Cutting fluid automatic filling system and cutting fluid concentration reproportioning method

Abstract

The invention discloses an automatic cutting fluid filling system and a cutting fluid concentration reproportioning method. The automatic cutting fluid filling system comprises a stock solution tank and a water tank, outlets of the water tank and the stock solution tank are connected with a proportioner, an outlet of the proportioner is connected with a proportioning tank, a stirrer is arranged in the proportioning tank, an outlet of the proportioning tank is connected with a fluid supply tank, and an outlet of the fluid supply tank is connected with a fluid supply pipe. The liquid supply pipe is composed of a main pipe and a plurality of branch pipes, an inlet of the main pipe is connected with an outlet of the liquid supply tank through valves, inlet ends of the branch pipes are connected with the main pipe, outlets are inserted into the liquid supply tank, and valves are arranged at outlets of the branch pipes; a terminal liquid level sensor is arranged in the liquid supply tank; an inlet of the temporary storage box is communicated with the liquid supply box; the temporary storage box is connected with the main pipe through a liquid return pipe, and a liquid return pump is arranged on the liquid return pipe; an outlet of the temporary storage box is communicated with the proportioning box. By means of the technical scheme, re-proportioning of the concentration of the cutting fluid is achieved, and waste of the prepared cutting fluid is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cutting fluid preparation, in particular to an automatic cutting fluid filling system and a cutting fluid concentration re-proportioning method. Background Art

[0002] During machining, friction between the tool and the workpiece, as well as plastic deformation of the workpiece, generates a significant amount of heat. If this heat is not effectively dissipated, it can not only lead to tool overheating, accelerated wear, and reduced tool life, but can also cause surface oxidation and dimensional deformation of the workpiece, reducing machining accuracy and surface quality. To address these issues, cutting fluid injection is often used in actual production. This fluid removes heat and forms a lubricating film at the contact point between the tool and the workpiece, reducing the coefficient of friction, thereby reducing heat generation and extending tool life.

[0003] Traditional cutting fluid replenishment relies primarily on manual labor. Based on experience and measuring tools, workers must mix the stock cutting fluid with water in a set ratio, manually add the mixture to the machine tool's cutting fluid tank, and regularly check the fluid level and concentration, repeatedly replenishing or replacing the fluid. With the advancement of CNC machine tool configuration, some machines are now equipped with automatic fluid dispensing devices. These devices, located inside or next to the machine, automatically mix the stock fluid and water to a preset concentration and monitor the fluid level and concentration in real time, reducing manual intervention and improving both the accuracy of the mix and the timeliness of replenishment.

[0004] However, in large-scale machining plants, dozens, hundreds, or even thousands of machine tools are operating simultaneously. Relying on each machine to configure and add cutting fluid individually would not only incur high labor costs, but could also easily lead to mismatching due to improper operation, resulting in wasted cutting fluid and fluctuating machining quality. To address this, the industry generally adopts a centralized fluid supply system: this system automatically mixes cutting fluid and water in a fixed ratio in a centralized tank farm, then delivers it to each machine tool through a pipeline network. This not only reduces the frequency of on-site operations, but also ensures stable cutting fluid concentration through centralized monitoring, improving production continuity and management efficiency.

[0005] A drawback of existing technologies is that when the cutting fluid concentration needs to be changed due to changes in machining batches, adjustments to cutting parameters, or changes in workpiece materials, the existing centralized fluid supply system can only empty the tanks and pipelines of the original cutting fluid concentration and then re-dispense and distribute it at the new target concentration. This operation is time-consuming and results in the direct discharge of large amounts of raw fluid and emulsion. This waste problem is particularly serious in high-capacity environments, not only increasing operating costs but also exacerbating the burden on the environment. Summary of the Invention

[0006] In response to the above-mentioned deficiencies or defects in the prior art, the present invention provides an automatic cutting fluid filling system, which can re-mix the concentration of the cutting fluid that has been proportioned, and at the same time can re-draw the cutting fluid that has been distributed to the fluid supply tank and re-proportion it, thereby avoiding waste of cutting fluid.

[0007] To achieve the above-mentioned object, the present invention provides, in a first aspect, an automatic cutting fluid filling system, comprising a raw liquid tank for storing raw cutting fluid and a water tank for storing water; the outlets of the water tank and the raw liquid tank are connected to a proportioner; the outlet of the proportioner is connected to a proportioning box; an agitator is provided in the proportioning box, the outlet of the proportioning box is connected to a liquid supply tank, and the outlet of the liquid supply tank is connected to a liquid supply pipe;

[0008] The liquid supply pipe consists of a main pipe and multiple branch pipes. The inlet of the main pipe is connected to the outlet of the liquid supply tank through a valve. The inlet end of the branch pipe is connected to the main pipe, and the outlet is inserted into the liquid supply tank. A valve is provided at the outlet of the branch pipe.

[0009] The liquid supply tank is set at the liquid-using equipment, and a terminal liquid level sensor is installed inside it;

[0010] The automatic filling system also includes a temporary storage box, the inlet of which is connected to the liquid supply box and can transfer the cutting fluid in the liquid supply box to the temporary storage box; the temporary storage box is connected to the main pipe through a return pipe; a return pump is provided on the return pipe to pump the cutting fluid in the liquid supply pipe and / or liquid supply tank back to the temporary storage box; the outlet of the temporary storage box is connected to the proportioning box.

[0011] Furthermore, the raw liquid tank is directly connected to the proportioning tank through a raw liquid bypass pipe; and the water tank is directly connected to the proportioning tank through a water bypass pipe.

[0012] Furthermore, a water pump, a flow meter and a flow control valve are provided on the pipeline from the water tank outlet to the proportioner inlet; a raw liquid pump, a flow meter and a flow control valve are provided on the pipeline from the raw liquid tank outlet to the proportioner inlet.

[0013] The proportioning box is provided with a concentration detector for real-time monitoring of the proportioning concentration.

[0014] When the cutting fluid concentration is higher than the set value, increase the water supply flow rate and / or reduce the raw fluid supply flow rate.

[0015] When the cutting fluid concentration is lower than the set value, reduce the water supply flow rate and / or increase the raw fluid supply flow rate.

[0016] Furthermore, a detection pipeline is vertically arranged on the outer wall of the proportioning box, and the concentration detector is arranged in the middle of the detection pipeline.

[0017] The upper and lower ends of the detection pipeline are respectively connected to the interior of the proportioning box. A pump and a one-way valve are arranged on the detection pipeline. The one-way valve is arranged at the bottom of the detection pipeline and only allows liquid to move from bottom to top.

[0018] Furthermore, a drain port is provided at the bottom of the liquid supply tank, and the drain port is connected to a cutting fluid waste recovery system.

[0019] In some embodiments, the agitator in the proportioning tank is an aeration agitator.

[0020] At the same time, the present invention also proposes a cutting fluid concentration re-proportioning method using the cutting fluid automatic filling system, the method comprising the following steps:

[0021] a. Transfer the remaining old cutting fluid in the fluid supply tank to the temporary storage tank;

[0022] b. Start the liquid return pump to extract the old cutting fluid in the liquid supply pipe and liquid supply tank and pump it to the temporary storage tank;

[0023] c. Transfer some of the old cutting fluid in the temporary storage box to the proportioning box;

[0024] d. Set the new cutting fluid concentration and compare it with the old cutting fluid concentration; when the new set concentration is greater than the old concentration, inject the cutting fluid from the original liquid tank into the proportioning tank until the new set concentration is reached; when the new set concentration is less than the old concentration, inject water from the water tank into the proportioning tank until the new set concentration is reached;

[0025] e. Transfer the new cutting fluid in the proportioning box to the fluid supply box, and the fluid supply box supplies the new cutting fluid to the fluid supply tank through the fluid supply pipe;

[0026] Repeat steps ce until all the old cutting fluid in the temporary storage tank is reconfigured with new cutting fluid.

[0027] In some embodiments, step b comprises:

[0028] b-1. Before starting the liquid return pump, close the valve at the main inlet;

[0029] b-2. After starting the liquid return pump, when the liquid level in any liquid supply tank is lower than the set liquid return level, the valve on the branch pipe connected to the liquid supply tank is closed;

[0030] b-3. When all valves on the branch pipes are closed, the return liquid pump will be closed with a delay.

[0031] In some embodiments, when there is a drain port, after the valve of the branch pipe connected to the liquid supply tank is closed, the drain port of the liquid supply tank is opened to drain the remaining cutting fluid, and the drain port is closed before step e.

[0032] The automatic cutting fluid filling system of the present invention has the following effects:

[0033] In existing centralized fluid supply systems, every time the cutting fluid concentration is changed, the old fluid in the storage tanks, pipelines, and cutting fluid tanks of each machine tool must be completely drained, resulting in a large amount of cutting fluid waste. The technical solution of the present invention centralizes the proportioning process in the proportioning box. The liquid supply box is only responsible for storing the prepared cutting fluid and supplying it to the liquid-consuming equipment. At the same time, a new "temporary storage box + liquid return pump" recovery subsystem is added. The cutting fluid can be withdrawn from the liquid supply box or pipeline to the temporary storage box, and then transported to the proportioning box for re-mixing. Concentration adjustment can be completed without emptying the entire system, significantly reducing the waste of emulsion and raw liquid, and lowering operating costs.

[0034] Traditional systems often require a complete "drain, remix, and replenish" process to change cutting fluid concentration, resulting in a long cycle and downtime, which reduces production efficiency. The present invention uses a return pump to pump residual liquid in the pipeline and supply tank directly to a temporary storage tank. The temporary storage tank is connected to the proportioning tank, allowing for rapid recovery and re-mixing of old cutting fluid, thus reducing downtime.

[0035] Traditional centralized fluid supply generates a large amount of waste fluid, which puts pressure on waste fluid recovery and treatment. This invention recycles old cutting fluid in a temporary storage tank and re-provisions it in a proportioning tank, achieving closed-loop utilization and effectively reducing waste fluid emissions.

[0036] The cutting fluid concentration re-proportioning method of the cutting fluid automatic filling system of the present invention has the following effects:

[0037] Traditional fluid supply systems require draining the tank and pipes, then cleaning and re-provisioning the cutting fluid concentration when changing the cutting fluid concentration. This is a cumbersome and wasteful process. The method of the present invention utilizes a closed-loop process of "recovering old cutting fluid → re-provisioning → supplying new cutting fluid," eliminating the need for draining and enabling continuous fluid supply at the desired concentration.

[0038] During the re-proportioning process, a portion of the old cutting fluid can be extracted for re-provisioning. Once this portion reaches the target concentration, it is immediately returned to the fluid supply tank and supplied to the machine tool. When switching between the old and new cutting fluids, the new and old cutting fluids do not need to be fully re-provisioned; they can be put into use in batches, significantly shortening the switching time and improving production continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 This is a schematic diagram of the cutting fluid automatic filling system of the present invention. The blue arrow in the figure indicates the liquid flow direction under normal liquid supply status, and the red arrow indicates the liquid flow direction during re-proportioning.

[0041] Description of Reference Numerals

[0042] 1-raw liquid tank, 1a-raw liquid bypass pipe; 2-water tank, 2a-water bypass pipe; 3-proportioner; 4-proportioning box; 5-liquid supply tank; 6-liquid supply pipe, 6a-main pipe, 6b-branch pipe; 7-liquid supply tank; 8-temporary storage tank; 9-return liquid pipe; 10-return liquid pump; 11-concentration detector; 12-detection pipeline. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] The present invention provides a cutting fluid automatic filling system, such as Figure 1 As shown, the system includes a raw liquid tank 1, a water tank 2, a proportioner 3, a proportioning box 4, a liquid supply box 5, a liquid supply pipe 6, a liquid supply tank 7, a temporary storage box 8 and other structures.

[0046] The raw liquid tank 1 is used to store raw cutting fluid. A liquid inlet pump is provided at the inlet of the raw liquid tank 1, which draws raw cutting fluid from the barrel of the raw cutting fluid through the liquid inlet pump pipeline and stores it in the raw liquid tank 1. A raw liquid pump is provided at the outlet of the raw liquid tank 1, and the raw liquid pump is connected to the proportioner 3 and the proportioning tank 4 through pipelines. The raw liquid pump is used to pump the raw cutting fluid in the raw liquid tank 1 to the proportioner 3 or the proportioning tank 4. Flow meters and flow control valves are required on the pipelines from the raw liquid pump to the proportioner 3 and the proportioning tank 4. The flow control valves on the pipelines are used to control whether the raw cutting fluid is pumped to the proportioner 3 or the proportioning tank 4.

[0047] A liquid level sensor is provided in the raw liquid tank 1, which will sound an alarm when the liquid level is insufficient to remind the staff to replenish the cutting fluid raw liquid.

[0048] Water tank 2 is used to store clean water. Can be pressurized or open in water tank 2.

[0049] The pressurized water tank 2 is directly connected to the pressurized water supply pipe. The outlet of the water tank 2 is connected to the proportioner 3 and proportioning box 4 through pipes, respectively. The pipes are equipped with flow control valves and flow sensors. The pressure sensor must be installed inside the pressurized water tank 2.

[0050] A water pump is provided at the outlet of the open water tank 2, and pipes are provided through the water pump outlet to connect the proportioner 3 and the proportioning box 4, respectively, to pump clean water to the proportioner 3 or the proportioning box 4. A liquid level sensor is required to be provided in the open water tank 2 to automatically replenish clean water in the water tank 2 when the liquid level is low.

[0051] The outlet of water tank 2 is connected to proportioner 3 and proportioning tank 4 via pipes. Flow sensors and flow control valves are installed on the pipes from water tank 2 to proportioner 3 and proportioning tank 4. The flow control valves on the pipes control whether water is supplied to proportioner 3 or proportioning tank 4.

[0052] The proportioner 3 has two inlets, which are connected to the water tank 2 and the raw liquid tank 1 respectively. The outlet of the proportioner 3 is connected to the proportioning box 4. There are two types of cutting fluid proportioners 3: dynamic proportioners 3 and static mixers.

[0053] Dynamic proportioner 3: Contains power elements such as hydraulic pump, motor pump, diaphragm pump or screw pump to achieve quantitative liquid suction and mixing.

[0054] Static mixer: no moving parts, relies on special blades inside the tube to generate turbulence and shear to achieve oil-water mixing.

[0055] The proportioning tank 4 has three inlets: the main inlet is connected to the outlet of the proportioner 3, the water inlet is connected to the water tank 2 via a water bypass pipe 2a, and the raw liquid inlet is connected to the raw liquid tank 1 via a raw liquid bypass pipe 1a. Both the water bypass pipe 2a and the raw liquid bypass pipe 1a are equipped with flow sensors and flow control valves. The outlet of the proportioning tank 4 is connected to the liquid supply tank 5.

[0056] In the proportioning box 4, the cutting fluid stock solution and water are fully mixed to form the cutting fluid, which is usually an emulsion. To ensure that the water and the stock solution are fully mixed and emulsified, an agitator is provided in the proportioning box 4, preferably an aeration agitator. The proportioning box 4 is provided with a concentration detector 11 for detecting the concentration of the cutting fluid. Based on the feedback from the concentration detector 11, it is detected whether the cutting fluid concentration in the proportioning box 4 meets the set value. When the cutting fluid concentration is higher than the set value, the water supply flow rate should be increased and / or the stock solution supply flow rate should be reduced. When the cutting fluid concentration is lower than the set value, it is necessary to reduce the water supply flow rate and / or increase the stock solution supply flow rate.

[0057] After the proportioning box 4 completes the configuration of a batch of cutting fluid, it will transfer all the cutting fluid to the liquid supply box 5, and then start the configuration of the next batch. This cycle repeats in the process of filling → configuring → emptying → filling. In actual application, it is found that bubbles are prone to appear at the sensing head of the concentration detector 11, affecting its measurement accuracy. Therefore, the setting of the concentration detector 11 of the present invention has the following requirements:

[0058] A detection line 12 is vertically installed on the outer wall of the mixing tank 4. A concentration detector 11 is located in the middle of the detection line 12, with the sensor head of the concentration detector 11 embedded in the detection line 12. The upper and lower ends of the detection line 12 are connected to the interior of the mixing tank 4. A pump and a one-way valve are installed on the detection line 12. The one-way valve is installed at the bottom of the detection line 12 to ensure that liquid can only flow from the bottom to the top.

[0059] When concentration detector 11 is required (during the configuration process), the pump is activated to allow the liquid in mixing tank 4 to continuously flow through detection line 12 and back to mixing tank 4. During this process, concentration detector 11 senses the cutting fluid concentration. When mixing tank 4 is emptied, the one-way valve at the bottom of detection line 12 retains the liquid column in detection line 12, keeping the sensor head of concentration detector 11 immersed in water and preventing bubbles from forming on the surface of the sensor head due to repeated circulation between air and liquid.

[0060] The liquid supply tank 5 is used to hold the prepared cutting fluid. The volume of the liquid supply tank 5 is larger than the proportioning tank 4, usually 2-10 times that of the proportioning tank 4. A main liquid supply pump is set at the outlet of the liquid supply tank 5, and the main liquid supply pump pumps the cutting fluid into the liquid supply pipe 6.

[0061] The liquid supply pipe 6, which transports the cutting fluid from the liquid supply tank 5 to the various fluid-consuming devices, consists of a main pipe 6a and a branch pipe 6b. The inlet of the main pipe 6a is connected to the outlet of the main liquid supply pump via a solenoid valve. The branch pipe 6b distributes the liquid from the main pipe 6a to the liquid supply tanks 7 located in the various machine tools. Its inlet is connected to the main pipe 6a, and its outlet is inserted into the cutting fluid tank. A valve is installed at the outlet of the branch pipe 6b.

[0062] This valve has two functions: First, when the liquid level in the supply tank 7 is low or cutting fluid needs to be replenished, the valve is opened to supply fluid to the supply tank 7. After replenishment, the valve is closed to prevent leakage of cutting fluid. Second, when the return pump 10 is extracting cutting fluid from the supply tank 7, if the liquid level in the supply tank 7 falls below the set return level, the valve is closed to prevent a large amount of air from entering the branch pipe 6b and affecting the pressure in other branch pipes 6b. It should be noted that the outlet of the branch pipe 6b is lower than the set return level.

[0063] The supply tank 7 is located near the fluid-consuming equipment and contains a terminal level sensor. The fluid-consuming equipment (primarily various machine tools) draws cutting fluid directly from the supply tank 7. A drain port is located at the bottom of the supply tank 7 and is connected to the waste cutting fluid recovery system. This drain port is used to drain cutting fluid below the return level.

[0064] Temporary storage tank 8 is normally empty and is used to store old cutting fluid only when the cutting fluid concentration needs to be changed and the old cutting fluid needs to be re-proportioned. Its volume is no less than that of the fluid supply tank 5. Temporary storage tank 8 is connected to the main pipe 6a via a return pipe 9. This return pipe 9 is equipped with a return pump 10, which can pump cutting fluid from the fluid supply pipe 6 and / or fluid supply tank 7 back to the temporary storage tank 8. The inlet of temporary storage tank 8 is connected to the fluid supply tank 5 to transfer the cutting fluid from the fluid supply tank 5 to the temporary storage tank 8, while the outlet of temporary storage tank 8 is connected to the proportioning tank 4.

[0065] This application proposes two ways to transfer the liquid in the liquid supply tank 5 to the temporary storage tank 8:

[0066] (1) A second water outlet can be provided on the liquid supply tank 5, and an independent water pump can be provided at the second water outlet to pump the cutting fluid in the liquid supply tank 5 to the temporary storage tank 8 through a pipeline using the independent water pump.

[0067] (2) A second valve is provided on the main pipe 6a, downstream of the connection point between the main pipe 6a and the return pipe 9. When the cutting fluid in the supply tank 5 needs to be transferred to the temporary storage tank 8, the valve at the inlet end of the main pipe 6a is opened, the second valve is closed, and the return pump 10 or the main supply pump is started. The cutting fluid flow path is as follows: supply tank 5 → main pipe 6a → return pipe 9 → temporary storage tank 8.

[0068] The present invention also provides a cutting fluid concentration re-proportioning method using the cutting fluid automatic filling system, the method comprising the following steps:

[0069] a. Transfer the remaining old cutting fluid in the liquid supply tank 5 to the temporary storage tank 8;

[0070] b. Start the liquid return pump 10 to extract the old cutting fluid in the liquid supply pipe 6 and the liquid supply tank 7 and pump it to the temporary storage box 8.

[0071] Step b specifically includes the following steps:

[0072] b-1. Before starting the liquid return pump 10, close the valve at the inlet of the main pipe 6a;

[0073] b-2. After starting the liquid return pump 10, if the liquid level in any liquid supply tank 7 is lower than the set liquid return level, close the valve on the branch pipe 6b connected to the liquid supply tank 7;

[0074] b-3. After all valves on the branch pipes 6b are closed, the liquid return pump 10 is closed with a time delay.

[0075] The shut-off delay time of the return pump 10 needs to be debugged on site, so as to pump the cutting fluid in the main pipe 6a back to the temporary storage box 8. Since there are many branch pipes 6b and the valves at the ends of the branch pipes 6b are difficult to be completely sealed, some air will enter the branch pipes 6b.

[0076] It should be noted that there is no strict order requirement for step a and step b. Step b can be performed first and then step a, or they can be performed simultaneously. If they are performed simultaneously, it is necessary to adopt the method of "transferring the liquid in the liquid supply tank 5 to the temporary storage tank 8" in the first (1) step.

[0077] c. Transfer part of the old cutting fluid in the temporary storage box 8 to the proportioning box 4. The volume of the old cutting fluid transferred to the proportioning box 4 shall not be greater than the volume of the proportioning box 4, and the proportioning box 4 shall be able to complete the re-proportioning according to the difference in concentration between the new cutting fluid and the old cutting fluid.

[0078] d. Set the new cutting fluid concentration and compare it with the old cutting fluid concentration. When the new set concentration is greater than the old concentration, inject the cutting fluid from the original liquid tank 1 into the proportioning tank 4 until the new set concentration is reached; when the new set concentration is less than the old concentration, inject water from the water tank 2 into the proportioning tank 4 until the new set concentration is reached;

[0079] e. Transfer the new cutting fluid in the proportioning box 4 to the liquid supply box 5, and the liquid supply box 5 supplies the new cutting fluid to the liquid supply tank 7 through the liquid supply pipe 6;

[0080] Repeat steps ce until all the old cutting fluid in the temporary storage box 8 is reconfigured into new cutting fluid.

[0081] When there is a drain port, after the valve of the branch pipe 6b connected to the liquid supply tank 7 is closed, the drain port of the liquid supply tank 7 is opened to drain the remaining cutting fluid, and the drain port is closed before step e.

[0082] When the cutting fluid concentration is higher than the set value, the water supply flow rate is increased and / or the stock fluid supply flow rate is reduced; when the cutting fluid concentration is lower than the set value, the water supply flow rate is reduced and / or the stock fluid supply flow rate is increased.

[0083] The cutting fluid automatic filling system of the present invention has the following advantages:

[0084] The overall emptying waste is eliminated. In the existing centralized liquid supply system, every time the cutting fluid concentration changes, all the old liquid in the storage tank, pipeline and each machine tool cutting fluid tank must be emptied, resulting in a large amount of emulsion and original liquid being scrapped. The present invention splits the proportioning process and the storage and supply process into the proportioning box 4 and the liquid supply tank 5, and adds a "temporary storage box 8 + return liquid pump 10" recovery subsystem. The cutting fluid in the liquid supply tank 5 can be transferred to the temporary storage box 8, and the return liquid pump 10 can draw the residual liquid in the pipeline and the liquid supply tank 5 back to the temporary storage box 8, and the temporary storage box 8 will send the recovered liquid back to the proportioning box 4 for remixing. In this way, the concentration adjustment can be completed without overall emptying, which greatly reduces the amount of scrap and significantly reduces the operating cost.

[0085] The concentration switching cycle is shortened. Traditional systems require "waste disposal → cleaning → re-mixing → replenishing" when changing concentration. This is a cumbersome process and often involves downtime, which affects production efficiency. The present invention uses a return pump 10 to directly pump the residual old liquid in the pipeline and liquid supply tank 7 to the temporary storage tank 8, which is then connected to the proportioning tank 4 in the background to complete the proportioning. After the partial recovery liquid is prepared, it can be immediately returned to the liquid supply tank 5 for continued use. Cutting fluid concentration switching can be carried out in parallel with machine tool operation, significantly reducing downtime and improving equipment utilization.

[0086] Recycling is achieved and waste liquid emissions are reduced. Traditional centralized liquid supply systems generate a large amount of waste liquid, which not only increases the processing burden but also brings environmental pressure. The present invention recovers the old cutting fluid through the temporary storage box 8 and recycles it after redistribution in the proportioning box 4, without discharging the old fluid to the waste liquid recovery system. The cutting fluid is recycled in the closed loop of "recycling → redistribution → resupply", and the waste liquid emission is significantly reduced, which meets the requirements of green manufacturing and circular economy.

[0087] The cutting fluid concentration re-proportioning method disclosed herein can further optimize the re-proportioning process. Specifically, it can switch concentrations without draining or cleaning, achieving a "recycled fluid → re-proportioning → new fluid supply" operation. Re-proportioning can be performed in batches (partially re-proportioned), with rapid return of supply, minimizing disruption to production caused by batch switching. The process is simple, highly automated, saves labor costs, and improves overall production efficiency and environmental benefits.

[0088] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cutting fluid automatic filling system, characterized in that: The invention comprises a raw liquid tank (1) for storing raw cutting liquid and a water tank (2) for storing water; the outlets of the water tank (2) and the raw liquid tank (1) are connected to a proportioning device (3); the outlet of the proportioning device (3) is connected to a proportioning box (4); a stirrer is arranged in the proportioning box (4); the outlet of the proportioning box (4) is connected to a liquid supply box (5); and the outlet of the liquid supply box (5) is connected to a liquid supply pipe (6); The liquid supply pipe (6) is composed of a main pipe (6a) and a plurality of branch pipes (6b). The inlet of the main pipe (6a) is connected to the outlet of the liquid supply box (5) through a valve. The inlet end of the branch pipe (6b) is connected to the main pipe (6a). The outlet is inserted into the liquid supply tank (7). A valve is provided at the outlet of the branch pipe (6b). The liquid supply tank (7) is arranged at the liquid-using equipment and is provided with a terminal liquid level sensor; The automatic filling system further comprises a temporary storage box (8), the inlet of which is in communication with the liquid supply box (5) and is capable of transferring the cutting fluid in the liquid supply box (5) to the temporary storage box (8); the temporary storage box (8) is connected to the main pipe (6a) via a liquid return pipe (9); a liquid return pump (10) is provided on the liquid return pipe (9) for pumping the cutting fluid in the liquid supply pipe (6) and / or the liquid supply tank (7) back to the temporary storage box (8); and the outlet of the temporary storage box (8) is in communication with the proportioning box (4).

2. The cutting fluid automatic filling system according to claim 1, characterized in that: The raw liquid tank (1) is directly connected to the proportioning tank (4) via a raw liquid bypass pipe (1a); and the water tank (2) is directly connected to the proportioning tank (4) via a water bypass pipe (2a).

3. The automatic cutting fluid filling system according to claim 1, characterized in that: A water pump, a flow meter and a flow control valve are provided on the pipeline from the outlet of the water tank (2) to the inlet of the proportioner (3); a raw liquid pump, a flow meter and a flow control valve are provided on the pipeline from the outlet of the raw liquid tank (1) to the inlet of the proportioner (3); The proportioning box (4) is provided with a concentration detector (11) for real-time monitoring of the proportioning concentration; When the cutting fluid concentration is higher than the set value, increase the water supply flow rate and / or reduce the raw fluid supply flow rate; When the cutting fluid concentration is lower than the set value, reduce the water supply flow rate and / or increase the raw fluid supply flow rate.

4. The automatic cutting fluid filling system according to claim 3, characterized in that: A detection pipeline (12) is vertically arranged on the outer wall of the proportioning box (4), and the concentration detector (11) is arranged in the middle of the detection pipeline (12); The upper and lower ends of the detection pipeline (12) are respectively connected to the interior of the proportioning box (4). A pump and a one-way valve are provided on the detection pipeline (12). The one-way valve is provided at the bottom of the detection pipeline (12) and only allows liquid to move from bottom to top.

5. The automatic cutting fluid filling system according to claim 1, characterized in that: A drain port is provided at the bottom of the liquid supply tank (7), and the drain port is connected to a cutting fluid waste recovery system.

6. The automatic cutting fluid filling system according to claim 1, characterized in that: The stirrer in the proportioning box (4) is an aeration stirrer.

7. A cutting fluid concentration re-proportioning method applied to the cutting fluid automatic filling system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: a. Transfer the remaining old cutting fluid in the fluid supply tank (5) to the temporary storage tank (8); b. Start the liquid return pump (10) to extract the old cutting fluid in the liquid supply pipe (6) and the liquid supply tank (7) and pump it into the temporary storage box (8); c. Transferring part of the old cutting fluid in the temporary storage box (8) to the proportioning box (4); d. Set a new cutting fluid concentration and compare it with the old cutting fluid concentration; when the new set concentration is greater than the old concentration, inject the cutting fluid from the original liquid tank (1) into the proportioning tank (4) until the new set concentration is reached; when the new set concentration is less than the old concentration, inject water from the water tank (2) into the proportioning tank (4) until the new set concentration is reached; e. Transferring the new cutting fluid in the proportioning box (4) to the liquid supply box (5), and the liquid supply box (5) supplies the new cutting fluid to the liquid supply tank (7) through the liquid supply pipe (6); Repeat steps ce until all the old cutting fluid in the temporary storage box (8) is reconfigured into new cutting fluid.

8. The cutting fluid concentration re-proportioning method according to claim 1, characterized in that: Step b includes: b-1. Before starting the liquid return pump (10), close the valve at the inlet of the main pipe (6a); b-2. After starting the liquid return pump (10), if the liquid level in any liquid supply tank (7) is lower than the set liquid return level, close the valve on the branch pipe (6b) connected to the liquid supply tank (7); b-3. After all valves on the branch pipes (6b) are closed, the liquid return pump (10) is closed with a time delay.

9. The cutting fluid concentration re-proportioning method according to claim 8, characterized in that: When there is a drain port, after the valve of the branch pipe (6b) connected to the liquid supply tank (7) is closed, the drain port of the liquid supply tank (7) is opened to drain the remaining cutting fluid, and the drain port is closed before step e.

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