A simple water softening device for cutting fluid based on northern hard water

Abstract

The utility model relates to a simple water softening device for cutting fluid based on northern hard water, which comprises an upper tank section and a lower tank section. Hard water enters the reaction chamber through the water inlet pipe and mixes with the reagent composed of sodium carbonate, sodium hydroxide and sodium hexametaphosphate. Under the action of the manual stirring assembly, the precipitate is generated. The mixed solution is preliminarily filtered by the filter screen of the fan-shaped communication port of the partition plate and then enters the sedimentation filter chamber. The solid-liquid separation is realized by the inclined plate precipitator composed of the concentric conical inclined surface ring. The mixed solution is deeply purified by the multilayer filter assembly of nylon filter screen, quartz sand and activated carbon. Without complex electric control system, the utility model is low in cost and convenient to maintain, can stably control the water hardness in the cutting fluid adaptation range, and is suitable for the needs of small and medium-sized processing enterprises.

Description

Technical Field

[0001] This utility model relates to cutting fluid treatment equipment in the field of machining, specifically to a simple water softening device for cutting fluid based on hard water in northern regions. Background Technology

[0002] Due to geological conditions, groundwater and tap water in northern regions generally have high hardness, with calcium and magnesium ion concentrations often reaching 300-800 ppm, far exceeding the 50-300 ppm range suitable for cutting fluids. Some water that has undergone simple softening treatment may, due to improper control, fall into an over-softened state, i.e., with a hardness below 50 ppm. Both excessively high and low hardness will have a significant negative impact on the performance of cutting fluids.

[0003] When the hardness is too high, i.e., the concentration of calcium and magnesium ions exceeds 300 ppm, the calcium and magnesium ions in hard water will undergo a series of adverse reactions with the core components of the cutting fluid. For emulsified cutting fluids, calcium and magnesium ions will combine with emulsifiers (such as fatty acid salts) to form insoluble soap precipitates, leading to emulsion stratification, floating oil, easy rupture of the lubricating film during cutting, and an increase in tool wear rate of 20%-30%. Long-term use of high-hardness water will form scale in the machine tool cooling pipes and nozzles. When the flow cross-sectional area is reduced by more than 30%, it may lead to uneven cooling. At the same time, scale is prone to electrochemical corrosion at the metal contact interface, shortening the equipment life. In addition, calcium and magnesium ions will consume rust inhibitors (such as sodium nitrite and organic amines) in the cutting fluid, causing rust spots to appear on the workpiece within 4 hours after processing, especially significantly affecting high-carbon steel. Metal ions in hard water will also react with surfactants, leading to an increase in the amount of foam in the cutting fluid by more than 50%. The overflowing foam not only pollutes the workshop environment, but also causes the growth of anaerobic bacteria due to the foam blocking air, accelerating the deterioration and foul odor of the cutting fluid.

[0004] When the hardness is too low, i.e., below 50 ppm, some companies resort to excessive softening treatment (such as simply using ion exchange resin) to solve the high hardness problem, which actually causes new problems. Semi-synthetic and fully synthetic cutting fluids require a certain concentration of calcium and magnesium ions as a "bridge" to stabilize the micelle structure formed by surfactants. Soft water causes the micelle size to increase from 0.1 μm to over 1 μm, making the cutting fluid prone to "oil separation" and reducing cooling efficiency by 15%-20%. Soft water lacks calcium and magnesium ions, which cannot form a protective film with the corrosion inhibitors in the cutting fluid. After processing, aluminum, copper, and other non-ferrous metal workpieces are prone to "white spots" and "pitting corrosion," especially in environments with humidity exceeding 60%, where the corrosion rate increases by 40%. At the same time, soft water has a stronger dilution capacity for cutting fluids, requiring an additional 20%-30% of the original solution to maintain an effective concentration; moreover, soft water more easily dissolves grease on the machine tool metal surface, leading to an increase in the impurity oil content in the cutting fluid and shortening the replacement cycle to half of the original.

[0005] Current solutions for treating water used in cutting fluids have significant shortcomings. Traditional ion exchange equipment, while reducing hardness, requires frequent resin regeneration (1-2 times per week), making it complex and costly (10,000-30,000 RMB per unit, unaffordable for small and medium-sized enterprises). Furthermore, it lacks precise hardness control, easily leading to over-softening. Reverse osmosis systems can reduce hardness to almost zero, but the investment exceeds 50,000 RMB, and the water production rate is only 30%-40%, resulting in significant water waste and making it unsuitable for scenarios requiring large water volumes, such as cutting fluids. Simple sedimentation methods, relying solely on the addition of single reagents like sodium carbonate, cannot stably control the hardness range, with fluctuations often reaching ±100 ppm. Moreover, the lack of a filtration system allows sediment to easily enter the cutting fluid system with the water flow, causing secondary pollution.

[0006] Therefore, given the characteristics of water quality in northern regions, there is an urgent need for a treatment device that can stably control hardness at 50-200ppm (compatible with mainstream cutting fluids), has a simple structure, low cost, and requires no professional maintenance, in order to solve the triple contradiction in existing technologies: "excessive hardness is harmful, excessive softening causes many problems, and high equipment costs." Utility Model Content

[0007] In response to the current situation where excessively hard water in northern regions can easily lead to the deterioration of cutting fluid performance and excessive softening can also cause processing problems, and existing treatment equipment suffers from defects such as complex structure, high cost, and insufficient control precision, this utility model aims to provide a simple softening device for cutting fluid based on hard water in northern regions. This device integrates chemical precipitation reaction and physical filtration functions, eliminating the need for a complex electrical control system. It can stably control the water hardness within the suitable range of 50-200ppm for cutting fluids. At the same time, it features a simple structure, low manufacturing cost, and convenient operation and maintenance, effectively solving the triple contradictions existing in the prior art and meeting the actual needs of small and medium-sized processing enterprises.

[0008] To achieve the above objectives, the specific solution of this utility model is as follows: A simple softening device for cutting fluid based on hard water in northern China includes a main tank (1), which is composed of an upper tank section (1-1) and a lower tank section (1-2). The lower end of the upper tank section (1-1) and the upper end of the lower tank section are detachably sealed by a flange, and a partition is sandwiched between the flanges. The partition divides the interior of the main tank into an independent upper and lower reaction chamber and a sedimentation and filtration chamber connected by a connecting port. The reaction chamber is located in the upper tank section, and the sedimentation and filtration chamber is located in the lower tank section. The upper tank section is provided with a water inlet pipe and a reagent addition port, and the reaction chamber is provided with a stirring assembly. The lower tank section is provided with an inclined plate sedimentator in the upper part, a filtration assembly in the lower part, and a drain pipe at the bottom. The lower tank section is provided with a water outlet pipe on the upper side wall, and the water outlet pipe is located above the inclined plate sedimentator. The partition is provided with multiple connecting ports, and a 40-mesh filter screen is provided at the connecting ports.

[0009] Furthermore, the connecting openings are located near the edge of the partition and are evenly distributed circumferentially, with a fan-shaped outline; the filter screen has a rectangular outline.

[0010] Furthermore, the partition is circular, with an outer diameter larger than the inner diameter of the flange. The upper and lower surfaces of the partition are tightly fitted with the flange face at the lower end of the upper tank section and the flange face at the upper end of the lower tank section, respectively, through sealing gaskets, and the sealing and fixing are achieved by the clamping force of the flange.

[0011] Furthermore, the stirring assembly includes a manual crank and one or more sets of propeller blades, each set containing multiple blades; the manual crank passes through the sealed bearing at the top of the upper tank section and extends into the reaction chamber, the propeller blades are fixedly mounted on the spokes, the spokes are evenly distributed circumferentially and fixed on the hub, and the hub is fixed on the manual crank located inside the reaction chamber.

[0012] Furthermore, the filter assembly consists of a 50-mesh nylon filter screen, a quartz sand layer, and an activated carbon layer from top to bottom. The quartz sand layer has a particle size of 5-10 mm, and the activated carbon layer has a particle size of 3-8 mm. A support mesh is provided below the filter assembly. The support mesh is detachably connected to the inner wall of the lower tank section, and a 5-8 cm sediment storage space is reserved between the lower surface of the support mesh and the bottom of the lower tank section. This space is connected to the sewage pipe.

[0013] Furthermore, the inclined plate sedimentation tank consists of several concentric conical inclined rings and multiple circumferentially distributed and connected spokes. The angle between the generatrix of the conical inclined ring and the horizontal plane is 60°, and an 8-12cm water flow channel is reserved between adjacent conical inclined rings. The outer edge of the conical inclined ring is sealed to the inner wall of the lower tank section by an arc-shaped sealing strip.

[0014] Furthermore, the medicine adding port is equipped with a threaded sealing cap, the inner wall of the sealing cap is provided with internal threads, the outer wall of the medicine adding port is provided with external threads, the sealing cap and the medicine adding port are sealed by thread engagement, and a rubber sealing gasket is provided on the inner side of the sealing cap.

[0015] Furthermore, the diameter of the inlet pipe and the outlet pipe is 20mm. The inlet pipe is welded or threaded to the top of the upper tank section, the outlet pipe is welded or threaded to the side wall of the lower tank section, and the drain pipe is welded or threaded to the bottom wall of the lower tank section. The drain pipe, the inlet pipe and the outlet pipe are all equipped with manual shut-off valves, and the inlet end of the outlet pipe is equipped with an anti-vortex baffle.

[0016] Furthermore, the outer wall of the upper tank section is provided with a vertically extending transparent acrylic liquid level tube. The lower end of the transparent acrylic liquid level tube is connected to the lower part of the upper tank section and fixedly sealed. The upper end is open to the atmosphere and is higher than the drug addition port. The surface of the liquid level tube is provided with scale lines.

[0017] Furthermore, the bottom outer side of the lower tank section is provided with 3-4 circumferentially distributed support feet. The support feet are welded or bolted to the bottom of the lower tank section. The height of the support feet is 8-12cm, and the lower end face of the support feet is provided with rubber anti-slip pads. The rubber anti-slip pads are fixed to the support feet by countersunk bolts.

[0018] The beneficial technical effects of this utility model are as follows: I. Precisely control water hardness to meet the needs of cutting fluid usage. This invention integrates chemical precipitation and physical filtration to construct a three-stage treatment system for effective control of water hardness. Inside the reaction chamber, the reagent and hard water are thoroughly mixed, causing ions affecting the performance of the cutting fluid to be directionally converted into precipitates. A subsequent inclined plate settler efficiently intercepts these precipitates, preventing them from entering subsequent treatment stages. Further deep purification through a filter screen and multi-layer filtration structure ultimately stabilizes the effluent hardness within the appropriate range for the cutting fluid. This process solves the problems of easy stratification of the cutting fluid, easy corrosion of workpieces, and easy scaling of equipment when the hardness is too high. It also avoids the performance degradation of the cutting fluid and abnormal processing of non-ferrous metals caused by excessive softening, ensuring that the cutting fluid continues to provide stable lubrication, cooling, and rust prevention.

[0019] Second, its simple structure and low cost make it suitable for the needs of small and medium-sized enterprises. The device adopts a modular design, with the main tank divided into upper and lower sections, which can be detachably connected through a simple structure, eliminating the need for complex electrical control systems and precision components. The core operating components are manually driven, requiring no external power, significantly simplifying the overall structure. In terms of material selection, conventional materials suitable for hard water and cutting fluid environments are prioritized, avoiding the use of high-cost special components. Compared to existing complex treatment equipment, this device significantly reduces manufacturing costs and eliminates subsequent expenses such as frequent consumable replacements and professional regeneration maintenance, better meeting the economic needs of small and medium-sized processing enterprises and lowering the application threshold for hard water softening treatment.

[0020] III. Easy operation and maintenance, reducing the difficulty of on-site use. The device is designed with the actual operating scenarios in the workshop in mind, simplifying the entire process. The upper tank section features an intuitive liquid level observation structure, allowing direct monitoring of the liquid level in the reaction chamber and preventing operational errors. The reagent addition process utilizes a sealed structure for convenient addition and storage protection, eliminating the need for complex metering and control. The stirring operation requires no specialized skills and can be performed by a single person. The filter components are detachable, eliminating the need to disassemble the entire tank for replacement and cleaning, reducing maintenance procedures. Even non-technical personnel can master the entire process of water inlet, reagent addition, water outlet, and wastewater discharge after simple guidance, significantly lowering the technical barrier to on-site use.

[0021] IV. Adaptable to workshop operating environments, enhancing stability and safety. Designed specifically for the unique environment of machining workshops, the equipment features enhanced environmental adaptability and operational safety in its detailed design. The bottom support structure addresses potential slippery conditions on workshop floors, preventing the device from tipping over. The anti-disturbance structure of the outlet pipe prevents water flow impact from affecting sedimentation, ensuring stable effluent quality. A sealed structure effectively isolates each chamber, preventing liquid cross-contamination and treatment failure. The overall material is resistant to hard water and cutting fluid corrosion, minimizing the risk of long-term damage and malfunction. Furthermore, each pipeline is equipped with convenient control components, allowing for rapid water shut-off in emergencies, enhancing the stability and safety of on-site operation in the workshop. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 for Figure 1 A sectional view.

[0024] Figure 3 This is a schematic diagram of the structure of the partition of this utility model.

[0025] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0026] Figure 5 This is a schematic diagram of the structure of the stirring assembly of this utility model.

[0027] Figure 6 This is a schematic diagram of the structure of the filter assembly of this utility model.

[0028] Figure 7 This is a schematic diagram of the inclined plate sedimentation device of this utility model. Detailed Implementation

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the paper. This orientation or positional relationship is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] like Figure 1-7 The illustrated simple softening device for cutting fluid based on hard water in northern regions includes a main tank 1, which is composed of an upper tank section 1-1 and a lower tank section 1-2. The lower end of the upper tank section 1-1 and the upper end of the lower tank section 1-2 are detachably and sealed together by a flange 1-3, and a partition 11 is sandwiched between the flanges 1-3. The partition 11 divides the interior of the main tank 1 into an independent reaction chamber 2 and a sedimentation and filtration chamber 3 connected by a connecting port. The reaction chamber 2 is located in the upper tank section 1-1, and the sedimentation and filtration chamber 3 is... The sedimentation filtration chamber 3 is located inside the lower tank section 1-2; the upper tank section 1-1 is provided with a water inlet pipe 4 and a reagent addition port 5 at the top, and the reaction chamber 2 is provided with a stirring assembly 6; the lower tank section 1-2 is provided with an inclined plate sedimentator 7 at the top, a filter assembly 8 at the bottom, and a drain pipe 9 at the bottom; the lower tank section 1-2 is provided with a water outlet pipe 10 on the upper side wall, and the water outlet pipe 10 is located above the inclined plate sedimentator 7; the partition plate 11 is provided with multiple connecting ports 111, and a 40-mesh filter screen 112 is provided at each connecting port 111.

[0033] The water softening principle of this embodiment is as follows: The core of the water softening principle in this embodiment is to gradually remove calcium and magnesium ions and impurities from hard water through the synergistic effect of "chemical precipitation reaction + multi-stage physical separation", ultimately obtaining softened water suitable for use in cutting fluids. The specific process revolves around the water flow path and the action of the chemicals: First, hard water from the north enters the reaction chamber through the inlet pipe of the upper tank section, while softening agents are added sequentially through the agent addition port. The agents used consist of a main reactant, a pH adjuster, and a dispersant. The main reactant is sodium carbonate, the pH adjuster is sodium hydroxide, and the dispersant is sodium hexametaphosphate. Sodium carbonate, as the main reactant, reacts chemically with calcium and magnesium ions in the hard water to form insoluble calcium carbonate and magnesium hydroxide precipitates, respectively, thus converting hard water ions into solid precipitates. Sodium hydroxide, as the pH adjuster, adjusts the pH of the surface water in the reaction chamber to an alkaline range of 10-11. This range significantly improves the precipitation stability of calcium carbonate and magnesium hydroxide, preventing the precipitates from dissolving and flowing back due to excessively low pH, while also inhibiting microbial activity in the water and reducing the risk of subsequent cutting fluid deterioration. Sodium hexametaphosphate, as the dispersant, adsorbs onto the surface of the generated precipitates, forming a charged protective film to prevent precipitate particles from agglomerating and clogging subsequent connections and filtration structures, ensuring smooth water flow. Subsequently, under the mechanical stirring action of the stirring component in the reaction chamber, the reagent and hard water are fully mixed to ensure that the calcium and magnesium ions react completely with the reagent, forming a uniformly dispersed mixture containing precipitate. Next, the mixture containing the precipitate enters the sedimentation and filtration chamber through the connecting port on the partition. The 40-mesh filter at the connecting port first intercepts the larger undispersed precipitate particles in the mixture, achieving "preliminary coarse filtration". At the same time, it slows down the flow rate of the mixture to avoid directly impacting the subsequent sedimentation structure and ensures the stability of the sedimentation process. After entering the sedimentation and filtration chamber, the mixed liquid first flows through the upper inclined plate settler. The concentric conical inclined ring structure of the inclined plate settler provides sufficient settling carrier for fine precipitates. Under the action of gravity, the precipitates in the mixed liquid adhere to the surface of the inclined ring and then slide naturally along the inclined plate surface to the lower part of the sedimentation and filtration chamber, achieving preliminary solid-liquid separation with the clear water, completing "secondary sedimentation and separation", and reducing the processing load of subsequent filtration components. Subsequently, the clear water separated by the inclined plate settler continues to flow downward through the lower filter assembly. The filter assembly, through the synergistic effect of multiple media, further adsorbs and intercepts the residual tiny sediments and impurities in the water, achieving "deep filtration" and ensuring that the effluent water quality meets the softening standards suitable for cutting fluid. Finally, the softened water that meets the standards is discharged from the outlet pipe on the upper side wall of the lower tank section for use in the preparation of cutting fluid; while the precipitates generated by the reaction and the impurities intercepted by the filter components accumulate at the bottom of the sedimentation and filtration chamber and are periodically discharged through the drain pipe at the bottom to ensure the continuous and stable operation of the equipment. The entire process requires no complex electrical control system. Through the combination of a clear reagent formula and chamber partitioning and physical separation structure, it achieves efficient and simple softening of hard water, while also taking into account the ease of equipment maintenance, making it suitable for the actual needs of small and medium-sized processing enterprises.

[0034] In another preferred embodiment, the connecting port 111 is located near the edge of the partition 11 and is evenly distributed circumferentially, with a fan-shaped outline; the filter screen 112 has a rectangular outline. This preferred embodiment, by designing the connecting port as a fan shape and evenly distributed circumferentially along the edge of the partition, adapts it to the circumferential structure of the cylindrical tank, allowing the mixed liquid in the reaction chamber to flow evenly into the sedimentation and filtration chamber from multiple directions, avoiding local water flow impact caused by water entering from a single direction; at the same time, setting the filter screen as rectangular can not only completely cover the fan-shaped connecting port to intercept impurities, but also fit the edge of the partition to simplify the installation and replacement process, ultimately improving the uniformity of water flow distribution and the initial filtration effect through the adaptability of the structural shape.

[0035] In another preferred embodiment, the partition 11 is circular, with an outer diameter larger than the inner diameter of the flange 1-3. The upper and lower surfaces of the partition 11 are tightly fitted with the flange face at the lower end of the upper tank section 1-1 and the flange face at the upper end of the lower tank section 1-2, respectively, using sealing gaskets. The clamping force of the flange 1-3 achieves a sealed fixation. This preferred embodiment sets the partition to be circular with an outer diameter larger than the inner diameter of the flange, allowing its edges to extend beyond the flange contact surface. The flange clamping force then tightly presses the upper and lower surfaces of the partition against the flange face, and the sealing gasket fills the gaps, forming a double-sealed structure. This design completely blocks liquid cross-flow between the reaction chamber and the sedimentation and filtration chamber, preventing unreacted hard water or sediment from interfering with the chamber flow, ensuring that the chemical precipitation and physical filtration processes proceed independently and efficiently.

[0036] In another preferred embodiment, the stirring assembly 6 includes a manual crank 61 and one or more sets of propeller blades 62, each set containing multiple blades. The manual crank 61 passes through a sealed bearing 63 at the top of the upper tank section 1-1 and extends into the reaction chamber 2. The propeller blades 62 are fixedly mounted on spokes 64, which are circumferentially distributed and fixed to a hub 65. The hub 65 is fixed to the manual crank 61 located within the reaction chamber 2. This preferred embodiment uses the hub and circumferentially distributed spokes to fix multiple sets of propeller blades, enabling the manual crank to rotate and drive the propeller blades to stir evenly within the reaction chamber. The sealed bearing ensures smooth crank rotation and prevents leakage of the reaction liquid from the crank's penetration point. The overall structure requires no external power; only manual drive is needed to achieve thorough mixing of the reagent and hard water, ensuring complete reaction of calcium and magnesium ions with the reagent, laying the foundation for subsequent precipitation separation.

[0037] In another preferred embodiment, the filter assembly 8 consists of a 50-mesh nylon filter screen 81, a quartz sand layer 82, and an activated carbon layer 83, from top to bottom. The quartz sand layer 82 has a particle size of 5-10 mm, and the activated carbon layer 83 has a particle size of 3-8 mm. A support mesh tray 84 is provided below the filter assembly 8. The support mesh tray 84 is detachably connected to the inner wall of the lower tank section 1-2, and a 5-8 cm sediment storage space is reserved between the lower surface of the support mesh tray 84 and the bottom of the lower tank section 1-2. This space is connected to the drain pipe 9. This preferred embodiment uses a multi-layer filter media combination. The upper nylon filter screen first intercepts larger impurities, while the middle quartz sand layer and the lower activated carbon layer gradually adsorb small particles and residual ions, achieving deep filtration. The support mesh tray not only fixes the filter layer structure but also facilitates later replacement of the filter media through its detachable design. The reserved sediment storage space below it can collect impurities that fall during the filtration process and periodically discharge them through the drain pipe, preventing impurities from clogging the filter layer and ensuring the long-term stable operation of the filter assembly.

[0038] In another preferred embodiment, the inclined plate settler 7 consists of several concentric conical inclined rings 71 and multiple circumferentially distributed and connected spokes 72. The angle between the generatrix of the conical inclined rings 71 and the horizontal plane is 60°, and an 8-12cm water flow channel is reserved between adjacent conical inclined rings. The outer edge of the conical inclined rings 71 is sealed to the inner wall of the lower tank section 1-2 by an arc-shaped sealing strip. In this preferred embodiment, several concentric conical inclined rings are connected into a whole by spokes to form a stable sedimentation structure. The 60° angle between the generatrix of the inclined surfaces allows the sediment to slide quickly to the bottom of the tank under the action of gravity, avoiding adhesion to the inclined surface and blocking the water flow channel. The water flow channel between adjacent conical rings can guide the mixed liquid to flow smoothly, and the arc-shaped sealing strip prevents the liquid from flowing sideways from the gap between the inclined plate and the tank wall, ensuring that all mixed liquids are treated by sedimentation and improving the solid-liquid separation efficiency.

[0039] In another preferred embodiment, the reagent addition port 5 is equipped with a threaded sealing cap 51. The inner wall of the sealing cap 51 has internal threads, and the outer wall of the reagent addition port 5 has external threads. The sealing cap 51 and the reagent addition port 5 are sealed by threaded engagement, and a rubber sealing gasket is provided on the inner side of the sealing cap 51. This preferred embodiment uses threaded engagement to ensure a tight connection between the sealing cap and the reagent addition port, achieving basic fixation and sealing. The rubber sealing gasket on the inner side of the sealing cap can fill the thread gaps, further enhancing the sealing performance. This not only prevents external moisture from entering the addition port and causing the reagent to become damp and deteriorate, but also prevents liquid in the reaction chamber from splashing out of the addition port during stirring. At the same time, it facilitates the operator in opening and adding the reagent, balancing sealing performance and ease of operation.

[0040] In another preferred embodiment, the diameters of the inlet pipe 4 and the outlet pipe 10 are both 20mm. The inlet pipe 4 is welded or threaded to the top of the upper tank section 1-1, the outlet pipe 10 is welded or threaded to the side wall of the lower tank section 1-2, and the drain pipe 9 is welded or threaded to the bottom wall of the lower tank section 1-2. Manual shut-off valves 12 are installed on all three pipes: the drain pipe 9, the inlet pipe 4, and the outlet pipe 10. An anti-vortex baffle 101 is installed at the inlet end of the outlet pipe 10. This preferred embodiment uses inlet, outlet, and drain pipes of uniform diameter to meet the overall flow requirements of the device. Welding or threaded connections ensure a stable and leak-free connection between the pipes and the tank. The manual shut-off valves allow independent control of the flow of each pipe, facilitating inlet adjustment, outlet control, and drain operation. The anti-vortex baffle at the inlet end of the outlet pipe prevents the water flow from forming a rotating vortex, avoiding disturbance of the sediment in the inclined plate settler and ensuring the clarity of the effluent.

[0041] In another preferred embodiment, a vertically extending transparent acrylic liquid level tube 13 is provided on the outer wall of the upper tank section 1-1. The lower end of the transparent acrylic liquid level tube 13 is connected to and fixedly sealed with the lower part of the upper tank section 1-1, while the upper end is open to the atmosphere and is higher than the reagent addition port 5. The surface of the liquid level tube 13 is provided with scale lines. This preferred embodiment is based on the principle of communicating vessels, connecting the lower end of the transparent acrylic liquid level tube to the lower part of the upper tank section so that the liquid level in the liquid level tube is consistent with the liquid level in the reaction chamber. The transparent material and the scale lines on the surface allow operators to visually observe the liquid level in the reaction chamber, avoiding overflow due to excessively high liquid level or dry running of the agitator due to excessively low liquid level. The design of the upper end of the liquid level tube being higher than the reagent addition port can prevent the reaction liquid from overflowing from the liquid level tube due to excessive pressure, ensuring accurate and safe liquid level observation.

[0042] In another preferred embodiment, the lower tank section 1-2 is provided with 3-4 circumferentially distributed support feet 14 on the outer side of its bottom. The support feet 14 are welded or bolted to the bottom of the lower tank section 1-2. The height of the support feet 14 is 8-12cm, and the lower end face of the support feet 14 is provided with a rubber anti-slip pad, which is fixed to the support feet 14 by countersunk bolts. This preferred embodiment provides stable support for the tank body through the circumferentially distributed support feet, avoiding direct contact between the tank body and the ground, which could lead to bottom corrosion or moisture. The height of the support feet provides operating space for the drain pipe, facilitating the cleaning of sediment by operators. The rubber anti-slip pad on the lower end face increases the friction with the ground, addressing the slippery problem caused by residual liquid on the workshop floor, preventing the tank from tipping over, and improving the safety and stability of the device in workshop settings.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A simple water softening device for cutting fluid based on hard water in northern regions, characterized in that, The system includes a main tank (1), which is composed of an upper tank section (1-1) and a lower tank section (1-2). The lower end of the upper tank section (1-1) and the upper end of the lower tank section (1-2) are detachably and sealed together by a flange (1-3), and a partition (11) is sandwiched between the flanges (1-3). The partition (11) divides the interior of the main tank (1) into an independent upper and lower reaction chamber (2) and a sedimentation and filtration chamber (3) connected by a connecting port. The reaction chamber (2) is located in the upper tank section (1-1), and the sedimentation and filtration chamber (3) is located in the lower tank section (1-2). Inside the upper tank section (1-1), a water inlet pipe (4) and a reagent addition port (5) are provided at the top, and a stirring assembly (6) is provided inside the reaction chamber (2); an inclined plate sedimentation device (7) is provided at the upper part of the lower tank section (1-2), a filter assembly (8) is provided at the lower part, and a sewage pipe (9) is provided at the bottom; a water outlet pipe (10) is provided on the upper part of the side wall of the lower tank section (1-2), and the water outlet pipe (10) is located above the inclined plate sedimentation device (7); a plurality of connecting ports (111) are provided on the partition plate (11), and a 40-mesh filter screen (112) is provided at the connecting port (111).

2. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The connecting port (111) is close to the edge of the partition (11) and is evenly distributed circumferentially, with a fan-shaped outline; the filter screen (112) has a rectangular outline.

3. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The partition (11) is circular, and the outer diameter of the partition (11) is larger than the inner diameter of the flange (1-3). The upper and lower surfaces of the partition (11) are tightly fitted with the flange face at the lower end of the upper tank section (1-1) and the flange face at the upper end of the lower tank section (1-2) through sealing gaskets, and the sealing and fixing are achieved by the clamping force of the flange (1-3).

4. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The stirring assembly (6) includes a manual crank (61) and one or more sets of propeller blades (62), each set containing multiple blades; the manual crank (61) passes through the sealed bearing (63) at the top of the upper tank section (1-1) and extends into the reaction chamber (2); the propeller blades (62) are fixedly mounted on the spokes (64); the spokes (64) are evenly distributed circumferentially and fixed on the hub (65); the hub (65) is fixed on the manual crank (61) located in the reaction chamber (2).

5. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The filter assembly (8) consists of a 50-mesh nylon filter screen (81), a quartz sand layer (82), and an activated carbon layer (83) from top to bottom. The quartz sand layer (82) has a particle size of 5-10 mm, and the activated carbon layer (83) has a particle size of 3-8 mm. The filter assembly (8) is provided with a support mesh tray (84) at the bottom. The support mesh tray (84) is detachably connected to the inner wall of the lower tank section (1-2), and a 5-8 cm sediment storage space is reserved between the lower surface of the support mesh tray (84) and the bottom of the lower tank section (1-2). This space is connected to the drain pipe (9).

6. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The inclined plate sedimentation tank (7) consists of several concentric conical inclined rings (71) and multiple circumferentially distributed and connected spokes (72). The angle between the generatrix of the inclined surface of the conical inclined ring (71) and the horizontal plane is 60°. An 8-12cm water flow channel is reserved between adjacent conical inclined rings. The outer edge of the conical inclined ring (71) is sealed to the inner wall of the lower tank section (1-2) by an arc-shaped sealing strip.

7. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The drug addition port (5) is equipped with a threaded sealing cap (51). The inner wall of the sealing cap (51) is provided with an internal thread, and the outer wall of the drug addition port (5) is provided with an external thread. The sealing cap (51) and the drug addition port (5) are sealed by threaded engagement, and a rubber sealing gasket is provided on the inner side of the sealing cap (51).

8. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The diameter of the inlet pipe (4) and the outlet pipe (10) is 20mm. The inlet pipe (4) is welded or threaded to the top of the upper tank section (1-1), the outlet pipe (10) is welded or threaded to the side wall of the lower tank section (1-2), and the drain pipe (9) is welded or threaded to the bottom wall of the lower tank section (1-2). The drain pipe (9), the inlet pipe (4) and the outlet pipe (10) are all equipped with manual shut-off valves (12). The inlet end of the outlet pipe (10) is equipped with an anti-vortex baffle (101).

9. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The outer wall of the upper tank section (1-1) is provided with a vertically extending transparent acrylic liquid level tube (13). The lower end of the transparent acrylic liquid level tube (13) is connected to the lower part of the upper tank section (1-1) and fixed and sealed. The upper end is connected to the atmosphere and is higher than the drug addition port (5). The surface of the liquid level tube (13) is provided with scale lines.

10. The simple water softening device for cutting fluid based on hard water in northern regions according to claim 1, characterized in that, The lower tank section (1-2) has 3-4 circumferentially distributed support feet (14) on the outer side of its bottom. The support feet (14) are welded or bolted to the bottom of the lower tank section (1-2). The height of the support feet (14) is 8-12cm, and the lower end face of the support feet (14) is provided with a rubber anti-slip pad. The rubber anti-slip pad is fixed to the support feet (14) by countersunk bolts.

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