DE29608490U1 - Filling head for vertical dosing devices - Google Patents

Description

Filling head for vertical dosing

The present invention relates to a filling head for vertical dosing devices, in particular vertical screw dosing devices, for bulk material, as defined in the preamble of independent patent claim 1.

Vertical dosing systems for bulk materials are used to fill bulk materials into containers such as sacks, barrels or containers in a low-dust and measured manner. For example, vertical screw dosing systems are well known, in which the bulk material is introduced from above into a conical funnel using a downpipe, dosing chute or conveyor screw, in which the bulk material is kept in motion by a stirrer and scraped off the funnel wall. A screw arranged centrally in the funnel outlet and an adjoining bulk material pipe of a filling head takes over the bulk material and conveys it downwards in a controlled manner, whereby the bulk material flow can be controlled via the speed of the screw. A conical closure element is arranged vertically adjustable at the outlet of the bulk material pipe.

The filling head mentioned has the disadvantage that a continuous and precise control of the bulk material flow is not possible since the bulk material outlet opening is formed by the pipe cross-section of the bulk material pipe and is located in the direction of fall of the bulk material.

The present invention is therefore based on the object of creating a filling head of the type mentioned at the beginning, which enables a continuous and comparatively precise control

The filling head should also be as simple as possible in design and be usable for bulk materials with a wide range of flow properties - from shooting to slow-flowing, bridging.

This object is achieved by the filling head according to the invention, as defined in independent patent claim 1. Preferred embodiments emerge from the dependent patent claims.

The essence of the invention is that a filling head for vertical dosing devices, in particular vertical screw dosing devices, for bulk material, has a bulk material pipe for guiding the bulk material, the pipe cross-section of which is closed at the end on the bulk material discharge side. The bulk material pipe is provided with at least one bulk material outlet opening, which is located in the pipe wall. The bulk material outlet opening or openings can be closed by moving or rotating a closure member.

Thanks to the invention, it is now possible to regulate the bulk material flow continuously and precisely, since the bulk material outlet opening or openings are not located in the direction of fall of the bulk material.

In a preferred design variant, several bulk material outlet openings are distributed symmetrically around the circumference of the pipe at the end of the bulk material pipe on the bulk material discharge side. This means that no disruptive bulk material cone can form in a container to be filled during filling.

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In the following, the filling head according to the invention is described in more detail with reference to the attached drawings and using two exemplary embodiments. They show:

Fig. 1 - a partially sectioned front view

a vertical screw feeder for bulk material with a first embodiment of a filling head according to the invention;

Fig. 2 - a vertical section through a second embodiment of a filling head according to the invention with a closure member in the closure position;

Fig. 3 - a horizontal section through the bulk material pipe of the filling head according to the line I-I in Fig. 2;

Fig. 4 - a vertical section through the filling head of Fig. 2 with the closure member in an intermediate position and

Fig. 5 - a vertical section through the filling head of Fig. 2 with the closure member in the open position.

Figure 1

A vertical screw feeder comprises a conical hopper 81 into which bulk material can be introduced via a bulk material filling nozzle. The bulk material introduced into the hopper 81 is kept in motion by a stirring tool 83 driven by a motor 84 and is scraped off the hopper wall. The hopper outlet is equipped with a

Flange 810, to which a filling head according to the invention 1 with a bulk material pipe 2 provided with a flange 22 is attached. A screw 85 with a hollow screw pipe 850 arranged centrally in the funnel outlet and the adjoining bulk material pipe 2 takes over the bulk material and conveys it downwards in a controlled manner, whereby the bulk material flow can be controlled via the speed of the screw 85. The screw 85 is driven by the motor 84, like the stirring tool 83.

The dosing device described above is attached to a support arm 861 of a support device 86. By attaching the support arm 861 to a first column 862, which is arranged to be vertically displaceable in a second column 863, the height of the dosing device can be adjusted.

The pipe cross-section of the bulk material pipe 2 is closed at the bulk material discharge end by a closure plate 5, which is equipped with a screw tube bearing 51. The screw tube bearing 51 enables the screw tube 850 to rotate when the closure plate 5 is stationary.

In the pipe wall of the bulk material pipe 2 there are symmetrically arranged bulk material outlet openings 21 through which the bulk material 9 conveyed downwards by the screw 85 can exit the bulk material pipe 2. The bulk material outlet openings 21 can be closed with a sleeve-shaped closure element 3 arranged around the bulk material pipe 2 and displaceable in the longitudinal direction of the pipe. The closure

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The closure member 3 has a casing region 31 which is connected to a base 32 via webs not visible in Fig. 1. The closure member base 32 is attached to one end of a rod 41 which extends inside the screw tube 850 in the longitudinal direction of the tube. The other end of the rod 41 is fixed to a transmission arm 42 which is firmly connected to a piston 43 of an actuating unit 4, e.g. a pneumatic cylinder.

When the actuating unit 4 is operated, the rod 41 and thus the closure element 3 are moved vertically upwards or downwards. By moving the closure element 3 from the uppermost, open position downwards in the longitudinal direction of the pipe, the bulk material outlet openings 21 are completely or partially covered by the jacket area 31 of the closure element 3 as required. In this way, the bulk material flow can be continuously regulated and a container to be filled, e.g. a sack, barrel or container, can be filled with a high degree of accuracy.

In the embodiment shown, an outer pipe 6 surrounds the bulk material pipe 2 at the end on the bulk material discharge side. The outer pipe 6 is attached to a bracket 61 and is movable relative to the bulk material pipe 2. It serves as a connecting element to the container to be filled, which is usually on a scale.

On the outside of the bulk material pipe 2, there is also an annular hood 7 with a connecting piece 70 for an aspiration device. The annular hood 7 and the outer pipe 6 are connected with a flexible sleeve 62 and form

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This is a unit with which the air displaced during filling and the dust stirred up can be extracted.

The following definition applies to the entire further description. If reference numbers are included in a figure for the purpose of graphic clarity, but are not explained in the immediately associated description text, reference is made to their mention in previous figure descriptions.

Figures 2 to 5

In this embodiment, the bulk material pipe 2 has eight symmetrically arranged bulk material outlet openings 21, which are completely covered by the jacket area 31 of the closure element 3 in Fig. 2 and partially covered in Fig. 4. In Fig. 5, the closure element 3 is in the open position. The jacket area 31 of the closure element 3 is located above the bulk material outlet openings 21.

The webs that connect the jacket area 31 to the closure element base 32 are designated with the reference number 33. They are advantageously narrower than the wall parts 23 of the bulk material pipe 2 between the bulk material outlet openings 21 and are arranged in such a way that they do not come to lie in front of the bulk material outlet openings 21 in any closure element position.

In addition to the filling heads for vertical dosing systems described above, further design variations can be implemented. The following are also expressly mentioned here:

- Instead of the closure element 3, a sleeve-shaped closure element that can be rotated around the longitudinal direction of the pipe with openings distributed around the circumference can also be used. The closure element can be adjusted between an open position in which openings and a closed position in which wall parts of the closure element lie over the bulk material outlet openings 21 of the bulk material pipe 2. To rotate the closure element, a shaft actuated by the actuating unit 4 can be used instead of the rod 41.

- The closing device 3 can be actuated in any way. An actuating device could also be attached directly to the bulk material pipe 2.

- The bulk material pipe 2 can have a square cross-section instead of a round one. The bulk material outlet openings would then advantageously be arranged in the corner edges.

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Claims (10)

k sayings 1. Filling head for vertical dosing devices, in particular vertical screw dosing devices, for bulk material, with a bulk material pipe (2) for guiding the bulk material (9), which has at least one bulk material outlet opening (21), characterized in that the pipe cross-section is closed at the end of the bulk material pipe (2) on the bulk material discharge side and the bulk material outlet opening or openings (21) are located in the pipe wall and can be closed by moving or rotating a closure member (3). 2. Filling head according to claim 1, characterized in that several bulk material outlet openings (21) are distributed symmetrically over the circumference of the pipe at the bulk material discharge end of the bulk material pipe (2). 3. Filling head according to claim 1 or 2, characterized in that the closure member (3) is arranged in a sleeve-like manner around the bulk material pipe (2). 4. Filling head according to one of claims 1 to 3, characterized in that the closure member (3) is displaceable in the longitudinal direction of the pipe. 5. Filling head according to one of claims 1 to 4, characterized in that the closure of the bulk material outlet opening or openings (21) is continuously adjustable. ♦· 6. Filling head according to one of claims 1 to 5, characterized in that the closure member (3) is displaced or rotated by means of an actuating unit (4). 7. Filling head according to claim 6, characterized in that the actuating unit (4) is arranged offset from the bulk material pipe (2) and the closure member (3) and the connection between the closure member (3) and the actuating unit (4) is made directly or indirectly via a rod (41) or shaft arranged in the middle of the bulk material pipe (2) in the longitudinal direction of the pipe. 8. Filling head according to one of claims 1 to 7, characterized in that the bulk material pipe (2) is provided at the bulk material inlet end with a flange (22) for fastening the filling head (1) to a bulk material feed device. 9. Filling head according to one of claims 1 to 8, characterized in that an outer pipe (6) and/or a connecting piece (70) for an aspiration device is arranged on the bulk material discharge end of the bulk material pipe (2). 10. Vertical dosing device for bulk material, in particular a vertical screw dosing device, characterized in that it has a filling head (1) according to one of claims 1 to 9, which is removably attached to a bulk material feed device or forms a unit with it.