Cooling device and cooling method for improving thickness difference of aluminum alloy horn mouth

Abstract

The invention discloses a cooling device and method for improving the thickness difference of an aluminum alloy horn mouth. The cooling device comprises two material frames arranged side by side, contact parts, felts laid on the contact parts and an air cooler assembly. The felt is a high-temperature-resistant felt resistant to the temperature of 200-700 DEG C; the contact part comprises a contact part body and an arc-shaped part which is formed by sinking from one side, far away from the material rack, of the contact part body to the direction close to the material rack; the four contact parts on the same material frame are divided into two groups which are distributed at intervals in the front-back direction, each group comprises two contact parts, the arc-shaped parts arranged on the two opposite contact parts of the two groups of contact parts are the same, and the arc-shaped parts arranged on the two contact parts in the same group of contact parts are symmetrically arranged and located on the same circle; the felt is fixed on the surface of the arc-shaped part. The cooling device for improving the thickness difference of the aluminum alloy horn mouth is simple in structure, flexible to use, low in cost and capable of increasing the cooling speed of a hot-rolled coil blank, accelerating operation of the blank and reducing process waste.

Description

[Technical field]

[0001] The present invention relates to the technical field of aluminum processing, and in particular to a cooling device and a cooling method used in 1-series and 3-series aluminum alloy processing technologies to improve the thickness difference of aluminum alloy bell mouths. [Background technology]

[0002] With the continuous development of the automobile industry, the environmental pollution, energy shortage and resource depletion caused by automobiles are becoming more and more serious. In order to achieve sustainable economic development, protect the environment where humans live and solve the problem of energy shortage, electric vehicles have emerged. With the development of new energy vehicles, the demand for large-size power battery shells has increased significantly. 3003 aluminum alloy (also known as aluminum alloy) is widely used for its easy forming, excellent comprehensive mechanical processing performance, good corrosion resistance, light specific gravity, moderate strength and strong anti-explosion ability. At present, the power battery shell is formed by stamping, which has large deformation, many stamping processes, complex stamping process, precise mold design and belongs to asymmetric box-type stamping. Because the stamping equipment mold of the power battery shell is complex and precise, and the gap is fixed, the thickness tolerance requirements of 3003 aluminum alloy strip are extremely strict. If the thickness is too thick, it will not be able to be stamped normally, and the damage to the mold during the stamping process is very large, which seriously shortens the service life of the mold. If the material is too thin, the material will not be able to provide sufficient flow compensation during stamping, or the material will be asymmetrically deformed or even wrinkled during the stamping process.

[0003] However, 1 series and 3 series aluminum alloys (also called soft alloys) have the characteristics of fast heat transfer and greater hardness change when the temperature drops than 5 series and other hard alloys. After hot rolling and coiling, 1 series and 3 series aluminum alloys are placed on a normal pad at high temperature. The contact area is large. Due to the fast heat transfer, the hardness of the contact position is inconsistent with that of other places, resulting in a flared thickness difference and uneven thickness in the cold rolled blank. [Summary of the invention]

[0004] The purpose of the embodiment of the present invention is to provide a cooling method for improving the thickness difference of the aluminum alloy bell mouth, so as to solve the problems of poor cooling effect and uneven thickness of the existing aluminum alloy.

[0005] In order to solve the above technical problems, in the first aspect, an embodiment of the present invention provides a cooling device for improving the thickness difference of the aluminum alloy bell mouth, the cooling device comprising two racks arranged side by side, a contact portion fixed above each rack, a felt laid on each contact portion, and a cooling fan assembly; four contact portions are arranged on each rack and are spaced apart from each other, the cooling fan assembly is arranged between the two racks, and is used to cool the hot-rolled aluminum coils placed on the two racks respectively; the felt is a high temperature resistant felt with a temperature resistance of 200°C to 700°C;

[0006] The contact part includes a contact part body fixed to the material rack and an arc-shaped part formed by a side of the contact part body being recessed toward the direction close to the material rack away from the material rack; the four contact parts on the same material rack are distributed in two groups with front and back intervals, each group includes two contact parts, the arc-shaped parts arranged on two contact parts facing each other in the two groups of contact parts are the same, and the arc-shaped parts arranged on two contact parts in the same group of contact parts are symmetrically arranged and located on the same circle; the felt is fixed to the surface of the arc-shaped part.

[0007] Preferably, the felt is a felt structure having at least two layers stacked together.

[0008] Preferably, the contact part on the same material rack includes a first contact part, a second contact part, a third contact part and a fourth contact part which are spaced apart; the first contact part, the second contact part, the third contact part and the fourth contact part are respectively fixed at the four corners of the material rack; the first contact part and the second contact part are arranged opposite to each other and form a group, and the third contact part and the fourth contact part are arranged opposite to each other and form a group.

[0009] Preferably, the cold air fan assembly includes a frame and a cooling fan fixed in the frame; the frame is fixed between the two material racks, and wedge-shaped bell-mouth channels are also provided on opposite sides above the frame, one end of the wedge-shaped bell-mouth channel corresponds to and is connected to an air outlet of the cooling fan, and the other end of the wedge-shaped bell-mouth channel is arranged toward the contact portion and is opposite to it, so as to blow cold air to the hot-rolled aluminum coil.

[0010] Preferably, the air inlet of the cooling fan is spaced apart from the ground, and the air outlet of the cooling fan is arranged upwardly and perpendicular to the ground.

[0011] Preferably, the cooling fan assembly further includes a refrigeration device, which is spaced apart at one side of the air inlet of the cooling fan, and is used to provide cold air for the cooling fan.

[0012] Preferably, the refrigeration device is provided with a gear adjustment device, and the gear adjustment device is used to adjust the refrigeration gear of the refrigeration device.

[0013] In a second aspect, an embodiment of the present invention further provides a cooling method for improving the thickness difference of an aluminum alloy bell mouth. The cooling method is implemented based on the above-mentioned cooling device for improving the thickness difference of an aluminum alloy bell mouth. The cooling method comprises the following steps:

[0014] S1. Transferring two hot-rolled aluminum coils to above the two material racks, and placing the two hot-rolled aluminum coils on the felts on the contact parts of the two material racks respectively;

[0015] S2. Continuously blowing air to cool the two material racks respectively through the air cooler assembly.

[0016] Preferably, the following steps are also included before step S1:

[0017] S0. Place two layers of first felt on the trolley material rack of the coil transport trolley, and lift the hot-rolled aluminum coil onto the trolley material rack so that the hot-rolled aluminum coil is located on the first felt; wherein the first felt is a high-temperature resistant felt with a temperature resistance of 200°C to 700°C.

[0018] Compared with the prior art, the cooling device for improving the thickness difference of the aluminum alloy bell mouth in the present invention has two material racks arranged side by side, four contact parts are arranged above each material rack, four contact parts are arranged on each material rack and are spaced from each other, a felt is installed on each contact part, and a cooling air fan assembly is arranged between the two material racks for cooling the hot-rolled aluminum coils placed on the two material racks respectively; the felt is a high-temperature resistant felt of 200°C to 700°C; the contact part includes a contact part body fixed to the material rack and an arc-shaped part formed by a side of the contact part body away from the material rack and concave toward the material rack; the four contact parts on the same material rack are distributed in two groups with front and back intervals, each group includes two contact parts, the arc-shaped parts arranged on the two contact parts of the two groups of contact parts facing each other are the same, and the arc-shaped parts arranged on the two contact parts in the same group of contact parts are symmetrically arranged and located on the same circle; the felt is fixed to the surface of the arc-shaped part. By arranging four contact parts above each material rack and installing felt on the contact parts, the contact between the material rack and the billet coil is greatly reduced, the rapid heat transfer with the material rack is isolated, and the temperature of each part of the hot-rolled aluminum coil is kept uniform. In addition, the material rack is suspended, and the cooling fan assembly and the circulating fan on the roof allow the high-temperature gas to be discharged in time, which can achieve the overall cooling of the coils in the coil warehouse; this can be simple and effective, flexible to use, low cost, and can also speed up the cooling speed of the hot-rolled aluminum coil, speed up the operation of the billet, reduce process waste, and avoid other defects in the process. The most important thing is that it can solve the thickness difference defects of the flare of 1 series and 3 series aluminum alloys, and the new energy industry with extremely strict requirements on thickness tolerance can also meet the market demand well.

Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0020] Figure 1A front view of a cooling device for improving the thickness difference of an aluminum alloy bell mouth provided by an embodiment of the present invention;

[0021] Figure 2 A left view of a cooling device for improving the thickness difference of an aluminum alloy bell mouth provided by an embodiment of the present invention;

[0022] Figure 3 A top view of a material rack of a cooling device for improving the thickness difference of an aluminum alloy bell mouth provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a temperature curve of a cooling device for improving the thickness difference of an aluminum alloy bell mouth provided by an embodiment of the present invention without a high-temperature-resistant felt pad for a blowing position measuring point;

[0024] Figure 5 for Figure 4 Schematic diagram of the thickness fluctuation of the bell mouth of processed aluminum coil;

[0025] Figure 6 A schematic diagram of the temperature changes over time at four measuring points of a cooling device for improving the thickness difference of an aluminum alloy bell mouth provided by an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the temperature curve of the measuring point No. ② of the high temperature resistant felt blowing position of the cooling device for improving the thickness difference of the aluminum alloy bell mouth provided by the embodiment of the present invention;

[0027] Figure 8 for Figure 7 Schematic diagram of the thickness fluctuation of the bell mouth of processed aluminum coil;

[0028] Fig. 9 The present invention is a flowchart of a cooling method for improving the thickness difference of an aluminum alloy bell mouth provided in an embodiment of the present invention.

[0029] In the figure, 100, a cooling device for improving the difference in thickness of an aluminum alloy bell mouth, 1, a material rack, 2, a contact portion, 21, a contact portion body, 22, an arc-shaped portion, 3, a felt, 4, an air cooler assembly, 41, a rack, 42, a cooling fan, 43, a wedge-shaped bell mouth channel, 5, a first contact portion, 6, a second contact portion, 7, a third contact portion, 8, a fourth contact portion, 9, a refrigeration device, 91, a gear adjustment device, 10, a hot-rolled aluminum coil. [Specific implementation method]

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] First, as Figure 1-Figure 3 As shown, an embodiment of the present invention provides a cooling device 100 for improving the thickness difference of the aluminum alloy bell mouth, the cooling device 100 includes two material racks 1 arranged side by side, a contact portion 2 fixed above each of the material racks 1, a felt 3 laid on each of the contact portions 2, and a cooling air machine assembly 4; four contact portions 2 are arranged on each of the material racks 1 and are spaced apart from each other, the cooling air machine assembly 4 is arranged between the two material racks 1, and is used for cooling the hot-rolled aluminum coils 10 placed on the two material racks 1 respectively; the felt 3 is a high-temperature resistant felt 3 with a temperature resistance of 200°C to 700°C. The contact part 2 includes a contact part body 21 fixed to the material rack 1 and an arc-shaped part 22 formed by the side of the contact part body 21 away from the material rack 1 being recessed toward the material rack 1; the four contact parts 2 on the same material rack 1 are divided into two groups and spaced apart from each other, each group includes two contact parts 2, the arc-shaped parts 22 arranged on the two contact parts 2 facing each other in the two groups of contact parts 2 are the same, and the arc-shaped parts 22 arranged on the two contact parts 2 in the same group of contact parts 2 are symmetrically arranged and located on the same circle. The felt 3 is fixed to the surface of the arc-shaped part 22. Among them, the arc-shaped parts 22 of two adjacent contact parts 2 have the same structure, and the arc-shaped parts 22 of two opposite contact parts 2 are symmetrical to each other.

[0032] Specifically, two material racks 1 are arranged side by side, four contact parts 2 are arranged above each material rack 1, and a felt 3 is installed on each contact part 2. A cooling fan assembly 4 is arranged between the two material racks 1 to cool the hot-rolled aluminum coils 10 placed on the two material racks 1 respectively; the felt 3 is a high-temperature resistant felt of 200°C to 700°C; the contact part 2 includes a contact part body 21 fixed to the material rack 1 and an arc-shaped part 22 formed by a side of the contact part body 21 away from the material rack 1 being recessed toward the material rack 1; the arc-shaped parts 22 of two adjacent contact parts 2 have the same structure, and the arc-shaped parts 22 of two opposite contact parts 2 are symmetrical to each other; the felt 3 is fixed to the surface of the arc-shaped part 22; by arranging four contact parts 2 above each material rack 1, the material rack 1 and the hot-rolled aluminum coil 10 and the contact part 2 are in four-point contact, which greatly reduces the contact area between the material rack 1 and the blank coil. A high temperature resistant felt 3 is installed on the contact part 2 to isolate the rapid heat transfer with the rack 1. The temperature of each part of the hot-rolled aluminum coil 10 is kept uniform. In addition, the rack 1 is suspended, and the cold air fan assembly 4 and the circulating fan on the roof allow the high-temperature gas to be discharged in time, so as to achieve the overall cooling of the coils in the coil warehouse. This can be simple and effective, flexible to use, low cost, and can also speed up the cooling speed of the hot-rolled aluminum coil 10, speed up the operation of the billet, reduce process waste, and avoid other defects caused by the process. The most important thing is that it can solve the thickness difference defects of the flare mouth of 1 series and 3 series aluminum alloys, and the new energy industry with extremely strict requirements on thickness tolerance can also meet the market demand well.

[0033] In this embodiment, the felt 3 is a stacked structure of at least two layers of felt. The multi-layer felt structure has a uniform heat dissipation effect.

[0034] In this embodiment, the contact portion 2 on the same material rack 1 includes a first contact portion 5, a second contact portion 6, a third contact portion 7 and a fourth contact portion 8 which are spaced apart; the first contact portion 5, the second contact portion 6, the third contact portion 7 and the fourth contact portion 8 are respectively fixed at the four corners of the material rack 1; the first contact portion 5 and the second contact portion 6 are arranged opposite to each other, the third contact portion 7 and the fourth contact portion 8 are arranged opposite to each other and form a group, and the first contact portion 5 and the second contact portion 6 are respectively arranged adjacent to the third contact portion 7 and the fourth contact portion 8 and form a group.

[0035] In this embodiment, the material rack 1 is suspended above, and a square stone pier 40 cm high is built below. The first contact part 5, the second contact part 6, the third contact part 7 and the fourth contact part 8 are respectively arranged at the four corners of the stone pier. The first contact part 5, the second contact part 6, the third contact part 7 and the fourth contact part 8 are respectively composed of 4 iron trapezoids to form 2 inner eight shapes, and the trapezoids are inlaid with high-temperature resistant felt. Placing the blank roll on the material rack 1 with the high-temperature resistant felt installed greatly reduces the contact between the material rack 1 and the blank roll, isolates the rapid heat transfer with the cold material rack 1, and keeps the temperature of each part of the blank roll uniform. In addition, the material rack 1 is suspended in the air, and the cold air fan assembly 4 and the circulating fan on the roof allow the high-temperature gas to be discharged in time, so as to achieve the overall cooling of the rolls in the roll warehouse.

[0036] In this embodiment, the cooling fan assembly 4 includes a frame 41 and a cooling fan 42 fixed in the frame 41; the frame 41 is fixed between the two material racks 1, and wedge-shaped bell-mouth channels 43 are provided on opposite sides above the frame 41, one end of the wedge-shaped bell-mouth channel 43 corresponds to and is connected with the air outlet of the cooling fan 42, and the other end of the wedge-shaped bell-mouth channel 43 faces the contact portion 2 and is arranged oppositely, for blowing cold air to the hot-rolled aluminum coil 10. Two wedge-shaped bell-mouth outlet channels in different directions are designed just above the air outlet. The innovation of the two-channel design is that one fan can complete the cooling of the front and rear aluminum coil end faces, effectively concentrate the wind force to cool the aluminum coil section, reduce the energy waste of the fan, and quickly achieve the cooling effect.

[0037] In this embodiment, the air inlet of the cooling fan 42 is spaced apart from the ground, and the air outlet of the cooling fan 42 is arranged vertically and upwardly from the ground.

[0038] Specifically, the air outlet of the cooling fan 42 is vertically upward, and the air inlet of the cooling fan 42 is located close to the ground. According to the air temperature law, the ground temperature in the vertical direction increases toward the roof temperature. A circulating fan is installed at the edge above the roof to cool the rolls in the roll warehouse as a whole.

[0039] In this embodiment, the cooling fan assembly 4 further includes a refrigeration device 9, which is arranged at a distance on one side of the air inlet of the cooling fan 42, and is used to provide cold air for the cooling fan 42. Optionally, the refrigeration device 9 can be an air-cooling device such as a compressor refrigeration.

[0040] In this embodiment, a gear adjustment device 91 is provided on the refrigeration device 9 , and the gear adjustment device 91 is used to adjust the refrigeration gear of the refrigeration device 9 .

[0041] Specifically, the air-cooling fan is equipped with a refrigeration device 9, which is turned on in hot summer to cool the surrounding air. The refrigeration device 9 is provided with a gear adjustment device 91, which can set the cooling intensity according to the change of weather temperature.

[0042] In this embodiment, Figure 4-5 As shown, the corresponding temperature test results are carried out on the side where the tray contacts the blowing, the side where the tray contacts the non-blowing, the side where the air contacts the blowing, and the side where the air contacts the non-blowing. For example, when the material rack 1 is not padded with high-temperature felt, the aluminum coil is blown on one side and not blown on the other side in the same period of time. The temperature difference of the upper and lower parts of the aluminum coil, the blowing and non-blowing parts, a total of 4 parts, is large. The temperature difference of the non-blowing part is 38°C higher than that of the blowing part on average. This temperature difference will have a great impact on the hardness of the material. The hardness of the part with high temperature is low, and the hardness of the part with low temperature is high. After processing again, the thickness fluctuation of the bell mouth will appear.

[0043] In this embodiment, Figure 6-8 As shown, a point is measured every 10 circles, ①②③④ are measuring points from outside to inside respectively, and a group of temperatures are measured at intervals of 10min within 10min-120min. By padding high temperature resistant felt on the material rack 1, at the same time, one side of the aluminum coil is blown and the other side is not blown. The material grains of the upper and lower parts of the aluminum coil are consistent with those of the blown and non-blown parts. The temperature of the aluminum coil is uniform without abnormal fluctuations, and the thickness fluctuation is normal after reprocessing. According to the corresponding comparison results, the present invention can be simple and effective, flexible to use, and low in cost. It can also speed up the cooling rate of the hot-rolled aluminum coil 10, speed up the operation of the billet, reduce process waste, and avoid other defects generated in the process. The most important thing is that it can solve the thickness difference defects of the flared mouth of 1 series and 3 series aluminum alloys, and the new energy industry with extremely strict requirements on thickness tolerance can also meet the market demand well.

[0044] Second, as Fig. 9As shown, an embodiment of the present invention provides a cooling method for improving the thickness difference of the aluminum alloy bell mouth, and the cooling method is implemented by the cooling device 100 for improving the thickness difference of the aluminum alloy bell mouth, and the cooling method comprises the following steps:

[0045] S1. Transfer two hot-rolled aluminum coils 10 to the top of the two material racks 1, and place the two hot-rolled aluminum coils 10 on the felts 3 on the contact parts 2 of the two material racks 1. By placing two material racks 1 opposite to each other and placing two second felts on the two material racks 1, the hot-rolled aluminum coils 10 are transferred to the top of the two material racks 1 by the coil transport trolley, and the hot-rolled aluminum coils 10 are placed on the second felts.

[0046] Specifically, the hot-rolled aluminum coil 10 on the running trolley is transferred to the billet rack 1, and cooling is started. The innovation of the present invention lies in the billet rack 1, which is suspended in the air, and is built with square stone piers 40 cm high below. The four corners of the stone piers are formed into two inner eight shapes with four iron trapezoids, and the trapezoids are inlaid with high-temperature resistant felt. The billet roll is placed on the rack 1 with high-temperature resistant felt, and the fan is turned on for cooling. The rack 1 designed by this invention greatly reduces the contact between the rack 1 and the billet roll, isolates the rapid heat transfer with the cold rack 1, and keeps the temperature of each part of the billet roll uniform.

[0047] S2. Continuously blow air to cool the two material racks 1 respectively through the air cooler assembly 4.

[0048] Specifically, the cooling fans 42 on both sides of the hot-rolled aluminum coil 10 of the material rack 1 are turned on for cooling. First, a refrigeration device 9 is added to the cold air machine. The refrigeration device 9 is turned on in the hot summer to cool the surrounding air. The refrigeration device 9 is set with a jump gear position, and the cooling intensity can be set according to the change of weather temperature. Second, the design of the placement of the cold air machine is that the air outlet is vertically upward, and the air inlet position is close to the ground. According to the air temperature law, the ground temperature in the vertical direction increases toward the roof temperature. A circulating fan is installed on the edge above the roof to cool the coils in the coil warehouse as a whole. Third, two wedge-shaped trumpet outlet channels in different directions are designed just above the air outlet of the cold air machine. The innovative point of the two-channel design is that one cold air machine can complete the cooling of the front and rear end faces of the aluminum coils, effectively concentrate the wind force to cool the cross-section of the aluminum coil, reduce the energy waste of the fan, and quickly achieve the cooling effect.

[0049] S3, the cooled hot rolled aluminum coil 10 is replaced. According to different cooling levels, the temperature can be reduced to a suitable temperature in a certain period of time, and the cooled billet coil is transferred to the cold rolling blanking according to the time recorded in the warehouse, and the other billet coil is placed in the cooling area.

[0050] Before step S1, the following steps are also included: S0, adding two layers of first felt on the material rack 1 of the coil transport trolley, and lifting the hot-rolled aluminum coil 10 onto the first felt; the first felt is a high-temperature resistant felt of 200°C to 700°C.

[0051] Among them, the final rolling temperature of hot rolling is generally 260-400°C, and the rolling is performed without a sleeve. The aluminum coil cannot be suspended in the air. The hot rolled aluminum coil 10 is hoisted onto the coil transport trolley, and two layers of high temperature resistant felt are added to the coil transport trolley material rack 1. The two layers of high temperature resistant felt used in the present invention are to prevent the temperature of the contacting place of the material rack 1 from dropping sharply during the transportation process, and to maintain the temperature of the coil.

[0052] In summary, the present invention is simple and effective, flexible to use, low cost, and can also speed up the cooling rate of the hot-rolled aluminum coil 10, speed up the operation of the billet, reduce process waste, and avoid other defects generated in the process. The most important thing is that it can solve the thickness difference defects of the flare mouth of 1 series and 3 series aluminum alloys, and can also meet the market demand for new energy industries with extremely strict requirements on thickness tolerance.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cooling device for improving the thickness difference of aluminum alloy bell mouth, characterized in that: The cooling device comprises two racks arranged side by side, a contact portion fixed above each rack, a felt laid on each contact portion, and a cooling fan assembly; four contact portions are arranged on each rack and are spaced apart from each other, and the cooling fan assembly is arranged between the two racks to cool the hot-rolled aluminum coils placed on the two racks respectively; the felt is a high-temperature resistant felt with a temperature resistance of 200°C to 700°C; The contact part includes a contact part body fixed to the material rack and an arc-shaped part formed by a side of the contact part body being recessed toward the direction close to the material rack away from the material rack; the four contact parts on the same material rack are distributed in two groups with front and back intervals, each group includes two contact parts, the arc-shaped parts arranged on two contact parts facing each other in the two groups of contact parts are the same, and the arc-shaped parts arranged on two contact parts in the same group of contact parts are symmetrically arranged and located on the same circle; the felt is fixed to the surface of the arc-shaped part.

2. The cooling device for improving the thickness difference of the aluminum alloy bell mouth according to claim 1, characterized in that: The felt is a felt structure of at least two layers stacked together.

3. The cooling device for improving the thickness difference of the aluminum alloy bell mouth according to claim 1, characterized in that: The contact parts on the same material rack include a first contact part, a second contact part, a third contact part and a fourth contact part which are spaced apart; the first contact part, the second contact part, the third contact part and the fourth contact part are respectively fixed at the four corners of the material rack; the first contact part and the second contact part are arranged opposite to each other and form a group, and the third contact part and the fourth contact part are arranged opposite to each other and form a group.

4. The cooling device for improving the thickness difference of the aluminum alloy bell mouth according to claim 1, characterized in that: The cooling air fan assembly includes a frame and a cooling air fan fixed in the frame; the frame is fixed between the two material racks, and wedge-shaped bell-mouth channels are provided on opposite sides above the frame, one end of the wedge-shaped bell-mouth channel corresponds to and is connected with an air outlet of the cooling air fan, and the other end of the wedge-shaped bell-mouth channel is arranged toward the contact portion and is directly opposite to the contact portion, so as to blow cold air to the hot-rolled aluminum coil.

5. The cooling device for improving the thickness difference of the aluminum alloy bell mouth according to claim 4, characterized in that: The air inlet of the cooling fan is spaced apart from the ground, and the air outlet of the cooling fan is arranged vertically and upwardly from the ground.

6. The cooling device for improving the thickness difference of the aluminum alloy bell mouth as claimed in claim 5, characterized in that: The cooling fan assembly also includes a refrigeration device, which is spaced apart on one side of the air inlet of the cooling fan and is used to provide cold air for the cooling fan.

7. The cooling device for improving the thickness difference of the aluminum alloy bell mouth according to claim 6, characterized in that: The refrigeration device is provided with a gear adjustment device, and the gear adjustment device is used to adjust the refrigeration gear of the refrigeration device.

8. A cooling method for improving the thickness difference of aluminum alloy bell mouth, characterized in that: The cooling method is implemented based on the cooling device for improving the thickness difference of the aluminum alloy bell mouth according to any one of claims 1 to 7, and the cooling method comprises the following steps: S1. Transferring two hot-rolled aluminum coils to above the two material racks, and placing the two hot-rolled aluminum coils on the felts on the contact parts of the two material racks respectively; S2. Continuously blowing air to cool the two material racks respectively through the air cooler assembly.

9. The cooling method for improving the thickness difference of the aluminum alloy bell mouth as claimed in claim 8, further comprising the following steps before step S1: S0, placing two layers of first felt on the trolley material rack of the coil transport trolley, and hoisting the hot-rolled aluminum coil onto the trolley material rack so that the hot-rolled aluminum coil is located on the first felt; wherein, The first felt is a high temperature resistant felt having a temperature resistance of 200°C to 700°C.

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