High-speed wire rod production line with double-U-shaped route arrangement

Abstract

The utility model discloses a double-U-shaped route arrangement high-speed wire rod production line and belongs to the technical field of steel manufacturing. The equipment is sequentially provided with a heating device, a roughing mill unit, an intermediate mill unit, a pre-finishing mill unit, a finishing mill unit, a reducing and sizing mill unit, a cooling water tank, a spinning device, a cooling roller way and a coil collecting device in the rolling direction. Double-U-shaped route arrangement is adopted between a pre-finishing mill set and a reducing and sizing mill set, turning and steering are achieved through a semicircular horizontal loop, and when finishing mills of some specifications do not need to be pressed down, production can be conducted through a second channel in a throwing mode. The double-U-shaped route design is adopted, so that the length of a plant is greatly shortened, the land area is saved, and the investment cost is reduced; and when large-specification finishing mill units which do not pass through the finishing mill units are produced, the finishing mill units can be overhauled, the specifications can be replaced, the production efficiency is improved, and the production organization is more flexible.

Description

Technical Field

[0001] This utility model belongs to the field of steel manufacturing technology, specifically a high-speed wire rod production line with a double U-shaped route layout. Background Technology

[0002] Modern high-speed wire rod production lines are arranged in a linear fashion. After being heated in a furnace, the steel billet enters the first rolling mill via a roller conveyor and then continues linearly. The billet is then spun into coils by a wire spinner, cooled by an air-cooled roller conveyor, and finally coiled into wire rods. This type of production line has a very long plant, which is not conducive to the construction or renovation of production lines for companies with limited open space.

[0003] Chinese patent CN200920063729.8 discloses a multi-channel S-shaped large tray production line with three large trays. Although the production line length is shortened, two routes must pass through two tail trays, which increases the difficulty of control. Moreover, the space requirements of the factory are also different, requiring a large width of the factory in the winding direction. Utility Model Content

[0004] The purpose of this utility model is to provide a high-speed wire rod production line with a double U-shaped route layout, which reduces the total length of the production line, saves land, and facilitates equipment maintenance and specification change.

[0005] The technical solution of this utility model:

[0006] A high-speed wire rod production line with a double-U-shaped route layout is arranged sequentially along the rolling direction, including a heating device, a roughing mill, an intermediate mill, a pre-finishing mill, a semi-circular horizontal looper, a finishing mill, a reducing and sizing mill, a cooling water tank, a wire feeding device, a cooling roller conveyor, and a coil collecting device. The production line is arranged in a double-U shape via the semi-circular looper. The steel output direction from the heating furnace is opposite to the wire feeding direction. A double-U-shaped passage is used between the pre-finishing mill and the reducing and sizing mill; one passage does not pass through the finishing mill, and the other passage does.

[0007] The heating device is a walking beam furnace, which can heat steel billets with cross-sectional dimensions of 150mm×150mm and 180mm×180mm and lengths of 8m to 12.5m. After the steel billets exit the heating furnace, there is a high-pressure water descaling device with a descaling pressure of 0 to 30 MPa. After the descaling device, there is a scrap removal roller conveyor for scrapping the steel billets.

[0008] The roughing mill has 6 short-stress mills divided into two sections, with 1 and 2 as one section. There are pinch rolls in front of 1, and a stripping roller table between 2 and 3. The workpiece is bitten into 3 only after it has completely detached from 2. There are pinch rolls in front of 3. There is a No. 1 flying shear behind the roughing mill.

[0009] The aforementioned intermediate rolling mill has 10 short-stress rolling mills divided into two sections. The first intermediate rolling mill has 6 mills followed by the No. 2 flying shear, and the second intermediate rolling mill has the No. 3 flying shear.

[0010] The pre-finishing mill has four stands, and behind the mill are cooling water tanks No. 1 and No. 2; after cooling water tank No. 2, there are two channels:

[0011] Channel 1 forms a U-shaped route between cooling water tanks 2 and 5. Cooling water tank 3, flying shear 4, semi-circular horizontal looper, 8 stands of finishing mill and cooling water tank 4 are arranged in sequence on the U-shaped route.

[0012] Channel 2 bypasses the finishing mill and forms another U-shaped route between cooling water tank 2 and cooling water tank 5, with a semi-circular horizontal looper arranged there.

[0013] Cooling water tank No. 5, cooling water tank No. 6, flying shear No. 5, 4 reducing and sizing units, cooling water tank No. 7, cooling water tank No. 8, flying shear No. 6;

[0014] The reducing and sizing unit is followed by two cooling water tanks, a flying shear, pinch rollers, and a spinning machine; after spinning is an air-cooled roller conveyor, with a hot-collecting drum in the middle of the roller conveyor for high-temperature winding, and a cold-collecting drum at the end of the roller conveyor for cold winding.

[0015] The beneficial effects of this utility model are as follows: The double U-shaped route design significantly shortens the length of the factory building, saves land area, and reduces investment costs; when producing large specifications without passing through the finishing mill, the finishing mill can be simultaneously inspected and its specifications changed, improving production efficiency and making production organization more flexible. The use of two coil-gathering modes can meet the performance requirements of different varieties, providing a wider process window. Attached Figure Description

[0016] Figure 1 This is a plan view of a high-speed wire rod production line with a double U-shaped route according to the present invention.

[0017] In the diagram: 1-Heating furnace, 2-Descaling device, 3-Scrap removal roller conveyor, 4-Roughing mill stands 1 and 2, 5-De-heading roller conveyor, 6-Roughing mill unit, 7-Flying shear No. 1, 8-Intermediate mill unit, 9-Flying shear No. 2, 10-Intermediate mill unit, 11-Flying shear No. 3, 12-Pre-finishing mill unit, 13-Cooling water tank No. 1, 14-Cooling water tank No. 2, 15-Cooling water tank No. 3, 16-Pinch roll No. 1, 17-Pinch roll No. 2, 18-Flying shear No. 4, 19-Finishing mill unit, 20-Cooling water tank No. 5 Box, 21-6 cooling water tank, 22-5 flying shear, 23-reducing and sizing unit, 24-7 cooling water tank, 25-8 cooling water tank, 26-6 flying shear, 27-spinning machine, 28-air-cooled roller conveyor, 29-hot collector drum, 30-cold collector drum, 31-4 cooling water tank, 32-7 pinch roller, 33-1 semi-circular horizontal looper, 34-2 semi-circular horizontal looper, 35-3 pinch roller, 36-4 pinch roller, 37-5 pinch roller, 38-6 pinch roller. Detailed Implementation Example 1

[0018] Rolling Φ5.5mm spring steel, the continuous casting billet size is 180mm×180mm×9000mm. The rolling process is as follows: 1-Heating furnace—2-Descaling device—3-Scrap removal roller table—16-No. 1 pinch roll—4-Roughing mill No. 1 and No. 2 stands—5-De-heading roller table—17-No. 2 pinch roll—6-Roughing mill—7-No. 1 flying shear—8-Intermediate mill—9-No. 2 flying shear—10-Intermediate mill—11-No. 3 flying shear—12-Pre-finishing mill—13-No. 1 cooling water tank—1 4-2 Cooling water tank — 15-3 Cooling water tank — 36-4 Pinch roll — 33-1 Semi-circular horizontal looper — 37-5 Pinch roll — 18-4 Flying shear — 19 Finishing mill — 38-6 Pinch roll — 31-4 Cooling water tank — 20-5 Cooling water tank — 21-6 Cooling water tank — 23 Reduction and sizing mill — 24-7 Cooling water tank — 25-8 Cooling water tank — 32-7 Pinch roll — 27 Wire spinner — 28 Air-cooled roller table — 30 Cold collection drum Example 2

[0019] Steel for rolling Φ5.5mm alloy welding wire, with a continuous casting billet size of 180mm×180mm×9000mm, is produced via the following rolling process: 1-Heating furnace—2-Descaling device—3-Scrap removal roller conveyor—16-No. 1 pinch roll—4-Roughing mill stands 1 and 2—5-De-heading roller conveyor—17-No. 2 pinch roll—6-Roughing mill—7-No. 1 flying shear—8-Intermediate mill—9-No. 2 flying shear—10-Intermediate mill—11-No. 3 flying shear—12-Pre-finishing mill—13-No. 1 cooling water tank— 14-2 Cooling water tank — 15-3 Cooling water tank — 36-4 Pinch roll — 33-1 Semi-circular horizontal looper — 37-5 Pinch roll — 18-4 Flying shear — 19 Finishing mill — 38-6 Pinch roll — 31-4 Cooling water tank — 20-5 Cooling water tank — 21-6 Cooling water tank — 23 Reduction and sizing mill — 24-7 Cooling water tank — 25-8 Cooling water tank — 32-7 Pinch roll — 27 Wire spinner — 28 Air-cooled roller table — 29 Hot collector drum Example 3

[0020] For rolling Φ25mm cold heading steel, the continuous casting billet size is 150mm×150mm×12000mm. The rolling process is as follows: 1-Heating furnace—2-Descaling device—3-Scrap removal roller table—16-No. 1 pinch roll—4-Roughing mill No. 1 and No. 2 stands—5-De-heading roller table—17-No. 2 pinch roll—6-Roughing mill—7-No. 1 flying shear—8-Intermediate mill—9-No. 2 flying shear—10-Intermediate mill—11-No. 3 flying shear— 12-Pre-finishing mill unit—13-No. 1 cooling water tank—14-No. 2 cooling water tank—35-—34-No. 2 semi-circular horizontal looper—38-No. 6 pinch roll—31-No. 4 cooling water tank—20-No. 5 cooling water tank—21-No. 6 cooling water tank—23-Sizing and reducing mill unit—24-No. 7 cooling water tank—25-No. 8 cooling water tank—32-No. 7 pinch roll—27-Wire drawing machine—28-Air-cooled roller table—30-Cold collecting drum.

Claims

1. A high speed wire rod production line with a double U-shaped route arrangement, characterized in that: The production line is arranged in sequence along the rolling direction, including heating device, roughing mill, intermediate mill, pre-finishing mill, semi-circular horizontal looper, finishing mill, sizing mill, cooling water tank, wire feeding device, cooling roller conveyor, and coil collecting device. The production line is arranged in a double U-shape through the semi-circular looper. The steel output direction of the heating furnace is opposite to the wire feeding direction. A double U-shaped channel is used between the pre-finishing mill and the sizing mill. One channel does not pass through the finishing mill, and the other channel passes through the finishing mill.

2. A high speed wire rod production line with a double U-shaped layout according to claim 1, characterized in that: The heating device is a walking beam furnace. After the steel billet exits the furnace, there is a high-pressure water descaling device; after the descaling device, there is a scrap removal roller conveyor to remove scrap from the steel billet.

3. A high speed wire rod production line with a double U-shaped layout according to claim 1, characterized in that: The roughing mill has 6 short-stress mills divided into two sections, with mills 1 and 2 forming one section. Mill 1 has pinch rolls in front of it, and mills 2 and 3 have a stripping roller table. The workpiece is only bitten into mill 3 after it has completely detached from mill 2. Mill 3 has pinch rolls in front of it. There is a No. 1 flying shear after the roughing mill. The intermediate mill has 10 short-stress mills divided into two sections. There is a No. 2 flying shear after the 6 mills in the first intermediate mill and a No. 3 flying shear after the second intermediate mill. The pre-finishing mill has 4 mills, and there are two cooling water tanks, No. 1 and No. 2, after the pre-finishing mill.

4. A high-speed wire rod production line with a double U-shaped route layout according to claim 3, characterized in that: After cooling water tank No. 2, there are two channels: Channel 1 forms a U-shaped route between cooling water tanks No. 2 and No. 5, and cooling water tank No. 3, flying shear No. 4, semi-circular horizontal looper, and 8 stands of finishing mill are arranged in sequence on the U-shaped route, as well as cooling water tank No. 4; Channel 2 bypasses the finishing mill and forms another U-shaped route between cooling water tanks No. 2 and No. 5, and semi-circular horizontal looper is arranged there.

5. A high speed wire rod production line with a double U-shaped layout according to claim 1, characterized in that: Two cooling water tanks, a flying shear, pinch rollers, and a spinning machine are arranged after the sizing and reducing unit; after spinning is a cooling roller table, with a hot-collecting drum in the middle of the roller table for high-temperature winding, and a cold-collecting drum at the end of the roller table for cold winding.

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