Lubricating fluid test system for steel cord

Abstract

The utility model discloses a lubricating liquid test system for a steel cord, which comprises a circulating system, a machine liquid return box, a horizontal sedimentation tank, a primary liquid return circulating box, a vertical sedimentation tank, a secondary liquid return circulating box, a paper tape filter, a copper precipitator, a filtrate tank, a plate heat exchanger and a wet drawing machine, and the lubricating oil is tried by opening and closing different parts of the valve on the pipeline. The lubricating fluid of other brands can be tested, the test cost is reduced, if the test succeeds, the lubricating fluid with higher cost performance can be used, the production cost is reduced, and new equipment is not needed in the trial process.

Description

Technical Field

[0001] The utility model relates to the technology of selecting lubricating oil for steel cord, and particularly relates to a lubricating fluid test system for steel cord. Background Art

[0002] Steel cord is a strand or rope made of high-quality high-carbon steel with a brass coating on the surface and fine-gauge steel wires for special purposes. It is mainly used as the skeleton material for car tires, light truck tires, heavy-duty truck tires, engineering vehicle tires, aircraft tires, and other rubber products. The radial tires made with steel cord as the skeleton material have the advantages of long service life, puncture resistance, good elasticity, safety, and comfort, resulting in a sharp increase in the demand for radial tires in the automotive industry, which in turn promotes the development of the steel cord industry.

[0003] The production of steel cord is divided into several stages, including medium and large drawing, copper plating, and wet drawing. Among them, the wet drawing stage is the key process in the production of steel cord, and it requires a large amount of lubricating fluid to complete the drawing process in the wet drawing stage. The main functions of the lubricating fluid are cooling, reducing friction and wear, etc., preventing scratches and cracks on the surface of the steel cord to ensure the quality of the steel cord and improving its adhesion to rubber. However, there are many brands of lubricating fluids on the market currently, and the lubricating effects of the lubricating fluids produced by different manufacturers are not the same, resulting in different surface qualities of the steel cord and different adhesions to rubber. There are often defects such as dull surfaces of the steel cord, easy wire breakage and wire shrinkage during the drawing process.

[0004] Among the lubricating fluids on the market currently, there are relatively few lubricating fluids with relatively good comprehensive performance, and the prices are relatively high. Although the prices of other lubricating fluids are low, there may be problems such as poor lubricity and extreme pressure anti-wear performance, high wire breakage rate, low and unstable adhesion between the drawn steel wire and rubber. And the lubricating systems of steel cord manufacturers are basically large-scale lubricating systems for production, and the cost for manufacturers to try other lubricating fluids will be relatively high. Therefore, steel cord manufacturers rarely change the brand of lubricating fluid, which in turn leads to the inability to effectively verify newly developed lubricating fluids.

[0005] To solve the above problems, the utility model proposes a lubricating system for steel cord test, which can test other lubricating fluids, reduce the test cost. If the test is successful, a lubricating fluid with higher cost performance can be used to reduce the production cost. At the same time, it can also effectively test newly developed lubricating fluids and promote the development of lubricating fluids. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, the utility model proposes a lubricating fluid test system for steel cord, which can test lubricating fluids of other brands with low test cost. If the test is successful, a lubricating fluid with higher cost performance can be used to reduce the production cost, and no new equipment needs to be invested during the trial process.

[0007] The technical solution adopted by the utility model is as follows: a lubricating fluid test system for steel cord, including a circulation system. The circulation system includes a machine liquid return tank, a horizontal sedimentation tank, a primary liquid return circulation tank, a vertical sedimentation tank, a secondary liquid return circulation tank, a paper tape filter, a copper sedimentator, a filtrate tank, a plate heat exchanger, and a wet drawing machine. The machine liquid return tank is connected to the horizontal sedimentation tank through a first pipeline, and a first valve is installed on the first pipeline. The high-level overflow port on the horizontal sedimentation tank is connected to the primary liquid return circulation tank through a second pipeline, and a second valve is installed on the second pipeline. The primary liquid return circulation tank is connected to the vertical sedimentation tank through a third pipeline, and a third valve is installed on the third pipeline. The high-level overflow port of the vertical sedimentation tank is connected to the secondary liquid return circulation tank through a fourth pipeline, and a fourth valve is installed on the fourth pipeline. The secondary liquid return circulation tank is connected to the plate heat exchanger through a fifth pipeline, and a fifth valve is installed on the fifth pipeline. The plate heat exchanger is connected to the wet drawing machine through a liquid supply main pipeline, and the wet drawing machine is connected to the machine liquid return tank through a liquid return main pipeline. The primary liquid return circulation tank is connected to the copper sedimentator through a sixth pipeline, and a sixth valve is installed on the sixth pipeline. The high-level overflow port of the vertical sedimentation tank is connected to the paper tape filter through a seventh pipeline, and a seventh valve is installed on the seventh pipeline. The paper tape filter and the copper sedimentator are connected to the filtrate tank through an eighth pipeline and a ninth pipeline, and corresponding eighth valves and ninth valves are installed on the eighth pipeline and the ninth pipeline. The filtrate tank is connected to the plate heat exchanger through a tenth pipeline, and a tenth valve is installed on the tenth pipeline.

[0008] On the basis of the above solution, as a preference, the primary liquid return circulation tank and the plate heat exchanger are connected through an eleventh pipeline, and an eleventh valve is installed on the eleventh pipeline. The primary liquid return circulation tank and the copper sedimentator are connected through a twelfth pipeline, and a twelfth valve is installed on the twelfth pipeline. A liquid level balance port is provided between the primary liquid return circulation tank and the secondary liquid return circulation tank.

[0009] On the basis of the above solution, as a preference, the machine liquid return tank and the vertical sedimentation tank are connected through a thirteenth pipeline, and a thirteenth valve is installed on the thirteenth pipeline. The vertical sedimentation tank and the copper sedimentator are connected through a fourteenth pipeline, and a fourteenth valve is installed on the fourteenth pipeline.

[0010] On the basis of the above solution, as a preference, the horizontal sedimentation tank and the copper sedimentator are connected to a waste liquid tank through a fifteenth pipeline and a sixteenth pipeline.

[0011] On the basis of the above solution, as a preference, the secondary liquid return circulation tank is connected to a new liquid system. The new liquid system includes a new liquid preparation tank, a new liquid storage tank, and a new liquid metering tank. The new liquid preparation tank is connected to the new liquid storage tank through a new liquid pump. The new liquid storage tank is connected to the new liquid metering tank, and the new liquid metering tank is connected to the secondary liquid return circulation tank.

[0012] On the basis of the above solution, as a preference, liquid level sensors are arranged in the new liquid preparation tank and the new liquid storage tank, and the liquid level sensors are electrically connected to the new liquid pump.

[0013] On the basis of the above solution, preferably, a new liquid outlet is provided at the bottom of the new liquid storage tank, and the height of the new liquid outlet is higher than the new liquid inlet on the new liquid metering tank.

[0014] On the basis of the above scheme, as a preferred embodiment, a pressure relief valve is provided at the end of the liquid supply main pipe, and the end of the pressure relief valve pipeline is connected to the liquid return main pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model can test other brands of lubricating fluids to reduce the test cost. If the test is successful, a more cost-effective lubricating fluid can be used to reduce production costs. The utility model can realize three operation modes: horizontal sedimentation tank + vertical sedimentation tank, horizontal sedimentation tank or vertical sedimentation tank. The precipitation effect of impurities and particles such as copper powder in the lubricating fluid can be tested to determine the precipitation scheme with the best precipitation effect and the lowest cost.

[0017] 2. The waste liquid discharge pipe of the horizontal sedimentation tank has a slope of 0.1% to 0.5%, which reduces the maintenance cost of pipe blockage in the later stage;

[0018] 3. The waste liquid discharge pipe of the copper precipitator is directly introduced into the ditch, which can avoid the blockage of the pipe due to excessive length, and at the same time reduce the investment cost of the waste liquid discharge of the copper precipitator;

[0019] 4. A liquid level balance port is provided between the primary liquid return circulation tank and the secondary liquid return circulation tank to avoid the situation where the liquid levels of the two circulation tanks are unbalanced;

[0020] 5. A pressure relief valve is installed at the end of the liquid supply main pipe to prevent the lubricating liquid from overflowing or splashing from the wet drawing machine due to excessive flow and velocity of the lubricating liquid. At the same time, the end of the pressure relief valve pipeline is connected to the liquid return main pipe to speed up the liquid return speed and avoid the lubricating liquid overflowing from the wet drawing machine due to too slow return flow rate.

[0021] 6. When the horizontal sedimentation tank + vertical sedimentation tank is used, the liquid inlet pipe of the paper belt filter is connected to the overflow port of the vertical sedimentation tank. Because the lubricating liquid has been precipitated twice, the use time of the filter paper of the paper belt filter can be reduced, the use of the filter paper cost can be reduced, and the cost can be reduced;

[0022] 7. The outlet of the horizontal sedimentation tank adopts a high-level overflow port, which improves the separation effect of lubricating liquid from impurities and copper powder and other particles;

[0023] 8. The horizontal sedimentation tank is equipped with a sedimentation optimization zone. When the sedimentation effect of the lubricating fluid in the horizontal sedimentation is not good, stainless steel can be inserted into the Y-shaped bayonet to form an isolation zone that can block impurities and particles such as copper powder from continuing to flow to the outlet, thereby further improving the separation effect of the lubricating fluid from impurities and particles such as copper powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the flow chart of the present utility model.

[0025] Figure 2 is the flow chart of the horizontal sedimentation tank + vertical sedimentation tank operation system;

[0026] Figure 3 is the flow chart of the horizontal sedimentation tank operation system;

[0027] Figure 4 is the flow chart of the vertical sedimentation tank operation system. Detailed implementation manners

[0028] The present utility model will be further described below through embodiments, but the scope of the present utility model is not limited thereto.

[0029] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and / or combinations thereof.

[0030] Such as Figures 1-4As shown in the figure, a lubricating fluid test system for steel cord includes a circulation system. The circulation system includes a machine liquid return tank 1, a horizontal sedimentation tank 2, a primary liquid return circulation tank 3, a vertical sedimentation tank 4, a secondary liquid return circulation tank 5, a paper tape filter 6, a copper precipitator 7, a filtrate tank 8, a plate heat exchanger 9, and a wet drawing machine 10. The machine liquid return tank is connected to the horizontal sedimentation tank through a first pipeline 11, and a first valve 12 is installed on the first pipeline. The high-level overflow port on the horizontal sedimentation tank is connected to the primary liquid return circulation tank through a second pipeline 13, and a second valve 14 is installed on the second pipeline. The primary liquid return circulation tank is connected to the vertical sedimentation tank through a third pipeline 15, and a third valve 16 is installed on the third pipeline. The high-level overflow port of the vertical sedimentation tank is connected to the secondary liquid return circulation tank through a fourth pipeline 17, and a fourth valve 18 is installed on the fourth pipeline. The secondary liquid return circulation tank is connected to the plate heat exchanger through a fifth pipeline 19, and a fifth valve 20 is installed on the fifth pipeline. The plate heat exchanger is connected to the wet drawing machine through a liquid supply main pipe 21, and the wet drawing machine is connected to the machine liquid return tank through a liquid return main pipe 22. The primary liquid return circulation tank is connected to the copper precipitator through a sixth pipeline 23, and a sixth valve 24 is installed on the sixth pipeline. The high-level overflow port of the vertical sedimentation tank is connected to the paper tape filter through a seventh pipeline 25, and a seventh valve 26 is installed on the seventh pipeline. The paper tape filter and the copper precipitator are connected to the filtrate tank through an eighth pipeline 27 and a ninth pipeline 28, and corresponding eighth valves 29 and ninth valves 30 are installed on the eighth pipeline and the ninth pipeline. The filtrate tank is connected to the plate heat exchanger through a tenth pipeline 31, and a tenth valve 32 is installed on the tenth pipeline. There is a liquid level balance port between the primary liquid return circulation tank and the plate heat exchanger. The machine liquid return tank and the vertical sedimentation tank are connected through a thirteenth pipeline 37, and a thirteenth valve 38 is installed on the thirteenth pipeline. The vertical sedimentation tank and the copper precipitator are connected through a fourteenth pipeline 39, and a fourteenth valve 40 is installed on the fourteenth pipeline;

[0031] During use, the horizontal sedimentation tank + vertical sedimentation tank operation system can be formed by closing the eleventh to fourteenth valves and the liquid level balance port in the circulation system, or the horizontal sedimentation tank operation system can be formed by closing the third, fourth, fifth, seventh, thirteenth, and fourteenth valves in the circulation system, or the vertical sedimentation tank operation system can be formed by closing the first, second, third, sixth, eleventh, twelfth, and liquid level balance port in the circulation system.

[0032] Among them, the horizontal sedimentation tank and the copper precipitator are connected to a waste liquid tank 41 through a fifteenth pipeline and a sixteenth pipeline.

[0033] The secondary liquid return circulation box is connected to the new liquid system for regularly adding new lubricating liquid into it. The new liquid system includes a new liquid preparation tank, a new liquid storage tank, and a new liquid metering tank. The new liquid preparation tank is used to prepare new lubricating liquid, and the new lubricating liquid is sent to the new liquid storage tank through a new liquid pump. The new lubricating liquid in the new liquid storage tank is sent to the new liquid metering tank through the liquid level difference. The new liquid metering tank is connected to the secondary liquid return circulation box to regularly add new lubricating liquid to the secondary liquid return circulation box.

[0034] When the liquid level in the new liquid preparation tank is too low or the liquid level in the new liquid storage tank is too high, the new liquid pump will stop working. A new liquid outlet is set at the bottom of the new liquid storage tank, and the new liquid is sent to the new liquid metering tank through the liquid level difference.

[0035] A pressure relief valve 42 is provided at the end of the liquid supply main pipe, and the end of the pressure relief valve pipeline is connected to the liquid return main pipe to prevent the lubricating liquid from overflowing or splashing from the wet drawing machine due to excessive lubricating liquid flow and flow rate. The end of the pressure relief valve pipeline is connected to the liquid return main pipe to speed up the liquid return speed and avoid the lubricating liquid overflowing from the wet drawing machine due to too slow return liquid flow rate.

[0036] There are two horizontal sedimentation tanks, one for backup and the other for use. The valve outside the drainage hopper of the operating horizontal sedimentation tank is opened, and the valve outside the backup one is closed. The scraper blade will periodically scrape the impurities and copper powder and other particles deposited in the horizontal sedimentation tank to the drainage hopper. The pneumatic valve above the waste liquid metering tank will then open, and the waste lubricating fluid containing impurities and copper powder and other particles will be discharged into the waste liquid metering tank through the waste liquid pipe. A liquid level sensor is set above the waste liquid metering tank. When the waste liquid reaches the position of the liquid level sensor, the pneumatic valve outside the drainage hopper and the pneumatic valve above the waste liquid metering tank are closed, and the pneumatic valve below the waste liquid metering tank is opened to discharge the waste lubricating fluid into the waste liquid tank. The waste liquid of the vertical sedimentation tank is sent to the waste liquid treatment station through the waste liquid delivery pump of the vertical sedimentation tank at the bottom. The waste liquid of the copper precipitator is directly discharged into the ditch through the copper precipitator sewage pipe at the bottom, and the waste liquid is sent to the waste liquid tank through the ditch.

[0037] According to the process requirements, the utility model can realize three operation modes, namely, a horizontal sedimentation tank + vertical sedimentation tank operation system, a horizontal sedimentation tank operation system, and a vertical operation system.

[0038] In the horizontal sedimentation tank + vertical sedimentation tank operation system, such as Figure 2As shown, the machine return liquid tank transfer pump sends the lubricating liquid into the horizontal sedimentation tank. After the lubricating liquid in the horizontal sedimentation tank is separated from impurities, copper powder and other particles, the lubricating liquid is sent into the primary return liquid circulation tank through the high-level overflow port of the horizontal sedimentation tank. The primary return liquid circulation tank transfer pump sends the lubricating liquid into the vertical sedimentation tank and the copper precipitator. After the lubricating liquid in the vertical sedimentation tank is further separated from impurities, copper powder and other particles, it flows into the secondary return liquid circulation tank and the paper tape filter through the high-level overflow port. The lubricating liquid sent into the paper tape filter is directly discharged into the filtrate tank after filtration. The lubricating liquid sent into the copper precipitator is directly discharged into the filtrate tank after copper removal. The lubricating liquid in the filtrate tank is sent into the secondary return liquid circulation tank through the filtrate pump. The secondary return liquid circulation tank transfer pump sends the lubricating liquid into the plate heat exchanger for cooling. The cooled lubricating liquid is sent into the wet drawing machines respectively through the supply main pipe. The lubricating liquid in the wet drawing machines flows into their respective branch pipelines through the overflow ports of the wet drawing machines respectively. Each branch pipeline flows into the return main pipe, and the lubricating liquid is sent into the machine return liquid tank through the return main pipe, forming the circulation of the entire lubrication system. The new liquid system adds new lubricating liquid to the secondary return liquid circulation tank regularly according to the various indexes of the lubricating liquid. The waste liquid discharge system discharges part of the lubricating liquid into the waste liquid tank regularly and quantitatively according to the various indexes of the lubricating liquid, ensuring that all the indexes of the lubricating liquid are within the best range to ensure the continuous operation of the horizontal sedimentation tank + vertical sedimentation tank operation system.

[0039] In the horizontal sedimentation tank operation system, as Figure 3 As shown, the machine return liquid tank transfer pump sends the lubricating liquid into the horizontal sedimentation tank. After the lubricating liquid in the horizontal sedimentation tank is separated from impurities, copper powder and other particles, the lubricating liquid is sent into the primary return liquid circulation tank through the high-level overflow port of the horizontal sedimentation tank. The primary return liquid circulation tank transfer pump sends the lubricating liquid into the copper precipitator, the paper tape filter and the plate heat exchanger. The lubricating liquid entering the copper precipitator and the paper tape filter flows into the filtrate tank after filtration. The filtrate transfer pump sends the lubricating liquid in the filtrate tank into the secondary return liquid circulation tank. The secondary return liquid circulation tank sends the lubricating liquid into the primary return liquid circulation tank through the liquid level balance port between the primary return liquid circulation tank and the secondary return liquid circulation tank. The lubricating liquid sent into the plate heat exchanger is sent into the supply main pipe after cooling. The lubricating liquid is sent into the wet drawing machines respectively through the supply main pipe. The lubricating liquid in the wet drawing machines flows into their respective branch pipelines through the overflow ports of the wet drawing machines respectively. Each branch pipeline flows into the return main pipe, and the lubricating liquid is sent into the machine return liquid tank through the return main pipe, forming the circulation of the entire lubrication system. The new liquid system adds new lubricating liquid to the secondary return liquid circulation tank regularly according to the various indexes of the lubricating liquid. The waste liquid discharge system discharges part of the lubricating liquid into the waste liquid tank regularly and quantitatively according to the various indexes of the lubricating liquid, ensuring that all the indexes of the lubricating liquid are within the best range to ensure the continuous operation of the horizontal sedimentation tank + vertical sedimentation tank operation system.

[0040] In the vertical sedimentation tank operation system, as Figure 4As shown in the figure, the machine return liquid tank pump directly sends the lubricating liquid into the vertical sedimentation tank. After the lubricating liquid in the vertical sedimentation tank is separated from impurities, copper powder and other particles, it flows into the secondary return liquid circulation tank, paper tape filter and copper precipitator through the high-level overflow port of the vertical sedimentation tank. The lubricating liquid in the paper tape filter and copper precipitator flows into the filtrate tank after further filtration. The filtrate pump sends the lubricating liquid in the filtrate tank into the secondary return liquid circulation tank. The secondary return liquid circulation tank sends the lubricating liquid into the plate heat exchanger for cooling. The cooled lubricating liquid is sent into the wet drawing machine through the supply main pipe respectively. The lubricating liquid in the wet drawing machine flows into their respective branch pipelines through their respective overflow ports. Each branch pipeline flows into the return liquid main pipe with a slope of 0.3%, and the lubricating liquid is sent into the machine return liquid tank through the return liquid main pipe, forming the circulation of the entire lubrication system. The new liquid system adds new lubricating liquid to the secondary return liquid circulation tank regularly according to the various indicators of the lubricating liquid. The waste liquid discharge system discharges part of the lubricating liquid into the waste liquid tank regularly and quantitatively according to the various indicators of the lubricating liquid to ensure that all indicators of the lubricating liquid are within the best range, so as to ensure the continuous operation of the horizontal sedimentation tank + vertical sedimentation tank operation system.

[0041] In the technical solution of the present application, the horizontal sedimentation tank is divided into a liquid inlet buffer zone, an impurity and copper powder and other particle sedimentation zone, and a sedimentation optimization zone.

[0042] In the sedimentation optimization zone, Y-shaped buckles are provided on both sides of the pool wall. When the sedimentation effect of the lubricating liquid in the horizontal sedimentation is not good, the stainless steel is inserted into the Y-shaped buckle to form an isolation zone that can prevent impurities, copper powder and other particles from continuing to flow towards the liquid outlet.

[0043] There are two horizontal sedimentation tanks, one for standby and the other for use. The standby tank is used as a temporary liquid storage tank when cleaning the equipment.

[0044] The inlet pipe of the vertical sedimentation tank is arranged in the middle and lower part of the tank body, and a buffer device is provided at the end of the inlet pipe.

[0045] The waste liquid discharge pipe of the horizontal sedimentation tank has a slope of 0.1% - 0.5% and flows towards the waste liquid metering tank.

[0046] The lubricating liquid in the wet drawing machine flows towards the return liquid main pipe with a slope of 0.3% through the overflow port.

[0047] It should be noted that the above-described embodiments are only used to explain the present utility model and do not constitute any limitation to the present utility model. The present utility model has been described by referring to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present utility model within the scope of the claims of the present utility model as provided, and revisions can be made to the present utility model without departing from the scope and spirit of the present utility model. Although the present utility model described therein relates to specific methods, materials and embodiments, it does not mean that the present utility model is limited to the specific examples disclosed therein. On the contrary, the present utility model can be extended to all other methods and applications with the same functions.

Claims

1. A lubricating fluid testing system for steel cord, characterized in that: The circulation system includes a machine liquid return tank, a horizontal sedimentation tank, a primary liquid return circulation tank, a vertical sedimentation tank, a secondary liquid return circulation tank, a paper tape filter, a copper sedimentator, a filtrate tank, a plate heat exchanger, and a wet puller. The machine liquid return tank is connected to the horizontal sedimentation tank through a first pipeline, a first valve is installed on the first pipeline, a high-level overflow port on the horizontal sedimentation tank is connected to a primary liquid return circulation tank through a second pipeline, a second valve is installed on the second pipeline, the primary liquid return circulation tank is connected to the vertical sedimentation tank through a third pipeline, a third valve is installed on the third pipeline, a high-level overflow port of the vertical sedimentation tank is connected to the secondary liquid return circulation tank through a fourth pipeline, and a fourth valve is installed on the fourth pipeline The secondary liquid return circulation box is connected to the plate heat exchanger through the fifth pipeline, and the fifth valve is installed on the fifth pipeline. The plate heat exchanger is connected to the wet pulling machine through the liquid supply main pipe, and the wet pulling machine is connected to the machine liquid return tank through the liquid return main pipe. The primary liquid return circulation box is connected to the copper precipitator through the sixth pipeline, and the sixth valve is installed on the sixth pipeline. The high-level overflow port of the vertical sedimentation tank is connected to the paper tape filter through the seventh pipeline, and the seventh valve is installed on the seventh pipeline. The paper tape filter and the copper precipitator are connected to the filtrate tank through the eighth pipeline and the ninth pipeline, and the corresponding eighth valve and ninth valve are installed on the eighth pipeline and the ninth pipeline. The filtrate tank is connected to the plate heat exchanger through the tenth pipeline, and the tenth valve is installed on the tenth pipeline.

2. The lubricating fluid testing system for steel cord according to claim 1, characterized in that: The primary liquid return circulation box and the plate heat exchanger are connected through the eleventh pipeline, and the eleventh valve is installed on the eleventh pipeline. The primary liquid return circulation box and the copper precipitator are connected through the twelfth pipeline, and the twelfth valve is installed on the twelfth pipeline. A liquid level balance port is provided between the primary liquid return circulation box and the secondary liquid return circulation box.

3. The lubricating fluid testing system for steel cord according to claim 1 or 2, characterized in that: The machine liquid return tank and the vertical sedimentation tank are connected through the thirteenth pipeline, the thirteenth valve is installed on the thirteenth pipeline, the vertical sedimentation tank and the copper sedimentator are connected through the fourteenth pipeline, and the fourteenth valve is installed on the fourteenth pipeline.

4. The lubricating fluid testing system for steel cord according to claim 1, characterized in that: The horizontal sedimentation tank and the copper sedimentator are connected to the waste liquid tank through the fifteenth pipeline and the sixteenth pipeline.

5. The lubricating fluid testing system for steel cord according to claim 1, characterized in that: The secondary liquid return circulation box is connected to the new liquid system. The new liquid system includes a new liquid preparation tank, a new liquid storage tank, and a new liquid metering tank. The new liquid preparation tank is connected to the new liquid storage tank through a new liquid pump. The new liquid storage tank is connected to the new liquid metering tank. The new liquid metering tank is connected to the secondary liquid return circulation box.

6. The lubricating fluid testing system for steel cord according to claim 5, characterized in that: Liquid level sensors are arranged in the new liquid preparation tank and the new liquid storage tank, and the liquid level sensors are electrically connected to the new liquid pump.

7. The lubricating fluid testing system for steel cord according to claim 1, characterized in that: A new liquid outlet is arranged at the bottom of the new liquid storage tank, and the height of the new liquid outlet is higher than the new liquid inlet on the new liquid metering tank.

8. The lubricating fluid testing system for steel cord according to claim 1, characterized in that: A pressure relief valve is installed at the end of the liquid supply main pipe, and the end of the pressure relief valve pipeline is connected to the liquid return main pipe.

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