Single-stand belt breakage detection method

Abstract

The invention discloses a single-stand belt breakage detection method. The method comprises the steps that the actual torque TQ rolling of a single-stand rolling mill, the actual linear speed V in of an inlet coiling machine and the actual linear speed V out of an outlet coiling machine are continuously collected; on the basis of continuously collected TQ rolling, V entering and V exiting, the variable quantities delta TQ rolling T, delta V entering T and delta V exiting T of the actual torque TQ rolling, the actual linear speed V entering of the inlet coiling machine and the actual linear speed V exiting of the outlet coiling machine in the time T are calculated; an inlet belt breakage torque change judgment value delta TQ-in, an outlet belt breakage torque change judgment value delta TQ-out, an inlet coiler linear speed change judgment value delta V-in and an outlet coiler linear speed change judgment value delta V-out are obtained in real time; and based on the comparison results of the delta TQ rolling T, the delta V in T and the delta V out T and the delta TQ in, the delta V in, the delta TQ out and the delta V out, judging whether the strip is broken or not and judging the strip breaking position.

Description

Technical Field

[0001] The present invention relates to a detection method, in particular to a belt break detection method. Background Art

[0002] For single-stand reversing rolling mills, the most common problem during the rolling process is strip breakage. Once a strip breakage occurs, the mill roll gap must be opened as quickly as possible and the unit must be stopped. Therefore, rapid and accurate detection of strip breakage is extremely important.

[0003] For single-stand reversing mills equipped with tension meters on both sides of the mill, the actual strip tension measured by the tension meters can be used to quickly determine if a strip break has occurred. However, for single-stand reversing mills without tension meters, indirect determination of strip breakage is required based on changes in the mill's torque and current, the coiler's speed, and the coiler's torque and current.

[0004] Single-stand reversible rolling mills without tension meters currently typically determine whether a strip is broken based on the absolute change in a single value, such as the mill's torque current, the inlet and outlet coiler speeds, and the torque current. Currently, the delay in strip break detection for single-stand reversible rolling mills equipped with tension meters is less than 0.1 seconds, while the delay for single-stand reversible rolling mills without tension meters varies between 0.2 and 2 seconds, with a high false positive rate. This indicates that single-stand strip break detection without tension meters suffers from a longer delay and higher false positive rate compared to detection using tension meters, significantly impacting production. Summary of the Invention

[0005] The present invention aims to provide a single-stand belt break detection method that uses a multivariate combination to determine whether a single-stand rolling mill has a belt break. This method also features a short delay time and a low false positive rate, significantly contributing to increased production speed.

[0006] In order to achieve the above object, the present invention provides a single-rack belt break detection method, comprising the steps of:

[0007] Continuously collect the actual torque TQ of the single-stand rolling mill 轧 , Actual linear speed of the entrance coiler V 入 , and the actual linear speed V of the outlet coiler 出 ;

[0008] Based on the actual torque TQ acquired continuously 轧 , Actual linear speed of the entrance coiler V 入 , and the actual linear speed V of the outlet coiler to calculate the actual torque TQ 轧 , Actual linear speed of the entrance coiler V 入, the actual linear speed Vout of the outlet coiler and the change ΔTQ in time T 轧T , ΔV 入T , ΔV 出T ;

[0009] Real-time acquisition of the inlet belt break torque change judgment value ΔTQ 入 , Output broken belt torque change judgment value ΔTQ 出 , the entry coiler linear speed change judgment value ΔV 入 and the exit coiler linear speed change judgment value ΔV 出 ;

[0010] Based on the change in actual torque within time T ΔTQ 轧T , the change in the actual linear speed of the entrance coiler within time TΔV 入T , the change in the actual linear speed of the outlet coiler within time TΔV 出T and the entry belt-breaking torque change judgment value ΔTQ 入 , Determination value of linear speed change of entrance coiler Δ V入 , Output broken belt torque change judgment value ΔT Q出 and the exit coiler linear speed change judgment value ΔV 出 The comparison results are used to determine whether a belt break occurs and the location of the break.

[0011] Furthermore, in the single-frame belt break detection method of the present invention, the inlet belt break torque change judgment value ΔTQ is obtained in real time based on the following formula: 入 :ΔTQ 入 =-T 入 / k1, where T 入 represents the inlet tension setting value, k1 represents the first determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 15-25.

[0012] Furthermore, in the single-frame belt break detection method of the present invention, the inlet belt break torque change judgment value ΔTQ is obtained in real time based on the following formula: 出 :ΔTQ 出 =T 出 / k2, where T 出 represents the inlet tension setting value, k2 represents the second determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 15-25.

[0013] Furthermore, in the single-rack belt break detection method of the present invention, ΔV is obtained in real time based on the following formula: 入：

[0014]

[0015] Among them D 入 Indicates the actual coil diameter of the entrance coiler, T 入 Indicates the inlet tension setting value, Gr indicates the gear ratio, GD 2 入 represents the moment of inertia of the entrance coiler, T represents the time length, and k3 represents the third determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 0.5-1.

[0016] Furthermore, in the single-rack belt break detection method of the present invention, ΔV is obtained in real time based on the following formula: 出 :

[0017]

[0018] Among them D 出 Indicates the actual coil diameter of the export coiler, T 出 Indicates the outlet tension setting value, Gr indicates the gear ratio, GD 2 出 represents the moment of inertia of the exit coiler, T represents the time length, and k4 represents the fourth determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 0.5-1.

[0019] Furthermore, in the single-rack belt break detection method of the present invention, determining whether a belt break occurs and the belt break location specifically includes the following steps:

[0020] When at least one of the following conditions is met, it is determined that a belt break has occurred:

[0021] (ΔV 入T <ΔV 入 ) and (ΔTQ 轧T <ΔTQ 入 );

[0022] (ΔV 出T >ΔV 出 ) and (ΔTQ 轧T >ΔTQ 出 );

[0023] (ΔV 入T <ΔV 入 ) and (ΔV 出T >ΔV 入 ).

[0024] Furthermore, in the single-rack belt break detection method of the present invention, when (ΔV 入T <ΔV 入) and (ΔTQ 轧T <ΔTQ 入 ), it is determined that a belt break occurs at the entrance.

[0025] Furthermore, in the single-rack belt break detection method of the present invention, when (ΔV 出T >ΔV 出 ) and (ΔTQ 轧T >ΔTQ 出 ), it is determined that the belt is broken at the outlet.

[0026] Furthermore, in the single-rack belt break detection method of the present invention, (ΔV 入T <ΔV 入 ) and (ΔV 出T >ΔV 入 ), it is determined that a belt break has occurred in the middle.

[0027] The single-rack belt break detection method of the present invention has the following advantages and beneficial effects compared to the prior art:

[0028] The single-stand belt break detection method described in the present invention determines whether a single-stand rolling mill has a belt break by combining multiple variables. This method also reduces the delay time and false positive rate of belt break detection, significantly helping to increase production speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The single-stand strip break detection method of the present invention is shown in one embodiment for a single-stand rolling mill unit.

[0030] Figure 2 A flowchart showing the steps of a single-rack belt break detection method according to one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0031] The single-rack belt break detection method of the present invention will be further explained and illustrated below in conjunction with specific embodiments and the accompanying drawings. However, such explanation and illustration do not constitute an undue limitation to the technical solution of the present invention.

[0032] Figure 1 A single-stand rolling mill train is shown by way of example.

[0033] like Figure 1 As shown, the single-stand rolling mill mainly comprises a rolling mill 1, and an exit coiler 2 and an entry coiler 3 located on either side thereof, wherein P represents the rolling direction. The single-stand rolling mill adopts a reciprocating rolling method to thin the strip.

[0034] The most common abnormality in the rolling process is strip breakage. Once a strip breakage occurs, the mill roll gap needs to be opened as soon as possible and the unit needs to be stopped. To this end, the present invention provides a single-stand strip breakage detection method in some embodiments.

[0035] Figure 2 The present invention is a flowchart of the steps of the single-rack belt break detection method in one embodiment.

[0036] like Figure 2 As shown, in some embodiments, the single-rack belt break detection method of the present invention includes the steps of:

[0037] (A) Continuously collect the actual torque TQ of a single-stand rolling mill 轧 , Actual linear speed of the entrance coiler V 入 , and the actual linear speed V of the outlet coiler 出 , where the actual torque TQ 轧 The unit is 10 -1 %, Actual linear speed of the entrance coiler V 入 The unit is 10 -1 mpm, actual linear speed of the outlet coiler V 出 The unit is 10 -1 mpm;

[0038] (B) Calculate the actual torque TQ 轧 , Actual linear speed of the entrance coiler V 入 , Actual linear speed of the exit coiler V 出 The change ΔTQ in time T 轧T , ΔV 入T , ΔV 出T , where the change in the actual torque of the rolling mill within T is ΔTQ 轧T The unit is 10 -1 %, the change of the actual linear speed of the entrance coiler within the time TΔV 入T The unit is 10 -1 mpm, the change in the actual linear speed of the outlet coiler within the time T ΔV 出T The unit is 10 -1 mpm:

[0039] (C) Real-time acquisition of the entrance belt break torque change judgment value ΔTQ 入 :ΔTQ 入 =T 入 / k1, where ΔTQ 入 The unit is 10 -1 %;T 入represents the inlet tension setting value, and its unit is 10KG; k1 represents the first determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 15-25.

[0040] Get the exit broken belt torque change judgment value ΔTQ in real time 出 :ΔTQ 出 =T 出 / k2, where ΔTQ 出 The unit is 10 -1 %;T 出 represents the inlet tension setting value, and its unit is 10KG; k2 represents the second determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 15-25.

[0041] Real-time acquisition of the entry coiler linear speed change judgment value ΔV 入 :

[0042]

[0043] where ΔV 入 The unit is 10 -1 mpm;D 入 Indicates the actual coil diameter of the entrance coiler, the unit is 10 -1 mm; T 入 Indicates the inlet tension setting value, its unit is 10KG; Gr represents the gear ratio, which is dimensionless, GD 2 入 represents the moment of inertia of the entrance coiler, and its unit is kg.m; T represents the time length, and its unit is s; k3 represents the third determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 0.5-1.

[0044] Real-time acquisition of the exit coiler linear speed change judgment value ΔV 出 :

[0045]

[0046] where ΔV 出 The unit is 10 -1 mpm;D 出 Indicates the actual coil diameter of the export coiler, the unit is 10 -1 mm; T 出 Indicates the outlet tension setting value, its unit is 10KG; Gr represents the gear ratio, which is dimensionless, GD 2 出represents the moment of inertia of the exit coiler, and its unit is kg.m; T represents the time length, and its unit is s; k4 represents the fourth determination coefficient, which can be obtained by fitting the historical empirical data of each parameter in the above formula. In some embodiments, its value range can be 0.5-1.

[0047] (D) Based on the change in actual torque within time T, ΔTQ 轧T , the change in the actual linear speed of the entrance coiler within time TΔV 入T , the change in the actual linear speed of the outlet coiler within time TΔV 出T and the entry belt-breaking torque change judgment value ΔTQ 入 , the entry coiler linear speed change judgment value ΔV 入 , Output broken belt torque change judgment value ΔTQ 出 and the exit coiler linear speed change judgment value ΔV 出 The comparison results are used to determine whether a belt break occurs and the location of the break.

[0048] When at least one of the following conditions is met, it is determined that a belt break has occurred:

[0049] When (ΔV 入T <ΔV 入 ) and (ΔTQ 轧T <ΔTQ 入 ), it is determined that a belt break occurs at the entrance.

[0050] When (ΔV 出T >ΔV 出 ) and (ΔTQ 轧T >ΔTQ 出 ), it is determined that the belt is broken at the outlet.

[0051] When (ΔV 入T <ΔV 入 ) and (ΔV 出T >ΔV 入 ), it is determined that a belt break has occurred in the middle.

[0052] In order to better illustrate the specific application of the single-rack belt break detection method of the present invention, the present invention will be verified through a specific example below.

[0053] Examples

[0054] In a specific example, based on the actual torque TQ of a single-stand rolling mill continuously collected within 0.1s (ie, T=0.1s), 轧 , Actual linear speed of the entrance coiler V 入 , and the actual linear speed V of the outlet coiler 出 Get the change of the actual torque of the rolling mill in T ΔTQ轧T =54.15, the change in the actual linear speed of the inlet coiler within the time T ΔV 入T =29.01, the change in the actual linear speed of the outlet coiler within the time TΔV 出T =35.06.

[0055] Real-time acquisition of the inlet belt break torque change judgment value ΔTQ 入 :ΔTQ 入 =-T 入 / k1=-33. Where T 入 =677, k1=20.5.

[0056] Get the exit broken belt torque change judgment value ΔTQ in real time 出 :ΔTQ 出 =T 出 / k2=33, where T 出 =736, k2=22.3.

[0057] Real-time acquisition of the entry coiler linear speed change judgment value ΔV 入 :

[0058]

[0059] Among them D 入 =16891,T 入 =677, Gr=1, GD 2 入 =2949, T=0.1s; k3=0.706, ΔV 入 =-52.

[0060] Real-time acquisition of the exit coiler linear speed change judgment value ΔV 出 :

[0061]

[0062] Among them D 出 =8119, T 出 =736, Gr=1, GD 2 出 =2092, T=0.1s; k4=0.882, ΔV 出 =23.

[0063] Based on the above-obtained example, the actual torque variation ΔTQ within time T 轧T , the change in the actual linear speed of the entrance coiler within time TΔV 入T , the change in the actual linear speed of the outlet coiler within time TΔV 出T and the entry belt-breaking torque change judgment value ΔTQ 入, the entry coiler linear speed change judgment value ΔV 入 , Output broken belt torque change judgment value ΔTQ 出 and the exit coiler linear speed change judgment value ΔV 出 , it can be seen that (ΔV 出T >ΔV 出 ) and (ΔTQ 轧T >ΔTQ 出 ), it is determined that the belt is broken at the outlet.

[0064] It should be noted that the above embodiments are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith that can be directly derived from or easily associated with the contents disclosed by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A single-frame belt break detection method, characterized in that: Including steps: Continuously collect the actual torque TQ of the single-stand rolling mill 轧 , Actual linear speed of the entrance coiler V 入 , and the actual linear speed V of the outlet coiler 出 ; Based on the actual torque TQ acquired continuously 轧 , Actual linear speed of the entrance coiler V 入 , and the actual linear speed V of the outlet coiler 出 Calculate the actual torque TQ 轧 , Actual linear speed of the entrance coiler V 入 , Actual linear speed of the exit coiler V 出 The change ΔTQ in time T 轧T , ΔV 入T , ΔV 出T ; Real-time acquisition of the inlet belt break torque change judgment value ΔTQ 入 , Output broken belt torque change judgment value ΔTQ 出 , the entry coiler linear speed change judgment value ΔV 入 and the exit coiler linear speed change judgment value ΔV 出 ; Based on the change ΔTQ of the actual torque within time T 轧T , the change in the actual linear speed of the entrance coiler within time TΔV 入T , the change in the actual linear speed of the outlet coiler within time TΔV 出T and the entry belt-breaking torque change judgment value ΔTQ 入 , the entry coiler linear speed change judgment value ΔV 入 , Output broken belt torque change judgment value ΔTQ 出 and the exit coiler linear speed change judgment value ΔV 出 The comparison results are used to determine whether a belt break occurs and the location of the break.

2. The single-frame belt break detection method according to claim 1, characterized in that: The inlet belt break torque change judgment value ΔTQ is obtained in real time based on the following formula 入 :ΔTQ 入 =T 入 / k1, where T 入 represents the inlet tension setting value, and k1 represents the first determination coefficient.

3. The single-frame belt break detection method according to claim 1, wherein: The exit belt break torque change judgment value ΔTQ is obtained in real time based on the following formula 出 :ΔTQ 出 =T 出 / k2, where T 出 represents the outlet tension setting value, and k2 represents the second determination coefficient.

4. The single-frame belt break detection method according to claim 1, wherein: Get ΔV in real time based on the following formula 入 : Among them D 入 Indicates the actual coil diameter of the entrance coiler, T 入 Indicates the inlet tension setting value, Gr indicates the gear ratio, GD 2 入 represents the moment of inertia of the entrance coiler, T represents the time length, and k3 represents the third determination coefficient.

5. The single-frame belt break detection method according to claim 1, wherein: Get ΔV in real time based on the following formula: Among them D 出 Indicates the actual coil diameter of the export coiler, T 出 Indicates the outlet tension setting value, Gr indicates the gear ratio, GD 2 出 represents the moment of inertia of the exit coiler, T represents the time length, and k4 represents the fourth determination coefficient.

6. The single-frame belt break detection method according to claim 1, wherein: Determining whether a belt break occurs and the location of the belt break specifically includes the following steps: determining that a belt break occurs when at least one of the following conditions is met: (ΔV 入T <ΔV 入 ) and (ΔTQ 轧T <ΔTQ 入 ); (ΔV 出T >ΔV 出 ) and (ΔTQ 轧T >ΔTQ 出 ); (ΔV 入T <ΔV 入 ) and (ΔV 出T >ΔV 入 ).

7. The single-frame belt break detection method according to claim 6, characterized in that: When (ΔV 入T <ΔV 入 ) and (ΔTQ 轧T <ΔTQ 入 ), it is determined that a belt break occurs at the entrance.

8. The single-frame belt break detection method according to claim 6, wherein: When (ΔV 出T >ΔV 出 ) and (ΔTQ 轧T >ΔTQ 出 ), it is determined that the belt is broken at the outlet.

9. The single-frame belt break detection method according to claim 6, wherein: When (ΔV 入T <ΔV 入 ) and (ΔV 出T >ΔV 入 ), it is determined that a belt break has occurred in the middle.

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