Cold rolling machine oil mist collecting device and collecting method

Abstract

The cold rolling machine oil mist collecting device comprises oil mist collecting assemblies symmetrically arranged on the two sides of a rack, each oil mist collecting assembly comprises a fixed cover, one side of each fixed cover is fixedly connected with the rack, the other side of each fixed cover is fixedly connected with a movable cover, and a ventilation opening is formed in the side, close to the corresponding movable cover, of each fixed cover; the center of the top of the fixing cover is provided with a smoke exhaust air door, the top of the fixing cover is fixedly connected with a smoke exhaust pipeline, the smoke exhaust pipeline is located between the smoke exhaust air door and the rack, the smoke exhaust air door and the smoke exhaust pipeline are each provided with an air volume adjusting mechanism, and the bottom in the fixing cover is fixedly connected with a drained water collecting assembly. The invention further discloses a cold rolling machine oil mist collecting method. According to the cold rolling machine oil mist collecting device and method, the problems that according to an existing oil mist collecting device, oil mist collection is unbalanced, the efficiency is low, oil mist water is prone to being evaporated and condensed into oil drops, and the oil drops drip to the surface of a plate strip, and the plate surface quality is poor are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of strip steel cold rolling equipment, and in particular relates to an oil mist collection device for a cold rolling mill, and also comprises an oil mist collection method for a cold rolling mill. Background Art

[0002] When a single-stand cold rolling mill is rolling a strip, the strip at the roller outlet undergoes plastic deformation and becomes thinner, and a large amount of heat is generated in the deformation area of ​​the strip at the roller inlet. Therefore, a large amount of emulsion is used to spray the roller and the strip deformation area at high pressure to cool the roller and the strip. When the mill runs at high speed, when the linear speed of the roller surface and the strip contact surface is inconsistent, the strip surface will be scratched by the roller surface, affecting the quality of the strip surface. Therefore, the emulsion also contains a certain proportion of rolling oil, which will form an oil film between the roller and the strip to protect the strip surface. During rolling, the high temperature generated by the deformation of the strip causes the water in the emulsion to vaporize quickly, forming a steamy environment inside the rolling mill; at the same time, the emulsion of the high-pressure spray roller encounters the high-speed rotating roller. Under the combined effect of impact and centrifugal force, it splashes everywhere and then breaks into oil mist particles, which adhere to the surface of the equipment above the strip. As time goes by, the water gradually evaporates and condenses into oil droplets. Under the action of their own gravity, the oil droplets drip onto the high-temperature strip surface and quickly form an oil spot. In the subsequent processing links, the oil at the oil spot carbonizes, leaving difficult-to-remove black spots or color differences on the strip surface, which directly affects the surface quality of the strip and reduces the market competitiveness of the enterprise. Summary of the invention

[0003] The purpose of the present invention is to provide an oil mist collecting device for a cold rolling mill, which solves the problem of uneven oil mist collection in existing oil mist collecting devices.

[0004] Another object of the present invention is to provide a method for collecting oil mist from a cold rolling mill.

[0005] The technical solution adopted by the present invention is that the oil mist collection device of the cold rolling mill includes oil mist collection components symmetrically arranged on both sides of the frame, each group of oil mist collection components includes a fixed cover, one side of the fixed cover is fixedly connected to the frame, and the other side of the fixed cover is fixedly connected to a movable cover, a ventilation port is provided on the side of the fixed cover close to the movable cover, a smoke exhaust damper is provided at the top center of the fixed cover, a smoke exhaust duct is fixedly connected to the top of the fixed cover, the smoke exhaust damper and the frame are both provided with air volume adjustment mechanisms, and a drainage collection component is fixedly connected to the bottom of the fixed cover.

[0006] The present invention is also characterized in that: The fixed cover is a frame structure, and the fixed cover is welded with steel plates except the bottom surface.

[0007] A cylindrical pin and two wedges are fixedly connected to the top of the fixed cover, the movable cover is positioned by the cylindrical pin and the wedges, hooks are fixedly connected to both sides of the movable cover, and the movable cover is locked with the fixed cover by the hooks.

[0008] The smoke exhaust duct extends into the rolling mill, and a number of ventilation holes are opened at the end of the smoke exhaust duct to connect to the interior of the rolling mill. The top of the smoke exhaust damper is a square flange structure, and the top of the smoke exhaust damper is connected to the workshop exhaust duct by bolts.

[0009] The drain collection component includes a drain plate, which is a herringbone structure. The drain plate is fixed in a fixed cover by stud supports. The fixed cover and the drain plate form a closed cavity. A vent with a closed upper part and an open lower part is provided on the drain plate.

[0010] Both sides of the bottom of the fixed cover and the movable cover are fixedly connected with guide channel steels, the drain plates are connected to the guide channel steels through studs, and the guide channel steels are all set in a sloped direction.

[0011] Each vent on the smoke exhaust duct is provided with an air volume adjustment mechanism, which includes a wrench, and the wrench controls the rotation of the fan blades through a rotating shaft.

[0012] Another technical solution adopted by the present invention is a method for collecting oil mist from a cold rolling mill, using the above-mentioned oil mist collecting device for a cold rolling mill, and the steps are as follows: S1: After the water-gasoline mist is generated, each ventilating opening of the smoke exhaust duct is ventilated in different areas to draw the water-gasoline mist into the smoke exhaust duct; S2: Manually adjust the size of the fan blades and the vents of the air volume adjustment mechanism to control the wind pressure, and then adjust the size of the exhaust air volume of the corresponding smoke exhaust duct vents; S3: Adjust the extension length of the drain plate fixing studs, and then adjust the size of the air inlet of the fixed cover to complete the adjustment of the exhaust air volume of the fixed cover; S4: adjusting the size of the fan blades and the exhaust port of the air volume adjustment mechanism of the smoke exhaust damper, thereby adjusting the size of the exhaust port of the fixed cover to complete the exhaust air volume adjustment; S5: The water-gasoline mist in the fixed hood and the smoke exhaust duct passes through the smoke exhaust damper and is sent into the workshop exhaust duct.

[0013] The specific steps for regional ventilation are as follows: Use the vents that extend into the exhaust duct inside the rolling mill to extract most of the water-gasoline mist in the frame; use the vents on the drain plate to extract part of the water-gasoline mist escaping from both sides of the rolling mill; and use the vents on the left side of the fixed hood to extract a small part of the water vapor that reaches the movable hood.

[0014] By disassembling and installing the movable cover, the equipment below the movable cover is maintained, the extended length of the drain plate handle studs is adjusted to adjust the height of the drain plate, and the sludge in the guide channel steel is cleaned.

[0015] The beneficial effects of the present invention are: The oil mist collection device and collection method for a cold rolling mill provided by the present invention adopt a split installation and area collection structure. Most of the water-gasoline mist in the frame is extracted by using the vents extending into the exhaust duct inside the rolling mill. Part of the water-gasoline mist that escapes from both sides of the rolling mill is extracted by the vents on the drain plate. A small part of the water vapor that escapes to the movable cover is extracted by the vents on the left side of the fixed cover, and is sent into the exhaust duct of the workshop through the exhaust damper. This solves the problem that the existing oil mist collection device is uneven and inefficient, and the oil mist is prone to evaporation of water in the oil mist, condensation into oil droplets, and the oil droplets fall onto the surface of the plate and strip. This realizes the targeted collection of water-gasoline mist generated at different parts of the frame, improves the collection efficiency, and ensures that the oil mist and water vapor can be removed quickly and effectively, thereby reducing the residence time and diffusion range of the oil mist in the frame, which is convenient for subsequent treatment and discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric view of the left side of the oil mist collection device for a cold rolling mill of the present invention; Figure 2 The present invention Figure 1 The main view; Figure 3 The present invention Figure 2 AA view; Figure 4 The present invention Figure 3 BB view.

[0017] In the figure: 1. movable hood, 2. fixed hood, 3. smoke exhaust damper, 4. smoke exhaust duct, 5. air volume adjustment mechanism, 6. hook, 7. wedge, 8. cylindrical pin; 9. drain plate, 10. guide channel steel. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The oil mist collecting device for a cold rolling mill provided by the present invention is as follows: Figure 1 As shown, it includes oil mist collection components symmetrically arranged on both sides of the frame, each group of oil mist collection components includes a fixed cover 2, one side of the fixed cover 2 is fixedly connected to the frame, and the other side of the fixed cover 2 is fixedly connected to a movable cover 1, a ventilation port is provided on the side of the fixed cover 2 close to the movable cover 1, and a smoke exhaust damper 3 is provided at the top center of the fixed cover 2. The smoke exhaust damper 3 is a cylindrical structure welded with steel plates on all sides, which is used to discharge water and gasoline mist. A smoke exhaust duct 4 is fixedly connected to the top of the fixed cover 2, and the smoke exhaust duct 4 is located between the smoke exhaust damper 3 and the frame. The smoke exhaust damper 3 and the smoke exhaust duct 4 are both provided with an air volume adjustment mechanism 5, which can be manually adjusted according to the requirements of different areas. The size of the exhaust air volume of each part can be adjusted by changing the size of the ventilation port, and a drainage collection component is fixedly connected to the bottom of the fixed cover 2.

[0020] The fixed cover 2 is a frame structure. The fixed cover 2 is welded with steel plates except the bottom surface, which covers the top and five surfaces of the front, back, left and right to ensure sealing.

[0021] A cylindrical pin 8 and two wedge blocks 7 are fixed to the top of the fixed cover 2, and the movable cover 1 is positioned by the cylindrical pin 8 and the wedge blocks 7. Hooks 6 are fixed to both sides of the movable cover 1, and the movable cover 1 is locked with the fixed cover 2 by the hooks 6. During installation, the cylindrical pin 8 is used for rapid centering. During the falling process, the wedge blocks 7 slide on the inclined surface to tighten the movable cover 1 and the fixed cover 2, and then lock them with the hooks 6 for rapid positioning and installation. During maintenance, the movable cover 1 is quickly lifted away using the lifting ears on the top of the movable cover 1, and the equipment under the movable cover 1 is inspected and maintained.

[0022] like Figure 2 As shown, the smoke exhaust duct 4 extends into the rolling mill, and a plurality of ventilation holes are provided at the extending end of the smoke exhaust duct 4 to connect to the interior of the rolling mill. The top of the smoke exhaust damper 3 is a square flange structure, and the top of the smoke exhaust damper 3 is connected to the workshop exhaust duct by bolts.

[0023] like Figure 3 As shown, the drain collection assembly includes a drain plate 9, such as Figure 4 As shown, the drain plate 9 is a herringbone structure, which quickly diverts the emulsion falling from the fixed cover 2, and conveniently guides the emulsion falling on the drain plate 9 to the guide channel steel 10 on both sides of the fixed cover 2, and discharges it through the manual ball valve arranged at the lowest point of the guide channel steel 10. The drain plate 9 is fixed in the fixed cover 2 by stud supports, and the fixed cover 2 and the drain plate 9 form a closed cavity. The drain plate 9 is provided with a ventilating hole which is closed on the top and opened on the bottom, so that the air intake is stable at the bottom, and the emulsion flowing down from the top flows from both sides of the ventilating hole into the guide channel steel 10, which increases the air intake while avoiding the dripping of the emulsion.

[0024] Both sides of the bottom of the fixed cover 2 and the movable cover 1 are fixedly connected with guide channel steels 10, and the drain plate 9 is connected to the guide channel steels 10 through studs. The guide channel steels 10 are all set in a sloped direction to ensure that the collected emulsion can flow smoothly to the lowest point of the guide channel steels 10.

[0025] Each vent on the exhaust pipe 4 is provided with an air volume regulating mechanism 5, and the air volume regulating mechanism 5 includes a wrench, and the wrench controls the rotation of the fan blades through the rotating shaft. The cold rolling mill oil mist collection method provided by the present invention uses the above-mentioned cold rolling mill oil mist collection device, and the steps are as follows: S1: After the water-gasoline mist is generated, each ventilating opening of the smoke exhaust duct 4 is ventilated in different areas to draw the water-gasoline mist into the smoke exhaust duct 4; S2: Manually adjust the size of the fan blades and the vents of the air volume adjustment mechanism 5 to control the wind pressure, and then adjust the size of the exhaust air volume of the vents of the corresponding smoke exhaust duct 4; S3: Adjust the extension length of the fixing studs of the drain plate 9, and then adjust the size of the air inlet of the fixed cover 2 to complete the adjustment of the exhaust air volume of the fixed cover 2.

[0026] S4: Adjust the size of the fan blades and the exhaust port of the air volume adjustment mechanism 5 of the smoke exhaust damper 3, thereby adjusting the size of the exhaust port of the fixed cover 2 to complete the exhaust air volume adjustment.

[0027] S5: The water-gasoline mist in the fixed hood 2 and the smoke exhaust duct 4 passes through the smoke exhaust damper 3, and the water-gasoline mist is sent into the workshop exhaust duct.

[0028] The specific steps for regional ventilation are as follows: Use the vents extending into the exhaust duct 4 inside the rolling mill to extract most of the water-gasoline mist in the frame, use the vents on the drain plate 9 to extract part of the water-gasoline mist escaping from both sides of the rolling mill, and use the vents on the left side of the fixed cover 2 to extract a small part of the water vapor reaching the movable cover 1.

[0029] By disassembling and installing the movable cover 1, the equipment below the movable cover 1 is maintained, the extended length of the studs of the drain plate 9 is adjusted to adjust the height of the drain plate 9, and the sludge in the guide channel steel 10 is cleaned.

[0030] Example 1 The cold rolling mill oil mist collection device proposed in this embodiment is as follows: Figure 1 As shown, it includes oil mist collection components symmetrically arranged on both sides of the frame, each group of oil mist collection components includes a fixed cover 2, one side of the fixed cover 2 is fixedly connected to the frame, and the other side of the fixed cover 2 is fixedly connected to a movable cover 1, a ventilation port is provided on the side of the fixed cover 2 close to the movable cover 1, a smoke exhaust damper 3 is provided at the top center of the fixed cover 2, a smoke exhaust duct 4 is fixedly connected to the top of the fixed cover 2, the smoke exhaust damper 3 and the frame are located, the smoke exhaust damper 3 and the smoke exhaust duct 4 are both provided with an air volume adjustment mechanism 5, and a drainage collection component is fixedly connected to the bottom of the fixed cover 2.

[0031] Example 2 The cold rolling mill oil mist collection device proposed in this embodiment is as follows: Figure 1 As shown, it includes oil mist collection components symmetrically arranged on both sides of the frame, each group of oil mist collection components includes a fixed cover 2, one side of the fixed cover 2 is fixedly connected to the frame, and the other side of the fixed cover 2 is fixedly connected to a movable cover 1, a ventilation port is provided on the side of the fixed cover 2 close to the movable cover 1, a smoke exhaust damper 3 is provided at the top center of the fixed cover 2, a smoke exhaust duct 4 is fixedly connected to the top of the fixed cover 2, the smoke exhaust damper 3 and the frame are located, the smoke exhaust damper 3 and the smoke exhaust duct 4 are both provided with an air volume adjustment mechanism 5, and a drainage collection component is fixedly connected to the bottom of the fixed cover 2.

[0032] The fixed cover 2 is a frame structure, and the fixed cover 2 is welded with steel plates except for the bottom surface.

[0033] A cylindrical pin 8 and two wedges 7 are fixedly connected to the top of the fixed cover 2 , the movable cover 1 is positioned by the cylindrical pin 8 and the wedges 7 , hooks 6 are fixedly connected to both sides of the movable cover 1 , and the movable cover 1 is locked with the fixed cover 2 by the hooks 6 .

[0034] Example 3 The cold rolling mill oil mist collection device proposed in this embodiment is as follows: Figure 1 As shown, it includes oil mist collection components symmetrically arranged on both sides of the frame, each group of oil mist collection components includes a fixed cover 2, one side of the fixed cover 2 is fixedly connected to the frame, and the other side of the fixed cover 2 is fixedly connected to a movable cover 1, a ventilation port is provided on the side of the fixed cover 2 close to the movable cover 1, a smoke exhaust damper 3 is provided at the top center of the fixed cover 2, a smoke exhaust duct 4 is fixedly connected to the top of the fixed cover 2, the smoke exhaust damper 3 and the frame are located, the smoke exhaust damper 3 and the smoke exhaust duct 4 are both provided with an air volume adjustment mechanism 5, and a drainage collection component is fixedly connected to the bottom of the fixed cover 2.

[0035] The fixed cover 2 is a frame structure, and the fixed cover 2 is welded with steel plates except for the bottom surface.

[0036] A cylindrical pin 8 and two wedges 7 are fixedly connected to the top of the fixed cover 2 , the movable cover 1 is positioned by the cylindrical pin 8 and the wedges 7 , hooks 6 are fixedly connected to both sides of the movable cover 1 , and the movable cover 1 is locked with the fixed cover 2 by the hooks 6 .

[0037] like Figure 2 As shown, the smoke exhaust duct 4 extends into the rolling mill, and a plurality of ventilation holes are provided at the extending end of the smoke exhaust duct 4 to connect to the interior of the rolling mill. The top of the smoke exhaust damper 3 is a square flange structure, and the top of the smoke exhaust damper 3 is connected to the workshop exhaust duct by bolts.

[0038] Example 4 The cold rolling mill oil mist collection device proposed in this embodiment is as follows: Figure 1 As shown, it includes oil mist collection components symmetrically arranged on both sides of the frame, each group of oil mist collection components includes a fixed cover 2, one side of the fixed cover 2 is fixedly connected to the frame, and the other side of the fixed cover 2 is fixedly connected to a movable cover 1, a ventilation port is provided on the side of the fixed cover 2 close to the movable cover 1, a smoke exhaust damper 3 is provided at the top center of the fixed cover 2, a smoke exhaust duct 4 is fixedly connected to the top of the fixed cover 2, the smoke exhaust damper 3 and the frame are located, the smoke exhaust damper 3 and the smoke exhaust duct 4 are both provided with an air volume adjustment mechanism 5, and a drainage collection component is fixedly connected to the bottom of the fixed cover 2.

[0039] The fixed cover 2 is a frame structure, and the fixed cover 2 is welded with steel plates except for the bottom surface.

[0040] A cylindrical pin 8 and two wedges 7 are fixedly connected to the top of the fixed cover 2 , the movable cover 1 is positioned by the cylindrical pin 8 and the wedges 7 , hooks 6 are fixedly connected to both sides of the movable cover 1 , and the movable cover 1 is locked with the fixed cover 2 by the hooks 6 .

[0041] like Figure 2 As shown, the smoke exhaust duct 4 extends into the rolling mill, and a plurality of ventilation holes are provided at the extending end of the smoke exhaust duct 4 to connect to the interior of the rolling mill. The top of the smoke exhaust damper 3 is a square flange structure, and the top of the smoke exhaust damper 3 is connected to the workshop exhaust duct by bolts.

[0042] like Figure 3 As shown, the drain collection assembly includes a drain plate 9, such as Figure 4 As shown, the drain plate 9 is a herringbone structure, and the drain plate 9 is fixed in the fixed cover 2 by means of stud supports, and the fixed cover 2 and the drain plate 9 form a closed cavity, and a ventilating hole with a closed upper part and an open lower part is provided on the drain plate 9.

[0043] Both sides of the bottom of the fixed cover 2 and the movable cover 1 are fixedly connected with guide channel steels 10, and the drain plates 9 are joined to the guide channel steels 10 through studs, and the guide channel steels 10 are all arranged in a sloped direction.

[0044] Each vent on the smoke exhaust duct 4 is provided with an air volume regulating mechanism 5, and the air volume regulating mechanism 5 includes a wrench, and the wrench controls the rotation of the fan blades through the rotating shaft.

[0045] Example 5 The cold rolling mill oil mist collection method proposed in this embodiment uses any cold rolling mill oil mist collection device of the above-mentioned embodiments 1 to 4, and the steps are as follows: S1: After the water-gasoline mist is generated, each ventilating opening of the smoke exhaust duct 4 is ventilated in different areas to draw the water-gasoline mist into the smoke exhaust duct 4; S2: Manually adjust the size of the fan blades and the vents of the air volume adjustment mechanism 5 to control the wind pressure, and then adjust the size of the exhaust air volume of the vents of the corresponding smoke exhaust duct 4; S3: Adjust the extension length of the fixing studs of the drain plate 9, and then adjust the size of the air inlet of the fixed cover 2 to complete the adjustment of the exhaust air volume of the fixed cover 2.

[0046] S4: Adjust the size of the fan blades and the exhaust port of the air volume adjustment mechanism 5 of the smoke exhaust damper 3, thereby adjusting the size of the exhaust port of the fixed cover 2 to complete the exhaust air volume adjustment.

[0047] S5: The water-gasoline mist in the fixed hood 2 and the smoke exhaust duct 4 passes through the smoke exhaust damper 3, and the water-gasoline mist is sent into the workshop exhaust duct.

[0048] Example 6 The cold rolling mill oil mist collection method proposed in this embodiment uses any cold rolling mill oil mist collection device of the above-mentioned embodiments 1 to 4, and the steps are as follows: S1: After the water-gasoline mist is generated, each ventilating opening of the smoke exhaust duct 4 is ventilated in different areas to draw the water-gasoline mist into the smoke exhaust duct 4; S2: Manually adjust the size of the fan blades and the vents of the air volume adjustment mechanism 5 to control the wind pressure, and then adjust the size of the exhaust air volume of the vents of the corresponding smoke exhaust duct 4; S3: Adjust the extension length of the fixing studs of the drain plate 9, and then adjust the size of the air inlet of the fixed cover 2, so as to complete the adjustment of the exhaust air volume of the fixed cover 2; S4: adjusting the size of the fan blades and the exhaust port of the air volume adjustment mechanism 5 of the smoke exhaust damper 3, thereby adjusting the size of the exhaust port of the fixed cover 2, and completing the exhaust air volume adjustment; S5: The water-gasoline mist in the fixed hood 2 and the smoke exhaust duct 4 passes through the smoke exhaust damper 3, and the water-gasoline mist is sent into the workshop exhaust duct.

[0049] The specific steps for regional ventilation are as follows: Use the vents extending into the exhaust duct 4 inside the rolling mill to extract most of the water-gasoline mist in the frame; use the vents on the drain plate 9 to extract part of the water-gasoline mist escaping from both sides of the rolling mill; and use the vents on the left side of the fixed cover 2 to extract a small part of the water vapor reaching the movable cover 1.

[0050] 10. By disassembling and installing the movable cover 1, the equipment below the movable cover 1 is maintained, the extended length of the studs of the drain plate 9 is adjusted to adjust the height of the drain plate 9, and the sludge in the guide channel steel 10 is cleaned.

Claims

1. Cold rolling mill oil mist collection device, characterized in that: The invention comprises oil mist collection components symmetrically arranged on both sides of a frame, wherein each group of the oil mist collection components comprises a fixed cover (2), one side of the fixed cover (2) is fixedly connected to the frame, the other side of the fixed cover (2) is fixedly connected to a movable cover (1), a ventilation opening is provided on a side of the fixed cover (2) close to the movable cover (1), a smoke exhaust damper (3) is provided at the top center of the fixed cover (2), a smoke exhaust pipe (4) is fixedly connected to the top of the fixed cover (2), the smoke exhaust pipe (4) is located between the smoke exhaust damper (3) and the frame, the smoke exhaust damper (3) and the smoke exhaust pipe (4) are both provided with an air volume adjustment mechanism (5), and a drainage collection component is fixedly connected to the bottom of the fixed cover (2).

2. The cold rolling mill oil mist collection device according to claim 1, characterized in that: The fixed cover (2) is a frame structure, and the fixed cover (2) is welded with steel plates except for the bottom surface.

3. The oil mist collection device for a cold rolling mill according to claim 2, characterized in that: The top of the fixed cover (2) is fixedly connected with a cylindrical pin (8) and a wedge block (7), the movable cover (1) is positioned by the cylindrical pin (8) and the wedge block (7), hooks (6) are fixedly connected to both sides of the movable cover (1), and the movable cover (1) is locked with the fixed cover (2) by the hooks (6).

4. The cold rolling mill oil mist collection device according to claim 2, characterized in that: The smoke exhaust pipe (4) extends into the interior of the rolling mill. A plurality of ventilation holes are provided at the end of the smoke exhaust pipe (4) that is connected to the interior of the rolling mill. The top of the smoke exhaust damper (3) is a square flange structure. The top of the smoke exhaust damper (3) is connected to the workshop exhaust duct via bolts.

5. The cold rolling mill oil mist collection device according to claim 2, characterized in that: The drain collecting assembly comprises a drain plate (9), the drain plate (9) being a herringbone structure, the drain plate (9) being fixed in the fixed cover (2) by means of stud supports, the fixed cover (2) and the drain plate (9) forming a closed cavity, and a ventilating opening which is closed at the top and open at the bottom is provided on the drain plate (9).

6. The cold rolling mill oil mist collection device according to claim 5, characterized in that: Both sides of the bottom of the fixed cover (2) and the movable cover (1) are fixedly connected with guide channel steels (10), and the drain plate (9) is joined to the guide channel steels (10) by means of studs, and the guide channel steels (10) are all arranged in a sloped direction.

7. The oil mist collection device for a cold rolling mill according to claim 4, characterized in that: Each ventilation opening on the smoke exhaust duct (4) is provided with an air volume regulating mechanism (5), and the air volume regulating mechanism (5) comprises a wrench, and the wrench controls the rotation of the fan blades via a rotating shaft.

8. The method for collecting oil mist from a cold rolling mill according to claim 7, characterized in that: The specific steps include: S1: After the water-gasoline mist is generated, each ventilation opening of the smoke exhaust duct (4) performs regional exhaust, and the water-gasoline mist is drawn into the smoke exhaust duct (4); S2: manually adjusting the size of the fan blades and the vents of the air volume adjustment mechanism (5) to control the wind pressure, and then adjusting the size of the exhaust air volume of the vents of the corresponding smoke exhaust duct (4); S3: adjusting the extension length of the fixing studs of the drain plate (9), thereby adjusting the size of the air inlet of the fixed cover (2), and completing the adjustment of the exhaust air volume of the fixed cover (2); S4: adjusting the size of the fan blades and the exhaust port of the air volume adjustment mechanism (5) of the smoke exhaust damper (3), thereby adjusting the size of the exhaust port of the fixed cover (2) to complete the exhaust air volume adjustment; S5: The water-gasoline mist in the fixed hood (2) and the smoke exhaust duct (4) passes through the smoke exhaust damper (3) and is sent into the workshop exhaust duct.

9. The method for collecting oil mist from a cold rolling mill according to claim 8, characterized in that: The specific steps of the regional ventilation are as follows: Most of the water-gasoline mist in the frame is sucked out through the vents extending into the exhaust duct (4) inside the rolling mill; part of the water-gasoline mist escaping from both sides of the rolling mill is sucked out through the vents on the drain plate (9); and a small part of the water vapor reaching the movable cover (1) is sucked out through the vents on the left side of the fixed cover (2).

10. The cold rolling mill oil mist collection method according to claim 8, characterized in that: By disassembling and installing the movable cover (1), the equipment below the movable cover (1) is maintained, the extension length of the studs of the drain plate (9) is adjusted, thereby adjusting the height of the drain plate (9), and the sludge in the guide channel steel (10) is cleaned.

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