A device and a method for on-line cooling of strip reversible rolling

Abstract

The present application relates to the technical field of metal rolling, and discloses a device and method for realizing on-line cooling of reversible strip rolling, which comprises a box for storing rolling oil, two symmetrical pressure rollers inside the box, which can move up and down, for pressing the strip into the rolling oil for cooling, a cold air pipe group at both ends of the box, a fixed frame inside the box, which can move up and down, a fixed shaft at the lower end of the side surface of the fixed frame, and detection wheels evenly distributed on the fixed shaft and rotating on the fixed shaft. The device is symmetrically arranged at the inlet and outlet of the rolling mill to form a bidirectional cooling channel, and the composite cooling mode of rolling oil immersion cooling and cold air jet cooling can realize instant and efficient cooling of the rolled strip, and can detect the plate shape defects such as waves and warping on the surface of the strip, so the device is versatile and easy to use.

Description

Technical Field

[0001] This invention relates to the field of metal rolling technology, specifically to an online cooling device and method for reversible strip rolling. Background Technology

[0002] Currently, in the cold rolling of non-ferrous metal strips, hot-rolled strips of pure copper, as well as pure titanium, pure nickel, and pure molybdenum, have successfully achieved reversible rolling processes during subsequent cold rolling. These materials can be directly rolled to the target thickness and then cut after a single uncoiling, using a multi-pass reversible rolling method (left → right, right → left), significantly improving production efficiency.

[0003] However, reversible rolling technology has yet to be achieved in the cold roughing process of special high-copper alloys such as titanium bronze and nickel bronze, high-nickel-based high-temperature alloys, high-nickel-based precision alloys, high-nickel-based functional materials, and high-content aluminum alloy strips after hot rolling to a thickness of 3-15 mm. Current production technology still employs a unidirectional, single-pass rolling method: after the strip is uncoiled from the left-side uncoiler, it can only be rolled in one direction. That is, after completing one pass, the strip is unloaded from the coiler and transported back to the uncoiler to be re-coiled for the next pass; this cycle is repeated multiple times until the target thickness of 0.1-1.0 mm is achieved. This production process suffers from significant problems such as low production efficiency and long auxiliary time. The fundamental reason why the aforementioned metals and alloys are difficult to reversibly roll lies in their material properties: these alloys have a certain strength, and during the rolling process, the heat of deformation and friction between the material and the rolls cause the heat generated by the metal strip to increase continuously after the deformation. If a reversible rolling process is adopted, the rolling temperature of the next pass will be superimposed with the residual temperature, deformation heat, and friction heat of the previous pass, which can easily reach the phase transformation temperature or recrystallization temperature of the metal, thus turning the expected cold rolling process into a warm rolling process, which seriously reduces the strength and surface quality of the metal strip.

[0004] To address the issue that metals and alloys can only be rolled in a single pass, patent CN119140601A discloses a reversible cold roughing and rolling production system for non-ferrous metal strips. This system primarily utilizes exhaust gas from a full oil recovery system to air-cool the rolled strip, thereby reducing the temperature of the rolled coil. However, this single-air-cooling method suffers from short cooling time and a limited cooling approach, only providing some heat dissipation to the strip surface. The internal heat of the strip cannot be quickly dissipated, resulting in poor cooling performance. Furthermore, this technical solution cannot detect surface defects during cooling, making its functionality limited.

[0005] Therefore, the present invention provides an online cooling device and cooling method for reversible strip rolling, which can effectively control the strip temperature during reversible rolling, avoid the adverse effects of temperature superposition between passes on material properties, and thus achieve efficient reversible rolling of difficult-to-deform metal strips. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the existing defects and provide an online cooling device and method for reversible strip rolling. By symmetrically arranging online cooling devices on the inlet and outlet sides of the rolling mill, a bidirectional cooling channel is constructed. A composite cooling method of rolling oil immersion cooling and cold air jet cooling is adopted, which can instantly and effectively cool the rolled strip. It can also detect strip surface defects such as wavy and warped strips. It has multiple functions, is easy to use, and can effectively solve the problems in the background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an online cooling device for reversible strip rolling, comprising a box for storing rolling oil, strip-shaped holes at the upper ends of both ends of the box, guide rollers for guiding the strip at the corresponding positions of the box and the strip-shaped holes, pressure rollers that can move up and down symmetrically arranged on both sides of the inside of the box for pressing the strip into the rolling oil for cooling, cold air ducts at both ends of the inside of the box for blowing away the rolling oil on the surface of the strip and air cooling the strip, and a fixed frame that can move up and down inside the box, a fixed shaft at the lower side of the fixed frame, and evenly distributed detection wheels rotatably arranged on the fixed shaft for detecting surface defects of the strip, magnetic pieces at the inner edge of the detection wheels, and Hall sensors for detecting whether the detection wheels are rotating at the bottom of the fixed frame corresponding to the magnetic pieces.

[0008] As a preferred embodiment of the present invention, the guide roller assembly includes an inner guide roller installed inside the housing and an outer guide roller installed outside the housing, wherein the outer guide roller and the inner guide roller are arranged in parallel.

[0009] As a preferred embodiment of the present invention, the pressure roller is located between two inner guide rollers, and an electric push rod is provided at the part of the housing corresponding to the pressure roller. The telescopic end of the electric push rod is provided with a mounting frame, the pressure roller is rotatably mounted on the mounting frame, and a guide telescopic rod connected to the mounting frame is vertically provided on the housing.

[0010] As a preferred embodiment of the present invention, a servo motor is provided on the upper surface of the housing corresponding to the fixing frame, the output shaft of the servo motor is mounted with a lead screw through a coupling, the upper surface of the fixing frame is provided with a threaded cylinder threadedly connected to the lead screw, and an auxiliary telescopic rod connected to the fixing frame is vertically provided on the housing.

[0011] As a preferred technical solution of the present invention, the upper end of the outer side surface of the box body corresponding to one of the strip holes is provided with a horizontal plate, and a row of infrared temperature sensors are evenly arranged on the horizontal plate to detect the temperature of a line along the entire width of the strip.

[0012] As a preferred embodiment of the present invention, the top of the housing is provided with an exhaust pipe, and the side of the housing is provided with a cold oil inlet pipe and a hot oil outlet pipe.

[0013] As a preferred embodiment of the present invention, the cold air duct assembly includes an upper air duct and a lower air duct. The upper air duct is installed at the end of the inner cavity of the housing and located above the strip hole, and the lower air duct is installed at the end of the inner cavity of the housing and located below the strip hole. The upper air duct is provided with an upper nozzle that blows towards the upper surface of the strip, and the lower air duct is provided with a lower nozzle that blows towards the lower surface of the strip. The outer side of the housing is provided with a cold air duct connected to the upper air duct and the lower air duct for connecting an external cold air blower.

[0014] A cooling method for implementing an online cooling device for reversible strip rolling includes the following steps:

[0015] S1. Two boxes are symmetrically arranged between the uncoiling machine and the rolling mill, and between the coiling machine and the rolling mill, respectively, forming symmetrical cooling stations on the outlet and inlet sides of the rolling line; rolling oil is injected into the box at a predetermined level to ensure that the liquid level is sufficient to submerge the passing strip; the external cold rolling oil delivery pump is connected to the cold oil inlet pipe, and the rolling mill oil cooling device is connected to the hot oil outlet pipe to form a complete and circulatory rolling oil cooling circuit.

[0016] S2. Forward rolling cooling and quality control process:

[0017] S21. The rolled strip enters through the strip hole at the inlet end of the box and exits through the strip hole at the outlet end. During this process, the electric push rod near the strip hole at the inlet end extends, thereby pushing the mounting frame and pressure rollers downward, forcing the rolled strip to change its running trajectory, so that it can be fully immersed in the rolling oil for preliminary and efficient heat exchange and cooling.

[0018] S22. After the cooled strip is guided out of the liquid surface by the inner and outer guide rollers at the exit end, the upper air pipe sprays low-temperature cold air downward through the upper nozzle to simultaneously blow and cool the upper surface of the strip. At the same time, the lower air pipe blows and cools the lower surface of the strip in the same way through the lower nozzle, thereby efficiently removing the rolling oil remaining on the surface of the strip and further reducing the temperature of the strip.

[0019] S23. After the cooled strip is removed from the rolling oil surface, its upper surface contacts the detection wheel and drives the detection wheel to rotate. When there are wavy or warped defects on the surface of the strip, the defective part will sink downward under the action of the surface tension and fluid dynamics of the rolling oil, resulting in poor contact between the detection wheel corresponding to the defective part and the strip, so that it cannot rotate or the speed is significantly reduced. By detecting the change in the speed of the corresponding detection wheel in real time by the Hall sensor, it is possible to accurately determine whether there are wavy or warped defects on the surface of the strip and their approximate location.

[0020] S3. When the cooled strip is coiled in this pass and reverse rolled, the cooling path switching process is executed. At this time, the electric push rod at the original exit end of the box is first extended to convert it into a new immersion cooling end, and the electric push rod at the original inlet end of the box is shortened to convert it into a new guide exit end. During the reverse rolling process, the strip passes through the rolling oil in the box again in the opposite direction for cooling and air cooling, and then enters the rolling mill for the next rolling pass.

[0021] In a preferred embodiment of the present invention, in step S2, after the cooled strip is guided by the inner and outer guide rollers at the exit end, an infrared temperature sensor performs online real-time detection of the final surface temperature of the strip about to leave the cooling box. When the detected temperature is higher than the preset target value, the servo motor is controlled to work, and the servo motor drives the lead screw to rotate, which in turn causes the threaded cylinder meshing with the lead screw to drive the fixed frame to move smoothly downward along the length of the auxiliary telescopic rod. The fixed frame ultimately drives the detection wheel to move downward synchronously through the fixed shaft. The detection wheel then applies controllable downward pressure to the strip that passes through, thereby increasing the sag of the strip in the box and effectively increasing the immersion length and cooling time of the strip in the rolling oil, realizing dynamic and precise adjustment of the cooling intensity until the strip temperature returns to the target range.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The online cooling device and method for reversible strip rolling exemplified by the present invention adopts a composite cooling scheme of rolling oil immersion cooling and cold air jet secondary cooling and purging to instantly and effectively cool the rolled strip. In this way, the rolling deformation heat can be removed in a timely and effective manner, completely eliminating the risk of the strip temperature rising above the recrystallization temperature due to the temperature superposition between passes. This ensures that the rolling process is always in a true cold rolling state, thereby stabilizing the mechanical properties and microstructure of the difficult-to-deform metal strip and avoiding the strength reduction and surface quality problems caused by temperature rise.

[0024] 2. The online cooling device and cooling method for reversible strip rolling exemplified by the present invention can identify strip surface defects such as wavy and warped in real time and online by using a detection wheel and a Hall sensor. This online detection mode replaces the traditional post-inspection. Once a defect is found, the rolling process can be adjusted in time, changing passive control to active prevention, which significantly improves the first pass rate and quality consistency of the product.

[0025] 3. The online cooling device and method for reversible strip rolling exemplified by the present invention monitors the strip temperature at the exit in real time through an infrared temperature sensor, and dynamically changes the immersion length and cooling time of the strip in the rolling oil by adjusting the pressing depth of the detection wheel. This enables the cooling system to have the ability to adapt to different rolling speeds and deformation heat of different passes, ensuring the stability and uniformity of the cooling effect under various working conditions, and further improving the intelligence level and stability of the entire production system.

[0026] 4. The online cooling device and cooling method for reversible strip rolling exemplified by the present invention constructs a bidirectional cooling channel by symmetrically arranging online cooling devices on the inlet and outlet sides of the rolling mill, and adopts a composite cooling method of rolling oil immersion cooling and cold air jet cooling, which can instantly and effectively cool the rolled strip, and can detect strip shape defects such as wavy and warped surface of the strip. It has multiple functions and is easy to use. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the left-side structure of the present invention;

[0029] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 4 for Figure 3 A schematic diagram of the right-side view structure;

[0031] Figure 5 for Figure 3 A front view structural diagram;

[0032] Figure 6 This is a partial structural diagram of the present invention;

[0033] Figure 7 This is a schematic diagram of the detection wheel in this invention;

[0034] Figure 8 This is a schematic diagram of the structure during forward rolling of the present invention;

[0035] Figure 9This is a schematic diagram of the structure during reverse rolling of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure in this invention when the immersion length of the strip is adjusted by a detection wheel.

[0037] In the diagram: 1. Housing, 2. Outer guide roller, 21. Inner guide roller, 3. Electric push rod, 31. Mounting bracket, 32. Pressure roller, 33. Guide telescopic rod, 4. Servo motor, 41. Lead screw, 5. Fixing bracket, 51. Threaded cylinder, 52. Fixing shaft, 53. Detection wheel, 54. Hall sensor, 55. Magnet, 56. Auxiliary telescopic rod, 6. Horizontal plate, 61. Infrared temperature sensor, 7. Exhaust pipe, 8. Cold air duct, 81. Upper air duct, 82. Upper nozzle, 83. Lower air duct, 84. Lower nozzle. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1-10 This invention provides a technical solution: an online cooling device for reversible strip rolling, comprising a box 1 for storing rolling oil, with strip-shaped holes at the upper ends of both ends of the box 1, and guide roller sets for guiding the strip at the corresponding positions of the box 1 and the strip-shaped holes; pressure rollers 32 that can move up and down are symmetrically arranged on both sides inside the box 1 for pressing the strip into the rolling oil for cooling; cold air ducts are provided at both ends inside the box 1 for blowing away the rolling oil on the surface of the strip and air cooling the strip; and a fixed frame 5 that can move up and down is provided inside the box 1, with a fixed shaft 52 at the lower side of the fixed frame 5, on which a rotating fixed shaft 52 is mounted. The strip is equipped with uniformly distributed detection wheels 53 for detecting surface defects. The inner edge of the detection wheel 53 is provided with a magnet 55. The bottom of the fixing frame 5, corresponding to the magnet 55, is provided with a Hall sensor 54 for detecting whether the detection wheel 53 is rotating. When there are wavy or warped defects on the surface of the strip, the defective part is concave downward under the action of the surface tension of the rolling oil and the fluid dynamics, which causes poor contact between the detection wheel 53 corresponding to the defective part and the strip, so that it cannot rotate or the rotation speed is significantly reduced. By detecting the change in the rotation speed of the corresponding detection wheel 53 in real time by the Hall sensor 54, it is possible to accurately determine whether there are wavy or warped defects on the surface of the strip and their approximate location.

[0040] Furthermore, the guide roller assembly includes an inner guide roller 21 installed inside the housing 1 and an outer guide roller 2 installed outside the housing 1. The outer guide roller 2 and the inner guide roller 21 are arranged in parallel to guide the strip.

[0041] Furthermore, the pressure roller 32 is located between the two inner guide rollers 21. The box body 1 is provided with an electric push rod 3 at the corresponding part of the pressure roller 32. The telescopic end of the electric push rod 3 is provided with a mounting frame 31. The pressure roller 32 is rotatably mounted on the mounting frame 31. A guide telescopic rod 33 connected to the mounting frame 31 is vertically provided on the box body 1.

[0042] Furthermore, a servo motor 4 is provided on the upper surface of the housing 1 corresponding to the fixed frame 5. The output shaft of the servo motor 4 is equipped with a lead screw 41 through a coupling. A threaded cylinder 51 is provided on the upper surface of the fixed frame 5 and is threadedly connected to the lead screw 41. An auxiliary telescopic rod 56 connected to the fixed frame 5 is vertically provided on the housing 1.

[0043] Furthermore, a horizontal plate 6 is provided on the upper part of the outer side surface of the box body 1 corresponding to one of the strip holes. A row of infrared temperature sensors 61 are evenly arranged on the horizontal plate 6 to detect the temperature of a line along the entire width of the strip. The infrared temperature sensors 61 perform online real-time detection of the final temperature of the strip surface that is about to leave the cooling box.

[0044] Furthermore, the top of the housing 1 is provided with an exhaust pipe 7, and the side of the housing 1 is provided with a cold oil inlet pipe and a hot oil outlet pipe. The external cold rolling oil delivery pump is connected to the cold oil inlet pipe, and the rolling mill oil cooling device is connected to the hot oil outlet pipe, forming a complete and circulatory rolling oil cooling circuit.

[0045] Furthermore, the cold air duct assembly includes an upper air duct 81 and a lower air duct 83. The upper air duct 81 is installed at the end of the inner cavity of the housing 1 and is located above the strip hole, while the lower air duct 83 is installed at the end of the inner cavity of the housing 1 and is located below the strip hole. The upper air duct 81 is provided with an upper nozzle 82 that blows towards the upper surface of the strip, and the lower air duct 83 is provided with a lower nozzle 84 that blows towards the lower surface of the strip. The outer side of the housing 1 is provided with a cold air duct 8 that connects to the upper air duct 81 and the lower air duct 83 for connecting to an external cold air fan.

[0046] A cooling method for implementing an online cooling device for reversible strip rolling includes the following steps:

[0047] S1. Two boxes 1 are symmetrically arranged between the uncoiling machine and the rolling mill and between the coiling machine and the rolling mill, respectively, forming symmetrical cooling stations on the outlet and inlet sides of the rolling line; rolling oil of a predetermined liquid level is injected into the box 1 to ensure that its liquid level is sufficient to submerge the passing strip; the external cold rolling oil delivery pump is connected to the cold oil inlet pipe, and the rolling mill oil cooling device is connected to the hot oil outlet pipe to form a complete and circulatory rolling oil cooling circuit.

[0048] S2. Forward rolling cooling and quality control process:

[0049] S21. The rolled strip enters through the slotted hole at the inlet end of box 1 and exits through the slotted hole at the outlet end, as shown. Figure 8 As shown; during this process, the electric push rod 3 near the inlet end strip hole extends, thereby pushing the mounting frame 31 and the pressure roller 32 downward, forcing the rolled strip to change its running trajectory, so that it can be fully immersed in the rolling oil for preliminary and efficient heat exchange and cooling.

[0050] S22. After the cooled strip is guided out of the liquid surface by the inner guide roller 21 and the outer guide roller 2 at the exit end, the upper air pipe 81 sprays low-temperature cold air downward through the upper nozzle 82 to simultaneously blow and cool the upper surface of the strip. At the same time, the lower air pipe 83 blows and cools the lower surface of the strip in the same way through the lower nozzle 84, thereby efficiently removing the rolling oil remaining on the surface of the strip and further reducing the temperature of the strip.

[0051] S23. After the cooled strip is removed from the rolling oil surface, its upper surface contacts the detection wheel 53 and drives the detection wheel 53 to rotate. When there are wavy or warped defects on the surface of the strip, the defective part is concave downward under the action of the surface tension and fluid dynamics of the rolling oil, resulting in poor contact between the detection wheel 53 corresponding to the defective part and the strip, so that it cannot rotate or the rotation speed is significantly reduced. By detecting the change in the rotation speed of the corresponding detection wheel 53 in real time by the Hall sensor 54, it is possible to accurately determine whether there are wavy or warped defects on the surface of the strip and their approximate location.

[0052] S3. When the cooled strip completes the current winding and is subjected to reverse rolling, a cooling path switching process is executed, such as... Figure 9 As shown; at this time, first control the electric push rod 3 at the original outlet end of box 1 to extend, so that it becomes a new immersion cooling end, and simultaneously control the electric push rod 3 at the original inlet end of box 1 to shorten, so that it becomes a new guide outlet end; during the reverse rolling process, the strip passes through the rolling oil in box 1 again in the opposite direction for cooling and air cooling, and then enters the rolling mill for the next rolling pass.

[0053] Furthermore, in S2, after the cooled strip is guided by the inner guide roller 21 and the outer guide roller 2 at the exit end, the infrared temperature sensor 61 performs online real-time detection of the final surface temperature of the strip about to leave the cooling box; such as Figure 10As shown, when the detected temperature is higher than the preset target value, the servo motor 4 is controlled to work. The servo motor 4 drives the lead screw 41 to rotate, which in turn causes the threaded cylinder 51 meshing with the lead screw 41 to drive the fixed frame 5 to move smoothly downward along the length of the auxiliary telescopic rod 56. The fixed frame 5 ultimately drives the detection wheel 53 to move downward synchronously through the fixed shaft 52. The detection wheel 53 then applies controllable downward pressure to the strip passing through, thereby increasing the sag of the strip in the box, effectively increasing the immersion length and cooling time of the strip in the rolling oil, realizing dynamic and precise adjustment of the cooling intensity until the strip temperature returns to the target range.

[0054] This invention constructs a bidirectional cooling channel by symmetrically arranging online cooling devices on the inlet and outlet sides of the rolling mill. It adopts a composite cooling method of rolling oil immersion cooling and cold air jet cooling, which can instantly and effectively cool the rolled strip. It can also detect strip surface defects such as wavy and warped strips. It has multiple functions and is easy to use.

[0055] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for implementing on-line cooling of reversible strip rolling, comprising a tank (1) for storing rolling oil, characterized in that: The box (1) is provided with a strip-shaped hole on both ends of the upper end, the box (1) is provided with a guide roller group for guiding the strip material at the position corresponding to the strip-shaped hole, the inside of the box (1) is symmetrically provided with a pressure roller (32) capable of moving up and down on both sides, which is used for pressing the strip material into the rolling oil for cooling, the inside of the box (1) is provided with a cold air pipe group at both ends, which is used for blowing and air cooling the rolling oil on the surface of the strip material, and the inside of the box (1) is provided with a fixed frame (5) capable of moving up and down, the side surface of the fixed frame (5) is provided with a fixed shaft (52) at the lower end, the fixed shaft (52) is rotatably provided with evenly distributed detection wheels (53), which are used for detecting the surface defects of the strip material, the inside edge of the detection wheel (53) is provided with a magnet piece (55), and the bottom of the fixed frame (5) corresponding to the magnet piece (55) is provided with a hall sensor (54) for detecting whether the detection wheel (53) rotates.

2. The device for online cooling of strip reversible rolling according to claim 1, characterized in that: The guide roller group includes an inner guide roller (21) mounted on the inside of the box (1) and an outer guide roller (2) mounted on the outside of the box (1), and the outer guide roller (2) and the inner guide roller (21) are arranged in parallel.

3. The device for online cooling of strip reversible rolling according to claim 2, characterized in that: The pressure roller (32) is located between the two inner guide rollers (21), and the box (1) is provided with an electric push rod (3) at the position corresponding to the pressure roller (32), the telescopic end of the electric push rod (3) is provided with a mounting bracket (31), the pressure roller (32) is rotatably arranged on the mounting bracket (31), and the box (1) is vertically provided with a guide telescopic rod (33) connected with the mounting bracket (31).

4. The device for on-line cooling of strip reversible rolling according to claim 3, characterized in that: The upper surface of the box (1) corresponding to the fixed frame (5) is provided with a servo motor (4), the output shaft of the servo motor (4) is provided with a lead screw (41) through a shaft coupling, the upper surface of the fixed frame (5) is provided with a threaded barrel (51) threadedly connected with the lead screw (41), and the box (1) is vertically provided with an auxiliary telescopic rod (56) connected with the fixed frame (5).

5. The device for on-line cooling of strip reversible rolling according to claim 4, characterized in that: The upper end of the outer side surface of the box (1) corresponding to one side of the strip-shaped hole is provided with a horizontal plate (6), and a row of infrared temperature sensors (61) are evenly arranged on the horizontal plate (6) for detecting the temperature of a line in the whole width direction of the strip material.

6. The device for on-line cooling of strip reversible rolling according to claim 5, characterized in that: The top of the box (1) is provided with an exhaust pipe (7), and the side surface of the box (1) is provided with a cold oil inlet pipe and a hot oil outlet pipe.

7. The device for on-line cooling of strip reversible rolling according to claim 6, characterized by the fact that: The cold air pipe group includes an upper air pipe (81) and a lower air pipe (83), the upper air pipe (81) is mounted at the end of the inner cavity of the box (1) and located on the upper side of the strip-shaped hole, the lower air pipe (83) is mounted at the end of the inner cavity of the box (1) and located on the lower side of the strip-shaped hole, the upper air pipe (81) is provided with an upper nozzle (82) blowing to the upper surface of the strip material, the lower air pipe (83) is provided with a lower nozzle (84) blowing to the lower surface of the strip material, and the outer side of the box (1) is provided with a cold air pipe (8) connected with the upper air pipe (81) and the lower air pipe (83) for connecting the external cold air machine.

8. A cooling method for implementing an on-line cooling device for reversible strip rolling according to claim 7, characterized in that: The method comprises the following steps: S1, two boxes (1) are respectively arranged symmetrically between the unwinding machine and the rolling mill and between the winding machine and the rolling mill, forming a symmetric cooling station at the outlet and inlet side of the rolling line; a predetermined liquid level of rolling oil is injected into the box (1) to ensure that the liquid surface is sufficient to submerge the passing strip, and the external cold rolling oil delivery pump is connected with the cold oil inlet pipe, and the rolling mill oil cooling device is connected with the hot oil outlet pipe, forming a complete and recyclable rolling oil cooling circuit; S2, forward rolling cooling and quality control process: S21, the rolled strip enters from the strip-shaped hole at the inlet end of the box (1) and moves out from the strip-shaped hole at the outlet end; in this process, the electric push rod (3) near the inlet end strip-shaped hole is elongated, thereby pushing the mounting frame (31) and the compression roller (32) to move downward, forcing the rolled strip to change its running track so that it can be fully immersed in the rolling oil for preliminary and efficient heat exchange cooling; S22, after the cooled strip is guided out of the liquid surface by the inner guide roller (21) and the outer guide roller (2) at the outlet end, the upper air pipe (81) sprays low-temperature cold air downward through the upper nozzle (82) to synchronously sweep and secondarily cool the upper surface of the strip, while the lower air pipe (83) sprays low-temperature cold air through the lower nozzle (84) to the lower surface of the strip, thereby efficiently removing the residual rolling oil on the surface of the strip and further reducing the temperature of the strip; S23, after the cooled strip moves out of the rolling oil liquid surface, its upper surface contacts the detection wheel (53) and drives the detection wheel (53) to rotate; when there are waves and warping defects on the surface of the strip, the defect part is depressed downward under the action of the surface tension and fluid dynamics of the rolling oil, resulting in poor contact between the detection wheel (53) corresponding to the defect part and the strip, so that the detection wheel (53) cannot rotate or the rotating speed is significantly reduced; By detecting the change of the rotating speed of the corresponding detection wheel (53) in real time through the Hall sensor (54), it can be accurately judged whether there are waves and warping defects on the surface of the strip and their approximate positions; S3, when the cooled strip completes the current pass and is rolled in reverse, the switching process of the cooling path is performed; at this time, the electric push rod (3) at the original outlet end of the box (1) is first controlled to elongate, so that it is converted into a new immersion cooling end, and the electric push rod (3) at the original inlet end of the box (1) is controlled to shorten at the same time, so that it is converted into a new guide outlet end; in the reverse rolling process, the strip passes through the rolling oil in the box (1) again for cooling and air cooling, and enters the rolling mill for the next pass rolling.

9. The cooling method for implementing an on-line cooling device of strip reversible rolling according to claim 8, characterized in that: In S2, the cooled strip is guided through the inner guide roller (21) and the outer guide roller (2) at the exit end, and the infrared temperature sensor (61) detects the final temperature of the strip surface in real time online; when the detected temperature is higher than the preset target value, the servo motor (4) is controlled to work, the servo motor (4) drives the screw rod (41) to rotate, and then the screw rod (41) drives the fixed frame (5) to move down along the length direction of the auxiliary telescopic rod (56) stably, the fixed frame (5) drives the detection wheel (53) to move down synchronously through the fixed shaft (52), and the detection wheel (53) controls the downward pressure on the passing strip, thereby increasing the sag of the strip in the box, effectively increasing the immersion length and cooling time of the strip in the rolling oil, and achieving dynamic and accurate adjustment of the cooling intensity until the strip temperature returns to the target interval.

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