CN109225590B - Device and method for detecting chute material level of pellet high-pressure roller mill - Google Patents
Device and method for detecting chute material level of pellet high-pressure roller mill Download PDFInfo
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- CN109225590B CN109225590B CN201811206074.5A CN201811206074A CN109225590B CN 109225590 B CN109225590 B CN 109225590B CN 201811206074 A CN201811206074 A CN 201811206074A CN 109225590 B CN109225590 B CN 109225590B
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- chute
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention relates to a device and a method for detecting the chute material level of a pellet high-pressure roller mill, which comprises the high-pressure roller mill, a tray type quantitative feeder, a chute material level detection mechanism and a chute material level monitoring system, and is characterized in that: the chute material level detection mechanism consists of a liquid storage bag side plate, wear-resistant cloth, a liquid storage bag, a fixing frame, a connecting pipe, an opening and closing valve, a measuring cylinder and a guided wave radar level gauge; according to the method for detecting the material level of the chute of the pellet high-pressure roller mill, disclosed by the invention, the feeding amount of the tray type quantitative feeder can be automatically adjusted according to the detected and calculated material level height value so as to be stabilized at a set value. The invention has the advantages that: 1. the height of the chute material column can be measured by replacing a nuclear level gauge; 2. the structure is simple, the cost is low, the measurement is stable, and the measurement precision is high; 3. can be used for detecting the heights of other powdery solid material columns.
Description
Technical Field
The invention belongs to the technical field of solid powder material level detection, and particularly relates to a chute material level detection device and method of a pellet high-pressure roller mill.
Background
The importance of pellets in the pre-iron field of the steel industry is self-evident. One key element of pellet is a pelletizing process, which affects the production efficiency of the whole line, and one important index of the pelletizing process is the pelletizing rate. The balling rate is affected by a plurality of factors, wherein one of the important factors directly related to the iron ore powder raw material is the specific surface area of the material, and the balling rate of the balling process is seriously affected by the fact that the specific surface area of the material is not in accordance with the requirements, so that the particle size of the iron ore powder raw material is determined. Because the iron ore powder raw materials produced by most mineral separation processes cannot meet the requirements, in order to improve the balling rate of a balling production line, a high-pressure roller grinding process is arranged in a balling factory to change the specific surface area of the iron ore powder raw materials. In order to ensure the height of a material column in a feeding chute of the high-pressure roller mill, an adjustable quantitative feeding device is generally arranged at the front end, and bulk materials falling down from the adjustable quantitative feeding device form a stacked material, namely a material column; the high-pressure roller mill has certain requirements on the height of the material column of the feeding chute, namely, the high-pressure roller mill requires the material column of the feeding chute to keep a certain height (generally about 3 m), and the feeding of the roll gap of the high-pressure roller mill is finished by the gravity of the material column; in order to ensure that the gravity of the material column can stably act on the roll gap, the feeding chute is required to be vertical, the upper opening is small, the lower opening is large, the height of the material column is kept stable in the production process, and the material column can continuously and stably feed the roll gap of the high-pressure roller mill under the action of the gravity, so that the specific surface area of the iron ore powder raw material can meet the requirement. Therefore, the height detection of the feeding column brings certain difficulty, the conventional solid material level detection equipment (laser, radar, ultrasonic, heavy hammer and the like) cannot be used because of continuous feeding at the upper part and small caliber, and the weighing material level indicator cannot be used because of the gravity requirement of the equipment on the roll gap, so that the requirement can be met only by adopting the nuclear material level indicator at present, but the nuclear material level indicator has certain pollution and danger, and the management and maintenance requirements on the nuclear material level indicator are very high, so that the station workers are unwelcome, and enterprises are difficult to handle the problem.
Therefore, the device and the method for detecting the height of the chute material column of the pellet high-pressure roller mill, which have simple structure, low cost and no nuclear pollution, are very important and have practical significance.
Disclosure of Invention
The invention aims to provide a chute material level detection device and method for a pellet high-pressure roller mill, which can be used for converting the material level in a closed complex environment into the material level which is good in environment and stable in measured medium and can be measured by adopting a common material level meter, so as to solve the problem that a nuclear source is required to be arranged in the prior art to detect the chute material level.
The invention aims at realizing the following technical scheme:
the invention relates to a chute material level detection device of a pellet high-pressure roller mill, which comprises a high-pressure roller mill, a tray type quantitative feeder, a chute material level detection mechanism and a chute material level monitoring system, and is characterized in that: the chute material level detection mechanism consists of a liquid storage bag side plate, wear-resistant cloth, a liquid storage bag, a fixing frame, a connecting pipe, an opening and closing valve, a measuring cylinder and a guided wave radar level gauge; the liquid storage bag side plate is fixedly connected to the inner side wall of the chute through the fixing frame, the cross section of the liquid storage bag is semi-cylindrical, the plane part of the liquid storage bag is attached to the liquid storage bag side plate, the cylindrical surface part of the liquid storage bag is wrapped by wear-resistant cloth, the wear-resistant cloth is fixedly connected to the liquid storage bag side plate, the lower end of the liquid storage bag is closed and positioned at the lower part of the chute, the upper end of the liquid storage bag is communicated with the connecting pipe, the other end of the connecting pipe passes through the side wall of the chute and is communicated with the bottom of the measuring cylinder, the connecting pipe is provided with an opening and closing valve, and the top of the measuring cylinder is provided with an air vent; the guided wave radar liquid level meter is used for detecting the liquid level change value of the measuring cylinder, the signal output end of the guided wave radar liquid level meter is electrically connected with the chute material level monitoring system, and the signal output end of the monitoring system is electrically connected with the bracket type quantitative feeder.
The liquid storage bag is made of rubber or PVC materials.
The invention discloses a method for detecting the chute material level of a pellet high-pressure roller mill, which is characterized by comprising the following steps of: comprises the following steps:
1) The chute material level detection mechanism is arranged on the inner side wall of a feeding chute of the high-pressure roller mill, when the feeding amount of the supporting type quantitative feeder is larger than the processing amount of the high-pressure roller mill, a material column can rise, the wear-resistant cloth and the liquid storage bag are extruded under the action of the side pressure of the material, so that the liquid in the liquid storage bag rises, and the liquid level in the measuring cylinder rises; when the feeding amount of the supporting type quantitative feeder is smaller than the processing amount of the high-pressure roller mill, the material column is lowered, at the moment, liquid in the measuring cylinder enters the liquid storage bag under the action of dead weight, the liquid level in the measuring cylinder is lowered, and the detected liquid level change value of the measuring cylinder is sent to the chute material level monitoring system by the guided wave radar liquid level meter;
2) After the chute material level monitoring system receives the signal output of the guided wave radar liquid level gauge, according to the principle that the volume of the iron ore powder cylinder in the chute and the volume of liquid in the liquid storage bag are equal volume displacement, the following formula is deduced, and the obtained chute material level height h is:
h＝h0+2*ΔH*R 2 /r 2
wherein:
h 0 the height of the bottom of the liquid storage bag from the bottom of the chute is mm;
Δh is the change in height of the liquid in the measuring cylinder, mm;
r is the radius of the liquid storage bag, and mm;
r is the radius of the measuring cylinder, and mm;
3) The chute material level monitoring system calculates the chute material level height h according to the formula, and automatically adjusts the feeding amount of the tray type quantitative feeder by comparing the difference between the chute material level height h and the chute material level height set value.
Compared with the prior art, the invention has the following advantages:
1. the high-pressure roller mill chute material level device is not influenced by continuous bulk materials given by a supported quantitative feeder, does not influence the dead weight of materials in a chute, has no pollution, avoids the condition that a nuclear source is required to be arranged in the prior art to measure the chute material level, and has the advantages of simple structure, convenience in maintenance and cost saving.
2. The chute material level detection device changes corresponding equal volume liquid in the liquid storage bag by utilizing the dead weight and side pressure (stacking angle) of the stacking material in the chute, so that the corresponding liquid level of the measuring cylinder also changes, the height of a material column in the chute is identified by measuring the liquid level in the measuring cylinder based on the guided wave radar liquid level meter, and under the condition that conventional material level meters such as laser, radar, ultrasound, heavy hammer, weighing and the like can not detect, the chute material level detection sampling device and the guided wave radar liquid level meter can realize, and the chute material level detection device has no requirements on conductivity, dielectric constant and the like of the measured material, and has stable measurement and high measurement precision.
3. The invention can detect the height of the material column of the iron ore powder in the feeding chute of the high-pressure roller mill and detect the heights of other powdery or small granular solid materials.
Drawings
FIG. 1 is a schematic view of the structure of the present invention disposed on a feed chute in a high pressure roll abrasive flow process.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic structural diagram of a chute material level detecting device.
Fig. 4 is a B-B view of fig. 3.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, 2, 3 and 4, the chute material level detection device of the pellet high-pressure roller mill comprises a high-pressure roller mill 1, a tray type quantitative feeder 3, a chute 2, a chute material level detection mechanism 4 and a chute material level monitoring system; the method is characterized in that: the chute material level detection mechanism 4 consists of a liquid storage bag side plate 4-1, wear-resistant cloth 4-2, a liquid storage bag 4-3, a fixing frame 4-4, a connecting pipe 4-5, an opening and closing valve 4-6, a measuring cylinder 4-7 and a guided wave radar level gauge 4-8; the liquid storage bag side plate 4-1 is fixedly connected to the inner side wall of the chute 2 through the fixing frame 4-4, the liquid storage bag 4-3 is made of rubber or PVC material, the cross section of the liquid storage bag 4-3 is semi-cylindrical, the plane part of the liquid storage bag 4-3 is attached to the liquid storage bag side plate 4-1, the cylindrical surface part of the liquid storage bag 4-3 is wrapped by the wear-resistant cloth 4-2, the wear-resistant cloth is fixedly connected to the liquid storage bag side plate 4-1, the lower end of the liquid storage bag 4-3 is sealed and positioned at the lower part of the chute 2, the upper end of the liquid storage bag 4-3 is communicated with the connecting pipe 4-5, the other end of the connecting pipe 4-5 passes through the side wall of the chute 2 and is communicated with the bottom of the measuring cylinder 4-7, the opening and closing valve 4-6 is arranged on the connecting pipe 4-5, and the air exchanging hole 4-9 is arranged at the top of the measuring cylinder 4-7; the air pressure in the measuring cylinder 4-7 is always consistent with the atmospheric pressure; the guided wave radar liquid level meter 4-8 is used for detecting the liquid level change value of the measuring cylinder 4-7, the signal output end of the guided wave radar liquid level meter 4-8 is electrically connected with the chute material level monitoring system, and the signal output end of the monitoring system is electrically connected with the bracket type quantitative feeder 3.
The invention discloses a method for detecting the chute material level of a pellet high-pressure roller mill, which is characterized by comprising the following steps of: comprises the following steps:
1) The chute material level detection mechanism 4 is arranged on the inner side wall of the feeding chute 2 of the high-pressure roller mill, when the feeding amount of the tray type quantitative feeder 3 is larger than the processing amount of the high-pressure roller mill 1, the material column 5 is lifted, the wear-resistant cloth 4-2 and the liquid storage bag 4-3 are extruded under the action of the side pressure of the material, so that the liquid in the liquid storage bag 4-3 is lifted, and the liquid level in the measuring cylinder 4-7 is lifted; when the feeding amount of the tray type quantitative feeder 3 is smaller than the processing amount of the high-pressure roller mill 1, the material column 5 is lowered, at the moment, liquid in the measuring cylinder 4-7 enters the liquid storage bag 4-3 under the action of dead weight, the liquid level in the measuring cylinder 4-7 is lowered, and the guided wave radar liquid level meter 4-8 sends the detected liquid level change value of the measuring cylinder 4-7 to the chute material level monitoring system;
2) After the chute material level monitoring system receives the signal output of the guided wave radar liquid level gauge 4-7, the following formula is deduced according to the principle that the volume of the iron ore powder column in the chute and the volume of the liquid in the liquid storage bag 4-3 are equal volume displacement, and the obtained chute material level height h is:
h＝h0+2*ΔH*R 2 /r 2
wherein:
h 0 the height of the bottom of the liquid storage bag 4-3 from the bottom of the chute is mm;
ΔH is the height change of the liquid in the measuring cylinder 4-7, and mm;
r is the radius of the liquid storage bag 4-3, mm;
r is the radius of the measuring cylinder 4-7, mm;
3) The chute material level monitoring system calculates the chute material level height h according to the formula, and automatically adjusts the feeding amount of the supporting type quantitative feeder 3 by comparing the difference between the chute material level height h and the chute material level height set value, and the cycle is repeated.
Examples
As shown in fig. 1, the upper end of a feeding chute 2 of the high-pressure roller mill is provided with bulk materials fed by a supporting type quantitative feeder 3, the lower end of the feeding chute is provided with a material column (stacking material) formed by continuous bulk material falling, the bulk materials are free falling bodies, only have dead weight and do not have lateral pressure, but the material column (stacking material) has dead weight, and the gravity superposition of upper materials and the generation of lateral pressure (stacking angle) are also carried out. When the feeding amount of the tray type quantitative feeder 3 is larger than the feeding amount of the high-pressure roller mill 1, the material column 5 is raised, the material extrudes the wear-resistant cloth 4-2 and the liquid storage bag 4-3 under the action of gravity and lateral pressure (stacking angle), and the liquid storage bag side plate 4-1 is fixed, so that the liquid in the liquid storage bag 4-3 is forced to rise, and enters the measuring cylinder 4-7 through the connecting pipe 4-5, so that the liquid level in the measuring cylinder 4-7 is raised; when the feeding amount of the supporting type quantitative feeder 3 is smaller than the feeding amount of the high-pressure roller mill 1, the material column 5 is lowered, the liquid storage bag 4-3 and the wear-resistant cloth 4-2 are extruded under the action of the dead weight and the fluidity of liquid, the side plate 4-1 of the liquid storage bag is fixed, the liquid storage bag 4-3 in the descending area of the material column 5 is forced to be filled with liquid, the liquid in the measuring cylinder 4-7 enters the liquid storage bag 4-3 through the connecting pipe 4-5, and the liquid level in the measuring cylinder 4-7 is lowered; so that the liquid level in the measuring cylinder 4-7 can be obtained to be changed along with the change of the height of the material column in the high-pressure grinding chute 2. The liquid level of the measuring cylinder 4-7 is measured by adopting a conventional guided wave radar liquid level meter 4-8, the guided wave radar liquid level meter 4-8 is fixed on the measuring cylinder 4-7 through a flange, and the guided wave radar liquid level meter 4-8 outputs a two-wire system 4-20 mA standard signal.
In the embodiment, the radius of the liquid storage bag 4-3 of the chute material level detection sampling device is 100mm, the radius of the measuring cylinder 4-7 is 250mm, the liquid level height change of the measuring cylinder is represented by delta H, the height of the bottom of the liquid storage bag 4-3 of the chute material level detection sampling device from the bottom opening of the chute of the high-pressure roller mill is 500mm, the height of a material column in the chute of the high-pressure roller mill is incompressible by using H as two conversion mediums, so that the volume change is equal, and the height H of the material column in the chute of the high-pressure roller mill can be calculated to be:
h＝500+2*ΔH*250 2 /100 2
＝500+12.5ΔH
the delta H in the formula is the liquid level change of the measuring cylinder 4-7, and the mature guided wave radar liquid level meter is used for actually measuring the liquid level change delta H of the measuring cylinder 4-7, so that real-time data of the height H of a material column in the high-pressure grinding chute can be obtained.
The invention changes the corresponding equal volume liquid level change in the liquid bag by utilizing the dead weight and side pressure (stacking angle) of the stacking material in the chute, so that the liquid level of the corresponding measuring cylinder 4-7 also changes, the height of the material column in the chute is identified by measuring the liquid level in the measuring cylinder based on the guided wave radar liquid level meter, and under the condition that the conventional material level meter such as laser, radar, ultrasonic, heavy hammer, weighing and the like can not detect, the material level detection sampling device and the guided wave radar liquid level meter 4-8 can realize, and the device has no requirements on the conductivity, dielectric constant and the like of the measured material, especially the feeding chute of a high-pressure roller mill.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The invention can measure iron ore powder and can also be applied to other materials, as long as the density of the measured medium is ensured to be greater than that of liquid in the liquid bag of the chute material level detection sampling device, and the material column can squeeze the liquid in the corresponding liquid bag into the measuring cylinder when the lowest point of the measuring area is reached.
Claims (2)
1. A method for detecting the material level of a chute of a pellet high-pressure roller mill is characterized by comprising the following steps of: comprises the following steps:
1) Install pellet high pressure roller mill chute material level detection device on high pressure roller mill feed chute inside wall, pellet high pressure roller mill chute material level detection device, including high pressure roller mill, support formula constant feeder, chute material level detection mechanism and chute material level monitored control system, its characterized in that: the chute material level detection mechanism consists of a liquid storage bag side plate, wear-resistant cloth, a liquid storage bag, a fixing frame, a connecting pipe, an opening and closing valve, a measuring cylinder and a guided wave radar level gauge; the liquid storage bag side plate is fixedly connected to the inner side wall of the chute through the fixing frame, the cross section of the liquid storage bag is semi-cylindrical, the plane part of the liquid storage bag is attached to the liquid storage bag side plate, the cylindrical surface part of the liquid storage bag is wrapped by wear-resistant cloth, the wear-resistant cloth is fixedly connected to the liquid storage bag side plate, the lower end of the liquid storage bag is closed and positioned at the lower part of the chute, the upper end of the liquid storage bag is communicated with the connecting pipe, the other end of the connecting pipe passes through the side wall of the chute and is communicated with the bottom of the measuring cylinder, the connecting pipe is provided with an opening and closing valve, and the top of the measuring cylinder is provided with an air vent; the signal output end of the guided wave radar liquid level meter is electrically connected with the chute material level monitoring system, and the signal output end of the monitoring system is electrically connected with the bracket type quantitative feeder;
when the feeding amount of the supporting type quantitative feeder is larger than the processing amount of the high-pressure roller mill, the material column is raised, the wear-resistant cloth and the liquid storage bag are extruded under the action of the lateral pressure of the material, so that the liquid in the liquid storage bag is raised, and the liquid level in the measuring cylinder is raised; when the feeding amount of the supporting type quantitative feeder is smaller than the processing amount of the high-pressure roller mill, the material column is lowered, at the moment, liquid in the measuring cylinder enters the liquid storage bag under the action of dead weight, the liquid level in the measuring cylinder is lowered, and the detected liquid level change value of the measuring cylinder is sent to the chute material level monitoring system by the guided wave radar liquid level meter;
2) After the chute material level monitoring system receives the signal output of the guided wave radar liquid level gauge, according to the principle that the volume of the iron ore powder cylinder in the chute and the volume of liquid in the liquid storage bag are equal volume displacement, the following formula is deduced, and the obtained chute material level height h is:
；
wherein:
h 0 the height of the bottom of the liquid storage bag from the bottom of the chute is mm;
Δh is the change in height of the liquid in the measuring cylinder, mm;
r is the radius of the liquid storage bag, and mm;
r is the radius of the measuring cylinder, and mm;
3) The chute material level monitoring system calculates the chute material level height h according to the formula, and automatically adjusts the feeding amount of the tray type quantitative feeder by comparing the difference between the chute material level height h and the chute material level height set value.
2. The method for detecting the chute material level of the pellet high-pressure roller mill according to claim 1, wherein the liquid storage bag is made of rubber or PVC material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811206074.5A CN109225590B (en) | 2018-10-17 | 2018-10-17 | Device and method for detecting chute material level of pellet high-pressure roller mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811206074.5A CN109225590B (en) | 2018-10-17 | 2018-10-17 | Device and method for detecting chute material level of pellet high-pressure roller mill |
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| CN109225590A CN109225590A (en) | 2019-01-18 |
| CN109225590B true CN109225590B (en) | 2023-10-20 |
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| JPS58197207A (en) * | 1982-05-14 | 1983-11-16 | Kawasaki Steel Corp | Detection of channeling of charge in vertical chute part of charger for blast furnace |
| CN1331617A (en) * | 1998-12-23 | 2002-01-16 | Sms德马格股份公司 | Method for detecting and controlling level of liquid metal in ingot mold |
| CN202028455U (en) * | 2011-02-24 | 2011-11-09 | 中冶北方工程技术有限公司 | Impurity removing equipment for high-pressure roller mill |
| CN203764316U (en) * | 2014-01-10 | 2014-08-13 | 中信重工机械股份有限公司 | Radar material level detection device of high-pressure roller mill |
| CN204101124U (en) * | 2014-09-29 | 2015-01-14 | 万达集团股份有限公司 | The continuous coverage of a kind of novel solid level of filler material becomes send output unit |
| CN208990975U (en) * | 2018-10-17 | 2019-06-18 | 中冶北方（大连）工程技术有限公司 | A kind of pelletizing high-pressure roller mill chute material-level detecting device |
-
2018
- 2018-10-17 CN CN201811206074.5A patent/CN109225590B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58197207A (en) * | 1982-05-14 | 1983-11-16 | Kawasaki Steel Corp | Detection of channeling of charge in vertical chute part of charger for blast furnace |
| CN1331617A (en) * | 1998-12-23 | 2002-01-16 | Sms德马格股份公司 | Method for detecting and controlling level of liquid metal in ingot mold |
| CN202028455U (en) * | 2011-02-24 | 2011-11-09 | 中冶北方工程技术有限公司 | Impurity removing equipment for high-pressure roller mill |
| CN203764316U (en) * | 2014-01-10 | 2014-08-13 | 中信重工机械股份有限公司 | Radar material level detection device of high-pressure roller mill |
| CN204101124U (en) * | 2014-09-29 | 2015-01-14 | 万达集团股份有限公司 | The continuous coverage of a kind of novel solid level of filler material becomes send output unit |
| CN208990975U (en) * | 2018-10-17 | 2019-06-18 | 中冶北方（大连）工程技术有限公司 | A kind of pelletizing high-pressure roller mill chute material-level detecting device |
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