A heating device for the edge of aluminum sheet and foil

Abstract

This application provides an edge heating device for aluminum sheet, strip, and foil, relating to the field of metal material processing technology. It includes: a support bracket straddling the entrance side of a primary rolling mill; two sets of infrared heaters arranged vertically at intervals; each set of infrared heaters has two infrared radiators, with the two radiators in the same set respectively used to heat the edge regions on both sides of the same billet; an adjustment mechanism for adjusting the spacing between the two infrared radiators in the same set; and a nitrogen purging mechanism for generating a nitrogen curtain, the angle α between the nitrogen curtain and the direction of movement of the billet satisfying 0° < α < 45°; the infrared rays generated by the infrared radiators pass through the nitrogen curtain and directly act on the edge regions of the billet. This application only heats the edge regions of the billet, which have a small area and low energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of metal material processing technology, and in particular to a heating device for the edge of aluminum sheet and foil. Background Technology

[0002] Aluminum sheet, strip, and foil, as lightweight metallic materials, have wide applications in electronics, packaging, aerospace, and other fields. During the rolling process of aluminum sheet, strip, and foil, the billet undergoes homogenization heating (to improve metal plasticity and reduce deformation resistance) before being rolled in a primary rolling mill (a four-high reversible rolling mill). However, when rolling thin aluminum sheet, strip, and foil (thickness 0.8mm–2.5mm), the primary rolling mill experiences rapid temperature drops at the edges and significant differences in lateral metal flowability, easily leading to sheet shape defects such as edge waviness and center waviness.

[0003] To address the above situation, the billet is usually reheated before entering the primary rolling mill to compensate for the temperature drop in the edge region (which accounts for 10% to 20% of the billet width). However, the middle region of the billet does not need to be reheated before entering the primary rolling mill (which accounts for 60% to 80% of the billet width and has a slower temperature drop), which results in high energy consumption.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] In view of the above situation, this utility model provides an edge heating device for aluminum sheet and foil, which aims to solve the technical problem of high energy consumption in the current method of overall heating before the billet enters the primary rolling device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a heating device for the edge of aluminum sheet and foil, comprising:

[0008] The support frame is installed across the inlet side of the primary rolling unit;

[0009] Two sets of infrared heaters are arranged vertically at intervals; each set of infrared heaters has two infrared radiators, and the two infrared radiators in the same set are used to heat the two side edge areas of the same billet respectively.

[0010] An adjustment mechanism for adjusting the spacing between two infrared radiators in the same group;

[0011] A nitrogen purging mechanism is used to generate a nitrogen curtain, wherein the angle α between the nitrogen curtain and the movement direction of the billet satisfies 0° < α < 45°; the infrared rays generated by the infrared radiator pass through the nitrogen curtain and act directly on the edge area of ​​the billet.

[0012] In some embodiments of this utility model, the adjustment mechanism includes a suspension frame and a drive assembly; the suspension frame is installed on the upper part of the support bracket and is used to suspend the infrared radiator; the drive assembly is installed on the support bracket and is used to move the suspension frame along the width direction of the blank.

[0013] In some embodiments of this utility model, the drive assembly includes a servo motor, a ball screw, and a slider; the ball screw is connected to the output end of the servo motor, and the slider is threadedly connected to the ball screw.

[0014] In some embodiments of this utility model, the nitrogen purging mechanism includes:

[0015] An air collection box is installed on the support bracket, and the air collection box has an air inlet.

[0016] The jet heads, a plurality of which are arranged in the lower part of the gas collection box and located directly above the edge region of the billet.

[0017] In some embodiments of this utility model, the support bracket is equipped with a support rod, the air collection box has a connecting lug, the connecting lug is rotatably connected to the support rod, and a fastening nut is threaded onto the connecting lug, one end of the fastening nut being able to abut against the support rod.

[0018] In some embodiments of this invention, the outlet of the jet head is gradually widened.

[0019] In some embodiments of this utility model, a nitrogen heating mechanism is also included, which is used to heat the nitrogen entering the gas collection box.

[0020] In some embodiments of this utility model, the nitrogen heating mechanism includes:

[0021] The heat exchanger has a nitrogen inlet, a nitrogen outlet, a hot gas inlet, and a hot gas outlet; the nitrogen inlet and the nitrogen outlet are connected by a spiral pipe; the nitrogen outlet is connected to the gas inlet port.

[0022] The blower's outlet is connected to the heater's inlet;

[0023] A heater, the outlet of which is connected to the hot gas inlet.

[0024] The embodiments of this utility model have at least the following advantages or beneficial effects:

[0025] 1. Only the edge area of ​​the billet is heated. The edge area is small, so the heating energy consumption is low.

[0026] 2. The distance between the two sets of infrared radiators can be adjusted by adjusting the mechanism, thereby adjusting the coverage of the infrared radiators on the edge area to adapt to the heating needs of edge areas of different sizes under different working conditions.

[0027] 3. The nitrogen curtain generated by the nitrogen purging mechanism can reduce the oxygen content in the heated edge area to inhibit oxidation, and guide and carry the hot gas generated by heating away from the stand of the primary rolling unit to prevent the stand from overheating.

[0028] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the heating device for the edge of aluminum sheet foil.

[0031] Figure 2 for Figure 1 The left view;

[0032] Figure 3 for Figure 1 A magnified view of a portion of position A in the middle;

[0033] Figure 4 for Figure 2 A magnified view of the area at position B in the middle.

[0034] icon:

[0035] 1-Support bracket,

[0036] 2-Infrared radiator,

[0037] 31-Suspension bracket, 32-Servo motor, 33-Ball screw, 34-Slider,

[0038] 41-Nitrogen curtain, 42-Support rod, 43-Gas collection box, 431-Air inlet, 44-Jet nozzle, 45-Connecting lug, 46-Fasting nut

[0039] 51-Heat exchange box, 511-Nitrogen inlet, 512-Nitrogen outlet, 513-Hot gas inlet, 514-Hot gas outlet, 515-Spiral pipe, 516-Hose, 52-Blower, 53-Heater. Detailed Implementation

[0040] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention.

[0041] In the description of the embodiments of this utility model, it should be understood that the terms "width", "thickness", "upper", "lower", "right", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0042] Furthermore, the term "multiple" means two or more, unless otherwise explicitly specified.

[0043] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0044] The embodiments of this utility model will be described in detail below.

[0045] See Figures 1-4 This embodiment provides an edge heating device for aluminum sheet, strip, and foil, which is installed near the entrance of a four-roll reversible rolling mill and is used to heat the edge area of ​​the billet. The edge heating device for aluminum sheet, strip, and foil includes: a support bracket 1, an infrared heater 53, an adjustment mechanism, and a nitrogen purging mechanism.

[0046] The support bracket 1 is shaped like a "Π" and spans across the entrance side of the primary rolling mill (not shown in the figure, such as a four-roll reversible mill located to the right of the support bracket 1); the bottom of the support bracket 1 can be bolted to the frame base on the entrance side of the primary rolling mill.

[0047] There are two sets of infrared heaters 53, each set having two infrared radiators 2. The two sets of infrared heaters 53 are arranged vertically at intervals. The two infrared radiators 2 in the same set are used to heat the two side edge regions of the same billet. The edge region accounts for 10% to 20% of the billet width.

[0048] An adjustment mechanism is installed on the support bracket 1 and is used to adjust the distance between the two infrared radiators 2 in the same group.

[0049] The nitrogen purging mechanism is mounted on the support bracket 1 to generate a nitrogen curtain 41. The angle α between the nitrogen curtain 41 and the movement direction of the billet satisfies 0° < α < 45°. The infrared rays generated by the infrared radiator 2 pass through the nitrogen curtain 41 and act directly on the edge area of ​​the billet.

[0050] When using this material, aluminum sheet / strip / foil with a thickness of 0.8mm to 2.5mm is selected as the billet, and homogenization heating treatment is performed. The heating temperature is controlled at 350℃ to 420℃, and the holding time is not less than 3 hours. A primary rolling device (four-roll reversible rolling mill) is used for primary rolling, with the rolling temperature set at 360℃ to 400℃, the reduction (referring to the absolute dimensional change of the rolled piece in the thickness direction by the rolls) controlled at 30% to 40%, and the rolling speed at 2.0m / s to 3.5m / s. During the primary rolling process, the edge area of ​​the billet is locally heated by infrared radiator 2, with a heating power of 15kW / m to 25kW / m.

[0051] In the above process, only the edge region of the billet is heated. Since the edge region has a small area, the energy consumption for heating is low. The distance between the two sets of infrared radiators 2 can be adjusted by the adjustment mechanism, thereby adjusting the coverage area of ​​the edge region by the infrared radiators 2 to adapt to the heating requirements of edge regions of different sizes (10%–20%) under different operating conditions. The nitrogen curtain 41 generated by the nitrogen purging mechanism can, on the one hand, reduce the oxygen content in the heated edge region to inhibit oxidation, and on the other hand, guide and carry the hot gas generated by heating away from the stand of the primary rolling mill to prevent the stand from overheating.

[0052] It should be noted that the nitrogen curtain 41 is a gas flow layer that is almost completely transparent to infrared radiation and will not block the light path. In other words, the nitrogen curtain 41 does not affect the infrared radiation generated by the infrared radiator 2 from irradiating the billet.

[0053] The adjustment mechanism includes a suspension bracket 31 and a drive assembly. The suspension bracket 31 is installed on the upper part of the support bracket 1 and is used to suspend the infrared radiator 2. The drive assembly is installed on the support bracket 1 and is used to move the suspension bracket 31 and the infrared radiator 2 along the width direction of the blank, thereby adjusting the spacing between the two sets of infrared radiators 2 and adjusting the coverage of the infrared radiator 2 on the edge area.

[0054] The drive assembly includes a servo motor 32, a ball screw 33, and a slider 34. The ball screw 33 is connected to the output end of the servo motor 32, and the slider 34 is threadedly connected to the ball screw 33. The servo motor 32 drives the ball screw 33, which in turn causes the slider 34 to move the suspension bracket 31 and the infrared radiator 2, thereby adjusting the relative position of the infrared radiator 2 and the edge of the blank.

[0055] The aluminum sheet / strip foil edge heating device also includes a temperature control mechanism (not shown in the figure), which is used to adjust the power of the infrared radiator 2. The temperature control mechanism includes an infrared temperature probe, a PLC controller, and a power regulator. The infrared temperature probe monitors the temperature of the blank edge area located below the infrared radiator 2. The output of the infrared temperature probe is communicatively connected to the input of the PLC controller, and the output of the PLC controller is communicatively connected to the input of the power regulator. This temperature control mechanism forms a closed-loop control system for precise temperature regulation.

[0056] The nitrogen purging mechanism includes a support rod 42, a gas collection box 43, and a jet head 44.

[0057] Support rod 42 is installed on the load-bearing bracket 1.

[0058] The gas collecting box 43 is mounted on the support bracket 1 via a support rod 42. The gas collecting box 43 has an inlet port 431 for introducing nitrogen gas. The gas collecting box 43 has a connecting lug 45, which is rotatably connected to the support rod 42. A fastening nut 46 is threaded onto the connecting lug 45, and one end of the fastening nut 46 can abut against the support rod 42.

[0059] Multiple jet nozzles 44 are arranged in the lower part of the gas collection box 43 and located directly above the edge area of ​​the billet.

[0060] During operation, multiple jet nozzles 44 spray nitrogen gas to form a nitrogen curtain 41, protecting the edge area of ​​the heated billet. Simultaneously, they guide and carry the hot gas generated during heating away from the stand of the primary rolling mill, preventing overheating. The jet direction of the jet nozzles 44 is adjustable; during the initial commissioning phase, adjustment can be made simply by loosening the fastening nut 46.

[0061] Furthermore, the outlet of the jet head 44 is gradually widened to slow down the nitrogen flow rate at the outlet, so as to avoid the heat being carried away too quickly due to the excessive flow rate and thus avoid affecting the heating effect.

[0062] The aluminum plate and foil edge heating device also includes a nitrogen heating mechanism, which is used to heat the nitrogen entering the gas collection box 43 to avoid affecting the heating efficiency of the infrared radiator 2 due to the excessively low temperature of the nitrogen.

[0063] The nitrogen heating mechanism includes a heat exchange box 51, a blower 52, and a heater 53.

[0064] The heat exchange box 51 has a nitrogen inlet 511, a nitrogen outlet 512, a hot gas inlet 513, and a hot gas outlet 514. The nitrogen inlet 511 and the nitrogen outlet 512 are connected by a spiral pipe 515, and the nitrogen outlet 512 is connected to the air inlet 431 of the gas collection box 43 by a hose 516.

[0065] The outlet of blower 52 is connected to the inlet of heater 53.

[0066] The outlet of heater 53 is connected to the hot gas inlet 513.

[0067] Blower 52 draws air into heater 53, which heats the air. The air then enters heat exchange box 51 through hot air inlet 513, exchanges heat with nitrogen in spiral pipe 515, and is discharged from hot air outlet 514. The nitrogen in spiral pipe 515 increases in temperature after exchanging heat with the hot air in heat exchange box 51, which helps to avoid affecting the heating efficiency of infrared radiator 2 due to excessively low nitrogen temperature.

[0068] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heating device for the edge of an aluminum sheet / strip foil, characterized in that, include: The support frame is installed across the inlet side of the primary rolling unit; Two sets of infrared heaters are arranged vertically at intervals; Each group of infrared heaters has two infrared radiators, and the two infrared radiators in the same group are used to heat the two side edge areas of the same billet respectively. An adjustment mechanism for adjusting the spacing between two infrared radiators in the same group; A nitrogen purging mechanism is used to generate a nitrogen curtain, wherein the angle α between the nitrogen curtain and the movement direction of the billet satisfies 0° < α < 45°; the infrared rays generated by the infrared radiator pass through the nitrogen curtain and act directly on the edge area of ​​the billet.

2. The aluminum sheet / strip foil edge heating device according to claim 1, characterized in that, The adjustment mechanism includes a suspension frame and a drive assembly; the suspension frame is installed on the upper part of the support bracket and is used to suspend the infrared radiator; the drive assembly is installed on the support bracket and is used to move the suspension frame along the width direction of the blank.

3. The aluminum plate / strip foil edge heating device according to claim 2, characterized in that, The drive assembly includes a servo motor, a ball screw, and a slider; the ball screw is connected to the output end of the servo motor, and the slider is threadedly connected to the ball screw.

4. The aluminum sheet / strip foil edge heating device according to claim 1, characterized in that, The nitrogen purging mechanism includes: An air collection box is installed on the support bracket, and the air collection box has an air inlet. The jet heads, a plurality of which are arranged in the lower part of the gas collection box and located directly above the edge region of the billet.

5. The aluminum plate / strip foil edge heating device according to claim 4, characterized in that, The support bracket is equipped with a support rod, and the air collection box has a connecting lug. The connecting lug is rotatably connected to the support rod, and a fastening nut is threaded onto the connecting lug. One end of the fastening nut can abut against the support rod.

6. The aluminum sheet / strip foil edge heating device according to claim 4, characterized in that, The outlet of the jet head is gradually widening.

7. The aluminum sheet / strip foil edge heating device according to any one of claims 4 to 6, characterized in that, It also includes a nitrogen heating mechanism for heating the nitrogen entering the gas collection box.

8. The aluminum sheet / strip foil edge heating device according to claim 7, characterized in that, The nitrogen heating mechanism includes: The heat exchanger has a nitrogen inlet, a nitrogen outlet, a hot gas inlet, and a hot gas outlet; the nitrogen inlet and the nitrogen outlet are connected by a spiral pipe; the nitrogen outlet is connected to the gas inlet port. The blower's outlet is connected to the heater's inlet; A heater, the outlet of which is connected to the hot gas inlet.

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