on a desired positive pressure is maintained and to generate a blast of compressed air valve controlled for a short period of time to the compressed air hose of the compressed air nozzle. 8 is opened. The filling of the compressed air hose needs a certain amount Time span or requires the coming from the compressed air reservoir tank pressure front a certain time to pass through the compressed air hose and the body of the compressed air nozzle. 8 to run through and the nozzle orifice and nozzle opening and the surface of the To reach fiber product 1. Leading this time, the computer has that To open the output valve of the compressed air storage tank, taking into account this delay to a generation of the compressed air blast at exactly the right moment to arrive above the targeted non-use 6.

In this way, a high-energy compressed air pulse of low pulse duration and high impulse generated, which, if possible, centered on the Not benefit 6 of the form shown by way of example meets the non-use 6 without harmful Tilting out of the benefits 5 abruptly ejects.

In Fig. 3, an arrangement of such a compressed air nozzle 8 is schematically illustrated. The compressed air nozzle 8 has a lower nozzle opening 9 and a nozzle body 10, which is arranged for the most part in a nozzle holder 11. At the Top of the nozzle body 10 and the nozzle holder 11 is a compressed air connection 12th provided for the operation of a compressed air hose for connection to a Compressed air storage tank is connected.

The nozzle holder 11 engages around a traverse 13, of which in Fig. 3 only one short cut can be seen. The traverse 13 has a scale 14, which over a pointer 15 on the nozzle holder 11 an exact adjustment of the lateral position in Width direction of the conveying member allows such that the compressed air nozzle 8 with her Nozzle opening 9 shows exactly on a line which by a non-use. 6 passes through (see Fig. 2). To determine this position is a clamping screw 16th provided as is customary for such purposes.

With the described arrangement is the first time without manual work a safe Disposal of non-use 6 from the benefits 5 guaranteed. It represents the Removal of non - use 6 no limitation of production speed of Förderorganes 2, since the compressed air nozzles 8 in the frame in question here frame can work as fast as you like. On a single, essentially linear Position of the production line can thus at high speed all Not benefit 6 has been disposed of, for which so far at the same power a variety of Workers along the production line would have been required. This also contributes to shorten the production line.

Needless to say, manual labor is still required to obtain the mineral fiber products 1 am End of the conveyor 2 pre-stack and pack.

To avoid manual labor in the pre-stacking according to the invention in Fig. 5 schematically illustrated flow gripper 21 provided. This consists of a box-shaped body 22, a suction air connection 23 and a bottom or Lower surface 24, which is permeable to air, for example heavily perforated. The flow gripper 21 is movable in a manner not shown, but known per se stored that it is up and down and laterally movable to recorded fiber products 1 to be able to stack.

The conveyor belt 4 in the region of the flow gripper 21 is either likewise permeable to air, for example perforated, or with distance elevations provided, which the underside of the fiber product 1 at a distance from the surface of the conveyor belt 4 bring. In this way, the through the suction port 23 in the flow gripper 21 generated negative pressure by the conveyor belt 4 and the fiber product 1 and the lower surface 24 through an air flow generate, as in Fig. 5 by Arrows 25 is illustrated. In this case, both the conveyor belt 4 and the lower surface 24 formed in the sense of the lowest possible air resistance, so that the essential part of the pressure drop of the flow according to the arrows 25 through the increased flow resistance of the mineral fiber product 1 takes place. In this way results in the lower side of the mineral fiber product 1, an air pressure p1, the larger is as the air pressure p2 at the top of the mineral fiber product 1, after the Flow traverses the flow resistant mineral fiber product 1 Has. If A is the area of the lower surface or underside 24 of the flow gripper 21, then results in a force acting on the mineral fiber product 1 lifting force in the amount of A x Δp. If these are higher by setting a corresponding flow rate is held as the weight G of the mineral fiber product 1, the fiber product becomes 1 lifted and fixed to the lower surface 24 of the flow gripper 21. In this Position, the mineral fiber product 1 can be moved up and to the side, to make such a pile. In contrast to usual suction pads with static Vacuum on suction cups or the like can with such a flow gripper 21 also unkaschiertes fiber material can be raised and manipulated.

In mineral fiber product 1 breakthroughs from which previously the non-beneficial 6 have been removed, naturally lower the overall flow resistance of the Mineral fiber product 1 from. Should these breakthroughs be large, and should the Flow grippers 21 continue with a relatively small area A unfavorable in the range of attack such large-scale non-utility 6, so the generation of a sufficient lifting power difficult. Therefore, the area A of the lower surface 24 is preferred held in approximate conformity with the surface of the mineral fiber product 1. Seen on the total area of Mineralfaserrproduktes the area ratio of Not benefit 6 or the resulting breakthroughs relatively low, otherwise Too much material should be disposed of in the form of non-use 6 and therefore to a multi-part training of the mineral fiber product 1 avoided. In this Although frames do not accept the areas occupied by breakthroughs the generation of the lifting effect part, but the lifting effect in the range of Benefit 5, especially since the breakthroughs and the weight of the fiber product 1 accordingly Reduce.

In this way, the manual work is also in the end of the production line the pure packaging of pre-stacked mineral fiber products 1 limited and so the The automatic non-use disposal enabled high production speed also in this area by elimination of manual work allows.

Claims (8)

A method for removing the non-benefits (6) from the use (5) of a mineral fiber product (1), wherein the non-benefits (6) are defined by a separation process such as a punching operation and the pretreated mineral fiber product (1) lying on a conveyor (2) is transported, characterized in that at least one compressed air nozzle (8) is arranged on a preferably above the conveyor member (2) arranged crosspiece (13) whose position along the crossbar (13) measured transversely to the feed direction position of a targeted not allowed (6 ) is adjustable and fixable, and that a pulse impulse of the compressed air nozzle (8) is generated exactly when the targeted Nichtnutzen (6) passes under the compressed air nozzle (8). Method according to Claim 1, characterized in that the compressed-air nozzle (8) is connected to a compressed-air reservoir, and the activation of the compressed-air nozzle (8) takes place with such a delay time which corresponds to the calculated delay of the pulse exit from the nozzle opening (9) in relation to the pulse release on Compressed air reservoir corresponds. A method according to claim 2, characterized in that the timing of the pulse bursts computer-controlled in dependence on the position of the non-use (6) in the transport direction of the mineral fiber product (1) and the running speed of the conveying member (2). Method according to one of claims 1 to 3, characterized in that the temporal pulse width or pulse duration of the compressed-air blasts is limited to at most 0.1 s, preferably to less than 0.05 s. A method in particular according to one of claims 1 to 4, characterized in that in the conveying direction of the conveying member (2) behind the disposal of the non-use (6) a flow gripper (21) is arranged, which generates an air flow through the mineral fiber product (1), such in that the pressure drop (Δp) generated by the flow resistance of the mineral fiber product (1) multiplied by the area of action (A) exceeds the weight of the mineral fiber product (1). Method according to claim 5, characterized in that the conveying member (2) or a conveyor belt (4) present at the stacking station is permeable to air, for example by perforation, and / or the mineral fiber product is mounted elevated relative to the surface of the conveyor belt (4). A method according to claim 5 or 6, characterized in that the mineral fiber product (1) facing lower surface (24) of the flow conveyor (21) permeable to air, for example, perforated, is formed. Method according to one of claims 5 to 7, characterized in that the surface of the underside (24) of the flow gripper (21) at least approximately corresponds to the surface of the mineral fiber product (1) to be lifted.

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