A dual-drive asynchronous rolling mill and its drive method

Abstract

The present application discloses a dual-drive asynchronous rolling mill and a drive method thereof. The asynchronous rolling mill comprises an archway, wherein an upper support roller, an upper working roller, a lower working roller and a lower support roller are vertically arranged in sequence from top to bottom in the archway, and a connecting shaft that rotates synchronously therewith is arranged at one end of the lower working roller, and the upper working roller and the lower working roller act on the top surface and the bottom surface of the rolled piece respectively, and further comprises a steering roller 1 and a steering roller 2 arranged on the left and right sides of the archway, and the steering roller 1 and the steering roller 2 are respectively arranged between the archway and the reel 1, and between the archway and the reel 2, and the steering roller 1 and the steering roller 2 are respectively used for steering the rolled piece. The present invention realizes asynchronous transmission on the same side through dual transmission of support rollers and working rollers, increases the roll changing space on the operating side, and provides a basis for realizing automatic roll changing and improving roll changing efficiency.

Description

Technical Field

[0001] The present application relates to the field of production of ultra-thin precision metal strips, and in particular to a dual-drive asynchronous rolling mill and a drive method thereof. Background Art

[0002] In recent years, with the rapid development of industries such as new energy vehicles, 5G communications, aerospace, and robotics, the market demand for a variety of ultra-thin metal strips has been increasing. Compared with synchronous rolling, the traditional method for producing ultra-thin metal strips, asynchronous rolling can break through the minimum rollable thickness limit of synchronous rolling. It is an alternative technology with strong thinning ability, less intermediate annealing, and high efficiency and low cost for producing a variety of ultra-thin metal strips. The working roll diameter of the ultra-thin strip mill is small. In order to ensure that the speed ratio is accurately controllable and avoid interference between the upper and lower drive shafts, the existing industrial asynchronous rolling mills mostly use two-side working roll transmission. The two-side transmission method requires the operating side of the asynchronous rolling mill to be equipped with a main transmission device, which not only increases safety hazards, but also occupies roll changing space, increases the difficulty of automatic roll changing, and reduces roll changing efficiency, dragging down the improvement of the overall production efficiency of ultra-thin strips. Summary of the invention

[0003] The object of the present invention is to provide a dual-drive asynchronous rolling mill and a drive method thereof, which realizes same-side asynchronous drive through dual drive of support rolls and working rolls, increases roll-changing space on the operating side, and provides a basis for realizing automatic roll changing and improving roll changing efficiency.

[0004] To achieve the above object, the present invention provides the following technical solutions.

[0005] The embodiment of the present application discloses a dual-drive asynchronous rolling mill.

[0006] It includes an archway, in which an upper support roller, an upper working roller, a lower working roller and a lower support roller are vertically arranged in sequence from top to bottom, one end of the lower working roller is provided with a connecting shaft that rotates synchronously therewith, the upper working roller and the lower working roller act on the top surface and the bottom surface of the rolled piece respectively, and also includes a steering roller 1 and a steering roller 2 arranged on the left and right sides of the archway, the steering roller 1 and the steering roller 2 are respectively arranged between the archway and the reel 1, and between the archway and the reel 2, and the steering roller 1 and the steering roller 2 are respectively used for steering the rolled piece,

[0007] It also includes a main motor 1 and a main motor 2. The main motor 1 is decelerated by a reducer 1 and then drives the upper working roll through a coupling 1. The main motor 2 is decelerated by reducers 2 and 3 in sequence and then drives the lower support roll through a coupling 2. The power of the main motor 2 is greater than the power of the main motor 1. The diameter of the coupling 2 is greater than the diameter of the coupling 1. Both the main motor 1 and the main motor 2 are reversible motors that adopt a speed closed-loop control mode and can be controlled separately.

[0008] It also includes a first encoder for measuring the rotation speed of the main motor and a second encoder for measuring the rotation speed of the main motor, an encoder for measuring the rotation speed of the lower working roll, and a first rolling speed encoder for measuring the rotation speed of the steering roll and the second steering roll.

[0009] The upper working roll linear speed Where n 1 is the measured speed of the main motor 1, D 1 J is the diameter of the upper working roll; 1 is the reduction ratio of the reducer 1;

[0010] The linear speed of the lower support roller Where n d is the measured speed of the main motor 2, D d is the diameter of the lower support roller, J d is the reduction ratio J of reducer 2 2 Reduction ratio J with reducer 3 3 The product of d =J 2 J 3 ;

[0011] The lower working roll linear speed Where n 2 is the measured rotation speed of the lower working roll, D 2 is the diameter of the lower working roll;

[0012] The left side speed of the rolled piece Where n L is the measured rotation speed of the steering roller 1; D L is the diameter of the steering roller 1;

[0013] The right side speed of the rolled piece Where n R is the measured rotation speed of the steering roller 2; D R is the diameter of the steering roller 2,

[0014] In the above formula, V 1 、V d 、V 2 、V L 、V R The unit of measurement is m / s, n 1 、n d 、n 2 、n L 、n R The unit of measurement is rpm, D 1 , D d , D 2 , DL , D R The unit of measurement is mm.

[0015] Preferably, in the above-mentioned dual-drive asynchronous rolling mill, the upper support roll and the lower working roll are driven rolls, the upper support roll is driven by the friction force of the upper working roll, and the lower working roll is driven by the friction force applied by the lower support roll and the workpiece.

[0016] Preferably, in the above-mentioned dual-drive asynchronous rolling mill, the reducer one and the reducer two are both planetary reducers, and the reducer three is a hard-toothed cylindrical gear reducer.

[0017] Preferably, in the above-mentioned dual-drive asynchronous rolling mill, the encoder 1 for measuring the main motor speed and the encoder 2 for measuring the main motor speed are respectively installed on the rotor shafts of the main motor 1 and the main motor 2, the encoder for measuring the lower working roll speed is installed on the connecting shaft, and the encoder 1 for measuring the rolling speed and the encoder 2 for measuring the rolling speed are respectively installed on one end of the transmission side of the steering roller 1 and the steering roller 2.

[0018] Correspondingly, a transmission method of a dual-drive asynchronous rolling mill is also disclosed, wherein the upper working roll is used as a reference roll, i.e., a slow-speed roll, and the linear speed of the upper working roll is used as a reference value, and the rotation speed of the main motor 2 is adjusted so that the linear speed value of the lower working roll is always the product of the linear speed of the upper working roll and the actual speed ratio i, i.e., V 2 =iV 1 The specific steps include:

[0019] S1 sets the main transmission parameters, including the upper working roll linear speed setting value V 1s , speed ratio setting value i s , the allowable error value of the lower working roll speed Δn 2 , V 1s The measurement units are m / s, Δn 2 The unit of measurement is rpm;

[0020] S2 calculates the set speed of the main motor 1 n 1s The unit of measurement is rpm;

[0021] S3 calculates the set speed of the lower working roll n 2s The unit of measurement is rpm;

[0022] S4 calculates the set speed of the main motor 2 n ds The unit of measurement is rpm;

[0023] S5 starts, making the measured speed value n of main motor 1 and main motor 2 1 and nd Reach their set speed value n 1s and n ds , n 1 and n d The values ​​are calculated and measured in real time by encoder 1 and encoder 2 for measuring the main motor speed.

[0024] S6 measures the actual speed n of the lower working roll in real time 2 , n 2 The value is calculated by measuring the working roll speed in real time using an encoder;

[0025] S7 real-time comparison of the actual speed value n of the working roll 2 With the set speed value n 2s , adjust the speed of main motor 2,

[0026] If |n 2 -n 2s |>Δn 2 And n 2 >n 2s , then reduce the speed of main motor 2;

[0027] If |n 2 -n 2s |>Δn 2 And n 2 <n 2s , then increase the speed of the main motor 2,

[0028] Until|n 2 -n 2s |≤Δn 2 , that is, the error of the actual speed ratio i is within the allowable range;

[0029] S8 adjusts the upper working roll linear speed setting value V 1s Or speed ratio setting value i s When , steps S2 to S7 are repeated.

[0030] Correspondingly, a transmission method of a dual-drive asynchronous rolling mill is also disclosed, wherein the lower working roll is used as a reference roll, i.e., a slow-speed roll, and the linear speed of the lower working roll is used as a reference value, and the rotation speed of the main motor 2 is adjusted so that the linear speed value of the upper working roll is always the product of the linear speed of the lower working roll and the actual speed ratio i, i.e., V 1 =iV 2 The specific steps include:

[0031] S1 sets the main transmission parameters, including the lower working roll linear speed setting value V 2s , speed ratio setting value i s , the allowable error value of the lower working roll speed Δn 2 , V2s The measurement units are m / s, Δn 2 The unit of measurement is rpm;

[0032] S2 calculates the set speed of the lower working roll n 2s The unit of measurement is rpm;

[0033] S3 calculates the set speed of the main motor 2 n ds The unit of measurement is rpm;

[0034] S4 calculates the set speed of the main motor 1 n 1s The unit of measurement is rpm;

[0035] S5 starts, making the measured speed value n of main motor 1 and main motor 2 1 and n d Reach their set speed value n respectively 1s and n ds , n 1 and n d The values ​​are calculated and measured in real time by encoder 1 and encoder 2 for measuring the main motor speed.

[0036] S6 measures the actual speed n of the lower working roll in real time 2 , n 2 The value is calculated by measuring the working roll speed in real time using an encoder;

[0037] S7 real-time comparison of the actual speed value n of the working roll 2 With the set speed value n 2s , adjust the speed of main motor 2,

[0038] If |n 2 -n 2s |>Δn 2 And n 2 >n 2s , then reduce the speed of main motor 2;

[0039] If |n 2 -n 2s |>Δn 2 And n 2 <n 2s , then increase the speed of main motor 2,

[0040] Until|n 2 -n 2s |≤Δn 2 , that is, the error of the actual speed ratio i is within the allowable range;

[0041] S8 adjusts the setting value V of the working roll linear speed 2s Or speed ratio setting value i s When , steps S2 to S7 are repeated.

[0042] Compared with the prior art, the advantages of the present invention are that the main transmission device of the asynchronous rolling mill is all located on the transmission side of the arch, and the operation side is completely vacant, which leaves enough operating space for the automatic roll change of the asynchronous rolling mill, reduces the difficulty of automatic roll change, improves the roll change efficiency and overall production efficiency, and reduces the safety hazards caused by the transmission device on the operation side. The two active rolls of the transmission method 1 are the upper working roll with a small roll diameter as the slow roll and the lower support roll with a large roll diameter as the fast roll, which is consistent with the characteristics of unbalanced load distribution of the fast and slow rolls of asynchronous rolling. The slow roll has a small load (small transmission torque) corresponding to the upper working roll, and the fast roll has a large load (large transmission torque) corresponding to the lower support roll, which avoids the equipment safety hazards and over-configuration of equipment capacity caused by unbalanced load distribution. Both the main motor 1 and the main motor 2 adopt the speed closed-loop control mode, and the linear speed of the upper working roll and the lower support roll is accurately controllable. The speed of the lower working roll is indirectly controlled by adjusting the speed of the lower support roll motor, which can effectively eliminate the adverse effects of slipping between the lower support roll and the lower working roll on the speed ratio, and ensure the accurate control of the speed ratio. In the second transmission method, the lower working roll is a slow roll and the upper working roll is a fast roll. Combined with the first transmission method, the shape of the rolled piece can be smoothed and the single-sided coil defect of the rolled piece existing in asynchronous rolling can be eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 Shown is a schematic diagram of a dual-drive asynchronous rolling mill in a specific embodiment of the present invention;

[0045] Figure 2 Shown is a schematic front view of a dual-drive asynchronous rolling mill in a specific embodiment of the present invention;

[0046] Figure 3 Shown is a top view schematic diagram of a dual-drive asynchronous rolling mill in a specific embodiment of the present invention.

[0047] In the figure: 1. Archway; 2. Upper support roller; 3. Upper working roller; 4. Lower working roller; 5. Lower support roller; 6. Steering roller 1; 7. Steering roller 2; 8. Rolled product; 9. Coupling 1; 10. Reducer 1; 11. Main motor 1; 12. Encoder 1 for measuring the speed of the main motor; 13. Coupling 2; 14. Reducer 3; 15. Reducer 2; 16. Main motor 2; 17. Encoder 2 for measuring the speed of the main motor; 18. Connecting shaft; 19. Encoder for measuring the speed of the lower working roller; 20. Encoder 1 for measuring the rolling speed; 21. Encoder 2 for measuring the rolling speed. DETAILED DESCRIPTION

[0048] The following will describe the technical solutions in the embodiments of the present invention in detail in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Combination Figure 1-3As shown, a dual-drive asynchronous rolling mill comprises an arch 1, in which an upper support roll 2, an upper working roll 3, a lower working roll 4 and a lower support roll 5 are vertically arranged from top to bottom, one end of the lower working roll 4 is provided with a connecting shaft 18 which rotates synchronously therewith, the upper working roll 3 and the lower working roll 4 act on the top surface and the bottom surface of the rolled piece 8 respectively, and also comprises a steering roll 1 6 and a steering roll 2 7 arranged on the left and right sides of the arch 1, the steering roll 1 6 and the steering roll 2 7 are respectively arranged between the arch 1 and the reel 1, and between the arch 1 and the reel 2, and the steering roll 1 6 and the steering roll 2 7 are respectively used for steering the rolled piece 8.

[0052] It also includes a main motor 11 and a main motor 2 16. The main motor 11 is decelerated by a reducer 10 and then drives the upper working roll 3 through a coupling 9. The main motor 2 16 is decelerated by a reducer 2 15 and a reducer 3 14 in sequence and then drives the lower support roll 5 through a coupling 2 13. The power of the main motor 2 16 is greater than the power of the main motor 11. The diameter of the coupling 2 13 is greater than the diameter of the coupling 1 9. Both the main motor 11 and the main motor 2 16 are reversible motors that adopt a speed closed-loop control mode and can be controlled separately.

[0053] It also includes an encoder 12 for measuring the rotation speed of the main motor 11 and an encoder 2 for measuring the rotation speed of the main motor 16, an encoder 19 for measuring the rotation speed of the lower working roll 4, and an encoder 20 for measuring the rotation speed of the steering roll 16 and the steering roll 27, and an encoder 21 for measuring the rolling speed.

[0054] The upper support roll 2 and the lower working roll 4 are driven rolls. The upper support roll 2 is driven by the friction force of the upper working roll 3, and the lower working roll 4 is driven by the friction force applied by the lower support roll 5 and the rolled piece 8.

[0055] Reducer 1 10 and reducer 2 15 are both planetary reducers, and reducer 3 14 is a hard-toothed cylindrical gear reducer.

[0056] Encoder 12 for measuring the main motor speed and encoder 2 17 for measuring the main motor speed are respectively installed on the rotor shafts of main motor 11 and main motor 2 16, encoder 19 for measuring the lower working roll speed is installed on connecting shaft 18, encoder 1 20 for measuring the rolling speed and encoder 2 21 for measuring the rolling speed are respectively installed on one end of the transmission side of steering roller 1 6 and steering roller 2 7.

[0057] The following will be described in conjunction with a specific embodiment. In the embodiment, the diameters D of the upper and lower working rolls of the rolling mill are 1 and D 2 Both are 100.0mm, the lower support roller diameter D d is 300.0mm, the reduction ratio of reducer 1 is J 1 is 4.0, the reduction ratio J of reducer 2 2is 4.0, the reduction ratio J of reducer 3 3 is 3.0, so J d =J 2 J 3 =4.0×3.0=12.0, the rolled piece is made of 430 stainless steel, the raw material thickness is 80.0μm, and the width is 150.0mm.

[0058] The specific implementation steps of transmission method 1 are as follows:

[0059] Step 1: Take the upper working roll as the reference roll and set the main transmission parameters: the upper working roll linear speed setting value V 1s =1.0m / s, speed ratio setting value i s =1.2, allowable error value of lower working roll speed Δn 2 =0.1rpm.

[0060] Step 2: Insert V 1s , J 1 and D 1 , calculate the main motor set speed n 1s , calculate n 1s =764.3rpm.

[0061] Step 3: Bring in V 1s 、i s and D 1 , calculate the set speed n of the lower working roll 2s , calculate n 2s =229.3rpm.

[0062] Step 4: Bring in V 1s 、i s , D d and J d , calculate the set speed n of the main motor 2 ds , calculate n ds =917.2rpm.

[0063] Step 5: Start the rolling mill and make the measured speed value n of the main motor 1 1 Reach its set speed value n 1s , that is, n 1 =n 1s =764.3rpm, making the measured speed value of the main motor 2 n d Reach its set speed value n ds , that is, n d =n ds =917.2rpm.

[0064] Step 6: Real-time measurement of the actual speed n of the lower working roll 2 .n 2The value is calculated by measuring the working roll speed in real time using an encoder.

[0065] Step 7: Compare the actual speed value n of the working roll in real time 2 With the set speed value n 2s =229.3rpm, adjust the speed of main motor 2.

[0066] If |n 2 -229.3|>0.1rpm and n 2 >229.3rpm, then reduce the speed of main motor 2;

[0067] If |n 2 -229.3|>0.1rpm and n 2 <229.3rpm, then increase the speed of main motor 2.

[0068] Until|n 2 -229.3|≤0.1rpm, that is, the error of the actual speed ratio i is within the allowable range.

[0069] Step 8: When adjusting the rolling speed or speed ratio, adjust the upper working roll linear speed setting value V 1s Or speed ratio setting value i s If the upper working roll linear speed setting value V is increased, 1s , by V 1s =1.0m / s to V 1s =2.0m / s, repeat the above steps 2 to 7, as follows:

[0070] Bring in V 1s , J 1 and D 1 , calculate the set speed n of the main motor 1 1s , calculate n 1s =1528.7rpm.

[0071] Bring in V 1s 、i s and D 1 , calculate the set speed n of the lower working roll 2s , calculate n 2s =458.6rpm.

[0072] Bring in V 1s 、i s , D d and J d , calculate the set speed n of the main motor 2 ds , calculate n ds =1834.4rpm.

[0073] Start the rolling mill and make the measured speed value of the main motor n 1 Reach its set speed value n 1s , that is, n 1 =n 1s =1528.7rpm, making the measured speed value of the main motor 2 n d Reach its set speed value n ds , that is, n d =n ds =1834.4rpm.

[0074] Real-time measurement of the actual speed n of the lower working roll 2 .n 2 The value is calculated by measuring the working roll speed in real time using an encoder.

[0075] Real-time comparison of the actual speed value n of the working roll 2 With the set speed value n 2s =458.6rpm, adjust the speed of main motor 2.

[0076] If |n 2 -458.6|>0.1rpm and n 2 >458.6rpm, then reduce the speed of main motor 2;

[0077] If |n 2 -458.6|>0.1rpm and n 2 <458.6rpm, then increase the speed of main motor 2.

[0078] Until|n 2 -458.6|≤0.1rpm, that is, the error of the actual speed ratio i is within the allowable range.

[0079] Transmission method 2, the specific implementation steps are as follows:

[0080] Step 1: Remove the working roll as the reference roll and set the main transmission parameters: the linear speed setting value V of the lower working roll 2s =1.2m / s, speed ratio setting value i s =1.2, allowable error value of lower working roll speed Δn 2 =0.1rpm.

[0081] Step 2: Insert V 2s and D 2 , calculate the set speed n of the lower working roll 2s , calculate n 2s =229.3rpm.

[0082] Step 3: Bring in V 2s , J d and D d, calculate the set speed n of the main motor 2 ds , calculate n ds =917.2rpm.

[0083] Step 4: Bring in V 2s 、i s , D 1 and J 1 , calculate the set speed n of the main motor 1 1s , calculate n 1s =1100.6rpm.

[0084] Step 5: Start the rolling mill and make the measured speed value n of the main motor 1 1 Reach its set speed value n 1s , that is, n 1 =n 1s =1100.6rpm, making the measured speed value of the main motor 2 n d Reach its set speed value n ds , that is, n d =n ds =917.2rpm.

[0085] Step 6: Real-time measurement of the actual speed n of the lower working roll 2 .n 2 The value is calculated by measuring the working roll speed in real time using an encoder.

[0086] Step 7: Compare the actual speed value n of the working roll in real time 2 With the set speed value n 2s =229.3rpm, adjust the speed of main motor 2.

[0087] If |n 2 -229.3|>0.1rpm and n 2 >229.3rpm, then reduce the speed of main motor 2;

[0088] If |n 2 -229.3|>0.1rpm and n 2 <229.3rpm, then increase the speed of main motor 2.

[0089] Until|n 2 -229.3|≤0.1rpm, that is, the error of the actual speed ratio i is within the allowable range.

[0090] Step 8: When adjusting the rolling speed or speed ratio, adjust the linear speed setting value V of the lower working roll 2s Or speed ratio setting value i s If the speed ratio setting value i is reduced, s , by i s=1.2 down to i s =1.1, repeat the above steps 2 to 7, as follows:

[0091] Bring in V 2s and D 2 , calculate the set speed n of the lower working roll 2s , calculate n 2s =229.3rpm.

[0092] Bring in V 2s , J d and D d , calculate the set speed n of the main motor 2 ds , calculate n ds =917.2rpm.

[0093] Bring in V 2s 、i s , D 1 and J 1 , calculate the set speed n of the main motor 1 1s , calculate n 1s =1008.9rpm.

[0094] Start the rolling mill and make the measured speed value of the main motor n 1 Reach its set speed value n 1s , that is, n 1 =n 1s =1008.9rpm, making the measured speed value of the main motor 2 n d Reach its set speed value n ds , that is, n d =n ds =917.2rpm.

[0095] Real-time measurement of the actual speed n of the lower working roll 2 .n 2 The value is calculated by measuring the working roll speed in real time using an encoder.

[0096] Real-time comparison of the actual speed value n of the working roll 2 With the set speed value n 2s =229.3rpm, adjust the speed of main motor 2.

[0097] If |n 2 -229.3|>0.1rpm and n 2 >229.3rpm, then reduce the speed of main motor 2;

[0098] If |n 2 -229.3|>0.1rpm and n 2 <229.3rpm, then increase the speed of main motor 2.

[0099] Until|n 2 -229.3|≤0.1rpm, that is, the error of the actual speed ratio i is within the allowable range.

[0100] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0101] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A transmission method for a dual-drive asynchronous rolling mill, characterized in that: The double-drive asynchronous rolling mill comprises an archway, in which an upper support roll, an upper working roll, a lower working roll and a lower support roll are vertically arranged in sequence from top to bottom, one end of the lower working roll is provided with a connecting shaft that rotates synchronously therewith, the upper working roll and the lower working roll act on the top surface and the bottom surface of the rolled piece respectively, and also comprises a steering roll 1 and a steering roll 2 arranged on the left and right sides of the archway, the steering roll 1 and the steering roll 2 are respectively arranged between the archway and the reel 1, and between the archway and the reel 2, the steering roll 1 and the steering roll 2 are respectively used for steering the rolled piece, It also includes a main motor 1 and a main motor 2. The main motor 1 is decelerated by a reducer 1 and then drives the upper working roll through a coupling 1. The main motor 2 is decelerated by reducers 2 and 3 in sequence and then drives the lower support roll through a coupling 2. The power of the main motor 2 is greater than the power of the main motor 1. The diameter of the coupling 2 is greater than the diameter of the coupling 1. Both the main motor 1 and the main motor 2 are reversible motors that adopt a speed closed-loop control mode and can be controlled separately. It also includes a first encoder for measuring the rotation speed of the main motor and a second encoder for measuring the rotation speed of the main motor, an encoder for measuring the rotation speed of the lower working roll, and a first rolling speed encoder for measuring the rotation speed of the steering roll and the second steering roll. The upper working roll linear speed , where is the measured speed of the main motor 1, is the diameter of the upper working roll; is the reduction ratio of the reducer 1; The linear speed of the lower support roller , where is the measured speed of the main motor 2, is the diameter of the lower support roller, is the reduction ratio of reducer 2 Reduction ratio with reducer 3 The product of ; The lower working roll linear speed , where is the measured rotation speed of the lower working roll, is the diameter of the lower working roll; The left side speed of the rolled piece , where is the measured rotation speed of the steering roller 1; is the diameter of the steering roller 1; The right side speed of the rolled piece , where is the measured rotation speed of the steering roller 2; is the diameter of the steering roller 2, In the above formula, , , , , The unit of measurement is m / s. , , , , The unit of measurement is rpm, , , , , The unit of measurement is mm. The upper working roll is taken as the reference roll, i.e. the slow roll, and the linear speed of the upper working roll is taken as the reference value. The speed of the main motor 2 is adjusted so that the linear speed value of the lower working roll is always the ratio of the linear speed of the upper working roll to the actual speed difference. The product of The specific steps of the transmission method include: S1 sets the main transmission parameters, including the upper working roll linear speed setting value , speed ratio setting value , Allowable error value of lower working roll speed , The unit of measurement is m / s. The unit of measurement is rpm; S2 calculates the set speed of the main motor 1 , The unit of measurement is rpm; S3 calculates the set speed of the lower working roll , The unit of measurement is rpm; S4 Calculate the set speed of the main motor 2 , The unit of measurement is rpm; S5 starts, making the measured speed values ​​of main motor 1 and main motor 2 and Reach their set speed values ​​respectively and , and The values ​​are calculated and measured in real time by encoder 1 and encoder 2 for measuring the main motor speed. S6 real-time measurement of the actual speed of the lower working roll , The value is calculated by measuring the working roll speed in real time using an encoder; S7 real-time comparison of the actual speed of the working roll With the set speed value , adjust the speed of main motor 2, if and , then reduce the speed of main motor 2; if and , then increase the speed of the main motor 2, Until , that is, the actual speed ratio The error is within the allowable range; S8 adjusts the upper working roll linear speed setting value Or speed ratio setting value When , steps S2 to S7 are repeated.

2. The transmission method of a dual-drive asynchronous rolling mill according to claim 1, characterized in that: The upper support roller and the lower working roller are driven rollers. The upper support roller is driven by the friction force of the upper working roller, and the lower working roller is driven by the friction force applied by the lower support roller and the rolled piece.

3. The transmission method of a dual-drive asynchronous rolling mill according to claim 1, characterized in that: The first reducer and the second reducer are both planetary reducers, and the third reducer is a hard-toothed cylindrical gear reducer.

4. The transmission method of a dual-drive asynchronous rolling mill according to claim 1, characterized in that: The encoder 1 for measuring the main motor speed and the encoder 2 for measuring the main motor speed are respectively installed on the rotor shafts of the main motor 1 and the main motor 2, the encoder for measuring the lower working roll speed is installed on the connecting shaft, and the encoder 1 for measuring the rolling speed and the encoder 2 for measuring the rolling speed are respectively installed on one end of the transmission side of the steering roller 1 and the steering roller 2.

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