CN114471350B - Metering control method, metering control device, metering system and stirring station - Google Patents
Metering control method, metering control device, metering system and stirring station Download PDFInfo
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- CN114471350B CN114471350B CN202111673043.2A CN202111673043A CN114471350B CN 114471350 B CN114471350 B CN 114471350B CN 202111673043 A CN202111673043 A CN 202111673043A CN 114471350 B CN114471350 B CN 114471350B
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000003756 stirring Methods 0.000 title abstract description 8
- 238000005303 weighing Methods 0.000 claims abstract description 219
- 239000000463 material Substances 0.000 claims abstract description 129
- 238000012937 correction Methods 0.000 claims description 24
- 230000000087 stabilizing effect Effects 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 21
- 230000001105 regulatory effect Effects 0.000 description 14
- 239000000843 powder Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000004590 computer program Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
- G01G13/02—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism
- G01G13/04—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism involving dribble-feed means controlled by the weighing mechanism to top up the receptacle to the target weight
- G01G13/10—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism involving dribble-feed means controlled by the weighing mechanism to top up the receptacle to the target weight wherein the main feed is effected by pneumatic conveying means, e.g. by fluidised feed of granular material
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- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Abstract
The invention provides a metering control method, a metering control device, a metering system and a stirring station, and relates to the technical field of material conveying metering. The metering control method comprises the following steps: acquiring a weighing value of a material in a metering hopper; when the weighing value is larger than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device; wherein the material is conveyed to the measuring hopper through the pneumatic conveying device. According to the metering control method, the metering control device, the metering system and the stirring station, when the weighing value is greater than or equal to the first weighing value, the air quantity adjusting piece is controlled to adjust the conveying air quantity of the pneumatic conveying device, the conveying speed of materials is reduced, the phenomenon that the weight of the materials in the metering hopper deviates too much from the target weighing value due to rapid conveying of the materials is avoided, and the metering precision is improved.
Description
Technical Field
The invention relates to the technical field of material conveying and metering, in particular to a metering control method, a metering device, a metering system and a stirring station.
Background
In a stirring station for conveying materials through a pneumatic conveying device, the weight of the materials is weighed by means of a weighing sensor in a weighing hopper after the materials enter the weighing hopper, so that the weighing value of the materials in the weighing hopper is controlled to reach a preset target weighing value. Throughout the metering process, it is generally desirable to obtain a final weighing value that is close to the target weighing value, but there is typically a large deviation between the final weighing value of the material in the metering hopper and the target weighing value after the feed valve is closed.
At present, a common deviation reducing mode is to set a drop value, close the feed valve in time according to the drop value, and prevent the feed valve from falling into the weighing hopper during closing from affecting the metering precision.
Disclosure of Invention
The invention provides a metering control method, a metering control device, a metering system and a stirring station, which are used for solving the defect of low metering precision of materials in a metering hopper in the prior art.
The invention provides a metering control method, which comprises the following steps:
acquiring a weighing value of a material in a metering hopper;
when the weighing value is larger than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device;
wherein the material is conveyed to the measuring hopper through the pneumatic conveying device.
According to the metering control method provided by the invention, after the air quantity control part adjusts the air quantity of the pneumatic conveying device, the metering control method further comprises the following steps:
acquiring a weighing value of the material in the metering hopper, and determining a drop value based on the weighing value of the material in the metering hopper, wherein the drop value represents the weight of the material falling into the metering hopper in the closing process of the feed valve;
controlling the feed valve to close based on a target nominal value and the drop value;
wherein, the feed valve is used for controlling the break-make of the feed channel of the weighing hopper.
According to the metering control method provided by the invention, the steps of obtaining the weighing value of the material in the metering hopper and determining the drop value based on the weighing value of the material in the metering hopper comprise the steps of;
acquiring the weighing values of the materials in the metering hopper at intervals, and determining the average conveying quantity of the materials based on the weighing values acquired at intervals and the interval time;
the drop value is determined based on the average conveying amount.
According to the metering control method provided by the invention, the step value determining based on the average conveying amount comprises the following steps:
and determining the drop value based on the average conveying amount, the closing time length of the feed valve and the correction coefficient.
According to the metering control method provided by the invention, after the feeding valve is controlled to be closed based on the target nominal value and the drop value, the metering control method further comprises the following steps:
acquiring a weighing value of the material in the metering hopper to obtain a final weighing value of the material;
and adjusting the correction coefficient based on the final weighing value and the target weighing value.
According to the metering control method provided by the invention, after the feeding valve is controlled to be closed based on the target nominal magnitude and the drop value, the metering control method further comprises the following steps:
acquiring a weighing value of the material in the metering hopper to obtain a final weighing value of the material;
and adjusting the air quantity threshold value based on the final weighing value and the target weighing value.
The invention also provides a metering control device, comprising:
the acquisition unit is used for acquiring a weighing value of the material in the metering hopper;
the control unit is used for controlling the air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device when the weighing value is larger than or equal to a first weighing threshold value;
wherein the material is conveyed to the measuring hopper through the pneumatic conveying device. The invention also provides a metering system which comprises a pneumatic conveying device, a metering hopper, an air quantity adjusting piece and a control device;
the output end of the pneumatic conveying device is connected with the feeding channel of the weighing hopper, and the pneumatic conveying device is used for conveying materials to the weighing hopper;
the air quantity adjusting piece is arranged on the pneumatic conveying device and used for adjusting the conveying air quantity of the pneumatic conveying device;
the measuring hopper and the air quantity adjusting piece are respectively in communication connection with the control device, and the control device is the measuring control device.
The metering system provided by the invention further comprises a pressure stabilizing valve, wherein the pressure stabilizing valve is arranged on the pneumatic conveying device and is used for stabilizing the conveying air pressure of the pneumatic conveying device.
According to the metering system provided by the invention, the pneumatic conveying device is provided with an air inlet channel;
the air quantity adjusting part and the pressure stabilizing valve are both arranged in the air inlet channel, the air quantity adjusting part is positioned at the downstream of the air inlet channel, and the pressure stabilizing valve is positioned at the upstream of the air inlet channel.
According to the metering system provided by the invention, the pneumatic conveying device comprises a plurality of sections of connected air tanks, each section of air tank is provided with an air inlet channel, and the air inlet channel of each section of air tank is provided with the air quantity regulating piece and the pressure stabilizing valve.
According to the metering system provided by the invention, the air quantity adjusting piece is a flow control valve or an air quantity adjustable fan.
The invention also provides a mixing station comprising a metering system as described above.
According to the metering control method, the metering control device, the metering system and the stirring station, when the weighing value is greater than or equal to the first weighing value, the air quantity adjusting piece is controlled to adjust the conveying air quantity of the pneumatic conveying device, the conveying speed of materials is reduced, the phenomenon that the weight of the materials in the metering hopper deviates too much from the target weighing value due to rapid conveying of the materials is avoided, and the metering precision is improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is one of the flow chart intents of the metering control method provided by the present invention;
FIG. 2 is a second schematic flow chart diagram of the metering control method according to the present invention;
FIG. 3 is a third schematic flow chart of the metering control method according to the present invention;
FIG. 4 is a flow chart diagram of a metering control method provided by the present invention;
FIG. 5 is a flow chart diagram of a metering control method provided by the present invention;
FIG. 6 is a schematic diagram of a metering control device according to the present invention;
FIG. 7 is a schematic diagram of a metering system provided by the present invention;
fig. 8 is a schematic structural diagram of an electronic device provided by the present invention;
reference numerals:
10: a powder tank; 11: a feed opening; 20: pneumatic conveying device; 21: an air inlet channel; 30: a weighing hopper; 40: a weighing sensor; 50: a feed valve; 51: a first feed valve; 52: a second feed valve; 60: a pressure stabilizing valve; 70: a flow control valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The metering control method of the present invention is described below with reference to fig. 1 to 3.
FIG. 1 is one of the flow charts of the metering control method provided by the present invention. As shown in fig. 1, the metering control method includes:
step 110, obtaining a weighing value of the material in the metering hopper;
step 120, when the weighing value is greater than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity delivered by the pneumatic conveying device;
wherein, the material is carried to the measuring hopper through the pneumatic conveying device.
The weighing hopper comprises a hopper body and a weighing sensor arranged in the hopper body, wherein the weighing sensor is used for collecting the weight of materials in the hopper body, namely, the weighing value of the materials in the hopper is measured.
The first weighing threshold is set manually or automatically calculated from a manually set percentage. For example, at the beginning of the measurement, the user sets the target nominal value and sets the first weighing threshold, which is typically 75% -90% of the target nominal value, such as 80% or 85% of the target nominal value, although the first weighing threshold may be other values outside the above range. Alternatively, at the beginning of the metering, the user sets the target value and percentage, and takes the product of the target value and percentage as the first weighing threshold.
When the weighing value is greater than or equal to the first weighing value, the air quantity adjusting piece can adjust the air quantity to be less than the air quantity threshold value or adjust the air quantity in real time. The conveying of the materials in the metering hopper is divided into a first stage when the first weighing threshold is not reached and a second stage when the first weighing threshold is reached. In a specific embodiment, an air volume threshold is manually preset, when the weighing value is greater than or equal to a first weighing value, the air volume adjusting part is controlled to reduce the air volume to the air volume threshold, then the feeding is continuously carried out in the measuring hopper under the air volume threshold until the weight of the material in the measuring hopper reaches the target weighing value, and the feeding valve is closed. In the embodiment, in the first stage, the air conveying quantity of the pneumatic conveying device is large, the blanking is fast, the weight of materials in the metering hopper is fast increased, and the conveying efficiency is improved. In the second stage, the air quantity of the pneumatic conveying device is reduced to an air quantity threshold value, the blanking speed is reduced, and the blanking speed of the material when the target quantity value is close to the target quantity value is controlled, so that the problem that the weight deviation of the material in the metering hopper is large due to too fast blanking is avoided. In a further specific embodiment, the air volume threshold is preset manually, when the weighing value is greater than or equal to the first weighing value, the air volume adjusting part is controlled to adjust the conveying air volume in real time, and when the current weighing value of the materials in the metering hopper is greater than or equal to the target weighing value, the feeding valve is controlled to be closed. When the device is in the first stage, the air quantity of the pneumatic conveying device is large, and the discharging is fast; in the second stage, the air quantity of the pneumatic conveying device is continuously reduced, the blanking speed is gradually reduced, and the weight of the final material is ensured not to deviate from the nominal value too much.
According to the metering control method provided by the embodiment of the invention, when the weighing value is greater than or equal to the first weighing value, the air quantity adjusting part is controlled to adjust the conveying air quantity of the pneumatic conveying device, so that the conveying speed of materials is reduced, the phenomenon that the weight of the materials in the metering hopper deviates too much from the target weighing value due to rapid conveying of the materials is avoided, and the metering precision is improved.
The control air quantity adjusting part adjusts the air quantity of the pneumatic conveying device, which comprises the following steps:
controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device to an air quantity threshold value;
FIG. 2 is a second flowchart of the metering control method according to the present invention. As shown in fig. 2, after controlling the air volume adjusting member to adjust the air volume delivered by the air delivery device, the air delivery device further comprises:
step 210, obtaining a weighing value of the material in the metering hopper, and determining a drop value based on the weighing value of the material in the metering hopper, wherein the drop value represents the weight of the material falling into the metering hopper in the closing process of the feed valve;
and 220, controlling the feed valve to be closed based on the nominal target value and the drop value.
Wherein, the feed valve is used for controlling the break-make of the feed channel of weighing hopper.
The time period required for the feed valve closing process is relatively fixed, typically within 10S. In the closing process of the feed valve, the materials can still be conveyed into the metering hopper, so that excessive materials in the metering hopper are easy to cause. For this purpose, after the air supply quantity has been reduced, a drop value is determined on the basis of the weighing value of the material in the metering hopper. For example, according to the weighing value of the material in the metering hopper, the flow rate of the material in unit time is determined, and then the flow rate is multiplied by the time required for closing the feed valve to obtain a falling value. When the difference value between the weighing value and the target value of the material in the measuring hopper is smaller than or equal to the falling difference value, the feeding valve is controlled to be closed, and the material is stopped being conveyed into the measuring hopper.
According to the metering control method provided by the embodiment of the invention, the feeding valve is closed in advance according to the falling value and the target weighing value, so that the final weighing value is too much beyond the target weighing value due to the fact that the feeding valve is closed and materials entering the weighing hopper in the process of closing the feeding valve is ensured.
In one embodiment of the present invention, as shown in fig. 3, obtaining a weighted value of the material in the weighing hopper, and determining the drop value based on the weighted value of the material in the weighing hopper includes:
step 310, acquiring the weighing value of the materials in the metering hopper at intervals, determining the average conveying quantity of the materials based on the weighing value acquired at intervals and the interval time,
step 320, determining a drop value based on the average conveying amount.
In this embodiment, the air volume to be delivered is reduced to an air volume threshold value, which is set in advance by the user. In the process of conveying materials by the pneumatic conveying device, the air quantity and the pressure are fluctuated, and the material flow quantity is greatly different and is not uniformly conveyed under the same air quantity and pressure. The air quantity is regulated by the air quantity regulating part, and the air quantity is stably provided according to the air quantity threshold value, wherein the average air quantity is used for reflecting the average blanking speed of materials in the process that the air quantity is the air quantity threshold value, and the average air quantity is the weight of the materials falling into the measuring hopper in unit time after the air quantity regulating part regulates the air quantity to be smaller than the air quantity threshold value.
In one embodiment, the weighing values of the materials in the metering hopper are obtained once at preset intervals, the blanking amount of the powder in the preset time is determined according to the difference value of the two adjacent weighing values, and the average conveying amount of the powder is determined based on the difference value of the two adjacent weighing values and the preset interval time. Specifically, the average conveying amount of the powder in the preset time can be determined by dividing the difference value of the adjacent two weighing values by the preset time. For example, a weighing value is obtained at each preset time interval, more than three times of weighing values are obtained in total, the blanking speed of the materials in each preset time is calculated, and then the average conveying amount is determined by calculating the average value, so that the calculation accuracy of the average conveying amount is improved. In another alternative embodiment, the interval time between two adjacent weighing values is unequal, and the blanking speed of the powder in the interval time is determined according to the difference value of the two adjacent weighing values, so that the average conveying quantity of the materials in a plurality of time intervals is determined. The specific algorithm is similar to that of the previous embodiment, and will not be described again.
In an alternative embodiment of the invention, determining the drop value based on the average conveying amount includes:
the drop value is determined based on the average delivery amount, the closing time period of the feed valve, and the correction coefficient.
The closing time period of the feed valve is a time period required from when the feed valve receives a closing instruction to start closing to when the feed valve closes to stop feeding into the hopper.
Specifically, the landing value is determined based on the formula g=v×t×α.
Wherein G is a drop value, V is an average flow, T is a closing time of the feed valve, and alpha is a correction coefficient.
In one embodiment, the correction factor is preset by the user to be a constant value. In yet another alternative embodiment, the correction factors may be updated automatically. Specifically, as shown in fig. 4, after controlling the feed valve to close based on the target nominal value and the drop value, it further includes:
step 410, obtaining a weighing value of the material in the metering hopper to obtain a final weighing value of the material;
step 420, adjusting the correction factor based on the final weighing value and the target weighing value.
Specifically, after the feeding valve is closed, a weighing value of the material in the metering hopper is obtained, a final weighing value of the material is obtained, and if the final weighing value is smaller than a target weighing value, the correction coefficient is increased; if the final weighing value is larger than the target weighing value, reducing the correction coefficient; if the target nominal magnitude is equal, the correction factor remains unchanged. In general, the final weighing value is considered to reach the target nominal value within a certain error range, and therefore, when the final weighing value is lower than the minimum value within the allowable error range of the target weighing value, the correction coefficient is increased. And when the final weighing value is higher than the maximum value within the allowable error range of the target weighing value, the correction coefficient is reduced. If the final weighing value is within the allowable error range of the target weighing value, the correction coefficient is not adjusted.
For example, the correction coefficient preset in advance is 0.5, the nominal mesh value is 300kg, the first weighing threshold value is 240kg, and when the weighing value of the material in the metering hopper is more than or equal to 240kg, the air quantity adjusting part adjusts the air quantity delivered by the pneumatic conveying device. The drop value was 10kg based on the average transport amount, and when the weight of the powder in the hopper 30 reached 290kg, the feed valve was closed to stop feeding the powder into the hopper. After the control valve is closed, if the final weighing value of the powder in the weighing hopper 30 is 315kg, the correction coefficient is reduced, and the correction coefficient can be adjusted to be 0.4 or 0.45, so that the falling difference value is reduced. If the final weighing value of the material in the hopper 30 is smaller than the target weighing value, the correction coefficient is increased. And after each operation is finished, the correction coefficient is adjusted according to the relative size relation between the final weighing value and the target nominal value each time. It will be appreciated that the correction factor is kept unchanged if the difference between the final and target nominal values is within the allowable range.
The correction coefficient can be adjusted each time to divide gears according to the difference between the final weighing value and the target weighing value, for example, the difference is within 10kg, the preset coefficient is adjusted to be larger or smaller by 0.1, if the difference is within 6kg, the correction coefficient can be adjusted each time to be larger or smaller by 0.05, and a plurality of gears can be divided according to experience. Of course, the correction factor may be increased or decreased by a fixed value each time.
In one embodiment of the present invention, controlling the feed valve to close based on the nominal target value and the drop value specifically comprises:
and when the difference value between the weighing value of the material in the metering hopper and the target weighing value is smaller than or equal to the falling difference value, controlling the feed valve to be closed.
Based on the calculated drop value, the feed valve is closed in advance, and the difference between the weighing value of the material in the metering hopper and the target weighing value is supplemented by the material falling in the closing process of the feed valve.
In an alternative embodiment, the hopper has a plurality of feed channels, each of which is fitted with a feed valve. When the weighing value of the material in the measuring hopper is larger than or equal to a first weighing threshold value, the control part feeding valve is closed, so that the feeding speed in the measuring hopper is reduced. When the difference value between the boring current weighing value and the target weighing value in the weighing hopper is smaller than or equal to the falling difference value, all other feeding valves are controlled to be closed, and the weighing hopper stops feeding.
Therefore, the feeding valves on the plurality of feeding channels arranged on the weighing hopper are closed in stages, and when the weighing value of the materials in the weighing hopper is smaller than a first weighing threshold value, all the feeding valves are opened so as to feed rapidly; when the weighing value of the materials in the feeding hopper reaches a first weighing threshold value, closing part of the feeding valves, and reducing the feeding caliber of the feeding pipeline. It can be understood that the feeding valve can also be a valve body with adjustable caliber, and when the weighing value of the material in the metering hopper is smaller than the first weighing threshold value, the feeding valve is fully opened, and the feeding is carried out with large caliber; when the weighing value of the material in the metering hopper is larger than or equal to a first weighing threshold value, the feeding valve is half opened, and the feeding caliber is reduced. The specific control strategy is determined according to the setting of the feed valve and the setting of the feed pipeline, and the specific control strategy is determined only if the opening of the feed valve is larger than the opening of the feed valve when the first weighing threshold is not reached or the opening quantity of the feed valve is larger than the opening quantity of the feed valve when the first weighing threshold is not reached.
In an alternative embodiment, as shown in fig. 5, controlling the feed valve to close based on the target nominal value and the drop value further comprises:
step 510, obtaining a weighing value of the material in the metering hopper, and obtaining a final weighing value of the material;
step 520, adjusting the air volume threshold based on the final weighing value and the target weighing value.
Specifically, if the final weighing value is larger than the target weighing value, the air quantity threshold value is reduced;
and if the final weighing value is smaller than the target weighing value, the air quantity threshold value is increased.
For example, the target nominal value is 300kg, the final nominal value is 315kg, the first weighing threshold is 240kg, when the weighing value of the material in the measuring hopper reaches 240kg, the air quantity adjusting part is controlled to adjust the air quantity of the pneumatic conveying device to be smaller than the air quantity threshold, and the material is continuously conveyed into the measuring hopper until the target weighing value is reached or the feeding valve is closed according to the drop value under the air quantity of the air quantity threshold. Because the final weighing value is larger than the target weighing value, the material blanking speed in the second stage conveying process is high, and excessive blanking is caused in the closing process of the feed valve, so that the air volume threshold is reduced, and the air volume is reduced, so that the final weighing value is closer to the target weighing value when the feed valve is used next time. Similarly, when the final weighing value is smaller than the target weighing value, the air quantity threshold value is increased.
The air volume threshold value can be adjusted to be larger or smaller by a certain value each time, and can also be increased according to the percentage. For example, the method is not particularly limited, and the method is used for adjusting the size of the display screen to 1 percentage point each time.
The metering control device provided by the invention is described below, and the metering control device described below and the metering control method described above can be referred to correspondingly.
As shown in fig. 6, the metering control device includes:
the acquisition unit 610 is used for acquiring a weighing value of the material in the metering hopper;
and the control unit 620 is used for controlling the air quantity adjusting piece to adjust the air quantity delivered by the pneumatic conveying device when the weighing value is larger than or equal to the first weighing threshold value.
Wherein, the material is carried to the measuring hopper through the pneumatic conveying device.
Based on the above embodiment, the control unit 620 is specifically configured to control the air volume regulator to adjust the air volume delivered by the pneumatic conveying apparatus to the air volume threshold when the weighing value of the material in the weighing hopper 30 reaches the first weighing threshold. The control unit 620 is configured to obtain a weighted value of the material in the metering hopper, determine a drop value based on the weighted value of the material in the metering hopper, and control the feed valve to close based on the nominal value and the drop value. The drop value represents the weight of the material falling into the weighing hopper in the closing process of the feeding valve, and the feeding valve is used for controlling the on-off of a feeding channel of the weighing hopper.
The embodiment of the invention also provides a metering system, as shown in fig. 7, which comprises a pneumatic conveying device 20, a metering hopper 30, an air quantity adjusting piece and a control device. The output end of the pneumatic conveying device 20 is connected with a feeding channel of the weighing hopper, and the pneumatic conveying device 20 is used for conveying materials into the weighing hopper.
The air quantity adjusting piece is arranged on the pneumatic conveying device and used for adjusting the conveying air quantity of the pneumatic conveying device. The measuring hopper and the air quantity adjusting piece are respectively in communication connection with a control device, and the control device is the measuring control device.
As shown in fig. 7, the feed opening 11 of the powder tank 10 is connected with the hopper 30 through the pneumatic conveying device 20. The hopper 30 is provided with a plurality of feed valves 50. The feed valve 50 includes a first feed valve 51 and a second feed valve 52, and the first feed valve 51 and the second feed valve 52 are butterfly valves. The weighing hopper 30 comprises a hopper body and a weighing sensor 40 for acquiring the weight of the material in the hopper body, wherein the weighing sensor 40 is used for acquiring the weighing value of the material in the weighing hopper, and specifically, the weighing hopper 30 can also comprise a bracket, and the weighing sensor is arranged between the hopper body and the bracket. When the weighing value of the materials in the metering hopper does not reach the first weighing threshold value, the first feeding valve 51 and the second feeding valve 52 are both in an open state, and quick discharging is realized. When the weighing value of the material in the metering hopper is larger than or equal to the first weighing value, the first feeding valve 51 is controlled to be opened, the second feeding valve 52 is controlled to be closed, and only one feeding valve is reserved so as to reduce the discharging amount. The air quantity adjusting piece is used for adjusting the air quantity so as to change the conveying speed of the materials.
The first feed valve 51 and the second feed valve 52 are the same size or the maximum opening of the first feed valve 51 is smaller than the maximum opening of the second feed valve 52. One of the first and second feed valves 51, 52 is controlled to close when the weighing value of the material in the hopper 30 reaches a first weighing threshold. Preferably, if the first feed valve 51 is smaller than the second feed valve 52, the second feed valve 52 is preferably closed to adjust the size of the discharge opening of the hopper 30 to a greater extent.
According to the powder conveying and metering system provided by the embodiment of the invention, a pneumatic conveying device is adopted to convey materials, the conveying air quantity is regulated by the air quantity regulating part, when the weighing value of the materials in the weighing hopper 30 is greater than or equal to the first weighing threshold value, the air quantity regulating part is controlled to regulate the conveying air quantity, and compared with the traditional single conveying air quantity, the conveying flow of the materials in the second stage is reduced, and the metering precision is improved.
Based on the above embodiment, the metering system further includes a pressure stabilizing valve 60, where the pressure stabilizing valve 60 is installed on the pneumatic conveying device and is used for stabilizing the conveying air pressure of the pneumatic conveying device.
Specifically, the pneumatic conveying device is provided with an air inlet channel, and the air quantity adjusting piece and the pressure stabilizing valve 60 are arranged in the air inlet channel. The air volume adjusting member is disposed downstream of the air intake passage, and the pressure stabilizing valve 60 is disposed upstream of the air intake passage. That is, the air flow in the air intake passage passes through the pressure stabilizing valve 60 and then the air quantity adjusting member.
Of course, the air volume adjusting member may be located upstream of the air inlet channel, and the pressure stabilizing valve 60 may be located downstream of the air inlet channel.
Specifically, the air volume adjusting member is a flow control valve 70 or an air volume adjustable fan. When the air quantity adjusting member is a blower, the blower is installed at the air inlet end of the air inlet passage 21. The blower serves as a wind source to supply wind into the pneumatic conveying device 20, and the wind quantity is regulated by frequency conversion. When the air quantity adjusting member is the flow control valve 70, the flow control valve 70 is installed on the air inlet channel 21, and the air quantity is adjusted by adjusting the opening degree.
According to the metering system provided by the embodiment of the invention, the air quantity entering the air duct 20 is regulated through the air quantity regulating part, so that the material discharging speed is regulated, the pressure stabilizing valve 60 keeps the conveying air pressure stable, the metering deviation caused by air pressure change is reduced, and the metering precision is improved.
The pneumatic conveying device comprises a plurality of sections of connected air tanks, each air tank is provided with an air inlet channel, and the air inlet channel of each air tank is provided with an air quantity regulating piece and a pressure stabilizing valve 60.
Therefore, the number of the air inlet channels is the same as the number of the sections of the air grooves, and a plurality of air inlet channels are arranged. Each air inlet channel is provided with an air quantity regulating piece and a pressure stabilizing valve 60. Correspondingly, the control device controlling the air quantity adjusting parts to adjust the air quantity of the pneumatic conveying device refers to controlling all the air quantity adjusting parts so that the sum of the final air quantity of each air quantity adjusting part is smaller than the air quantity before adjustment. For example, controlling the air volume adjusting members to adjust the air volume delivered by the pneumatic conveying device to an air volume threshold value means that all the air volume adjusting members are controlled to adjust the air volume delivered downwards and the sum of the final air volumes delivered by the air volume adjusting members is the air volume threshold value.
In the adjusting process, the air quantity of each air quantity adjusting piece can be the same or different, and the air quantity of the air quantity adjusting piece after being adjusted is the air quantity threshold value.
The pneumatic conveying device can also only comprise a saving air groove, the air groove is provided with an air inlet channel, and the air inlet channel of the air groove is provided with an air quantity regulating piece and a pressure stabilizing valve.
In addition, an embodiment of the invention provides a mixing station comprising the metering system as described above.
Fig. 8 illustrates a physical structure diagram of an electronic device, as shown in fig. 8, which may include: processor 810, communication interface (Communications Interface) 820, memory 830, and communication bus 840, wherein processor 810, communication interface 820, memory 830 accomplish communication with each other through communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform a metering control method comprising: acquiring a weighing value of a material in a metering hopper; when the weighing value is greater than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device; wherein, the material is carried to the measuring hopper through the pneumatic conveying device.
Further, the logic instructions in the memory 830 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the metering control method provided by the above methods, the method comprising: acquiring a weighing value of a material in a metering hopper; when the weighing value is greater than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device; wherein, the material is carried to the measuring hopper through the pneumatic conveying device.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the above provided metering control methods, the method comprising: acquiring a weighing value of a material in a metering hopper; when the weighing value is greater than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device; wherein, the material is carried to the measuring hopper through the pneumatic conveying device.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A metering control method for use in a mixing plant for conveying materials by a pneumatic conveying apparatus, the metering control method comprising:
acquiring a weighing value of a material in a metering hopper;
when the weighing value is larger than or equal to a first weighing threshold value, controlling an air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device to the air quantity threshold value;
wherein, the material is conveyed to the measuring hopper by the pneumatic conveying device;
the air quantity control part is used for controlling the air quantity of the pneumatic conveying device to be reduced, and then the pneumatic conveying device further comprises:
acquiring the weighing values of the materials in the metering hopper at intervals, and determining the average conveying quantity of the materials based on the weighing values acquired at intervals and the interval time;
determining a drop value based on the average conveying amount, the drop value representing the weight of material falling into the weighing hopper during closing of the feed valve;
controlling the feed valve to close based on a target nominal value and the drop value;
the feeding valve is used for controlling the on-off of a feeding channel of the weighing hopper;
acquiring a weighing value of the material in the metering hopper to obtain a final weighing value of the material;
and adjusting the air quantity threshold value based on the final weighing value and the target weighing value.
2. The metering control method according to claim 1, wherein the determining the drop value based on the average conveying amount includes:
and determining the drop value based on the average conveying amount, the closing time length of the feed valve and the correction coefficient.
3. The metering control method of claim 2, wherein the controlling the feed valve to close based on the target value and the drop value further comprises:
acquiring a weighing value of the material in the metering hopper to obtain a final weighing value of the material;
and adjusting the correction coefficient based on the final weighing value and the target weighing value.
4. A metering control device for use in a mixing plant for conveying materials by pneumatic conveying means, the metering control device comprising:
the acquisition unit is used for acquiring a weighing value of the material in the metering hopper;
the control unit is used for controlling the air quantity adjusting piece to adjust the air quantity of the pneumatic conveying device when the weighing value is larger than or equal to a first weighing threshold value;
wherein, the material is conveyed to the measuring hopper by the pneumatic conveying device;
the control unit is also used for acquiring the weighing value of the materials in the metering hopper at intervals and determining the average conveying quantity of the materials based on the weighing value acquired at intervals and the interval time; determining a drop value based on the average conveying amount; controlling the feed valve to close based on a target nominal value and the drop value;
wherein the drop value represents the weight of the material falling into the weighing hopper in the closing process of the feed valve; the feed valve is used for controlling the on-off of a feed channel of the metering hopper;
acquiring a weighing value of the material in the metering hopper to obtain a final weighing value of the material;
and adjusting the air quantity threshold value based on the final weighing value and the target weighing value.
5. The metering system is characterized by comprising a pneumatic conveying device, a metering hopper, an air quantity adjusting piece and a control device;
the output end of the pneumatic conveying device is connected with the feeding channel of the weighing hopper, and the pneumatic conveying device is used for conveying materials to the weighing hopper;
the air quantity adjusting piece is arranged on the pneumatic conveying device and used for adjusting the conveying air quantity of the pneumatic conveying device;
the measuring hopper and the air quantity adjusting piece are respectively in communication connection with the control device, and the control device is the measuring control device according to claim 4.
6. A metering system as claimed in claim 5 further comprising a pressure stabilizing valve mounted on said pneumatic conveying means for stabilizing the conveying air pressure of said pneumatic conveying means.
7. The metering system of claim 6 wherein the pneumatic conveying means is provided with an air inlet channel;
the air quantity adjusting part and the pressure stabilizing valve are both arranged in the air inlet channel, the air quantity adjusting part is positioned at the downstream of the air inlet channel, and the pressure stabilizing valve is positioned at the upstream of the air inlet channel.
8. The metering system of claim 7, wherein the pneumatic conveying apparatus comprises a plurality of connected air tanks, each air tank is provided with an air inlet channel, and the air inlet channel of each air tank is provided with the air quantity adjusting piece and the pressure stabilizing valve.
9. The metering system of claim 5 wherein the air volume adjusting member is a flow control valve or an adjustable air volume blower.
10. A mixing station comprising a metering system as claimed in any one of claims 5 to 9.
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| CN202111673043.2A CN114471350B (en) | 2021-12-31 | 2021-12-31 | Metering control method, metering control device, metering system and stirring station |
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| CN202111673043.2A CN114471350B (en) | 2021-12-31 | 2021-12-31 | Metering control method, metering control device, metering system and stirring station |
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|---|---|---|---|---|
| GB2014321A (en) * | 1978-02-10 | 1979-08-22 | Gattys Verfahrenstech | Pneumatic Conveying Plant for Loose Material |
| CN201520714U (en) * | 2009-08-05 | 2010-07-07 | 陆平 | Device for conveying powdery solid fuel through dilute-phase pneumatic force to produce glass through melting |
| CN202412472U (en) * | 2011-11-02 | 2012-09-05 | 三一重工股份有限公司 | Powder metering device and concrete mixing plant |
| JP2013036950A (en) * | 2011-08-11 | 2013-02-21 | Kawata Mfg Co Ltd | Measurement device |
| CN105129116A (en) * | 2015-07-16 | 2015-12-09 | 安徽正远包装科技有限公司 | Control method for electronic weighing machine |
| WO2019070053A1 (en) * | 2017-10-06 | 2019-04-11 | 三菱日立パワーシステムズ株式会社 | Gas supply system and gas shutoff method |
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|---|---|---|---|---|
| GB2014321A (en) * | 1978-02-10 | 1979-08-22 | Gattys Verfahrenstech | Pneumatic Conveying Plant for Loose Material |
| CN201520714U (en) * | 2009-08-05 | 2010-07-07 | 陆平 | Device for conveying powdery solid fuel through dilute-phase pneumatic force to produce glass through melting |
| JP2013036950A (en) * | 2011-08-11 | 2013-02-21 | Kawata Mfg Co Ltd | Measurement device |
| CN202412472U (en) * | 2011-11-02 | 2012-09-05 | 三一重工股份有限公司 | Powder metering device and concrete mixing plant |
| CN105129116A (en) * | 2015-07-16 | 2015-12-09 | 安徽正远包装科技有限公司 | Control method for electronic weighing machine |
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| CN114471350A (en) | 2022-05-13 |
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