DD297123B5 - Method and device for the metered filling of flowable media in containers - Google Patents

Abstract

The invention relates to a process and device for the conveying-current controlled, viscosity-independent and metered filling of containers with pourable media. According to the invention, the time taken to fill the volume of a filler pipe is measured and compared with the volume of a container to be filled in a time-determined ratio. The invention concerns a device in the filler pipe (7) of which a filling medium is measured between sensors (5; 6; 16; 17) and taken into the volume of a container via a control device (8) in a time-quantity ratio.

Description

For this 3 pages drawings

The invention relates to a method for conveying flow-controlled, viscosity-independent and metered filling of flowable media in vessels ¹ and a device for carrying out the method.

It is known that in flow-controlled automatic filling machines, the flow is produced with low energy consumption and is reduced by avoiding cross-sectional constrictions in the line and conveyor system, the frictional resistance.

This is achieved in that in an automatically niveaugeregcltem product container, which is connected to a supply line for the product import, a centrifugal pump is arranged in the filling, at the pressure side, an ascending filling tube is connected. The filling tube has a shape that allows almost Nachtropffreies filling.

FR-PS 2 510 749 discloses a method by which the ejection of the liquid at a substantially constant speed is performed by a calibrated horizontal tube in which a measurement of the velocity between two different points is made. The different measuring points are arranged in the tube at the beginning of the ejection phase.

The effluent time has a certain time, which is determined by the removal of the amount of Flüssigkoitsmenge desired for the delivery.

In particular, the horizontal tube of the tube has a detector for determining the flow rate of the liquid Picking up on. From US-PS 4,460,026 is known to make liquid measurements with a Flüssigkeitsabfüllgerät that mohrero Reservoir elemento in certain positions. Dio Resorvoirolemente have a torso and a Halstoil, wherein

oin container outlet pipe is arranged.

The ancestor according to the US-PS has the Nachtoll on that hler dio dosing and measuring operations In a separate part

be made and a very hoho Meßungsaulgkoit is recorded.

Dor Disadvantage of this förderstromgestouerten filling machines consists in its time-dependent filling programs. The Zoitabhängigkoit of filling, d. H. Presetting the filling tent, leads to the viscosity already at low fluctuations Dosiei errors, which must either be corrected by a constant adjustment of the filling time odor by an additional

integrated scale, with the help of which the filled quantities for the following vessels can be corrected. After this

Interrupting the filling, after pauses in product and Gobindegrößewechsol begins again the costly adjustment of the Time program until the required quantities are set. The invention is based on the object of providing an ancestor and a device for the delivery-current-controlled,

To provide viscosity-independent and metered filling of flowable media in vessels, with which by means of continuous

Compensation of viscosity influences and a non-contact measurement of a Vorgleichsmengo a precisely dosiorte Filling of vessels is done. According to the invention, the object is achieved in that the base for filling the volume of the filling tube by a Uberlaufanordnurig one's level is always kept constant. It is a form of the invention that the time units are classified as clocks. Eino advantageous embodiment of the invention It is when the viscosity determination in a separate and parallel to the Filling tube arranged calibration tube is performed. The movements of the vessels are known to be from Position sensor and the measuring operations of the control signal detected in the control device, ordered and on the Output signal controlled output. The invention is further characterized in that oin filling pipe protrudes from a Pufforbehalter, in dom a Niveaiibehältor

is arranged, in which the filling tube connected to a pump, ends in a filling medium bath, wherein the level container has a common filling medium bath, which by a continuous overfilling of the leveling container with the

Filling medium is held in a continuous circuit and the upstanding end of the filling tube by a sensor

formed barrier, which is brought into connection via a control signal with a control device, which is provided via an output signal in front of a switching amplifier and pre-amplifying connected to the pump, wherein the

Control device with a position sensor via a control signal in an operative connection and the stohthe level in

the buffer tank is arranged, wherein the pump oine continuous circuit holding pressure-connected with the level tank and suction side is connected to the buffer tank.

In one embodiment of the invention, the circulation of the filling medium over the upper edge of the leveling container and the Pressure side of the pump provided. According to one embodiment of the invention, the control signal of the position sensor and the control signal of the light barrier

time-shifted successively reactively cooperatively connected to the control device.

Another form of exercise is that in the filling tube in a certain section two sensors arranged one above the other

are at the same time set by the section between the two sensors, a certain Füllvolumon.

According to a further embodiment of the invention, it is advantageous that arranged in the filling tube, a sensor and with the sensor on Outlet of the filling tube is brought into a Wirkverbindunq, wherein in an arrangement variant of the invention, the sensor in Füllruhr above the level dos medium may be arranged in the level tank. By dio solution according to the invention, it is advantageous that in a product container with a regulated product supply a Leveling container is arranged, which is filled by a arranged in the product container centrifugal pump. The level container, in

which dosing pump is arranged dabii is constantly over. Dio dosing pump is advantageous a centrifugal pump whose

Pressure side is connected to an ascending filling tube, which is designed so that the downwardly facing surfaces

shorter than the front edge of the filling tube, which always has upwardly facing surfaces. This will be trickling down

Filling residue always returned from the lower edge of the filling tube in the filling tube and a dripping largely

avoided.

Through the gloichmäßig Üb? '-'ifen the level container with the centrifugal pump disposed therein orst the Füllstart

advantageous constantly from the same level. If the filling tube volume is measured and used as a standard, it is only necessary to detect the filling start and the filling outlet exactly.

The time that elapses between a fill start and a fill exit is saved. This will detect which VoIi. .en

happens in a certain time the filling tube,

If, advantageously, previously entered into the controller, how often the Füllrohrvolumen in the vessel to be filled to

is empty, is only necessary to enter the appropriate multiplier before the actual dosing. Advantageously, the time that passes between the fill start and the fill outlet from the dom fill tube is accurately detected and multiplied by the previously entered target value.

Thus, the Förderorstromgesteuerte filling is independent of the preset time. If liquids of unequal viscosity are filled in practical operation, no adjustment is necessary. Changes

During the filling of products depending on the temperature of their viscosity, so these temperature changes have no

Influence more on the dosing accuracy. Thus, advantageously, the conveyor current controlled device is preset Times for dosing independently. If media of different and changing viscosity are filled, is no Adjust the filling time more necessary. Ausführungsbelsplel

The invention will be explained in more detail with reference to a Ausführungsbelspleles. In the accompanying drawing show

Fig. 1: the device in a schematic representation

2 shows the flowchart of the method steps

Fig. 3: the design and arrangement of the buffer tank

4 shows another embodiment of the arrangement for measuring the filling time of the filling tube.

The device has a buffer container 12 for receiving tixotoper media, in which a leveling container 11 is arranged. In the buffer tank 12, the leveling tank 11 upstream of a Üborlaufpumpe 4 is provided. The leveling container 11 also has a metering pump 3, to which a filling tube 7 is adapted. This filling tube 7 rises on the metering pump 3 and isl designed at the outlet so that the unton-facing surfaces of the spout are shorter than the front lower edge of the filling tube 7, which always has upwardly facing surfaces.

The spout 14 of the filling tube 7 is in operative connection with the light beam of a light transmitter 5, the beam of which is accepted by a light receiver 6, which is connected to a control device 8 and receives the control signals 13 of the light receiver 6. A Positionssondor 10 is arranged on a conveyor belt, not shown, and likewise brought into operative connection via a control signal 9 with the control device 8, wherein the control device 8 is connected to a switching amplifier 1 via an output signal 2. The switching amplifier 1 is sensitized by the control signal 2 and connected directly to the metering pump 3.

For functional operation, the formation of the outlet of the filling tube 7 is explained in Tüllenbereich. The Tüllo 14 of the filling tube 7 is designed according to the requirements of a non-dripping filling. Dio inclination of Tüllenbodens dom is vertical filling tube 7 accordingly steeply executed deviating little. In this case, the Tüllenboden protrudes and the other Tüllenbereich is designed to flee backward. Due to the steep, protruding from the spout area Tüllenboden 7 remaining filling medium does not run out of the Tüllo 14 out but in the filling tube 7 back. Furthermore, to the functional classification of the sensors 5; 6 are shown in the region of the nozzle 14. At the outlet end of the filling tube 7 is horizontal, e.g. a light barrier, consisting of sensor 5 and sensor 6, arranged. The beam path from sensor 5 to the sensor 6 extends before the filling and is executed in such a way that the sensor 6 is covered when the filling material emerges from the filling tube. By the darkening of the light receiver, the clock counter is started at the start of filling, stopped and the detected clocks in the St lorvomchtung abgespoichei t.

From the determined cycles for filling the filling tube 7, which corresponds to a precisely known volume Vf and the entered vessel volume V ₀ , the total filling time t "is determined in the control device.

It is determined in the control device 8, how often the counted clocks must be repeated to fill the filling tube to fill the entered vessel volume. For products where particular accuracy is required, the timekeeping Kc, ie the time elapsing until the effective speed of the metering pump 3, must be deducted from the counted clocks before they are processed in the control device 8. This time correction Kp is a constant quantity. For an exact compliance with the sensors G; 7 fixed time-quantity ratio, the arrangement of the buffer container 12 shown in Figure 3 is provided. By Zufuhrohr 15, the supply of Füllrnediums takes place in the buffer tank 12, which fills dieson up to an even closer to be displayed level. On the bottom of the buffer container 12, the leveling container 11 is attached and connected to this by a pipe, a pump 4 is provided, which promotes the medium in the leveling container 11. The leveling container 11 has a lower height than the buffer container 12 and is filled by the pump 4 so that the filling medium from the leveling container 11 constantly overflows. This is for the level in the container 11 located pump 3 constantly a same initial quantity of filling medium available and a uniform dosage possible.

After the switching pulse of the switching amplifier 1, the pump 3 conveys the filling medium upward through the filling tube to the nozzle 14. At the beginning of the process, the position sensor 10 outputs a control signal 9 to the control device 8. It is located in the region of a conveyor belt, not shown, with containers. A second, not shown control signal causes a stop of the conveyor belt. The control device 8 is a control command to the switching amplifier 1. By the switching amplifier 1, the metering pump 3 is controlled directly. The filling start "metering pump 3 on" is detected by simultaneous start of an integrated in the control device 8 counters.

If the filling jet emerges from the nozzle 14 of the filling tube 7, the light beam between the sensors 5; 6 interrupted. The counted clocks corresponding to a certain time are stored. From the time determined, a self-sufficient total time necessary for filling the container is determined in the control device 8. The total time for filling the vessel is according to the formula

I _n = ^ It, -K _F ) Vf

calculated. There are

Vq = vessel volume

Vf = filling tube volume

ti - filling time of the filling pipe

K _F = Correcting time.Time passes until the filling pump promotes medium

t _n = total filling time.

After the end of the total filling time t ", the control device 8 releases the control command 2. The switching amplifier 1 switches off the metering pump 3. The conveyor belt is started and a newly arriving vessel can be refilled. So that the volume of the filling tube 7 does not change, the leveling container 11 is arranged in the buffer container 12. The leveling tank 11 is constantly filled by the overflow pump 4 so that it does not overflow. The level in the buffer tank 12

dutch is a level control, not shown, which may be a float control in the simplest case, so dulled that the level in the buffer tank 12 is always lower than the level of NiveaubohSlters 11. Thus, it is ensured that at the start filling the metering pump 3 always from the gioichon Ausgongsnivoau , Another advantage of this arrangement is when filling tixotropic media is that the tixotropy is completely degraded by the constant filling of the leveling container 11 even in a non-continuous filling of vessels. Thus, it has for the first vessel to be filled to no different capacity, which can be caused by the fact that after the start of the hoho viscosity of the tixotropic medium must be abgobaut by the movement to a much lower amount of the viscosity. This also ensures that the correction actuator K _F {time, which passes after filling start of the filling pump up to the effective conveying speed) remains constant.

For each filling, the total filling time is newly determined in the control device B after the filling tube time ti has been stored. Thus, for filling larger or smaller vessels, only the input of the change of the vessel size in dio control device is required.

Changing viscosities, as they occur especially in media whose viscosity is highly temperature-dependent, have on the Dosiergonauigkölt koinen influence.

If the level in the leveling vessel 11 can not be kept constant, then the entire filling time for the filling pipe is not measured accurately.

In another embodiment according to Figure 4 are in a Füllrohrabschnitt at a predetermined distance from each other two sensors 1 ß; 17 arranged one above the other, which detect the passage of Füllgutfront in the filling tube between the two sensors, From dom distance of the sensors from each other and the cross-sectional area of the filling tube is determined in the control device 8, the filling flow and from the Fu.'zeit for the vessel to befüllendo accordingly the type of replenishment already indicated.

If another product is filled whose density is different from the previous medium, of course, the input of the density must be changed.

If products are filled by weight, it is necessary to enter the density of the medium to be filled before starting to fill.

In the control device 8 then the required volumes are calculated.

For media that are filled by volume in the vessels, only the vessel size is to enter, the sensors 5; 6 are arranged horizontally. This prevents that possibly from the filling tube drooping filling material for soiling of the sensors 5; 6 leads. The sensors 5; 6 has been expediently arranged so that the beam path between the light transmitter and the light receiver without recognizable distance from the spout end extends. After the start of the filling program, which is triggered by the presence of a container, media are filled, which have no tixotropic properties and not for settling or demixing noigon. Is dispensed with the NivoaukonstanthaUuno by constantly filling the leveling container 11, as shown in FIG. 4 in a Füllrohrabschnitt at a predetermined distance 18 from each other two sensors 16; 17 are arranged one above the other, the passage of the Füllgutfront in the filling tube 7 between the two sensors 5; 6 capture.

According to this embodiment is from the distance of the sensors 16; 17 from each other and the cross-sectional areas of the filling tube 7 in the control device 8 from the temporal succession of the signal of the sensors 16; 17 determines the volumetric flow and determines therefrom the filling time t "for the vessel to be filled in accordance with the embodiment already described.

In another embodiment, the control device 8 is not started until the pump is already delivering. Here, only one sensor 16 is arranged above the liquid level of the leveling container 11. Due to the incoming Füllgutfront the control device 8 is started by the sensor 16 and by interrupting the beam path between the sensors 5; 6 of the clock counter stopped and the detected clocks stored in the control device.

From the determined cycles for filling the filling tube section, which corresponds to a precisely determined volume and the entered vessel volume, the total filling time is determined in the control device.

In this embodiment, the total time for filling the vessel according to the formula

calculated.

In this embodiment, discontinuation of the correction time K _{f is} not required of the counted clocks, since the sensor 16 is already sensihiiisiert by the generated incoming flow.

In this embodiment, the sensor 16 triggers by the flow generated by the metering pump 3 and is connected to the sensors 5; 6 in an operative connection.

Claims (11)

1. A method for flow-controlled, viscosity-independent and metered filling flowable media in vessels, in which the time is measured to fill the volume of a filling tube and placed in staged comparison with the volume of a vessel to be filled in a time-proportionate relationship, the time to fill the Filling tube starting at the filling start in unit time, divided and terminated at the outlet of the medium from the filling tube, characterized in that the base for filling the volume of the filling tube is always kept constant by an overflow arrangement of a leveling container. 2. The method according to claim 1, characterized in that the time units are classified as clocks. 3. The method according to claim 1, characterized in that the determination of the viscosity is carried out separately outside the filling tube. 4. Device for the metered filling of flowable media in vessels, which is connected to a device for setting up and moving vessels and filling and dosing devices, characterized in that a filling tube (7) from a buffer container (12) projects, in which a level container (11) is arranged, from which the filling tube (7) connected to a pump (3), immersed immersed in a filling medium bath, wherein the leveling container (11) has a common filling medium, which by a uniform overfilling of the leveling container (11) with the Filling medium is held in a continuous circuit, wherein at the upstanding end of the filling tube (7) by a sensor (5; 6) formed barrier is provided, which is brought via a control signal (13) with a control device (8) in connection over an output signal (2) in front of a switching amplifier (1) is connected to the pump (3), wherein the control device (8) with a Positionssse nsor (10) via a control signal (9) in an operative connection. 5. Device according to claim 4, characterized in that the leveling container (11) is arranged in the buffer container (12) and the pump (4), holding a constantly moving circuit, the pressure side with the leveling container (11) and suction side on the buffer container (12 ) connected is. 6. Device according to claims 4 and 5, characterized in that the circulation of the filling medium via the upper edge of the leveling container (11) and the pressure side of the pump (4) is provided successively. 7. Device according to claim 4, characterized in that the control signal (9) of the position sensor (10) and the control signal (13) of the light barrier (5; 6), with a time delay successively reacting, are cooperatively connected to the control device (8). 8. Device according to claim 4, characterized in that in the filling tube (7) in a section (18) two sensors (16; 17) are arranged one above the other. 9. Device according to claim 8, characterized in that a filling volume is defined by the section (18) between two sensors (16; 10. Device according to claim 4, characterized in that arranged in the filling tube (7), a sensor (16) and with the sensor (5; 6) is in an operative connection. 11. Device according to claim 10, characterized in that the sensor (16) above the level of the medium in the leveling container (11) is arranged.