A method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit

Abstract

This invention relates to a method for predicting the scraper force of the submerged roller system in a hot-dip galvanizing mill, mainly solving the problem that existing methods cannot predict the scraper force of the submerged roller system in hot-dip galvanizing mills online. The technical solution is as follows: a method for predicting the scraper force of the submerged roller system in a hot-dip galvanizing mill, comprising the following steps: collecting equipment parameters of the scraper mechanism of the hot-dip galvanizing mill; collecting strip steel production process parameters; collecting scraper process parameters; collecting power parameters of the roller system; calculating the incremental value of the stabilizing roller scraper force; setting the initial value of the stabilizing roller scraper force; calculating the stabilizing roller scraper force; determining whether the stabilizing roller scraper force meets the conditions; calculating the scraper force of the submerged roller and the straightening roller; calculating the contact force between the scraper blades of the submerged roller, the stabilizing roller, and the straightening roller and the roller surface; calculating the total frictional force generated by the scraper on the submerged roller, the stabilizing roller, and the straightening roller under dynamic conditions; calculating the frictional resistance torque generated by each scraper on the roller surface; and outputting the calculated values ​​of the scraper force of the submerged roller, the stabilizing roller, and the straightening roller. This invention provides high prediction accuracy.

Description

Technical Field

[0001] This invention relates to a method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit. Specifically, it relates to a method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit during the hot-dip aluminizing and zinc galvanizing process, and belongs to the technical field of submerged roller system equipment and process control technology for hot-dip aluminizing and zinc galvanizing units. Background Technology

[0002] Hot-dip aluminizing and zinc plating is the final process in the production of hot-dip aluminized and zinc-plated steel strip. The surface quality of the strip, such as the uniformity of the aluminized and zinc plating thickness and the deviation in plating thickness between the upper and lower surfaces, are the main indicators for measuring the surface quality of hot-dip aluminized and zinc-plated steel strip. During the hot-dip aluminizing and zinc plating process, the steel strip first undergoes a continuous annealing process, then enters the submerged roller system (composed of submerged rollers, stabilizing rollers, and straightening rollers) in the zinc pot, and then exits the zinc pot into the air knife area to scrape off the excess zinc layer on the surface of the steel strip, and finally cools and forms the final shape.

[0003] Because the zinc pot contains a lot of zinc dross, such as scum and sediment, the sediment will fall onto the surface of each roll in the submerged roll system. If a large amount accumulates, it will cause roll marks on the strip surface, directly affecting the surface quality of the strip. Therefore, a scraper mechanism is needed to automatically scrape off the zinc dross from the roll surface. Each roll in the submerged roll system is equipped with a scraper, see [link to relevant documentation]. Figure 1 , Figure 2 The submerged roller and the stabilizing roller use the same set of scraper mechanisms, which have a main scraper and an auxiliary scraper respectively. The main scraper scrapes the surface of the submerged roller, while the auxiliary scraper scrapes the surface of the stabilizing roller. The straightening roller is equipped with a separate set of scrapers.

[0004] The force exerted by the scraper on the roller surface can be decomposed into contact force and friction force. However, in actual production, it is difficult to quantitatively control the scraper force, making precise control of the scraper challenging. Therefore, it is necessary to quantitatively predict the scraper force to avoid excessive force causing roller jamming or insufficient force failing to achieve thorough scraping. Currently, the scraper mechanism in the on-site unit uses a cylinder-driven four-bar linkage, adjusting the cylinder pressure to scrape zinc. This mechanism cannot directly predict the scraper force, resulting in blind control of the scraper and insufficient adjustment range and force.

[0005] In the existing technology, there is no method for predicting the scraper force of the submerged roller system in hot-dip aluminizing and zinc galvanizing units. Current research on this type of work mainly focuses on the improvement and optimization of the scraper structure.

[0006] Chinese patent CN214400674U discloses a self-controlled submerged roller scraper for hot-dip galvanized sheet production equipment. It uses a variable frequency motor to drive a double-row chain to rotate the wheel, which in turn moves the scraper arm back and forth to achieve its position on the submerged roller surface. This structure is reasonable, resistant to high temperature, and features automatic mechanical and electrical control, enabling high-quality, high-yield, low-zinc-consumption hot-dip galvanized sheet production and improving efficiency.

[0007] Chinese patent application CN112877633A discloses a self-controlled submerged roller scraper for hot-dip galvanized sheet production and its usage method. This invention uses a variable frequency motor (6), a double-row chain drive wheel (7) to drive a double-row chain (4), which in turn drives the driven wheel (9) of the double-row chain. During operation, the double-row chain (4) drives the scraper seat housing (15) to move in the same direction via the scraper seat insert plate (17) until it reaches the set position. Then, cylinders 1 (19) and 2 (22) are activated. The cylinder extension shafts of cylinders 1 (19) and 2 (22) extend and retract, causing the long and short arm devices of the scraper arm to move back and forth, adjusting the positions of scraper blades 1 and 2 on the submerged roller. The beneficial effects of this invention are: reasonable structure, high temperature resistance, automatic mechanical and electrical control, enabling high-quality, high-yield, low-zinc-consumption hot-dip galvanized sheet production, and improved efficiency.

[0008] Chinese Patent CN207362320U discloses a submerged roller scraper device for hot-dip galvanized zinc wire zinc pots. This invention solves the problems of severe wear, poor lubrication, screw deformation, and jamming during the movement of existing submerged roller scrapers. The device includes a frame beam, a screw mounted on the top of the frame beam, a submerged roller fixedly connected to the bottom of the frame beam, a track, a traveling mechanism, and a scraper mechanism. The traveling mechanism includes a frame, a nut, support rollers, and guide rollers. The scraper mechanism includes a cylinder, a connecting rod, a scraper arm, and a scraper. It can adapt to the harsh environment of high temperature and severe zinc ash and dross adhesion in the zinc pot area, and effectively prevents movement jamming, screw deformation, poor lubrication, and severe wear under these conditions. It has the advantages of compact structure, low maintenance workload, high standardization, and long service life.

[0009] Chinese Patent CN202766606U discloses a scraper for a hot-dip galvanized aluminum-zinc immersion roller. This utility model relates to a scraper for a hot-dip galvanized aluminum-zinc immersion roller, comprising a scraper head, a scraper head support rod, a scraper base, and a base moving track. The scraper head is fixedly mounted on the end of the scraper head support rod, and the other end of the scraper head support rod is fixedly mounted on the scraper base. The scraper base is equipped with a clamping device for pressing the scraper head. The scraper base can move along the base moving track, which is parallel to the axis of the immersion roller. A lead screw is provided on the scraper base, and the lead screw is mounted on bearing seats at both ends of the base moving track. One end of the lead screw is driven by a motor and is linked to the screw sleeve of the scraper base. This utility model, by setting up a scraper, removes the deposits on the immersion roller, allowing the immersion roller to work continuously for a long time, improving work efficiency. At the same time, it maintains a certain smoothness on the surface of the immersion roller, preventing nodule formation, thus ensuring the surface quality of the strip steel during operation.

[0010] Therefore, in order to ensure the normal production of hot-dip aluminized zinc galvanizing units and improve the quality of aluminized zinc galvanizing of strip steel products, it is necessary to study a method for predicting the scraper force of the submerged roller system in hot-dip aluminized zinc galvanizing units. Summary of the Invention

[0011] The purpose of this invention is to provide a method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc-plating mill, mainly solving the technical problem that the scraper force of the submerged roller system in existing hot-dip aluminizing and zinc-plating mills cannot be predicted online. The method of this invention realizes the measurement and prediction of the scraper force applied to the roller surface by the scraper system of the submerged roller system in a hot-dip aluminizing and zinc-plating mill, and achieves precise control of the scraper system of the submerged roller system in a hot-dip aluminizing and zinc-plating mill. This provides support for the fine slag removal of each roller surface in the submerged roller system and the reduction of the incidence of roller printing defects on the surface of high-precision strip steel.

[0012] The technical concept of this invention is based on the characteristics of the hot-dip aluminizing and zinc-plating unit's production process, combined with the working characteristics of the submerged roller system and its scraper system. Taking the scraper force of the stabilized roller as a foundation, and comprehensively considering key process variables such as the scraper angle and cylinder pressure of the scraper mechanism, the invention obtains optimized conditions that satisfy the actual working torque coefficient of each roller in the submerged roller system through an optimized calculation method that gradually approximates the actual working conditions of the submerged roller system. This yields the scraper force of each scraper mechanism that is consistent with the actual working conditions of the submerged roller system, thus establishing a predictive model for the scraper force of the submerged roller system in the hot-dip aluminizing and zinc-plating unit.

[0013] In the method of this invention, the subscript letters c, w, and j in the parameters represent the submerged roller, the stabilizing roller, and the straightening roller, respectively.

[0014] In the hot-dip aluminizing and zinc-plating unit of the present invention, the scraper mechanism of the submerged roller and the scraper mechanism of the stabilizing roller in the submerged roller system are the same scraper mechanism. The scraper mechanism is provided with a main scraper for scraping the surface of the submerged roller and an auxiliary scraper for scraping the surface of the stabilizing roller. The straightening roller in the hot-dip aluminizing and zinc-plating unit submerged roller system is provided with a straightening roller scraper mechanism, and the straightening roller scraper mechanism is provided with a straightening roller scraper.

[0015] The technical solution adopted in this invention is a method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit, comprising the following steps:

[0016] 1) Collect the equipment parameters of the scraper mechanism of the hot-dip aluminizing and zinc galvanizing unit, including the cross-sectional area S of the cylinder of the scraper mechanism of the submerged roller and the stabilizing roller, the cross-sectional area S′ of the cylinder of the scraper mechanism of the straightening roller, the effective length l0 of the scraper drive end rod of the scraper mechanism of the submerged roller and the stabilizing roller, the vertical distance l1 from the tip extension line of the main scraper to the hinge, the vertical distance l2 from the tip extension line of the auxiliary scraper to the hinge, the effective length l′0 of the scraper drive end rod of the straightening roller scraper mechanism, the vertical distance l′1 from the tip extension line of the scraper to the hinge, and the radius R of the submerged roller, the stabilizing roller and the straightening roller. c R w R jThe blade length of the main scraper of the scraper mechanism for the submerged roll and the stabilizing roll is b0, the blade length of the auxiliary scraper is b1, the blade length of the straightening roll scraper mechanism is b′0, and the gravity of the scraper mechanism for the submerged roll and the stabilizing roll is G. g The gravity G′ of the straightening roller scraper mechanism g The angle β between the extension line of the scraper blade and the scraper rod c β w β j ;

[0017] 2) Collect strip steel production process parameters, including strip steel running speed V, strip steel tension T, strip width B and thickness H, strip density ρ, and wrap angle θ between the strip steel and the submerged roll, stabilizing roll, and straightening roll. c θ w θ j The amount of zinc dross deposited on the surface of the submerged roll, stabilizing roll, and straightening roll was measured, Q. c Q w Q j ;

[0018] 3) Collect the scraper process parameters, including the input pressure p of the drive cylinder of the submerged roller and stabilizing roller scraper mechanism, the input pressure p′ of the drive cylinder of the straightening roller scraper mechanism, the initial rotation angle α0 of the scraper rod of the submerged roller and stabilizing roller, and the initial rotation angle α′0 of the scraper rod of the straightening roller.

[0019] 4) Collect the dynamic parameters of the roller system, including the maximum torque coefficients of the submerged roller, stabilizing roller, and straightening roller [ξ]. max ], minimum value [ξ min The maximum effective driving torque [M] of the submerged roll, stabilizing roll, and straightening roll. max Minimum value [M] min The scraper force distribution coefficient λ of the submerged roller and stabilizing roller scraper mechanism, the scraper force setpoint [F], and the minimum scraper force of the stabilizing roller [F]. w ] min Maximum value [F] w ] max The initial value of the change in the force of the stabilizer roller scraper is χ = 0, and the increment step number is set to n.

[0020] 5) Calculate the incremental force of the stabilizing roller scraper.

[0021] 6) Set the stabilizing roller scraper force F according to the equipment parameters. w0 Initial value;

[0022] 7) Calculate the stabilizing roller scraper force F w =F w0 +χΔF;

[0023] 8) Determine if the stabilizing roller scraper force meets the condition: [Fw ] min ≤F w ≤[F w ] max If true, proceed to step 9); otherwise, the program ends.

[0024] 9) Calculate the scraper force F of the submerged roll and the straightening roll respectively. c F j ,

[0025]

[0026] p′S′l′0=F j l′1+G′ g l′1 / 2 (2);

[0027] 10) Calculate the contact force N between the scraper blades of the submerged roll, stabilizing roll, and straightening roll and the roll surface, respectively. c N w N j ,

[0028]

[0029] 11) Calculate the total frictional force f generated by the scraper on the submerged roll, stabilizing roll, and straightening roll under dynamic conditions. c f w f j ;

[0030] 12) Calculate the frictional resistance torque M generated by each scraper on the surface of the submerged roll, stabilizing roll, and straightening roll. c M w M j ,

[0031]

[0032] 13) Calculate the frictional driving torque M of the strip on the submerged roll, stabilizing roll, and straightening roll respectively. qc M qw M qj ;

[0033] 14) The scraping force value of the output scraper mechanism includes:

[0034] 14.1) Calculate the moment coefficient ξ of the submerged roll, stabilizing roll, and straightening roll respectively. c ξ w ξ j ,

[0035]

[0036] 14.2) Determine the torque coefficient ξ c ξw ξ j Does it meet the requirements?

[0037]

[0038] Determine if all the above conditions are met. If not, proceed to step 14.3; if met, output the scraper force F of each roller. c F w and F j ;

[0039] 14.3) Determine if χ≤n holds true. If true, perform χ+1 iterations and go to step 7); if false, go to step 4).

[0040] Furthermore, step 11) of the method of the present invention includes the following steps:

[0041] 11.1) Divide the scrapers of the submerged roll, stabilizing roll, and straightening roll into m segments along their blade edges respectively;

[0042] 11.2) Calculate the surface friction coefficient μ between the blade and the roll surface per unit length in the i-th (i = 1, 2, ..., m) segment of the submerged roll, stabilizing roll, and straightening roll, respectively. ci μ wi μ ji ,

[0043]

[0044] In equation (7), K c K w K j The zinc dross deposition coefficient on the surfaces of the submerged roll, stabilizing roll, and straightening roll;

[0045] 11.3) Calculate the frictional force f between each segment of the scraper blade and the roller surface of the submerged roller, stabilizing roller, and straightening roller respectively. ci f wi f ji ,

[0046]

[0047] In formula (8), b0 is the blade length of the main scraper of the submerged roller and stabilizing roller scraper mechanism; b1 is the blade length of the auxiliary scraper; b′0 is the blade length of the straightening roller scraper mechanism; m is the number of the main scraper blade and auxiliary scraper blade of the submerged roller and stabilizing roller, and the number of the straightening roller scraper blades.

[0048] 11.4) Calculate the total frictional force f generated by each scraper on the surfaces of the submerged roll, stabilizing roll, and straightening roll. c f w f j ,

[0049]

[0050] Furthermore, step 13) of the method of the present invention includes the following steps:

[0051] 13.1) Calculate the roll surface pressure P of the strip on the submerged roll, stabilizing roll, and straightening roll respectively. c P w P j ,

[0052] In equation (10), g is the value of gravitational acceleration;

[0053] 13.2) Calculate the frictional torque M of the strip on the submerged roll, stabilizing roll, and straightening roll respectively. qc M qw M qj ,

[0054] In equation (11), μ0 is the coefficient of friction between the strip and the roll surface.

[0055] This invention fully utilizes actual production data from the field, establishing a scraper force prediction model using strip steel production process parameters and submerged roll system scraper mechanism equipment parameters. Simultaneously, it introduces the submerged roll system torque coefficient as a key control factor. This torque coefficient is a crucial indicator reflecting the dynamic characteristics of the submerged roll system and represents the comprehensive influence of various external loads on the roll system. This improves the consistency between the model and actual operating conditions, and indirectly enhances the accuracy of scraper force prediction. It solves the problem of insufficient control parameters in existing equipment units, which prevents online prediction of the submerged roll system and refined control of scraper force. It also provides a foundation for intelligent submerged roll systems, offering a method for achieving high-precision, high-quality advanced strip steel production, reducing slag on the roll surface, and lowering the incidence of strip steel roll marks defects.

[0056] Compared with existing technologies, this invention has the following positive effects: 1. The method of this invention utilizes actual process data from hot-dip aluminizing and zinc galvanizing units for analysis, and also considers the dynamic force characteristics of the submerged roller system. This enables precise prediction of scraper force and refined control of the scraper mechanism under complex working conditions. The prediction accuracy of the scraper force of the submerged roller system in hot-dip aluminizing and zinc galvanizing units is high, with an error of less than 10%. 2. This invention reduces the amount of zinc dross deposited on the roller surface within a working cycle, saving workers' workload for unit maintenance after shutdown, improving the working life of the submerged roller system, and reducing production costs. 3. This invention can collect data online in real time and predict the scraper force of the submerged roller system in real time, realizing online monitoring of the scraper mechanism. In subsequent production processes, it can predict the scraper force under conditions for producing various specifications of strip steel, saving investment. Attached Figure Description

[0057] Figure 1 A schematic diagram of the scraper mechanism for the submerged roller and stabilizing roller of the hot-dip aluminum-zinc galvanizing unit of the present invention.

[0058] Figure 2 A schematic diagram of the straightening roller scraper mechanism of the hot-dip aluminum-zinc galvanizing unit of the present invention.

[0059] Figure 3 A schematic diagram of the main process for calculating the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit according to the method of the present invention.

[0060] Figure 4 The present invention provides a schematic diagram of the sub-process for calculating the total frictional force generated by the scraper on the submerged roller, stabilizing roller, and straightening roller under dynamic conditions.

[0061] Figure 5 A schematic diagram of the sub-process of the method of the present invention for calculating the frictional driving torque of the strip on the submerged roll, the stabilizing roll and the straightening roll.

[0062] Figure 6 A schematic diagram of the sub-process for verifying the calculation value of the scraper force of the submerged roller system in the hot-dip aluminizing and zinc galvanizing unit according to the method of the present invention.

[0063] Explanation of markings in the diagram: 1-Submerged roller, 2-Stabilizing roller, 3-Main scraper, 4-Auxiliary scraper, 5-Scraper bar of the scraper mechanism of the submerged roller and stabilizing roller, 6-Hinge of the scraper mechanism of the submerged roller and stabilizing roller, 7-Drive rod of the scraper mechanism of the submerged roller and stabilizing roller, 8-Cylinder of the scraper mechanism of the submerged roller and stabilizing roller, 9-Straightening roller, 10-Straightening roller scraper bar, 11-Straightening roller scraper hinge, 12-Straightening roller scraper drive rod, 13-Straightening roller scraper cylinder, 14-Straightening roller scraper. Detailed Implementation

[0064] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0065] See attached document Figure 1 , 2The hot-dip galvanizing mill includes a submerged roller and a stabilizing roller scraper mechanism, as well as a straightening roller scraper mechanism, comprising: 1. Submerged roller; 2. Stabilizing roller; 3. Main scraper; 4. Auxiliary scraper; 5. Scraper bar for the submerged roller and stabilizing roller scraper mechanism; 6. Hinge for the submerged roller and stabilizing roller scraper mechanism; 7. Drive rod for the submerged roller and stabilizing roller scraper mechanism; 8. Cylinder for the submerged roller and stabilizing roller scraper mechanism; 9. Straightening roller; 10. Straightening roller scraper bar; 11. Straightening roller scraper hinge; and 12. Straightening roller scraper. The drive rod 12, the straightening roller scraper cylinder 13, and the straightening roller scraper 14 are characterized in that: the submerged roller and stabilizing roller scraper mechanism is composed of submerged roller 1, stabilizing roller 2, main scraper 3, auxiliary scraper 4, scraper rod 5 of the scraper mechanism of the submerged roller and stabilizing roller, hinge 6 of the scraper mechanism of the submerged roller and stabilizing roller, drive rod 7 of the scraper mechanism of the submerged roller and stabilizing roller, and cylinder 8 of the scraper mechanism of the submerged roller and stabilizing roller, and is formed by the main scraper 3 and the auxiliary scraper 4 through the scraper of the submerged roller and stabilizing roller. The hinge 6 of the blade mechanism is connected to the scraper rod 5 of the submerged roller and stabilizing roller scraper mechanism. The main scraper 3 acts on the submerged roller 1, and the auxiliary scraper 4 acts on the stabilizing roller 2. The scraper rod 5 of the submerged roller and stabilizing roller scraper mechanism is also connected to the drive rod 7 of the submerged roller and stabilizing roller scraper mechanism through the hinge 6. The drive rod 7 of the submerged roller and stabilizing roller scraper mechanism is driven by the cylinder 8 of the submerged roller and stabilizing roller scraper mechanism, thereby realizing the scraper... The mechanism's operation: The straightening roller scraper mechanism consists of a straightening roller 9, a straightening roller scraper rod 10, a straightening roller scraper hinge 11, a straightening roller scraper drive rod 12, a straightening roller scraper cylinder 13, and a straightening roller scraper 14. The straightening roller scraper 14 acts on the straightening roller and is fixed to the straightening roller scraper rod 10. The straightening roller scraper rod 10 is connected to the straightening roller scraper drive rod 12 through the straightening roller scraper hinge 11 and is driven to work by the straightening roller scraper cylinder 13.

[0066] Example 1, refer to Appendix Figure 1-6 A method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit includes the following steps:

[0067] 1) Collect the equipment parameters of the scraper mechanism of the aluminum-zinc plating unit, including the cross-sectional area S of the cylinder of the scraper mechanism of the submerged roller and the stabilizing roller, the cross-sectional area S′ of the cylinder of the straightening roller scraper mechanism, the effective length l0 of the scraper drive end rod of the submerged roller and the stabilizing roller scraper mechanism, the vertical distance l1 from the tip extension line of the main scraper to the hinge, the vertical distance l2 from the tip extension line of the auxiliary scraper to the hinge, the effective length l′0 of the scraper drive end rod of the straightening roller scraper mechanism, the vertical distance l′1 from the tip extension line of the scraper to the hinge, and the diameter R of the submerged roller, the stabilizing roller and the straightening roller. c R w R jThe blade length of the main scraper of the submerged roll and stabilizing roll scraper mechanism is b0, the blade length of the auxiliary scraper is b1, the blade length of the straightening roll scraper mechanism is b′0, and the gravity of the scraper mechanism of the submerged roll and stabilizing roll is G. g The gravity G′ of the straightening roller scraper mechanism g The angle β between the extension line of the scraper blade and the scraper rod c β w β j As shown in Tables 1, 2, and 3.

[0068] Table 1 Parameters of the Submerged Roller and Stabilizing Roller Scraper Mechanism

[0069]

[0070] Table 2 Parameters of the Straightening Roller Scraper Mechanism

[0071]

[0072] Table 3 Radius parameters of submerged roller system

[0073] Value / mm 300 100 100

[0074] 2) Collect strip steel production process parameters, including strip steel running speed V = 125 m / min, strip steel tension T = 16 kN, strip width B = 900 mm and thickness H = 2 mm, and strip density ρ = 7850 kg / m³. 3 The wrap angle θ between the strip and the submerged roll, stabilizing roll, and straightening roll c θ w θ j The amount of zinc dross deposited on the surface of the submerged roll, stabilizing roll, and straightening roll was measured, Q. c Q w Q j As shown in Table 4.

[0075] Table 4. Wrap angle and zinc dross deposition on each roll of the submerged roll system

[0076] Submerged rollers 120 68 Stabilizing roller 30 75 Correcting rollers 30 77

[0077] 3) Collect the scraper process parameters, including the input pressure p = 0.8 MPa of the drive cylinder of the submerged roller and stabilizing roller scraper mechanism, the input pressure p′ = 0.5 MPa of the drive cylinder of the straightening roller scraper mechanism, the initial rotation angle α0 = 12° of the scraper rod of the submerged roller and stabilizing roller, and the initial rotation angle α′0 = 10° of the scraper rod of the straightening roller.

[0078] 4) Collect the dynamic parameters of the roller system, including the maximum torque coefficients of the submerged roller, stabilizing roller, and straightening roller [ξ]. max ] = 3.4, minimum value [ξ min=1.3, the maximum effective driving torque [M] of the submerged roll, stabilizing roll, and straightening roll. max =2200 N·m, minimum value [M] min =1200 N.m, the scraper force distribution coefficient λ of the submerged roller and stabilizing roller scraper mechanism is 0.7, the scraper force setpoint [F] is 800 N, and the minimum scraper force of the stabilizing roller is [F]. w ] min =100N, maximum value [F w ] max =700N, initial value of the change in the stabilizing roller scraper force χ = 0, set the increment step n = 12;

[0079] 5) Calculate the incremental force of the stabilizing roller scraper.

[0080] 6) Set the stabilizing roller scraper force F according to the equipment parameters. w0 =100N initial value;

[0081] 7) Calculate the stabilizing roller scraper force F w =F w0 +χΔF, as shown in Table 5.

[0082] Table 5 Stabilizing Roller Scraper Force Parameters

[0083]

[0084] 8) Determine if the stabilizing roller scraper force meets the condition: [F w ] min ≤F w ≤[F w ] max If true, proceed to step 9); otherwise, the program ends.

[0085] 9) Calculate the scraper force F of the submerged roll and the straightening roll. c F j :

[0086]

[0087] p′S′l′0=F j l′1+G′ g l′1 / 2

[0088] The calculation results are shown in Table 6.

[0089] Table 6. Scraper Force Parameters for Submerged Rolls and Straightening Rolls

[0090]

[0091] 10) Calculate the contact force N between the scraper blades of the submerged roll, stabilizing roll, and straightening roll and the roll surface. cN w N j :

[0092]

[0093] The calculation results are shown in Table 7.

[0094] Table 7 Calculated values ​​of contact force between the scraper blade and the roller surface

[0095]

[0096] 11) Zinc slag deposition coefficient K on the surface of submerged rolls, stabilizing rolls and straightening rolls c =1.2, K w =1.01, K j =0.92, calculate the total frictional force f generated by the scraper on the submerged roll, stabilizing roll, and straightening roll under dynamic conditions. c f w f j As shown in Table 8.

[0097] Table 8 Calculated values ​​of friction force between the scraper blade and the roller surface

[0098]

[0099] 12) Calculate the frictional resistance torque M of the scraper on the submerged roller surface. c The frictional resistance torque M of the scraper on the stabilizing roller surface w The frictional resistance torque M between the scraper and the straightening roller surface j As shown in Table 9.

[0100] Table 9 Calculated values ​​of frictional resistance torque between the scraper blade and the roller surface, in N·mm.

[0101]

[0102] 13) The coefficient of friction between the strip and the roll surface μ0 = 0.15; calculate the frictional driving torque M of the strip on the submerged roll. qc The frictional driving torque M of the strip on the stabilizing roll qw The frictional driving torque M between the strip and the straightening roll qj As shown in Table 10.

[0103] Table 10 Calculated values ​​of frictional driving torque of strip steel against the roll surface, in N·mm.

[0104]

[0105] 14) Output scraper force value of the scraper mechanism:

[0106] 14.1) Calculate the moment coefficient ξ of the submerged roll, stabilizing roll, and straightening roll.c ξ w ξ j As shown in Table 11.

[0107]

[0108] Table 11 Torque coefficients of submerged rolls, stabilizing rolls, and straightening rolls

[0109] <![CDATA[Sinking roll moment coefficient ξ c > 2.1 2.5 1.1 1.09 1.7 1.9 2.6 2.9 2.7 1.3 0.9 <![CDATA[Stabilizer roll moment coefficient ξ c > 2.7 2.3 2.0 2.1 1.8 1.7 1 0.4 0.5 0.7 1.4 <![CDATA[Correction roller torque coefficient ξ c > 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8

[0110] Then, in step 14.2), the torque coefficient ξ is determined. c ξ w ξ j Does it meet the requirements?

[0111]

[0112] Determine if all the above conditions are met. If not, proceed to step 14.3; if met, output the scraper force F of each roller. c F w and F j ;

[0113] 14.3) Determine if χ≤n holds true. If true, perform χ+1 iterations and proceed to step 7). If false, proceed to step 4). After multiple optimization iterations, finally output the scraper force F of each roller. c F w and F j The force prediction of the scraper of the submerged roller system of the aluminized zinc plating unit was completed.

[0114] Table 12 Comparison of predicted and measured values ​​of scraper force for submerged rolls, stabilizing rolls, and straightening rolls

[0115] <![CDATA[Predicted value F of sinking roll scraper force c / N]]> 1274 1321 3.56％ <![CDATA[Predicted value of stabilizing roll scraper force F w / N]]> 478 465 3.79％ <![CDATA[Predicted value of correction roller scraper force F j / N]]> 234 257 8.94％

[0116] Example 1 effectively reduces the amount of zinc dross deposited on the roller surface of hot-dip aluminized zinc galvanizing units when producing strips with a width greater than or equal to 900 mm: Within one working cycle, the amount of zinc dross deposited on the submerged roller surface decreased from 7.3 kg / cycle before the method was used to 2.5 kg / cycle after the method was used. Correspondingly, the incidence of roller marks on the strip surface decreased from 8.2% to 1.7%. At the same time, the working life of the submerged roller system increased from an average of 6.7 cycles to 10.2 cycles. It can be seen that using this patent is very beneficial for reducing the amount of zinc dross deposited on the roller surface and the incidence of roller marks on the strip surface, and improving the working life of the submerged roller system.

[0117] Example 2, refer to Appendix Figure 1-6 A method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit includes the following steps:

[0118] 1) Collect the equipment parameters of the scraper mechanism of the aluminum-zinc plating unit, including the cross-sectional area S of the cylinder of the scraper mechanism of the submerged roller and the stabilizing roller, the cross-sectional area S′ of the cylinder of the straightening roller scraper mechanism, the effective length l0 of the scraper drive end rod of the submerged roller and the stabilizing roller scraper mechanism, the vertical distance l1 from the tip extension line of the main scraper to the hinge, the vertical distance l2 from the tip extension line of the auxiliary scraper to the hinge, the effective length l′0 of the scraper drive end rod of the straightening roller scraper mechanism, the vertical distance l′1 from the tip extension line of the scraper to the hinge, and the diameter R of the submerged roller, the stabilizing roller and the straightening roller. c R w R j The blade length of the main scraper of the scraper mechanism for the submerged roll and the stabilizing roll is b0, the blade length of the auxiliary scraper is b1, the blade length of the straightening roll scraper mechanism is b′0, and the gravity of the scraper mechanism for the submerged roll and the stabilizing roll is G. g The gravity G′ of the straightening roller scraper mechanism g The angle β between the extension line of the scraper blade and the scraper rod c β w β j As shown in Tables 13, 14, and 15.

[0119] Table 13 Parameters of the Submerged Roller and Stabilizing Roller Scraper Mechanism

[0120]

[0121] Table 14 Parameters of the Straightening Roller Scraper Mechanism

[0122]

[0123]

[0124] Table 15 Radius parameters of submerged roller system

[0125] Value / mm 300 100 100

[0126] 2) Collect strip steel production process parameters, including strip steel running speed V = 125 m / min, strip steel tension T = 14 kN, strip width B = 800 mm and thickness H = 1.2 mm, and strip density ρ = 7850 kg / m³. 3 The wrap angle θ between the strip and the submerged roll, stabilizing roll, and straightening roll c θ w θ j The amount of zinc dross deposited on the surface of the submerged roll, stabilizing roll, and straightening roll was measured, Q. c Q w Q j As shown in Table 16.

[0127] Table 16. Wrap Angle and Zinc Dross Deposition Amount on Roller Surface of Submerged Roller System

[0128] Submerged rollers 115 76 Stabilizing roller 20 69 Correcting rollers 20 71

[0129] 3) Collect the scraper process parameters, including the input pressure p = 0.7 MPa of the drive cylinder of the submerged roller and stabilizing roller scraper mechanism, the input pressure p′ = 0.3 MPa of the drive cylinder of the straightening roller scraper mechanism, the initial rotation angle α0 = 12° of the scraper rod of the submerged roller and stabilizing roller, and the initial rotation angle α′0 = 10° of the scraper rod of the straightening roller.

[0130] 4) Collect the dynamic parameters of the roller system, including the maximum torque coefficients of the submerged roller, stabilizing roller, and straightening roller [ξ]. max ] = 2.9, minimum value [ξ min =0.9, the maximum effective driving torque [M] of the submerged roll, stabilizing roll, and straightening roll. max =2000 N·m, minimum value [M] min =1000 N·m, the scraper force distribution coefficient λ of the submerged roller and stabilizing roller scraper mechanism is 0.6, the scraper force setpoint [F] is 850 N, and the minimum scraper force of the stabilizing roller is [F]. w ] min =100N, maximum value [F w ] max =900N, initial value of the change in the stabilizing roller scraper force χ = 0, set the increment step n = 12;

[0131] 5) Calculate the incremental force of the stabilizing roller scraper.

[0132] 6) Set the stabilizing roller scraper force F according to the equipment parameters. w0 =100N initial value;

[0133] 7) Calculate the stabilizing roller scraper force F w =F w0 +χΔF, as shown in Table 17.

[0134] Table 17 Stabilizing Roller Scraper Force Parameters

[0135]

[0136]

[0137] 8) Determine if the stabilizing roller scraper force meets the condition: [F w ] min ≤F w ≤[F w ] max If true, proceed to step 9); otherwise, the program ends.

[0138] 9) Calculate the scraper force F of the submerged roll and the straightening roll. c Fj :

[0139]

[0140] p′S′l′0=F j l′1+G′ g l′1 / 2; the calculation results are shown in Table 18.

[0141] Table 18 Scraper Force Parameters for Submerged Rolls and Straightening Rolls

[0142]

[0143] 10) Calculate the contact force N between the scraper blades of the submerged roll, stabilizing roll, and straightening roll and the roll surface. c N w N j ,

[0144] The calculated values ​​are shown in Table 19.

[0145] Table 19 Calculated values ​​of contact force between the scraper blade and the roller surface

[0146]

[0147] 11) Zinc slag deposition coefficient K on the surface of submerged rolls, stabilizing rolls and straightening rolls c =1.5, K w =0.91, K j =1.1, calculate the total frictional force f generated by the scraper on the submerged roll, stabilizing roll, and straightening roll under dynamic conditions. c f w f j As shown in Table 20.

[0148] Table 20 Calculated values ​​of friction force between the scraper blade and the roller surface

[0149]

[0150]

[0151] 12) Calculate the frictional resistance torque M of the scraper on the submerged roller surface. c The frictional resistance torque M of the scraper on the stabilizing roller surface w The frictional resistance torque M between the scraper and the straightening roller surface j As shown in Table 21.

[0152] Table 21 Calculated values ​​of frictional resistance torque between the scraper blade and the roller surface, in N·mm.

[0153]

[0154] 13) The coefficient of friction between the strip and the roll surface μ0 = 0.13; calculate the frictional driving torque M of the strip on the submerged roll. qc The frictional driving torque M of the strip on the stabilizing roll qw The frictional driving torque M between the strip and the straightening roll qj As shown in Table 22.

[0155] Table 22 Calculated values ​​of frictional driving torque of strip steel against the roll surface, in N·mm.

[0156]

[0157] 14) Verify that the calculated scraper force matches the actual working conditions:

[0158] 14.1) Calculate the moment coefficient ξ of the submerged roll, stabilizing roll, and straightening roll. c ξ w ξ j As shown in Table 23.

[0159]

[0160] Table 23 Torque coefficients of submerged rolls, stabilizing rolls, and straightening rolls

[0161]

[0162]

[0163] 14.2) Determine the torque coefficient ξ c ξ w ξ j Does it meet the requirements?

[0164]

[0165] Determine if all the above conditions are met. If not, proceed to step 14.3; if met, output the scraper force F of each roller. c F w and F j ;

[0166] 14.3) Determine if χ≤n holds true. If true, perform χ+1 iterations and proceed to step 7); if false, proceed to step 4. After multiple optimization iterations, finally output the scraper force F of each roller. c F w and F j The force prediction of the scraper of the submerged roller system of the aluminized zinc plating unit was completed.

[0167] Table 24 Comparison of predicted and measured values ​​of scraper force for submerged rolls, stabilizing rolls, and straightening rolls

[0168] <![CDATA[Predicted value F of sink roll scraper force c / N]]> 1075 1192 9.82％ <![CDATA[Predicted value of stabilizing roll scraper force F w / N]]> 505 537 5.96％ <![CDATA[Predicted value F of straightening roll scraper force j / N]]> 267 283 5.65％

[0169] Example 2 effectively reduces the amount of zinc dross deposited on the roller surface of the hot-dip aluminized zinc galvanizing unit when producing strip steel with a width of less than 900mm: Within one working cycle, the amount of zinc dross deposited on the roller surface of the submerged roller is reduced from 10.7kg / cycle before the method was used to 5.3kg / cycle after the method was used. Correspondingly, the incidence of roller marks on the strip steel surface is reduced from 9.8% to 2.6%. At the same time, the working life of the submerged roller system is increased from an average of 5.6 cycles to 8.4 cycles. It can be seen that the use of this patent is very beneficial to the reduction of zinc dross deposits on the roller surface and the incidence of roller marks on the strip steel surface, and improves the working life of the submerged roller system.

[0170] Examples 1 and 2 are for two different specifications of strip steel. Example 1 is for the prediction and control of the scraper force of the submerged roll system under the condition of producing wide strip steel with a width greater than or equal to 900 mm. Example 2 is for the prediction and control of the scraper force of the submerged roll system under the condition of producing narrow strip steel with a width less than 900 mm. These two examples 1 and 2 are representative and can be used as a reference for the unit to produce strip steel of relevant specifications.

[0171] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for predicting the force of a doctor of a sink roll train of a hot dip aluminized zinc unit, characterized in that, Includes the following steps: 1) Collect the equipment parameters of the scraper mechanism of the hot-dip aluminizing and zinc galvanizing unit, including the cross-sectional area of ​​the cylinder of the scraper mechanism for the submerged roller and the stabilizing roller. Cross-sectional area of ​​the cylinder of the straightening roller scraper mechanism The effective length of the scraper drive end rod of the scraper mechanism of the submerged roller and the stabilizing roller. The vertical distance from the extension line of the main scraper tip to the hinge The vertical distance from the extended line of the auxiliary scraper tip to the hinge The effective length of the scraper drive end rod of the straightening roller scraper mechanism The vertical distance from the extension line of the scraper tip to the hinge Radius of submerged roll, stabilizing roll and straightening roll , , The blade length of the main scraper of the scraper mechanism of the submerged roller and the stabilizing roller The blade length of the auxiliary scraper The blade length of the correcting roller scraper mechanism The gravity of the scraper mechanism of the submerged roller and the stabilizing roller is Gravity of the straightening roller scraper mechanism The angle between the extension line of the scraper blade and the scraper shank , , ; 2) Collect strip steel production process parameters, including strip steel running speed. strip tension strip width and thickness The density of the strip The wrap angle between the strip and the submerged rolls, stabilizing rolls, and straightening rolls. , , The amount of zinc dross deposited on the surfaces of the submerged roll, stabilizing roll, and straightening roll was measured. , , ; 3) Collect the scraper process parameters, including the input pressure of the drive cylinder of the submerged roller and stabilizing roller scraper mechanism. The input pressure of the drive cylinder of the straightening roller scraper mechanism The initial rotation angle of the scraper bar of the submerged roller and the stabilizing roller The initial rotation angle of the scraper bar of the straightening roller ; 4) Collect the dynamic parameters of the roller system, including the maximum torque coefficients of the submerged roller, stabilizing roller, and straightening roller. Minimum value Maximum effective driving torque of the submerged roll, stabilizing roll, and straightening roll Minimum value The scraper force distribution coefficient of the submerged roller and stabilizing roller scraper mechanism scraper force setting value Minimum value of stabilizer roller scraper force Maximum value Initial value of the change in the force of the stabilizing roller scraper Set the increment number ; 5) Calculate the incremental force of the stabilizer roller scraper. ; 6) Set the stabilizing roller scraper force according to the equipment parameters. Initial value; 7) Calculate the stabilizing roller scraper force ; 8) Determine if the stabilizing roller scraper force meets the requirements: If true, proceed to step 9; if false, the program ends. 9) Calculate the scraper force of the submerged roller and the straightening roller respectively. , , (1)， (2)； 10) Calculate the contact force between the scraper blades of the submerged roll, stabilizing roll, and straightening roll and the roll surface, respectively. , , , (3)； 11) Calculate the total frictional force generated by the scraper on the submerged roll, stabilizing roll, and straightening roll under dynamic conditions. , , Step 11) includes the following steps: 11.1) Divide the scrapers of the submerged roll, stabilizing roll, and straightening roll into m segments along their cutting edges, respectively; 11.2) Calculate the surface friction coefficient between the blade and the roll surface per unit length in the i-th (i=1,2,...,m) segment of the submerged roll, stabilizing roll, and straightening roll, respectively. , , , (7)， In equation (7), , , The zinc dross deposition coefficient on the surfaces of the submerged roll, stabilizing roll, and straightening roll; 11.3) Calculate the frictional force between each segment of the scraper blade and the roller surface of the submerged roller, stabilizing roller, and straightening roller respectively. , , , (8)， In equation (8), The blade length of the main scraper of the submerged roller and stabilizing roller scraper mechanism; The blade length of the auxiliary scraper; To correct the blade length of the roller scraper mechanism; The number of divisions for the main scraper blades and auxiliary scraper blades of the submerged roll and stabilizing roll, and the number of divisions for the scraper blades of the straightening roll; 11.4) Calculate the total frictional force generated by each scraper on the surface of the submerged roll, stabilizing roll, and straightening roll respectively. , , , (9)； 12) Calculate the frictional resistance torque generated by each scraper on the submerged roll, stabilizing roll, and straightening roll surface. , , , (4)； 13) Calculate the frictional driving torque of the strip on the submerged roll, stabilizing roll, and straightening roll respectively. , , ; 14) The scraping force value of the output scraper mechanism, including: 14.1) Calculate the torque coefficients of the submerged roll, stabilizing roll, and straightening roll respectively. , , , (5)； 14.2) Determining the torque coefficient , , Does it meet the requirements? (6)， Determine if all the above conditions are met. If not, proceed to step 14.

3. If met, output the scraper force of each roller. , and ; 14.3) Judgment Is it valid? If valid, proceed. The next iteration is performed, and the process proceeds to step 7). If the condition is not met, the process proceeds to step 4.

2. The method for predicting the scraper force of the submerged roller system in a hot-dip aluminizing and zinc galvanizing unit as described in claim 1, characterized in that, Step 13) includes the following steps: 13.1) Calculate the pressure of the strip on the submerged roll, stabilizing roll, and straightening roll respectively. , , , (10), in equation (10), This is the value of gravitational acceleration; 13.2) Calculate the frictional torque of the strip on the submerged roll, stabilizing roll, and straightening roll respectively. , , , (11), in equation (11), It is the coefficient of friction between the strip and the roll surface.

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