Negative pressure conveying control system and method

Abstract

The invention relates to the technical field of material conveying equipment, and discloses a negative pressure conveying control system and method. One temporary storage bin is connected with the output end of one vibrating screen; the first material level device is arranged on the upper portion of the temporary storage bin, and the second material level device is arranged on the lower portion of the temporary storage bin; each output pipe is communicated with the bottom of the corresponding temporary storage bin; a feeding hole of each vacuum feeding machine is respectively communicated with the output pipe; each stock bin is communicated with the output end of the corresponding vacuum feeding machine; the dust removal tank is communicated with the top of the vacuum feeding machine; the Roots blower is communicated with the dust removal tank; a pneumatic butterfly valve; and the control module is connected with the first material level device, the second material level device, the pneumatic butterfly valve and the Roots blower. Material conveying is free of pollution, cross contamination of the materials is avoided, the conveying efficiency meets the capacity requirement, and the quality meets the requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of feeding equipment, and more particularly, to a negative pressure conveying control system and method. Background Art

[0002] When feeding in the prior art, materials are discharged from a vibrating screen into a buffer bin, and then conveyed by a bucket elevator and distributed by a rotary distributor. Some materials absorb moisture and fall on the chain, resulting in the product turning black and falling into the product again. Or when producing other colored products, the bucket elevator needs to be cleaned, but it is very difficult to clean thoroughly, resulting in residual materials contaminating other products and causing unqualified product quality. At the same time, it is also very difficult to completely clean the rotary distributor, and there will be material residues, resulting in cross-contamination of different products.

[0003] In the prior art, the bucket elevator equipment conveys hoppers by chains, and the materials are easily contaminated by the chains, resulting in unqualified product quality; the bucket elevator and the rotary distributor are difficult to clean, with many dead corners, and the residual materials will contaminate the production of other products, resulting in unqualified product quality. At the same time, cleaning will also affect production efficiency.

[0004] Therefore, it is necessary to provide a negative pressure conveying control system and method to solve the problems of chain contamination of materials, difficult thorough cleaning, affecting product quality and low efficiency existing in the existing feeding equipment. Summary of the Invention

[0005] In view of this, the present invention provides a negative pressure conveying control system and method, aiming to solve the problems of chain contamination of materials, difficult thorough cleaning, affecting product quality and low efficiency existing in the existing feeding equipment.

[0006] On the one hand, the present invention provides a negative pressure conveying control system, including:

[0007] A vibrating screen for screening materials;

[0008] A plurality of buffer bins, one of the buffer bins being connected to the output end of one of the vibrating screens;

[0009] A first level gauge and a second level gauge, both including a plurality of them, the first level gauge being arranged at the upper part of the buffer bin, and the second level gauge being arranged at the lower part of the buffer bin;

[0010] Output pipes, including a plurality of them, each output pipe being communicated with the bottom of each buffer bin;

[0011] Vacuum loading machines, including a plurality of them, the feeding port of each vacuum loading machine being respectively communicated with the output pipe;

[0012] Silos, including a plurality of them, each silo being communicated with the output end of each vacuum loading machine;

[0013] A dust removal tank, which is respectively communicated with the top of the vacuum feeder;

[0014] A Roots blower, which is communicated with the dust removal tank;

[0015] A number of pneumatic butterfly valves are provided, and the pneumatic butterfly valves are respectively arranged on the output pipe, the feed inlet of the vacuum feeder, the output end of the vacuum feeder, and the connection between the dust removal tank and the vacuum feeder;

[0016] A control module, which is connected to the first level gauge, the second level gauge, the pneumatic butterfly valve and the Roots blower, and the control module is used to control the working states of the pneumatic butterfly valve and the Roots blower according to the first level gauge and the second level gauge.

[0017] Further, the control module includes:

[0018] An acquisition unit, which is configured to acquire the material height, the opening degree of the pneumatic butterfly valve and the rotation speed of the Roots blower;

[0019] A processing unit, which is configured to control the opening and closing of the pneumatic butterfly valve according to the material height, control the opening degree of the pneumatic butterfly valve according to the material height, judge whether to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height, and if it is judged that adjustment is needed, adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height;

[0020] The processing unit is further configured to control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve, determine the rotation speed of the Roots blower according to the opening degree of the pneumatic butterfly valve, judge whether to adjust the rotation speed of the Roots blower according to whether the opening degree of the pneumatic butterfly valve changes, and if it is judged that adjustment is needed, adjust the rotation speed of the Roots blower according to the change value of the opening degree of the pneumatic butterfly valve.

[0021] Further, when the processing unit is configured to control the opening and closing of the pneumatic butterfly valve according to the material height, it includes:

[0022] If the material height in the buffer bin is higher than the height of the first level gauge in the buffer bin, control the pneumatic butterfly valve between the buffer bin and the bin communicated with the buffer bin to open.

[0023] Further, when the processing unit is configured to control the opening degree of the pneumatic butterfly valve according to the material height, it includes:

[0024] Calculate the height difference between the material height and the height of the first level gauge, and control the opening degree of the pneumatic butterfly valve according to the height difference; wherein, if the height difference is zero, control the opening degree of the pneumatic butterfly valve to be 0.6;

[0025] Set a first height difference and a second height difference, where the first height difference is less than the second height difference, and the first height difference is greater than zero;

[0026] If the height difference value is less than or equal to the first height difference, control the opening degree of the pneumatic butterfly valve to be the first opening degree;

[0027] If the height difference value is greater than the first height difference and less than or equal to the second height difference, control the opening degree of the pneumatic butterfly valve to be the second opening degree;

[0028] If the height difference value is greater than the second height difference, control the opening degree of the pneumatic butterfly valve to be the third opening degree;

[0029] Wherein, 0.6 < the first opening degree < the second opening degree < the third opening degree ≤ 0.8.

[0030] Further, when the processing unit is configured to determine whether to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height, it includes:

[0031] Collect the historical material height change value within a unit time, and calculate the average value of the historical material height change;

[0032] If the change value of the material height within a unit time is less than the average value of the historical material height change, it is determined that the opening degree of the pneumatic butterfly valve needs to be adjusted;

[0033] If the change value of the material height within a unit time is greater than or equal to the average value of the historical material height change, it is determined that the opening degree of the pneumatic butterfly valve does not need to be adjusted.

[0034] Further, when the processing unit is configured to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height if it is determined that adjustment is needed, it includes:

[0035] Calculate the deviation rate between the change value of the material height and the average value of the historical material height change:

[0036]

[0037] In the above formula, K represents the deviation rate, △H1 represents the change value of the material height, and △H0 represents the average value of the historical material height change;

[0038] Set a first deviation rate and a second deviation rate, where the first deviation rate is greater than the second deviation rate, and the first deviation rate is less than zero;

[0039] If the deviation rate is greater than the first deviation rate, adjust the opening degree of the pneumatic butterfly valve through a first adjustment coefficient;

[0040] If the deviation rate is less than or equal to the first deviation rate and greater than or equal to the second deviation rate, the opening degree of the pneumatic butterfly valve is adjusted by the second adjustment coefficient;

[0041] If the deviation rate is less than the second deviation rate, the opening degree of the pneumatic butterfly valve is adjusted by the third adjustment coefficient;

[0042] Among them, the value range of the adjustment coefficient is: 1 < the first adjustment coefficient < the second adjustment coefficient < the third adjustment coefficient; the adjusted opening degree of the pneumatic butterfly valve is the product of the opening degree of the pneumatic butterfly valve before adjustment and the adjustment coefficient, and the maximum adjusted opening degree of the pneumatic butterfly valve is 1.

[0043] Further, the processing unit is further configured to control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve. When determining the speed of the Roots blower according to the opening degree of the pneumatic butterfly valve, it includes:

[0044] If the pneumatic butterfly valve is opened, the Roots blower is controlled to be opened;

[0045] Set an opening degree range value. If the opening degree of the pneumatic butterfly valve is less than or equal to the minimum value in the opening degree range value, the speed of the Roots blower is controlled to be the first speed;

[0046] If the opening degree of the pneumatic butterfly valve is greater than the minimum value in the opening degree range value and less than or equal to the maximum value in the opening degree range value, the speed of the Roots blower is controlled to be the second speed;

[0047] If the opening degree of the pneumatic butterfly valve is greater than the maximum value in the opening degree range, the speed of the Roots blower is controlled to be the third speed;

[0048] Among them, the first speed is less than the second speed, and the second speed is less than the third speed.

[0049] Further, when the processing unit is further configured to determine whether the speed of the Roots blower needs to be adjusted according to whether the opening degree of the pneumatic butterfly valve changes, it includes:

[0050] If the opening degree of the pneumatic butterfly valve becomes larger, it is determined that the speed of the Roots blower needs to be adjusted;

[0051] Otherwise, it is determined that the speed of the Roots blower is not adjusted.

[0052] Further, when the processing unit is further configured to adjust the speed of the Roots blower according to the opening degree change value of the pneumatic butterfly valve, it includes:

[0053] Set an opening degree change range value. If the opening degree change value of the pneumatic butterfly valve is less than the minimum value in the opening degree change range value, the speed of the Roots blower is adjusted by the first adjustment coefficient;

[0054] If the opening change value of the pneumatic butterfly valve is greater than or equal to the minimum value in the opening change range and less than the maximum value in the opening change range, the rotational speed of the Roots blower is adjusted by a second adjustment coefficient;

[0055] If the opening change value of the pneumatic butterfly valve is greater than or equal to the maximum value in the opening change range, the rotational speed of the Roots blower is adjusted by a third adjustment coefficient;

[0056] Among them, the value range of the adjustment coefficient is 1 < the first adjustment coefficient < the second adjustment coefficient < the third adjustment coefficient, and the adjusted rotational speed of the Roots blower is the product of the rotational speed of the Roots blower before adjustment and the adjustment coefficient.

[0057] Compared with the prior art, the beneficial effects of the present invention are as follows: The materials of the present invention can be normally transported. Different materials use corresponding vibrating screens, buffer bins, first level gauges, second level gauges, output pipes, vacuum feeding machines and bins. The material transportation is pollution-free and there is no cross-contamination of materials. The transportation efficiency meets the production capacity requirements and the quality meets the requirements. It solves a series of problems existing in the original bucket elevator transportation, such as partial materials getting damp, materials being easy to fall onto the bucket elevator chain, and then being contaminated and falling into the bucket of the bucket elevator and flowing into the finished product. The rotary distributor cannot be cleaned thoroughly and the materials will also be contaminated, resulting in unqualified materials. After production, it is cleaned, but when producing other materials of different colors, it is also found that there will be materials of different colors, resulting in unqualified materials. At the same time, through the cooperation of the vibrating screen and multiple buffer bins, the fine screening and buffer storage of materials are realized, effectively improving the quality of raw material processing; Secondly, by using the collaborative monitoring of the upper and lower level gauges (the first level gauge and the second level gauge) and cooperating with the pneumatic butterfly valve, the material flow of each link can be accurately controlled to avoid blockage or empty bin phenomena; In addition, the linkage design of the vacuum feeding machine and the Roots blower, combined with the integration of the dust removal tank, significantly reduces the dust pollution while ensuring efficient negative pressure transportation, meeting the environmental protection requirements; Finally, the control module dynamically adjusts the opening of the butterfly valve and the rotational speed of the blower by analyzing the level data in real time, which not only ensures the stability of the system operation but also realizes energy consumption optimization. The overall system structure is compact and the degree of automation is high.

[0058] On the other hand, the present application also provides a negative pressure transportation control method, including:

[0059] Collect the material height, the opening of the pneumatic butterfly valve and the rotational speed of the Roots blower;

[0060] Control the opening and closing of the pneumatic butterfly valve according to the material height, control the opening of the pneumatic butterfly valve according to the material height, judge whether to adjust the opening of the pneumatic butterfly valve according to the change value of the material height, and if it is judged that adjustment is needed, adjust the opening of the pneumatic butterfly valve according to the change value of the material height;

[0061] Control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve, determine the rotational speed of the Roots blower according to the opening degree of the pneumatic butterfly valve, judge whether it is necessary to adjust the rotational speed of the Roots blower according to whether the opening degree of the pneumatic butterfly valve changes, and if it is judged that adjustment is needed, adjust the rotational speed of the Roots blower according to the change value of the opening degree of the pneumatic butterfly valve.

[0062] It can be understood that the negative pressure conveying control system and method provided in this application have the same beneficial effects and will not be elaborated here. Brief Description of the Drawings

[0063] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as limiting the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0064] Figure 1 is a schematic structural diagram of the negative pressure conveying control system provided by an embodiment of the present invention;

[0065] Figure 2 is a flowchart of the negative pressure conveying control method provided by an embodiment of the present invention.

[0066] In the figure, 1, vibrating screen; 2, buffer bin; 3, first level gauge; 4, second level gauge; 5, output pipe; 6, vacuum feeder; 7, silo; 8, dust removal tank; 9, Roots blower; 10, pneumatic butterfly valve. Detailed Embodiments

[0067] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0068] In some embodiments of the present application, referring to Figure 1 as shown, this embodiment provides a negative pressure conveying control system, including:

[0069] A vibrating screen 1 for screening materials;

[0070] A plurality of buffer bins 2 are provided, and one of the buffer bins is connected to the output end of one of the vibrating screens 1;

[0071] The first level gauge 3 and the second level gauge 4, both including several, the first level gauge 3 is arranged at the upper part of the buffer bin 2, and the second level gauge 4 is arranged at the lower part of the buffer bin 2;

[0072] The output pipes 5, including several, each output pipe 5 communicates with the bottom of each buffer bin 2;

[0073] The vacuum loading machines 6, including several, the feeding ports of each vacuum loading machine 6 communicate with the output pipes 5 respectively;

[0074] The bins 7, arranged several, each bin 7 communicates with the output end of each vacuum loading machine 6;

[0075] The dust removal tank 8 communicates with the top of the vacuum loading machine 6 respectively;

[0076] The Roots blower 9 communicates with the dust removal tank 8;

[0077] The pneumatic butterfly valves 10, including several, the pneumatic butterfly valves 10 are respectively arranged on the output pipes 5, the feeding ports of the vacuum loading machines 6, the output ends of the vacuum loading machines 6, and the connection positions between the dust removal tank 8 and the vacuum loading machines 6;

[0078] The control module is connected to the first level gauge 3, the second level gauge 4, the pneumatic butterfly valves 10 and the Roots blower 9, and the control module is used to control the working states of the pneumatic butterfly valves 10 and the Roots blower 9 according to the first level gauge 3 and the second level gauge 4.

[0079] It can be understood that the materials of the present invention can be normally transported. Different materials use corresponding vibrating screens, buffer bins, first level gauges, second level gauges, output pipes, vacuum conveyors, and silos. The material transportation is pollution-free, and there is no cross-contamination of materials. The transportation efficiency meets the production capacity requirements, and the quality meets the requirements. It solves a series of problems existing in the original bucket elevator transportation, such as some materials being hygroscopic, the materials being likely to fall onto the bucket elevator chain, and then being contaminated and falling into the bucket of the bucket elevator and flowing into the finished product. The rotary distributor cannot be cleaned thoroughly, and the materials will also be contaminated, resulting in unqualified materials. After production, it is cleaned, but when producing other materials of different colors, it is also found that there will be materials of different colors, resulting in a series of problems of unqualified materials. At the same time, through the cooperation of the vibrating screen and multiple buffer bins, the refined screening and buffer storage of materials are realized, effectively improving the quality of raw material processing; secondly, by using the collaborative monitoring of the upper and lower level gauges (the first level gauge and the second level gauge), and cooperating with the pneumatic butterfly valve, the material flow in each link can be accurately controlled to avoid blockage or empty silo phenomena; in addition, the linkage design of the vacuum conveyor and the Roots blower, combined with the integration of the dust removal tank, while ensuring efficient negative pressure transportation, significantly reduces dust pollution and meets environmental protection requirements; finally, the control module dynamically adjusts the opening of the butterfly valve and the speed of the blower by analyzing the level data in real time, which not only ensures the stability of the system operation but also realizes energy consumption optimization. The overall system structure is compact and has a high degree of automation.

[0080] Specifically, the first level gauge and the second level gauge adopted in the present invention are from Shanghai Sapai Electronic Technology Co., Ltd., model: SR2-10SDD-150, power supply: 24VDC, operating temperature: -10 - 80 °C;

[0081] The dust removal tank is from WoXin (Shanghai) Machinery Manufacturing Co., Ltd., model: CCG-600, tank diameter: 600 mm, tank wall thickness: 3 mm, dust removal net: PET cloth net, filter screen filtration accuracy: 5 μm;

[0082] The Roots blower is from Zhejiang Shouzheng Roots Blower Manufacturing Co., Ltd., model: HSV-100, power: 15 kW, blower speed: 1750 RMP, flow rate: 11.28 m 3 / h;

[0083] The vacuum conveyor is from WoXin (Shanghai) Machinery Manufacturing Co., Ltd., model: TAZS6, stainless steel filter element filtration accuracy: 5 μm.

[0084] In some embodiments of the present application, the control module includes:

[0085] An acquisition unit configured to acquire the material height, the opening of the pneumatic butterfly valve, and the speed of the Roots blower;

[0086] A processing unit, configured to control the opening and closing of the pneumatic butterfly valve according to the material height, control the opening degree of the pneumatic butterfly valve according to the material height, judge whether to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height, and if it is judged that adjustment is needed, adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height;

[0087] The processing unit is further configured to control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve, determine the rotational speed of the Roots blower according to the opening degree of the pneumatic butterfly valve, judge whether it is necessary to adjust the rotational speed of the Roots blower according to whether the opening degree of the pneumatic butterfly valve changes, and if it is judged that adjustment is needed, adjust the rotational speed of the Roots blower according to the change value of the opening degree of the pneumatic butterfly valve.

[0088] It can be understood that through the real-time monitoring of the material height, valve opening degree and blower rotational speed by the acquisition unit, the comprehensive digital control of the system operation state is realized; secondly, the processing unit adopts a hierarchical control strategy, and dynamically adjusts the opening degree of the pneumatic butterfly valve based on the material height and its change value, which not only ensures the precise control of the conveying flow rate, but also can adaptively process material fluctuations; furthermore, through the intelligent linkage control between the state of the pneumatic butterfly valve and the Roots blower, the rotational speed of the blower is always accurately matched with the system requirements, significantly reducing energy consumption while ensuring the stability of the negative pressure; finally, the system can adjust the rotational speed of the blower in real time according to the change of the valve opening degree to form a closed-loop control. The present invention not only improves the conveying efficiency and stability, but also extends the service life of the equipment.

[0089] In some embodiments of the present application, when the processing unit is configured to control the opening and closing of the pneumatic butterfly valve according to the material height, it includes:

[0090] If the material height in the buffer bin is higher than the height of the first level detector in the buffer bin, control the pneumatic butterfly valve between the buffer bin and the bin connected to the buffer bin to open.

[0091] In some embodiments of the present application, when the processing unit is configured to control the opening degree of the pneumatic butterfly valve according to the material height, it includes:

[0092] Calculate the height difference between the material height and the height of the first level detector, and control the opening degree of the pneumatic butterfly valve according to the height difference; wherein, if the height difference is zero, control the opening degree of the pneumatic butterfly valve to be 0.6;

[0093] Set a first height difference and a second height difference, the first height difference is less than the second height difference, and the first height difference is greater than zero;

[0094] If the height difference is less than or equal to the first height difference, control the opening degree of the pneumatic butterfly valve to be the first opening degree;

[0095] If the height difference is greater than the first height difference and less than or equal to the second height difference, control the opening degree of the pneumatic butterfly valve to be the second opening degree;

[0096] If the height difference is greater than the second height difference, control the opening degree of the pneumatic butterfly valve to be the third opening degree;

[0097] Among them, 0.6 < the first opening degree < the second opening degree < the third opening degree ≤ 0.8.

[0098] It can be understood that the present invention uses the first level gauge as the reference trigger point, and the butterfly valve is opened only when the material height exceeds the set threshold, which not only avoids the no-load energy consumption but also ensures the timeliness of transportation. Secondly, a three-level gradient control strategy is adopted to dynamically adjust the opening degree of the butterfly valve according to the material height difference (the precise range of 0.6 - 0.8), realizing a smooth transition from buffering to accelerated discharge: when the height difference is small, a smaller opening degree is used to maintain a stable flow rate; when the height difference is medium, the opening degree is moderately increased to improve the transportation efficiency; when the height difference is large, a larger opening degree (the third opening degree) is used for rapid adjustment. This progressive control method not only prevents the system impact caused by the sudden surge of materials but also ensures the maximization of transportation efficiency. At the same time, the design of limiting the maximum opening degree within 0.8 not only retains the adjustment margin but also avoids the negative pressure fluctuation caused by too large an opening degree, enabling the system to always work at the optimal operating point.

[0099] In some embodiments of the present application, when the processing unit is configured to determine whether to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height, it includes:

[0100] Collect the historical material height change value within a unit time and calculate the average value of the historical material height change;

[0101] If the change value of the material height within a unit time is less than the average value of the historical material height change, it is determined that the opening degree of the pneumatic butterfly valve needs to be adjusted;

[0102] If the change value of the material height within a unit time is greater than or equal to the average value of the historical material height change, it is determined that the opening degree of the pneumatic butterfly valve does not need to be adjusted.

[0103] In some embodiments of the present application, when the processing unit is configured to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height if it is determined that adjustment is needed, it includes:

[0104] Calculate the deviation rate between the change value of the material height and the average value of the historical material height change:

[0105]

[0106] In the above formula, K represents the deviation rate, △H1 represents the change value of the material height, and △H0 represents the average value of the historical material height changes;

[0107] Set a first deviation rate and a second deviation rate, where the first deviation rate is greater than the second deviation rate, and the first deviation rate is less than zero;

[0108] If the deviation rate is greater than the first deviation rate, adjust the opening degree of the pneumatic butterfly valve through a first adjustment coefficient;

[0109] If the deviation rate is less than or equal to the first deviation rate and greater than or equal to the second deviation rate, adjust the opening degree of the pneumatic butterfly valve through a second adjustment coefficient;

[0110] If the deviation rate is less than the second deviation rate, adjust the opening degree of the pneumatic butterfly valve through a third adjustment coefficient;

[0111] Among them, the value range of the adjustment coefficient is: 1 < first adjustment coefficient < second adjustment coefficient < third adjustment coefficient; the adjusted opening degree of the pneumatic butterfly valve is the product of the opening degree of the pneumatic butterfly valve before adjustment and the adjustment coefficient, and the maximum adjusted opening degree of the pneumatic butterfly valve is 1.

[0112] It can be understood that the present invention realizes an objective evaluation of the current material conveying state by establishing an average value of historical material height changes as a reference value, avoiding the uncertainty of human experience judgment. Secondly, the deviation rate (K) is introduced as the adjustment basis, and three-level deviation intervals are set to correspond to different adjustment intensities, forming a progressive response mechanism: when the change value of the material height decreases slightly, a small adjustment coefficient is used for fine adjustment; when it decreases moderately, a medium coefficient is used for adjustment; when it decreases severely, a large coefficient is used for rapid response. This hierarchical control method can not only eliminate the blockage risk in time but also avoid system oscillation caused by over-adjustment. The present invention significantly improves the adaptability of the system to changes in material characteristics through data-driven closed-loop control.

[0113] In some embodiments of the present application, the processing unit is further configured to control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve. When determining the rotation speed of the Roots blower according to the opening degree of the pneumatic butterfly valve, it includes:

[0114] If the pneumatic butterfly valve is opened, control the Roots blower to be opened;

[0115] Set an opening degree range value. If the opening degree of the pneumatic butterfly valve is less than or equal to the minimum value in the opening degree range value, control the rotation speed of the Roots blower to be the first rotation speed;

[0116] If the opening degree of the pneumatic butterfly valve is greater than the minimum value in the opening degree range value and less than or equal to the maximum value in the opening degree range value, the rotational speed of the Roots blower is controlled to be the second rotational speed;

[0117] If the opening degree of the pneumatic butterfly valve is greater than the maximum value in the opening degree range, the rotational speed of the Roots blower is controlled to be the third rotational speed;

[0118] Wherein, the first rotational speed is less than the second rotational speed, and the second rotational speed is less than the third rotational speed.

[0119] In some embodiments of the present application, when the processing unit is further configured to determine whether it is necessary to adjust the rotational speed of the Roots blower according to whether the opening degree of the pneumatic butterfly valve changes, it includes:

[0120] If the opening degree of the pneumatic butterfly valve becomes larger, it is determined that it is necessary to adjust the rotational speed of the Roots blower;

[0121] Otherwise, it is determined not to adjust the rotational speed of the Roots blower.

[0122] In some embodiments of the present application, when the processing unit is further configured to adjust the rotational speed of the Roots blower according to the opening degree change value of the pneumatic butterfly valve, it includes:

[0123] Set an opening degree change range value. If the opening degree change value of the pneumatic butterfly valve is less than the minimum value in the opening degree change range value, the rotational speed of the Roots blower is adjusted by a first adjustment coefficient;

[0124] If the opening degree change value of the pneumatic butterfly valve is greater than or equal to the minimum value in the opening degree change range and less than the maximum value in the opening degree change range, the rotational speed of the Roots blower is adjusted by a second adjustment coefficient;

[0125] If the opening degree change value of the pneumatic butterfly valve is greater than or equal to the maximum value in the opening degree change range, the rotational speed of the Roots blower is adjusted by a third adjustment coefficient;

[0126] Wherein, the value range of the adjustment coefficient is 1 < first adjustment coefficient < second adjustment coefficient < third adjustment coefficient, and the adjusted rotational speed of the Roots blower is the product of the rotational speed of the Roots blower before adjustment and the adjustment coefficient.

[0127] It can be understood that the stepped rotational speed control of the present invention not only avoids energy waste but also meets the requirements of different working conditions. The system dynamically adjusts the rotational speed of the blower by using three - level adjustment coefficients through real - time monitoring of the opening degree change value of the butterfly valve, and the adaptive adjustment method effectively suppresses the pressure fluctuation caused by the valve action. It is particularly worth noting that the design that the system only adjusts the rotational speed when the opening degree of the butterfly valve increases not only simplifies the control logic but also avoids the energy consumption loss caused by frequent adjustment.

[0128] On the other hand, referring to Figure 2 as shown, the present application also provides a negative pressure conveying control method, which is applied to the above-mentioned negative pressure conveying control system, and includes the following steps:

[0129] S100. Collect the material height, the opening degree of the pneumatic butterfly valve, and the rotational speed of the Roots blower;

[0130] S200. Control the opening and closing of the pneumatic butterfly valve according to the material height, control the opening degree of the pneumatic butterfly valve according to the material height, judge whether to adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height, and if it is judged that adjustment is needed, adjust the opening degree of the pneumatic butterfly valve according to the change value of the material height;

[0131] S300. Control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve, determine the rotational speed of the Roots blower according to the opening degree of the pneumatic butterfly valve, judge whether to adjust the rotational speed of the Roots blower according to whether the opening degree of the pneumatic butterfly valve changes, and if it is judged that adjustment is needed, adjust the rotational speed of the Roots blower according to the change value of the opening degree of the pneumatic butterfly valve.

[0132] It can be understood that in S100 of the present invention, a full-process data monitoring network is first established by collecting key parameters such as material height, valve opening degree, and fan rotational speed in real time, providing data support for intelligent decision-making; furthermore, S200 adopts a three-level control strategy: controlling the start and stop of the valve based on the absolute value of the material height (ensuring the timeliness of conveying), dynamically adjusting based on the change value of the height (realizing precise flow control), and the linkage response between the valve and the fan, forming a closed-loop adjustment mechanism; finally, in S300, through the intelligent matching of the valve opening degree and the fan rotational speed, a dual adjustment mode of "opening degree grading + change amount grading" is adopted, which not only ensures the fast response ability of the negative pressure but also avoids energy waste.

[0133] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt 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.

[0134] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams can be implemented by computer program instructions, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to generate a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices generate means for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks or a plurality of blocks.

[0135] 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, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks or a plurality of blocks.

[0136] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 means for implementing the functions specified in one or more blocks or a plurality of blocks.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific embodiments of the present invention or make equivalent replacements, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A negative pressure delivery control system, characterized in that: include: Vibrating screen, used to screen materials; A plurality of buffer bins are provided, one of which is connected to an output end of the vibrating screen; The first material level indicator and the second material level indicator each include a plurality of first material level indicators, the first material level indicator is arranged at the upper part of the buffer bin, and the second material level indicator is arranged at the lower part of the buffer bin; Output pipes, including a plurality of output pipes, each of which is connected to the bottom of each of the buffer bins; A vacuum feeder, comprising a plurality of vacuum feeders, wherein the feed port of each vacuum feeder is respectively connected to the output pipe; There are several silos, each of which is connected to the output end of each vacuum loader; Dust removal tanks are respectively connected to the tops of the vacuum loaders; A Roots blower connected to the dust removal tank; A plurality of pneumatic butterfly valves are provided, and the pneumatic butterfly valves are respectively provided on the output pipe, the feed port of the vacuum feeder, the output end of the vacuum feeder, and the connection between the dust removal tank and the vacuum feeder; A control module is connected to the first material level sensor, the second material level sensor, the pneumatic butterfly valve and the Roots blower, and the control module is used to control the working states of the pneumatic butterfly valve and the Roots blower according to the first material level sensor and the second material level sensor.

2. The negative pressure delivery control system according to claim 1, characterized in that: The control module comprises: A collection unit is configured to collect material height, pneumatic butterfly valve opening and Roots blower speed; a processing unit configured to control the opening and closing of the pneumatic butterfly valve according to the material height, and to control the opening of the pneumatic butterfly valve according to the material height, and to determine whether to adjust the opening of the pneumatic butterfly valve according to the change value of the material height, and if it is determined that adjustment is required, to adjust the opening of the pneumatic butterfly valve according to the change value of the material height; The processing unit is also configured to control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve, determine the speed of the Roots blower according to the opening of the pneumatic butterfly valve, and judge whether the speed of the Roots blower needs to be adjusted according to whether the opening of the pneumatic butterfly valve changes; if adjustment is determined to be necessary, adjust the speed of the Roots blower according to the change value of the opening of the pneumatic butterfly valve.

3. The negative pressure delivery control system according to claim 2, characterized in that: When the processing unit is configured to control the opening and closing of the pneumatic butterfly valve according to the material height, it includes: If the height of the material in the buffer bin is higher than the height of the first material level indicator in the buffer bin, the pneumatic butterfly valve between the buffer bin and the material bin connected to the buffer bin is controlled to open.

4. The negative pressure delivery control system according to claim 3, characterized in that: When the processing unit is configured to control the opening of the pneumatic butterfly valve according to the material height, it includes: Calculate the height difference between the material height and the first material level indicator, and control the opening of the pneumatic butterfly valve according to the height difference; wherein, if the height difference is zero, control the opening of the pneumatic butterfly valve to 0.6; Setting a first height difference and a second height difference, wherein the first height difference is smaller than the second height difference and the first height difference is greater than zero; If the height difference is less than or equal to the first height difference, controlling the opening of the pneumatic butterfly valve to be a first opening; If the height difference is greater than the first height difference and less than or equal to the second height difference, the opening of the pneumatic butterfly valve is controlled to be the second opening; If the height difference is greater than the second height difference, controlling the opening of the pneumatic butterfly valve to be a third opening; Among them, 0.6<first opening degree<second opening degree<third opening degree≤0.

8.

5. The negative pressure delivery control system according to claim 4, characterized in that: When the processing unit is configured to determine whether to adjust the opening of the pneumatic butterfly valve according to the change value of the material height, it includes: Collect the historical material height change values ​​within a unit time and calculate the average value of the historical material height change; If the change value of the material height per unit time is less than the average value of the historical material height change, it is determined that the opening of the pneumatic butterfly valve needs to be adjusted; If the change value of the material height per unit time is greater than or equal to the historical average value of the material height change, it is determined that there is no need to adjust the opening of the pneumatic butterfly valve.

6. The negative pressure delivery control system according to claim 5, characterized in that: The processing unit is configured to adjust the opening of the pneumatic butterfly valve according to the change value of the material height if it is determined that adjustment is needed, including: Calculate the deviation rate between the change value of the material height and the average value of the historical material height change: In the above formula, K represents the deviation rate, △H1 represents the change value of material height, and △H0 represents the average value of historical material height change; Setting a first deviation rate and a second deviation rate, wherein the first deviation rate is greater than the second deviation rate, and the first deviation rate is less than zero; If the deviation rate is greater than the first deviation rate, adjusting the opening of the pneumatic butterfly valve by a first adjustment coefficient; If the deviation rate is less than or equal to the first deviation rate and greater than or equal to the second deviation rate, the opening of the pneumatic butterfly valve is adjusted by a second adjustment coefficient; If the deviation rate is less than the second deviation rate, adjusting the opening of the pneumatic butterfly valve by a third adjustment coefficient; Among them, the value range of the adjustment coefficient is: 1<first adjustment coefficient<second adjustment coefficient<third adjustment coefficient; the opening of the adjusted pneumatic butterfly valve is the product of the opening of the pneumatic butterfly valve before adjustment and the adjustment coefficient, and the maximum opening of the adjusted pneumatic butterfly valve is 1.

7. The negative pressure delivery control system according to claim 6, characterized in that: The processing unit is further configured to control the opening and closing of the Roots blower according to the opening and closing of the pneumatic butterfly valve, and determine the rotation speed of the Roots blower according to the opening of the pneumatic butterfly valve, including: If the pneumatic butterfly valve is opened, the Roots blower is controlled to be opened; Setting an opening range value, if the opening of the pneumatic butterfly valve is less than or equal to the minimum value in the opening range value, controlling the rotation speed of the Roots blower to a first rotation speed; If the opening of the pneumatic butterfly valve is greater than the minimum value in the opening range and less than or equal to the maximum value in the opening range, the rotation speed of the Roots blower is controlled to be the second rotation speed; If the opening of the pneumatic butterfly valve is greater than the maximum value in the opening range, the rotation speed of the Roots blower is controlled to be a third rotation speed; The first speed is smaller than the second speed, and the second speed is smaller than the third speed.

8. The negative pressure delivery control system according to claim 7, characterized in that: The processing unit is further configured to determine whether the rotation speed of the Roots blower needs to be adjusted according to whether the opening of the pneumatic butterfly valve changes, including: If the opening of the pneumatic butterfly valve becomes larger, it is determined that the rotation speed of the Roots blower needs to be adjusted; Otherwise, it is determined that the rotation speed of the Roots blower is not to be adjusted.

9. The negative pressure delivery control system according to claim 8, characterized in that: The processing unit is further configured to adjust the rotation speed of the Roots blower according to the opening change value of the pneumatic butterfly valve, including: Setting an opening variation range value, if the opening variation value of the pneumatic butterfly valve is less than a minimum value in the opening variation range value, adjusting the rotation speed of the Roots blower by a first adjustment coefficient; If the opening variation value of the pneumatic butterfly valve is greater than or equal to the minimum value in the opening variation range and less than the maximum value in the opening variation range, the rotation speed of the Roots blower is adjusted by the second adjustment coefficient; If the opening variation value of the pneumatic butterfly valve is greater than or equal to the maximum value in the opening variation range, the rotation speed of the Roots blower is adjusted by a third adjustment coefficient; The value range of the adjustment coefficient is 1<first adjustment coefficient<second adjustment coefficient<third adjustment coefficient, and the adjusted Roots blower speed is the product of the Roots blower speed before adjustment and the adjustment coefficient.

10. A negative pressure delivery control method, applied to the negative pressure delivery control system according to any one of claims 1 to 9, characterized in that: include: Collect material height, pneumatic butterfly valve opening and Roots blower speed; Controlling the opening and closing of the pneumatic butterfly valve according to the material height, and controlling the opening of the pneumatic butterfly valve according to the material height, judging whether to adjust the opening of the pneumatic butterfly valve according to the change value of the material height, and if it is judged that adjustment is required, adjusting the opening of the pneumatic butterfly valve according to the change value of the material height; The opening and closing of the Roots blower is controlled according to the opening and closing of the pneumatic butterfly valve, the rotation speed of the Roots blower is determined according to the opening of the pneumatic butterfly valve, and it is judged whether the rotation speed of the Roots blower needs to be adjusted according to whether the opening of the pneumatic butterfly valve changes. If adjustment is determined to be necessary, the rotation speed of the Roots blower is adjusted according to the change value of the opening of the pneumatic butterfly valve.

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