CN109158158B - High-pressure roller mill chute material column height detection device and method - Google Patents

High-pressure roller mill chute material column height detection device and method Download PDF

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Publication number
CN109158158B
CN109158158B CN201811206106.1A CN201811206106A CN109158158B CN 109158158 B CN109158158 B CN 109158158B CN 201811206106 A CN201811206106 A CN 201811206106A CN 109158158 B CN109158158 B CN 109158158B
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height
chute
material column
oil
pressure
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CN109158158A (en
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王志国
孙立
韩家骅
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Northern Engineering and Technology Corp MCC
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Northern Engineering and Technology Corp MCC
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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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding 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
    • G01F23/14—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 pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention relates to a high-pressure roller mill chute material column height detection device and method, which are characterized in that: the detection device consists of an oil containing box, a rubber cover, a movable joint, an oil delivery pipe, a valve, a pressure transmitter, an on-line oil supplementing and pressure regulating pipe and a bearing bracket; the invention relates to a method for detecting the height of a chute material column of a pellet high-pressure roller mill, wherein the calibration of the relation between the pressure and the height of the material column is started from zero and is carried out until the highest position of the height of the material column in the chute, and the height of the material column is generally calibrated once every one meter; after the actual calibration on site, the detection and calculation of the height of the material column firstly judges which calibration interval P is, if P x ＞P＞P x‑1 And (3) calculating the height h of the material column in the chute according to a formula (2). 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 height of other powdery solid material columns and liquid.

Description

High-pressure roller mill chute material column height detection device and method
Technical Field
The invention belongs to the technical field of solid powder material level detection, and particularly relates to a high-pressure roller mill chute material column height detection device and method.
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 a material column of a feeding chute of the high-pressure roller mill, and can continuously and stably feed the high-pressure roller mill under the action of gravity only when the material column is stable at a certain height, so that the specific surface area of the iron ore powder raw material can reach the requirements; the feed chute of the high pressure roller mill is thus vertical and has a small upper mouth and a large lower mouth, and the production process requires a high stability of the column (as shown in fig. 1). The detection of the height of the chute feeding material column cannot be met by common material level detection means (such as radar, weighing, laser, heavy hammer and ultrasonic), but only a nuclear material level gauge can be met at present, but has certain pollution and danger, and the management and maintenance requirements on the nuclear material level gauge are very high, so that post workers are unwelcome, and enterprises are difficult to handle the problem.
Therefore, the detection device and the detection method for the chute material column of the 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 column height detection device and method for a high-pressure roller mill, which are used for converting gravity of materials into oil pressure in a chute material level detection device by utilizing the gravity characteristic of the materials and carrying out on-line detection on the pressure of the oil pressure, so that the height of a chute material column can be obtained, and the problem that a nuclear source is required to be arranged in the prior art to detect the height of the material column in the chute is solved.
The invention aims at realizing the following technical scheme:
the invention relates to a high-pressure roller mill chute material column height detection device, which comprises a feeding chute of a high-pressure roller mill, a bearing platform of the feeding chute and a detection device arranged above a feeding port of the feeding chute, and is characterized in that: the detection device consists of an oil containing box, a rubber cover, a movable joint, an oil delivery pipe, a valve, a pressure transmitter, an on-line oil supplementing and pressure regulating pipe and a bearing bracket;
the bearing bracket is arranged above the feeding port of the feeding chute, two ends of the bearing bracket penetrate through the side surface of the feeding chute and are fixed on the bearing platform, the Cheng Youhe is a hollow cylinder and is fixed on the bearing bracket through bolts, the upper part of the oil containing box is sealed by adopting a rubber cover, the side part of the oil containing box is provided with an oil inlet pipe, the oil inlet pipe is connected with an oil delivery pipe through a movable joint, and the oil delivery pipe is communicated with the pressure transmitter through a valve to form a silicone oil pressure measurement and control loop; the on-line oil supplementing and pressure regulating pipe for oil filling, oil supplementing, pressure regulating and air exhausting is arranged on the oil conveying pipe.
The oil containing box is made of stainless steel.
The invention discloses a method for detecting the height of a chute material column of a high-pressure roller mill, which is characterized by comprising the following steps of: the chute material column height detection device is arranged above a feeding chute feeding port, and vertical pressure at the depth h (namely the height of a material column) below a material storage surface is calculated according to a Rankine method:
P＝γh (1)
p-vertical pressure at depth h below the storage level (i.e., column height), unit: kPa;
gamma-gravity density of bulk storage, unit: KN/m 3 ；
h, distance from the top surface of the storage material to the chute material column height detection device, wherein the unit is: m;
the calibration of the relation between the pressure and the height of the material column and the detection of the height of the material column comprise the following steps:
1) Calibration of pressure and material column height relationship
Calibrating from zero of the height of the material column until the highest position of the height of the material column in the chute, wherein the height of the material column is calibrated once every one meter;
(1) At the initial feeding time in the chute, namely the height h of the material column 0 At zero, the front-end adjustable quantitative feeding device continuously feeds according to rated production working conditions, and the measured pressure value is taken as initial pressure P 0 ；
(2) H is arranged in the chute 1 When the height of the material column is higher, the front-end adjustable quantitative feeding device still continuously feeds according to the rated production working condition, and the pressure value P is measured at the moment 1 As the corresponding h 1 The pressure generated by the height of the material column;
(3) H is arranged in the chute 2 When the height of the material column is higher, the front-end adjustable quantitative feeding device still continuously feeds according to the rated production working condition, and the pressure value P is measured at the moment 2 As the corresponding h 2 The pressure generated by the height of the material column;
(4) H is arranged at the highest position of a material column in the chute x When the height of the material column is higher, the front-end adjustable quantitative feeding device still continuously feeds according to the rated production working condition, and the pressure value P is measured at the moment x As the corresponding h x The pressure generated by the height of the material column;
2) Detection of material column height
(1) After the actual calibration on site, according to the actual measured pressure P of the pressure transmitter, firstly judging which calibration interval P is in, if P x ＞P＞P x-1 The corresponding relation between the height h of the material column in the chute and the actual measured pressure P of the pressure transmitter is as follows:
wherein: p-vertical pressure at depth h below the storage level (i.e., column height), unit: kPa;
h, distance from the top surface of the storage material to the chute material column height detection device, wherein the unit is: m;
and obtaining the height of the material column in the chute corresponding to the x calibration measurement interval according to the formula.
Compared with the prior art, the invention has the following advantages:
the chute material column height detection device of the high-pressure roller mill is free from the influence of the size of a chute and the continuous blanking of the front-end adjustable quantitative feeding device, 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, stable measurement, high measurement precision and low cost.
The invention can detect not only the height of the material column of the iron ore powder in the feeding chute of the high-pressure roller mill, but also the heights of other powdery solid materials and liquid.
Drawings
Fig. 1 is a schematic view of the structure of the detection device provided on a chute of a high-pressure roller mill.
Fig. 2 is a schematic structural diagram of a detection device according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
fig. 1 is a schematic diagram of a chute structure, and fig. 1 is a schematic diagram of a chute structure, wherein a chute material column height detecting device 1 is arranged above a bottom ore feeding port of an ore feeding chute 3 of a high-pressure roller mill 2, a stacking material 6 is arranged at the lower half part in the chute 3, and a free falling bulk material 5 input by an adjustable quantitative feeding device 4 is arranged at the upper half part of the chute 3.
When the processing amount of the high-pressure roller mill 2 is larger than the feeding amount of the front-end adjustable quantitative feeding device 4, the upper surface of the piled material 6 at the lower part in the chute 3 is reduced, and the vertical pressure acting on the chute material column height detecting device 1 is reduced; when the processing amount of the high-pressure roller mill 2 is smaller than the feeding amount of the front-end adjustable quantitative feeding device 4, the upper surface of the piled material 6 at the lower part in the chute 3 is raised, and the vertical pressure acting on the chute material column height detecting device 1 is increased; the vertical pressure acting on the chute material column height detection device 1 is measured to calculate the height of the upper surface of the piled material 6 in the chute, namely the height of the chute material column is detected.
The invention relates to a high-pressure roller mill chute material column height detection device, which comprises a feeding chute 3 of a high-pressure roller mill 2, a bearing platform 7 of the feeding chute and a detection device 1 arranged above a feeding port of the feeding chute 3, and is characterized in that: the detection device consists of an oil box 1-1, a rubber cover 1-2, a movable joint 1-3, an oil delivery pipe 1-4, a valve 1-5, a pressure transmitter 1-6, an online oil supplementing and pressure regulating pipe 1-7 and a bearing bracket 1-8;
the bearing bracket 1-8 is arranged above the feeding port of the feeding chute, two ends of the bearing bracket penetrate through the side face of the feeding chute 3 and are fixed on the bearing platform 7, the oil containing box 1-1 is a hollow cylinder made of stainless steel and is fixed on the bearing bracket 1-8 through bolts, the upper part of the oil containing box 1-1 is sealed by adopting a rubber cover 1-2, an oil inlet pipe is arranged on the side part of the oil containing box 1-1 and is connected with an oil conveying pipe 1-4 through a movable joint 1-3, and the oil conveying pipe is communicated with the pressure transmitter 1-6 through a valve 1-5 to form a silicone oil pressure measurement and control loop; the on-line oil supplementing and pressure regulating pipe 1-7 for oil filling, oil supplementing, pressure regulating and air exhausting is arranged on the oil conveying pipe 1-4.
The invention discloses a method for detecting the height of a chute material column of a high-pressure roller mill, which is characterized by comprising the following steps of: the chute material column height detection device is arranged above a feeding hole of the feeding chute 3, and vertical pressure at the depth h (namely the height of a material column) below a material storage surface is calculated according to a Rankine method:
P＝γh (1)
p-vertical pressure at depth h below the storage level (i.e., column height), unit: kPa;
gamma-gravity density of bulk storage, unit: KN/m 3 ；
h, distance from the top surface of the storage material to the chute material column height detection device, wherein the unit is: m;
the calibration of the relation between the pressure and the height of the material column and the detection of the height of the material column comprise the following steps:
1) Calibration of pressure and material column height relationship
Calibrating from zero of the height of the material column until the highest position of the height of the material column in the chute, wherein the height of the material column is calibrated once every one meter;
(1) At the initial feeding time in the chute, namely the height h of the material column 0 At zero, the front-end adjustable quantitative feeding device 4 continuously feeds according to the rated production working condition, and the measured pressure value is taken as the initial pressure P 0 ；
(2) H is arranged in the chute 1 When the height of the material column is high, the front-end adjustable quantitative feeding device 4 still continuously feeds according to the rated production working condition, and the pressure value P is measured at the moment 1 As the corresponding h 1 The pressure generated by the height of the material column;
(3) H is arranged in the chute 2 When the height of the material column is high, the front-end adjustable quantitative feeding device 4 still continuously feeds according to the rated production working condition, and the pressure value P is measured at the moment 2 As the corresponding h 2 The pressure generated by the height of the material column;
(4) H is arranged at the highest position of a material column in the chute x When the height of the material column is high, the front-end adjustable quantitative feeding device 4 still continuously feeds according to the rated production working condition, and the pressure value P is measured at the moment x As the corresponding h x Material columnHighly generated pressure;
2) Detection of material column height
(1) After the actual calibration on site, according to the actual measured pressure P of the pressure transmitter 1-6, firstly judging which calibration interval P is in, if P x ＞P＞P x-1 The corresponding relation between the height h of the material column in the chute and the actual measured pressure P of the pressure transmitter 1-6 is as follows:
wherein: p-vertical pressure at depth h below the storage level (i.e., column height), unit: kPa;
h, distance from the top surface of the storage material to the chute material column height detection device, wherein the unit is: m;
and obtaining the height of the material column in the chute corresponding to the x calibration measurement interval according to the formula.
Examples
Fig. 1 is a schematic structural diagram of the material level detecting device of the present invention mounted on a chute of a high-pressure roller mill, wherein a chute material column height detecting device 1 is mounted at the bottom in a chute 3 above the high-pressure roller mill 2, a stacking material 6 is arranged at the lower half part in the chute 3, and falling bulk material 5 fed by an adjustable quantitative feeding device 4 is arranged at the upper half part.
When the feeding amount of the high-pressure roller mill 2 is larger than that of the front-end adjustable quantitative feeding device 4, the upper surface of the lower half stacking material 6 in the chute 3 is lowered, and the vertical pressure acting on the chute material column height detecting device 1 is reduced; when the feeding amount of the high-pressure roller mill 2 is smaller than that of the front-end adjustable quantitative feeding device 4, the upper surface of the lower half stacking material 6 in the chute 3 is raised, and the vertical pressure acting on the chute material column height detecting device 1 is increased; therefore, the height of the upper surface of the accumulation material 6 in the chute 3, i.e., the height of the chute column, can be calculated by measuring the vertical pressure acting on the chute column height detecting device 1.
Taking the highest height of the measured material column in the chute as 4m as an example, a calibration interval is set every 1m (according to the precision requirementMore or fewer calibration intervals can be set), relevant data are obtained through on-site actual calibration, and the calibration height h is 0 、h 1 、h 2 、h 3 、h 4 The method comprises the following steps of: 0. 1, 2, 3, 4m high, corresponding pressure: p (P) 0 、P 1 、P 2 、P 3 、P 4 The method comprises the following steps of: the corresponding relation between the height h of a material column in a chute and the actual measured pressure P of the pressure transmitter 1-6 is 0.48, 21.86, 42.70, 62.75 and 81.69 kPa:
firstly, judging: p (P) x ＞P＞P x-1
The calculation data of which interval can be called can be determined, and the height of the upper surface of the lower half of the accumulation material 6 in the chute 3 can be obtained through the formula (2) and the interval calibration data.
If P 1 ＞P＞P 0 The method comprises the following steps: 21.86 > P > 0.48, is: the first calibration measurement interval is used for calculating the height h of a material column in the chute as follows:
h＝0.046773(P-0.48)
if P 2 ＞P＞P 1 The method comprises the following steps: 42.70 > P > 21.56, is: the second calibration measurement interval is used for calculating the height h of the material column in the chute as follows:
h＝0.047985(P-21.86)+1
if P 3 ＞P＞P 2 The method comprises the following steps: 62.75 > P > 42.7, is: the third calibration measurement interval is that the height h of the material column in the chute is calculated as follows:
h＝0.049875(P-42.7)+2
if P 4 ＞P＞P 3 The method comprises the following steps: 81.69 > P > 62.75, is: and a fourth calibration measurement interval, calculating the height h of a material column in the chute as follows:
h＝0.052798(P-42.7)+3
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.

Claims (2)

1. The utility model provides a high pressure roller mill chute material post height detection device, includes the feeding chute of high pressure roller mill, the bearing platform of feeding chute and sets up the detection device in feeding chute feed inlet top, its characterized in that: the detection device consists of an oil containing box, a rubber cover, a movable joint, an oil delivery pipe, a valve, a pressure transmitter, an on-line oil supplementing and pressure regulating pipe and a bearing bracket;
the bearing bracket is arranged above the feeding port of the feeding chute, two ends of the bearing bracket penetrate through the side surface of the feeding chute and are fixed on the bearing platform, the Cheng Youhe is a hollow cylinder and is fixed on the bearing bracket through bolts, the upper part of the oil containing box is sealed by adopting a rubber cover, the side part of the oil containing box is provided with an oil inlet pipe, the oil inlet pipe is connected with an oil delivery pipe through a movable joint, and the oil delivery pipe is communicated with the pressure transmitter through a valve to form a silicone oil pressure measurement and control loop; the on-line oil supplementing and pressure regulating pipe for oil filling, oil supplementing, pressure regulating and air exhausting is arranged on the oil conveying pipe.
2. The high-pressure roller mill chute material column height detection device according to claim 1, wherein the oil containing box is made of stainless steel.
CN201811206106.1A 2018-10-17 2018-10-17 High-pressure roller mill chute material column height detection device and method Active CN109158158B (en)

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JP2020159839A (en) * 2019-03-26 2020-10-01 株式会社カワタ Granular body processing method and granular body processing device
CN111437983B (en) * 2020-02-13 2021-03-16 中南大学 Method for efficiently activating pellet iron concentrate through high-pressure roller milling

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CN201835821U (en) * 2010-10-08 2011-05-18 大庆北研石油设备制造有限公司 Wired detector for height of downhole fluid column for oil production
CN103924995A (en) * 2014-03-19 2014-07-16 北京天地玛珂电液控制系统有限公司 Automatic tamping control system for filling stents
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