Method and device for controlling high-pressure roller grinding system

Abstract

The invention discloses a high-pressure roller grinding system control method and device, and the method comprises the steps: monitoring the actual buffer material level in a buffer bin and monitoring the actual metering material level in a metering bin in the operation process of a high-pressure roller grinding system; under the condition that the actual buffer material level is smaller than a preset buffer material level and the actual metering material level is within a preset metering material level range, whether the first actual material flow, the second actual material flow and the third actual material flow meet a preset balance condition or not is judged, and if not, the second actual material flow and the third actual material flow meet the preset balance condition; if yes, the actual material flow of the second belt and / or the third belt is adjusted according to the first actual material flow, so that the material flow feeding stability in the high-pressure roller grinding system is guaranteed, the reliability of the high-pressure roller grinding machine is improved, meanwhile, it is guaranteed that the efficiency of the whole process is exerted, and the working efficiency is improved. Uniformity and stability of feeding in the high-pressure roller grinding ultra-fine crushing process are guaranteed, and therefore it is guaranteed that the production efficiency of the whole mineral separation process is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing production, and particularly relates to a control method and device for a high-pressure roller mill system. Background Art

[0002] A high-pressure roller mill is an efficient crushing device, which is widely used in industries such as mines, building materials, and metallurgy. Its working principle is to carry out laminating crushing on materials through two relatively rotating high-pressure rollers. The materials generate a laminating effect under high pressure, thereby improving the crushing efficiency and reducing the energy consumption of the crushing process.

[0003] The existing high-pressure roller mill system is mainly manually operated. The complexity and uncertainty of manual operation reduce the reliability of the high-pressure roller mill, and at the same time, reduce the efficiency of the entire process. It is difficult to ensure the uniformity and stability of the feeding of the ultra-fine crushing process of the high-pressure roller mill, thereby affecting the production of the entire beneficiation process. Summary of the Invention

[0004] By providing a control method and device for a high-pressure roller mill system in an embodiment of the present application, the technical problems in the prior art that the roller milling efficiency is low and the feeding stability is low due to manual operation of the high-pressure roller mill system are solved, and the technical effects of improving the reliability, roller milling efficiency, feeding uniformity and stability of the high-pressure roller mill are achieved.

[0005] In a first aspect, the present application provides a control method for a high-pressure roller mill system. The high-pressure roller mill system includes a storage bin, a buffer bin, a metering bin, a roller mill, a screening bin, and a fine powder sieve. The method includes:

[0006] During the operation of the high-pressure roller mill system, monitor the actual buffer material level in the buffer bin and the actual metering material level in the metering bin;

[0007] When the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, obtain the first actual material flow rate of the first belt between the roller mill and the screening bin, the second actual material flow rate of the second belt between the storage bin and the raw material intersection position, and the third actual material flow rate of the third belt between the fine powder sieve and the raw material intersection position; the raw material intersection position refers to the material confluence position of the third belt and the second belt;

[0008] When the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition, adjust the actual material flow rate of the second belt and / or the third belt according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0009] Further, when the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition, adjusting the actual material flow rate of the second belt and / or the third belt according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition includes:

[0010] When the difference between the first actual material flow rate and the actual sum value exceeds the preset difference range, it is determined that the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition; the actual sum value refers to the sum of the second actual material flow rate and the third actual material flow rate;

[0011] When the first actual material flow rate is greater than the actual sum value, controlling the transportation speed of the second belt and / or the third belt to increase until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition;

[0012] When the first actual material flow rate is less than the actual sum value, controlling the transportation speed of the second belt and / or the third belt to decrease until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0013] Further, when the actual buffer material level is greater than the warning buffer material level, the method further includes:

[0014] When the number of buffer bins in the high-pressure roller mill system is 1, controlling the second belt to stop running until the actual buffer material level is less than the preset buffer material level, and then controlling the second belt to start running; the warning buffer material level is greater than the preset buffer material level.

[0015] Further, when the actual buffer material level is greater than or equal to the limit buffer material level, the method further includes:

[0016] When the number of buffer bins in the high-pressure roller mill system is 1, controlling the fourth belt between the raw material convergence position and the buffer bin to stop running until the actual buffer material level is less than the preset buffer material level, and then controlling the fourth belt to start running; the limit buffer material level is greater than the preset buffer material level.

[0017] Further, when the actual buffer material level is greater than the warning buffer material level, the method further includes:

[0018] When the number of the buffer bins in the high-pressure roller grinding system exceeds 1, if the actual buffer material levels of all the buffer bins are greater than the warning buffer material level, control the second belt to stop running until the actual buffer material level of at least one buffer bin is less than the preset buffer material level, and then control the second belt to start running; the warning buffer material level is greater than the preset buffer material level.

[0019] Further, when the actual buffer material level is greater than or equal to the limit buffer material level, the method further includes:

[0020] When the number of the buffer bins in the high-pressure roller grinding system exceeds 1, if there is at least one target buffer bin with the actual buffer material level less than the limit buffer material level, control the fourth belt between the raw material intersection position and the buffer bin to transport the material to the target buffer bin; the limit buffer material level is greater than the preset buffer material level;

[0021] When the number of the buffer bins in the high-pressure roller grinding system exceeds 1, if the actual buffer material levels of all the buffer bins are greater than or equal to the limit buffer material level, control the fourth belt to stop running until the actual buffer material level of at least one buffer bin is less than the preset buffer material level, and then control the fourth belt to start running.

[0022] Further, when the actual buffer material level is greater than or equal to the limit buffer material level, the method further includes:

[0023] Control the third belt to stop running after the belt is emptied until the actual buffer material level is less than the preset buffer material level, and then control the fourth belt to start running.

[0024] Further, when the actual metering material level is not within the preset metering material level range, the method further includes:

[0025] When the actual metering material level is less than the lower limit metering material level, control the gate valve of the high-pressure roller grinding system to close until the actual metering material level is greater than the reference metering material level. First, control the on-off valve of the high-pressure roller grinding system to close, and then control the gate valve to open; the reference metering material level is within the preset metering material level range, and the lower limit metering material level is less than the minimum metering material level of the preset metering material level range.

[0026] Further, when the actual metering material level is not within the preset metering material level range, the method further includes:

[0027] When the actual measured material level is greater than the upper limit measured material level, control the fifth belt between the buffer bin and the metering bin to stop running until the actual measured material level is within the pre-designed measured material level range, and then control the fifth belt to run; the upper limit measured material level is greater than the maximum measured material level within the pre-designed measured material level range.

[0028] In a second aspect, the present application provides a control device for a high-pressure roller mill system. The high-pressure roller mill system includes an ore storage bin, a buffer bin, a metering bin, a roller mill, a screening bin, and a fine powder sieve. The device includes:

[0029] A material level monitoring module for monitoring the actual buffer material level in the buffer bin and the actual measured material level in the metering bin during the operation of the high-pressure roller mill system.

[0030] A flow rate acquisition module for acquiring the first actual material flow rate of the first belt between the roller mill and the screening bin, the second actual material flow rate of the second belt between the ore storage bin and the raw material convergence position, and the third actual material flow rate of the third belt between the fine powder sieve and the raw material convergence position when the actual buffer material level is less than the preset buffer material level and the actual measured material level is within the pre-designed measured material level range; the raw material convergence position refers to the material convergence position of the third belt and the second belt.

[0031] An adjustment control module for adjusting the actual material flow rate of the second belt and / or the third belt according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition when the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition.

[0032] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0033] In the process of the operation of the high-pressure roller grinding system in the embodiment of the present application, the actual buffer material level in the buffer bin is monitored, and the actual metering material level in the metering bin is monitored; when the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, it is judged whether the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition. If not, the actual material flow rate of the second belt and / or the third belt is adjusted according to the first actual material flow rate to ensure the feeding stability of the material flow rate in the high-pressure roller grinding system, improve the reliability of the high-pressure roller mill, and at the same time ensure the exertion of the efficiency of the entire process, ensure the uniformity and stability of the feeding in the high-pressure roller super-fine crushing process, and further ensure a higher production efficiency of the entire beneficiation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 The structural schematic diagram of a high-pressure roller grinding system provided by the embodiment of the present application;

[0036] Figure 2 The structural schematic diagram of another high-pressure roller grinding system provided by the embodiment of the present application;

[0037] Figure 3 The flowchart of a control method for a high-pressure roller grinding system provided by the embodiment of the present application;

[0038] Figure 4 The structural schematic diagram of a control device for a high-pressure roller grinding system provided by the embodiment of the present application.

[0039] Reference Signs:

[0040] 1 - ore storage bin, 2 - buffer bin, 21 - buffer bin, 22 - buffer bin, 3 - metering bin, 31 - metering bin, 32 - metering bin, 4 - roller mill, 41 - roller mill, 42 - roller mill, 5 - screening bin, 6 - fine powder sieve, 7 - first belt, 8 - second belt, 9 - third belt, 10 - fourth belt, 11 - fifth belt, 111 - fifth belt, 112 - fifth belt, 12 - under-screen belt, 13 - raw material intersection position, 14 - gate valve, 141 - gate valve, 142 - gate valve, 15 - opening valve, 151 - opening valve, 152 - opening valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] Embodiments of the present application provide a control method for a high-pressure roller mill system, which solves the technical problems in the prior art that manual operation of the high-pressure roller mill system results in low roller grinding efficiency and low feeding stability.

[0042] The technical solution of the embodiments of the present application for solving the above technical problems is generally as follows:

[0043] During the operation of the high-pressure roller mill system in the embodiments of the present application, the actual buffer material level in the buffer bins 2, 21, 22 is monitored, and the actual metering material level in the metering bins 3, 31, 32 is monitored; when the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, it is determined whether the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition. If not, the actual material flow rate of the second belt 8 and / or the third belt 9 is adjusted according to the first actual material flow rate to ensure the feeding stability of the material flow rate in the high-pressure roller mill system, improve the reliability of the high-pressure roller mills 4, 41, 42, and at the same time ensure the full play of the efficiency of the entire process, ensure the uniformity and stability of the feeding in the high-pressure roller mill ultra-fine crushing process, and thus ensure higher production efficiency of the entire beneficiation process.

[0044] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0045] First, it should be noted that the term "and / or" appearing in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0046] Such as Figure 1As shown in the figure, it is a schematic structural diagram of a high-pressure roller grinding system provided by an embodiment of the present application, including a mineral storage bin 1, buffer bins 2, 21, 22, metering bins 3, 31, 32, roller mills 4, 41, 42, gate valves 14, 141, 142, opening valves 15, 151, 152, a screening bin 5, a fine powder sieve 6 and other equipment. A belt is also arranged between the equipment to transport materials. The mineral storage bin 1 is used to store materials such as ores. The second belt 8 transports the materials in the mineral storage bin 1 to the fourth belt 10 and then conveys them to the buffer bins 2, 21, 22 for buffering. The fifth belts 11, 111, 112 transport the materials in the buffer bins 2, 21, 22 to the metering bins 3, 31, 32. The materials in the metering bins 3, 31, 32 reach the roller mills 4, 41, 42 after passing through the gate valves 14, 141, 142 and the opening valves 15, 151, 152, and the materials are crushed by the roller mills 4, 41, 42. The crushed materials are transported to the screening bin 5 through the first belt 7. The materials in the screening bin 5 then enter the fine powder sieve 6, and the fine powder sieve 6 transports the materials with qualified particle sizes to the next production equipment through the undersize belt 12. The fine powder sieve 6 transports the larger materials with unqualified particle sizes to the third belt 9 and conveys them to the fourth belt 10, and then mixes them with the materials in the mineral storage bin 1 conveyed by the second belt 8 for crushing operations.

[0047] Figure 1 In the high-pressure roller grinding system shown in the figure, the number of buffer bins 2, 21, 22, the fifth belts 11, 111, 112, metering bins 3, 31, 32, gate valves 14, 141, 142, opening valves 15, 151, 152 and roller mills 4, 41, 42 is one each, constituting a set of roller grinding subsystems. In addition, there can be multiple sets of roller grinding subsystems, such as Figure 2 As shown in the figure, there can be two sets of roller grinding subsystems. The crushing processes of the two sets of roller grinding subsystems are similar to that of a set of roller grinding subsystems. Specifically, reference can be made to the corresponding crushing process in the foregoing Figure 1 and this application will not elaborate on it here.

[0048] An embodiment of the present application provides a control method for a high-pressure roller grinding system as shown in Figure 3 the figure. The high-pressure roller grinding system includes a mineral storage bin 1, buffer bins 2, 21, 22, metering bins 3, 31, 32, roller mills 4, 41, 42, a screening bin 5 and a fine powder sieve 6. The method includes step S31-step S33.

[0049] Step S31, during the operation of the high-pressure roller grinding system, monitor the actual buffer material level in the buffer bins 2, 21, 22, and monitor the actual metering material level in the metering bins 3, 31, 32;

[0050] Step S32: When the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, obtain the first actual material flow rate of the first belt 7 between the roller mills 4, 41, 42 and the screening bin 5, the second actual material flow rate of the second belt 8 between the ore storage bin 1 and the raw material confluence position 13, and the third actual material flow rate of the third belt 9 between the fine powder sieve 6 and the raw material confluence position 13; the raw material confluence position 13 refers to the material confluence position of the third belt 9 and the second belt 8.

[0051] Step S33: When the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition, adjust the actual material flow rate of the second belt 8 and / or the third belt 9 according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0052] A control method for a high-pressure roller grinding system provided by an embodiment of the present application can be executed by a controller of the high-pressure roller grinding system.

[0053] Regarding step S31, during the operation of the high-pressure roller grinding system, monitor the actual buffer material level in the buffer bins 2, 21, 22 and monitor the actual metering material level in the metering bins 3, 31, 32.

[0054] During the operation of the high-pressure roller grinding system, the actual buffer material level in the buffer bins 2, 21, 22 can be detected in real time by the level detection sensors of the buffer bins 2, 21, 22, and the actual metering material level in the metering bins 3, 31, 32 can be detected in real time by the level detection sensors of the metering bins 3, 31, 32. The real time mentioned in the embodiments of the present application can be collected at a certain frequency, for example, once every 1 minute.

[0055] The embodiments of the present application set several buffer material level thresholds to determine whether the actual buffer material level in the buffer bins 2, 21, 22 is appropriate, and then take corresponding control measures. Among them, the buffer material level thresholds at least include a preset buffer material level, a warning buffer material level, and an extreme buffer material level. The sizes of the preset buffer material level, the warning buffer material level, and the extreme buffer material level increase in sequence. For example, if the maximum height of the material level in the buffer bins 2, 21, 22 is 6 meters, then the preset buffer material level can be 4.8 - 5.2 meters, the warning buffer material level can be 5.4 - 5.6 meters, and the extreme buffer material level can be 5.8 - 6 meters. Preferably, the preset buffer material level can be 5 meters, the warning buffer material level can be 5.5 meters, and the extreme buffer material level can be 6 meters.

[0056] When the actual buffer material level is less than the preset buffer material level, it means that the buffer material level is not too high and is in a better state. When the actual buffer material level is greater than the warning buffer material level, it means that there is a possibility of the material level in the buffer bins 2, 21, 22 being full. When the actual buffer material level is greater than or equal to the limit buffer material level, it means that the buffer bins 2, 21, 22 are already full. The control strategies for different situations of the actual buffer material level will be described later, and thus will not be elaborated here.

[0057] Similarly, in the embodiments of the present application, several metering material level thresholds are set to determine whether the actual metering material level in the metering bins 3, 31, 32 is appropriate, and then corresponding control measures are taken. Among them, the metering material level thresholds at least include the lower limit metering material level, the minimum metering material level, the reference metering material level, the maximum metering material level, and the upper limit metering material level. The sizes of the lower limit metering material level, the minimum metering material level, the reference metering material level, the maximum metering material level, and the upper limit metering material level increase in sequence. For example, according to the height percentage of the metering bins 3, 31, 32, each metering material level threshold is determined. The lower limit metering material level can be 8%-12%, the minimum metering material level can be 18%-22%, the reference metering material level can be 30%-60%, the maximum metering material level can be 78%-84%, and the upper limit metering material level can be 84%-99%. Preferably, the lower limit metering material level can be 10%, the minimum metering material level can be 20%, the reference metering material level can be 40%, the maximum metering material level can be 80%, and the upper limit metering material level can be 90%.

[0058] The range corresponding to the minimum metering material level and the maximum metering material level is denoted as the preset metering material level range. When the actual metering material level in the metering bins 3, 31, 32 is within this preset metering material level range, it means that the material level in the metering bins 3, 31, 32 is appropriate.

[0059] When the actual metering material level is less than the lower limit metering material level, it means that the material level is too low, resulting in insufficient feeding pressure of the metering bins 3, 31, 32 to the roller mills 4, 41, 42, and the crushing effect is poor. Then, the gate valves 14, 141, 142 need to be closed to prevent the material from flowing into the roller mills 4, 41, 42 continuously. When the actual metering material level returns to the reference metering material level again, the opening valves 15, 151, 152 are closed and the gate valves 14, 141, 142 are opened to allow the material to flow into the roller mills 4, 41, 42 again for crushing operations. When the actual metering material level exceeds the upper limit metering material level, it means that the material level is too high and there may be a risk of overflowing the full bin. Therefore, the amount of material flowing into the metering bins 3, 31, 32 needs to be reduced. The control strategies for different situations of the actual metering material level will be described later, and thus will not be elaborated here.

[0060] The situation where the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range is described as follows.

[0061] Regarding step S32, when the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, obtain the first actual material flow rate of the first belt 7 between the roller mills 4, 41, 42 and the screening bin 5, the second actual material flow rate of the second belt 8 between the ore storage bin 1 and the raw material intersection position 13, and the third actual material flow rate of the third belt 9 between the fine powder sieve 6 and the raw material intersection position 13; the raw material intersection position 13 refers to the material confluence position of the third belt 9 and the second belt 8.

[0062] When the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, it means that the material levels of the metering bins 3, 31, 32 and the buffer bins 2, 21, 22 are all in a relatively appropriate state. In this state, the material stability of the entire high-pressure roller grinding system is mainly controlled.

[0063] In the embodiment of the present application, the second actual material flow rate corresponding to the second belt 8 and the third actual material flow rate corresponding to the third belt 9 are obtained, and the first actual material flow rate corresponding to the first belt 7 is obtained. It can be seen that the first actual material flow rate is the material outflow rate in the entire high-pressure roller grinding subsystem (including equipment such as the buffer bins 2, 21, 22, the fifth belts 11, 111, 112, the metering bins 3, 31, 32, the gate valves 14, 141, 142, the opening valves 15, 151, 152, and the roller mills 4, 41, 42), while the second actual material flow rate and the third actual material flow rate are the material inflow rates in the entire high-pressure roller grinding subsystem.

[0064] Based on the material outflow rate and the material inflow rate, it can be determined whether the material flow rate of the high-pressure roller grinding subsystem is stable. In the embodiment of the present application, a preset balance condition is set to determine whether the material flow rate of the high-pressure roller grinding subsystem is stable. The preset balance condition means that the difference between the first actual material flow rate and the actual sum value does not exceed the preset difference range, where the actual sum value is the sum of the second actual material flow rate and the third actual material flow rate. The preset difference range can be set according to actual needs. When the stability requirement for the high-pressure roller grinding subsystem is high, a smaller threshold is used as the preset difference range. However, this means a higher control frequency of the control system, which may have a negative impact on the service life of related equipment and higher energy consumption. When the stability requirement for the high-pressure roller grinding subsystem is low, a larger threshold is used as the preset difference range, which means a lower control frequency of the control system, has a positive impact on the service life of related equipment, and lower energy consumption.

[0065] When the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition, there is no need to adjust the equipment in the high-pressure roller grinding system, and only step S31 needs to be continuously executed until the crushing operation ends or until the condition of step S32 is not met.

[0066] Regarding step S33, when the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition, adjust the actual material flow rate of the second belt 8 and / or the third belt 9 according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0067] When the difference between the first actual material flow rate and the actual sum value exceeds the preset difference range, it is determined that the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition; the actual sum value refers to the sum of the second actual material flow rate and the third actual material flow rate.

[0068] When the first actual material flow rate is greater than the actual sum value, it means that the material outflow rate of the roller grinding subsystem is relatively large. Then, the material levels of the buffer bins 2, 21, 22 and the metering bins 3, 31, 32 may gradually decrease. If it is necessary to ensure that the material levels of the buffer bins 2, 21, 22 and the metering bins 3, 31, 32 continue to tend to remain at a reasonable level, then control the transportation speed of the second belt 8 and / or the third belt 9 to increase until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0069] When the first actual material flow rate is less than the actual sum value, it means that the material outflow rate of the roller grinding subsystem is relatively small. Then, the material levels of the buffer bins 2, 21, 22 and the metering bins 3, 31, 32 may gradually increase. If it is necessary to ensure that the material levels of the buffer bins 2, 21, 22 and the metering bins 3, 31, 32 continue to tend to remain at a reasonable level, then control the transportation speed of the second belt 8 and / or the third belt 9 to decrease until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0070] It should be noted that the premise for discussing whether the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition is that the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range.

[0071] In summary, during the operation of the high-pressure roller grinding system in the embodiments of the present application, the actual buffer material level in the buffer bins 2, 21, 22 is monitored, and the actual metering material level in the metering bins 3, 31, 32 is monitored; when the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, it is determined whether the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition. If not, the actual material flow rate of the second belt 8 and / or the third belt 9 is adjusted according to the first actual material flow rate to ensure the feeding stability of the material flow rate in the high-pressure roller grinding system, improve the reliability of the high-pressure roller mills 4, 41, 42, and at the same time ensure the exertion of the efficiency of the entire process, ensure the uniformity and stability of the feeding in the high-pressure roller super-fine crushing process, and further ensure higher production efficiency of the entire beneficiation process.

[0072] Now, the subsequent control strategies provided by the embodiments of the present application will be described from two perspectives of the actual buffer material level and the actual metering material level respectively. It should be noted that the subsequent control strategies for the actual buffer material level and the actual metering material level can be used in combination or separately, and can be specifically selected according to the actual situation.

[0073] Furthermore, as Figure 1 and Figure 2 shown, the number of high-pressure roller grinding subsystems can be 1 set, 2 sets, or more sets. The control strategies for 1 set of high-pressure roller grinding subsystems are different from those for more than 1 set of high-pressure roller grinding subsystems. Therefore, the subsequent control strategies provided by the embodiments of the present application will be described from the perspectives of 1 set of high-pressure roller grinding subsystems and more than 1 set of high-pressure roller grinding subsystems respectively.

[0074] Now, in combination with Figure 1 , the control strategies related to the buffer bins 2, 21, 22 of 1 set of high-pressure roller grinding subsystems will be described as follows.

[0075] When the number of the buffer bins 2, 21, 22 in the high-pressure roller mill system is 1, and when the actual buffer material level is greater than the warning buffer material level, it means that the material level in the buffer bins 2, 21, 22 is too high and there is a possibility of full bins. Then, control the second belt 8 to stop running to prevent the materials in the ore storage bin 1 from continuously transporting to the buffer bins 2, 21, 22, and only allow the materials on the third belt 9 and the residual materials on the fourth belt 10 to transport to the buffer bins 2, 21, 22, reducing the materials flowing into the buffer bins 2, 21, 22. The materials in the buffer bins 2, 21, 22 gradually flow into the metering bins 3, 31, 32, and the material level gradually decreases until the actual buffer material level is less than the preset buffer material level, then control the second belt 8 to start running, and then continue to allow the materials in the ore storage bin 1 to continuously transport to the buffer bins 2, 21, 22. The warning buffer material level is greater than the preset buffer material level.

[0076] When the number of the buffer bins 2, 21, 22 in the high-pressure roller mill system is 1, and when the actual buffer material level is greater than or equal to the limit buffer material level, it means that the buffer bins 2, 21, 22 are already full. If it is necessary to reduce the amount of overflowing materials from the full bins or prevent the full-bin materials from overflowing, then control the fourth belt 10 between the raw material intersection position 13 and the buffer bins 2, 21, 22 to stop running to prevent materials from continuing to flow into the buffer bins 2, 21, 22. The materials in the buffer bins 2, 21, 22 gradually flow into the metering bins 3, 31, 32, and the material level gradually decreases until the actual buffer material level is less than the preset buffer material level, then control the fourth belt 10 to start running; the limit buffer material level is greater than the preset buffer material level.

[0077] Now, combined with Figure 2 , the control strategies related to the buffer bins 2, 21, 22 of more than 1 high-pressure roller mill subsystem are described as follows.

[0078] When the number of the buffer bins 2, 21, 22 in the high-pressure roller grinding system exceeds 1, and when the actual buffer material level is greater than the warning buffer material level, if the actual buffer material levels of all the buffer bins 2, 21, 22 are greater than the warning buffer material level, it means that the material levels of all the buffer bins 2, 21, 22 are too high and there is a possibility of being full. Further, control the second belt 8 to stop running, so as to avoid the continuous transportation of the materials in the ore storage bin 1 to each of the buffer bins 2, 21, 22, and only let the materials on the third belt 9 and the residual materials on the fourth belt 10 be transported to each of the buffer bins 2, 21, 22, reduce the materials flowing into the buffer bins 2, 21, 22, and the materials in the buffer bins 2, 21, 22 gradually flow into the metering bins 3, 31, 32, and the material level gradually decreases until the actual buffer material level of at least one of the buffer bins 2, 21, 22 is less than the preset buffer material level, and then control the second belt 8 to start running; the warning buffer material level is greater than the preset buffer material level.

[0079] If there is at least 1 first target buffer bin 2, 21, 22 whose actual buffer material level is not greater than the warning buffer material level, it means that the material levels of the other buffer bins 2, 21, 22 except the first target buffer bin 2, 21, 22 are too high and there is a possibility of being full for the other buffer bins 2, 21, 22. Then, it is possible to control the fourth belt 10 not to transport materials to the other buffer bins 2, 21, 22, but control the fourth belt 10 to only transport materials to the first target buffer bin 2, 21, 22. On the one hand, it can avoid the continuous transportation of the materials in the ore storage bin 1 to the other buffer bins 2, 21, 22 and reduce the possibility of the other buffer bins 2, 21, 22 being full. On the other hand, it can also ensure that the fourth belt 10 transports materials to the first target buffer bin 2, 21, 22 and ensure the crushing efficiency of the high-pressure roller grinding subsystem where the first target buffer bin 2, 21, 22 is located. The materials in the other buffer bins 2, 21, 22 gradually flow into the metering bins 3, 31, 32, and the material level gradually decreases until the actual buffer material level of at least one of the other buffer bins 2, 21, 22 is less than the preset buffer material level, and then control the fourth belt 10 to transport materials to it. The warning buffer material level is greater than the preset buffer material level.

[0080] When the number of the buffer bins 2, 21, 22 in the high-pressure roller grinding system exceeds 1, and when the actual buffer material level is greater than or equal to the limit buffer material level, if there is at least 1 target buffer bin 2, 21, 22 whose actual buffer material level is less than the limit buffer material level, it means that the other buffer bins 2, 21, 22 except the target buffer bins 2, 21, 22 are already full. If it is necessary to reduce the amount of material overflowing from the full other buffer bins 2, 21, 22 or avoid the overflow of the full bin material, then control the fourth belt 10 between the raw material convergence position 13 and the buffer bins 2, 21, 22 to transport the material to the target buffer bins 2, 21, 22, and avoid transporting it to the other buffer bins 2, 21, 22, reducing the possibility of the other buffer bins 2, 21, 22 being full; the limit buffer material level is greater than the preset buffer material level.

[0081] When the number of the buffer bins 2, 21, 22 in the high-pressure roller grinding system exceeds 1, and when the actual buffer material level is greater than or equal to the limit buffer material level, if the actual buffer material level of each of the buffer bins 2, 21, 22 is greater than or equal to the limit buffer material level, it means that all the buffer bins 2, 21, 22 are already full. If it is necessary to reduce the amount of material overflowing from the full bin or avoid the overflow of the full bin material, then control the fourth belt 10 between the raw material convergence position 13 and the buffer bins 2, 21, 22 to stop running, avoiding the continuous inflow of material into the buffer bins 2, 21, 22. The material in the buffer bins 2, 21, 22 gradually flows into the metering bins 3, 31, 32, and the material level gradually decreases until the actual buffer material level of at least one buffer bin 2, 21, 22 is less than the preset buffer material level, and then control the fourth belt 10 to start running, so that the fourth belt 10 transports material to the buffer bins 2, 21, 22 whose actual buffer material level is less than the preset buffer material level; the limit buffer material level is greater than the preset buffer material level.

[0082] Regardless of the number of sets of the high-pressure roller grinding subsystems, when the actual buffer material level is greater than or equal to the limit buffer material level, when controlling the second belt 8, it is also necessary to control the third belt 9 to stop running after the belt is emptied until the actual buffer material level is less than the preset buffer material level, and then control the fourth belt 10 to start running. This can reduce the possibility of the buffer bins 2, 21, 22 being full due to the material transportation of the third belt 9.

[0083] Regardless of the number of sets of the high-pressure roller grinding subsystems, the control strategy for the metering bins 3, 31, 32 in each set of high-pressure roller grinding subsystems is the same, which is specifically as follows:

[0084] In the case where the actual measured material level is not within the pre-designed measured material level range, and in the case where the actual measured material level is less than the lower limit measured material level, it means that the material level in the metering bins 3, 31, 32 is too low, resulting in insufficient feeding pressure from the metering bins 3, 31, 32 to the roller mills 4, 41, 42, leading to poor crushing effect. Then, the gate valves 14, 141, 142 of the high-pressure roller mill system are controlled to close. As the fifth belts 11, 111, 112 convey the materials in the buffer bins 2, 21, 22 to the metering bins 3, 31, 32, the material level in the metering bins 3, 31, 32 gradually rises until the actual measured material level is greater than the reference measured material level. First, the on-off valves of the high-pressure roller mill system are controlled to close, and then the gate valves 14, 141, 142 are controlled to open; the reference measured material level is within the pre-designed measured material level range, and the lower limit measured material level is less than the minimum measured material level of the pre-designed measured material level range.

[0085] Among them, first controlling the opening valves 15, 151, 152 to close and then controlling the gate valves 14, 141, 142 to open can prevent the fixed rollers of the roller mills 4, 41, 42 from not rotating after being pressed.

[0086] In the case where the actual measured material level is not within the pre-designed measured material level range, and in the case where the actual measured material level is greater than the upper limit measured material level, it means that the material level is too high, and there may be a risk of overflow in the full bin. Then, the fifth belts 11, 111, 112 between the buffer bins 2, 21, 22 and the metering bins 3, 31, 32 are controlled to stop running. As the materials in the metering bins 3, 31, 32 are conveyed to the roller mills 4, 41, 42 for crushing operations, the material level in the metering bins 3, 31, 32 gradually decreases until the actual measured material level is within the pre-designed measured material level range, and then the fifth belts 11, 111, 112 are controlled to run; the upper limit measured material level is greater than the maximum measured material level of the pre-designed measured material level range.

[0087] In summary, through the precise automatic control program in the embodiments of the present application, uniform and stable feeding of materials is achieved, production efficiency and product quality are improved, manual operations are reduced, and production costs are lowered. Through the automated control program, efficient and stable feeding in the high-pressure roller milling process is realized, buffering between bins is achieved, and balanced and stable feeding is achieved through the belt scale system and the variable frequency control system of the belts, which has significant technological progress and practical application value.

[0088] Based on the same inventive concept, the embodiments of the present application provide a control device for a high-pressure roller mill system as shown in Figure 4 The high-pressure roller mill system includes an ore storage bin 1, buffer bins 2, 21, 22, metering bins 3, 31, 32, roller mills 4, 41, 42, a screening bin 5, and a fine powder sieve 6. The device includes:

[0089] A material level monitoring module 411 is configured to monitor the actual buffer material level in the buffer bins 2, 21, 22 and the actual metering material level in the metering bins 3, 31, 32 during the operation of the high-pressure roller mill system.

[0090] A flow rate acquisition module 412 is configured to, when the actual buffer material level is less than a preset buffer material level and the actual metering material level is within a preset metering material level range, acquire the first actual material flow rate of the first belt 7 between the roller mills 4, 41, 42 and the screening bin 5, the second actual material flow rate of the second belt 8 between the ore storage bin 1 and the raw material convergence position 13, and the third actual material flow rate of the third belt 9 between the fine powder sieve 6 and the raw material convergence position 13; the raw material convergence position 13 refers to the material convergence position of the third belt 9 and the second belt 8.

[0091] An adjustment control module 413 is configured to, when the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet a preset balance condition, adjust the actual material flow rate of the second belt 8 and / or the third belt 9 according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0092] Further, the adjustment control module 413 is configured to:

[0093] When the difference between the first actual material flow rate and the actual sum value exceeds a preset difference range, determine that the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition; the actual sum value refers to the sum of the second actual material flow rate and the third actual material flow rate.

[0094] When the first actual material flow rate is greater than the actual sum value, control the transportation speed of the second belt 8 and / or the third belt 9 to increase until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0095] When the first actual material flow rate is less than the actual sum value, control the transportation speed of the second belt 8 and / or the third belt 9 to decrease until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

[0096] Further, the adjustment control module 413 is configured to:

[0097] When the actual buffer material level is greater than the warning buffer material level, and when the number of buffer bins 2, 21, 22 in the high-pressure roller mill system is 1, control the second belt 8 to stop running until the actual buffer material level is less than the preset buffer material level, and then control the second belt 8 to start running; the warning buffer material level is greater than the preset buffer material level.

[0098] Further, the adjustment control module 413 is configured to:

[0099] When the actual buffer material level is greater than or equal to the limit buffer material level, and when the number of buffer bins 2, 21, 22 in the high-pressure roller mill system is 1, control the fourth belt 10 between the raw material intersection position 13 and the buffer bins 2, 21, 22 to stop running until the actual buffer material level is less than the preset buffer material level, and then control the fourth belt 10 to start running; the limit buffer material level is greater than the preset buffer material level.

[0100] Further, the adjustment control module 413 is configured to:

[0101] When the actual buffer material level is greater than the warning buffer material level, and when the number of buffer bins 2, 21, 22 in the high-pressure roller mill system exceeds 1, if the actual buffer material levels of all the buffer bins 2, 21, 22 are greater than the warning buffer material level, control the second belt 8 to stop running until the actual buffer material level of at least one of the buffer bins 2, 21, 22 is less than the preset buffer material level, and then control the second belt 8 to start running; the warning buffer material level is greater than the preset buffer material level.

[0102] Further, the adjustment control module 413 is configured to:

[0103] When the actual buffer material level is greater than or equal to the limit buffer material level, and when the number of buffer bins 2, 21, 22 in the high-pressure roller mill system exceeds 1, if there is at least one target buffer bin 2, 21, 22 with an actual buffer material level less than the limit buffer material level, control the fourth belt 10 between the raw material intersection position 13 and the buffer bins 2, 21, 22 to transport the material to the target buffer bin 2, 21, 22; the limit buffer material level is greater than the preset buffer material level.

[0104] When the number of the buffer bins 2, 21, 22 in the high-pressure roller mill system exceeds 1, if the actual buffer material levels of all the buffer bins 2, 21, 22 are greater than or equal to the limit buffer material level, control the fourth belt 10 to stop running until the actual buffer material level of at least one of the buffer bins 2, 21, 22 is less than the preset buffer material level, and then control the fourth belt 10 to start running.

[0105] Further, the adjustment control module 413 is configured to:

[0106] When the actual buffer material level is greater than or equal to the limit buffer material level, control the third belt 9 to stop running after the belt is emptied until the actual buffer material level is less than the preset buffer material level, and then control the fourth belt 10 to start running.

[0107] Further, the adjustment control module 413 is configured to:

[0108] When the actual metering material level is not within the preset metering material level range, and when the actual metering material level is less than the lower limit metering material level, control the gate valves 14, 141, 142 of the high-pressure roller mill system to close until the actual metering material level is greater than the reference metering material level. First, control the on-off valve of the high-pressure roller mill system to close, and then control the gate valves 14, 141, 142 to open; the reference metering material level is within the preset metering material level range, and the lower limit metering material level is less than the minimum metering material level of the preset metering material level range.

[0109] Further, the adjustment control module 413 is configured to:

[0110] When the actual metering material level is not within the preset metering material level range, and when the actual metering material level is greater than the upper limit metering material level, control the fifth belts 11, 111, 112 between the buffer bins 2, 21, 22 and the metering bins 3, 31, 32 to stop running until the actual metering material level is within the preset metering material level range, and then control the fifth belts 11, 111, 112 to run; the upper limit metering material level is greater than the maximum metering material level of the preset metering material level range.

[0111] Since the electronic device introduced in this embodiment is the one used to implement the information processing method in the embodiments of the present application, based on the information processing method introduced in the embodiments of the present application, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device implements the method in the embodiments of the present application will not be described in detail here. As long as the electronic device used by those skilled in the art to implement the information processing method in the embodiments of the present application falls within the scope protected by the present application.

[0112] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0113] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the specified functions in Figure 1 one or more of the flows Figure 1 or blocks or a combination of multiple flows and / or blocks.

[0114] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the specified functions in Figure 1 one or more of the flows Figure 1 or blocks or a combination of multiple flows and / or blocks.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide means for implementing the specified functions in Figure 1 one or more of the flows Figure 1Steps of the functions specified in one or more boxes.

[0116] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0117] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A control method for a high-pressure roller grinding system, characterized in that The high-pressure roller grinding system includes an ore storage bin, a buffer bin, a metering bin, a roller mill, a screening bin, and a fine powder sieve. The method includes: During the operation of the high-pressure roller grinding system, monitoring the actual buffer material level in the buffer bin and the actual metering material level in the metering bin; When the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range, obtaining the first actual material flow rate of the first belt between the roller mill and the screening bin, the second actual material flow rate of the second belt between the ore storage bin and the raw material intersection position, and the third actual material flow rate of the third belt between the fine powder sieve and the raw material intersection position; the raw material intersection position refers to the material confluence position of the third belt and the second belt; When the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition, adjusting the actual material flow rate of the second belt and / or the third belt according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

2. The control method of a high-pressure roller grinding system according to claim 1, wherein The step of adjusting the actual material flow rate of the second belt and / or the third belt according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition when the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition includes: When the difference between the first actual material flow rate and the actual sum value exceeds the preset difference range, determining that the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition; the actual sum value refers to the sum of the second actual material flow rate and the third actual material flow rate; When the first actual material flow rate is greater than the actual sum value, controlling the transport speed of the second belt and / or the third belt to increase until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition; When the first actual material flow rate is less than the actual sum value, controlling the transport speed of the second belt and / or the third belt to decrease until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition.

3. The control method of a high-pressure roll grinding system according to claim 1, characterized in that When the actual buffer material level is greater than the warning buffer material level, the method further includes: When the number of buffer bins in the high-pressure roller grinding system is 1, controlling the second belt to stop running until the actual buffer material level is less than the preset buffer material level, and then controlling the second belt to start running; the warning buffer material level is greater than the preset buffer material level.

4. A control method for a high-pressure roll grinding system according to claim 1 or 3, characterized in that When the actual buffer material level is greater than or equal to the limit buffer material level, the method further includes: When the number of the buffer bins in the high-pressure roller grinding system is 1, control the fourth belt between the raw material intersection position and the buffer bin to stop running until the actual buffer material level is less than the preset buffer material level, and then control the fourth belt to start running; the limit buffer material level is greater than the preset buffer material level.

5. The control method of a high-pressure roller grinding system according to claim 1, characterized in that, When the actual buffer material level is greater than the warning buffer material level, the method further includes: When the number of the buffer bins in the high-pressure roller grinding system exceeds 1, if the actual buffer material levels of all the buffer bins are greater than the warning buffer material level, control the second belt to stop running until the actual buffer material level of at least one buffer bin is less than the preset buffer material level, and then control the second belt to start running; the warning buffer material level is greater than the preset buffer material level.

6. The control method of a high-pressure roll grinding system according to claim 1 or 5, characterized in that When the actual buffer material level is greater than or equal to the limit buffer material level, the method further includes: When the number of the buffer bins in the high-pressure roller grinding system exceeds 1, if there is at least one target buffer bin with the actual buffer material level less than the limit buffer material level, control the fourth belt between the raw material intersection position and the buffer bin to transport the material to the target buffer bin; the limit buffer material level is greater than the preset buffer material level; When the number of the buffer bins in the high-pressure roller grinding system exceeds 1, if the actual buffer material levels of all the buffer bins are greater than or equal to the limit buffer material level, control the fourth belt to stop running until the actual buffer material level of at least one buffer bin is less than the preset buffer material level, and then control the fourth belt to start running.

7. The control method of a high-pressure roll grinding system according to claim 1, characterized in that When the actual buffer material level is greater than or equal to the limit buffer material level, the method further includes: Control the third belt to stop running after the belt is emptied until the actual buffer material level is less than the preset buffer material level, and then control the fourth belt to start running.

8. A control method for a high-pressure roller grinding system according to claim 1, characterized in that, When the actual metering material level is not within the preset metering material level range, the method further includes: When the actual metering material level is less than the lower limit metering material level, control the gate valve of the high-pressure roller grinding system to close until the actual metering material level is greater than the reference metering material level. First, control the on-off valve of the high-pressure roller grinding system to close, and then control the gate valve to open; the reference metering material level is within the preset metering material level range, and the lower limit metering material level is less than the minimum metering material level of the preset metering material level range.

9. The control method of a high-pressure roller grinding system according to claim 1 or 8, characterized in that, When the actual metering material level is not within the preset metering material level range, the method further includes: When the actual metering material level is greater than the upper limit metering material level, control the fifth belt between the buffer bin and the metering bin to stop running until the actual metering material level is within the preset metering material level range, and then control the fifth belt to run; the upper limit metering material level is greater than the maximum metering material level of the preset metering material level range.

10. A control device for a high-pressure roll grinding system, characterized in that, The high-pressure roller grinding system includes an ore storage bin, a buffer bin, a metering bin, a roller mill, a screening bin, and a fine powder sieve, and the device includes: The material level monitoring module is used to monitor the actual buffer material level in the buffer bin and the actual metering material level in the metering bin during the operation of the high-pressure roller mill system; The flow rate acquisition module is used to acquire the first actual material flow rate of the first belt between the roller mill and the screening bin, the second actual material flow rate of the second belt between the ore storage bin and the raw material convergence position, and the third actual material flow rate of the third belt between the fine powder sieve and the raw material convergence position when the actual buffer material level is less than the preset buffer material level and the actual metering material level is within the preset metering material level range; the raw material convergence position refers to the material convergence position of the third belt and the second belt; The adjustment control module is used to adjust the actual material flow rate of the second belt and / or the third belt according to the first actual material flow rate until the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate meet the preset balance condition when the first actual material flow rate, the second actual material flow rate, and the third actual material flow rate do not meet the preset balance condition.

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