Metering control method, system and mixing station

Abstract

The present invention relates to the field of operating machinery and provides a metering control method, system and mixing station, wherein the method comprises: under a first metering strategy, based on the target metering value of the current batch of materials and the actual metering value obtained in real time by the metering device, obtaining a metering residual value; when the metering residual value is less than or equal to a first threshold value, switching from rough metering to fine metering; during the fine metering process, when the metering residual value is within the first metering value interval, using a first fine metering pulsation duration to perform a first fine metering measurement on the material in a fine metering pulsation metering manner, wherein after performing a fine metering pulsation using the first fine metering pulsation duration, under a first set condition, based on the metering residual value and the first fine metering pulsation duration used for this fine metering pulsation, obtaining the first fine metering pulsation duration used for the next fine metering pulsation. In this way, the accuracy and efficiency of material metering are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of operating machinery, and in particular to a metering control method, system and mixing station. Background Art

[0002] The mixing station can mix concrete. At present, users have higher and higher requirements for the accuracy and efficiency of the material metering required for the concrete mixing station. While the material metering efficiency is high, the material metering accuracy must also be high. Achieving a balance between the efficiency and accuracy of material metering is an important condition that the metering control method needs to meet.

[0003] The existing precision measurement technology adopts the precision pulsation measurement method with a fixed precision pulsation time. Although it improves the efficiency compared with the traditional precision measurement, it still cannot achieve the matching of measurement efficiency and accuracy.

[0004] How to achieve a balance between accuracy and efficiency in material metering is an important issue that needs to be urgently addressed in the industry. Summary of the Invention

[0005] The present invention provides a metering control method, system and mixing station, which are used to solve the problem of the unbalanced precision and efficiency of material metering in the prior art, achieve the balance between the precision and efficiency of material metering, and improve the metering effect.

[0006] The present invention provides a metering control method, comprising:

[0007] Under the first metering strategy, a metering residual value is obtained based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device; the value of the target parameter in the first metering strategy can be adaptively updated, and the target parameter includes at least the first precise weighing pulsation duration;

[0008] When the remaining measurement value is less than or equal to a first threshold, the system switches from coarse measurement to fine measurement, where the first threshold is a coarse measurement threshold.

[0009] During the precise weighing and measurement process, when the measurement surplus value is within the first measurement value interval, the first precise weighing and pulsation duration is used to perform a first precise weighing and measurement on the material in a precise weighing and pulsation measurement manner. After a precise weighing and pulsation is performed once using the first precise weighing and pulsation duration, under a first set condition, the first precise weighing and pulsation duration used for the next precise weighing and pulsation is obtained based on the measurement surplus value and the first precise weighing and pulsation duration used for this precise weighing and pulsation.

[0010] According to a metering control method provided by the present invention, obtaining the first precise weighing pulsation duration used in the next precise weighing pulsation based on the metering residual value and the first precise weighing pulsation duration used in the current precise weighing pulsation includes:

[0011] Obtain the product of the feed measurement value and the preset pulsation number during each precise weighing pulsation;

[0012] obtaining an adjustment coefficient based on a ratio of the metering residual value to the product;

[0013] Based on the adjustment coefficient and the first precise weighing pulsation duration used in the current precise weighing pulsation, the first precise weighing pulsation duration used in the next precise weighing pulsation is obtained.

[0014] According to a metering control method provided by the present invention, the first setting condition includes that after a first stable time period, the metering residual value is greater than a maximum allowable error of the target metering value.

[0015] According to a metering control method provided by the present invention, before obtaining the metering residual value based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device, the method further includes:

[0016] Based on a user input operation, a metering strategy selected from the first metering strategy and a second metering strategy is determined, wherein the value of the target parameter in the second metering strategy is a fixed value.

[0017] A metering control method provided by the present invention further includes:

[0018] During the precise weighing process, when the residual measurement value is in the second measurement value interval, the material is subjected to a second precise weighing in a continuous feeding manner; the upper limit of the second measurement value interval is the first threshold value, and the lower limit is the second threshold value; the upper limit of the first measurement value interval is the second threshold value, and the lower limit is the third threshold value; the second threshold value is a fine setting value.

[0019] A metering control method provided by the present invention further includes:

[0020] When the material being measured is aggregate, during the precise weighing process, when the measurement surplus value is within the third measurement value interval, the material is subjected to a third precise weighing measurement using a precise weighing pulsation measurement method using a second precise weighing pulsation duration; the second precise weighing pulsation duration is less than the first precise weighing pulsation 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 value is a drop.

[0021] A metering control method provided by the present invention further includes:

[0022] When the material being measured is powder or water, in the first fine weighing measurement, after a fine weighing pulsation is performed using the first fine weighing pulsation duration, a rough weighing measurement for the first set duration is performed under the second set condition; the second set condition is that after the second stable time, it is determined that the metering value of the feed is zero after N consecutive fine weighing pulsations; the second threshold is the drop; and the third threshold is the maximum allowable error of the target metering value.

[0023] According to a metering control method provided by the present invention, the target parameter further includes the detailed set value and the drop; the metering control method further includes:

[0024] Obtaining a first measurement value of the material fed during the process of converting the rough weighing measurement into the fine weighing measurement, and obtaining a second measurement value of the material fed during the process of converting the second fine weighing measurement into the first fine weighing measurement;

[0025] determining the detailed set value for the next batch based on the maximum allowable error of the first measurement value, the second measurement value, and the target measurement value;

[0026] The drop of the next plate is determined based on the maximum allowable error between the second measurement value and the target measurement value.

[0027] A metering control method provided by the present invention further includes:

[0028] Obtaining the first measurement value based on a first feeding speed during rough weighing and a first coefficient of the current batch; and updating the first coefficient for the next batch based on an actual measurement value of the metering device and the first feeding speed, where the first coefficient is a ratio of the first measurement value to the first feeding speed;

[0029] Based on the second feed speed during precise weighing and the second coefficient of the current plate, the second measurement value is obtained; and based on the actual measurement value of the metering device and the second feed speed, the second coefficient of the next plate is updated, and the second coefficient is the ratio of the second measurement value to the second feed speed.

[0030] According to a metering control method provided by the present invention, the target parameter further includes the first threshold value; the metering control method further includes:

[0031] When the duration of the second precise weighing is zero, the first threshold is increased based on the first increment; the first increment is a multiple of the third measurement value of the material fed during the process of converting the set increment or the rough weighing to the first precise weighing;

[0032] When the duration of the second precise weighing is greater than the second set duration, the first threshold is reduced based on the first reduction amount; the first reduction amount is a multiple of the fourth measurement value of the material input during the set reduction amount or the conversion from rough weighing to the second precise weighing.

[0033] According to a metering control method provided by the present invention, the target parameter also includes the detailed set value; the metering control method further includes:

[0034] After the first precise weighing is completed, if the actual number of precise weighing pulsations in the first precise weighing is less than the first set number, the fine set value is increased based on a second increment; wherein the second increment is determined by multiplying the metered value of the feed during each precise weighing pulsation by the first number difference, and the first number difference is the difference between the first set number and the actual number;

[0035] After the first precise weighing is completed, if the actual number of precise weighing pulsations in the first precise weighing is greater than the second set number, the fine set value is reduced based on a second reduction amount; wherein the second reduction amount is determined based on the product of the metering value of the feed during each precise weighing pulsation and the second number difference, the second number difference is the difference between the actual number and the second set number; the second set number is greater than the first set number.

[0036] The present invention also provides a metering control system, comprising:

[0037] Metering device, dual-speed metering structure and controller; the dual-speed metering structure includes a coarse weighing mechanism and a fine weighing mechanism;

[0038] The controller is used to execute any one of the above-mentioned metering control methods, wherein the coarse weighing mechanism and the fine weighing mechanism are simultaneously started in coarse weighing, and the fine weighing mechanism is started in fine weighing.

[0039] The present invention also provides a mixing station, comprising any one of the metering control systems described above.

[0040] The metering control method, system and mixing station provided by the present invention adopt both coarse metering and fine metering to measure materials. Moreover, in the process of fine metering, when the metering residual value is in the first metering value interval, the first fine metering pulsation duration can be used to perform the first fine metering measurement on the material in the fine metering pulsation metering mode. After a fine metering pulsation is performed using the first fine metering pulsation duration, under the first set condition, the first fine metering pulsation duration used for the next fine metering pulsation can be obtained based on the metering residual value and the first fine metering pulsation duration used for this fine metering pulsation. In this way, the first fine metering pulsation duration used for the next fine metering pulsation can be updated in real time in combination with the metering residual value after each fine metering pulsation, so that the first fine metering pulsation duration used for the next fine metering pulsation matches the metering residual value, thereby meeting the requirements of metering accuracy and efficiency, achieving a balance between the accuracy and efficiency of material metering, and improving the effect of material metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is one of the flow charts of the metering control method provided by the present invention;

[0043] Figure 2 This is one of the schematic diagrams of the dual-speed metering structure provided by the present invention;

[0044] Figure 3 This is the second schematic diagram of the dual-speed metering structure provided by the present invention;

[0045] Figure 4 This is the third schematic diagram of the dual-speed metering structure provided by the present invention;

[0046] Figure 5 This is the second flow chart of the metering control method provided by the present invention;

[0047] Figure 6 This is the third flow chart of the metering control method provided by the present invention;

[0048] Figure 7 It is a structural diagram of the metering control system provided by the present invention;

[0049] Figure 8 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0051] The following combination Figures 1 to 6 The metering control method of the present invention is described.

[0052] This embodiment provides a metering control method, such as Figure 1 Shown, including:

[0053] Step 101: Under a first metering strategy, a metering residual value is obtained based on a target metering value of the material in the current batch and an actual metering value obtained in real time by a metering device. The values ​​of target parameters in the first metering strategy in the coarse metering can be adaptively updated, and the target parameters in the coarse metering include at least a first fine pulsation duration.

[0054] Step 102: When the remaining value in the rough weighing is less than or equal to a first threshold, the rough weighing is switched to the fine weighing, and the first threshold is the rough weighing threshold;

[0055] Step 103: During the precise weighing process, when the measurement surplus value is within the first measurement value interval, the material is precisely weighed using the precise weighing pulsation measurement method using the first precise weighing pulsation duration. After a precise weighing pulsation is performed using the first precise weighing pulsation duration, the first precise weighing pulsation duration to be used for the next precise weighing pulsation is obtained under the first set condition based on the measurement surplus value and the first precise weighing pulsation duration used for this precise weighing pulsation.

[0056] The material here can be aggregate, water, or powder. The first metering strategy is a value metering strategy that can adaptively update parameters during the material metering process. The parameter that can be adaptively updated is the target parameter. This can significantly reduce the operator's workload and technical requirements.

[0057] The metering control method of this embodiment can be executed by a controller. In order to improve the efficiency and accuracy of metering, a dual-speed metering structure can be adopted. The dual-speed metering structure can include a coarse weighing mechanism and a fine weighing mechanism. For example, the dual-speed metering structure can include a coarse weighing mechanism and a fine weighing mechanism with different feeding speeds. If the feeding speeds are different, the feeding speed of the coarse weighing mechanism is greater than the feeding speed of the fine weighing mechanism. In practical applications, for aggregates among the materials, the size of the coarse weighing mechanism and 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 arrive at the metering device, and the metering device can measure the materials fed in and obtain the actual metering value of the materials. Based on this, in the process of metering the materials, coarse weighing can be performed first, thereby improving the efficiency of metering, and then fine weighing can be performed to meet the accuracy of metering. In coarse weighing, the controller can first control the coarse weighing mechanism and the fine weighing mechanism to start at the same time. In fine weighing, the controller can control the fine weighing mechanism to start. In precise metering, a precise pulsation method can also be used, that is, feeding according to a pulsation cycle, for example, feeding for 500 milliseconds or 600 milliseconds, then stopping feeding, then feeding for 500 milliseconds or 600 millimeters, and then stopping feeding.

[0058] Taking aggregate as an example, the dual-speed metering structure may include an aggregate silo with a double-door structure, such as Figure 2 As shown, the silo has a coarse weighing door (i.e., a coarse weighing mechanism) and a fine weighing door (i.e., a fine weighing mechanism). For example, the coarse weighing door and the fine weighing door can be the same size. In coarse weighing, the controller can first control the coarse weighing door and the fine weighing door to open at the same time. In fine weighing, the controller can control the coarse weighing door to close and the fine weighing door to open. In fine weighing, a fine weighing pulsation method can also be used, that is, the fine weighing door is opened according to the pulsation cycle, for example, the fine weighing door is opened for 500 milliseconds or 600 milliseconds, then closed, paused for 1500 milliseconds, and then opened for 500 milliseconds or 600 mm, and then closed. Correspondingly, the metering device can be an aggregate scale.

[0059] Taking powder as an example, the dual-speed metering structure may include a powder tank with a parent-child spiral structure, such as Figure 3 As shown, the powder tank has a mother screw (i.e., a coarse weighing mechanism) and a sub-screw (i.e., a fine weighing mechanism). During coarse weighing, the controller can first control the mother screw and the sub-screw to open simultaneously. During fine weighing, the controller can control the mother screw to close and the sub-screw to open. In fine weighing, a fine weighing pulsation method can also be used, that is, the sub-screw is opened according to the pulsation cycle. For example, the sub-screw is opened for 500 milliseconds or 600 milliseconds, then closed, paused for 1500 milliseconds, and then opened for 500 milliseconds or 600 milliseconds, and then closed again. Accordingly, the metering device can be a powder scale.

[0060] Taking water as an example, the dual-speed metering structure may include a water tank, a liquid storage tank with a water pump and a valve, such as Figure 4 As shown, the liquid storage tank has a water pump (i.e., a coarse weighing mechanism) and a valve (i.e., a fine weighing mechanism). In coarse weighing, the controller can first control the water pump and valve to open simultaneously. In fine weighing, the controller can control the water pump to close and the valve to open. In fine weighing, a fine weighing pulsation method can also be used, that is, the valve is opened according to the pulsation cycle. For example, the valve is opened for 500 milliseconds or 600 milliseconds, then closed, paused for 1500 milliseconds, and then opened for 500 milliseconds or 600 milliseconds, and then closed. Correspondingly, the metering device can be a water material scale.

[0061] During concrete production, materials are batched according to the recipe for the required concrete materials. During the batching process, materials need to be metered. During implementation, the materials can be metered in multiple batches. The target metered value to be achieved in the current batch is the target metered value. Once metering begins, the metering device can obtain the actual metered value of the material in real time. The difference between the target metered value and the actual metered value is the metered residual value. The metered residual value indicates the amount of remaining unmetered material. A larger metered residual value indicates more material remaining, while a smaller metered residual value indicates less material remaining. As metering progresses, the metered residual value decreases. During implementation, metering control can be performed based on the metered residual value.

[0062] After metering begins, it first enters the rough metering stage. For example, rough metering can be performed when the metering residual value is greater than the first threshold value, or within the third set time length at the start of metering. As the metering residual value decreases, when the metering residual value is equal to the first threshold value, it switches from rough metering to fine metering. Specifically, when the metering residual value is less than the first threshold value, the metering of the material is in fine metering. The first threshold value is the rough threshold value. During the fine metering process, when the metering residual value is within the first metering value interval, the first fine metering pulsation duration can be used to perform a first fine metering of the material in a fine metering pulsation metering manner. To further improve metering efficiency and accuracy, after a fine metering pulsation is performed using the first fine metering pulsation duration, under the first set condition, based on the metering residual value and the first fine metering pulsation duration used for this fine metering pulsation, the first fine metering pulsation duration used for the next fine metering pulsation is obtained. The first fine metering pulsation duration is the duration of a fine metering pulsation. The first set condition may include that after the first stable time length, the metering residual value is greater than the maximum allowable error of the target metering value of the metering residual value. In practice, when the metered residual value is less than or equal to the maximum allowable error of the target metered value, which can be a set percentage of the target metered value, such as 2%, the material metering can be terminated. Thus, under the first set condition, obtaining the actual metered value more accurately after the metering device becomes more stable can be used to update the first fine weighing pulse duration used for the next fine weighing pulse in real time based on the metered residual value after each fine weighing pulse, ensuring that the first fine weighing pulse duration used for the next fine weighing pulse matches the metered residual value, thereby meeting the requirements for metering accuracy and efficiency.

[0063] In addition, after the first stable time, the actual measurement value obtained is more accurate, so the measurement residual value is more accurate, thereby achieving accurate real-time update of the first precise weighing pulsation time and higher accuracy in material measurement.

[0064] The above-mentioned target parameter may include the first precise pulsation duration.

[0065] In this embodiment, both rough weighing and fine weighing are used to measure materials. Moreover, in the process of fine weighing, when the metering residual value is in the first metering value interval, the first fine weighing pulsation duration can be used to measure the material for the first time in the fine weighing pulsation method. After a fine weighing pulsation is performed using the first fine weighing pulsation duration, under the first set condition, the first fine weighing pulsation duration used for the next fine weighing pulsation can be obtained based on the metering residual value and the first fine weighing pulsation duration used for this fine weighing pulsation. In this way, the first fine weighing pulsation duration used for the next fine weighing pulsation can be updated in real time based on the metering residual value after each fine weighing pulsation, so that the first fine weighing pulsation duration used for the next fine weighing pulsation matches the metering residual value, thereby meeting the requirements of metering accuracy and efficiency, achieving a balance between the accuracy and efficiency of material metering, and improving the effect of material metering.

[0066] In an exemplary embodiment, obtaining the first precise weighing pulsation duration to be used in the next precise weighing pulsation based on the metering remaining value and the first precise weighing pulsation duration used in the current precise weighing pulsation includes:

[0067] Obtain the product of the feed measurement value and the preset pulsation number during each precise weighing pulsation;

[0068] obtaining an adjustment coefficient based on a ratio of the metering residual value to the product;

[0069] Based on the adjustment coefficient and the first precise weighing pulsation duration used in the current precise weighing pulsation, the first precise weighing pulsation duration used in the next precise weighing pulsation is obtained.

[0070] The metering value of the feed material during each precise weighing pulsation can be obtained by the change in the actual value obtained by the metering device during one precise weighing pulsation. The preset number of pulsations can be set according to actual needs, for example, 4.

[0071] For example, the first precise weighing pulsation duration t2 used in the next precise weighing pulsation is obtained by the following formula:

[0072]

[0073] t1 is the duration of the first precise weighing pulse used in this precise weighing pulse, G 目 is the target measurement value, G 实 is the actual measurement value, T is the preset pulsation number, G 脉 It is the metering value of the material fed during each precise weighing pulsation. is the adjustment coefficient.

[0074] In actual applications, as the measurement residual value decreases, the first precise weighing pulsation duration can be appropriately reduced to improve the measurement accuracy and efficiency. In this embodiment, the measurement residual value and the first precise weighing pulsation duration used in this precise weighing pulsation are combined to make the first precise weighing pulsation duration used in the next precise weighing pulsation after update more accurate.

[0075] In an exemplary embodiment, before obtaining the metering residual value based on the target metering value of the material of the current batch and the actual metering value obtained in real time by the metering device, the method further includes:

[0076] Based on a user input operation, a metering strategy selected from the first metering strategy and a second metering strategy is determined, wherein the value of the target parameter in the second metering strategy is a fixed value.

[0077] In practical applications, a first and second metering strategy can be provided for user selection. The target parameter values ​​in the second metering strategy are fixed values ​​that can meet the accuracy requirements of specific application scenarios. For example, the second metering strategy can be a metering strategy dedicated to high-speed rail, which can meet the stringent accuracy requirements of high-speed rail. During implementation, a metering strategy selection flag bit K can be set. When flag bit K = 1, it indicates that the second metering strategy is selected, and when flag bit K = 0, it indicates that the first metering strategy is selected.

[0078] In this way, the first metering strategy and the second metering strategy can be switched according to the actual needs of the user, and the appropriate metering strategy can be selected, so that the strict accuracy requirements can be easily achieved and the dual requirements of high precision and high efficiency can be met.

[0079] In an exemplary embodiment, the metering control method may further include: in the process of precise metering, when the metering residual value is in a second metering value interval, performing a second precise metering on the material in a continuous feeding manner; 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, and the second threshold value is a fine set value.

[0080] In practice, when the second precise weighing of the material is performed in a continuous feeding manner, the precise weighing mechanism can be controlled to remain open, thereby enabling continuous feeding.

[0081] In this embodiment, before the precise weighing and pulsation, precise weighing and metering are first performed in a continuous feeding manner, which is beneficial to further improve the metering efficiency.

[0082] In an exemplary embodiment, the metering control method may further include:

[0083] When the material being measured is aggregate, during the precise weighing process, when the measurement surplus value is within the third measurement value interval, the material is subjected to a third precise weighing measurement using a precise weighing pulsation measurement method using a second precise weighing pulsation duration; the second precise weighing pulsation duration is less than the first precise weighing pulsation 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 value is a drop.

[0084] In practical applications, after the first precise weighing and pulsation measurement method is used to perform the first precise weighing and pulsation measurement on the material, the second precise weighing and pulsation measurement method can be continued to be used to perform the third precise weighing and pulsation measurement on the material. In this way, a two-round precise weighing and pulsation measurement method is used. Since the measurement residual value is decreasing, the second precise weighing and pulsation measurement stage used in the latter round of precise weighing and pulsation measurement is shorter than the first precise weighing and pulsation measurement stage used in the previous round of precise weighing and pulsation measurement, which can improve the measurement accuracy and efficiency.

[0085] The drop is the advance amount for stopping the feeding. After the instruction to stop feeding is issued, there is still some material in the air. In order to avoid the large error caused by this part of the material, the feeding can be stopped in advance.

[0086] The following example uses the first metering strategy when the material is aggregate.

[0087] For example, the following conditions are pre-set:

[0088] First condition: the metering remaining value is greater than the first threshold or is within a third set time period from the start of metering.

[0089] Second condition: the metering remaining value is within a second metering value interval formed by the first threshold and the second threshold.

[0090] Third condition: the metering remaining value is within a first metering value interval formed by the second threshold and the third threshold.

[0091] Fourth condition: the measurement residual value is greater than the maximum allowable error of the target measurement value.

[0092] Fifth condition: the metering remaining value is within a third metering value interval formed by the third threshold value and the fourth threshold value.

[0093] See also Figure 5 After starting measurement, determine whether the first condition is met. If so, open the rough weighing door and the fine weighing door and enter the rough weighing measurement. In the rough weighing measurement, continue to determine whether the first condition is met. If not, determine whether the second condition is met.

[0094] If the second condition is met, open the precision weighing door, switch to precision weighing, and perform the second precision weighing. Otherwise, determine whether the third condition is met.

[0095] If the third condition is met, the precision weighing gate is opened by the first precision weighing pulsation duration, i.e., the first precision weighing measurement is performed. After each precision weighing pulsation reaches the first stable duration, it is determined whether the fourth condition is met.

[0096] If the fourth condition is met, the first precise weighing pulse duration used in the next precise weighing pulse is updated; otherwise, the third condition is determined.

[0097] If the third condition is not met, continue to judge whether the fifth condition is met. If so, the precision gate is pulsed open according to the second precision pulse duration. Otherwise, the measurement is terminated.

[0098] In this embodiment, the first precise weighing pulsation duration can be adjusted in an adaptive manner, thereby improving the efficiency and accuracy of measurement.

[0099] It should be noted that the main difference between the second metering strategy and the first metering strategy is that there is no adaptive process of the target parameters. The following example uses aggregate as an example to illustrate the second metering strategy.

[0100] In the first metering strategy, the metering residual value is obtained based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device;

[0101] When the measurement remaining value is equal to the first threshold, the measurement is switched from coarse measurement to fine measurement. The first threshold is the coarse threshold;

[0102] During the precise weighing process, when the remaining measurement value is within the second measurement value interval, the material is subjected to a second precise weighing in a continuous feeding manner; the upper limit of the second measurement value interval is the first threshold value, the lower limit is the second threshold value, and the second threshold value is the fine setting value;

[0103] When the measurement residual value is within the first measurement value interval, the material is first precisely measured using the precise pulsation measurement method using the first precise pulsation duration; the upper limit of the first measurement value interval is the second threshold value, and the lower limit is the third threshold value;

[0104] When the measurement residual value is in the third measurement value interval, the material is subjected to a third precision weighing measurement using the precision weighing pulsation measurement method using the second precision weighing pulsation duration; the second precision weighing pulsation duration is less than the first precision weighing pulsation duration; 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 value is the drop.

[0105] When the measurement residual value is in the fourth measurement value interval, the second precision weighing pulsation duration is used to perform a fourth precision weighing measurement on the material in a precision weighing pulsation measurement method, wherein, after a precision weighing pulsation is performed using the second precision weighing pulsation duration, the actual measurement value is obtained after a third stable time. The upper limit of the fourth measurement value interval is the fourth threshold value, and the lower limit is the maximum allowable error of the target measurement value.

[0106] In practical applications, when the remaining measurement value is less than the maximum allowable error of the target measurement value, the measurement ends.

[0107] The third stabilization time period can be longer than the first stabilization time period. This allows the actual measurement value to be obtained after the metering device becomes more stable, thereby improving measurement accuracy. The metering control method of this embodiment is applied to the metering of concrete batching at a high-speed railway station, achieving a pass rate of over 99.5%.

[0108] In an exemplary embodiment, the metering control method may further include:

[0109] When the material being measured is powder or water, in the first fine weighing measurement, after a fine weighing pulsation is performed using the first fine weighing pulsation duration, a rough weighing measurement for the first set duration is performed under the second set condition; the second set condition is that after the second stable time, it is determined that the metering value of the feed is zero after N consecutive fine weighing pulsations; the second threshold is the drop; and the third threshold is the maximum allowable error of the target metering value.

[0110] The value of N is greater than or equal to 2. The metering device can obtain the metering value of the feed material during each fine weighing pulsation in the fine weighing pulsation metering method. In the first fine weighing metering, if the feed material metering value is zero for multiple consecutive fine weighing pulsations after a fine weighing pulsation and a corresponding stabilization time, it means that there is no material supply. In this case, a certain amount of material can be replenished by performing rough weighing for the first set time, thereby meeting the material demand of the first fine weighing metering, avoiding the loss of accuracy caused by insufficient material supply, and improving the material feeding efficiency.

[0111] 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 or water is described below using powder or water as an example.

[0112] For example, the following conditions are pre-set:

[0113] Eighth condition: the actual measurement value is less than the first threshold;

[0114] Ninth condition: the metering remaining value is greater than the first threshold value or is within the fourth set time period of metering startup.

[0115] Tenth condition: the metering remaining value is within a second metering value interval formed by the first threshold and the second threshold, and the second threshold is a gap.

[0116] Eleventh condition: the metering residual value is within a first metering value interval formed by the second threshold and the third threshold, and the third threshold is a maximum allowable error of the target metering value.

[0117] The twelfth condition: the metering value of the feed is zero when the precise weighing pulsation is repeated for multiple times (for example, twice).

[0118] See also Figure 6 After starting measurement, determine whether the eighth condition is met. If so, roughly measure the fifth set time (for example, 0.2s). After reaching the fourth stable time, continue to determine whether the eighth condition is met. If not, continue to determine whether the ninth condition is met.

[0119] If the ninth condition is met, rough weighing is performed; otherwise, whether the tenth condition is met is determined; if the tenth condition is met, fine weighing is performed, i.e., second fine weighing is performed; otherwise, whether the eleventh condition is met is determined.

[0120] If the eleventh condition is met, the precision weighing gate is opened by pulsating for the first precision weighing pulsation duration, i.e., the first precision weighing measurement is performed. After each precision weighing pulsation ends and reaches the third stable duration, it is determined whether the twelfth condition is met;

[0121] If the twelfth condition is met, a rough weighing is performed for a first set time (e.g., 0.2s). After a second stable time, the twelfth condition is determined again.

[0122] If the twelfth condition is not met, continue to determine whether the eleventh condition is met;

[0123] If the eleventh condition is not met, the measurement ends.

[0124] In this embodiment, the measurement accuracy can be improved by accurately weighing the stabilization process after the pulsation.

[0125] In an exemplary embodiment, the target parameter further includes the first threshold value; and the metering control method further includes:

[0126] When the duration of the second precise weighing is zero, the first threshold is increased based on the first increment; the first increment is a multiple of the third measurement value of the material fed during the process of converting the set increment or the rough weighing to the first precise weighing;

[0127] When the duration of the second precise weighing is greater than the second set duration, the first threshold is reduced based on the first reduction amount; the first reduction amount is a multiple of the fourth measurement value of the material input during the set reduction amount or the conversion from rough weighing to the second precise weighing.

[0128] Specifically, the first threshold value in the next round can be obtained by increasing the first threshold value based on the first increase amount.

[0129] Specifically, the first threshold value in the next disk can be obtained by reducing the first threshold value of the metering remaining value based on the first reduction amount.

[0130] like Figure 5 As shown, the sixth and seventh conditions can be set;

[0131] Sixth condition: The duration of the second precise weighing is zero.

[0132] Seventh condition: The duration of the second precise weighing is greater than the second set duration.

[0133] When the sixth condition is met, the first threshold value for the next batch needs to be updated. The first increment can be a set increment (e.g., 100 kg) or can be obtained using a first set algorithm. For example, it can be a multiple (e.g., 2) of the third measured value of the material fed during the conversion from coarse weighing to first fine weighing. Specifically, the third measured value can be obtained by the change in the actual measured value obtained by the metering device during the conversion from coarse weighing to first fine weighing.

[0134] When the duration of the second precise weighing is zero, it indicates that there is no precise weighing of continuous feeding. At this time, the first threshold value can be increased based on the first increase amount, and the increased first threshold value can be used as the first threshold value in the next plate for measurement, thereby improving the measurement accuracy and efficiency.

[0135] When the seventh condition is met, the first threshold value for the next batch needs to be updated. The first reduction amount can be a set reduction amount (e.g., 100 kg) or can be obtained using a second set algorithm. For example, it can be a multiple (e.g., 4 times) of the fourth measurement value of the material fed during the conversion from coarse weighing to second fine weighing. Specifically, the fourth measurement value can be obtained by the change in the actual measurement value obtained by the metering device during the conversion from coarse weighing to second fine weighing.

[0136] When the duration of the second fine weighing is greater than the second set duration, it indicates that the fine weighing of continuous feeding has been completed, and the duration of the second fine weighing is longer. At this time, the first threshold value can be reduced based on the first reduction amount, and the reduced first threshold value can be used as the first threshold value in the next plate for measurement, so that the rough weighing measurement is increased, thereby improving the efficiency and accuracy of measurement.

[0137] In an exemplary embodiment, the target parameter further includes the detailed set value; and the metering control method further includes:

[0138] After the first precise weighing is completed, if the actual number of precise weighing pulsations in the first precise weighing is less than the first set number, the fine set value is increased based on a second increment; wherein the second increment is determined by multiplying the metered value of the feed during each precise weighing pulsation by the first number difference, and the first number difference is the difference between the first set number and the actual number;

[0139] After the first precise weighing is completed, if the actual number of precise weighing pulsations in the first precise weighing is greater than the second set number, the fine set value is reduced based on a second reduction amount; wherein the second reduction amount is determined based on the product of the metering value of the feed during each precise weighing pulsation and the second number difference, the second number difference is the difference between the actual number and the second set number; the second set number is greater than the first set number.

[0140] In practical applications, see Figure 5 After the first precise weighing is completed, the actual number of precise weighing pulsations (i.e., the number of pulsations) in the first precise weighing can be obtained. If this actual number is less than the first set number (e.g., 2 times), it means that the actual number of precise weighing pulsations is small and the measurement accuracy is low. In this case, the fine set value can be increased based on the second increment, thereby increasing the actual number of precise weighing pulsations. The second increment can be determined by combining the metered value of the feed during each precise weighing pulsation and the product of the first number difference. For example, the second increment is the product of the metered value of the feed during each precise weighing pulsation and the first number difference. Specifically, the second increment can be obtained using the following formula.

[0141] Δw1=G 脉 ×(C1-C2) (2)

[0142] Wherein, Δw1 is the second increment, C2 is the actual number of times, and C1 is the first set number of times.

[0143] If the actual number of fine-weighing pulsations is greater than the second set number (e.g., 5), this indicates that the actual number of fine-weighing pulsations is high and the metering efficiency is low. In this case, the fine set value can be reduced based on the second reduction amount, thereby increasing the actual number of fine-weighing pulsations. The second reduction amount can be determined by combining the metered value of the material fed during each fine-weighing pulsation and the product of the second number difference. For example, the second reduction amount is the product of the metered value of the material fed during each fine-weighing pulsation and the second number difference. Specifically, the second reduction amount can be obtained using the following formula.

[0144] Δw2=G 脉 ×(C3-C2) / P (3)

[0145] Wherein, Δw2 is the second reduction amount, C2 is the actual number, C3 is the second set number, and P is a preset value. For example, P may be 1.5.

[0146] This embodiment provides a first adaptive update method for the fine set value. By associating the number of fine pulsations with the fine set value, the efficiency and accuracy of metering control can be improved by adjusting the fine set value to control the number of fine pulsations within a reasonable number.

[0147] In an exemplary embodiment, the target parameter further includes the detailed set value and the drop; and the metering control method further includes:

[0148] Obtaining a first measurement value of the material fed during the process of converting the rough weighing measurement into the fine weighing measurement, and obtaining a second measurement value of the material fed during the process of converting the second fine weighing measurement into the first fine weighing measurement;

[0149] determining the detailed set value for the next batch based on the maximum allowable error of the first measurement value, the second measurement value, and the target measurement value;

[0150] The drop of the next plate is determined based on the maximum allowable error between the second measurement value and the target measurement value.

[0151] This embodiment provides a second adaptive update method for the fine set value and an adaptive update method for the head, and improves the accuracy and efficiency of material metering in the mixing station by adaptively updating the fine set value and the head.

[0152] Specifically, the metering control method may further include:

[0153] Obtaining the first measurement value based on a first feeding speed during rough weighing and a first coefficient of the current batch; and updating the first coefficient for the next batch based on an actual measurement value of the metering device and the first feeding speed, where the first coefficient is a ratio of the first measurement value to the first feeding speed;

[0154] Based on the second feed speed during precise weighing and the second coefficient of the current plate, the second measurement value is obtained; and based on the actual measurement value of the metering device and the second feed speed, the second coefficient of the next plate is updated, and the second coefficient is the ratio of the second measurement value to the second feed speed.

[0155] This embodiment provides a third adaptive updating method for fine setting values.

[0156] It should be noted that the second adaptive update method of the fine set value has a slower adjustment efficiency, but is not easily disturbed and has higher stability; compared with the second adaptive update method of the fine set value, the third adaptive update method of the fine set value has higher adjustment efficiency.

[0157] In addition, any one of the three adaptive updating methods of the fine setting value can be pre-selected and set according to actual conditions.

[0158] In practice, the following parameters can be collected during the current run: the first feed rate V1 for coarse weighing, the second feed rate V2 for fine weighing, the first measured value W1 of the material fed during the transition from coarse weighing to fine weighing, the second measured value W2 of the material fed during the transition from second fine weighing to first fine weighing, and the maximum permissible error Y acceptable to the user. The following parameters can also be collected in real time: the target measured value M, the actual measured value C, and the remaining measured value S = MC. The process for updating the fine set value X and the drop L is as follows:

[0159] When judging whether the metering residual value S is less than or equal to the maximum allowable error Y of the target metering value, if so, the metering ends, otherwise the detailed set value and the gap can be updated.

[0160] Determine whether the metering remaining value S is greater than the first threshold, or within the set time length at the start of metering. If so, perform rough metering and update the fine setting value. Otherwise, update the first coefficient K1 and determine whether the metering remaining value S is less than or equal to the first threshold and greater than the second threshold (the difference).

[0161] If so, perform precise weighing and update the height difference L; otherwise, update the second coefficient K2.

[0162] in:

[0163] X=W1+W2+Y(4)

[0164] L=W2+Y(5)

[0165] or,

[0166] X=V1*K1+W2+Y(6)

[0167] K1=W1 / V1(7)

[0168] L=V2*K2+Y(8)

[0169] K2=W2 / V2(9)

[0170] The specific updating method of the detailed setting value and the drop can be selected as needed.

[0171] In this embodiment, the measurement value during the conversion from coarse weighing to fine weighing and from the second fine weighing to the first fine weighing is combined to update the fine set value and the drop, which can improve the measurement accuracy.

[0172] In addition, in this embodiment, the second and third adaptive update methods of the fine setting value are provided. In a specific embodiment, any one of the two adaptive update methods of the fine setting value can be pre-selected and set for measurement according to actual accuracy requirements.

[0173] The metering control system provided by the present invention is described below. The metering control system described below and the metering control method described above can be referenced to each other.

[0174] like Figure 7 As shown, this embodiment provides a metering control system, including:

[0175] Metering device 702, dual-speed metering structure 703 and controller 701; dual-speed metering structure 703 includes a coarse weighing mechanism and a fine weighing mechanism;

[0176] The controller 701 is used to execute the metering control method provided by any of the above embodiments, wherein the coarse weighing mechanism and the fine weighing mechanism are simultaneously started in the coarse weighing, and the fine weighing mechanism is started in the fine weighing.

[0177] The present invention also provides a mixing station, comprising the metering control system provided by any of the above embodiments.

[0178] Figure 8 An example of a physical structure diagram of an electronic device is shown below. Figure 8 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the metering control method, which includes:

[0179] Under the first metering strategy, a metering residual value is obtained based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device; the value of the target parameter in the first metering strategy can be adaptively updated, and the target parameter includes at least the first precise weighing pulsation duration;

[0180] When the remaining measurement value is less than or equal to a first threshold, the system switches from coarse measurement to fine measurement, where the first threshold is a coarse measurement threshold.

[0181] During the precise weighing and measurement process, when the measurement surplus value is within the first measurement value interval, the first precise weighing and pulsation duration is used to perform a first precise weighing and measurement on the material in a precise weighing and pulsation measurement manner. After a precise weighing and pulsation is performed once using the first precise weighing and pulsation duration, under a first set condition, the first precise weighing and pulsation duration used for the next precise weighing and pulsation is obtained based on the measurement surplus value and the first precise weighing and pulsation duration used for this precise weighing and pulsation.

[0182] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0183] On the other hand, the present invention further provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the metering control method provided by the above methods, which includes:

[0184] Under the first metering strategy, a metering residual value is obtained based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device; the value of the target parameter in the first metering strategy can be adaptively updated, and the target parameter includes at least the first precise weighing pulsation duration;

[0185] When the remaining measurement value is less than or equal to a first threshold, the system switches from coarse measurement to fine measurement, where the first threshold is a coarse measurement threshold.

[0186] During the precise weighing and measurement process, when the measurement surplus value is within the first measurement value interval, the first precise weighing and pulsation duration is used to perform a first precise weighing and measurement on the material in a precise weighing and pulsation measurement manner. After a precise weighing and pulsation is performed once using the first precise weighing and pulsation duration, under a first set condition, the first precise weighing and pulsation duration used for the next precise weighing and pulsation is obtained based on the measurement surplus value and the first precise weighing and pulsation duration used for this precise weighing and pulsation.

[0187] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the above-mentioned metering control method, the method comprising:

[0188] Under the first metering strategy, a metering residual value is obtained based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device; the value of the target parameter in the first metering strategy can be adaptively updated, and the target parameter includes at least the first precise weighing pulsation duration;

[0189] When the remaining measurement value is less than or equal to a first threshold, the system switches from coarse measurement to fine measurement, where the first threshold is a coarse measurement threshold.

[0190] During the precise weighing and measurement process, when the measurement surplus value is within the first measurement value interval, the first precise weighing and pulsation duration is used to perform a first precise weighing and measurement on the material in a precise weighing and pulsation measurement manner. After a precise weighing and pulsation is performed once using the first precise weighing and pulsation duration, under a first set condition, the first precise weighing and pulsation duration used for the next precise weighing and pulsation is obtained based on the measurement surplus value and the first precise weighing and pulsation duration used for this precise weighing and pulsation.

[0191] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. That is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0192] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus the necessary general hardware platform, or of course, by means of hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or certain parts of the embodiment.

[0193] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A metering control method, characterized in that: include: Under the first metering strategy, a metering residual value is obtained based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device; the value of the target parameter in the first metering strategy can be adaptively updated, and the target parameter includes at least the first precise weighing pulsation duration; When the remaining measurement value is less than or equal to a first threshold, the system switches from coarse measurement to fine measurement, where the first threshold is a coarse measurement threshold. During the precise weighing process, when the measurement surplus value is within a first measurement value interval, the material is first precisely weighed using the precise weighing pulsation duration in a precise weighing pulsation measurement mode. After a precise weighing pulsation is performed using the first precise weighing pulsation duration, under a first set condition, the first precise weighing pulsation duration to be used for a next precise weighing pulsation is obtained based on the measurement surplus value and the first precise weighing pulsation duration used for the current precise weighing pulsation. The first set condition includes that, after a first stable time has passed, the measurement surplus value is greater than a maximum allowable error of the target measurement value. The obtaining of the first precise weighing pulsation duration to be adopted in the next precise weighing pulsation based on the metering surplus value and the first precise weighing pulsation duration adopted in the current precise weighing pulsation includes: obtaining the product of the metering value of the feed and the preset number of pulsations during each precise weighing pulsation; obtaining an adjustment coefficient based on a ratio of the metering surplus value to the product; and obtaining the first precise weighing pulsation duration to be adopted in the next precise weighing pulsation based on the adjustment coefficient and the first precise weighing pulsation duration adopted in the current precise weighing pulsation.

2. The metering control method according to claim 1, characterized in that: Before obtaining the metering residual value based on the target metering value of the material in the current batch and the actual metering value obtained in real time by the metering device, the method further includes: Based on a user input operation, a metering strategy selected from the first metering strategy and a second metering strategy is determined, wherein the value of the target parameter in the second metering strategy is a fixed value.

3. The metering control method according to claim 1, characterized in that: Also includes: During the precise weighing process, when the residual measurement value is in the second measurement value interval, the material is subjected to a second precise weighing in a continuous feeding manner; the upper limit of the second measurement value interval is the first threshold value, and the lower limit is the second threshold value; the upper limit of the first measurement value interval is the second threshold value, and the lower limit is the third threshold value, and the second threshold value is a fine setting value.

4. The metering control method according to claim 3, characterized in that: Also includes: When the material being measured is aggregate, during the precise weighing process, when the measurement surplus value is within the third measurement value interval, the material is subjected to a third precise weighing measurement using a precise weighing pulsation measurement method using a second precise weighing pulsation duration; the second precise weighing pulsation duration is less than the first precise weighing pulsation 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 value is a drop.

5. The metering control method according to claim 3, characterized in that: Also includes: When the material being measured is powder or water, in the first fine weighing measurement, after a fine weighing pulsation is performed using the first fine weighing pulsation duration, a rough weighing measurement for the first set duration is performed under the second set condition; the second set condition is that after the second stable time, it is determined that the metering value of the feed is zero after N consecutive fine weighing pulsations; the second threshold is the drop; and the third threshold is the maximum allowable error of the target metering value.

6. The metering control method according to claim 4 or 5, characterized in that: The target parameter also includes the detailed set value and the drop; the metering control method also includes: Obtaining a first measurement value of the material fed during the process of converting the rough weighing measurement into the fine weighing measurement, and obtaining a second measurement value of the material fed during the process of converting the second fine weighing measurement into the first fine weighing measurement; determining the detailed set value for the next batch based on the maximum allowable error of the first measurement value, the second measurement value, and the target measurement value; The drop of the next plate is determined based on the maximum allowable error between the second measurement value and the target measurement value.

7. The metering control method according to claim 6, characterized in that: Also includes: Obtaining the first measurement value based on a first feeding speed during rough weighing and a first coefficient of the current plate; and updating the first coefficient for the next batch based on the actual measurement value of the metering device and the first feeding speed, wherein the first coefficient is a ratio of the first measurement value to the first feeding speed; Obtaining the second measurement value based on the second feeding speed during precise weighing and the second coefficient of the current plate; The second coefficient of the next plate is updated based on the actual measurement value of the metering device and the second feeding speed, and the second coefficient is the ratio of the second measurement value to the second feeding speed.

8. The metering control method according to claim 3, characterized in that: The target parameter also includes the first threshold value; the metering control method further includes: When the duration of the second precise weighing is zero, the first threshold is increased based on the first increment; the first increment is a multiple of the third measurement value of the material fed during the process of converting the set increment or the rough weighing to the first precise weighing; When the duration of the second precise weighing is greater than the second set duration, the first threshold is reduced based on the first reduction amount; the first reduction amount is a multiple of the fourth measurement value of the material input during the set reduction amount or the conversion from rough weighing to the second precise weighing.

9. The metering control method according to claim 3, characterized in that: The target parameter also includes the detailed set value; the metering control method also includes: After the first precise weighing is completed, if the actual number of precise weighing pulsations in the first precise weighing is less than the first set number, the fine set value is increased based on a second increment; wherein the second increment is determined by multiplying the metered value of the feed during each precise weighing pulsation by the first number difference, and the first number difference is the difference between the first set number and the actual number; After the first precise weighing is completed, if the actual number of precise weighing pulsations in the first precise weighing is greater than the second set number, the fine set value is reduced based on a second reduction amount; wherein the second reduction amount is determined based on the product of the metering value of the feed during each precise weighing pulsation and the second number difference, the second number difference is the difference between the actual number and the second set number; the second set number is greater than the first set number.

10. A metering control system, characterized in that: include: Metering device, dual-speed metering structure and controller; the dual-speed metering structure includes a coarse weighing mechanism and a fine weighing mechanism; The controller is used to execute the metering control method according to any one of claims 1 to 9, wherein the coarse weighing mechanism and the fine weighing mechanism are simultaneously started in coarse weighing, and the fine weighing mechanism is started in fine weighing.

11. A mixing station, characterized in that: Comprising the metering control system as claimed in claim 10.

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