Rolling mill capable of reducing oil spots on surface of rolled product

Abstract

The utility model discloses a rolling mill capable of reducing oil spots on the surface of a rolled product, and relates to the technical field of rolling mills. The oil-gas lubricating system comprises an oil-gas lubricating disc and a high-level oil tank which are connected with each other, the oil-gas lubricating disc is connected with a compressed air generating device, and compressed air drives lubricating oil to the working rollers; the oil gas discharging system comprises an oil gas collecting cover, a smoke discharging pipeline and a smoke discharging fan, the oil gas collecting cover covers the working roller and is connected to the smoke discharging pipeline, and the other end of the smoke discharging pipeline is connected to the smoke discharging fan. By improving the structure, oil spots of rolled products are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling mills, in particular to a rolling mill capable of reducing oil spots on the surface of rolled products. Background Art

[0002] Aluminum sheet and strip cold rolling mills are used to further process hot-rolled aluminum sheets to the desired thickness and surface finish. A four-roll irreversible roughing mill (also known as a universal mill) is a common type of cold rolling equipment. It consists of two work rolls and two backup rolls. During operation, the aluminum strip passes between the two work rolls. Because it is "irreversible," the strip can only pass in one direction, requiring re-rolling after each pass to achieve the final thickness. Oil stains are a common problem during the cold rolling process, typically caused by the following: improper configuration of the hydraulic system, oil mist lubrication system, rolling oil cooling circulation system, mill exhaust system, and rolling oil; oil leakage, bubbling, dripping, and leaking in the hydraulic system; leaks in the lubrication system of the mill's roller bearings and guide roller bearings; the semi-open lubrication system for the mill's roller bearings, which is prone to oil splashing; excessive bends in the mill's exhaust system, significantly affecting exhaust efficiency and leading to oil fume accumulation; and improper operation of the rolling oil cooling circulation system's filtration. There is an urgent need for a rolling mill system that can reduce surface oil spots. Utility Model Content

[0003] Technical problems to be solved by utility models

[0004] Aiming at the technical problem that rolled products of existing cold rolling equipment are prone to oil spots, the utility model provides a rolling mill for reducing oil spots on the surface of rolled products. The utility model reduces the oil spots on rolled products by improving the structure.

[0005] Technical Solution

[0006] In order to solve the above problems, the technical solution provided by the present invention is as follows:

[0007] A rolling mill for reducing oil spots on the surface of rolled products, comprising a rolling system including working rolls; an oil-gas lubrication system including an oil-gas lubrication plate and a high-level oil tank connected to each other, the oil-gas lubrication plate being connected to a compressed air generating device, and the compressed air drives lubricating oil to the working rolls; an oil-gas exhaust system including an oil-gas collection hood, a smoke exhaust pipe and a smoke exhaust fan, the oil-gas collection hood covering the working rolls and connected to the smoke exhaust pipe, the other end of the smoke exhaust pipe being connected to the smoke exhaust fan.

[0008] The switch from traditional oil mist lubrication to oil-air lubrication is a closed-loop lubrication system that can be recycled. The system's excellent airtightness significantly minimizes oil leakage, thereby reducing the formation of oil spots on the product. Compressed air also helps remove impurities from the work rolls, preventing the formation of oil spots. An oil-air collection hood is installed around the work rolls to collect the oil-air mixture generated during the lubrication and rolling processes, preventing it from dispersing into the environment. An exhaust duct connects the oil-air collection hood and the exhaust fan, directing the collected oil-air mixture to a treatment system. The exhaust fan provides power to draw the oil-air mixture from the purification hood to treatment equipment for purification, typically using filtration, adsorption, or chemical reactions to remove oil mist and harmful gases. By improving lubrication efficiency and strengthening oil-air emission treatment, the formation of oil spots during the rolling process is reduced, improving product surface quality and the safety of the production environment.

[0009] Optionally, the working roll is provided with a support roll in contact with the working roll, and the support roll is provided with a roller-type roller cleaner in close contact with the support roll. The roller cleaner rotates parallel to and in the opposite direction to the support roll.

[0010] Traditional roller cleaners are strips that press against the rolls only to address circumferential oil carryover. Over time, the roller cleaners become unable to move laterally, forming oil rings around the rolls. Grooves form on the edges of the roller cleaner blades where they scrape oil, resulting in poor cleaning and oil carryover to the sheet metal surface. Roller-type roller cleaners have no edges or grooves on their surfaces, mitigating the problem of oil carryover to the sheet metal surface. Furthermore, the roller cleaners rotate in opposite directions to the backup rolls, generating a shear force at the contact point that effectively scrapes away impurities adhering to the work rolls, effectively reducing oil spots and impurities on the work roll surfaces.

[0011] As an option, the roller cleaner is driven by a pneumatic motor.

[0012] No risk of electric sparks: Pneumatic motors are safer than electric motors in flammable and explosive environments because they do not produce electric sparks.

[0013] Adjustable speed: By adjusting the air supply pressure and flow, the speed of the air motor can be easily adjusted, which is very important for controlling the cleaning effect of the roller cleaner.

[0014] High torque density: Pneumatic motors can provide high torque in a small volume, suitable for compact space layout.

[0015] Simple maintenance: Compared with electric motors, pneumatic motors have a simpler structure and lower maintenance costs.

[0016] Optionally, the pressure between the roller cleaner and the support roller is 0.2-0.3 MPa.

[0017] The contact pressure between the roller cleaner and the backup roller needs to be certain to ensure that the roller cleaner can effectively clean the surface of the working roller, but it should not be too large to avoid damaging the working roller or the roller cleaner itself.

[0018] Optionally, the length of the roller cleaner is greater than or equal to the length of the support roller.

[0019] Comprehensive cleaning: The roller cleaner covers the entire width of the support roller, avoiding uncleaned areas and ensuring uniform cleaning results.

[0020] Improved efficiency: Since the roller cleaner can clean the entire surface of the support roller in one go, without having to repeat the operation multiple times, it can improve the efficiency of the cleaning process and reduce downtime.

[0021] Reduced wear: If the roller cleaner is not long enough to cover the entire width of the support roller, it may cause local over-cleaning and increase wear in that area. When the roller cleaner is long enough, the cleaning force can be evenly distributed, reducing unnecessary wear.

[0022] Extend equipment life: By effectively removing impurities on the support rollers, these impurities can be prevented from damaging the support rollers and other related components, thereby extending the overall service life of the equipment.

[0023] Quality Control: Keeping the surface of the support roller clean helps maintain product consistency and avoids quality problems caused by surface defects.

[0024] Optionally, the roller cleaner is arranged on the side of the support roller.

[0025] Avoid the oil from the roller cleaner from dripping back or adhering to the support roller due to gravity.

[0026] Optionally, an oil and gas purification box is connected between the exhaust fan and the exhaust pipe, and the oil and gas purification box is provided with a condensation filtering structure.

[0027] Cooling and condensing: The oil-gas mixture is first introduced into the condensing section, where the temperature is lowered, causing the oil vapor to condense into liquid oil droplets. This process is usually achieved by exchanging heat with a refrigerant, which can be cold water or other cooling media.

[0028] Filtration and separation: The condensed oil-gas mixture enters the filtration section, which is typically equipped with multiple layers of filter media. These media can be fiber filters, cyclones, or electrostatic oil collectors, capturing and separating oil droplets while allowing clean air to pass through.

[0029] Oil droplet collection: The separated oil droplets will be collected in the oil collection tank at the bottom of the purification box, and regularly cleaned and recycled to avoid waste and reduce environmental pollution. The condensation filter structure converts the smoke into liquid for recycling and continued use.

[0030] Optionally, the oil and gas collecting hood fully covers the top of the working roll.

[0031] Full coverage: Since the collection cover completely covers the top of the working roll, it can effectively prevent the oil and gas from spreading to other areas of the workshop, thereby reducing pollution to the environment and potential harm to workers' health.

[0032] Efficient collection: The design of the full-face hood ensures that the oil mist and gas evaporated or splashed from the working roll are directly guided into the collection hood, and then transmitted to the oil and gas purification box for treatment through the exhaust pipe and exhaust fan.

[0033] Beneficial effects

[0034] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0035] The technical solution provided by the utility model adopts an oil-gas lubrication system, including an oil-gas lubrication plate and a high-level oil tank connected to each other. The oil-gas lubrication plate is connected to a compressed air generating device, and the compressed air drives the lubricating oil to the working roll, changing from traditional oil mist lubrication to oil-gas lubrication. The oil-gas lubrication is a closed-loop lubrication system that can be recycled. The system has good airtightness and can greatly reduce oil leakage, thereby reducing the formation of oil spots on the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic structural diagram of a rolling mill for reducing oil spots on the surface of rolled products proposed in an embodiment of the present utility model;

[0037] Figure 2 A schematic structural diagram of a rolling system of a rolling mill for reducing oil spots on the surface of rolled products proposed in an embodiment of the present utility model;

[0038] 1. Main motor; 2. Main reducer; 3. Oil and gas lubrication plate; 4. Pneumatic control panel; 5. High-level oil tank; 6. Disc shear; 7. Oil and gas collection hood; 8. Smoke exhaust fan; 9. Chimney; 10. Smoke exhaust duct; 11. Oil and gas purification box; 12. Unwinder; 13. Lower working roll; 14. Lower support roll; 15. Lower roll cleaner; 16. Coiler; 17. Upper working roll; 18. Upper support roll; 19. Upper roll cleaner. DETAILED DESCRIPTION

[0039] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0040] Example

[0041] Combined with attachment Figure 1A rolling mill for reducing oil spots on the surface of rolled products includes a rolling system, including working rolls; an oil-gas lubrication system, including an oil-gas lubrication plate 3 and a high-level oil tank 5 connected to each other, the oil-gas lubrication plate 3 is connected to a compressed air generating device, and the compressed air drives the lubricating oil to the working rolls; an oil-gas exhaust system, including an oil-gas collection cover 7, a smoke exhaust pipe 10 and a smoke exhaust fan 8, the oil-gas collection cover 7 covers the working rolls and is connected to the smoke exhaust pipe 10, and the other end of the smoke exhaust pipe 10 is connected to the smoke exhaust fan 8.

[0042] The rolling mill drives the working rolls to rotate through the main motor 1 and the main reducer 2. The high-position oil tank 5 stores lubricating oil. Because it is located at a high position, the lubricating oil can be fed into the system by gravity.

[0043] The oil-air lubrication tray 3 connects to the elevated oil tank 5 and the compressed air generator, where the lubricating oil is atomized or mixed with compressed air. The compressed air generator provides compressed air, which mixes with the lubricating oil to form an oil-air mixture, achieving more uniform lubrication. Compressed air also helps remove impurities from the work rolls and prevents the formation of oil stains. In the oil-air exhaust system, an oil-air purification hood is installed around the work rolls to collect the oil-air mixture generated during the lubrication and rolling processes, preventing it from dispersing into the environment. An exhaust duct 10 connects the oil-air purification hood to the exhaust fan 8, directing the collected oil-air mixture to a treatment system. The exhaust fan 8 provides power to draw the oil-air mixture from the purification hood to a treatment facility for purification, typically using filtration, adsorption, or chemical reaction methods to remove oil mist and harmful gases. Circular shears 6 are located on both sides of the work roll outlet and are used to cut the sides of the rolled product (aluminum sheet and strip). The pneumatic control tray 4 is connected to and powered by a roller-type roller cleaner.

[0044] When the lubrication system of the rolling mill's roll bearings and guide roller bearings was changed to oil-gas lubrication, the contact between the lubricating oil and the rolling oil was reduced, avoiding the increase in the viscosity of the rolling oil; the medium of the low-pressure hydraulic system was changed to rolling oil base oil, reducing the proportion of hydraulic system leakage; the improvement of the roller cleaner eliminated the risk of the rolls bringing oil to the plate surface; the improvement of the smoke exhaust system made the space above the plate surface in the rolling mill clean and clear, and no foreign matter fell onto the plate surface, and the basic environment affecting the use of rolling oil was fully improved.

[0045] Oil mist lubrication uses the energy of compressed air to atomize liquid lubricant into tiny particles, forming an oil mist. These oil mist particles are then transported to the lubrication point under the pressure of the compressed air. In contrast, oil-air lubrication uses compressed air flow to transport fine oil droplets along the pipeline to the lubrication point without breaking the oil into a mist, maintaining the oil droplets in a droplet state. Application effectiveness and environmental impact: Oil mist lubrication makes it difficult to measure the amount of oil delivered, while oil-air lubrication allows for timed and quantitative lubrication, providing better lubrication and conserving lubricant. Furthermore, oil-air lubrication uses large amounts of compressed air to cool the bearings, resulting in significantly lower bearing temperature rise than with oil mist lubrication, thereby reducing equipment failure rates and extending service life. From an environmental perspective, during the atomization process of oil mist lubrication, some lubricant may enter the ambient air through exhaust, becoming inhalable oil mist, potentially posing a health and environmental hazard. In contrast, the lubricant in oil-air lubrication does not atomize or truly mix with the air, thus minimizing environmental pollution.

[0046] An oil and gas purification box 11 is connected between the exhaust fan 8 and the exhaust pipe 10. The oil and gas purification box 11 is provided with a condensation and filtration structure. Cooling and condensation: The oil and gas mixture is first introduced into the condensation part, where the temperature is lowered, causing the oil vapor to condense into liquid oil droplets. This process is usually achieved by exchanging heat with a refrigerant, which can be cold water or other cooling media. Filtration and separation: The condensed oil and gas mixture enters the filtration part, which is usually provided with multiple layers of filter media. The filter media can be a fiber filter, a cyclone separator or an electrostatic oil collector, etc., which is used to capture and separate oil droplets while allowing clean air to pass through. Oil droplet collection: The separated oil droplets will be collected in the oil collection tank at the bottom of the purification box and regularly cleaned and recycled to avoid waste and reduce environmental pollution. Waste gas emission: The purified air, that is, the waste gas from which most of the oil mist has been removed, will be sucked away by the exhaust fan 8 and discharged into the atmosphere through the exhaust pipe 10. At this time, the waste gas should have met the emission standards.

[0047] The oil and gas collecting hood 7 fully covers the top of the working roll, and fully covers the top of the working roll to maximize the capture and collection of the oil and gas mixture generated during the rolling process.

[0048] A large amount of oil fume passes through the oil fume collection hood 7. The collected fume is then passed through the exhaust pipe 10 into the oil fume purification box 11. The fume is converted into liquid through condensation filtration and recycling for further use. The key links in exhaust fume recovery are the pipe seal and the exhaust fan 8. Regular inspection of the fume pipe seal and the belt and pulley of the exhaust fan 8 are very important links. The exhaust fan 8 is connected to the chimney 9.

[0049] Combined with attachment Figure 2The working roll is provided with a support roll in contact with the support roll, and the support roll is provided with a roller-type roller cleaner in close contact with the support roll. The roller cleaner is parallel to the support roll and rotates in the opposite direction.

[0050] The traditional roller cleaner is two polyurethane strips pressed on the supporting roller. When the roller rotates, the oil on the roller surface is scraped off and blocked to one side to prevent the rotation from splashing onto the mill outlet plate surface, so that the mill plate surface blowing system can work normally, which can reduce the problem of oil on the plate surface. However, since the traditional roller cleaner can only be pressed on the roller to solve the oil on the roller in the circumferential direction, the roller cleaner cannot move laterally over time, and an oil ring is formed in the circumferential direction. Grooves are formed on the edges of the roller cleaner's roller blades that scrape oil, resulting in unclean roller cleaning and oil on the plate surface. If the roller cleaning blades are changed to roller-type roller cleaners, when the supporting roller rotates, the roller-type roller cleaner rotates in the opposite direction to wipe off the oil on the roller surface to prevent splashing onto the plate surface.

[0051] The working rolls are divided into an upper working roll 17 and a lower working roll 13, which are bonded together. The rolled product (aluminum strip) passes between the upper working roll 17 and the lower working roll 13, and the rolled product (aluminum strip) starts from the uncoiler 12 and is coiled on the reel 16. An upper support roll 18 is bonded above the upper working roll 17, and a lower support roll 14 is bonded below the lower working roll 13. An upper roller cleaner 19 is installed next to the upper support roll 18, and a lower roller cleaner 15 is installed next to the lower support roll 14.

[0052] The roller cleaner is driven by a pneumatic motor. Compressed air is delivered from the air source through a pipeline to the motor, rotating the internal blades or piston, which in turn drives the roller cleaner. The pneumatic system can be controlled by solenoid valves, manual valves, or proportional valves to meet different process requirements.

[0053] The pressure between the cleaning roller and the support roller is 0.2-0.3 MPa. In this embodiment, the pressure between the cleaning roller and the support roller is 0.2 MPa, 0.25 MPa or 0.3 MPa.

[0054] The roller cleaner is equal to or longer than the support roller. It covers the entire width of the support roller, eliminating any unwashed areas and ensuring a uniform cleaning effect. Because the roller cleaner cleans the entire surface of the support roller in one pass, eliminating the need for multiple repetitions, it improves cleaning efficiency and reduces downtime.

[0055] The roller cleaner is installed on the side of the backup roll. The side-mounted roller cleaner does not interfere with the direct contact and pressure distribution between the work roll and the backup roll, which means that during the cleaning process, the impact on the rolling process is minimized, helping to maintain material stability and rolling quality.

[0056] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A rolling mill for reducing oil spots on the surface of rolled products, characterized in that: include rolling system, including work rolls; The oil-gas lubrication system includes an oil-gas lubrication plate and a high-level oil tank connected to each other. The oil-gas lubrication plate is connected to a compressed air generating device, and the compressed air drives the lubricating oil to the working rolls; The oil and gas exhaust system includes an oil and gas collection hood, a smoke exhaust pipe and a smoke exhaust fan. The oil and gas collection hood covers the working roller and is connected to the smoke exhaust pipe. The other end of the smoke exhaust pipe is connected to the smoke exhaust fan.

2. A rolling mill for reducing oil spots on the surface of rolled products according to claim 1, characterized in that: The working roll is provided with a support roll in contact with the working roll, and the support roll is provided with a roller-type roller cleaner in close contact with the support roll. The roller cleaner rotates parallel to the support roll and in the opposite direction.

3. A rolling mill for reducing oil spots on the surface of rolled products according to claim 2, characterized in that: The roller cleaner is driven by a pneumatic motor.

4. A rolling mill for reducing oil spots on the surface of rolled products according to claim 3, characterized in that: The pressure between the roller cleaner and the support roller is 0.2-0.3 MPa.

5. A rolling mill for reducing oil spots on the surface of rolled products according to claim 2, characterized in that: The length of the roller cleaner is greater than or equal to the length of the support roller.

6. A rolling mill for reducing oil spots on the surface of rolled products according to claim 2, characterized in that: The roller cleaner is arranged on the side of the support roller.

7. A rolling mill for reducing oil spots on the surface of rolled products according to claim 1, characterized in that: An oil and gas purification box is connected between the smoke exhaust fan and the smoke exhaust pipe, and the oil and gas purification box is provided with a condensation filtering structure.

8. A rolling mill for reducing oil spots on the surface of rolled products according to claim 1, characterized in that: The oil and gas collecting cover fully covers the top of the working roll.

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