CN114104770B - Method and system for controlling feeding rate of powder feeder - Google Patents
Method and system for controlling feeding rate of powder feeder Download PDFInfo
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- CN114104770B CN114104770B CN202111175727.XA CN202111175727A CN114104770B CN 114104770 B CN114104770 B CN 114104770B CN 202111175727 A CN202111175727 A CN 202111175727A CN 114104770 B CN114104770 B CN 114104770B
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- 239000000843 powder Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003860 storage Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 238000012935 Averaging Methods 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 description 27
- 238000005299 abrasion Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/48—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems
- B65G65/4881—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially horizontal axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/005—Control arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Abstract
The invention relates to a method for controlling the feeding rate of a powder feeder, which comprises the steps of collecting the real-time weight of a storage bin and the real-time rotating speed of the feeder; linear fitting is carried out on the weight and time of the bin in the descending section to obtain a feeding rate; curve fitting is carried out on the rotating speed and the feeding speed of the feeder, so that a feeding curve mathematical expression is obtained; receiving a feeding rate set value, carrying out interpolation calculation according to a preset first feeding curve data table to obtain a first set rotating speed of a corresponding feeder, wherein the first feeding curve data table consists of the rotating speed of the feeder and the feeding rate, and calculating according to a feeding curve mathematical expression to obtain a second set rotating speed of the corresponding feeder; judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder meets a preset condition or not; and controlling the feeder to operate at a second set rotating speed under the condition that the preset condition is met, otherwise controlling the feeder to operate at a first set rotating speed. The invention also provides a system for controlling the feeding rate of the powder feeder.
Description
Technical Field
The invention relates to the technical field of powder feeding, in particular to a method and a system for controlling the feeding rate of a powder feeder.
Background
Powder feeders are a very wide range of equipment used in the industry. One general type of powder feeders is a feeder using a rotary feeder (e.g., screw feeder, air lock feeder) that changes the feeding rate (i.e., the mass of powder fed per unit time) by adjusting the rotational speed.
In carrying out the invention, the inventors have found that at least the following problems exist in the prior art: the quantitative correspondence of feed rate to rotational speed is generally unknown, nonlinear. Moreover, the feed rate of the feeder at the same rotation speed is dynamically changed due to unavoidable abrasion of internal components of the feeder, variability of physical properties of powder (such as granularity and humidity) and the like.
Furthermore, in the case of continuous production, the bins associated with the feeder need to be periodically fed to maintain the proper level in the bins. In the prior art, a weighing device (such as CN213170459U which is a quantitative feeding bin with a weighing function) is additionally arranged for a bin matched with a feeder, so as to attempt to grasp the feeding rate by monitoring the change of the weight of the bin. However, in the feeding stage, the change of the weight signal is the comprehensive contribution of the feeding and discharging links, and the information of the discharging (feeding) cannot be extracted from the feeding signal alone, so that the feeding stage becomes a 'blind zone' of the method.
The above problems result in that in industrial production, only the experiences of operators (fuzzy correspondence between feed rate and feeder speed) can be mainly relied on to set and adjust the feeder speed, the feed rate cannot be directly mastered, the control error is large, and the automatic operation control is difficult to put into.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the present invention is directed to a method and system for controlling a feeding rate of a powder feeder.
To achieve the above object, a first aspect of the present invention provides a method for controlling a feeding rate of a powder feeder, comprising:
Collecting the real-time weight of a storage bin;
collecting the real-time rotating speed of a feeder;
the weight and time of the bin in the descending section are linearly fitted to obtain the feeding rate, wherein the descending section is a stage that the bin is fed only outwards without feeding;
Curve fitting is carried out on the rotating speed and the feeding speed of the feeder, so that a feeding curve mathematical expression is obtained;
Receiving a feeding rate set value, carrying out interpolation calculation according to a preset first feeding curve data table to obtain a first set rotating speed of a corresponding feeder, wherein the first feeding curve data table consists of the rotating speed of the feeder and the feeding rate, and calculating according to a feeding curve mathematical expression to obtain a second set rotating speed of the corresponding feeder;
judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder meets a preset condition or not;
And controlling the feeder to operate at the second set rotating speed under the condition that the preset condition is met, otherwise controlling the feeder to operate at the first set rotating speed.
According to the method for controlling the feeding rate of the powder feeder, when the feeding rate of the feeder is changed due to factors such as equipment abrasion, material characteristic change and the like, the corresponding relation between the feeding rate and the rotating speed of the feeder can be obtained again according to the operation data, and the rotating speed is automatically adjusted, so that a control program and an operator at an upper control end are not interfered by the changes, and the control and adjustment in a feeding system are not needed to be concerned.
Further, the method comprises the steps of,
The step of judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder meets the preset condition comprises the following steps:
and judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, and if so, meeting the preset condition.
Further, the change of the rotational speed of the feeder is achieved by changing the frequency of the frequency converter.
Further, the method further comprises the following steps:
And calculating the corresponding feeding rate on a plurality of discrete data points of the rotating speed of the feeder by using the fitted feeding curve mathematical expression to form a second feeding curve data table, carrying out interpolation calculation according to the second feeding curve data table to obtain a corresponding third set rotating speed of the feeder, and controlling the feeder to operate at the third set rotating speed.
In a second aspect, the present invention provides a system for controlling a feed rate of a powder feeder, comprising:
The storage bin is used for storing materials;
The weighing sensor is used for detecting the real-time weight of the storage bin;
A feeder for feeding;
the motor, the output shaft of the motor is connected with feeder, is used for driving the feeder;
The frequency converter is connected with the motor and used for adjusting the rotating speed of the motor;
The controller is respectively connected with the weighing sensor and the frequency converter;
The computer is connected with the controller and is used for receiving the data of the rotating speed and the weight, linearly fitting the weight and the time of the bin in the descending section to obtain the feeding rate, wherein the descending section is a stage that the bin is not fed and only is fed outwards, and curve fitting is carried out on the rotating speed and the feeding rate of the feeder to obtain a mathematical expression of a feeding curve;
The controller is used for obtaining a feeding rate set value from the outside, carrying out interpolation calculation according to a preset first feeding curve data table to obtain a first set frequency of a corresponding frequency converter, wherein the first feeding curve data table consists of the frequency converter frequency and the feeding rate, calculating according to a mathematical expression of a feeding curve obtained from a computer to obtain a second set frequency of the corresponding frequency converter, judging whether a difference value between the acquired maximum rotating speed of the feeder and the minimum rotating speed of the feeder meets a preset condition, controlling the frequency converter to operate at the second set frequency under the condition that the preset condition is met, and otherwise controlling the frequency converter to operate at the first set frequency.
Further, the method comprises the steps of,
The step of judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder meets the preset condition comprises the following steps:
and judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, and if so, meeting the preset condition.
Further, the feeder is a screw feeder or a single air locking valve type feeder.
Further, the automatic feeding device also comprises a discharge valve, wherein the discharge valve is arranged above the storage bin and used for controlling whether the material can enter the storage bin.
Further, the computer is further used for calculating a plurality of discrete data points of the mathematical expression of the feeding curve at the frequency of the frequency converter to obtain a corresponding feeding rate, so as to form a second feeding curve data table;
The controller is also used for carrying out interpolation calculation according to the second feeding curve data table to obtain a corresponding third set rotating speed of the feeder, and controlling the feeder to operate at the third set rotating speed.
According to the system for controlling the feeding rate of the powder feeder, when the feeding rate of the feeder is changed due to factors such as equipment abrasion, material characteristic change and the like, the corresponding relation between the feeding rate and the rotating speed of the feeder can be obtained again according to the operation data, and the rotating speed is automatically adjusted, so that a control program and an operator at an upper control end are not interfered by the changes, and the control and adjustment in the feeding system are not needed to be concerned. The system has the characteristics of self-learning, self-adapting and self-adjusting intelligent equipment to a certain extent.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a method for controlling a feed rate of a powder feeder according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for controlling the feed rate of a powder feeder according to an embodiment of the present invention;
Fig. 3 shows a plot of the weight signal of the silo of fig. 1 over time.
Fig. 4 shows raw data scatter for the feeder speed and feed rate of fig. 1.
Fig. 5 shows a feed curve obtained by polynomial fitting of the raw data in fig. 4.
Reference numerals illustrate:
the automatic feeding device comprises a discharge valve 1, a weighing sensor 2, a storage bin 3, a feeder 4, a motor 5, a frequency converter 6, a controller 7, a computer 8, a real-time rotating speed signal 11, a rotating speed setting signal 12, feeding curve data 13, a weight and rotating speed signal 14, a feeding rate setting signal 15 and a real-time weight signal 16.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. On the contrary, the embodiments of the invention include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.
FIG. 1 is a flow chart of a method for controlling a feed rate of a powder feeder according to an embodiment of the invention
Referring to fig. 1, a method of controlling a feed rate of a powder feeder includes:
Collecting the real-time weight of a storage bin;
collecting the real-time rotating speed of a feeder;
Linear fitting is carried out on the weight and time of the bin in the descending section to obtain the feeding rate, and reference is made to fig. 3, wherein the descending section is a stage that the bin is fed only outwards without feeding;
Curve fitting is carried out on the rotating speed and the feeding speed of the feeder, so that a feeding curve mathematical expression is obtained;
Receiving a feeding rate set value, carrying out interpolation calculation according to a preset first feeding curve data table to obtain a first set rotating speed of a corresponding feeder, wherein the first feeding curve data table consists of the rotating speed of the feeder and the feeding rate, and calculating according to a feeding curve mathematical expression to obtain a second set rotating speed of the corresponding feeder;
judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder meets a preset condition or not;
And controlling the feeder to operate at the second set rotating speed under the condition that the preset condition is met, otherwise controlling the feeder to operate at the first set rotating speed.
Through the steps, the feeder can be operated at an accurate rotating speed according to a feeding rate set value, so that the situation that the rotating speed of the feeder is set and regulated mainly by experience of operators (fuzzy corresponding relation between the feeding rate and the rotating speed of the feeder) in the prior art is avoided, and a novel method for controlling the feeding rate of the powder feeder is provided, and the rotating speed of the feeder is automatically regulated.
The configuration of the predetermined condition may be determined according to the actual requirement, that is, the setting of the rotational speed of the feeder may be preconfigured, and there are various ways of this configuration, and no matter what condition is configured, the condition is used to set the rotational speed of the feeder, so that the condition can be adjusted without using experience of a person in the prior art, and the problems in the prior art can be solved.
There are a number of ways of determining whether the feeder run time meets the predetermined condition, and two alternative implementations are provided in this embodiment.
In one embodiment, the determining whether the difference between the collected maximum rotational speed of the feeder and the collected minimum rotational speed of the feeder satisfies the predetermined condition may be:
And judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, and if so, meeting the preset condition.
In a short time after the feeder is put into actual operation, since enough operation data has not been accumulated to obtain actual feeding curve data, feeding curve data of factory setting will be adopted, and the first feeding curve data table adopts factory setting for calculating a feeder rotation speed target value according to a feeding rate set value.
When the acquired difference value between the maximum rotating speed of the feeder and the minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, namely, the difference value accounts for a large enough proportion of the range of 0-50 Hz, the weight and time of the bin in the descending section are linearly fitted to obtain the feeding rate, and the rotating speed and the feeding rate of the feeder are subjected to curve fitting to obtain a mathematical expression of the feeding curve, the rotating speed and the feeding rate data quantity of the feeder can meet the basic requirement. Through a plurality of descent segments, the acquired feeder speed and feed rate data volume is greater, and more representative data can be obtained.
It will be appreciated that the variation of the feeder speed is achieved by varying the frequency of the frequency converter.
Optionally, the method for controlling the feeding rate of the powder feeder further comprises:
And calculating the corresponding feeding rate on a plurality of discrete data points of the rotating speed of the feeder by using the fitted feeding curve mathematical expression to form a second feeding curve data table, carrying out interpolation calculation according to the second feeding curve data table to obtain a corresponding third set rotating speed of the feeder, and controlling the feeder to operate at the third set rotating speed.
That is, the set rotational speed of the feeder can also be obtained by interpolation calculation according to the second feeding curve data table, and the calculation is not required to be performed by adopting a mathematical expression of the feeding curve.
Referring to fig. 2, the embodiment of the invention also provides a system for controlling the feeding rate of the powder feeder, which comprises a weighing sensor 2, a stock bin 3, a feeder 4, a motor 5, a frequency converter 6, a controller 7 and a computer 8. Wherein, the storage bin 3 is used for storing materials; the weighing sensor 2 is used for detecting the real-time weight of the storage bin; a feeder 4 for feeding; a motor 5, the output shaft of which is connected with the feeder 4 and is used for driving the feeder 4; the frequency converter 6 is connected with the motor 5 and is used for adjusting the rotating speed of the motor 5; the controller 7 is respectively connected with the weighing sensor 2 and the frequency converter 6; the computer 8 is connected with the controller 7, the computer 8 is used for receiving the data of the rotating speed and the weight, and carrying out linear fitting on the weight and the time of the bin in the descending section to obtain the feeding rate, wherein the descending section is a stage that the bin is fed only outwards, and curve fitting is carried out on the rotating speed and the feeding rate of the feeder to obtain a mathematical expression of a feeding curve.
The transmission relationships of the various signals of the system of the embodiment are as follows: the feed rate setting signal 15 is externally input, the real-time weight signal 16 is transmitted from the load cell 2 to the controller 7, the real-time rotation speed signal 11 is transmitted from the frequency converter 6 to the controller 7, the weight and rotation speed signal 14 is transmitted from the controller 7 to the computer 8, the feed curve data 13 is transmitted from the computer 9 to the controller 7, and the rotation speed setting signal 12 is transmitted from the controller 7 to the frequency converter 6.
The controller 7 may be a PLC, configured to obtain a feeding rate set value from the outside, perform interpolation calculation according to a preset first feeding curve data table to obtain a first set frequency of the corresponding frequency converter, where the first feeding curve data table is composed of a frequency converter and a feeding rate, calculate to obtain a second set frequency of the corresponding frequency converter according to a mathematical expression of a feeding curve obtained from a computer, determine whether a difference between a collected maximum rotational speed of the feeder and a minimum rotational speed of the feeder meets a predetermined condition, and control the frequency converter to operate at the second set frequency if the predetermined condition is met, otherwise control the frequency converter to operate at the first set frequency.
Optionally, determining whether the feeder operation time satisfies the predetermined condition includes:
And judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, and if so, meeting the preset condition.
In some embodiments, the feeder 4 is a screw feeder or a single air lock valve feeder.
Advantageously, the system for controlling the feeding rate of the powder feeder according to the embodiment of the present invention further comprises a discharge valve 1, wherein the discharge valve 1 is installed above the bin 3, and is used for controlling whether the material can enter the bin 3.
The computer 8 is further configured to calculate a feeding rate corresponding to a mathematical expression of the feeding curve at a plurality of discrete data points of the frequency converter, so as to form a second feeding curve data table; the controller 7 is further configured to perform interpolation calculation according to the second feeding curve data table to obtain a third set rotational speed of the corresponding feeder, and control the feeder to operate at the third set rotational speed.
The feeding curve data may also be a data table formed by [ feeding speed, feeding rate ] calculated on a series of discrete numerical points of the feeding speed by a feeding curve mathematical formula, and the controller may calculate the feeding speed target value from the feeding rate set value by using an interpolation method.
The description of the above embodiment will be made with reference to a preferred embodiment.
The system for controlling the feeding rate of the powder feeder provided by the embodiment adopts a double-air locking valve type feeder, the rotating speed of a driving motor of the feeder is controlled through a frequency converter, and the working frequency range of the frequency converter is 0-50 Hz.
After the feeder is put into operation, the feeder is stably operated at the rotating speed of q 1 for a certain period of time, and a curve of the change of the weight signal along with time is illustrated as an example in fig. 3. The descending section of the curve is a stage that the discharging valve at the upper part of the bin is closed, so that the bin does not feed, and at the moment, the change (reduction) of the weight signal is completely from the outward feeding of the feeder, so that the absolute value of the slope obtained by straight line fitting of the descending section is the feeding rate corresponding to the descending section. Due to measurement errors, material characteristic fluctuation and the like, even under the condition of unchanged rotating speed, the feeding rates obtained according to the fitting method for a plurality of adjacent descending segments are not completely the same, so that the feeding rates of the plurality of descending segments are averaged to be used as the feeding rate w 1 at the rotating speed.
Referring to fig. 4, the feeder may operate at different rotational speeds for a certain period of time due to the production requirements. The above process is repeated to obtain a series of [ q i,wi ] raw data. Referring to fig. 5, the computer in the present system performs curve fitting on these operational data. Taking the feed rate as an independent variable and the rotation speed as a dependent variable, fitting by using a fourth-order polynomial as an example, and other mathematical forms can be adopted, and the fitting expression is obtained without limitation:
Where k 0 =0 (where a zero crossing of the curve is mandatory so k 0＝0),k1＝19.21503,k2＝26.64171,k3＝-39.24768,k4 = 20.36192. The computer sends an array of parameters [0.0,19.21503,26.64171, -39.24768,20.36192] to the controller, which determines the order of the polynomial based on the length of the array and sets the coefficients of the polynomial.
At a certain moment, the feeding rate setting signal received by the controller is w sd =1.2 kg/s, the controller substitutes the data into the expression to obtain a feeder rotating speed target value q js approximately 35.8Hz, and the controller transmits the value to the frequency converter to be used as the working frequency of the frequency converter.
In another preferred embodiment, the computer calculates the corresponding feed rate on a number of discrete data points of the feeder speed from the fitted feed curve mathematical expression, forms a feed curve data table, and sends the table (rather than the parameter array of the feed curve mathematical expression) to the controller.
For example, on the basis of the curve expression obtained in the above preferred embodiment, the corresponding w is calculated at some discrete points of q=0 to 50Hz, the following table is obtained, and sent to the controller.
At a certain moment, the feeding rate setting signal received by the controller is w sd =1.2 kg/s, the controller finds two adjacent points which are respectively smaller than and larger than w sd, namely (35 Hz,1.18 kg/s) and (40 Hz,1.27 kg/s), the rotation speed corresponding to w sd =1.2 kg/s is obtained by linear interpolation as q js = (1.2-1.18)/(1.27-1.18) × (40-35) +35 (-36.1 Hz) according to the feeding curve data table, and the controller transmits the values to the frequency converter to be used as the working frequency of the frequency converter.
It should be noted that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (4)
1. A method of controlling a feed rate of a powder feeder comprising:
Collecting the real-time weight of a storage bin;
collecting the real-time rotating speed of a feeder;
the weight and time of the bin in the descending section are linearly fitted to obtain the feeding rate, wherein the descending section is a stage that the bin is fed only outwards without feeding;
Curve fitting is carried out on the rotating speed and the feeding speed of the feeder, so that a feeding curve mathematical expression is obtained;
Receiving a feeding rate set value, carrying out interpolation calculation according to a preset first feeding curve data table to obtain a first set rotating speed of a corresponding feeder, wherein the first feeding curve data table consists of the rotating speed of the feeder and the feeding rate, and calculating according to a feeding curve mathematical expression to obtain a second set rotating speed of the corresponding feeder;
judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder meets a preset condition or not;
controlling the feeder to operate at a second set rotational speed when a predetermined condition is met, otherwise controlling the feeder to operate at a first set rotational speed;
the linear fitting is carried out on the weight and time of the bin in the descending section to obtain the feeding rate, and the method further comprises the following steps:
Averaging the feed rates of a plurality of adjacent descending segments to obtain a curve-fitted feed rate;
The step of judging whether the acquired difference value between the maximum rotating speed of the feeder and the minimum rotating speed of the feeder meets the preset condition comprises the following steps:
Judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, and if so, meeting the preset condition;
the change in the rotational speed of the feeder is achieved by changing the frequency of the frequency converter.
2. The method of controlling a feed rate of a powder feeder of claim 1, further comprising:
And calculating the corresponding feeding rate on a plurality of discrete data points of the rotating speed of the feeder by using the fitted feeding curve mathematical expression to form a second feeding curve data table, carrying out interpolation calculation according to the second feeding curve data table to obtain a corresponding third set rotating speed of the feeder, and controlling the feeder to operate at the third set rotating speed.
3. A system for controlling a feed rate of a powder feeder, comprising:
The storage bin (3) is used for storing materials;
the weighing sensor (2) is used for detecting the real-time weight of the storage bin;
a feeder (4) for feeding;
a motor (5), the output shaft of which is connected with the feeder (4) and is used for driving the feeder (4);
the frequency converter (6), the frequency converter (6) is connected with the motor (5), is used for adjusting the rotational speed of the motor (5);
The controller (7) is respectively connected with the weighing sensor (2) and the frequency converter (6);
The computer (8) is connected with the controller (7), the computer (8) is used for receiving the data of the rotating speed and the weight, and carrying out linear fitting on the weight and the time of the bin in the descending section to obtain the feeding rate, wherein the descending section is a stage that the bin is fed only outwards without feeding, and curve fitting is carried out on the rotating speed and the feeding rate of the feeder to obtain a mathematical expression of a feeding curve;
The controller (7) is used for obtaining a feeding rate set value from the outside, carrying out interpolation calculation according to a preset first feeding curve data table to obtain a first set frequency of a corresponding frequency converter, wherein the first feeding curve data table consists of the frequency converter frequency and the feeding rate, calculating according to a mathematical expression of a feeding curve obtained from a computer to obtain a second set frequency of the corresponding frequency converter, judging whether a difference value between the acquired maximum rotating speed of the feeder and the minimum rotating speed of the feeder meets a preset condition, controlling the frequency converter to operate at the second set frequency under the condition that the preset condition is met, otherwise controlling the frequency converter to operate at the first set frequency;
the computer (8) is further configured to:
Averaging the feed rates of a plurality of adjacent descending segments to obtain a curve-fitted feed rate;
The step of judging whether the acquired difference value between the maximum rotating speed of the feeder and the minimum rotating speed of the feeder meets the preset condition comprises the following steps:
Judging whether the difference value between the collected maximum rotating speed of the feeder and the collected minimum rotating speed of the feeder exceeds 30% of the rotating speed of the feeder when the feeder works at the frequency of 50z, and if so, meeting the preset condition;
The feeder (4) is a spiral feeder or a single air locking valve type feeder;
the automatic feeding device also comprises a discharge valve (1), wherein the discharge valve (1) is arranged above the storage bin (3) and is used for controlling whether materials can enter the storage bin (3).
4. A system for controlling a powder feeder feed rate as defined in claim 3, wherein: the computer (8) is also used for calculating a mathematical expression of the feeding curve at a plurality of discrete data points of the frequency converter to obtain a corresponding feeding rate, so as to form a second feeding curve data table;
the controller (7) is also used for carrying out interpolation calculation according to the second feeding curve data table to obtain a corresponding third set rotating speed of the feeder, and controlling the feeder to operate at the third set rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111175727.XA CN114104770B (en) | 2021-10-09 | 2021-10-09 | Method and system for controlling feeding rate of powder feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111175727.XA CN114104770B (en) | 2021-10-09 | 2021-10-09 | Method and system for controlling feeding rate of powder feeder |
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