Patent Application
20210371146
The present invention relates to a device and a method for producing a connection with no force shunt, in particular between a downpipe and a container of a metering scales.
In industrial systems it is frequently necessary to fill bulk materials, such as e.g. granulates or powders, but also fluids or gases via downpipes in metering scales or respectively containers of metering scales, in order to enable a metered passing on of the bulk materials. As, for reasons of space, the outlets of the downpipes are mostly situated in the region of the ceilings of the workspaces, it is often necessary to also arrange the metering scales close to the ceiling, i.e. at least at a height of approximately 2 metres or higher. For this, in particular fixed frames are used which hang under the ceiling, or the metering scales are moved e.g. by means of a stacker or of a swivel arm into their operating positions lying in the region of the outlets of the respective downpipe.
The connection between the outlet of a downpipe and the inlet of a metering scales or respectively of a container of the scales must often not be sealed enough in order to prevent an exiting of the bulk material, introduced through the downpipe, through the connection. This is the case in particular when, during the filling of the bulk material, dust can occur which would lead, on exiting, to a contamination of the system or to a health hazard. A sealed connection must also be present when fluids are filled or when gases can exit.
In addition to the requirement of a sufficient sealing against exiting substances, the connection between downpipe and metering scales must also be designed in such a way that through the connection no forces act on the metering scales which lead to a distortion of the gravimetric weight determination of the material which is filled in the scales. Therefore, force shunts or respectively force side effects of the connection are to be avoided.
This is usually achieved through the use of commercially available compensators or similar thin and flexible line components (e.g. of silicone), which are connected to the downpipe and to the metering scales. In order to achieve a force shunt-free connection between such connections however, a manual mounting (or respectively dismantling) of the compensators is necessary, which in addition demands experience on the part of the fitter.
The outlet of the downpipe and the metering scales are situated in their operating position often close to the ceiling of an industrial hall or respectively operating space. This is also due to the fact that the connection between downpipe and scales is to be as short as possible. The mounting/dismantling of the connection must therefore be carried out at a considerable height of at least 1.5 m to ca. 5 m or higher. In addition, owing to space requirements in the ceiling region of industrial systems mostly a plurality of further lines or systems are arranged, whereby the space available for mounting is further restricted. All this makes the secure mounting of connections between the downpipe and the metering scales difficult, whereby leaking connections occur or force shunts act on the metering scales, which can have a negative effect on the operation of the scales or respectively of the system as a whole.
In particular, in the case of an insufficient sealing, a dust pollution of the environment can occur, which can lead at least to a contamination or, in the case of substances which are hazardous to health, can even lead to a shutdown of the production. In addition, force shunts can influence the metering scales in such a way that the quality of products produced from the bulk material is negatively influenced.
It is the object of the present invention to indicate a device and a method for connecting an outlet opening of a downpipe with an upward-facing inlet opening of a container, in particular of a metering scales, by which a connection which is secure, sealed and free of force shunts is achieved between downpipe and container automatically, i.e. without the necessity of a manual mounting.
This problem is solved by the subject of the independent claims.
A connection device for connecting an outlet opening of a downpipe with an upward-facing inlet opening of a container can have a body with a continuous opening from an upper side to an underside of the body, wherein the body is designed in such a way that it is suitable to be connected by its upper side to the outlet opening of the downpipe via a flexible connection element, in particular via a compensator, in such a way that a connection is created between the outlet opening of the downpipe and the opening of the body. The connection device can comprise, furthermore, a coupling device which is attached to the underside of the body and which is suitable for creating a sealed connection between the opening of the body and the inlet opening of the container when the body rests on an upper side of the container.
In contrast to the prior art described above, therefore in the present invention the connection between downpipe and container, e.g. of a metering scales, is produced not only through a flexible connection element, such as for instance a compensator, but in addition a connection device is present. This connection device is used to produce the connection of the metering scales container to the connection element. For this, the connection device is securely connected with the downpipe via the connection element, e.g. a compensator. The connection device and connection element therefore constitute an extension of the downpipe.
The mounting of the connection element on the body of the connection device takes place here in a conventional, manual manner. However, the mounting is simplified in that the body of the connection device is smaller than the container which is to be connected. Thereby, in particular in the case of cramped space conditions in the ceiling region of industrial systems, the mounting of the connection element on the connection device is simplified compared to the mounting known from the prior art directly on the container. Hereby, the producing of a sealed connection between connection device and connection element is simplified.
After the connecting of connection device and connection element, the connection device is mounted in the region beneath the outlet opening of the downpipe, in which also the inlet opening of the container is situated, when the latter has taken up its operating position. The mounting can consist here e.g. simply in that the connection device hangs, held by the connection element, on the downpipe, as long as the container is not in its operating position. The mounting can, however also take place by different means, such as e.g. by cords connected to the ceiling and to the connection device, or a holding frame for the connection device. As explained further below, means can also be present for the vertical moving of the connection device, which hold the connection device in the air.
If the container is now moved into its operating position for the receiving of material, e.g. bulk material, fluids or else gases yielded from the downpipe, the connection device comes to lie on the upper side of the container in a particular region close to the ceiling. The connection device can be arranged here in such a way that on the moving of the container into its operating position, the opening of the body of the connection device comes to lie over the inlet opening of the container. Additionally or alternatively, it can also be necessary during the moving of the container to take care that an overlap of the openings occurs.
On resting of the connection device or respectively its body on the container, the coupling device is situated between the upper side of the container and the underside of the resting body. Through the resting of the body, i.e. the purely gravitative pressing of the body onto the container, it is guaranteed that no force shunts act from the body onto the container, which could negatively influence the measurement result of a metering scales using the container.
The sealed connection is achieved through an interaction of the coupling device with the upper side of the container. For example, the coupling device can have seals which are suitable to seal the transition from the inlet opening of the container to the opening of the body. For this, the force effect of the body onto the coupling device due to gravitation can already be sufficient. However, further means can also be present in order to draw the body and the upper side of the container to one another in such a way that a sealed connection occurs, e.g. through permanent—and/or electromagnets contained in the coupling device, and/or through pneumatic and/or mechanical devices. The pressing against one another of body and container upper side can be caused here solely by the resting of the body on the container. The coupling can, however, also take place only due to a user-controlled control signal.
The connection device therefore permits a permanent connection to be produced, for a particular downpipe, between the connection device and a connection element, such as for instance a compensator. Various containers can then be moved up to the connection device which is situated in the region beneath the downpipe. The connection of the container with the compensator then takes place in an automatic manner via the connection device, without a further manual mounting of the compensator onto the container being necessary Hereby, it becomes possible to connect various containers with a downpipe in a rapid, secure and uncomplicated manner, or respectively to connect a container with various downpipes equipped with the connection device. In addition, the mounting of the connection device on the compensator without the presence of the container permits an essentially better control of the tightness of the compensator connection. Lastly, through the possibility of mounting the connection device in a freely hanging manner, it is guaranteed that through the resting of the connection device on the container, no force shunts occur, whereby the connection device is advantageous in particular for the connecting of metering scales with downpipes.
The connection device can have, furthermore, a lowering device, which is suitable to mount the body with upward-facing upper side in a hanging manner, and to lower and raise the body in such a way that the lowering device, on resting of the body on the upper side of the container, exerts no forces onto the body. Thereby, flexibility is achieved in the arranging of the connection device and with respect to the operating position which is to be taken up by the container. The connection device can be lowered by the lowering device until it rests on the upper side of the container. In order to prevent force shunts, here in particular a parallel mounting of the underside of the body to the container surface is advantageous. In addition, the connection device can also be easily separated from the container again by raising, which accelerates the changing of containers and thereby the operating sequences.
The lowering device can have cable elements on which the body is fastened and the free lengths of which can be lengthened for the lowering of the body and shortened for the raising of the body. In this case, the body is therefore mounted on cables in a hanging manner. The cables or respectively ropes or cords can be drawn in here or respectively let out, in order to achieve a change in height of the body in a particularly simple manner. With the same length of the cable elements, in addition a stable mounting of the body occurs, which leads to a lowering of the body without force shunts.
The lowering device can have pneumatic cylinders, the cable elements can be fastened to pistons of the pneumatic cylinders, and the lengthening and shortening of the free lengths of the cable elements can be brought about by moving the pistons. In this case therefore, the position of the pistons in the cylinders determines the exact length of the cables between the suspension point situated in the vicinity of the ceiling and the connection to the body. This permits a particularly simple controlling of the cable lengths. The same effect can also be achieved by electric or hydraulically operated piston cylinders.
The coupling device can have a sealing element arranged on the underside of the body, which sealing element surrounds the opening of the body on the underside of the body, and the coupling device can have fixing elements which are suitable for producing the sealed connection between the opening of the body and the inlet opening of the container to press the body against the upper side of the container in such a way that the sealing element is pressed in between body and container. Thereby, in a particularly simple manner, the sealed connection between container surface and the body of the connection device can be achieved.
The connection device can have, furthermore, a control element, which is suitable to control the producing of the sealed connection between the opening of the body and the inlet opening of the container through the coupling device based on a user input. This permits a connection of connection device and container to be carried out selectively and in response to a user input. Likewise, via the control device, a separating of connection device and container can be carried out. Instead of a manual mounting of the container on the downpipe, therefore the connection of downpipe and container can be produced and/or released from any desired location by means of a control signal. In addition, the provision of such a control enables a fully automatic operation of the system.
The fixing elements here can be vacuum suction cups controllable by the control device, i.e. pneumatic fixing elements, which after receiving a corresponding signal generate a vacuum which presses body and container against one another, if applicable via the seal lying therebetween. In addition to controllable vacuum suction cups, controllable mechanical fixing elements are also conceivable, such as e.g. a remote-controlled engaging of retaining bolts into corresponding openings, mechanical arresting arrangements or electromagnetic fixing elements, such as for instance controllable electromagnets, which produce the same effect.
The body can be configured in a plate-shaped manner. The upper side of the body can have a projection for the arranging of the flexible connection element, which surrounds the opening. Through the plate-shaped configuration of the body, i.e. through a body extending substantially in two dimensions, a force shunt-free mounting of the connection device onto the container is facilitated. A projection for the arranging of the connection element facilitates its mounting and can thereby accelerate the operating sequence.
The opening of the body on the underside of the body can be smaller than the inlet opening of the container. Thereby, it becomes possible to allow the connection device to rest on the upper side of the container with a certain play. In particular, a problem-free filling of the bulk material which is yielded from the downpipe can also take place when the opening of the connection device does not come to lie centrally on the inlet opening of the container. Seals which are possibly present on the underside of the body should, however, be configured in such a way that in any case the inlet opening of the container is encompassed, i.e. the area which is included by such a seal is therefore greater than the area of the inlet opening.
A system for connecting an outlet opening of a downpipe to an upward-facing inlet opening of a container can have the downpipe, the container, the connection device described above and the flexible connection element. Such a system makes it possible to connect the downpipe and container with one another in a secure, rapid and automatic manner without the producing of force shunts acting on the container. Thereby, changeover times of containers can be shortened, which leads to an increase of production.
A method for connecting an outlet opening of a downpipe with an upward-facing inlet opening of a container by means of a connection device, as was described above, has: producing a connection between the outlet opening of the downpipe and the opening of the body by means of a flexible connection element, in particular by means of a compensator; applying the body onto an upper side of the container; and producing a sealed connection between the opening of the body and the inlet opening of the container by means of the coupling device. Thereby, the connection can be achieved in a rapid, secure and automatic manner, without force shunts acting on the container.
The invention is described below by way of example with the aid of the enclosed figures. The subject of the invention is, however, determined solely through the subject of the claims. There are shown:
In
The downpipe 200 corresponds to a line which is used in a conventional manner in industrial systems for the yielding of materials, such as bulk materials, e.g. granulates or powders, fluids or else gases. The materials are conveyed here principally by gravity out of the downpipe 200. In addition, means can also be present for the conveying of the materials. As shown in
Ultimately, the materials are to be filled into the container 300. A typical application is the pouring of materials via the downpipe 200 into the container 300 of a metering scales. The metering scales measures the weight of the material situated in the container 300 and can thereby meter the filling- and removing quantity of the material. In addition to the collecting containers of metering scales, the container 300 can, however, also be any other type of storage vessel into which materials are introduced via downpipes. Typically, the container 300 has an inlet opening 310, situated on its surface 302, through which materials can be poured into the container 300.
It is known from the prior art to produce a connection between downpipe 200 and container 300 not directly between outlet opening 210 of the downpipe and inlet opening 310 of the container 300, but rather to use a flexible connection element 400, which owing to its flexibility with existing connection can compensate an offset between downpipe 200 and container 300. For example, thin and flexible comparators can be used as connection element 400 (typically made from silicone), as are known from the prior art. However, it is also possible to use any other type of flexible and sealed line which can be mounted and dismantled between downpipe 200 and container 300 (or respectively connection device 100).
As described above, in this conventional type of connection, the problem exists that a mounting/dismantling of the connection element 400 on the inlet opening 310 of the container 300 is made difficult due to the limited space in the ceiling region and is thereby time-consuming and prone to error.
In particular in systems in which various containers 300 must be connected to a downpipe 200, or respectively a container 300 must be connected to various downpipes 200, several times a day, delays or errors such as leaking connections or—with the use of metering scales—force shunts, can occur through the usual manual connecting.
An example of such systems is the manufacture of plastic, in particular of coloured plastics. Here, a colour-generating material, mostly a powder with a tendency to dust formation, is delivered as an additive for the plastics via downpipes in metering scales. In the case of a colour change, typically the metering scales which are used must be separated from the downpipe and thoroughly cleaned, in order to prevent undesired colour mixtures. Subsequently, the metering scales must be connected with a downpipe delivering the next colour component.
Owing to the intensive dust formation during the filling into, and the passing on out of, the container, it must always be ensured that the connection from the downpipe to the scales is sufficiently sealed, as otherwise there is a risk of an intensive contamination of the system or a health hazard for the personnel. In addition, for the correct colour mixture the degree of accuracy of the metering scales must be sufficiently high, which entails the necessity that no force shunts must occur through the connection.
These problems are solved by the connection device 100, which is created between the connection element 400 and the inlet opening 310 of the container 300.
For this, the connection device 100 has a body 110 with a continuous opening 120 from an upper side 112 of the body 110 to an underside 114 of the body 110. The opening 120 serves in finished mounted state of the connection device 100 to direct the material exiting from the downpipe 200 into the container 300. The size of the opening 120 must therefore correspond to the type of yielded material (granulate, powder, dust, fluid, gas). In
The body 110 can be connected at its upper side 112 with the connection element 400, which in turn is connected with the outlet opening 210 of the downpipe. The connection must be such that materials which are conveyed through the connection element 400 on the upper side 112 of the body 110 can enter into the opening 110 and on its underside 114 can exit therefrom again. The connection can be configured detachably, e.g. through the use of fixing clamps or suchlike. However, this may also concern a permanent connection, e.g. by bonding or suchlike.
In the mounted state, the connection device 100 together with the connection element 400 therefore constitutes a lengthening of the downpipe 200 which serves, as it were, as connection piece for the container 300. The connection between downpipe 200 and container 300 is therefore brought about solely via a coupling of the connection device 100 to the container 300.
The connection device 100, after it has been connected to the downpipe 200 via the connection element 400, is mounted in a hanging manner, i.e. the body 110 of the connection device 100 is situated in the region of the outlet opening 210 of the downpipe 200 hanging in open air. This can be achieved e.g. in a simple manner in that the body 110 hangs over the connection element 400 on the downpipe 200. However, additional means (not illustrated in
In order to connect the container 300 with the downpipe 200, it is already known from the prior art to move the container 300 from below to the downpipe 200, as is illustrated schematically by the arrow in
Owing to the fact that the body 110 of the connection device 100 can be mounted beneath the outlet opening 210 of the downpipe 200, on raising of the container 300 the underside 114 of the body 110 comes in contact with the upper side 302 of the container 300. Through corresponding placing of the connection device 100 and/or corresponding controlling of the movement of the container 300, the opening 120 of the body 110 and the inlet opening 310 of the container 300 come to lie on one another here. As illustrated in
On the underside 114 of the body 110 a coupling device 130 is situated which, after the body 110 has come to lie on the upper side 302 of the container 300, produces a sealed connection between the opening 120 of the body 110 and the inlet opening 310. For example, through the use of magnets, mechanical arresting arrangements or pneumatic devices, the coupling device can press the upper side 302 of the container 300 against the underside 114 of the body 110 in such a way that a sufficient tightness occurs through the contact of the faces. If necessary, additional sealing means can also be mounted on the container 300 or on the body 110. The coupling can take place here without further intervention, e.g. with the use of permanent magnets. However, a controlling of the coupling via a control device can also be provided, e.g. with the use of electromagnets or switchable mechanical or pneumatic arresting arrangements. Then the sealing and thereby the production of a connection (and likewise the separation of the connection) take place based on a user input.
The connection device 100 therefore makes it possible to connect a container 300 with a downpipe 200 in a simple, secure and automatic manner, without it being necessary to carry out manual mounting steps in the ceiling region with each production of the connection.
Thereby, the change between downpipes or respectively containers is considerably simplified and accelerated, whereby the productivity can be increased.
A further advantage of the connection device 100 consists in that owing to the fact that the connection is produced in a state in which the connection device 100 rests freely, i.e. without force effects apart from gravity, on the container 300. Thereby, the risk of force shunts onto the container 300 is reduced, in particular when through the arrangement of the coupling device 130 a spatially uniform pressing-on of container 300 and body 110 is guaranteed, as for instance through a symmetrical distribution of the means necessary for this (magnets, suction cups, arresting arrangements and suchlike).
Thereby, the connection device 100 is particularly suitable for use in industrial systems in which bulk materials are to be introduced via downpipes in metering scales, as here an automatic connection method without force shunts is made possible.
The connection device 100 can have, in addition, a lowering device 140, which makes it possible to mount the connection device 100 not only in a hanging manner, but rather to also lower and raise it with respect to the downpipe 200 or respectively the ceiling. Through such a lowering device 140, it is therefore possible to lower the connection device 100 in a targeted manner onto a container 300 which is moved into the region of the downpipe, and to deposit it there without generating force shunts. The lowering device 140 can be suitable e.g. to lower the connection device 100 uniformly and parallel to the upper side 302 of the container 300, so that it comes to lie thereon with underside 114 parallel to the upper side 302 of the container 300. Likewise, the lowering device 140 serves to release the connection device 100 in a controlled manner from the container 300 and thereby to release the connection from the container 300 to the downpipe 200.
An example for a connection device 100 with a lowering device 140 is illustrated in
As illustrated in
Through the variation of the free length of the cable elements 142, the position of the body 110 can be changed in the vertical. This means that at least one of the ends of each cable element 142 can be moved in its vertical position, or respectively that the lengths of the cable elements 142 between a suspension point, such as e.g. an eye, a hook or a securing gripper, and the fastening on the body 110 can be varied, e.g. by drawing in the cable elements 142 on a winch or suchlike.
Through a symmetrical arrangement of the cable elements 142 and the plate-shaped configuration of the body 110, a uniform lowering of the body can be improved. The stability of the suspension can—if necessary—be improved through connecting yokes between the cable elements 142, as are shown by way of example in
The changing of the free length of the cable elements 142 can take place, as shown in
In this way, it is possible to place the connection device 100 in a simple manner controllably and uniformly onto a container 300 which is moved into the vicinity of the downpipe 200, without force shunts, in order to subsequently bring about the coupling between connection device 100 and container 300.
As explained above, the coupling device 130 can be embodied in various ways, in order to achieve an automatic and sealed connecting of body 110 and container 300. For example, the coupling device 130, as illustrated in
The sealing means 132, such as e.g. a conventional sealing ring or a soft metal, are arranged around the opening 120 on the underside 114 of the body 110 and surround the latter completely. Likewise, the circumference of the sealing means 132 must be large enough in order to also surround the inlet opening 310 of the container 300, which is usually larger than the opening 120 of the body 110.
With a sufficiently heavy body 110, the sealing means 132 can already be pressed in solely due to the weight of the body 110 in such a way between the underside 114 of the body 110 and the upper side 302 of the container 300 that a sealed connection is produced between the opening 120 of the body 110 and the inlet opening 310 of the container 300. In addition, such a purely gravitative pressing-on prevents force shunts, in particular in combination with the connection element 400.
Alternatively or additionally, in particular for a light body 110 e.g. of plastic, the fixing elements 134 shown in
In the example of
In addition to the coupling device 130, the body 110 can have on its upper side 112 means which facilitate a connection with the connection element 400. As illustrated in
The example illustrated in
A flow chart of a method able to be carried out with a connection device 100 as was described above is illustrated in
This takes place in such a way that a continuous connection is produced from the interior of the container 300 via the opening 120 of the body 110 and the connection element 400 to the downpipe 200. At 5120 then through the coupling device 140 a sealed connection is produced between the opening 120 of the body 110 and the inlet opening 310 of the container 300, i.e. the container 300 is connected to the downpipe 200 in a secure, rapid and automatic manner.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2018 115 468.2 | Jun 2018 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/065966 | 6/18/2019 | WO | 00 |
