CN107885943B - Blast furnace chute tilting angle calculation method - Google Patents
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Abstract
The application provides a blast furnace chute tilting angle calculation method, which comprises the following steps: acquiring a real-time Gray code value output by an encoder; converting the real-time gray code value into a real-time integer code value; judging whether a linear code value interval containing a real-time integer code value exists or not; and if the real-time integer code value exists, acquiring a linear function between the integer code value and the tilting angle in the linear code value interval, and acquiring the real-time tilting angle corresponding to the real-time integer code value according to the linear function and the real-time integer code value. According to the blast furnace chute tilting angle calculation method, the real-time tilting angle is calculated according to the linear function, and the calculation efficiency of the tilting angle can be effectively improved; the real-time tilting angles corresponding to all integer code values in the linear code value interval can be calculated, and the continuity and stability of the calculation of the tilting angles are improved.
Description
Technical Field
The application relates to the field of metallurgical industry, in particular to a blast furnace chute tilting angle calculation method.
Background
In the process of distributing materials in a blast furnace, the materials in a material distributor reach the furnace through a chute, and an included angle is formed between the axis of the material distributor and the axis of the chute and is called as the tilting angle of the chute. The tilting angle is adjusted, so that the position of the pile tip of the burden material can be changed, the radial distribution and the burden surface shape of the burden material in the furnace are changed, and the method has important significance for reducing the burden material consumption and improving the productivity of the blast furnace.
Referring to fig. 1, a schematic structural diagram of a tilting angle adjusting system is shown in fig. 1, and the system includes a computer, a programmable logic controller, an encoder, a motor, a tilting structure and a chute. The programmable logic controller is used for calculating a current tilting angle according to the output value, then outputting a control signal to the programmable logic controller according to the relation between a target tilting angle and the current tilting angle, adjusting the real-time rotation of the motor by using the programmable logic controller, and the motor is sequentially connected with the tilting structure and the chute, and the real-time rotation of the motor drives the tilting structure to move so as to realize the adjustment of the tilting angle of the chute. In a bell-less furnace top device with a chute realized by a connecting rod, an encoder output value and a tilting angle are in a nonlinear relation, and the existing method for calculating the current tilting angle according to the output value comprises the following steps: and inquiring a pre-established output value and tilting angle corresponding table to obtain the current tilting angle.
However, since the adjustable range of the tilting angle of the chute is large and the adjustment division value is small, the pre-established output value and tilting angle corresponding table is long, and the control program storage corresponding table occupies a large amount of memory space, which results in low calculation efficiency and slow operation speed of the control program. Meanwhile, the adjacent tilting angles corresponding to the adjacent output values in the corresponding table are separated by an adjustment division value, and when the real-time rotation angle of the motor is between two adjacent tilting angles, the output value of the encoder does not have a corresponding tilting angle in the corresponding table, so that the continuity and stability of the calculated tilting angle are poor.
Disclosure of Invention
The application provides a blast furnace chute tilting angle calculation method, which aims to solve the problem of low tilting angle calculation efficiency.
The application provides a blast furnace chute tilting angle calculation method, which comprises the following steps: acquiring a real-time Gray code value output by an encoder;
converting the real-time gray code value into a real-time integer code value;
judging whether a linear code value interval containing the real-time integer code value exists or not;
and if the real-time integer code value exists, acquiring a linear function between the integer code value and the tilting angle in the linear code value interval, and acquiring the real-time tilting angle corresponding to the real-time integer code value according to the linear function and the real-time integer code value.
Preferably, before acquiring the gray code value output by the encoder, the method further includes:
acquiring an encoder angle and an integer code value corresponding to the chute tilting angle;
dividing the integer code value into a plurality of linear code value intervals according to a difference between adjacent encoder angles;
and calculating to obtain a linear function between the integer code value and the tilting angle according to the initial code value and the end code value of the linear code value interval, the initial tilting angle corresponding to the initial code value and the end tilting angle corresponding to the end code value.
Preferably, obtaining a linear function between the integer code value and the tilt angle within the linear code value interval comprises:
inputting the interval number of the linear code value interval into a multiplexer module of a programmable logic controller, wherein the multiplexer module is used for acquiring a start code value and an end code value corresponding to the interval number, a start tilting angle corresponding to the start code value and an end tilting angle corresponding to the end code value;
and calculating to obtain a linear function between the integer code value and the tilting angle in the linear code value interval according to the starting code value and the end code value, the starting tilting angle corresponding to the starting code value and the end tilting angle corresponding to the end code value.
Preferably, the converting the real-time gray code value into a real-time integer code value includes:
converting the real-time gray code value into a real-time binary value;
converting the real-time binary value into a real-time integer code value.
Preferably, the converting the real-time gray code value into a real-time binary value includes:
converting the highest bit of the real-time gray code value into the highest bit of a real-time binary value;
and exclusive OR is carried out on the next highest bit of the real-time gray code value and the highest bit of the real-time binary value to obtain the next highest bit of the real-time binary value.
Preferably, the method for converting the real-time binary value into the real-time integer code value comprises the following steps: the conversion is performed using the BIT _ TO _ WORD instruction module of the programmable logic controller.
Preferably, the method for determining whether there is a linear code value interval containing the real-time integer code value includes: and judging by utilizing the GE _ INT of the programmable logic controller to be more than or equal to the functional block and the LT _ INT to be less than the functional block.
Preferably, the method further comprises: if not, the real-time integer code value is discarded.
The blast furnace chute tilting angle calculation method provided by the application has the beneficial effects that:
according to the blast furnace chute tilting angle calculation method, the real-time Gray code value output by the encoder is converted into the real-time integer code value, the linear function of the linear code value interval is obtained according to the linear code value interval where the real-time integer code value is located, and the real-time tilting angle corresponding to the real-time integer code value is calculated. By using the blast furnace chute tilting angle calculation method provided by the application, only the initial code value and the end code value of the linear code value interval, the initial tilting angle corresponding to the initial code value and the end tilting angle corresponding to the end code value need to be stored, and then the real-time tilting angle can be calculated according to the linear function without storing the whole corresponding table, so that the calculation efficiency of the tilting angle can be effectively improved; furthermore, the real-time tilting angle is calculated according to the linear code value interval where the real-time integer code value is located, the real-time tilting angle corresponding to all integer code values in the linear code value interval can be calculated, the problem that only data of interval adjustment division values can be stored in a corresponding table is solved, and the continuity and the stability of the calculation of the tilting angle are improved.
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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 any creative effort.
FIG. 1 is a schematic diagram of a tilt angle adjustment system;
fig. 2 is a schematic flow chart of a blast furnace chute tilting angle calculation method provided in an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for dividing a linear code value interval according to an embodiment of the present application;
fig. 4 is a schematic diagram of converting a gray code into a binary code according to an embodiment of the present application.
Detailed Description
Referring to fig. 2, a schematic flow chart of a blast furnace chute tilting angle calculation method provided in the embodiment of the present application is shown, and as shown in fig. 2, the blast furnace chute tilting angle calculation method provided in the embodiment of the present application specifically includes the following steps:
step S110: and acquiring the real-time gray code value output by the encoder.
Specifically, the encoder is an absolute value encoder connected to the motor. The encoder automatically outputs gray code values of corresponding bits once in one scanning period (typically 10ms) according to its own precision, such as 12 bits, 14 bits, 17 bits, etc. In this embodiment, the encoder outputs a gray code value of 12 bits every 10 ms. Accordingly, a digital quantity module of a PLC (Programmable Logic Controller) receives a gray code value output from an encoder every other scanning period (10 ms).
Step S120: and converting the real-time gray code value into a real-time integer code value.
Specifically, because the gray code is a non-weighted code and cannot directly reflect the current angle value, the gray code must be converted into a binary code capable of reflecting the actual position of the current chute, and then further converted into integer data.
In this embodiment, the real-time gray code value obtained in step S110 is converted into a real-time binary code value, and the conversion method includes hardware conversion and software conversion. The software conversion comprises a formula method and a table look-up method, wherein the formula method is a conversion formula from Gray codes to binary codes established according to a Carnot graph, and a real-time binary code value is obtained through calculation; the table look-up method is to look up the real-time binary code value corresponding to the real-time gray code value according to a pre-established corresponding table of gray codes and binary codes.
The table look-up method needs a large storage space to store the corresponding table of the gray code and the binary code, and the look-up efficiency is low. Hardware conversion is performed by adopting a hardware circuit, gray codes are converted into binary codes and then input into the PLC for next conversion, and the cost of the system is increased due to the fact that the hardware circuit is adopted for conversion, so that the formula method is preferably used for conversion in the embodiment.
The conversion is carried out by using a formula method, and the conversion can be carried out by using a 'bit exclusive or' instruction in a 'bit operation' function of the PLC. For the fact that no bit xor instruction exists in part of the PLC, the present embodiment provides a method for converting gray code into binary code by analyzing a conversion rule between gray code and binary code: the XOR operation is realized by AND, OR and NOT, so that the bit XOR is realized, and the conversion process is as follows:
converting the highest bit of the real-time gray code value into the highest bit of a real-time binary value; and exclusive OR is carried out on the next highest bit of the real-time gray code value and the highest bit of the real-time binary value to obtain the next highest bit of the real-time binary value. By analogy, the real-time binary value is obtained until the 12-bit gray code is completely converted, and the specific conversion formula is as follows:
C1＝Rn，
…
in the formula, Rn is a Gray code with n bits, and Cn is a binary code converted from Rn. Referring to fig. 4, a schematic diagram of a process of converting gray code 1001 into binary code provided in an embodiment of the present application is shown according to the above formula, where an equivalent formula of fig. 4 is as follows:
C4＝R4＝1
as can be seen, gray code 1001 is converted to binary code 1110.
Then, through the BIT _ TO _ WORD instruction module, converting the binary value of the BOOL data type into the integer code value INT of the WORD type: INT 23+22+21+2o＝14。
In specific implementation, the conversion process of converting the real-time gray code value into the integer code value is written into a subroutine Encorder12, and the subroutine is called after the real-time gray code value is received.
The real-time gray code value is converted into the real-time integer code value by using the conversion method, and compared with the method that the gray code is converted into the binary code and then input into the PLC by using a hardware circuit, the system cost is saved; compared with a table lookup method, the storage space used is small. Moreover, the conversion method is simple and accurate in conversion, high in conversion speed and beneficial to stable operation of the tilting angle adjusting system.
Step S130: and judging whether a linear code value interval containing the real-time integer code value exists or not.
Specifically, the linear code value interval is a plurality of integer code value intervals divided in advance, referring to fig. 3, which is a schematic flow chart of a method for dividing the linear code value interval provided in the embodiment of the present application, and as shown in fig. 3, the linear code value interval dividing method specifically includes the following steps:
step S100: acquiring an encoder angle and an integer code value corresponding to the chute tilting angle;
specifically, the effective adjustment range of the chute tilting angle is obtained first, in this embodiment, the effective adjustment range of the chute tilting angle is 13 to 75 degrees, and beyond this range, the motor cannot drive the tilting mechanism to normally work.
Then, an adjustment division value of the chute tilting angle is obtained, in the implementation, the adjustment division value is 0.1 degree, 650 chute tilting angle adjustment values are arranged in an encoder output value and tilting angle corresponding table according to a table look-up method in the prior art, 650 integer code values respectively correspond to the 650 tilting angles, the tilting angles are calculated by using the table look-up method, the 650 tilting angles and the 650 integer code values need to be assigned one by one, the implementation is complex, and a large storage space is needed for storing the corresponding table.
And finally, respectively acquiring the encoder angles corresponding to the 650 tilting angles from the encoder output value and tilting angle corresponding table.
Step S101: dividing the integer code value into a plurality of linear code value intervals according to the difference between the angles of the adjacent encoders; specifically, in step S100, the difference between the angles of the adjacent encoders is calculated, and the two equal differences are divided into a section. In this embodiment, 650 code values are divided into 29 intervals, as shown in table 1:
TABLE 1
In table 1, the chute tilting angle (including the initial angle and the end point angle) and the encoder code value (including the initial code value and the end point code value) corresponding to each interval number k are stored, and compared with the table lookup method in the prior art, 650 tilting angles and corresponding code values need to be stored, occupation of storage space is reduced, and calculation efficiency is improved.
Step S102: and calculating to obtain a linear function between the integer code value and the tilting angle according to the initial code value and the end code value of the linear code value interval, the initial tilting angle corresponding to the initial code value and the end tilting angle corresponding to the end code value.
Specifically, in the established linear code value interval, the linear function between the integer code value and the tilting angle is as follows:
the method comprises the steps of obtaining an Angle value, a StartAng value and an EndEnc value, wherein the Angle is a real-time tilting Angle, the Data is a real-time integer code value, the StartAng is an initial Angle in a chute tilting Angle, the EndAng is an end Angle in the chute tilting Angle, the StartEnc is an encoder initial code value, and the EndEnc is an encoder end code value.
The linear function is a piecewise function, and in specific implementation, the piecewise function is written into a subroutine Date _ cut of the PLC for calculating the real-time tilting angle in the subsequent steps.
After linear code value intervals are divided in advance according to the steps S100-S102, the linear code value interval where the real-time integer code value is located is judged for the real-time integer code value obtained in the step S120. In this embodiment, the GE _ INT of the PLC is greater than or equal to the functional block, and the LT _ INT is smaller than the functional block, so as to determine the linear code value interval where the real-time integer code value is located. The method specifically comprises the following steps: selecting a linear code value interval, judging whether the real-time integer code value is larger than an encoder initial code value of the linear code value interval by utilizing the GE _ INT which is larger than or equal to the functional block, if so, judging whether the real-time integer code value is smaller than an encoder end code value of the linear code value interval by utilizing the LT _ INT which is smaller than the functional block, and if so, acquiring an interval number k of the linear code value interval. In this embodiment, the real-time integer value Data is 2000, there is a code value interval 500-.
Step S140: and if the real-time integer code value exists, acquiring a linear function between the integer code value and the tilting angle in the linear code value interval, and acquiring the real-time tilting angle corresponding to the real-time integer code value according to the linear function and the real-time integer code value.
Specifically, the interval number k is input to a multiplexer module, and the multiplexer module is configured to obtain a start code value and an end code value corresponding to the interval number k, a start tilt angle corresponding to the start code value, and an end tilt angle corresponding to the end code value. Inputting k to 18 into the multiplexer, obtaining a start code value StartEnc of 500, an end code value EndEnc of 2218, a start tilt angle StartAng corresponding to the start code value of 22.9, an end tilt angle EndAng corresponding to the end code value of 63.4, calling a subroutine Date _ cut, and calculating to obtain a real-time tilt angle as follows:
further, if a linear code value interval containing the real-time integer code value does not exist, the real-time integer code value can be judged to be an invalid code value, the real-time integer code value is discarded, and the tilting angle corresponding to the real-time integer code value is not calculated.
According to the blast furnace chute tilting angle calculation method, the real-time Gray code value output by the encoder is converted into the real-time integer code value, the linear function of the linear code value interval is obtained according to the linear code value interval where the real-time integer code value is located, and the real-time tilting angle corresponding to the real-time integer code value is calculated. By using the blast furnace chute tilting angle calculation method provided by the application, only the initial code value and the terminal code value of the linear code value interval, the initial tilting angle corresponding to the initial code value and the terminal tilting angle corresponding to the terminal code value need to be stored, and then the real-time tilting angle can be calculated according to the linear function, so that the problem that when the chute tilting angle and the encoder output code value are in a nonlinear relation, all chute tilting angles and the encoder output code value corresponding table need to be stored is solved; furthermore, the real-time tilting angle is calculated according to the linear code value interval where the real-time integer code value is located, the tilting angles corresponding to all integer code values in the linear code value interval can be calculated, the problem that only data of interval adjustment division values can be stored in a corresponding table is solved, the continuity of tilting angle calculation is greatly improved, and the stable production of a blast furnace is promoted.
The blast furnace chute tilting angle calculation method provided by the application realizes accurate positioning of the tilting angle in the material distribution process, has the advantages of real-time performance, stability, high efficiency and the like, is favorable for realizing uniform material distribution of the chute, enables the charge level in the blast furnace to be flat and enables the gas distribution to be reasonable. The response speed of the system is improved, the anti-interference capability is enhanced, and the steady-state precision is improved. Can be popularized to the control of other nonlinear production process equipment, and has good popularization and application values.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (7)
1. A blast furnace chute tilting angle calculation method is characterized by comprising the following steps:
acquiring an encoder angle and an integer code value corresponding to the chute tilting angle;
dividing the integer code value into a plurality of linear code value intervals according to a difference between adjacent encoder angles;
calculating to obtain a linear function between the integer code value and the tilting angle according to the initial code value and the end code value of the linear code value interval, the initial tilting angle corresponding to the initial code value and the end tilting angle corresponding to the end code value;
acquiring a real-time Gray code value output by an encoder;
converting the real-time gray code value into a real-time integer code value;
judging whether a linear code value interval containing the real-time integer code value exists or not;
and if the real-time integer code value exists, acquiring a linear function between the integer code value and the tilting angle in the linear code value interval, and acquiring the real-time tilting angle corresponding to the real-time integer code value according to the linear function and the real-time integer code value.
2. The blast furnace chute tilting angle calculation method of claim 1, wherein obtaining a linear function between the integer code value and the tilting angle within the linear code value interval comprises:
inputting the interval number of the linear code value interval into a multiplexer module of a programmable logic controller, wherein the multiplexer module is used for acquiring a start code value and an end code value corresponding to the interval number, a start tilting angle corresponding to the start code value and an end tilting angle corresponding to the end code value;
and calculating to obtain a linear function between the integer code value and the tilting angle in the linear code value interval according to the starting code value and the end code value, the starting tilting angle corresponding to the starting code value and the end tilting angle corresponding to the end code value.
3. The blast furnace chute tilt angle calculation method of claim 1, wherein said converting the real-time gray code value to a real-time integer code value comprises:
converting the real-time gray code value into a real-time binary value;
converting the real-time binary value into a real-time integer code value.
4. The blast furnace chute tilt angle calculation method of claim 3, wherein said converting said real-time gray code value to a real-time binary value comprises:
converting the highest bit of the real-time gray code value into the highest bit of a real-time binary value;
and exclusive OR is carried out on the next highest bit of the real-time gray code value and the highest bit of the real-time binary value to obtain the next highest bit of the real-time binary value.
5. The blast furnace chute tilting angle calculation method of claim 3, wherein said conversion method of said real-time binary value into a real-time integer code value is: the conversion is performed using the BIT _ TO _ WORD instruction module of the programmable logic controller.
6. The blast furnace chute tilting angle calculating method according to claim 1, wherein said judging whether or not there is a linear code value section containing said real-time integer code value is by: and judging by utilizing the GE _ INT of the programmable logic controller to be more than or equal to the functional block and the LT _ INT to be less than the functional block.
7. The blast furnace chute tilt angle calculation method of claim 1, further comprising: if not, the real-time integer code value is discarded.
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| CN112708711A (en) * | 2019-10-25 | 2021-04-27 | 莱芜钢铁集团电子有限公司 | Positioning method and system for chute of blast furnace distributing device |
| CN113110278B (en) * | 2021-04-13 | 2022-05-27 | 珠海格力智能装备有限公司 | Information interaction method and device, storage medium and processor |
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