Oil and water supply system of rolling mill

Abstract

The present invention relates to an oil and water supply system for a rolling mill, and belongs to the field of rolling mill production. It includes a rolling oil supply unit for providing rolling oil to the spray beam, and a waste liquid treatment unit for recovering and treating spray waste liquid. The rolling oil supply unit includes an original oil tank for storing rolling oil, and the waste liquid treatment unit includes a wastewater discharge pipeline and a purified oil outlet pipeline. The system provided by the present invention also includes a purified oil supply unit. The waste liquid treatment unit transports the purified oil to the purified oil tank of the purified oil supply unit through the purified oil outlet pipeline. The outlet of the purified oil tank is connected to the first oil outlet pipeline of the original oil tank outlet through the second oil outlet pipeline. The first oil outlet pipeline and the second oil outlet pipeline merge to form an oil supply pipeline extending to the spray beam. The present invention avoids mutual contamination between purified oil and rolling oil crude oil by optimizing the working path of the purified oil, thereby realizing online recovery and online utilization of waste oil.

Description

Technical Field

[0001] The invention belongs to the field of rolling mill production and relates to an oil and water supply system of a rolling mill. Background Art

[0002] During the cold rolling process, metal materials undergo work hardening, causing their deformation resistance to increase continuously with the total deformation in a single rolling pass. To reduce frictional and deformation heat generated during the rolling process, improve rolling conditions, and control roll deformation, lubricants such as rolling oil, emulsion, and cooling water are often sprayed into the rolling mill in actual production. Due to the high viscosity of some lubricants, when the system is opened or closed, or when pipelines are switched, the lubricant within the pipeline cannot flow in or out promptly and quickly, resulting in a lag in the system's response to control commands, particularly impacting the rolling efficiency of discontinuous sheet metal.

[0003] In addition, to reduce lubricant waste and improve lubricant utilization, prior art cooling and lubrication systems incorporate a purification process to recirculate the purified lubricant back into the supply system. For example, patent publication CN114144266A discloses a rolling method, a metal plate manufacturing method, and a rolling apparatus, which describe a dual-system rolling oil supply and recovery process for a cold rolling mill. This solution utilizes two or three emulsion supply systems to switch between different emulsions for the final and preceding stands, meeting the requirements for different emulsions used in the production of different steel grades. The return system returns the used emulsion to the corresponding return tank, where it is purified by a filtration system (vacuum filter, magnetic filter) before being returned to the supply tank for recycling. However, the used emulsion waste liquid contains numerous impurities. For economic reasons, it is typically not treated to a 100% clean emulsion concentrate. The filtration system in this solution reduces the impurity concentration within the emulsion waste liquid to a certain level before returning it to service. In other words, this solution mixes the purified lubricating medium with the original lubricating medium, which will reduce the quality of the entire lubricating medium in the system, greatly increase the frequency of cleaning and updating of the liquid tank, affect production efficiency, and is not conducive to the recovery and reuse of the lubricating medium. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide an oil and water supply system for a rolling mill that can realize online recovery and online utilization of waste oil, and avoid mutual contamination between purified oil and rolling oil crude oil by optimizing the working path of purified oil.

[0005] To achieve the above objectives, the present invention provides an oil and water supply system for a rolling mill, comprising a rolling oil supply unit for supplying rolling oil to a spray beam, and a waste liquid treatment unit for recovering and treating waste liquid from the spray. The rolling oil supply unit includes a crude oil tank for storing rolling oil, while the waste liquid treatment unit includes a wastewater discharge pipeline and a purified oil outlet pipeline. Furthermore, the spray beam is equipped with several spray heads facing the rolling mill, each of which is independently controlled by an electric valve to provide different spray ranges for plates of different widths.

[0006] Optionally, the oil and water supply system for a rolling mill provided by the present invention further includes a purified oil supply unit, wherein the waste liquid treatment unit delivers purified oil to a purified oil tank of the purified oil supply unit via a purified oil outlet pipeline. Furthermore, the outlet of the purified oil tank is connected to the first oil outlet pipeline of the crude oil tank outlet via a second oil outlet pipeline. The first and second oil outlet pipelines merge to form an oil supply pipeline extending to the spray beam.

[0007] Optionally, a first valve and a third valve are provided on the first oil outlet pipeline and the second oil outlet pipeline, respectively, to switch the type of lubricating oil entering the oil supply pipeline.

[0008] Optionally, an injection control assembly and an oil supply main control valve are sequentially arranged along the oil flow direction of the oil supply pipeline to control the injection process. The injection control assembly includes at least two sets of manual switch valves, a liquid supply pump, a pressure gauge and a check valve connected in sequence.

[0009] Optionally, a first oil return line connected to the crude oil tank and a second oil return line connected to the purified oil tank extend between the main oil supply control valve and the injection control assembly. A second valve and a fourth valve are provided on the first and second oil return lines, respectively, to switch the type of lubricant returning to the crude oil tank and the purified oil tank.

[0010] When the first valve is opened and the third valve is closed, the rolling oil in the crude oil tank is provided to the injection control assembly and transported to the injection beam through the oil supply pipeline; when the first valve is closed and the third valve is opened, the purified oil in the purified oil tank is provided to the injection control assembly and transported to the injection beam through the oil supply pipeline.

[0011] When the second valve is opened and the fourth valve is closed, the rolling oil flows back to the crude oil tank through the first return oil pipeline. At this time, the first valve is opened and the third valve is closed, forming a rolling oil supply path and a rolling oil internal circulation path; when the second valve is closed and the fourth valve is opened, the purified oil flows back to the purified oil tank through the second return oil pipeline. At this time, the first valve is closed and the third valve is opened, forming a purified oil supply path and a purified oil internal circulation path.

[0012] Optionally, the first and second valves of the rolling oil supply unit open and close synchronously, while the third and fourth valves of the purified oil supply unit open and close synchronously. Specifically, the opening and closing states of the first and second valves are opposite to those of the third and fourth valves. In other words, the rolling oil supply unit and the purified oil supply unit are not activated simultaneously. Instead, rolling oil and purified oil are supplied to the oil supply pipeline alternately, serving as backup for each other to compensate for the oil supply system downtime caused by refilling, changing, or cleaning the crude oil tank.

[0013] Optionally, the present invention also includes a cooling water supply unit for providing cooling water to the spray beam, the cooling water supply unit including a water supply tank and a water supply pipeline, one end of the water supply pipeline is connected to the outlet of the water supply tank through a water spray control assembly, and the other end is connected to the spray beam. Furthermore, a return water pipeline is provided on the water supply pipeline for guiding the cooling water back to the water supply tank. Furthermore, the cooling water supply unit also includes a fifth valve provided on the water supply pipeline and a sixth valve provided on the return water pipeline to switch the cooling water supply path and the internal circulation path. When the fifth valve and the sixth valve are opened, the cooling water is connected to the spray beam through the water supply pipeline, and the nozzle on the spray beam sprays cooling water to the rolling mill. At the same time, the cooling water branch flows back to the water supply tank through the return water pipeline to form an internal circulation path for cooling water. It should be noted that the cooling water in this system is not limited to the "cooling" function. During production, the cooling water and rolling oil both play the dual role of cooling and lubrication.

[0014] Optionally, the waste liquid treatment unit includes a waste liquid collection pipeline and a buffer oil tank. One end of the waste liquid collection pipeline is connected to a collection tray at the bottom of the rolling mill, and the other end is split into a wastewater collection pipeline connected to the wastewater tank and a waste oil collection pipeline connected to the buffer oil tank. Furthermore, a seventh valve and an eighth valve are respectively installed on the wastewater collection pipeline and the waste oil collection pipeline to switch between different waste liquid treatment channels.

[0015] Optionally, the outlet of the cache oil tank is connected to a filtering and purifying device, the purified oil outlet of the filtering and purifying device is connected to the purified oil tank through a purified oil outlet pipeline, and the filtered water outlet of the filtering and purifying device merges with the wastewater collection pipeline to form a wastewater discharge pipeline.

[0016] Optionally, the waste liquid treatment unit includes a waste liquid collection pipeline and a buffer oil tank, one end of the waste liquid collection pipeline is connected to the collection plate at the bottom of the rolling mill, and the other end is branched to form a wastewater collection pipeline connected to the wastewater pool and a waste oil collection pipeline connected to the buffer oil tank.

[0017] Optionally, a seventh valve and an eighth valve may be installed on the wastewater collection pipeline and the waste oil collection pipeline, respectively, to switch between different waste liquid treatment channels. When the seventh valve is open and the eighth valve is closed, the fifth and sixth valves of the cooling water supply unit are open, the valves of the rolling oil supply unit or the purified oil supply unit are closed, and the nozzle is in a water spraying mode. The waste liquid collection pipeline directs wastewater from the collection tray at the bottom of the rolling mill to the wastewater collection pipeline, ultimately flowing into the wastewater tank. When the eighth valve is open and the seventh valve is closed, the fifth and sixth valves of the cooling water supply unit are closed, the first and second valves of the rolling oil supply unit or the third and fourth valves of the purified oil supply unit are opened, and the nozzle is in an oil spraying mode. The waste liquid collection pipeline directs waste oil from the collection tray at the bottom of the rolling mill to the waste oil collection pipeline, ultimately flowing into the buffer tank.

[0018] Optionally, the outlet of the cache oil tank is connected to a filtering and purifying device, the purified oil outlet of the filtering and purifying device is connected to the purified oil tank through a purified oil outlet pipeline, and the filtered water outlet of the filtering and purifying device merges with the wastewater collection pipeline to form a wastewater discharge pipeline.

[0019] Furthermore, the filtration and purification device includes a conical collection barrel, an oil suction filter, a filter pump, a glass fiber filter, a primary purification unit, a secondary purification unit, a water separator, and a pneumatic valve. The conical collection barrel uses sedimentation filtration to coarsely filter the waste oil, removing a large amount of water from the waste oil. An oil suction filter and a glass fiber filter are placed before and after the filter pump to remove impurities from the waste oil. Furthermore, the filters use a mesh size and filter paper. Both the primary and secondary purification units utilize oleophilic and hydrophobic filter cartridges to further separate the oil and water, producing purified oil that meets standards. Specifically, the preferred purification standard for the waste rolling oil is a cleanliness level of at least 98%.

[0020] Optionally, each of the oil and water control assemblies includes at least two sets of sequentially connected manual on / off valves, a liquid supply pump, a pressure gauge, and a check valve to control the supply pressure of the rolling oil, purified oil, or cooling water. The two sets of manual on / off valves, liquid supply pumps, pressure gauges, and check valves serve as backup to prevent production interruptions caused by equipment failure.

[0021] Optionally, flow meters are provided on the oil supply pipeline and the water supply pipeline to control the supply flow of rolling oil, purified oil or cooling water.

[0022] Optionally, a stirrer, a heater, a liquid level detection and alarm device, and a temperature detection and alarm device are provided in both the crude oil tank and the purified oil tank, and a heater, a liquid level detection and alarm device, and a temperature detection and alarm device are provided in the water supply tank.

[0023] Optionally, the valves related to process switching are automatic valves, that is, the first valve to the eighth valve on each pipeline and the main oil supply control valve are all automatic valves, and the valves related to system start and stop are manual valves, that is, the manual switching valves in the oil injection control assembly and the water spray control assembly.

[0024] The beneficial effects of the present invention are:

[0025] During the steel rolling process, rolling oil and cooling water primarily serve to cool the mill and lubricate it. Oil and water injection into the mill is typically performed alternately. Before rolling begins, both rolling oil and cooling water are in their own internal circulation. When the system supplies cooling water to the spray beam, the rolling oil or purified oil maintains its own internal circulation, with the cooling water switching from internal circulation to supply mode under the control of the corresponding valve. When the system switches from water injection to oil injection, the cooling water switches to internal circulation, and the rolling oil or purified oil switches from internal circulation to supply mode under the control of the corresponding valve.

[0026] First, compared to the prior art, which frequently requires the start and stop of the liquid supply pump, the present invention only requires controlling the valves on the corresponding pipelines to achieve rapid switching between water spraying and oil spraying during process switching, which greatly shortens the response time and reduces the labor intensity on site. In addition, the internal circulation of rolling oil or purified oil in the standby state allows the lubricating medium to always remain in a flowing state, thereby suppressing the lag in the liquid supply, cut-off, and switching processes caused by the viscosity of the fluid. It can be seen that in terms of process switching, the present invention simplifies the operational difficulty, reduces the system's processing capacity requirements, and also increases the controllability of oil and water supply and switching.

[0027] Furthermore, the present invention incorporates waste oil purification into the supply system. The sprayed rolling oil is collected and purified into reusable purified oil, which is then re-used in the system or collected and sold, minimizing rolling oil waste and lowering production costs. Furthermore, the rolling oil and purified oil are supplied independently and serve as backup for each other, preventing contamination of oil from different tanks and compensating for the oil supply gap caused by refilling, changing, or cleaning the original tank, thereby improving production efficiency to a certain extent.

[0028] In addition, the independent supply and rapid switching of oil and water in the present invention can meet the process requirements of the rolling process of different steel grades, especially the cooling and lubrication process of non-continuous plate rolling, making the supply system provided by the present invention more flexible and applicable.

[0029] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0031] Figure 1 A functional connection diagram of an oil and water supply system for a rolling mill provided by the present invention;

[0032] Figure 2 This is one of the structural schematic diagrams of the oil and water supply system of a rolling mill provided by the present invention;

[0033] Figure 3 This is a second structural diagram of an oil and water supply system for a rolling mill provided by the present invention;

[0034] Figure 4 This is a structural diagram of an oil injection control component of an oil and water supply system of a rolling mill provided by the present invention.

[0035] Figure 1: 100-rolling oil supply unit; 110-crude oil tank; 120-first valve; 130-second valve; 140-first oil return pipeline; 150-rolling oil outlet pipeline; 200-purified oil supply unit; 210-purified oil tank; 220-third valve; 230-fourth valve; 240-second oil return pipeline; 250-purified oil outlet pipeline; 300-cooling water supply unit; 310-water supply tank; 320-water spray control assembly; 330-fifth valve; 340-sixth valve; 350-water supply pipeline; 360-return water pipeline; 370-water filter; 400-waste liquid treatment unit; 410-cache oil Box; 420-filtration and purification device; 421-filtered water outlet; 422-purified oil outlet; 430-wastewater tank; 440-waste liquid collection pipeline; 441-wastewater collection pipeline; 442-waste oil collection pipeline; 450-seventh valve; 460-eighth valve; 470: wastewater discharge pipeline; 480-purified oil outlet pipeline; 500-injection control assembly; 510-oil supply pipeline; 511-oil supply main control valve; 520-manual switch valve; 530-liquid supply pump; 540-pressure gauge; 550-check valve; 600-rolling mill; 610-injection beam; 620-nozzle; 630-collection tray; 700-flow meter. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] One embodiment of the present invention, as Figure 1 As shown, the present invention provides an oil and water supply system for a rolling mill, comprising a rolling oil supply unit 100, a purified oil supply unit 200, a cooling water supply unit 300, and a waste liquid treatment unit 400. The rolling oil supply unit 100 and the purified oil supply unit 200 are connected in parallel at both ends of an oil injection control assembly 500. Specifically, the rolling oil supply unit 100 and the purified oil supply unit 200 are respectively connected to the oil injection control assembly 500. After passing through the oil injection control assembly 500, the rolling oil and purified oil are transported to the rolling mill 600 via a single pipeline. The cooling water supply unit 300 is independently provided and operates alternately with the rolling oil supply unit 100 or the purified oil supply unit 200. The waste liquid treatment unit 400 is provided below the rolling mill 600 and is used to collect wastewater or waste oil and perform corresponding treatment.

[0040] Optional, such as Figure 2 、 Figure 3As shown, the rolling oil supply unit 100 and the purified oil supply unit 200 are each connected to an oil spray control assembly 500. The oil spray control assembly 500 delivers rolling oil or purified oil via an oil supply line 510 to a spray beam 610. The spray beam 610 is equipped with several spray heads 620 facing the rolling mill 600. Each spray head 620 is independently controlled by a solenoid valve to provide a different spray range for plates of different widths. When the rolling oil supply unit 100 or the purified oil supply unit 200 is in operation, rolling oil or purified oil is supplied to the spray beam 610. The spray heads 620 on the spray beam 610 spray rolling oil or purified oil toward the rolling mill 600 to achieve lubrication. When the cooling water supply unit 300 is in operation, cooling water is supplied to the spray beam 610. The spray heads 620 on the spray beam 610 spray cooling water toward the rolling mill 600 to achieve cooling.

[0041] Furthermore, the oil supply pipeline 510 is provided with a first return oil pipeline 140 and a second return oil pipeline 240 for respectively guiding the rolling oil and purified oil back to the rolling oil supply unit 100 and the purified oil supply unit 200 near the injection control assembly 500, and the oil supply pipeline 510 is provided with an oil supply main control valve 511 near the injection beam 610.

[0042] Optionally, the rolling oil supply unit 100 includes a crude oil tank 110 for storing raw rolling oil. A first oil return line 140 extends from the oil supply line 510 and connects to the crude oil tank 110, forming an internal circulation path for the rolling oil. A first valve 120 is installed on the line connecting the crude oil tank 110 and the oil injection control assembly 500 to control whether the rolling oil enters the oil injection control assembly 500. A second valve 130 is installed on the first oil return line 140 to control whether the fluid in the oil supply line 510 flows back into the crude oil tank 110 through the first oil return line 140.

[0043] The purified oil supply unit 200 includes a purified oil tank 210 for storing purified oil. A second oil return line 240 extends from the oil supply line 510 and connects to the purified oil tank 210, forming an internal circulation path for the purified oil. A third valve 220 is installed on the line connecting the purified oil tank 210 and the injection control assembly 500 to control whether the purified oil enters the injection control assembly 500. A fourth valve 230 is installed on the second oil return line 240 to control whether the fluid in the oil supply line 510 flows back into the purified oil tank 210 through the second oil return line 240.

[0044] It should be noted that the first valve 120 and second valve 130 of the rolling oil supply unit 100 open and close synchronously, and the third valve 220 and fourth valve 230 of the purified oil supply unit 200 open and close synchronously. Specifically, the opening and closing states of the first valve 120 and second valve 130 are opposite to those of the third valve 220 and fourth valve 230. In other words, the rolling oil supply unit 100 and the purified oil supply unit 200 are not activated simultaneously; rolling oil and purified oil are supplied to the oil supply line 510 alternately. The rolling oil and purified oil serve as backup to each other, compensating for the oil supply system downtime caused by refilling or changing the crude oil tank 110.

[0045] Specifically, when the first valve 120 is open and the third valve 220 is closed, the rolling oil in the crude oil tank 110 is supplied to the injection control assembly 500 and transported to the injection beam 610 via the oil supply line 510. At this time, the second valve 130 is open and the fourth valve 230 is closed, and the rolling oil flows back to the crude oil tank 110 through the first oil return line 140, forming a rolling oil supply path and a rolling oil internal circulation path. When the first valve 120 is closed and the third valve 220 is open, the purified oil in the purified oil tank 210 is supplied to the injection control assembly 500 and transported to the injection beam 610 via the oil supply line 510. At this time, the second valve 130 is closed and the fourth valve 230 is open, and the purified oil flows back to the purified oil tank through the second oil return line 240, forming a purified oil supply path and a purified oil internal circulation path.

[0046] Optionally, the supply system provided herein also includes a cooling water supply unit 300 that operates alternately with the rolling oil supply unit 100 or the purified oil supply unit 200. The cooling water supply unit 300 includes a water supply tank 310 and a water supply pipeline 350. One end of the water supply pipeline 350 is connected to the outlet of the water supply tank 310 via a water spray control assembly 320, and the other end is connected to the spray beam 610. The water supply tank 310 is connected to an external industrial water network. After passing through a water filter 370, the industrial purified water enters the cooling water supply unit 300 and is stored in the water supply tank 310. Furthermore, the water supply pipeline 350 is provided with a return line 360 ​​for directing cooling water back to the water supply tank 310. Furthermore, a fifth valve 330 is provided on the water supply pipeline 350, and a sixth valve 340 is provided on the return line 360 ​​to switch between the cooling water supply path and the internal circulation path. When the fifth valve 330 and the sixth valve 340 are opened, the cooling water is connected to the spray beam 610 through the water supply pipe 350, and the nozzle 620 on the spray beam 610 sprays cooling water to the rolling mill 600. At the same time, the cooling water branch flows back to the water supply tank 310 through the return pipe 360 ​​to form an internal circulation path for cooling water.

[0047] Optionally, the supply system provided herein also includes a waste liquid treatment unit 400 for treating waste oil and wastewater. This unit comprises a buffer oil tank 410, a filter and purification device 420, a wastewater tank 430, a waste liquid collection pipeline 440, a wastewater discharge pipeline 470, and a purified oil outlet pipeline 480. One end of the waste liquid collection pipeline 440 is connected to a collection tray 630 at the bottom of the rolling mill 600. The other end splits into two paths: a waste water collection pipeline 441 connected to the wastewater tank 430, and a waste oil collection pipeline 442 connected to the buffer oil tank 410. Furthermore, a seventh valve 450 and an eighth valve 460 are provided on the waste water collection pipeline 441 and the waste oil collection pipeline 442, respectively, to switch between different waste liquid treatment channels.

[0048] It should be noted that the seventh valve 450 on the wastewater collection pipeline 441 is opened and closed synchronously with the valve of the cooling water supply unit 300 to collect wastewater during the cooling water spraying stage; the eighth valve 460 on the waste oil collection pipeline 442 is opened and closed synchronously with the valve of the rolling oil supply unit 100 or the purified oil supply unit 200 to collect waste oil during the lubricating oil spraying stage.

[0049] Specifically, when the seventh valve 450 is open and the eighth valve 460 is closed, the fifth and sixth valves 330 and 340 of the cooling water supply unit 300 are open, the valves of the rolling oil supply unit 100 or the purified oil supply unit 200 are closed, and the nozzle 620 is in a water spraying state. The wastewater collection line 440 directs wastewater from the collection pan 630 at the bottom of the rolling mill 600 to the wastewater collection line 441, and ultimately flows into the wastewater tank 430 through the wastewater discharge line 470. When the eighth valve 460 is open and the seventh valve 450 is closed, the fifth and sixth valves 330 and 340 of the cooling water supply unit 300 are closed, the first and second valves 120 and 130 of the rolling oil supply unit 100 or the third and fourth valves 220 and 230 of the purified oil supply unit 200 are open, and the nozzle 620 is in an oil spraying state. The waste liquid collection pipeline 440 guides the waste oil in the collection tray 630 at the bottom of the rolling mill 600 to the waste oil collection pipeline 442 , and finally flows into the buffer oil tank 410 .

[0050] The outlet of the buffer oil tank 410 is equipped with a filter and purification device 420. This device has a filtered water outlet 421 and a purified oil outlet 422. Purified oil outlet 422 is connected to the purified oil tank 210 via a purified oil outlet line 480. Filtered water outlet 421 merges with a wastewater collection line 441 to form a wastewater discharge line 470. Filter and purification device 420 processes waste oil into purified oil that meets standards and delivers the treated purified oil to the purified oil tank 210 via the purified oil outlet line 480. Wastewater generated during the filtration of the waste oil flows through the wastewater discharge line 470 to the wastewater tank 430. Optionally, in addition to providing lubricating oil for the rolling mill 600, the purified oil tank 210 can also be connected to an oil storage tank to store excess purified oil for reuse outside the system.

[0051] Furthermore, the filtration and purification device 420 includes a conical collection barrel, an oil suction filter, a filter pump, a glass fiber filter, a primary purification unit, a secondary purification unit, a water separator, and a pneumatic valve. The conical collection barrel uses sedimentation filtration to coarsely filter the waste oil, removing a large amount of water from the waste oil. An oil suction filter and a glass fiber filter are placed before and after the filter pump to remove impurities from the waste oil. Furthermore, the filters use a mesh size and filter paper. The primary and secondary purification units utilize oleophilic and hydrophobic filter cartridges to further separate the oil and water, producing purified oil that meets standards. Specifically, the preferred purification standard for waste rolling oil is a cleanliness level of at least 98%.

[0052] Optionally, the crude oil tank 110 is equipped with an agitator, a heater, a liquid level detection and alarm device, and a temperature detection and alarm device to ensure that the temperature of the rolling oil is within a set range. When the liquid level in the crude oil tank 110 drops below the minimum working liquid level, the on-site personnel are reminded to replenish the rolling oil. The purified oil tank 210 is equipped with an agitator, a heater, a liquid level detection and alarm device, and a temperature detection and alarm device to ensure that the temperature of the purified oil is within a set range. When the liquid level in the purified oil tank 210 increases to the working liquid level, the on-site personnel are reminded to switch the rolling oil supply to the purified oil supply, or transfer the purified oil to the oil storage barrel. The water supply tank 310 is equipped with a heater, a liquid level detection and alarm device, and a temperature detection and alarm device to ensure that the temperature of the cooling water in the water supply tank 310 is within a set range. At the same time, the refilling operation is performed when the liquid level in the water supply tank 310 drops below the minimum working liquid level.

[0053] Optional, such as Figure 4As shown, the oil injection control assembly 500 includes two sets of sequentially connected manual on / off valves 520, a liquid supply pump 530, a pressure gauge 540, and a check valve 550 to control the supply, on / off, and flow pressure of rolling oil or purified oil. The water injection control assembly 320 also includes two sets of sequentially connected manual on / off valves 520, a liquid supply pump 530, a pressure gauge 540, and a check valve 550 to control the supply, on / off, and flow pressure of cooling water. These two sets of manual on / off valves 520, liquid supply pump 530, pressure gauge 540, and check valve 550 prevent production interruptions caused by equipment failure. Furthermore, flow meters 700 are installed on the oil supply line 510 and the water supply line 350 to control the flow rate of rolling oil, purified oil, or cooling water.

[0054] In some embodiments of the present invention, the operation process of the oil and water supply system of a rolling mill provided by the present invention during initial startup is as follows:

[0055] S1: Before the rolling mill is started, the rolling oil supply unit 100 and the cooling water supply unit 300 are adjusted to a standby state.

[0056] S11: The internal circulation passage of the rolling oil supply unit 100 is opened.

[0057] S111: Ensure that the rolling oil in the crude oil tank 110 is above the minimum working liquid level;

[0058] Check the liquid level of the rolling oil stock solution in the crude oil tank 110. If the liquid level has not reached the minimum working liquid level, replenish the rolling oil stock solution.

[0059] S112: Turn on the agitator and heater in the crude oil tank 110 to ensure that the rolling oil is within a preset temperature range;

[0060] S113 : Open the first valve 120 , the second valve 130 and the oil injection control assembly 500 to allow the rolling oil to circulate in the crude oil tank 110 , the oil injection control assembly 500 , the oil supply pipeline 510 and the first oil return pipeline 140 .

[0061] S12: The internal circulation passage of the cooling water supply unit 300 is opened.

[0062] S121: Turn on the heater of the water supply tank 310 to ensure that the cooling water is within the set temperature;

[0063] S122: Close the fifth valve 330 and open the sixth valve 340;

[0064] S123 : Turn on the liquid supply pump of the water spray control assembly 320 to allow the cooling water to circulate in the water supply tank 310 , the water spray control assembly 320 , and the return water pipe 360 ​​.

[0065] S2: When the rolling mill is working, the waste liquid treatment unit 400 is started, and the rolling oil supply unit 100 and the cooling water supply unit 300 work alternately.

[0066] S21: When the rolling mill needs to be lubricated by oil spraying, the main oil supply control valve 511 on the oil supply pipeline 510 is opened to transport the rolling oil in the internal circulation to the spray beam 610.

[0067] S211: The main oil supply control valve 511 on the oil supply pipeline 510 is opened, and the fifth valve 330 on the water supply pipeline 350 is closed, and the cooling water maintains an internal circulation state;

[0068] S212: The seventh valve 450 is closed and the eighth valve 460 is opened to transport the waste oil in the collecting tray 630 at the bottom of the rolling mill 600 to the buffer oil tank 410 through the waste oil collecting pipeline 442;

[0069] S213: The waste oil enters the filtering and purifying device 420 from the buffer oil tank 410, and the purified waste oil is transported to the purified oil tank 210 for storage through the purified oil outlet pipe 480.

[0070] S22: When the rolling mill needs to be cooled by spraying water, the fifth valve 330 on the water supply pipeline 350 is opened to transport the cooling water in the internal circulation to the spray beam 610.

[0071] S221: The main oil supply control valve 511 on the oil supply pipeline 510 is closed, and the rolling oil resumes the internal circulation state;

[0072] S222 : The seventh valve 450 is opened and the eighth valve 460 is closed, so as to transport the wastewater in the collecting tray 630 at the bottom of the rolling mill 600 to the wastewater tank 430 through the wastewater collecting pipeline 441 and the wastewater discharge pipeline 470 .

[0073] S23: When the liquid level of the purified oil tank 210 reaches the working liquid level, it indicates that the purified oil is sufficient and can be put into use in the system.

[0074] S3: After the rolling mill stops, the rolling oil supply unit 100 and the cooling water supply unit 300 return to the standby state.

[0075] S31: After the rolling mill stops working, the main oil supply control valve 511 on the oil supply pipeline 510 is closed, the fifth valve 330 on the water supply pipeline 350 is closed, and the rolling oil and cooling water resume their respective internal circulation states.

[0076] After the supply system has been working for a period of time, the purified oil can be used as a backup for rolling oil. Step S24 is added to step S2:

[0077] S24: When the crude oil tank 110 needs to be replenished or replaced with oil, the rolling oil supply unit 100 exits the system and the purified oil supply unit 200 enters the system.

[0078] S241: The first valve 120 and the second valve 130 of the rolling oil supply unit 100 are closed, and the third valve 220 and the fourth valve 230 of the purified oil supply unit 200 are opened to open the purified oil supply passage and the internal circulation passage;

[0079] S242: The seventh valve 450 is closed and the eighth valve 460 is opened to transport the waste oil in the collecting tray 630 at the bottom of the rolling mill 600 to the buffer oil tank 410 through the waste oil collecting pipeline 442;

[0080] S243: The waste oil enters the filtering and purifying device 420 from the buffer oil tank 410, and the purified waste oil is transported to the purified oil tank 210 for storage.

[0081] Accordingly, after the rolling mill 600 stops working, step S32 is added to step S3:

[0082] S32: The main oil supply control valve 511 on the oil supply pipeline 510 is closed, and the fifth valve 330 on the water supply pipeline 350 is closed, and the purified oil and cooling water resume their respective internal circulation states.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. An oil and water supply system for a rolling mill, comprising a rolling oil supply unit (100) for supplying rolling oil to a spray beam (610), and a waste liquid treatment unit (400) for recovering and treating spray waste liquid, wherein the rolling oil supply unit (100) comprises an oil tank (110) for storing rolling oil, and the waste liquid treatment unit (400) comprises a wastewater discharge pipeline (470) and a purified oil outlet pipeline (480), characterized in that: It also includes a purified oil supply unit (200), and the waste liquid treatment unit (400) transports the purified oil to the purified oil tank (210) of the purified oil supply unit (200) through the purified oil outlet pipeline (480), wherein: The outlet of the purified oil tank (210) is connected to the first oil outlet pipeline (150) of the outlet of the crude oil tank (110) via the second oil outlet pipeline (250), and the first oil outlet pipeline (150) and the second oil outlet pipeline (250) merge to form an oil supply pipeline (510) extending to the spray beam (610); An oil injection control assembly (500) and an oil supply master control valve (511) are sequentially arranged on the oil supply pipeline (510) along the oil flow direction to control the oil injection process. A first oil return pipeline (140) connected to the oil tank (110) and a second oil return pipeline (240) connected to the purified oil tank (210) extend between the oil supply master control valve (511) and the oil injection control assembly (500). The apparatus further comprises a cooling water supply unit (300) for supplying cooling water to the spray beam (610). The cooling water supply unit (300) comprises a water supply tank (310) and a water supply pipeline (350). One end of the water supply pipeline (350) is connected to the outlet of the water supply tank (310) via a water spray control assembly (320), and the other end is connected to the spray beam (610). The water supply pipeline (350) is provided with a return water pipeline (360) for guiding the cooling water back to the water supply tank (310).

2. The system according to claim 1, wherein: A first valve (120) and a third valve (220) are respectively provided on the first oil outlet pipeline (150) and the second oil outlet pipeline (250) to switch the type of lubricating oil entering the oil supply pipeline (510).

3. The system according to claim 1 or 2, characterized in that: A second valve (130) and a fourth valve (230) are respectively provided on the first oil return pipeline (140) and the second oil return pipeline (240) to switch the type of lubricating oil flowing back to the crude oil tank (110) and the purified oil tank (210).

4. The system according to claim 1, wherein: The waste liquid treatment unit (400) comprises a waste liquid collection pipeline (440) and a buffer oil tank (410). One end of the waste liquid collection pipeline (440) is connected to a collection plate (630) at the bottom of the rolling mill (600), and the other end is split to form a waste water collection pipeline (441) connected to the waste water tank (430) and a waste oil collection pipeline (442) connected to the buffer oil tank (410).

5. The system according to claim 4, characterized in that: The wastewater collection pipeline (441) and the waste oil collection pipeline (442) are respectively provided with a seventh valve (450) and an eighth valve (460) to switch between different types of waste liquid processing channels.

6. The system according to claim 4, characterized in that: The outlet of the buffer oil tank (410) is connected to the filtering and purifying device (420), the purified oil outlet (422) of the filtering and purifying device (420) is connected to the purified oil tank (210) through the purified oil outlet pipeline (480), and the filtered water outlet (421) of the filtering and purifying device (420) merges with the wastewater collection pipeline (441) to form a wastewater discharge pipeline (470).

7. The system according to claim 1, wherein: The oil supply pipeline (510) and the water supply pipeline (350) are provided with flow meters (700) to control the flow of rolling oil, purified oil or cooling water.

8. The system according to claim 1, wherein: A plurality of spray heads (620) facing the rolling mill (600) are provided on the spray beam (610), and each spray head (620) is independently controlled by a solenoid valve.

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