DE102020002705A1 - Fiber stop - Google Patents

Abstract

In the case of weigh bale breakers, the interruption flap is replaced by a restraint system.

Description

Bale breakers with scales have been used to produce mixtures of different staple fibers since around 1950.

• 1) Die Öffnungswalze, die die Fasern in die Waagschale wirft, erzeugt einen Luftstrom, der wie ein zusätzliches Gewicht auf die Waagschale wirkt. Wird die Schließklappe geschlossen, erscheint das Füllgewicht geringer. Der beschriebene Einfluss ist aber nicht konstant und hängt auch von der Befüllung der Waagschale ab.
• 2) Durch das Schließen und Öffnen der Klappe entstehen zusätzliche Vibrationen, die das Messergebnis beeinflussen und/ oder eine längere Zeit notwendig machen, bis ein stabiles Messergebnis vorliegt. Hierdurch werden weniger Wägungen/ Wiegungen und somit eine Produktionseinschränkungen hervorgerufen.
• 3) Um die Klappe schnell bewegen zu können, wird sie in Leichtbauweise ausgeführt und unterliegt teurem Verschleiß.

In DE 100 43338 A1 such a bale breaker with scales is described. 1 Pos. 9 shows retaining flaps. During the filling process, the weighing container is first filled at a high speed. Shortly before the target weight is reached, the system automatically switches to slow filling. If a target weight is reached, the filling is interrupted and a flap device, usually consisting of one or two flaps, closes the space between the fiber opening and the weighing container. A similar system is already described in G 7241734.6, whereby the opening roller is used as a needle roller ( 6th ) and the restraint system is called slide (37). Electronic scales are often weighed again after they are closed to see how many fibers are actually in the weighing pan. Then the weighing pan opens and the weighed fibers are transported away. The usual closing flaps have 3 problems:

• 1) The opening roller, which throws the fibers into the weighing pan, creates a stream of air that acts like additional weight on the weighing pan. If the closing flap is closed, the filling weight appears to be lower. However, the influence described is not constant and also depends on the filling of the weighing pan.
• 2) Closing and opening the flap creates additional vibrations that influence the measurement result and / or require a longer period of time before a stable measurement result is available. This results in fewer weighings / weighings and thus production restrictions.
• 3) In order to be able to move the flap quickly, it is made of lightweight construction and is subject to expensive wear and tear.

These weighing systems are attached to both bale breakers and tower stores. Several scales often work together.

The object of the invention is to eliminate the above disadvantages and thus to increase productivity and operating time. The invention is described with reference to an exemplary drawing.

In a shaft 2 ) there are staple fibers 1 ). A feeding system 3 ), e.g. B. off 2 Rollers, the fibers are guided by an opening roller 4th ) to. The fibers are opened into flakes by the opening roller and roughly in the direction of the weighing pan 6th ) thrown. A restraint system interrupts the free flight of the flakes and prevents the air flow created by the opening roller from having a strong impact on the weighing pan. The restraint system consists, for. B. off 2 Rollers 5 ) that with a structure 9 ), e.g. B. flat strips are studded. However, a small conveyor belt or a cellular wheel can also be mounted between the opening roller and the weighing pan. The scale 6th ) acts on sensors S and has an opening mechanism 7th ), e.g. B. flaps to transfer the weighed content to a transport system 8th ), e.g., a conveyor belt.

This restraint system 5 ) and 9 ) is preferably equipped with a drive, the speed of which is variable over a wide range.

At the beginning of the filling process, the system runs at high speed so that the fibers are not held up. At the end of the filling process, the system runs more slowly, so that at the end even fibers can accumulate between the opening roller and the retention system and can be dosed more precisely.

Because the restraint system is placed close to the weighing pan, there are only a few fibers in free flight when the feed is stopped and only slightly increases the weight between the stop (target value) and the actual value before ejection.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10043338 A1 [0002]

Claims (7)

Weighing system for staple fibers which provides for intermittent filling of a weighing container with fibers opened by at least one opening roller and having a retention system for fibers between opening roller and weighing container, characterized in that the retention system has at least one driven roller. Weighing system for staple fibers after Claim 1 ) characterized in that the roller extends over the working width of the machine. Weighing system for staple fibers according to one of the Claims 1 ) and 2) characterized in that the speed of the roller is varied automatically. Weighing system for staple fibers according to one of the Claims 1 ) to 3) characterized in that the speed when filling the empty weighing container is faster than when the target value is reached. Weighing system for staple fibers according to one of the Claims 1 ) to 4) characterized in that the roller has elements on the surface that promote fiber transport, e.g. B. offset strips or rubber paddles. Weighing system for staple fibers according to one of the Claims 1 ) to 5) characterized in that at least 2 rollers work together. Weighing system for staple fibers according to one of the Claims 1 ) to 6) characterized in that the roller drives a conveyor belt.

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