CN111298951A - Automatic powder selection control method, system and device for vertical mill classifier - Google Patents
Automatic powder selection control method, system and device for vertical mill classifier Download PDFInfo
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- CN111298951A CN111298951A CN202010214533.5A CN202010214533A CN111298951A CN 111298951 A CN111298951 A CN 111298951A CN 202010214533 A CN202010214533 A CN 202010214533A CN 111298951 A CN111298951 A CN 111298951A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control arrangements
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Abstract
The invention provides a vertical mill classifier automatic powder selection control method, system and device, wherein the method comprises the following steps: inputting a set target air pressure value and a target powder fineness value, collecting outlet air pressure and inlet air pressure of the vertical mill classifier, calculating an air pressure difference value of the outlet air pressure and the inlet air pressure, and adjusting the running state of the fan according to the air pressure difference value and the target air pressure value; and collecting the powder granularity value, and adjusting the state of a frequency converter of the vertical mill classifier according to the powder granularity value and the target powder fineness value. The required powder granularity can be automatically obtained according to a set value, the steps of manual sampling and adjustment are reduced, in the screening process, the air pressure difference value is continuously adjusted, the state of the fan is adjusted according to the air pressure difference value and the target air pressure value, the problems that the screening and powder grinding precision of the vertical mill classifier is influenced due to deviation of air pressure and the powder discharging and feeding are unbalanced are solved, and the condition that the powder fineness screening is different and a large amount of waste is caused when products with specific indexes are debugged is avoided.
Description
Technical Field
The invention mainly relates to the technical field of screening powder particles, in particular to an automatic powder selection control method, system and device for a vertical mill classifier.
Background
Vertical milling machine is at present to being the product quality (fineness) that the screening was come, mainly through artifical adjusting classifier frequency, fan frequency converter frequency, the air door aperture is realized, to the product of a specification, need pass through: 1. manually adjusting parameters; 2. manually collecting a sample for inspection; 3. and repeating the steps if the test card is not qualified. Such operations and steps have the defects that each time of judgment is sometimes ductile, the system cannot obtain the change node of the adjusted parameter at the first time, manual operation has certain distinctiveness, and personnel with different operation experiences have different effects when adjusting the parameter, so that a large amount of waste is caused when equipment is used for debugging products with specific indexes.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides an automatic powder selection control method, system and device for a vertical mill classifier.
The technical scheme for solving the technical problems is as follows: an automatic powder selection control method of a vertical mill classifier comprises the following steps:
inputting a set target wind pressure value and a set target powder fineness value;
collecting outlet wind pressure and inlet wind pressure of a vertical mill classifier, calculating a wind pressure difference value of the outlet wind pressure and the inlet wind pressure, and adjusting the running state of a fan according to the wind pressure difference value and the target wind pressure value;
and collecting the powder granularity value, and adjusting the running state of the frequency converter of the vertical mill classifier according to the collected powder granularity value and the target powder fineness value.
Another technical solution of the present invention for solving the above technical problems is as follows: an automatic powder selection control system of a vertical mill classifier comprises a touch screen, a vertical mill classifier, acquisition equipment, a fan and a control device, wherein the control device executes the automatic quality inspection method of the classifier, and the touch screen, the vertical mill classifier, the acquisition equipment and the fan are respectively connected with the control device;
the touch screen is used for allowing a user to input a set target wind pressure value and a set target powder fineness value;
the vertical mill classifier is used for grinding a target product to obtain powder;
the collecting equipment is used for collecting outlet air pressure, inlet air pressure and powder granularity value of the vertical mill classifier;
and the fan is used for providing air volume for the grinding bin of the vertical mill classifier.
Another technical solution of the present invention for solving the above technical problems is as follows: an automatic powder selecting control device of a vertical mill classifier comprises:
the input module is used for inputting a set target wind pressure value and a set target powder fineness value;
the air pressure adjusting module is used for acquiring outlet air pressure and inlet air pressure of the vertical mill classifier, calculating an air pressure difference value of the outlet air pressure and the inlet air pressure, and adjusting the running state of the fan according to the air pressure difference value and the target air pressure value;
and the particle size adjusting module is used for collecting the powder particle size value and adjusting the running state of the frequency converter of the vertical mill classifier according to the collected powder particle size value and the powder fineness target value.
The invention has the beneficial effects that: the required powder granularity can be automatically output according to a set value, the steps of manual sampling and adjustment are reduced, in the screening process, the air pressure difference value is continuously adjusted, the running state of the fan is adjusted according to the air pressure difference value and the target air pressure value, the problems that the air pressure deviation occurs to influence the screening and powder grinding precision of the vertical mill classifier and the powder discharging and feeding are unbalanced are solved, and the condition that the powder fineness screening is different and a large amount of waste is caused when products with specific indexes are debugged is avoided.
Drawings
Fig. 1 is a schematic flow chart of an automatic powder selection control method for a vertical mill classifier according to an embodiment of the present invention;
FIG. 2 is a control schematic diagram of an automatic powder selection control method of a vertical mill classifier according to an embodiment of the present invention;
fig. 3 is a block diagram of an automatic powder selection control system of a vertical mill classifier according to an embodiment of the present invention;
fig. 4 is a block diagram of an automatic powder selection control device of a vertical mill classifier according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic flow chart of an automatic powder selection control method for a vertical mill classifier according to an embodiment of the present invention.
As shown in fig. 1, an automatic powder selection control method for a vertical mill classifier includes:
inputting a set target wind pressure value and a set target powder fineness value;
collecting outlet wind pressure and inlet wind pressure of a vertical mill classifier, calculating a wind pressure difference value of the outlet wind pressure and the inlet wind pressure, and adjusting the running state of a fan according to the wind pressure difference value and the target wind pressure value;
and collecting the powder granularity value, and adjusting the running state of the frequency converter of the vertical mill classifier according to the collected powder granularity value and the target powder fineness value.
In the above embodiment, can go out required powder granularity according to the setting value is automatic, reduce the step of artifical sampling and regulation, and in the screening process, the continuous adjustment wind pressure difference value, according to the running state of wind pressure difference value and target wind pressure value adjustment fan, overcome the wind pressure and appeared the deviation and influence the precision that immediately grinds the grader screening and grind the powder to and the unbalanced problem of powder ejection of compact and feeding, avoided the powder fineness to screen the condition of discordance and caused the extravagant condition in a large number when debugging the product of specific index.
Fig. 2 is a control schematic diagram of an automatic powder selection control method of a vertical mill classifier according to an embodiment of the present invention.
Optionally, as an embodiment of the present invention, as shown in fig. 2, the process of adjusting the operation state of the fan according to the current wind pressure difference value and the target wind pressure difference value includes:
if the wind pressure difference value is smaller than the target wind pressure value, a first instruction for improving the fan frequency and the opening degree of the air door actuator is generated, if the wind pressure difference value is larger than the target wind pressure value, a second instruction for reducing the fan frequency and the opening degree of the air door actuator is generated, and the running state of the fan is adjusted according to the first instruction or the second instruction.
It should be understood that the air pressure difference value and the mill pressure difference are the difference value of the mill inlet air pressure and the mill outlet air pressure, and reflect the resistance in the mill cavity, i.e. the dust concentration in the mill cavity. If certain fineness is ensured (the frequency of the classifier is certain, namely the frequency of the fan, and the opening degree of an air door at the inlet of the fan is a fixed value), the parameters are determined by the frequency of the fan, namely the frequency of the fan is increased, and the pressure difference of the mill is reduced; the fan frequency decreases and the mill pressure differential increases.
In the embodiment, if only the rotating speed control fineness of the classifier is adjusted, deviation of the air conveying system is likely to occur, the main reason of the deviation is that the dust concentration in the grinding cavity is influenced (after the classifier is adjusted, the pressure difference in the mill gradually deviates to another value under the condition of certain air volume), and then the discharging and feeding of the whole system are unbalanced, so that the effect of grinding (screening) powder is finally influenced.
Fig. 2 is a control schematic diagram of an automatic powder selection control method of a vertical mill classifier according to an embodiment of the present invention.
Optionally, as an embodiment of the present invention, as shown in fig. 2, the process of adjusting the operation state of the frequency converter of the vertical mill classifier according to the collected powder particle size value and the powder fineness target value includes:
in a preset period, acquiring the powder granularity value n times according to preset acquisition times n, calculating the average value of the powder granularity value n times to obtain a powder granularity average value, judging whether the powder granularity average value is equal to the powder fineness target value, if not, generating a third instruction for improving the frequency or the rotating speed of the frequency converter of the vertical mill classifier, and adjusting the running state of the frequency converter of the vertical mill classifier according to the third instruction.
Specifically, the preset period is to sample every 10 minutes. The preset collection times n are 10 times.
It should be understood that the frequency or the rotating speed of the vertical mill classifier influences the fineness of the final powder product, the higher the frequency of the frequency converter of the classifier is, the finer the fineness of the powder is, and under the condition of a certain air quantity (the frequency of a fan and the opening degree of an air door at the inlet of the fan are constant values), the pressure difference of the mill can be increased; on the contrary, the thicker the powder fineness is, the lower the mill pressure difference is at a certain air flow rate.
In the above embodiment, the calculated average particle size of the powder is compared with the target fineness of the powder, and the third instruction for increasing the frequency or the rotation speed of the frequency converter of the vertical mill classifier is obtained according to the comparison result, so that the frequency is increased to grind and thin the powder again.
Optionally, as an embodiment of the present invention, the method further includes the steps of:
generating a starting signal for starting the vertical mill classifier and the fan according to the input target wind pressure value;
and when no powder is monitored to be present at the discharge port of the vertical mill classifier, generating a closing signal for closing the vertical mill classifier and the fan.
Specifically, the measurement may be carried out using a powder particle size measuring apparatus of the type ST-1076.
In the above embodiment, unattended operation and automatic screening of the grinding powder can be realized.
Fig. 3 is a block diagram of an automatic powder selection control system of a vertical mill classifier according to an embodiment of the present invention.
Optionally, as another embodiment of the present invention, as shown in fig. 3, an automatic powder selection control system for a vertical mill classifier includes a touch screen, a vertical mill classifier, a collection device, a fan, and a control device, where the control device executes the above-mentioned automatic quality inspection method for the classifier, and the touch screen, the vertical mill classifier, the collection device, and the fan are respectively connected to the control device;
the touch screen is used for allowing a user to input a set target wind pressure value and a set target powder fineness value;
the vertical mill classifier is used for grinding a target product to obtain powder;
the collecting equipment is used for collecting outlet air pressure, inlet air pressure and powder granularity value of the vertical mill classifier;
and the fan is used for providing air volume for the grinding bin of the vertical mill classifier.
In particular, the collection device comprises a powder detector, which may be a powder monitor of the type ST-1076. The signal for feeding back the fineness of the powder can adopt a 4-20mA analog quantity signal or Modbus-TCP communication transmission information.
Specifically, the collecting device further comprises two airflow negative pressure meters, one airflow negative pressure meter is arranged at the negative pressure section of the inlet pipeline of the mill, and the other airflow negative pressure meter is arranged at the outlet of the classifier and used for detecting the pressure difference of the mill.
Fig. 4 is a block diagram of an automatic powder selection control device of a vertical mill classifier according to an embodiment of the present invention.
Alternatively, as another embodiment of the present invention, as shown in fig. 4, an automatic powder selecting control device for a vertical mill classifier includes:
the input module is used for inputting a set target wind pressure value and a set target powder fineness value;
the air pressure adjusting module is used for acquiring outlet air pressure and inlet air pressure of the vertical mill classifier, calculating an air pressure difference value of the outlet air pressure and the inlet air pressure, and adjusting the running state of the fan according to the air pressure difference value and the target air pressure value;
and the particle size adjusting module is used for collecting the powder particle size value and adjusting the running state of the frequency converter of the vertical mill classifier according to the collected powder particle size value and the powder fineness target value.
Optionally, as an embodiment of the present invention, the wind pressure adjusting module is specifically configured to:
if the wind pressure difference value is smaller than the target wind pressure value, a first instruction for improving the fan frequency and the opening degree of the air door actuator is generated, if the wind pressure difference value is larger than the target wind pressure value, a second instruction for reducing the fan frequency and the opening degree of the air door actuator is generated, and the running state of the fan is adjusted according to the first instruction or the second instruction.
The system belongs to a double-PID control closed-loop system, namely a granularity adjusting module is a main PID system, and a wind pressure adjusting module is an auxiliary PID system. The input quantity of the main PID system is a fineness value (a target value of a qualified product), the process quantity is frequency adjustment of the classifier, and the feedback value is a real-time fineness value (obtained by sampling analysis of a particle analyzer); the input quantity of the auxiliary PID system is a mill pressure difference value, the process quantity is fan frequency adjustment and air door actuator opening degree adjustment, and the feedback value is a real-time mill pressure difference value (difference between measured values of two negative pressure meters). The main PID system is responsible for keeping qualified fineness of products, and the auxiliary PID system is used for stabilizing the mill system to prevent the main PID system from deviating too much in adjustment.
Optionally, as an embodiment of the present invention, the granularity adjusting module is specifically configured to:
in a preset period, acquiring the powder granularity value n times according to preset acquisition times n, calculating the average value of the powder granularity value n times to obtain a powder granularity average value, judging whether the powder granularity average value is equal to the powder fineness target value, if not, generating a third instruction for improving the frequency or the rotating speed of the frequency converter of the vertical mill classifier, and adjusting the running state of the frequency converter of the vertical mill classifier according to the third instruction.
Optionally, as an embodiment of the present invention, the system further includes an on-off control module, configured to:
generating a starting signal for starting the vertical mill classifier and the fan according to the input target wind pressure value;
and the device is also used for generating a closing signal for closing the vertical mill classifier and the fan when no powder is detected at the discharge port of the vertical mill classifier.
The invention can automatically obtain the required powder granularity according to a set value, reduces the steps of manual sampling and adjustment, continuously adjusts the air pressure difference value in the screening process, adjusts the running state of the fan according to the air pressure difference value and the target air pressure value, overcomes the problems that the screening and powder grinding precision of the vertical mill classifier is influenced by the deviation of air pressure and the powder discharging and feeding are unbalanced, and avoids the condition of inconsistent powder fineness screening and the condition of great waste in the process of debugging products with specific indexes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An automatic powder selection control method of a vertical mill classifier is characterized by comprising the following steps:
inputting a set target wind pressure value and a set target powder fineness value;
collecting outlet wind pressure and inlet wind pressure of a vertical mill classifier, calculating a wind pressure difference value of the outlet wind pressure and the inlet wind pressure, and adjusting the running state of a fan according to the wind pressure difference value and the target wind pressure value;
and collecting the powder granularity value, and adjusting the running state of the frequency converter of the vertical mill classifier according to the collected powder granularity value and the target powder fineness value.
2. The automatic powder selection control method of the vertical mill classifier according to claim 1, wherein the process of adjusting the operation state of the fan according to the current air pressure difference value and the target air pressure difference value comprises:
if the wind pressure difference value is smaller than the target wind pressure value, a first instruction for improving the fan frequency and the opening degree of the air door actuator is generated, if the wind pressure difference value is larger than the target wind pressure value, a second instruction for reducing the fan frequency and the opening degree of the air door actuator is generated, and the running state of the fan is adjusted according to the first instruction or the second instruction.
3. The automatic powder selection control method of the vertical mill classifier according to claim 2, wherein the process of adjusting the operation state of the vertical mill classifier frequency converter according to the collected powder granularity value and the powder fineness target value comprises:
in a preset period, acquiring the powder granularity value n times according to preset acquisition times n, calculating the average value of the powder granularity value n times to obtain a powder granularity average value, judging whether the powder granularity average value is equal to the powder fineness target value, if not, generating a third instruction for improving the frequency or the rotating speed of the frequency converter of the vertical mill classifier, and adjusting the running state of the frequency converter of the vertical mill classifier according to the third instruction.
4. The automatic powder selection control method of a vertical mill classifier according to any one of claims 1 to 3, characterized by further comprising the steps of:
generating a starting signal for starting a vertical mill classifier and a fan according to the input target wind pressure value;
and when no powder is monitored to be present at the discharge port of the vertical mill classifier, generating a closing signal for closing the vertical mill classifier and the fan.
5. An automatic powder selection control system of a vertical mill classifier comprises a touch screen, a vertical mill classifier, a collection device, a fan and a control device, and is characterized in that the control device executes the automatic quality inspection method of the classifier according to claims 1 to 4, and the touch screen, the vertical mill classifier, the collection device and the fan are respectively connected with the control device;
the touch screen is used for allowing a user to input a set target wind pressure value and a set target powder fineness value;
the vertical mill classifier is used for grinding a target product to obtain powder;
the collecting equipment is used for collecting outlet air pressure, inlet air pressure and powder granularity value of the vertical mill classifier;
and the fan is used for providing air volume for the grinding bin of the vertical mill classifier.
6. The utility model provides a vertical mill grader automatic selection powder controlling means which characterized in that includes:
the input module is used for inputting a set target wind pressure value and a set target powder fineness value;
the air pressure adjusting module is used for acquiring outlet air pressure and inlet air pressure of the vertical mill classifier, calculating an air pressure difference value of the outlet air pressure and the inlet air pressure, and adjusting the running state of the fan according to the air pressure difference value and the target air pressure value;
and the particle size adjusting module is used for collecting the powder particle size value and adjusting the running state of the frequency converter of the vertical mill classifier according to the collected powder particle size value and the powder fineness target value.
7. The automatic powder selection control device of the vertical mill classifier according to claim 6, wherein the air pressure adjusting module is specifically configured to:
if the wind pressure difference value is smaller than the target wind pressure value, a first instruction for improving the fan frequency and the opening degree of the air door actuator is generated, if the wind pressure difference value is larger than the target wind pressure value, a second instruction for reducing the fan frequency and the opening degree of the air door actuator is generated, and the running state of the fan is adjusted according to the first instruction or the second instruction.
8. The automatic powder selection control device of the vertical mill classifier according to claim 7, wherein the particle size adjusting module is specifically configured to:
in a preset period, acquiring the powder granularity value n times according to preset acquisition times n, calculating the average value of the powder granularity value n times to obtain a powder granularity average value, judging whether the powder granularity average value is equal to the powder fineness target value, if not, generating a third instruction for improving the frequency or the rotating speed of the frequency converter of the vertical mill classifier, and adjusting the running state of the frequency converter of the vertical mill classifier according to the third instruction.
9. The automatic powder selection control device of the vertical mill classifier according to any one of claims 6 to 8, further comprising an on-off control module for:
generating a starting signal for starting the vertical mill classifier and the fan according to the input target wind pressure value;
and the device is also used for generating a closing signal for closing the vertical mill classifier and the fan when no powder is detected at the discharge port of the vertical mill classifier.
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| CN114377842A (en) * | 2021-12-27 | 2022-04-22 | 江苏丰尚智能科技有限公司 | Material fineness adjusting method and device, computer equipment and storage medium |
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