EP0900164B1 - Process and device for avoiding product dust or product gas emission when decanting with solid or liquid dosage systems - Google Patents

Description

The invention relates to a method and an apparatus for Avoidance of product dust or product gas leakage Filling with solid or liquid dosing systems.

Such methods and devices are described in DE-A-4 406 605; US-A-5 316 056 and FR-A-2 495 102 has become known.

Industrial powder and liquid substances must be dosed and in for transport and sale Containers are filled. So that you can dose and fill can be carried out as quickly and efficiently as possible, special solids or liquid dosing devices developed. Such metering devices usually include a product storage silo tapering from top to bottom, on its lower front is a vertical one Filler tube emerges. The passage through the filling pipe can can be opened and closed using a slide. That Filling tube goes up to the upper part of the container, which is a certain amount of the product to be filled. The For this purpose, the container is packed in one during dosing and filling appropriate location attached.

With powdered products, the problem arises that during dust is created during the dosing and filling process. This Dust gets into the ambient air or atmosphere if the container is removed from the dosing device. With liquid Products can do this during the dosing and filling process come to gas formation. The gas formation is at volatile Products particularly strong. These gases also get into the ambient air or into the atmosphere when the container from the Dosing device is removed. Such emissions are undesirable because they pollute the environment. If toxic products processed, it can even lead to direct impairment the health of, for example, those people come who operate the dosing device.

One was therefore looking for closed systems that cause lower emissions. Such closed systems are known to be achieved in that between the container and a tight connection is created to the filling pipe. In closed systems, facilities are necessary which evacuate or evacuate the air when filling a product is displaced from the container.

In known metering devices for filling e.g. sack-shaped The suction device consists, for example, of containers a funnel-shaped sack nozzle, the upper front side with a bowl-like cover is closed. The fill pipe penetrates the cover in the middle. An upper one Section of the fill tube protrudes from the top of the cover forth. A lower section protrudes into the sack nozzle. The sack nozzle and the cover are gas-tight with each other connected. A suction or aspiration tube opens into the cover. This aspiration tube is on its lower face connected gastight to the cover.

For attaching a bag-shaped container, for example an annular, inflatable inflation hose can be used, which is attached to the outside of the sack nozzle. In The outer diameter of the inflation hose is not inflated smaller than the inside diameter of the sack-shaped Container, so that the upper end portion of the container over the lower end section of the sack nozzle and over the inflation hose can be put up. If the inflation hose is put on Container is inflated, then its outer diameter increases and the wall of the inflation hose is pressed against the container wall. This fixes the container and at the same time one tight connection between the sack nozzle and the container is achieved.

When the slide is closed, the interior of the lower one Filler pipe section, the interior of the sack nozzle and the Cover and the interior of the bag-shaped container one contiguous, gas-tight space. If through the aspiration tube Air is sucked out of this room, then builds up in the Clear a vacuum. While filling a powder The resulting dust becomes a product of this vacuum but not suctioned off. Rather, it forms in the container above the already filled product and above a standing dust cloud or column of dust.

The present invention sets itself the task based on the prior art mentioned at the outset To create methods and an apparatus with which the leak of product dust or gas when filling powdery or liquid products with the help of solid or Liquid dosing systems can be reliably avoided. The object is achieved by a method and a device with the features of Claims 1 and 4 solved. Advantageous further training the invention are the subject of the dependent claims.

Fig. 1a

einen Längsschnitt durch den unteren Teil einer Dosiervorrichtung, welche mit der vorgeschlagenen Vorrichtung ausgerüstet ist;

Fig. 1b

einen Querschnitt A-A durch den unteren Teil einer Dosiervorrichtung gemäss Fig. 1a und

Fig. 2

eine Seitenansicht einer Dosiervorrichtung, welche mit der vorgeschlagenen Vorrichtung ausgerüstet ist.

The invention is explained below using an exemplary embodiment, inter alia, in the drawings. Show it:

Fig. 1a

a longitudinal section through the lower part of a metering device, which is equipped with the proposed device;

Fig. 1b

a cross-section AA through the lower part of a metering device according to Fig. 1a and

Fig. 2

a side view of a metering device, which is equipped with the proposed device.

The drawings show a device for avoiding Product dust or product gas leakage, which e.g. in a conventional metering device 1 for filling sack-like Container 5 is installed. The metering device 1 is with a Suction device of a known type equipped, which consists of a Sack socket 2 with inflation hose 6, a cover 3 and one Aspiration or suction tube 4 exists.

The embodiment of the proposed device has a first flushing pipe 7, which penetrates the cover 3 and along the filler tube 8 below the cover 3 extends to the lower end of the filling tube 8 (see FIG. 1a, 1b and 2). The lower end face of the flushing pipe 7 is with the lower end of the filler tube 8 flush. The piercing point the flushing pipe 7 in the cover 3 is gas-tight.

Furthermore, the proposed device has a second one Flushing pipe 15, which also outside the cover 3 runs parallel to the filling pipe 8 and the inflation hose 6 from penetrates downwards. The two breakthrough points on Inflatable hose 6 are gas-tight.

Below the inflation hose 6 is a flat, hollow deflection ring 13 arranged. The lower end of the second flush pipe 15 opens into this deflection ring 13. The deflection ring 13 has several Nozzles 14, which open laterally outwards. The nozzles 14 are regular along the circumference of the deflector ring 13 Intervals arranged. If gas is blown into the purge pipe 15 , this gas gets into the deflection ring 13 and flows out through the side nozzles 14.

A filling process proceeds as follows:
First, an empty container 5 is attached to the sack nozzle 2 with the aid of the inflation hose 6. The deflection ring 13 has the upper inner wall section of the container 5 from the inflation hose 6.

Then with the help of the aspiration or suction tube 4 in Space, which through the cover 3, the sack 2, the Inflatable hose 6, the container 5 and through the closed Slider 9 of the filling tube 8 is delimited, a negative pressure is generated. Then, by opening the slide 9 a certain amount of the product 10 falls into the container 5. The air displaced by the filled product 10 is aspirated through the aspiration or suction tube 4. about a standing cloud of dust remains in the filled product 10 11. During and after filling the container 5, gas, in particular Air blown into the second purge pipe 15. The gas emerges laterally through the nozzles 14 from the deflection ring 13 and thus prevents contamination of the inflation hose 6 by Product dust.

When the desired amount is reached, the first Flushing pipe 7 gas, especially air, in a defined manner and Blown vertically into the container 5. The gas stream 12 will through the surface of the filled product 10 upwards redirected. It flows due to the suction of the aspiration or. Suction pipe 4 through the space between the bag neck wall and the filling pipe wall upwards and tears the Dust particles with them. The gas infused with dust becomes finally sucked into the aspiration or suction tube 4. At the upper end of the aspiration or suction tube 4 the dust particles from a filter (not shown) Gas separated. The gas can then be returned to the purge pipe 7 become. A closed one can therefore be used for the purge gas Realize the cycle.

Claims (7)

1. Method for preventing the emission of product dust or product gas in conjunction with filling using solid or liquid metering systems, involving the following stages:

   a) Securing a drum (5) for filling a product by means of a metering arrangement (1);

   b) Creating a partial vacuum inside the drum (5) and neighbouring components by means of an extraction device (3, 4); and

   c) Filling the product into the drum (5);

   whereby,
   before releasing the drum (5) from the metering device (1), gas is blown into the drum (5) via a guide ring (13) with nozzles (14) arranged concentrically in relation to the metering arrangement and is then extracted together with the product dust (11) generated in conjunction with filling by means of the extraction arrangement (3, 4).
2. Method as claimed in Patent Claim 1, characterized in that the gas flow (12) is blown in essentially parallel with the axis of the drum.
3. Method in accordance with one or other of Patent Claims 1 and 2, characterized in that the gas, following extraction from the drum (5), is filtered from the product dust (11) and is returned to the closed cycle.
4. Arrangement for the implementation of the method in accordance with one or other of Patent Claims 1 to 3 with a metering arrangement (1) with a filling pipe (8) and an extraction device comprising a covering cap (3), an extraction pipe (4) for extracting the gas displaced from the drum (5) in conjunction with filling and an inflatable expanding hose (6) for sealing the drum (5) in conjunction with filling,
   characterized in that
   at least one flushing pipe (7, 15) is passed through the covering cap (3) of the extraction device and/or the expanding hose (6), in conjunction with which it extends as far as the lower end of the filling pipe (8) into a guide ring (13).
5. Arrangement in accordance with Patent Claim 4, characterized in that at least one flushing pipe (7, 15) runs along the filling pipe (8) and/or the expanding hose (6).
6. Arrangement in accordance with Patent Claims 4 or 5, characterized in that at least one flushing pipe (7, 15) discharges into nozzles (14) of the guide ring (13).
7. Arrangement in accordance with one or other of Patent Claims 4 to 6, characterized in that the passage of the flushing pipe (7, 15) through the cover cap (3) and/or the expanding hose (6) is executed in a gas-tight fashion.

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