Cold rolling cooling and lubricating system

Abstract

The invention provides a cold rolling cooling and lubricating system, and relates to the technical field of strip steel cold rolling. Comprising five independently-arranged cooling and lubricating circulation subsystems which correspond to the first rolling mill to the fifth rolling mill respectively. Each subsystem comprises a collecting tank used for receiving the cooling lubricating liquid sprayed out of the rolling mill of the corresponding rack; the return tank is connected with the collecting tank and is used for temporarily storing the cooling lubricating liquid and controlling the liquid level; the cleaning tank is connected with the return tank through a circulating pump and a filter, and is used for filtering the iron powder and storing the cleaned cooling lubricating liquid; the spraying beam is connected with the cleaning tank through a flow speed control valve and a circulating pump and is used for spraying cooling lubricating liquid to the surfaces of the rollers and the strip steel of the corresponding rack; and an oil supplementing inlet and a water supplementing inlet. Each independent system is provided with a respective filter, so that the cleaning efficiency is high. The cooling lubricants of the five rolling mills are independent and are not mixed, so that the cleanliness of the cooling lubricants of the rolling mills is improved one by one, and the surface reflectivity of a cold-rolled strip steel product is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of strip cold rolling, and in particular to a cold rolling cooling and lubrication system. Background Art

[0002] Cold rolling requires cooling and lubrication. 84% to 88% of the deformation work of cold-rolled strip is converted into heat, which increases the temperature of the strip and rolls, shortening roll life, damaging the roll profile, and affecting the strip's shape and dimensional accuracy. A cooling lubricant, created by mixing rolling oil and water in a specific ratio, cools and lubricates the rolls and strip, reducing friction, lowering rolling pressure and energy consumption, and preventing metal sticking to the rolls.

[0003] The cooling lubricant circulation path of the existing technology. The filtered cooling lubricant in the only clean tank is sprayed to the rolls and strip through the circulation pump. The sprayed cooling lubricant falls into the only collection tank. The cooling lubricant in the collection tank falls into the only return tank. The cooling lubricant in the return tank is pumped out by the circulation pump. The iron powder is filtered through the filter. Then it enters the only clean tank. The total liquid volume of the cooling lubricant system is generally maintained at 150-200m 3 The entire system's oil and water replenishment is completed through the cleaning tank. Existing cooling and lubrication systems have the following shortcomings: 1. The large amount of liquid retained takes a long time to change concentration, requiring over three hours to change the concentration of the entire system; 2. The concentration of the cooling and lubricating liquid sprayed on each rolling mill is uniform; 3. Due to the large amount of liquid retained, the filtration effect is difficult to achieve the ideal level, resulting in a blackened strip surface and lowering the product grade.

[0004] The real demands of cold-rolled strip production. First, cold-rolled strip generally involves dozens of different steel grades, each with significantly different deformation resistance. Increasing the cooling lubricant concentration for steel grades with high deformation resistance can reduce rolling pressure and energy consumption, minimizing strip widening. Relatively lowering the cooling lubricant concentration for steel grades with low deformation resistance can reduce strip narrowing. In actual production, steel grades change frequently, necessitating rapid adjustments to the cooling lubricant concentration. Second, existing cold-rolling equipment generally utilizes a five-stand mill. During rolling, the rolling pressures of each stand vary significantly, and the rolling force decreases sequentially from stand 1 to stand 5. This necessitates independent control of the cooling lubricant concentration for each stand. Third, due to the large liquid volume in existing systems, achieving optimal filtration results is difficult. The cooling lubricant sprayed on each stand has the same concentration and cleanliness, resulting in a darkened strip surface and lowering the product quality. This necessitates a separate circulation filtration system for each stand.

[0005] The present invention provides a cold rolling cooling and lubricating system in which the concentration of cooling and lubricating liquid sprayed by each rolling mill can be controlled separately, thereby better meeting the requirements of the rolling process. Summary of the Invention

[0006] To address the aforementioned technical issue of existing cooling technology, which results in inconsistent cooling lubricant concentrations across rolling mills, a cold rolling cooling and lubrication system is provided. This invention employs five independent cooling and lubrication circulation systems, each corresponding to a rolling mill. Each system has its own oil and water replenishment points, allowing for separate control of cooling lubricant concentrations for each mill. Each system also has its own filter, resulting in high cleaning efficiency.

[0007] The technical means adopted in the present invention are as follows:

[0008] A cold rolling cooling and lubrication system includes five independently arranged cooling and lubrication circulation subsystems, corresponding to the first to fifth rolling mills respectively; each of the subsystems includes:

[0009] A collecting tank for receiving the cooling lubricating fluid sprayed from the corresponding stand rolling mill;

[0010] a return tank connected to the collecting tank, used for temporarily storing the cooling lubricating liquid and controlling the liquid level;

[0011] a cleaning tank connected to the return tank via a circulation pump and a filter, for filtering iron powder and storing cleaned cooling lubricating fluid;

[0012] a spray beam connected to the cleaning tank via a flow rate control valve and a circulation pump, and used for spraying cooling lubricating liquid onto the surfaces of the rolls and strip of the corresponding stand;

[0013] The oil replenishment inlet and water replenishment inlet are independently set in the cleaning tank of each subsystem to adjust the concentration of the cooling lubricant separately;

[0014] Each subsystem circulates independently, and the liquid holding capacity is 20m 3 , and the cooling and lubricating fluid of adjacent racks is isolated through a space purge device to ensure independent operation of the subsystem.

[0015] Furthermore, the filters are independently configured magnetic filters and flat-bed filters, corresponding to the first to fifth rolling mills respectively.

[0016] Furthermore, the space purge device includes: a purge nozzle arranged at the outlet of the first to fourth rolling mills, used to blow the cooling and lubricating liquid on the surface of the strip into the collection tank of the corresponding subsystem and prevent the liquid from entering the collection tank of the adjacent frame; a purge nozzle arranged at the outlet of the fifth rolling mill, used to dry the surface of the strip to prevent rust.

[0017] Furthermore, the return tank has a capacity of 20m 3 The liquid level is maintained at 50%, and each subsystem transports cooling lubricant at a flow rate of 5000-6000L / min through an independent circulation pump, and the concentration adjustment time is ≤5min.

[0018] Furthermore, the spray beam includes two rows of upper and lower nozzles, which are respectively aimed at the upper and lower surfaces of the rolls and the strip, and the nozzle density of the spray beams of the first to third rolling mills is higher than that of the fourth to fifth rolling mills.

[0019] Furthermore, the cooling lubricant concentration of each subsystem is independently controlled, among which: the rolling pressure of the first to third rolling mills is increased, and the subsystem cooling lubricant concentration is set to 3% to 5%, thereby effectively reducing the rolling pressure, reducing energy consumption, and enabling the rolling mill to roll out thinner strips; the rolling pressure of the fourth to fifth rolling mills is relatively small, and the subsystem cooling lubricant concentration is set to 1% to 2%, thereby saving oil consumption of the cooling lubricant; and the concentration adjustment is achieved through real-time proportional adjustment of the oil replenishment inlet and the water replenishment inlet.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present invention is provided with five independent cooling and lubricating circulation systems, each circulation system corresponds to a rolling mill, each system has its own oil and water replenishing point, and the cooling and lubricating liquid concentration of each rolling mill can be controlled separately.

[0022] The present invention maintains a low liquid volume in each individual system, enabling rapid adjustment of the cooling and lubricating fluid concentration. The reduction in the volume of each return tank significantly speeds up the adjustment of the cooling and lubricating fluid concentration required for the production process. The cooling and lubricating fluid concentration can also be adjusted individually for each rolling mill stand based on the rolling force of each stand.

[0023] Each individual system in this invention has its own filter, resulting in high cleaning efficiency. The cooling and lubricating fluids of the five rolling mills are independent and do not mix, improving the cleanliness of the cooling and lubricating fluids in each mill with each run. This significantly improves the surface reflectivity of the cold-rolled strip products.

[0024] Rolling efficiency is the percentage ratio of the strip's thickness before rolling to its thickness after rolling, expressed as [(Hh) / H]%. The greater the reduction ratio, the longer the arc of contact between the rollers and the strip, the larger the friction area, the more iron powder generated, and the more severe the contamination of the cooling lubricant. The typical cold rolling procedure involves gradually decreasing reduction ratios, meaning the first three rolling mills generate more friction iron powder, while the last two mills produce less. By employing independent cooling and lubrication systems for each rolling mill, the cleanliness of the cooling lubricant increases from front to back, thereby improving the cleanliness and gloss of the strip exiting the mill.

[0025] The provision of a purge device between each frame in the present invention, combined with the provision of an independent collecting tank, realizes the complete separation and independence of the cooling and lubricating liquid between each frame. Since the strip first enters the first rolling mill and then enters the second to fifth rolling mills in sequence, the cooling and lubricating liquid in the collecting tank increases with each frame, significantly improving the surface cleanliness and glossiness of the strip at the rolling mill outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 This is a diagram of the cold rolling cooling and lubrication system of the present invention.

[0028] In the figure: 1. First rolling mill; 2. Second rolling mill; 3. Third rolling mill; 4. Fourth rolling mill; 5. Fifth rolling mill; 6. Cooling and lubricating liquid collecting tank of the first rolling mill; 7. Cooling and lubricating liquid collecting tank of the second rolling mill; 8. Cooling and lubricating liquid collecting tank of the third rolling mill; 9. Cooling and lubricating liquid collecting tank of the fourth rolling mill; 10. Cooling and lubricating liquid collecting tank of the fifth rolling mill; 11. Cooling and lubricating liquid return tank of the first rolling mill; 12. Cooling and lubricating liquid return tank of the second rolling mill; 13. Cooling and lubricating liquid return tank of the third rolling mill; 14. Cooling and lubricating liquid return tank of the fourth rolling mill; 15. Cooling and lubricating liquid return tank of the fifth rolling mill; 16. Cleaning tank of the fifth rolling mill; 17. Cleaning tank of the fourth rolling mill; 18. Cleaning tank of the third rolling mill; 19. Cleaning tank of the second rolling mill; 20. Cleaning tank of the first rolling mill; 21. Circulating pump of the fifth rolling mill; 22. Circulating pump for the fourth rolling mill; 23. Circulating pump for the third rolling mill; 24. Circulating pump for the second rolling mill; 25. Circulating pump for the first rolling mill; 26. Filter for the cooling and lubricating system of the fifth rolling mill; 27. Filter for the cooling and lubricating system of the fourth rolling mill; 28. Filter for the cooling and lubricating system of the third rolling mill; 29. Filter for the cooling and lubricating system of the second rolling mill; 30. Filter for the cooling and lubricating system of the first rolling mill; 31. Cooling and lubricating liquid jet circulating pump for the fifth rolling mill; 32. Cooling and lubricating liquid jet circulating pump for the fourth rolling mill; 33. Cooling and lubricating liquid jet circulating pump for the third rolling mill; 34. Cooling and lubricating liquid jet circulating pump for the second rolling mill; 35. Cooling and lubricating liquid jet circulating pump for the first rolling mill; 36. Cooling and lubricating liquid jet flow rate control valve for the fifth rolling mill; 37. Cooling and lubricating liquid jet flow rate control valve for the fourth rolling mill; 38. Cooling and lubricating liquid jet circulating pump for the third rolling mill Lubricating fluid injection flow rate control valve; 39. Cooling lubricant injection flow rate control valve for the second rolling mill; 40. Cooling lubricant injection flow rate control valve for the first rolling mill; 41. Cooling lubricant injection beam for the first rolling mill; 42. Cooling lubricant injection beam for the second rolling mill; 43. Cooling lubricant injection beam for the third rolling mill; 44. Cooling lubricant injection beam for the fourth rolling mill; 45. Cooling lubricant injection beam for the fifth rolling mill; 46. Space purge device behind the first rolling mill; 47. Space purge device behind the second rolling mill; 48. Space purge device behind the third rolling mill; 49. Space purge device behind the fourth rolling mill; 50. Space purge device behind the fifth rolling mill; 51. Strip steel; 52. Oil replenishment inlet; 53. Water replenishment inlet. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] like Figure 1 As shown, the present invention provides a cold rolling cooling and lubrication system, including five independently arranged cooling and lubrication circulation subsystems, corresponding to the first to fifth rolling mills respectively; each subsystem includes:

[0034] A collecting tank for receiving the cooling lubricating fluid sprayed from the corresponding stand rolling mill;

[0035] Return tank, connected to the collection tank, used to temporarily store cooling lubricating fluid and control the fluid level;

[0036] The cleaning tank is connected to the return tank through a circulation pump and a filter, and is used to filter iron powder and store the cleaned cooling lubricant;

[0037] The spray beam is connected to the cleaning tank through a flow rate control valve and a lubricating liquid spray circulation pump, and is used to spray cooling lubricating liquid onto the surfaces of the rolls and strip of the corresponding stand;

[0038] The oil replenishment inlet 52 and the water replenishment inlet 53 are independently provided in the cleaning tank of each subsystem and are used to adjust the concentration of the cooling lubricant respectively;

[0039] Each subsystem circulates independently, and the liquid holding capacity is 20m 3 , and the cooling and lubricating fluid of adjacent racks is isolated through a space purge device to ensure independent operation of the subsystem.

[0040] The filters are independently configured magnetic filters + flat bed filters, corresponding to the first to fifth rolling mills respectively, and the filtering accuracy is improved with each mill, so that the cooling lubricating fluid of the fifth mill subsystem is cleaner than that of the first mill.

[0041] The space purge device includes: a purge nozzle arranged at the outlet of the first to fourth rolling mills, which is used to blow the cooling and lubricating liquid on the surface of the strip into the collection tank of the corresponding subsystem and prevent the liquid from entering the collection tank of the adjacent frame; a purge nozzle arranged at the outlet of the fifth rolling mill, which is used to dry the surface of the strip to prevent rust.

[0042] The return tank volume is 20m 3 The liquid level is maintained at 50%, and each subsystem transports cooling lubricant at a flow rate of 5000-6000L / min through an independent circulation pump, and the concentration adjustment time is ≤5min.

[0043] The spray beam includes two rows of upper and lower nozzles, which are aimed at the upper and lower surfaces of the rolls and strip respectively, and the nozzle density of the spray beams of the 1st to 3rd rolling mills is higher than that of the 4th to 5th rolling mills.

[0044] The cooling lubricant concentration of each subsystem is independently controlled, among which: the rolling pressure of the first to third rolling mills is increased, and the subsystem cooling lubricant concentration is set to 3% to 5%, thereby effectively reducing the rolling pressure, reducing energy consumption, and enabling the rolling mill to roll out thinner strips; the rolling pressure of the fourth to fifth rolling mills is relatively low, and the subsystem cooling lubricant concentration is set to 1% to 2%, thereby saving oil consumption of the cooling lubricant; and the concentration adjustment is achieved through real-time proportional adjustment of the oil supply inlet and the water supply inlet.

[0045] Example 1:

[0046] like Figure 1 As shown, the present invention provides a cold rolling cooling and lubrication system, including five independent cooling and lubrication circulation systems. Each circulation system corresponds to a rolling mill, and each system has its own oil and water replenishment points. The cooling and lubricating fluid concentration of each rolling mill can be controlled separately. Each individual system has a small liquid holding volume, and the concentration of the cooling and lubricating fluid can be quickly adjusted. Each individual system has its own filter, which has high cleaning efficiency. The cooling and lubricating fluids of the five rolling mills are independent and do not mix, so that the cleanliness of the cooling and lubricating fluid of each rolling mill is improved with each rolling mill. The surface reflectivity of the cold-rolled strip steel products is significantly improved.

[0047] Specifically include:

[0048] The first rolling mill 1, strip entry end;

[0049] The second rolling mill 2;

[0050] The third rolling mill 3;

[0051] The fourth rolling mill 4;

[0052] The fifth rolling mill 5, strip steel exit end.

[0053] The first rolling mill cooling lubricant collection tank 6, volume 30m 3 , collect the cooling lubricant sprayed from the first rolling mill.

[0054] The cooling and lubricating liquid collecting tank 7 of the second rolling mill has a capacity of 30m 3 , collect the cooling lubricant sprayed from the second rolling mill.

[0055] The cooling and lubricating liquid collection tank 8 of the third rolling mill has a volume of 30m 3 , collect the cooling lubricating fluid sprayed from the third rolling mill.

[0056] The cooling and lubricating liquid collection tank 9 of the fourth rolling mill has a capacity of 30m 3 , collect the cooling lubricating fluid sprayed from the fourth rolling mill.

[0057] The fifth rolling mill cooling and lubricating liquid collection tank 10, volume 30m 3 , collect the cooling lubricant sprayed from the fifth rolling mill.

[0058] The first rolling mill cooling and lubricating liquid return tank 11 receives the cooling and lubricating liquid from the first rolling mill cooling and lubricating liquid collection tank 6, with a volume of 20m 3 , liquid level maintenance volume 50%.

[0059] The second rolling mill cooling and lubricating liquid return tank 12 receives the cooling and lubricating liquid from the second rolling mill cooling and lubricating liquid collection tank 7, with a capacity of 20m 3 , liquid level maintenance volume 50%.

[0060] The cooling and lubricating liquid return tank 13 of the third rolling mill receives the cooling and lubricating liquid from the cooling and lubricating liquid collecting tank 8 of the third rolling mill, with a capacity of 20m 3 , liquid level maintenance volume 50%.

[0061] The cooling and lubricating liquid return tank 14 of the fourth rolling mill receives the cooling and lubricating liquid from the cooling and lubricating liquid collecting tank 9 of the fourth rolling mill, with a capacity of 20m 3 , liquid level maintenance volume 50%.

[0062] The fifth rolling mill cooling and lubricating liquid return tank 15 receives the cooling and lubricating liquid from the fifth rolling mill cooling and lubricating liquid collection tank 10, with a capacity of 20m 3 , liquid level maintenance volume 50%.

[0063] Cleaning tank 16 of the fifth rolling mill, volume 20m 3, the liquid level is maintained at 50%, the cooling lubricating liquid in the cooling and lubricating liquid return tank 15 of the fifth rolling mill enters the cleaning tank 16 of the fifth rolling mill through the filter 26 of the cooling and lubricating system of the fifth rolling mill, and the cooling and lubricating liquid in the cleaning tank 16 of the fifth rolling mill is sprayed to the fifth rolling mill 5.

[0064] Cleaning tank 17 of the fourth rolling mill, volume 20m 3 , the liquid level is maintained at 50%, the cooling lubricating liquid in the cooling and lubricating liquid return tank 14 of the fourth rolling mill enters the cleaning tank 17 of the fourth rolling mill through the filter 27 of the cooling and lubricating system of the fourth rolling mill, and the cooling and lubricating liquid in the cleaning tank 17 of the fourth rolling mill is sprayed to the fourth rolling mill 4.

[0065] Cleaning tank 18 of the third rolling mill, volume 20m 3 , the liquid level is maintained at 50%, the cooling lubricating liquid in the cooling and lubricating liquid return tank 13 of the third rolling mill enters the cleaning tank 18 of the third rolling mill through the filter 28 of the cooling and lubricating system of the third rolling mill, and the cooling and lubricating liquid in the cleaning tank 18 is sprayed to the third rolling mill 3.

[0066] Cleaning tank 19 of the second rolling mill, volume 20m 3 , the liquid level is maintained at 50%, the cooling lubricating liquid in the cooling and lubricating liquid return tank 12 of the second rolling mill enters the cleaning tank 19 of the second rolling mill through the filter 29 of the cooling and lubricating system of the second rolling mill, and the cooling and lubricating liquid in the cleaning tank 19 of the second rolling mill is sprayed to the second rolling mill 2.

[0067] Cleaning tank 20 of the first rolling mill, volume 20m 3 , the liquid level is maintained at 50%, the cooling lubricating liquid in the cooling and lubricating liquid return tank 11 of the first rolling mill enters the cleaning tank 20 of the first rolling mill through the filter 30 of the cooling and lubricating system of the first rolling mill, and the cooling and lubricating liquid in the cleaning tank 20 of the first rolling mill is sprayed to the first rolling mill.

[0068] The fifth rolling mill circulation pump 21 transports the cooling lubricating liquid in the cooling and lubricating liquid return tank 15 of the fifth rolling mill to the cleaning tank 16 of the fifth rolling mill through the filter 26 of the cooling and lubricating system of the fifth rolling mill.

[0069] The fourth rolling mill circulation pump 22 transports the cooling lubricating liquid in the cooling and lubricating liquid return tank 14 of the fourth rolling mill to the cleaning tank 17 of the fourth rolling mill through the filter 27 of the cooling and lubricating system of the fourth rolling mill.

[0070] The third rolling mill circulation pump 23 transports the cooling and lubricating liquid in the cooling and lubricating liquid return tank 13 of the third rolling mill to the cleaning tank 18 of the third rolling mill through the filter 28 of the cooling and lubricating system of the third rolling mill.

[0071] The second rolling mill circulation pump 24 transports the cooling and lubricating liquid in the second rolling mill cooling and lubricating liquid return tank 12 to the cleaning tank 19 of the second rolling mill through the filter 29 of the second rolling mill cooling and lubricating system.

[0072] The first rolling mill circulation pump 25 transports the cooling lubricating liquid in the first rolling mill cooling lubricating liquid return tank 11 to the first rolling mill cleaning tank 20 through the filter 30 of the first rolling mill cooling lubricating system.

[0073] The filter 26 of the cooling and lubrication system of the fifth rolling mill filters the iron powder in the liquid.

[0074] The filter 27 of the cooling and lubrication system of the fourth rolling mill filters the iron powder in the liquid.

[0075] The filter 28 of the cooling and lubrication system of the third rolling mill filters the iron powder in the liquid.

[0076] The filter 29 of the cooling and lubricating system of the second rolling mill filters the iron powder in the liquid.

[0077] The filter 30 of the first rolling mill cooling and lubrication system filters the iron powder in the liquid.

[0078] The fifth rolling mill cooling and lubricating liquid injection circulation pump 31 has a flow rate of 5000-6000 L / min.

[0079] The fourth rolling mill cooling and lubricating liquid injection circulation pump 32 has a flow rate of 5000-6000 L / min.

[0080] The third rolling mill cooling and lubricating liquid injection circulation pump 33 has a flow rate of 5000-6000 L / min.

[0081] The second rolling mill cooling and lubricating liquid injection circulation pump 34 has a flow rate of 5000-6000 L / min.

[0082] The first rolling mill cooling and lubricating liquid injection circulation pump 35 has a flow rate of 5000-6000 L / min.

[0083] The fifth rolling mill cooling lubricant injection flow rate control valve 36 controls the injection flow rate.

[0084] The fourth rolling mill cooling lubricant injection flow rate control valve 37 controls the injection flow rate.

[0085] The third rolling mill cooling lubricating liquid injection flow rate control valve 38 controls the injection flow rate.

[0086] The second rolling mill cooling lubricating liquid injection flow rate control valve 39 controls the injection flow rate.

[0087] The first rolling mill cooling lubricating liquid injection flow rate control valve 40 controls the injection flow rate.

[0088] The first rolling mill cooling and lubricating liquid spraying beam 41 has a row of nozzles arranged above and below the strip, spraying cooling and lubricating liquid onto the upper and lower surfaces of the first rolling mill rolls and the inlet strip.

[0089] The second rolling mill cooling and lubricating liquid spraying beam 42 has a row of nozzles arranged above and below the strip, which spray cooling and lubricating liquid onto the upper and lower surfaces of the second rolling mill rolls and the inlet strip.

[0090] The third rolling mill cooling and lubricating liquid spraying beam 43 has a row of nozzles arranged above and below the strip, which spray cooling and lubricating liquid onto the upper and lower surfaces of the third rolling mill rolls and the inlet strip.

[0091] The cooling and lubricating liquid spraying beam 44 of the fourth rolling mill has a row of nozzles arranged above and below the strip, which spray cooling and lubricating liquid onto the upper and lower surfaces of the fourth rolling mill rolls and the inlet strip.

[0092] The fifth rolling mill cooling and lubricating liquid spraying beam 45 has a row of nozzles arranged above and below the strip, spraying cooling and lubricating liquid onto the upper and lower surfaces of the fifth rolling mill rolls and the inlet strip.

[0093] The space blowing device 46 behind the first rolling mill has a row of nozzles arranged above and below the strip, which blows the upper and lower surfaces of the strip at the outlet of the first rolling mill to ensure that the liquid enters the collection tank 6 of this rolling mill and prevents the liquid from entering the collection tank 7.

[0094] The space blowing device 47 behind the second rolling mill has a row of nozzles arranged above and below the strip, which blows the upper and lower surfaces of the strip at the outlet of the second rolling mill to ensure that the liquid enters the collection tank 7 of the rolling mill and prevents the liquid from entering the collection tank 8.

[0095] The space blowing device 48 behind the third rolling mill has a row of nozzles arranged above and below the strip, which blows the upper and lower surfaces of the strip at the outlet of the third rolling mill to ensure that the liquid enters the collection tank 8 of the rolling mill and prevents the liquid from entering the collection tank 9.

[0096] The space blowing device 49 behind the fourth rolling mill has a row of nozzles arranged above and below the strip, which blows the upper and lower surfaces of the strip at the exit of the fourth rolling mill to ensure that the liquid enters the collection tank 9 of this rolling mill and prevents the liquid from entering the collection tank 10.

[0097] The space blowing device 50 behind the fifth rolling mill has a row of nozzles arranged above and below the strip, which blows the upper and lower surfaces of the strip at the exit of the fifth rolling mill to ensure that the surface of the strip is dry after rolling and prevent rust.

[0098] Strip steel 51, during the production process, the front and rear two rolls of strip steel are quickly welded to maintain continuous rolling.

[0099] The oil replenishment inlet 52 of each cleaning tank.

[0100] The water supply inlet 53 of each cleaning tank.

[0101] Circulation path of each rolling mill:

[0102] The cooling and lubrication circulation path of the first rolling mill 1 is: collecting tank 6 - return tank 11 - circulation pump 25 - filter 30 - cleaning tank 20 - circulation pump 35 - control valve 40 - injection beam 41 - collecting tank 6.

[0103] The cooling and lubrication circulation path of the second rolling mill 2 is: collecting tank 7 - return tank 12 - circulation pump 24 - filter 29 - cleaning tank 19 - circulation pump 34 - control valve 39 - injection beam 42 - collecting tank 7.

[0104] The cooling and lubrication circulation path of the third rolling mill 3 is: collecting tank 8 - return tank 13 - circulation pump 23 - filter 28 - cleaning tank 18 - circulation pump 33 - control valve 38 - injection beam 43 - collecting tank 8 .

[0105] The cooling and lubrication circulation path of the fourth rolling mill 4 is: collecting tank 9 - return tank 14 - circulation pump 22 - filter 27 - cleaning tank 17 - circulation pump 32 - control valve 37 - injection beam 44 - collecting tank 9.

[0106] The cooling and lubrication circulation path of the fifth rolling mill 5 is: collecting tank 10 - return tank 15 - circulation pump 21 - filter 26 - cleaning tank 16 - circulation pump 31 - control valve 36 - injection beam 45 - collecting tank 10 .

[0107] In the prior art, the cooling and lubrication systems for each rolling mill stand share a common system, consisting of a collection tank, a return tank, a cleaning tank, and a set of filters. The concentration of the cooling and lubricating fluid injected into each mill stand is the same, and individual control of each stand is not possible. This application divides each stand into five separate systems, allowing each system to be individually replenished with oil or water to adjust the concentration as needed.

[0108] The existing technology uses a common cooling and lubrication system for each rolling mill, and the liquid retention capacity is 150 to 200m 3 , it takes more than 3 hours to adjust the concentration. This application is divided into five independent systems, with a small liquid retention volume, and each system has a liquid retention volume of 20m 3 , calculated based on a flow rate of 5000L / min, it only takes about 5 minutes to adjust the concentration.

[0109] In the prior art, each stand shares a common filter system, resulting in uniform cleanliness of the sprayed cooling lubricant, and low reflectivity on the strip surface after rolling. This application utilizes air purge devices after each rolling mill, enabling the cooling and lubrication systems of each rolling mill to circulate completely independently. During the rolling process, the rolling force decreases with each stand, the hardening of the strip increases with each stand, and the amount of iron powder generated on the strip surface due to friction between the rollers and the strip decreases with each stand. Consequently, the cleanliness of the cooling and lubricant in the circulation system increases with each stand from the first to the fifth, raising the surface reflectivity of the strip from 82% to 95% after rolling.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold rolling cooling and lubrication system, characterized in that: It includes five independently set cooling and lubrication circulation subsystems, corresponding to the first to fifth rolling mills respectively; each of the subsystems includes: A collecting tank for receiving the cooling lubricating fluid sprayed from the corresponding stand rolling mill; a return tank connected to the collecting tank, used for temporarily storing the cooling lubricating liquid and controlling the liquid level; a cleaning tank connected to the return tank via a circulation pump and a filter, for filtering iron powder and storing cleaned cooling lubricating fluid; a spray beam connected to the cleaning tank via a flow rate control valve and a lubricating liquid spray circulation pump, for spraying cooling lubricating liquid onto the surfaces of the rolls and strip of the corresponding stand; The oil replenishment inlet and water replenishment inlet are independently set in the cleaning tank of each subsystem to adjust the concentration of the cooling lubricant separately; Each subsystem circulates independently, and the liquid holding capacity is 20m 3 , and the cooling and lubricating fluid of adjacent racks is isolated through a space purge device to ensure independent operation of the subsystem.

2. The cold rolling cooling and lubrication system according to claim 1, characterized in that: The filters are independently configured magnetic filters and flat bed filters, corresponding to the first to fifth rolling mills respectively.

3. The cold rolling cooling and lubrication system according to claim 1, characterized in that: The space purge device includes: a purge nozzle arranged at the outlet of the first to fourth rolling mills, used to blow the cooling and lubricating liquid on the surface of the strip into the collection tank of the corresponding subsystem and prevent the liquid from entering the collection tank of the adjacent frame; a purge nozzle arranged at the outlet of the fifth rolling mill, used to dry the surface of the strip to prevent rust.

4. The cold rolling cooling and lubrication system according to claim 1, characterized in that: The return tank volume is 20m 3 The liquid level is maintained at 50%, and each subsystem transports cooling lubricant at a flow rate of 5000-6000L / min through an independent circulation pump, and the concentration adjustment time is ≤5min.

5. The cold rolling cooling and lubrication system according to claim 1, characterized in that: The spray beam includes two rows of upper and lower nozzles, which are respectively aimed at the upper and lower surfaces of the rolls and the strip, and the nozzle density of the spray beams of the first to third rolling mills is higher than that of the fourth to fifth rolling mills.

6. The cold rolling cooling and lubrication system according to claim 1, characterized in that: The cooling lubricant concentration of each subsystem is independently controlled, among which: the rolling pressure of the first to third rolling mills is increased, and the subsystem cooling lubricant concentration is set to 3% to 5%, thereby effectively reducing the rolling pressure, reducing energy consumption, and enabling the rolling mill to roll out thinner strips; the rolling pressure of the fourth to fifth rolling mills is relatively low, and the subsystem cooling lubricant concentration is set to 1% to 2%, thereby saving oil consumption of the cooling lubricant; and the concentration adjustment is achieved through real-time proportional adjustment of the oil supply inlet and the water supply inlet.

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