Intelligent, feedback and linkage storage cabinet discharging control mode

Abstract

The invention discloses an intelligent, feedback and linkage storage cabinet discharging control mode. The control method specifically comprises the following steps that S1, the reference speed is determined according to the feeding amount of a storage cabinet; s2, feedback correction is carried out; s21, the discharging speed is corrected according to the material storage condition in the cabinet; s22, the discharging speed is adjusted according to the height feedback of the materials on the discharging canvas; and S3, equipment linkage. According to the discharging control mode, the feeding amount of the storage cabinet is automatically recognized, the discharging speed is intelligently determined, adjustment is conducted in real time through the distribution rule of materials in the cabinet and mutual matching of the current material discharging stage and height negative feedback of the materials on the discharging canvas, linkage operation with upstream and downstream equipment such as a material stirring roller and a conveying belt is kept, and the discharging speed is controlled. And continuous, stable and efficient discharging of the storage cabinet is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control of tobacco production equipment, and more specifically, relates to an intelligent, feedback, and linkage storage cabinet discharge control method. Background Art

[0002] The storage cabinet is the main storage equipment used in the silk production line. Its main function is to store materials, balance moisture, and alcoholize them. The storage cabinet receives materials from top to bottom in a flat manner through the cloth car and cloth belt, and the materials are stored on the bottom belt of the storage cabinet; when discharging materials, the reducer drives the bottom belt to run, and the materials run horizontally with the bottom belt. After being loosened by the material-discharging roller at the head of the cabinet, they are unloaded to the conveyor belt, and the conveyor belt transports the materials to the downstream process.

[0003] The current operation mode is: before the storage cabinet is discharged, the operator presets the bottom belt running speed, and if necessary, manually adjusts the speed setting again during the production process. This operation mode has many disadvantages. First, the manual setting of the discharge speed is based on subjective experience, lacks scientific rationality, and the discharge efficiency is often low; second, the speed adjustment depends on manual setting, and it is impossible to make timely adjustments to abnormal situations, which is easy to cause blockages and other faults; third, it increases the operating burden of the operator, and each cabinet discharge requires adjustment. Based on the above problems, there is a need for an automatic discharge method for the storage cabinet, which can identify abnormal situations and make timely adjustments to avoid blockages and other faults, thereby ensuring efficient and stable discharge of the storage cabinet. Summary of the invention

[0004] In order to solve the above technical problems existing in the prior art, the present invention provides an intelligent, feedback, and linkage storage cabinet discharge control method. The discharge control mode of the present invention automatically identifies the storage cabinet feed amount and intelligently determines the discharge speed. It makes real-time adjustments through the material distribution law in the cabinet and the mutual matching of the current material discharge stage, and the negative feedback of the height of the material on the discharge canvas, and maintains linkage operation with upstream and downstream equipment such as the material selection roller and the conveyor belt to ensure the continuous, stable and efficient discharge of the storage cabinet.

[0005] The technical solution adopted by the present invention is:

[0006] An intelligent, feedback, linkage storage cabinet discharge control method, characterized in that the control method specifically includes the following steps:

[0007] S1. Determine the reference speed according to the feed amount of the storage tank;

[0008] S2, feedback correction;

[0009] S21, modify the discharging speed according to the material status in the cabinet;

[0010] S22, adjusting the discharging speed according to the material height feedback on the discharging canvas;

[0011] S3, linkage equipment.

[0012] Furthermore, in step S1, the specific process of determining the reference speed according to the feeding amount of the storage cabinet is as follows:

[0013] The storage capacity of the mixing cabinet is:

[0014] W=ρ*l*a*h (1)

[0015] Where ρ is the material density, unit is Kg / m 3 ; l is the storage length of the mixing cabinet, in m; a is the storage width of the mixing cabinet, in m; h is the material storage height of the mixing cabinet, in m;

[0016] The discharge flow rate is:

[0017] Q=ρ*a*h*v (2)

[0018] Among them, v is the speed of the bottom belt of the mixing cabinet, in m / s;

[0019] The downstream packing station's packing capacity is known to be Q 装箱 If the mixing cabinet is used for discharging materials, the discharging flow rate Q = Q 装箱 If the mixing cabinet and the top cabinet discharge materials together, the discharge flow rate Q = Q 装箱 / 2;

[0020] According to the storage volume W and discharge flow rate Q of the mixing cabinet, calculate the discharge time:

[0021] T=W / Q=ρ*l*a*h / (ρ*a*h*v)=l / v (3)

[0022] Then the discharging speed of the bottom belt of the mixing cabinet can be obtained:

[0023] v=Q*l / W (4)

[0024] The motor speed is:

[0025] N1=60*f1*(1-s1) / p1 (5)

[0026] Where f1 is the inverter output frequency, s1 is the slip rate, and p1 is the number of pole pairs of the motor's rotating magnetic field; if i1 is set as the speed ratio of the reducer, the output shaft speed of the reducer is:

[0027] n1=N1 / i1 (6)

[0028] z1 is the number of teeth on the driving sprocket on the output shaft of the reducer, z2 is the number of teeth on the driven sprocket on the bottom belt drive shaft, then the speed of the bottom belt drive shaft is:

[0029] n2=n1*z1 / z2 (7)

[0030] d is the diameter of the bottom belt drive sprocket, in meters, then the bottom belt running speed is equal to the linear speed of the bottom belt drive sprocket, that is,

[0031] v=n2*π*d / 60 (8)

[0032] From this, we can get:

[0033] v=f1*[π*d*z1*(1-s1) / (p1*i1*z2)]=f1*k1 (9)

[0034] Among them, k1=π*d*z1*(1-s1) / (p1*i1*z2), for a specific drive system, k1 is a constant, that is, the bottom belt running speed is proportional to the motor running frequency;

[0035] Therefore, when the storage volume of the mixing cabinet is W and the discharge flow rate is Q, the base frequency of the cabinet bottom belt drive motor is:

[0036] f 基准 =v / k=Q*l / (W*k1) (10)

[0037] Furthermore, in step S21, the specific process of correcting the discharge speed according to the material status in the cabinet is as follows:

[0038] Given the characteristics of material storage in the mixing cabinet, the whole cabinet can be divided into five discharging stages according to the material height in the discharging direction: pre-filling, material head, normal material, material tail, and material empty. The current discharging stage variable is

[0039] G=[G1,G2,G3,G4,G5] (11)

[0040] The above five stages G are divided based on the length b of the material on the bottom belt from the discharge port in the discharge direction, and the division variables are:

[0041] B=[b1,b2,b3,b4] (12)

[0042] The current discharge length is:

[0043] b=π*d*n3 / Num (13)

[0044] Among them, n3 is the number of pulses triggered by the encoder on the bottom belt drive shaft, and Num is the number of pulses triggered by the encoder when the bottom belt drive shaft rotates one circle;

[0045] According to the actual discharge state, there is only one G value of 1 at any time. If b<b1, then G1=1; when b∈[b i-1 ,b i ), then G i=1, where 2≤i≤4; when b>b4, G5=1;

[0046] Define the bottom belt speed correction variables for each stage:

[0047] X=[X1,X2,X3,X4,X5] T (14)

[0048] Among them, X i G i The correction variable value of the discharge stage, 1≤i≤5; multiply the discharge stage variable G by the bottom belt speed correction variable X of each stage to obtain the cabinet storage speed correction coefficient:

[0049] C=G*X=[G1,G2,G3,G4,G5]*[X1,X2,X3,X4,X5] T (15)

[0050] According to the cabinet bottom belt drive motor running base frequency f 基准 , the correction coefficient C of the material in the cabinet, and the correction value of the frequency of the material discharging operation at the bottom of the cabinet are obtained:

[0051] f 修正 =f 基准 *C (16).

[0053] Furthermore, in step S22, the specific process of adjusting the discharge speed according to the material height feedback on the discharge canvas includes:

[0054] The material height h on the conveyor belt 实时 to reflect the current discharge volume flow, and the transmission equipment capacity is based on the material height h 标准 When the mixing cabinet is discharging materials, the material level sensor located at the discharging conveyor belt measures the material height h on the conveyor belt in real time. 实时 The material height data is transmitted to PLC, and PLC determines the real-time height of the material. 实时 Standard discharge height h 标准 The difference △h is used to adjust the setting frequency f of the bottom belt drive inverter. 调整 =f 修正 +△f, thereby adjusting the discharge speed of the bottom belt of the mixing cabinet to control the material height on the discharge conveyor belt to remain stable.

[0055] Furthermore, in step S3, the specific process of linking the devices is as follows:

[0056] The speed of the reduction motor is:

[0057] N2=60*f2*(1-s2) / p2 (17)

[0058] It is known that the reduction ratio of the reduction motor is i2, then the output shaft speed of the reduction motor is:

[0059] n3=N2 / i2 (18)

[0060] Set the number of teeth on the gear on the output shaft of the reduction motor and the gear on the feed roller shaft to z3 and z4 respectively, and the feed roller speed can be obtained:

[0061] n4=n3*z3 / z4 (19)

[0062] According to the matching linkage principle, the bottom belt travels a fixed distance S 固定 , the feeding roller rotates one circle, that is, the running time of the two is equal, as follows:

[0063] t=S 固 Fixed / v=60 / n4 (20)

[0064] Among them, v is the bottom belt running speed. According to the equation, the driving frequency of the feed roller inverter can be obtained:

[0065] f2=f 修正 *k1 / (k2*S 固定 ) (twenty one)

[0066] k2=(1-s2)*z3 / (p2*i2*z4) (22)

[0067] From this, we can see that k1 and k2 are constants. 固定 Under certain conditions, the operating frequency of the feed roller inverter is proportional to the operating frequency of the bottom belt motor inverter, that is, the speed of the feed roller is proportional to the running speed of the bottom belt.

[0068] Furthermore, in step S3, in order to prevent the discharge from being blocked, the speed of the roller is optimized at different bottom belt speeds, as follows:

[0069] The frequency of the inverter is f 调整 Identify the bottom belt running speed and define the boundary frequency f 慢 、f 快 , where 0<f 慢 <f 快 <50;

[0070] When f 修正 ∈[0,f 慢 ], it is the slow discharging stage U1;

[0071] When f 修正 ∈(f 慢 , f 快 ], it is the normal speed discharging stage U2;

[0072] When f修正 ∈(f 快 ,50], it is the rapid discharging stage U3;

[0073] For the discharging stage U at different speeds, the optimization coefficient β is defined, and the optimized speed of the roller is:

[0074] f 优化 =f2*U*β=f2*[U1,U2,U3]*[β1,β2,β3] T (twenty three).

[0076] Furthermore, in step S3, the specific process of linking the devices also includes:

[0077] In order to ensure stable discharge, the transmission efficiency of the conveyor belt is monitored, and the discharge speed is adjusted according to the real-time transmission efficiency; the belt slip detection device installed on each conveyor belt transmits the monitoring signal to the PLC, and the PLC calculates the belt transmission efficiency η in real time according to the monitoring signal, where 0≤η≤1, and the closer η is to 1, the higher the belt transmission efficiency;

[0078] When η=1, the belt does not slip; the total transmission efficiency of the conveyor belt is:

[0079] η 总 ={(y1,η1),(y2,η2),…,(y j ,η j )} (twenty four)

[0080] Among them, y is the conveyor belt identification, j is the number of conveyor belts;

[0081] For different conveyor belts y, different belt transmission efficiency values ​​η are defined 警告 , η 动作 , η 停止 , where η 警告 >η 动作 >η 停止 ;

[0082] When η 动作 <η≤η 警告 When the system prompts that the corresponding conveyor belt is transmitting abnormally;

[0083] When η 停止 <η≤η 动作 When the conveyor belt transmission efficiency drops significantly, the bottom belt speed of the storage cabinet is adjusted accordingly. At this time, the negative feedback control of the material height of the discharge conveyor belt is disabled, and the setting frequency of the bottom belt drive inverter is:

[0084] f 联动 =(η-0.1)*f 修正 (25)

[0085] When η≤η停止 When the belt slips severely, the bottom belt stops discharging materials;

[0086] When η>η 警告 When the storage cabinet resumes discharging, the negative feedback control of the material height of the discharging conveyor belt is re-enabled.

[0087] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0088] 1. The present invention converts the discharging speed of the storage cabinet by the feeding amount of the storage cabinet, which replaces the manual operation and reduces the operating burden. The automatic calculation result is more accurate and reasonable than the manual preset result. At the same time, the current discharging position is calculated according to the feedback signal of the encoder, and combined with the accumulation condition of the material inside the storage cabinet, the real-time adjustment that cannot be achieved by manual operation is realized.

[0089] 2. The present invention utilizes the material level sensor on the discharging canvas to monitor the material height, and the PLC adjusts the discharging speed according to the difference between the data and the standard discharging height, which is easy to maintain a stable material flow rate out of the cabinet and is more conducive to efficient discharging of the storage cabinet.

[0090] 3. The present invention is not limited to the individual adjustment of the discharging speed of the storage cabinet. By matching the speed of the material-discharging roller and monitoring the transmission efficiency of the conveyor belt, a discharging system in which upstream and downstream equipment are linked is formed. The operating status of each device in the discharging system is fed back and adjusted in real time, thereby effectively avoiding blockages and other faults caused by the lack of linkage between the front and rear equipment, and maintaining the continuous and stable operation of the discharging process. At the same time, the material crushing is maintained at a low level to improve the product process quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 Schematic diagram of the storage cabinet discharge system structure.

[0092] Figure 2 Schematic diagram of the discharge speed control process of the storage cabinet bottom belt. DETAILED DESCRIPTION

[0093] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0094] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0095] The present invention will be described in detail below in conjunction with exemplary embodiments with reference to the accompanying drawings.

[0096] Example 1

[0097] refer to Figure 2The present invention provides an intelligent, feedback, linkage storage cabinet discharge control method, the control method specifically comprises the following steps:

[0098] S1. Determine the reference speed according to the feed amount of the storage tank;

[0099] In step S1, the specific process of determining the reference speed according to the feeding amount of the storage tank is as follows:

[0100] The storage capacity of the mixing cabinet is:

[0101] W=ρ*l*a*h (1)

[0102] Where ρ is the material density, unit is Kg / m 3 ; l is the storage length of the mixing cabinet, in m; a is the storage width of the mixing cabinet, in m; h is the material storage height of the mixing cabinet, in m;

[0103] The discharge flow rate is:

[0104] Q=ρ*a*h*v (2)

[0105] Among them, v is the speed of the bottom belt of the mixing cabinet, in m / s;

[0106] The downstream packing station's packing capacity is known to be Q 装箱 If the mixing cabinet is used for discharging materials, the discharging flow rate Q = Q 装箱 If the mixing cabinet and the top cabinet discharge materials together, the discharge flow rate Q = Q 装箱 / 2;

[0107] According to the storage volume W and discharge flow rate Q of the mixing cabinet, calculate the discharge time:

[0108] T=W / Q=ρ*l*a*h / (ρ*a*h*v)=l / v (3)

[0109] Then the discharging speed of the bottom belt of the mixing cabinet can be obtained:

[0110] v=Q*l / W (4)

[0111] The motor speed is:

[0112] N1=60*f1*(1-s1) / p1 (5)

[0113] Where f1 is the inverter output frequency, s1 is the slip rate, and p1 is the number of pole pairs of the motor's rotating magnetic field; if i1 is set as the speed ratio of the reducer, the output shaft speed of the reducer is:

[0114] n1=N1 / i1 (6)

[0115] z1 is the number of teeth on the driving sprocket on the output shaft of the reducer, z2 is the number of teeth on the driven sprocket on the bottom belt drive shaft, then the speed of the bottom belt drive shaft is:

[0116] n2=n1*z1 / z2 (7)

[0117] d is the diameter of the bottom belt drive sprocket, in meters, then the bottom belt running speed is equal to the linear speed of the bottom belt drive sprocket, that is,

[0118] v=n2*π*d / 60 (8)

[0119] From this, we can get:

[0120] v=f1*[π*d*z1*(1-s1) / (p1*i1*z2)]=f1*k1 (9)

[0121] Among them, k1=π*d*z1*(1-s1) / (p1*i1*z2), for a specific drive system, k1 is a constant, that is, the bottom belt running speed is proportional to the motor running frequency;

[0122] Therefore, when the storage volume of the mixing cabinet is W and the discharge flow rate is Q, the base frequency of the cabinet bottom belt drive motor is:

[0123] f 基准 =v / k=Q*l / (W*k1) (10)

[0124] Furthermore, in step S21, the specific process of correcting the discharge speed according to the material status in the cabinet is as follows:

[0125] Given the characteristics of material storage in the mixing cabinet, the whole cabinet can be divided into five discharging stages according to the material height in the discharging direction: pre-filling, material head, normal material, material tail, and material empty. The current discharging stage variable is

[0126] G=[G1,G2,G3,G4,G5] (11)

[0127] The above five stages G are divided based on the length b of the material on the bottom belt from the discharge port in the discharge direction, and the division variables are:

[0128] B=[b1,b2,b3,b4] (12)

[0129] The current discharge length is:

[0130] b=π*d*n3 / Num (13)

[0131] Among them, n3 is the number of pulses triggered by the encoder on the bottom belt drive shaft, and Num is the number of pulses triggered by the encoder when the bottom belt drive shaft rotates one circle;

[0132] According to the actual discharge state, there is only one G value of 1 at any time. If b<b1, then G1=1; when b∈[b i-1 ,b i ), then G i =1, where 2≤i≤4; when b>b4, G5=1;

[0133] Define the bottom belt speed correction variables for each stage:

[0134] X=[X1,X2,X3,X4,X5] T (14)

[0135] Among them, X i G i The correction variable value of the discharge stage, 1≤i≤5; multiply the discharge stage variable G by the bottom belt speed correction variable X of each stage to obtain the cabinet storage speed correction coefficient:

[0136] C=G*X=[G1,G2,G3,G4,G5]*[X1,X2,X3,X4,X5] T (15)

[0137] According to the cabinet bottom belt drive motor running base frequency f 基准 , the correction coefficient C of the material in the cabinet, and the correction value of the frequency of the material discharging operation at the bottom of the cabinet are obtained:

[0138] f 修正 =f 基准 *C (16).

[0140] S2, feedback correction;

[0141] S21, modify the discharging speed according to the material status in the cabinet;

[0142] S22, adjusting the discharging speed according to the material height feedback on the discharging canvas;

[0143] In step S22, the specific process of adjusting the discharge speed according to the material height feedback on the discharge canvas includes:

[0144] The material height h on the conveyor belt 实时 to reflect the current discharge volume flow, and the transmission equipment capacity is based on the material height h 标准 When the mixing cabinet is discharging materials, the material level sensor located at the discharging conveyor belt measures the material height h on the conveyor belt in real time. 实时 The material height data is transmitted to PLC, and PLC determines the real-time height of the material. 实时 Standard discharge height h 标准 The difference △h is used to adjust the setting frequency f of the bottom belt drive inverter. 调整 =f 修正+△f, thereby adjusting the discharge speed of the bottom belt of the mixing cabinet to control the material height on the discharge conveyor belt to remain stable.

[0145] S3, linkage equipment.

[0146] In step S3, the specific process of linking the devices is as follows:

[0147] There are several groups of feeding roller unloading devices at the storage cabinet discharge port. When the storage cabinet is discharged, the feeding roller rotates, and the feeding device on the feeding roller loosens the material to ensure continuous and stable material discharge. The speed of the feeding roller has a great influence on the discharge state and process quality of the storage cabinet. If the speed is too fast, the material will be severely broken; if the speed is too slow, the discharge will be uneven and easy to be blocked. Therefore, the speed of the feeding roller should match the discharge speed of the bottom belt and change with the change of the bottom belt speed.

[0148] The speed of the reduction motor is:

[0149] N2=60*f2*(1-s2) / p2 (17)

[0150] It is known that the reduction ratio of the reduction motor is i2, then the output shaft speed of the reduction motor is:

[0151] n3=N2 / i2 (18)

[0152] Set the number of teeth on the gear on the output shaft of the reduction motor and the gear on the feed roller shaft to z3 and z4 respectively, and the feed roller speed can be obtained:

[0153] n4=n3*z3 / z4 (19)

[0154] According to the matching linkage principle, the bottom belt travels a fixed distance S 固定 , the feeding roller rotates one circle, that is, the running time of the two is equal, as follows:

[0155] t=Sfixed / v=60 / n4 (20)

[0156] Among them, v is the bottom belt running speed. According to the equation, the driving frequency of the feed roller inverter can be obtained:

[0157] f2=f 修正 *k1 / (k2*S 固定 ) (twenty one)

[0158] k2=(1-s2)*z3 / (p2*i2*z4) (22)

[0159] From this, we can see that k1 and k2 are constants. 固定 Under certain conditions, the operating frequency of the feed roller inverter is proportional to the operating frequency of the bottom belt motor inverter, that is, the speed of the feed roller is proportional to the running speed of the bottom belt.

[0160] In order to prevent the discharge from being blocked, the speed of the roller is optimized at different bottom belt speeds, as follows:

[0161] The frequency of the inverter is f 调整 Identify the bottom belt running speed and define the boundary frequency f 慢 、f 快 , where 0<f 慢 <f 快 <50;

[0162] When f 修正 ∈[0,f 慢 ], it is the slow discharging stage U1;

[0163] When f 修正 ∈(f 慢 , f 快 ], it is the normal speed discharging stage U2;

[0164] When f 修正 ∈(f 快 ,50], it is the rapid discharging stage U3;

[0165] For the discharging stage U at different speeds, the optimization coefficient β is defined, and the optimized speed of the roller is:

[0166] f 优化 =f2*U*β=f2*[U1,U2,U3]*[β1,β2,β3] T (twenty three).

[0168] The specific process of linkage equipment also includes:

[0169] The material is thrown loosely onto the conveyor belt by the feeding roller, and then transported to the packing station by multiple conveyor belts for packing. As the only material transportation path, the conveyor belt has a great influence on the packing stability due to its transmission efficiency. If the conveyor belt transmission efficiency is insufficient, that is, the conveyor belt slips, the material discharge will be blocked, and the material will accumulate on the conveyor belt, causing blockage.

[0170] In order to ensure stable discharge, the transmission efficiency of the conveyor belt is monitored, and the discharge speed is adjusted according to the real-time transmission efficiency; the belt slip detection device installed on each conveyor belt transmits the monitoring signal to the PLC, and the PLC calculates the belt transmission efficiency η in real time according to the monitoring signal, where 0≤η≤1, and the closer η is to 1, the higher the belt transmission efficiency;

[0171] When η=1, the belt does not slip; the total transmission efficiency of the conveyor belt is:

[0172] η 总 ={(y1,η1),(y2,η2),…,(y j,η j )} (twenty four)

[0173] Among them, y is the conveyor belt identification, j is the number of conveyor belts;

[0174] For different conveyor belts y, different belt transmission efficiency values ​​η are defined 警告 , η 动作 , η 停止 , where η 警告 >η 动作 >η 停止 ;

[0175] When η 动作 <η≤η 警告 When the system prompts that the corresponding conveyor belt is transmitting abnormally;

[0176] When η 停止 <η≤η 动作 When the conveyor belt transmission efficiency drops significantly, the bottom belt speed of the storage cabinet is adjusted accordingly. At this time, the negative feedback control of the material height of the discharge conveyor belt is disabled, and the setting frequency of the bottom belt drive inverter is:

[0177] f 联动 =(η-0.1)*f 修正 (25)

[0178] When η≤η 停止 When the belt slips severely, the bottom belt stops discharging materials;

[0179] When η>η 警告 When the storage cabinet resumes discharging, the negative feedback control of the material height of the discharging conveyor belt is re-enabled.

[0180] Example 2

[0181] refer to Figure 1 The storage cabinet discharging system comprises a storage cabinet body 1, a bottom belt 2 is installed at the bottom of the storage cabinet body 1, a plurality of material-pickling rollers 5 are installed inside the storage cabinet body 2, and the material-pickling rollers 5 are driven by a reduction motor through a chain transmission, and the reduction motor is driven by a frequency converter; a discharging port is opened on one side of the bottom of the storage cabinet body, and one end of the bottom belt 2 is located above the discharging port; driving shafts are arranged on both sides of the bottom belt 2, which are driven by a reduction motor through a chain transmission, and the reduction motor is driven by a frequency converter, and an encoder 4 is installed on the driving shaft; a conveyor belt 6 is arranged below the discharging port, a slip monitoring device 7 is arranged on the driven shaft of the conveyor belt 6, and a material level height sensor 8 is arranged on the conveyor belt 6;

[0182] The reduction motor, the frequency converter, the slip monitoring device 7, the encoder and the material level sensor 8 are all connected to the controller for control.

[0183] Among them, the slip monitoring device has been disclosed in Chinese patent application number 2024102086689.

[0184] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An intelligent, feedback, linkage storage cabinet discharge control method, characterized in that: The control method specifically comprises the following steps: S1. Determine the reference speed according to the feed amount of the storage tank; S2, feedback correction; S21, modify the discharging speed according to the material status in the cabinet; S22, adjusting the discharging speed according to the material height feedback on the discharging canvas; S3, linkage equipment.

2. An intelligent, feedback, linkage storage cabinet discharge control method as claimed in claim 1, characterized in that: In step S1, the specific process of determining the reference speed according to the feeding amount of the storage tank is as follows: The storage capacity of the mixing cabinet is: W=ρ*l*a*h (1) Where ρ is the material density, in kg / m 3 ; l is the storage length of the mixing cabinet, in m; a is the storage width of the mixing cabinet, in m; h is the material storage height of the mixing cabinet, in m; The discharge flow rate is: Q=ρ*a*h*v (2) Among them, v is the speed of the bottom belt of the mixing cabinet, in m / s; The downstream packing station's packing capacity is known to be Q 装箱 If the mixing cabinet is used for discharging materials, the discharging flow rate Q = Q 装箱 If the mixing cabinet and the top cabinet discharge materials together, the discharge flow rate Q = Q 装箱 / 2; According to the storage volume W of the mixing cabinet and the discharge flow rate Q, calculate the discharge time: T=W / Q=ρ*l*a*h / (ρ*a*h*v)=l / v (3) Then the discharging speed of the bottom belt of the mixing cabinet can be obtained: v=Q*l / W (4) The motor speed is: N1=60*f1*(1-s1) / p1 (5) Where f1 is the inverter output frequency, s1 is the slip rate, and p1 is the number of pole pairs of the motor's rotating magnetic field; if i1 is set as the speed ratio of the reducer, the output shaft speed of the reducer is: n1=N1 / i1 (6) z1 is the number of teeth on the driving sprocket on the output shaft of the reducer, z2 is the number of teeth on the driven sprocket on the bottom belt drive shaft, then the speed of the bottom belt drive shaft is: n2=n1*z1 / z2 (7) d is the diameter of the bottom belt drive sprocket, in meters, then the bottom belt running speed is equal to the linear speed of the bottom belt drive sprocket, that is, v=n2*π*d / 60 (8) From this, we can get: v=f1*[π*d*z1*(1-s1) / (p1*i1*z2)]=f1*k1 (9) Among them, k1=π*d*z1*(1-s1) / (p1*i1*z2), for a specific drive system, k1 is a constant, that is, the bottom belt running speed is proportional to the motor running frequency; Therefore, when the storage volume of the mixing cabinet is W and the discharge flow rate is Q, the base frequency of the cabinet bottom belt drive motor is: f 基准 =v / k=Q*l / (W*k1) (10)。 3. An intelligent, feedback, linkage storage cabinet discharge control method as claimed in claim 1, characterized in that: In step S21, the specific process of correcting the discharge speed according to the material status in the cabinet is as follows: Given the characteristics of material storage in the mixing cabinet, the whole cabinet can be divided into five discharging stages according to the material height in the discharging direction: pre-filling, material head, normal material, material tail, and material empty. The current discharging stage variable is G=[G1,G2,G3,G4,G5] (11) The above five stages G are divided based on the length b of the material on the bottom belt from the discharge port in the discharge direction, and the division variables are: B=[b1,b2,b3,b4] (12) The current discharge length is: b=π*d*n3 / Num (13) Among them, n3 is the number of pulses triggered by the encoder on the bottom belt drive shaft, and Num is the number of pulses triggered by the encoder when the bottom belt drive shaft rotates one circle; According to the actual discharge state, there is only one G value of 1 at any time. If b<b1, then G1=1; when b∈[b i-1 ,b i ), then G i =1, where 2≤i≤4; when b>b4, G5=1; Define the bottom belt speed correction variables for each stage: X=[X1,X2,X3,X4,X5] T (14) Among them, X i G i The correction variable value of the discharge stage, 1≤i≤5; multiply the discharge stage variable G by the bottom belt speed correction variable X of each stage to obtain the cabinet storage speed correction coefficient: C=G*X=[G1,G2,G3,G4,G5]*[X1,X2,X3,X4,X5] T (15) According to the cabinet bottom belt drive motor running base frequency f 基准 , the correction coefficient C of the material in the cabinet, and the correction value of the frequency of the material discharging operation at the bottom of the cabinet are obtained: f 修正 =f 基准 *C (16)。 4. An intelligent, feedback, linkage storage cabinet discharge control method as claimed in claim 1, characterized in that: In step S22, the specific process of adjusting the discharge speed according to the material height feedback on the discharge canvas includes: The material height h on the conveyor belt 实时 to reflect the current discharge volume flow, and the transmission equipment capacity is based on the material height h 标准 When the mixing cabinet is discharging materials, the material level sensor located at the discharging conveyor belt measures the material height h on the conveyor belt in real time. 实时 The material height data is transmitted to PLC, and PLC determines the real-time height of the material. 实时 Standard discharge height h 标准 The difference Δh is used to adjust the set frequency f of the bottom belt drive inverter. 调整 =f 修正 +Δf, thereby adjusting the discharge speed of the bottom belt of the mixing cabinet to control the material height on the discharge conveyor belt to remain stable.

5. An intelligent, feedback, linkage storage cabinet discharge control method as claimed in claim 1, characterized in that: In step S3, the specific process of linking the devices is as follows: The speed of the reduction motor is: N2=60*f2*(1-s2) / p2 (17) It is known that the reduction ratio of the reduction motor is i2, then the output shaft speed of the reduction motor is: n3=N2 / i2 (18) Set the number of teeth on the gear on the output shaft of the reduction motor and the gear on the feed roller shaft to z3 and z4 respectively, and the feed roller speed can be obtained: n4=n3*z3 / z4 (19) According to the matching linkage principle, the bottom belt travels a fixed distance S 固定 , the feeding roller rotates one circle, that is, the running time of the two is equal, as follows: t=Sfixed / v=60 / n4 (20) Among them, v is the bottom belt running speed. According to the equation, the driving frequency of the feed roller inverter can be obtained: f2=f 修正 *k1 / (k2*S 固定 ) (21) k2=(1-s2)*z3 / (p2*i2*z4) (22) From this, we can see that k1 and k2 are constants. 固定 Under certain conditions, the operating frequency of the feed roller inverter is proportional to the operating frequency of the bottom belt motor inverter, that is, the speed of the feed roller is proportional to the running speed of the bottom belt.

6. An intelligent, feedback, linkage storage cabinet discharge control method as claimed in claim 3, characterized in that: In step S3, in order to prevent the discharge from being blocked, the speed of the roller is optimized at different bottom belt speeds, as follows: The frequency of the inverter is f 调整 Identify the bottom belt running speed and define the boundary frequency f 慢 、f 快 , where 0<f 慢 <f 快 <50; When f 修正 ∈[0,f 慢 ], it is the slow discharging stage U1; When f 修正 ∈(f 慢 , f 快 ], it is the normal speed discharging stage U2; When f 修正 ∈(f 快 ,50], it is the rapid discharging stage U3; For the discharging stage U at different speeds, the optimization coefficient β is defined, and the optimized speed of the roller is: f 优化 =f2*U*β=f2*[U1,U2,U3]*[β1,β2,β3] T (23).

7. An intelligent, feedback, linkage storage cabinet discharge control method as claimed in claim 1, characterized in that: In step S3, the specific process of linking the devices also includes: In order to ensure stable discharge, the transmission efficiency of the conveyor belt is monitored, and the discharge speed is adjusted according to the real-time transmission efficiency; the belt slip detection device installed on each conveyor belt transmits the monitoring signal to the PLC, and the PLC calculates the belt transmission efficiency η in real time according to the monitoring signal, where 0≤η≤1, and the closer η is to 1, the higher the belt transmission efficiency; When η=1, the belt does not slip; the total transmission efficiency of the conveyor belt is: or 总 ={(y1,η1),(y2,η2),…,(y j ,or j )} (24) Among them, y is the conveyor belt identification, j is the number of conveyor belts; For different conveyor belts y, different belt transmission efficiency values ​​η are defined 警告 , η 动作 , η 停止 , where η 警告 >η 动作 >η 停止 ; When η 动作 <η≤η 警告 When the system prompts that the corresponding conveyor belt is transmitting abnormally; When η 停止 <η≤η 动作 When the conveyor belt transmission efficiency drops significantly, the bottom belt speed of the storage cabinet is adjusted accordingly. At this time, the negative feedback control of the material height of the discharge conveyor belt is disabled, and the setting frequency of the bottom belt drive inverter is: f 联动 =(η-0.1)*f 修正 (25) When η≤η 停止 When the belt slips severely, the bottom belt stops discharging materials; When η>η 警告 When the storage cabinet resumes discharging, the negative feedback control of the material height of the discharging conveyor belt is re-enabled.

Images