A hardness fluctuation compensation system and method for a tandem rolling mill

Abstract

The present invention discloses a compensation system and method for the hardness fluctuation of all stands of a continuous rolling mill. The system includes: a tension calculation module, which is used to obtain the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the continuous rolling mill set, and calculate the actual strip tension value between the stands by combining the weight of the tension measuring roll, the weight of the strip, and the size of the tension meter wrap angle; a tension difference calculation module, which is used to calculate the unit tension difference of the actual strip between the stands by combining the actual strip tension value, the set control tension value, the set thickness and width of the current strip; a compensation amount calculation module, which is used to calculate the speed control compensation amount of the corresponding stand by using the unit tension difference; and a function main control module, which is used to superimpose the speed control compensation amount on the corresponding stand speed control amount to control the tension fluctuation between the stands of the continuous rolling mill set. Through the present invention, the tension fluctuation between the stands caused by the strip hardness fluctuation can be dealt with, thereby realizing the control compensation for the hardness fluctuation.

Description

Technical Field

[0001] The present invention relates to the field of metal processing, and more particularly, to a compensation system and method for hardness fluctuation of all stands of a continuous rolling mill. Background Art

[0002] The iron and steel industry, as one of the pillar industries of a country, always plays an important role in various fields of production and life.

[0003] When ultra-high strength steel is produced by a continuous rolling mill unit, there are many quality indicators for the strip steel, and its thickness accuracy is a very important quality indicator among them, which is directly related to the product quality and economic benefits. Therefore, it is of great significance to ensure the thickness accuracy of the strip steel in production. In actual use, not only is it required that the strip steel product has high dimensional accuracy, but also the uniformity of the thickness over the entire length is required.

[0004] There are various reasons for the thickness deviation of the strip steel. For example, the thickness of the rolled piece, the hardness fluctuation change of the material, etc. will all cause the rolled thickness of the strip steel to change. When the stiffness of the rolling mill is small and the rolling pressure is large, it is easy to have a large mill spring, especially when the hardness of the strip steel fluctuates, it is most likely to cause a large thickness fluctuation of the strip steel. Summary of the Invention

[0005] In order to solve the problem that the product thickness difference fluctuation caused by the hardness fluctuation of the rolled piece exceeds the requirement, the present invention provides a compensation system and method for hardness fluctuation of all stands of a continuous rolling mill, and realizes the control compensation for hardness fluctuation by calculating the tension deviation between the stands of the continuous rolling mill unit and using the speed compensation control method.

[0006] Specifically, the technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention discloses a compensation system for hardness fluctuation of all stands of a continuous rolling mill, including:

[0008] A tension calculation module, configured to obtain the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the continuous rolling mill unit, and calculate the actual strip steel tension value between the stands by combining the weight of the tension measuring roll, the weight of the strip steel, and the size of the tension meter wrap angle;

[0009] A tension difference calculation module, configured to calculate the unit tension difference of the actual strip steel between the stands by combining the actual strip steel tension value calculated by the tension calculation module, the set control tension value, the set thickness and width of the current strip steel;

[0010] A compensation amount calculation module, configured to calculate the speed control compensation amount of the corresponding stand by using the unit tension difference calculated by the tension difference calculation module;

[0011] The function main control module is used to superimpose the calculated speed control compensation amount of the calculation module on the corresponding rack speed control amount, so as to control the tension fluctuation between the stands of the continuous rolling mill.

[0012] In some embodiments, the tension calculation module includes:

[0013] The tensiometer sub-module is used to measure the vertical pressure of the tension measuring roll between the stands of the continuous rolling mill;

[0014] The first acquisition sub-module is used to measure and acquire the weight of the tension measuring roll, the weight of the strip steel, and the size of the tensiometer wrap angle;

[0015] The first calculation sub-module is used to calculate the actual strip steel tension value between the stands:

[0016]

[0017] Where: T is the actual tension value between the stands; FB is the tensiometer feedback value; U is the maximum range of the tensiometer; DIG is the corresponding value of the PLC analog board in the program; W ROLL is the weight of the tension measuring roll; W S is the weight of the strip steel; S1 is the wrap angle on the inlet side of the tensiometer; S2 is the wrap angle on the outlet side of the tensiometer.

[0018] In some embodiments, the tension difference calculation module includes:

[0019] The second acquisition sub-module is used to acquire the actual strip steel tension value calculated by the tension calculation module;

[0020] The control setting sub-module is used to preset the control tension value;

[0021] The second acquisition sub-module is also used to acquire the preset control tension value, and acquire the set thickness and width of the current strip steel;

[0022] The second calculation sub-module is used to calculate the unit tension difference of the actual strip steel between the stands:

[0023]

[0024] Where: T dev is the unit tension difference; T REF is the tension set value; T is the actual tension value between the stands; W is the strip width; H is the strip thickness.

[0025] In some embodiments, the compensation amount calculation module includes:

[0026] The third acquisition sub-module is used to acquire the unit tension difference of the actual strip steel between the stands calculated by the tension difference calculation module;

[0027] A third calculation sub-module, configured to perform proportional control and integral control on the unit tension difference, and superimpose the control quantities generated by the proportional control and the integral control to generate a speed control compensation quantity for a corresponding rack:

[0028] SP = T dev *KP + T dev *KI

[0029] Where: SP is the speed control compensation quantity for the rack; T dev is the unit tension difference; KP is the proportional control coefficient; KI is the integral control coefficient.

[0030] In some embodiments, before the above steps, it further includes:

[0031] A fluctuation monitoring module, configured to monitor the tension fluctuation between the racks of the tandem rolling mill;

[0032] A judgment module, configured to judge whether the tension fluctuation between the racks of the tandem rolling mill exceeds a set control threshold value; if so, execute the full-rack hardness fluctuation compensation method for the tandem rolling mill.

[0033] In a second aspect, the present invention also discloses a full-rack hardness fluctuation compensation method for a tandem rolling mill, including:

[0034] Obtain the vertical pressure of the tension measuring roll feedback by the tension meter between the racks of the tandem rolling mill, and calculate the actual strip tension value between the racks in combination with the tension measuring roll weight, strip weight, and tension meter wrap angle size;

[0035] Calculate the unit tension difference of the actual strip between the racks through the actual strip tension value, in combination with the set control tension value, the set thickness and width of the current strip;

[0036] Use the unit tension difference to calculate the speed control compensation quantity for the corresponding rack;

[0037] Superimpose the speed control compensation quantity calculated by the calculation module on the corresponding rack speed control quantity to control the tension fluctuation between the racks of the tandem rolling mill.

[0038] In some embodiments, the obtaining the vertical pressure of the tension measuring roll feedback by the tension meter between the racks of the tandem rolling mill, and calculating the actual strip tension value between the racks in combination with the tension measuring roll weight, strip weight, and tension meter wrap angle size; includes the following steps:

[0039] Measure the vertical pressure of the tension measuring roll between the racks of the tandem rolling mill by the tension meter;

[0040] Measure and obtain the tension measuring roll weight, strip weight, and tension meter wrap angle size;

[0041] Calculate the actual strip tension value between the racks:

[0042]

[0043] Wherein: T is the actual tension value between stands; FB is the feedback value of the tensiometer; U is the maximum measuring range of the tensiometer; DIG is the corresponding value of the PLC analog input card in the program; W ROLL is the weight of the tension measuring roll; W S is the weight of the strip steel; S1 is the wrap angle on the inlet side of the tensiometer; S2 is the wrap angle on the outlet side of the tensiometer.

[0044] In some embodiments, the unit tension difference of the actual strip steel between stands is calculated by combining the actual tension value of the strip steel, the set control tension value, the set thickness and width of the current strip steel, and includes the following steps:

[0045] Obtain the calculated actual tension value of the strip steel;

[0046] Obtain the pre-set control tension value;

[0047] Obtain the set thickness and width of the current strip steel;

[0048] Calculate the unit tension difference of the actual strip steel between stands:

[0049]

[0050] Wherein: T dev is the unit tension difference; T REF is the tension set value; T is the actual tension value between stands; W is the strip width; H is the strip thickness.

[0051] In some embodiments, using the unit tension difference to calculate the speed control compensation amount of the corresponding stand includes the following steps:

[0052] Obtain the unit tension difference of the actual strip steel between stands;

[0053] Perform proportional control and integral control on the unit tension difference, and superimpose the control quantities generated by the proportional control and integral control to generate the speed control compensation amount of the corresponding stand:

[0054] SP = T dev * KP + T dev * KI

[0055] Wherein: SP is the speed control compensation amount of the stand; T dev is the unit tension difference; KP is the proportional control coefficient; KI is the integral control coefficient.

[0056] In some embodiments, before obtaining the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the continuous rolling mill, the following steps are further included:

[0057] Monitor the tension fluctuation between the stands of the tandem rolling mill;

[0058] Judge whether the tension fluctuation between the stands of the tandem rolling mill exceeds the set control valve threshold; if so, execute the full-stand hardness fluctuation compensation method for the tandem rolling mill

[0059] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0060] 1. When the actual tension fluctuation between the stands exceeds the set control valve threshold, the entire control logic is started, and the calculated maximum output limit of the stand speed control compensation amount is superimposed on the corresponding stand speed control amount to cope with the tension fluctuation between the stands caused by the strip hardness fluctuation, thereby realizing the control compensation for the hardness fluctuation. By adopting the speed compensation control using the tension deviation between the stands, the problem that the thickness difference fluctuation caused by the hardness fluctuation exceeds the product requirements when the tandem rolling mill rolls ultra-high strength steel is solved.

[0061] 2. When the tandem rolling mill produces ultra-high strength steel, by adopting the compensation function intervention time point control and the protective limitation of the output amount, the problem of the vibration of the rolling mill caused by the frequent control due to the increase of the hardness fluctuation frequency after the increase of the rolling mill speed is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present invention in a clear and understandable manner in combination with the drawings in the preferred embodiments.

[0063] Figure 1 It is a structural block diagram of an embodiment of a full-stand hardness fluctuation compensation system for a tandem rolling mill of the present invention;

[0064] Figure 2 It is a structural block diagram of another embodiment of a full-stand hardness fluctuation compensation system for a tandem rolling mill of the present invention;

[0065] Figure 3 It is a structural block diagram of another embodiment of a full-stand hardness fluctuation compensation system for a tandem rolling mill of the present invention;

[0066] Figure 4 It is a schematic diagram of the wrap angle of the tension meter of a full-stand hardness fluctuation compensation system for a tandem rolling mill of the present invention;

[0067] Figure 5 It is a diagram of the thickness difference fluctuation of the product before the compensation function of a full-stand hardness fluctuation compensation system for a tandem rolling mill of the present invention is put into use;

[0068] Figure 6 It is a diagram of the thickness difference fluctuation of the product after the compensation function of a full-stand hardness fluctuation compensation system for a tandem rolling mill of the present invention is put into use;

[0069] Figure 7 This is a flowchart of an embodiment of a method for compensating for hardness fluctuations in all stands of a continuous rolling mill according to the present invention;

[0070] Figure 8 This is a flowchart of another embodiment of a method for compensating for hardness fluctuations in all stands of a continuous rolling mill according to the present invention.

[0071] Explanation of the reference numerals in the drawings:

[0072] The wrap angle S1 on the inlet side of the tensiometer, the wrap angle S2 on the outlet side of the tensiometer, the horizontal line 3, the outlet pinch roll 4, the tension measuring roll 5, the inlet pinch roll 6, the strip steel 7, the center line 8 of the pinch roll, the tensiometer 9. Detailed implementation manners

[0073] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0074] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups.

[0075] To make the drawings concise, only the parts related to the invention are schematically shown in each drawing, and they do not represent the actual structure of the product. Additionally, to make the drawings concise and easy to understand, in some drawings, for components with the same structure or function, only one of them is schematically illustrated, or only one of them is labeled. In this document, "one" not only means "only one" but also means "more than one" situation.

[0076] It should be further understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0077] In this text, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In specific implementations, the terminal devices described in the embodiments of the present application include, but are not limited to, other portable devices such as mobile phones, laptop computers, tutoring machines, or tablet computers having a touch-sensitive surface (e.g., a touch screen display and / or a touchpad). It should also be understood that in some embodiments, the terminal device is not a portable communication device, but a desktop computer having a touch-sensitive surface (e.g., a touch screen display and / or a touchpad).

[0079] In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0080] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying 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 drawings can be obtained according to these drawings, and other embodiments can also be obtained.

[0081] Referring to the attached Figure 1 description, an embodiment of a continuous rolling mill full-stand hardness fluctuation compensation system provided by the present invention includes:

[0082] A tension calculation module 10, configured to obtain the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the continuous rolling mill set, and calculate the actual strip tension value between the stands by combining the weight of the tension measuring roll, the weight of the strip, and the size of the tension meter wrap angle.

[0083] Specifically, tension control is a very important technology for the stability of strip threading, as well as for improving thickness and width accuracy, and for improving flatness and crown.

[0084] This embodiment takes the calculation process of one stand in the continuous rolling mill as an example. The tension compensation calculation of other stands in the continuous rolling mill is similar to this embodiment. The tension measuring roll forms a wrap angle on the strip through the front and rear turning rolls. The component force of the tension on the strip acts on the sensor through the tension measuring roll. The vertical pressure of the tension measuring roll measured by the tension meter between the stands of the continuous rolling mill unit, combined with the gravity of the tension measuring roll, calculates the tension in the strip direction through the angles of S1 and S2, and the calculation result is sent to the tension difference calculation module 20.

[0085] The tension difference calculation module 20 is used to calculate the actual unit tension difference of the strip between the stands by combining the tension value of the actual strip calculated by the tension calculation module, the set control tension value, the set thickness and width of the current strip.

[0086] Specifically, the set control tension value refers to the ideal tension value preset to control the stability of the strip thickness difference fluctuation. It is necessary to obtain the specific values of the strip thickness and width in advance, and then combine the unit tension difference calculation formula to obtain the actual unit tension difference of the strip between the stands. The calculation result is sent to the compensation amount calculation module 30.

[0087] The compensation amount calculation module 30 is used to calculate the speed control compensation amount of the corresponding stand by using the unit tension difference calculated by the tension difference calculation module.

[0088] Specifically, the actual unit tension difference of the strip between the stands calculated by the unit tension difference calculation module is respectively subjected to proportional control and integral control, and the control quantities generated by the proportional control and integral control are superimposed to generate the speed control compensation amount of the corresponding stand. The calculation result is sent to the function main control module 40.

[0089] The function main control module 40 is used to superimpose the speed control compensation amount calculated by the calculation module on the corresponding stand speed control amount to control the tension fluctuation between the stands of the continuous rolling mill unit.

[0090] Specifically, the speed control compensation amount calculated by superimposing the initial stand control speed of the continuous rolling mill unit is used to obtain the compensated stand control speed. Through speed compensation control, the problem that the product thickness difference fluctuation caused by hardness fluctuation exceeds the requirement when rolling ultra-high strength steel in the continuous rolling mill is solved.

[0091] Another embodiment of the full-stand hardness fluctuation compensation system for a continuous rolling mill according to the present invention, on the basis of an embodiment of the above system, the tension calculation module 10 in the above embodiment includes:

[0092] The tensiometer sub-module 11 is used to measure the vertical pressure of the tension measuring roll between the stands of the continuous rolling mill unit.

[0093] The first acquisition sub-module 12 is used to measure and acquire the weight of the tension measuring roll, the weight of the strip, and the size of the wrap angle of the tensiometer.

[0094] The first calculation sub-module 13 is used to calculate the actual strip tension value between stands:

[0095]

[0096] Where: T is the actual tension value between stands; FB is the tension gauge feedback value; U is the maximum range of the tension gauge; DIG is the corresponding value of the PLC analog board in the program; W ROLL is the weight of the tension measuring roll; W S is the weight of the strip; S1 is the wrap angle on the inlet side of the tension gauge; S2 is the wrap angle on the outlet side of the tension gauge.

[0097] Preferably, the tension difference calculation module 20 in the above embodiment includes:

[0098] The second acquisition sub-module 21 is used to acquire the actual strip tension value calculated by the tension calculation module.

[0099] The control setting sub-module 22 is used to preset the control tension value.

[0100] The second acquisition sub-module 21 is further used to acquire the preset control tension value, and acquire the set thickness and width of the current strip.

[0101] The second calculation sub-module 23 is used to calculate the unit tension difference of the actual strip between stands:

[0102]

[0103] Where: T dev is the unit tension difference; T REF is the tension set value; T is the actual tension value between stands; W is the strip width; H is the strip thickness.

[0104] Preferably, on the basis of the compensation amount calculation module 30 in the above embodiment, it includes:

[0105] The third acquisition sub-module 31 is used to acquire the unit tension difference of the actual strip between stands calculated by the tension difference calculation module.

[0106] The third calculation sub-module 32 is used to perform proportional control and integral control on the unit tension difference, and superimpose the control amounts generated by the proportional control and integral control to generate the speed control compensation amount for the corresponding stand:

[0107] SP = T dev *KP + T dev *KI

[0108] Where: SP is the speed control compensation amount for the stand; T devΔT is the unit tension difference; KP is the proportional control coefficient; KI is the integral control coefficient.

[0109] Another embodiment of the full-frame hardness fluctuation compensation system for a continuous rolling mill according to the present invention, as shown in the accompanying Figure 2 description, based on any one of the above system embodiments, further includes:

[0110] A fluctuation monitoring module 50 for monitoring the tension fluctuation between the stands of the continuous rolling mill unit.

[0111] A judgment module 60 for judging whether the tension fluctuation between the stands of the continuous rolling mill unit exceeds a set control valve value. If so, the full-frame hardness fluctuation compensation method for the continuous rolling mill is executed.

[0112] Specifically, when the actual tension fluctuation between the stands exceeds the set control valve value, the entire calculation control logic is started to perform control speed compensation to slow down the tension fluctuation, so as to achieve the purpose of controlling the product thickness difference fluctuation. If it is judged that the tension fluctuation between the stands of the continuous rolling mill unit does not exceed the set control valve value, the state of monitoring the tension fluctuation between the stands of the continuous rolling mill unit is continued to be maintained.

[0113] Another embodiment of the full-frame hardness fluctuation compensation system for a continuous rolling mill provided by the present invention, as shown in the accompanying Figure 3 description, includes:

[0114] A tension calculation module 01 between the stands of the rolling mill, which reads the feedback signal of the tension meter between the stands of the continuous rolling mill unit, and calculates the actual tension value of the strip steel between the stands in combination with factors such as the weight of the tension measuring roll, the weight of the strip steel, and the wrap angle of the tension meter.

[0115]

[0116] T: The actual tension value between the stands;

[0117] FB: The feedback value of the tension meter;

[0118] U: The maximum range of the tension meter;

[0119] DIG: The corresponding value of the PLC analog input board in the program;

[0120] W ROLL : The weight of the tension measuring roll;

[0121] W S : The weight of the strip steel;

[0122] S1: The wrap angle on the inlet side of the tension meter;

[0123] S2: The wrap angle on the outlet side of the tension meter;

[0124] The calculated actual tension value between the stands is sent to the unit tension difference calculation module for use.

[0125] Specifically, the tensiometer wrap angle diagram of the full-stand hardness fluctuation compensation system of the continuous rolling mill is as shown in the attached manual. Figure 4 shown.

[0126] The unit tension difference calculation module 02 calculates the unit tension difference based on the actual total tension of the strip calculated by the inter-rack tension calculation module, the controlled set tension, the set thickness and width of the current strip, and sends it to the rack speed compensation calculation module.

[0127]

[0128] T dev : Unit tension difference;

[0129] T REF : Tension setting value;

[0130] T: actual tension value between racks;

[0131] W: strip width;

[0132] H: strip thickness;

[0133] The rack speed control compensation calculation module 03 uses the unit tension difference of the actual strip between the racks calculated by the unit tension difference calculation module to perform proportional control and integral control respectively, and superimposes the control quantities generated by the proportional control and integral control to generate the speed control compensation quantity of the corresponding rack and send it to the functional main control logic module.

[0134] SP=T dev *KP+T dev *KI

[0135] SP: rack speed control compensation;

[0136] T dev : Unit tension difference;

[0137] KP: proportional control coefficient;

[0138] KI: integral control coefficient;

[0139] Functional main control logic module 04, when the actual tension fluctuation between frames exceeds the set control threshold, starts the entire control logic, and limits the calculated frame speed control compensation to the maximum output and superimposes it on the corresponding frame speed control amount to deal with the tension fluctuation between frames caused by the hardness fluctuation of the strip, thereby achieving control compensation for the hardness fluctuation.

[0140] Specifically, when the continuous rolling mill rolls ultra-high strength steel, the thickness difference fluctuation of the product is caused by the hardness fluctuation. Taking individual stands in the above continuous rolling mill: Stand 1, Stand 5, and Stand 6 as examples. Before the compensation function is put into use, the strip thickness deviation fluctuation at the inlet and outlet of the stands in the continuous rolling mill is as shown in the attached Figure 5 as shown. After the compensation function is put into use, the strip thickness deviation fluctuation at the inlet and outlet of the stands in the continuous rolling mill is as shown in the attached Figure 6 as shown.

[0141] Based on the same technical concept, the present invention also discloses a method for compensating the hardness fluctuation of all stands of a continuous rolling mill. This method can be implemented by using any one of the above embodiments of the system for compensating the hardness fluctuation of all stands of a continuous rolling mill. Specifically, an embodiment of the method for compensating the hardness fluctuation of all stands of a continuous rolling mill in the present application is as shown in the attached Figure 7 as shown, and includes:

[0142] S100, obtaining the vertical pressure of the tension measuring roll feedback by the tension meter between the stands of the continuous rolling mill group, and calculating the actual strip tension value between the stands by combining the weight of the tension measuring roll, the strip weight, and the size of the tension meter wrap angle.

[0143] Specifically, the tension measuring roll forms a wrap angle on the strip through the front and rear turning rolls. The component force of the tension on the strip acts on the sensor through the tension measuring roll. By the vertical pressure of the tension measuring roll measured by the tension meter between the stands of the continuous rolling mill group, combined with the gravity of the tension measuring roll, the tension in the strip direction is calculated through the angles of S1 and S2.

[0144] S200, calculating the actual strip unit tension difference between the stands by combining the actual strip tension value, the set control tension value, the set thickness and width of the current strip.

[0145] Specifically, the set control tension value refers to the ideal tension value set in advance to control the stability of the strip thickness difference fluctuation. It is necessary to obtain the specific values of the strip thickness and width in advance, and then combine the unit tension difference calculation formula to obtain the actual strip unit tension difference between the stands.

[0146] S300, using the unit tension difference to calculate the speed control compensation amount of the corresponding stand.

[0147] Specifically, the actual strip unit tension difference between the stands calculated by the unit tension difference calculation module is respectively subjected to proportional control and integral control, and the control quantities generated by the proportional control and the integral control are superimposed to generate the speed control compensation amount of the corresponding stand.

[0148] S400, superimposing the speed control compensation amount calculated by the calculation module on the corresponding stand speed control amount to control the tension fluctuation between the stands of the continuous rolling mill group.

[0149] Specifically, the speed control compensation amount calculated by superimposing the initial speed of the continuous rolling mill stand is used to obtain the compensated stand control speed. Through speed compensation control, the problem that the product thickness difference fluctuation caused by hardness fluctuation exceeds the requirement when rolling ultra-high strength steel on a continuous rolling mill is solved.

[0150] Another embodiment of a method for compensating hardness fluctuations in all stands of a continuous rolling mill provided by the present invention. In step S100 of the above method embodiment, on the basis of obtaining the vertical pressure of the tension measuring roll feedback by the tension meter between the stands of the continuous rolling mill unit and calculating the actual strip tension value between the stands in combination with the tension measuring roll weight, strip weight and tension meter wrap angle size, the following steps are further included:

[0151] The vertical pressure of the tension measuring roll between the stands of the continuous rolling mill unit is measured by the tension meter.

[0152] Measure and obtain the tension measuring roll weight, strip weight and tension meter wrap angle size.

[0153] Calculate the actual strip tension value between the stands:

[0154]

[0155] Where: T is the actual tension value between the stands; FB is the tension meter feedback value; U is the maximum range of the tension meter; DIG is the corresponding value of the PLC analog input board in the program; W ROLL is the tension measuring roll weight; W S is the strip weight; S1 is the wrap angle on the inlet side of the tension meter; S2 is the wrap angle on the outlet side of the tension meter.

[0156] Preferably, in step S200 of the above method embodiment, on the basis of calculating the unit tension difference of the actual strip between the stands by combining the actual strip tension value, the set control tension value, the set thickness and width of the current strip, the following steps are further included:

[0157] Obtain the calculated actual strip tension value.

[0158] Obtain the preset control tension value.

[0159] Obtain the set thickness and width of the current strip.

[0160] Calculate the unit tension difference of the actual strip between the stands:

[0161]

[0162] Where: T dev is the unit tension difference; T REF is the tension set value; T is the actual tension value between the stands; W is the strip width; H is the strip thickness.

[0163] Preferably, on the basis of calculating the speed control compensation amount of the corresponding rack using the unit tension difference in the above method embodiment S300, the following steps are further included:

[0164] Obtain the unit tension difference of the actual strip steel between the racks.

[0165] Perform proportional control and integral control on the unit tension difference, and superimpose the control amounts generated by the proportional control and the integral control to generate the speed control compensation amount of the corresponding rack:

[0166] SP = T dev *KP + T dev *KI

[0167] Where: SP is the speed control compensation amount of the rack; T dev is the unit tension difference; KP is the proportional control coefficient; KI is the integral control coefficient.

[0168] Another embodiment of a method for compensating for hardness fluctuations in all racks of a continuous rolling mill provided by the present invention, as shown in the accompanying Figure 8 description, on the basis of the above method embodiment, the method for compensating for hardness fluctuations in all racks of a continuous rolling mill further includes:

[0169] S001, monitor the tension fluctuations between the racks of the continuous rolling mill unit.

[0170] S002, determine whether the tension fluctuations between the racks of the continuous rolling mill unit exceed a set control valve threshold. If so, execute the method for compensating for hardness fluctuations in all racks of the continuous rolling mill.

[0171] Specifically, when the actual tension fluctuations between the racks exceed the set control valve threshold, start the entire calculation control logic to perform control speed compensation to slow down the tension fluctuations, so as to achieve the purpose of controlling the product thickness difference fluctuations. If it is determined that the tension fluctuations between the racks of the continuous rolling mill unit do not exceed the set control valve threshold, continue to monitor the tension fluctuation state between the racks of the continuous rolling mill unit.

[0172] The continuous rolling mill all-rack hardness fluctuation compensation system and method of the present invention have the same technical concept, and the technical details of the embodiments of the two can be mutually applicable. To reduce repetition, they will not be elaborated here.

[0173] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general purpose computers, special purpose computers, embedded processors, or other programmable data processing devices to produce a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices generate means for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0174] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including instruction means that implement the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0175] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0176] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn of the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0177] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A hardness fluctuation compensation system for all stands of a continuous rolling mill, characterized in that, Including: A tension calculation module, configured to obtain the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the tandem rolling mill, and calculate the actual strip tension value between the stands by combining the weight of the tension measuring roll, the weight of the strip, and the size of the tension meter wrap angle; A tension difference calculation module, configured to calculate the unit tension difference of the actual strip between the stands by combining the actual strip tension value calculated by the tension calculation module, the set control tension value, the set thickness and width of the current strip; A compensation amount calculation module, configured to calculate the speed control compensation amount of the corresponding stand by using the unit tension difference calculated by the tension difference calculation module; A function main control module, configured to superimpose the speed control compensation amount calculated by the calculation module on the corresponding stand speed control amount, so as to control the tension fluctuation between the stands of the tandem rolling mill; Wherein, the tension calculation module includes: A tension meter sub-module, configured to measure the vertical pressure of the tension measuring roll between the stands of the tandem rolling mill; A first acquisition sub-module, configured to measure and obtain the weight of the tension measuring roll, the weight of the strip, and the size of the tension meter wrap angle; A first calculation sub-module, configured to calculate the actual strip tension value between the stands: ； Where: T is the actual inter-stand tension value; FB is the tension gauge feedback value; U is the maximum range of the tension gauge; DIG is the corresponding value of the PLC analog input card in the program; W ROLL is the weight of the tension measuring roll; W S is the weight of the strip steel; S1 is the wrap angle on the inlet side of the tension gauge; S2 is the wrap angle on the outlet side of the tension gauge; The tension difference calculation module includes: A second acquisition sub-module, configured to obtain the actual strip tension value calculated by the tension calculation module; A control setting sub-module, configured to preset the control tension value; The second acquisition sub-module is further configured to obtain the preset control tension value, and obtain the set thickness and width of the current strip; A second calculation sub-module, configured to calculate the unit tension difference of the actual strip between the stands: ； Where: T dev is the unit tension difference; T REF is the tension set value; T is the actual tension value between stands; W is the strip width; H is the strip thickness.

2. The full-stand hardness fluctuation compensation system for a continuous rolling mill according to claim 1, wherein The compensation amount calculation module includes: A third acquisition sub-module, configured to obtain the unit tension difference of the actual strip between the stands calculated by the tension difference calculation module; A third calculation sub-module, configured to perform proportional control and integral control on the unit tension difference, and superimpose the control amounts generated by the proportional control and integral control to generate the speed control compensation amount of the corresponding stand: ； Where: SP is the compensation amount of the rack speed control; T dev is the unit tension difference; KP is the proportional control coefficient; KI is the integral control coefficient.

3. A hardness fluctuation compensation system for the entire rolling mill stand according to claim 1 or 2, characterized in that, It further includes: A fluctuation monitoring module, configured to monitor the tension fluctuation between the stands of the tandem rolling mill; A judgment module, configured to judge whether the tension fluctuation between the stands of the tandem rolling mill exceeds the set control valve threshold; If so, execute the full stand hardness fluctuation compensation method of the tandem rolling mill.

4. A method for compensating the hardness fluctuation of all stands of a continuous rolling mill, characterized in that, Including the following steps: Obtain the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the tandem rolling mill, and calculate the actual strip tension value between the stands by combining the weight of the tension measuring roll, the weight of the strip, and the size of the tension meter wrap angle; Calculate the unit tension difference of the actual strip between the stands by combining the actual strip tension value, the set control tension value, the set thickness and width of the current strip; Use the unit tension difference to calculate the speed control compensation amount of the corresponding stand; Superimpose the speed control compensation amount calculated by the calculation module on the corresponding stand speed control amount, so as to control the tension fluctuation between the stands of the tandem rolling mill; Wherein, the step of obtaining the vertical pressure of the tension measuring roll fed back by the tension meter between the stands of the tandem rolling mill, and calculating the actual strip tension value between the stands by combining the weight of the tension measuring roll, the weight of the strip, and the size of the tension meter wrap angle; includes the following steps: Measure the vertical pressure of the tension measuring roll between the stands of the tandem rolling mill by the tension meter; Measure and obtain the weight of the tension measuring roll, the weight of the strip steel, and the wrap angle of the tensiometer; Calculate the actual strip steel tension value between stands: ； Where: T is the actual inter-stand tension value; FB is the tension gauge feedback value; U is the maximum range of the tension gauge; DIG is the corresponding value of the PLC analog input card in the program; W ROLL is the weight of the tension measuring roll; W S is the weight of the strip steel; S1 is the wrap angle on the inlet side of the tension gauge; S2 is the wrap angle on the outlet side of the tension gauge; Based on the actual strip steel tension value, combined with the set control tension value, the set thickness and width of the current strip steel, calculate the unit tension difference of the actual strip steel between stands; including the following steps: Obtain the calculated actual strip steel tension value; Obtain the pre-set control tension value; Obtain the set thickness and width of the current strip steel; Calculate the unit tension difference of the actual strip steel between stands: ； Where: T dev is the unit tension difference; T REF is the tension set value; T is the actual tension value between stands; W is the strip width; H is the strip thickness.

5. A method for compensating the hardness fluctuation of all stands of a continuous rolling mill according to claim 4, characterized in that, Use the unit tension difference to calculate the speed control compensation amount for the corresponding stand; including the following steps: Obtain the unit tension difference of the actual strip steel between stands; Perform proportional control and integral control on the unit tension difference, and superimpose the control quantities generated by the proportional control and integral control to generate the speed control compensation amount for the corresponding stand: ； Where: SP is the compensation amount for the frame speed control; T dev is the unit tension difference; KP is the proportional control coefficient; KI is the integral control coefficient.

6. A method for compensating the hardness fluctuation of all stands of a continuous rolling mill according to claim 4 or 5, characterized in that, Before obtaining the vertical pressure of the tension measuring roll feedback between the stands of the continuous rolling mill unit, the following steps are also included: Monitor the tension fluctuation between the stands of the continuous rolling mill unit; Judge whether the tension fluctuation between the stands of the continuous rolling mill unit exceeds the set control valve threshold; if so, execute the full stand hardness fluctuation compensation method for the continuous rolling mill.

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