A sintering material layer control method based on wind pressure balance

Abstract

The present invention discloses a sintering material layer control method based on wind pressure balance. The method comprises the following steps: calculating a primary setting value VF of the air door opening according to the target unit output of the sintering machine; set1 ; According to the secondary setting value VF of the air door opening set2 , calculate the bellows damper error VF err ; According to the bellows damper error VF err , calculate the material layer thickness setting value H set ; Calculate the material layer thickness error H according to the deviation between the set thickness value and the thickness detection value err ; According to the material layer thickness error H err , calculate the fine-tuning gate setting value VL set ; The material layer thickness signal obtained by detection is sent to the fine-tuning gate controller; According to the deviation between the standard value of the bellows pressure and the detected value of the bellows pressure, the bellows pressure error PF is calculated err ; According to the bellows pressure error PF err , calculate the secondary setting value VF of the air door opening set2 ; The detected bellows pressure value is sent to each bellows controller; The secondary setting value of the damper opening VF set2 The method can effectively reduce the physical state of the raw materials, effectively reduce adverse effects, and improve the quality of sintered ore products.

Description

Technical field:

[0001] The invention relates to a sintering material layer control method based on wind pressure balance. Background technology:

[0002] Iron ore sintering is an important link in the modern iron and steel metallurgical process. Its main production link is to ignite and burn the evenly mixed small granular raw materials on the trolley sintering machine to fuse them into agglomerated sintered ore. In order to ensure the strength and chemical composition of the sintered ore agglomerates, the raw materials need to be fully burned on the sintering machine. The evenly mixed small granular raw materials fall from the small ore bin at the head of the machine to the sintering machine trolley through the distribution device, and then are evenly distributed in the form of a thick strip layer. In order to ensure the full combustion of the raw materials, the sintering machine will set a wind box under the raw material layer and connect the sintering main exhaust fan. The negative pressure generated by the main exhaust fan brings fresh air into the burning raw material layer. The full contact between fresh air and raw materials is one of the key factors for the efficient production of the sintering machine. When the material layer is relatively thin, the air is easier to contact with the raw materials, so the combustion is more complete, but at this time there are fewer materials on the sintering trolley, which will affect the output of the sintering machine. Increasing the thickness of the material on the sintering trolley will increase the output of the sintering machine and improve efficiency, but thicker materials will affect the contact between air and raw materials, causing product quality problems such as incomplete combustion. In order to find a balance between sufficient combustion and increased output, it is necessary to accurately control the distribution of the sintering machine.

[0003] The sintering material distribution system refers to a series of production equipment from the small ore trough of the sintering machine head to the sintering machine feed port. These equipment generally use variable frequency speed control, and the speed is linked with the sintering machine to ensure material balance. There is a gate at the sintering machine feed port to level the mixed sintering raw materials and control the material layer thickness. Its main equipment includes the main adjustment gate and the fine adjustment gate. The main adjustment gate makes a rough adjustment to the sintering feed amount and generally does not have an online real-time adjustment function, while the precise adjustment of the sintering material layer is mainly achieved by the fine adjustment gate. The fine adjustment gate is driven by a group of electric or hydraulic actuators, which can accurately adjust the valve opening according to the controller instructions, thereby controlling the material layer height on the sintering trolley.

[0004] In traditional sintering production, the material layer height on the sintering trolley is preset, and the material layer height is detected by a radar level meter. By adjusting the fine-tuning gate, the material layer can reach a fixed calculated height. However, due to fluctuations in raw material properties and mixed granulation effects, the fixed material layer thickness cannot fully adapt to sintering production under various working conditions, resulting in changes in the combustion trend of the sintering machine and fluctuations in the quality of the sintered ore products. Based on the above problems, the present invention proposes the following solution for closed-loop control and online optimization of the sintering material layer.

[0005] At present, the material layer thickness parameters of the sintering process are calculated by the production process management personnel. After obtaining the parameters, they are sent to the material distribution system, which is used as the set value to adjust the valve to ensure that the material layer thickness remains at the calculated value. This method has the following problems:

[0006] 1. Changes in the physical properties of sintering raw materials, such as fluctuations in particle size or viscosity, will have a certain impact on the permeability of the material layer. Using a fixed calculated value as the setting value for the material layer thickness will result in the system being unable to respond in time when the raw material state changes, causing fluctuations in the quality of the sintered ore.

[0007] 2. In the process of mixing and granulating sintering raw materials, the amount of water added and mixing parameters will have a certain impact on the granulation effect. The mixed materials with different particle sizes will have a certain impact on the permeability of the material layer. If a fixed calculated value is used as the setting value of the material layer thickness, the system will not be able to respond in time when the mixing and granulation effect changes, resulting in fluctuations in the quality of the sintered ore.

[0008] 3. Air leakage is a common problem in sintering machine production. With different production conditions and equipment maintenance conditions, sintering machines, bellows, flues and other exhaust system equipment may have air leakage failures of varying degrees. Minor air leakage failures generally require the sintering machine to continue production, but this will cause changes in the effective air volume. If the material layer thickness is not corrected in time at this time, the quality of the sintered ore will fluctuate. Summary of the invention:

[0009] In order to solve the above problems, the present invention proposes a sintering material layer control method based on wind pressure balance, which can realize automatic response to fluctuating working conditions by online adjustment of the material layer thickness of the sintering machine, improve the stability and fault tolerance of sintered ore production, and enhance product quality.

[0010] To achieve the above object, the present invention provides a sintering material layer control method based on wind pressure balance, comprising the following steps:

[0011] Step 1: Calculate the air door opening setting value VF according to the target unit output of the sintering machine set1 , the calculation method is as follows:

[0012]

[0013] Among them, VF set1 =[vf(1) set1 ,vf(2) set1 ,vf(3) set1 ],vf(i) set1 represents the primary setting value of the air door opening of the ith air box, K = [k1, k2, k3] is the empirical coefficient of the 1st to 3rd air boxes, M ais the target unit output of the sintering machine, and M0 is the designed unit output of the sintering machine.

[0014] Step 2: Set the secondary value VF according to the air door opening set2 , calculate the bellows damper error VF err , the calculation method is as follows:

[0015] VF err =VF set1 -VF set2

[0016] Among them, rank(VF err )=1×3.

[0017] Step 3: Based on the bellows damper error VF err , calculate the material layer thickness setting value H set , the calculation method is as follows:

[0018] H set =G0(f(VF err , W))

[0019] Among them, the bellows damper error VF err That is, the error value of the main controller, W = [w1, w2, w3] T is the weight coefficient vector, G0(s) is the main controller transfer function, which can be designed as a specific function expression that meets the performance requirements. A feasible function expression is α0, α1, α2 are controller parameters, which can be obtained by zero-pole configuration or experimental methods. f(X, Y) is the bellows-thickness conversion function, which is used to characterize the correlation between the bellows state and the material layer thickness value. A feasible function expression is f(X, Y) = (X-θ) × Y, where X and Y are both in matrix form, θ is the activation threshold of X, and X×Y represents the cross product operation between matrices. The above is only an embodiment of G0(s) and f(X, Y). Other forms of transfer function are also included in the protection of the present invention.

[0020] Step 4: Calculate the material layer thickness error H according to the deviation between the set thickness value and the thickness detection value. err , the calculation method is as follows:

[0021] H err =H set -H

[0022] Among them, rank(H err )=1×n, n is the number of radar level meters distributed horizontally. Figure 1 In the embodiment shown, n=5.

[0023] Step 5: According to the material layer thickness error H err, calculate the fine-tuning gate setting value VL set , the calculation method is as follows:

[0024] V L set =G1(H err )

[0025] Among them, rank(VL set )=1×n. Material layer thickness error H err That is, the error value of the fine-tuning gate controller, G1(s) is the transfer function group of the fine-tuning gate controller, which can be designed as a specific function expression that meets the performance requirements. Figure 1 Taking the case where n=5 in the embodiment shown as an example, a feasible function expression is:

[0026]

[0027] where α 10 , α 11 , α 12 , α 20 , α 21 , α 22 , α 30 , α 31 , α 32 , α 40 , α 41 , α 42 , α 50 , α 51 , α 52 is a controller parameter group, which can be obtained by zero-pole configuration or experimental method. The above is only one embodiment of G1(s), and other forms of transfer function are also included in the protection of the present invention.

[0028] Step 6: Set the fine-tuning gate value VL set The signal is sent to the fine-tuning gate actuator to adjust the fine-tuning gate to the set opening degree. The mixed material is spread on the sintering trolley through the fine-tuning gate. At the outlet of the fine-tuning gate, the thickness of the material layer on the sintering trolley is detected by the radar level meter. The material layer thickness value detected is recorded as H and sent to the fine-tuning gate controller as the feedback signal of the material thickness control subsystem.

[0029] Step 7: Calculate the bellows pressure error PF based on the deviation between the bellows pressure standard value and the bellows pressure detection value err , the calculation method is as follows:

[0030] PF err =PF s -PF

[0031] Among them, rank(PF err )=rank(PFs )=rank(PF)=1×3.

[0032] Step 8: According to the bellows pressure error PF err , calculate the secondary setting value VF of the air door opening set2 , the calculation method is as follows:

[0033] VF set2 =G2(PF err )

[0034] Among them, rank(VF set2 )=1×3. Bellows pressure error PF err is the bellows controller error value, G2(s) is the bellows controller transfer function group, which can be designed as a specific function expression that meets the performance requirements. Figure 1 Taking the embodiment shown as an example, a feasible function expression is:

[0035]

[0036] where α 10 , α 11 , α 12 , α 13 , α 20 , α 21 , α 22 , α 23 , α 30 , α 31 , α 32 , α 33 is a controller parameter group, which can be obtained by zero-pole configuration or experimental method. The above is only one embodiment of G2(s), and other forms of transfer function are also included in the protection of the present invention.

[0037] Step 9: Set the damper opening to the secondary setting value VF set2 The signal is sent to the damper actuator to adjust the damper to the set opening degree. The main exhaust fan of the sintering machine exhausts the sintering machine bellows through the large flue and the wind box inlet branch pipe. The pressure of each wind box is detected by the pressure sensor, and the signal is transmitted through the pressure transmitter. The detected wind box pressure value is recorded as PF, which is sent to each wind box controller as the feedback signal of the wind box pressure control subsystem.

[0038] Step 10: Ignoring the response time of the damper actuator, it can be approximately assumed that the secondary setting value VF of the damper opening of 1~3# wind boxes is set2 Equal to the actual value of the damper opening. In order to reduce the hysteresis effect in the system, this method uses the damper opening secondary setting value VF set2 The actual value of the air door opening is used as the feedback signal and transmitted to the material layer thickness controller.

[0039] Through the above ten steps, the optimized control of the sintering material layer under the condition of wind pressure balance is achieved.

[0040] The method of the present invention has the following advantages:

[0041] 1. The control method proposed in the original invention can effectively reduce the adverse effects of fluctuations in the physical state of raw materials, such as particle density, particle size, local water content, etc., on the sintering and combustion process, and improve the quality of sintered ore products;

[0042] 2. The control method proposed in the original invention can effectively reduce the adverse effects of fluctuations in the mixing and granulation effects of raw materials on the sintering and combustion process, and improve the quality of sintered ore products;

[0043] 3. The control method proposed in the original invention can effectively reduce the adverse effects of unexpected situations such as air leakage in the sintering machine, air leakage in the flue, and air leakage in the air duct on the sintering combustion process, and improve the quality of sintered ore products;

[0044] 4. Real-time adjustment of the material layer thickness reduces the impact of raw material performance fluctuations, production status fluctuations and equipment status fluctuations on sintering production. While improving production stability, it optimizes the sintering material layer thickness and increases the unit time output of sintered ore;

[0045] 5. By balancing the negative pressure of the wind box and adjusting the thickness of the material layer at the same time, the sintering production parameters are optimized online, and the thickness of the sintering material layer is automatically adjusted. While ensuring the product quality of the sintering machine, the output is increased, so that the sintering production is comprehensively optimized. Description of the drawings:

[0046] Figure 1 Process detection system diagram of the present invention

[0047] Figure 2 Block diagram of the control system of the present invention

[0048] Figure 3 Flowchart of the control method of the present invention Specific implementation method:

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] Example:

[0051] Taking a typical domestic sintering machine with 18 wind boxes for air extraction as an example, the present invention is described as follows:

[0052] The process detection system of the present invention is shown in FIG. Figure 1, the sintering machine in the figure only captures the section of the head wheel and the first three bellows. Above the head wheel is the feed port of the sintering machine, where the material is discharged to the sintering machine trolley by the material distribution device. There is a set of fine-tuning gates at the feed port of this embodiment, which are controlled by the five actuators MV01~05, and the valve opening can be adjusted according to the given signal. LT01~05 is a radar level meter, which is used to detect the material level height on the sintering machine head trolley. The radar level meter signal is fed back to the fine-tuning gate controller LIC01~05, which directly controls the action of the fine-tuning gate, forming a sintering material distribution thickness control subsystem. Each wind box inlet is equipped with a damper to control the inlet air volume, which is operated by the electric actuator HZ01~03, and the bellows pipeline valve opening can be adjusted according to the given signal. PE01~03a / b, PT01~03a / b, PI01~03a / b are pressure detection components, pressure transmitters and pressure displays, which are used to detect the pressure of sintering machine 1~3# bellows. The 1~3# bellows pressure detection signals are fed back to the respective damper controllers HIC01~03, directly controlling the action of the bellows dampers, forming the bellows pressure control subsystem of the sintering machine. Under the action of the bellows pressure control subsystem of the sintering machine, the pressure of each bellows is kept balanced, which can ensure the combustion stability of the sintering machine. In this case, the opening setting value of the bellows damper controller can characterize the load utilization rate of the current bellows to a certain extent, and it is transmitted as a feedback value to the material layer thickness controller THC, so that the material thickness control subsystem and the bellows pressure control subsystem can be coordinated and controlled, and the real-time optimization control of the material layer thickness can be realized on the basis of wind pressure balance.

[0053] The control principle of the present invention is shown in Figure 2 . The goal of this control method is to adjust the material layer thickness in real time while ensuring the stability of the bellows pressure at the head of the sintering machine, so as to comprehensively optimize the output and quality of the sintering machine. The system consists of a closed-loop main control system and two sub-control systems. Among them, the control object of the material thickness control subsystem is the material layer thickness at the feeding point of the sintering machine, the actuator is the fine-tuning gate, the detection mechanism is the material level radar, and the material level signal is fed back to the fine-tuning gate controller to form a closed-loop control system. The fine-tuning gate controller can use any controller that meets the performance conditions, such as PID controller, fuzzy controller, etc. Among them, the control object of the bellows pressure control subsystem is the wind pressure of the bellows, the actuator is the damper actuator, the detection mechanism is the pressure transmitter, and the pressure signal is fed back to the bellows controller to form a closed-loop control system. The bellows controller can use any controller that meets the performance conditions, such as PID controller, fuzzy controller, etc. Among them, the control object of the main control system is composed of the fabric thickness control subsystem and the bellows pressure control subsystem connected in series. The control instructions are issued to the subsystem, which is executed autonomously inside the subsystem. The air door opening signal of the 1~3# bellows is used as the system feedback signal and transmitted to the material layer thickness controller. The controller calculates the set value of the material layer thickness based on this.

[0054] The control method flow chart of the present invention is shown in Figure 3 . It can be described step by step as follows:

[0055] Step 1: Calculate the air door opening setting value VF according to the target unit output of the sintering machine set1 , the calculation method is as follows:

[0056]

[0057] Among them, VF set1 =[vf(1) set1 ,vf(2) set1 ,vf(3) set1 ],vf(i) set1 represents the primary setting value of the air door opening of the ith air box, K = [k1, k2, k3] is the empirical coefficient of the 1st to 3rd air boxes, M a is the target unit output of the sintering machine, and M0 is the designed unit output of the sintering machine.

[0058] Step 2: Set the secondary value VF according to the air door opening set2 , calculate the bellows damper error VF err , the calculation method is as follows:

[0059] VF err =VF set1 -VF set2

[0060] Among them, rank(VF err )=1×3.

[0061] Step 3: Based on the bellows damper error VF err , calculate the material layer thickness setting value H set , the calculation method is as follows:

[0062] H set =G0(f(VF err , W))

[0063] Among them, the bellows damper error VF err That is, the error value of the main controller, W = [w1, w2, w3] T is the weight coefficient vector, G0(s) is the main controller transfer function, which can be designed as a specific function expression that meets the performance requirements. A feasible function expression is α0, α1, α2 are controller parameters, which can be obtained by zero-pole configuration or experimental methods. f(X, Y) is the bellows-thickness conversion function, which is used to characterize the correlation between the bellows state and the material layer thickness value. A feasible function expression is f(X, Y) = (X-θ) × Y, where X and Y are both in matrix form, θ is the activation threshold of X, and X×Y represents the cross product operation between matrices. The above is only an embodiment of G0(s) and f(X, Y). Other forms of transfer function are also included in the protection of the present invention.

[0064] Step 4: Calculate the material layer thickness error H according to the deviation between the set thickness value and the thickness detection value. err , the calculation method is as follows:

[0065] H err =H set -H

[0066] Among them, rank(H err )=1×n, n is the number of radar level meters distributed horizontally. Figure 1 In the embodiment shown, n=5.

[0067] Step 5: According to the material layer thickness error H err , calculate the fine-tuning gate setting value VL set , the calculation method is as follows:

[0068] V L set =G1(H err )

[0069] Among them, rank(VL set ) = 1 × n. Material layer thickness error H err That is, the error value of the fine-tuning gate controller, G1(s) is the transfer function group of the fine-tuning gate controller, which can be designed as a specific function expression that meets the performance requirements. Figure 1 Taking the case where n=5 in the embodiment shown as an example, a feasible function expression is:

[0070]

[0071] where α 10 , α 11 , α 12 , α 20 , α 21 , α 22 , α 30 , α 31 , α 32 , α 40 , α 41 , α 42 , α 50 , α 51 , α52 is a controller parameter group, which can be obtained by zero-pole configuration or experimental method. The above is only one embodiment of G1(s), and other forms of transfer function are also included in the protection of the present invention.

[0072] Step 6: Set the fine-tuning gate value VL set The signal is sent to the fine-tuning gate actuator to adjust the fine-tuning gate to the set opening degree. The mixed material is spread on the sintering trolley through the fine-tuning gate. At the outlet of the fine-tuning gate, the thickness of the material layer on the sintering trolley is detected by the radar level meter. The material layer thickness value detected is recorded as H and sent to the fine-tuning gate controller as the feedback signal of the material thickness control subsystem.

[0073] Step 7: Calculate the bellows pressure error PF based on the deviation between the bellows pressure standard value and the bellows pressure detection value err , the calculation method is as follows:

[0074] PF err =PF s -PF

[0075] Among them, rank(PF err )=rank(PF s )=rank(PF)=1×3.

[0076] Step 8: According to the bellows pressure error PF err , calculate the secondary setting value VF of the air door opening set2 , the calculation method is as follows:

[0077] VF set2 =G2(PF err )

[0078] Among them, rank(VF set2 )=1×3. Bellows pressure error PF err is the bellows controller error value, G2(s) is the bellows controller transfer function group, which can be designed as a specific function expression that meets the performance requirements. Figure 1 Taking the embodiment shown as an example, a feasible function expression is:

[0079]

[0080] where α 10 , α 11 , α 12 , α 13 , α 20 , α 21 , α 22 , α 23 , α 30 , α 31, α 32 , α 33 is a controller parameter group, which can be obtained by zero-pole configuration or experimental method. The above is only one embodiment of G2(s), and other forms of transfer function are also included in the protection of the present invention.

[0081] Step 9: Set the damper opening to the secondary setting value VF set2 The signal is sent to the damper actuator to adjust the damper to the set opening degree. The main exhaust fan of the sintering machine exhausts the sintering machine bellows through the large flue and the wind box inlet branch pipe. The pressure of each wind box is detected by the pressure sensor, and the signal is transmitted through the pressure transmitter. The detected wind box pressure value is recorded as PF, which is sent to each wind box controller as the feedback signal of the wind box pressure control subsystem.

[0082] Step 10: Ignoring the response time of the damper actuator, it can be approximately assumed that the secondary setting value VF of the damper opening of 1~3# wind boxes is set2 Equal to the actual value of the damper opening. In order to reduce the hysteresis effect in the system, this method uses the damper opening secondary setting value VF set2 The actual value of the air door opening is used as the feedback signal and transmitted to the material layer thickness controller.

[0083] Through the above ten steps, the optimized control of the sintering material layer under the condition of wind pressure balance is achieved.

Claims

1. A sintering material layer control method based on wind pressure balance, characterized in that: The method comprises the following steps: Step 1: Calculate the air door opening setting value VF according to the target unit output of the sintering machine set1 , the calculation method is as follows: Among them, VF set1 =[vf(1) set1 ,vf(2) set1 ,vf(3) set1 ],vf(i) set1 represents the primary setting value of the air door opening of the ith air box, K = [k1, k2, k3] is the empirical coefficient of the 1st to 3rd air boxes, M a is the target unit output of the sintering machine, and M0 is the designed unit output of the sintering machine; Step 2: Set the secondary value VF according to the air door opening set2 , calculate the bellows damper error VF err , the calculation method is as follows: VF err =VF set1 -VF set2 Among them, rank(VF err ) = 1 × 3; Step 3: Based on the bellows damper error VF err , calculate the material layer thickness setting value H set , the calculation method is as follows: H set =G0(f(VF err ,W)) Among them, the bellows damper error VF err That is the error value of the main controller, W = [w1, w2, w3] T is the weight coefficient vector, G0(s) is the main controller transfer function, and the expression is α0, α1, α2 are controller parameters, which can be obtained by zero-pole configuration or experimental method; f(X, Y) is the bellows-thickness conversion function, which is used to characterize the correlation between the bellows state and the material layer thickness value. A feasible function expression is f(X, Y) = (X-θ) × Y, where X and Y are both in matrix form, θ is the activation threshold of X, and X×Y represents the cross product operation between matrices; Step 4: Calculate the material layer thickness error H according to the deviation between the set thickness value and the thickness detection value. err , the calculation method is as follows: H err =H set -H Among them, rank(H err ) = 1 × n, n is the number of radar level meters distributed laterally; Step 5: According to the material layer thickness error H err , calculate the fine-tuning gate setting value VL set , the calculation method is as follows: VL set =G1(H err ) Among them, rank(VL set )=1×n; Material layer thickness error H err That is, the error value of the fine-tuning gate controller, G1(s) is the transfer function group of the fine-tuning gate controller; when n=5, a feasible function expression is: where α 10 ,α 11 ,α 12 ,α 20 ,α 21 ,α 22 ,α 30 ,α 31 ,α 32 ,α 40 ,α 41 ,α 42 ,α 50 ,α 51 ,α 52 is the controller parameter set, which can be obtained by zero-pole configuration or experimental method; Step 6: Set the fine-tuning gate value VL set The signal is sent to the fine-tuning gate actuator to adjust the fine-tuning gate to the set opening degree. The mixed material is spread on the sintering trolley through the fine-tuning gate. At the outlet of the fine-tuning gate, the thickness of the material layer on the sintering trolley is detected by the radar level meter. The thickness of the material layer detected is recorded as H and sent to the fine-tuning gate controller as the feedback signal of the material thickness control subsystem. Step 7: Calculate the bellows pressure error PF based on the deviation between the bellows pressure standard value and the bellows pressure detection value err , the calculation method is as follows: PF err =PF s -PF where rank(PF err ) = rank(PF s ) = rank(PF) = 1×3; Step 8: According to the bellows pressure error PF err , calculate the secondary setting value VF of the air door opening set2 , the calculation method is as follows: VF set2 =G2(PF err ) Among them, rank(VF set2 )=1×3; bellows pressure error PF err That is the error value of the bellows controller, G2(s) is the transfer function group of the bellows controller, and the function expression is: where α 10 ,α 11 ,α 12 ,α 13 ,α 20 ,α 21 ,α 22 ,α 23 ,α 30 ,α 31 ,α 32 ,α 33 is the controller parameter set, which can be obtained by zero-pole configuration or experimental method; Step 9: Set the damper opening to the secondary setting value VF set2 The signal is sent to the damper actuator to adjust the damper to the set opening degree. The main exhaust fan of the sintering machine exhausts the sintering machine bellows through the large flue and the bellows inlet branch pipe. The pressure of each bellows is detected by the pressure sensor, and the signal is transmitted through the pressure transmitter. The detected bellows pressure value is recorded as PF, which is sent to each bellows controller as the feedback signal of the bellows pressure control subsystem. Step 10: Ignoring the response time of the damper actuator, it can be approximately assumed that the secondary setting value VF of the damper opening of 1~3# wind boxes is set2 Equal to the actual value of the damper opening; in order to reduce the hysteresis effect in the system, the damper opening secondary setting value VF is used set2 The actual value of the air door opening is used as the feedback signal and transmitted to the material layer thickness controller.

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