Cold rolling cooling and lubricating system

Abstract

The utility model 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] This utility model relates to the field of cold rolling technology of strip steel, and in particular to a cold rolling cooling and lubrication system. Background Technology

[0002] Cold rolling requires cooling and lubrication. 84%–88% of the deformation work of cold-rolled strip is converted into heat, raising the temperature of the strip and rolls, reducing roll life, damaging normal roll profiles, and affecting strip shape and dimensional accuracy. Mixing rolling oil and water in a specific ratio to create a cooling and lubricating fluid for cooling and lubricating the rolls and strip reduces friction, lowers rolling pressure and energy consumption, and prevents metal from sticking to the rolls.

[0003] The existing cooling lubricant circulation path is as follows: Filtered cooling lubricant in a single clean tank → sprayed onto the rolls and strip by a circulation pump → sprayed cooling lubricant falls into a single collection tank → cooling lubricant in the collection tank falls into a single return tank → cooling lubricant in the return tank is drawn out by the circulation pump → filtered for iron powder → enters the single clean tank. The total fluid volume of the cooling lubrication system is generally maintained at 150–200 m³. 3 The entire system's oil and water replenishment is completed through a cleaning tank. Existing cooling and lubrication systems have the following shortcomings: 1. Large liquid volume and long concentration change time; the entire system requires more than 3 hours to change concentration. 2. Inconsistent concentration of cooling and lubricating fluid sprayed from each rolling mill stand. 3. Due to the large liquid volume, the filtration effect is difficult to achieve ideal levels, resulting in blackening of the strip surface and a reduction in product grade.

[0004] The practical needs of cold-rolled strip steel production: 1. Cold-rolled strip steel production typically involves dozens of steel grades, each with significantly different deformation resistance. For grades with high deformation resistance, increasing the concentration of the cooling lubricant can reduce rolling pressure and energy consumption, thus reducing strip width. Conversely, for grades with low deformation resistance, relatively decreasing the cooling lubricant concentration can reduce strip narrowing. In actual production, the steel grades change frequently, requiring rapid adjustments to the cooling lubricant concentration. 2. Existing cold rolling mills generally employ 5-stand mills, with significant differences in rolling pressure between stands. The rolling force decreases sequentially from stand 1 to stand 5. This necessitates separate control of the cooling lubricant concentration for each stand. 3. Due to the large liquid volume in existing systems, achieving ideal filtration is difficult. The uniform concentration and cleanliness of the cooling lubricant sprayed from each stand lead to strip surface blackening, lowering product grade. This necessitates configuring separate circulating filtration systems for each stand.

[0005] This application provides a cold rolling cooling and lubrication system in which the concentration of the cooling and lubricating fluid sprayed on each stand of the rolling mill can be controlled separately, thereby better meeting the needs of the rolling process. Utility Model Content

[0006] This invention provides a cold rolling cooling and lubrication system that solves the technical problem of inconsistent concentration of cooling and lubricating fluid sprayed from each stand of the existing cooling technology.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A cold rolling cooling and lubrication system includes five independently configured cooling and lubrication circulation subsystems, corresponding to the first to fifth rolling mill stands respectively; each subsystem includes:

[0009] The collection tank is used to receive the cooling and lubricating fluid sprayed out by the corresponding stand of the rolling mill;

[0010] The return tank, connected to the collection tank, is used to temporarily store the cooling lubricant and control the liquid level;

[0011] A cleaning tank, connected to the return tank via a circulation pump and a filter, is used to filter iron powder and store the cleaned cooling lubricant;

[0012] The spray beam, connected to the cleaning tank via a flow control valve and a circulation pump, is used to spray cooling and lubricating fluid onto the rolls and strip surfaces of the corresponding stand.

[0013] The oil and water inlets are independently located in the cleaning tanks of each subsystem, and are used to adjust the concentration of the coolant and lubricant separately.

[0014] Each subsystem operates independently with a liquid holding capacity of 20m³. 3 Furthermore, the cooling and lubricating fluid of adjacent racks is isolated by a space purging device to ensure that the subsystem operates independently.

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

[0016] Furthermore, the space purging device includes: purging nozzles disposed at the outlets of the first to fourth mill stands, used to blow the cooling lubricant on the strip surface into the collection tank of the corresponding subsystem and to prevent the liquid from entering the collection tank of the adjacent stand; and purging nozzles disposed at the outlet of the fifth mill stand, used to dry the strip surface to prevent corrosion.

[0017] Furthermore, the return tank has a volume of 20m³. 3 The liquid level is maintained at 50%, and each subsystem delivers cooling and lubricating fluid at a flow rate of 5000-6000 L / min via an independent circulation pump, with a concentration adjustment time of ≤5 min.

[0018] Furthermore, the spray beam includes two rows of nozzles, one above the other, which are respectively aligned with the upper and lower surfaces of the roll and the strip, and the nozzle density of the spray beam of the first to third rolling mills is higher than that of the fourth to fifth rolling mills.

[0019] Furthermore, the concentration of the cooling and lubricating fluid in each subsystem is controlled independently. Specifically, when the rolling pressure of the first to third rolling mills is increased, the concentration of the cooling and lubricating fluid in the subsystem is set to 3% to 5%, thereby effectively reducing the rolling pressure, reducing energy consumption, and enabling the rolling mill to roll thinner strips. When the rolling pressure of the fourth to fifth rolling mills is lower, the concentration of the cooling and lubricating fluid in the subsystem is set to 1% to 2%, thereby saving oil consumption of the cooling and lubricating fluid. The concentration adjustment is achieved through real-time proportional adjustment of the oil replenishment inlet and the water replenishment inlet.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention features five independent cooling and lubrication circulation systems, each corresponding to a rolling mill. Each system has its own oil and water replenishment points, and the concentration of cooling and lubricating fluid for each rolling mill can be controlled separately.

[0022] This invention features a small liquid volume in each individual system, allowing for rapid adjustment of the cooling and lubricating fluid concentration. The reduction in the volume of each return tank significantly accelerates the adjustment speed of the cooling and lubricating fluid concentration required for the production process. Furthermore, the concentration of the cooling and lubricating fluid for each rolling mill stand can be adjusted individually based on the rolling force of each stand.

[0023] Each 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, allowing the cleanliness of the cooling and lubricating fluids in each mill to improve with each stand. This significantly improves the surface reflectivity of cold-rolled strip steel products.

[0024] The reduction rate is the percentage of the strip's thickness before rolling to its thickness after rolling, expressed as [(Hh) / H]%. A higher reduction rate results in a longer contact arc between the roll and the strip, a larger friction area, and more iron powder, leading to more severe contamination of the cooling lubricant. Typical cold rolling processes involve a gradual decrease in the reduction rate, meaning the first three stands generate more frictional iron powder, while the last two stands generate less. By employing independent cooling and lubrication systems corresponding to each stand, the cleanliness of the cooling lubricant increases sequentially from front to back, thereby improving the cleanliness and gloss of the strip exiting the mill.

[0025] The purging device between each stand and the independent collection tank in this invention achieve complete separation and independence of the cooling and lubricating fluid between each stand. Since the strip first enters the first stand and then enters the second to fifth stands in sequence, the cooling and lubricating fluid in the collection tank increases with each stand, which significantly improves the surface cleanliness and gloss of the strip at the mill exit. Attached Figure Description

[0026] To more clearly illustrate the embodiments of this utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0028] Explanation of icon numbers:

[0029] 1. First rolling mill; 2. Second rolling mill; 3. Third rolling mill; 4. Fourth rolling mill; 5. Fifth rolling mill; 6. Cooling and lubricating fluid collection tank of the first rolling mill; 7. Cooling and lubricating fluid collection tank of the second rolling mill; 8. Cooling and lubricating fluid collection tank of the third rolling mill; 9. Cooling and lubricating fluid collection tank of the fourth rolling mill; 10. Cooling and lubricating fluid collection tank of the fifth rolling mill; 11. Cooling and lubricating fluid return tank of the first rolling mill; 12. Cooling and lubricating fluid return tank of the second rolling mill; 13. Cooling and lubricating fluid return tank of the third rolling mill; 14. Cooling and lubricating fluid return tank of the fourth rolling mill; 15. Cooling and lubricating fluid return tank of the fifth rolling mill. 16. Liquid return tank; 17. Cleaning tank for the fifth mill; 18. Cleaning tank for the fourth mill; 19. Cleaning tank for the third mill; 20. Cleaning tank for the second mill; 21. Cleaning tank for the first mill; 22. Circulating pump for the fifth mill; 23. Circulating pump for the fourth mill; 24. Circulating pump for the third mill; 25. Circulating pump for the second mill; 26. Filter for the cooling and lubrication system of the fifth mill; 27. Filter for the cooling and lubrication system of the fourth mill; 28. Filter for the cooling and lubrication system of the third mill; 29. ​​Filter for the cooling and lubrication system of the second mill. 30. Filter of the cooling and lubrication system of the first mill; 31. Cooling and lubricating fluid injection circulation pump of the fifth mill; 32. Cooling and lubricating fluid injection circulation pump of the fourth mill; 33. Cooling and lubricating fluid injection circulation pump of the third mill; 34. Cooling and lubricating fluid injection circulation pump of the second mill; 35. Cooling and lubricating fluid injection circulation pump of the first mill; 36. Cooling and lubricating fluid injection flow rate control valve of the fifth mill; 37. Cooling and lubricating fluid injection flow rate control valve of the fourth mill; 38. Cooling and lubricating fluid injection flow rate control valve of the third mill; 39. Cooling and lubricating fluid injection flow rate control valve of the second mill; 40. Filter of the cooling and lubricating system of the first mill; 41. Cooling and lubricating fluid injection flow rate control valve for the first mill stand; 42. Cooling and lubricating fluid injection beam for the second mill stand; 43. Cooling and lubricating fluid injection beam for the third mill stand; 44. Cooling and lubricating fluid injection beam for the fourth mill stand; 45. Cooling and lubricating fluid injection beam for the fifth mill stand; 46. Space purging device after the first mill stand; 47. Space purging device after the second mill stand; 48. Space purging device after the third mill stand; 49. Space purging device after the fourth mill stand; 50. Space purging device after the fifth mill stand; 51. Strip steel; 52. Oil replenishment inlet; 53. Water replenishment inlet. Detailed Implementation

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] This utility model provides a technical solution: a cold rolling cooling and lubrication system, comprising five independently configured cooling and lubrication circulation subsystems, corresponding to the first to fifth rolling mill stands respectively; each subsystem includes:

[0035] The collection tank is used to receive the cooling and lubricating fluid sprayed out by the corresponding stand of the rolling mill;

[0036] The return tank, connected to the collection tank, is used to temporarily store the cooling lubricant and control the liquid level;

[0037] The cleaning tank, connected to the return tank via a circulation pump and filter, is used to filter iron powder and store the cleaned cooling lubricant.

[0038] The spray beam, connected to the cleaning tank via a flow control valve and a lubricant spray circulation pump, is used to spray cooling lubricant onto the rolls and strip surfaces of the corresponding stand.

[0039] Oil inlet 52 and water inlet 53 are independently located in the cleaning tanks of each subsystem and are used to adjust the concentration of coolant and lubricant respectively.

[0040] Each subsystem operates independently with a liquid holding capacity of 20m³. 3Furthermore, the cooling and lubricating fluid of adjacent racks is isolated by a space purging device to ensure that the subsystem operates independently.

[0041] The filters consist of an independently configured magnetic filter and a flat bed filter, corresponding to the first to fifth rolling mill stands respectively, with the filtration accuracy increasing with each stand, making the cleanliness of the cooling and lubricating fluid in the fifth rolling mill subsystem higher than that in the first stand.

[0042] The space purging device includes: purging nozzles installed at the exits of the first to fourth mill stands, used to blow the cooling lubricant on the strip surface into the collection tank of the corresponding subsystem and to prevent the liquid from entering the collection tank of the adjacent stand; and purging nozzles installed at the exit of the fifth mill stand, used to dry the strip surface to prevent corrosion.

[0043] The return tank has a volume of 20m³. 3 The liquid level is maintained at 50%, and each subsystem delivers cooling and lubricating fluid at a flow rate of 5000-6000 L / min via an independent circulation pump, with a concentration adjustment time of ≤5 min.

[0044] The spray beam consists of two rows of nozzles, one above the other, which are aimed at the upper and lower surfaces of the rolls and the strip, respectively. The nozzle density of the spray beam in the first to third stands is higher than that in the fourth to fifth stands.

[0045] The concentration of cooling and lubricating fluid in each subsystem is controlled independently. Specifically, the rolling pressure of the first to third mills is increased, and the concentration of cooling and lubricating fluid in the subsystem is set to 3% to 5%, thereby effectively reducing the rolling pressure, reducing energy consumption, and enabling the mills to roll thinner strips. The rolling pressure of the fourth to fifth mills is lower, and the concentration of cooling and lubricating fluid in the subsystem is set to 1% to 2%, thereby saving oil consumption of cooling and lubricating fluid. The concentration adjustment is achieved through real-time proportional adjustment of the oil replenishment inlet and the water replenishment inlet.

[0046] Example 1:

[0047] like Figure 1 As shown, this utility model provides a cold rolling cooling and lubrication system, comprising five independent cooling and lubrication circulation systems. Each circulation system corresponds to one rolling mill stand, and each system has its own oil and water replenishment points. The concentration of the cooling and lubricating fluid for each stand can be controlled independently. Each individual system has a small fluid volume, allowing for rapid adjustment of the cooling and lubricating fluid concentration. Each individual system has its own filter, resulting in high cleaning efficiency. The cooling and lubricating fluids for the five stands are independent and do not mix, ensuring that the cleanliness of the cooling and lubricating fluid for each stand increases with each stand. This significantly improves the surface reflectivity of cold-rolled strip steel products.

[0048] Specifically, it includes:

[0049] First rolling mill 1, strip entry end;

[0050] Second rolling mill 2;

[0051] Third rolling mill 3;

[0052] Fourth rolling mill 4;

[0053] Fifth rolling mill, strip exit end.

[0054] The cooling and lubricating fluid collection tank 6 of the first rolling mill has a volume of 30m³. 3 They collected the cooling and lubricating fluid sprayed from the first rolling mill.

[0055] The cooling and lubricating fluid collection tank 7 of the second rolling mill has a volume of 30m³. 3 Collect the cooling and lubricating fluid sprayed from the second rolling mill.

[0056] The cooling and lubricating fluid collection tank 8 of the third rolling mill has a volume of 30m³. 3 Collect the cooling and lubricating fluid sprayed from the third rolling mill.

[0057] The cooling and lubricating fluid collection tank 9 of the fourth rolling mill has a volume of 30m³. 3 Collect the cooling and lubricating fluid sprayed from the fourth rolling mill.

[0058] The fifth rolling mill cooling and lubricating fluid collection tank 10 has a volume of 30m³. 3 Collect the cooling and lubricating fluid sprayed from the fifth rolling mill.

[0059] The first mill cooling lubricant return tank 11 receives cooling lubricant from the first mill cooling lubricant collection tank 6, with a volume of 20m³. 3 The liquid level is maintained at 50%.

[0060] The second mill cooling lubricant return tank 12 receives cooling lubricant from the second mill cooling lubricant collection tank 7, with a volume of 20m³. 3 The liquid level is maintained at 50%.

[0061] The third mill cooling lubricant return tank 13 receives cooling lubricant from the third mill cooling lubricant collection tank 8, with a volume of 20m³. 3 The liquid level is maintained at 50%.

[0062] The fourth mill cooling lubricant return tank 14 receives cooling lubricant from the fourth mill cooling lubricant collection tank 9, with a volume of 20m³. 3 The liquid level is maintained at 50%.

[0063] The fifth mill cooling and lubricating fluid return tank 15 receives cooling and lubricating fluid from the fifth mill cooling and lubricating fluid collection tank 10, with a volume of 20m³. 3 The liquid level is maintained at 50%.

[0064] The fifth rolling mill's cleaning tank 16 has a volume of 20m³. 3 The liquid level is maintained at 50%. The cooling and lubricating fluid of the fifth mill returning to the cooling and lubricating fluid return tank 15 enters the cleaning tank 16 of the fifth mill through the filter 26 of the fifth mill cooling and lubrication system. The cooling and lubricating fluid in the cleaning tank 16 of the fifth mill is sprayed onto the fifth mill 5.

[0065] The cleaning tank 17 of the fourth rolling mill has a volume of 20m³. 3 The liquid level is maintained at 50%. The cooling and lubricating fluid of the fourth mill return tank 14 enters the cleaning tank 17 of the fourth mill through the filter 27 of the cooling and lubrication system of the fourth mill. The cooling and lubricating fluid in the cleaning tank 17 of the fourth mill is sprayed onto the fourth mill 4.

[0066] The cleaning tank 18 of the third rolling mill has a volume of 20m³. 3 The liquid level is maintained at 50%. The cooling and lubricating fluid of the third mill return tank 13 enters the cleaning tank 18 of the third mill through the filter 28 of the cooling and lubrication system of the third mill. The cooling and lubricating fluid in the cleaning tank 18 is sprayed onto the third mill 3.

[0067] The cleaning tank 19 of the second rolling mill has a volume of 20m³. 3 The liquid level is maintained at 50%. The cooling and lubricating fluid of the second mill return tank 12 enters the cleaning tank 19 of the second mill through the filter 29 of the second mill cooling and lubrication system. The cooling and lubricating fluid in the cleaning tank 19 of the second mill is sprayed onto the second mill 2.

[0068] The first rolling mill's cleaning tank 20 has a volume of 20m³. 3 The liquid level is maintained at 50%. The cooling and lubricating fluid of the first rolling mill return tank 11 enters the cleaning tank 20 of the first rolling mill through the filter 30 of the cooling and lubrication system of the first rolling mill. The cooling and lubricating fluid in the cleaning tank 20 of the first rolling mill is sprayed onto the first rolling mill.

[0069] The fifth mill circulation pump 21 returns the cooling and lubricating fluid in the fifth mill return tank 15 to the cleaning tank 16 of the fifth mill through the filter 26 of the fifth mill cooling and lubrication system.

[0070] The fourth mill circulation pump 22 returns the cooling and lubricating fluid of the fourth mill to the cooling and lubricating fluid return tank 14 and then delivers it to the cleaning tank 17 of the fourth mill through the filter 27 of the cooling and lubrication system.

[0071] The third mill circulation pump 23 returns the cooling and lubricating fluid of the third mill to the cooling and lubricating fluid return tank 13, and then delivers it to the cleaning tank 18 of the third mill through the filter 28 of the cooling and lubrication system.

[0072] The second mill circulation pump 24 returns the cooling and lubricating fluid of the second mill to the cooling and lubricating fluid return tank 12, and then delivers it to the cleaning tank 19 of the second mill through the filter 29 of the second mill cooling and lubrication system.

[0073] The first mill circulation pump 25 returns the first mill cooling and lubricating fluid to the tank 11, and then delivers it through the filter 30 of the first mill cooling and lubrication system to the first mill cleaning tank 20.

[0074] The filter 26 of the cooling and lubrication system of the fifth rolling mill filters iron powder from the liquid.

[0075] The filter 27 of the cooling and lubrication system of the fourth rolling mill filters iron powder from the liquid.

[0076] The filter 28 of the cooling and lubrication system of the third rolling mill filters iron powder from the liquid.

[0077] The filter 29 of the cooling and lubrication system of the second rolling mill filters iron powder from the liquid.

[0078] The filter 30 of the cooling and lubrication system of the first rolling mill filters iron powder from the liquid.

[0079] The fifth rolling mill cooling and lubricating fluid injection circulation pump 31 has a flow rate of 5000-6000 L / min.

[0080] The fourth rolling mill cooling and lubricating fluid injection circulation pump 32 has a flow rate of 5000-6000 L / min.

[0081] The third rolling mill cooling and lubricating fluid injection circulation pump 33 has a flow rate of 5000-6000 L / min.

[0082] The second mill cooling and lubricating fluid injection circulation pump 34 has a flow rate of 5000-6000 L / min.

[0083] The first rolling mill cooling and lubricating fluid injection circulation pump 35 has a flow rate of 5000-6000 L / min.

[0084] The fifth rolling mill cooling lubricant injection flow rate control valve 36 controls the injection flow rate.

[0085] The fourth rolling mill cooling lubricant injection flow rate control valve 37 controls the injection flow rate.

[0086] The third mill cooling lubricant injection flow rate control valve 38 controls the injection flow rate.

[0087] The second mill cooling lubricant injection flow rate control valve 39 controls the injection flow rate.

[0088] The first mill cooling lubricant injection flow rate control valve 40 controls the injection flow rate.

[0089] The first mill cooling and lubricating fluid spray beam 41 has a row of nozzles arranged above and below the strip to spray cooling and lubricating fluid onto the first mill rolls and the upper and lower surfaces of the inlet strip.

[0090] The second mill cooling and lubricating fluid spray beam 42 has a row of nozzles arranged on the upper and lower sides of the strip to spray cooling and lubricating fluid onto the rolls of the second mill and the upper and lower surfaces of the inlet strip.

[0091] The third stand of the rolling mill has a cooling and lubricating fluid spray beam 43, with a row of nozzles arranged on the upper and lower sides of the strip to spray cooling and lubricating fluid onto the rolls of the third stand and the upper and lower surfaces of the inlet strip.

[0092] The fourth stand of the rolling mill has a cooling and lubricating fluid spray beam 44, with a row of nozzles arranged on the upper and lower sides of the strip to spray cooling and lubricating fluid onto the rolls of the fourth stand and the upper and lower surfaces of the inlet strip.

[0093] The fifth mill's cooling and lubricating fluid spray beam 45 has a row of nozzles arranged on the top and bottom of the strip to spray cooling and lubricating fluid onto the fifth mill rolls and the upper and lower surfaces of the inlet strip.

[0094] The space purging device 46 behind the first mill has a row of nozzles arranged above and below the strip to purge the upper and lower surfaces of the strip at the exit of the first mill, ensuring that liquid enters the collection tank 6 of this mill and preventing liquid from entering the collection tank 7.

[0095] The space purging device 47 behind the second mill has a row of nozzles arranged above and below the strip to purge the upper and lower surfaces of the strip at the exit of the second mill, ensuring that liquid enters the collection tank 7 of this mill and preventing liquid from entering the collection tank 8.

[0096] The space purging device 48 behind the third mill has a row of nozzles arranged on the top and bottom of the strip to purge the upper and lower surfaces of the strip at the exit of the third mill, ensuring that liquid enters the collection tank 8 of this mill and preventing liquid from entering the collection tank 9.

[0097] The space purging device 49 after the fourth mill has a row of nozzles arranged on the top and bottom of the strip to purge the upper and lower surfaces of the strip at the exit of the fourth mill, ensuring that liquid enters the collection tank 9 of this mill and preventing liquid from entering the collection tank 10.

[0098] The space purging device 50 behind the fifth mill has a row of nozzles arranged on the top and bottom of the strip to purge the upper and lower surfaces of the strip at the exit of the fifth mill, ensuring that the surface of the strip is dry after rolling and preventing rust.

[0099] For strip steel 51, during the production process, the two coils of strip steel are rapidly welded together to maintain continuous rolling.

[0100] Each cleaning tank has an oil replenishment inlet of 52.

[0101] Each cleaning tank has a water inlet of 53.

[0102] The circulation path of each rolling mill stand:

[0103] The cooling and lubrication circulation path of the first rolling mill 1 is: collection tank 6 — return tank 11 — circulation pump 25 — filter 30 — cleaning tank 20 — circulation pump 35 — control valve 40 — spray beam 41 — collection tank 6.

[0104] The cooling and lubrication circulation path of the second mill 2 is: collection tank 7 — return tank 12 — circulation pump 24 — filter 29 — cleaning tank 19 — circulation pump 34 — control valve 39 — spray beam 42 — collection tank 7.

[0105] The cooling and lubrication circulation path of the third mill stand 3 is: collection tank 8 — return tank 13 — circulation pump 23 — filter 28 — cleaning tank 18 — circulation pump 33 — control valve 38 — spray beam 43 — collection tank 8.

[0106] The cooling and lubrication circulation path of the fourth mill 4 is: collection tank 9—return tank 14—circulation pump 22—filter 27—cleaning tank 17—circulation pump 32—control valve 37—spray beam 44—collection tank 9.

[0107] The cooling and lubrication circulation path of the fifth rolling mill 5 is as follows: collection tank 10 — return tank 15 — circulation pump 21 — filter 26 — cleaning tank 16 — circulation pump 31 — control valve 36 — spray beam 45 — collection tank 10.

[0108] In existing technology, the cooling and lubrication of each mill stand shares a single system, including a collection tank, a return tank, a cleaning tank, and a filter. The concentration of the cooling and lubricating fluid sprayed on each mill stand is the same, and it cannot be controlled individually for each stand. This system is divided into five separate systems for each mill stand, and the concentration can be adjusted by adding oil or water to each system as needed.

[0109] In existing technology, the cooling and lubrication of each rolling mill stand shares a single system, with a liquid retention volume of 150–200 mg / L. 3 The concentration adjustment process requires more than 3 hours. This system consists of five independent systems with small liquid holding capacities; each system has a liquid holding capacity of 20m³. 3 Based on a flow rate of 5000 L / min, the concentration adjustment time is only about 5 minutes.

[0110] In existing technology, each stand shares a single filtration device, resulting in uniform cleanliness of the sprayed cooling and lubricating fluid, and low surface reflectivity of the strip after rolling. This application utilizes an air purging device after each stand to enable completely independent circulation of the cooling and lubrication systems of each stand. During rolling, the rolling force decreases with each stand, the hardening degree of the strip increases with each stand, and the iron powder generated on the strip surface due to friction between the rolls and the strip decreases with each stand. Therefore, the cleanliness of the cooling and lubricating fluid circulating from the first to the fifth stand increases with each stand, and the surface reflectivity of the strip after rolling increases from 82% to 95%. The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A cold-rolling cooling and lubrication system, characterized in that, It includes five independently configured cooling and lubrication circulation subsystems, corresponding to the first through fifth rolling mills respectively; each subsystem includes: The collection tank is used to receive the cooling and lubricating fluid sprayed out by the corresponding stand of the rolling mill; The return tank, connected to the collection tank, is used to temporarily store the cooling lubricant and control the liquid level; A cleaning tank, connected to the return tank via a circulation pump and a filter, is used to filter iron powder and store the cleaned cooling lubricant; The spray beam, connected to the cleaning tank via a flow control valve and a lubricant spray circulation pump, is used to spray cooling lubricant onto the rolls and strip surfaces of the corresponding stand. The oil inlet (52) and water inlet (53) are independently located in the cleaning tank of each subsystem and are used to adjust the concentration of the coolant and lubricant respectively. Each subsystem operates independently with a liquid holding capacity of 20m³. 3 Furthermore, the cooling and lubricating fluid of adjacent racks is isolated by a space purging device to ensure that the subsystem operates independently.

2. The cold rolling cooling and lubrication system according to claim 1, characterized in that, The filters are independently configured magnetic filters and flatbed filters, corresponding to the first to fifth rolling mill stands, respectively.

3. The cold rolling cooling and lubrication system according to claim 1, characterized in that, The space purging device includes: purging nozzles located at the outlets of the first to fourth mill stands, used to blow the cooling lubricant on the strip surface into the collection tank of the corresponding subsystem and to prevent the liquid from entering the collection tank of the adjacent stand; and purging nozzles located at the outlet of the fifth mill stand, used to dry the strip surface to prevent corrosion.

4. The cold rolling cooling and lubrication system according to claim 1, characterized in that, The return tank has a volume of 20m³. 3 The liquid level is maintained at 50%, and each subsystem delivers cooling and lubricating fluid at a flow rate of 5000-6000 L / min via an independent circulation pump, with a concentration adjustment time of ≤5 min.

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

6. The cold rolling cooling and lubrication system according to claim 1, characterized in that, The concentration of cooling and lubricating fluid in each subsystem is controlled independently. Specifically, the rolling pressure of the first to third mills is increased, and the concentration of cooling and lubricating fluid in the subsystem is set to 3% to 5%, thereby effectively reducing the rolling pressure, reducing energy consumption, and enabling the mills to roll thinner strips. The rolling pressure of the fourth to fifth mills is lower, and the concentration of cooling and lubricating fluid in the subsystem is set to 1% to 2%, thereby saving oil consumption of cooling and lubricating fluid. The concentration adjustment is achieved through real-time proportional adjustment of the oil replenishment inlet and the water replenishment inlet.

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