Storage cabinet tobacco leaf discharging flow control method

Abstract

A storage cabinet tobacco leaf discharging flow control method comprises the steps that the volume of materials at the starting end of a conveying belt at the T moment is detected, and the rotating speed of a stirring roller is adjusted at the T1 moment according to the volume of the materials at the starting end of the conveying belt; predicting the time t from the starting end of the conveyor belt to the tail end of the conveyor belt according to the speed of the conveyor belt, and adjusting the speed of the conveyor belt according to the volume of the starting end of the conveyor belt; judging whether the material volume at the starting end of the conveyor belt is greater than the first volume; if yes, the rotating speed of the first material stirring roller, the rotating speed of the second material stirring roller and the rotating speed of the third material stirring roller are adjusted; if not, the rotating speed of the first material stirring roller and / or the second material stirring roller is adjusted; by combining the volume of the material at the starting end of the conveyor belt, the speed of the conveyor belt and the cross sectional area of the material at the starting end of the conveyor belt, constant tobacco leaf discharge flow on the constant-speed conveyor belt is realized, production efficiency is improved, and production cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control, and more particularly, to a method for controlling the discharge flow of tobacco leaves in a storage cabinet. Background Art

[0002] When discharging materials from each storage cabinet in the current tobacco leaf processing production line, in the existing production control, some storage cabinets discharge materials at a fixed speed when the photoelectric tube detects that there is material, but the discharge flow rate is unknown. However, due to the structural characteristics of the storage cabinet, the thickness of the materials stored in the storage cabinet is different (the cross-section is trapezoidal), especially in the starting end and the ending end areas of the storage cabinet. The fixed speed will cause the discharge flow rate of the storage cabinet to be unstable, and it may be higher or lower than the subsequent flow rate requirements, unable to meet the flow rate requirements of the subsequent processing procedures, thus resulting in the processing accuracy not meeting the process indicators and seriously affecting the product quality.

[0003] In response to the above problems, when discharging materials from each storage cabinet in the current tobacco leaf processing production line, due to some factors, the materials in the storage cabinet are prone to appear in lumps when leaving the cabinet, and are distributed in piles on the discharge conveyor belt, which has an impact on the subsequent homogenization production.

[0004] Therefore, the present invention provides a method for controlling the discharge flow of tobacco leaves in a storage cabinet, adding corresponding equipment for real-time flow data collection, and combining intelligent control algorithms to perform variable frequency adjustment on the speeds of the storage cabinet and the conveyor belt, so as to improve the discharge stability. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for controlling the discharge flow of tobacco leaves in a storage cabinet. By performing variable frequency control on the bottom belt motor and the conveyor belt motor of the storage cabinet, the discharge stability of the storage cabinet is improved, thereby improving the production efficiency and the stability of product quality, and reducing the production cost and energy consumption.

[0006] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A method for controlling the discharge flow of tobacco leaves in a storage cabinet, detecting the volume of the materials at the starting end of the conveyor belt at time T, and adjusting the rotation speed of the feeding roller according to the volume of the materials at the starting end of the conveyor belt at time T1; predicting the time t when the materials at the starting end of the conveyor belt reach the end of the conveyor belt according to the speed of the conveyor belt, and adjusting the speed of the conveyor belt according to the volume of the materials at the starting end of the conveyor belt at time t.

[0008] Further, it is determined whether the volume of the materials at the starting end of the conveyor belt is greater than the first volume;

[0009] If so, adjust the rotation speeds of the first feeding roller, the second feeding roller, and the third feeding roller;

[0010] If not, adjust the rotational speed of the first material feeding roller and / or the second material feeding roller.

[0011] Furthermore, the first image acquisition device acquires the cross-sectional area of the material at the first position of the storage cabinet every T + t moments, calculates the volume of the material, and adjusts the speed of the storage cabinet according to the volume of the material.

[0012] The second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt every T moments and calculates the volume of the material.

[0013] Furthermore, the first image acquisition device acquires the cross-sectional areas of the material at the first, second, and third positions of the storage cabinet at a set time interval, predicts the contact areas between the material at the first, second, and third positions of the storage cabinet and the material feeding roller according to the cross-sectional areas, and adjusts the rotational speed of the material feeding roller according to the contact areas between the material and the material feeding roller.

[0014] Furthermore, calculate the volumes of the material at the first, second, and third positions of the storage cabinet. When the material reaches the end of the storage cabinet, determine whether it is greater than the first volume. If so, adjust the speed of the storage cabinet.

[0015] Furthermore, three material feeding rollers are coaxially arranged vertically above the end of the storage cabinet. When the material feeding roller contacts the material, adjust the rotational speed of the material feeding roller according to the contact area between the material and the material feeding roller.

[0016] When the contact area between the material and the material feeding roller is greater than or equal to the first area and less than the second area, adjust the rotational speed of the first material feeding roller, and keep the rotational speeds of the second and third material feeding rollers unchanged.

[0017] When the contact area between the material and the material feeding roller is greater than or equal to the first area and less than the second area, the rotational speed of the first material feeding roller is greater than the rotational speeds of the second and third material feeding rollers.

[0018] Furthermore, when the contact area between the material and the material feeding roller is greater than or equal to the second area and less than the third area, adjust the rotational speeds of the first and second material feeding rollers, and keep the rotational speed of the third material feeding roller unchanged.

[0019] When the contact area between the material and the material feeding roller is greater than or equal to the second area and less than the third area, the rotational speed of the first material feeding roller is greater than the rotational speed of the second material feeding roller, and the rotational speed of the second material feeding roller is greater than the rotational speed of the third material feeding roller.

[0020] Furthermore, when the contact area between the material and the material feeding roller is greater than or equal to the third area, adjust the rotational speeds of the first, second, and third material feeding rollers simultaneously.

[0021] When the contact area between the material and the material feeding roller is greater than or equal to the third area, the rotation speed of the first material feeding roller is greater than that of the second material feeding roller, and the rotation speed of the second material feeding roller is greater than that of the third material feeding roller;

[0022] Or, when the contact area between the material and the material feeding roller is greater than or equal to the third area, the rotation speeds of the three material feeding rollers are the same.

[0023] Furthermore, it further includes a constant-speed conveyor belt. At any position above the constant-speed conveyor belt, a third image acquisition device is fixedly arranged. At time t, the third image acquisition device acquires the cross-sectional area of the material on the constant-speed conveyor belt in real time and calculates the volume of the material on the constant-speed conveyor belt.

[0024] Judge whether the volume of the material on the constant-speed conveyor belt is greater than the set volume range. If so, adjust the speed of the conveyor belt according to the current volume of the material on the constant-speed conveyor belt.

[0025] Furthermore, the storage cabinet, the conveyor belt, and the constant-speed conveyor belt are arranged horizontally and transversely in sequence. The horizontal plane where the storage cabinet is located is the first horizontal plane, and the horizontal plane where the constant-speed conveyor belt is located is the second horizontal plane.

[0026] The first horizontal plane is higher than the second horizontal plane;

[0027] The conveyor belt is inclined. The surface of the bottom belt of the conveyor belt forms an angle greater than 30° and less than 60° with the second horizontal plane. The starting end of the conveyor belt is located on the second horizontal plane, and the end of the conveyor belt is higher than the first horizontal plane;

[0028] A first image acquisition device is arranged above the storage cabinet. The first image acquisition device moves back and forth horizontally to acquire the cross-sectional area of the material from the starting end to the end of the storage cabinet;

[0029] A second image acquisition device is fixedly arranged above the starting end of the conveyor belt. The second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt.

[0030] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0031] 1. By combining parameters such as the volume of the material at the starting end of the conveyor belt, the conveyor belt speed, and the cross-sectional area of the material at the starting end of the conveyor belt, precise control of the tobacco leaf discharging flow rate is achieved. According to the volume of the material at the starting end of the conveyor belt and the conveyor belt speed, by adjusting the rotation speed of the material feeding roller and the instantaneous speed of the conveyor belt, real-time adjustment of the tobacco leaf discharging flow rate can be realized to ensure that the discharging amount matches the production demand.

[0032] 2. By using the conveyor belt speed and the volume of the material at the starting end, combined with the prediction algorithm, the time when the material at the starting end of the conveyor belt reaches the end of the conveyor belt can be predicted, so as to timely adjust the instantaneous speed of the conveyor belt and avoid excessive fluctuations in the discharging amount.

[0033] 3. The second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt, and the first image obtains the volume information of the material at the starting end of the conveyor belt. By comprehensively using this information, the speeds of the storage cabinet and the conveyor belt can be adjusted to make the discharging flow rate constant.

[0034] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0035] The accompanying drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0036] Figure 1 It is a schematic diagram of tobacco leaves leaving the storage cabinet;

[0037] Figure 2 It is a flow chart of tobacco leaves leaving the storage cabinet of the present invention;

[0038] Figure 3 It is a schematic diagram of material transmission on the conveyor belt of the present invention;

[0039] Figure 4 It is a schematic diagram of the material contacting the material pushing roller of the present invention.

[0040] It should be noted that these drawings and the textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Based on a high-precision and fast-response flowmeter and edge device, the present invention combines the LSTM flow intelligent control algorithm to optimize the PLC electric control program, realizing variable-frequency control of the bottom belt motor and conveyor belt motor of the storage cabinet, so as to achieve the purpose of accurately controlling the flow rate of materials when leaving the cabinet. Thereby improving the production efficiency and the stability of product quality, reducing production costs and energy consumption, and creating greater economic benefits for tobacco production enterprises.

[0045] In this embodiment, the storage cabinet, the conveyor belt, and the constant-speed conveyor belt are arranged horizontally and sequentially in a transverse direction. The horizontal plane where the storage cabinet is located is the first horizontal plane, and the horizontal plane where the constant-speed conveyor belt is located is the second horizontal plane.

[0046] The first horizontal plane is higher than the second horizontal plane;

[0047] The conveyor belt is inclined. The surface of the bottom belt of the conveyor belt forms an angle greater than 30° and less than 60° with the second horizontal plane. The starting end of the conveyor belt is located on the second horizontal plane, and the end of the conveyor belt is higher than the first horizontal plane;

[0048] In this embodiment, the inclination angle of the conveyor belt is 45°.

[0049] A first image acquisition device is arranged above the storage cabinet. The first image acquisition device moves back and forth in the horizontal direction to acquire the cross-sectional area of the material from the starting end to the end of the storage cabinet; the first image acquisition device can move back and forth above the storage cabinet and can acquire the cross-sectional area of the material at all positions on the storage cabinet.

[0050] A second image acquisition device is fixedly arranged above the starting end of the conveyor belt. The second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt. When the length of the conveyor belt is H, the starting end of the conveyor belt can be H / 2, that is, half of the conveyor belt length is defined as the starting end of the conveyor belt, and the other half is defined as the end of the conveyor belt.

[0051] Both the first image acquisition device and the second image acquisition device are devices that can acquire object images and obtain the cross-sectional area of the object. In the present invention, an infrared lidar detector is used. After the image acquisition device obtains the cross-sectional area, the volume of the material can be calculated by continuing to use the image acquisition device, or the volume of the material can be calculated through the controller.

[0052] The controller is communicatively connected to the first image acquisition device and the second image acquisition device.

[0053] A method for controlling the discharge flow of tobacco leaves includes the following steps:

[0054] S1: The first image acquisition device acquires the cross-sectional area of the material at the first position of the storage cabinet, and calculates the volume of the material based on the cross-sectional area.

[0055] S2: Predict the time T when the material at the first position of the storage cabinet reaches the end of the storage cabinet based on the volume, and adjust the speed of the storage cabinet at time T.

[0056] S3: At time T, the second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt, and calculates the volume of the material based on the cross-sectional area.

[0057] S4: Predict the time t when the material at the starting end of the conveyor belt reaches the end of the conveyor belt based on the volume of the material at the starting end of the conveyor belt, and adjust the speed of the conveyor belt and the speed of the storage cabinet at time T + t.

[0058] S5: At time T + t, execute S1 to S5.

[0059] S6: Adjust the speed of the deflector roller according to the cross-sectional area of the material at the first position of the storage cabinet and the contact area between the material and the deflector roller.

[0060] S1 - S5 are executed in a loop; S6 can be started at any time. As long as the material is in contact with the deflector roller, the speed of the deflector roller can be adjusted according to the contact area between the material and the deflector roller.

[0061] For example, if at time T n + t n the volume of the material at the first position of the storage cabinet is greater than the volume of the material at the first position of the storage cabinet at time T n-1 + t n-1 then T n is greater than T n-1 ;

[0062] If at time T n the volume of the material at the starting end of the conveyor belt is greater than the volume of the material at the starting end of the conveyor belt at time T n-1 then t n is greater than t n-1 . This indicates that the speed of the storage cabinet at this time was adjusted faster because the volume of the previous section of the material was small, so the current material will reach the end of the storage cabinet faster at the current speed of the storage cabinet.

[0063] Detect the volume of the material at the starting end of the conveyor belt at time T, and adjust the rotation speed of the material distributing roller according to the volume of the material at the starting end of the conveyor belt at time T1; predict the time t when the material at the starting end of the conveyor belt reaches the end of the conveyor belt according to the speed of the conveyor belt, and adjust the speed of the conveyor belt according to the volume of the material at the starting end of the conveyor belt at time t.

[0064] The second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt, calculates the volume of the material at the starting end of the conveyor belt according to the cross-sectional area, and the first image acquisition device obtains the volume information of the material at the starting end of the conveyor belt.

[0065] Judge whether the volume of the material at the starting end of the conveyor belt is greater than the first volume;

[0066] If so, adjust the rotation speeds of the first material distributing roller, the second material distributing roller, and the third material distributing roller;

[0067] If not, adjust the rotation speed of the first material distributing roller and / or the second material distributing roller.

[0068] The first volume is the maximum volume, which is the volume obtained when the material is in full contact with the material distributing roller.

[0069] A method for controlling the discharge flow of tobacco leaves in a storage cabinet. The first image acquisition device acquires the cross-sectional area of the material at the first position of the storage cabinet, calculates the volume of the material according to the cross-sectional area,

[0070] Predict the time T when the material at the first position reaches the end of the storage cabinet, and adjust the rotation speed of the material distributing roller and the speed of the storage cabinet according to the volume of the material at time T;

[0071] At time T, the second image acquisition device acquires the cross-sectional area of the material at the starting end of the conveyor belt, calculates the volume of the material according to the cross-sectional area,

[0072] Predict the time t when the material at the starting end of the conveyor belt reaches the end of the conveyor belt, and adjust the speed of the conveyor belt and the speed of the storage cabinet according to the volume of the material at time T + t.

[0073] The first position of the storage cabinet can be a position at a certain distance from the end of the storage cabinet, which can make the predicted material at the first position reach the end of the storage cabinet with a certain time. The end of the storage cabinet is the position where the storage cabinet discharges materials, not exceeding half of the length of the storage cabinet. Preferably, it can be one-third of the length of the storage cabinet for discharging materials.

[0074] Such as Figure 3As shown, the materials on the conveyor belt are transported in the direction indicated by the arrow. Both the starting end and the ending end of the conveyor belt can be set to half of the conveyor belt length. Record the positions of the materials at the starting end and the ending end of the conveyor belt. In one conveyor belt, record three points as distinguishing points. Point a is at the starting end, point b is at the middle position, and point c is at the material discharging position at the ending end. ab = bc, and the time taken for the material at position a to reach position b is equal to the time taken for the material at position b to reach position c. When the material at position b reaches position c, the second image acquisition device acquires the cross-sectional area of the materials between the current positions of a and b again.

[0075] At time T + t, the first image acquisition device acquires the cross-sectional area of the materials at the current first position in the storage cabinet, calculates the volume of the materials at the current first position based on the cross-sectional area, and predicts the time T when the materials at the current first position reach the ending end of the storage cabinet according to the current speed of the storage cabinet and the volume of the materials.

[0076] T represents a definite moment when the materials at the first position in the storage cabinet reach the ending end of the storage cabinet, and t represents a time period from the moment T when the materials at the starting end of the conveyor belt reach the ending end of the conveyor belt. Therefore, T + t represents a new moment obtained after a time period of t starting from the moment T.

[0077] For example, assume that at time T, the first image acquisition device acquires the cross-sectional area of the materials at the current first position in the storage cabinet as 1 square meter. Based on this cross-sectional area, we calculate that the volume of the materials at the current first position is 2 cubic meters. Assume the current speed of the storage cabinet is 0.5 meters per minute. We can predict the time T when the materials at the current first position reach the ending end of the storage cabinet according to the speed and the volume of the materials. According to the physical formula: speed = distance / time, we can get time = distance / speed. Assume the length of the storage cabinet is 3 meters, then the time required for the materials to reach the ending end from the first position is 3 meters / 0.5 meters per minute = 6 minutes. Therefore, based on this information, at time T, the volume of the materials at the first position is 2 cubic meters, and it is predicted that at time T + 6 minutes, these materials will reach the ending end of the storage cabinet.

[0078] At time T, the second image acquisition device acquires the cross-sectional area of the materials at the current starting end of the conveyor belt, calculates the volume of the materials at the current starting end of the conveyor belt based on the cross-sectional area, and predicts the time t when the materials at the starting end of the conveyor belt reach the ending end of the conveyor belt according to the current speed of the conveyor belt and the volume of the materials at the starting end of the conveyor belt;

[0079] The first image acquisition device obtains the volume information of the materials at the starting end of the conveyor belt and adjusts the speed of the storage cabinet according to the volume of the materials at the ending end of the conveyor belt at time t.

[0080] Both the first image acquisition device and the second image acquisition device acquire the cross-sectional area of the materials in real time at regular time intervals.

[0081] Used to monitor and adjust the flow of materials on the conveyor belt and adjust the speed of the storage cabinet to adapt to the changes in the material. Such a system can help optimize the production process, improve production efficiency and reduce resource waste.

[0082] By collecting material information in real time and predicting the arrival time of materials, the storage cabinet speed can be adjusted in time to avoid material backlog or idle storage cabinets. Optimizing the flow and storage of materials can improve the overall efficiency of the production line and reduce stagnation and waste in the production process. It avoids the waste of resources caused by excessive material backlog or premature unloading, making the production process more resource-efficient.

[0083] The materials are in irregular and piled shape in the storage cabinet. The area of ​​the empty cabinet is denoted as Sr, and the area of ​​the full cabinet is denoted as Sm. Then the cross-sectional area of ​​the materials is Ss = Sr-Sm.

[0084] like Figure 1 As shown, materials in different areas include the head (a, b, c), steady state (d), and tail (e, f, g) parts of the materials; the heights of materials in different areas are collected; cluster analysis is performed based on the unloading speeds obtained after the materials at different heights come into contact with the feeding roller, and the center height values ​​of the materials in different areas of the storage cabinet are obtained.

[0085] The volume of a material is represented by the center height value of the material and the cross-sectional area of ​​the material.

[0086] The material unit volume flow rate C is measured by the product of the speed of the storage tank or conveyor belt and the cross-sectional area of ​​the material: v t+Δt S t =C

[0087] In order to achieve a stable volume flow, it is only necessary to keep C constant and the length H of the conveyor belt fixed; the calculus control algorithm controls the speed of the storage cabinet;

[0088]

[0089]

[0090]

[0091]

[0092]

[0093] H, C, S u , t are known quantities, store s u List of data L S :

[0094] If L SThe time interval for data acquisition is δ, and the actual speed is v t ∈[0, v max , then the cross-sectional area data actually collected at time t should satisfy:

[0095]

[0096] In this embodiment, the speed of the conveyor belt can also be obtained according to the above calculation formula.

[0097] In this embodiment, the speed of the storage cabinet is adjusted while adjusting the speed of the conveyor belt at T2;

[0098] The controller processes the data through a calculus control algorithm, transforms the speed value into a corresponding variable-frequency voltage value, and writes it into the PLC electric control program to achieve the stability of the out-of-cabinet flow rate.

[0099] Obtain the speed value: First, obtain the speed value of the motor at the bottom of the storage cabinet or the conveyor belt through an encoder, a sensor, an infrared radar detector, or other controllers. For example, the speed value is 1000 RPM.

[0100] Design the mapping relationship between the variable-frequency voltage value and the speed: Assume that the variable-frequency voltage value (V) = 0.1 * speed value (RPM). According to this relationship, when the speed value is 1000 RPM, the corresponding variable-frequency voltage value is 100V.

[0101] Calculate the variable-frequency voltage value: Calculate the variable-frequency voltage value according to the above mapping relationship: 100V.

[0102] Write the variable-frequency voltage value into the PLC electric control program: In the PLC programming software, write the calculated variable-frequency voltage value (100V) into the specified output register or data register through the corresponding logic block or function block.

[0103] Control the output signal: Configure the corresponding logic in the PLC program so that the voltage value in the output register or data register can be converted into a control signal and sent to the frequency converter through the digital output port or analog output port of the PLC to achieve the control of the motor at the bottom of the storage cabinet or the first conveyor belt motor.

[0104] Therefore, the steps of converting the speed value into the corresponding variable-frequency voltage value and writing it into the PLC electric control program are summarized as follows:

[0105] S1. Obtain the speed value: Obtain the speed of the storage cabinet or the conveyor belt from devices such as sensors or controllers.

[0106] S2. Design the mapping relationship: Determine the functional relationship between the variable-frequency voltage value and the speed, which can be a linear function, a look-up table, or other mathematical models. In the present invention, it shows a linear negative correlation relationship.

[0107] S3. Calculate the variable-frequency voltage value: According to the mapping relationship, convert the speed value into the corresponding variable-frequency voltage value through programming logic or operation functions.

[0108] S4. Write into the PLC program: Write the calculated variable-frequency voltage value into the output register or data register of the PLC through the PLC programming software.

[0109] S5. Control the output signal: According to the PLC program design, convert the output variable-frequency voltage value into the corresponding control signal and send it to the frequency converter or other control devices to control the motor.

[0110] Three feeding rollers are coaxially arranged vertically above the end of the storage cabinet. When the feeding rollers contact the material, adjust the rotation speed of the feeding rollers according to the contact area between the material and the feeding rollers.

[0111] When the contact area between the material and the feeding rollers is greater than or equal to the first area and less than the second area, adjust the rotation speed of the first feeding roller, and keep the rotation speeds of the second and third feeding rollers unchanged.

[0112] Preferably, when the contact area between the material and the feeding rollers is greater than or equal to the first area and less than the second area, the rotation speed of the first feeding roller is greater than the rotation speeds of the second and third feeding rollers.

[0113] As Figure 4 shown, determine the rotation speed of the feeding rollers according to the contact area between the material and the feeding rollers. The first area is the area when the material is in full contact with the first feeding roller, the second area is the area when the material is in contact with the first and second feeding rollers, and the third area is the area when the material is in contact with the first, second, and third feeding rollers.

[0114] When the contact area between the material and the feeding rollers is greater than or equal to the second area and less than the third area, adjust the rotation speeds of the first and second feeding rollers, and keep the rotation speed of the third feeding roller unchanged.

[0115] Preferably, when the contact area between the material and the feeding rollers is greater than or equal to the second area and less than the third area, the rotation speed of the first feeding roller is greater than the rotation speed of the second feeding roller, and the rotation speed of the second feeding roller is greater than the rotation speed of the third feeding roller.

[0116] When the contact area between the material and the feeding rollers is greater than or equal to the third area, adjust the rotation speeds of the first, second, and third feeding rollers simultaneously.

[0117] Preferably, when the contact area between the material and the feeding rollers is greater than or equal to the third area, the rotation speed of the first feeding roller is greater than the rotation speed of the second feeding roller, and the rotation speed of the second feeding roller is greater than the rotation speed of the third feeding roller.

[0118] Or, when the contact area between the material and the material-discharging roller is greater than or equal to the third area, the rotation speeds of the three material-discharging rollers are the same.

[0119] When the contact area between the material and the feed roller is within a certain range, the rotation speed of the feed roller will be adjusted accordingly to better handle the material flow.

[0120] Dynamically adjusting the rotation speed of the feed roller according to the contact area between the material and the feed roller can better adapt to the material flow under different conditions and improve the efficiency and stability of the material flow.

[0121] By timely adjusting the rotation speed of the feeding roller, the blockage and backlog of materials during the transmission process can be effectively reduced, and the continuous operation of the production line can be maintained.

[0122] The rotation speed of the feeding roller can also be adjusted according to the volume of the material at the starting end of the conveyor belt;

[0123] The first image acquisition device obtains the volume of the material at the starting end of the conveyor belt, determines whether the material at the starting end of the conveyor belt exceeds the first volume, and if so, adjusts the rotation speed of the first feed roller, the second feed roller, and the third feed roller;

[0124] If not, the rotation speeds of the first material-digging roller and the second material-digging roller are adjusted, or the rotation speed of the first material-digging roller is adjusted.

[0125] The first volume at this time represents the maximum volume obtained by multiplying the cross-sectional area collected when the material contacts the first, second and third feeding rollers by the height of the material.

[0126] When the volume is at its maximum, the rotation speeds of the first feed roller, the second feed roller and the third feed roller are adjusted simultaneously to improve the efficiency of the production line.

[0127] When the volume is smaller than the first volume, the rotation speed of the first material-digging roller or the first material-digging roller and the second material-digging roller is appropriately adjusted according to the contact area between the material and the material-digging roller.

[0128] It also includes a constant-speed conveyor belt, and a third image acquisition device is fixedly arranged at any position above the constant-speed conveyor belt. At time t, the third image acquisition device collects the cross-sectional area of ​​the material on the constant-speed conveyor belt in real time to calculate the volume of the material on the constant-speed conveyor belt.

[0129] Determine whether the volume of the material on the constant-speed conveyor belt is greater than the set volume. If so, adjust the speed of the conveyor belt according to the volume of the material on the current constant-speed conveyor belt.

[0130] The set volume represents that when the material is conveyed to the constant-speed conveyor belt, the cross-sectional area collected should be the minimum cross-sectional area, and the height of the material is relatively smaller than the height of the material in the storage cabinet and on the conveyor belt. At this time, the material presented on the constant-speed conveyor belt is evenly distributed and stable in different positions. In this way, the purpose of stable final discharge is achieved.

[0131] When the production process does not require manual operation and is fully intelligent, the third image acquisition device can be used to observe in real time whether the volume flow rate of the material on the constant-speed conveyor belt is stable. When it exceeds the set stability standard, a prompt can be issued to indicate that the speed of the conveyor belt and / or the storage cabinet needs to be adjusted.

[0132] By dynamically adjusting the speed of the material distributing roller, the entire production line can maintain a stable operating state under different conditions, thereby optimizing the production process and improving the overall efficiency of the production line.

[0133] The speed values are obtained by using the calculus algorithm to correspondingly adjust the speeds of the storage cabinet and the conveyor belt, making the control more intelligent and precise to meet the production requirements under different conditions.

[0134] The optimized storage cabinet control scheme can effectively improve production efficiency, reduce costs, optimize the production process, realize intelligent production control, and has significant benefits for improving the operating efficiency and product quality of the overall production line.

[0135] As Figure 1 shown, the methods for obtaining the height of the material in different regions include that the first image acquisition device dynamically obtains the material distribution form in different regions of the storage cabinet to establish a material form model, and conducts model training according to the machine learning method of mean clustering.

[0136] After model training, k central heights are obtained, and linear regression training is performed on the k central heights to form a corresponding prediction model.

[0137] The discharge speed of the storage cabinet is intelligently controlled according to the prediction model.

[0138] Through the cloth running of the first image acquisition device, the material distribution form of the storage cabinet is obtained, and the volume information of different regions of the material head (a, b, c), stable (d), and material tail (e, f, g) is calculated. Model training is carried out by using the machine learning method of mean clustering (Kmeans) to reduce the difficulty of data acquisition and expand the sample size. There are at least three material distributing rollers in contact with the material, and its mechanism is affected by factors such as the contact area, the degree of tobacco filament winding, and the water content. Therefore, model training is carried out by using the machine learning method of mean clustering (Kmeans).

[0139] Mean clustering belongs to unsupervised learning in machine learning. By collecting the discharge speeds obtained after the materials at different heights come into contact with the material distributing rollers and performing clustering analysis, k central heights are obtained.

[0140] For k different center heights, corresponding prediction models are formed through linear regression training respectively, and the speed of the bottom belt is intelligently controlled through the prediction models, so that the discharge speed on the bottom belt of the storage cabinet and the conveyor belt speed form a linear negative correlation within a unit time.

[0141] The instantaneous speed value output by the prediction model is written into the PLC electric control program by being transformed into the corresponding frequency conversion voltage value, and the speed of the bottom belt is controlled through intelligent frequency conversion, finally realizing the improvement of the stability of the discharge flow rate.

[0142] A real-time flowmeter is installed on the conveyor belt to dynamically obtain the cross-sectional area information of the real-time flow rate of the conveyor belt, and the real-time flow rate volume information is obtained by combining the transmission speed of the conveyor belt. By adding edge devices to provide relevant data acquisition fusion and computing power, and combining with the LSTM real-time flow control intelligent algorithm, the power motors of the storage cabinet and the conveyor belt are frequency-converted and controlled to achieve a relatively stable material flow rate output on the subsequent constant-speed conveyor belt.

[0143] Through the second image acquisition device on the conveyor belt, real-time flow rate information is obtained. Combining with the real-time speed, the time when the flow rate reaches the end of the conveyor belt is obtained through the LSTM algorithm, and at this time, the motor of the conveyor belt is instantaneously speed-controlled according to the cross-sectional area information obtained by the second image acquisition device, and is written into the PLC electric control program by being transformed into the corresponding frequency conversion voltage value, realizing a relatively stable flow rate stability on the constant-speed conveyor belt.

[0144] Frequency conversion control refers to using a frequency converter (also known as a variable frequency speed regulator, variable frequency regulator) to control the speed of an AC motor, that is, to control the speed of the conveyor belt. By adjusting the frequency and voltage output by the frequency converter, precise control of the motor speed can be achieved. The frequency conversion control system can dynamically adjust the speed of the motor according to needs, thus realizing advantages such as energy saving, smooth operation, and precise control.

[0145] In industrial production, frequency conversion control is often used to regulate conveying equipment, such as conveyor belts, and other equipment that needs to regulate speed. By changing the power supply frequency of the motor, purposes such as regulating the operating speed of the equipment, saving energy, and improving the operating efficiency of the equipment can be achieved.

[0146] The flow rate is calculated in real time according to the cross-sectional area and speed information of the materials on the conveyor belt, including the accumulation situation of the materials on the conveyor belt, the material volume in different regions, etc.; the flow velocity of the materials is calculated, and the speed of the conveyor belt is adjusted according to the calculation results. By continuously collecting and calculating, the speed of the conveyor belt can be precisely controlled at different time periods to meet the stable discharge of materials on the constant-speed conveyor belt in this application. This control process can be realized through the PLC electric control program, thus realizing an automatic frequency conversion control system.

[0147] Whether the materials on the constant-speed conveyor belt are discharged stably is determined according to the volume information of the materials in different areas of the constant-speed conveyor belt. For example, if the volumes of the materials in different areas are within the same set volume range, the effect of constant-flow control is achieved.

[0148] In the method of this application, multiple conveyor belts can be arranged in combination, and at least one conveyor belt at the end can be set as a constant-speed conveyor belt to achieve stable constant flow on the constant-speed conveyor belt.

[0149] During the material transfer process from the storage cabinet to the constant-speed conveyor belt, materials with originally uneven volume sizes or different stacking degrees become evenly distributed on the constant-speed conveyor belt, maintaining a constant flow rate stability on the constant-speed conveyor belt. This setting can be adjusted and optimized according to specific production requirements and material flow characteristics to improve production efficiency and product quality.

[0150] The first image acquisition device and the second image acquisition device are connected in series and operate in coordination. The speed of the storage cabinet and the conveyor belt can be adjusted according to the volume of the materials on the storage cabinet, or the speed of the storage cabinet and the conveyor belt can be adjusted according to the volume of the materials on the conveyor belt. Or in a system with multiple conveyor belt combinations, the motor speeds of other conveyor belts are adjusted at least according to the volume flow rate of the materials on one conveyor belt, so as to achieve precise flow control.

[0151] When the total material flow rate per unit time remains unchanged, the discharging speed of the materials in the storage cabinet is flexibly controlled to meet different requirements in the production process.

[0152] Collect the different heights of the materials in the storage cabinet; perform clustering analysis based on the discharging speeds obtained after the materials at different heights come into contact with the feeding roller to obtain the central height values of the materials in different areas of the storage cabinet;

[0153] The volumes of the materials in different positions correspond to different control algorithms.

[0154] There are at least two conveyor belts. The image acquisition device and the frequency conversion controller between the conveyor belts are connected in series to control the flow rate of the materials on the constant-speed conveyor belt to tend to be stable. The control algorithm includes the LSTM algorithm;

[0155] Main code of the LSTM algorithm:

[0156]

[0157]

[0158]

[0159] The above are only the preferred embodiments of the present invention, and there is no limitation to the present invention in any form. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content prompted above within the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A method for controlling the discharge flow of tobacco leaves from a storage cabinet, characterized in that: Collect the volume of the material at the starting end of the conveyor belt at time T, and adjust the rotation speed of the material roller according to the volume of the material at the starting end of the conveyor belt at time T1; predict the time t when the material at the starting end of the conveyor belt reaches the end of the conveyor belt according to the speed of the conveyor belt, and adjust the speed of the conveyor belt according to the volume of the material at the starting end of the conveyor belt at time t.

2. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 1, characterized in that: Determine whether the volume of the material at the starting end of the conveyor belt is greater than the first volume; If yes, adjust the rotation speed of the first feeding roller, the second feeding roller and the third feeding roller; If not, adjust the rotation speed of the first feeding roller and / or the second feeding roller.

3. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 2, characterized in that: The first image acquisition device acquires the cross-sectional area of ​​the material at the first position of the storage cabinet once every T+t time, calculates the volume of the material according to the cross-sectional area of ​​the material, and adjusts the speed of the storage cabinet according to the volume of the material. The second image acquisition device acquires the cross-sectional area of ​​the material at the starting end of the conveyor belt once every T time, and calculates the volume of the material according to the cross-sectional area of ​​the material.

4. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 3, characterized in that: The first image acquisition device acquires the cross-sectional areas of the material at the first, second and third positions of the storage cabinet at set time intervals, predicts the contact areas between the material and the material transfer roller at the first, second and third positions of the storage cabinet based on the cross-sectional areas, and adjusts the rotation speed of the material transfer roller based on the contact areas between the material and the material transfer roller.

5. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 4, characterized in that: The volume of the material at the first position, the second position, and the third position of the storage cabinet is calculated. When the material reaches the end of the storage cabinet, it is determined whether it is greater than the first volume. If so, the speed of the storage cabinet is adjusted.

6. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 5, characterized in that: Three feeding rollers are coaxially arranged vertically above the end of the storage cabinet. When the feeding rollers come into contact with the materials, the rotation speed of the feeding rollers is adjusted according to the contact area between the materials and the feeding rollers. When the contact area between the material and the material-dispensing roller is greater than or equal to the first area and smaller than the second area, the rotation speed of the first material-dispensing roller is adjusted, and the rotation speeds of the second and third material-dispensing rollers remain unchanged; When the contact area between the material and the material-digging roller is greater than or equal to the first area and smaller than the second area, the rotation speed of the first material-digging roller is greater than the rotation speeds of the second and third material-digging rollers.

7. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 6, characterized in that: When the contact area between the material and the feeding roller is greater than or equal to the second area and less than the third area, the rotation speeds of the first feeding roller and the second feeding roller are adjusted, and the rotation speed of the third feeding roller remains unchanged; When the contact area between the material and the feeding roller is greater than or equal to the second area and less than the third area, the rotation speed of the first feeding roller is greater than the rotation speed of the second feeding roller, and the rotation speed of the second feeding roller is greater than the rotation speed of the third feeding roller.

8. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 7, characterized in that: When the contact area between the material and the material-dispensing roller is greater than or equal to the third area, the rotation speeds of the first, second and third material-dispensing rollers are adjusted simultaneously; When the contact area between the material and the feeding roller is greater than or equal to the third area, the rotation speed of the first feeding roller is greater than the rotation speed of the second feeding roller, and the rotation speed of the second feeding roller is greater than the rotation speed of the third feeding roller; Or, when the contact area between the material and the material-discharging roller is greater than or equal to the third area, the rotation speeds of the three material-discharging rollers are the same.

9. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claim 8, characterized in that: It also includes a constant-speed conveyor belt, and a third image acquisition device is fixedly arranged at any position above the constant-speed conveyor belt. At time t, the third image acquisition device collects the cross-sectional area of ​​the material on the constant-speed conveyor belt in real time to calculate the volume of the material on the constant-speed conveyor belt. Determine whether the volume of the material on the constant-speed conveyor belt is greater than the set volume range. If so, adjust the speed of the conveyor belt according to the volume of the material on the current constant-speed conveyor belt.

10. A method for controlling the discharge flow of tobacco leaves from a storage cabinet according to claims 1-9, characterized in that: The storage cabinet, the conveyor belt, and the constant-speed conveyor belt are arranged in sequence in the horizontal direction. The horizontal plane where the storage cabinet is located is the first horizontal plane, and the horizontal plane where the constant-speed conveyor belt is located is the second horizontal plane. The first horizontal plane is higher than the second horizontal plane; The conveyor belt is tilted, the bottom surface of the conveyor belt forms an angle greater than 30° and less than 60° with the second horizontal plane, the starting end of the conveyor belt is located on the second horizontal plane, and the end of the conveyor belt is higher than the first horizontal plane; A first image acquisition device is arranged above the storage cabinet, and the first image acquisition device moves back and forth in a horizontal direction to acquire the cross-sectional area of ​​the material from the starting end to the end of the storage cabinet; A second image acquisition device is fixedly arranged above the starting end of the conveyor belt, and the second image acquisition device acquires the cross-sectional area of ​​the material at the starting end of the conveyor belt.

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