Cotton supply control system and control method for multi-bin cotton blender machine

Abstract

The invention provides a cotton supply control system and control method for a multi-bin cotton blender machine, and the system comprises a bale plucker, an axial flow opener, a multi-bin cotton blender machine, a scutcher, a carding machine and a control system, the control system is connected with controllers of the bale plucker, the axial flow opener, the multi-bin cotton blender machine, the scutcher and the carding machine; control ends of a pressure sensor arranged in a cabin of the multi-cabin cotton blender machine, a cotton position photoelectric sensor arranged in a cotton storage box of the scutcher, an inclined curtain variable frequency motor and a flat curtain variable frequency motor are all connected with the control system, and the control system is characterized by comprising a human-computer interface and a CPU (central processing unit) programmable controller; the CPU programmable controller comprises a backward-stage cotton supply amount calculation control module, a forward-stage cotton supply amount calculation control module, an operation efficiency calculation adjustment module and a variable frequency motor control module. The self-adaptive predictive control technology is adopted, cotton supply quantity predictive control and automatic operation efficiency adjustment are combined, cotton supply quantity dynamic balance is achieved, the number of times of starting and stopping of a motor is reduced, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile machinery manufacturing, and relates to a cotton supply amount and efficiency control of a multi-bin blending cotton machine in a textile blowing and carding system, in particular to a cotton supply control system and control method of a multi-bin blending cotton machine. BACKGROUND

[0002] At present, the basic type multi-bin blending cotton machine with simultaneous feeding and different outputs in the blowing and carding process mainly feeds the raw material through flat and inclined screens, and when the back stage is configured as a fine opening cotton machine, the cotton is supplied according to the cotton demand signal of the back stage. When the back stage needs cotton, the inclined screen motor starts to feed the raw material to the cotton conveying pipeline and into the back stage equipment. The flat screen starts and stops following the inclined screen to convey the raw material in the cotton bin to the inclined screen; and when there is no cotton demand signal, it stops. The current cotton supply method is manually set by the operator according to experience, and the running speed depends on manual adjustment, which cannot be automatically adjusted according to the running demand and efficiency, the motor starts and stops frequently, the amount of conveyed raw material is not uniform enough, and the carding machine affects the uneven rate of sliver.

[0003] Therefore, there is an urgent need for a cotton supply control system and control method of a multi-bin blending cotton machine, which adopts adaptive predictive control, does not require manual intervention throughout the process, combines cotton supply amount predictive control and efficiency automatic adjustment, and achieves dynamic balance of cotton supply amount and efficiency improvement. SUMMARY

[0004] To solve the above problems in the prior art, the present application provides a cotton supply control system and control method of a multi-bin blending cotton machine, which adopts adaptive predictive control technology, combines cotton supply amount predictive control and running efficiency automatic adjustment, achieves dynamic balance of cotton supply amount, reduces the number of motor starts and stops, and improves production efficiency.

[0005] The purpose of the present application is achieved by the following technical solutions: A cotton supply control system of a multi-bin blending cotton machine, comprising a cotton grabbing machine, an axial flow opener, a multi-bin blending cotton machine, a scutcher, a carding machine and a control system, wherein the multi-bin blending cotton machine comprises an input pipeline, a material conveying groove, an inclined screen, a flat screen, a blending cotton bin and an output pipeline, the control system is connected with the controllers of the cotton grabbing machine, the axial flow opener, the multi-bin blending cotton machine, the scutcher and the carding machine, the control ends of the pressure sensor arranged in the bin of the multi-bin blending cotton machine, the cotton position photoelectric sensor arranged in the cotton storage box of the scutcher, the variable frequency motor of the inclined screen and the variable frequency motor of the flat screen are connected with the control system, and the control system comprises a man-machine interface and a CPU programmable controller, the man-machine interface is connected with the CPU programmable controller, and the CPU programmable controller comprises a cotton supply amount calculation control module for the back stage, a cotton demand calculation control module for the front stage, a running efficiency calculation adjustment module and a variable frequency motor control module. The man-machine interface is used for inputting process parameters of the equipment and receiving signals of the equipment, and the process parameters include a set target efficiency. The backward stage cotton supply amount calculation control module is used for reading the number of running carding machines and the output of each carding machine and calculating the cotton supply demand, calculating the flat lap conveyor speed with the cotton supply demand and the cotton storage amount in the blending bin, and adjusting and controlling the running speed and start-stop of the inclined lap variable frequency motor and the flat lap variable frequency motor through the variable frequency motor control module, and stably supplying cotton to the backward stage equipment through the inclined lap. The forward stage cotton demand calculation control module is used for calculating the cotton demand of the forward stage equipment according to the cotton storage amount in the blending bin, and controlling and adjusting the raw material output of the forward stage equipment to be consistent with the cotton demand of the forward stage equipment. The running efficiency calculation adjustment module is used for detecting the actual running efficiency of the inclined lap and the flat lap, comparing and calculating with the set target efficiency, and adjusting and controlling the running speed and start-stop of the inclined lap variable frequency motor and the flat lap variable frequency motor through the variable frequency motor control module, so that the actual running efficiency is consistent with the set target efficiency. The variable frequency motor control module is used for automatically controlling and adjusting the rotating speed and start-stop of the inclined lap variable frequency motor and the flat lap variable frequency motor according to the instructions sent by the CPU programmable controller.

[0006] The control method of the cotton supply control system of the multi-bin blending cotton machine, characterized in that the control method comprises a cotton supply amount control method and a running efficiency control method, the cotton supply amount control method comprises a normal cotton supply method of the blending bin and an empty cotton supply method of the blending bin, and the normal cotton supply method of the blending bin comprises the following steps: Step 1: when starting normal operation, first calculate the appropriate cotton supply demand according to the number of running carding machines and the output of each carding machine; Step 2: calculate the flat lap conveyor speed with the cotton supply demand and the cotton storage amount in the blending bin, adjust and control the running speed and start-stop of the inclined lap variable frequency motor and the flat lap variable frequency motor, run at the calculated flat lap conveyor speed, and stably supply cotton to the backward stage equipment through the inclined lap; Step 3: judge the amount of cotton in the cotton storage box of the cleaning machine according to the shielding condition of the photoelectric sensor in the cotton storage box, adjust and control the running speed and start-stop of the inclined lap variable frequency motor and the flat lap variable frequency motor, and realize slow cotton supply, fast cotton supply or stop cotton supply; Step 4: calculate the cotton storage amount in the blending bin according to the pressure in the blending bin and the full-bin pressure of the blending bin, adjust the amount of cotton demanded by the forward-positioned grabber, when the cotton storage amount in the blending bin is low, control the grabber to increase the forward-stage cotton supply amount to the blending bin, when the cotton storage amount in the blending bin is high, control the grabber to reduce the forward-stage cotton supply amount to the blending bin, and when the pressure in the blending bin reaches the upper limit, stop the cotton demand to the grabber.

[0007] Improvements on the above technical solutions: the calculation methods of the cotton supply amount of the multi-bin blending cotton machine and the cotton demand of the carding machine are as follows: Cotton requirement per unit time = number of operating cards × output per card × (1 + percentage of impurities) Cotton supply per unit time = current cotton storage in the blending chamber × flat apron linear speed / length of the blending chamber Cotton storage in the blending chamber = full cotton storage in the blending chamber × (current pressure in the blending chamber / pressure when the blending chamber is full + compensation coefficient) The required flat apron linear speed V1 is calculated from "cotton supply per unit time = cotton requirement per unit time". The power supply frequency f1 of the flat apron variable frequency motor is calculated according to the required flat apron linear speed V1 and the speed reduction ratio of the flat apron variable frequency motor. The power supply frequency f2 of the inclined apron variable frequency motor = power supply frequency f1 of the flat apron variable frequency motor / percentage of the flat apron tracking inclined apron frequency.

[0008] Further improvement of the above technical solution: in step 4, the proportional relationship between the cotton storage in the blending chamber and the previous cotton supply is as follows: (1) Cotton storage in the blending chamber: 91%-100%, previous cotton supply: 70% (2) Cotton storage in the blending chamber: 86%-90%, previous cotton supply: 80% (3) Cotton storage in the blending chamber: 81%-85%, previous cotton supply: 90% (4) Cotton storage in the blending chamber: 76%-80%, previous cotton supply: 100% (5) Cotton storage in the blending chamber: 71%-75%, previous cotton supply: 110% (6) Cotton storage in the blending chamber: 0%-70%, previous cotton supply: 120% The previous cotton supply of 100% is the value when the previous cotton supply in the blowing and carding process per unit time is balanced with the cotton requirement of the multi-chamber blending machine.

[0009] Further improvement of the above technical solution: when the spinning variety is changed, the material in the blending chamber needs to be emptied, and then the blending chamber emptying cotton supply method is started: the multi-chamber blending machine does not require cotton from the previous equipment, and only supplies cotton to the subsequent equipment. The cotton requirement of the carding machine is calculated according to the number of operating cards and the output per card. The cotton storage in the blending chamber is calculated according to the pressure in the blending chamber, and the cotton supply of the multi-chamber blending machine is equal to the cotton requirement of the carding machine. The average linear speed V1.0 required for the flat apron to run during emptying is calculated. The required frequency of the frequency converter is calculated through the flat apron linear speed V1.1 during emptying. Flat apron linear speed V1, unit: m / min V1= K × f1 In the formula: f1 - power supply frequency of the flat apron variable frequency motor, unit: Hz K - constant Inclined apron linear speed V2, unit: m / min V2= K × f2 In the formula: f2—the power supply frequency of the inclined curtain inverter motor, unit: Hz K—constant The speed of the flat cord during the emptying of the cotton blending bin is V1.1; The average linear velocity V1.0 required for the flat curtain to run during emptying; The speed of the flat cord during the emptying process in the cotton blending bin increases by a percentage (P%). V1.1 = V1.0 × P% The speed of the flat cord V1.1 during the emptying process in the cotton blending bin follows the time change rate R1, and is set based on experience. With a thicker cotton layer, the running time is constant; an empirical value K1 is set. The emptying operation time XT1 of the cotton blending bin is variable and is accumulated during the emptying operation; P% = R1 × {1 + (XT1 - K1) / ((Cotton storage capacity × 60) / (Cardboard machine output × Number of units))}.

[0010] Further improvements to the above technical solution: The operational efficiency control method includes the following steps: S1: After the multi-compartment cotton blending machine is started, set the target efficiency η of the inclined curtain on the human-machine interface, in terms of %; and the maximum operating efficiency η of the inclined curtain. 大 The unit is %; the minimum operating efficiency η of the inclined curtain. 小 The unit is %; the actual operating efficiency η of the inclined curtain. 斜帘， Actual operating efficiency η of the flat curtain 平帘 The unit is %; the automatic adjustment time t1 is in minutes; the efficiency calculation time t2 is in minutes; and the minimum operating efficiency η of the inclined curtain is... 小 <Target efficiency η of inclined curtain <Maximum operating efficiency η of inclined curtain 大 ; S2: Calculate the running time of the inclined curtain and the flat curtain. When the start-up time reaches the set efficiency calculation time t2, the CPU programmable controller calculates the actual operating efficiency η of the inclined curtain. 斜帘 The actual operating efficiency η of the peace curtain 平帘 And compare it with the value of the target efficiency η of the inclined curtain, when the set automatic adjustment time t1 is also reached: If the actual operating efficiency of the inclined curtain is η 斜帘 Minimum operating efficiency η of inclined curtain 小 The new inclined / horizontal curtain speed = inclined / horizontal curtain speed - adjustment range Δ. The inclined curtain stopping time is shortened, and the actual operating efficiency η of the inclined curtain after adjustment is increased. 斜帘 improve; If the actual operating efficiency of the inclined curtain is η 斜帘 Maximum operating efficiency η of the inclined curtain 大Then the new inclined screen / flat screen speed = inclined screen / flat screen speed + adjustment range Δ, the inclined screen stop time is increased, and the actual operation efficiency η of the adjusted inclined screen 斜帘 is reduced; If the actual operation efficiency η of the inclined screen 小 is less than the minimum operation efficiency η of the inclined screen 斜帘 , then the inclined screen / flat screen speed is reduced by the adjustment range Δ, the actual operation efficiency η of the inclined screen is increased, and the actual operation efficiency η of the flat screen is reduced 大 . S3: If, in the S2, after the adjustment of the inclined screen / flat screen speed once, the actual operation efficiency η of the inclined screen 斜帘 is still less than the minimum operation efficiency η of the inclined screen 小 , then the adjustment of the inclined screen / flat screen speed is performed again until the actual operation efficiency η of the inclined screen 斜帘 satisfies the following condition: that is, η 小 < η 斜帘 < η 大 , and the adjustment is stopped. If, in the S2, after the adjustment of the inclined screen / flat screen speed once, the actual operation efficiency η of the inclined screen 斜帘 is still greater than the maximum operation efficiency η of the inclined screen 大 , then the adjustment of the inclined screen / flat screen speed is performed again until the actual operation efficiency η of the inclined screen 斜帘 satisfies the following condition: that is, η 小 > η 斜帘 > η 大 , and the adjustment is stopped.

[0011] Further improvement of the above technical solution: the flat screen tracks the operation of the inclined screen with a set proportional coefficient, the proportional coefficient is automatically adjusted according to the ratio of the actual operation efficiency η of the flat screen 平帘 to the actual operation efficiency η of the inclined screen 斜帘 , the actual operation efficiency η of the flat screen 平帘 is lower than the actual operation efficiency η of the inclined screen 斜帘 , and the control range of the difference between the two is within 3%.

[0012] Compared with the prior art, the present application has the following advantages and positive effects: 1. The present application realizes self-adaptive prediction control, and does not need manual intervention throughout the whole process. The cotton supply of the blowing-carding flow is automatically adjusted, the cotton supply speed and efficiency of the multi-bin cotton mixer are automatically adjusted, and the start-stop times of the inclined screen and the flat screen are reduced. 2. The present application optimizes control precision, and realizes more uniform conveying of raw materials, dynamic balance between the cotton supply of the multi-bin cotton mixer and the cotton demand of the carding machine, and improvement of production efficiency and product quality. 3. The present application reduces the requirements for the technical quality and quantity of the car stopper, and reduces labor cost. DRAWINGS

[0013] Figure 1 The flow diagram for the application of the application to the carding and combing process; Figure 2 The structure diagram of the multi-bin cotton mixer applied to the application; Figure 3 The electrical control diagram of the multi-bin cotton mixer applied to the application; Figure 4 The principle block diagram of the control system of the multi-bin cotton mixer operation efficiency adjustment method applied to the application; Figure 5 The principle block diagram of the control system of the multi-bin cotton mixer cotton supply control system applied to the application.

[0014] In the figure: 1, the cotton grabber; 2, the cotton conveying fan; 3, the fire prevention device; 4, the heavy object separator; 5, the axial flow opener; 6, the multi-bin cotton mixer; 6.1, the input pipeline; 6.2, the material conveying chute; 6.3, the flat curtain; 6.4, the inclined curtain; 6.5, the cotton mixing bin; 6.6, the stripping beater; 6.7, the heavy and impurity separator; 6.8, the output pipeline; 7, the scutcher; 8, the dust remover; 9, the carding machine; 10, the distributor. DETAILED DESCRIPTION

[0015] The application will be further described in detail below with reference to the accompanying drawings.

[0016] Reference Figures 1-5 , the embodiment of the multi-bin cotton mixer cotton supply control system applied to the application, comprising a cotton grabber 1, a cotton conveying fan 2, a fire prevention device 3, a heavy object separator 4, an axial flow opener 5, a multi-bin cotton mixer 6, a scutcher 7, a dust remover 8, a carding machine 9, a distributor 10 and a control system, the multi-bin cotton mixer comprising an input pipeline 6.1, a material conveying chute 6.2, an inclined curtain 6.4, a flat curtain 6.3, a cotton mixing bin 6.5, a stripping beater 6.6, a heavy and impurity separator 6.7 and an output pipeline 6.8, the control system being connected with the controllers of the cotton grabber 1, the axial flow opener 5, the multi-bin cotton mixer 6, the scutcher 7 and the carding machine 9. The pressure sensor arranged in the bin of the multi-bin cotton mixer 6 and the cotton position photoelectric sensor arranged in the scutcher cotton storage box, the control ends of the inclined curtain variable frequency motor and the flat curtain variable frequency motor are all connected with the control system. The control system comprises a man-machine interface and a CPU programmable controller, the man-machine interface is connected with the CPU programmable controller, and the CPU programmable controller comprises a backward stage cotton supply amount calculation control module, a forward stage cotton demand amount calculation control module, an operation efficiency calculation adjustment module and a variable frequency motor control module.

[0017] The above-mentioned pressure sensor is specifically arranged at the upper part of the bin of the multi-bin cotton mixer 6 and above the material conveying chute 6.2.

[0018] The above-mentioned man-machine interface is used for inputting the process parameters of the equipment and receiving the signals of the equipment, and the process parameters comprise the set target efficiency.

[0019] The backward stage cotton supply amount calculation control module is used for reading the number of running carding machines 9 and the output of each carding machine and calculating the cotton supply demand, calculating the cotton conveying speed of the flat lap machine 6.3 according to the cotton supply demand and the cotton storage amount in the blending bin 6.5, and adjusting and controlling the running speed and start-stop of the inclined lap machine variable frequency motor and the flat lap machine variable frequency motor through the variable frequency motor control module, and stably supplying cotton to the backward stage equipment through the inclined lap machine 6.4.

[0020] The forward stage cotton demand calculation control module is used for calculating the cotton demand of the forward stage equipment according to the cotton storage amount in the blending bin 6.5, and controlling and adjusting the raw material output of the forward stage equipment to be consistent with the cotton demand of the forward stage equipment.

[0021] The running efficiency calculation and adjustment module is used for detecting the actual running efficiency of the inclined lap machine 6.4 and the flat lap machine 6.3, comparing and calculating with the set target efficiency, and adjusting and controlling the running speed and start-stop of the inclined lap machine variable frequency motor and the flat lap machine variable frequency motor through the variable frequency motor control module, so that the actual running efficiency is consistent with the set target efficiency. The variable frequency motor control module is used for automatically controlling and adjusting the rotating speed and start-stop of the inclined lap machine variable frequency motor and the flat lap machine variable frequency motor according to the instructions sent by the CPU programmable controller.

[0022] Referring to Figures 1-5 , the embodiment of the control method of the cotton supply control system of the multi-bin blending cotton machine, the control method includes a cotton supply amount control method and a running efficiency control method, the cotton supply amount control method includes a normal cotton supply method of a blending bin and an empty cotton supply method of a blending bin, and the normal cotton supply method of the blending bin includes the following steps: Step 1: when starting normal operation, first calculate the appropriate cotton supply demand according to the number of running carding machines 9 and the output of each carding machine in the backward stage; Step 2: calculate the cotton conveying speed of the flat lap machine 6.3 according to the cotton supply demand and the cotton storage amount in the blending bin 6.5, adjust and control the running speed and start-stop of the inclined lap machine variable frequency motor and the flat lap machine variable frequency motor, run at the calculated cotton conveying speed of the flat lap machine 6.3, and stably supply cotton to the backward stage equipment through the inclined lap machine 6.4; Step 3: judge the amount of cotton in the cotton storage box of the scutcher 7 according to the shielding condition of the photoelectric sensor in the cotton storage box, adjust and control the running speed and start-stop of the inclined lap machine variable frequency motor and the flat lap machine variable frequency motor, and realize slow cotton supply, fast cotton supply or stop cotton supply; Step 4: According to the pressure in the blending warehouse 6.5 and the full warehouse pressure of the blending warehouse, the cotton storage amount in the blending warehouse 6.5 is calculated, and the amount of cotton required by the forward positioned picking machine 1 is adjusted. When the cotton storage amount in the blending warehouse 6.5 is low, the forward positioned picking machine 1 is controlled to increase the amount of cotton supplied to the blending warehouse 6.5; when the cotton storage amount in the blending warehouse 6.5 is high, the forward positioned picking machine 1 is controlled to reduce the amount of cotton supplied to the blending warehouse 6.5; when the pressure in the blending warehouse 6.5 reaches the upper limit, the cotton required by the forward positioned picking machine 1 is stopped.

[0023] Further, the calculation method of the cotton supply amount of the multi-warehouse blending machine 6 and the cotton required amount of the carding machine 9 is as follows: Unit time required cotton amount = carding machine 9 running number × yield per unit × (1 + impurity rate %); Unit time cotton supply amount = current blending warehouse 6.5 cotton storage amount × flat apron line speed / blending warehouse length; Blending warehouse cotton storage amount = blending warehouse full 6.5 cotton storage amount × (current blending warehouse 6.5 pressure / blending warehouse 6.5 full pressure + compensation coefficient); The required flat apron line speed V1 is calculated from "unit time cotton supply amount = unit time required cotton amount", and the flat apron variable frequency motor supply frequency f1 is calculated according to the required flat apron line speed V1 and the speed reduction ratio of the flat apron variable frequency motor; the oblique apron variable frequency motor supply frequency f2 = flat apron variable frequency motor supply frequency f1 / percentage of flat apron tracking oblique apron frequency.

[0024] Further, in step 4, the blending warehouse 6.5 cotton storage amount and the forward supply cotton amount proportional relationship is as follows: (1) Blending warehouse cotton storage amount: 91%-100%, forward supply cotton amount: 70%; (2) Blending warehouse cotton storage amount: 86%-190%, forward supply cotton amount: 80%; (3) Blending warehouse cotton storage amount: 81%-85%, forward supply cotton amount: 90%; (4) Blending warehouse cotton storage amount: 76%-80%, forward supply cotton amount: 100%; (5) Blending warehouse cotton storage amount: 71%-75%, forward supply cotton amount: 110%; (6) Blending warehouse cotton storage amount: 0%-70%, forward supply cotton amount: 120%; The forward supply cotton amount 100% is the value when the forward supply cotton amount in the unit time of the carding unit process and the cotton required amount of the multi-warehouse blending machine 6 are balanced in the theoretical calculation.

[0025] The cotton supply method of the blending warehouse of the application is as follows: When the spinning variety is changed, the material in the blending bin 6.5 needs to be emptied, and the cotton supplying method for emptying the blending bin is started: the multi-bin blending machine 6 does not ask for cotton from the previous stage, and only supplies cotton to the next stage. First, the cotton requirement of the carding machine 9 is calculated according to the number of carding machines 9 started and the output of the carding machines; the cotton storage amount in the blending bin 6.5 is calculated according to the pressure in the blending bin 6.5, and the emptying time when the cotton supply amount of the multi-bin blending machine 6 is equal to the cotton requirement of the carding machine 9 is calculated, and the average linear speed V1.0 required for the running of the flat apron 6.3 at the time of emptying is calculated; the frequency of the frequency converter required is calculated through the running linear speed V1.1 of the flat apron; The flat apron linear speed V1, unit: m / min V1= K × f1 In the formula: f1—flat apron frequency converter supply frequency, unit: Hz K—constant The inclined apron linear speed V2, unit: m / min V2= K × f2 In the formula: f2—inclined apron frequency converter supply frequency, unit: Hz K—constant The flat apron linear speed V1.1 when the blending bin 6.5 is emptied; The average linear speed V1.0 required for the running of the flat apron at the time of emptying; The increase percentage P% of the flat apron linear speed V1.1 when the blending bin is emptied; V1.1= V1.0 × P%; The time change rate R1 of the flat apron linear speed V1.1 when the blending bin is emptied, which is set according to experience; The cotton layer is relatively thick, and the running time is a constant, and an empirical value K1 is set; The blending bin 6.5 emptying running time XT1 is variable and accumulates during the emptying running process; P%=R1 × {(XT1- K1) / ((cotton storage amount × 60) / (carding machine output × number of carding machines))}.

[0026] The cotton supplying method for emptying the blending bin 6.5 is illustrated as follows: If the pressure in the full blending bin 6.5 is 500 Pa, the cotton storage amount in the blending bin 6.5 is 1000 kg, and the blending bin 6.5 is started to be emptied when the pressure in the blending bin 6.5 is 400 Pa, and the compensation coefficient is 5%; The cotton storage amount in the blending bin 6.5=1000 kg × (400 / 500+5%)=850 kg; The cotton requirement per hour=20 × 80 kg / hour × (1+6.25%)=1700 kg; Then the emptying time is 30 minutes; Empty time 30 minutes for cotton 850kg, then the average linear speed of flat apron V1.0 = 6m / 30min = 0.2m / min; The flat apron speed following time rate R1 is set to 1.5 and K1 is set to 10 when the blending bin is empty; P% = R1 x {1 + (XT1 - K1) / ((cotton amount x 60) / (card output x card number))} = 1.5 x {1 + (XT1 - 10) / ((850 x 60) / (80 x 20))}; Assuming that the emptying running time has reached XT1 = 5min: Then P% = 1.5 x {1 + (5 - 10) / ((850 x 60) / (80 x 20))} = 1.5 x {1 + (-0.15686)} ≈ 126.47%; The flat apron speed V1.1 when the blending bin is empty 1.1 = 0.2m / min x 126.47% ≈ 0.25294m / min; Assuming that the emptying running time has reached XT1 = 10min: Then P% = 1.5 x {1 + (10 - 10) / ((850 x 60) / (80 x 20))} = 1.5 x {1 + 0} = 150%; The flat apron speed V1.1 when the blending bin is empty = 0.2m / min x 150% = 0.3m / min; Assuming that the emptying running time has reached XT1 = 20min: Then P% = 1.5 x {1 + (20 - 10) / ((850 x 60) / (80 x 20))} = 1.5 x {1 + 10 / 31.875} ≈ 197.06%; The flat apron speed V1.1 when the blending bin is empty = 0.2m / min x 197.06% ≈ 0.3941m / min; Assuming that the emptying running time has reached XT1 = 30min: Then P% = 1.5 x {1 + (30 - 10) / ((850 x 60) / (80 x 20))} = 1.5 x {1 + 20 / 31.875} ≈ 244.12%; The flat apron speed V1.1 when the blending bin is empty = 0.2m / min x 244.12% ≈ 0.48824m / min.

[0027] Further, the running efficiency control method of the application comprises the following steps: S1: After the multi-bin blending machine 6 is started to run, the target efficiency η of the inclined apron is set on the man-machine interface, which is in %; the maximum running efficiency η 大 of the inclined apron is in %; and the minimum running efficiency η of the inclined apron is in %.小 Actual running efficiency of the inclined curtain, unit: %; Actual running efficiency of the horizontal curtain, unit: % 斜帘， Actual running efficiency of the horizontal curtain, unit: % 平帘 Automatic adjustment time t1, unit: minute; Efficiency calculation time t2, unit: minute; Minimum running efficiency of the inclined curtain, unit: % 小 Maximum running efficiency of the inclined curtain, unit: % 大 ; S2: Calculate the running time of the inclined curtain 6.4 and the horizontal curtain 6.3, and when the driving time reaches the set efficiency calculation time t2, the CPU programmable controller calculates the actual running efficiency of the inclined curtain 斜帘 and the actual running efficiency of the horizontal curtain 平帘 , and compares the value with the target efficiency of the inclined curtain η If the actual running efficiency of the inclined curtain η 斜帘 is less than the minimum running efficiency of the inclined curtain η 小 , then the new inclined / horizontal curtain speed = inclined / horizontal curtain speed - adjustment amplitude Δ, the inclined curtain stop time is shortened, and the adjusted actual running efficiency of the inclined curtain η 斜帘 is increased; If the actual running efficiency of the inclined curtain η 斜帘 is greater than the maximum running efficiency of the inclined curtain η 大 , then the new inclined / horizontal curtain speed = inclined / horizontal curtain speed + adjustment amplitude Δ, the inclined curtain stop time is increased, and the adjusted actual running efficiency of the inclined curtain η 斜帘 is decreased; If the minimum running efficiency of the inclined curtain η 小 is greater than the actual running efficiency of the inclined curtain η 斜帘 , and the maximum running efficiency of the inclined curtain η 大 , then the inclined / horizontal curtain speed remains unchanged; S3: If, in the S2, after one reduction adjustment of the inclined / horizontal curtain speed, the actual running efficiency of the inclined curtain η 斜帘 is still less than the minimum running efficiency of the inclined curtain η 小 , then the reduction adjustment of the inclined / horizontal curtain speed is performed again until the actual running efficiency of the inclined curtain η 斜帘 satisfies the following condition: that is, η 小 < η 斜帘 < η 大 , then the adjustment is stopped; If, in the S2, after one increase adjustment of the inclined / horizontal curtain speed, the actual running efficiency of the inclined curtain η 斜帘 is still greater than the maximum running efficiency of the inclined curtain η 大 , then the increase adjustment of the inclined / horizontal curtain speed is performed again until the actual running efficiency of the inclined curtain η 斜帘 satisfies the following condition: that is, η 小 > η 斜帘 > η大 If so, stop adjusting.

[0028] Further, the flat curtain tracks the inclined curtain operation with a set proportional coefficient, which is automatically adjusted according to the ratio of the actual operation efficiency η 平帘 of the flat curtain to the actual operation efficiency η 斜帘 of the inclined curtain, the actual operation efficiency η 平帘 of the flat curtain being lower than the actual operation efficiency η 斜帘 of the inclined curtain, the control range of the difference being within 3%.

[0029] The operation efficiency control method of the present application is illustrated as follows: Setting: the target efficiency η = 95% of the inclined curtain, the maximum operation efficiency η 大= 99% of the inclined curtain, the minimum operation efficiency η 小= 90% of the inclined curtain, the efficiency calculation time t2 = 10 minutes, the automatic adjustment time t1 = 10 minutes, the adjustment range = Δ2%, the flat curtain speed tracking the inclined curtain proportion = 60%. After the multi-bin cotton mixer 6 operates for 10 minutes, the operation efficiency of the inclined curtain is calculated as 85%, the operation efficiency of the flat curtain is calculated as 83%, and the efficiency adjustment time of 10 minutes is also reached. Thus, the operation speed of the inclined curtain is -2%, and the flat curtain tracking the inclined curtain proportion value remains unchanged. After the multi-bin cotton mixer 6 operates for 10 minutes, the operation efficiency of the inclined curtain is calculated as 100%, the operation efficiency of the flat curtain is calculated as 98%, and the efficiency adjustment time of 10 minutes is also reached. Thus, the operation speed of the inclined curtain is +2%, and the flat curtain tracking the inclined curtain proportion value remains unchanged. After the multi-bin cotton mixer 6 operates for 10 minutes, the operation efficiency of the inclined curtain is calculated as 85%, the operation efficiency of the flat curtain is calculated as 73%, and the efficiency adjustment time of 10 minutes is also reached. Thus, the operation speed of the inclined curtain is -2%, and the flat curtain tracking the inclined curtain proportion value = 60%-2% = 58%. After the multi-bin cotton mixer 6 operates for 10 minutes, the operation efficiency of the inclined curtain is calculated as 100%, the operation efficiency of the flat curtain is calculated as 90%, and the efficiency adjustment time of 10 minutes is also reached. Thus, the operation speed of the inclined curtain is -2%, and the flat curtain tracking the inclined curtain proportion value = 60%+2% = 62%. Of course, the above illustration is not a limitation of the present application, and the present application is not limited to the above examples. Within the essential scope of the present application, changes, modifications, additions or replacements made by ordinary skilled in the art should also fall within the protection scope of the present application.

Claims

1. A cotton supply control system for a multi-compartment cotton blending machine, comprising a cotton grabber, an axial flow cotton opener, a multi-compartment cotton blending machine, a cotton cleaner, a carding machine, and a control system, wherein the multi-compartment cotton blending machine includes an input pipe, a conveying trough, an inclined curtain, a flat curtain, a cotton blending compartment, and an output pipe; the control system is connected to the controllers of the cotton grabber, the axial flow cotton opener, the multi-compartment cotton blending machine, the cotton cleaner, and the carding machine; a pressure sensor installed in the compartment of the multi-compartment cotton blending machine, a cotton level photoelectric sensor installed in the cotton storage box of the cotton cleaner, and the control terminals of the variable frequency motors of the inclined curtain and the flat curtain are all connected to the control system, characterized in that... The control system includes a human-machine interface and a CPU programmable controller. The human-machine interface is connected to the CPU programmable controller. The CPU programmable controller includes a cotton supply calculation and control module for downstream stages, a cotton demand calculation and control module for upstream stages, an operating efficiency calculation and adjustment module, and a variable frequency motor control module. The human-machine interface is used to input the process parameters of the equipment and receive signals from the equipment. The process parameters include setting the target efficiency. The cotton supply calculation and control module for the downstream stage is used to read the number of carding machines started and the output of a single machine and calculate the cotton supply demand. It uses the cotton supply demand and the amount of cotton stored in the blending silo to calculate the cotton feeding speed of the flat curtain. It also adjusts and controls the running speed and start / stop of the inclined curtain variable frequency motor and the flat curtain variable frequency motor through the variable frequency motor control module, and stably supplies cotton to the downstream equipment through the inclined curtain. The forward cotton demand calculation and control module is used to calculate the amount of cotton required by the forward equipment based on the amount of cotton stored in the cotton blending bin, and to control and adjust the raw material output of the forward equipment to be consistent with the amount of cotton required by the forward equipment. The operating efficiency calculation and adjustment module is used to detect the actual operating efficiency of the inclined curtain and the flat curtain, compare and calculate it with the set target efficiency, and adjust and control the operating speed and start / stop of the variable frequency motor of the inclined curtain and the variable frequency motor of the flat curtain through the variable frequency motor control module, so that the actual operating efficiency is consistent with the set target efficiency. The variable frequency motor control module is used to automatically control and adjust the speed and start / stop of the inclined curtain variable frequency motor and the flat curtain variable frequency motor according to the instructions issued by the CPU programmable controller.

2. A control method for a cotton supply control system for a multi-compartment cotton blender as described in claim 1, characterized in that, The control method includes a cotton supply control method and an operational efficiency control method. The cotton supply control method includes a normal cotton supply method for the mixed cotton silo and a cotton supply method for emptying the mixed cotton silo. The normal cotton supply method for the mixed cotton silo includes the following steps: Step 1: When starting normal operation, first calculate the appropriate cotton supply demand based on the number of carding machines started and the output of each machine. Step 2: Calculate the cotton feeding speed of the flat curtain using the cotton supply demand and the amount of cotton stored in the blending silo; Adjust and control the running speed and start / stop of the inclined curtain variable frequency motor and the flat curtain variable frequency motor, run according to the calculated cotton feeding speed of the flat curtain, and stably supply cotton to the downstream equipment through the inclined curtain; Step 3: Determine the amount of cotton in the cotton storage box of the cotton cleaner based on the obstruction status of the photoelectric sensor in the cotton storage box, and adjust and control the running speed and start / stop of the inclined curtain variable frequency motor and the flat curtain variable frequency motor to achieve slow cotton supply, fast cotton supply or stop cotton supply. Step 4: Calculate the amount of cotton stored in the cotton blending silo based on the pressure inside the silo and the pressure when the silo is full. Adjust the amount of cotton demanded from the forward-mounted cotton grabber. When the amount of cotton stored in the silo is low, control the cotton grabber to increase the amount of cotton supplied to the front of the silo. When the amount of cotton stored in the silo is high, control the cotton grabber to decrease the amount of cotton supplied to the front of the silo. When the pressure inside the silo reaches the upper limit, stop demanding cotton from the cotton grabber.

3. The control method of the cotton supply control system for the multi-compartment cotton blender according to claim 2, characterized in that, The calculation methods for the cotton supply of the multi-compartment blending machine and the cotton demand of the carding machine are as follows: Cotton requirement per unit time = Number of carding machines running × Output per machine × (1 + Impurity rate %) Cotton supply per unit time = Current cotton storage quantity in the blended cotton warehouse × Flat cord speed / Length of the blended cotton warehouse; Cotton storage capacity in blended cotton warehouse = Cotton storage capacity at full capacity in blended cotton warehouse × (Current pressure in blended cotton warehouse / Pressure when blended cotton warehouse is full + Compensation coefficient); The required flat curtain linear speed V1 is calculated from "cotton supply per unit time = cotton demand per unit time". The power supply frequency f1 of the flat curtain variable frequency motor is calculated based on the required flat curtain linear speed V1 and the reduction ratio of the flat curtain variable frequency motor. The power supply frequency f2 of the inclined curtain variable frequency motor is equal to the power supply frequency f1 of the flat curtain variable frequency motor / the percentage of the flat curtain tracking the inclined curtain frequency.

4. The control method of the cotton supply control system for a multi-compartment cotton blender according to claim 2 or 3, characterized in that, In step 4, the ratio of cotton storage quantity in the mixed cotton warehouse to cotton supply quantity in the preceding stage is as follows: (1) Cotton storage quantity in blended cotton warehouses: 91%-100%, cotton supply quantity to upstream suppliers: 70%; (2) Cotton storage quantity in blended cotton warehouses: 86%-90%, cotton supply quantity to upstream suppliers: 80%; (3) Cotton storage quantity in blended cotton warehouses: 81%-85%, cotton supply quantity to upstream suppliers: 90%; (4) Cotton storage quantity in blended cotton warehouses: 76%-80%, cotton supply quantity to upstream suppliers: 100%; (5) Cotton storage quantity in blended cotton warehouses: 71%-75%, cotton supply quantity to upstream suppliers: 110%; (6) Cotton storage quantity in blended cotton warehouses: 0%-70%, cotton supply quantity to upstream suppliers: 120%; The 100% pre-stage cotton supply is the theoretically calculated value when the pre-stage cotton supply and the cotton demand of the multi-bin blender are balanced within a unit time in the combing and cleaning process.

5. The control method of the cotton supply control system for a multi-compartment cotton blender according to claim 2 or 3, characterized in that, When changing yarn types, the material in the blending silo needs to be emptied. The following method for emptying and supplying cotton to the blending silo is then employed: the multi-silo blending machine does not request cotton from upstream equipment; it only supplies cotton to downstream equipment. First, calculate the cotton requirement for the carding machine based on the number of carding machines in operation and their output. Then, calculate the cotton storage capacity in the blending silo based on the pressure inside the silo and the emptying time when the cotton supply from the multi-silo blending machine equals the cotton requirement of the carding machine. Calculate the average linear speed V1.0 required for the flat curtain to operate during emptying. Finally, calculate the required inverter frequency based on the flat curtain linear speed V1.1 during emptying of the blending silo. Linear speed of flat cord V1, unit: m / min V1 = K × f1 In the formula: f1—power supply frequency of the flat curtain inverter motor, unit: Hz K—constant Inclined curtain linear velocity V2, unit: m / min V2 = K × f2 In the formula: f2—the power supply frequency of the inclined curtain inverter motor, unit: Hz K—constant The speed of the flat cord during the emptying of the cotton blending bin is V1.1; The average linear velocity V1.0 required for the flat curtain to run during emptying; The speed of the flat cord during the emptying process in the cotton blending bin increases by a percentage (P%). V1.1 = V1.0 × P% The speed of the flat cord V1.1 during the emptying process in the cotton blending bin follows the time change rate R1, and is set based on experience. With a thicker cotton layer, the running time is constant; an empirical value K1 is set. The emptying operation time XT1 of the cotton blending bin is variable and is accumulated during the emptying operation; P% = R1 × {1 + (XT1 - K1) / ((Cotton storage capacity × 60) / (Cardboard machine output × Number of units))}.

6. The control method of the cotton supply control system for the multi-compartment cotton blender according to claim 4, characterized in that, When changing yarn types, the material in the blending silo needs to be emptied. The following method for emptying and supplying cotton to the blending silo is then employed: the multi-silo blending machine does not request cotton from upstream equipment; it only supplies cotton to downstream equipment. First, calculate the cotton requirement for the carding machine based on the number of carding machines in operation and their output. Then, calculate the cotton storage capacity in the blending silo based on the pressure inside the silo and the emptying time when the cotton supply from the multi-silo blending machine equals the cotton requirement of the carding machine. Calculate the average linear speed V1.0 required for the flat curtain to operate during emptying. Finally, calculate the required inverter frequency based on the flat curtain linear speed V1.1 during emptying of the blending silo. Linear speed of flat cord V1, unit: m / min V1 = K × f1 In the formula: f1—power supply frequency of the flat curtain inverter motor, unit: Hz K—constant Inclined curtain linear velocity V2, unit: m / min V2 = K × f2 In the formula: f2—the power supply frequency of the inclined curtain inverter motor, unit: Hz K—constant The speed of the flat cord during the emptying of the cotton blending bin is V1.1; The average linear velocity V1.0 required for the flat curtain to run during emptying; The speed of the flat cord during the emptying process in the cotton blending bin increases by a percentage (P%). V1.1 = V1.0 × P% The speed of the flat cord V1.1 during the emptying process in the cotton blending bin follows the time change rate R1, and is set based on experience. With a thicker cotton layer, the running time is constant; an empirical value K1 is set. The emptying operation time XT1 of the cotton blending bin is variable and is accumulated during the emptying operation; P% = R1 × {1 + (XT1 - K1) / ((Cotton storage capacity × 60) / (Cardboard machine output × Number of units))}.

7. The control method of the cotton supply control system for a multi-compartment cotton blender according to claim 2 or 3, characterized in that, The operational efficiency control method includes the following steps: S1: After the multi-compartment cotton blending machine is started, set the target efficiency η of the inclined curtain on the human-machine interface, in terms of %; and the maximum operating efficiency η of the inclined curtain. 大 The unit is % Minimum operating efficiency η of inclined curtain 小 The unit is % Actual operating efficiency η of inclined curtain 斜帘， Actual operating efficiency η of the flat curtain 平帘 The unit is % Automatically adjust time t1, in minutes; Efficiency calculation time t2, in minutes; Minimum operating efficiency η of inclined curtain 小 <Target efficiency η of inclined curtain <Maximum operating efficiency η of inclined curtain 大 ; S2: Calculate the running time of the inclined curtain and the flat curtain. When the start-up time reaches the set efficiency calculation time t2, the CPU programmable controller calculates the actual operating efficiency η of the inclined curtain. 斜帘 The actual operating efficiency η of the peace curtain 平帘 And compare it with the value of the target efficiency η of the inclined curtain, when the set automatic adjustment time t1 is also reached: If the actual operating efficiency of the inclined curtain is η 斜帘 Minimum operating efficiency η of inclined curtain 小 The new inclined / horizontal curtain speed = inclined / horizontal curtain speed - adjustment range Δ. The inclined curtain stopping time is shortened, and the actual operating efficiency η of the inclined curtain after adjustment is increased. 斜帘 improve; If the actual operating efficiency of the inclined curtain is η 斜帘 Maximum operating efficiency η of the inclined curtain 大 The new inclined / horizontal curtain speed = inclined / horizontal curtain speed + adjustment range Δ. The inclined curtain stopping time increases, and the actual operating efficiency η of the inclined curtain after adjustment... 斜帘 reduce; If the minimum operating efficiency η of the inclined curtain 小 Actual operating efficiency η of the inclined curtain 斜帘 Maximum operating efficiency η of the inclined curtain 大 Then the speed of the inclined / horizontal curtain remains unchanged; S3: If, in S2, after one adjustment to reduce the speed of the inclined / flat curtain, the actual operating efficiency η of the inclined curtain... 斜帘 Still less than the minimum operating efficiency η of the inclined curtain 小 Then, the speed of the inclined / horizontal curtain is reduced again until the actual operating efficiency η of the inclined curtain is reached. 斜帘 The following condition must be met: i.e., η 小 <η 斜帘 <η 大 If so, then stop adjusting; If, in S2, after one adjustment to increase the speed of the inclined / horizontal curtain, the actual operating efficiency η of the inclined curtain... 斜帘 Still greater than the maximum operating efficiency η of the inclined curtain 大 Then, the speed of the inclined / horizontal curtain is adjusted again until the actual operating efficiency η of the inclined curtain is reached. 斜帘 The following condition must be met: i.e., η 小 <η 斜帘 <η 大 If so, then stop adjusting.

8. The control method of the cotton supply control system for the multi-compartment cotton blender according to claim 6, characterized in that, The operational efficiency control method includes the following steps: S1: After the multi-compartment cotton blending machine is started, set the target efficiency η of the inclined curtain on the human-machine interface, in terms of %; and the maximum operating efficiency η of the inclined curtain. 大 The unit is % Minimum operating efficiency η of inclined curtain 小 The unit is % Actual operating efficiency η of inclined curtain 斜帘， Actual operating efficiency η of the flat curtain 平帘 The unit is % Automatically adjust time t1, in minutes; Efficiency calculation time t2, in minutes; Minimum operating efficiency η of inclined curtain 小 <Target efficiency η of inclined curtain <Maximum operating efficiency η of inclined curtain 大 ; S2: Calculate the running time of the inclined curtain and the flat curtain. When the start-up time reaches the set efficiency calculation time t2, the CPU programmable controller calculates the actual operating efficiency η of the inclined curtain. 斜帘 The actual operating efficiency η of the peace curtain 平帘 And compare it with the value of the target efficiency η of the inclined curtain, when the set automatic adjustment time t1 is also reached: If the actual operating efficiency of the inclined curtain is η 斜帘 Minimum operating efficiency η of inclined curtain 小 The new inclined / horizontal curtain speed = inclined / horizontal curtain speed - adjustment range Δ. The inclined curtain stopping time is shortened, and the actual operating efficiency η of the inclined curtain after adjustment is increased. 斜帘 improve; If the actual operating efficiency of the inclined curtain is η 斜帘 Maximum operating efficiency η of the inclined curtain 大 The new inclined / horizontal curtain speed = inclined / horizontal curtain speed + adjustment range Δ. The inclined curtain stopping time increases, and the actual operating efficiency η of the inclined curtain after adjustment... 斜帘 reduce; If the minimum operating efficiency η of the inclined curtain 小 Actual operating efficiency η of the inclined curtain 斜帘 Maximum operating efficiency η of the inclined curtain 大 Then the speed of the inclined / horizontal curtain remains unchanged; S3: If, in S2, after one adjustment to reduce the speed of the inclined / flat curtain, the actual operating efficiency η of the inclined curtain... 斜帘 Still less than the minimum operating efficiency η of the inclined curtain 小 Then, the speed of the inclined / horizontal curtain is reduced again until the actual operating efficiency η of the inclined curtain is reached. 斜帘 The following condition must be met: i.e., η 小 <η 斜帘 <η 大 If so, then stop adjusting; If, in S2, after one adjustment to increase the speed of the inclined / horizontal curtain, the actual operating efficiency η of the inclined curtain... 斜帘 Still greater than the maximum operating efficiency η of the inclined curtain 大 Then, the speed of the inclined / horizontal curtain is adjusted again until the actual operating efficiency η of the inclined curtain is reached. 斜帘 The following condition must be met: i.e., η 小 <η 斜帘 <η 大 If so, then stop adjusting.

9. The control method of the cotton supply control system for the multi-bin cotton blender according to claim 7, characterized in that, The flat curtain tracks the inclined curtain's operation using a set proportional coefficient, which is based on the flat curtain's actual operating efficiency η. 平帘 Actual operating efficiency η of the inclined curtain 斜帘 The ratio is automatically adjusted, and the actual operating efficiency η of the flat curtain is [not specified]. 平帘 The actual operating efficiency η of the inclined curtain is lower than 斜帘 The difference between the two is controlled within 3%.

10. The control method of the cotton supply control system for a multi-compartment cotton blender according to claim 8, characterized in that, The flat curtain tracks the inclined curtain's operation using a set proportional coefficient, which is based on the flat curtain's actual operating efficiency η. 平帘 Actual operating efficiency η of the inclined curtain 斜帘 The ratio is automatically adjusted, and the actual operating efficiency η of the flat curtain is [not specified]. 平帘 The actual operating efficiency η of the inclined curtain is lower than 斜帘 The difference between the two is controlled within 3%.

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