Multi-stage screening device for injection molding titanium alloy powder and control method
Through multi-stage screening devices and control methods, the problem of reducing screening accuracy of titanium alloy powder is solved, and higher screening accuracy and equipment efficiency are achieved, reducing surface defects of the parts.
Patent Information
- Application Number
- CN202510881963.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2045-06-27
AI Technical Summary
In the prior art, after a long time of use, the screening accuracy of the titanium alloy powder is reduced, resulting in the doping of powder of more than 40 μm in the 0-20 μm screening link, affecting the surface polishing of the product.
Using a multi-stage screening device and control method, the first screening network and the second screening network are screened to below 90 μm and 56 μm, the power of the grader is adjusted to 41 μm, 21 μm and 20 μm, and the powder is conveyed to the grader by using a fan for further screening, combining ultrasonic vibration and air cooler cooling to reduce powder agglomeration.
The screening accuracy is improved, the possibility of powder above 40μm entering MIN powder is reduced, the risk of pitting during surface polishing of the parts is reduced, and the efficiency and accuracy of the screening equipment is improved.
Smart Images
Figure CN120502498A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of alloy powder screening, and in particular to a multi-stage screening device and control method for titanium alloy powder for injection molding. Background Art
[0002] MIM powder (titanium alloy powder for metal injection molding) boasts high strength, low density, excellent corrosion resistance, and biocompatibility, making it widely used in aerospace, medical devices, electronic components, and the automotive industry. Due to the increasing demand for surface finish in the 3C (Consumer Electronics) industry, the control of coarse particles in MIM powder is becoming increasingly stringent. The particle size distribution of MIM powder is generally 0-20μm.
[0003] During screening, the pure powder (referring to the original metal powder 0-150μm that has not been screened and graded after the powder making process such as atomization) is passed through four screening processes in the airflow classification equipment (screened by four classifiers, with screening accuracy of 90-150μm, 56-90μm, 20-56μm and 0-20μm respectively). Among them, the 90-150μm and 56-90μm powder is treated as waste, the medium powder of 20-56μm is used as TC4 powder for 3D printing, and the remaining 0-20μm is the MIN powder required for processing.
[0004] However, the screening rate of metal powder of specified specifications screened by the classifier cannot reach 100%, and the screening accuracy will gradually decrease with the long-term use of the airflow classifier. Therefore, in the 0-20μm screening process, a small amount of powder larger than 40μm will be mixed in (the 20-56μm in the previous screening process was not completely screened). When the MIN powder is used to polish the surface of other parts, it will affect the polishing degree of the part surface and cause a few pits on the part surface. Therefore, it is necessary to modify the existing airflow classifier. Summary of the Invention
[0005] In order to improve the screening accuracy of MIN powder by screening equipment, the present application provides a multi-stage screening device and control method for injection molding titanium alloy powder.
[0006] The present application provides a multi-stage screening device and control method for titanium alloy powder for injection molding, which adopts the following technical solutions: A multi-stage screening device for injection-molded titanium alloy powder comprises a frame, on which a screening device, a feeding assembly, a first classifier, a second classifier, a third classifier and a dust collector are sequentially arranged, the feeding assembly is used to convey powder into the feeding end of the first classifier, the discharging end of the first classifier is connected to the feeding end of the second classifier, and so on, the second classifier, the third classifier and the dust collector are connected, a fan is installed on the frame, the outlet end of the fan is connected to the first classifier by an air inlet pipe, the discharge end of the feeding assembly is connected to the air inlet pipe, the dust collector is connected to the air inlet end of the fan by a return air duct, the inside of the screening device is sequentially installed with a first screening mesh and a second screening mesh from top to bottom, the mesh number of the second screening mesh is 270 mesh, and the mesh number of the first screening mesh is 180 mesh.
[0007] By adopting the above technical solution, during screening, the powder is screened to below 90μm through the first screening net inside the screening device, and then the powder is screened to below 56μm using the second screening net. The powder of 0-56 microns enters the air inlet pipe through the feeding assembly, and the power of the first classifier, the second classifier and the third classifier is adjusted to make the accuracy of the first classifier 41μm, the second classifier 21μm, and the third classifier 20μm. The fan is started to transport the powder to the first classifier, and then it is screened and collected by the first classifier, the second classifier and the third classifier in turn. The remaining 0-19μm powder is recycled and processed by the dust collector, thereby achieving the effect of screening 0-150μm powder. By adding a screening device and modifying the power of the first, second and third classifiers, a small amount of 21-40μm powder from the previous screening process will be mixed in during the screening by the third screening machine. Compared with the existing technology, the possibility of powder larger than 40μm entering the MIN powder is reduced, and the possibility of MIN powder generating a few pits on the surface of the workpiece during the surface polishing process is reduced, thereby improving the screening accuracy of the screening equipment.
[0008] Optionally, an air cooler is installed on the air inlet pipe.
[0009] By adopting the above technical solution, when the first, second, and third classifiers are in operation, their internal classifying wheels rotate at high speeds, causing friction with the internal air, which tends to increase the air temperature and the powder temperature. This can lead to powder particle agglomeration, grain enlargement, and increased oxidation, reducing the screening efficiency of the screening equipment. By installing an air cooler, the powder and the internal classifying wheels of the three classifiers are cooled during air conveyance, further reducing the occurrence of these phenomena and ensuring powder screening efficiency.
[0010] Optionally, the screening device includes a base, a mounting cylinder, a receiving cylinder, an ultrasonic vibrator, an ultrasonic transducer, a vibrator and a cover, the base is connected to the frame, the receiving cylinder is arranged above the base, and a number of buffer springs are connected between the receiving cylinder and the base, the vibrator is connected to the bottom of the receiving cylinder, the surface of the receiving cylinder is provided with a first discharge port, the first discharge port is connected to the feed end of the feeding component, the mounting cylinder is provided with two above the receiving cylinder, the receiving cylinder is provided with a limiting component for limiting the mounting cylinder, the mounting cylinder is provided with a second discharge port, the first screening net is detachable from the upper mounting cylinder, the second screening net is detachable from the lower mounting cylinder, several ultrasonic transducers are installed on the first screening net and the second screening net, the ultrasonic vibrators are installed on the frame, the ultrasonic transducers are electrically connected to the ultrasonic vibrators, the cover is detachably connected to the top of the upper mounting cylinder, and the cover is provided with a feed port.
[0011] By adopting the above technical solution, when the powder is preliminarily screened, the powder falls onto the first screening net through the feed port, the vibrator and the ultrasonic vibrator are started, the receiving tube and the mounting tube are vibrated, and at the same time the ultrasonic vibrator sends a signal to the ultrasonic transducer, causing the ultrasonic transducer to emit ultrasonic waves to the first screening net, causing the first screening net to vibrate twice to screen the powder with a specification of 90-150μm. Similarly, the powder with a specification of 56-90μm is screened through the second screening net. Finally, the powder with a specification of 0-56 microns enters the feed assembly, and is then transported to the air inlet pipe by the feed assembly. In conjunction with the fan, the powder enters the first classifier, thereby achieving the effect of screening the 0-56μm powder and transporting it to the first classifier.
[0012] Optionally, the limiting assembly includes a limiting ring, a fixing seat, a connecting plate and a limiting clamp, the limiting ring is installed on the receiving tube, the fixing seat is connected to several limiting rings, the fixing seat is provided with a limiting groove, several connecting plates are installed on the mounting tube and are located in the limiting groove, the limiting clamp is U-shaped, both ends of the limiting clamp are connected to limiting flanges, the limiting clamp is sleeved on the fixing seat and the connecting plate, the fixing seat and the connecting plate are provided with clamping grooves, the limiting flanges are embedded in the clamping grooves, and similarly limit the space between the two mounting tubes.
[0013] By adopting the above technical solution, when limiting the lower mounting tube, the lower mounting tube is placed in the limiting ring, and the connecting plate is placed in the limiting groove, and then the limiting clamp is placed on the fixing seat and the connecting plate. During this process, the limiting flange contacts the connecting plate and the fixing seat, limiting the deformation of the clamp until the limiting flange is embedded in the clamping groove, thereby limiting the movement of the connecting plate and achieving the installation effect of the mounting tube.
[0014] Optionally, a disassembly component is provided on the limiting splint, and the disassembly component includes a connecting frame, a rotating column and a circular plate. The connecting frame is connected to one at each end of the limiting splint, a connecting column is connected to the connecting frame, the rotating column is rotatably connected to the limiting splint, and the circular plate is connected to the rotating column. A driving arc groove is opened on the circular plate at a position corresponding to the connecting column, and the two driving arc grooves are rotationally symmetrically arranged about the center of the circular plate. The connecting column is arranged in the driving arc groove, and a gap is left between the connecting column and the two side walls of the driving arc groove.
[0015] By adopting the above technical solution, during maintenance, the rotating column is rotated to rotate the circular plate, which drives the two driving arc grooves to rotate, so that the connecting column moves, the connecting frame deforms, and drives the two ends of the limiting clamp to deform until the limiting flange is disengaged from the clamping groove. The limiting clamp can be taken out to remove the lower mounting tube, and the upper mounting tube can be removed similarly.
[0016] 4. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt, and a nut.
[0017] By adopting the above technical solution, when installing the first screening net, the support spring is sleeved on the installation column, and then the first screening net is sleeved on the installation column. Finally, the insert block is moved to press the fixed column against the inclined surface to make the first screening net descend, and the support spring is deformed until it presses against the arc groove to fit the surface of the installation column. At this time, the fixed column enters the limit displacement groove, thereby limiting the movement of the first screening net, thereby realizing the installation of the first screening net. The second screening net is installed in the same way.
[0018] Optionally, the stabilizing member is a stabilizing bolt, an L-plate is connected to the top wall of the insert block, the stabilizing member passes through the L-plate and the top end of the mounting post, and is threadedly engaged with the mounting post.
[0019] By adopting the above technical solution, after the insert is installed, the stabilizing member is rotated, the stabilizing member descends, and presses against the L-plate, further reducing the possibility of the insert being separated from the installation column after being vibrated.
[0020] Optionally, a counterweight block is installed at the bottom end of the receiving cylinder, and the counterweight block is located above the vibrating machine.
[0021] By adopting the above technical solution, the counterweight block is used to increase the weight of the receiving cylinder to lower the center of gravity of the entire screening device, thereby further improving the stability of the screening device.
[0022] A control method for a multi-stage screening device for injection-molded titanium alloy powder includes the following steps: S1. Preliminary screening: put the 0-150μm powder into the screening device through the feed port, start the vibrator to vibrate the first screening net and the second screening net, and use the ultrasonic vibrator to send a vibration signal to the ultrasonic transducer to make the ultrasonic transducer send ultrasonic waves to the first screening net, so that the first screening net vibrates twice, so that the 90-150μm powder is screened and discharged from the second discharge port above. Similarly, the second screening net is vibrated twice, so that the 56-90μm powder is screened and discharged from the second discharge port below. The remaining powder below 56μm is discharged from the first discharge port. The powder is transported to the feed assembly through the air inlet; S2, final screening: the power of the first classifier, the second classifier and the third classifier is adjusted to make the screening accuracy of the first classifier to 41μm, the screening accuracy of the second classifier to 21μm, and the screening accuracy of the third classifier to 20μm. The feed assembly conveys the powder of 0-56μm into the air inlet pipe, starts the fan, and the wind conveys the powder to the first classifier, which is screened by the first classifier, the second classifier and the third classifier in turn; S3, residual powder processing: the powder of 0-19 microns screened by the third classifier enters the dust collector for recycling.
[0023] By adopting the above technical solution and adding a screening device, the powder entering the first classifier is reduced to below 56 μm, and the power of the first, second and third classifiers is readjusted. The first classifier screens powders above 41 μm, the second classifier screens powders above 21 μm, and the third classifier screens 20 μm. The remaining 0-19 μm powder enters the dust collector for recycling and treatment, of which powders with specifications of 41-56 μm and 21-40 μm are used as TC4 powder for 3D printing, and 20 μm powder is used as MIN powder.
[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. During screening, the powder is screened to below 90μm through the first screening net inside the screening device, and then the powder is screened to below 56μm using the second screening net. The powder of 0-56 microns enters the air inlet pipe through the feeding assembly. The power of the first classifier, the second classifier and the third classifier is adjusted to make the accuracy of the first classifier 41μm, the second classifier 21μm, and the third classifier 20μm. The fan is started to transport the powder to the first classifier, and then it is screened and collected by the first classifier, the second classifier and the third classifier in turn. The remaining 0-19μm powder is recycled and processed by the dust collector, achieving the effect of screening 0-150μm powder. By adding a screening device and modifying the power of the first, second, and third classifiers, a small amount of 21-40μm powder from the previous screening process will be mixed in during the screening process of the third screening machine. Compared with the existing technology, this reduces the possibility of powder larger than 40μm entering the MIN powder, and reduces the possibility of MIN powder causing small pits on the surface of the workpiece during the surface polishing process, thereby improving the screening accuracy of the screening equipment; 2. When limiting the lower installation tube, place the lower installation tube in the limiting ring and place the connecting plate in the limiting groove. Then, put the limiting clamping plate on the fixing seat and the connecting plate. During this process, the limiting flange contacts the connecting plate and the fixing seat, limiting the deformation of the clamping plate until the limiting flange is embedded in the clamping groove, thereby limiting the movement of the connecting plate and achieving the installation effect of the installation tube; 3. During maintenance, rotate the rotating column to rotate the circular plate, which drives the two driving arc grooves to rotate, causing the connecting column to move, the connecting frame to deform, and the two ends of the limiting clamping plate to deform until the limiting flange is out of the clamping groove. The limiting clamping plate can be removed to remove the lower mounting cylinder. Similarly, remove the upper mounting cylinder. 4. When installing the first screening net, put the support spring on the installation column, then put the first screening net on the installation column, and finally move the plug to press the fixed column against the inclined surface to make the first screening net drop down, and the support spring deforms until it presses the arc groove against the surface of the installation column. At this time, the fixed column enters the limit displacement groove, which in turn limits the movement of the first screening net, thus realizing the installation of the first screening net. The second screening net is installed in the same way. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the overall structure of the screening equipment in the embodiment of the present application.
[0026] Figure 2 It is a structural schematic diagram of the screening device in an embodiment of the present application.
[0027] Figure 3 It is a cross-sectional view used to illustrate the structure of the screening device in the embodiment of the present application.
[0028] Figure 4It is an exploded view used to illustrate the structure of the restricting component and the disassembling component in the embodiment of the present application.
[0029] Figure 5 yes Figure 3 Enlarged view of point A in the middle.
[0030] Figure 6 It is an exploded view used to illustrate the installation component structure in the embodiment of the present application.
[0031] Explanation of reference numerals: 1. frame; 11. feed assembly; 111. feed pipe; 112. feed barrel; 113. screw conveyor; 12. first classifier; 13. second classifier; 14. third classifier; 15. dust collector; 16. fan; 161. air inlet pipe; 162. air return pipe; 163. air cooler; 2. screening device; 21. base; 211. buffer spring; 22. mounting cylinder; 221. second discharge port; 222. first screening net; 223. second screening net; 23. receiving cylinder; 231. counterweight; 232. first discharge port; 24. ultrasonic Wave vibrator; 25. Ultrasonic transducer; 26. Vibrator; 27. Cover; 3. Limiting assembly; 31. Limiting ring; 32. Fixed seat; 321. Limiting groove; 33. Connecting plate; 34. Limiting splint; 341. Limiting flange; 4. Disassembly assembly; 41. Connecting frame; 42. Rotating column; 43. Circular plate; 431. Driving arc groove; 5. Mounting assembly; 51. Fixed ring; 52. Mounting column; 53. Support spring; 54. Insert block; 541. Interference slope; 542. Interference arc groove; 543. Limiting groove; 544. L-plate; 545. Stabilizer; 55. Fixed column. DETAILED DESCRIPTION
[0032] The following is combined with Figures 1-6 This application is described in further detail.
[0033] The present application discloses a multi-stage screening device and control method for titanium alloy powder for injection molding. Figure 1 The multi-stage screening device for injection molding titanium alloy powder includes a frame 1, on which a screening device 2, a feeding assembly 11, a first classifier 12, a second classifier 13, a third classifier 14 and a dust collector 15 are sequentially arranged along the length direction.
[0034] Reference Figure 2 and Figure 3The screening device 2 includes a base 21, a mounting tube 22, a receiving tube 23, an ultrasonic vibrator 24, an ultrasonic transducer 25, a vibrator 26 and a cover 27. The base 21 is connected to the frame 1 by bolts. The receiving tube 23 is arranged above the base 21, and a plurality of buffer springs 211 are fixedly connected to the base 21. A counterweight 231 is installed at the bottom of the receiving tube 23, and the counterweight 231 is used to lower the center of gravity of the screening device. The vibrator 26 is installed at the bottom of the receiving tube 23 and is located inside the base 21. The counterweight 231 is located above the vibrator 26. A first discharge port 232 is fixedly connected to the surface of the receiving tube 23.
[0035] Reference Figure 3 、 Figure 4 and Figure 5 Two mounting cylinders 22 are vertically arranged above the receiving cylinder 23. Both mounting cylinders 22 are provided with a second discharge port 221. A limiting assembly 3 is provided between the receiving cylinder 23 and the mounting cylinder 22 and between the two mounting cylinders 22. The limiting assembly 3 includes a limiting ring 31, a fixing seat 32, a connecting plate 33 and a limiting clamping plate 34. One limiting ring 31 is fixedly connected to each of the receiving cylinder 23 and the lower mounting cylinder 22. Several fixing seats 32 are fixedly connected to the surfaces of the receiving cylinder 23 and the lower mounting cylinder 22. In this embodiment, three are used as an example. A limiting groove 321 is provided on the fixing seat 32. Three connecting plates 33 are fixedly connected to each of the upper mounting cylinder 22 and the lower mounting cylinder 22. The connecting plates 33 are placed in the limiting groove 321.
[0036] Reference Figure 4 and Figure 5 The limiting clamping plate 34 is U-shaped, and the limiting flanges 341 are fixedly connected to the opposite side walls of the limiting clamping plate 34. The connecting plate 33 and the fixing seat 32 are both provided with clamping grooves, and the limiting clamping plate 34 is sleeved on the connecting plate 33 and the fixing seat 32, and the limiting flanges 341 are embedded in the clamping grooves.
[0037] Reference Figure 4 and Figure 5 The limiting clamp 34 is provided with a disassembly assembly 4, which includes a connecting frame 41, a rotating post 42, and a circular plate 43. The connecting frame 41 is fixedly connected to each end of the limiting clamp 34. The ends of the connecting frame 41 are fixedly connected to connecting posts, and the ends of the connecting posts are fixedly connected to baffles. The rotating post 42 is rotatably connected to the limiting clamp 34. The circular plate 43 is fixedly connected to the rotating post 42. The circular plate 43 has two driving arc grooves 431 formed therein, and the two driving arc grooves 431 are rotationally symmetrically arranged about the center of the circular plate 43. The connecting posts are disposed within the driving arc grooves 431, with a gap between them and the side walls of the driving arc grooves 431.
[0038] When limiting the installation tube 22, the lower installation tube 22 is placed in the limiting ring 31, and the connecting plate 33 is placed in the limiting groove 321, and then the limiting clamping plate 34 is mounted on the connecting plate 33 and the fixing seat 32. In this process, the limiting flange 341 emerges from the connecting plate 33 or the fixing seat 32, causing the limiting clamping plate 34 to deform until the limiting flange 341 enters the clamping groove, and the limiting clamping plate 34 fits the connecting plate 33 and the fixing groove to limit the lower installation tube 22. Similarly, the upper installation tube 22 is installed; during maintenance, the rotating column 42 is rotated to rotate the circular plate 43, and the connecting column is driven to move by driving the arc groove 431, so that the connecting frame 41 is deformed, and the end of the limiting clamping plate 34 is driven to deform, so that the limiting flange 341 is disengaged from the clamping groove, so as to remove the limiting clamping plate 34 and take out the installation tube 22.
[0039] Reference Figure 2 and Figure 3 A first screening net 222 and a mounting assembly 5 are provided in the upper mounting cylinder 22. The mesh number of the first screening net 222 is 180 meshes. Several ultrasonic transducers 25 are installed on the first screening net 222. In this embodiment, two are taken as an example. The ultrasonic vibrator 24 is installed on the frame 1, and the ultrasonic transducer 25 is electrically connected to the ultrasonic vibrator 24.
[0040] Reference Figure 3 、 Figure 5 and Figure 6 The mounting assembly 5 includes a fixing ring 51, a mounting column 52, a support spring 53, an insert 54 and a fixing column 55. The fixing ring 51 is fixedly connected to the upper mounting cylinder 22, and a number of mounting columns 52 are vertically fixedly connected to the fixing ring 51. In this embodiment, four are used as an example. Two fixing columns 55 are horizontally fixedly connected to the ends of the mounting columns 52, and the two fixing columns 55 are arranged rotationally symmetrically with respect to the mounting columns 52. The first screening net 222 is sleeved on the mounting column 52, and the support spring 53 is sleeved on the mounting column 52 and is located between the first screening net 222 and the fixing ring 51. The end of the insert 54 is provided with a conflicting inclined surface 541, and the length of the insert 54 gradually increases from top to bottom as the reference direction. A conflicting arc groove 542 is provided in the middle position of the length direction of the insert 54, and the conflicting arc groove 542 fits the surface of the mounting column 52. A limited displacement groove 543 is provided at the top of the insert 54, and the fixing column 55 passes through the limited displacement groove 543. Four groups of mounting components 5 are also provided in the lower mounting cylinder 22 . The lower mounting cylinder 22 is installed with a second screening net 223 through the mounting component 5 . The mesh number of the second screening net 223 is 270 meshes. Two ultrasonic transducers 25 are also installed on the second screening net 223 .
[0041] Reference Figure 6In order to reduce the possibility of the plug block 54 being separated from the mounting column 52, an L-plate 544 is fixedly connected to the top of the plug block 54. A stabilizing member 545 is provided on the L-plate 544. The stabilizing member 545 is a stabilizing bolt. The stabilizing member 545 passes through the L-plate 544 and cooperates with the thread at the top of the mounting column 52.
[0042] When installing the first screening net 222, the support spring 53 is sleeved on the installation column 52, and the first screening net 222 is sleeved on the installation column 52. Then, the interference inclined surface 541 of the insert block 54 applies pressure to the fixed column 55. The first screening net 222 descends, and the support spring 53 is compressed until the interference arc groove 542 fits the installation column 52, and the fixed column 55 enters the limit displacement groove 543. Finally, the stabilizing member 545 is rotated until the stabilizing member 545 is pressed against the L-plate 544, thereby completing the installation of the first screening net 222.
[0043] Reference Figure 2 and Figure 3 The cover 27 is arranged at the top of the upper mounting cylinder 22 and is connected to the upper mounting cylinder 22 by a buckle. The cover 27 is provided with a feed port.
[0044] Reference Figure 1 The feeding assembly 11 includes a feeding pipe 111 and a feeding barrel 112. The feeding pipe 111 is fixedly connected to the feeding barrel 112 and passes through the frame 1. The feeding pipe 111 is connected to the first discharge port 232. A screw conveyor 113 is installed below the feeding barrel 112. A fan 16 is installed on the frame 1. An air inlet pipe 161 is connected between the air outlet of the fan 16 and the first classifier 12. The discharge port of the screw conveyor 113 is connected to the air inlet pipe 161. An air cooler 163 is installed on the air inlet pipe 161. The air cooler 163 is used to reduce the temperature of the powder and the grading wheel inside the classifier. The discharge port of the first classifier 12 is connected to the feeding port of the second classifier 13, and so on. A return air duct 162 is connected between the dust collector 15 and the air inlet of the classification.
[0045] Reference Figure 1 Dust collector 15 is equipped with a built-in filter bag and a pulse generator. The outlet of return air duct 162 is located inside the filter bag. During collection, powders smaller than 20 μm adhere to the surface of the filter bag. The pulse generator impacts the filter bag, causing the powder to fall off, effectively collecting powders smaller than 20 μm.
[0046] The implementation principle of the multi-stage screening device for injection molding titanium alloy powder in the embodiment of the present application is: during screening, the powder is poured into the screening device 2 and falls on the first screening net 222, the vibrator 26 and the ultrasonic vibrator 24 are started, the mounting cylinder 22 and the receiving cylinder 23 are vibrated, the first screening net 222 is vibrated by the ultrasonic transducer 25, and the powder above 90 μm is screened. Similarly, the second screening net 223 screens the powder above 56 μm, and the remaining powder enters the feed barrel 112, and the powder is transported to the air inlet pipe 161 through the screw conveyor 113, the fan 16 is started, and the powder is transported to the first classifier 12 by wind, and the powder is screened to below 41 μm, the second classifier 13 is used to screen the powder to above 21 μm, and the third classifier 14 is used to screen the powder to 20 μm, and finally the dust collector 15 is used to recycle the powder below 20 μm, thereby achieving the effect of screening 20 μm powder.
[0047] By adding the screening device 2 and modifying the power of the first classifier 12, the second classifier 13 and the third classifier 14, a small amount of 21-40 μm powder from the previous screening process will be mixed in during the screening by the third screening machine. Compared with the existing technology, the possibility of powder larger than 40 μm entering the MIN powder is reduced, and the possibility of the MIN powder generating a few pits on the surface of the workpiece during the surface polishing process of the workpiece is reduced, thereby improving the screening accuracy of the screening equipment.
[0048] A control method for a multi-stage screening device for injection-molded titanium alloy powder comprises the following steps: S1. Preliminary screening: put the 0-150μm powder into the screening device 2, start the vibrator 26 and the ultrasonic vibrator 24, the receiving tube 23 and the mounting tube 22 vibrate, the ultrasonic vibrator 24 sends a vibration signal to the ultrasonic transducer 25, and the ultrasonic transducer 25 sends ultrasonic waves to the first screening net 222. The first screening net 222 and the second screening net 223 are both subjected to double vibration. The first screening net 222 screens powders larger than 90μm, and the second screening net 223 screens powders larger than 56μm. Finally, the 0-56μm powder is transported to the feed barrel 112, and the powder is transported into the first classifier 12 through the screw conveyor 113 and the fan 16. The 56-150μm powder is treated as waste.
[0049] S2. Final screening: The power of the first classifier 12, the second classifier 13, and the third classifier 14 are adjusted to make the screening accuracy of the first classifier 12 41 μm, the screening accuracy of the second classifier 13 21 μm, and the screening accuracy of the third classifier 14 20 μm. The powder is transported by the fan 16 and screened by the first classifier 12, the second classifier 13, and the third classifier 14 in sequence. Finally, only the powder below 20 μm is sent to the dust collector 15 for collection. The powders of 41-56 μm and 21-40 μm are used as TC4 powder for 3D printing, and the powder of 20 μm is used as MIN powder.
[0050] S3. Treatment of residual powder: Powders below 20 μm fall onto the surface of the filter bag inside the dust collector 15. The pulse generator releases pulses to the filter bag, causing the filter bag to vibrate and drop the powder, thereby collecting the powder below 20 μm.
[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A multi-stage screening device for titanium alloy powder for injection molding, characterized by: The invention comprises a frame (1), wherein a screening device (2), a feeding assembly (11), a first classifier (12), a second classifier (13), a third classifier (14) and a dust collector (15) are sequentially arranged on the frame (1), wherein the feeding assembly (11) is used to convey powder into the feeding end of the first classifier (12), the discharging end of the first classifier (12) is connected to the feeding end of the second classifier (13), and so on and so forth, the second classifier (13), the third classifier (14) and the dust collector (15) are connected, and the frame (1) is provided with a screening device (2), a feeding assembly (11), a first classifier (12), a second classifier (13), a third classifier (14) and a dust collector (15). A fan (16) is provided, an air inlet pipe (161) is connected between the air outlet end of the fan (16) and the first classifier (12), the discharge end of the feed assembly (11) is connected to the air inlet pipe (161), the dust collector (15) is connected to the air inlet end of the fan (16) via a return air pipe (162), and a first screening net (222) and a second screening net (223) are sequentially installed inside the screening device (2) from top to bottom, the mesh number of the second screening net (223) is 270 meshes, and the mesh number of the first screening net (222) is 180 meshes.
2. The multi-stage screening device for titanium alloy powder for injection molding according to claim 1, characterized in that: An air cooler (163) is installed on the air inlet pipe (161).
3. The multi-stage screening device for titanium alloy powder for injection molding according to claim 1, characterized in that: The screening device (2) comprises a base (21), a mounting cylinder (22), a receiving cylinder (23), an ultrasonic vibrator (24), an ultrasonic transducer (25), a vibrator (26) and a cover (27), wherein the base (21) is connected to the frame (1), the receiving cylinder (23) is arranged above the base (21), and a plurality of buffer springs (211) are connected between the receiving cylinder and the base (21), the vibrator (26) is connected to the bottom of the receiving cylinder (23), a first discharge port (232) is arranged on the surface of the receiving cylinder (23), and the first discharge port (232) is connected to the feed end of the feed assembly (11), the mounting cylinder (22) is provided with two above the receiving cylinder (23), the receiving cylinder (23) is provided with a plurality of buffer springs (211), the vibrator (26) is connected to the bottom of the receiving cylinder (23), ... feeding assembly (11), the mounting cylinder (22) is provided with two above the receiving cylinder (23), the receiving cylinder (23) is provided with a plurality of buffer springs (211), the vibrator (26) is connected to the bottom of the receiving cylinder (23), the receiving cylinder (23) is provided with a plurality of buffer spring 3) is provided with a limiting component (3) for limiting the mounting cylinder (22), the mounting cylinder (22) is provided with a second discharge port (221), the first screening net (222) is detachable on the upper mounting cylinder (22), the second screening net (223) is detachable on the lower mounting cylinder (22), a plurality of ultrasonic transducers (25) are installed on the first screening net (222) and the second screening net (223), the ultrasonic vibrator (24) is installed on the frame (1), the ultrasonic transducer (25) is electrically connected to the ultrasonic vibrator (24), the cover (27) is detachably connected to the top of the upper mounting cylinder (22), and the cover (27) is provided with a feed port.
4. The multi-stage screening device for titanium alloy powder for injection molding according to claim 3, characterized in that: The limiting assembly (3) comprises a limiting ring (31), a fixing seat (32), a connecting plate (33) and a limiting clamping plate (34); the limiting ring (31) is mounted on the receiving tube (23); the fixing seat (32) is connected to a plurality of limiting rings (31); a limiting groove (321) is provided on the fixing seat (32); a plurality of connecting plates (33) are mounted on the mounting tube (22) and are located in the limiting groove (321); the limiting clamping plate (34) is U-shaped; both ends of the limiting clamping plate (34) are connected to limiting flanges (341); the limiting clamping plate (34) is sleeved on the fixing seat (32) and the connecting plate (33); a clamping groove is provided on the fixing seat (32) and the connecting plate (33); the limiting flange (341) is embedded in the clamping groove, and similarly limits the space between the two mounting tubes (22).
5. The multi-stage screening device for titanium alloy powder for injection molding according to claim 4, characterized in that: The limiting clamp (34) is provided with a disassembly assembly (4), and the disassembly assembly (4) includes a connecting frame (41), a rotating column (42) and a circular plate (43). The connecting frame (41) is connected to each end of the limiting clamp (34). The connecting frame (41) is connected to a connecting column. The rotating column (42) is rotatably connected to the limiting clamp (34). The circular plate (43) is connected to the rotating column (42). A driving arc groove (431) is opened on the circular plate (43) at a position corresponding to the connecting column. The two driving arc grooves (431) are rotationally symmetrically arranged with respect to the center of the circular plate (43). The connecting column is arranged in the driving arc groove (431) and a gap is left between the connecting column and the two side walls of the driving arc groove (431).
6. The multi-stage screening device for titanium alloy powder for injection molding according to claim 3, characterized in that: The mounting tube (22) is provided with a mounting assembly (5), the mounting assembly (5) comprising a fixing ring (51), a mounting post (52), a support spring (53), an insert (54) and a fixing post (55), the fixing ring (51) being connected to the inner ring wall of the mounting tube (22), a plurality of the mounting posts (52) being vertically connected to the fixing ring (51), two fixing posts (55) being horizontally connected to the top of the mounting posts (52), the two fixing posts (55) being arranged opposite to each other, the mounting post (52) passing through the first screening net (222), the support spring (53) being sleeved on the mounting post (52) and being located at the first screening net ( 222) and the fixing ring (51), the insert block (54) is provided with a contact inclined surface (541), a contact arc groove (542) and a limit displacement groove (543), the contact arc groove (542) is located in the middle position of the width direction of the insert block (54), the limit displacement groove (543) is located at the top of the insert block (54), and the length of the insert block (54) gradually increases from top to bottom as a reference direction. When limited, the contact arc groove (542) fits the surface of the mounting column (52), the fixing column (55) is located in the limit displacement groove (543), and the insert block (54) is provided with a stabilizing member (545) for placing the insert block (54) away from the mounting column (52).
7. The multi-stage screening device for titanium alloy powder for injection molding according to claim 6, characterized in that: The stabilizing member (545) is a stabilizing bolt. An L-plate (544) is connected to the top wall of the insert block (54). The stabilizing member (545) passes through the L-plate (544) and the top of the mounting column (52), and is threadedly engaged with the mounting column (52).
8. The multi-stage screening device for titanium alloy powder for injection molding according to claim 3, characterized in that: A counterweight block (231) is installed at the bottom end of the receiving cylinder (23), and the counterweight block (231) is located above the vibrating machine (26).
9. A method for controlling a screening device according to any one of claims 1 to 8, characterized in that: The steps include: S1. Preliminary screening: 0-150 μm powder is placed into the screening device (2) through the feed port, the vibrator (26) is started to vibrate the first screening net (222) and the second screening net (223), and the ultrasonic vibrator (24) is used to send a vibration signal to the ultrasonic transducer (25), so that the ultrasonic transducer (25) emits ultrasonic waves to the first screening net (222), causing the first screening net (222) to vibrate twice, so that the powder of 90-150 μm is screened and discharged from the second discharge port (221) above. Similarly, the second screening net (223) is vibrated twice, so that the powder of 56-90 μm is screened and discharged from the second discharge port (221) below. The remaining powder below 56 μm enters the feeding assembly (11) from the first discharge port (232); S2, final screening: adjusting the power of the first classifier (12), the second classifier (13) and the third classifier (14) so that the screening accuracy of the first classifier (12) is 41 μm, the screening accuracy of the second classifier (13) is 21 μm, and the screening accuracy of the third classifier (14) is 20 μm. The feeding assembly (11) conveys the powder of 0-56 μm into the air inlet pipe (161), and the fan (16) is started. The wind conveys the powder to the first classifier (12), and the powder is screened by the first classifier (12), the second classifier (13) and the third classifier (14) in sequence. S3. Residual powder processing: The 0-19 micron powder sieved by the third classifier (14) enters the dust collector (15) for recycling.