A device for preventing strip steel from being unsheathed and its continuous casting and rolling production line

Abstract

The utility model discloses a device for preventing strip steel from being unhooked and a continuous casting and rolling production line thereof, belonging to the field of steel production, comprising a lifting device arranged between a layer cooling unit and a high-speed flying shear; the lifting device comprises a conveying roller, a roller frame and a hydraulic cylinder. The utility model can reduce the risk of unhooking of soft steel at the coiling position and reduce the failure time caused by unhooking at the coiling position.

Description

Technical Field

[0001] The utility model relates to a steel production line, in particular to a device for preventing the casing from being unfastened when a continuous casting and rolling production line produces strip steels of multiple specifications. Background Art

[0002] In the prior art, the strip steel continuous casting and rolling production line mainly includes continuous casting unit, rough rolling unit, induction heating furnace, finishing rolling unit, layer cooling unit, high-speed flying shear, down coiler, etc. When producing thin strip steel, the strip steel speed is relatively fast. When the running speed of the coiler cannot keep up with the speed of the strip steel, it is easy to get loose at the coiling position. In serious cases, it will cause the production line to stop production or even stop casting unplanned, which will seriously affect the production rhythm and production efficiency.

[0003] The current solution to this problem is to reduce the continuous casting speed when producing thin-gauge strip steel, so as to avoid the mismatch between the strip speed and the coiling speed of the coiler. For example, in "A control method for hot-rolled thin-gauge strip steel and its laminar cooling and sheathing" (CN202311228527.5): the rough rolling adopts the 1+5 mode for production organization, and the rolling mill is controlled to automatically reduce the speed after the finishing rolling is completed. Or realize speed change: "A method for eliminating the sheathing of thin-gauge strip steel on the layer cold roller" (CN201110280742.0) sets the lead rate of the first group of rollers of the layer cold roller to be greater than 4%; the lead rate between the next group of rollers and the previous group of rollers of the layer cold roller is set to be greater than the acceleration rate between the next group of rollers and the previous group of rollers + (the set value of the linear speed of the layer cold roller - the actual value of the linear speed of the layer cold roller); before the coiler is loaded, the thin-gauge strip steel is allowed to move forward at a uniform speed on the layer cold roller, and after the coiler is loaded, the thin-gauge strip steel is allowed to move forward at a uniform acceleration on the layer cold roller. However, the above method will cause the final rolling temperature at the F5 exit to be low and the temperature rate in the cooling stage to change, which will have an adverse effect on the performance of the strip.

[0004] In addition, the existing methods for reducing strip steel sleeves are all aimed at a single specification. When switching between thick and thin specifications, the above adjustment method often causes the transition section to have unstable strip steel performance due to changes in pulling speed and temperature.

[0005] Therefore, there is an urgent need for a method and device for controlling the starting of multiple-specification strip steels in a continuous casting and rolling production line. Utility Model Content

[0006] The technical task of the utility model is to address the deficiencies of the above-mentioned existing technologies and provide a device to prevent the strip from being sheared. The device passes through the continuous casting and rolling production line before the high-speed flying shear, and utilizes the decrease in the deadweight of the steel coil to absorb the shearing caused by the mismatch between the coiling speed and the strip speed when producing thin-gauge strips. At the same time, the height of the descent is controlled to avoid the surface yielding of the strip and the generation of transverse fold defects.

[0007] The utility model solves the technical problem through a technical solution: a device for preventing strip steel from being unsheathed, characterized in that: it comprises a lifting device arranged between a layer cooling unit and a high-speed flying shear; the lifting device comprises a conveying roller, a roller frame and a hydraulic cylinder; the top of the hydraulic cylinder is fixedly connected to the roller frame; there are a plurality of conveying rollers, and both ends of the conveying rollers are rotatably connected to the roller frame; when the hydraulic cylinder is in a raised state, the conveying rollers of the lifting device and the conveying rollers of the layer cooling are in the same plane and are arranged in parallel.

[0008] The hydraulic cylinder is fixedly connected to the roller frame via a receiving platform.

[0009] The width of the above lifting device is 6m and the maximum descending depth is 7m.

[0010] It also includes a continuous casting unit, a rough rolling unit, an induction heating furnace, a finishing rolling unit, a layer cooling unit, a high-speed flying shear, and a coiler; after the layer cooling unit and before the high-speed flying shear, it also includes a lifting device.

[0011] The lifting device comprises a conveying roller, a roller frame and a hydraulic cylinder; the top of the hydraulic cylinder is fixedly connected to the roller frame; there are multiple conveying rollers, and both ends of the conveying rollers are rotatably connected to the roller frame; when the hydraulic cylinder is in the raised state, the conveying rollers of the lifting device and the conveying rollers of the layer cooling are in the same plane and are arranged in parallel.

[0012] Compared with the prior art, the utility model has the following outstanding beneficial effects:

[0013] 1. The utility model can reduce the risk of soft steel coiling at the coiling position, reduce the failure time caused by coiling at the coiling position, ensure stable production, and reduce the production cost of thin-gauge strip steel;

[0014] 2. Removed a limiting factor in the downward exploration of strip steel specifications, broadened the limit specifications of continuous casting and rolling strip steel products, and further improved the industry competitiveness of the production line;

[0015] 3. When switching between multiple specifications, there is no change in the designed pulling speed and temperature, and the performance of the strip in the transition section is unstable;

[0016] 4. Simple structure, easy maintenance and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the thick specification production structure of the production line of the utility model.

[0018] Figure 2 It is a schematic diagram of the thin-gauge production structure of the production line of the utility model.

[0019] Figure 3 It is a schematic diagram of the lifting device of the utility model in the raised state.

[0020] Figure 4 It is a schematic diagram of the descending state of the lifting device of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] For the purpose of the following detailed description, it should be understood that, unless explicitly indicated to the contrary, the present invention may take various alternative variations and step orders. In addition, except in any operating examples or where otherwise indicated, all numbers representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. At least, and without attempting to limit the application of the principle of equivalents to the scope of the claims, each numerical parameter should at least be understood according to the number of reported significant digits and by applying ordinary rounding techniques.

[0023] While the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0024] It should also be understood that any numerical range stated herein is intended to include all subranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the stated minimum value of 1 and the stated maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.

[0025] In this application, unless otherwise specifically stated, the use of the singular includes the plural and the plural includes the singular. In addition, in this application, unless otherwise specifically stated, the use of "or" means "and / or", even if "and / or" may be explicitly used in some cases. Further, in this application, unless otherwise specifically stated, the use of "a" or "an" means "at least one / kind". For example, "a" first material, "a" coating composition, etc. refer to one or more items in any of these items.

[0026] like Figures 1 to 4 As shown, the utility model provides a device for preventing strip steel from being unsheathed, comprising a lifting device 6 arranged between a layer cooling unit 5 and a high-speed flying shear 7.

[0027] The lifting device 6 includes a conveying roller 61 , a roller frame 64 and a hydraulic cylinder 63 .

[0028] The top of the hydraulic cylinder 63 is fixedly connected to the roller frame 64 . In this embodiment, the hydraulic cylinder 63 is fixedly connected to the roller frame 64 via the receiving platform 62 .

[0029] There are multiple conveying rollers 61, and both ends of the conveying rollers 61 are rotatably connected to the roller frame 64. The structure and power transmission method of the conveying rollers and the roller frame are prior art and will not be described here.

[0030] When the hydraulic cylinder 63 is in the raised state, the conveying roller 61 of the lifting device and the conveying roller of the layer cooling are in the same plane and are arranged in parallel.

[0031] A continuous casting and rolling production line for preventing the strip from being sloughed with multiple specifications of steel strips comprises a continuous casting unit 1, a rough rolling unit 2, an induction heating furnace 3, a finishing rolling unit 4, a layer cooling unit 5, a high-speed flying shear 7, and a coiler 8. After the layer cooling unit 5 and before the high-speed flying shear 7, a lifting device 6 is also included, which controls the lifting height and uses the weight of the steel strip to absorb the sloughing amount generated by the steel strip during the production process, thereby avoiding yielding of the steel strip surface and preventing the generation of transverse fold defects.

[0032] The specific usage is:

[0033] 1. When pouring

[0034] When pouring begins, the lifting device 6 is in a raised state, and the conveying roller 61 of the lifting device 6 is in the same plane as the conveying roller of the layer cooling. At this time, the strip steel can smoothly pass through the lifting device to complete the steel feeding.

[0035] 2. Thick gauge production

[0036] like Figure 1 , 3 As shown, the lifting device 6 is in a raised state, and the conveying roller 61 of the lifting device 6 is in the same plane as the conveying roller of the layer cooling.

[0037] 3. Thin gauge production

[0038] Before the transition to thin gauge, the lifting device is always in the raised state. After the transition to thin gauge, such as Figure 2 , 4 As shown, the lifting device 6 descends, and the plane where the conveying roller 61 of the lifting device is located is lower than the plane where the conveying roller of the layer cooling is located; the local roller table descends, so that part of the strip steel is in a suspended state. When the strip steel in front of the coiler tends to be unwound, this part of the suspended strip steel can absorb the wrapping amount to avoid unwounding.

[0039] In this embodiment, the width of the lifting device is 6m, and the maximum descending depth is 7m.

[0040] 4. When casting tail

[0041] When the strip is thrown away at the rear, in order to avoid tail swinging, the lifting device 6 is in a raised state to allow the strip to be thrown away smoothly.

[0042] The method of the utility model can reduce the risk of coiling of soft steel at the coiling position, reduce the failure time caused by coiling at the coiling position, ensure stable production, and reduce the production cost of thin-gauge strip steel; eliminate the limiting factor of the downward exploration of strip steel specifications, broaden the limit specifications of continuous casting and rolling strip steel products, and further improve the industry competitiveness of the production line; when switching between multiple specifications, there will be no changes in the designed pulling speed and temperature, and the performance of the transition section strip steel will be unstable.

[0043] It should be noted that the specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes to the present invention without departing from the spirit and scope of the present invention are within the protection scope of the present invention.

Claims

1. A device for preventing strip steel from being unsheathed, characterized in that: It includes a lifting device arranged between the layer cooling unit and the high-speed flying shear; the lifting device includes a conveying roller, a roller frame and a hydraulic cylinder; The top of the hydraulic cylinder is fixedly connected to the roller frame; There are multiple conveying rollers, and both ends of the conveying rollers are rotatably connected to the roller frame; When the hydraulic cylinder is in the raised state, the conveying roller of the lifting device and the conveying roller of the layer cooling are in the same plane and are arranged in parallel.

2. The device for preventing strip steel from being unsheathed according to claim 1, characterized in that: The hydraulic cylinder is fixedly connected to the roller frame via a receiving platform.

3. The device for preventing strip steel from being unsheathed according to claim 1, characterized in that: The width of the lifting device is 6m, and the maximum descending depth is 7m.

4. A continuous casting and rolling production line for avoiding strip steel unpacking, characterized in that: It includes a continuous casting unit, a rough rolling unit, an induction heating furnace, a finishing rolling unit, a layer cooling unit, a high-speed flying shear, and a coiler; after the layer cooling unit and before the high-speed flying shear, it also includes a lifting device.

5. The continuous casting and rolling production line for avoiding strip steel unpacking according to claim 4, characterized in that: The lifting device includes a conveying roller, a roller frame and a hydraulic cylinder; the top of the hydraulic cylinder is fixedly connected to the roller frame; there are multiple conveying rollers, and both ends of the conveying rollers are rotatably connected to the roller frame; when the hydraulic cylinder is in a raised state, the conveying rollers of the lifting device and the conveying rollers of the layer cooling are in the same plane and are arranged in parallel.

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