DE3045497C2 - Horizontal filling tube on pneumatically conveying bagging machines for valve bags - Google Patents

Description

The invention relates to a horizontal filling pipe in the preamble of the main claim mentioned Art.

Such filling tubes are known. With them, the valve bag is held on the filling pipe by means of Clamping jaws or the like, which after completion of the filling process from the outside of the bag valve are released and thereby release the bag valve for removal from the filling tube. - Further horizontal filling pipes are known, in which with the help of a Luftableitur.g, which is usually in the lower area is arranged on the filling tube, air that has entered the sack during the filling process is sucked off or escapes. In the case of pneumatically conveying bagging machines, a not inconsiderable amount arrives Air from the filling tube directly into the discharge line or becomes one more with the air entering the discharge line or a lesser amount of air is carried away from the sack.

DE-GM 18 33 573 provides a device for venting valve bags when they are filled known by means of a filling tube which is oval in cross section, on which an equally oval cap is larger Cross-section is arranged in such a way that the gap between the cap rear side and the adjacent one Outside of the filling tube as a ventilation channel for discharging excess air from the valve bag can serve. - The cap attached to the top of the filling tube forms when filling the with his Valve on the cap resting valve bag a resonance chamber, whose vibrations affect the filling tube and the related parts are transferred.

Compared to the known filling devices, the object of the invention is not only the To create the possibility of making it easier to attach the bag valve despite the arrangement of an air discharge, the To seal the bag valve on all sides in such a way that only the air is sucked out of the bag during the suction process and not additional external air from the outside between the bag valve and the filling tube into the bag and to let as little air as possible from the filling tube get into the air outlet, as well as a Avoid entrainment of material from the sack into the air outlet. - It occurs at high and pulsating The conveying speeds of the filling material in the area of the bag suspension cause vibrations that affect the functioning the weighing device, but above all prevent the accurate weighing of the product. In particular, these disadvantageous vibrations of the weighing device should be completely or largely eliminated will. - The above requirements should be met with simple means.

To solve this problem, the invention provides the features of the characterizing part of the main claim before. - The features of the subclaims serve to further develop and improve the Features of the main claim.

Inflatable hoses on horizontal filling pipes are known so that for the use of an inflatable hose no element protection is claimed, the inflatable hose only in connection with the other features of the invention should enjoy protection.

The advantage of the filling pipe according to the invention is that the space can be removed with simple means between the expansion space and the pipe jacket is vibration-optimized and thereby the cross-section of the filling pipe is kept small, the supply line to the expansion space in the Space between the pipe jacket and the expansion space is integrated. Manufacturing results an advantage if the plastic or rubber jacket is surrounded by another thin outer tube and the space between the pipe jacket and this outer pipe with an elastically deformable Material is poured, foamed or injected. In the elastic mass the Air discharge and the inlet and outlet for the expansion space are embedded in such a way that all parts of the Pipe jacket are surrounded by the plastic or rubber jacket in a vibration-damping manner. The plastic mass, z. B. a polyurethane elastomer is not affected by the vibrations so that on longer Time the desired effect is maintained. - By using the two discs with or without The outer tube has the same advantage.

In the drawing, embodiments of the filling pipe according to the invention are shown, namely

shows

F i g. 1 the filling pipe in a first embodiment with its parts in vertical longitudinal section,

FIG. 2 shows a section along the line H-II in FIG. 1 and

F i g. 3 another embodiment of the air discharge in the plastic or rubber jacket.

In the example shown, the filling pipe according to the invention has the horizontally arranged, cylindrical Pipe jacket 1 through which the product in the direction of arrow 2 from a Füllgutzuführungsvon ichtung the End 3 of the filling tube and thus the bag attached to the filling tube with the aid of an air stream is fed. In the front section 4 of the filling pipe is on the upper cross-sectional area of the pipe jacket 1 a tube part 5 is placed, the two side edges 6, 7 of which are connected to the tube jacket 1, z. B. are welded. The pipe part 5 is in the embodiment according to FIG. 1 and 2 out of about one Tube half formed, the smaller axis of this tube half running in the vertical direction and the pipe part is elastically deformable in this direction. The Roh.teil 5 forms the front portion of a Air discharge, which opens into a tube 9 with a round cross section, extends from the tube jacket 1 in its rear section settles.

Eccentrically around the pipe jacket 1 is a preferably metallic outer pipe 10, the center point M of which deviates upwards from the longitudinal axis A of the pipe jacket 1 by the eccentricity e, and whose diameter is so larger than the outer diameter of the pipe jacket 1 that in the lower region of the filling pipe an intermediate space 11 is created between the pipe jacket 1 and the outer pipe 10, while the outer pipe 10 is wrapped around the pipe part 5 in the upper region of the filling pipe and an intermediate space 12 is created on both sides of this pipe part, which is larger than the intermediate space 11. - In the space between the pipe jacket 1 and the outer pipe 10 protrudes in the longitudinal direction and parallel to the jacket pipe 1, a line 13, which has a bend 14 at its front end, which opens into a bore 15 of the outer pipe 10 - By means of clamps 16, ί 17 od. the like, the two ends of a Blähschlauches 18 on the extending over the front region of the filling pipe outer tube 10 is held, so that between the inflating tube 18 and the tube 10 is a Blähraum is formed goes into the bore 15.

ι «The illustration in Fig.2 shows that with Inflation of the inflation hose 18, the bag valve opposite the filling pipe 1 is tightly closed on all sides but the valve can be pulled onto the filling tube easily and without damaging the valve

π can, since an outer surface of the inflatable tube with a circular cross-section is given. B. a polyurethane elastomer, ie the formation of a plastic jacket Z around the pipe jacket 1, the overall result is a device that remains largely vibration-free even at a high flow rate of the filling material in the pipe jacket 1 Sack during the filling process, air escaped from it in the direction of arrow P in FIG. 1 escape or sucked off, care being taken that air penetrates or escapes from the sack at another point or from

in the pipe part 5 between parts 1 and 10 is avoided.

The tube part 5 can also be replaced by an elastically deformable tube which is oval in cross section short axis in the vertical median plane of the

s ″> pipe jacket 1 and against which the outer pipe 10 rests from above (FIG. 3), the space between this and the jacket pipe 1 in turn being filled with a plastic jacket Z made of elastically deformable material.

1 sheet of drawings

Claims (6)

Patent claims: 1. Horizontal filling pipe on pneumatically conveying bagging machines for valve bags with a pipe jacket leading the filling material into the sack, an air discharge device eccentric for this purpose and with a holding means that holds the bag on the front pipe end during the filling process, characterized in that the pipe jacket (1 ) is also eccentrically enclosed by an elastically deformable plastic or rubber jacket (Z) with a round circumference, so that the air discharge (5) is arranged as a pipe or pipe section with a closed cross-section in the largest cross-sectional area of the jacket (Z) located above the pipe jacket this is surrounded by a closed outer tube (10) with an inflatable hose (18), the inlet and outlet line (13) of which is embedded in the plastic or rubber jacket 2. Horizontal filling tube according to claim 1, characterized in that the air discharge line (5) in the area of the outer pipe through a section of the pipe jacket (1) and a cross-sectional part of a Tube is formed, which is firmly connected to the pipe jacket 3. Horizontal filling pipe according to claim 1 and 2, characterized in that the air discharge line (5) in radial direction is elastically deformable jo 4. Horizontal filling tube according to claim 1, characterized in that the air discharge (5) in the area of the outer tube (10) is formed from an oval or the like in cross-section, the smaller of which Axis is located in a longitudinal center plane 5. Horizontal filling tube according to claim 2, characterized in that the air discharge line (5) consists of one Semicircular in cross-section or the like. Pipe section, whose shorter cross-sectional address is located in the vertical center plane of the pipe jacket (1) -to. 6. Horizontal filling pipe according to claim 1 and one or more of claims 2 to 5, characterized characterized in that the outer tube (10) and / or the tube jacket (1,21) are elastically deformable.