A dust removal device for hot rolling skin-pass mill

Abstract

The present invention provides a dust removal device in a frame of a hot rolling leveler, comprising a first purge mechanism and a first suction mechanism located at the inlet side of the leveler, and a second purge mechanism and a second suction mechanism located at the outlet side of the leveler; the first purge mechanism is located between the upper and lower working rolls, and the purge direction of the first purge mechanism is toward the gap between the upper and lower working rolls; the second purge mechanism is located between the upper and lower working rolls, and between the upper working roll and the upper support roll, and the purge direction of the second purge mechanism is toward the gap between the upper and lower working rolls, and the gap between the upper working roll and the upper support roll. According to the location and mechanism of iron oxide dust generated during the rolling process, the invention arranges a purge mechanism at the gap between the upper and lower working rolls at the inlet side of the leveler and the gap between the upper working roll and the upper support roll and the lower working roll at the outlet side, and adopts a combination of blowing and suction to clean the iron oxide dust, with good dust removal effect and improved strip surface quality.

Description

Technical Field

[0001] The invention belongs to the technical field of hot rolling and leveling, and in particular relates to a dust removal device in a frame of a hot rolling and leveling machine. Background Art

[0002] Hot rolling and leveling can improve the structure of hot rolled products, effectively eliminate the yield platform of the strip, improve the plate shape and surface quality, and enhance the competitiveness of hot rolled strip products. During the leveling rolling process, the oxide on the strip surface will separate from the strip matrix and fall off, which can be confirmed by observing the black powder on the equipment in the rack. Therefore, a dust removal device is generally required at the rack of the hot rolling and leveling unit.

[0003] The existing rack dust removal device of the hot rolling skin-pass mill is generally arranged at the entrance and exit of the rack. Some units are only arranged at the exit of the rack due to investment and equipment layout. Usually, the dust suction port is arranged separately or arranged on the anti-entanglement guide plate to suck away the flying iron oxide dust. However, from the actual use effect, since the dust suction port is difficult to closely contact with the strip steel, its actual dust removal effect is not ideal. Summary of the invention

[0004] The purpose of the present invention is to provide a dust removal device in the frame of a hot rolling skin-pass mill, which adopts a blowing and suction combination method to improve the dust removal effect according to the location and mechanism of iron oxide dust generated during the rolling process.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A dust removal device for a frame of a hot rolling leveler, comprising a first purge mechanism and a first suction mechanism located at an inlet side of the leveler, and a second purge mechanism and a second suction mechanism located at an outlet side of the leveler; the first purge mechanism is located between an upper working roll and a lower working roll at the inlet side of the leveler, and a purge direction of the first purge mechanism is toward a gap between the upper working roll and the lower working roll; the second purge mechanism is located between an upper working roll and a lower working roll, and between an upper working roll and an upper supporting roll at an outlet side of the leveler, and a purge direction of the second purge mechanism is toward a gap between the upper working roll and the lower working roll, and a gap between the upper working roll and the upper supporting roll.

[0007] Furthermore, the first blowing mechanism includes two blowing beams, which are respectively arranged at the roll gaps of the upper and lower working rolls on the inlet side of the leveling machine. The blowing beams are arranged parallel to the axes of the working rolls. The blowing beams are provided with a plurality of air nozzles which are arranged in a straight line and distributed at intervals. The airflow blowing direction of each air nozzle on the blowing beam is from the middle of the corresponding working roll to both ends along the roll gap direction of the working roll.

[0008] Furthermore, the second blowing mechanism includes three blowing beams, which are respectively arranged at the roll gaps of the upper and lower working rolls and the upper supporting roll on the outlet side of the leveling machine. The blowing beams are arranged parallel to the axes of the working rolls. The blowing beams are provided with a plurality of air nozzles which are arranged in a straight line and distributed at intervals. The airflow blowing direction of each air nozzle on the blowing beam is from the middle of the corresponding roll gap to both ends along the roll gap direction.

[0009] Furthermore, the first blowing mechanism and the second blowing mechanism both cover the corresponding roller arrangement with the full width of their blowing ranges.

[0010] Furthermore, the above-mentioned dust removal device in the frame of the hot rolling leveling mill also includes an inlet dust hood and an outlet dust hood respectively arranged on the inlet side and outlet side of the leveling mill, the inlet dust hood covers the roll gap arrangement of the upper and lower working rolls, the first purge mechanism is installed inside the inlet dust hood, the inlet dust hood is provided with an inlet channel for the strip to pass through, the outlet dust hood covers the roll gap arrangement of the upper and lower working rolls and the roll gap arrangement of the upper working roll and the upper supporting roll, the second purge mechanism is installed inside the outlet dust hood, and the outlet dust hood is provided with an outlet channel for the strip to pass through.

[0011] Furthermore, the inlet dust collecting hood is provided with two connected arc guide plates on one side close to the roller surface of the working roller, and the shapes of the two arc guide plates respectively match the roller surfaces of the upper and lower working rollers, and each arc guide plate faces the corresponding roller surface and is arranged with a certain gap between the arc guide plates and the roller surface.

[0012] Furthermore, the outlet dust collecting hood is provided with three sections of arc guide plates connected in sequence from top to bottom on one side close to the roller surface, and the shapes of the three sections of the arc guide plates respectively match the roller surfaces of the upper supporting roller, the upper working roller and the lower working roller, and each section of the arc guide plates faces the corresponding roller surface and is arranged with a certain gap between the roller surface.

[0013] Furthermore, the inlet dust collecting hood and the outlet dust collecting hood are both connected with a telescopic hydraulic cylinder for driving the dust collecting hood to approach or move away from the roller surface.

[0014] Furthermore, the first suction mechanism and the second suction mechanism are connected to the inlet dust hood and the outlet dust hood respectively.

[0015] Furthermore, the first suction mechanism and the second suction mechanism both include a negative pressure suction dust removal collection pipe, and a negative pressure controller for adjusting the negative pressure intensity in the negative pressure suction dust removal collection pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The dust removal device in the frame of the hot rolling leveler provided by the present invention is arranged with a blowing mechanism at the roll gap between the upper and lower working rolls on the inlet side of the leveler and at the roll gap between the upper working roll and the upper support roll and the lower working roll on the outlet side of the leveler according to the location and mechanism of the iron oxide dust generated during the rolling process, and a combination of blowing and suction is used to clean the iron oxide dust, thereby achieving good dust removal effect and improving the surface quality of the strip.

[0018] (2) The dust removal device in the frame of the hot rolling leveling machine provided by the present invention is equipped with dust collecting hoods at the positions where iron oxide dust is easily generated on the inlet and outlet sides of the leveling machine, so that the purged dust falls into the dust collecting hood, realizing closed dust collection and further improving the dust removal effect.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a dust removal device in a frame of a hot rolling skin-pass mill according to the present invention;

[0021] Figure 2 It is a structural schematic diagram of the purge beam in the present invention.

[0022] Explanation of the accompanying drawings: 1. Upper supporting roller; 2. Upper working roller; 3. First purge mechanism; 4. Inlet dust collecting hood; 5. Telescopic hydraulic cylinder; 6. First suction mechanism; 7. Lower working roller; 8. Lower supporting roller; 9. Second suction mechanism; 10. Strip steel; 11. Outlet dust collecting hood; 12. Second purge mechanism; 13. Arc guide plate; 14. Scraper; 15. Purge beam; 16. Air nozzle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "multiple" and "several" mean two or more.

[0026] The oxide on the surface of the steel strip 10 is hard and lacks ductility compared to the matrix. During the leveling rolling process, the steel strip 10 undergoes a certain degree of deformation. The elongation of each part in the thickness direction of the steel strip 10 is slightly different, and the surface oxide will separate from the steel strip matrix and fall off. According to analysis, the dust is concentrated at the gap between the upper and lower working rolls at the entrance of the leveling mill. In addition to being gathered at the gap between the upper and lower working rolls at the exit, the dust will also be brought into the gap between the upper working roll and the upper supporting roll in the four-roller leveling mill along the direction of rotation of the roll system, and will be brought into the gap between the upper working roll and the upper intermediate roll in the six-roller leveling mill. Based on this, this embodiment provides an in-frame dust removal device for a hot rolling leveling mill. Taking a four-roller leveling mill as an example, Figure 1 As shown, it includes a first blowing mechanism 3 and a first suction mechanism 6 located at the inlet side of the leveler, and a second blowing mechanism 12 and a second suction mechanism 9 located at the outlet side of the leveler; the first blowing mechanism 3 is located between the upper working roll 2 and the lower working roll 7 at the inlet side of the leveler, and the blowing direction of the first blowing mechanism 3 is toward the gap between the upper working roll 2 and the lower working roll 7; the second blowing mechanism 12 is located between the upper working roll 2 and the lower working roll 7 and between the upper working roll 2 and the upper supporting roll 1 at the outlet side of the leveler, and the blowing direction of the second blowing mechanism 12 is toward the gap between the upper working roll 2 and the lower working roll 7 and the gap between the upper working roll 2 and the upper supporting roll 1. In this embodiment, according to the position and mechanism of the iron oxide dust generated during the rolling process, by arranging a blowing mechanism and a suction mechanism at the roll gap near the strip 10, the iron oxide dust generated near the strip 10 is cleaned by a combination of blowing and suction, thereby reducing the influence of dust on the surface quality of the strip 10.

[0027] Among them, scrapers 14 are arranged on the roller surfaces of the upper supporting roller 1 and the lower supporting roller 8. The scraper 14 blades are arranged opposite to the rotation direction of the roller system, driven by a pneumatic system, and opened regularly to clean and scrape off dirt on the roller surface to reduce the risk of roller surface contaminants being copied to each roller surface and then transferred to the surface of the strip 10 due to the long supporting roller replacement cycle.

[0028] In a specific implementation manner, the first blowing mechanism 3 includes two blowing beams 15, which are respectively arranged at the roll gap between the upper working roll 2 and the lower working roll 7 on the inlet side of the leveling machine, and are used to blow the upper and lower surfaces of the strip steel 10 on the inlet side of the leveling machine to prevent dust from falling on the strip steel 10; the second blowing mechanism 12 includes three blowing beams 15, which are respectively arranged at the roll gap between the upper working roll 2 and the lower working roll 7 on the outlet side of the leveling machine and the roll gap between the upper working roll 2 and the upper supporting roll 1. The design principle of arranging the blowing beams 15 in the roll gap between the upper and lower working rolls on the outlet side is the same as that on the inlet side. At the same time, a blowing beam 15 is arranged at the roll gap between the upper supporting roll 1 and the upper working roll 2 to prevent dust from rising. The blowing beams 15 on the inlet and outlet sides of the leveling machine are arranged parallel to the axis of the working rolls; specifically, Figure 2 As shown, the purge beam 15 is provided with a plurality of air nozzles 16 arranged in a straight line and distributed at intervals, and the air curtain overlap of each air nozzle on the purge beam 15 can be appropriately reduced, and the airflow sweeping direction of each air nozzle 16 on the purge beam 15 is from the middle of the corresponding roller gap to both ends along the roller gap direction, so that the dust can be blown down from the middle to both sides along the roller gap direction, and the dust is sucked away by the corresponding suction mechanisms on the inlet and outlet sides of the leveler. Optimally, in order to further ensure that the dust is blown away from the surface of the strip 10, the first purge mechanism 3 and the second purge mechanism 12 both cover the corresponding roller arrangement with the full width of their purge range, so that their purge range meets the maximum width of the strip; and according to the width of the strip, the purge beam 15 can be divided into the middle section and the side section, and an air inlet pipeline is set in the middle section and the two side sections respectively, and the number of air nozzles 16 of the purge beam 15 is optimized, and the air nozzles 16 do not need to be fully opened to reduce the consumption of compressed air.

[0029] An optimized implementation manner, the above-mentioned dust removal device in the frame for the hot rolling leveling mill also includes an inlet dust hood 4 and an outlet dust hood 11 respectively arranged on the inlet side and the outlet side of the leveling mill, the inlet dust hood 4 is close to the roller surface and covers the roll gap between the upper working roller 2 and the lower working roller 7, the first purge mechanism 3 is installed inside the inlet dust hood 4, and the inlet dust hood 4 is provided with an inlet channel for the strip steel 10 to pass through; the outlet dust hood 11 is also close to the roller surface, and covers the roll gap between the upper and lower working rollers and the roll gap between the upper working roller 2 and the upper supporting roller 1, the second purge mechanism 12 is installed inside the outlet dust hood 11, and the outlet dust hood 11 is provided with an outlet channel for the strip steel 10 to pass through. During normal operation, the leveler is in the leveling rolling mode, and the five purge beams 15 on the inlet and outlet sides of the leveler are turned on to blow up the dust generated during the leveling process to prevent the dust from falling on the surface of the strip steel 10. At the same time, since the upper and lower parts of the inlet dust hood 4 and the outlet dust hood 11 are closed, the blown dust is sucked away by the suction mechanism in the corresponding dust hood, realizing closed dust suction, thereby further improving the dust removal effect on the inlet and outlet sides of the leveler. Since the inlet dust hood 4 and the outlet dust hood 11 are both provided with channels for the strip steel 10 to pass through, the arrangement of the dust hood does not affect the normal production of the strip steel.

[0030] Specifically, the first suction mechanism 6 and the second suction mechanism 9 are respectively connected to the inlet dust hood 4 and the outlet dust hood 11. The first suction mechanism 6 and the second suction mechanism 9 both include a negative pressure suction dust collection pipe and a negative pressure controller for adjusting the negative pressure intensity in the negative pressure suction dust collection pipe.

[0031] Furthermore, the inlet dust collecting hood 4 is provided with two connected arc guide plates 13 on the side close to the working roll surface, and the shapes of the two arc guide plates 13 are matched with the roll surfaces of the upper and lower working rolls respectively, and each arc guide plate 13 is opposite to the corresponding roll surface and arranged with a certain gap between the roll surface; the outlet dust collecting hood 11 is provided with three connected arc guide plates 13 from top to bottom on the side close to the roll surface, and the shapes of the three arc guide plates 13 are matched with the roll surfaces of the upper supporting roll 1, the upper working roll 2 and the lower working roll 7 respectively, and each arc guide plate 13 is opposite to the corresponding roll surface and arranged with a certain gap between the roll surface. By designing an arc-shaped guide plate 13 on the inlet dust hood 4 and the outlet dust hood 11, the dust hood can be arranged closer to the roller surface, so that the dust on the roller surface can be sucked away. At the same time, the compressed air mixed with dust generated by the purge can also be introduced into the dust hood through the arc-shaped guide plate 13, and the dust is sucked away by the suction mechanism, which effectively avoids the formation of turbulence in the purge airflow field under the influence of the reflected airflow, thereby further improving the dust removal effect.

[0032] Preferably, a telescopic hydraulic cylinder 5 for driving the dust hood close to or away from the roller surface is connected to both the inlet dust hood 4 and the outlet dust hood 11. When changing the roller or overhauling, the dust hood is driven by the telescopic hydraulic cylinder 5 to return to a safe position. During normal operation, the dust hood is pushed to a position close to the roller surface to achieve a closed dust collection effect.

[0033] To sum up, the dust removal device in the frame of the hot rolling leveling mill provided by the present invention arranges a blowing mechanism at the roll gap between the upper and lower working rolls on the inlet side of the leveling mill and at the roll gap between the upper working roll and the upper supporting roll and the lower working roll on the outlet side of the leveling mill according to the location and mechanism of iron oxide dust generated during the rolling process, and adopts a combination of blowing and suction to clean the iron oxide dust, and realizes closed dust removal through the provision of a dust collecting hood, thereby improving the dust removal effect and reducing the influence of dust on the surface quality of the strip.

[0034] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A dust removal device for a hot rolling skin-pass mill, It is characterized in that It comprises a first blowing mechanism and a first suction mechanism located at the inlet side of the leveling machine, and a second blowing mechanism and a second suction mechanism located at the outlet side of the leveling machine; the first blowing mechanism is located between the upper working roll and the lower working roll at the inlet side of the leveling machine, and the blowing direction of the first blowing mechanism is toward the gap between the upper working roll and the lower working roll; the second blowing mechanism is located between the upper working roll and the lower working roll, and between the upper working roll and the upper supporting roll at the outlet side of the leveling machine, and the blowing direction of the second blowing mechanism is toward the gap between the upper working roll and the lower working roll, and the gap between the upper working roll and the upper supporting roll; The first blowing mechanism comprises two blowing beams, which are respectively arranged at the roll gaps of the upper and lower working rolls on the inlet side of the leveling machine, the blowing beams are arranged parallel to the axes of the working rolls, and a plurality of air nozzles arranged in a straight line and distributed at intervals are provided on the blowing beams, and the airflow blowing direction of each air nozzle on the blowing beams is from the middle of the corresponding working roll to both ends along the roll gap direction of the working rolls; the second blowing mechanism comprises three blowing beams, which are respectively arranged at the roll gaps of the upper and lower working rolls and the roll gap of the upper supporting roll on the outlet side of the leveling machine, the blowing beams are arranged parallel to the axes of the working rolls, and a plurality of air nozzles arranged in a straight line and distributed at intervals are provided on the blowing beams, and the airflow blowing direction of each air nozzle on the blowing beams is from the middle of the corresponding roll gap to both ends along the roll gap direction; It also includes an inlet dust hood and an outlet dust hood respectively arranged at the inlet side and the outlet side of the leveling machine, the inlet dust hood covers the roll gap arrangement of the upper and lower working rolls, the first purge mechanism is installed inside the inlet dust hood, the inlet dust hood is provided with an inlet channel for the strip to pass through, the outlet dust hood covers the roll gap arrangement of the upper and lower working rolls and the roll gap arrangement of the upper working roll and the upper supporting roll, the second purge mechanism is installed inside the outlet dust hood, and the outlet dust hood is provided with an outlet channel for the strip to pass through; The inlet dust collecting hood is provided with two connected arc guide plates on the side close to the roll surface of the working roll, and the shapes of the two arc guide plates are matched with the roll surfaces of the upper and lower working rolls respectively, and each arc guide plate is directly opposite to the corresponding roll surface and arranged with a certain gap between the roll surface; the outlet dust collecting hood is provided with three connected arc guide plates from top to bottom in sequence on the side close to the roll surface, and the shapes of the three arc guide plates are matched with the roll surfaces of the upper supporting roll, the upper working roll and the lower working roll respectively, and each arc guide plate is directly opposite to the corresponding roll surface and arranged with a certain gap between the roll surface.

2. A dust removal device for a hot rolling skin-pass mill as claimed in claim 1, It is characterized in that The first blowing mechanism and the second blowing mechanism both cover the corresponding roller arrangement with the full width of their blowing ranges.

3. A dust removal device for a hot rolling skin-pass mill as claimed in claim 1, It is characterized in that The inlet dust collecting hood and the outlet dust collecting hood are both connected with a telescopic hydraulic cylinder for driving the dust collecting hood to approach or move away from the roller surface.

4. A dust removal device for a hot rolling skin-pass mill as claimed in claim 1, It is characterized in that The first suction mechanism and the second suction mechanism are connected to the inlet dust collecting hood and the outlet dust collecting hood respectively.

5. A dust removal device for a hot rolling skin-pass mill as claimed in claim 1 or 4, It is characterized in that The first suction mechanism and the second suction mechanism both include a negative pressure suction dust removal collection pipe and a negative pressure controller for adjusting the negative pressure intensity in the negative pressure suction dust removal collection pipe.

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