EP2201339A1 - Füllstandsmessvorrichtung für flexible silos - Google Patents
Füllstandsmessvorrichtung für flexible silosInfo
- Publication number
- EP2201339A1 EP2201339A1 EP08805198A EP08805198A EP2201339A1 EP 2201339 A1 EP2201339 A1 EP 2201339A1 EP 08805198 A EP08805198 A EP 08805198A EP 08805198 A EP08805198 A EP 08805198A EP 2201339 A1 EP2201339 A1 EP 2201339A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- sensor according
- level sensor
- silo
- flexible
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
Definitions
- the invention relates to devices for measuring a level in flexible silos.
- the invention relates to capacitive level sensors for measuring a level in a flexible silo, ie in a sack silo, for example polyester fabric capacitive level sensors for liquids and fine, ie fine-grained solids are, for example, from the European patent application EP 0338400 or European patent application EP 0470483 known.
- Document EP 0470483 describes a method for DK compensated capacitive level measurement with a probe arrangement comprising a capacitor for level measurement and a capacitor for DK compensation, which have different capacitive slopes and extend together over a same level height measurement range.
- Document EP 0470483 describes that from the measured value of the level measuring probe and the measured value of the compensation probe, a ratio value Q is formed, which depends solely on the dielectric constant ⁇ r of the filling substance wetting the measuring and compensation probe, and in that the filling level height H of the filling material is determined from the measured value of Level measurement probe is formed, wherein the measured value is electronically corrected with a correction value K, which depends on the geometry and the dielectric of the level measuring probe and the ratio Q.
- silos with flexible outer skin are used.
- such flexible silos are used for example for the breathable and dust-tight storage of grain and feed, food, for wood pellet storage, for the storage of plastic parts, plastic agglomerates and plastic granules and other materials.
- These silos form flexible silos, warehouses of fabric or other flexible materials used, for example, in industrial applications as flex silos.
- This type of limp silos or flexible silos are referred to below as sack silos.
- An expansion of the tissue during filling results in a change of the siloform depending on the filling level.
- An electronic level measurement for these bag silos needs further improvements.
- the present invention has for its object to provide a device for level measurement available that does not have the aforementioned disadvantages or at least reduced, and cost and easily provides a level measurement for bag silos available. This object is achieved by the devices specified in claims 1 and 20.
- a level sensor for determining a level, in particular of bulk materials such.
- Fuels in a silo made of a flexible material, wherein the flexible material forms a flexible container with a flexible wall provided.
- the level sensor includes a first electrode provided adjacent to or within the flexible wall, a second electrode provided at a predetermined distance from the first capacitor electrode and adjacent to or within the flexible wall, including a resonant circuit Sensor electronics, wherein the first electrode and the second electrode are electrically connected to the sensor electronics and electrically isolated from each other, and a control unit which is adapted to convert a value provided by the sensor electronics available value to a level.
- a level-monitored silo made of a flexible material includes a flexible container made of a flexible material having a flexible wall, a frame for supporting the container; a first electrode provided adjacent to or within the flexible wall, a second electrode provided at a predetermined distance from the first capacitor electrode and adjacent to or within the flexible wall, including a resonant circuit Sensor electronics, wherein the first electrode and the second electrode are electrically connected to the sensor electronics and electrically isolated from each other, and a control unit which is adapted to convert a value provided by the sensor electronics available value to a level.
- Fig. Ia shows a schematic representation of a bag silo with a measuring device, which illustrates embodiments of a device for measuring the level of dry contents in a bag silo;
- Fig. Ib shows a further side view of Fig. Ia
- FIG. 2 illustrates further embodiments of a device for measuring the filling level of dry products in a sack silo.
- wood pellets as dry bulk materials.
- the invention is not limited thereto. It can be used as bulk materials and natural products such as grain and feed, plastic components, plastic granules, plastic agglomerates, powders, tablets or a variety of other bulk materials. In general, these are substances that are not provided in the form of a liquid.
- dry is not limited to the fact that the bulk materials can not have any moisture content
- dry refers to the fact that the filling of the container is not or only partially liquid or moist, but in the form of granules, pellets, Brickets or other pieces is introduced into the container. In addition, pasty substances and liquids can be filled into bag silos.
- Fig. Ia and Ib show an embodiment of a sack silo with a level measurement.
- the sack silo comprises a fabric or fabric bag 102 or other pliable, i. flexible material forming the bag 102, and a frame having a frame 101a and a stand 101b supporting the bag 102.
- electrodes for capacitive level measurement are not within the container, i. inside the silo, provided in the form of solid electrodes.
- the electrodes 103 are attached to the tissue within the bag 102 or outside the bag or integrated into the tissue of the bag 102.
- the electrodes are provided at the edge of the container.
- the actual container for infestation with bulk materials is provided by the bag 102.
- the flexible material expands or lengthens during filling by the gravitational force of the filling material.
- the electrodes 103 are connected to a sensor unit 110 via cable 105.
- the sensor unit is connected via a connecting cable 252 to the control unit 250.
- the electrodes 103 are made of metal strips, a foil of electrically conductive material, a stranded wire, a metal mesh, a copper strip or other, preferably flexible and / or flexible, electrically conductive strips.
- the electrodes e.g. in the form of a strand, a band or a knit so that they can follow a change in length of the fabric.
- a band, a knitted fabric or another form of the electrode, for example a conductive band, can be provided flexibly, preferably with an additional extensibility in the longitudinal direction.
- an extensibility may be provided that elastically or only partially elastically corresponds to a modulus of elasticity of 0.01 to 1 kN / mm 2 .
- an elongation ⁇ l / lo of an electrode of at least 1%, or in a range of 1% to 12% may be possible.
- the use of electrically conductive electrodes on the edge of the container, within the bag fabric or on the sack fabric means that despite the suitability for the level measurement of bulk solids, a capacitor is formed from the electrodes 103.
- the capacitors of the electrically conductive strips fastened in the electrodes 103 or in the silo housing form a relatively small capacitance.
- the capacity is up to the filling level 150 (see FIG. 1b) of the bulk goods from the capacity with a dielectric constant of the bulk materials (see area 152). Above the filling level, a region 154 adjoins the dielectric constant of air.
- variable component of the capacitance forms only in a part of the space that is not directly between the electrodes.
- the capacitance of the fill capacitor consisting of the electrodes 103 changes since the range of the dielectric constant of air and the range of the dielectric constant of the bulk material change.
- this arrangement of electrodes may also be used with tissue materials that have sufficient electrical conductivity to comply with explosion protection regulations. These materials may, for example, have an electrical conductivity corresponding to a resistivity of 10 8 to 10 10 ohm-m or more.
- tissue materials that have sufficient electrical conductivity to comply with explosion protection regulations. These materials may, for example, have an electrical conductivity corresponding to a resistivity of 10 8 to 10 10 ohm-m or more.
- it is optionally possible to provide the first and second electrodes for example in the form of a metal strip, a metal mesh, a metal knit, or the like, with an insulating layer or an insulating sheath, before the Electrode is attached to or in the flexible material of the flexible silo.
- the insulating layer or sheath is hereby formed to form an insulation of the electrodes with respect to the flexible material.
- the electrodes with the insulating material may be arranged adjacent to or within the flexible wall.
- the electrodes may thus be either directly adjacent to or separated from the wall by an insulating layer adjacent to the flexible wall. This makes it possible, especially at high conductivities of the flexible fabric of the flexible silo to improve the level measurement.
- the electrodes 103 may run parallel to each other vertically along the outer skin of the bag silo.
- the electrodes can be sewn or woven into the fabric of the sack silo itself, at a parallel distance of about 0.5 cm to about 10 cm.
- the bands may be mounted inside or outside at a parallel distance of about 0.5 cm to about 10 cm.
- FIGS. 1a and 1b the electrodes are shown with dashed lines. This illustrates that the electrodes within the bag may be in contact with the tissue or may be incorporated into the tissue itself.
- the electrodes may also be sewn or attached to the outside of the bag 102.
- the level measuring device described herein can also be used for electrical conductive products or even liquids.
- embodiments and combinations of Embodiments described herein may be used for bulk materials, pastes, or liquids filled into bag silos.
- the arrangement of electrodes given in accordance with embodiments described herein makes possible the use for e.g. Bulk solids and the use of capacitive level measurement for bag silos. The resulting low capacity, however, complicates the measurement of the level.
- the electrodes 103 are connected to lines 105 to a sensor electronics 110. Due to the difficult level measurement, the wires should be as short as possible, preferably they are shorter than 10 cm or even 3 cm.
- a capacitor 120 is additionally provided to the resonant circuit 112 within the sensor electronics 110, which enables a stable behavior of the resonant circuit 112.
- the resonant circuit within the sensor electronics can, for. B. be a Wien-Robinson oscillator. This is preferably an oscillator which oscillates with a sinusoidal oscillation.
- a typical frequency of the resonant circuit in the empty state of the silo is in the range of 70 to 200 kHz, preferably 100-120 kHz. The frequency decreases when the silo is filled.
- the electrodes 103 typically have a capacitance of 70 to 120 pF / m or 25 to 120 pF / m.
- the additional capacitor 120 typically has a capacity of 40 to 60 pF, preferably 47 pF.
- the sensor electronics which may also be located within the silo, be designed explosion-proof.
- the sensor electronics When dealing with substances that can react with oxygen, eg. As fuels, is expected to explode if inside the silo of the combustible material is present as a fine-grained dust in the air. Since little influence can be exerted on the size and density of the dust grains, in particular when filling the silo, the sensor electronics are designed accordingly for explosion protection. For this purpose, sparks on the electrical components within the potentially explosive atmosphere as well as static charging of ungrounded components and hot surfaces are avoided. Another measure for explosion protection is the above-mentioned conductivity of the sacked fabric.
- the sensor electronics 110 can also take place outside. In this case, even with a positioning of the sensor electronics outside of the bag 102, a cable length of the cable 105, as described in other embodiments, can be achieved. According to typical
- the sensor electronics can be provided inside or outside the bag.
- the control unit 250 is typically provided outside the bag 102.
- the output signal of the oscillator 112 located in the sensor electronics 110 is amplified and converted for a microcontroller utilizable signal (square wave signal, PWM signal or analog signal).
- the microcontroller measures the frequency and calculates an average value which it transmits via the line 252 to a control unit 250.
- a field programmable gate array FPGA or the like can also be used.
- control unit the value determined by the sensor electronics is converted in order to be brought into relation to the size of the silo and / or to the silo form.
- the control unit includes a CPU and control devices that allow the level z. B. to visualize or further process. Typically, an alarm can be set when falling below a predetermined level.
- Line 252 also typically powers the sensor electronics and monitors for any malfunctioning to prevent damage or fire by shutting down the sensor electronics in an emergency.
- the control unit switches the sensor electronics off.
- the control unit may further include a memory for storing the values. According to a further embodiment, the control unit may also include other display elements such as a screen, as well as controls such as a keyboard or a mouse to allow a more extensive evaluation of the level. As a result, z.
- control unit can essentially also be replaced by a display unit.
- the sensor electronics directly, for example, a pulse width modulated signal output, which is converted by a display unit in the corresponding display.
- the sensor electronics therefore assumes additional functions, so that the control unit described with reference to the figures can be reduced to a display unit.
- the silo is empty and the control unit stores the signal of the sensor electronics in an empty state.
- the control unit Via an input device, the control unit is supplied with the shape of the silo and its dimensions in a memory. Via a switch a menu "Siloabgl ⁇ ich when empty" can be selected. This allows a level of 0% to be defined. After the silo has been completely filled in, a switch or an input element is used to select a "full-scale silo calibration". This value corresponds to the level of 100%. This allows the control unit to be adjusted to the south, including its dimensions and the maximum filling height. A corresponding memory unit of the control unit can store the values even in the event of a power failure, so that after a power failure no emptying and refilling is necessary.
- a sensor calibration for calibrating the filling level is possible such that the system is put into operation in the empty state. During filling, the system is in operation and measures the values during the filling process. After filling, the system can be calibrated as described above by setting the "full silo" and the measurement data during filling, with the control unit and the sensor electronics turned on throughout the filling process and measuring the level at regular intervals thus to obtain an improved calibration during filling.
- the embodiments according to the invention have the advantage that a capacitive fill level measurement can be carried out in a simple and cost-effective manner for bulk goods or for use in bag silos.
- the problems occurring in this case are caused by an arrangement of the electrodes within the wall or the Tissue of the silo or in direct contact with the wall of the silo inside or outside solved
- the senor contains at least one pair of electrodes, which are connected to a sensor electronics.
- a sensor electronics typically, for example, 2, 3, 4 or more pairs of electrodes may also be provided as capacitor electrodes. In this case, a measurement in different areas of the silo is possible.
- the plurality of pairs may also be connected to a sensor electronics.
- the sensor electronics include means for reducing or preventing static charging of the electrodes.
- pairs of tens diodes and / or resistors are connected to the potential equalization or ground, respectively, by the terminals of the respective electrodes in the sensor electronics.
- the pairs of decimal diodes are typically connected in series with each other, so that only at a predetermined potential difference between an electrode terminal and the potential equalization, for example in the range of 3 V to 12 V, a grounding of the connection to prevent static charges.
- a sensor calibration for calibrating the filling level is possible such that the system is put into operation in the empty state. During filling, the system is in operation and measures the values during the filling process. After filling, the system can be calibrated as described above by setting the "silo calibration in full" and the measurement data during filling.
- FIG. 2 illustrates further embodiments.
- the sack silo in Figure 2 is shown as a larger bag, eg for industrial applications, and includes the Fabric bag 202 and the holder formed by the frame 201a and the stand 201b.
- the embodiments sensor electronics and the control unit can be provided analogously to the embodiments and combinations thereof explained with reference to FIGS. 1a and 1b.
- the shape as well as the properties of the electrodes 103 can also be provided analogously to the embodiments of the electrodes 103 in FIGS. 1a and 1b.
- the bag 202 includes pockets 202 into which the flexible electrodes are inserted.
- the electrodes 203 it is possible for the electrodes 203 to be connected to the pockets at a plurality of positions along the longitudinal direction of the pockets 204 in order to provide uniform expansion of the electrodes when the bag expands.
- the electrodes can also be sewn onto the flexible material of the bag silo.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200720014056 DE202007014056U1 (de) | 2007-10-09 | 2007-10-09 | Füllstandsmessvorrichtung für flexible Silos |
PCT/EP2008/063570 WO2009047310A1 (de) | 2007-10-09 | 2008-10-09 | Füllstandsmessvorrichtung für flexible silos |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2201339A1 true EP2201339A1 (de) | 2010-06-30 |
Family
ID=40111083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08805198A Withdrawn EP2201339A1 (de) | 2007-10-09 | 2008-10-09 | Füllstandsmessvorrichtung für flexible silos |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2201339A1 (de) |
DE (1) | DE202007014056U1 (de) |
WO (1) | WO2009047310A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010005540A1 (de) * | 2010-01-23 | 2011-07-28 | hansaconsult Ingenieurgesellschaft mbH, 21465 | Vorrichtung und Verfahren zur Füllstandsmessung in einem Tank mit flexiblen Wänden |
DE102010024680A1 (de) * | 2010-06-23 | 2011-12-29 | Stefan Peter | Vorrichtung und Verfahren zur lageunabhängigen Füllmengenbestimmung sowie Verwendung |
DE102017001670A1 (de) | 2017-02-19 | 2018-08-23 | LCM Lausitzer Container & Metall GmbH | Container zur Lagerung und zum Transport von Schüttgütern mit einem flexiblen Behälter in einem Gestell |
EP3470802B1 (de) | 2017-10-11 | 2021-03-10 | WIKON Kommunikationstechnik GmbH | Füllstandsmessgerät und verfahren für die bestimmung der menge an schüttgut in einem behälter |
DE102019217024A1 (de) * | 2019-11-05 | 2021-05-06 | Continental Reifen Deutschland Gmbh | Flexibler Medienbehälter |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB819711A (en) * | 1956-03-13 | 1959-09-09 | Simmonds Aerocessories Ltd | Improvements relating to capacitors for gauging liquid contents |
DE8202713U1 (de) * | 1982-02-03 | 1983-07-14 | Hörmann KG Antriebs- und Steuerungstechnik, 4834 Harsewinkel | Torantrieb |
DE3812687A1 (de) | 1988-04-16 | 1989-10-26 | Duerrwaechter E Dr Doduco | Kapazitiver sensor zum bestimmen des niveaus einer fluessigkeit in einem behaelter |
DE4025400C1 (de) | 1990-08-10 | 1992-04-09 | Vega Grieshaber Gmbh & Co, 7620 Wolfach, De | |
DE4217329A1 (de) * | 1991-11-19 | 1993-05-27 | Robert Eith | Siloeinheit |
GB9212032D0 (en) * | 1992-06-05 | 1992-07-15 | Farrell Peter J | Collapsible container apparatus for fluid material |
DE202006009381U1 (de) | 2006-06-14 | 2007-07-19 | Pfister, Andreas | Kapazitive Füllstandsmessvorrichtung für Schüttgüter |
-
2007
- 2007-10-09 DE DE200720014056 patent/DE202007014056U1/de not_active Expired - Lifetime
-
2008
- 2008-10-09 WO PCT/EP2008/063570 patent/WO2009047310A1/de active Application Filing
- 2008-10-09 EP EP08805198A patent/EP2201339A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2009047310A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE202007014056U1 (de) | 2008-12-18 |
WO2009047310A1 (de) | 2009-04-16 |
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