A recovery device and method for recycling machining cutting fluid

Abstract

The application relates to the technical field of waste liquid treatment, and discloses a recovery device and method for recycling machining cutting liquid, which comprises a horizontal screw centrifuge composed of a machine frame and a machine cover, a multistage filter box is arranged at the rear side of the horizontal screw centrifuge, an ultrafiltration membrane assembly is arranged at the left side of the multistage filter box, and an ion exchange unit is arranged at the left side of the ultrafiltration membrane assembly. The heat treatment recovery device and method for recycling machining cutting liquid can effectively solve the problems in the prior art, i.e. the physical filtration of the existing cutting liquid recovery device can only intercept large-particle-size particles, the solid-liquid separation effect is poor, the cutting liquid is continuously enriched, the viscosity is increased, the performance is decreased, silicon wafer scratches and edge collapse defects are caused, the continuous operation time of the recovery equipment is short, the recovery equipment needs to be frequently stopped for manual cleaning and maintenance, core separation components are difficult to disassemble and maintain, the maintenance cost is high, the large-scale continuous production demand cannot be met, and different batches of cutting liquid are prone to cross contamination, thereby reducing the quality and stability of the recovered liquid.

Description

Technical Field

[0001] This invention relates to the field of waste liquid treatment technology, and specifically to a recycling device and method for processing and cutting fluid. Background Technology

[0002] Diamond wire cutting is a core process for processing hard and brittle materials such as semiconductor-grade single-crystal silicon and wafers. The cutting fluid plays a crucial role in cooling, lubrication, chip removal, and rust prevention, and its performance directly determines the lifespan of the cutting wire, the surface quality of the silicon wafer, and production efficiency. With the explosive growth of the photovoltaic industry, the consumption of diamond wire cutting fluid is enormous, making its efficient recycling essential for reducing production costs and achieving green industrial development. Currently, the traditional recycling processes commonly used in the industry are essentially simple combinations of physical filtration and ion purification. However, due to the significant differences in characteristics between the nano-sized silicon powder and diamond micropowder in the diamond wire cutting waste fluid and the effective components of the cutting fluid, core problems exist such as incomplete solid-liquid separation, severe loss of effective components, and unstable performance of the recovered fluid.

[0003] In response to this, this application designs a recycling device and method for processing cutting fluid. In existing cutting fluid recycling devices, the physical filtration stage can only retain larger particles, and the solid-liquid separation effect needs to be improved. A large number of nano- and submicron-sized ultrafine silicon powder and diamond micro powder cannot be removed, and they will continuously accumulate in the cutting fluid, leading to increased viscosity, decreased performance, and defects such as silicon wafer line marks and edge chipping. In addition, the continuous operation time of the recycling equipment is short, requiring frequent shutdowns for manual cleaning and maintenance. The core separation components are difficult to disassemble and assemble, and the maintenance time is long and costly, which cannot meet the needs of large-scale continuous production. Furthermore, cross-contamination can easily occur between different batches of cutting fluid, reducing the quality and stability of the recycled fluid. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a recycling device and method for processing cutting fluid. This effectively solves the problems in existing technologies where cutting fluid recycling devices can only retain larger particles during the physical filtration stage, resulting in insufficient solid-liquid separation. Large amounts of nano- and submicron-sized ultrafine silicon powder and diamond micropowder cannot be removed, leading to their continuous accumulation in the cutting fluid, increased viscosity, decreased performance, and defects such as silicon wafer line marks and edge chipping. Furthermore, the recycling equipment has a short continuous operating time, requiring frequent shutdowns for manual cleaning and maintenance. The core separation components are difficult to disassemble and reassemble, resulting in long maintenance times and high costs, failing to meet the needs of large-scale continuous production. Additionally, cross-contamination between different batches of cutting fluid can easily occur, reducing the quality and stability of the recycled fluid.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a recycling device for processing cutting fluid, comprising:

[0007] A horizontal screw centrifuge consisting of a frame and a cover; a multi-stage filtration box is installed at the rear of the horizontal screw centrifuge; an ultrafiltration membrane assembly is installed on the left side of the multi-stage filtration box; and an ion exchange unit is installed on the left side of the ultrafiltration membrane assembly.

[0008] The machine frame has a rotating drum in the middle, and sediment sealing plates and liquid phase weir plates are installed at the left and right ends of the rotating drum, respectively. A spiral mandrel is installed inside the rotating drum, and several discharge ports are evenly distributed in a circle on the outer wall of the spiral mandrel. The horizontal screw centrifuge, the rotating drum and the spiral mandrel are all equipped with a drive unit, and the spiral mandrel is also equipped with a spiral separation unit.

[0009] The spiral separation section includes spiral guide frames located on the outer wall of the spiral mandrel on the left and right sides respectively. The spiral guide frames consist of two collars and spiral blades. The pitch of the spiral blades on the left side is designed to gradually increase from left to right, while the pitch of the spiral blades on the right side is greater than that on the left side. Several sediment channels and liquid channels are evenly distributed in a circular pattern on the collars that are close to each other on the left and right spiral guide frames. Quick-release assemblies are provided on both the spiral mandrel and the spiral guide frames.

[0010] Furthermore, the spiral guide frame also includes cleaning scrapers embedded on the spiral blades. Several cleaning scrapers are embedded, and the outer wall of the cleaning scraper is movably attached to the inner wall of the drum. On the left spiral blade, on the smaller pitch section on the left, several spirally evenly distributed guide ribs are integrally embedded. The sediment channel is located on the side close to the inner wall of the drum, and the liquid phase channel is located on the side close to the outer wall of the spiral core. On the right spiral guide frame, the right collar has several circumferentially evenly distributed liquid connection ports corresponding to the liquid phase weir plate.

[0011] Furthermore, sediment discharge outlets and liquid phase discharge outlets are respectively provided on the corresponding sediment sealing plate and liquid phase weir plate on the frame, and main bearings are installed on the opposite sides of the sediment sealing plate and liquid phase weir plate on the frame.

[0012] Furthermore, the drive unit includes pulleys respectively arranged on the left and right sides of the machine cover of the horizontal screw centrifuge. There are two pulleys, one above the other. A stepped drive shaft is mounted on the main bearing and rotates through the corresponding main bearing. The stepped drive shaft on the left rotates through the sediment sealing plate and is fixedly connected to the inner wall of the discharge port. The stepped drive shaft on the right is driven by a differential and is fixedly connected through the liquid phase weir plate. The outer wall of the right stepped drive shaft away from the differential is rotatedly connected to the inner wall of the spiral mandrel.

[0013] Furthermore, the drive unit also includes servo motors mounted on brackets at both ends of the horizontal screw centrifuge. The servo motors are used to drive the corresponding pulleys to rotate. The feed pipe is installed through the middle of the stepped drive shaft on the left side. Several rectangular through holes are evenly distributed in a circle on the outer wall of the right end of the feed pipe. The horizontal screw centrifuge and the feed pipe are jointly provided with a material cavity venting group.

[0014] Furthermore, the quick-release assembly includes several insertion holes on the outer wall of the spiral mandrel corresponding to the left and right collars on the spiral guide frame. On the inner walls of the collars on both sides of the spiral mandrel, L-shaped mounting cavities are provided for each insertion hole. A snap-fit ​​plate is slidably mounted on the inner wall of each L-shaped mounting cavity via a tension spring. Several evenly distributed waist-shaped through holes are provided at the end of the collar near the main bearing, connecting to the corresponding L-shaped mounting cavities. An abutment plate is slidably mounted on the inner wall of each waist-shaped through hole via a tension spring. The abutment plate consists of a waist-shaped plate and a rectangular sleeve plate, with a ball bearing installed at the end of the abutment plate away from the collar. The ball bearing rolls and contacts the corresponding sediment sealing plate or liquid phase weir plate. The end of the snap-fit ​​plate near the abutment plate has a wedge-shaped structure.

[0015] Furthermore, the quick-release assembly also includes several circumferentially evenly distributed alignment magnets embedded at the opposite ends of two collars located close to each other on the left and right spiral guide frames. The magnetic poles of the alignment magnets on the two collars are opposite and magnetically attracted to each other. Several insertion holes on the inner wall of the collar corresponding to the middle of the outer wall of the spiral mandrel are provided with receiving cavities. Wedge-shaped inserts are slidably installed on the inner wall of the receiving cavity by compression springs.

[0016] Furthermore, the material cavity venting assembly includes a piston plate rotatably mounted at the right end of the feed pipe. The outer wall of the piston plate slides against the inner wall of the spiral mandrel. A rectangular groove is provided on the upper left side of the horizontal screw centrifuge. A connecting sleeve plate is slidably mounted on the inner wall of the rectangular groove. Pneumatic push rods for driving the connecting sleeve plate to slide back and forth are symmetrically mounted at the front and rear of the left end of the horizontal screw centrifuge.

[0017] A cutting fluid recycling method using a cutting fluid recycling device includes the following steps:

[0018] S1: Feed pre-acceleration and co-current centrifugal separation stage, using a horizontal screw centrifuge to pre-accelerate, co-current centrifuge, and perform variable pitch solid-phase extrusion dehydration of diamond wire cutting waste liquid;

[0019] S2: The drum is cleaned online and the solid-liquid phase is separated and discharged. The inner wall of the drum is scraped and cleaned online by a horizontal screw centrifuge, and the solid and liquid phases are discharged separately at the same time.

[0020] S3: Multi-stage fine filtration stage, through multi-stage filter boxes to filter the centrifuged clear liquid step by step, to remove residual solid particles with larger diameters.

[0021] S4: Ultrafiltration deep purification stage, the ultrafiltration membrane module performs nano-level filtration of the clear liquid after fine filtration to remove residual nano-sized silicon powder and diamond micro powder.

[0022] S5: Ion exchange desalination and recycling stage. The purified liquid is treated by ion exchange through the ion exchange unit to remove metal ions and harmful impurities, producing a qualified recycled liquid that is returned to the cutting process for recycling.

[0023] The technical solution provided by this invention has the following advantages compared with the prior art:

[0024] This invention provides a recycling device and method for processing and cutting fluid. In the solid-liquid separation and multi-stage purification stage, a servo motor drives the spiral mandrel and the drum to maintain a constant speed difference. The waste liquid to be treated enters the spiral mandrel through the feed pipe and is thrown out to the annular separation chamber from the discharge port. The liquid undergoes solid-liquid separation in the large-pitch sedimentation section. The solid phase is successively dehydrated by compression in the variable-pitch conveying section and deeply dehydrated by the guide rib-enhanced drying section before being discharged from the sediment outlet. The clear liquid flows out from the liquid phase outlet through the liquid connection port. A cleaning scraper continuously removes particles adhering to the inner wall of the drum. The clear liquid is then purified by a multi-stage filter box, an ultrafiltration membrane module, and an ion exchange unit before being reused. This stage solves the problems of incomplete solid-liquid separation and ultrafine particle residue, while also preventing drum scaling and downtime, thus increasing the continuous operation time of the equipment.

[0025] During batch switching and equipment maintenance, after batch processing is completed, the pneumatic push rod drives the piston plate to drain the residual liquid inside the spiral mandrel. During maintenance, the end plates of the drum are removed, the snap-fit ​​plate is automatically unlocked, and the spiral guide frame can be removed by rotating and pulling. During installation, the alignment magnet automatically engages and positions the device, and the end plates are automatically locked after installation. The device can then be reinstalled and run under no-load conditions. This can solve the problem of cross-contamination of cutting fluids from different batches, and at the same time, it enables tool-free quick disassembly and assembly of core separation components, significantly shortening maintenance time and reducing costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0027] Figure 1 This is a process flow diagram of the cutting fluid recovery method in an embodiment of the present invention;

[0028] Figure 2 This is a three-dimensional structural diagram of the horizontal screw centrifuge, multi-stage filter box, ultrafiltration membrane assembly and ion exchange unit in an embodiment of the present invention;

[0029] Figure 3 This is a three-dimensional structural diagram of the horizontal screw centrifuge in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of a partial three-dimensional cross-section of the sediment sealing plate, liquid phase weir plate, and spiral mandrel in an embodiment of the present invention;

[0031] Figure 5 This is a three-dimensional structural diagram of the frame, sediment discharge port, and liquid phase discharge port in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the three-dimensional separation of the drum and the spiral mandrel in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the three-dimensional separation of the feed pipe, spiral mandrel, and spiral guide frame in an embodiment of the present invention;

[0034] Figure 8 This is a first-view structural schematic diagram of a three-dimensional partial cross-section of the spiral mandrel and spiral guide frame in an embodiment of the present invention;

[0035] Figure 9 For the present invention Figure 8 A magnified structural diagram of section X in the middle;

[0036] Figure 10 This is a second-view structural schematic diagram of a three-dimensional partial cross-section of the spiral mandrel and spiral guide frame in an embodiment of the present invention;

[0037] Figure 11 For the present invention Figure 10 A magnified structural diagram of the area at point Y in the middle;

[0038] Figure 12 This is a schematic diagram of the three-dimensional separation of the spiral mandrel, sediment sealing plate, and quick-release assembly in an embodiment of the present invention;

[0039] Figure 13 This is a schematic diagram of the three-dimensional separation of the spiral mandrel, liquid phase weir plate, and quick-release assembly in an embodiment of the present invention.

[0040] The labels in the diagram represent: 1. Horizontal screw centrifuge; 2. Multistage filter box; 3. Ultrafiltration membrane module; 4. Ion exchange unit; 5. Frame; 51. Cover; 52. Sediment outlet; 53. Liquid phase outlet; 54. Main bearing; 6. Drum; 61. Sediment sealing plate; 62. Liquid phase weir plate; 7. Spiral mandrel; 71. Discharge port; 8. Drive unit; 81. Pulley; 82. Stepped drive shaft; 83. Differential; 84. Servo motor; 85. Feed pipe; 86. Material chamber evacuation assembly; 861. Piston plate; 862. 863. Rectangular groove; 864. Connecting sleeve; 9. Pneumatic push rod; 9. Spiral separation section; 91. Spiral guide frame; 911. Collar ring; 912. Spiral blade; 913. Cleaning scraper; 92. Guide rib; 93. Sediment channel; 94. Liquid phase channel; 95. Liquid phase connection port; 96. Quick release assembly; 961. Insertion hole; 962. L-shaped mounting cavity; 963. Snap-fit ​​plate; 964. Waist-shaped through hole; 965. Abutment slide plate; 966. Ball bearing; 967. Alignment magnet; 968. Receiving cavity; 969. Wedge-shaped insert plate. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] The present invention will be further described below with reference to embodiments.

[0043] Example:

[0044] Please see Figures 2-13 The present invention provides a technical solution: a recycling device for processing cutting fluid, comprising:

[0045] The horizontal screw centrifuge 1 consists of a frame 5 and a cover 51. A multi-stage filter box 2 is provided at the rear of the horizontal screw centrifuge 1. An ultrafiltration membrane assembly 3 is provided on the left side of the multi-stage filter box 2. An ion exchange unit 4 is provided on the left side of the ultrafiltration membrane assembly 3. The horizontal screw centrifuge 1, the multi-stage filter box 2, the ultrafiltration membrane assembly 3 and the ion exchange unit 4 are connected by a conveying pipe.

[0046] The frame 5 has a rotating drum 6 in the middle. The outer wall of the left end of the rotating drum 6 has several solid outlets that are evenly distributed in a circle. The left and right ends of the rotating drum 6 are respectively equipped with a sediment sealing plate 61 and a liquid phase weir plate 62. The right end of the liquid phase weir plate 62 has several overflow ports that are evenly distributed in a circle. The rotating drum 6 has a spiral mandrel 7 inside. The outer wall of the spiral mandrel 7 has several discharge ports 71 that are evenly distributed in a circle. The horizontal screw centrifuge 1, the rotating drum 6 and the spiral mandrel 7 are all equipped with a drive unit 8. The spiral mandrel 7 is also equipped with a spiral separation unit 9.

[0047] The spiral separation section 9 includes spiral guide frames 91 located on the outer wall of the spiral core 7 on the left and right sides respectively. The spiral guide frame 91 is composed of two collars 911 and spiral blades 912. The pitch of the spiral blade 912 on the left side is designed to gradually increase from left to right, and the pitch of the spiral blade 912 on the right side is greater than that on the left side. Several sediment channels 93 and liquid phase channels 94 are evenly distributed in a circle on the collars 911 that are close to each other on the left and right spiral guide frames 91. Quick release assembly 96 is provided on both the spiral core 7 and the spiral guide frame 91.

[0048] The spiral guide frame 91 also includes cleaning scrapers 913 embedded on the spiral blades 912. Several cleaning scrapers 913 are embedded and are evenly distributed around the circumference. The outer wall of the cleaning scraper 913 is movably attached to the inner wall of the drum 6. Several spirally evenly distributed guide ribs 92 are integrally embedded on the smaller pitch section on the left side of the spiral blade 912. The sediment channel 93 is located on the side close to the inner wall of the drum 6, and the liquid phase channel 94 is located on the side close to the outer wall of the spiral core 7. Several liquid connection ports 95 are evenly distributed around the circumference on the right side collar 911 of the right spiral guide frame 91, corresponding to the liquid phase weir plate 62. The liquid connection ports 95 are arc-shaped.

[0049] Sediment outlet 52 and liquid outlet 53 are respectively provided on the frame 5 for the corresponding sediment sealing plate 61 and liquid phase weir plate 62. Main bearings 54 are installed on the opposite sides of the sediment sealing plate 61 and liquid phase weir plate 62 on the frame 5.

[0050] The drive unit 8 includes pulleys 81 respectively arranged on the left and right sides of the casing 51 on the horizontal screw centrifuge 1. There are two pulleys 81, one upper and one lower, which are connected by a transmission belt. A stepped drive shaft 82 is mounted on the main bearing 54 and rotates through the corresponding main bearing 54. The stepped drive shaft 82 on the left rotates through the sediment sealing plate 61 and is fixedly connected to the inner wall of the discharge port 71. The stepped drive shaft 82 on the right is driven by a differential 83 and is fixedly connected through the liquid phase weir plate 62. The outer wall of the right stepped drive shaft 82 away from the differential 83 is rotatedly connected to the inner wall of the spiral mandrel 7.

[0051] The drive unit 8 also includes servo motors 84 mounted on brackets at both ends of the horizontal screw centrifuge 1. The servo motors 84 are used to drive the corresponding pulleys 81 to rotate. The feed pipe 85 is rotatably installed through the middle of the stepped drive shaft 82 on the left side. Several rectangular through holes are evenly distributed in a circle on the outer wall of the right end of the feed pipe 85. The horizontal screw centrifuge 1 and the feed pipe 85 are jointly provided with a material cavity venting group 86.

[0052] The quick-release assembly 96 includes several insertion holes 961 on the outer wall of the spiral mandrel 7, corresponding to the two left and right collars 911 on the spiral guide frame 91. These insertion holes 961 are evenly distributed circumferentially. On the inner walls of the collars 911 on both sides of the spiral mandrel 7, corresponding to these insertion holes 961, are L-shaped mounting cavities 962. A snap-fit ​​plate 963 is slidably mounted on the inner wall of each L-shaped mounting cavity 962 via a tension spring. Several... A waist-shaped through hole 964 is evenly distributed around the circumference. The waist-shaped through hole 964 is connected to the corresponding L-shaped mounting cavity 962. An abutment plate 965 is slidably installed on the inner wall of the waist-shaped through hole 964 by a tension spring. The abutment plate 965 is composed of a waist-shaped plate and a rectangular sleeve plate. A ball bearing 966 is installed at the end of the abutment plate 965 away from the collar 911. The ball bearing 966 rolls and contacts the corresponding sediment sealing plate 61 or liquid phase weir plate 62. The end of the snap-fit ​​plate 963 near the abutment plate 965 has a wedge-shaped structure.

[0053] The quick-release assembly 96 also includes several circumferentially evenly distributed alignment magnets 967 embedded at the opposite ends of two collars 911 located close to each other on the left and right spiral guide frames 91. The alignment magnets 967 on the two collars 911 have opposite magnetic poles and are magnetically attracted to each other. Several insertion holes 961 on the inner wall of the collars 911 corresponding to the middle of the outer wall of the spiral mandrel 7 are provided with receiving cavities 968. Wedge-shaped insert plates 969 are slidably installed on the inner wall of the receiving cavity 968 by means of compression springs.

[0054] The material chamber venting assembly 86 includes a piston plate 861 rotatably mounted at the right end of the feed pipe 85. The outer wall of the piston plate 861 slides against the inner wall of the spiral spindle 7. A rectangular groove 862 is provided on the upper left side of the horizontal screw centrifuge 1. A connecting sleeve plate 863 is slidably mounted on the inner wall of the rectangular groove 862. Pneumatic push rods 864 for driving the connecting sleeve plate 863 to slide back and forth are symmetrically mounted at the left end of the horizontal screw centrifuge 1.

[0055] In practice:

[0056] First, the horizontal screw centrifuge 1 in this application serves as the core solid-liquid separation unit. It employs the industry-leading and technologically optimal co-current process to achieve efficient separation of nano-sized silicon powder, diamond micropowder, and effective components from monocrystalline / polycrystalline silicon diamond wire cutting fluid, providing a highly clear liquid phase foundation for subsequent multi-stage purification. The spiral separation section 9, through its variable pitch design and guide rib 92 structural design, achieves continuous solid-phase transport and deep dehydration, significantly reducing the solid-phase water content and minimizing the entrainment loss of effective components in the cutting fluid. The quick-release assembly 96 enables tool-free rapid disassembly and assembly of the spiral guide frame 91, drastically shortening equipment maintenance and cleaning time and reducing maintenance costs. The material chamber evacuation assembly 86 completely solves the problem of residual cutting fluid in the discharge chamber of the spiral mandrel 7, avoiding cross-contamination between different batches of cutting fluid and improving the cutting fluid recovery rate.

[0057] Based on the concentration, particle size distribution, and processing volume requirements of the cutting waste liquid to be treated, the speed difference between the drum 6 and the spiral spindle 7 needs to be preset through the differential 83. The structure of using dual servo motors 84 for independent drive in conjunction with the differential 83 can flexibly adapt to cutting waste liquids with different characteristics, avoiding the problems of limited parameter adjustment range and inability to adapt to changes in working conditions in traditional single drive structures. It can also lead to incomplete solid-liquid separation, residue of ultrafine particles, unstable performance of the recovered liquid, and defects such as silicon wafer line marks and edge chipping.

[0058] It should be noted that the insertion hole 961 on the outer wall of the spiral mandrel 7, the L-shaped mounting cavity 962 on the inner wall of the collar 911, the snap-fit ​​plate 963, the contact slide plate 965, the ball bearing 966, and the alignment magnet 967 together form a self-locking quick-release mechanism. When the spiral guide frame 91 is installed in place, the ball bearing 966 at the end of the contact slide plate 965 rolls and contacts the corresponding sediment sealing plate 61 or liquid phase weir plate 62. Under the action of axial thrust, the contact slide plate 965 is pushed to slide into the L-shaped mounting cavity 962, and then the wedge-shaped end face of the snap-fit ​​plate 963 drives the snap-fit ​​plate 963 to insert into the corresponding insertion hole 961, realizing the automatic locking of the spiral guide frame 91 and the spiral mandrel 7; when the equipment is stopped and disassembled... When the drum 6 and the liquid phase weir plate 62 are removed, the ball bearing 966 is disengaged from the sediment sealing plate 61 or the liquid phase weir plate 62. At this time, the sliding plate 965 will cause the ball bearing 966 to pop out towards the side closer to the main bearing 54 under the action of the tension spring. The snap plate 963 will automatically retract into the L-shaped mounting cavity 962 under the tension of the tension spring, and the spiral guide frame 91 can be easily removed. It is worth emphasizing that the collars 911 on the left and right spiral guide frames 91 that are close to each other are magnetically connected by the alignment magnet 967, which can realize automatic alignment during installation. At the same time, the wedge-shaped insert plate 969 is inserted into the insertion hole 961 in the middle of the spiral spindle 7 to further enhance the stability of the connection and prevent loosening during high-speed rotation.

[0059] It should also be noted that the piston plate 861 at the right end of the feed pipe 85, the connecting sleeve plate 863 at the upper end of the horizontal screw centrifuge 1, and the pneumatic push rod 864 can together form a material cavity venting mechanism. After a batch of cutting waste liquid is processed, the pneumatic push rod 864 drives the connecting sleeve plate 863 to slide back and forth, causing the piston plate 861 to move axially back and forth on the inner wall of the spiral mandrel 7, pushing out all the residual cutting liquid in the discharge cavity inside the spiral mandrel 7, and entering the separation chamber for processing through the discharge port 71. The piston plate 861 is made of wear-resistant rubber material, and its outer wall is tightly fitted with the inner wall of the spiral mandrel 7 to ensure that the residual liquid on the inner wall can be completely scraped off, avoiding the residual liquid from deteriorating and contaminating the next batch of cutting liquid.

[0060] In the initial state, the horizontal decanter centrifuge 1 is in a stopped state, the servo motors 84 on both sides are de-energized, and the drum 6 and the spiral mandrel 7 are stationary; the quick-release assembly 96 is in a fully locked state, wherein the two left and right spiral guide frames 91 are firmly fixed to the outer wall of the spiral mandrel 7 by the snap-fit ​​plate 963 and the wedge-shaped insert plate 969, the alignment magnet 967 is in a tightly magnetically attracted state, and the ball bearings 966 at the end of the contact slide plate 965 roll and contact the inner walls of the sediment sealing plate 61 and the liquid phase weir plate 62 respectively; the piston plate 861 is located at the rightmost side of the internal sliding stroke of the spiral mandrel 7, and the connecting sleeve plate 863 is located at... At the far right of the sliding stroke of the rectangular groove 862, the pneumatic push rod 864 is in a fully extended pressure-holding state; the inlet and outlet valves of the multi-stage filter box 2, ultrafiltration membrane module 3 and ion exchange unit 4 are all closed, and the external feed pump and transfer pump are all stopped. In addition, at this time, the drum 6 and the spiral mandrel 7 maintain precise coaxiality under the support of the main bearing 54, without radial runout or axial movement. It should also be noted that the rectangular through hole at the right end of the feed pipe 85 is evenly distributed around the circumference, so that the liquid can be evenly distributed to the inner wall of the spiral mandrel 7, avoiding uneven separation effect caused by excessively high local concentration.

[0061] First, confirm that all valves and pumps are in normal condition. Then, start the servo motors 84 on the left and right sides, which drive the stepped drive shafts 82 on the left and right sides to rotate through the corresponding upper and lower pulleys 81. The left stepped drive shaft 82 will directly drive the spiral spindle 7 to rotate at a standard speed. The right stepped drive shaft 82 will precisely adjust the speed of the drum 6 through the differential 83 to maintain a preset constant speed difference between it and the spiral spindle 7. After the speed of the drum 6 and the spiral spindle 7 stabilizes, open the inlet and outlet valves of the multi-stage filter box 2, the ultrafiltration membrane module 3 and the ion exchange unit 4 in sequence, and start the corresponding external delivery pumps to put the entire recovery system into standby mode.

[0062] During the feeding and centrifugal pre-acceleration stage, the external feed pump is first started to pump the diamond wire cutting waste liquid to be treated into the discharge chamber inside the spiral mandrel 7 through the feed pipe 85. After the cutting waste liquid enters the spiral mandrel 7, it will rotate at high speed with the spiral mandrel 7 and be rapidly accelerated under the action of centrifugal force. It will then be radially thrown out from the discharge port 71, which is evenly distributed in a circle in the middle of the spiral mandrel 7, and enter the annular separation chamber between the drum 6 and the spiral mandrel 7. During this process, several rectangular through holes at the right end of the feed pipe 85 can make the liquid evenly distributed to the spiral mandrel. The inner wall of the shaft 7 and the evenly distributed circumferential outlet 71 ensure that the liquid enters the separation chamber smoothly and avoids turbulence. It is worth emphasizing that the liquid is pre-accelerated in the spiral shaft 7 so that it has a high centrifugal speed when it enters the separation chamber, which shortens the settling time of the particles and improves the separation efficiency. In addition, the feeding method of the co-current horizontal screw centrifuge 1 makes the direction of the liquid and the centrifugal force field consistent, avoiding the disturbance of the settled particles by the counter-current feeding, significantly improving the separation accuracy, and effectively removing nano- and submicron-sized ultrafine particles.

[0063] In the deep solid-liquid separation stage of the large-pitch settling section, the liquid material ejected from the discharge port 71 enters the right-side large-pitch settling section (the area of ​​the right-side spiral guide frame 91). Under the strong centrifugal force, the denser solid particles such as silicon powder and diamond powder rapidly move towards the inner wall of the drum 6, gradually settling onto the inner wall of the drum 6 to form a solid deposition layer; the less dense liquid phase moves towards the central axis of the drum 6 to form a liquid layer, achieving preliminary separation of the solid and liquid phases. The right-side spiral guide frame 91 adopts a large-pitch design, significantly... Increasing the flow area of ​​the liquid phase and reducing its flow resistance allows the liquid phase to pass quickly through the settling zone, avoiding secondary suspension of fine particles caused by liquid phase retention. Specifically, the liquid phase channel 94 on the collar 911 allows the liquid phase to pass freely and flow to the right end of the drum 6, while the sediment channel 93 allows settled coarse particles to pass through and enter the left conveying section. The partitioned design of the liquid phase channel 94 and the sediment channel 93 can achieve preliminary separation of the solid and liquid phases, reduce mutual interference between the two phases, and further improve the separation accuracy.

[0064] In the solid phase conveying and extrusion dehydration stage of the variable pitch conveying section, the solid phase deposited on the inner wall of the drum 6 will be conveyed to the left by the right helical blade 912 under the action of the rotational speed difference between the drum 6 and the helical mandrel 7, and enter the left variable pitch conveying section (the area with a larger pitch on the right side of the left helical blade 912) through the sediment channel 93. Since the pitch of the helical blade 912 on the left helical guide frame 91 gradually increases from left to right, the extrusion pressure on the solid phase gradually increases during the leftward conveying process. The free water in the solid phase gap is continuously squeezed out and moves towards the liquid phase layer. The left helical guide frame 91 adopts a variable pitch design that gradually increases from left to right, so that the extrusion pressure on the solid phase gradually increases during the conveying process, avoiding solid phase blockage caused by sudden pressurization. The smaller pitch section can provide a larger extrusion pressure, which can effectively remove most of the free water in the solid phase gap, reduce the water content of the solid phase, and reduce the entrainment loss of effective components of the cutting fluid. At the same time, the variable pitch design can also improve the solid phase conveying efficiency.

[0065] In the deep dehydration stage of the drying section, the guide ribs 92 enhance the drying process. After initial dehydration, the solid phase continues to be conveyed to the left, entering the left drying section (the area with a smaller pitch on the left side of the left spiral blade 912). The guide ribs 92 embedded on the surface of the spiral blade 912 in the drying section further increase the frictional force on the solid phase, causing the solid phase to tumble and shear during the conveying process, further removing the bound water inside the solid phase and improving the dehydration rate of the solid phase. The guide ribs 92 are evenly distributed in a spiral and are integrated with the spiral blade 912, increasing the contact area and friction between the solid phase and the blade. At the same time, they can promote the tumbling effect of the solid phase to avoid the solid phase adhering to the blade, ensuring the continuity and stability of the conveying process. The strengthening effect of the guide ribs 92 significantly improves the dehydration rate of the solid phase and greatly reduces the loss of effective components in the cutting fluid.

[0066] In the solid-liquid phase discharge stage, the solid phase, after deep dehydration, is finally transported to the left end of the drum 6 and discharged into the sediment discharge outlet 52 through several solid phase outlets on the drum 6, where it is then collected and processed by an external collection device. The separated clear liquid enters the liquid phase weir plate 62 area through several liquid-connecting ports 95 on the right side collar 911. When the liquid phase height exceeds the overflow port height of the liquid phase weir plate 62, it overflows from the overflow port into the liquid phase discharge outlet 53, and then enters the subsequent multi-stage purification unit through the conveying pipe. The liquid-connecting ports 95 adopt an arc-shaped design to increase the flow area between the liquid-connecting ports 95 and several overflow ports on the liquid phase weir plate 62, so that the liquid phase can smoothly enter the overflow area and avoid eddies and disturbances during liquid phase flow. The solid and liquid phases are discharged from the left and right ends respectively to avoid mutual interference.

[0067] During the online cleaning stage of the inner wall of the drum 6, a constant speed difference exists between the drum 6 and the spiral spindle 7 throughout the separation process. Several cleaning scrapers 913, evenly distributed in a circular pattern and embedded on the spiral blades 912, move in a circular motion relative to the inner wall of the drum 6, continuously scraping away the solid particles adhering to the inner wall of the drum 6, keeping the inner wall of the drum 6 clean. The outer wall of the cleaning scraper 913 is in close contact with the inner wall of the drum 6 to ensure the scraping effect. The online cleaning mechanism completely solves the problem of impurities easily adhering to the inner wall of the drum 6 in traditional horizontal screw centrifuges, avoiding the decline in dehydration effect, equipment dynamic balance damage, and start-up shaking caused by the thickening of the adhesion layer. The cleaning of the inner wall of the drum 6 can be achieved without stopping the machine, significantly improving the continuous operation time and production efficiency of the equipment and reducing maintenance costs.

[0068] In addition, the clear liquid discharged from the liquid phase outlet 53 of the horizontal screw centrifuge 1 will enter the multi-stage filter box 2 through the delivery pipe to further intercept larger particles; the filtered clear liquid enters the ultrafiltration membrane module 3 to remove nano-sized silicon powder and diamond micro powder, and finally enters the ion exchange unit 4 to remove metal ions and harmful impurities in the cutting fluid. After the above four-stage purification treatment, the cutting fluid can meet the new fluid standard in all performance indicators and can be directly returned to the cutting process for recycling.

[0069] It is worth emphasizing that when the cleaning scraper 913 and the spiral blade 912 show obvious wear, the spiral guide frame 91 needs to be disassembled, maintained or replaced. This quick-release assembly 96 can be disassembled and assembled without any special tools.

[0070] In the quick disassembly and maintenance phase of the quick-release assembly 96, first, complete the equipment shutdown and safety preparation work, then remove the fixing bolts of the machine cover 51, use a crane to remove the upper cover, remove the connecting flange between the feed pipe 85 and the left stepped drive shaft 82, take out the feed pipe 85 assembly, then remove the fixing bolts and positioning pins on the main bearing seats 54 at both ends, lift the drum 6-spiral spindle 7 assembly off the frame 5 as a whole, place it horizontally on the pre-prepared sleepers, ensuring that the placement is stable and without shaking, and then remove the sediment sealing plate 6. 1. After separating the two spiral guide frames 91 from the liquid phase weir plate 62, the ball bearings 966 on the several contact slide plates 965 lose the sealing and limiting effect of the sediment sealing plate 61 or the liquid phase weir plate 62. Under the action of the tension spring, they will slide along the waist-shaped through hole 964 to the outside of the collar 911 to return to their original position, releasing the wedge-shaped pushing effect on the snap-fit ​​plate 963. Under the tension of the tension spring, the snap-fit ​​plate 963 will automatically retract into the L-shaped mounting cavity 962 and completely disengage from the insertion hole 961 on the outer wall of the spiral mandrel 7.

[0071] Specifically, hold the roots of the spiral blades 912 of the left and right spiral guide frames 91 with both hands, and rotate the left and right spiral guide frames 91 sequentially toward the wedge-shaped structure side of the wedge-shaped insert plate 969. Several wedge-shaped insert plates 969 will be squeezed back into the corresponding receiving cavity 968 by the spiral core shaft 7 to avoid it, and release the lock on the middle insertion hole 961 of the spiral core shaft 7. Then, apply axial pulling force in the opposite direction at the same time to overcome the magnetic attraction force between the positioning magnets 967, so that the two collars 911 separate from each other. At this time, the left and right spiral guide frames 91 can be completely removed from the right end of the spiral core shaft 7 in sequence for cleaning, inspection or replacement.

[0072] When installing the quick-release assembly 96, first press down on several wedge-shaped inserts 969 on the collar 911 to retract them into the corresponding receiving cavities 968 for clearance. Then, align the two collars 911 on the left and right spiral guide frames 91 with the spiral mandrel 7 and slowly push them axially toward the center. During this process, when the collars 911 on the left and right spiral guide frames 91 approach each other, the magnetic attraction force generated by the alignment magnet 967 will automatically attract the two collars 911 to accurately align and fit tightly. At the same time, the wedge-shaped inserts 969 at the opposite ends of the two collars 911 can automatically insert into the insertion holes 961 in the middle of the spiral mandrel 7 under the elastic force of the compression spring, further enhancing the stability of the connection and completing the installation and self-locking of the right spiral guide frame 91. Then, install the drum 6, sediment sealing plate 61, and liquid phase weir plate 62. Ensure that the balls 966 on several contact slides 965 roll and contact the corresponding sediment sealing plate 61 or liquid phase weir plate 62 again. At this time, after the contact slides 965 are squeezed, the inner end of the contact slides 965 will be pushed by the wedge-shaped surface of the snap plate 963 to overcome the tension of the tension spring and move towards the middle of the spiral mandrel 7 until it is inserted into the corresponding insertion hole 961, realizing the automatic locking of the spiral guide frame 91 and the spiral mandrel 7. Then the drum 6 and the spiral mandrel 7 assembly can be hoisted back to the frame 5 as a whole. Align the positioning pin holes and install the main bearings 54 seats at both ends, tighten the fixing bolts, then install the feed pipe 85 assembly, connect the feed flange, hoist the cover 51 and tighten the fixing bolts, finally connect the main power supply of the equipment, start the servo motor 84 for no-load test run, check whether the equipment runs smoothly, and whether there is any abnormal vibration or noise. After confirming that the quick release assembly 96 is firmly connected and not loose, it can be put into normal use.

[0073] Please see Figure 1 Another aspect of the present invention provides a cutting fluid recycling method for a processing cutting fluid recycling device, comprising the following steps:

[0074] S1: Feeding pre-acceleration and co-current centrifugal separation stage, the diamond wire cutting waste liquid is pre-accelerated, co-current centrifuged and dehydrated by variable pitch solid-phase extrusion through horizontal screw centrifuge 1;

[0075] S2: In the online cleaning and solid-liquid phase separation and discharge stage of the drum 6, the inner wall of the drum is scraped and cleaned online by the horizontal screw centrifuge 1, and the solid and liquid phases are discharged separately at the same time.

[0076] S3: Multi-stage fine filtration stage, through multi-stage filter box 2, the centrifuged clear liquid is filtered step by step to remove residual solid particles with larger diameters.

[0077] S4: Ultrafiltration deep purification stage, the ultrafiltration membrane module 3 performs nano-level filtration of the clear liquid after fine filtration to remove residual nano-sized silicon powder and diamond micro powder.

[0078] S5: Ion exchange desalination and recycling stage. The purified liquid is treated by ion exchange unit 4 to remove metal ions and harmful impurities, and the qualified recycled liquid is returned to the cutting process for recycling.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A recycling device for processing cutting fluid, characterized in that, include: A horizontal screw centrifuge (1) is composed of a frame (5) and a cover (51). A multi-stage filter box (2) is provided on the rear side of the horizontal screw centrifuge (1). An ultrafiltration membrane assembly (3) is provided on the left side of the multi-stage filter box (2). An ion exchange unit (4) is provided on the left side of the ultrafiltration membrane assembly (3). The frame (5) is provided with a rotating drum (6) in the middle. The left and right ends of the rotating drum (6) are respectively equipped with a sediment sealing plate (61) and a liquid phase weir plate (62). The rotating drum (6) is provided with a spiral mandrel (7). The outer wall of the spiral mandrel (7) is provided with several discharge ports (71) evenly distributed in a circle. The horizontal screw centrifuge (1), the rotating drum (6) and the spiral mandrel (7) are all provided with a drive unit (8). The spiral mandrel (7) is also provided with a spiral separation unit (9). The spiral separation section (9) includes spiral guide frames (91) located on the outer wall of the spiral core (7) on the left and right sides respectively. The spiral guide frame (91) is composed of two left and right collars (911) and spiral blades (912). The pitch of the spiral blade (912) on the left side is designed to gradually increase from left to right. The pitch of the spiral blade (912) on the right side is greater than that of the spiral blade (912) on the left side. Several sediment channels (93) and liquid phase channels (94) are evenly distributed in a circle on the collars (911) that are close to each other on the left and right spiral guide frames (91). Quick release assembly (96) is provided on both the spiral core (7) and the spiral guide frame (91).

2. The recycling device for processing cutting fluid according to claim 1, characterized in that: The spiral guide frame (91) also includes a cleaning scraper (913) embedded on the spiral blade (912). Several cleaning scrapers (913) are embedded. The outer wall of the cleaning scraper (913) is movably attached to the inner wall of the drum (6). Several spirally evenly distributed guide ribs (92) are integrally embedded on the smaller pitch section on the left side of the left spiral blade (912). The sediment channel (93) is located on the side close to the inner wall of the drum (6). The liquid phase channel (94) is located on the side close to the outer wall of the spiral core (7). The right collar (911) on the right side of the spiral guide frame (91) has several circumferentially evenly distributed liquid connection ports (95) corresponding to the liquid phase weir plate (62).

3. The recycling device for processing cutting fluid according to claim 1, characterized in that: The frame (5) is provided with sediment outlet (52) and liquid outlet (53) respectively on the corresponding sediment sealing plate (61) and liquid phase weir plate (62). Main bearings (54) are installed on the opposite sides of the sediment sealing plate (61) and liquid phase weir plate (62) on the frame (5).

4. The recycling device for processing cutting fluid according to claim 3, characterized in that: The drive unit (8) includes pulleys (81) respectively arranged on the left and right sides of the machine cover (51) of the horizontal screw centrifuge (1). The pulleys (81) are provided with two main bearings (54) and a stepped drive shaft (82) is mounted on the corresponding main bearing (54). The stepped drive shaft (82) on the left side is rotatably connected to the sediment sealing plate (61) and fixedly connected to the inner wall of the discharge port (71). The stepped drive shaft (82) on the right side is connected to the differential (83) and fixedly connected to the liquid phase weir plate (62). The outer wall of the right step drive shaft (82) away from the differential (83) is rotatably connected to the inner wall of the spiral mandrel (7).

5. A recycling device for processing cutting fluid according to claim 4, characterized in that: The drive unit (8) also includes servo motors (84) mounted on brackets at both ends of the horizontal screw centrifuge (1). The servo motors (84) are used to drive the corresponding pulleys (81) to rotate. The feed pipe (85) is installed through the middle of the stepped drive shaft (82) on the left side. Several rectangular through holes are evenly distributed in a circle on the outer wall of the right end of the feed pipe (85). The horizontal screw centrifuge (1) and the feed pipe (85) are jointly provided with a material cavity venting group (86).

6. The recycling device for processing cutting fluid according to claim 1, characterized in that: The quick-release assembly (96) includes insertion holes (961) on the outer wall of the spiral mandrel (7) corresponding to the left and right collars (911) on the spiral guide frame (91). Several insertion holes (961) are provided. On the inner wall of the collars (911) on the left and right sides of the spiral mandrel (7), L-shaped mounting cavities (962) are provided corresponding to several insertion holes (961). A snap-fit ​​plate (963) is slidably installed on the inner wall of the L-shaped mounting cavity (962) by means of a tension spring. Several evenly distributed circumferential holes are provided at the end of the collar (911) near the main bearing (54). The waist-shaped through hole (964) is connected to the corresponding L-shaped mounting cavity (962). The inner wall of the waist-shaped through hole (964) is slidably mounted with a tension spring and a sliding plate (965). The sliding plate (965) is composed of a waist-shaped plate and a rectangular sleeve plate. A ball bearing (966) is installed at the end of the sliding plate (965) away from the collar (911). The ball bearing (966) rolls and contacts the corresponding sediment sealing plate (61) or liquid phase weir plate (62). The end of the snap-fit ​​plate (963) near the sliding plate (965) is a wedge-shaped structure.

7. A recycling device for processing cutting fluid according to claim 6, characterized in that: The quick-release assembly (96) also includes several circumferentially evenly distributed aligning magnets (967) embedded at the opposite ends of two collars (911) located close to each other on the left and right spiral guide frames (91). The aligning magnets (967) on the two collars (911) have opposite magnetic poles and are magnetically attracted to each other. Several insertion holes (961) on the inner wall of the collar (911) corresponding to the middle of the outer wall of the spiral mandrel (7) are provided with receiving cavities (968). A wedge-shaped insert plate (969) is slidably installed on the inner wall of the receiving cavity (968) by means of a compression spring.

8. A recycling device for processing cutting fluid according to claim 5, characterized in that: The material chamber venting assembly (86) includes a piston plate (861) rotatably mounted on the right end of the feed pipe (85). The outer wall of the piston plate (861) is slidably attached to the inner wall of the spiral mandrel (7). A rectangular groove (862) is provided on the upper left side of the horizontal screw centrifuge (1). A connecting sleeve plate (863) is slidably mounted on the inner wall of the rectangular groove (862). Pneumatic push rods (864) for driving the connecting sleeve plate (863) to slide back and forth are symmetrically mounted on the left end of the horizontal screw centrifuge (1).

9. The cutting fluid recovery method of the processing cutting fluid recycling device according to claim 1, characterized in that: Includes the following steps: S1: Feeding pre-acceleration and co-current centrifugal separation stage, using a horizontal screw centrifuge (1) to pre-accelerate, co-current centrifuge and variable pitch solid phase extrusion dewatering of diamond wire cutting waste liquid; S2: In the online cleaning and solid-liquid phase separation discharge stage of the drum (6), the inner wall of the drum is scraped and cleaned online by the horizontal screw centrifuge (1), and the solid and liquid phases are discharged separately at the same time. S3: Multi-stage fine filtration stage, the centrifuged clear liquid is filtered step by step through the multi-stage filter box (2) to intercept the residual solid particles with larger diameters; S4: Ultrafiltration deep purification stage, the nano-level filtration of the clear liquid after fine filtration is carried out through the ultrafiltration membrane module (3) to remove residual nano-level silicon powder and diamond micro powder; S5: Ion exchange desalination and recycling stage, the ion exchange unit (4) is used to treat the purified liquid by ion exchange to remove metal ions and harmful impurities, produce qualified recycled liquid and return it to the cutting process for recycling.

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