A continuous rolling tension control method for a double-stand reversible roughing mill

Abstract

The present invention discloses a continuous rolling tension control method for a double-stand reversible roughing mill, which includes selecting a speed reference roughing mill based on rolling passes; calculating the speed cascade coefficients of other rolling mills; the vertical rolling mill detecting biting and collecting the first rolling force and the first motor torque and calculating the average value in real time; the non-speed reference roughing mill detecting biting and collecting the second rolling force and the second motor torque and calculating the average value in real time, and simultaneously locking the average values of the first rolling force and the first motor torque to enable the tension control between the vertical rolling mill and the non-speed reference roughing mill; the speed reference roughing mill detecting biting and collecting the third rolling force and the third motor torque and calculating the average value in real time, and simultaneously locking the average values of the second rolling force and the second motor torque to enable the tension control between the roughing mills. The method of the present invention is simple to implement, and can achieve the micro-tension control between rolling mills without adding additional hardware, effectively improving the stability of the continuous rolling tension of the double-stand roughing mill.

Description

Technical Field

[0001] The present invention relates to the technical field of metal processing, and in particular to a continuous rolling tension control method for a double-stand reversible roughing mill. Background Art

[0002] A hot strip continuous rolling production line usually consists of a reheating furnace, a roughing mill, a finishing mill, and an underground coiler. Among them, the roughing mill is a reversible mill. After multiple passes of reversible rolling, the slab is rolled into an intermediate slab with a certain thickness, and then sent to the finishing mill for continuous rolling. In order to improve the rolling efficiency of the roughing mill, a tandem roughing mill consisting of two stands of roughing mills is adopted, reducing the number of rolling passes of the roughing mill from 5-7 times to 3 times, thus shortening the rolling time and improving the rolling efficiency.

[0003] During the continuous rolling process of the roughing mill, tensions will be generated between the vertical rolling mill and the roughing mill, and between the roughing mills. In order to ensure the smooth progress of production, the tension between the stands generally adopts a micro-tension control method. Due to factors such as the dynamic speed drop during biting, inaccurate forward and backward slip calculation models, mill slippage, slab thickness change, temperature change, etc., the tension between the stands changes. If the tension is too large, it is easy to cause an increase in the load of the downstream stand mill, damage to mechanical equipment, and at the same time, it may also cause the slab to be pulled narrow, affecting product quality; if the tension is too small, it is easy to cause an increase in the load of the upstream stand mill, and at the same time, it is easy to cause problems such as warping and buckling of the slab, damage to the roller table, and production accidents. Therefore, the constant micro-tension between the stands of the tandem roughing mill is the key to the smooth production of the roughing mill. At present, the micro-tension control between the single-stand roughing mill and the vertical rolling mill calculates the tension deviation through the torque sampling memory method or the torque ratio memory method, and then adjusts the speed of the vertical rolling mill to maintain the constancy of the tension. Since the tandem roughing mill stands are more complex than the single-stand, how to coordinate the micro-tension control between multiple stands is an urgent problem to be solved by the roughing continuous rolling mill unit.

[0004] Therefore, there is a need to improve the continuous rolling tension control method for a double-stand reversible roughing mill in the prior art. Summary of the Invention

[0005] In view of this, the purpose of the embodiments of the present invention is to propose a continuous rolling tension control method for a double-stand reversible roughing mill. The method of the present invention is simple to implement, and can achieve micro-tension control between mills without adding additional hardware, effectively improving the stability of the continuous rolling tension of the double-stand roughing mill.

[0006] Based on the above purpose, the embodiments of the present invention provide a continuous rolling tension control method for a double-stand reversible roughing mill, including the following steps:

[0007] S1. Select a speed reference roughing mill based on the rolling pass.

[0008] S2. Calculate the speed level connection coefficients of the non-speed reference roughing mill and the vertical roll mill;

[0009] S3. After starting rolling, in response to the vertical roll mill detecting the start of biting, collect the first rolling force and the first motor torque and calculate the average value in real time;

[0010] S4. In response to the non-speed reference roughing mill detecting the start of biting, collect the second rolling force and the second motor torque and calculate the average value in real time. At the same time, lock the average value of the first rolling force and the average value of the first motor torque of the vertical roll mill, and dynamically adjust the torque of the vertical roll mill to enable the tension control between the vertical roll mill and the non-speed reference roughing mill;

[0011] S5. In response to the speed reference roughing mill detecting the start of biting, collect the third rolling force and the third motor torque and calculate the average value in real time. At the same time, lock the average value of the second rolling force and the average value of the second motor torque of the non-speed reference roughing mill, and dynamically adjust the speed value of the non-speed reference roughing mill to enable the tension control between the roughing mills.

[0012] In some embodiments, in S2, the calculation formula for the speed level connection coefficient is:

[0013]

[0014] Among them, K R is the speed level connection coefficient of the roughing mill; K E is the speed level connection coefficient of the vertical roll mill; f is the forward slip value of the speed reference roughing mill; f R is the forward slip value of the non-speed reference roughing mill; h is the exit thickness of the speed reference mill; h R is the exit thickness of the non-speed reference mill stand; H is the slab incoming thickness; β is the speed lead coefficient of the vertical roll mill, and the value range of β is 1.1 to 1.8.

[0015] In some embodiments, in S4 and S5, the average values of the rolling force and the motor torque are calculated using the sliding average calculation method, and the calculation formula is:

[0016]

[0017] Among them, is the average value of the rolling force; F i is the rolling force value collected in the i-th cycle; is the average value of the motor torque; M i is the motor torque value collected in the i-th cycle; n is the number of cycles of the collected data; m is the number of terms of the sliding average.

[0018] In some embodiments, the calculation formula for the number of terms m of the sliding average is:

[0019]

[0020] Among them, α is a factor with adjustable number of items, and the value range of α is 0.2 to 0.8; L is the distance between rolling mills; v is the threading speed of the rolling mill; t i is the data acquisition period.

[0021] In some embodiments, in S4, the tension control between the vertical rolling mill and the rough rolling mill adopts a torque adjustment method, and the constant tension is achieved by dynamically adjusting the torque set value of the vertical rolling mill. The tension control torque M E The calculation formula is:

[0022]

[0023] Among them, F E is the actual value of the rolling force of the vertical rolling mill; is the average value of the locked rolling force of the vertical rolling mill; is the average value of the motor torque of the locked vertical rolling mill; T 1 is the tension set value between the vertical rolling mill and the rough rolling mill; D E is the roll diameter of the vertical rolling mill.

[0024] In some embodiments, when the tension control of the vertical rolling mill is not enabled, the motor torque set value of the vertical rolling mill is the rated torque. In response to the enabling of the tension control of the vertical rolling mill, the motor torque set value of the vertical rolling mill is switched to the tension control torque M E .

[0025] In some embodiments, in S5, the tension control between the rough rolling mills adopts a speed adjustment method, and the constant tension is achieved by dynamically adjusting the speed value of the non-speed reference rough rolling mill. The calculation formula for the speed adjustment value Δv is:

[0026] Δv = K p ·ΔT + K i ·ΣΔT

[0027]

[0028] Among them, K P is the proportionality coefficient; K i is the integral coefficient; ΔT is the tension deviation between the rough rolling mills; F R is the actual value of the rolling force of the rough rolling mill; M R is the actual value of the motor torque of the rough rolling mill; is the average value of the locked rolling force of the rough rolling mill; is the average value of the locked motor torque of the rough rolling mill; T 2 is the tension set value between the rough rolling mills; D R is the roll diameter of the rough rolling mill.

[0029] In some embodiments, in S1, the number of rolling passes is three, including odd-numbered passes and even-numbered passes, and the rolling directions of the odd-numbered passes and the even-numbered passes are opposite.

[0030] In some embodiments, based on the number of rolling passes, the speed reference roughing mill is selected as the last roughing mill in the rolling direction.

[0031] In some embodiments, the double-stand reversing roughing mill is connected to a PLC control system. The PLC control system detects whether the mill bites, and collects data on rolling force and motor torque in response to the mill biting.

[0032] The present invention has at least the following beneficial technical effects:

[0033] By selecting the last mill in the rolling direction as the speed reference mill, the present invention ensures the stability of the rolling process speed. At the same time, after the mill bites, the rolling force and motor torque values are collected, and the sliding average calculation method is used to calculate their average values, ensuring that the rolling state can be accurately locked when the head of the slab enters the downstream mill, so as to more accurately calculate the tension value between mills. At the same time, the tension between the vertical mill and the roughing mill is adjusted by torque, avoiding the problem of excessive or too small tension caused by inaccurate speed coupling coefficients, while the tension between the roughing mills is adjusted by speed, which can adjust the tension more quickly, thus ensuring the stability of the tension. This method is simple to implement and can achieve micro-tension control between mills without adding additional hardware, effectively improving the stability of the continuous rolling tension of the double-stand roughing mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments can be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of an embodiment of the equipment layout of the double-stand reversing roughing mill provided by the present invention;

[0036] Figure 2 It is a flowchart of an embodiment of the continuous rolling tension control method for the double-stand reversing roughing mill provided by the present invention;

[0037] Figure 3 It is a schematic diagram of an embodiment of the rolling process provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the following further elaborates on the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0039] For the terms "include" and "have" in the description, claims, and the above-mentioned accompanying drawing description of the present invention, and any variations thereof, are intended to cover non-exclusive inclusion; the terms "first", "second", etc. in the description, claims, or the above-mentioned drawings of the present invention are used to distinguish different objects rather than to describe a specific order. The meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] In the description, claims, and the above-mentioned accompanying drawing description of the present invention, when an element is referred to as being "fixed to", "mounted on", "disposed on", or "connected to" another element, it can be directly or indirectly located on that other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that other element.

[0041] In addition, the mention of "embodiment" in this text means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrence of this phrase at various positions in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0042] As Figure 1 shown in the roughing tandem mill unit, this unit includes a vertical roll mill E1, a roughing mill R1, a roughing mill R2, and a vertical roll mill E2 connected in sequence. When the slab is rolled in odd passes, first, the vertical roll mill E1 and the roughing mill R1 establish tension to form continuous rolling, then the roughing mill R1 and the roughing mill R2 establish tension to form continuous rolling, and the vertical roll mill E2 is opened; when the slab is rolled in even passes, the vertical roll mill E2 and the roughing mill R2 establish tension to form continuous rolling, then the roughing mill R2 and the roughing mill R1 establish tension to form continuous rolling, and the vertical roll mill E1 is opened. The tandem roughing mill stands are relatively complex, and how to coordinate the micro-tension control among multiple stands is an urgent problem to be solved for the roughing tandem mill unit.

[0043] Therefore, as Figure 2 shown, the present invention provides a continuous rolling tension control method for a two-stand reversible roughing mill, including the following steps:

[0044] S1. Select a speed reference roughing mill based on the rolling pass;

[0045] S2. Calculate the speed-level connection coefficients of the non-speed-reference roughing mills and the vertical roll mills;

[0046] S3. After starting rolling, in response to the vertical roll mill detecting the start of biting, collect the first rolling force and the first motor torque and calculate the average value in real time;

[0047] S4. In response to the non-speed-reference roughing mill detecting the start of biting, collect the second rolling force and the second motor torque and calculate the average value in real time. At the same time, lock the average value of the first rolling force and the average value of the first motor torque of the vertical roll mill, dynamically adjust the torque of the vertical roll mill, and enable the tension control between the vertical roll mill and the non-speed-reference roughing mill;

[0048] S5. In response to the speed-reference roughing mill detecting the start of biting, collect the third rolling force and the third motor torque and calculate the average value in real time. At the same time, lock the average value of the second rolling force and the average value of the second motor torque of the non-speed-reference roughing mill, dynamically adjust the speed value of the non-speed-reference roughing mill, and enable the tension control between the roughing mills.

[0049] Furthermore, the first rolling force and the first motor torque are parameters of the vertical roll mill, the second rolling force and the second motor torque are parameters of the non-speed-reference roughing mill, and the third rolling force and the third motor torque are parameters of the speed-reference roughing mill.

[0050] Furthermore, in S1, the number of rolling passes is three, including odd-numbered passes and even-numbered passes, and the rolling directions of the odd-numbered passes and the even-numbered passes are opposite. Based on the current rolling pass, the speed-reference roughing mill is selected as the last roughing mill in the rolling direction.

[0051] Furthermore, in S2, the calculation formula for the speed coupling coefficient is:

[0052]

[0053] where, K R is the speed coupling coefficient of the roughing mill; K E is the speed coupling coefficient of the vertical roll mill; f is the forward slip value of the speed-reference roughing mill; f R is the forward slip value of the non-speed-reference roughing mill; h is the outlet thickness of the speed-reference rolling mill; h R is the outlet thickness of the non-speed-reference rolling mill stand; H is the slab incoming thickness; β is the speed lead coefficient of the vertical roll mill, and the value range of β is 1.1 - 1.8.

[0054] Furthermore, in S3, the double-stand reversible roughing mill is connected to the PLC control system, and the PLC control system detects whether the rolling mill bites, and collects the data of the rolling force and the motor torque in response to the rolling mill biting.

[0055] Furthermore, in S4 and S5, the average values of the rolling force and the motor torque are calculated using the sliding average calculation method, and the calculation formula is:

[0056]

[0057] Among them, is the average rolling force; F i is the rolling force value collected in the i-th cycle; is the average motor torque; M i is the motor torque value collected in the i-th cycle; n is the number of cycles of the collected data; m is the number of terms of the moving average.

[0058] The calculation formula for the number of terms m of the moving average is:

[0059]

[0060] Among them, α is the adjustable factor of the number of terms, and the value range of α is 0.2 to 0.8; L is the distance between rolling mills; v is the threading speed of the rolling mill; t i is the data acquisition cycle.

[0061] Furthermore, in S4, the tension control between the vertical rolling mill and the roughing mill adopts the torque adjustment method, and the constancy of the tension is achieved by dynamically adjusting the torque set value of the vertical rolling mill. The tension control torque M E The calculation formula is:

[0062]

[0063] Among them, F E is the actual rolling force value of the vertical rolling mill; is the average value of the locked rolling force of the vertical rolling mill; is the average value of the locked motor torque of the vertical rolling mill; T 1 is the tension set value between the vertical rolling mill and the roughing mill; D E is the roll diameter of the vertical rolling mill.

[0064] Furthermore, when the tension control of the vertical rolling mill is not enabled, the motor torque set value of the vertical rolling mill is the rated torque. In response to the enabling of the tension control of the vertical rolling mill, the motor torque set value of the vertical rolling mill is switched to the tension control torque M E .

[0065] Furthermore, in S5, the tension control between the roughing mills adopts the speed adjustment method, and the constancy of the tension is achieved by dynamically adjusting the speed value of the non-speed reference roughing mill. The calculation formula for the speed adjustment value Δv is:

[0066] Δv = K p ·ΔT + K i ·ΣΔT

[0067]

[0068] Among them, K P Proportional coefficient; Ki is the integral coefficient; ΔT is the tension deviation between roughing mills; F R is the actual rolling force value of the roughing mill; M R is the actual motor torque value of the roughing mill; is the average value of the locked roughing mill rolling force; is the average value of the locked roughing mill motor torque; T 2 is the set value of the tension between roughing mills; D R is the roll diameter of the roughing mill.

[0069] The following further explains the present invention according to specific embodiments.

[0070] Embodiment 1

[0071] This solution is implemented on the roughing mill unit of a 1450mm hot strip tandem mill in a certain factory. The roughing mill unit includes two vertical roll mills E1 and E2, and two two-high reversible roughing mills R1 and R2. The distance between E1 and R1 is 3100mm, the distance between R1 and R2 is 5740mm, the distance between R2 and E2 is 3100mm, the roll diameters of R1 and R2 are 1170mm, and the roll diameters of E1 and E2 are 850mm. As Figure 3 shown, the roughing mill unit performs three passes of rolling. Taking the rolling process of the first pass as an example, the specific implementation scheme is as follows:

[0072] S1. In the first pass, select R2 as the speed reference mill;

[0073] S2. Calculate the speed coupling coefficients of other mills. The calculation formula is:

[0074]

[0075] where K R is the speed coupling coefficient of the roughing mill; K E is the speed coupling coefficient of the vertical roll mill; f is the forward slip value of the speed reference roughing mill; f R is the forward slip value of the non-speed reference roughing mill; h is the outlet thickness of the speed reference mill; h R is the outlet thickness of the non-speed reference mill stand; H is the slab incoming thickness; β is the vertical roll mill speed lead coefficient, and β takes a value of 1.2.

[0076] S3. When E1 bites, start collecting the first rolling force and the first motor torque, and calculate the average values of the first rolling force and the first motor torque in real time. The calculation formula is:

[0077]

[0078] where is the average value of the rolling force; F i is the rolling force value collected in the i-th cycle; is the average value of the motor torque; M i is the motor torque value collected in the i-th cycle; n is the number of cycles of the collected data; m is the number of terms of the moving average, and the calculation formula of m is:

[0079]

[0080] where α is the adjustable factor of the number of terms, α = 0.4; L is the distance between the rolling mills; v is the threading speed of the rolling mill; t i is the data acquisition cycle.

[0081] S4. When R1 bites in, start collecting the second rolling force and the second motor torque, and calculate the average values of the second rolling force and the second motor torque in real time. The calculation process is the same as E1. At the same time, lock the average values of the rolling force and the motor torque of E1, and enable the tension control between E1 and R1.

[0082] The tension control torque M of E1 E The calculation formula is:

[0083]

[0084] where F E is the actual value of the rolling force of the vertical rolling mill; is the average value of the locked rolling force of the vertical rolling mill; is the average value of the locked motor torque of the vertical rolling mill; T 1 is the tension set value between the vertical rolling mill and the rough rolling mill; D E is the roll diameter of the vertical rolling mill.

[0085] S5. When R2 bites in, lock the average values of the second rolling force and the second motor torque of R1, enable the tension control between R1 and R2, and calculate the speed adjustment value Δv:

[0086] Δv = K p ·ΔT + K i ·∑ΔT

[0087]

[0088] where K P is the proportionality coefficient; K i is the integral coefficient; ΔT is the tension deviation between the rough rolling mills; F R is the actual value of the rolling force of the rough rolling mill; M R is the actual value of the motor torque of the rough rolling mill; is the average value of the locked rolling force of the rough rolling mill; is the average value of the locked motor torque of the rough rolling mill; T 2 is the tension set value between the rough rolling mills; D R is the roll diameter of the rough rolling mill.

[0089] After the rough rolling mill unit of the 1450mm hot strip continuous rolling mill in this factory adopted the above-mentioned continuous rolling tension control method for the double-stand reversible rough rolling mill, it effectively improved problems such as the drastic change in the mill motor current, the narrowing of the slab, and the slipping caused by the tension fluctuation between stands, reduced the impact and damage of the tension fluctuation on the equipment, and the effect was obvious.

[0090] The above are the exemplary embodiments disclosed by the present invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments disclosed by the present invention defined by the claims. The functions, steps, and / or actions of the method claims according to the disclosed embodiments herein do not need to be executed in any specific order. In addition, although the elements disclosed by the embodiments of the present invention can be described or claimed in individual form, they can also be understood as plural unless explicitly limited to the singular.

[0091] It should be understood that, as used herein, unless the context clearly supports an exception, the singular form "a" is also intended to include the plural form. It should also be understood that the "and / or" used herein refers to any and all possible combinations of one or more of the related listed items.

[0092] The serial numbers of the above-disclosed embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0093] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the embodiments disclosed by the present invention (including the claims) is limited to these examples; under the idea of the embodiments of the present invention, the technical features between the above embodiments or different embodiments can also be combined, and there are many other variations in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims

1. A method for controlling the continuous rolling tension of a double-stand reversible roughing mill, characterized in that, it includes: S1. Based on the rolling passes of the roughing continuous rolling mill unit, select the speed reference roughing mill; wherein, the roughing continuous rolling mill unit includes a vertical roll mill E1, a roughing mill R1, a roughing mill R2, and a vertical roll mill E2 connected in sequence; S2. Calculate the speed-level connection coefficients of the non-speed reference roughing mills and the vertical roll mills; S3. After starting rolling, in response to the vertical roll mill detecting the start of biting, collect the first rolling force and the first motor torque and calculate the average value in real time; S4. In response to the non-speed reference roughing mill detecting the start of biting, collect the second rolling force and the second motor torque and calculate the average value in real time, and at the same time lock the average values of the first rolling force and the first motor torque of the vertical roll mill, and dynamically adjust the torque of the vertical roll mill to enable the tension control between the vertical roll mill and the non-speed reference roughing mill; S5. In response to the speed reference roughing mill detecting the start of biting, collect the third rolling force and the third motor torque and calculate the average value in real time, and at the same time lock the average values of the second rolling force and the second motor torque of the non-speed reference roughing mill, and dynamically adjust the speed value of the non-speed reference roughing mill to enable the tension control between the roughing mills; wherein, in S1, the number of rolling passes is three, including odd passes and even passes, and the rolling directions of the odd passes and the even passes are opposite; based on the rolling passes, the speed reference roughing mill is selected as the last roughing mill in the rolling direction.

2. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 1, characterized in that, in S2, the calculation formula for the speed-level connection coefficient is: Among them, K R is the speed - level connection coefficient of the roughing mill; K E is the speed - level connection coefficient of the vertical roll mill; f is the forward slip value of the roughing mill before the speed reference; f R is the forward slip value of the roughing mill before the non - speed reference; h is the thickness at the outlet of the speed - reference mill; h R is the thickness at the outlet of the non - speed - reference rolling stand; H is the thickness of the slab incoming stock; β is the speed - leading coefficient of the vertical roll mill, and the value range of β is 1.1 - 1.

8.

3. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 1, characterized in that, in S4 and S5, the average values of the rolling force and the motor torque are calculated by the sliding average calculation method, and the calculation formula is: Among them, is the average rolling force; F i is the rolling force value collected in the i-th cycle; is the average motor torque; M i is the motor torque value collected in the i-th cycle; n is the number of cycles of the collected data; m is the number of terms of the moving average.

4. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 3, characterized in that, the calculation formula for the number of terms m of the sliding average is: Among them, α is a factor with adjustable number of items, and the value range of α is 0.2 to 0.8; L is the distance between rolling mills; v is the threading speed of the rolling mill; t i is the data acquisition period.

5. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 1, characterized in that, In S4, the tension control between the vertical rolling mill and the non-speed-reference roughing mill adopts a torque adjustment method, and the constancy of the tension is achieved by dynamically adjusting the torque set value of the vertical rolling mill. The tension control torque M E The calculation formula is as follows: Among them, F E is the actual rolling force value of the vertical roll mill; is the locked average rolling force of the vertical roll mill; is the locked average motor torque of the vertical roll mill; T 1 is the tension set value between the vertical roll mill and the non-speed-reference roughing mill; D E is the roll diameter of the vertical roll mill.

6. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 5, characterized in that, When the tension control of the vertical rolling mill is not enabled, the set value of the motor torque of the vertical rolling mill is the rated torque. After the tension control of the vertical rolling mill is enabled, the set value of the motor torque of the vertical rolling mill is switched to the tension control torque M E 。 7. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 1, characterized in that, in S5, the tension control between the roughing mills adopts the speed adjustment method, and the constancy of the tension is realized by dynamically adjusting the speed value of the non-speed reference roughing mill. The calculation formula for the speed adjustment value △v is: △v = K p ·△T + K i ·∑△T Among them, K P Proportionality coefficient; K i is the integral coefficient; △T is the tension deviation between roughing mills; F R is the actual rolling force value of the non-speed-reference roughing mill; M R is the actual motor torque value of the non-speed-reference roughing mill; is the average value of the locked rolling force of the non-speed-reference roughing mill; is the average value of the locked motor torque of the non-speed-reference roughing mill; T 2 is the set value of the tension between roughing mills; D R is the roll diameter of the non-speed-reference roughing mill.

8. The method for controlling the continuous rolling tension of a double-stand reversible roughing mill according to claim 1, characterized in that, the double-stand reversible roughing mill is connected to a PLC control system, and the PLC control system detects whether the rolling mill bites, and collects the data of the rolling force and the motor torque in response to the biting of the rolling mill.

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