CN209520198U - A kind of wire and rod continuous casting and rolling production line - Google Patents

Abstract

The utility model discloses a continuous casting and rolling production line for wire and rod, which comprises a continuous casting machine, a roller conveyor system, a temperature compensation system, and a wire and rod rolling system; The slab quickly flows into the wire and bar rolling system. The induction heating device with a small footprint is used to compensate the online temperature loss of the slab and the temperature difference between the head and the tail. By combining the parallel flow roller table with the temperature compensation system, it can be reduced In the case of energy consumption and production costs, reduce and eliminate the temperature difference between the horizontal and vertical directions of the slab, improve the performance of wire and bar products, and increase the direct rolling rate when producing products of different specifications. The continuous casting and rolling products of this production line can be expanded to high-quality carbon structural steel, alloy steel and other special steel, with high energy utilization efficiency, energy saving and environmental protection, high energy utilization efficiency, energy conservation and environmental protection, and the quality of wire and bar products is guaranteed.

Description

A continuous casting and rolling production line for wire and rod

technical field

The utility model belongs to the field of metallurgical continuous casting and rolling, in particular to a continuous casting and rolling production line for wire rods.

Background technique

At present, the conventional production process of wire and bar is mostly: the molten steel is cooled and solidified through the tundish, crystallizer, and spray section of the continuous casting machine, and then straightened by the tension leveler to pull out the cast billet, and the billet is cut into a fixed shape by a flame cutting machine. After the size, it is sent to the continuous casting billet area by the conveying roller table. The casting slab that meets the hot delivery conditions is moved to the steel separator through the steel transfer machine or the steel hook machine, and the steel separator is directly sent to the rolling heating furnace through the hot delivery roller table. At this time, the casting slab generally has a temperature in the range of 500-700°C Inside, the rolled steel cannot be rolled directly, and needs to be reheated to 1040-1140°C in the heating furnace before it can be sent to the wire and bar rolling unit. The defect of this production process is that: reheating the high-temperature slab after cooling will easily cause a lot of energy consumption, even if it is hot charging and hot delivery, it still needs to be heated, which also consumes a lot of energy; the construction investment of the steel rolling heating furnace, daily maintenance , Material consumption, etc. will also consume huge economic inputs.

Therefore, in recent years, the billet has gradually developed towards the direct-feeding and direct-rolling technology. The core of the direct-feeding and direct-rolling technology is to increase the casting speed of the continuous casting machine, shorten the time from the continuous casting machine to the rolling mill, thereby increasing the temperature of the billet, and the billet does not pass through The heating furnace is directly rolled, the rolling start temperature is between conventional rolling and low-temperature rolling, and the final rolling temperature is not much different from conventional rolling temperature, which basically meets the rolling requirements of ordinary hot-rolled steel bars. However, the defect of this production process is that the continuous casting machine and the rolling system need to be well matched, but because the rolling system needs to produce wire bars of different specifications and models, its hourly output varies greatly with the specifications, and the continuous casting machine is limited. Due to the arrangement of the hydraulic shears, the adjustment range of the production pulling speed is very small, resulting in a large amount of slabs coming off the production line, and the direct rolling rate is low after the steel rolling is changed to the steel specification; in order to ensure the rolling temperature, the product specifications of the continuous casting machine and the rolling system are Single; at the same time, the congenital head-to-tail temperature difference during continuous casting at low casting speed also affects the performance of wire and bar products. Therefore, at present, it mainly produces steel for hot-rolled steel bars that do not require high product performance.

Contents of the invention

In view of this, the utility model is to provide a continuous casting and rolling production line for wire and rod. By optimizing the composition and layout of the production line, it can reduce and eliminate the temperature difference between the horizontal and vertical directions of the slab, improve the performance of wire and rod products and increase the production capacity of different specifications. The purpose of the direct rolling rate of the product.

In order to achieve the above object, the utility model provides the following technical solutions:

A continuous casting and rolling production line for wire and rod, including a continuous casting machine, a roller conveyor system, a temperature compensation system, and a wire and rod rolling system; , the post-cutting roller table, the blank roller table, the parallel flow roller table and the hot delivery roller table; the temperature compensation system is mainly composed of an induction heating device and a temperature detection device; the length of the roller body of the parallel flow roller table gradually shrinks along the conveying direction, And both sides of the co-current roller table are provided with baffles; the temperature detection device includes a temperature detection device I and a temperature detection device II which are correspondingly arranged at the inlet end and the outlet end of the induction heating device.

Furthermore, the continuous casting machine is a 4-10 multi-strand billet continuous casting machine with a production specification of 150-200mm ² , and the basic radius of the continuous casting machine is R8.0-10.0m.

Furthermore, the continuous casting machine is mainly composed of a tundish, a crystallizer, a crystallizer vibrating device, a secondary cooling spray section, a guide roller, a tension leveler and a shearing device; among them, there is a Temperature detection device III.

Further, the shearing device is a flame cutter or a hydraulic shear.

Further, a temperature detection device IV is provided between the cutting roller table and the billet discharge roller table.

Further, thermal insulation covers are provided on the front roller table, the rear roller table and the hot delivery roller table.

Further, a steel transfer machine or a steel hook machine is provided above the billet roller table, and a collection stand or a turning cooling bed is provided on the side of the billet roller table.

Further, several groups of induction heating devices are interspersed between the hot-feeding roller tables, and the straight-line length of the hot-feeding roller tables in front and behind each group of induction heating devices is at least greater than one cut length.

Further, the wire and bar rolling system includes a high-pressure water dephosphorization device, a rolling table, a slab scrap kicking device and a rolling unit; the rolling unit is mainly composed of a rough rolling unit, an intermediate rolling unit and a finishing rolling unit.

The beneficial effects of the utility model are:

The production line can quickly and concurrently flow the billet produced by the multi-strand continuous casting machine into the wire and bar rolling system. It adopts an induction heating device with a small footprint to compensate the online temperature loss of the billet and the temperature difference between the head and the tail. The combination of the roller table and the temperature compensation system can reduce and eliminate the temperature difference between the horizontal and vertical directions of the slab while reducing energy consumption and production costs, improve the performance of wire and bar products, and increase the direct rolling rate when producing products of different specifications. The continuous casting and rolling products of this production line can be expanded to high-quality carbon structural steel, alloy steel and other special steel, with high energy utilization efficiency, energy saving and environmental protection, high energy utilization efficiency, energy conservation and environmental protection, and the quality of wire and bar products is guaranteed.

Description of drawings

In order to make the purpose, technical solutions and beneficial effects of the utility model clearer, the utility model provides the following drawings for illustration:

Fig. 1 is the system schematic diagram of the present utility model;

Fig. 2 is the side view of Fig. 1;

Figure 3 is a schematic diagram of the parallel flow roller table structure.

Detailed ways

The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

A continuous casting and rolling production line for wire and rod, including a continuous casting machine, a roller conveyor system, a temperature compensation system, and a wire and rod rolling system; 11. The roller table 13 after cutting, the billet roller table 15, the parallel flow roller table 20 and the hot delivery roller table 21; the temperature compensation system is mainly composed of the induction heating device 23 and the temperature detection device; the roller body of the parallel flow roller table 20 The length gradually shrinks along the conveying direction, and baffles 19 are provided on both sides of the co-current roller table; the temperature detection device includes a temperature detection device I22 and a temperature detection device II correspondingly arranged at the inlet and outlet ends of the induction heating device 23 .

Specifically, the baffles 19 are fixedly arranged on both sides of the co-current roller table 20, and are used to guide the slabs when the slabs flow in parallel. The temperature detection device I22 and the temperature detection device II in the temperature compensation system need to be installed at the inlet port and the outlet port of the induction heating device 23, and the induction heating device 23 switches the work according to the real-time temperature measurement results of the temperature detection device I22 and the temperature detection device II /standby mode. The induction heating device 23 can be provided with one or more groups according to requirements, and each group of induction heating devices is interspersed between two heat-feeding roller tables, and the straight-line length of the heat-feeding roller table before and behind each group of induction heating devices is at least greater than 1 At the same time, the driving motor of the hot-feeding roller table needs to use a variable frequency motor, so that the selective heating of the head of the slab can be realized according to the demand, and the adjustment of the conveying speed of the slab during the heating process can also be realized, which is beneficial to the conveying The process is better matched to the heating process to optimize energy saving and efficiency improvement.

The continuous casting machine in this production line is a 4-10 multi-strand billet continuous casting machine with a production specification of 150-200mm2, and the basic radius of the continuous casting machine is ^R8.0-10.0m . Specifically, the continuous casting machine is mainly composed of a tundish 3, a crystallizer 4, a crystallizer vibration device 5, a secondary cooling spray section 6, a guide roller 7, a tension leveler 9, and a shearing device 12; the secondary cooling spray section A temperature detection device III 8 is provided between 6 and the tension leveler 9 . The continuous casting machine is equipped with a secondary cooling dynamic control model, and the temperature detection device Ⅲ8 is used to detect the temperature of the slab in real time. The secondary cooling water volume of the secondary cooling spray section 6 is corrected by the dynamic water distribution model according to the real-time temperature measurement results of the temperature detection device III 8 arranged in front of the tension leveler 9, so as to ensure the straightening temperature and rolling temperature of the slab, and further Ensure billet quality and improve energy efficiency.

In this production line, a temperature detection device IV14 is arranged between the roller table 23 after cutting and the blank roller table 15. A temperature detection device IV14 is installed in front of the billet roller table 15 to detect the temperature of the billet after cutting, and the billet tracking management model judges whether the billet temperature is within the temperature compensation of the induction heating device 23 per unit time according to the production rhythm and steel type. within range.

The production line combines the parallel flow roller table with gradually shrinking roller body length and the temperature compensation system. On the one hand, the continuous casting machine adopts the secondary cooling dynamic control model based on the (online) temperature detection device 8 to dynamically distribute water, thereby controlling the continuous flow rate. Slab temperature; the temperature detection device 14 can track and determine the slab temperature in real time based on the slab tracking management model, and the induction heating device 23 with a small footprint can compensate the slab temperature online, reducing and eliminating the slab temperature. On the other hand, the parallel flow roller table 20 in the roller table conveying system can realize fast parallel flow, further reducing the temperature loss; the two cooperate with each other to improve the performance of wire and bar products.

This production line can stabilize the performance of wire and bar products and increase the direct rolling rate of continuous casting and rolling while reducing energy consumption and production costs. At the same time, continuous casting and rolling products can be expanded to high-quality carbon structural steel, alloy steel and other special features Steel, high energy utilization efficiency, energy saving and environmental protection.

The above-mentioned shearing device 12 is a flame cutter or a hydraulic shear. When improving energy utilization efficiency, hydraulic shears should be used first to reduce the temperature compensation amount of the induction heating device 23 for the slab.

In this production line, the heat preservation cover 10 is provided on the roller table 11 before cutting, the roller table 13 after cutting and the hot delivery roller table 21 . The thermal insulation cover 10 is arranged on the top of each flow roller table frame, which can reduce heat dissipation and improve energy utilization efficiency. Simultaneously, the drive motors of the front roller table 11 before cutting, the roller table 13 after cutting and the billet roller table 15 require frequency conversion motors to adapt to different process production requirements.

In this production line, a steel transfer machine or a steel hook machine 16 is provided above the billet roller table 15, and a collecting stand or a turning cooling bed 18 is arranged on the side of the billet rolling table 15, and the collecting stand or turning cooling bed 18 passes through the transition stand 17 is connected with the side of billet roller table 15, and is used for rolling off the assembly line when the hourly output of the continuous casting machine is greater than the rolling output.

In this production line, the wire and bar rolling system includes a high-pressure water dephosphorization device 24, a rolling roller table 25, a slab scrap kicking device 26, and a rolling unit 27; wherein the rolling unit 27 is mainly composed of a rough rolling unit, an intermediate rolling unit and a finish rolling unit. It is composed of conventional wire and bar production equipment such as unit.

When the continuous casting machine in this production line produces steel for hot-rolled steel bars, the casting speed should be increased to greater than or equal to 2.8m/min to reduce the operating time of the temperature compensation system and reduce production energy consumption. The maximum conveying speed of the conveying roller in the roller conveying system should be greater than or equal to 1.5m/s, and the maximum conveying speed of the billet roller 15 and the hot-feeding roller 21 should be greater than or equal to 3m/s, so as to increase the conveying speed of the roller and reduce the The heat loss of the slab reduces the production energy consumption.

Take a specific production line as an example

The continuous casting machine adopts a continuous casting machine with a basic radius of R9.0m to produce billets with a size of 165mm×165mm and a fixed length of 12m. In order to make better use of the casting temperature, the casting speed is controlled at 2.8m/ Min or more, according to the converter capacity and the hourly output of bars, a 4-strand continuous casting machine can be selected, and the hourly output of the continuous casting machine can reach 140t/h. During production, molten steel passes through the molten steel tank turntable 1, molten steel tank 2, tundish 3, crystallizer 4, crystallizer vibrating device 5, secondary cooling spray section 6, guide roller 7, tension leveler 9, and the continuous casting machine is equipped with The secondary cooling dynamic control model, a temperature detection device Ⅲ8 is installed between the secondary cooling spray section and the tension leveler to detect the slab temperature in real time, and the secondary cooling water in the spray section is determined by the dynamic water distribution model according to the set temperature detection device in real time The temperature measurement results are used to correct the water quantity, so as to ensure the straightening temperature and rolling temperature of the slab, further ensure the quality of the slab and improve the energy utilization rate.

The heat preservation cover 10 is arranged on the roller table 11 before cutting, the roller table 13 after cutting and the heat-feeding roller table 21, and the protective cover reduces heat loss and improves energy utilization efficiency.

After passing through the tension leveler 9, hydraulic shears are used to quickly cut off the slab solidified by the liquid core. Under normal production conditions, the average surface temperature of the slab after cutting is between 960 and 1100°C. After cutting, the slab runs quickly to the conveyor When on the roller table, the temperature detection device IV14 located in the front section of the billet roller table 15 measures the temperature of the head of the billet, and the billet tracking management model judges whether the billet temperature is within the induction heating device 23 according to the production rhythm and steel type. Within the range of temperature compensation per unit time, if a single group of induction heating devices corresponding to 4 streams requires the heating time of a single slab to be less than or equal to 50s, if it does not meet the requirements, multiple groups of induction heating devices need to be installed. This solution should preferably increase the casting speed and control To control the surface temperature of the slab, set up a single group of induction heating devices to reduce heat loss as much as possible. For the slab whose temperature is too low and exceeds the heating capacity of the subsequent induction heating device, after the slab is transported to the billet discharge roller table 15, the slab off-line system will start to reject the individual slab and send it directly, such as continuous casting machine production The head and tail slabs in the tundish, the slab when the tundish is replaced. The casting slab whose temperature meets the requirements of direct rolling will be quickly sent to the induction heating device by the billet discharge roller table and parallel flow roller table, and the temperature of the casting slab can be kept above 940°C.

The maximum conveying speed of the conveying roller table should be greater than or equal to 1.5m/s, and the maximum conveying speed of the billet roller table and hot delivery roller table should be greater than or equal to 3m/s. Increase the conveying speed of the roller table, reduce the heat loss of the billet, and reduce production energy consumption.

The induction heating device switches between working and standby states according to the real-time temperature measurement results of the front and rear temperature detection devices. For steel for hot-rolled steel bars under normal production conditions, the induction heating device only needs to increase the temperature of the head of the slab to save energy, and at the same time solve the problem of unqualified slabs caused by the temperature difference between the head and the tail. After the induction heating device, the average temperature of the slab can be raised to 1020-1060°C. After passing through the high-pressure water dephosphorization device and the rolling table, the temperature of the first roughing mill can be kept above 960°C, which meets the rolling requirements.

When 7-10 strands continuous casting machine is used for production, the unit hour output of continuous casting machine will be much larger than the production capacity of a single rolling line, so usually one continuous casting machine is required for production of multiple rolling lines. At this time, the parallel flow roller table needs The method shown in Fig. 3 is adopted, that is, the rear end of the parallel flow roller table is divided into multiple channels, and the length of the roller body of each separated channel gradually shrinks along the conveying direction, so that the cast slabs are quickly sent to different rolling lines respectively.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in the form Various changes can be made in the above and in the details without departing from the scope defined by the claims of the present invention.

Claims (9)

1. a kind of wire and rod continuous casting and rolling production line, including conticaster, roller-way transportation system, temperature compensation system and bar Material rolling system；Wherein roller-way transportation system mainly by roller-way after cutting front roller-way arranged successively in the conveying direction, cutting, go out Blank roller way, cocurrent roller-way and hot sending roller-way composition；Temperature compensation system is mainly filled by induction heating apparatus and temperature detection Set composition；It is characterized by: the barrel length of cocurrent roller-way is gradually tapered up along conveying direction, and the two sides of cocurrent roller-way are equipped with gear Plate；Temperature-detecting device includes the temperature-detecting device I and temperature for being correspondingly arranged at induction heating apparatus arrival end and outlet end Detection device II.

2. wire and rod continuous casting and rolling production line according to claim 1, it is characterised in that: conticaster is that production specification is 150~200mm²4~10 multithread billet casters, the basic radius of conticaster is R8.0~10.0m.

3. wire and rod continuous casting and rolling production line according to claim 2, it is characterised in that: conticaster mainly by pans, Crystallizer, mould vibration device, two cold water spray sections, guide roller, withdrawal straightening machine and shear composition；Wherein two cold water spray section Temperature-detecting device III is equipped between withdrawal straightening machine.

4. wire and rod continuous casting and rolling production line according to claim 3, it is characterised in that: shear is flame cutting machine Or hydraulic shear.

5. wire and rod continuous casting and rolling production line according to claim 1, it is characterised in that: roller-way and ejection roller way after cutting Between be equipped with temperature-detecting device IV.

6. wire and rod continuous casting and rolling production line according to claim 1, it is characterised in that: cutting front roller-way, cutting back roller Road and hot sending roller-way are equipped with insulation cover.

7. wire and rod continuous casting and rolling production line according to claim 1, it is characterised in that: be equipped with above ejection roller way and move steel Machine or hook steel machine, ejection roller way side are equipped with collecting frame or turn over cooling bed.

8. wire and rod continuous casting and rolling production line according to claim 1, it is characterised in that: several groups induction heating apparatus is worn It plugs and sets between hot sending roller-way and the hot sending roller-way straight length of the forward and backward side of each group induction heating apparatus is fixed at least more than 1 Ruler.

9. any wire and rod continuous casting and rolling production line according to claim 1~8, it is characterised in that: wire and rod rolling system System kicks waste-removing device and rolling mills including high pressure water dephosphorization apparatus, roller bed, slab；Wherein rolling mills are mainly by roughing Unit, intermediate mill and mm finishing mill unit composition.