A high-speed sheet passing method, device and strip production line

Abstract

The present invention relates to a high-speed sheet passing method, device and strip steel production line, belonging to the technical field of metal rolling. A low-pressure chamber with an internal air pressure lower than the external ambient air pressure is arranged between the high-speed flying shear and the coiler in the strip steel continuous casting and rolling production line, so as to reduce the air flow resistance during the strip steel traveling process, thereby improving the stability of the strip steel traveling process and the success rate of threading, reducing the product waste loss caused by production accidents, thus improving the metal yield, and comprehensively improving the production efficiency and economic benefits of the production line.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal rolling, and relates to a high-speed sheet passing method, device and strip production line. Background Art

[0002] The short-process continuous casting and rolling is a technology successfully developed in the late 1980s of the 20th century. After converter steelmaking and full continuous casting, it is another revolutionary technology in the field of iron and steel metallurgy, leading the development direction of steel manufacturing technology. Its successful development realizes the organic combination of thin-gauge slab continuous casting and hot continuous rolling, and is a major breakthrough in near-net shape manufacturing technology. The short-process continuous casting and rolling production technology is not only very beneficial to the construction of an energy-saving and environment-friendly society, but as the development trend of future iron and steel metallurgy technology, its more prominent advantage compared with traditional hot continuous rolling is that the short-process continuous casting and rolling technology can produce thin-gauge strip steel that is difficult to produce by traditional hot continuous rolling. This benefits from the endless or semi-endless production process of the short-process continuous casting and rolling technology, which avoids the threading process with the highest failure rate during single-piece rolling in conventional hot continuous rolling, and significantly improves the rolling stability compared with conventional hot continuous rolling.

[0003] During the endless or semi-endless production of short-process continuous casting and rolling, the strip steel passes through the finishing mill and is cooled to the target temperature through laminar cooling control. After being sheared by the shearing machine, it is introduced into different coiling machines to achieve high-speed splitting coiling. The head of the next strip steel runs through the shearing machine to the coiling machine for threading and coiling. Due to the characteristics of the short-process continuous casting and rolling production line, which is the production of ultra-thin gauge strip steel, and in recent years, with the continuous breakthrough of high casting speed continuous casting technology, the production speed of the rolling line has also been continuously increasing. During the process of the strip steel head running to the coiling machine after being sheared by the shearing machine, problems such as the strip steel soaring, stacking and winding are extremely likely to occur, causing the production line to stop due to accidents, resulting in a decline in economic benefits and production capacity.

[0004] In response to this problem, patent documents such as CN102421545A, CN1239447A, CN101678420A, CN1671491A, etc. have all proposed their respective solutions, but from the application effects, the problem has not been effectively solved. In addition, with the progress of production technology, the casting speed and thickness of continuous casting billets have been continuously broken through. Coupled with the higher requirements of the downstream market for ultra-thin and extremely thin gauge products in the trend of replacing cold with hot, the strip steel thickness has been continuously reduced, and the production line speed has been continuously increased. The problems such as the strip steel head soaring, stacking and winding during threading have become more prominent, and the production line failures have increased, which has become a major bottleneck restricting the efficient production of ultra-thin strip steel. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a high-speed sheet passing method, device and strip production line to solve the problems of strip steel soaring, stacking and winding caused by the speed difference between the head and the subsequent parts during threading.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for high-speed sheet passing, in which a low-pressure chamber with an internal air pressure lower than the external ambient air pressure is arranged between the high-speed flying shear and the coiler in a strip continuous casting and rolling production line to reduce the air flow resistance during the strip traveling process.

[0008] Optionally, the air pressure in the low-pressure chamber is set in sections, at least 3 sections, decreasing first and then increasing along the strip conveying direction.

[0009] Optionally, the internal pressures at the inlet end and the outlet end of the low-pressure chamber are 10 5 Pa to 10 2 Pa, and the internal pressure in the middle of the low-pressure chamber is 10 5 Pa to 10 -2 Pa.

[0010] Optionally, when there are multiple coilers, low-pressure chambers are also arranged between the coilers.

[0011] A high-speed sheet passing device, including an inlet chamber, a body chamber, and an outlet chamber arranged in sequence along the strip conveying direction, the air pressure in each chamber decreasing first and then increasing and being lower than the external ambient air pressure along the strip conveying direction; narrow slits are provided at the positions of each chamber corresponding to the strip to allow the strip to pass through.

[0012] Optionally, sealing devices are provided at the positions of each chamber corresponding to the strip, and the sealing devices are provided with narrow slits to allow the strip to pass through.

[0013] Optionally, each chamber is connected with a air pressure regulating device.

[0014] Optionally, the length of the body chamber is greater than the lengths of the inlet chamber and the outlet chamber.

[0015] Optionally, the inlet chamber is one chamber or composed of multiple sub-chambers connected in sequence. When the inlet chamber includes multiple sub-chambers, the air pressure in each sub-chamber of the inlet chamber gradually decreases along the strip conveying direction.

[0016] Optionally, the body chamber is one chamber or composed of multiple sub-chambers connected in sequence. When the body chamber includes multiple sub-chambers, the air pressure in each sub-chamber of the body chamber is the same along the strip conveying direction.

[0017] Optionally, the outlet chamber is one chamber or composed of multiple sub-chambers connected in sequence. When the outlet chamber includes multiple sub-chambers, the air pressure in each sub-chamber of the outlet chamber gradually increases along the strip conveying direction.

[0018] A strip production line includes a slab rolling unit, a high-speed flying shear, and a coiling unit arranged in sequence along the rolling direction. A high-speed strip passing device as described above is provided between the high-speed flying shear and the coiling unit.

[0019] Optionally, the coiling unit includes at least two coiling machines, and a high-speed strip passing device is also provided between adjacent coiling machines.

[0020] The beneficial effects of the present invention are as follows:

[0021] By providing a low-pressure chamber with an internal air pressure lower than the external ambient air pressure between the high-speed flying shear and the coiling machine in the strip continuous casting and rolling production line, when the strip is switched during coiling, when the head of the strip after being sheared by the high-speed flying shear warps or floats during high-speed travel due to external factors, the head speed decreases under the air flow resistance, resulting in a speed difference between the head and the subsequent part of the strip, causing accidents such as the strip taking off, stacking, and winding. Therefore, the present invention can enable the head of the strip to quickly and successfully pass through the strip, reduce production accidents caused by failed strip passing, thereby reducing the downtime of the production line, improving the productivity of the production line; reducing equipment damage caused by production accidents, and extending the service life of the equipment; also reducing the loss of product waste caused by production accidents, thereby improving the metal yield rate, and comprehensively improving the production efficiency and economic benefits of the production line.

[0022] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in preferred detail below with reference to the accompanying drawings, where:

[0024] Figure 1 is the layout schematic diagram of Embodiment 1 of the present invention;

[0025] Figure 2 is the structural schematic diagram of the high-speed strip passing device in Embodiment 1;

[0026] Figure 3 is the layout schematic diagram of Embodiment 2 of the present invention.

[0027] Reference numerals: high-speed strip passing device 1, rolling unit 2, high-speed flying shear 3, coiling unit 4, strip 5, inlet chamber 101, body chamber 102, outlet chamber 103, cavity 1001, conveying roller table 1002, sealing device 1003, air pressure regulating device 1004, pinch roll 301, first coiling machine 401. Detailed implementation manners

[0028] The following uses specific specific examples to illustrate the implementation manners 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 implementation manners. Various details in this specification can also 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 drawings provided in the following embodiments only schematically illustrate the basic concept of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] In the 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 there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Please refer to Figures 1 to 3 , a method for high-speed strip passing. A low-pressure chamber with an internal air pressure lower than the external ambient air pressure is arranged between the high-speed flying shear 3 and the coiler in a strip continuous casting and rolling production line to reduce the air flow resistance during the progress of the strip 5.

[0032] By arranging a low-pressure chamber with an internal air pressure lower than the external ambient air pressure between the high-speed flying shear 3 and the coiler in the strip continuous casting and rolling production line, the present invention reduces the sum of acting forces such as air flow resistance, gravity, and impact force during the forward movement of the strip 5 on the progress of the strip 5, thereby improving the stability of the strip 5 during the progress and the success rate of threading, reducing the product scrap loss caused by production accidents, thereby improving the metal yield, and comprehensively improving the production efficiency and economic benefits of the production line.

[0033] Optionally, the air pressure in the low-pressure chamber is set in sections, at least 3 sections, decreasing first and then increasing along the strip conveying direction; the internal pressures at the inlet end and the outlet end of the low-pressure chamber are 10 5 Pa to 10 2 Pa, and the internal pressure in the middle of the low-pressure chamber is 10 5 Pa to 10 -2 Pa; when there are multiple coiling machines, low-pressure chambers are also provided between the coiling machines.

[0034] A high-speed strip passing device 1 includes an inlet chamber 101, a main body chamber 102, and an outlet chamber 103 arranged in sequence along the strip conveying direction. The air pressure in each chamber decreases first and then increases along the strip conveying direction and is lower than the external ambient air pressure.

[0035] Optionally, narrow slits are provided at the positions of the strip 5 corresponding to each chamber to allow the strip to pass through; sealing devices 1003 are provided at the positions of the strip 5 corresponding to each chamber, and the sealing devices 1003 are provided with narrow slits to allow the strip 5 to pass through; each chamber is connected with a air pressure regulating device 1004; the inlet chamber 101 is one chamber or composed of multiple sequentially connected sub-chambers. When the inlet chamber 101 includes multiple sub-chambers, the air pressure of each sub-chamber of the inlet chamber 101 gradually decreases along the strip 5 conveying direction; the length of the main body chamber 102 is greater than the lengths of the inlet chamber 101 and the outlet chamber 103; the main body chamber 102 is one chamber or composed of multiple sequentially connected sub-chambers. When the main body chamber 102 includes multiple sub-chambers, the air pressure of each sub-chamber of the main body chamber 102 is the same along the strip 5 conveying direction; the outlet chamber 103 is one chamber or composed of multiple sequentially connected sub-chambers. When the outlet chamber 103 includes multiple sub-chambers, the air pressure of each sub-chamber of the outlet chamber 103 gradually increases along the strip 5 conveying direction.

[0036] A strip 5 production line includes a slab rolling unit 2, a high-speed flying shear 3, and a coiling unit 4 arranged in sequence along the rolling direction. A high-speed strip passing device 1 as described above is provided between the high-speed flying shear 3 and the coiling unit 4; when the coiling unit 4 includes at least two coiling machines, a high-speed strip passing device 1 is also provided between adjacent coiling machines.

[0037] Example 1

[0038] Such as Figure 1 And Figure 2As shown in the figure, a high-speed strip passing device 1 is applied to a continuous casting and rolling production line and is arranged between a high-speed flying shear 3 and a coiler 4. The device is composed of an inlet chamber 101, a main body chamber 102, and an outlet chamber 103. Each chamber of the high-speed strip passing device 1 is respectively composed of a cavity 1001, an internal conveying roller table 1002, a sealing device 1003, and a pneumatic pressure regulating device 1004. The positions corresponding to the strip steel in the inlet chamber 101 and the outlet chamber 103 are sealed by sealing devices. The sealing device is provided with a narrow slit allowing the strip steel to pass through, and the horizontal position of the narrow slit matches the height of the conveying roller table. Among them, the air pressure relationship of each part is: external ambient air pressure > internal pressure of the inlet (outlet) chamber ≥ internal pressure of the main body chamber. When the shearing machine 3 shears the strip steel, the leading end starts threading. When the leading end enters the inlet chamber 101 of the high-speed strip passing device 1 from the outlet of the pinch roll 301 of the high-speed flying shear 3, the air pressure in the inlet chamber is much lower than the external air pressure, and the leading end will not become unstable due to air flow disturbance; then the leading end enters the main body chamber 102, and the air pressure in the main body chamber is in the air pressure region from low vacuum to high vacuum. Even if the leading end hits the roller table due to the height difference of the roller table or the leading end warps due to its own shape defect of the strip, there will be no phenomenon of the leading end floating due to air flow resistance. The leading end in the vacuum environment can maintain stable travel and finally successfully thread to the coiler.

[0039] Embodiment 2

[0040] As Figure 3 shown, compared with Embodiment 1, in Embodiment 2, a high-speed strip passing device is also provided between the coiler 401 and the coiler 402.

[0041] 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 them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A method for high-speed passing of a plate, characterized in that: A low-pressure chamber with an internal air pressure lower than the external ambient air pressure is provided between the high-speed flying shear and the coiler in a strip continuous casting and rolling production line to reduce the air flow resistance during the strip's travel; The air pressure in the low-pressure chamber is set in sections, at least 3 sections, decreasing first and then increasing along the strip conveying direction; The internal pressures at the inlet end and the outlet end of the low-pressure chamber are 10 5 Pa to 10 2 Pa, and the internal pressure in the middle of the low-pressure chamber is 10 5 Pa to 10 -2 Pa.

2. The method for high-speed passing of a board according to claim 1, characterized in that: When there are multiple coilers, low-pressure chambers are also provided between the coilers.

3. A high-speed board passing device, characterized in that: It includes an inlet chamber, a main body chamber, and an outlet chamber arranged sequentially along the strip conveying direction. The air pressure in each chamber decreases first and then increases along the strip conveying direction and is lower than the external ambient air pressure; narrow slits are provided at the positions of the strip corresponding to each chamber to allow the strip to pass through; The inlet chamber is one chamber or composed of multiple sequentially connected sub-chambers. When the inlet chamber includes multiple sub-chambers, the air pressure of each sub-chamber of the inlet chamber decreases gradually along the strip conveying direction; the main body chamber is one chamber or composed of multiple sequentially connected sub-chambers. When the main body chamber includes multiple sub-chambers, the air pressure of each sub-chamber of the main body chamber is the same along the strip conveying direction; the outlet chamber is one chamber or composed of multiple sequentially connected sub-chambers. When the outlet chamber includes multiple sub-chambers, the air pressure of each sub-chamber of the outlet chamber increases gradually along the strip conveying direction.

4. The high-speed board passing device according to claim 3, characterized in that: Each chamber is connected with an air pressure regulating device.

5. The high-speed board passing device according to claim 3, characterized in that: The length of the main body chamber is greater than the lengths of the inlet chamber and the outlet chamber.

6. A strip production line, comprising a slab rolling unit, a high-speed flying shear, and a coiling unit sequentially arranged along the rolling direction, characterized in that: A high-speed strip-passing device as described in any one of claims 3 to 5 is provided between the high-speed flying shear and the coiler unit.

7. The strip production line according to claim 6, characterized in that: The coiler unit includes at least two coilers, and a high-speed strip-passing device is also provided between adjacent coilers.

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