Method for improving the efficiency of the breakout roller table of a billet caster

Abstract

The present application belongs to the field of steelmaking continuous casting, and relates to a method for improving the operation efficiency of a billet continuous casting machine billet discharge roller way. The operation control system of the roller way is designed to avoid long-term high-speed operation of the equipment caused by human factors, and to solve the problem that two steels may be simultaneously sent out after the red billets of other roller ways in the same group are in place, causing accidents such as roller way steel jamming. The present application solves the problems affecting the efficiency of hot charging and the occurrence of faults from the method of equipment control system. The present application can effectively improve the utilization rate of the billet discharge roller way and avoid energy consumption caused by long-term high-speed operation; ensure the stability of hot straight rolling, and avoid the influence of other roller ways in the same group on the high-speed steel tapping; and avoid the failure of the billet discharge roller way to stop high-speed operation caused by hot detection signal faults, and manual billet turning can also make the roller way turn to low speed or stop.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking continuous casting and relates to a method for improving the operating efficiency of the billet exit roller conveyor of a billet continuous casting machine. Background Technology

[0002] The original process of the six-strand billet casting machine in the steel plant involved opening the ladle of molten steel and sending it to the intermediate ladle car. After being heated in one strand, the molten steel was vibrated through the crystallizer and entered the leveling machine area. The casting length reached about 17m before exiting the leveling machine and entering the cutting area. After that, it was transported to the cooling bed via the cutting roller conveyor, transport roller conveyor, and billet exit roller conveyor. However, after the hot-rolling process was modified, the red billets can now be sent to the cooling bed or directly to the rolling mill for hot-rolling.

[0003] During the process, the hot detection signals at the transport rollers and lifting baffles detect the arrival signal of each billet. Then, the timer set by the program counts the billets that arrive first and sends them to the Honggang direct-rolling mill production line through 4 sets of billet exit rollers. Currently, it is set that the count will restart 42 seconds after the billet is sent out before the next billet can be sent.

[0004] Currently, there is some overlap between the red billet delivery line and the hot-rolled direct rolling line. In the red billet delivery line, the billet is flipped up by a turning machine and placed on the cooling bed. In the hot-rolled direct rolling line, the red billet is directly sent to subsequent processes, with one set of roller conveyor motors driving three adjacent sets of long rollers. Therefore, in the existing procedure: if any flow is in a non-hot-rolled direct rolling process, in automatic mode, when the red billet reaches the insulation cover, the heat detection signal detects the red billet and remains for 8 seconds before the set of billet delivery rollers stops operating at high speed. If the operator manually flips the billet during this period, the signal remains for less than 8 seconds, and the entire set of billet delivery rollers does not stop operating at high speed, thus affecting the other two flows of hot-rolled billet and reducing the efficiency of hot-rolled billet delivery. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for improving the operating efficiency of the billet continuous casting machine's billet discharge roller conveyor. By designing the operation control system of the roller conveyor, the long-term high-speed operation of the equipment due to human error can be avoided.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for improving the running efficiency of the billet discharge roller conveyor in a billet continuous casting machine, comprising the following steps:

[0007] S1, the molten steel is opened to the intermediate ladle car, and after being boiled in a continuous stream, the molten steel enters the straightening machine area through the crystallizer vibration. The casting length reaches about 17m and exits the straightening machine into the cutting area. After that, it is transported to the cooling bed or directly sent to the rolling mill for hot rolling through the cutting roller conveyor, transport roller conveyor and billet roller conveyor.

[0008] S2, during which each batch of steel billets is detected by the hot detection signal at the transport rollers and the lifting baffle, the steel billet arrival signal is then detected by the timer set by the program. The steel billets that arrive first are sent to the Honggang direct rolling mill production line through 4 sets of billet exit rollers. Currently, it is set that the count will be restarted 42 seconds after the steel billet is sent out before the subsequent steel billets can be sent.

[0009] S21, if any flow is in the non-hot conveying direct rolling process, when the red billet reaches the heat preservation cover in automatic mode, the hot detection signal detects the red billet and holds for 6 seconds, the group of billet exit rollers stops high-speed operation.

[0010] S22, under the condition of manual steel turning, immediately stop the high-speed operation of this group of rollers, forming a parallel relationship with the first point above. In different production rhythms, either of these two situations can cause the rollers to stop high-speed operation and switch to low-speed operation.

[0011] Optionally, the electrical control method includes communication between S7-200SMART and S7-1500. S7-200SMART is used as the IO device, and S7-1500 is used as the controller. The roller conveyor before cutting, after cutting, heat preservation and cooling bed are controlled respectively, and then the on-site motor is controlled by the frequency converter to drive the roller rotation.

[0012] Optionally, if the heat detector detects red steel, a red steel timer will be issued for 6 seconds, or the operator will manually flip the steel off the line. Either of these conditions will cause the roller conveyor to slow down.

[0013] Optionally, the hot-rolled direct rolling mode or the offline mode of all 6 streams do not affect each other.

[0014] The beneficial effects of this invention are as follows: This invention can effectively improve the utilization rate of the billet discharge roller table and avoid the energy consumption of long-term high-speed operation; ensure the stability of hot-feed direct rolling and will not be affected by the flow of other roller tables in the same group under high-speed steel delivery; avoid the billet discharge roller table from being unable to stop high-speed operation due to hot detection signal failure, and can also be turned to low speed or stopped by manual steel turning.

[0015] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a schematic diagram of the production workshop for the present invention. Detailed Implementation

[0018] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0019] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0020] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] Please see Figure 1 A method for improving the running efficiency of the billet discharge roller conveyor in a billet continuous casting machine includes the following steps:

[0022] S1, the molten steel is opened to the intermediate ladle car, and after being boiled in a continuous stream, the molten steel enters the straightening machine area through the crystallizer vibration. The casting length reaches about 17m and exits the straightening machine into the cutting area. After that, it is transported to the cooling bed or directly sent to the rolling mill for hot rolling through the cutting roller conveyor, transport roller conveyor and billet roller conveyor.

[0023] S2, during which each batch of steel billets is detected by the hot detection signal at the transport rollers and the lifting baffle, the steel billet arrival signal is then detected by the timer set by the program. The steel billets that arrive first are sent to the Honggang direct rolling mill production line through 4 sets of billet exit rollers. Currently, it is set that the count will be restarted 42 seconds after the steel billet is sent out before the subsequent steel billets can be sent.

[0024] S21, if any flow is in the non-hot conveying direct rolling process, when the red billet reaches the heat preservation cover in automatic mode, the hot detection signal detects the red billet and holds for 6 seconds, the group of billet exit rollers stops high-speed operation.

[0025] S22, under the condition of manual steel turning, immediately stop the high-speed operation of this group of rollers, forming a parallel relationship with the first point above. In different production rhythms, either of these two situations can cause the rollers to stop high-speed operation and switch to low-speed operation.

[0026] In this embodiment, the electrical control method includes communication between S7-200SMART and S7-1500. S7-200SMART acts as an I / O device, and S7-1500 acts as a controller. It controls the pre-cutting, post-cutting, heat preservation, and cooling bed roller conveyors respectively, and then controls the field motor to drive the rollers to rotate through the frequency converter.

[0027] In this embodiment, if the thermal detector detects red steel, a red steel timing of 6 seconds will be issued, or the operator will manually flip the steel off the line. Either of these conditions will cause the roller conveyor to slow down.

[0028] In this embodiment, the hot-rolled direct rolling mode or the offline mode of all 6 streams do not affect each other.

[0029] This invention has been successfully applied to the billet exit roller conveyor in steel plants, effectively improving the stability of the billet exit roller conveyor operation, reducing mutual interference between rollers in the same group, and improving the efficiency of hot-rolling direct rolling. At the same time, in the event of a hot detection signal failure, the billet exit roller conveyor can be manually stopped at high speed, which is beneficial for troubleshooting and further ensures smooth production.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for improving the running efficiency of the billet discharge roller conveyor in a billet continuous casting machine, characterized in that, Includes the following steps: S1, the molten steel from the ladle is opened to the intermediate ladle car. After being boiled in a continuous stream, the molten steel enters the straightening machine area through the crystallizer vibration. The casting length reaches 17m and exits the straightening machine into the cutting area. After that, it is transported to the cooling bed or directly sent to the rolling mill for hot rolling through the cutting roller conveyor, transport roller conveyor and billet roller conveyor. S2, during which each batch of steel billets is detected by the hot detection signal at the transport rollers and the lifting baffle, the steel billet arrival signal is detected, and then the steel billet that arrives first is sent to the Honggang direct rolling mill production line through 4 sets of billet exit rollers by the timer set by the program. 42 seconds after the steel billet is sent out, the count is restarted and the subsequent steel billets are sent. S21, if any flow is in the non-hot conveying direct rolling process, when the red billet reaches the heat preservation cover in automatic mode, the hot detection signal detects the red billet and holds for 6 seconds, the group of billet exit rollers stops high-speed operation. S22, under the condition of manual steel turning, immediately stop the high-speed operation of this group of rollers, forming a parallel relationship with the first point above. In different production rhythms, either of these two situations can cause the rollers to stop high-speed operation and switch to low-speed operation.

2. The method for improving the running efficiency of the billet discharge roller conveyor of a billet continuous casting machine according to claim 1, characterized in that: The electrical control method includes communication between S7-200SMART and S7-1500, with S7-200SMART acting as an I / O device and S7-1500 acting as a controller; it controls the pre-cutting roller conveyor, post-cutting roller conveyor, heat preservation roller conveyor, and cooling bed roller conveyor respectively, and controls the field motor to drive the roller rotation through the frequency converter.

3. The method for improving the running efficiency of the billet discharge roller conveyor of a billet continuous casting machine according to claim 1, characterized in that: The hot-rolled direct rolling mode or the offline mode of all 6 streams do not affect each other.

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