New steel rolling production line using cutting-type billet opening

Abstract

The present invention belongs to the field of steel rolling technology and steel rolling technology in the metallurgical industry, and in particular, relates to a new type of steel rolling production line using cutting-type blanking, which is characterized by comprising a billet heating device, a blanking unit connected to the billet heating device, an online heat preservation and temperature compensation system connected to the blanking unit, a finishing mill or a finishing mill unit, a sizing device, a product cooling and collecting device, and the blanking unit includes a first billet cutting blanking device, a conveying and shaping system, a second billet cutting blanking device, a conveying and shaping system, and an Nth billet cutting blanking device. Compared with the traditional steel rolling production line, the present invention does not use a rough rolling unit and a medium rolling unit, so that the energy consumption of steel rolling production is greatly reduced, and the investment cost of the steel rolling production line is also greatly reduced, so it has good economic and social benefits.

Description

Technical Field

[0001] The invention belongs to the field of steel rolling technology and steel rolling technology in the metallurgical industry, and in particular relates to a new steel rolling production line adopting cutting-type blanking. Background Art

[0002] In the current steel rolling production technology, whether it is continuous rolling production or semi-continuous rolling production, the main production equipment used in the production line is composed of heating equipment, rough rolling mill or rough rolling unit, intermediate rolling unit, finishing rolling unit, cooling and collection equipment, etc. The steel billet is heated by the heating equipment to reach the steel rolling temperature, and enters the rough rolling unit and the intermediate rolling unit in turn, so that the cross-sectional area of ​​the steel billet is gradually reduced through the rolling of the above rolling units, until the cross-sectional area of ​​the steel billet is reduced to meet the conditions for entering the finishing unit, and then enters the finishing unit, and is rolled by the finishing unit to form the final steel product, and then enters the cooling and collection equipment for cooling and product collection. Existing steel rolling technologies such as the various steel rolling production lines mentioned in Patent No. 202010042179.2, Patent No. 201911325629.2, and Patent No. 201610011589.4 are all traditional production forms using the above steel rolling technology. The disadvantages of this traditional production form are that the rough rolling mill and the intermediate rolling mill are large in size, heavy in weight, and have high energy consumption, requiring a large installed capacity. The production line occupies a large area and has a large usable space. The steel rolling plant construction investment is large and the construction period is long. In addition, after the steel rolling production line is put into production, a large amount of spare parts consumption and high daily labor maintenance costs are generated.

[0003] Therefore, if small-section steel billets can be directly used to roll steel products only through the finishing mill, for the same scale of production capacity, on the one hand, it will directly save more than 60% of equipment investment, save more than 50% of the use area, and reduce the power consumption of the production line by more than 70%. On the other hand, it will save a lot of equipment spare parts consumption and labor maintenance costs. However, the acquisition of small-section steel billets, especially the acquisition of low-cost small-section steel billets, is the main difficulty faced by current technology. The use of continuous casting machines to produce small-section cast billets that can be directly finished is not feasible in the current environment due to the difficulties in technology, cost and safety. The use of reciprocating billet opening machines can easily obtain small-section steel billets, but its high production cost will undoubtedly be uncompetitive and equally unfeasible. Summary of the invention

[0004] The purpose of the present invention is to provide a new type of steel rolling production line using cutting-type blanking, through which large-section continuous casting billets are cut into small-section billets, and then the small-section billets formed after cutting are directly rolled through a finishing rolling unit to produce steel products, thereby achieving the purpose of reducing the area occupied by the production line, greatly reducing the investment in production line equipment, saving energy and reducing consumption, and reducing the consumption of spare parts and labor maintenance costs of the production line on the one hand.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The new steel rolling production line adopting the cutting type blanking of the present invention is characterized in that it includes a billet heating device, a blanking unit connected to the billet heating device, an online heat preservation and temperature compensation system connected to the blanking unit, a finishing mill or a finishing mill unit connected to the online heat preservation and temperature compensation system, a sizing device connected to the finishing mill or the finishing mill unit, and a product cooling and collecting device connected to the sizing device.

[0007] The blanking unit includes a first blanking device for cutting and blanking steel billets, a conveying and shaping system connected to the first blanking device, a second blanking device connected to the conveying and shaping system, a conveying and shaping system connected to the second blanking device, and an Nth blanking device connected to the conveying system.

[0008] The first cutting and opening equipment, the second cutting and opening equipment or the Nth cutting and opening equipment are all composed of a billet cutting type opening machine unit. The billet cutting type opening machine unit includes several billet cutting type opening machines. The billet cutting type opening machine includes a motor, a reducer connected to the motor, a tool rotating shaft group connected to the output shaft of the reducer through a coupling, and a cutting tool group arranged on the tool rotating shaft group. The tool rotating shaft group is arranged in the billet cutting machine frame, and the motor is connected to the electrical control system.

[0009] The conveying and shaping system comprises a roller conveying system and a billet shaping device after the billet is cut and opened, which is connected to the roller conveying system.

[0010] The tool rotating shaft group is an upper rotating shaft and a lower rotating shaft arranged in parallel, and the cutting tool group is an upper cutting knife and a lower cutting knife respectively arranged on the upper rotating shaft and the lower rotating shaft.

[0011] The tool rotating shaft group comprises a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting tool group comprises a left cutting knife and a right cutting knife which are arranged on the left rotating shaft and the right rotating shaft respectively.

[0012] The tool rotating shaft group includes an upper rotating shaft and a lower rotating shaft arranged in parallel, and a left rotating shaft and a right rotating shaft arranged in parallel. The cutting tool group includes an upper cutting knife and a lower cutting knife respectively arranged on the upper rotating shaft and the lower rotating shaft, and a left cutting knife and a right cutting knife respectively arranged on the left rotating shaft and the right rotating shaft.

[0013] The cutting heads of the cutting tool set are roller cutting heads, disc cutting heads or a combination of roller cutting heads and disc cutting heads, and the spacing between each cutting head of the cutting tool set is an adjustable spacing or a fixed spacing.

[0014] The roller conveying system is mainly composed of a blank discharging roller, a pre-cutting roller, a post-cutting roller and various sections of conveying rollers which are sequentially arranged along the conveying direction.

[0015] The online heat preservation and temperature compensation system is mainly composed of a heat preservation cover made of refractory heat preservation material, an online induction heating device and a temperature detection device. The online induction heating device is interspersed between the conveying rollers of the roller conveying system.

[0016] The billet shaping equipment after the billet is cut and opened is mainly composed of a motor I, a reducer I, a transmission box, a machine body, guides and shaping rollers.

[0017] Advantages of the present invention:

[0018] The new steel rolling production line adopting cutting-type blanking of the present invention provides a metal rolling production line with energy conservation, environmental protection and superior investment economy. This production line will cut the steel billets heated to the steel rolling temperature into small-section metal billets through the steel billet mechanical cutting blanking equipment, so as to achieve the purpose of using only the finishing rolling unit to roll the steel products; since this production line does not need to be equipped with the rough rolling unit and the intermediate rolling unit of the traditional steel rolling production line, only the finishing rolling unit is used, thus greatly reducing the investment for rolling steel products and greatly reducing the production energy consumption; adopting the production line of the present invention will reduce the electricity consumption per ton of steel by more than 60%, save more than 50% of the floor space of the production line, and reduce the investment of the steel rolling production line with the same production capacity by more than 60%, thus having obvious economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the steel billet cutting type billet opening machine of the present invention.

[0021] Figure 3 It is a schematic diagram of the structure when the cutting blades of the cutting blade set of the present invention are arranged in four directions: up, down, left and right.

[0022] Figure 4 It is a schematic diagram of the steel billet cutting process of the present invention. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings.

[0024] like Figure 1-4 As shown, the novel steel rolling production line adopting the cutting type blanking of the present invention is characterized in that it includes a billet heating device 1, a blanking unit connected to the billet heating device 1, an online heat preservation and temperature compensation system 6 connected to the blanking unit, a finishing mill or a finishing mill unit 7 connected to the online heat preservation and temperature compensation system 6, a sizing device 8 connected to the finishing mill or the finishing mill unit 7, and a product cooling and collecting device 9 connected to the sizing device 8.

[0025] The blanking unit includes a first blanking device 2 for cutting blanks, a conveying and shaping system connected to the first blanking device 2, a second blanking device 5 connected to the conveying and shaping system, a conveying and shaping system connected to the second blanking device 5, and an Nth blanking device connected to the conveying system.

[0026] The first cutting and opening equipment 2, the second cutting and opening equipment 5 or the Nth cutting and opening equipment are all composed of a billet cutting type opening machine unit, which includes several billet cutting type opening machines. The billet cutting type opening machine includes a motor 10, a reducer 11 connected to the motor 10, a tool rotating shaft group 15 connected to the output shaft of the reducer 11 through a coupling 12, and a cutting tool group 13 arranged on the tool rotating shaft group 15. The tool rotating shaft group 15 is arranged in a billet cutting machine frame 14, and the motor 10 is connected to an electrical control system.

[0027] The conveying and shaping system comprises a roller conveying system 3 and a billet shaping device 4 connected to the roller conveying system 3 for cutting and splitting the billet.

[0028] The tool rotating shaft group 15 is an upper rotating shaft and a lower rotating shaft arranged in parallel, and the cutting tool group 13 is an upper cutting knife 13-1 and a lower cutting knife 13-2 respectively arranged on the upper rotating shaft and the lower rotating shaft.

[0029] The tool rotating shaft group 15 is a left rotating shaft and a right rotating shaft arranged in parallel, and the cutting tool group 13 is a left cutting knife 13 - 3 and a right cutting knife 13 - 4 respectively arranged on the left rotating shaft and the right rotating shaft.

[0030] The tool rotation axis group 15 includes an upper rotation axis and a lower rotation axis arranged in parallel, and a left rotation axis and a right rotation axis arranged in parallel. The cutting tool group 13 includes an upper cutting knife 13-1 and a lower cutting knife 13-2 respectively arranged on the upper rotation axis and the lower rotation axis, and a left cutting knife 13-3 and a right cutting knife 13-4 respectively arranged on the left rotation axis and the right rotation axis.

[0031] The cutting heads of the cutting tool set 13 are roller cutting heads, disc cutting heads or a combination of roller cutting heads and disc cutting heads. The spacing between each cutting head of the cutting tool set 13 is an adjustable spacing or a fixed spacing.

[0032] The roller conveying system 3 is mainly composed of a blank discharge roller, a pre-cutting roller, a post-cutting roller and various sections of conveying rollers which are sequentially arranged along the conveying direction.

[0033] The online insulation and temperature compensation system 6 is mainly composed of an insulation cover made of refractory insulation material, an online induction heating device and a temperature detection device. The online induction heating device is interspersed between the various conveying rollers of the roller conveyor system 3.

[0034] The billet shaping device 4 after the billet is cut and opened is mainly composed of a motor I, a reducer I, a transmission box, a machine body, guides and shaping rollers.

[0035] The new steel rolling production line adopting cutting-type billet opening of the present invention is mainly composed of billet heating equipment 1, billet cutting and billet opening equipment, roller conveying system 3, online insulation and temperature compensation system 6, billet shaping equipment after billet cutting and billet opening 4, finishing mill or finishing mill group 7, sizing equipment 8, product cooling and collection equipment 9, etc.

[0036] The billet heating device 1 can be a billet continuous casting machine hot delivery, various heating furnaces capable of heating the billet, or medium frequency induction heating equipment, etc., which can heat the billet to the rolling temperature.

[0037] The billet cutting and opening equipment is composed of one or more billet cutting and opening machines, each of which is composed of a motor 10, a reducer 11, a tool rotating shaft group 15 and a cutting tool group 13. The form and number of the cutting heads can be changed according to the specific billet cutting requirements. A single roller cutting head or a single disc cutting head can be used, or a cutting head group composed of them can be used. The cutting head needs to be processed into different sizes to meet the cutting needs according to the cutting of different billets. Since it is necessary to cut hot billets, the cutting head should be processed and made of different steel grades or alloy materials according to the cutting of different billets. The billet cutting machine determines the number of feeds according to the size of the billet. The single feed depth of the cutting head is generally not more than 40mm to prevent the billet from being deformed too much. Through a combination of multiple billet cutting machines or multiple cutting heads, continuous feed cutting in the depth direction is achieved until the billet is cut longitudinally.

[0038] According to the specific needs of cutting the billet, the billet cutting equipment can feed the blade from the top, bottom or left and right sides of the billet to be cut for longitudinal cutting, so that the cut billet is divided into two halves along the longitudinal direction of the billet. It can also feed the blade from the top, bottom, left and right sides of the billet to be cut for longitudinal cutting, so that the cut billet is divided into four strips along the longitudinal direction of the billet.

[0039] The roller conveying system 3 is mainly composed of a discharging roller, a pre-cutting roller, a post-cutting roller, a parallel flow roller and various sections of conveying rollers which are sequentially arranged along the conveying direction.

[0040] The online insulation and temperature compensation system 6 is mainly composed of an insulation cover made of refractory insulation material, an online induction heating device and a temperature detection device. The online induction heating device is interspersed between the various conveying rollers of the roller conveyor system 3, and is used to perform temperature compensation on the small-section steel billets after cutting and opening to be sent to the finishing mill or the finishing mill group 7, so that the temperature of the small-section steel billets meets the conditions for finishing rolling. The temperature detection device performs temperature detection on the inlet and outlet ends of the online induction heating device.

[0041] The billet shaping device 4 after the billet is cut and opened is used to shape the cut billet into a geometric shape of accurate size, so as to reduce the cross-sectional area of ​​the billet for re-cutting. The billet shaping device 4 after the billet is cut and opened is mainly composed of a motor I, a reducer I, a transmission box, a body, a guide and a shaping roller. The working process is to guide the billet after cutting and opening into the shaping device. The surface of the equipment roller is designed with a hole shape. The hole shape design meets the specific billet cutting requirements. After the intermediate metal billet passes through the shaping device, the cross-sectional shape required by the producer can be obtained.

[0042] The finishing mill or finishing mill group 7 is an equipment group composed of various types of finishing mills that are maturely used in steel rolling production lines known at home and abroad.

[0043] The sizing equipment 8 is various forms of saws or shears widely used in current steel rolling production lines. It can be gantry or cantilever type, or a flying shear can be used for sizing. The purpose is to make the intermediate billet or product meet the product length size standard.

[0044] The product cooling and collection equipment 9 is used to cool, collect and package the hot products. According to the requirements of steel product production, it can be a cooling bed, a PF line, a collection rack, a collection tank or other known offline cooling and collection equipment.

[0045] The new steel rolling production line adopting the cutting type blanking method of the present invention can be used to produce round steel, threaded steel, square steel, flat steel, narrow strip steel, bulb flat steel, various steel sections and other steel products.

[0046] The present invention provides a metal rolling production line with energy conservation, environmental protection and superior investment economy. This production line cuts the steel billets heated to the steel rolling temperature into small-section metal billets through a steel billet mechanical cutting and blanking device, thereby achieving the purpose of using only a finishing mill to roll steel products. Since the production line of the present invention does not need to be equipped with a rough rolling mill and an intermediate rolling mill of a traditional steel rolling production line, and only uses a finishing mill, the investment in rolling steel products is greatly reduced, and the production energy consumption is greatly reduced. The production line of the present invention will reduce the electricity consumption per ton of steel by more than 60%, save more than 50% of the floor space of the production line, and reduce the investment in the steel rolling production line with the same production capacity by more than 60%, thus having obvious economic and social benefits.

[0047] Example: A new rebar production line using cutting-type blanking

[0048] The rebar production line using cutting-type billeting is mainly composed of billet heating equipment 1, billet first cutting and billeting equipment 2, roller conveying system 3, billet shaping equipment after billet cutting and billeting 4, second cutting and billeting equipment 5, online insulation and temperature compensation system 6, finishing mill or finishing mill group 7, sizing equipment 8, product cooling and collection equipment 9 and other equipment.

[0049] The raw material steel billet adopts 150mm×150mm continuous casting small square billet with a fixed length of 3m.

[0050] The billet heating equipment 1 adopts a 30th pusher type heating furnace, uses natural gas as fuel, and the average billet temperature out of the furnace is 1150 degrees Celsius.

[0051] The first billet cutting and opening equipment 2 is composed of two groups of billet cutting and opening machine units. The first first cutting machine unit 2-1 is composed of 8 billet cutting and opening machines with upper and lower cutting heads. The first 7 billet cutting and opening machines each have a feed depth of 10mm up and down, and the last billet cutting and opening machine has a total feed depth of 10mm. The first second cutting machine unit 2-2 is composed of 3 billet cutting and opening machines with upper and lower cutting heads. The first 2 billet cutting and opening machines each have a feed depth of 15mm up and down, and the third billet cutting and opening machine has a total feed depth of 10mm. After the billet passes through the first first cutting machine unit 2-1, it is cut into two billets of 70mm×150mm×3300mm respectively. Pushed by the rollers and passing through the limit guide, the two steel billets enter the first and second cutting units 2-2 in turn. After the second cutting, each billet is cut again into two billets of 70mm×70mm×3450mm respectively.

[0052] The cutting speed of the billet first cutting device 2 is 0.3 m / s.

[0053] Furthermore, the 70mm×70mm billet obtained after the first blanking is pushed through a roller and sequentially enters the billet shaping equipment 4 after billet cutting and blanking. The billet shaping equipment 4 after billet cutting and blanking is a shaping equipment with a hole. After the above-mentioned cut 70mm×70mm cross-section billet passes through the shaping equipment, the surface becomes smooth.

[0054] Furthermore, the shaped billet is pushed into the second billet cutting and opening equipment 5 via a roller. The second billet cutting and opening equipment 5 consists of two groups of billet cutting and opening machine units. The second first cutting machine unit 5-1 consists of 4 billet cutting and opening machines with upper and lower cutting heads. The feed depth of each of the first 3 billet cutting and opening machines is 10mm respectively, and the feed depth of the last billet cutting and opening machine is 10mm in total. The second second cutting machine unit 5-2 consists of 2 billet cutting and opening machines with upper and lower cutting heads. The feed depth of each of the first billet cutting and opening machines is 10mm respectively, and the feed depth of the second billet cutting and opening machine is 10mm in total. After passing through the second first cutting machine unit 5-1, the billet is cut into two billets of 32mm×70mm×3700mm respectively. Pushed by the rollers and passing through the limit guide, the two billets enter the second cutting unit 5-2 in turn. After the second cutting, each billet is cut into two billets of 32mm×32mm×4000mm respectively.

[0055] Furthermore, the 32mm×32mm billet is pushed into the online heat preservation and temperature compensation system 6 through the roller table. The heat preservation cover is combined with the temperature compensation system. The cover reduces heat loss and improves energy utilization efficiency. The temperature compensation system ensures that the billet is in the rolling temperature range of 800-950 degrees when entering the finishing mill or finishing mill group 7. The temperature compensation system is provided with temperature compensation by the online induction heating device, and the working and standby states are switched according to the real-time temperature measurement results of the set temperature detection device.

[0056] Furthermore, the 32mm×32mm steel billet in the rolling temperature range is conveyed to the finishing mill through a roller table. The finishing mill consists of 12 finishing mills. The steel billet is rolled through 12 passes to obtain a threaded steel bar with a diameter of 8mm.

[0057] Furthermore, the 8 mm diameter rebar straight bar is sheared to a fixed length of 12 m by the sizing equipment 8 and then conveyed to the cooling bed and collection equipment via a roller conveyor to complete product cooling and packaging, thus completing the entire product production process.

[0058] The new steel rolling production line adopting cutting-type blanking of the present invention is used for rolling various steel products. The steel billet heated to the steel rolling temperature is cut and blanked in a single pass or multiple passes by a specially designed steel billet mechanical cutting device. The large cross-section billet is cut into small cross-section billets by single or multiple cutting and blanking. The small cross-section billets after cutting are then rolled and formed into final steel products by a finishing rolling unit. Compared with the traditional steel rolling production line, the production line of the present invention does not use a rough rolling unit and an intermediate rolling unit, so that the energy consumption of steel rolling production is greatly reduced, and the investment cost of the steel rolling production line is also greatly reduced, so it has good economic and social benefits.

[0059] The above is only a description of the present invention using a specific embodiment, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention description and drawings, which have the features described in the claims, or are directly or indirectly used in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new type of steel rolling production line using cutting type blanking, characterized in that It includes a billet heating device, a billet opening unit connected to the billet heating device, an online heat preservation and temperature compensation system connected to the billet opening unit, a finishing mill or a finishing mill unit connected to the online heat preservation and temperature compensation system, a sizing device connected to the finishing mill or the finishing mill unit, and a product cooling and collecting device connected to the sizing device. The blanking unit includes a first blanking device for cutting and blanking steel billets, a conveying and shaping system connected to the first blanking device, a second blanking device connected to the conveying and shaping system, a conveying and shaping system connected to the second blanking device, and an Nth blanking device connected to the conveying system. The first cutting and opening equipment, the second cutting and opening equipment or the Nth cutting and opening equipment are all composed of a billet cutting type opening machine unit. The billet cutting type opening machine unit includes several billet cutting type opening machines. The billet cutting type opening machine includes a motor, a reducer connected to the motor, a tool rotating shaft group connected to the output shaft of the reducer through a coupling, and a cutting tool group arranged on the tool rotating shaft group. The tool rotating shaft group is arranged in the billet cutting machine frame, and the motor is connected to the electrical control system.

2. The new steel rolling production line using cutting-type blanking according to claim 1 is characterized in that The conveying and shaping system comprises a roller conveying system and a billet shaping device after the billet is cut and opened, which is connected to the roller conveying system.

3. The new steel rolling production line using cutting-type blanking according to claim 1 is characterized in that The tool rotating shaft group comprises an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and the cutting tool group comprises an upper cutting knife which is arranged on the upper rotating shaft and a lower cutting knife which is arranged on the lower rotating shaft respectively.

4. The new steel rolling production line using cutting-type blanking according to claim 1 is characterized in that The tool rotating shaft group comprises a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting tool group comprises a left cutting knife which is arranged on the left rotating shaft and a right cutting knife which is arranged on the right rotating shaft respectively.

5. The new steel rolling production line using cutting-type blanking according to claim 1 is characterized in that The tool rotating shaft group includes an upper rotating shaft and a lower rotating shaft arranged in parallel, and a left rotating shaft and a right rotating shaft arranged in parallel. The cutting tool group includes an upper cutting knife respectively arranged on the upper rotating shaft and a lower cutting knife respectively arranged on the lower rotating shaft, and a left cutting knife respectively arranged on the left rotating shaft and a right cutting knife respectively arranged on the right rotating shaft.

6. The new steel rolling production line using cutting-type blanking according to claim 1 is characterized in that The cutting heads of the cutting tool set are roller cutting heads, disc cutting heads or a combination of roller cutting heads and disc cutting heads. The spacing between each cutting head of the cutting tool set is an adjustable spacing or a fixed spacing.

7. The new steel rolling production line using cutting-type blanking according to claim 2 is characterized in that The roller conveying system is mainly composed of a blank discharging roller, a pre-cutting roller, a post-cutting roller and various sections of conveying rollers which are sequentially arranged along the conveying direction.

8. The new steel rolling production line using cutting-type blanking according to claim 2 is characterized in that The online heat preservation and temperature compensation system is mainly composed of a heat preservation cover made of refractory heat preservation material, an online induction heating device and a temperature detection device. The online induction heating device is interspersed between the conveying rollers of the roller conveying system.

9. The new steel rolling production line using cutting-type blanking according to claim 2 is characterized in that The billet shaping equipment after the billet is cut and opened is mainly composed of a motor I, a reducer I, a transmission box, a machine body, guides and shaping rollers.

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