Automatic control method for material level of sintering ring cold ore discharging groove based on peak clipping technology

Abstract

The invention discloses a peak clipping technology-based automatic control method for the material level of a sintering ring cold ore unloading groove, which comprises the following steps of: S1, acquiring a first material level at a set time interval; wherein the first material level is the average value of three nearest second material levels, and the second material levels are the current material levels of the annular cooling ore unloading groove which are collected every set time interval; s2, peak values of the material levels are obtained according to the first material level, and the average material level between the two adjacent peak values is calculated; s3, the frequency of the plate type ore feeder is adjusted according to the relation between the average material level and the preset material level; and S4, repeating the steps. According to the method, the characteristic of material level fluctuation of the annular cooling ore unloading groove can be fully considered, and the situation that adjustment is mistakenly triggered due to the fact that the material level peak value or valley value is obtained is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of plate-type ore feeder control, and in particular to an automatic control method for a material level of a sintering ring cold unloading ore trough based on a peak clipping technology. Background Art

[0002] After the sintered ore is cooled by the annular cooler, it enters the annular cooler unloading chute under the annular cooler. The annular cooler unloading chute has a buffering effect on the discharge of the cooled sintered ore. During production, the material level of the annular cooler unloading chute cannot be too high, so as to prevent the finished ore in the chute from hindering the normal operation of the annular cooler trolley, but it cannot be too low, otherwise it will cause uneven discharge of the sintered ore, and the high drop will have an adverse effect on the particle size of the sintered ore. Due to the limitations of installation conditions, the capacity of the annular cooler unloading chute is generally small, which makes it very difficult to automatically control the material level. During normal production, the speed of the plate feeder under the annular cooler unloading chute is related to the speed of the annular cooler trolley, that is, the speed of the plate feeder is proportional to the speed of the annular cooler trolley. The material level of the annular cooler unloading chute is generally controlled between 30% and 70% of the chute. When the material level setting value of the annular cooler unloading chute deviates too much from the measured value, the material level of the annular cooler unloading chute is controlled by adjusting the speed of the plate feeder to change the discharge amount of the annular cooler unloading chute.

[0003] The material level control of the ring cooling unloading trough requires that the material level of the ring cooling unloading trough be controlled between 30% and 70% of the trough position. When the material level setting value of the ring cooling unloading trough deviates too much from the measured value, the discharge amount of the ring cooling unloading trough is changed by adjusting the frequency (speed) of the plate feeder to realize the material level control of the ring cooling unloading trough. Since the process of sintered ore entering the ring cooling unloading trough from the ring cooling machine is not continuous, the material level of the ring cooling unloading trough will have a peak value every time the ring cooling machine turns over a trolley. It can be found from the monitoring curve of the material level of the ring cooling unloading trough that the curve is wavy.

[0004] At present, the material level control of the ring cooling unloading trough mostly adopts real-time acquisition of material level value or directly uses the average material level over a period of time to determine the material level range according to the production control requirements, and triggers the adjustment of the speed of the plate feeder; there are also methods that use fuzzy control theory to comprehensively consider the material level and material level change trend of the ring cooling unloading trough to trigger the adjustment of the plate feeder frequency (speed). Both methods ignore the characteristics of the material level fluctuation of the ring cooling unloading trough, and it is inevitable that the adjustment will be triggered incorrectly due to the acquisition of the material level peak or valley value.

[0005] How to reduce the problem of erroneous triggering of adjustments due to the material level being at a peak or valley value based on the characteristics of the material level fluctuation in the ring cooling unloading trough is one of the important issues that need to be solved urgently in this field. Summary of the invention

[0006] The purpose of the present invention is to provide an automatic control method for the material level of a sintering ring cooling unloading trough based on peak clipping technology to solve the deficiencies in the prior art. It can fully consider the characteristics of the material level fluctuation of the ring cooling unloading trough and avoid erroneous triggering of adjustments due to obtaining the material level peak or valley value.

[0007] The present invention provides an automatic control method for the material level of a sintering ring cold unloading ore trough based on peak shaving technology, which includes:

[0008] S1, obtain the first material level at each set time interval; wherein the first material level is the average value of the three most recent second material levels, and the second material level is the current ring cooling unloading trough material level collected at each set time interval.

[0009] S2, obtaining a peak value of the material level according to the first material level, and calculating an average material level between two adjacent peak values;

[0010] S3, adjusting the frequency of the plate feeder according to the relationship between the average material level and the preset material level;

[0011] S4, repeat steps S1 to S3.

[0012] As described above, the automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology, wherein, optionally, step S2 includes the following specific steps:

[0013] S21, after the interval setting time, obtain the three most recent first material levels;

[0014] S22, obtain peak value;

[0015] S23, calculating the average material level between the current peak value and the previous peak value.

[0016] As described above, the automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology, wherein, optionally, step S22 includes:

[0017] S221, sorting the three first material levels according to the acquisition time;

[0018] S222, determine whether the first material level in the middle is the maximum value among the three; if so, take the first material level in the middle as the peak value; if not, obtain the first material level after the interval is set for a period of time.

[0019] As described above, the automatic control method for the material level of the sintering ring cold unloading ore trough based on the peak clipping technology, wherein, optionally, in step S222, after determining the first material level in the middle as the peak value, further comprising the following steps:

[0020] S223, determine whether the peak value is the first peak value after startup; if yes, obtain the first material level after the interval setting time; if no, execute step S23.

[0021] The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology as described above, wherein, optionally, the pre-set material level includes a first predetermined value and a second predetermined value;

[0022] The first predetermined value is greater than the second predetermined value;

[0023] Obtain the average material level and compare it with the first predetermined value and the second predetermined value respectively.

[0024] When the average material level is greater than the first predetermined value, the frequency of the plate feeder is increased according to the set adjustment amount;

[0025] When the average material level is less than a second predetermined value, the frequency of the plate feeder is reduced according to a set adjustment amount;

[0026] When the average material level is between the first predetermined value and the second predetermined value, the frequency of the apron feeder is kept unchanged.

[0027] As described above, the automatic control method of the material level of the sintering ring cold unloading ore chute based on the peak shaving technology, wherein, optionally, the adjustment amount is set to 0.05 to 0.2.

[0028] As described above, the automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology, wherein, optionally, the setting time length is 0.5 to 2 seconds.

[0029] As described above, the automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology, wherein, optionally, step S2 is replaced by,

[0030] S02, performing peak clipping processing on the first material level, and obtaining an average material level between two adjacent valley values.

[0031] As described above, the automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology, wherein, optionally, step S02 includes the following specific steps:

[0032] S021, set the interval time to obtain the three most recent first material levels;

[0033] S022, obtaining the valley value;

[0034] S023, calculating the average material level between the current valley value and the previous valley value.

[0035] As described above, the automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology, wherein, optionally, step S022 includes:

[0036] S0221, sort the three first material levels according to the acquisition time;

[0037] S0222, determine whether the first material level in the middle is the minimum value among the three; if so, take the first material level in the middle as the valley value; if not, obtain the first material level after the interval setting time.

[0038] Compared with the prior art, the present invention obtains the average value of the first material level data between two peak values ​​or two valley values ​​and compares it with the set material level, thereby triggering the adjustment of the speed of the plate feeder. The first material level is compared with the set material level after peak clipping, which is enough to solve the problem of erroneous triggering due to obtaining the peak material level. Moreover, since the interval time from adjusting the frequency (speed) of the plate feeder to the material level feedback is very short, the control purpose can be well achieved without using fuzzy control ideas. Therefore, the present invention uses the material level data after peak clipping to directly compare and judge with the set material level to trigger the adjustment, which is simple and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a process structure diagram of the ring cooler proposed by the present invention;

[0040] Figure 2 It is the monitoring curve of the material level of the ring cooling unloading trough;

[0041] Figure 3 is a flowchart of the steps of the method proposed in Example 1;

[0042] Figure 4 is a flowchart of the specific steps of step S2;

[0043] Figure 5 is a specific step flow chart of step S22;

[0044] Figure 6 is a flow chart of the steps of data collection and processing in Example 1;

[0045] Figure 7 It is a flow chart of the steps for material level control in Example 1.

[0046] Description of reference numerals:

[0047] 1- Annular cooler, 2- Annular cooler unloading chute, 3- Plate feeder. DETAILED DESCRIPTION

[0048] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0049] like Figure 1As shown, the process structure used in the present invention includes an annular cooler 1, an annular cooler unloading chute 2 and a plate feeder 3, wherein the annular cooler 1 discharges the cooled sintered ore to the annular cooler unloading chute 2, and after being buffered by the annular cooler unloading chute 2, the sintered ore is discharged to the plate feeder 3. Since the process of the sintered ore entering the annular cooler unloading chute 2 from the annular cooler 1 is not continuous, a peak value will appear in the material level of the annular cooler unloading chute 2 every time a trolley of the annular cooler 1 turns over. It can be found from the monitoring curve of the material level of the annular cooler unloading chute 2 that the curve is wavy, as shown in FIG. Figure 2 In the present application, in order to reduce the problem of erroneous triggering adjustment caused by fluctuation of material level in the ring cooling unloading trough, the present invention proposes the following embodiments.

[0050] Example 1

[0051] Please refer to Figures 3 to 5 This embodiment proposes an automatic control method for the material level of a sintering ring cold unloading ore trough based on peak shaving technology, which includes:

[0052] S1, obtain the first material level at each interval setting time; in specific implementation, the set time can be set to 0.5 to 2 seconds. Among them, 1 second is preferred. The set time is set to 1 second so that the accuracy of determining the peak value can be controlled within a smaller range. For the sintering ring cooling unloading trough, its accuracy is already high, and there is no need to set the set time to less than 0.5. Among them, the first material level is the average of the three most recent second material levels, and the second material level is the current ring cooling unloading trough material level collected at each interval setting time.

[0053] S2, obtaining the peak value of the material level according to the first material level, and calculating the average material level between two adjacent peak values. Specifically, in this embodiment, the average material level between two adjacent peak values ​​is used as an important parameter for controlling the frequency of the plate feeder, which can avoid erroneous triggering of adjusting the frequency of the plate feeder due to the material level being a peak value or a valley value.

[0054] The peak cutting process for the first material level is one of the key improvements of the present invention, and specifically includes the following specific steps:

[0055] S21, acquiring the three most recent first material levels at intervals of a set time; that is, acquiring the first material level at the current moment, the first material level one set time ago, and the first material level two set time ago.

[0056] S22, obtaining a peak value; specifically, the three most recent first material levels may be used to determine whether the middle one of the current three first material levels is a peak value. Specifically, in this step, the following steps may be used to implement the process.

[0057] S221, sorting the three first material levels according to the acquisition time; that is, sorting them according to the order of acquisition.

[0058] S222, determine whether the first material level in the middle is the maximum value among the three; if so, take the first material level in the middle as the peak value; if not, obtain the first material level after the set time interval, that is, execute step S1. In specific implementation, when the first material level in the middle is greater than the other two first material levels, the first material level in the middle can be determined as the peak value. Since the first material level is continuously obtained at the set time interval, as the above steps are continuously repeated, and after determining the first material level as the peak value, execute step S23.

[0059] S23, calculate the average material level between the current peak value and the previous peak value. That is, the average material level of the part between the current peak value and the previous peak value is used as an important basis for adjusting the frequency of the plate feeder. In specific implementation, the average value of all second material levels between the current peak value and the previous peak value is taken as the average material level.

[0060] S3, adjusting the frequency of the plate feeder according to the relationship between the average material level and the preset material level. Specifically, the preset material level includes a first preset value and a second preset value; and the first preset value is greater than the second preset value.

[0061] Obtain the average material level and compare it with the first predetermined value and the second predetermined value respectively.

[0062] When the average material level is greater than the first predetermined value, the frequency of the plate feeder is increased according to the set adjustment amount; the set adjustment amount is 0.05 to 0.2. Specifically, 0.1 is preferred. During the implementation process, it can be adjusted as needed.

[0063] When the average material level is less than the second predetermined value, the frequency of the plate feeder is reduced according to the set adjustment amount; the set adjustment amount is 0.05 to 0.2. Specifically, 0.1 is preferred. During the implementation process, it can be adjusted as needed.

[0064] When the average material level is between the first predetermined value and the second predetermined value, the frequency of the plate feeder is kept unchanged. In specific implementation, each time the average material level is obtained, that is, each time the average material level is calculated in step S23, step S3 is executed once.

[0065] S4, repeat step S1 to step S3. That is, in the specific implementation, in the startup state, continuously repeat step S1 to step S3.

[0066] In the above steps, the key to the specific control process is data collection and processing, as well as material level control.

[0067] To illustrate this embodiment, the material level of the annular cooling unloading trough, i.e., the second material level, is recorded as LI, and the frequency setting value of the plate feeder is recorded as SetFrequency. The system reads the material level data LI once per second and stores it in the material level data set LastThreeLI[] of the last 3 seconds. The data set length is 3, i.e., it contains LastThreeLI[0], LastThreeLI[1], and LastThreeLI[2]. The data in LastThreeLI[] is averaged every 3 seconds, and the result is stored in the material level data set LastThreeLIAvg[] of the last 3 seconds. That is, LastThreeLIAvg[] is the average of the three second material levels, namely, LastThreeLIAvg[0], LastThreeLIAvg[1], and LastThreeLIAvg[2], i.e., the first material level. The material level data set LevelList is used to record the material level values ​​between adjacent peaks in order to obtain the average value, and one is collected per second. The first predetermined value is recorded as Level_H, and the second predetermined value is recorded as Level_L.

[0068] like Figure 6 As shown, after startup, the relevant data set is initialized, and then the second material level LI is read and stored in LastThreeLI[] until the data is full, that is, 3 second material levels are stored. Then, the average value in LastThreeLI[] is calculated and stored in LastThreeLIAvg[] until the data is full, that is, 3 first material levels are stored in LastThreeLIAvg[].

[0069] Then determine whether the data in the middle of LastThreeLIAvg[] is a peak value. If not, wait for the set time and collect the second material level, and update LastThreeLI[] and LastThreeLIAvg[]; if so, determine whether the peak is the first peak. If so, clear the LevelList data set, re-collect the second material level after the set time, and update LastThreeLI[] and LastThreeLIAvg[]; if it is not the first peak, calculate the average value of the LevelList data set to obtain the average material level LIAvg between the two peaks, clear the LevelList data set, and then collect the second material level after the set time interval, and update LastThreeLI[] and LastThreeLIAvg[]; repeat the above process with the updated LastThreeLIAvg[] to continue looking for the next peak.

[0070] The above is the process of data collection and processing.

[0071] For level control, please refer to Figure 7 , after receiving LIAvg calculated by the data acquisition and processing module, compare it with the set levels Level_H and Level_L. When LIAvg > Level_H or LIAvg < Level_L, trigger the adjustment of the frequency of the板式给矿机 (plate feeder).

[0072] That is, every time the average level LIAvg is received, compare the average level LIAvg with the first predetermined value Level_H. If the average level LIAvg is greater than the first predetermined value Level_H, increase the frequency of the plate feeder according to the set adjustment amount. Specifically, its frequency can be adjusted to SetFrequency + 0.1. If the average level LIAvg is not greater than the first predetermined value Level_H, then compare the average level LIAvg with the second predetermined value Level_L. If it is not greater than the second predetermined value Level_L, decrease the frequency of the plate feeder according to the set adjustment amount. Specifically, its frequency can be adjusted to SetFrequency - 0.1.

[0073] Embodiment 2

[0074] This embodiment is a further improvement based on Embodiment 1. Specifically, in Embodiment 1, the average level between two adjacent peaks is used as the key parameter for control. In this embodiment, the average level between two adjacent valleys is used as the key parameter for control. The same parts will not be elaborated again. The difference is only in step S2. Only the differences will be described below.

[0075] In this embodiment, step S2 is replaced with S02. Specifically, S02: perform peak shaving on the first level and obtain the average level between two adjacent valleys. Based on this difference, the determination of value is different from the determination of peak value. The main differences between the two are in steps S022, S023, and S0222;

[0076] Specifically, step S02 includes the following specific steps:

[0077] S021: Obtain the three nearest first levels at intervals of the set duration. Specifically, the three nearest first levels refer to the three first levels closest to the current moment.

[0078] S022: Obtain the valley value. Specifically, the obtaining method of this step is as follows:

[0079] S0221: Sort the three first levels according to the acquisition time;

[0080] S0222, determine whether the first material level in the middle is the minimum value among the three; if so, take the first material level in the middle as the valley value; if not, obtain the first material level after the interval setting time. That is, the first material level in the middle is greater than the other two first material levels. This means that the first material level in the middle is the valley value.

[0081] S023, calculating the average material level between the current valley value and the previous valley value.

[0082] The above are the differences between this embodiment and Embodiment 1, and other differences can be implemented by referring to Embodiment 1.

[0083] Through the above two embodiments, the present invention obtains the average value of the first material level data between two peak values ​​or two valley values ​​and compares it with the set material level, thereby triggering the adjustment of the speed of the plate feeder. The first material level is compared with the set material level after peak clipping, which is enough to solve the problem of erroneous triggering due to obtaining the peak material level. Moreover, since the interval time from adjusting the frequency (speed) of the plate feeder to the material level feedback is very short, the control purpose can be well achieved without using fuzzy control ideas. Therefore, the present invention uses the material level data after peak clipping to directly compare and judge with the set material level to trigger the adjustment, which is simple and effective.

[0084] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. An automatic control method for the material level of a sintering ring cold unloading ore trough based on peak shaving technology, characterized in that: include, S1, obtain the first material level at each set time interval; wherein the first material level is the average value of the three most recent second material levels, and the second material level is the current ring cooling unloading trough material level collected at each set time interval; S2, obtaining a peak value of the material level according to the first material level, and calculating an average material level between two adjacent peak values; S3, adjusting the frequency of the plate feeder according to the relationship between the average material level and the preset material level; S4, repeat steps S1-S3.

2. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 1 is characterized by: Step S2 includes the following specific steps: S21, obtain the three most recent first material levels at intervals set for a certain period of time; S22, obtain peak value; S23, calculating the average material level between the current peak value and the previous peak value.

3. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 2 is characterized by: Step S22 includes, S221, sorting the three first material levels according to the acquisition time; S222, determine whether the first material level in the middle is the maximum value among the three; if so, take the first material level in the middle as the peak value; if not, obtain the first material level after the interval is set for a period of time.

4. The automatic control method of the material level of the sintering ring cold unloading trough based on the peak shaving technology according to claim 3 is characterized by: In step S222, after the first material level in the middle is determined as the peak value, The following steps are included: S223, determine whether the peak value is the first peak value after startup; if yes, obtain the first material level after the interval setting time; if no, execute step S23.

5. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 4 is characterized by: The preset material level includes a first predetermined value and a second predetermined value; The first predetermined value is greater than the second predetermined value; Obtain the average material level and compare it with the first predetermined value and the second predetermined value respectively. When the average material level is greater than the first predetermined value, the frequency of the plate feeder is increased according to the set adjustment amount; When the average material level is less than a second predetermined value, the frequency of the plate feeder is reduced according to a set adjustment amount; When the average material level is between the first predetermined value and the second predetermined value, the frequency of the apron feeder is kept unchanged.

6. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 5 is characterized by: Set the adjustment amount to 0.05 to 0.

2.

7. The automatic control method for the material level of the sintering ring cold unloading trough based on the peak shaving technology according to any one of claims 1 to 6 is characterized in that: Set the duration to between 0.5 and 2 seconds.

8. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 1 is characterized by: Step S2 is replaced by, S02, performing peak clipping processing on the first material level, and obtaining an average material level between two adjacent valley values.

9. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 8 is characterized by: Step S02 includes the following specific steps: S021, set the interval time to obtain the three most recent first material levels; S022, obtaining the valley value; S023, calculating the average material level between the current valley value and the previous valley value.

10. The automatic control method of the material level of the sintering ring cold unloading ore trough based on the peak shaving technology according to claim 8 is characterized by: Step S022 includes, S0221, sort the three first material levels according to the acquisition time; S0222, determine whether the first material level in the middle is the minimum value among the three; if so, take the first material level in the middle as the valley value; if not, obtain the first material level after the interval setting time.

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