An iron oxide scale removing device for hot-rolled sheet

Abstract

The utility model belongs to hot rolling technical field especially relates to a mill scale removal device of hot rolled sheet, its characterized in be including equipment base, plate blank roller, dust hood, outer exhaust pipe, high pressure nozzle and follow -up scraper, high pressure nozzle sets up one before and after two rows along the hot rolled plate blank advancing direction, each row high pressure nozzle is symmetrically set up on the hot rolled plate blank, follow -up scraper is two rows, and the high pressure nozzle is set up in group above the plate blank, and follow -up scraper is located the rear side of this group high pressure nozzle, two rows high pressure nozzles are connected the water supply line of different pressure respectively, the outlet direction of high pressure nozzle and the hot rolled plate blank advancing direction are the same direction and form 70 75 DEG angle alpha, and the cleaning direction of follow -up scraper and the hot rolled plate blank advancing direction are the reverse direction and form 60 65 DEG angle beta, the utility model has the beneficial effects that: the combination structure of double -row high pressure nozzle and double -row follow -up scraper improves the removal effect, and the combination force of follow -up scraper and the plate blank is stable and adjustable, and the cleaning effect is good.

Description

Technical Field

[0001] This utility model belongs to the field of hot rolling technology, and in particular relates to a device for removing iron oxide scale from hot-rolled thin plates. Background Technology

[0002] Hot-rolled plate is a general term for hot-rolled steel plates and strips. The width is usually ≥600mm and the thickness ranges from 0.35-200mm (steel plate) or 1.2-25mm (steel strip). Its production process includes slab heating, rough rolling, finish rolling and laminar flow cooling. It adopts headless rolling technology (such as ESP continuous casting and rolling and Castrip thin strip casting and rolling technology) to achieve efficient and energy-saving production, and applies a new super-controlled rolling process (Super-CR) to improve the plate shape control accuracy

[12] . By high-temperature rolling (1100-1250℃), the metal grain structure is changed and internal defects are removed. The finished product form can be divided into direct coil, split coil and flat coil.

[0003] Slab descaling is a crucial step in hot rolling processes to remove iron oxide scale from the slab surface, primarily achieved through high-pressure water jetting. This process effectively exposes surface defects, improves the surface finish of the rolled material, and reduces rolling energy consumption. Compared to traditional mechanical descaling methods, high-pressure water descaling technology offers advantages such as zero metal loss and low operating costs, and has become a mainstream process in modern rolling mills. It is widely used in medium and heavy plate production lines, often operating in conjunction with equipment such as heating furnaces and flying shears to form a complete pre-rolling treatment system.

[0004] Chinese utility model patent application number 201921090496.0 discloses a descaling device for a hot-rolled steel plate production line, including a frame. A movable door is installed on the front wall of the frame, and a water tank is installed at the bottom of the frame. A water pump is installed at the bottom of the water tank, and a water outlet pipe is connected to the outlet of the water pump. A nozzle is installed at the end of the water outlet pipe furthest from the water pump. Electric telescopic rods are symmetrically installed on the upper wall of the frame, and a placement plate is fixed to the top of the electric telescopic rods. A first support column and a second support column are symmetrically fixed at both ends of the upper wall of the frame. When using brush rollers for descaling, water is sprayed onto the outer surface of the hot-rolled steel plate simultaneously with the descaling process, which can promptly wash away the oxide scale removed by the brush rollers. The problems with this solution are that the rotation of the brush rollers can trap large pieces of iron oxide scale, reducing the cleaning ability of the brush bristles, and the iron oxide scale embedded in the bristles is difficult to remove, which shortens the service life of the brush rollers. Furthermore, even with a row of nozzles, there is still a possibility that iron oxide scale will not be completely removed, and the residual iron oxide scale will affect the surface quality of the steel plate. Utility Model Content

[0005] The purpose of this invention is to provide a device for removing iron oxide scale from hot-rolled thin plates, overcoming the shortcomings of existing technologies. It adopts a combination structure of double-row high-pressure nozzles and double-row follower scrapers. The two rows of high-pressure nozzles have different pressures. The first row rapidly cools down under lower pressure, causing the iron oxide scale to separate from the slab under the action of thermal expansion and contraction. The second row completes the second cleaning under higher pressure. Each row of high-pressure nozzles is followed by a row of follower scrapers, which further improves the removal effect and leaves no residue. The scraper structure has a smooth surface, making it easy to clean.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An iron oxide scale removal device for hot-rolled thin plates includes a base, slab support rollers, a dust hood, an external exhaust duct, high-pressure nozzles, and follow-up scrapers. The high-pressure nozzles are arranged in two rows, one in front and one behind, along the traveling direction of the hot-rolled slab. Each row of high-pressure nozzles is symmetrically arranged above and below the hot-rolled slab. Two rows of follow-up scrapers are arranged in groups with the high-pressure nozzles above the slab, with the follow-up scrapers positioned behind the group of high-pressure nozzles. The two rows of high-pressure nozzles are connected to water supply pipes with different pressures. The outlet direction of the high-pressure nozzles is in the same direction as the traveling direction of the hot-rolled slab, forming an angle α of 70-75°. The cleaning direction of the follow-up scrapers is opposite to the traveling direction of the hot-rolled slab, forming an angle β of 60-65°.

[0007] Furthermore, the opening of the high-pressure nozzle is a rounded rectangle with a length L × width H of 15-20mm × 0.8-1.2mm. The inner wall of the nozzle opening has a 15° flared mouth, and the high-pressure nozzle is provided with external threads for connection to the water inlet pipe.

[0008] Furthermore, the high-pressure nozzles are evenly arranged along the water inlet pipe with a spacing of 50-60mm.

[0009] Furthermore, the follower scraper includes a scraper shaft, a scraper frame, and a scraper. A torsion spring is provided between the scraper frame and the scraper shaft, and each end of the scraper shaft is connected to the piston end of a lifting cylinder.

[0010] Furthermore, the scraper shaft is provided with multiple support sleeves, each of which is connected to the piston end of a corresponding lifting cylinder.

[0011] Furthermore, a slab support roller is provided below the follower scraper.

[0012] Furthermore, a pressure sensor is installed on the water supply pipeline, and the pressure sensor communicates with the microcomputer in the control room via RS-485.

[0013] Compared with the prior art, the beneficial effects of this utility model are: The system employs a combination of double-row high-pressure nozzles and double-row follow-up scrapers. The two rows of high-pressure nozzles operate at different pressures. The first row rapidly cools the hot-rolled slab under lower pressure, causing the iron oxide scale to separate from the slab due to thermal expansion and contraction. The second row completes the second cleaning under higher pressure. Each row of high-pressure nozzles is followed by a row of follow-up scrapers to further improve the removal effect, leaving no iron oxide scale residue. The following scraper has a stable and adjustable bonding force with the slab, which improves the scraping force on the iron oxide scale on the slab surface and has a good cleaning effect; in addition, the surface of the following scraper is smooth and easy to clean. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the high-pressure nozzle structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the follower scraper structure in an embodiment of the present utility model; In the diagram: 1-Equipment base, 2-Slab support roller, 3-Dust hood, 4-External exhaust pipe, 5-High pressure nozzle, 6-Follow-up scraper, 7-Hot-rolled slab, 8-Water inlet pipe, 9-Scraper shaft, 10-Scraper frame, 11-Scraper, 12-Torsion spring, 13-Lifting cylinder, 14-Support sleeve. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0017] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0018] See Figure 1-3This is a schematic diagram of the application state structure of a device for removing iron oxide scale from hot-rolled thin plates according to an embodiment of the present invention. It includes a base 1, slab support rollers 2, a dust hood 3, an external exhaust duct 4, high-pressure nozzles 5, and a follow-up scraper 6. The high-pressure nozzles 5 are arranged in two rows, one in front and one behind, along the traveling direction of the hot-rolled slab 7. Each row of high-pressure nozzles 5 is symmetrically arranged above and below the hot-rolled slab 7. There are two rows of follow-up scrapers 6, grouped with the high-pressure nozzles 5 above the hot-rolled slab 7, and the follow-up scrapers 6 are located behind the group of high-pressure nozzles 5. The two rows of high-pressure nozzles 5 are respectively connected to water supply pipes with different pressures. The outlet direction of the high-pressure nozzles 5 is in the same direction as the traveling direction of the hot-rolled slab 7, forming a 70-75° angle α, creating a thorough cleaning without dead angles. The cleaning direction of the follow-up scrapers 6 is opposite to the traveling direction of the hot-rolled slab 7, forming a 60-65° angle β, creating a scraping force. The dust cover 3 is placed above the high-pressure nozzle and connected to the external exhaust pipe 4 to prevent the blowing mist from polluting the working environment.

[0019] The high-pressure nozzles 5 have rounded rectangular openings, with a length L × width H of 15-20mm × 0.8-1.2mm. The nozzles that first contact the hot-rolled slab are designated as the front row nozzles. The preferred opening size of the front row nozzles is 18mm × 1.0mm, with a front water pressure of 3.5MPa. This allows for rapid cooling of the hot-rolled slab with a relatively small water volume, separating the iron oxide scale from the slab. The preferred opening size of the rear row nozzles is 16mm × 0.8mm, with a rear water pressure of 16MPa. This provides a strong impact force, quickly removing residual oxide scale while minimizing excessive cooling of the hot-rolled slab and reducing energy loss during subsequent reheating. The inner wall of the nozzle 5 opening has a 15° flared design, facilitating a larger spray area. The high-pressure nozzles 5 are threaded to connect to the water inlet pipe 8 for easy replacement. The high-pressure nozzles 5 are evenly arranged along the water inlet pipe 8 with a spacing of 50-60mm to ensure uniform purging.

[0020] The follower scraper 6 includes a scraper shaft 9, a scraper frame 10, and a scraper 11. A torsion spring 12 is provided between the scraper frame 10 and the scraper shaft 9. Each end of the scraper shaft 9 is connected to the piston end of a lifting cylinder 13. The scraper 11 has a straight cutting edge. To make the lifting operation of the follower scraper 6 more balanced, multiple support sleeves 14 are also provided on the scraper shaft 9, and each support sleeve 14 is connected to the piston end of a corresponding lifting cylinder 13. To ensure a uniform and stable contact force between the follower scraper 6 and the hot-rolled slab 7, and to reliably remove the iron oxide scale, a slab support roller 2 is provided below the follower scraper 6.

[0021] To ensure better removal results, a pressure sensor is installed on the water supply pipeline. The pressure sensor communicates with the microcomputer in the control room via RS-485, allowing the operator to monitor the water pressure in real time and thus determine the spray status.

[0022] In the embodiment of this utility model, the lifting cylinder 13 is first lifted and the hot-rolled slab 7 is introduced onto the slab support roller 2. The lifting cylinder 13 falls, and the blade of the follower scraper 6 falls onto the hot-rolled slab 7. The lifting cylinder 13 continues to fall 30-60mm, causing the torsion spring 12 to deform. The scraper 11 on the follower scraper 6 presses against the hot-rolled slab 7 with a pre-applied pressure, so that the scraper 11 has sufficient scraping force.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for removing iron oxide scale from hot-rolled thin plates, characterized in that, The equipment includes a base, slab support rollers, a dust hood, an external exhaust duct, high-pressure nozzles, and follow-up scrapers. The high-pressure nozzles are arranged in two rows, one in front and one behind, along the traveling direction of the hot-rolled slab. Each row of high-pressure nozzles is symmetrically arranged above and below the hot-rolled slab. There are two rows of follow-up scrapers, which are grouped with the high-pressure nozzles above the slab and are located behind the high-pressure nozzles above. The two rows of high-pressure nozzles are respectively connected to water supply pipelines with different pressures. The outlet direction of the high-pressure nozzles is in the same direction as the traveling direction of the hot-rolled slab and forms an angle α of 70-75°. The cleaning direction of the follow-up scrapers is opposite to the traveling direction of the hot-rolled slab and forms an angle β of 60-65°.

2. The device for removing iron oxide scale from hot-rolled thin plates according to claim 1, characterized in that, The high-pressure nozzle has a rounded rectangular opening with a length L × width H of 15-20mm × 0.8-1.2mm. The inner wall of the nozzle opening has a 15° flared mouth, and the high-pressure nozzle is provided with an external thread for connection to the water inlet pipe.

3. The iron oxide scale removal device for hot-rolled thin plates according to claim 2, characterized in that, The high-pressure nozzles are evenly arranged along the water inlet pipe with a spacing of 50-60mm.

4. The iron oxide scale removal device for hot-rolled thin plates according to claim 1, characterized in that, The follower scraper includes a scraper shaft, a scraper frame, and a scraper. A torsion spring is provided between the scraper frame and the scraper shaft. Each end of the scraper shaft is connected to the piston end of a lifting cylinder.

5. The iron oxide scale removal device for hot-rolled thin plates according to claim 4, characterized in that, The scraper shaft is provided with multiple support sleeves, and each support sleeve is connected to the piston end of a corresponding lifting cylinder.

6. The iron oxide scale removal device for hot-rolled thin plates according to claim 1, characterized in that, A slab support roller is provided below the follower scraper.

7. The iron oxide scale removal device for hot-rolled thin plates according to claim 1, characterized in that, A pressure sensor is installed on the water supply pipeline, and the pressure sensor communicates with the microcomputer in the control room via RS-485.

Images