Alignment roller control method

Abstract

The embodiment of the present invention provides a method for controlling an alignment roller, which relates to the field of steel rolling technology. The method for controlling an alignment roller comprises: S1: calculating the average time t of the moving gear movement 平 ; S2: According to the average time t 平 , calculate the movable time T of the double-length steel in the alignment roller groove 平 ; S3: According to the movable time T 平 Calculate the operating speed V required to align the double-length steel on the alignment roller at the N-1th groove, where N is the number of grooves in the alignment roller. S4: Calculate the motor set frequency △f based on the operating speed V. S5: Control the motor frequency f based on the friction force and the motor set frequency △f to align the double-length steel on the alignment roller. This alignment roller control method can ensure that the double-length steel is aligned in the last one or two grooves of the alignment roller, reducing roller wear and preventing wear on the round steel surface.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling, and in particular to a method for controlling an alignment roller table. Background Art

[0002] In the process of producing round steel, the length cut by the flying shear is transported to the moving teeth via the input roller, and the moving teeth step by step transport the length to the alignment roller, and the alignment roller transports the length to the alignment baffle to align its ends. The alignment roller is manually controlled to start and stop, and the frequency is set to the maximum without adjustment. Usually during production, the roller motor runs for a long time, and the length is aligned between the 3rd and 4th grooves of the alignment roller. There are still 4 to 5 grooves behind, and the length head is against the alignment baffle and is continued to be transported backward by the moving teeth. This not only wastes electricity and accelerates the wear of the roller, but also causes quality problems such as surface wear of the round steel when rolling. Summary of the Invention

[0003] The technical problem to be solved by the embodiment of the present invention is that the alignment roller is started and stopped manually and runs for a long time during production, which will cause waste of electricity, accelerate the wear speed of the roller, and cause wear on the product surface.

[0004] The purpose of the present invention includes providing an alignment roller control method, which can control the alignment of double-length steel in the last 1 to 2 grooves of the alignment roller, slow down the wear speed of the roller, and avoid surface wear of round steel.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The present invention provides a method for controlling an alignment roller table, the method comprising:

[0007] S1: Calculate the average time t of the moving tooth action 平 ;

[0008] S2: According to the average time t 平 , calculate the movable time T of the double-length steel in the alignment roller groove 平 ;

[0009] S3: According to the movable time T 平 , calculate the running speed V required to align the double-length steel in the alignment roller at the N-1th groove, where N is the number of grooves in the alignment roller;

[0010] S4: Calculate the motor set frequency △f according to the running speed V;

[0011] S5: Based on the friction force and the motor set frequency △f, the motor frequency f is controlled to achieve alignment of the double-length steel in the alignment roller.

[0012] In an optional embodiment, S1 includes:

[0013] Get the total length L of the billet 总 , final rolling speed v 末 And the number of multiple lengths X of each billet cut, the average time t of the moving tooth action is obtained 平 .

[0014] In an optional embodiment, in S1, the average time t of the moving tooth action 平 =L 总 / (v 末 *X).

[0015] In an optional embodiment, S2 includes:

[0016] Get the moving time. After the tooth moving action, the time t1 for lifting the double-length steel off the alignment roller and the time t2 for dropping the double-length steel into the next slot are obtained. The movable time T of the double-length steel in the alignment roller slot is obtained. 平 .

[0017] In an optional embodiment, in S2, the movable time T of the double-length steel in the alignment roller groove is 平 =t 平 -X*(t2-t1).

[0018] In an optional embodiment, S3 includes:

[0019] Obtain the number of grooves N of the alignment roller and the distance △L from the left end of the double-length steel to the left end of the cooling bed when the double-length steel is unloaded onto the moving teeth, and obtain the running speed V required to align the double-length steel in the alignment roller at the N-1th groove.

[0020] In an optional embodiment, in S3, the running speed V=ΔL / {(N-1)*T 平}.

[0021] In an optional embodiment, S4 includes:

[0022] Obtain the alignment roller reduction ratio i, the number of motor pole pairs p, and the output roller diameter d, and obtain the motor set frequency △f based on the running speed V.

[0023] In an optional embodiment, in S4, the motor setting frequency △f=△Lip / {7n 电 Πd*(L 总 / (v 末 *X)-X*(t2-t1))}, where i is the reduction ratio of the alignment roller, p is the number of motor pole pairs, d is the output roller diameter, and Π is a constant of 3.14.

[0024] In an optional embodiment, in S5, the motor frequency f=Δf+f 调 , where f 调 It is the manual addition and subtraction frequency value.

[0025] The alignment roller control method provided in this embodiment has the following beneficial effects:

[0026] 1. Through the optimization of control logic, the automatic start and stop control of the alignment roller is realized. In combination with parameters such as the distance between the double-length steel and the bed, the speed of the alignment roller is automatically adjusted during operation, so that the double-length steel is aligned in the last one or two grooves of the alignment roller;

[0027] 2. It can effectively save power loss, reduce production costs and improve economic benefits;

[0028] 3. Reduce the wear on the alignment roller after the double-length steel is aligned;

[0029] 4. Reduce the surface wear of the alignment roller on the double-length steel after the double-length steel is aligned, and improve the surface quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic structural diagram of a round steel tie wire provided in an embodiment of the present invention;

[0032] Figure 2 This is a flow chart of a method for controlling an alignment roller table provided in an embodiment of the present invention.

[0033] Icons: 100-round steel binding wire; 1-rolling wire; 2-first heat inspection; 3-second heat inspection; 4-flying shear; 5-input roller; 6-moving teeth; 7-alignment roller; 8-alignment baffle; 9-left end of cooling bed; 10-double-length steel. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0039] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0040] This embodiment provides a method for controlling an alignment roller, which is applied to round steel wire 100. Figure 1 The round steel binding wire 100 includes a first heat detector 2, a second heat detector 3, a flying shear 4, an input roller 5, a skirt (not marked in the figure), a movable tooth 6, an alignment roller 7, an alignment baffle 8, etc., which are arranged along the direction of the rolling line 1. Among them, the skirt is a device along the roller and is arranged between the input roller 5 and the movable tooth 6. It can be lowered or raised by program control.

[0041] To address the over-running of the alignment roller 7, we first observed the alignment of each steel grade on site. Combined with the parameters such as the bed distance set for each steel grade, we optimized the original program (which started at 50HZ during production and ran continuously) The action cycle of the moving tooth 6 is approximately 5s. After the moving tooth 6 moves, when the double-length steel 10 is about to fall onto the alignment roller 7, the motor starts and runs until the next movement of the moving tooth 6. The double-length steel 10 is lifted off the alignment roller 7 by the driven tooth 6 and stops. The roller running time is approximately 3.5s, and the stop time is approximately 1.5s. The bed distance set for each steel grade on the WINCC screen is automatically adjusted to the speed of the alignment roller 7 by compiling the program, and the distance of the bed distance is adjusted to control the speed of the roller operation. On-site observations show that the bed distance corresponds to a frequency set value, which can align the double-length steel 10 when it is in the last 1 to 2 grooves of the alignment roller 7.

[0042] Therefore, before continuous rolling production, the operator will input parameters such as roller diameter, roller diameter correction coefficient, elongation, rolled piece area, final rolling speed, finished product specifications, and rolling level into the rolling table in the WINCC screen according to the rolling specifications, and calculate the speed of each motor during continuous rolling and the linear speed of the rolling mill. The roller linear speed is obtained by the linear speed of the front frame * the advance coefficient. The bed distance correction value will also be entered to adjust the distance between the rear head of the double-length steel 10 on the cooling bed and the left end 9 of the cooling bed.

[0043] When the first thermal detector 2 has a signal, the length of the first multiple-length steel 10 is calculated according to the speed of the last stand. For example: when the 18# rolling mill produces finished products, the linear speed of the 18# roller is the speed at which the steel runs in the roller table. This speed will be transmitted to the flying shear 4. When the first thermal detector 2 has a signal, the written program calculates the length of the steel. The length minus the distance L1 from the first thermal detector 2 to the flying shear 4 is the set length of the first multiple-length steel, that is, the calculated length - L1 = the set length of the first multiple-length steel, and the calculated length of the subsequent multiple-length steel = the set length of the Nth multiple-length steel. When there is no signal from the first thermal detector 2 and a signal from the second thermal detector 3, it is considered to be the last multiple-length steel. If the last multiple-length steel is detected, the last multiple-length steel will not be sheared.

[0044] The tail length is also aligned. After the tail length is detected, the normal length steel 10 is controlled by the shearing signal of the flying shear 4 to unload the skirt steel, and the tail length is controlled by the falling edge signal of the second thermal detection 3 to unload the skirt steel.

[0045] The correction value for the distance between the double-length steel 10 and the cooling bed (the distance △L between the left end of the double-length steel 10 and the left end of the cooling bed when the double-length steel 10 is unloaded onto the movable tooth 6) is set by the main operator in WinCC. This value is added to the distance between the flying shear 4 and the left end 9 of the cooling bed to reversely calculate the skirt board's movement time. The skirt board movement time refers to the time it takes for the skirt board to receive the steel at the low position, rise to the middle position, and then rise to the high position. During normal production, the movable tooth 6 will only move once (one cycle) for each double-length steel 10. For each double-length steel 10, the skirt board will perform these movements, then push the steel onto the movable tooth 6, causing the movable tooth 6 to step forward once. The next time a double-length steel 10 arrives, the movable tooth 6 will step forward again.

[0046] Among them, △L is the value set by the main operator, but due to different length settings (the length setting should consider 1: minimizing steel consumption when cold shearing to a fixed length, 2: minimizing cold shearing time), friction and other factors, the △L of each length is slightly different (uneven) when actually laying the steel. The movable tooth 6 moves the same each time (the speed-time curve of the movable tooth 6 is the same, and the interval between the two curves is different. The difference is related to the length of the length setting). During each movement, the movable rack lifts the length steel 10, moves forward one step and drops the length steel 10 onto the fixed tooth. When it reaches the alignment roller 7, the movable rack lifts the length steel 10, moves forward one step and drops it onto the roller in the first groove of the alignment roller 7. The roller carries the length steel 10 toward the alignment baffle 8. While the length steel 10 is carried by the movable tooth 6 to the subsequent groove, it is also carried by the alignment roller to the alignment baffle 8.

[0047] For details, please refer to Figure 2 , the alignment roller control method includes the following steps:

[0048] S1: Calculate the average time t of the movable gear 6 平 .

[0049] Specifically, obtain the total length L of the billet 总 , final rolling speed v 末 And the number of multiple lengths X of each billet cut, the average time t of the moving tooth 6 is obtained 平 .

[0050] When the production of each specification is stable, the multiple length setting is basically unchanged, and the number of multiple lengths of each billet is also known. If 1 billet is cut to X multiple lengths, then the total time t=L for each billet to be unloaded onto the movable tooth 6 总 / v 末 , where L 总 It is the total length of the steel billet in multiples, which can be calculated in the program. 总 The difference is not big, so it can be considered as the same. 末 It is the final rolling speed, that is, the linear speed of the finished product rolling mill.

[0051] Average time t of the moving gear 6 平 =L 总 / (v 末 *X).

[0052] S2: According to the average time t 平 , calculate the movable time T of the double-length steel 10 in the groove of the alignment roller 7 平 .

[0053] Specifically, the time t1 of the movable tooth 6 after the movable tooth 6 moves to lift the double-length steel 10 away from the alignment roller 7 and the time t2 of the double-length steel 10 falling to the next groove are obtained to obtain the movable time T of the double-length steel 10 in the groove of the alignment roller 7. 平 .

[0054] The movable time T of the double-length steel 10 in the groove of the alignment roller 7 平 =t 平 -X*(t2-t1), where t1 is the time it takes for the movable tooth 6 to lift the double-length steel 10 off the alignment roller 7, and t2 is the time it takes for the double-length steel 10 to fall into the next slot. t1 and t2 are determined based on the speed curve of the movable tooth 6 (which can be monitored on the IBA) and on-site measurements.

[0055] S3: According to the movable time T 平 , calculate the running speed V required to align the double-length steel 10 in the alignment roller 7 at the N-1th groove, where N is the number of grooves of the alignment roller 7.

[0056] Specifically, the number of grooves N of the alignment roller 7 and the distance ΔL between the left end of the double-length steel 10 and the left end of the cooling bed when the double-length steel 10 is unloaded onto the movable teeth 6 are obtained, and the running speed V required to achieve alignment of the double-length steel 10 in the alignment roller 7 at the N-1th groove is obtained.

[0057] For example, the alignment roller 7 has a total of 8 grooves. Assuming that the alignment is completed at the 7th groove, the moving distance of the double-length steel 10 in each groove is △L / 7, that is, the running speed of the double-length steel 10 in the alignment roller 7 is V=△L / (7*T 平 ), that is, V=△L / {(N-1)*T 平}.

[0058] S4: Calculate the motor set frequency △f according to the running speed V;

[0059] Specifically, the reduction ratio i of the alignment roller 7, the number of motor pole pairs p, and the output roller diameter d are obtained, and the motor setting frequency Δf is obtained according to the running speed V.

[0060] According to the formula v=Πdn 辊, where v is the roller linear velocity, i.e. the running speed V of the double-length steel 10 in the alignment roller 7, d is the roller diameter, π is a constant 3.14, n 辊 is the roller speed.

[0061] n 电 =i*n 辊 , where i is the reduction ratio of the alignment roller 7, n 电 is the roller motor speed.

[0062] n 电 =60f / p, where f is the frequency and p is the number of motor pole pairs.

[0063] It can be obtained that the set frequency △f=△Lip / {7n 电 Πd*(L 总 / (v 末 *X)-X*(t2-t1))}, where △L is the main operating setting value, i is the reduction ratio of the alignment roller 7, p is the number of motor pole pairs, d is the output roller diameter, and Π is a constant of 3.14.

[0064] S5: Based on the friction force and the motor set frequency Δf, the motor frequency f is controlled to achieve alignment of the double-length steel 10 in the alignment roller 7.

[0065] Specifically, considering the influence of friction on △L, make a manual addition and subtraction button frequency on the WINCC screen, and the final frequency transmitted from the alignment roller to the inverter is: f=△f+f 调 , where f 调 It is the manual addition and subtraction frequency value.

[0066] The alignment roller control method provided in this embodiment has the following beneficial effects:

[0067] 1. Through the optimization of control logic, the automatic start and stop control of the alignment roller 7 is realized. In combination with parameters such as the distance between the double-length steel 10 and the bed, the speed of the alignment roller is automatically adjusted during operation, so that the double-length steel 10 is aligned in the last 1 to 2 grooves of the alignment roller 7;

[0068] 2. It can effectively save power loss, reduce production costs and improve economic benefits;

[0069] 3. Reduce the wear on the alignment roller after the double-length steel 10 is aligned;

[0070] 4. Reduce the surface wear of the double-length steel 10 by the alignment roller 7 after the double-length steel 10 is aligned, and improve the surface quality of the product.

[0071] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for controlling an alignment roller, characterized in that: The alignment roller table control method comprises: S1: Calculate the average time t of the moving tooth (6) 平 ; S2: According to the average time t 平 , calculate the movable time T of the double-length steel (10) in the groove of the alignment roller (7) 平 ; S3: According to the movable time T 平 , calculate the running speed V required to achieve alignment of the double-length steel (10) in the alignment roller (7) at the N-1th groove, where N is the number of grooves of the alignment roller (7); S4: Calculate the motor set frequency △f according to the running speed V; S5: Based on the friction force and the motor set frequency △f, the motor frequency f is controlled to achieve alignment of the double-length steel (10) in the alignment roller (7).

2. The method for controlling an alignment roller table according to claim 1, wherein: S1 includes: Get the total length L of the billet 总 , final rolling speed v 末 And the number of multiple lengths X of each billet cut, the average time t of the moving tooth (6) is obtained 平 .

3. The method for controlling an alignment roller table according to claim 2, wherein: In S1, the average time t of the moving tooth (6) is 平 =L 总 / (v 末 *X).

4. The method for controlling the alignment roller table according to claim 2, wherein S2 include: Obtain the time of the moving tooth (6). After the moving tooth (6) moves, the time t1 of lifting the double-length steel (10) off the alignment roller (7) and the time t2 of dropping the double-length steel (10) into the next slot are obtained, and the movable time T of the double-length steel (10) in the slot of the alignment roller (7) is obtained. 平 .

5. The method for controlling an alignment roller table according to claim 4, wherein: In S2, the movable time T of the double-length steel (10) in the groove of the alignment roller (7) is 平 =t 平 -X*(t2-t1).

6. The method for controlling an alignment roller table according to claim 4, wherein S3 include: The number of grooves N of the alignment roller (7) and the distance △L between the left end of the double-length steel (10) and the left end (9) of the cooling bed when the double-length steel (10) is unloaded onto the movable teeth (6) are obtained, and the running speed V required to achieve alignment of the double-length steel (10) in the alignment roller (7) at the N-1th groove is obtained.

7. The method for controlling an alignment roller table according to claim 6, wherein: In S3, the running speed V=△L / {(N-1)*T 平 }.

8. The method for controlling an alignment roller table according to claim 6, wherein S4 include: Obtain the reduction ratio i of the alignment roller (7), the number of motor pole pairs p, and the output roller diameter d, and obtain the motor setting frequency △f based on the running speed V.

9. The method for controlling an alignment roller table according to claim 8, wherein: In S4, the motor setting frequency △f=△Lip / {7n 电 Πd*(L 总 / (v 末 *X)-X*(t2-t1))}, where i is the reduction ratio of the alignment roller (7), p is the number of motor pole pairs, d is the output roller diameter, and Π is a constant of 3.

14.

10. The method for controlling an alignment roller table according to claim 1, wherein: In S5, the motor frequency f=△f+f 调 , where f 调 It is the manual addition and subtraction frequency value.

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