A method and device for reducing the speed of hot-rolled ribbed steel bars without intervals

Abstract

An embodiment of the present invention provides a method and device for reducing the speed of hot-rolled ribbed steel bars without intervals. When the detection device detects the tail of the current billet, a delay is started; when the delay reaches the specified delay time and the specified rolling mill has a rolling current, the specified rolling mill is triggered to reduce the speed of the next billet of the current billet.

Description

Technical Field

[0001] The present invention relates to the technical field of ribbed steel bar rolling, and particularly to a method and device for non-stop speed reduction of hot-rolled ribbed steel bars. Background Art

[0002] The non-stop rolling technology is an advanced technology in the production process of bars and wires. Its main function is to realize that the head of the next billet bites into the tail of the previous billet and enters the 1# rolling mill during the production process of bars and wires, and then decelerates and separates between the 1# rolling mill and the 2# rolling mill to avoid "flying steel" caused by the untimely response of other equipment during the subsequent rolling process. The non-stop technology can maximize the rolling rhythm and increase the output. However, the traditional non-stop rolling technology has a great disadvantage that it can only realize the speed reduction between billets of fixed length (11.5m - 11.7m). With the continuous improvement of the production requirements of bars and wires, the traditional non-stop rolling technology can no longer meet the current production requirements, especially in the direct rolling process, a large number of non-fixed-length billets (8 - 11.7m) appear to ensure the direct rolling temperature.

[0003] In the process of implementing the present invention, the applicant found that there are at least the following problems in the prior art:

[0004] The problem that the traditional non-stop rolling technology cannot achieve non-stop speed reduction for non-fixed-length billets during continuous production. Summary of the Invention

[0005] Embodiments of the present invention provide a method and device for non-stop speed reduction of hot-rolled ribbed steel bars, which is also a new method and device for non-stop speed reduction of hot-rolled ribbed steel bars (billets), and solves the problem that the traditional non-stop rolling technology cannot achieve non-stop speed reduction for billets with dynamically changing sizes during continuous production.

[0006] To achieve the above object, on the one hand, embodiments of the present invention provide a method for non-stop speed reduction of hot-rolled ribbed steel bars, including:

[0007] Detecting whether the tail of the current billet reaches a specified detection position;

[0008] When it is detected that the tail of the current billet reaches the specified detection position, starting a delay;

[0009] When the delay reaches a specified delay time and the specified rolling mill has rolling current, triggering the specified rolling mill to decelerate from a first speed to a second speed so as to decelerate the next billet of the current billet;

[0010] Wherein, the specified detection position is set on the billet movement path on the inlet side of the specified rolling mill and at a first distance from the specified rolling mill; the first distance is the minimum length of the billet; the first speed is greater than the second speed.

[0011] Further, it further includes:

[0012] When the specified rolling mill runs at the second speed for a specified duration, the specified rolling mill is restored to the first speed.

[0013] Further, the specified delay time is obtained according to the following formula: T = (D + r × L) ÷ V

[0014] Where: T represents the specified delay time, in seconds; D represents the first distance, in meters; L represents the distance between the specified rolling mill and the next rolling mill, in meters; r represents the proportionality factor for determining the position of the separation point of adjacent billets; V represents the first speed of the specified rolling mill, in meters per second.

[0015] Further, detecting whether the tail of the current billet reaches the specified detection position includes:

[0016] Detecting whether the tail of the current billet reaches the specified detection position by receiving the signal of the thermal detection device;

[0017] Wherein, the thermal detection device is arranged between the heating furnace and the specified rolling mill and at the first distance from the specified rolling mill; the thermal detection device is used to detect the tail of the billet;

[0018] The specified rolling mill is the first rolling mill after the heating furnace.

[0019] Further, r is 0.5.

[0020] Further, D is 6 meters and L is 1.4 meters.

[0021] On the other hand, an embodiment of the present invention provides a device for reducing the speed of hot-rolled ribbed steel bars without intervals, including:

[0022] A tail detection unit for detecting whether the tail of the current billet reaches the specified detection position;

[0023] A delay unit for starting a delay when it is detected that the tail of the current billet reaches the specified detection position;

[0024] A speed reduction unit for triggering the specified rolling mill to reduce the speed from the first speed to the second speed when the delay reaches the specified delay time and the specified rolling mill has rolling current, so as to reduce the speed of the next billet of the current billet;

[0025] Wherein, the specified detection position is arranged on the billet movement path on the inlet side of the specified rolling mill and at the first distance from the specified rolling mill; the first distance is the minimum length of the billet; the first speed is greater than the second speed.

[0026] Further, the device further includes a speed recovery unit configured to restore the specified rolling mill to the first speed when the specified rolling mill runs at the second speed for a specified duration.

[0027] Further, the specified delay time is obtained according to the following formula: T = (D + r × L) ÷ V

[0028] Where: T represents the specified delay time, in seconds; D represents the first distance, in meters; L represents the distance between the specified rolling mill and the next rolling mill, in meters; r represents a proportionality factor for determining the position of the separation point of adjacent billets; V represents the first speed of the specified rolling mill, in meters per second.

[0029] Further, the tail detection unit is specifically configured to detect whether the tail of the current billet reaches a specified detection position by receiving a signal from a thermal detection device;

[0030] Wherein, the thermal detection device is arranged between the heating furnace and the specified rolling mill and is at the first distance from the specified rolling mill; the thermal detection device is used to detect the tail of the billet; the specified rolling mill is the first rolling mill after the heating furnace.

[0031] Further, r is 0.5.

[0032] Further, D is 6 meters and L is 1.4 meters.

[0033] The above technical solution has the following beneficial effects: When the detection device detects the tail of the current billet, a delay is started; when the delay reaches the specified delay time and the specified rolling mill has a rolling current, the specified rolling mill is triggered to reduce the speed of the next billet of the current billet, realizing that the same hot rolling production line can adapt to non-fixed-length billets of various types for non-stop speed reduction rolling; for the same hot rolling production line, without adjusting the software and hardware parameters related to non-stop speed reduction, for example, without moving the position of the detection device and without adjusting the specified delay time, it is possible to produce billets of any length within the range from the specified minimum length billet to the maximum length billet, and in a single continuous production, the billets can be of the same length or of different lengths that vary. Thus, it breaks through the limitation that the traditional non-stop speed reduction function can only be used for billets of a specified fixed length, bringing great convenience to production. Description of the Drawings

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

[0035] Figure 1 It is a flowchart of a method for continuously reducing the speed of hot-rolled ribbed steel bars according to one of the embodiments of the present invention.

[0036] Figure 2 It is a schematic diagram showing the biting of the head of the next billet onto the tail of the previous billet into the No. 1 rolling mill during the continuous speed reduction process of the prior art.

[0037] Figure 3 It is a schematic diagram showing the realization of continuous speed reduction for the next billet during the continuous speed reduction process of the prior art.

[0038] Figure 4 It is a schematic diagram showing the moment when the tail of the current billet leaves the hot inspection device according to one of the embodiments of the present invention.

[0039] Figure 5 It is a schematic diagram showing the biting of the head of the next billet onto the tail of the previous billet into the No. 1 rolling mill according to one of the embodiments of the present invention.

[0040] Figure 6 It is a schematic diagram showing the completion of speed reduction for the next billet according to one of the embodiments of the present invention.

[0041] Figure 7 It is a structural diagram of a device for continuously reducing the speed of hot-rolled ribbed steel bars according to one of the embodiments of the present invention.

[0042] The reference signs are shown as:

[0043] 1: Heating furnace;

[0044] 2: Run-out table roller;

[0045] 3: Roller in front of the mill;

[0046] 4: Hot inspection device;

[0047] 5: Next billet;

[0048] 6: Previous billet;

[0049] H1: No. 1 rolling mill;

[0050] V2: No. 2 rolling mill. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] Regarding the problem that the traditional non-stop rolling technology cannot achieve non-stop speed reduction for non-standard billets during continuous production, the inventor analyzed the traditional non-stop speed reduction logic as follows:

[0053] The traditional non-stop speed reduction conditions are: (1) the hot detection signal at a position 11.5 meters away from the No. 1 rolling mill disappears; (2) the No. 1 rolling mill has rolling current; when both of the above conditions are met, the non-stop speed reduction condition is triggered, and then the No. 1 rolling mill reduces the speed of the next billet, so that the next billet is separated from the previous billet (i.e., the current billet) by a certain distance to ensure the stability of the subsequent rolling process. The logic is as follows: Figure 2 and Figure 3 As shown, the billet comes out of the heating furnace 1, passes through the discharging ground rolls 2, and reaches the front-stand ground rolls 3. A hot detection device 4 is arranged at a position D away from the No. 1 rolling mill H1 (roughing horizontal rolling mill) in front of the No. 1 rolling mill H1, where D can be 11.5 meters. A No. 2 rolling mill V2 (roughing vertical rolling mill) is arranged behind the No. 1 rolling mill H1; when the billet is heated in the heating furnace 1 and then passes through the discharging ground rolls 2 and reaches the front-stand ground rolls 3, a hot detection device 4 is arranged at a position D away from the No. 1 rolling mill H1 at this time. As Figure 2 shown, when the head of the next billet 5 is less than the position D away from the No. 1 rolling mill H1, the head abuts against the tail of the previous billet 6 (i.e., the current billet) and bites into the No. 1 rolling mill H1. As Figure 3 shown, after the No. 1 rolling mill H1 rolls for a certain distance (at this time, the No. 1 rolling mill H1 has rolling current), when the tail of the next billet 5 leaves the hot detection of the hot detection device 4, the hot detection signal disappears at this time, and then the No. 1 rolling mill H1 reduces the speed, and the next billet 5 is separated from the previous billet 6 by a certain distance.

[0054] The inventor found that the traditional non-stop speed reduction has certain limiting conditions. When billets shorter than D meters are transported head-to-tail by the top roll in front of the machine, the following situation will occur: when the tail of the next billet leaves the hot detection device, at this time, the tail of the previous billet has not left the No. 1 rolling mill and the head of the next billet has not been bitten into the No. 1 rolling mill. (Since it is head-to-tail biting into the No. 1 rolling mill, the No. 1 rolling mill has rolling current), then the No. 1 rolling mill reduces its speed, causing the tail of the previous billet to be under tension, and the distance between the two billets cannot be increased. As a result, "flying steel" will occur due to the untimely response of other equipment during the subsequent rolling process. Therefore, the traditional non-stop speed reduction function can only be used normally when the billet length is D or basically D. For example, when D is 11.5 meters, the traditional non-stop speed reduction function can only be used normally when the billet length is 11.5 - 11.7 meters (due to the length limitation of the heating furnace, the maximum billet length is 11.7m).

[0055] Based on the above analysis, in order to solve the problem that the traditional non-stop rolling technology cannot achieve non-stop speed reduction for non-fixed-length billets during continuous production, on the one hand, as Figure 1 shown, an embodiment of the present invention provides a method for non-stop speed reduction of hot-rolled ribbed steel bars, including:

[0056] Step S100, detecting whether the tail of the current billet reaches a specified detection position;

[0057] Step S101, when it is detected that the tail of the current billet reaches the specified detection position, start a delay;

[0058] Step S102, when the delay reaches a specified delay time and the specified rolling mill has rolling current, trigger the specified rolling mill to reduce its speed from a first speed to a second speed, so as to reduce the speed of the next billet of the current billet;

[0059] Wherein, the specified detection position is set on the billet movement path on the inlet side of the specified rolling mill, and is at a first distance from the specified rolling mill; the first distance is the minimum length of the billet; the first speed is greater than the second speed.

[0060] In some embodiments, traditional non-gap speed reduction can only process billets of a fixed length with the same size, and the first distance must be set to the length of the fixed-length billet. In the technical solution of the present invention, the first distance is set to the minimum length of the non-fixed-length billets that may appear in production. For example, on the same production line, the possible billet lengths are between 6 and 11.7 meters, then the first distance can be set to 6 meters. At the first distance before the designated rolling mill used to achieve non-gap speed reduction, the tail of the current billet can be identified and detected through manual observation or by setting a detection device. For example, when the tail of the billet is manually observed to reach the designated detection position, a signal can be manually sent, or the detection device is used to identify the tail of the billet passing through the detection device and send a signal; after receiving this signal, the system implemented based on this embodiment considers that the tail of the current billet has reached the designated detection position. In some embodiments, the designated rolling mill is Rolling Mill No. 1, which is the first rolling mill that the billet enters after coming out of the heating furnace. Preferably, Rolling Mill No. 1 is a roughing horizontal rolling mill, and the next rolling mill after Rolling Mill No. 1 is Rolling Mill No. 2. Preferably, Rolling Mill No. 2 is a roughing vertical rolling mill. The basis for determining the designated delay time is that when the delay reaches the designated delay time, the head of the current billet passing through the designated rolling mill is at a certain position between the designated rolling mill and the next rolling mill. For example, if the distance between the designated rolling mill and the next rolling mill is L, a suitable designated delay time can be set such that when the delay reaches the designated delay time, the head of the billet is between the designated rolling mill and the next rolling mill and is at a distance of L / 2, or L / 3, or L / 4, etc. from the designated rolling mill. Preferably, the head of the current billet passing through the designated rolling mill is at the midpoint between the designated rolling mill and the next rolling mill. The specific value of the designated delay time can be calculated based on the deployment of the on-site production line in combination with the moving speed of the billet, or because the production conditions are relatively stable, so it can also be obtained by conducting actual tests and statistically averaging the delay times measured multiple times as the designated delay time. More methods for determining the value of the designated delay time will not be listed here. The specific method for determining the value of the designated delay time is not a limitation on the protection scope of this embodiment.

[0061] The conditions for non-gap speed reduction in the technical solution of the present invention are: 1. The designated rolling mill has rolling current; 2. When the tail of the previous billet leaves the thermal detection device (used as the detection device), a delay is started, and when the delay reaches the designated delay time, the designated rolling mill is triggered to reduce speed.

[0062] The following is an explanation based on Figure 4 、 5 and 6.

[0063] As Figure 4As shown, when the length of the billet is 6 - 11 meters, such as 6 meters, 6.5 meters, 7 meters, 7.5 meters, 8 meters, 8.5 meters, 9 meters, 9.5 meters, 10 meters, 10.5 meters, 11 meters, when the tail of the previous billet 6 (i.e., the current billet) leaves the hot inspection device 4, a delay is started for timing at this time. There are many specific timing methods, such as including but not limited to hot inspection timing, software or hardware timer timing, etc. As Figure 5 shown, when the tail of the previous billet 6 is between the positions of the hot inspection device and the No. 1 rolling mill H1, the head of the next billet 5 abuts against the tail of the previous billet 6 and bites into the No. 1 rolling mill H1, as Figure 6 shown, and then the No. 1 rolling mill H1 is triggered to decelerate after a specified delay time, and the next billet 5 and the previous billet 6 are separated by a certain distance.

[0064] For another example, assume Figure 4 、 5 and the distance between the No. 1 rolling mill and the No. 2 rolling mill in 6 is 1.4 meters, and the first distance is set to 6 meters; by setting the specified delay time, the deceleration position of the billet is set to the middle position between the specified rolling mill and the next rolling mill. Then the total distance from the detection device to this middle position is 6 + 1.4÷2 = 6.7 meters. Dividing this 6.7 meters by the linear speed of the specified rolling mill (i.e., the first speed) can determine the specified delay time. This specified delay time ensures that when this specified delay time arrives, the head of the next billet abuts against the tail of the previous billet and just moves to the middle position described above in this example. At this time, the head of the next billet exceeds the specified rolling mill by about 0.7 meters, and the length of the next billet is 8 meters. When the tail of the previous billet leaves the detection device, the delay starts. When the specified delay time arrives, the head of the next billet (i.e., 8 meters long) reaches this middle position, and the rear part of the next billet is still under the specified rolling mill. At this time, the specified rolling mill decelerates to the second speed, resulting in the deceleration of the next billet, and the next billet and the previous billet are separated at the middle position described above in this example. Among them, the first speed and the second speed can be the linear speeds of the specified rolling mill.

[0065] The technical solution of the present invention has the following technical effects: When the detection device detects the tail of the billet, a time delay is started; when the time delay reaches the specified time delay and the specified rolling mill has a rolling current, the specified rolling mill is triggered to decelerate, realizing that the same hot rolling production line can adapt to non-fixed-length billets of various types for non-stop decelerating rolling; for the same hot rolling production line, without adjusting the software and hardware parameters related to non-stop decelerating, for example, without moving the position of the detection device and without adjusting the specified time delay, it is possible to produce billets of any length within the range from the specified minimum length billet to the maximum length billet, and in a single continuous production, the billets can be of the same length or of varying different lengths. Thus, it breaks through the limitation that the traditional non-stop decelerating function can only be used for billets of a specified fixed length, bringing great convenience to production.

[0066] Further, it further includes:

[0067] When the specified rolling mill runs at the second speed for a specified duration, the specified rolling mill is restored to the first speed.

[0068] Illustrated with a specific embodiment as follows: Taking the hot rolled ribbed steel bar with a diameter of 25 mm as an example, the normal rolling linear speed of the No. 1 rolling mill for 25 ribbed bars (equivalent to the specified rolling mill) is 0.376 m / s (equivalent to the first speed). When the deceleration condition is triggered, the speed limit of the No. 1 rolling mill is reduced by 50%, and the speed is 0.188 m / s (equivalent to the second speed). The deceleration time (equivalent to the specified duration) can be set according to the process requirements of the on-site production line. In this example, preferably, it is set to 2.2 s. After 2.2 s, it resumes the normal rolling speed (equivalent to the first speed), and so on.

[0069] Further, the specified time delay is obtained according to the following formula: T = (D + r×L)÷V

[0070] Where: T represents the specified time delay, in seconds; D represents the first distance, in meters; L represents the distance between the specified rolling mill and the next rolling mill, in meters; r represents the proportionality factor for determining the separation point position of adjacent billets, and the value of r×L must be less than D; V represents the first speed of the specified rolling mill, in meters per second.

[0071] In some embodiments, the basis for determining the specified delay time is that when the delay reaches the specified delay time, the head of the current billet passing through the specified rolling mill is at a certain position between the specified rolling mill and the next rolling mill. For example, if the distance between the specified rolling mill and the next rolling mill is L, an appropriate specified delay time can be set such that when the delay reaches the specified delay time, the head of the billet is between the specified rolling mill and the next rolling mill and is at a distance of L / 2, or L / 3, or L / 4, etc. from the specified rolling mill. For example, the first distance is 6 meters, and the distance between the specified rolling mill (such as the No. 1 rolling mill H1 in Figure 4 and the next rolling mill (such as the No. 2 rolling mill V2 in Figure 4 is 1.4 meters. If it is desired that the head of the next billet is at the middle of the distance between the specified rolling mill and the next rolling mill when no-gap speed reduction occurs, then r is set to 0.5. Then the specified delay time T = (D + r×L)÷V = (6 + 0.5×1.4)÷V; V represents the first speed of the specified rolling mill.

[0072] The embodiments of the present invention have the following technical effects: It provides a specific method for determining the specified delay time for the no-gap speed reduction scheme, which facilitates technicians to determine the optimal specified delay time according to the specific on-site conditions, improves the technical indicators of the production line, and enhances production efficiency and quality.

[0073] Further, detecting whether the tail of the current billet reaches the specified detection position includes:

[0074] Detecting whether the tail of the current billet reaches the specified detection position by receiving the signal of the thermal detection device;

[0075] Wherein, the thermal detection device is arranged between the heating furnace and the specified rolling mill and is at a distance of the first distance from the specified rolling mill; the thermal detection device is used to detect the tail of the billet;

[0076] The specified rolling mill is the first rolling mill after the heating furnace.

[0077] In some embodiments, by detecting the tail of the billet through the thermal detection method, while significantly improving the functions of the existing production line, the equipment on the existing production line is fully utilized, and the implementation cost of this technical solution is reduced.

[0078] Further, r is 0.5.

[0079] In some embodiments, preferably, the no-gap speed reduction is set to occur when the head of the next billet is at the middle of the distance between the specified rolling mill and the next rolling mill. At this time, the head of the next billet is at the same distance from the front and rear rolling mills. After the speed reduction, a safe distance can be maintained between the head of the next billet and the tail of the previous billet.

[0080] Further, D is 6 meters and L is 1.4 meters.

[0081] In some embodiments, when the first distance is set to 6 meters, the minimum length of the non-fixed-length billets that can be produced by the hot rolling production line is 6 meters. When the maximum length of the non-fixed-length billets that can be produced by the hot rolling production line is 11.7 meters, the hot rolling production line can be used to produce non-fixed-length billets in the range of 6 meters to 11.7 meters.

[0082] The embodiments of the present invention have the following technical effects: realizing the speed reduction of the non-fixed-length billets with lengths of 6 - 11.7 m when they cross-head and tail bite into the specified rolling mill, breaking through the limitation of the traditional non-spacing speed reduction function (the billet length is 11.5 - 11.7 m), and bringing great convenience to production.

[0083] On the other hand, as Figure 7 shown, the embodiments of the present invention provide a non-spacing speed reduction device for hot rolled ribbed steel bars, including:

[0084] A tail detection unit 700, configured to detect whether the tail of the current billet reaches a specified detection position;

[0085] A delay unit 701, configured to start a delay when it is detected that the tail of the current billet reaches the specified detection position;

[0086] A speed reduction unit 702, configured to trigger the specified rolling mill to reduce its speed from a first speed to a second speed when the delay reaches a specified delay time and the specified rolling mill has a rolling current, so as to reduce the speed of the next billet of the current billet;

[0087] Wherein, the specified detection position is set on the billet movement path on the inlet side of the specified rolling mill and is at a first distance from the specified rolling mill; the first distance is the minimum length of the billet; the first speed is greater than the second speed.

[0088] Further, the device further includes:

[0089] A speed recovery unit, configured to restore the specified rolling mill to the first speed when the specified rolling mill runs at the second speed for a specified duration.

[0090] Further, the specified delay time is obtained according to the following formula: T = (D + r×L)÷V

[0091] Where: T represents the specified delay time, in seconds; D represents the first distance, in meters; L represents the distance between the specified rolling mill and the next rolling mill, in meters; r represents a proportionality factor for determining the separation point position of adjacent billets; V represents the first speed of the specified rolling mill, in meters per second.

[0092] Further, the tail detection unit 700 is specifically configured to detect whether the tail of the current billet reaches a specified detection position by receiving a signal from a thermal detection device;

[0093] Wherein, the thermal detection device is arranged between the heating furnace and the specified rolling mill and is at the first distance from the specified rolling mill; the thermal detection device is used to detect the tail of the billet;

[0094] The specified rolling mill is the first rolling mill after the heating furnace.

[0095] Further, r is 0.5.

[0096] Further, D is 6 meters and L is 1.4 meters.

[0097] The embodiment of the present invention provides a non-spacing speed reduction device for hot-rolled ribbed steel bars, which is a corresponding embodiment to the non-spacing speed reduction method for hot-rolled ribbed steel bars provided in the foregoing embodiment. The device embodiment can be understood according to the foregoing method embodiment and will not be elaborated herein.

[0098] The embodiment of the present invention has the following beneficial effects: When the detection device detects the tail of the billet, a delay is started; when the delay reaches the specified delay time and the specified rolling mill has a rolling current, the specified rolling mill is triggered to decelerate, realizing that the same hot-rolling production line can adapt to non-spacing speed reduction rolling of various non-fixed-length billets; for the same hot-rolling production line, without adjusting the software and hardware parameters related to non-spacing speed reduction, for example, without moving the position of the detection device and without adjusting the specified delay time, it is possible to produce any length of billet within the range from the specified minimum length billet to the maximum length billet, and in a single continuous production, the billets can be of the same length or of varying different lengths. Thus, it breaks through the limitation that the traditional non-spacing speed reduction function can only be used for specified fixed-length billets, bringing great convenience to production.

[0099] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the protection scope of the present disclosure. The appended method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specified order or hierarchy.

[0100] In the foregoing detailed description, various features are combined in a single embodiment to simplify the present disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention lies in less than all of the features of the single disclosed embodiment. Accordingly, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0101] The above-described embodiments have been presented for purposes of illustration and description to enable any person skilled in the art to make and use the invention. For those skilled in the art, various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit and scope of the disclosure. Thus, the disclosure is not limited to the embodiments given herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0102] The foregoing description includes one or more examples of embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but one of ordinary skill in the art should recognize that the various embodiments may be further combined and arranged. Accordingly, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. In addition, as used in the specification or claims, the term "comprising" is inclusive in its sense, as the term "including" is interpreted when used as a transitional word in a claim. Further, any use of the term "or" in the specification or claims is to mean "non-exclusive or".

[0103] Those skilled in the art will also appreciate that the various illustrative logical blocks, units, and steps described in the embodiments of the present invention may be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the various illustrative components, units, and steps have been described generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints of the overall system. For each particular application, those skilled in the art may implement the described functionality in a variety of ways, but such implementation should not be construed as departing from the scope of the embodiments of the present invention.

[0104] In the embodiments of the present invention, the various illustrative logical blocks or units described can be implemented or operated with their described functions by a general-purpose processor, a digital signal processor, an application specific integrated circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of the above designs. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0105] The steps of the methods or algorithms described in the embodiments of the present invention can be directly embedded in hardware, software modules executed by the processor, or a combination of both. The software modules can be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and the storage medium can be provided in an ASIC, and the ASIC can be provided in a user terminal. Optionally, the processor and the storage medium can also be provided in different components of the user terminal.

[0106] In one or more exemplary designs, the functions described in embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions may be stored on a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. A computer-readable medium includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. The storage media may be any available media that can be accessed by a general or special purpose computer. By way of example, and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and that can be accessed by a general or special purpose computer, or a general or special purpose processor. Additionally, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, DSL, or wireless means such as infrared, radio, and microwave, it is included in the definition of computer-readable medium. Disk and disc include compact disc, laser disc, optical disc, DVD, floppy disk, and Blu-ray disc, where disks usually reproduce data magnetically, while discs usually reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0107] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for non-stop speed reduction of hot-rolled ribbed steel bars, characterized in that, it includes: detecting whether the tail of the current billet reaches a specified detection position; when it is detected that the tail of the current billet reaches the specified detection position, starting a delay; when the delay reaches a specified delay time and the specified rolling mill has rolling current, triggering the specified rolling mill to reduce its speed from a first speed to a second speed so as to reduce the speed of the next billet of the current billet; wherein, the specified detection position is set on the billet moving path on the entrance side of the specified rolling mill and at a first distance from the specified rolling mill; the first distance is the minimum length of the billet; the first speed is greater than the second speed; the specified delay time is obtained according to the following formula: T = (D + r×L) ÷ V where: T represents the specified delay time, in seconds; D represents the first distance, in meters; L represents the distance between the specified rolling mill and the next rolling mill, in meters; r represents a proportionality factor for determining the separation point position of adjacent billets; V represents the first speed of the specified rolling mill, in meters per second; r is 0.

5.

2. The method for non-stop speed reduction of hot-rolled ribbed steel bars according to claim 1, characterized in that, it further includes: when the specified rolling mill runs at the second speed for a specified duration, restoring the specified rolling mill to the first speed.

3. The method for non-stop speed reduction of hot-rolled ribbed steel bars according to claim 1, characterized in that, detecting whether the tail of the current billet reaches a specified detection position includes: detecting whether the tail of the current billet reaches the specified detection position by receiving the signal of a thermal detection device; wherein, the thermal detection device is set between the heating furnace and the specified rolling mill and at the first distance from the specified rolling mill; the thermal detection device is used to detect the tail of the billet; the specified rolling mill is the first rolling mill after the heating furnace.

4. The method for non-stop speed reduction of hot-rolled ribbed steel bars according to claim 1, characterized in that, D is 6 meters and L is 1.4 meters.

5. A device for non-stop speed reduction of hot-rolled ribbed steel bars, characterized in that, it includes: a tail detection unit for detecting whether the tail of the current billet reaches a specified detection position; a delay unit for starting a delay when it is detected that the tail of the current billet reaches the specified detection position; a speed reduction unit for triggering the specified rolling mill to reduce its speed from a first speed to a second speed when the delay reaches a specified delay time and the specified rolling mill has rolling current so as to reduce the speed of the next billet of the current billet; wherein, the specified detection position is set on the billet moving path on the entrance side of the specified rolling mill and at a first distance from the specified rolling mill; the first distance is the minimum length of the billet; the first speed is greater than the second speed; the specified delay time is obtained according to the following formula: T = (D + r×L) ÷ V Wherein: T represents the specified delay time, in seconds; D represents the first distance, in meters; L represents the distance between the specified rolling mill and the next rolling mill, in meters; r represents the proportionality factor for determining the position of the separation point of adjacent billets; V represents the first speed of the specified rolling mill, in meters per second; and r is 0.

5.

6. The non-spacing speed reduction device for hot-rolled ribbed steel bars according to claim 5, characterized in that, it further comprises: a speed recovery unit configured to, when the specified rolling mill runs at the second speed for a specified duration, recover the specified rolling mill to the first speed.

7. The non-spacing speed reduction device for hot-rolled ribbed steel bars according to claim 5, characterized in that, the tail detection unit is specifically configured to: detect whether the tail of the current billet reaches a specified detection position by receiving a signal from a thermal detection device; wherein, the thermal detection device is arranged between the heating furnace and the specified rolling mill and is at the first distance from the specified rolling mill; the thermal detection device is used to detect the tail of the billet; the specified rolling mill is the first rolling mill after the heating furnace.

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