DE9000346U1 - Filling nozzle for filling machines for filling valve bags - Google Patents

Abstract

What is described is a filling nozzle for filling machines for filling valve bags, which has an outer tube (2), over which the valve bags to be filled can be slipped with their valve orifice, and an inner tube (1) arranged in the outer tube (2) and for guiding the filling material, as well as a device (6) for closing the inner tube. The device (6) is designed as a closing cap which is provided on the inner tube (1) at its filling-material outlet end and which dwells in its closed position as a result of the effect of gravity and can be pivoted into the open position by the stream of filling material. <IMAGE>

Description

Patent Attorneys ^

Dr. Hugo Wilcken ,·. ···; .··.

DlpWng. Thomas Wicker» : ·. .: ±

Sample track 1'2400 Lübeck 1 .:.*..* ..

Applicant: Greif-Werk Maschinenfabrik GmbH 2400 Lübeck
Krone forder Landstraße 177

Filling nozzle for filling machines for filling valve bags

The invention relates to a filling nozzle for filling machines for filling valve bags/with an outer tube, over which the valve bags to be filled can be attached with their valve opening, and an inner tube arranged in the outer tube for guiding the filling material as well as with a device for closing the inner tube.

When filling containers with a wide variety of filling materials, it is fundamentally important that the intended filling weight or filling volume is precisely achieved and maintained.

Such a filling support is known from DE-OS 38 09 593. It is used to fill valve bags with, in particular, powdery filling material and consists of an inner tube carrying the flow of filling material and an outer tube surrounding this to form an intermediate space, the intermediate space ; being able to be subjected to a vacuum which acts through openings in ! 20 the wall of the outer tube on the valve bag placed on it for filling and whose bag valve

to the filling nozzle. A suction channel connected to the inside of the valve bag is also provided to suck out the air displaced during filling. The outer and inner tubes each end at their front end in a closing cone, in the outer surfaces of which an outlet opening is arranged. The inner tube is designed to be rotatable about its axis, so that rotating it relative to the outer tube makes it possible to bring the outlet openings into congruence with one another or to move them relative to one another in order to close the filling nozzle.

This filling nozzle represents a complex construction and leaves much to be desired in that contamination of the bag valve, which would be equivalent to a leaky valve, cannot be safely avoided.

It is therefore the object of the invention to improve the known filling nozzle with regard to the deficiencies set out above.

Based on the type of filling nozzle mentioned at the beginning, this task is solved by providing the inner tube with a closure flap at its filling material outlet end, which remains in its closed position due to the effect of gravity and which can be pivoted into the open position by the flow of filling material.

The advantages that can be achieved in this way are in particular that the control of the proposed filling nozzle is automatic, i.e. without additional control means, and contamination of the bag valve is excluded. According to a preferred embodiment, the closure flap can be provided with an adjustable stop to limit the opening angle of the closure flap and in its open position can act as a guide surface for deflecting the

FUJ 1 material flow. This allows the direction (.l«s FUlL-(j u ts tr only S3) to be controlled, so that it can be ensured that the suction channel is kept free of material. In addition, the outlet cross-section of the filling nozzle can be influenced by setting the maximum opening angle of the closure flap, so that a compression effect can be achieved, which is particularly important for material containing air.

The design is explained in more detail below using an example shown in the drawing. It shows:

Figure 1 shows a longitudinal section through the filling nozzle according to the invention,
Figures 2

to 4 some variants of the closure flap,

shown in front view.

The filling nozzle according to the invention consists of an inner tube 1 which carries the filling material and is surrounded by an outer tube 2 onto which the valve bags to be filled can be attached with their bag valve. A gap is left between the inner tube 1 and the outer tube 2 so that an intermediate space 3 is formed which can be ring-shaped according to Figure 2 and crescent-shaped according to Figure 3. The outer tube 2 is slightly curved in the area of its free end and is provided with an outlet opening 4 which points diagonally downwards and is formed by a cross-section laid through the curve and diagonally to the axis of the filling nozzle.

The inner tube 1 ends in an opening 5 which is set back from the outlet opening 4 and is formed by an oblique cut through the inner tube 1 which is guided in such a way that the upper part of the opening 5 is set back from the lower part. The opening 5 is kept closed by a closure flap 6 which is arranged around a

The axis 7, which is arranged horizontally and transversely to the axis of the filling nozzle and is pivotally mounted in the upper part of the opening 5. The closure flap 6 is located with its
Dead weight on the front surface of the inner tube 1. The pivoting path of the closure flap 6 is limited by an adjustable stop 8, which rests against the inner wall of the outer tube 2 in the open position of the closure flap 6.

The intermediate space 3 is provided with a suction connection 4b ^and is closed at the front in its lower region 4a in order to prevent the filling material from entering the suction region. In the embodiment according to Figure 3, this closure is achieved by a non-coaxial arrangement of the inner tube 2. The offset of the longitudinal axes of the two tubes is provided in such a way that in the lower region of the filling nozzle the outer wall of the inner tube 1 comes to rest on the inner wall of the outer tube 2.

The design according to Figure 4 assumes a filling nozzle

a hollow profile 9, which has an approximately rectangular cross-section and is divided into two cavities 11 and 12 by a partition wall 10. While one cavity 11 is used to guide the flow of filling material, the other cavity serves to extract the liquid that is released from the valve bags when they are filled.

displaced air. The closure flap 7 is conveniently hinged here by means of a fork joint 13.

Due to the inclined position of the closure flap 6, a
the same gravity component holding it in the closed position

which can be overcome by the flow of filling material. By limiting the opening angle by means of the stop 8, the closure flap 6 can act as a baffle plate that deflects the flow of filling material downwards. The dead weight of the
In addition, the closure flap 6 causes a backflow in the flow of filling material, so that a desired pre-compression, particularly of filling material containing air, is achieved.

Claims (2)

Applicant: Greif-Werk Maschinenfabrik GmbH 2400 Lübeck Kronsforder Landstraße 177 Claims 1. Filling nozzle for filling machines for filling valve bags, with an outer tube over which the valve bags to be filled can be attached with their valve opening, and an inner tube arranged in the outer tube for guiding the filling material and with a device for closing the inner tube, characterized, that the inner tube (1) is provided with a closure flap (6) at its filling material outlet end, which remains in its closed position due to the effect of gravity and which can be pivoted into the open position by the filling material flow. 2. Filling nozzle according to claim 1, characterized in that the closure flap (6) is provided with an adjustable stop (8) to limit the opening angle of the closure flap (6).