EP2511228A1 - Dispositif d'extraction et commande de celui-ci - Google Patents

Dispositif d'extraction et commande de celui-ci Download PDF

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Publication number
EP2511228A1
EP2511228A1 EP12163607A EP12163607A EP2511228A1 EP 2511228 A1 EP2511228 A1 EP 2511228A1 EP 12163607 A EP12163607 A EP 12163607A EP 12163607 A EP12163607 A EP 12163607A EP 2511228 A1 EP2511228 A1 EP 2511228A1
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EP
European Patent Office
Prior art keywords
density
value
removal device
conveying speed
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12163607A
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German (de)
English (en)
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EP2511228B1 (fr
Inventor
Uwe Röger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
2 Komponenten Maschinenbau GmbH
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2 Komponenten Maschinenbau GmbH
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Publication of EP2511228A1 publication Critical patent/EP2511228A1/fr
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Publication of EP2511228B1 publication Critical patent/EP2511228B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/06—Details or accessories
    • B67D7/58—Arrangements of pumps
    • B67D7/62—Arrangements of pumps power operated
    • B67D7/64—Arrangements of pumps power operated of piston type
    • B67D7/645—Barrel pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material

Definitions

  • the invention relates to a removal device for removing fluid material from at least one material container according to the preamble of claim 1.
  • Appropriate removal devices are used to remove fluid material from a material container and supply it to a processing unit.
  • a processing unit for example, a unit may be provided, in which the conveyed material is poured into a mold.
  • processing machines such as an injection molding machine may also be provided.
  • such removal devices have a follower plate, which is associated with the material container and which rests on the material in the material container, and a feed pump for conveying the material from the material container.
  • displacement pumps are used together with a follower plate for conveying the material.
  • Piston pumps such as, for example, ladle pumps or other reciprocating pumps, diaphragm pumps, gear pumps or other suitable positive displacement pumps, are used as positive displacement pumps in conventional removal devices.
  • the term "stroke” is used to the effect that the lifting movement of a feed pump relates to the movement of the pump for conveying a volume unit defined according to the type of pump. This volume unit in which the delivery pump can convey or convey can be determined, for example, by the volume between two teeth or approximately by a specific volume in a piston.
  • the stroke frequency thus refers to the frequency in which the lifting movement takes place.
  • the material For example, be conveyed from the sampling device first to a mixing device in which the material is mixed with at least one other material before the material mixture is used for injection molding.
  • the material quantity of the conveyed material fed to the processing unit in a certain time interval is known as precisely as possible, in particular since this influences the quality of a product produced in the processing unit which consists of different materials a certain mixing ratio.
  • the conveying speed i. H. the amount of material that is supplied from the material container of the processing unit in a certain time interval, controlled by the stroke frequency of the feed pump.
  • the conveying speed can be adjusted, for example, via the stroke frequency of the feed pump.
  • different materials each have a different material quality, such as viscosity.
  • the material condition of a material may vary depending on its manufacturing process.
  • the different material properties can lead to the feed pump with a stroke depending on the material properties of each material promotes different amounts of material.
  • the lifting speed of a feed pump be set inversely proportional to the viscosity of the material to be challenged.
  • material containers have different filling heights depending on the production process of the filling material.
  • the invention is the It is an object of the invention to provide a removal device for removing fluid material from at least one material container, which at least partially overcomes the problems mentioned in comparison with known removal devices.
  • the invention proposes a removal device with the features of claim 1.
  • a removal device is characterized in that it comprises a device for determining the filling level of the material in the material container and a device for determining the filling weight of the material container or that they are assigned. Furthermore, the sampling device comprises or is associated with a computing unit, wherein the arithmetic unit determines a density actual value of the density of the material present from the determined values of fill level and fill weight of the material container, with a known or determined container cross section, or is designed to determine it. Furthermore, the removal device is characterized in that an input device for inputting a density preset value and / or a display device is provided.
  • the conveying speed with which the material is conveyed out of the material container by means of the feed pump can be controlled by the control unit as a function of the density preset value of the material.
  • the possible display device shows at least one of the sizes ⁇ ) density actual value of the material or a characteristic value for this, ⁇ ) density default value of the material, ⁇ ) density target value of the density of the material according to a specification and ⁇ ) at least one for the difference between the actual density value and the nominal density value, the density actual value to the density preset value or the density preset value to the density nominal value characteristic value.
  • the removal device for removing fluid material from at least a material container in order to supply it to a processing unit, have a follower plate associated with the respective material container, which rests on the material in the material container or can be placed.
  • a generic removal device which comprises a device for determining the filling level of the material in the material container and a device for determining the filling weight of the material container (or that optionally those of the sampling device are assigned), and that a computing unit is included ( or optionally assigned), which determined from the determined values of filling level and filling weight of the material container, with known or determined container cross-section, a density actual value of the density of the present material or is optionally designed for its detection, and wherein an input device for entering a density Pre-Vorgabehongs is provided, and steer by means of the control unit, the conveying speed, with which the material is conveyed by means of the feed pump from the material container, in dependence on the density default value of the material rbar is.
  • the removal device thus makes it possible to determine the density actual value on the basis of measured values for the filling level height and thus for the filling volume and the filling weight.
  • the filling weight corresponds to the weight that can be determined by subtracting the curb weight from the total weight of the material container. Fill level and / or fill weight can be determined in particular before the beginning of the removal, possibly also before the installation of the material container for removal in the sampling device, by means of corresponding removal device associated facilities.
  • the density actual value is thus determined from measured values, so that the arithmetic unit can also be designed such that it is at multiple determination of the corresponding measured values can determine a standard deviation or variance for the determined density actual value.
  • the filling volume can be determined, for example, by multiplying the measured value for the filling level height and the value for the container cross section.
  • the container cross section may be previously known in standardized material containers, but it is also possible that the container cross section is determined by measurement for Grevolumenbetician.
  • the device for determining the level height may include, for example, a cable or rod sensor or other displacement sensor. It is possible, for example, for the device for determining the filling level height to be realized in that a length measuring instrument assigned to the removal device is used in the manual determination of the filling level height.
  • the means for determining the filling weight may include, for example, a separate scale on which the filling weight is determined prior to installation for the removal of material.
  • the balance can be assigned to the removal device or comprises of the removal device, such as being integrated in it.
  • the means for determining the level height and the means for determining the filling weight may also be integrated into the removal device, that level height and filling weight can be determined during or after connecting the material container to the removal device for the removal of material.
  • the removal device provides means for determining a density actual value
  • the removal device makes it possible to convert from the volume delivered per stroke of the delivery pump to the mass of the material delivered per stroke via the actual density value.
  • the density also allows an estimation of the delivery behavior, such as the Schöpf s, which can thus be considered accordingly in the control of the feed pump.
  • the input device may be designed such that the determined density actual value is automatically defined as the density preset value, as a function of which the conveying speed of the material is controllable by the control unit.
  • the input device may possibly also be realized alone by a programming line in the programming of the control unit.
  • the input device can also be designed so that it allows a manual input of a density default value, wherein it is up to the user of the sampling device, whether he accepts the density actual value as a density default value or, for example, a density setpoint from the data sheet of Manufacturer or according to another specification, such as measurement specification or a specification about a material standard, as the density default value.
  • the density default value may also be determined as a function of the standard deviation of the determined density actual value in accordance with the determined density actual value or the density nominal value or an arbitrary density value weighted, for example, via the standard deviation.
  • the mass delivered per time interval can be precisely determined or adjusted by the invention to a particular extent for each material so that a mass ratio of the respective materials within very narrow tolerance limits is also mixed within a material mixture which is mixed, for example, in a mixing device arranged downstream of at least one removal device is achievable.
  • a generic removal device which includes a device for determining the level height of the material in the material container and a Means for determining the filling weight of the material container comprises (or that optionally those of the sampling device are assigned), and that includes a computing unit includes (or optionally assigned), which from the determined values of filling level and filling weight of the material container, with a known or determined container cross-section, a Density actual value of the density of the present material is determined or optionally designed to determine it, and wherein a display device is provided, which at least one or more or all size from the group ⁇ ) ⁇ ) ⁇ ) ⁇ ), namely of ⁇ ) density -Istand value of the material or a characteristic value for this ⁇ ) density default value of the material ⁇ ) density target value of the density of the material according to a specification and ⁇ ) at least one for the difference between actual density value and nominal density value, density actual value Density default value or Density default value Density setpoint indicates characteristic value.
  • the at least one of the variables of ⁇ ) density actual value, ⁇ ) density default value, ⁇ ) density setpoint and ⁇ ) difference of density actual value to density setpoint, density actual value to density default value or Density default value indicative of density setpoint, the user of the device are given in a removal device according to the invention, based on which he can correlate a supported volume with a conveyed mass, so that he determined a speed of conveyance based on the delivered per time interval mass of the material can.
  • the variables ⁇ ) density actual value, ⁇ ) density default value and ⁇ ) density target value are preferably indicated in combination.
  • the quantities ⁇ ) density actual value, ⁇ ) density default value and at least one of the variables ⁇ ) are preferably the difference between the actual density value and the nominal density value, the actual density value with the density preset value or the density preset value with the density nominal value in combination specified. From the size ⁇ ) difference between the actual density value to the density setpoint, the actual density value to the density standard value or the density preset value to the density nominal value is generally specified within the scope of the invention, preferably at least one of them, more preferably two or more or all of this group. For example, based on the displayed magnitudes, a user may, for example, manually, such as by manual adjustment, engage the control unit of the sampling device to adjust the desired conveying speed.
  • a user can use the display device to estimate, for example, whether the preset stroke frequency of a feed pump for realizing a desired conveying speed with regard to the difference size actually leads to the desired conveying speed, ie the desired delivery of a certain mass per time interval.
  • the display device can also display other relevant for the promotion data, such as the current filling volume of the material container, which may be important both for the estimation of the residual amount itself and for the control of the conveying speed, for example, if it should be ensured that the material container is emptied after a certain time, possibly simultaneously with another of the removal device associated container.
  • both input device and display device in a sampling device according to the invention, it may be possible for a user of the sampling device to obtain information about at least one density value of density actual value, density default value or density nominal value and / or corresponding differences
  • a user of the sampling device may obtain information about at least one density value of density actual value, density default value or density nominal value and / or corresponding differences
  • the input device it can have the possibility of correcting the conveying speed by inputting or correcting the density preset value in such a way that the control unit controls the conveying speed as a function of the newly entered or corrected density preset value.
  • the control of the conveying speed by means of the control unit in dependence on the density preset value can take place in various ways.
  • the density default value may be a parameter in a function with which the control unit determines a required delivery of a mass per time and adjusts the manipulated variables, such as the stroke frequency of the feed pump.
  • the density default value is used by the control unit for controlling the conveying speed by the control unit changing the stroke frequency of the feed pump, and thus the conveying speed, in stages with respect to the input density preset value.
  • the respective devices and / or units that can be assigned to the removal device can be part of the removal device, even if this is not explicitly stated in each case.
  • the devices and units assigned to or assigned to the removal device can be part of the removal device.
  • the respective devices and units assigned to or assignable to the removal device can be configured as described in accordance with their described optional configuration.
  • the removal device may comprise a device for determining the filling level of the material in the material container and a device for determining the filling weight of the material container.
  • the extraction device may comprise a computing unit which determines from the determined values of fill level and fill weight of the material container, with known or determined container cross-section, a density actual value of the density of the present material, in particular in combination with a device for Determining the filling level of the material in the material container and a device for determining the filling weight of the material container.
  • the removal device may comprise an input device for inputting a density preset value, wherein the conveying speed with which the material is conveyed out of the material container by means of the feed pump can be controlled by the control unit as a function of the density default value of the material or controlled.
  • the removal device may comprise a display device which has at least one size of ⁇ ) density value of the material or a characteristic value ⁇ ) density default value of the material ⁇ ) density target value of the density of the material according to a specification and ⁇ ) indicates at least one value characteristic of the difference between the actual density value and the nominal density value, the actual density value from the density preset value or the density preset value from the density nominal value.
  • This display device can be provided in particular in combination with the aforementioned input device.
  • control unit may be configurable or configured to control the conveying speed in response to a deviation of the input density preset value from the density setpoint.
  • This can be, for example be advantageous when a certain conveying speed or stroke frequency of the feed pump is preset for a material, wherein the default was set on the basis of a density setpoint of the material in the material container.
  • the conveying speed or stroke frequency of the feed pump can be controlled in accordance with the said deviation by the control unit.
  • the removal device can be assigned at least two material containers or provided thereon, each containing material, wherein the display device displays at least one of the variables ⁇ ) to ⁇ ) for each material from the respective material container.
  • the density values that can be used to determine the mass delivered per time interval on the basis of the manipulated variables of the control, such as the stroke frequency of the feed pump, may be displayed, so that a delivery speed with respect to the conveyed mass per time may be determined for each material can. This is advantageous, for example, in feeding different materials from different material containers to a mixing device or to a processing unit in which materials are mixed.
  • the input device or the control unit may be in an operating state in which the entered density default value is the actual density value.
  • the actual density value can be reliably determined without major measurement errors, so that the conveying speed, which is based on the actual density of the material, is determined by the corresponding operating state in which the density preset value is the density actual value so that the most accurate possible promotion of a given mass per unit time can be guaranteed.
  • the input device or the controller is in an operating condition in which the density default value is a value between the actual density value and the density setpoint.
  • the density default value is a value between the actual density value and the density setpoint.
  • the conveying speed can be set or controlled as a function of volume flow and related to a mass flow by means of the density default value, the mass flow determined in this way being compared with a desired mass flow.
  • the flow-dependent adjustment or control of the conveying speed can be realized, for example, by specifying the stroke frequency of the feed pump.
  • the conveying speed can be related to a mass flow via the set or controlled or regulated volume flow, and by comparison with a desired mass flow, the user of the unloading device can obtain information about the mass amount delivered per time to a processing unit downstream of the removal device, which may be important for the control of the conveying speed or else for the setting of further steps in the working process in the processing unit.
  • At least two material containers each having different materials A and B can be connected to the removal device, and the control unit can be configured or configured in such a way that the delivery speeds of the respective materials can be controlled as a function of the density preset value of the respective material.
  • At least two material containers, each with different materials A and B, are connected to the sampling device, and the control unit is configured such that the conveying speeds of the respective materials can be controlled or controlled in dependence on the density preset value of the respective material.
  • control unit can be configured or configured such that the materials A and B are conveyed in a predetermined mass ratio within given tolerances.
  • the material composition of the material mixture used in a processing method comprising the materials A and B can be determined within predetermined tolerances, whereby the quality of the product produced by the processing method can be improved.
  • the tolerances may be selected, for example, device-related, in which case device-related funding and Zu entryenautechniken may be considered.
  • the tolerances can also be set so that if the mass ratio deviates from an "ideal mass ratio" which corresponds to a desired stoichiometric composition of the material mixture consisting of materials A and B, the quality tolerances for the processing method can not be expected for the specified tolerances ,
  • control unit can be configured or configured such that taking into account the density default value at least one of the materials, the conveying speed of at least one of the materials in the direction of such a target conveying speed is changed, that both material containers are emptied simultaneously.
  • control unit is configured such that, taking into account the density preset value of at least one of the materials, the conveying speed of at least one of the materials is changed in the direction of such a desired conveying speed that both material containers are simultaneously emptied.
  • the target conveying speed corresponds to the conveying speed at which the relevant material containers are simultaneously emptied.
  • the conveying speed can be changed only in such a framework towards a corresponding desired conveying speed, that this has no adverse effects the quality of the product or the mixture of materials used in the processing unit.
  • control unit can be configured or configured in such a way that, taking into account the actual level of the two or more material containers, the conveying speed of at least one or more of the materials is changed in the direction of such a desired conveying speed that both material containers are simultaneously emptied.
  • the actual level can, for example, before the first material removal from a material container However, it can also be determined, for example, continuously during the removal process, continuously or at certain intervals.
  • the actual filling level can be calculated back to the filling volume located in the material container at the time of determination of the filling level, whereby a simultaneous emptying of the material container connected to the sampling device can be controlled improved.
  • the control unit can also be configured or configured in such a way that the change in the conveying speed of the materials, taking account of predetermined tolerances, takes place at the conveying speed of the materials determined as a function of the density preset value.
  • a conveying speed as described above can be determined as a function of the density preset value, and tolerances can be predefined by this ascertained conveying speed, within which the conveying speeds can be changed to achieve a specific target, such as simultaneous emptying.
  • a specific target such as simultaneous emptying.
  • control unit may comprise an input device into which an input value of the density of at least one of the materials is input, which is equal to the density actual value of the respective material or represents a lying between the density actual value and the density setpoint of the density value, wherein the conveying speed of the respective material is controlled in the direction of a density-corrected conveying speed.
  • control unit may comprise an input device into which an input value of the density at least one, several or all of the materials which is equal to the density actual value of the respective material or represents a density value lying between the density actual value and the density nominal value of the material, wherein the conveying speed of the respective material is in the direction of a density-corrected conveying speed is controlled.
  • the conveying speed of the respective material which is due to operating parameters or is set to be controlled in the direction of a density-corrected conveying speed, so that taking into account all operating parameters, such as the simultaneous emptying of the material container or the maximum / minimum feed pump performance, a correction in With regard to an optimized mass flow can take place.
  • the removal device can also be configured such that the fill level can be detected or detected in at least one or all of the material containers during their emptying.
  • the extraction device may be configured so that the level height is detected in at least one or all of the material container during its emptying.
  • the device can also be configured so that the resulting removal volume of the material is determined at different times of the removal of material from a container due to the level height change with known or predetermined container cross section and with the determined on the basis of a time-dependent mass or volume flow of the material removal volume is correlated.
  • corrections can be made, for example, in the control unit with respect to the respectively obtained measured values, whereby a Particularly good control of the conveying speed and thus the promotion of the material can be guaranteed.
  • a warning device may be provided which emits a warning signal when a specified conveying speed of the respective material is exceeded or fallen below.
  • the conveying speed can relate both to the promotion of a certain mass per time interval and to the promotion of a specific volume per time interval.
  • a corresponding determination of the conveying speed can take place, for example, on the basis of the density default values or the density setpoint values or the density actual values of the materials to be conveyed.
  • the warning signal may inform a user of the sampling device that the conveying speed is outside the predetermined tolerances, which may cause, for example, a defective material composition in the material mixture finally used in the processing unit.
  • a display may be provided in the sampling device, which displays at least one or more of the operating parameters of the sampling device from a) fill level of the container, b) density setpoint, c) density actual value, d) flow rate, e ) Mass flow, f) density default value and / or g) residual amount or residual weight in the material containers, each independently selected with respect to one or more of the material containers. If necessary, this can apply to all of the parameters. This allows the user of the sampling device comprehensive information about the operating state of the sampling device, in particular with respect to the promotion of the respective materials win.
  • the invention comprises a control device for a removal device, wherein the control unit is a control unit for controlling the mass flow of at least one subsidized Material includes.
  • the invention also encompasses a method of removing a fluid material from at least one material container and feeding the material to a processing unit, the material being conveyed out of the material container by means of a feed pump, and the amount of material leaving the material container at a certain time interval is controlled by the feed pump is controlled.
  • the level of the material in the material container and the filling weight of the material container is determined and determines therefrom a density actual value for the density of the material.
  • a density default value is input and / or at least a quantity of ⁇ ) density actual value of the material or a characteristic value for this, ⁇ ) density default value, ⁇ ) density target value of the density of the material according to a specification and ⁇ ) at least indicates a value characteristic of the difference between actual density value and nominal density value, actual density value to density standard value or density preset value to density nominal value.
  • the removal device according to the invention and the control for these are particularly preferably used in the production of plastic components, so that the processing unit is preferably a plastic processing device.
  • the at least one or even the two different fluid materials can therefore be supplied to the plastics processing machine as described within the scope of the invention in order to produce the plastic component.
  • the supplied materials may be various components of a polymeric material, such as different polymer components as base materials, polymer component and hardener, polymer component and coloring component, or the like.
  • the polymeric material may in particular be a plastic material, including polymers with inorganic constituents such as siloxanes, silicone compounds or the like, or organic polymers.
  • the invention is not limited to this field of application.
  • FIG. 1 shows a side view of a removal device according to the invention 1.
  • the removal device 1 is associated with a material container 2, which stands on a base plate 3 of the removal device 1.
  • the removal device 1 is associated with a device for determining the filling weight, which in Fig. 1 is not shown and on which the material container 2 is weighed to determine the filling weight before the material container 2 for the removal of material in the removal device 1 is installed.
  • On the fluid material in the material container 2 is for removal or promotion a follower plate 4. Connected to the follower plate is a positive displacement pump 5 for conveying the material.
  • the follower plate 4 is introduced via a holding device 6 in the material container 2, wherein in the holding device 6, a device for determining the level height of the material in the material container 2 is integrated.
  • the level in the material container 2 can be determined via the Absenkumble via which the follower plate 4 is inserted by means of the holding device 6 in the material container 2 until it rests on the material in the material container 2.
  • the fill level can be determined for example via a cable or Wegmesssensor. It is also possible to determine the fill level via a rod sensor, which is immersed in the material container 2.
  • the illustrated removal device 1 comprises a control unit 7, which comprises a computing unit 8, which is designed to obtain the density actual value from the measurements for the fill weight and the fill level obtained from the device for determining the fill level and the device for determining the fill weight to determine.
  • Control unit 7 and arithmetic unit 8 can be designed such that control unit 7 and arithmetic unit 8 also control the device for determining the filling level height and the device for determining the filling weight so that an automatic detection of the measured values and calculation of the density actual value can take place ,
  • the diameter of the resting on the material in the associated material container 2 follower plate 4 is stored in the arithmetic unit 8, so that the arithmetic unit 8 from the stored value for the diameter of the follower plate 4 and the determined level height can determine the filling volume of the material in the material container 2. Furthermore, in the arithmetic unit 8, the empty weight of the material container 2 standardized with respect to its opening diameter is stored for different types of material containers, so that the arithmetic unit 8 determines the filling weight in the material container 2 by subtracting the total weight of the material container 2 determined by the device for determining the filling weight can.
  • Programs for error evaluation can also be used in the arithmetic unit 8, so that a standard deviation can be indicated by the arithmetic unit 8 for the respectively determined measured values for fill level and fill weight and the density actual values determined therefrom.
  • the control device 7 further comprises an input device 9, with which a density preset value can be input, in response to which the control unit 7 controls the stroke frequency of the positive displacement pump 5.
  • the arithmetic unit 8 is designed to determine a desired conveying speed of the material as a function of the density preset value of the material and to determine the stroke frequency as a manipulated variable for the control unit 7.
  • the removal device 1 shown comprises a display device 10 which displays the actual density value and the density preset value of the material.
  • a user of the removal device 1 can recognize whether the density default value underlying the control of the conveying speed agrees with the density actual value.
  • the user may make an input of a density preset value into the input device 9 on the basis of the density values displayed in the display device 10.
  • the user is allowed to regulate the density default value depending on the information provided to him by the display device 10 by means of the input device 9, whereby a user can regulate depending on from which density value the calculation of the manipulated variables for the control unit 7 for actuating the positive displacement pump 5 is calculated.
  • FIG. 2 is schematically the operation of a removal device 1 with two material containers 2, 2 'shown.
  • the described mode of operation relates to a removal device 1 which supplies two different materials A, B from two different material containers 2, 2 'to a mixing device of a processing unit, such as an injection molding device.
  • the filling level height and the filling weight of the two material containers 2, 2' are fed to each of the two material containers 2, 2 'via the device for determining the filling level height and via the device determined to determine the filling weight.
  • the density actual value for the density ⁇ A of the material A and the density actual value for the density ⁇ B of the material B are calculated via the arithmetic unit 8.
  • a density setpoint ⁇ ' A or ⁇ ' B is furthermore stored for each of the materials A and B.
  • the setpoint density values ⁇ ' A and ⁇ ' B can also be input via the input device by the user, for example from the manufacturer data sheet enclosed with the respective material container 2, 2 ', via the input device.
  • step 103 the input of the density default values ⁇ " A , ⁇ " B by means of the input device 9 takes place.
  • the input of the density default values ⁇ " A , ⁇ " B can take place automatically, for example by assuming the density value.
  • Actual value ⁇ A , ⁇ B for the respective material, as well as for example manually or by selection of by the arithmetic unit 8 determined default values that can be displayed on the display device 10.
  • the arithmetic unit 8 determines the manipulated variables for the control of the positive displacement pump 5 by the control unit 7 in operation 104.
  • the positive displacement pump 5 is controlled by the control unit 7 and conveys the materials A and B in the conveyor speed predetermined by the control unit.
  • operating parameters for conveying the materials A and B can be displayed via the display device 10. such as the volume flow, the mass flow and / or the actual density value.
  • the volumetric flow conveyed by the positive-displacement pump 5 is measured in step 106 via a volumetric flow meter, with control of the stroke frequency of the positive-displacement pump via the measurement of the volumetric flow.
  • the density preset values ⁇ " A and ⁇ " B stored in the control unit 7 can be converted from the measured volume flow to a mass flow and this mass flow compared with a respective desired mass flow for the respective materials A and B. be, depending on the result of the comparison via the control, a correction of the stroke frequency of the respective material containers 2 associated displacement pump 5 can be done.
  • an in Fig. 2 Timing circuit can be provided, via which the fill level height in the material containers 2, 2 'is determined again as in step 101 after a certain time interval.
  • the newly determined level height can then be detected in the control unit 7 and serve, for example, to determine a volume delivered in a specific time interval, which then, for example, with a measured or over the number of strokes determined conveyed volume can be correlated, whereby corrections for a precise control of the conveying speed can be made.
  • the fill levels determined in this case can also be taken into account in the calculation of the manipulated variables, for example for the realization of an emptying of the material containers 2, 2 'which is as simultaneous as possible.
  • FIG. 3 is an inventive step 103 for inputting the default values ⁇ '' A , ⁇ '' B shown schematically.
  • the density actual value ⁇ A , ⁇ B determined by the arithmetic unit 8 is represented by the display device 10.
  • the display device 10 simultaneously displays the density set point ⁇ ' A , ⁇ ' B for the two materials.
  • the user of the removal device according to the invention can thus make a decision on the basis of the illustrated density actual values and density setpoints, which density default value is input via the input device.
  • the user checks whether the density setpoint ⁇ ' A coincides with the actual density value ⁇ A. If this is the case, the user proceeds by setting the default value ⁇ " A through the actual density value ⁇ A and thus simultaneously through the density setpoint ⁇ ' A. If the density target value ⁇ 'A in the step 202 is not ⁇ with density value A coincides, the user of the removal device 1 has the opportunity to make a manual entry for a value of the density for the material A in the step 203 or either the Density setpoint ⁇ ' A or to select the actual density value ⁇ A.
  • the user sets either the density set point ⁇ ' A or the density actual value ⁇ A or the manually entered value for the density for the material A as the default value ⁇ " A , depending on which the arithmetic unit 8 the manipulated variables for the control of the positive displacement pump 5 determined.
  • an analog input or definition for the default value ⁇ '' B for the material B takes place.
  • FIG. 4 the operation 104 in a removal device 1 according to the invention for the calculation of the manipulated variables from the default values ⁇ '' A and ⁇ '' B for the control of the positive displacement pump 5 by the control unit 7 is shown schematically.
  • the conveying speed V A of the material A is set.
  • the determination can also be carried out by the input device or else be determined by an internal logic in the arithmetic unit 8.
  • the conveying speed V A for the material A is given in the present embodiment as a promotion of a mass unit per time.
  • the conveying speed V A must be determined in consideration of the subsequent processing method, since the conveying speed V A determines the speed at which the material is supplied to the processing unit or mixing device, taking into account that the conveying speed is selected so that it neither to a material jam still comes to a lack of material in the mixing device or processing unit.
  • the conveying speed V B of the simultaneously conveyed with the material A material B is set in the further course of the calculation of the manipulated variables as explained below as a function of the conveying speed V A for the material A.
  • the parameters are determined in the arithmetic unit 8, based on which the arithmetic unit 8 determines the manipulated variables for the control of the conveying speed by the control unit 7.
  • the conveying speed V A the density default values ⁇ " A and ⁇ " B
  • the fill levels H A and H B the mass ratio m A / m calculated stoichiometrically for the material mixture to be achieved or desired for the processing method B as a parameter for further calculation in the arithmetic unit 8 set.
  • step 303 it is determined whether the conveyor speeds V A and V B should be coordinated so that the materials A and B in the predetermined mass ratio m A / m B are promoted within predetermined tolerances or that the two material containers 2, 2 '' emptied as possible at the same time. In this case, the selection can be made both automatically and via the input device 9 via the user.
  • the stroke frequency of the positive displacement pump 5 can be selected, so that the arithmetic unit 8 first determines a ratio for the mass-related conveying speeds V A and V B on the basis of the mass ratio m A / m B , then the velocity V B from the predetermined velocity V A determines and then calculates the stroke frequency of the SVerdrängerpumpe 5 taking into account the volume delivered per stroke, the corresponding density default value ⁇ '' A , ⁇ '' B and the corresponding speed V A and V B and to the control unit 7 for controlling the positive displacement pump 5 transmitted.
  • step 305 a conveying speed V ⁇ B is determined from the known conveying speed V A and the known density default values ⁇ " A and ⁇ " B , by determining the speed V ⁇ B from the speed V A and from the mass ratio m A / m B is determined.
  • the determination of the conveying speed V ⁇ B thus corresponds to the definition of the conveying speed V B in the working step 304, exclusively taking into account the desired mass ratio m A / m B.
  • tolerances for the velocity V ⁇ B are then defined, within which the conveying speed for the material B, which is ultimately used to determine the manipulated variables for the control of the positive displacement pump 5, may be established.
  • the tolerances for the velocity V ⁇ B are determined with regard to which deviation from the desired mass ratio m A / m B for the material mixture consisting of the material A and B is acceptable in the processing method.
  • a tolerance range ⁇ V ⁇ B is then calculated by V ⁇ B , within which the conveying speed with which the material B is ultimately conveyed must lie.
  • the conveying speed V HB is determined, which would lead to a simultaneous emptying of the material containers 2, 2 'with the materials A and B.
  • the velocity V HB is thus determined from the velocity V A , the calculation being based on the ratio of the fill level heights H A to H B and the density default values ⁇ " A and ⁇ " B.
  • step 309 it is then determined whether the conveying speed V HB , which would lead to a simultaneous emptying of the material containers 2, 2 ', within the tolerance range .DELTA.V ⁇ B by the speed V ⁇ B , based on the mass ratio m A / m B. was determined lies.
  • the stroke frequency for the positive displacement pump 5 is calculated by the arithmetic unit 8 in operating step 310 from the conveyor speeds V A and V HB , taking into account the density default values ⁇ " A and ⁇ " B , as the manipulated variable is used by the control unit 7 for controlling the positive displacement pump 5.
  • step 311th If V HB is outside the tolerance range .DELTA.V ⁇ B is the conveying speed V 'B such determined from the tolerance range .DELTA.V ⁇ B and the conveying speed V HB that V' B at the velocity V HB next available edge of the tolerance range .DELTA.V ⁇ B is selected in the step 311th This ensures compliance with the desired mass ratio of the materials A and B in the mixing material ultimately used in the processing method, within tolerances, and at the same time ensures that the material containers 2, 2 'emptying as simultaneously as possible.
  • the manipulated variables are then calculated by the control unit 7 by the arithmetic unit 8 for controlling the positive displacement pump 5 from the speeds V ' B and V A and the density default values ⁇ " A and ⁇ " B.
  • the materials A and B are examples of components of a polymeric material, such as a plastic material.
  • the materials A and B are here, for example, 2 polymer components of a 2-component material or polymer and hardener.
  • the processing unit here is a plastic processing device for producing a plastic article, for example an injection molding machine, without being limited thereto.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP12163607.0A 2011-04-13 2012-04-10 Dispositif d'extraction et commande de celui-ci Active EP2511228B1 (fr)

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DE202011005226U DE202011005226U1 (de) 2011-04-13 2011-04-13 Entnahmevorrichtung und Steuerung für eine solche

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2801462A1 (fr) * 2013-05-07 2014-11-12 ELAST Kunststoffverarbeitungs-GmbH & Co. KG Procédé et dispositif de prélèvement commandé de matériaux liquides à partir de plusieurs réservoirs collecteurs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1808241A1 (de) * 1967-12-05 1969-07-03 Haas Inc John I Verfahren und Vorrichtung zum Austeilen von viskosen Stoffen,wie etwa Hopfenextrakt
US4073409A (en) * 1977-01-12 1978-02-14 Fluid Kinetics, Inc. Hot melt dispenser with removeable pump in follower
DE102005006542A1 (de) * 2005-02-11 2006-08-24 Nordson Corporation, Westlake Vorrichtung und Verfahren zum Verflüssigen und Fördern von einem in einem Fass enthaltenen, verflüssigbaren thermoplastischen Material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1808241A1 (de) * 1967-12-05 1969-07-03 Haas Inc John I Verfahren und Vorrichtung zum Austeilen von viskosen Stoffen,wie etwa Hopfenextrakt
US4073409A (en) * 1977-01-12 1978-02-14 Fluid Kinetics, Inc. Hot melt dispenser with removeable pump in follower
DE102005006542A1 (de) * 2005-02-11 2006-08-24 Nordson Corporation, Westlake Vorrichtung und Verfahren zum Verflüssigen und Fördern von einem in einem Fass enthaltenen, verflüssigbaren thermoplastischen Material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2801462A1 (fr) * 2013-05-07 2014-11-12 ELAST Kunststoffverarbeitungs-GmbH & Co. KG Procédé et dispositif de prélèvement commandé de matériaux liquides à partir de plusieurs réservoirs collecteurs

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EP2511228B1 (fr) 2016-03-02

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