A cleaning method and equipment for cold-rolled substrates that are oil-free and rust-free

Abstract

This application relates to the field of surface treatment of steel plates, and in particular to a cleaning method for cold-rolled substrates that do not require oil coating and do not rust, specifically including the following steps: The substrate after cold rolling is transported through the first row of nozzles spraying alkaline solution, and then the substrate passes through the first air pipe blowing out air flow; The substrate is sequentially transported through several rows of nozzles and several air pipes according to the aforementioned steps; The substrate is transported through several rows of nozzles spraying clear water towards the substrate; The substrate is transported closely past the roller that can adsorb clear water; The substrate is transported through the air pipe that can send out heated air flow for drying, so that the substrate can obtain a sufficient and effective cleaning effect.

Description

Technical Field

[0001] The present application relates to the field of steel plate surface treatment, and in particular to a cleaning method and equipment for cold-rolled substrates that do not require oil coating and do not rust. Background Art

[0002] Cold-rolled steel plates are generally oil-coated to prevent rust. However, the oil-coated steel plates affect the appearance and subsequent use. Therefore, it is necessary to treat the cold-rolled steel plates to prevent rust without oil coating. The methods for preventing rust without oil coating on cold-rolled steel plates can be film coating, painting, or film laminating, etc. During the cold rolling process, the substrate of the cold-rolled steel plate needs to be oil-coated to prevent damage to the substrate. Therefore, before the cold-rolled steel plate is treated to prevent rust without oil coating, it needs to be cleaned to remove the oil stains on the surface of the substrate after cold rolling.

[0003] There is a prior art of a production process for oil-free pre-coated steel plates with the publication number CN111229572A. On the cold-rolled formed steel plate, alkali solution is first sprayed and brushed with a brush roller to remove the oil stains, and then the steel plate is washed multiple times with clean water to remove the residual alkali solution on the steel plate.

[0004] Regarding the above related technologies, it is difficult to make the heavy oil stains existing on the surface of the substrate fully dissolve and react to be cleaned up by spraying alkali solution on the substrate, and when the brush roller is used to clean the heavy oil stains, it is easy to carry a lot of oil stains by itself. After being used for a period of time, the cleaning effect is limited, and it is difficult to continuously and effectively clean and remove the heavy oil stains on the surface of the substrate. Summary of the Invention

[0005] In order to continuously and effectively clean and remove the heavy oil stains on the surface of the substrate, the present application provides a cleaning method and equipment for cold-rolled substrates that do not require oil coating and do not rust.

[0006] A cleaning method for cold-rolled substrates that do not require oil coating and do not rust provided by the present application adopts the following technical solutions.

[0007] A cleaning method for cold-rolled substrates that do not require oil coating and do not rust specifically includes the following steps.

[0008] Step 1: Transfer the cold-rolled formed substrate through the first row of nozzles for spraying alkali solution, and then the substrate passes through the first air pipe for blowing out air flow;

[0009] Step 2: Transfer the substrate through several rows of nozzles and several air pipes in sequence according to Step 1;

[0010] Step 3: Transfer the substrate through several rows of nozzles for spraying clean water towards the substrate;

[0011] Step 4: Transfer the substrate closely past the roller that can adsorb clean water;

[0012] Step 5: Transfer the substrate through the air pipe that can send out hot air flow for drying.

[0013] By adopting the above technical solution, after the alkali solution is sprayed on one side of the substrate each time, high-pressure air flow will be ejected from the corresponding air pipe to blow off the oil stains and alkali solution dissolved by reaction on the substrate, and then new alkali solution will be sprayed and repeated several times, so that the alkali solution sprayed on the substrate subsequently can effectively remove the heavy oil stains on the substrate, reducing the possibility that a large amount of alkali solution sprayed on the substrate at one time cannot fully react with the oil stains on the substrate. And after spraying clean water on the substrate, corresponding roller lamination is carried out to adsorb the clean water, so that the oil stains are not easily left on the roller to cause secondary oil stain pollution to the substrate, and the substrate can be dried in time after the surface is cleaned, so as to carry out rust prevention treatment on the subsequent substrate surface.

[0014] The present application also provides a cold-rolled substrate cleaning device for oil-free and non-rusting use, which adopts the following technical solution.

[0015] A cold-rolled substrate cleaning device for oil-free and non-rusting use, which is used according to the above-mentioned cold-rolled substrate cleaning method for oil-free and non-rusting use, includes several cleaning parts capable of cleaning the substrate surface with alkali solution, a clean water nozzle located after the cleaning parts and spraying clean water to remove the residual alkali solution on the substrate, a clean water suction roller located after the clean water nozzle and capable of tightly adhering to the substrate surface to adsorb the residual clean water, and a drying pipe located after the clean water suction roller and sending hot air flow to the substrate. Each group of cleaning parts includes an alkali solution nozzle for sending alkali solution to the substrate and a blowing pipe for ejecting air flow to blow off the alkali solution and part of the oil stains on the substrate from the substrate. The blowing pipe is located behind the alkali solution nozzle along the substrate conveying direction.

[0016] By adopting the above technical solution, a continuous and effective oil stain cleaning effect can be obtained when processing a batch of substrates.

[0017] Optionally, the alkali solution nozzle sprays heated alkali solution on the substrate, and the blowing pipe sends heated air flow to the substrate.

[0018] By adopting the above technical solution, the substrate is heated so that the oil stains on the substrate surface can be more easily dissolved and reacted by the alkali solution.

[0019] Optionally, the clean water nozzle is arranged on the frame plate, and the frame plate is rotatably connected with several conveying rollers for pressing against the substrate to convey the substrate, and the conveying rollers can heat the substrate.

[0020] By adopting the above technical solution, the temperature of the substrate is further increased to adapt to the oil removal treatment of the substrate in the case of lower air temperature.

[0021] Optionally, an oil stain suction roller capable of tightly adhering to the substrate and rotating is arranged between the alkali solution nozzle and the blowing pipe close to the clean water nozzle, and the oil stain suction roller is provided with an oil removal device for removing the oil stains adsorbed by the oil stain suction roller.

[0022] By adopting the above technical solution, after the last spraying of the alkaline solution on the substrate, the oil-absorbing roller closely adheres to the surface of the substrate, ensuring that almost no oil remains on the substrate, improving the effectiveness of oil removal, and also reducing the maintenance and replacement frequency of the oil-absorbing roller.

[0023] Optionally, the oil removal device includes an alkaline solution tank for the oil-absorbing roller to enter from the side away from the substrate, a brush roller inside the tank that is rotatably connected inside the alkaline solution tank and closely adheres to the oil-absorbing roller, and an oil removal motor provided in the alkaline solution tank to drive the oil-absorbing roller and the brush roller inside the tank to rotate.

[0024] By adopting the above technical solution, after the oil-absorbing roller adsorbs and wipes off the possibly remaining oil on the substrate and then enters the alkaline solution tank, the alkaline solution tank fully dissolves and reacts with the oil adhering to the oil-absorbing roller. The brush roller inside the tank can better remove the oil existing on the surface of the oil-absorbing roller, making it less likely for the side of the oil-absorbing roller that rotates away from the alkaline solution tank and adheres to the surface of the substrate to cause secondary oil pollution to the surface of the substrate.

[0025] Optionally, both the brush roller inside the tank and the oil-absorbing roller are coaxially fixedly connected with roller gears, and the output shaft of the oil removal motor is coaxially fixedly connected with a motor gear, and the motor gear meshes with the two roller gears.

[0026] By adopting the above technical solution, the brush roller inside the tank and the oil-absorbing roller rotate in opposite directions, improving the sufficiency of removing the oil adhering to the surface of the oil-absorbing roller.

[0027] Optionally, a pressure roller that tightly presses on the oil-absorbing roller is rotatably connected inside the alkaline solution tank, and the pressure roller is located behind the brush roller inside the tank in the direction of rotation of the oil-absorbing roller.

[0028] By adopting the above technical solution, the clear water mixed with oil adsorbed inside the oil-absorbing roller can be squeezed out and enter the alkaline solution tank, making it less likely for a large amount of oil to remain inside the oil-absorbing roller, so that the subsequent clear water can better clean the surface of the substrate.

[0029] Optionally, the rotation direction of the clear water-absorbing roller and the oil-absorbing roller on the side close to the substrate is opposite to the transmission direction of the substrate.

[0030] By adopting the above technical solution, the clear water-absorbing roller and the oil-absorbing roller can play a better role in frictionally scraping the surface of the substrate, improving the cleanliness of the surface of the substrate.

[0031] Optionally, a water squeezing roller is closely attached to the side of the clear water-absorbing roller that is away from the substrate in the direction of its own rotation. One side of the water squeezing roller is rotatably connected to a guide plate that is fixed in position and allows the liquid squeezed out by the clear water-absorbing roller to flow in a specific direction. A liquid receiving channel for receiving the liquid flowing upstream and downstream of the water squeezing roller is provided on the side of the guide plate away from the water squeezing roller.

[0032] By adopting the above technical solution, after a certain amount of water is adsorbed by the clean water suction roller and it rotates to the water squeezing roller, the adsorbed water can be squeezed out and fall onto the guide plate, and flow along the guide plate to the liquid receiving channel, so that the clean water suction roller can continuously and effectively suck away the clean water on the substrate, thereby improving the subsequent drying effect of the substrate.

[0033] In summary, the present application includes at least one of the following beneficial effects:

[0034] 1. After each side of the substrate is sprayed with the lye, high-pressure air flow is ejected from the corresponding air pipe to blow off the oil stains and lye dissolved by the reaction on the substrate, and then new lye is sprayed, and this is repeated several times, so that the lye sprayed onto the substrate subsequently can effectively remove the heavy oil stains on the substrate, reducing the possibility that a large amount of lye sprayed onto the substrate at one time cannot fully react with the oil stains on the substrate;

[0035] 2. The substrate is heated to make the oil stains on the surface of the substrate more easily dissolved and reacted by the lye. Description of the Drawings

[0036] Figure 1 is a schematic structural diagram of a cleaning device for an oil-free and non-rusting cold-rolled substrate of the present application;

[0037] Figure 2 is a schematic structural diagram with one side frame plate removed and showing the part between the oil stain suction roller and the clean water suction roller;

[0038] Figure 3 is Figure 1 the enlarged view at A in

[0039] Description of the reference numerals: 1. Cleaning part; 2. Clean water spray head; 3. Clean water suction roller; 4. Drying pipe; 41. Motor gear; 42. Pressing roller; 43. Water squeezing roller; 44. Liquid receiving channel; 46. Guide plate; 47. Conveyor roller motor; 48. Suction roller motor; 5. Lye spray head; 51. Blowing-off pipe; 52. Frame plate; 53. Conveyor roller; 54. Oil stain suction roller; 55. Oil removal device; 56. Lye tank; 57. Brush roller inside the tank; 58. Oil removal motor; 59. Roller gear. Detailed Embodiment

[0040] The following further describes the present application in detail with reference to the drawings.

[0041] The embodiment of the present application discloses a cleaning method for an oil-free and non-rusting cold-rolled substrate, which specifically includes the following steps.

[0042] Step 1: Transmit the cold-rolled formed substrate through the first row of lye spray nozzles, and then the substrate passes through the first air pipe that blows out air flow;

[0043] Step 2: Convey the substrate successively past several rows of nozzles and several air pipes according to Step 1;

[0044] Step 3: Convey the substrate past several rows of nozzles that spray clean water towards the substrate;

[0045] Step 4: Convey the substrate closely past a roller that can adsorb clean water;

[0046] Step 5: Convey the substrate past an air pipe that can send out hot air flow for drying.

[0047] The implementation principle of a cleaning method for an oil-free and non-rusting cold-rolled substrate in an embodiment of the present application is as follows: After the substrate is sprayed with lye on one side, high-pressure air flow is ejected from the corresponding air pipe to blow off the oil stains and lye dissolved by the reaction on the substrate, and then new lye is sprayed, and this is repeated several times, so that the lye sprayed onto the substrate subsequently can effectively remove the heavy oil stains on the substrate, reducing the possibility that a large amount of lye sprayed onto the substrate at one time cannot fully react with the oil stains on the substrate.

[0048] An embodiment of the present application also discloses a cleaning device for an oil-free and non-rusting cold-rolled substrate, which is used according to the above-mentioned cleaning method for an oil-free and non-rusting cold-rolled substrate. Refer to Figure 1 , including a vertical frame plate 52. The frame plate 52 is rotatably connected with several groups of conveying rollers 53. The connecting direction of adjacent two groups of conveying rollers 53 is consistent with the length direction of the frame plate 52. Each group of conveying rollers 53 is arranged vertically in two. The substrate passes through two conveying rollers 53 in the same group, and at least one substrate is simultaneously pressed and conveyed by two groups of conveying rollers 53. Corresponding to each group of conveying rollers 53 on the outer side of the frame plate 52, a conveying roller motor 47 is fixedly connected. The output shaft of the conveying roller motor 47 is coaxially fixedly connected to one conveying roller 53. And the inside of each conveying roller 53 communicates with an external pipeline to circulate high-temperature heat-conducting liquid, so that the conveying roller 53 has a relatively high temperature, so that the substrate can obtain a certain amount of heat when passing through the conveying roller 53, increasing the temperature of the substrate, so as to more effectively remove the oil stains on the substrate.

[0049] Refer to Figure 1The frame plate 52 is provided with several cleaning sections 1, each of which is located between two adjacent groups of conveying rollers 53. Each cleaning section 1 includes a row of alkali liquid nozzles 5 and a blow-down pipe 51 fixedly connected to the frame plate 52. The length direction of the row of alkali liquid nozzles 5 is consistent with the axial direction of the conveying roller 53. The alkali liquid nozzles 5 are connected to an external water tank with an electric heating rod and filled with alkali liquid through an external pipeline and are equipped with a high-pressure water pump, so that the alkali liquid nozzles 5 spray alkali liquid, such as sodium carbonate solution and sodium hydroxide solution, onto the upper surface of the substrate to react and dissolve the oil stains on the surface of the substrate. The length direction of the blow-off pipe 51 is consistent with the axial direction of the conveying roller 53. The blow-off pipe 51 is located behind the corresponding alkali solution nozzle 5 in the direction of the substrate movement. The blow-off pipe 51 is connected to the external air compressor and the air heat exchanger to spray hot air toward the substrate. The direction of the airflow blown out by the blow-off pipe 51 deviates from the moving direction of the substrate, so that the alkali solution on the surface of the unreacted and dissolved oil stains on the substrate is mixed with the reacted and dissolved oil stains to be blown off, so that after the substrate is cleaned by several cleaning parts 1, the heavy oil stains on the surface of the substrate can be fully and effectively removed.

[0050] Reference Figure 1 and Figure 2 An oil suction roller 54 is installed between the last alkali solution spray head 5 and the blow-down pipe 51 in accordance with the moving direction of the substrate. The oil suction roller 54 can be rotatably connected to the substrate and closely attached to the upper surface of the substrate. The surface of the oil suction roller 54 can be an oil-absorbing non-woven fabric of a certain thickness, so that after the last alkali solution is sprayed on the substrate, the oil suction roller 54 can remove some oil stains that may remain on the substrate. The oil suction roller 54 is provided with an oil removal device 55 that can remove the oil stains absorbed by the oil suction roller 54. The oil removal device 55 includes an alkali solution tank 56 fixedly connected to the frame plate 52. There is alkali solution in the alkali solution tank 56. The upper part of the oil suction roller 54 is located in the alkali solution tank 56, so that the oil stains absorbed by the oil suction roller 54 can react and dissolve after entering the alkali solution tank 56. A brush roller 57 is rotatably connected in the alkali liquid tank 56. The axis direction of the brush roller 57 is the same as that of the oil-stain suction roller 54. The bristles densely distributed on the surface of the brush roller 57 remove the heavy oil that may be attached to the surface of the oil-stain suction roller 54, so that the oil-stain suction roller 54 is not likely to cause secondary pollution to the substrate. A pressure roller 42 is rotatably connected in the alkali liquid tank 56. The axis direction of the brush roller 57 is the same as that of the pressure roller 42. The pressure roller 42 can be closely attached to the oil-stain suction roller 54, so that the oil adsorbed in the oil-stain suction roller 54 is discharged, so that the oil-stain suction roller 54 can effectively adsorb the residual oil on the substrate.

[0051] Reference Figure 1 and Figure 3, the degreasing device 55 further includes a degreasing motor 58 fixedly connected to the lye tank 56 and located outside the frame plate 52. The output shaft of the degreasing motor 58 is coaxially and fixedly connected with a motor gear 41. Both the inner tank brush roller 57 and the oil stain suction roller 54 are coaxially and fixedly connected with a roller gear 59. The roller gear 59 is located outside the frame plate 52. The motor gear 41 meshes with the two roller gears 59, so that the inner tank brush roller 57 and the oil stain suction roller 54 rotate in opposite directions, enabling the inner tank brush roller 57 to effectively brush off the heavy oil stains on the surface of the oil stain suction roller 54. And the rotation direction of the oil stain suction roller 54 close to one side of the substrate is opposite to the moving direction of the substrate, so that the oil stain suction roller 54 can more effectively remove the oil stains on the substrate.

[0052] Refer to Figure 1 and Figure 2 , between two adjacent sets of conveying rollers 53 located behind the cleaning section 1 along the moving direction of the substrate, a clear water spray head 2 is installed. The clear water spray heads 2 are evenly distributed in several rows along the length direction of the frame plate 52. The clear water spray heads 2 are connected to a clear water tank with an electric heating rod and a high-pressure water pump arranged outside through pipelines, so that the clear water spray heads 2 spray hot clear water onto the upper surface of the substrate to clean the residual lye on the upper surface of the substrate. Between two adjacent sets of conveying rollers 53 located behind the cleaning section 1 along the moving direction of the substrate, a clear water suction roller 3 is installed. The clear water suction roller 3 is rotatably connected to the frame plate 52, and the axis direction of the clear water suction roller 3 is the same as the axis direction of the conveying roller 53. The surface layer of the clear water suction roller 3 can be a sponge. The clear water suction roller 3 is closely attached to the upper surface of the substrate so that the residual liquid on the substrate is adsorbed. The frame plate 52 is fixedly connected with a suction roller motor 48 whose output shaft is coaxially and fixedly connected. And the rotation direction of the clear water suction roller 3 close to one side of the substrate is opposite to the moving direction of the substrate. At the same time, behind the clear water suction roller 3 along the moving direction of the substrate, a drying pipe 4 is installed. The drying pipe 4 is connected to an external air compressor and an air heat exchanger, so that the drying pipe 4 sends high-temperature hot air towards the upper surface of the substrate to dry the substrate.

[0053] Refer to Figure 2, on the side of the water-absorbing roller 3 away from the substrate along its rotation direction, a water-squeezing roller 43 is attached. The water-squeezing roller 43 is rotatably connected to the frame plate 52. The water-squeezing roller 43 presses tightly against the water-absorbing roller 3 so that the water adsorbed in the water-absorbing roller 3 can be squeezed out. The frame plate 52 is fixedly connected with an inclined guide plate 46. The side of the guide plate 46 close to the outer circumferential wall of the water-absorbing roller 3 is the highest side of the guide plate 46. The connection line between the water-squeezing roller 43 and the water-absorbing roller 3 is horizontal, so that the water squeezed out by the water-squeezing roller 43 can flow onto the guide plate 46 better along the rotation direction of the water-absorbing roller 3. And even if a small part of the water cannot flow onto the guide plate 46 but flows onto the substrate, the water-absorbing roller 3 can adsorb the water again. A liquid receiving channel 44 is installed directly below the lower side of the guide plate 46. The liquid receiving channel 44 is inclined and the lower end extends outside the frame plate 52. And a box can be placed outside the frame plate 52 directly below the lowest position of the liquid receiving channel 44, so that the liquid receiving channel 44 can directly discharge the accumulated water.

[0054] In order to perform degreasing treatment on both the upper and lower surfaces of the substrate, after the substrate is first cleaned, the substrate can be turned over and then cleaned again.

[0055] The implementation principle of a cold-rolled substrate cleaning device without oil coating and non-rusting in the embodiment of the present application is as follows: The substrate first passes through several groups of cleaning parts 1 in sequence. The alkali liquid spray heads 5 in each group of cleaning parts 1 first spray alkali liquid onto the substrate, and then the blowing pipe 51 blows off the alkali liquid on the substrate together with the dissolved oil stains. When the substrate reaches the last group of cleaning parts 1, after the alkali liquid spray head 5 sprays alkali liquid onto the substrate, the oil stain absorbing roller 54 closely adheres to the substrate to wipe off some oil stains that may still remain on the substrate, and then the blowing pipe 51 blows off the alkali liquid on the substrate. When the substrate passes through all the cleaning parts 1, the clean water spray head 2 flushes the alkali liquid on the substrate away, and then the clean water absorbing roller 3 adsorbs the remaining clean water on the substrate. After that, the substrate passes through the drying pipe 4 for final drying.

[0056] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A cleaning method for cold-rolled substrate that is oil-free and rust-free, characterized in that: Specifically, it includes the following steps: Step 1: Transmit the cold-rolled formed substrate through the first row of nozzles spraying lye, and then the substrate passes through the first air pipe blowing out air flow; Step 2: Transmit the substrate through several rows of nozzles and several air pipes in sequence according to Step 1; Step 3: Transmit the substrate through several rows of nozzles spraying clear water towards the substrate; Step 4: Transmit the substrate closely past the roller capable of adsorbing clear water; Step 5: Transmit the substrate through the air pipe capable of sending out hot air flow for drying.

2. A cold-rolled substrate cleaning device that does not require oil coating and does not rust, which is used according to the cold-rolled substrate cleaning method described in claim 1, and is characterized in that: It includes several groups of cleaning parts (1) capable of cleaning the substrate surface with lye, the clear water nozzles (2) located after the cleaning parts (1) and spraying clear water to remove the residual lye on the substrate, the clear water suction roller (3) located after the clear water nozzles (2) and capable of closely adhering to the substrate surface to adsorb the residual clear water, the drying pipe (4) located after the clear water suction roller (3) and sending out hot air flow towards the substrate. Each group of cleaning parts (1) includes a lye nozzle (5) sending out lye towards the substrate and a blowing-off pipe (51) spraying air flow towards the substrate to blow off the lye and part of the oil stain on the substrate. The blowing-off pipe (51) is located after the lye nozzle (5) along the substrate transmission direction.

3. The cleaning equipment for cold-rolled substrate that is oil-free and non-rusting according to claim 2, wherein: The lye nozzle (5) sprays the heated lye towards the substrate, and the blowing-off pipe (51) sends out the heated air flow towards the substrate.

4. The cleaning equipment for cold-rolled substrates that is oil-free and rust-free according to claim 2, wherein: The clear water nozzles (2) are arranged on the frame plate (52). The frame plate (52) is rotatably connected with several groups of transmission rollers (53) pressing against the substrate for transmission. The transmission rollers (53) can heat the substrate.

5. A cleaning device for cold-rolled substrates that are oil-free and non-rusting according to claim 2, characterized in that: An oil stain suction roller (54) capable of rotating closely against the substrate is arranged between the lye nozzle (5) and the blowing-off pipe (51) close to the clear water nozzles (2). The oil stain suction roller (54) is provided with an oil removal device (55) for removing the oil stain adsorbed by the oil stain suction roller (54).

6. The cleaning equipment for cold-rolled substrate that is oil-free and non-rusting according to claim 5, wherein: The oil removal device (55) includes a lye tank (56) for the oil stain suction roller (54) to enter from the side far from the substrate, a brush roller (57) in the lye tank (56) rotatably connected and closely adhering to the oil stain suction roller (54), and an oil removal motor (58) arranged in the lye tank (56) and driving the oil stain suction roller (54) and the brush roller (57) in the lye tank to rotate.

7. The cleaning equipment for cold-rolled substrate that is oil-free and rust-free according to claim 6, wherein: Both the brush roller (57) in the lye tank and the oil stain suction roller (54) are coaxially and fixedly connected with roller gears (59). The output shaft of the oil removal motor (58) is coaxially and fixedly connected with a motor gear (41). The motor gear (41) meshes with the two roller gears (59).

8. An oil-free and non-rusting cold-rolled substrate cleaning device according to claim 6, characterized in that: A pressure roller (42) tightly pressing against the oil stain suction roller (54) is rotatably connected in the lye tank (56). The pressure roller (42) is located after the brush roller (57) in the lye tank along the rotation direction of the oil stain suction roller (54).

9. The cleaning equipment for cold-rolled substrate that is oil-free and rust-free according to claim 2, wherein: The rotation directions of the sides of the clear water suction roller (3) and the oil stain suction roller (54) close to the substrate are opposite to the substrate transmission direction.

10. The cleaning equipment for cold-rolled substrates that is oil-free and rust-free according to claim 6, characterized in that: A water squeezing roller (43) is closely adhered to the side of the clear water suction roller (3) far from the substrate along the rotation direction of the clear water suction roller (3). One side of the water squeezing roller (43) is rotatably connected with a guide plate (46) with a fixed position and for the liquid extruded by the clear water suction roller (3) to flow in a directional manner. A liquid receiving channel (44) for receiving the liquid flowing upstream and downstream of the water squeezing roller (43) is arranged on the side of the guide plate (46) far from the water squeezing roller (43).

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