KR101469687B1 - Powder level measuring system - Google Patents
Powder level measuring system Download PDFInfo
- Publication number
- KR101469687B1 KR101469687B1 KR1020140078977A KR20140078977A KR101469687B1 KR 101469687 B1 KR101469687 B1 KR 101469687B1 KR 1020140078977 A KR1020140078977 A KR 1020140078977A KR 20140078977 A KR20140078977 A KR 20140078977A KR 101469687 B1 KR101469687 B1 KR 101469687B1
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- South Korea
- Prior art keywords
- powder
- silo
- sensor
- signal
- weight
- Prior art date
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Classifications
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- 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
- G01F23/20—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 measurement of weight, e.g. to determine the level of stored liquefied gas
-
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G9/00—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
Abstract
Description
One embodiment of the invention relates to a powder level measuring device for measuring the level of powder temporarily stored or continuously supplied in a silo.
Generally, in order to measure the storage state of fluid and powder, a level measuring device for detecting the height of powder and fluid is mainly used by using ultrasonic wave having a non-contact driving principle. Such a detection apparatus using an ultrasonic sensor is largely classified into a device in which the detection distance of the ultrasonic sensor is about 0 to 6 m and a device in which the measurement distance is about 0 to 10 m.
As described above, the oscillation frequency of the ultrasonic sensor in the detection apparatus is about 40 kHz.
Here, the ultrasonic sensor calculates the time from the generation of the ultrasonic wave to the detection of the ultrasonic wave by detecting the signal reflected by the ultrasonic wave generated from the oscillator to the detection object and calculates the detection distance from the sound velocity in the air . That is, it is important to detect the distance from the time when the ultrasonic waves are generated to the time when the ultrasonic waves are reflected and reflected back from the object.
Such a level measuring apparatus using ultrasound is mainly used in the case of having a plane surface such as a liquid, because ultrasonic waves are well reflected on the surface of the plane.
In recent years, a level measuring apparatus using ultrasonic waves has been applied to powder, and it is mainly applied to a powder having uniform surface and a flat surface with uniform particle size. In order to measure the level of powder composed of such uniform particles, an ultrasonic sensor having a detection distance of 1 to 10 m with a frequency of 40 kHz was mainly used.
However, in the conventional powder level measuring apparatus, when the particles of the powder stored in the storage tank are large or irregularly stacked, the ultrasonic wave irradiated by the ultrasonic sensor fixed at a fixed position on the upper end of the storage tank, So that the signal reflected by the ultrasonic sensor is weak and it is difficult to measure.
Further, when the powder is drawn or drawn into the large-sized storage tank, the stacking height of the powder becomes very irregular, so that it is difficult to accurately measure the powder level.
One embodiment of the present invention provides a powder level measuring device capable of continuously measuring the level of powder inside a silo.
A powder level measuring apparatus according to an embodiment of the present invention is installed in a silo storing a powder to measure the level of the powder, and includes a sensing sensor having an upper portion fixed to the inner wall of the silo to sense the weight of the powder. A conical device formed in a conical shape and connected to a lower portion of the sensor through a cable and positioned inside the powder; And a control unit for receiving the weight information of the powder applied to the outer surface of the cone device, which is sensed by the sensing sensor, to be electrically connected to the sensing sensor on the outside of the silo, Processor.
The weight information of the powder may be the magnitude of the surface tension or pressure on the outer surface of the cone device.
The sensing sensor may be a weight sensor or a pressure sensor.
The detection sensor may have a five-letter shape or a cylindrical shape.
Wherein the microprocessor comprises: a signal receiving unit for receiving weight information of the powder sensed by the sensing sensor; A signal converter for converting the weight information of the received powder into an analog signal; A communication unit for transmitting the converted signal to the outside; A display unit for outputting the converted signal to the outside, or converting the converted signal into a digital signal and outputting it to the outside; And a controller for controlling the operation of each component.
According to another aspect of the present invention, there is provided an apparatus for measuring the level of powder placed on a silo for storing powder, comprising: a support bar having one side fixed to an inner side wall of the silo; A sensing sensor fixed to an upper portion of the support bar to sense the weight of the powder; And a microprocessor formed to be electrically connected to the sensing sensor outside the silo, receiving the weight information of the powder sensed by the sensing sensor, processing the signal, and transmitting the signal to the outside.
The sensing sensor may be fixed in a direction perpendicular to the longitudinal direction of the support bar.
Since the powder level measuring apparatus according to an embodiment of the present invention measures the weight information of the powder on the upper part of the cone device connected to the sensing sensor or the sensing sensor provided in the silo, the level of the powder in the silo is continuously measured .
1 is a view showing the inside of a silo equipped with a powder level measuring apparatus according to an embodiment of the present invention.
2 is a block diagram schematically illustrating the microprocessor of FIG.
3 is a view showing the interior of a silo equipped with a powder level measuring apparatus according to another embodiment of the present invention.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which those skilled in the art can readily implement the present invention.
FIG. 1 is a view showing the inside of a silo equipped with a powder level measuring apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram schematically showing the microprocessor of FIG.
Referring to FIG. 1, a powder
The
The
The weight sensor may be a sensor device such as a load cell for measuring the weight of the
The pressure sensor measures the magnitude of the pressure according to the weight of the
Further, the pressure sensor may be formed of a molded interconnection device (MID). That is, the pressure sensor can be obtained by forming a body part by molding into a predetermined shape by injection molding or the like and forming a conductor pattern on the surface of the body part, for example, by using a ceramic material. As the molding method, various known methods of MID (for example, UV exposure method (subtractive method, semi-additive method, additive method and the like), laser imaging ) Method, the IVOND method, or the two-time molding method such as the SKW method, or the like). The body portion can be molded by a powder injection molding method CIM using powder of ceramic injection molding (ceramics) as a raw material. That is, the body part specifically includes a binder (acting as a filler fluidity and a shaping property to a mold), a low molecular weight component such as wax, a high molecular weight component such as a thermoplastic synthetic resin, A so-called green body is formed by an injection molding machine equipped with a mold, and then a degreasing agent for removing the binder and a powder are heat-treated at a temperature equal to or lower than the melting point, A predetermined shape can be obtained by sintering in which bonding occurs between particles. In this case, the binder may be a material which can mold a molding material and decompose and volatilize by overheating and degreasing. As an example, a material having a composition of 55% (mass%) of polystyrene, 25% of paraffin wax and 20% . The amount of the binder used is, for example, about 15 to 25% (mass%) of the binder relative to 100% of the ceramic powder. In addition, it is possible to increase the toughness by incorporating silica or zirconia into the ceramics powder. Further, the body portion can be formed by compression molding (press molding) of ceramic. In this case, for example, a binder having a composition of 100% (mass%) of an acrylic polymer or 100% of PVA (polyvinyl alcohol) can be used. The binder is used in an amount of 4 to 6 % (% By mass). In addition, the body may be formed into a predetermined shape by injection molding or the like, taking an insulating resin material (for example, various engineering plastic materials such as polyamide or polyphthalamide) as a base material, And can be obtained by molding a conductor pattern and can be obtained by forming a conductor pattern on the surface of the substrate by a known method of MID (for example, UV exposure method (subtractive method, semi-additive method, additive method, etc.), laser imaging method, IVOND method, A molding method, a two-time molding method such as the SKW method, and the like).
The weight of the
The
The
The
2, the microprocessor includes a
The
The
The
The display unit 144 outputs the signal converted by the
The
The powder
The powder
3 is a view showing the inside of the
3, a powder
The powder
The
The
The
The powder
The
The olefin-based resin preferably contains 25 to 39% by weight of the ultrafine crystalline resin and improves the flowability of the inorganic filler and improves the heat resistance, rigidity and thermal deformation of the polyolefin resin composition. When the amount of the inorganic filler is less than 25% by weight, the inorganic filler is excessively used to lower the flowability and moldability of the resin. If the amount is more than 39% by weight, the injection molded product is not effective in improving the strength, impact resistance and dimensional stability I have a problem. Specifically, the ultra-crystalline olefin-based resin may be an isotactic polypropylene, a propylene-ethylene copolymer, a propylene-1-butene copolymer, a propylene-1-hexene copolymer and a propylene- Polymer, and a copolymer or random copolymer of propylene or a mixture thereof.
The olefin resin preferably has a melt index of 1 to 70 g / 10 min (230 ° C), more preferably 3 to 30 g / 10 min.
It is preferable that the isotactic peptad fraction of the homo part in the olefin resin is 96 to 99% by C13-NMR. If it is less than 96%, the heat resistance, rigidity and heat change of the polyolefin resin composition are deteriorated .
The inorganic filler is preferably glass fiber, barium sulfate, or a mixture thereof. The inorganic filler includes 61 to 75% by weight of the inorganic filler and improves strength and impact resistance during injection molding. If the amount of the inorganic filler is less than 61% by weight, the strength and impact resistance are lowered and the problem is caused by the low weight. When the inorganic filler is more than 75% by weight, the production process is not smooth due to high weight and high rigidity.
The glass fiber preferably has a chopped strand shape having an average particle diameter of 5 to 15 탆 and a length of 1 to 16 mm. When the average particle diameter is less than 5 탆, the glass fiber tends to be broken during mixing The stiffness effect is insufficient. When the thickness exceeds 15 탆, the deformation of the molded article may be deteriorated and the appearance of the molded article may be deteriorated. If the length is less than 1 mm, the strength, impact resistance and weight are lowered. If the length is more than 16 mm, it is difficult to input the material in the processing step. Specifically, it is preferable that the glass fiber is a glass fiber whose surface has been treated with a modified polypropylene obtained by grafting an unsaturated carboxylic acid or its anhydride. In the case of injection molded articles, the strength, impact resistance and heat resistance of the molded article are improved . The unsaturated carboxylic acid is preferably one selected from the group consisting of acrylic acid, tricrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, ditralic acid, sorbic acid and phosphoric acid, and the anhydride is preferably an acid anhydride, an ester, And metal salts, and specific examples thereof include maleic anhydride, itaconic anhydride, anhydrodithioconic acid, sodium acrylate, and sodium methacrylate. In order to treat the surface of the glass fiber, it is preferable to use a modified polypropylene prepared by charging an unsaturated carboxylic acid or its anhydride and a catalyst to a crystalline polypropylene into a twin-screw extruder and melting by heating at 180 to 220 ° C , The modified polypropylene and the glass fiber are preferably treated at a ratio of 1: 9.
The barium sulfate preferably has an average particle diameter of 0.5 to 1 μm by laser diffraction scattering. When used in combination with glass fibers, the barium sulfate plays an effective role in exhibiting high weight characteristics. If less than 0.5 μm, high weight and high rigidity properties And it is difficult to inject in the processing step. When the thickness exceeds 1 탆, there is a problem that the gloss of the surface appearance of the molded article is lowered during the production of an injection molded article.
When the glass fiber and barium sulfate are mixed and used as an inorganic filler, the mixing ratio of glass fiber and barium sulfate is preferably 2: 8 to 8: 2, more preferably 4: 6 to 5: 5.
In addition, the polyolefin resin composition can be applied based on the production method and processing conditions of the resin composition known in the art. For example, polypropylene may be blended at the melting point or higher and used. That is, the polyolefin resin composition can be used for producing a case through a conventional molding method such as injection molding and extrusion molding.
Hereinafter, the polyolefin resin composition will be described by way of examples.
≪ Examples 1 to 4 and Comparative Examples 1 to 4 >
An olefin resin and an inorganic filler were charged into a hopper of a kneading extruder after being dry-blended in a ribbon mixer for 1 to 4 hours, and melt kneaded at 185 to 215 ° C to prepare a polyolefin resin composition. The contents are shown in Table 1 below.
Filler
(1 to 70 g / 10 min, ethylene unit content: 10.5 mol%, isotactic peptad fraction: 96 to 99%) was used as the olefinic resin, and the glass fiber-1 The glass fiber-2 has an average particle diameter of 9 to 13 탆 and a length of 10.0 to 15.0 mm, and the glass fiber-3 has an average particle diameter of 28 to 32 탆 , And a length of 3.0 to 4.5 mm is used.)
<Test Example>
In order to measure the mechanical properties of the polyolefin resin compositions prepared through Examples 1 to 4 and Comparative Examples 1 to 4, specimens were produced by injection molding at a mold temperature of 70 ° C. and an injection pressure of 60 to 100 bar. The results are shown in Table 2 below.
The flexural modulus (kg / cm 2) was measured at room temperature by the method of ASTM D 790, the impact strength at room temperature (kg · cm / cm) was measured at room temperature by the method of ASTM D 256, (kg · cm / cm) was measured at -10 ° C. according to the method of ASTM D 256, and the specific gravity was measured at room temperature according to the method of ASTM D 1238. The MD shrinkage (%) was measured at room temperature (Machine Direction), and the TD shrinkage (%) was measured by Transverse Direction at room temperature in accordance with ASTM D 955.
As shown in Table 2, the polyolefin resin compositions prepared in Examples 1 to 4 have higher flexural modulus, impact strength and specific gravity than the comparative examples 1 to 4, and have a low shrinkage ratio, have.
Therefore, the polyolefin resin composition can improve the strength, impact resistance and dimensional stability when manufactured into a case through injection molding.
As described above, the present invention is not limited to the above-described embodiments, but rather may be applied to other embodiments of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
10, 20:
111, 211:
120, 220: Detection sensor 125: Cable
130:
141: signal receiving unit 142: signal converting unit
143: Communication unit 144:
145: Controller
Claims (7)
A conical device formed in a conical shape and disposed inside the powder to receive weight information of the powder;
A sensor mounted on an inner wall of the silo and connected to the cone device via a cable to sense weight information of the powder received by the cone device;
A microprocessor which is formed outside the silo and electrically connected to the detection sensor and receives weight information of the powder applied to the outer surface of the cone device sensed by the sensing sensor, The powder level measuring apparatus comprising:
Wherein the weight information of the powder is a magnitude of surface tension or pressure with respect to the outer surface of the cone device.
Wherein the detection sensor can be a weight sensor or a pressure sensor.
Wherein the detection sensor can be formed in a five-letter shape or a cylindrical shape.
The microprocessor
A signal receiving unit for receiving weight information of the powder sensed by the sensing sensor;
A signal converter for converting the weight information of the received powder into an analog signal;
A communication unit for transmitting the converted signal to the outside;
A display unit for outputting the converted signal to the outside, or converting the converted signal into a digital signal and outputting it to the outside; And
And a controller for controlling the operation of each component.
A support bar having one side fixed to an inner side wall of the silo;
A sensing sensor fixed to an upper portion of the support bar to sense the weight of the powder; And
And a microprocessor formed to be electrically connected to the detection sensor on the outside of the silo, receives the weight information of the powder sensed by the detection sensor, processes the signal, and transmits the signal to the outside. Measuring device.
Wherein the detection sensor is fixed in a direction perpendicular to the longitudinal direction of the support bar.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140078977A KR101469687B1 (en) | 2014-06-26 | 2014-06-26 | Powder level measuring system |
| PCT/KR2015/005670 WO2015199350A1 (en) | 2014-06-26 | 2015-06-05 | Apparatus for measuring level of powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140078977A KR101469687B1 (en) | 2014-06-26 | 2014-06-26 | Powder level measuring system |
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| KR101469687B1 true KR101469687B1 (en) | 2014-12-05 |
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| KR1020140078977A KR101469687B1 (en) | 2014-06-26 | 2014-06-26 | Powder level measuring system |
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| KR (1) | KR101469687B1 (en) |
| WO (1) | WO2015199350A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768596A (en) * | 2017-02-14 | 2017-05-31 | 山东省元丰节能装备科技股份有限公司 | The method of warehouse positive and negative pressure safety monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2020978B1 (en) * | 2018-05-24 | 2019-12-02 | Caesar Internet Business B V | A device for monitoring the load of material in a container |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08278185A (en) * | 1995-04-06 | 1996-10-22 | Ishikawajima Harima Heavy Ind Co Ltd | Level detector of granular material and method thereof |
| JPH09126841A (en) * | 1995-08-30 | 1997-05-16 | Satake Eng Co Ltd | Electromagnetic flow-rate measuring instrument and its flow-rate correcting method |
| KR19990032039A (en) * | 1997-10-16 | 1999-05-06 | 윤유중 | Automatic Measurement System of Storage Tank Storage Material |
| KR20100092431A (en) * | 2007-10-04 | 2010-08-20 | 비트로 글로발, 에스. 에이. | Method and apparatus for feeding a pulverized material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100807567B1 (en) * | 2001-11-20 | 2008-03-06 | 주식회사 포스코 | Mould leveling device for measuring mould powder layer and thereof measuring method |
| KR20120035754A (en) * | 2010-10-06 | 2012-04-16 | 주식회사 포스코 | Apparatus and method for measuring level of container |
-
2014
- 2014-06-26 KR KR1020140078977A patent/KR101469687B1/en active IP Right Grant
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2015
- 2015-06-05 WO PCT/KR2015/005670 patent/WO2015199350A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08278185A (en) * | 1995-04-06 | 1996-10-22 | Ishikawajima Harima Heavy Ind Co Ltd | Level detector of granular material and method thereof |
| JPH09126841A (en) * | 1995-08-30 | 1997-05-16 | Satake Eng Co Ltd | Electromagnetic flow-rate measuring instrument and its flow-rate correcting method |
| KR19990032039A (en) * | 1997-10-16 | 1999-05-06 | 윤유중 | Automatic Measurement System of Storage Tank Storage Material |
| KR20100092431A (en) * | 2007-10-04 | 2010-08-20 | 비트로 글로발, 에스. 에이. | Method and apparatus for feeding a pulverized material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768596A (en) * | 2017-02-14 | 2017-05-31 | 山东省元丰节能装备科技股份有限公司 | The method of warehouse positive and negative pressure safety monitoring |
| CN106768596B (en) * | 2017-02-14 | 2019-07-30 | 山东省元丰节能装备科技股份有限公司 | The method of warehouse positive and negative pressure safety monitoring |
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| WO2015199350A1 (en) | 2015-12-30 |
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