CN112708711A - Positioning method and system for chute of blast furnace distributing device - Google Patents
Positioning method and system for chute of blast furnace distributing device Download PDFInfo
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- CN112708711A CN112708711A CN201911020225.2A CN201911020225A CN112708711A CN 112708711 A CN112708711 A CN 112708711A CN 201911020225 A CN201911020225 A CN 201911020225A CN 112708711 A CN112708711 A CN 112708711A
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- chute
- distributing device
- rotation angle
- rotation
- angle encoder
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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- Manufacturing & Machinery (AREA)
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- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The application discloses a method and a system for positioning a chute of a blast furnace distributor, wherein the method comprises the following steps: judging whether a rotation angle encoder runs abnormally, wherein the rotation angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device; if the rotation angle encoder runs abnormally, starting a timing function, and recording the rotation time of the chute of the distributing device in real time; dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5; and judging the section of the remainder variable, and positioning the rotation angle of the chute of the distributing device. In this application, at first judge whether rotation angle encoder's operation is normal, if rotation angle encoder operation is unusual, then change the mode for realizing the rotation angle location by control program immediately, make the distributing device chute continue accurate cloth, guarantee production goes on smoothly, has improved the reliability and the stability of distributing device chute.
Description
Technical Field
The application relates to the technical field of blast furnace distribution, in particular to a positioning method and a positioning system for a chute of a blast furnace distributor.
Background
For a blast furnace for iron making, the furnace top charging equipment is used for charging and charging the furnace, reasonably distributing furnace materials in the furnace and simultaneously playing a role in sealing the furnace top. The distributing device is an important component of the blast furnace top charging equipment and realizes the distribution in the throat of the blast furnace through a chute. The chute can rotate in the circumferential direction on the horizontal plane, and uniformly distributes the furnace burden in the throat of the blast furnace in an annular motion.
At present, when a chute of a distributing device performs rotary motion in the circumferential direction on a horizontal plane, the rotation angle of the chute of the distributing device needs to be monitored in real time, and the positioning detection of the rotation angle is the basis for guiding an operator to formulate a distributing list. The distributor chute is controlled by a special driving motor to rotate, an encoder is arranged on a linkage shaft of the driving motor, and the rotation angle of the distributor chute is positioned in real time through the encoder.
In the rotating angle positioning method of the chute of the distributing device, the high-temperature environment is adopted on the site of the blast furnace, the concentration of dust and harmful gas is high, and the falling objects are damaged and the lubricating oil is polluted, so that the encoder is positioned in the severe environment on the site. Work in this kind of environment for a long time, have very big influence to encoder's performance and life for the stability and the reliability of rotation angle location reduce, and rotation angle location is inaccurate, and then reduces the cloth precision of distributing device chute.
Disclosure of Invention
The application provides a positioning method and a positioning system for a chute of a blast furnace distributor, which aim to solve the technical problem that the distribution precision of the chute of the distributor is reduced due to inaccurate positioning of a rotation angle of the chute of the distributor in the prior art.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
in a first aspect, the embodiment of the application discloses a positioning method for a chute of a blast furnace distributor, which comprises the following steps:
judging whether a rotation angle encoder runs abnormally, wherein the rotation angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device;
if the rotation angle encoder runs abnormally, starting a timing function, and recording the rotation time of the chute of the distributing device in real time;
dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5;
and judging the section to which the remainder variable belongs, and positioning the rotation angle of the chute of the distributing device.
Optionally, in the positioning method of a blast furnace distributor chute, the method further comprises:
collecting binary codes generated by two tilting angle encoders, wherein the two tilting angle encoders are respectively arranged at two ends of a linkage shaft of a chute tilting motor of the distributing device;
and (3) selecting a binary code of one tilting angle encoder, and processing to obtain the tilting angle of the chute of the distributing device, wherein if the binary code data of the current tilting angle encoder is abnormal, the binary code of the other tilting angle encoder is switched.
Optionally, in the above method for positioning a chute of a blast furnace distributor, the determining whether the rotation angle encoder operates abnormally includes:
the PLC judges whether the binary code generated by the rotation angle encoder is acquired or not, or whether the binary code generated by the rotation angle encoder is normal or not;
if the binary code of the rotation angle encoder cannot be acquired or if the binary code of the rotation angle encoder is abnormal, the rotation angle encoder operates abnormally.
Optionally, in the above method for positioning a chute of a blast furnace distributor, the rotating electrical machine is provided with a limit switch, the limit switch is electrically connected to the timer, and the obtaining of the rotation period of the chute of the distributor includes:
when an iron sheet on a linkage shaft of the rotating motor passes through the limit switch, starting the timer;
and stopping the timer when the iron sheet passes through the limit switch again.
Optionally, in the above method for positioning a chute of a blast furnace distributor, the interval T0-T5 corresponds to 0 ° -60 °, 60 ° -120 °, 120 ° -180 °, 180 ° -240 °, 240 ° -300 °, and 300 ° -360 ° in sequence, and the determining the interval to which the remainder variable belongs and positioning the rotation angle of the chute of the distributor includes:
when the remainder variable is positioned in the interval T0, the chute of the distributing device is positioned between 0 and 60 degrees;
when the remainder variable is positioned in the interval T1, the chute of the distributing device passes through 60-120 degrees;
when the remainder variable is positioned in the interval T2, the chute of the distributing device passes through 120-180 degrees;
when the remainder variable is positioned in the interval T3, the chute of the distributing device passes through 180-240 degrees;
when the remainder variable is positioned in the interval T4, the chute of the distributing device passes through 240-300 degrees;
when the remainder variable is in the interval T5, the distributor chute passes through 300-360 degrees.
In a second aspect, the embodiment of the present application discloses a positioning system for a chute of a blast furnace distributor, the system comprising:
the judging module is used for judging whether the running of a rotary angle encoder is abnormal or not, wherein the rotary angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device;
the timing module is used for starting a timing function and recording the rotation time of the chute of the distributing device in real time if the rotation angle encoder runs abnormally;
the computing module is used for dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5;
and the comparison module is used for judging the section to which the remainder variable belongs and positioning the rotation angle of the chute of the distributing device.
Optionally, in the positioning system for a chute of a blast furnace distributor, the system further includes:
the rotation angle encoder is in communication connection with a PLC controller and is used for generating a binary code and transmitting the binary code to the PLC controller.
Optionally, in the positioning system for a chute of a blast furnace distributor, the system further includes: a period acquisition module, the period acquisition module comprising: the limit switch is arranged on the rotating motor and is electrically connected with the timer;
the period acquisition module further includes:
the starting unit is used for starting the timer when an iron sheet on a linkage shaft of the rotating motor passes through the limit switch;
and the stopping unit is used for stopping the timer when the iron sheet passes through the limit switch again.
Optionally, in the positioning system for a chute of a blast furnace distributor, the system further includes: and two tilting angle encoders are arranged at two ends of a linkage shaft of the chute tilting motor of the distributing device and are in communication connection with the PLC.
Compared with the prior art, the beneficial effect of this application is:
the application provides a positioning method and a positioning system for a chute of a blast furnace distributor. When the rotary encoder operates abnormally, a timing function is started immediately, the rotation time of the chute of the distributing device is recorded in real time, and the rotation time recorded in real time is divided by the rotation period of the chute of the distributing device to obtain a remainder variable. Wherein, the rotation period is the time taken by the distributor chute to rotate for one circle, and the rotation period is divided into six equal parts, which are marked as T0-T5 intervals, that is, the T0-T5 intervals divide the circumferential angle of the distributor chute rotating for one circle into six parts, and each part corresponds to 60 degrees. And judging which interval of the interval T0-T5 the remainder variable is positioned in, and further obtaining which angular range the chute of the distributing device is positioned in at the moment so as to realize the positioning of the rotating angle of the chute of the distributing device. In this application, at first judge whether rotation angle encoder's operation is normal, if rotation angle encoder operation is unusual, then change the mode for realizing the rotation angle location by control program immediately, make the distributing device chute continue accurate cloth, guarantee production goes on smoothly, has improved the reliability and the stability of distributing device chute.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a positioning method for a chute of a blast furnace distributing device provided by an embodiment of the invention;
fig. 2 is a schematic diagram illustrating the division of the rotation cycle of the chute of the distributor according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic flow chart of a positioning method for a chute of a blast furnace distributor according to an embodiment of the present invention is provided. With reference to fig. 1, the method for positioning the chute of the blast furnace distributor in the present application comprises the following steps:
step S110: judging whether a rotation angle encoder runs abnormally, wherein the rotation angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device;
be provided with the rotation angle encoder on distributing device chute rotating electrical machines's the universal driving shaft, this rotation angle encoder can produce binary code, and the PLC controller can gather its binary code that produces to the location of calculating distributing device chute rotation angle is handled. However, the rotational angle encoder is subjected to a high temperature and high pollution environment for a long time in a severe environment of blast furnace iron making, and the encoding stability is lowered. In this application, whether the running state of the rotary encoder is abnormal or not is judged at first, and the specific process is as follows:
the binary code generated by the rotary angle encoder is acquired in real time through the PLC, and whether the binary code generated by the rotary angle encoder is acquired or not or whether the acquired binary code of the rotary angle encoder is normal or not is judged. If the binary code of the rotary angle encoder cannot be acquired, that is, the rotary angle encoder is damaged, the binary code cannot be generated, and the PLC controller does not have a data source of the rotary angle encoder. Or a binary coding error which is generated when the binary code acquired to the rotation angle encoder is abnormal, that is, the rotation angle encoder is unstable and is subjected to other disturbances. When the above occurs, the operation of the rotary angle encoder is abnormal.
Step S120: if the rotation angle encoder runs abnormally, starting a timing function, and recording the rotation time of the chute of the distributing device in real time;
step S130: dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5;
the rotation period is the time for the chute of the distributing device to rotate for one circle, and the acquisition method of the rotation period comprises the following steps: and a limit switch is arranged on the rotating motor in advance and electrically connected with a timer. And when the iron sheet on the linkage shaft of the rotating motor passes through the limit switch, starting the timer, and when the iron sheet passes through the limit switch again, stopping the timer, and obtaining the time for the chute of the distributing device to rotate for one circle by observing the timing of the timer. Alternatively, the time for one revolution of the chute is measured by an operator on site.
Dividing the rotation time of the distributor chute recorded in real time by the rotation period to obtain a quotient, namely how many turns the distributor chute rotates in the distribution process.
Referring to fig. 2, a schematic diagram of the division of the rotation cycle of the chute of the distributing device provided by the embodiment of the present invention is shown. In the distributing process of the distributing device chute, each time the material flow valve is opened, the position where the material distribution is started is called as the material head, the position where the material distribution is finished is called as the material tail, and in order to reduce the phenomenon that the material head and the material tail are uneven, after each batch of material distribution is finished, the distributing device chute automatically steps by 60 degrees. Therefore, in the present application, the rotation period of the distributor chute is equally divided into six, and divided into six sections, T0, T1, T2, T3, T4 and T5, each of which occupies an angle of 60 °.
Step S140: and judging the section of the remainder variable, and positioning the rotation angle of the chute of the distributing device.
The interval T0-T5 corresponds to 0-60 degrees, 60-120 degrees, 120-180 degrees, 180-240 degrees, 240-300 degrees and 300-360 degrees in sequence. Judging the belonged interval of the remainder variable, and when the remainder variable is in the interval T0, positioning the chute of the distributing device between 0 and 60 degrees; when the remainder variable is positioned in the interval T1, the chute of the distributing device passes through 60-120 degrees; when the remainder variable is positioned in the interval T2, the chute of the distributing device passes through 120-180 degrees; when the remainder variable is positioned in the interval T3, the chute of the distributing device passes through 180-240 degrees; when the remainder variable is positioned in the interval T4, the chute of the distributing device passes through 240-300 degrees; when the remainder variable is in the interval T5, the distributor chute passes between 300 ° -360 ° (0 °). Likewise, the distributor chute is automatically stepped by 60 ° before the next distribution is started.
In this application, at first judge whether rotation angle encoder's operation is normal, if rotation angle encoder operation is unusual, then change the mode for realizing the rotation angle location by control program immediately, make the distributing device chute continue accurate cloth, guarantee production goes on smoothly, has improved the reliability and the stability of distributing device chute.
In order to further optimize the above technical solution, it is considered that, in the distribution process of the distributor chute, besides the rotation angle of the distributor chute is controlled by the rotating motor, the tilting angle of the distributor chute needs to be controlled by the tilting motor, and the tilting angle is also an important part in the distribution process of the distributor chute. The chute of the distributing device rises to a certain tilting angle according to the process requirements, and simultaneously rotates at a constant speed in the horizontal plane direction, so that the furnace burden is uniformly distributed in the throat of the blast furnace. Therefore, the positioning of the chute of the distributing device also refers to the basis for guiding the operator to make a material distribution list. In this application, the method for positioning the chute of the blast furnace distributor further comprises: collecting binary codes generated by two tilting angle encoders, wherein the two tilting angle encoders are respectively arranged at two ends of a linkage shaft of a chute tilting motor of the distributing device, each tilting angle encoder generates a corresponding binary code, and the two tilting angle encoders are arranged on the same linkage shaft, so that the obtained numerical values are necessarily the same. The PLC selects a binary code of one of the tilting angle encoders optionally, and calculates and processes to obtain the tilting angle of the chute of the distributing device. If the binary code data of the current tilt angle encoder is found to be abnormal in the process, switching to the binary code of the other tilt angle encoder, and performing processing calculation through the binary code generated by the other tilt angle encoder. At this time, the operator can repair the damaged tilt angle encoder.
Because the distributing device chute is in comparatively abominable environment, so, this application is when fixing a position tilting angle, all is equipped with tilting angle encoder at tilting motor's interlock axle both ends. When one of the two codes is damaged, the PLC controller immediately switches to the other tilt angle encoder to process the other set of binary coded data. The operating personnel in time overhauls the tilting angle encoder that damages, and the distribution process is not hindered to this process, has ensured on the tilting angle that the distributing device chute continues accurate cloth, and the guarantee production goes on smoothly, has improved the reliability and the stability of whole distributing device chute.
In this application, carry out real-time accurate location to rotation angle and angle of fascinating, instruct operating personnel to formulate more accurate cloth bill of material. The furnace burden can be uniformly distributed in the furnace in an annular motion manner through the accurate positioning rotation angle, and the vertical angle of the chute of the distributing device, namely the radius of the distributing ring, can be accurately controlled through the accurate positioning tilting angle. This application has improved the cloth precision of distributing device chute greatly through the accurate positioning to these two angles of rotation angle and angle of fascinating, has improved the reliability and the stability of whole distributing device chute.
Based on the same technical concept, the embodiment of the invention also provides a positioning system of the chute of the blast furnace distributing device, which comprises:
the judging module is used for judging whether the running of a rotary angle encoder is abnormal or not, wherein the rotary angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device;
the timing module is used for starting a timing function and recording the rotation time of the chute of the distributing device in real time if the rotation angle encoder runs abnormally;
the computing module is used for dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5;
and the comparison module is used for judging the section to which the remainder variable belongs and positioning the rotation angle of the chute of the distributing device.
Further, the system further comprises: and the rotation angle encoder is in communication connection with the PLC and is used for generating binary codes and transmitting the binary codes to the PLC.
The positioning system of the blast furnace distributing device chute provided by the embodiment of the invention also comprises: a period acquisition module, the period acquisition module comprising: the limit switch is arranged on the rotating motor and is electrically connected with the timer;
the period acquisition module further includes: the starting unit is used for starting the timer when an iron sheet on a linkage shaft of the rotating motor passes through the limit switch; and the stopping unit is used for stopping the timer when the iron sheet passes through the limit switch again.
In addition, the system further comprises: both ends of a universal driving shaft of the chute tilting motor of the distributing device are provided with tilting angle encoders, and the two tilting angle encoders are in communication connection with the PLC.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (9)
1. A method of positioning a blast furnace distributor chute, said method comprising:
judging whether a rotation angle encoder runs abnormally, wherein the rotation angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device;
if the rotation angle encoder runs abnormally, starting a timing function, and recording the rotation time of the chute of the distributing device in real time;
dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5;
and judging the section of the remainder variable, and positioning the rotation angle of the chute of the distributing device.
2. The method of positioning a blast furnace distributor chute according to claim 1, further comprising:
collecting binary codes generated by two tilting angle encoders, wherein the two tilting angle encoders are respectively arranged at two ends of a linkage shaft of a chute tilting motor of the distributing device;
and (3) selecting a binary code of one tilting angle encoder, and processing to obtain the tilting angle of the chute of the distributing device, wherein if the binary code data of the current tilting angle encoder is abnormal, the binary code of the other tilting angle encoder is switched.
3. The method of positioning a blast furnace distributor chute according to claim 1 wherein said determining whether the rotary encoder is operating abnormally comprises:
the PLC judges whether the binary code generated by the rotation angle encoder is acquired or not, or whether the acquired binary code of the rotation angle encoder is normal or not;
if the binary code of the rotation angle encoder cannot be acquired or if the binary code of the rotation angle encoder is abnormal, the rotation angle encoder operates abnormally.
4. The method of claim 1, wherein the rotating electrical machine is provided with a limit switch electrically connected to a timer, and wherein the obtaining of the rotation period of the chute of the blast furnace distributor comprises:
when an iron sheet on a linkage shaft of the rotating motor passes through the limit switch, starting the timer;
and stopping the timer when the iron sheet passes through the limit switch again.
5. The method of claim 1, wherein said intervals T0-T5 correspond to 0 ° -60 °, 60 ° -120 °, 120 ° -180 °, 180 ° -240 °, 240 ° -300 °, and 300 ° -360 ° in sequence, and said determining the interval to which the remainder variable belongs to position the rotation angle of the chute comprises:
when the remainder variable is positioned in the interval T0, the chute of the distributing device is positioned between 0 and 60 degrees;
when the remainder variable is positioned in the interval T1, the chute of the distributing device passes through 60-120 degrees;
when the remainder variable is positioned in the interval T2, the chute of the distributing device passes through 120-180 degrees;
when the remainder variable is positioned in the interval T3, the chute of the distributing device passes through 180-240 degrees;
when the remainder variable is positioned in the interval T4, the chute of the distributing device passes through 240-300 degrees;
when the remainder variable is in the interval T5, the distributor chute passes through 300-360 degrees.
6. A positioning system for a blast furnace distributor chute, said system comprising:
the judging module is used for judging whether the running of a rotary angle encoder is abnormal or not, wherein the rotary angle encoder is arranged on a linkage shaft of a chute rotating motor of the distributing device;
the timing module is used for starting a timing function and recording the rotation time of the chute of the distributing device in real time if the rotation angle encoder runs abnormally;
the computing module is used for dividing the rotation time by the rotation period of the chute of the distributing device to obtain a remainder variable, wherein the rotation period is divided into six equal parts and is respectively marked as an interval from T0 to T5;
and the comparison module is used for judging the section to which the remainder variable belongs and positioning the rotation angle of the chute of the distributing device.
7. The positioning system for a blast furnace distributor chute as defined in claim 6 further comprising:
the rotation angle encoder is in communication connection with a PLC controller and is used for generating a binary code and transmitting the binary code to the PLC controller.
8. The positioning system for a blast furnace distributor chute as defined in claim 6 further comprising: a period acquisition module, the period acquisition module comprising: the limit switch is arranged on the rotating motor and is electrically connected with the timer;
the period acquisition module further includes:
the starting unit is used for starting the timer when an iron sheet on a linkage shaft of the rotating motor passes through the limit switch;
and the stopping unit is used for stopping the timer when the iron sheet passes through the limit switch again.
9. The positioning system for a blast furnace distributor chute as defined in claim 6 further comprising: and two tilting angle encoders are arranged at two ends of a linkage shaft of the chute tilting motor of the distributing device and are in communication connection with the PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020225.2A CN112708711A (en) | 2019-10-25 | 2019-10-25 | Positioning method and system for chute of blast furnace distributing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020225.2A CN112708711A (en) | 2019-10-25 | 2019-10-25 | Positioning method and system for chute of blast furnace distributing device |
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| CN112708711A true CN112708711A (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911020225.2A Withdrawn CN112708711A (en) | 2019-10-25 | 2019-10-25 | Positioning method and system for chute of blast furnace distributing device |
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| ATA392003A (en) * | 2003-01-14 | 2004-02-15 | Voest Alpine Ind Anlagen | DEVICE FOR CONTROLLED LOADING OF A REACTOR VESSEL |
| CN206666569U (en) * | 2017-03-29 | 2017-11-24 | 首钢京唐钢铁联合有限责任公司 | Control device for chute |
| CN107885943A (en) * | 2017-11-16 | 2018-04-06 | 山信软件股份有限公司 | A kind of blast furnace chute turning angle computational methods |
| CN208151407U (en) * | 2018-05-15 | 2018-11-27 | 河钢股份有限公司承德分公司 | A kind of blast-furnace distributor chute obliquity sensor of high reliability |
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