DE102012003686A1 - Filling device for filling free-flowing substances or granules to manufacture molded plastic parts, has interstice arranged between outlet at distributer and intermediate chamber such that coherent suction stream is developed by openings - Google Patents

Abstract

The device has a trickling pipe (3) fed with a substance or granule from an intermediate chamber (2) i.e. preheating chamber. An interstice (4) is arranged between an outlet at a substance or granule distributer (1) and the intermediate chamber or between the intermediate chamber and the trickling pipe such that coherent suction stream is developed by filling- and trickling openings. The intermediate chamber is loaded by an exhaust pump (5). The filling- and trickling openings run opposite to a drop- or trickling direction of the substance or granule. An independent claim is also included for a method for operating a filling device for free-flowing substances or granules.

Description

The invention relates to a filling device for pourable substances or granules in Granulatverarbeitungs- or packaging machines, with at least one pulp or granule distributor, at least one subsequently fillable tundish and at least one of the tundish then with the materials or granules feedable trickling tube, and method for operating the same , according to the preamble of claims 1 and 9.

In production lines for plastic parts granulated resins are used as starting materials, which must be dosed and replenished several times in the manufacturing process, especially before pressing in a plastic press machine. When filling and transfer dusts are generated in the resins or granules used inevitably, because the solid particles of which they are made, are usually sharp-edged, and so inevitably burrs are rubbed during movement and transfer of the bulk material, as fine dusts in the bulk material are included.

In another automatic portioning these are repeatedly poured around before they finally land in the press tool for the production of plastic parts from said granules.

From the DE 10 2010 011 745 A1 already an advantageous method is known in which the transfer and the relative position of the filler neck and container is controlled so that the trickling opening is always surrounded by the granules, so as to reduce the resulting dust to a minimum. This refers essentially to the introduction of the granules into the mold.

Modern Granulatverarbeitungs- or packaging machines contain integrally placed in one unit dosing, in order to always bring precisely adjustable granules in Vorbehältnisse, and / or quantitatively adjustable granules to bring the final Ausrieselöffnungen, which then ultimately fill the molds.

During the transfer, the displaced air volume is driven through the bulk material and thus triggers the particulate matter present in the bulk material.

Dust is detrimental to both operators and moving parts of the granule processing or packaging machines.

There are also packaging devices provided with dust suction, as is known from the DE-OS 2 063 935 is known. Disadvantage here is that the dust extraction is made only in a larger volume range. So then large dust extraction with considerable power necessary to allow even a sufficient suction.

The invention is therefore based on the object, so far as to form a filling device and a method for operating the same according to the generic type that an almost complete dust extraction, but the acted upon by the dust extraction space is minimized, and the dust extraction is thus considerably effective ,

The stated object is achieved in a filling device of the generic type, according to the invention by the characterizing feature of claim 1.

Further advantageous embodiments are specified in the dependent claims 2 to 8.

With regard to a method for operating a filling the task is achieved according to the invention by the characterizing features of claim 9.

Further advantageous embodiments of the method are specified in the remaining dependent claims.

The core of the device according to the invention is that between the outlet on the substance / granule distributor and the intermediate vessel, or between the intermediate vessel and the outflow tube, there is arranged an otherwise closed or lockable space acted upon by a suction pump, such that a conclusive suction flow through the successively placed refilling space is arranged. and trickle orifices is formed, which runs opposite to the falling or trickle direction of the substance / granules.

Unlike in the prior art is not sucked a larger room with a suction cup, the suction is always incomplete. Instead, with the present invention, the suction directly along the trickle route, wherever where along the Rieselstrecke fine dust is formed, the fine dust also sucked directly. The physical effect is used, that whenever bulk material is filled into a container, the amount of air displaced thereby forcibly guided by the bulk material itself and thus discharges the particulate matter and suspend. With the invention, however, the suction is made so far at the top of the trickle route, that in opposite Direction to Rieselrichtung the suction air flow is passed.

The slight negative pressure at the top of the trickle causes a suction with nachgeführter air from below, so from the bottom Ausrieselöffnung the last lowermost Ausrieselrohres, which can be placed directly above the mold. Due to the suction flow, which is exposed to the outflow direction, the fine dust is sucked out immediately where it is produced along the entire filling and trickling section.

The bulk material thus falls downwards, namely by gravity, that is to say following the gravitational vector, while the suction flow runs countercurrently upwards or substantially upwards. It is important that the suction of the suction pump runs through all pours loaded pipes and intermediate containers contiguous, so that both in each Schüttstufe, as well as to the lowest final discharge opening of the Ausrieselrohres this suction acts. Thus, no more fine dust can escape at any point, and this with optimum, but small pumping power.

The suction power is dimensioned only for the fine dust extraction. With excessive suction would otherwise suck the granules, instead herausurseln it down.

In an advantageous embodiment, it is indicated that a downwardly tapering funnel is arranged at the bottom of the intermediate vessel. This forms the material transfer to the Ausrieselrohr below.

In a further advantageous embodiment, it is indicated that the Ausrieselrohr is adjustable in angle from the vertical deviating, wherein the filling device is adaptable to different tools of the pressing device.

Accordingly, it is further configured that at the entrance to the Ausrieselrohr another funnel is provided, and that the funnel of the tundish on the outlet side, the opening is provided with a spherical head surrounding this opening, which rests sealingly in the funnel of the Ausrieselrohres. By the ball head is achieved that even when tilt adjustment of the Ausrieselrohres a tight contact between the transition of the discharge funnel of the intermediate vessel and the Ausrieselrohr arises. Important is the at least halfway close conclusion at this point, in order to maintain the vacuum formed above by suction and thereby flowing upwards suction gas-tight to the lower Ausrieselöffnung the Ausrieselrohres.

In a further advantageous embodiment, it is stated that a parallel multiple arrangement of material / granule distributors, intermediate vessels and Ausrieselrohren is provided including funnel and ball heads. So it is possible that in a parallel multiple arrangement of Rieselstrecken only a common fine dust sucking gap must be provided.

Accordingly, it is advantageously designed that the parallel multiple arrangement has a common pumped space, which can be acted upon by a common suction pump.

For collecting the extracted particulate matter from the bulk material is provided that fluidly the suction of the space downstream of a Feststoffabtrenner is provided, which is placed on a T-tube connection, such that the fine dust if necessary trickles against the Absaugstromrichtung down, and an openable service door is removable.

So it is possible to recycle the granulate material.

An advantageous application is given by the fact that the filling device is integrated in a pressing device or an injection molding device. Thus, the entire pressing device is dust-free in itself, because the particulate matter development is essentially limited to the filling and Umfüllprozesse.

With regard to a method, the essence of the invention is based on the fact that between the outlet of the pulp / granule distributor and the intermediate vessel, a suction is made, so that a conclusive suction flow through the successively placed Umfüll- and trickle openings is created, which is opposite Filling direction of the substance / granules runs. Thus, the pressure gradient is such that upper the pressure is lowest, but at the bottom of the Ausrieselöffnung the Ausrieselrohres still sufficient for the extraction of fine dust vacuum is present.

In a further advantageous embodiment, it is therefore provided that the suction of the suction pump can be adjusted or regulated, such that depending on the filled material or granules, the pumping power of the suction pump is regulated. The necessary extraction capacity, at least if it is to be optimized in terms of energy to the minimum required level, can be set and the system can be operated energy-saving with regard to the suction power.

In the last related embodiment, it is therefore provided that via optical Sensor means in the vicinity of the lower material or granule outlet opening of the Ausrieselrohres this suction power is readjusted. With the help of optical sensors, for example in the form of a light path can be sensitively adjusted to local dust densities, and then the suction power can be adjusted.

An embodiment of the invention is illustrated in the drawing and described in more detail below.

It shows

1 : schematic arrangement of a parallel array of granules feeds.

2 : Detail of a single trickle route 1

1 shows a parallel multiple arrangement of bulk or trickle lines, ie a total of four bulk sections are shown here. Above, the supply of plastic granules via two material / granular distributor 1 , which are fed from a reservoir not shown here. From there, the bulk material in each case via pipes parallel four intermediate vessels 2 fed. This transition of filling tubes and Portionierbehältern is in the case with a suction pump 5 pumped completed gap 4 arranged, so that even the resulting fine dust is sucked out immediately. In the present case, the intermediate vessels 2 such containers, which operate as a preheating stage, in which the granules are preheated prior to further processing and processing.

The exiting or passing transition between tundish 2 and the gap 4 is sealed, so that the suction can only suck in air from below via the downhill sections. The bottom of the intermediate vessels can be closed in time for portioning, and / or for preheating.

From the intermediate vessel 2 then the granules fall over a first funnel 6 at the bottom of the respective intermediate vessel 2 then continue down. The said funnel 6 of the intermediate vessel 2 is with a ball head 8th provided with passage opening. This ball head 8th lies in another funnel, namely the funnel 7 at the entrance to the Ausrieselrohr 3 at.

The ball head 8th has the sense that the Ausrieselrohr 3 can be pivoted in the position to adapt this positionally to the position of the tool to be filled in a tool die. However, the transition should still be as close as possible by the pivoting, at least in such a way that the suction is not or only slightly disturbed. The aim is that according to the invention the top through the suction in the space 4 Achieved negative pressure is maintained as a suction to the outflow opening of the Ausrieselrohres. Thus, the Feinstaubabsaugung is not carried out large-volume and with great energy expenditure, as in the prior art, but with small and effective performance and only at the points where the cause of the fine dust.

The pump 5 is only for purposes of illustration in the drawing of 1 placed there. Advantageously, it should be at the upper open outlet of the T-pipe connection 10 be placed. At the bottom of the T-pipe connection 10 a reservoir is formed for the fine dust, which settles there with optimized pump power setting, and an openable service flap 11 temporarily or more or less regularly removed.

In addition, the occurrence of fine dust can also be monitored automatically. Thus, for example, an optosensory light path can be installed at the outlet of the Ausrieselrohr, which there automatically regulates the pumping power in case of leakage of fine dust.

2 shows this in detail for only one fall distance, ie for a Ausrieselrohr. Here, the falling direction of the granules is characterized by the downward arrow, which essentially falls from top to bottom. Contrary to this direction, the suction already described above runs quasi counter-current. Here it becomes clear why all pipe and filling transitions should close as closely as possible, namely that the suction flow reaches conclusively up to the top. It should thus be ensured that the suction of the intermediate space 4 essentially only air can move in through the drop route, and not unintentionally via other openings.

The entire filling device can advantageously be integrated in a granulate processing or packaging machine or a plastic press machine, in which the filled or fillable tools are arranged under the Ausrieselrohren. After filling, the pressing process then takes place automatically and the plastic parts are manufactured. Thereafter, the finished plastic parts are removed from the tools.

LIST OF REFERENCE NUMBERS

1

Substance / granulate distributor / dispenser

2

Intermediate vessel, preheating vessel

3

Ausrieselungsrohr

4

gap

5

suction Pump

6

Funnel at the bottom of the tundish

7

Funnel on the trickle pipe

8th

Ball head with through hole

9

fine dust collector

10

T-pipe connection

11

service flap

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102010011745 A1 [0004]
• DE 2063935 A [0008]

Claims (13)

Filling device for pourable substances or granules in granulate processing or packaging machines, with at least one mass or granule distributor, at least one subsequently fillable intermediate vessel and at least one from the tundish then with the substances or granules feedable trickle tube, characterized in that between the outlet of the substance / Granule distributor ( 1 ) and the intermediate vessel ( 2 ), or between intermediate vessel ( 2 ) and trickling tube ( 3 ) with a suction pump ( 5 ), otherwise closed or lockable gap ( 4 ) is arranged so that a conclusive suction flow through the successively placed Umfüll- and trickle is formed, which is opposite to the falling or trickle direction of the substance / granules. Filling device according to claim 1, characterized in that the intermediate vessel ( 2 ) is a Vorwärmgefäß for the granules, and about the Ausrieselöffnung press forming an automatic presses are filled. Filling device according to claim 1 or 2, characterized in that at the bottom of the tundish ( 2 ) a downwardly tapering funnel ( 6 ) is arranged. Filling device according to claim 3, characterized in that the trickling tube ( 3 ) is deviating in angle from the vertical. Filling device according to claim 4, characterized in that at the inlet to the trickling tube ( 3 ) another funnel ( 7 ) is provided that at the funnel ( 6 ) of the intermediate vessel ( 2 ) on the outlet side, the opening with a spherical head surrounding this opening ( 8th ), which sealingly in the funnel ( 7 ) of the trickling tube ( 3 ) is present. Filling device according to one of the preceding claims, characterized in that a parallel multiple arrangement of material / granule distributors ( 1 ), Intermediate vessels ( 2 ) and outflow tubes ( 3 ) with funnel ( 6 . 7 ) and ball heads ( 8th ) is provided. Filling device according to claim 6, characterized in that the parallel multiple arrangement a common pumped space ( 4 ), which with a common suction pump ( 5 ) can be acted upon. Filling device according to one of the preceding claims, characterized in that fluidically the suction opening of the intermediate space ( 4 ) downstream of a solids separator ( 9 ), which is connected to a T-pipe connection ( 10 ) is placed so that the fine dust trickles down if necessary against the Absaugstromrichtung down, and an openable service door ( 11 ) is removable. Filling device according to one of the preceding claims, characterized in that the filling device is integrated in a pressing device or an injection molding device. Method for operating a filling device for pourable substances or granules in Granulatverarbeitungs- or packaging machines, with at least one pulp or granule distributor, at least one subsequently fillable tundish and at least one of the tundish then loaded with the substances or granules Ausrieselungsrohr, characterized in that between Outlet at the pulp / granule distributor and the intermediate vessel, a suction is carried out, so that a conclusive suction flow through the successively placed Umfüll- and trickle is formed, which is opposite to the filling direction of the substance / granules. A method according to claim 10, characterized in that the suction of the suction pump can be adjusted or regulated, such that depending on the filled material or granules, the pumping capacity of the suction pump is regulated. A method according to claim 11, characterized in that via optical sensor means in the vicinity of the lower material or granule outlet opening of the Ausrieselrohres this suction power is readjusted. Use of a filling device according to one of claims 1 to 9, operated by a method according to one of claims 10 to 12, characterized in that the filling device is used in an automatic press for the production of plastic press parts and integrated there.

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