CN116141498A - Metering control method, metering control system and stirring station - Google Patents
Metering control method, metering control system and stirring station Download PDFInfo
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- CN116141498A CN116141498A CN202310198193.5A CN202310198193A CN116141498A CN 116141498 A CN116141498 A CN 116141498A CN 202310198193 A CN202310198193 A CN 202310198193A CN 116141498 A CN116141498 A CN 116141498A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
- B28C7/0418—Proportioning control systems therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Abstract
The invention relates to the field of working machinery, and provides a metering control method, a metering control system and a stirring station, wherein the metering control method comprises the following steps: under a first metering strategy, a metering residual value is obtained based on a target metering value of a current disc material and an actual metering value obtained in real time by a metering device; when the measurement residual value is smaller than or equal to a first threshold value, converting from coarse measurement to fine measurement; in the process of fine weighing and metering, when a metering remaining value is located in a first metering value interval, adopting first fine weighing pulse duration to perform first fine weighing and metering on materials in a fine weighing pulse metering mode, wherein after the first fine weighing pulse duration is adopted to perform fine weighing pulse once, under a first set condition, based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse, the first fine weighing pulse duration adopted by the next fine weighing pulse is obtained. Thus, the precision and the efficiency of material metering are improved.
Description
Technical Field
The invention relates to the technical field of working machinery, in particular to a metering control method, a metering control system and a stirring station.
Background
The mixing plant can mix mixed concrete, at present, the requirement of users on the precision and efficiency of material metering required by the concrete of the mixing plant is higher and higher, the precision of material metering is also high while the material metering efficiency is high, and the balance between the efficiency of material metering and the precision of material metering is an important condition which needs to be met by a metering control method.
The precision weighing in the prior art adopts a precision weighing pulsation weighing mode, the precision weighing pulsation time is fixed, and although the precision weighing efficiency is improved compared with the traditional precision weighing, the matching of the weighing efficiency and precision still cannot be realized.
How to realize the balance of precision and efficiency of material metering is an important problem to be solved in the industry.
Disclosure of Invention
The invention provides a metering control method, a metering control system and a stirring station, which are used for solving the problem that the precision and the efficiency of material metering in the prior art cannot be balanced, realizing the balance of the precision and the efficiency of material metering and improving the metering effect.
The invention provides a metering control method, which comprises the following steps:
under a first metering strategy, a metering residual value is obtained based on a target metering value of a current disc material and an actual metering value obtained in real time by a metering device; the value of a target parameter in the first metering strategy can be adaptively updated, and the target parameter at least comprises a first precise pulse duration;
When the measurement residual value is smaller than or equal to a first threshold value, converting from coarse measurement to fine measurement, wherein the first threshold value is a coarse measurement threshold value;
and in the process of fine weighing and metering, when the metering remaining value is located in a first metering value interval, adopting the first fine weighing pulse duration to carry out first fine weighing and metering on the material in a fine weighing pulse metering mode, wherein after the first fine weighing pulse duration is adopted to carry out fine weighing pulse once, under a first setting condition, acquiring the first fine weighing pulse duration adopted by the next fine weighing pulse based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse.
According to the method for controlling metering provided by the invention, the method for obtaining the first fine pulse duration adopted by the next fine pulse based on the metering remaining value and the first fine pulse duration adopted by the fine pulse of this time comprises the following steps:
obtaining the product of the metering value of the feed and the preset pulsation times when each time of fine pulsation is obtained;
obtaining an adjustment coefficient based on a ratio of the metering remaining value to the product;
and obtaining the first fine pulse duration adopted by the next fine pulse based on the adjustment coefficient and the first fine pulse duration adopted by the fine pulse.
According to the metering control method provided by the invention, the first setting condition comprises that the metering residual value is larger than the maximum allowable error of the target metering value after the first stable duration.
According to the metering control method provided by the invention, before the metering residual value is obtained based on the target metering value of the current coiled material and the actual metering value obtained in real time by the metering device, the metering control method further comprises the following steps:
based on the input operation of the user, determining a metering strategy selected from the first metering strategy and a second metering strategy, wherein the value of the target parameter in the second metering strategy is a fixed value.
According to the metering control method provided by the invention, the metering control method further comprises the following steps:
in the process of fine weighing and metering, when the metering residual value is positioned in a second metering value interval, carrying out second fine weighing and metering on the materials in a continuous feeding mode; the upper limit of the second metering value interval is the first threshold value, and the lower limit is the second threshold value; the upper limit of the first metering value interval is the second threshold value, and the lower limit is the third threshold value; the second threshold is a fine setting value.
According to the metering control method provided by the invention, the metering control method further comprises the following steps:
When the metered material is aggregate, in the process of precise weighing, when the metering residual value is positioned in a third metering value interval, adopting a second precise weighing pulse duration to perform third precise weighing on the material in a precise weighing pulse metering mode; the second nominal pulse duration is less than the first nominal pulse duration; wherein the upper limit of the third measurement value interval is the third threshold value, and the lower limit is the fourth threshold value; the fourth threshold is a drop.
According to the metering control method provided by the invention, the metering control method further comprises the following steps:
when the measured material is powder or water, in the first fine weighing, coarse weighing with a first set duration is performed under a second set condition after primary fine weighing pulsation is performed with the first fine weighing pulsation duration; the second setting condition is that after a second stabilizing period, the metering value of the feeding is zero when the feeding is determined to be continuously and precisely weighed for N times; the second threshold is a drop; the third threshold is a maximum allowable error of the target measurement value.
According to the metering control method provided by the invention, the target parameters further comprise the fine setting value and the drop; the metering control method further comprises the following steps:
Acquiring a first measurement value of a material fed in the process of converting coarse weighing into fine weighing, and acquiring a second measurement value of a material fed in the process of converting the second fine weighing into the first fine weighing;
determining the fine setting value of the next round based on the first measurement value, the second measurement value and the maximum allowable error of the target measurement value;
and determining the drop of the next round based on the maximum allowable error of the second measurement value and the target measurement value.
According to the metering control method provided by the invention, the metering control method further comprises the following steps:
acquiring a first metering value based on a first feeding speed during coarse weighing and a first coefficient of a current coil number; updating the first coefficient of the next round based on the actual metering value of the metering device and the first feeding speed, wherein the first coefficient is the ratio of the first metering value to the first feeding speed;
acquiring a second metering value based on a second feeding speed during precise weighing and a second coefficient of the current coil time; and updating the second coefficient for a next round based on the actual metering value of the metering device and the second feed rate, the second coefficient being a ratio of the second metering value to the second feed rate.
According to the metering control method provided by the invention, the target parameter further comprises the first threshold value; the metering control method further comprises the following steps:
increasing the first threshold based on a first increase when the second fine measure is zero in duration; the first increment is set increment or the coarse weighing is converted into a multiple of a third weighing value of the fed material in the process of the first fine weighing;
when the second precisely measured time period is longer than a second set time period, the first threshold value is reduced based on a first reduction amount; the first reduction is a set reduction or a multiple of a fourth measurement value of the material fed in the process of converting the coarse measurement into the second fine measurement.
According to the metering control method provided by the invention, the target parameters further comprise the fine setting values; the metering control method further comprises the following steps:
after the first fine measurement is finished, if the actual number of fine pulsation in the first fine measurement is smaller than a first set number, increasing the fine set value based on a second increase amount; wherein the second increment is determined based on a product of a measured value of the feed at each fine pulsation and a first number difference, the first number difference being a number difference of the first set number of times and the actual number of times;
After the first fine measurement is finished, if the actual number of fine pulsation in the first fine measurement is larger than a second set number, reducing the fine setting value based on a second reduction amount; wherein the second reduction is determined based on a product of a measured value of the feed at each fine pulsation and a second number difference, the second number difference being a number difference of the actual number and the second set number; the second set number of times is greater than the first set number of times.
The invention also provides a metering control system, comprising:
the metering device, the double-speed metering structure and the controller; the double-speed metering structure comprises a coarse weighing mechanism and a fine weighing mechanism;
the controller is configured to execute any one of the above metering control methods, wherein the coarse weighing mechanism and the fine weighing mechanism are started simultaneously in coarse weighing, and the fine weighing mechanism is started in fine weighing.
The invention also provides a mixing plant comprising a metering control system as described in any one of the above.
According to the metering control method, the system and the stirring station, the coarse metering and the fine metering are adopted for metering materials, in addition, in the process of fine metering, when the metering residual value is located in a first metering value interval, the first fine metering pulse time length is adopted for carrying out first fine metering on the materials in a fine metering pulse metering mode, after the first fine metering pulse time length is adopted for carrying out first fine metering pulse, under a first set condition, the first fine metering pulse time length adopted for the next fine metering pulse can be obtained based on the metering residual value and the first fine metering pulse time length adopted for the fine metering pulse, and therefore the first fine metering pulse time length adopted for the next fine metering pulse can be updated in real time in combination with the metering residual value after each fine metering pulse, the first fine metering pulse time length and the metering residual value adopted for the next fine metering pulse are matched, the requirements of metering precision and efficiency are met, the balance of the metering precision and efficiency of the materials is achieved, and the material metering effect 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 a schematic flow chart of a metering control method provided by the invention;
FIG. 2 is one of the schematic diagrams of the two-speed metering structure provided by the present invention;
FIG. 3 is a second schematic illustration of a two-speed metering structure provided by the present invention;
FIG. 4 is a third schematic illustration of a two-speed metering structure provided by the present invention;
FIG. 5 is a second flow chart of the metering control method according to the present invention;
FIG. 6 is a third flow chart of the metering control method according to the present invention;
FIG. 7 is a schematic diagram of a metering control system provided by the present invention;
fig. 8 is a schematic structural diagram of an electronic device provided by the present invention.
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 6.
The present embodiment provides a metering control method, as shown in fig. 1, including:
and 103, in the process of fine weighing, when the weighing remaining value is in a first weighing value interval, adopting a first fine weighing pulse duration to carry out first fine weighing on the material in a fine weighing pulse weighing mode, wherein after carrying out fine weighing pulse once by adopting the first fine weighing pulse duration, under a first setting condition, acquiring the first fine weighing pulse duration adopted by the next fine weighing pulse based on the weighing remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse.
The material can be aggregate, water or powder. The first metering strategy is a value metering strategy capable of adaptively updating parameters in the process of metering materials, wherein the parameters capable of adaptively updating values are target parameters. Therefore, the labor intensity and the technical requirements of the operation of the manipulator can be greatly reduced.
The metering control method of the present embodiment may be executed by a controller. To improve the efficiency and accuracy of the metering, a two-speed metering structure may be employed, which may include a coarse scale mechanism and a fine scale mechanism, and illustratively, the two-speed metering structure may include a coarse scale mechanism and a fine scale mechanism having different feed rates, where the feed rate of the coarse scale mechanism is greater than the feed rate of the fine scale mechanism. In practical application, for aggregate in materials, the size of the coarse weighing mechanism and the size of the fine weighing mechanism can be the same, and the feeding speed can also be the same. The materials fed by the coarse weighing mechanism and the fine weighing mechanism reach the metering device, and the metering device can meter the fed materials to obtain the actual metering value of the materials. Based on the method, in the process of metering materials, coarse weighing can be performed first, so that the metering efficiency can be improved, and then fine weighing can be performed to meet the metering precision. In coarse weighing, the controller can control the coarse weighing mechanism and the fine weighing mechanism to start simultaneously, and in fine weighing, the controller can control the fine weighing mechanism to start. The fine pulsation mode may also be employed in fine metering, i.e. feeding in a pulsation cycle, for example 500 ms or 600 ms, then stopping feeding, 500 ms or 600 mm again, and then stopping feeding.
Taking materials as aggregate, for example, the two-speed metering structure may include an aggregate bin having a two-door structure, as shown in fig. 2, where the bin has a rough door (i.e., a rough mechanism) and a fine door (i.e., a fine mechanism), and the rough door and the fine door may be the same size, for example. In the rough weighing, the controller can control the rough weighing door and the fine weighing door to be opened simultaneously, and in the fine weighing, the controller can control the rough weighing door to be closed and the fine weighing door to be opened. The fine weighing pulse mode can also be adopted in the fine weighing metering, namely, the fine weighing door is opened according to a pulse period, for example, the fine weighing door is opened for 500 milliseconds or 600 milliseconds, then the fine weighing door is closed, the fine weighing door is stopped for 1500 milliseconds, then the fine weighing door is opened for 500 milliseconds or 600 millimeters, and then the fine weighing door is closed. Correspondingly, the metering device can be an aggregate scale.
Taking materials as powder, for example, the double-speed metering structure may include a powder tank with a primary-secondary spiral structure, as shown in fig. 3, where the powder tank has a primary spiral (i.e., a coarse weighing mechanism) and a secondary spiral (i.e., a fine weighing mechanism), and in the coarse weighing, the controller may control the primary spiral and the secondary spiral to be opened simultaneously, and in the fine weighing, the controller may control the primary spiral to be closed and the secondary spiral to be opened. In the fine weighing, a fine weighing pulsation mode can be adopted, namely, the sub-spiral is opened according to a pulsation period, for example, the sub-spiral is opened for 500 milliseconds or 600 milliseconds, then the sub-spiral is closed, the sub-spiral is stopped for 1500 milliseconds, then the sub-spiral is opened for 500 milliseconds or 600 millimeters, and then the sub-spiral is closed. Correspondingly, the metering device can be a powder balance.
Taking the material as water, for example, the dual-speed metering structure may include a water tank, a liquid storage tank with a water pump and a valve, as shown in fig. 4, where the liquid storage tank has the water pump (i.e., a coarse weighing mechanism) and the valve (i.e., a fine weighing mechanism), and in coarse weighing, the controller may control the water pump and the valve to be opened at the same time, and in fine weighing, the controller may control the water pump to close the valve to be opened. The fine pulsation mode can also be used in fine metering, i.e. the valve is opened according to a pulsation period, for example, 500 ms or 600 ms, then closed, 1500 ms, then 500 ms or 600 mm, and then closed. Correspondingly, the metering device can be a water balance.
In the concrete production process, the materials are mixed according to the formula of the materials required by the concrete, in the mixing process, the materials are required to be measured, in the implementation, the materials can be measured in a plurality of rounds, the measured value of the materials which are required to be obtained in the current round is the target measured value, after the materials are measured, the actual measured value of the materials can be obtained in real time by the measuring device, the difference between the target measured value and the actual measured value is the measured residual value, the measured residual value represents the quantity of the materials which are not measured, the greater the measured residual value is, the more the materials are indicated, otherwise, the smaller the measured residual value is, the less the materials are, and the measured residual value is smaller along with the measurement. In practice, the metering control may be performed based on the metering remaining value.
After the measurement is started, the coarse weighing measurement is started, for example, when the measurement residual value is larger than the first threshold value, or within a third set time period when the measurement is started, the coarse weighing measurement can be performed. As the metering remaining value decreases, when the metering remaining value is equal to the first threshold value, the metering is changed from coarse metering to fine metering, and further, when the metering remaining value is smaller than the first threshold value, the metering of the material is in fine metering. The first threshold is called the coarse threshold. In the process of fine weighing and metering, when the metering remaining value is located in a first metering value interval, a first fine weighing pulse duration can be adopted to carry out first fine weighing and metering on materials in a fine weighing pulse metering mode, and in order to further improve metering efficiency and accuracy, the first fine weighing pulse duration adopted by next fine weighing pulse can be obtained based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse under a first setting condition after the first fine weighing pulse duration is adopted. The first nominal pulse duration is the duration that one nominal pulse experiences. The first setting condition may include a maximum allowable error that the measurement remaining value is greater than the measurement remaining value target measurement value after the first stable period has elapsed. In practice, when the metering surplus value is less than or equal to the maximum allowable error of the target metering value, the maximum allowable error of the target metering value may be a set percentage of the target metering value, for example, 2%, and metering of the material may be ended. Therefore, under the first setting condition, the actual measurement value is more accurate after the measurement device is more stable, and the first fine balance pulse duration adopted by the next fine balance pulse can be updated in real time by combining the measurement residual value after each fine balance pulse, so that the first fine balance pulse duration adopted by the next fine balance pulse is matched with the measurement residual value, and the requirements of measurement precision and efficiency are met.
In addition, after the first stable duration, the obtained actual measurement value is more accurate, and then the measurement residual value is more accurate, so that the accurate real-time update of the first precisely-weighed pulse duration is realized, and the accuracy of material measurement is higher.
The target parameter may include a first nominal pulse duration.
In this embodiment, two manners of coarse weighing and fine weighing are adopted for material weighing, and when the measurement residual value is located in a first measurement value interval, a first fine weighing pulse time length is adopted for carrying out first fine weighing on materials in a fine weighing pulse measurement manner, and after first fine weighing pulse time length is adopted for carrying out first fine weighing pulse, under a first set condition, the first fine weighing pulse time length adopted for next fine weighing pulse can be obtained based on the measurement residual value and the first fine weighing pulse time length adopted for this fine weighing pulse, so that the first fine weighing pulse time length adopted for next fine weighing pulse can be updated in real time by combining the measurement residual value after each fine weighing pulse, the first fine weighing pulse time length adopted for next fine weighing pulse is matched with the measurement residual value, thereby meeting the requirements of measurement precision and efficiency, achieving the balance of precision and efficiency of material weighing, and improving the effect of material weighing.
In an exemplary embodiment, the obtaining the first fine pulse duration used by the next fine pulse based on the measurement remaining value and the first fine pulse duration used by the present fine pulse includes:
obtaining the product of the metering value of the feed and the preset pulsation times when each time of fine pulsation is obtained;
obtaining an adjustment coefficient based on a ratio of the metering remaining value to the product;
and obtaining the first fine pulse duration adopted by the next fine pulse based on the adjustment coefficient and the first fine pulse duration adopted by the fine pulse.
Wherein the metering value of the feed at each fine pulsation may be obtained by a variation of the actual value obtained by the metering device at each fine pulsation. The preset number of pulses may be set according to actual needs, for example, 4.
The next fine pulse takes the first fine pulse duration t 2 Obtained by the following formula:
t 1 the first precise pulse duration adopted for the precise pulse is G Order of (A) To target measurement value, G Real world For the actual measurement, T is the preset pulse frequency, G Pulse The metering of the feed was performed for each fine pulse.
For adjusting the coefficients.
In practical application, along with the reduction of the measurement residual value, the first fine-scale pulse duration can be properly reduced, so that the measurement precision and efficiency are improved.
In an exemplary embodiment, before the obtaining the measurement residual value, the method further includes:
based on the input operation of the user, determining a metering strategy selected from the first metering strategy and a second metering strategy, wherein the value of the target parameter in the second metering strategy is a fixed value.
In practical applications, a first metering strategy and a second metering strategy which can be selected by a user can be provided. The value of the target parameter in the second metering strategy is a fixed value, so that the requirement of a specific application scene on the precision can be met. For example, the second metering strategy may be a high-iron specific metering strategy that may meet high-iron stringent accuracy requirements. In implementation, a selection flag bit K of the metering policy may be set, where a flag bit k=1 indicates that the second metering policy is selected, and where a flag bit k=0 indicates that the first metering policy is selected.
Therefore, the first metering strategy and the second metering strategy can be switched according to the actual demands of users, and the proper metering strategy is selected, so that not only can the strict precision requirement be easily met, but also the dual requirements of high precision and high efficiency can be met.
In an exemplary embodiment, the metering control method may further include: in the process of fine weighing and metering, when the metering residual value is positioned in a second metering value interval, carrying out second fine weighing and metering on the materials in a continuous feeding mode; the upper limit of the second metering value interval is the first threshold value, and the lower limit is the second threshold value; the upper limit of the first metering value interval is the second threshold, the lower limit of the first metering value interval is the third threshold, and the second threshold is a fine setting value.
In practice, when the second fine weighing is performed on the material in a continuous feeding mode, the fine weighing mechanism can be controlled to be kept open, so that continuous feeding can be realized.
In this embodiment, before the fine weighing pulsation, the fine weighing is performed in a continuous feeding manner, which is beneficial to further improving the efficiency of the weighing.
In an exemplary embodiment, the metering control method may further include:
when the metered material is aggregate, in the process of precise weighing, when the metering residual value is positioned in a third metering value interval, adopting a second precise weighing pulse duration to perform third precise weighing on the material in a precise weighing pulse metering mode; the second nominal pulse duration is less than the first nominal pulse duration; wherein the upper limit of the third measurement value interval is the third threshold value, and the lower limit is the fourth threshold value; the fourth threshold is a drop.
In practical application, after the first fine weighing pulse metering mode is adopted to meter the material in the first fine weighing pulse metering mode, the second fine weighing pulse metering mode can be adopted to meter the material in the third fine weighing pulse metering mode continuously, so that the two-wheel fine weighing pulse metering mode is adopted, and the measurement residual value is reduced, so that the second fine weighing pulse time adopted in the latter round of fine weighing pulse metering stage is smaller than the first fine weighing pulse time adopted in the former round of fine weighing pulse metering stage, and the metering precision and efficiency can be improved.
The drop is the stop advance. After the instruction of stopping feeding is sent, a part of materials are still in the air, and the feeding can be stopped in advance to avoid larger errors caused by the part of materials.
The following illustrates a first metering strategy when the material is aggregate.
Illustratively, the following conditions are preset:
first condition: the metering remaining value is greater than the first threshold value or within a third set period of time at which metering begins.
Second condition: the measurement remaining value is within a second measurement value interval formed by the first threshold value and the second threshold value.
Third condition: the measurement remaining value is within a first measurement value interval formed by the second threshold value and the third threshold value.
Fourth condition: the measurement remaining value is greater than the maximum allowable error of the target measurement value.
Fifth condition: the measurement remaining value is within a third measurement value interval formed by the third threshold value and the fourth threshold value.
Referring to fig. 5, after the measurement is started, whether the first condition is satisfied is determined, if yes, the rough weighing gate and the fine weighing gate are opened, the rough weighing gate is started, whether the first condition is satisfied is continuously determined in the rough weighing, and if not, whether the second condition is satisfied is determined.
If the second condition is met, the precise weighing door is opened, namely the precise weighing is changed into precise weighing, the second precise weighing is carried out, and if not, whether the third condition is met is judged.
If the third condition is met, opening the fine weighing gate pulse by the first fine weighing pulse duration, namely performing first fine weighing measurement, and judging whether the fourth condition is met after each fine weighing pulse reaches the first stable duration;
if the fourth condition is met, updating the first fine pulse duration adopted by the next fine pulse, otherwise, continuously judging whether the third condition is met;
if the third condition is not met, continuously judging whether the fifth condition is met, if so, opening the fine weighing gate by the second fine weighing pulse duration, otherwise, ending the metering.
In this embodiment, the first precisely-weighted pulse duration can be adjusted in an adaptive manner, so that the metering efficiency and accuracy are improved.
It should be noted that if the second metering strategy is adopted, the main difference between the second metering strategy and the first metering strategy is that there is no adaptive process of the target parameters. A second metering strategy is illustrated below with the material as aggregate.
In the first metering strategy, a metering residue value is obtained based on a target metering value of a current coiled material and an actual metering value obtained in real time by a metering device;
when the measurement residual value is equal to a first threshold value, converting the coarse measurement into the fine measurement, wherein the first threshold value is the coarse measurement threshold value;
in the process of fine weighing and metering, when the metering residual value is positioned in a second metering value interval, carrying out second fine weighing and metering on the materials in a continuous feeding mode; the upper limit of the second metering value interval is a first threshold value, the lower limit of the second metering value interval is a second threshold value, and the second threshold value is a fine setting value;
when the measurement residual value is located in a first measurement value interval, adopting a first precise pulsation time length to perform first precise measurement on the materials in a precise pulsation measurement mode; the upper limit of the first metering value interval is a second threshold value, and the lower limit is a third threshold value;
When the measurement residual value is in a third measurement value interval, adopting a second precise pulsation time length to perform third precise measurement on the materials in a precise pulsation measurement mode; the second nominal pulse duration is less than the first nominal pulse duration; wherein the upper limit of the third measurement value interval is a third threshold value, and the lower limit is a fourth threshold value; the fourth threshold is the drop.
And when the measurement residual value is positioned in a fourth measurement value interval, performing fourth fine weighing measurement on the material in a fine weighing pulsation measurement mode by adopting a second fine weighing pulsation time, wherein after performing primary fine weighing pulsation by adopting the second fine weighing pulsation time, obtaining an actual measurement value through a third stable time, wherein the upper limit of the fourth measurement value interval is a fourth threshold value, and the lower limit is the maximum allowable error of the target measurement value.
In practical application, when the measurement residual value is smaller than the maximum allowable error of the target measurement value, the measurement is ended.
The third stable duration may be longer than the first stable duration, so that the actual measurement value may be obtained after the measurement device is more stable, and the measurement accuracy may be improved. The metering control method in the embodiment is applied to a metering scene of concrete ingredients of a high-speed rail station, and can reach the qualification rate of more than 99.5%.
In an exemplary embodiment, the metering control method may further include:
when the measured material is powder or water, in the first fine weighing, coarse weighing with a first set duration is performed under a second set condition after primary fine weighing pulsation is performed with the first fine weighing pulsation duration; the second setting condition is that after a second stabilizing period, the metering value of the feeding is zero when the feeding is determined to be continuously and precisely weighed for N times; the second threshold is a drop; the third threshold is a maximum allowable error of the target measurement value.
Wherein, the value of N is more than or equal to 2. The metering value of the feeding material during each fine pulsation in the fine pulsation metering mode can be obtained through a metering device. In the first fine weighing, if the fine weighing pulsation is carried out once and the corresponding stable duration is stabilized, the weighing value of the feeding material is zero when the fine weighing pulsation is carried out continuously for multiple times, so that no material is supplied, and at the moment, a certain amount of material can be supplemented by carrying out coarse weighing for a first set duration, thereby meeting the requirement of the first fine weighing on the material, avoiding the loss of precision caused by insufficient material supply and improving the feeding efficiency of the material.
It should be noted that the main difference between the second metering strategy and the first metering strategy is that there is no adaptive update of the target parameters. The second metering strategy for powder and water will be described below taking powder or water as an example.
Illustratively, the following conditions are preset:
eighth condition: the actual measurement value is smaller than a first threshold value;
ninth condition: the metering remaining value is greater than the first threshold or within a fourth set duration of metering initiation.
Tenth condition: the measurement remaining value is in a second measurement value interval formed by the first threshold value and the second threshold value, and the second threshold value is a drop.
Eleventh condition: the measurement residual value is in a first measurement value interval formed by a second threshold value and a third threshold value, and the third threshold value is the maximum allowable error of the target measurement value.
Twelfth condition: the metering value of the feed is zero for a number of consecutive (e.g. 2) fine pulses.
Referring to fig. 6, after the metering is started, it is determined whether the eighth condition is satisfied, if so, the fifth set period of time (for example, 0.2 s) is roughly referred to, and after the fourth stable period of time is reached, it is continuously determined whether the eighth condition is satisfied, and if not, it is continuously determined whether the ninth condition is satisfied.
If the ninth condition is met, coarse weighing is performed, if not, whether the tenth condition is met is judged, if yes, the process is changed into fine weighing, namely, second fine weighing is performed, and if not, whether the eleventh condition is met is judged.
If the eleventh condition is met, opening the fine weighing gate pulse by the first fine weighing pulse time length, namely performing first fine weighing measurement, and judging whether the twelfth condition is met after the fine weighing pulse is finished each time and the third stable time length is reached;
if the twelfth condition is met, coarse weighing measurement is carried out for a first set time period (for example, 0.2 s), and after the second stable time period is passed, whether the twelfth condition is met is continuously judged;
if the twelfth condition is not met, continuing to judge whether the eleventh condition is met;
if the eleventh condition is not satisfied, the metering is ended.
In this embodiment, the accuracy of the measurement can be improved by precisely weighing the stabilization process after pulsation.
In an exemplary embodiment, the target parameter further comprises the first threshold; the metering control method further comprises the following steps:
increasing the first threshold based on a first increase when the second fine measure is zero in duration; the first increment is set increment or the coarse weighing is converted into a multiple of a third weighing value of the fed material in the process of the first fine weighing;
when the second precisely measured time period is longer than a second set time period, the first threshold value is reduced based on a first reduction amount; the first reduction is a set reduction or a multiple of a fourth measurement value of the material fed in the process of converting the coarse measurement into the second fine measurement.
Specifically, increasing the first threshold based on the first increment may result in the first threshold in the next round.
Specifically, reducing the first threshold value of the metering surplus value based on the first reduction amount may result in the first threshold value in the next round.
As shown in fig. 5, a sixth condition and a seventh condition may be set;
sixth condition: the second nominal metering duration is zero.
Seventh condition: the second precise measurement duration is longer than the second set duration.
When the sixth condition is satisfied, the first threshold in the next round needs to be updated. The first increment may be a set increment (for example, 100 kg), or may be obtained by a first setting algorithm, for example, may be a multiple (for example, 2 times) of a third measurement value of the material fed in the course of calculating the coarse-scale measurement to the first fine-scale measurement, and specifically, the third measurement value may be obtained by a change in an actual measurement value obtained by the measuring device in the course of calculating the coarse-scale measurement to the first fine-scale measurement.
When the duration of the second fine weighing is zero, which indicates that the fine weighing of continuous feeding is not performed, the first threshold value can be increased based on the first increasing amount, and the increased first threshold value is used as the first threshold value in the next round of metering, so that the metering precision and efficiency are improved.
When the seventh condition is satisfied, the first threshold value in the next round needs to be updated. The first reduction may be a set reduction (for example, 100 kg), or may be obtained by a second setting algorithm, for example, a multiple (for example, 4 times) of a fourth measurement value of the material fed in the course of converting the coarse measurement into the second fine measurement may be calculated, and specifically, the fourth measurement value may be obtained by a change in an actual measurement value obtained in the course of converting the coarse measurement into the second fine measurement by the measuring device.
When the second precise weighing duration is longer than the second set duration, the duration of continuous feeding precise weighing is indicated, and the second precise weighing duration is longer, at this time, the first threshold value can be reduced based on the first reduction, and the reduced first threshold value is taken as the first threshold value in the next round of measurement, so that the coarse weighing is increased, and the efficiency and the accuracy of measurement are improved.
In an exemplary embodiment, the target parameter further includes the fine setting value; the metering control method further comprises the following steps:
after the first fine measurement is finished, if the actual number of fine pulsation in the first fine measurement is smaller than a first set number, increasing the fine set value based on a second increase amount; wherein the second increment is determined based on a product of a measured value of the feed at each fine pulsation and a first number difference, the first number difference being a number difference of the first set number of times and the actual number of times;
After the first fine measurement is finished, if the actual number of fine pulsation in the first fine measurement is larger than a second set number, reducing the fine setting value based on a second reduction amount; wherein the second reduction is determined based on a product of a measured value of the feed at each fine pulsation and a second number difference, the second number difference being a number difference of the actual number and the second set number; the second set number of times is greater than the first set number of times.
In practical application, referring to fig. 5, after the first fine measurement is finished, the actual number of fine measurement pulses (i.e. the pulse number) in the first fine measurement may be obtained, where the actual number of fine measurement pulses is smaller than the first set number (e.g. 2 times), which indicates that the actual number of fine measurement pulses is smaller, and the measurement accuracy is lower, where the fine set value may be increased based on a second increment, which may be determined by combining the product of the measurement value of the feed and the first number difference value at each fine measurement pulse, and the second increment is exemplary of the product of the measurement value of the feed and the first number difference value at each fine measurement pulse. Specifically, the second increment can be obtained by the following formula.
Δw1＝G Pulse ×(C 1 -C 2 ) (2)
Wherein Deltaw 1 is the second increment, C 2 For practical times, C 1 Is the first set number of times.
If the actual number of fine pulses is greater than the second set number (e.g., 5 times), it is indicated that the actual number of fine pulses is greater and the metering efficiency is lower, at this time, the fine set value may be reduced based on a second reduction amount, so that the actual number of fine pulses may be increased, where the second reduction amount may be determined by combining the product of the metering value of the feed and the second number difference value at each fine pulse, and the second reduction amount is exemplary of the product of the metering value of the feed and the second number difference value at each fine pulse. Specifically, the second reduction amount can be obtained by the following formula.
Δw2＝G Pulse ×(C 3 -C 2 )/P (3)
Wherein Deltaw 2 is the second reduction, C 2 For practical times, C 3 For the second set number of times, P is a preset value, and P may be 1.5, for example.
The present embodiment provides a first adaptive updating manner of the fine setting value, and by associating the fine pulsation count with the fine setting value, the fine pulsation count can be controlled within a reasonable count by adjusting the fine setting value, thereby improving the efficiency and accuracy of the metering control.
In an exemplary embodiment, the target parameters further include the fine setting value and the drop; the metering control method further comprises the following steps:
Acquiring a first measurement value of a material fed in the process of converting coarse weighing into fine weighing, and acquiring a second measurement value of a material fed in the process of converting the second fine weighing into the first fine weighing;
determining the fine setting value of the next round based on the first measurement value, the second measurement value and the maximum allowable error of the target measurement value;
and determining the drop of the next round based on the maximum allowable error of the second measurement value and the target measurement value.
The embodiment provides a second self-adaptive updating mode of the fine setting value and a self-adaptive updating mode of the drop, and improves the precision and the efficiency of material metering of the mixing station through self-adaptive updating of the fine setting value and the drop.
Specifically, the metering control method may further include:
acquiring a first metering value based on a first feeding speed during coarse weighing and a first coefficient of a current coil number; updating the first coefficient of the next round based on the actual metering value of the metering device and the first feeding speed, wherein the first coefficient is the ratio of the first metering value to the first feeding speed;
acquiring a second metering value based on a second feeding speed during precise weighing and a second coefficient of the current coil time; and updating the second coefficient for a next round based on the actual metering value of the metering device and the second feed rate, the second coefficient being a ratio of the second metering value to the second feed rate.
The present embodiment provides a third adaptive update mode of the fine setting value.
The second self-adaptive updating mode of the fine setting value has slower adjusting efficiency, is not easy to be interfered, and has higher stability; compared with the second self-adaptive updating mode of the fine setting value, the third self-adaptive updating mode of the fine setting value has higher adjusting efficiency.
In addition, any one of three self-adaptive updating modes of the fine setting value can be selected and set in advance according to actual conditions.
In practical application, the following parameters can be collected in the current round: the first feeding speed V1 during coarse weighing, the second feeding speed V2 during fine weighing, the first weighing value W1 of the fed material during coarse weighing, the second weighing value W2 of the fed material during first fine weighing and the maximum allowable error Y acceptable by a user. The following parameters can also be collected in real time: target measurement value M, actual measurement value C, measurement residual value s=m—c. The process of updating the fine setting value X and the drop height L is as follows:
and judging whether the measurement residual value S is smaller than or equal to the maximum allowable error Y of the target measurement value, if so, ending the measurement, otherwise, updating the fine setting value and the drop.
And judging whether the measurement residual value S is larger than a first threshold value or not, or within a set period of time when measurement starts, if so, carrying out coarse measurement, updating a fine set value, otherwise, updating a first coefficient K1, and judging whether the measurement residual value S is smaller than or equal to the first threshold value and larger than a second threshold value (is a drop head).
If yes, the precise weighing is carried out, the fall L is updated, and otherwise, the second coefficient K2 is updated.
Wherein:
X＝W1+W2+Y(4)
L＝W2+Y(5)
or alternatively, the process may be performed,
X＝V1*K1+W2+Y(6)
K1＝W1/V1(7)
L＝V2*K2+Y(8)
K2＝W2/V2(9)
the specific updating modes of the fine setting value and the fall can be selected according to the needs.
In this embodiment, the coarse weighing is changed into the fine weighing, the second fine weighing is changed into the first fine weighing, so as to update the fine setting value and the drop, and the accuracy of the weighing can be improved.
In addition, in the embodiment, the second and third adaptive updating modes of the fine setting value are provided, and in a specific embodiment, the adaptive updating mode of any one of the fine setting value can be selected in advance according to the actual accuracy requirement for metering.
The metering control system provided by the invention is described below, and the metering control system described below and the metering control method described above can be referred to correspondingly.
As shown in fig. 7, the present embodiment provides a metering control system including:
the controller 701 is configured to execute the method for controlling metering provided in any of the foregoing embodiments, wherein the coarse weighing mechanism and the fine weighing mechanism are simultaneously activated in the coarse weighing, and the fine weighing mechanism is activated in the fine weighing.
The invention also provides a stirring station, which comprises the metering control system provided by any embodiment.
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:
under a first metering strategy, a metering residual value is obtained based on a target metering value of a current disc material and an actual metering value obtained in real time by a metering device; the value of a target parameter in the first metering strategy can be adaptively updated, and the target parameter at least comprises a first precise pulse duration;
When the measurement residual value is smaller than or equal to a first threshold value, converting from coarse measurement to fine measurement, wherein the first threshold value is a coarse measurement threshold value;
and in the process of fine weighing and metering, when the metering remaining value is located in a first metering value interval, adopting the first fine weighing pulse duration to carry out first fine weighing and metering on the material in a fine weighing pulse metering mode, wherein after the first fine weighing pulse duration is adopted to carry out fine weighing pulse once, under a first setting condition, acquiring the first fine weighing pulse duration adopted by the next fine weighing pulse based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse.
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 of 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 a metering control method provided by the above methods, the method comprising:
under a first metering strategy, a metering residual value is obtained based on a target metering value of a current disc material and an actual metering value obtained in real time by a metering device; the value of a target parameter in the first metering strategy can be adaptively updated, and the target parameter at least comprises a first precise pulse duration;
when the measurement residual value is smaller than or equal to a first threshold value, converting from coarse measurement to fine measurement, wherein the first threshold value is a coarse measurement threshold value;
and in the process of fine weighing and metering, when the metering remaining value is located in a first metering value interval, adopting the first fine weighing pulse duration to carry out first fine weighing and metering on the material in a fine weighing pulse metering mode, wherein after the first fine weighing pulse duration is adopted to carry out fine weighing pulse once, under a first setting condition, acquiring the first fine weighing pulse duration adopted by the next fine weighing pulse based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse.
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:
under a first metering strategy, a metering residual value is obtained based on a target metering value of a current disc material and an actual metering value obtained in real time by a metering device; the value of a target parameter in the first metering strategy can be adaptively updated, and the target parameter at least comprises a first precise pulse duration;
when the measurement residual value is smaller than or equal to a first threshold value, converting from coarse measurement to fine measurement, wherein the first threshold value is a coarse measurement threshold value;
and in the process of fine weighing and metering, when the metering remaining value is located in a first metering value interval, adopting the first fine weighing pulse duration to carry out first fine weighing and metering on the material in a fine weighing pulse metering mode, wherein after the first fine weighing pulse duration is adopted to carry out fine weighing pulse once, under a first setting condition, acquiring the first fine weighing pulse duration adopted by the next fine weighing pulse based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse.
The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and 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 such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of 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 (13)
1. A metering control method, characterized by comprising:
under a first metering strategy, a metering residual value is obtained based on a target metering value of a current disc material and an actual metering value obtained in real time by a metering device; the value of a target parameter in the first metering strategy can be adaptively updated, and the target parameter at least comprises a first precise pulse duration;
when the measurement residual value is smaller than or equal to a first threshold value, converting from coarse measurement to fine measurement, wherein the first threshold value is a coarse measurement threshold value;
and in the process of fine weighing and metering, when the metering remaining value is located in a first metering value interval, adopting the first fine weighing pulse duration to carry out first fine weighing and metering on the material in a fine weighing pulse metering mode, wherein after the first fine weighing pulse duration is adopted to carry out fine weighing pulse once, under a first setting condition, acquiring the first fine weighing pulse duration adopted by the next fine weighing pulse based on the metering remaining value and the first fine weighing pulse duration adopted by the fine weighing pulse.
2. The method according to claim 1, wherein the obtaining the first fine pulse duration to be used for the next fine pulse based on the measurement remaining value and the first fine pulse duration to be used for the present fine pulse includes:
obtaining the product of the metering value of the feed and the preset pulsation times when each time of fine pulsation is obtained;
obtaining an adjustment coefficient based on a ratio of the metering remaining value to the product;
and obtaining the first fine pulse duration adopted by the next fine pulse based on the adjustment coefficient and the first fine pulse duration adopted by the fine pulse.
3. The metering control method as set forth in claim 1, wherein the first setting condition includes that the metering remaining value is greater than a maximum allowable error of the target metering value after a first stable period of time has elapsed.
4. A metering control method as claimed in any one of claims 1 to 3, wherein the method further comprises, before obtaining the metering surplus value, based on the target metering value of the current round of material and an actual metering value obtained in real time by the metering device:
based on the input operation of the user, determining a metering strategy selected from the first metering strategy and a second metering strategy, wherein the value of the target parameter in the second metering strategy is a fixed value.
5. The metering control method according to claim 1, characterized by further comprising:
in the process of fine weighing and metering, when the metering residual value is positioned in a second metering value interval, carrying out second fine weighing and metering on the materials in a continuous feeding mode; the upper limit of the second metering value interval is the first threshold value, and the lower limit is the second threshold value; the upper limit of the first metering value interval is the second threshold, the lower limit of the first metering value interval is the third threshold, and the second threshold is a fine setting value.
6. The metering control method as claimed in claim 5, further comprising:
when the metered material is aggregate, in the process of precise weighing, when the metering residual value is positioned in a third metering value interval, adopting a second precise weighing pulse duration to perform third precise weighing on the material in a precise weighing pulse metering mode; the second nominal pulse duration is less than the first nominal pulse duration; wherein the upper limit of the third measurement value interval is the third threshold value, and the lower limit is the fourth threshold value; the fourth threshold is a drop.
7. The metering control method as claimed in claim 5, further comprising:
when the measured material is powder or water, in the first fine weighing, coarse weighing with a first set duration is performed under a second set condition after primary fine weighing pulsation is performed with the first fine weighing pulsation duration; the second setting condition is that after a second stabilizing period, the metering value of the feeding is zero when the feeding is determined to be continuously and precisely weighed for N times; the second threshold is a drop; the third threshold is a maximum allowable error of the target measurement value.
8. The metering control method according to claim 6 or 7, wherein the target parameter further includes the fine setting value and the fall; the metering control method further comprises the following steps:
acquiring a first measurement value of a material fed in the process of converting coarse weighing into fine weighing, and acquiring a second measurement value of a material fed in the process of converting the second fine weighing into the first fine weighing;
determining the fine setting value of the next round based on the first measurement value, the second measurement value and the maximum allowable error of the target measurement value;
and determining the drop of the next round based on the maximum allowable error of the second measurement value and the target measurement value.
9. The metering control method as claimed in claim 8, further comprising:
acquiring a first metering value based on a first feeding speed during coarse weighing and a first coefficient of a current coil number; updating the first coefficient of the next round based on the actual metering value of the metering device and the first feeding speed, wherein the first coefficient is the ratio of the first metering value to the first feeding speed;
acquiring a second metering value based on a second feeding speed during precise weighing and a second coefficient of the current coil time; and updating the second coefficient for a next round based on the actual metering value of the metering device and the second feed rate, the second coefficient being a ratio of the second metering value to the second feed rate.
10. The metering control method of claim 5 wherein the target parameter further comprises the first threshold; the metering control method further comprises the following steps:
increasing the first threshold based on a first increase when the second fine measure is zero in duration; the first increment is set increment or the coarse weighing is converted into a multiple of a third weighing value of the fed material in the process of the first fine weighing;
when the second precisely measured time period is longer than a second set time period, the first threshold value is reduced based on a first reduction amount; the first reduction is a set reduction or a multiple of a fourth measurement value of the material fed in the process of converting the coarse measurement into the second fine measurement.
11. The metering control method according to claim 5, wherein the target parameter further includes the fine setting value; the metering control method further comprises the following steps:
after the first fine measurement is finished, if the actual number of fine pulsation in the first fine measurement is smaller than a first set number, increasing the fine set value based on a second increase amount; wherein the second increment is determined based on a product of a measured value of the feed at each fine pulsation and a first number difference, the first number difference being a number difference of the first set number of times and the actual number of times;
After the first fine measurement is finished, if the actual number of fine pulsation in the first fine measurement is larger than a second set number, reducing the fine setting value based on a second reduction amount; wherein the second reduction is determined based on a product of a measured value of the feed at each fine pulsation and a second number difference, the second number difference being a number difference of the actual number and the second set number; the second set number of times is greater than the first set number of times.
12. A metering control system, comprising:
the metering device, the double-speed metering structure and the controller; the double-speed metering structure comprises a coarse weighing mechanism and a fine weighing mechanism;
the controller is configured to execute the metering control method according to any one of claims 1 to 11, wherein the coarse weighing mechanism and the fine weighing mechanism are simultaneously activated in coarse weighing, and the fine weighing mechanism is activated in fine weighing.
13. A mixing station comprising the metering control system of claim 12.
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