A cutting fluid centrifugal separation device

Abstract

The present application relates to the technical field of cutting fluid filtration, and in particular to a cutting fluid centrifugal separation device, comprising a centrifugal cylinder, a liquid pumping pipe and a liquid feeding pipe; the cylinder wall of the centrifugal cylinder is provided with a plurality of slag discharge ports, and each slag discharge port is provided with a sealing plate; the sealing plate is further provided with a driving mechanism for driving the opening and closing of the slag discharge port; the liquid pumping pipe is inserted into the inside of the centrifugal cylinder and located below the liquid level of the clear liquid during centrifugation; and the liquid feeding pipe is inserted into the bottom of the centrifugal cylinder. The core structure of the centrifugal cylinder, the liquid pumping pipe and the liquid feeding pipe works cooperatively, the liquid feeding pipe continuously feeds the cutting fluid to be filtered, the centrifugal cylinder rotates at high speed to generate centrifugal force to throw the solid impurities to the cylinder wall for deposition, the liquid pumping pipe accurately pumps the clear liquid for recycling, and the driving mechanism controls the opening and closing of the sealing plate and the slag discharge port, so that the slag discharge process does not need to stop, and the core pain points of the existing device, such as production interruption and efficiency reduction caused by stopping for slag cleaning, are fundamentally solved.

Description

Technical Field

[0001] This invention relates to the technical field of cutting fluid filtration, and more specifically, to a cutting fluid centrifugal separation device. Background Technology

[0002] In the field of machining, cutting fluid, as a key auxiliary medium, is mainly used to reduce frictional resistance during the cutting process, remove heat generated during machining, and lubricate the contact surface between the cutting tool and the workpiece, thereby extending tool life, improving machining accuracy and surface quality. It is an important foundation for ensuring continuous and efficient machining. With the development of machining towards higher precision, higher speed, and larger scale, the consumption of cutting fluid has increased significantly. Its recycling can not only reduce production costs but also reduce environmental pollution caused by waste cutting fluid discharge, aligning with the industry trend of green manufacturing. Therefore, cutting fluid purification technology has become one of the key research areas in the machining field.

[0003] Centrifugal filtration technology, with its advantages of high separation efficiency, strong adaptability, and convenient operation, has become one of the mainstream technologies for cutting fluid purification and is widely used in the circulating filtration systems of various machine tool cutting fluids. The working principle of a centrifugal filtration device is to use the centrifugal force generated by high-speed rotation to throw solid impurities (filter residue) such as metal chips and grinding shavings mixed in the cutting fluid against the inner wall of the device and deposit them, achieving solid-liquid separation. The purified cutting fluid is then discharged through overflow or suction and recycled back into the machining process. Compared to traditional methods such as screen filtration and sedimentation filtration, centrifugal filtration devices can effectively handle cutting impurities with fine particle size and high hardness, avoiding the problems of easy clogging of screens and low filtration efficiency, demonstrating significant application advantages in the field of precision machining.

[0004] However, current commercially available centrifugal filtration devices for cutting fluids still have significant technical shortcomings in practical applications. The most prominent problem is that the filter residue cleaning process requires shutdown, severely impacting processing efficiency and the recycling rate of cutting fluid. Specifically, as the filtration process continues, solid filter residue in the cutting fluid accumulates on the inner wall of the centrifugal filtration device, the centrifuge cylinder, or filter cloth and other core components. If not cleaned in time, this leads to uneven centrifugal force distribution, clogging of the filtration channels, reduced filtration efficiency, and even affects the purity of the purified cutting fluid, indirectly damaging the quality of cutting tools and workpieces. In existing technologies, because the filter residue deposition area is mostly within the enclosed space inside the device and lacks an effective online cleaning structure design, the centrifugal filtration device must be stopped and its components disassembled before manual or mechanical cleaning can be performed. After cleaning, the equipment must be reassembled and tested before filtration operations can resume.

[0005] This method of shutting down for cleaning has many drawbacks: First, the shutdown process interrupts the circulation of cutting fluid, forcing the entire machining production line to stop operating. Especially in large-scale, continuous machining scenarios, frequent shutdowns for cleaning can significantly increase non-productive downtime, reduce production efficiency, and increase production costs. Second, manual disassembly and cleaning is not only labor-intensive and inefficient, but may also cause problems such as decreased sealing performance and component wear due to improper operation, shortening equipment lifespan and increasing equipment maintenance costs. In addition, frequent start-up and shutdown operations will exacerbate equipment energy consumption, which does not meet the industry's demand for energy conservation and emission reduction. Furthermore, if the filter residue is not cleaned in a timely or thorough manner, it may lead to filter residue clumping and adhesion, further increasing the difficulty of subsequent cleaning and creating a vicious cycle.

[0006] Currently, improvements in cutting fluid filtration technologies mainly focus on enhancing filtration accuracy and optimizing energy consumption. While some existing patented technologies involve structural improvements to centrifugal filtration devices, none have effectively addressed the core issue of requiring machine shutdown for filter cake cleaning. They fail to achieve continuous online cleaning of filter cakes and cannot balance filtration efficiency with ease of cleaning. With the increasing demands for production efficiency, automation, and environmental friendliness in the machining industry, existing centrifugal cutting fluid filtration devices that require machine shutdown for filter cake cleaning are no longer sufficient to meet actual production needs. Therefore, developing a centrifugal cutting fluid filtration device that enables online filter cake cleaning without shutdown and ensures continuous filtration operations has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a cutting fluid centrifugal separation device that can operate continuously without stopping to clean the filter residue.

[0008] The embodiments of the present invention are achieved through the following technical solutions: A cutting fluid centrifugal separator includes a centrifuge cylinder, a suction pipe, and a filling pipe; the centrifuge cylinder has several slag discharge ports on its wall, and each slag discharge port is equipped with a sealing plate; the sealing plate is also equipped with a driving mechanism to drive it to open and close the slag discharge port; the suction pipe is inserted into the centrifuge cylinder and is located below the liquid surface of the clear liquid during centrifugation; the filling pipe is inserted into the bottom of the centrifuge cylinder.

[0009] Furthermore, it also includes a support plate disposed below the centrifuge cylinder; the sealing plate is slidably disposed on the outer wall of the centrifuge cylinder; the sealing plate is equipped with a return spring, so that the return spring pushes the sealing plate to close the slag discharge port; The driving mechanism includes a push cylinder and a push plate connected to the push cylinder, so that the push cylinder pushes the push plate to rise or fall; the push cylinder and the push plate are both disposed on the support plate and cooperate with the sealing plate, so that when the push plate is raised, it can push the sealing plate to open the slag discharge port.

[0010] Furthermore, the centrifuge cylinder includes a slag discharge section and a collection section; the inner diameter of the collection section gradually decreases from bottom to top; the slag discharge section is cylindrical and connected to the lower part of the collection section; a plurality of slag discharge ports are provided in the slag discharge section; the inlet of the liquid extraction pipe is located in the upper part of the collection section.

[0011] Furthermore, the slag discharge port is funnel-shaped with its large diameter section located on the inner wall of the slag discharge section; the junction of two adjacent slag discharge ports is located on the inner wall of the slag discharge section and is blade-shaped.

[0012] Furthermore, the support plate is also provided with an annular baffle around the centrifuge cylinder so that the filter residue discharged from the slag discharge port is blocked by the baffle.

[0013] Furthermore, the support plate is also provided with a support ring; a plurality of balls are evenly arranged on the top of the support ring along its circumference, so that the bottom of the centrifuge cylinder is supported by the plurality of balls.

[0014] Furthermore, the end of the liquid addition tube is provided with two branch tubes so that the end of the liquid addition tube is Y-shaped; the two branch tubes extend towards the wall of the centrifuge cylinder.

[0015] Furthermore, the liquid addition tube includes a fixed tube and a rotating tube; the branch tube is disposed on the rotating tube; the rotating tube is connected to the fixed tube through a rotary joint.

[0016] Furthermore, the middle part of the push plate is higher than the two sides, so that the outline of the push plate is sinusoidal; the projection of the push plate on the horizontal plane is located inside the projection of the sealing plate's rotation trajectory on the horizontal plane.

[0017] Furthermore, a set of drive mechanisms is provided on both opposite sides of the support plate.

[0018] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: This invention features a core structure that integrates a centrifuge cylinder, a suction pipe, and a filling pipe. The filling pipe continuously delivers the cutting fluid to be filtered, while the high-speed rotation of the centrifuge cylinder generates centrifugal force that throws solid impurities against the cylinder wall for deposition. The suction pipe precisely extracts the clear fluid for recycling. Simultaneously, a drive mechanism controls the opening and closing of the slag discharge port on the sealing plate, eliminating the need to stop the machine during the slag discharge process. This fundamentally solves the core pain point of existing devices that cause production interruptions and reduced efficiency due to shutdown for slag cleaning. It achieves online, non-stop filtration and slag discharge of cutting fluid, balancing filtration efficiency and equipment continuity.

[0019] By setting a support plate below the centrifuge tube, a stable support is provided for the device and it serves as the mounting carrier for the drive mechanism. At the same time, the sealing plate adopts a sliding design, in conjunction with guide ears, guide rods and return springs. In the natural state, the return spring compresses and pushes the sealing plate to close the slag discharge port. When slag is discharged, the push cylinder drives the push plate to push the sealing plate open. After leaving the push plate, the return spring drives the sealing plate to close. Combined with the corrosion-resistant sealing strip on the contact surface between the sealing plate and the slag discharge port, the opening and closing stability and sealing effect of the sealing plate are improved, the leakage of cutting fluid during filtration is avoided, the wear of components is reduced and the service life is extended, and the problem of decreased sealing performance caused by improper manual assembly is solved.

[0020] The centrifuge tube is designed as a single-piece slag discharge section and collection section. The collection section is an inverted conical slope, which uses centrifugal force to guide solid impurities down the slope to the slag discharge section. The slag discharge section is cylindrical with evenly spaced slag discharge ports. At the same time, the liquid extraction pipe is located at the top of the collection section, so that the clear liquid and filter residue have a vertical distance, effectively preventing filter residue from mixing in during liquid extraction. Compared with traditional cylindrical centrifuge tubes, this design significantly improves the solid-liquid separation efficiency and the stability of clear liquid extraction, ensuring the purity of the purified cutting fluid.

[0021] The slag discharge port is designed in a funnel shape (with the larger diameter section on the inner wall and the smaller diameter section on the outer wall) to facilitate the rapid entry and discharge of filter residue under centrifugal force, reducing retention. The junction of the inner walls of adjacent slag discharge ports is designed in a knife-edge shape to prevent filter residue from accumulating and clogging. This effectively solves the problem of incomplete filter residue cleaning leading to a vicious cycle and further improves slag discharge efficiency.

[0022] By setting an annular baffle around the centrifuge cylinder on the support plate, the baffle is coaxial with the centrifuge cylinder, with an inner diameter larger than the outer diameter of the slag discharge section and a height higher than the slag discharge section. This can completely block the filter residue thrown out during slag discharge, preventing it from scattering and polluting the environment and wearing down equipment parts. At the same time, it facilitates the centralized collection and treatment of filter residue, reducing equipment maintenance costs.

[0023] A support ring with ball bearings is installed on the support plate, and the bottom of the centrifuge is supported on the ball bearings. This transforms traditional sliding friction into rolling friction, which greatly reduces friction. This not only reduces equipment energy consumption and meets energy-saving requirements, but also reduces component wear and extends service life. At the same time, the evenly distributed ball bearings provide stable support for the centrifuge, prevent rotation and shaking, ensure uniform centrifugal force, improve solid-liquid separation effect, and solve the problem of frequent start-stop cycles aggravating energy consumption and component wear.

[0024] The end of the liquid addition pipe is designed as a Y-shaped branch pipe symmetrically facing the inner wall of the centrifuge cylinder. This allows the cutting fluid to be filtered to be directly delivered to the vicinity of the centrifuge cylinder wall, avoiding the central area where the centrifugal force is relatively small. This prevents fine filter residue from failing to separate due to insufficient centrifugal force, thereby improving filtration efficiency and purification purity. At the same time, the liquid addition pipe is divided into a fixed pipe and a rotating pipe, which are connected by a rotary joint. This allows the rotating pipe to rotate synchronously with the centrifuge cylinder, preventing the fixed liquid addition pipe from obstructing the liquid rotation and causing turbulence. This further prevents filter residue from mixing into the clear liquid.

[0025] The push plate is designed with a sinusoidal curve profile, with the center higher than the sides, to achieve gradual contact and separation with the sealing plate, avoiding impact damage to components and ensuring smooth opening and closing and sealing effect of the sealing plate. At the same time, the projection of the push plate is located within the rotation trajectory of the sealing plate, ensuring precise contact and smooth slag discharge. By symmetrically setting two sets of drive mechanisms on both sides of the support plate, the sealing plate is subjected to uniform force, avoiding the impact of unilateral push on the rotational stability of the centrifuge, further improving the opening and closing stability of the sealing plate and the slag discharge efficiency. Moreover, the lifting time of the push plate can be set according to the rotation speed of the centrifuge to adapt to actual use needs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cutting fluid centrifugal separation device of the present invention.

[0027] Figure 2 This is a front view of the cutting fluid centrifugal separation device of the present invention.

[0028] Figure 3 This is a cross-sectional view of a cutting fluid centrifugal separator.

[0029] Figure 4 A schematic diagram of the slag discharge port setup.

[0030] Figure 5 for Figure 3 Enlarged view of point a in the middle.

[0031] Figure 6 for Figure 3 Enlarged view of point b in the middle.

[0032] Figure 7 for Figure 6 A magnified view of point c in the middle.

[0033] Figure 8This is a schematic diagram of the driving structure of the sealing plate.

[0034] Figure 9 for Figure 8 A magnified view of point d in the middle.

[0035] Reference numerals: 1-Centrifuge cylinder, 2-Liquid extraction pipe, 3-Liquid addition pipe, 4-Sealing plate, 5-Support plate, 6-Reset spring, 7-Slag discharge port, 8-Push plate, 9-Push cylinder, 10-Slag discharge section, 11-Collection section, 12-Baffle, 13-Support ring, 14-Ball bearing, 15-Branch pipe, 16-Fixed pipe, 17-Rotating pipe, 18-Guide ear, 19-Guide rod, 20-Disc. Detailed Implementation

[0036] Reference 1- Figure 9 As shown below, the cutting fluid centrifugal separation device of the present invention will be described in detail with reference to specific embodiments. The purpose is to solve the core pain points of the existing cutting fluid centrifugal filtration device in the background art, such as the need to stop the machine for cleaning, which affects production efficiency and increases maintenance costs. The device can realize online non-stop filtration and slag discharge of cutting fluid, while taking into account filtration efficiency, ease of cleaning and equipment stability.

[0037] The cutting fluid centrifugal separation device of the present invention includes a centrifuge cylinder 1, a liquid extraction pipe 2, and a liquid addition pipe 3. These three components work together to fundamentally solve the drawback of existing devices requiring shutdown for slag removal. Figure 3As shown, the centrifuge cylinder 1, as the core component for solid-liquid separation, has several slag discharge ports 7 on its cylinder wall. Each slag discharge port 7 is equipped with a corresponding sealing plate 4. The sealing plate 4 is precisely matched with the slag discharge port 7, which can achieve complete sealing of the slag discharge port 7, preventing the cutting fluid from leaking from the slag discharge port 7 during the filtration process and ensuring the normal operation of centrifugal filtration. To achieve automatic opening and closing of the sealing plate 4, each sealing plate 4 is equipped with a drive mechanism. The opening and closing state of the sealing plate 4 can be precisely controlled by the action of the drive mechanism. The liquid extraction pipe 2 is inserted into the centrifuge cylinder 1, and its pipe opening is precisely positioned below the liquid surface of the clear liquid during centrifugal filtration, ensuring stable extraction of the purified clear liquid and avoiding the mixing of unseparated solid impurities during the extraction process, thus ensuring the purity of the purified cutting fluid and protecting the quality of the cutting tools and workpieces. The liquid addition pipe 3 is inserted into the bottom of the centrifuge cylinder 1 to continuously deliver the cutting fluid to be filtered into the centrifuge cylinder 1, achieving continuous filtration operation. During operation, the liquid addition pipe 3 continuously adds the cutting fluid to be filtered into the centrifuge cylinder 1. The centrifuge cylinder 1 rotates at high speed, generating centrifugal force, which throws solid impurities such as metal chips and grinding shavings mixed in the cutting fluid onto the inner wall of the centrifuge cylinder 1 and deposits them. The purified liquid is then continuously pumped away through the liquid extraction pipe 2 and reused in machining. When a large amount of filter residue is detected to have accumulated on the inner wall of the centrifuge cylinder 1, or according to the preset periodic cleaning cycle, the drive mechanism drives the sealing plate 4 to open the slag discharge port 7, so that the accumulated filter residue is quickly discharged through the slag discharge port 7 of the centrifuge cylinder 1 under the action of centrifugal force. After the slag discharge is completed, the drive mechanism controls the sealing plate 4 to close the slag discharge port 7. The entire slag discharge process does not require stopping the rotation of the centrifuge cylinder 1, nor does it require stopping the machine to disassemble the equipment. It truly realizes online non-stop filtration and slag discharge, effectively solving the problem of production interruption and reduced efficiency caused by stopping the machine for slag cleaning in the background technology.

[0038] To further optimize the opening and closing stability and sealing effect of the sealing plate 4, this device also includes a support plate 5 located below the centrifuge cylinder 1. The support plate 5 provides stable support for the entire device and also provides a carrier for the installation of the drive mechanism. The sealing plate 4 is slidably mounted on the outer wall of the centrifuge cylinder 1. Specifically, a groove can be provided on the outer wall of the centrifuge cylinder 1 at the position corresponding to the slag discharge port 7. The sealing plate 4 is adapted to be embedded in the groove and can slide up and down along the groove to realize the opening and closing of the slag discharge port 7; see details for reference. Figure 8 The centrifuge cylinder 1 has several guide ears 18 on its outer wall, each with a guide hole; the sealing plate 4 has a guide rod 19 that slidably passes through the guide hole, allowing the sealing plate 4 to vertically rise and fall to open or close the slag discharge port 7. Figure 9As shown, the sealing plate 4 is also equipped with a return spring 6. One end of the return spring 6 is fixed to the outer wall of the centrifuge cylinder 1, and the other end is connected to the sealing plate 4. Specifically, the lower end of the guide rod 19 is provided with a protruding disc 20. The return spring 6 is sleeved on the outside of the guide rod 19, with one end pressing against the disc 20, and the other end pressing against the lower end of the guide ear 18. In its natural state, the return spring 6 is always in a compressed state, continuously pushing the sealing plate 4, causing the sealing plate 4 to move downward and close the slag discharge port 7, thus achieving reliable sealing of the slag discharge port 7 and preventing cutting fluid leakage during filtration. The driving mechanism includes a push cylinder 9 and a push plate 8. The push plate 8 is fixedly connected to the output end of the push cylinder 9, and the push cylinder 9 is fixedly installed on the support plate 5, with its installation position precisely corresponding to the sealing plate 4, ensuring that the push plate 8 can accurately act on the sealing plate 4 when it is raised. The support plate 5 is provided with a sliding groove for the push plate 8 to slide up and down. During operation, the centrifuge drum 1 rotates at high speed, causing the sealing plate 4 on the outer wall to rotate synchronously. When slag discharge is required, the push cylinder 9 drives the push plate 8 to rise. When the sealing plate 4 rotates above the push plate 8, the push plate 8 pushes the sealing plate 4 to slide upward along the guide hole, thereby opening the slag discharge port 7. The filter residue accumulated near the slag discharge port 7 is quickly discharged from the slag discharge port 7 under the action of centrifugal force. During this process, the return spring 6 is further compressed. After the sealing plate 4 rotates away from the top of the push plate 8 with the centrifuge drum 1, the sealing plate 4 slides downward along the slide groove under the elastic force of the return spring 6, and closes the slag discharge port 7 again, completing a brief slag discharge process. To further improve sealing performance and prevent cutting fluid from leaking through the gap between the sealing plate 4 and the slag discharge port 7 during filtration, a sealing strip is provided on the mating surface of the sealing plate 4 and the slag discharge port 7. The sealing strip is made of a material that is resistant to cutting fluid corrosion and has good elasticity. It can tightly fill the gap between the two to ensure the sealing effect, while reducing wear between the sealing plate 4 and the slag discharge port 7 and extending the service life of the components. This solves the problem of decreased sealing performance caused by improper assembly after manual cleaning in the prior art.

[0039] To optimize solid-liquid separation and facilitate the accumulation of filter residue at the discharge port 7, the centrifuge cylinder 1 is divided into a discharge section 10 and a collection section 11, which are integrally formed. The inner diameter of the collection section 11 gradually decreases from top to bottom, forming an inverted conical slope. This structural design fully utilizes centrifugal force, causing solid impurities in the cutting fluid to slide downwards along the slope of the collection section 11 under centrifugal force, eventually accumulating in the discharge section 10 below, facilitating subsequent discharge through the discharge port 7. The discharge section 10 is cylindrical, connected to the lower part of the collection section 11, and its inner diameter is consistent with the lower inner diameter of the collection section 11. Several discharge ports 7 are evenly distributed on the cylinder wall of the discharge section 10 to ensure uniform discharge of filter residue and prevent excessive accumulation of filter residue in certain areas. The inlet of the extraction pipe 2 is located at the upper part of the collection section 11. Since the collection section 11 is sloping, the filter residue will accumulate downwards along the slope, while the purified liquid will concentrate in the upper area of ​​the collection section 11. A relatively long vertical distance is formed between the liquid surface and the filter residue, effectively preventing the filter residue from mixing in when the extraction pipe 2 extracts the liquid, further improving the purity of the purified cutting fluid. In the background art, in traditional cylindrical centrifuges 1, the cutting fluid and filter residue will simultaneously and rapidly approach the cylinder wall during high-speed rotation, causing the filter residue and liquid to mix together, making it difficult to extract the liquid. This invention effectively solves this problem by setting the centrifuge 1 as a combination of the collection section 11 and the slag discharge section 10, improving both the solid-liquid separation efficiency and ensuring the stability of the liquid extraction.

[0040] like Figure 4 As shown, to further improve slag discharge efficiency and prevent filter residue from accumulating and clogging near the slag discharge port 7, the slag discharge port 7 is designed in a funnel shape, with the larger diameter section of the funnel located on the inner wall of the slag discharge section 10 and the smaller diameter section located on the outer wall of the slag discharge section 10. This structural design allows the filter residue to quickly enter the slag discharge port 7 from the larger diameter section under centrifugal force, and then gradually converge towards the opening of the slag discharge port 7 through the inclined inner wall of the slag discharge port 7, so that it can be quickly discharged when the slag discharge port 7 is opened, reducing the residence time of the filter residue inside the slag discharge port 7. At the same time, the junction of two adjacent slag discharge ports 7 is knife-shaped on the inner wall of the slag discharge section 10. This design can prevent the filter residue from staying and accumulating at the junction of adjacent slag discharge ports 7, so that the filter residue can smoothly gather towards the smaller diameter end of the slag discharge port 7, ensuring that the filter residue can be quickly and thoroughly discharged after the slag discharge port 7 is opened, avoiding the problem of poor slag discharge caused by filter residue clumping and adhesion, and solving the drawback of the vicious cycle caused by untimely or incomplete cleaning of filter residue in the background technology.

[0041] To prevent filter residue from being thrown out by centrifugal force during the slag discharge process and scattering around the equipment, causing environmental pollution and wear on equipment components, an annular baffle 12 is installed around the centrifuge cylinder 1 on the support plate 5. The baffle 12 is coaxially arranged with the centrifuge cylinder 1, and its inner diameter is larger than the outer diameter of the slag discharge section 10. It can fully cover the discharge range of the slag discharge port 7, so that the filter residue discharged from the slag discharge port 7 is effectively blocked by the baffle 12, which facilitates the subsequent centralized collection and treatment of the filter residue. At the same time, the height of the baffle 12 is higher than the height of the slag discharge section 10, which can effectively block the filter residue thrown out at high speed, prevent the filter residue from splashing onto other moving parts of the equipment, reduce component wear, and lower equipment maintenance costs.

[0042] To reduce friction during the rotation of centrifuge cylinder 1, lower energy consumption, and ensure the stability of centrifuge cylinder 1's rotation, a support ring 13 is provided on the support plate 5. The support ring 13 is coaxially arranged with centrifuge cylinder 1, and several balls 14 are evenly embedded in its top along the circumference. The balls 14 can roll freely, and the bottom of centrifuge cylinder 1 is supported on the balls 14. When centrifuge cylinder 1 rotates at high speed, rolling friction is formed between the bottom of centrifuge cylinder 1 and the balls 14. Compared with traditional sliding friction, the friction force of rolling friction is greatly reduced, which not only reduces the energy consumption of the equipment, meeting the requirements of energy conservation and consumption reduction, but also reduces the wear of the bottom of centrifuge cylinder 1 and support plate 5, extending the service life of the equipment. At the same time, the evenly distributed balls 14 can provide stable support for centrifuge cylinder 1, preventing swaying during the rotation of centrifuge cylinder 1, ensuring uniform distribution of centrifugal force, improving the solid-liquid separation effect, and solving the problem of frequent start-stop exacerbating equipment energy consumption and component wear in the background technology.

[0043] To further optimize solid-liquid separation and prevent the cutting fluid to be filtered from directly entering the center of the centrifuge cylinder 1, which would lead to incomplete separation of filter residue, two branch pipes 15 are installed at the end of the liquid inlet pipe 3, making the end of the liquid inlet pipe 3 Y-shaped. The two branch pipes 15 are symmetrically arranged and extend towards the cylinder wall of the centrifuge cylinder 1, with their openings facing the inner wall of the centrifuge cylinder 1. During operation, the cutting fluid to be filtered is transported through the liquid inlet pipe 3 to the two branch pipes 15, and then directly transported by the branch pipes 15 to the vicinity of the inner wall of the centrifuge cylinder 1. This ensures that the cutting fluid is close to the cylinder wall of the centrifuge cylinder 1 from the beginning, away from the central area of ​​the centrifuge cylinder 1. Since the centrifugal force in the central area of ​​the centrifuge cylinder 1 is relatively small, if the cutting fluid directly enters the central area, the fine filter residue may not be fully separated due to insufficient centrifugal force, thus mixing into the clear liquid and affecting the purification effect. The Y-shaped branch pipe design 15 effectively avoids this problem, allowing the cutting fluid to quickly achieve solid-liquid separation under the action of centrifugal force, improving filtration efficiency and purification purity.

[0044] Because the centrifuge drum 1 rotates at high speed, to avoid the fixed setting of the liquid addition pipe 3 from obstructing the liquid rotation and causing turbulence, the liquid addition pipe 3 is divided into two parts: a fixed pipe 16 and a rotating pipe 17. Two branch pipes 15 are located at the ends of the rotating pipe 17, which is connected to the fixed pipe 16 via a rotary joint. The rotary joint enables relative rotation between the fixed pipe 16 and the rotating pipe 17 while ensuring a tight seal between them to prevent cutting fluid leakage. During operation, the rotation of the centrifuge drum 1 drives the rotating pipe 17 to rotate synchronously. The rotating pipe 17 and the fixed pipe 16 rotate relative to each other via the rotary joint, ensuring a continuous and stable supply of cutting fluid to the centrifuge drum 1 while preventing the fixed setting of the liquid addition pipe 3 from obstructing the liquid rotation and causing turbulence. This further prevents filter residue from mixing into the clear liquid under turbulent conditions.

[0045] To ensure smooth opening and closing of the sealing plate 4 and avoid violent impact when the push plate 8 contacts the sealing plate 4, the middle of the push plate 8 is higher than the sides, giving it a sinusoidal outline. This arc-shaped design allows for gradual contact and separation between the push plate 8 and the sealing plate 4. When the sealing plate 4 rotates above the push plate 8, the arc-shaped surface of the push plate 8 slowly pushes the sealing plate 4 upwards, preventing damage to the sealing plate 4, the sliding groove, or the return spring 6 from sudden impact. When the sealing plate 4 leaves the push plate 8, it also smoothly returns to its original position under the action of the return spring 6, ensuring a tight fit between the sealing plate 4 and the slag discharge port 7 and guaranteeing a sealing effect. Simultaneously, the projection of the push plate 8 on the horizontal plane is located within the projection of the sealing plate 4's rotation trajectory on the horizontal plane, ensuring precise contact between the sealing plate 4 and the push plate 8 during rotation. This prevents misalignment that could prevent the sealing plate 4 from being properly pushed open, ensuring a smooth slag discharge process.

[0046] To further improve the opening and closing stability and slag discharge efficiency of the sealing plate 4, a set of driving mechanisms is provided on both opposite sides of the support plate 5. The two sets of driving mechanisms are symmetrically distributed, and each set of driving mechanisms includes a push cylinder 9 and a push plate 8. The positions of the two push plates 8 correspond to the rotation trajectory of the sealing plate 4. During operation, the two sets of driving mechanisms can act synchronously. When the sealing plate 4 rotates above the push plate 8 of either set of driving mechanisms, it can be pushed open by the push plate 8 to open the slag discharge port 7. The symmetrical arrangement of the two sets of driving mechanisms can make the pushing force on the sealing plate 4 more uniform, avoiding the centrifuge 1 being subjected to force on one side due to unilateral pushing, which would affect the stability during high-speed rotation.

[0047] In practice, if the sealing plate 4 can discharge the deposited filter residue by opening once, the time it takes for the two push plates 8 to rise is the same as the time it takes for the centrifuge cylinder 1 to rotate half a turn. Using this as a reference, the rising time of each push plate 8 can be set according to the actual situation.

Claims

1. A cutting fluid centrifugal separator, characterized in that: The centrifuge includes a centrifuge cylinder, a liquid extraction tube, and a liquid addition tube; the centrifuge cylinder has several slag discharge ports on its wall, and each slag discharge port is equipped with a sealing plate; the sealing plate is also equipped with a drive mechanism to open and close the slag discharge port; the liquid extraction tube is inserted into the centrifuge cylinder and is located below the liquid surface of the clear liquid during centrifugation; the liquid addition tube is inserted into the bottom of the centrifuge cylinder. It also includes a support plate disposed below the centrifuge drum; the sealing plate is slidably disposed on the outer wall of the centrifuge drum; when the centrifuge drum rotates at high speed, the centrifuge drum drives the sealing plate on the outer wall to rotate synchronously; the sealing plate is equipped with a return spring so that the return spring pushes the sealing plate to close the slag discharge port; The driving mechanism includes a push cylinder and a push plate connected to the push cylinder, so that the push cylinder pushes the push plate to rise or fall; the push cylinder and the push plate are both disposed on the support plate and cooperate with the sealing plate, so that when the push plate is raised, it can push the sealing plate to open the slag discharge port. The centrifuge cylinder includes a slag discharge section and a collection section; the inner diameter of the collection section gradually decreases from bottom to top; the slag discharge section is cylindrical and connected to the lower part of the collection section; a plurality of slag discharge ports are provided in the slag discharge section; the inlet of the liquid extraction pipe is located in the upper part of the collection section. The slag discharge port is funnel-shaped with its large diameter section located on the inner wall of the slag discharge section; the junction of two adjacent slag discharge ports is located on the inner wall of the slag discharge section and is blade-shaped. The support plate is also provided with a support ring; a number of balls are evenly arranged on the top of the support ring along its circumference, so that the bottom of the centrifuge cylinder is supported by the number of balls. A chute is provided on the outer wall of the centrifuge tube (1) at the position corresponding to the slag discharge port (7). The sealing plate (4) is adapted to be embedded in the chute and can slide up and down along the chute to realize the opening and closing of the slag discharge port (7).

2. The cutting fluid centrifugal separator according to claim 1, characterized in that: The support plate is also provided with an annular baffle around the centrifuge cylinder so that the filter residue discharged from the slag discharge port is blocked by the baffle.

3. The cutting fluid centrifugal separator according to claim 2, characterized in that: The end of the liquid addition tube is provided with two branch tubes so that the end of the liquid addition tube is Y-shaped; the two branch tubes extend towards the wall of the centrifuge cylinder.

4. The cutting fluid centrifugal separator according to claim 3, characterized in that: The liquid addition tube includes a fixed tube and a rotating tube; the branch tube is disposed on the rotating tube; the rotating tube is connected to the fixed tube through a rotary joint.

5. The cutting fluid centrifugal separator according to claim 4, characterized in that: The middle part of the push plate is higher than the two sides, so that the outline of the push plate is sinusoidal; the projection of the push plate on the horizontal plane is located inside the projection of the sealing plate's rotation trajectory on the horizontal plane.

6. The cutting fluid centrifugal separator according to claim 5, characterized in that: A set of drive mechanisms is provided on both opposite sides of the support plate.

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