A selective laser melting recycling powder screening, packaging and detecting integrated device and a working method thereof

Abstract

This invention discloses an integrated device for selective laser melting (SLM) recovery powder sieving, packaging, and testing, and its operating method. The device includes a cabinet, a powder sieving mechanism, a sampling and diversion structure, a bag feeding mechanism, a bag-supporting, sealing, and vacuuming mechanism, a bag-supporting and weighing mechanism, and a control unit. The powder sieving mechanism is located at the top of the cabinet, and the sampling and diversion structure is downstream of the powder sieving mechanism. The bag feeding mechanism, bag-supporting, sealing, and vacuuming mechanism, and bag-supporting and weighing mechanism are sequentially arranged from top to bottom along the main powder discharge path to complete the bagging, sealing, vacuuming, and weighing of the recovered powder. The sampling and diversion structure is connected to the main powder discharge path to intermittently obtain a portion of the recovered powder from the main powder discharge path. The cabinet is equipped with a particle size analyzer and a LIBS analyzer. The control unit is electrically connected to each mechanism. This integrated device is rationally designed and facilitates the sieving, bag feeding, bag-supporting and powder collection, vacuum sealing, weighing output, and packaging removal of the recovered powder with reduced manual intervention.

Description

Technical Field

[0001] This invention relates to an integrated detection device, and more particularly to an integrated device and method for selective laser melting and recycling of powder for sieving, packaging and detection. Background Technology

[0002] In the selective laser melting (SLM) process, after the part is printed, a large amount of unmelted metal powder and a small amount of larger particles or impurity particles formed by splashing, agglomeration, or local sintering usually remain in the forming cavity. Currently, the treatment of this part of the recovered powder generally includes steps such as powder collection, sieving, temporary storage, or packaging.

[0003] A common method is for operators to collect the recycled powder from the equipment into a tank, barrel, or powder collection box after printing, and then transfer it to an independent powder sieving device or a manual sieve for sieving to remove large particles, agglomerated particles, and impurities. After sieving, the qualified powder is then manually poured into bags, bottles, or powder storage containers for storage. In this type of solution, the processes of sieving, bagging, sealing, weighing, and recording are usually separated and need to be completed step by step by the operators.

[0004] In addition, some existing technologies employ vibrating screens, ultrasonic screens, or sieving devices with inert atmosphere protection to perform closed sieving of recycled metal powders, thereby improving sieving efficiency and reducing the risk of powder oxidation. Other solutions combine some stages of recycling, sieving, storage, or packaging; for example, the sieved powder is introduced into storage bins, bags, or collection bottles, and then quantitative collection is achieved using a bag-supporting weighing mechanism, or the container opening is sealed using a heat-sealing mechanism. Still other solutions monitor the powder storage or sieving environment using oxygen sensors, humidity sensors, or other single detection components to improve the preservation conditions of the recycled powder.

[0005] Furthermore, in terms of metal powder quality testing, existing technologies typically employ independent testing instruments for offline powder analysis, such as single-item testing of powder particle size distribution, oxygen content, humidity, flowability, or composition. This type of testing generally requires manual sampling after sieving, followed by analysis using specialized testing equipment. The results are primarily used to manually determine whether the recycled powder can be reused. Regarding the control of printing process parameters, existing technologies rely more on analysis of powder spreading status, molten pool status, image signals, or forming process monitoring results, rarely establishing a direct link between the quality status of the recycled powder after sieving and subsequent printing parameter adjustments.

[0006] Therefore, existing powder recycling solutions have the following drawbacks:

[0007] 1. Existing solutions mostly adopt a step-by-step operation method of "powder collection - transfer - sieving - bagging - packaging - weighing - recording". The connection between each process is poor and the degree of manual involvement is high. Not only is the process cumbersome and inefficient, but the metal powder is also prone to scattering, contamination, moisture or oxidation during multiple transfers and open operations, which brings safety risks.

[0008] 2. Although the existing solution can screen or package the recycled powder, the screening station and the packaging station are usually independent of each other. There is a lack of a continuous processing structure that allows the powder to directly enter the packaging process after screening. Therefore, it is difficult to complete continuous actions such as bag feeding, bag opening, powder collection, vacuuming, bag sealing and weighing in the same equipment. The overall level of automation is still insufficient.

[0009] 3. Existing solutions often rely on manual experience or offline sampling and testing to judge the quality of recycled powder. Usually, samples can only be taken separately after sieving and sent to external equipment for testing. It is impossible to complete online sampling and testing and real-time judgment before the powder enters the packaging station. Therefore, it is difficult to identify in time whether there are still coarse particles, agglomerated particles, abnormal particle size distribution or composition shift in the powder after sieving.

[0010] 4. Existing detection methods are mostly based on single-index detection. Environmental monitoring and powder quality testing, powder quality testing and packaging release, and powder quality testing and printing parameter optimization are usually isolated from each other. There is a lack of a comprehensive evaluation mechanism based on the state of the recycled powder. It is impossible to use the particle size characteristics and elemental composition information of the recycled powder after sieving to reverse characterize the states such as splashing, evaporation, and melt pool stability during the printing process. Furthermore, it is impossible to further feed the results back to the printing equipment control system for process optimization of subsequent printing tasks. Summary of the Invention

[0012] In view of the shortcomings of the prior art, the purpose of this invention is to provide an integrated device for selective laser melting and recycling of powder, sieving, packaging and testing, and its working method. This integrated device for selective laser melting and recycling of powder, sieving, packaging and testing is reasonably designed and can realize the sieving, bag feeding, bag opening and powder collection, vacuum sealing, weighing output and packaging removal of recycled powder with reduced manual intervention.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] A selective laser melting recovery powder sieving, packaging, and testing integrated device is characterized by comprising a cabinet, a powder sieving mechanism, a sampling and diversion structure, a bag feeding mechanism, a bag supporting, sealing, and vacuuming mechanism, a bag supporting and weighing mechanism, and a control unit. The powder sieving mechanism is located at the top of the cabinet, and the sampling and diversion structure is located downstream of the powder sieving mechanism. The bag feeding mechanism, bag supporting, sealing, and vacuuming mechanism, and bag supporting and weighing mechanism are arranged sequentially from top to bottom along the main powder drop path to complete the bagging, sealing, vacuuming, and weighing of the recovered powder. The sampling and diversion structure is connected to the main powder drop path to intermittently obtain a portion of the recovered powder from the main powder drop path. The cabinet is equipped with a particle size analyzer and a LIBS analyzer to detect a portion of the recovered powder obtained by the sampling and diversion structure. The control unit is electrically connected to each mechanism.

[0015] Preferably, the powder screening mechanism includes a screening base, at least two layers of first and second screens stacked on the screening base, a screening top cover, guide rods, fasteners, and an ultrasonic vibrator; the first screen has a larger mesh size than the second screen, the screening top cover is located on top, and is pressed and fixed to the first screen, the second screen, and the screening base by the guide rods and fasteners, so that the powder screening mechanism forms a relatively closed screening space, and the ultrasonic vibrator is installed on the outside of the screening base to apply vibration to the screens.

[0016] Preferably, the above-mentioned sampling and diversion structure includes a funnel-shaped guide, a side wall sampling hole provided on the funnel-shaped guide, a controllable butterfly valve, a first diversion pipe, a second diversion pipe, and a first sample carrier plate and a second sample carrier plate; when the butterfly valve is opened, part of the recovered powder flows through the first diversion pipe and the second diversion pipe to the first sample carrier plate and the second sample carrier plate, respectively. The particle size analyzer and the LIBS analyzer are respectively positioned facing the first sample carrier plate and the second sample carrier plate to detect the recovered powder that falls into them.

[0017] Preferably, the bag feeding mechanism includes three sets of bag feeding and transport modules and three sets of spacing adjustment modules; the spacing adjustment modules are slidably installed on the spacing adjustment guide rails fixed to the cabinet to adjust the spacing of the spacing adjustment modules to adapt to different sizes of packaging bags; each spacing adjustment module is provided with a guide rail mounting plate and a bag feeding guide rail mounted on the guide rail mounting plate, and the bag feeding and transport modules are slidably installed on the bag feeding guide rails. The three sets of bag feeding and transport modules cooperate in pairs to send the empty bags to the bag opening, sealing and vacuuming mechanism.

[0018] Preferably, the above-mentioned bag-seal vacuuming mechanism includes a left clamp and a right clamp that can open and close relative to each other. The lower part of the left clamp and the right clamp is provided with a vacuum channel and a sealing ring attached to the wall of the vacuum channel. The area enclosed by the sealing ring is provided with a negative pressure hole communicating with the vacuum channel for adsorbing the bag opening. At the same time, a heat sealing strip is provided on the lower side of the sealing ring to heat seal the bag opening.

[0019] Preferably, the bag weighing mechanism includes a tray for receiving the packaging bags, a strain gauge weight sensor located below the tray, a lifting guide rail, and a lifting drive component; the tray supports the packaging bags and weighs them in real time, and when the weight reaches a preset threshold, the lifting drive component drives the lifting guide rail and the tray to move downward.

[0020] Preferably, both sides of the left and right clamping plates are rotatably connected to the cabinet via swing rods. The upper end of the swing rod is equipped with a synchronous transmission gear to enable the swing rod to rotate synchronously. The right clamping plate is hinged to the free end of the telescopic rod of a cylinder so that the cylinder drives the right clamping plate to rotate, which in turn synchronously drives the left clamping plate to rotate.

[0021] Preferably, the end of the second diversion tube has a slanted cut structure to reduce the impact and dust of the sample powder, so that the sample powder falls smoothly into the corresponding first sample carrier plate and second sample carrier plate.

[0022] Preferably, a flexible powder guide is provided between the main powder dispensing channel and the bag-supporting, sealing, and vacuuming mechanism to limit powder scattering and improve the directionality and stability of powder dispensing.

[0023] The working method of the selective laser melting and recycling powder sieving, packaging and testing integrated device of the present invention is characterized by the following steps: the recycled powder enters the powder sieving mechanism to complete multi-stage ultrasonic sieving;

[0024] The bag feeding mechanism delivers the packaging bag to the packaging station, and the bag opening, sealing, and vacuuming mechanism completes the adsorption and opening process to open the bag. The sieved powder is loaded into the packaging bag through the main powder discharge channel, while the lateral sampling and diversion structure diverts the sample powder. The particle size analyzer and LIBS analyzer perform online detection, and the sieved powder is judged to be qualified based on the test results. After the bag weighing mechanism detects that the weight of the packaging bag has reached the preset weight, the bag opening, sealing, and vacuuming mechanism performs bag opening closure, vacuuming, and heat sealing. After the packaging is completed, the tray moves down, the control unit outputs the weight value, and the operator takes out the packaging bag containing the recycled powder.

[0025] This application relates to an integrated device for processing recycled powder from selective laser melting (SLM). It achieves the screening, bag feeding, bag opening and powder collection, vacuum sealing, weighing, and packaging of recycled powder while minimizing manual handling and open-top operations. Simultaneously, it enables online sampling and diversion of the recycled powder after screening, and rapid detection and comprehensive judgment of its particle size characteristics and elemental composition. This allows for verification of the reusability of the recycled powder before packaging and release, and further provides a basis for the analysis and correction of subsequent printing process parameters, thereby improving the efficiency of recycled powder processing, the reliability of recycled powder reuse, and the stability of the selective laser melting (SLM) process. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the powder screening mechanism in an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the sampling and diversion structure in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the bag feeding mechanism according to an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the bag-sealable vacuuming mechanism according to an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the bag weighing mechanism according to an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the overall structure of this application after the outer shell has been removed;

[0033] Figure 8 This is a partial bottom view of this application (a schematic diagram of the installation structure of the rolling wheel).

[0034] Figure 9 This is a partial view of the connection between the left clamping plate and the sealing ring, etc.

[0035] 1: Cabinet; 2: Powder sieving mechanism; 3: Sampling and diversion structure; 4: Flexible powder guide; 5: Bag feeding mechanism; 6: Bag supporting, sealing, and vacuuming mechanism; 7: Bag supporting and weighing mechanism; 8: Electrical cabinet and display; 9: Power supply module.

[0036] 2: Screening mechanism: 21: Screening top cover; 22: First screen; 23: First screening barrel; 24: Second screen; 25: Second screening barrel; 26: Fastener; 27: Guide rod; 28: Ultrasonic vibrator; 29: Screening base.

[0037] 3: Sampling and diversion structure: 31: Butterfly valve motor; 32: Butterfly valve; 33: Funnel-shaped guide; 34: First diversion tube; 35: Scientific instrument cabinet; 36: Particle size analyzer; 37: Second diversion tube; 38: First sample carrier plate; 39: LIBS analyzer; 310: Second sample carrier plate.

[0038] 5: Bag feeding mechanism: 51: Bag feeding transport module; 52: Bag feeding guide rail; 53: Bag feeding rack; 54: Bag feeding gear; 55: Spacing adjustment guide rail; 56: Spacing adjustment rack; 57: Spacing adjustment module; 58: Drive motor; 59: Guide rail mounting plate; 510: Guide rail slider; 511: Compactor wheel.

[0039] 6: Bag opening, sealing, and vacuuming mechanism: 61: Insert rod type pipe joint; 62: Sealing ring; 63: Heat sealing strip; 64: Left clamping plate; 65: Right clamping plate; 66: Vacuum flow channel; 67: Transmission rod; 68: Cylinder; 69: Cylinder mounting plate; 610: Air rod fixing shaft; 611: Bag opening mechanism mounting slider and mounting rod; 612: Swing rod; 613: Bearing seat; 614: Synchronous transmission gear; 615: Miniature vacuum generator; 616: T-joint; 617: Outer shell; 618: Negative pressure hole.

[0040] 7: Bag weighing mechanism: 71: Pallet; 72: Strain gauge weight sensor; 73: Pallet bracket; 74: Lifting guide rail; 75: Power slider. Detailed Implementation

[0041] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0042] like Figures 1 to 6 As shown, this embodiment provides an integrated device for selective laser melting and recycling powder sieving, packaging, and testing. It includes a cabinet 1, a powder sieving mechanism 2 located on the upper part of the cabinet 1, a sampling and diversion structure 3 located below the powder sieving mechanism 2, a flexible powder guide 4 corresponding to the main powder drop path, a bag feeding mechanism 5 located inside the cabinet 1, a bag supporting, sealing, and vacuuming mechanism 6, a bag supporting and weighing mechanism 7, and an electrical cabinet and display 8 and a power supply module 9 located on the side of the cabinet. All driving components, detection components, and actuators are electrically connected to the control unit inside the electrical cabinet and display 8. The control unit sequentially controls the sieving, sampling, bag feeding, bag supporting, powder filling, vacuuming, heat sealing, weighing, and result output.

[0043] In this embodiment, the cabinet 1 is an enclosed box structure. An installation port communicating with the powder sieving mechanism 2 is provided on the upper surface of the cabinet 1. The powder sieving mechanism 2 is fixedly installed at this installation port, allowing the recycled powder to be processed to enter the powder sieving mechanism 2 from the top of the cabinet 1 for sieving. An electrical cabinet and a display 8 are located on the left side of the cabinet 1 to display information such as sieving mode, bag type specifications, current weight, and test results. An openable cabinet door is provided at the bottom of the cabinet 1, through which the packaged recycled powder can be removed.

[0044] like Figure 2As shown, the powder screening mechanism 2 includes a screening top cover 21, a first screen 22, a first screening barrel 23, a second screen 24, a second screening barrel 25, fasteners 26, guide rods 27, an ultrasonic vibrator 28, and a screening base 29. The sieving base 29 is fixed to the top of the cabinet 1. The sieving base 29 is a disc-shaped base structure with ears on both sides. Two guide rods 27 are provided and vertically installed on both sides of the sieving base 29. The first sieving barrel 23 and the second sieving barrel 25 are stacked vertically on the sieving base 29. The first screen 22 is installed in the first sieving barrel 23 and the second screen 24 is installed in the second sieving barrel 25. The screen holes of the upper screen are larger than those of the lower screen to form a two-stage sieving path. The sieving top cover 21 is placed on the top. The sieving top cover 21 has through holes on both sides for the guide rods 27 to pass through. Fasteners 26 (nuts with handles) are threaded onto the guide rods 27. By rotating the fasteners 26, the sieving top cover 21 can be tightened, thereby forming a relatively closed sieving space for the powder sieving mechanism 2. An ultrasonic vibrator 28 is installed on the outside of the screening base 29 or screening barrel and connected to the screen vibration structure. During operation, it provides ultrasonic vibration to the screen, causing the metal recycling powder to be evenly dispersed on the screen surface and fall through the screen holes, reducing agglomeration, bridging, and screen clogging. During operation, the recycling powder to be processed is added from above the screening top cover 21. Larger splash agglomerates, abnormal impurities, or sintered particles are preferentially retained on the first screen 22. Larger particles that pass through the first screen 22 but not the second screen 24 are retained on the second screen 24, while finer powder that meets the recycling requirements passes through the second screen 24 and enters the powder falling path below.

[0045] In this embodiment, the lower end of the second screening barrel 25 is connected to the funnel-shaped guide 33, and the lower end of the funnel-shaped guide 33 forms a main powder falling channel. The main powder falling channel is correspondingly set with the bag-supporting, sealing, and vacuuming mechanism 6 located at the packaging station below, so that the screened powder falls directly under the action of gravity. In order to reduce the deviation and scattering of powder during the falling process, a flexible powder guiding component 4 is set between the lower end of the funnel-shaped guide 33 and the bag-supporting, sealing, and vacuuming mechanism 6. The flexible powder guiding component 4 is preferably a flexible sleeve, a flexible guide hood, or a flexible powder guiding cloth component. Its upper end is connected to the funnel-shaped guide 33, and its lower end extends toward the bag opening area, thereby forming a relatively restricted powder guiding path during the powder filling process and reducing the risk of powder scattering.

[0046] like Figure 3As shown, the sampling diversion structure 3 is arranged in parallel with the main powder falling path. A sampling hole is provided on the side wall of the funnel-shaped guide 33, and a butterfly valve 32 is installed at the sampling hole. The butterfly valve 32 is driven to open and close and its opening degree is adjusted by a butterfly valve motor 31. A first diversion pipe 34 is connected to the butterfly valve 32. After extending outward, the first diversion pipe 34 branches into two second diversion pipes 37. The two second diversion pipes 37 preferably have a curved powder guiding structure, and their ends are both designed with oblique cuts to reduce sample powder impact, reduce dust generation, and allow the sample powder to slide smoothly in a predetermined direction. Below the two second diversion pipes 37, a first sample carrier plate 38 and a second sample carrier plate 310 are respectively installed; a scientific instrument cabinet 35 is installed on one side of the cabinet 1, with a particle size analyzer 36 located above the first sample carrier plate 38 and a LIBS analyzer 39 located above the second sample carrier plate 310; with this setup, most of the sieved powder still enters the packaging station along the main powder drop channel at the bottom of the funnel-shaped guide 33, while a small amount of sample powder enters the first diversion pipe 34 through the side sampling hole when the butterfly valve 32 is opened according to the set program, and slides down through the two second diversion pipes 37 into the first sample carrier plate 38 and the second sample carrier plate 310 respectively, thus forming an online dual-path sampling and detection structure that does not affect the main packaging process.

[0047] The particle size analyzer 36 preferably includes a laser emitting unit, an optical receiving unit, a mounting bracket, and a data processing unit. The powder sample falling into the first sample carrier 38 is located within the particle size detection area. The laser emitting unit emits a detection beam towards the sample, and the optical receiving unit receives the scattering or diffraction signals formed by the powder particles on the detection beam. The data processing unit calculates information such as particle size distribution parameters, the proportion of abnormally coarse particles, and the degree of particle size concentration based on the collected signals to determine whether the batch of recycled powder is within a preset reuse range. The LIBS analyzer 39 preferably includes a laser excitation unit, a focusing optical component, a plasma light-collecting component, a spectral analysis unit, and an analysis and control unit. The powder sample falling into the second sample carrier 310 is located within the LIBS detection area. The pulsed laser emitted by the laser excitation unit is focused onto the powder surface by the focusing optical component, causing localized plasma formation in the sample. The plasma emitted light is received by the light-collecting component and transmitted to the spectral analysis unit. The analysis and control unit performs rapid initial screening of preset key elements based on spectral peak information to identify the elemental shift trend of the recycled powder relative to the reference powder. This structure is not solely intended for obtaining precise quantitative results at the laboratory level, but rather for rapid online determination of the particle size and elemental composition of post-sieve recovered powder before packaging.

[0048] like Figure 1As shown, the bag feeding mechanism 5 is located on one side of the packaging station inside the cabinet 1, and is used to feed powder collection bags of different specifications to the bag-holding, sealing, and vacuuming mechanism 6. The bag feeding mechanism 5 includes three sets of bag feeding transport modules 51 and three sets of spacing adjustment modules 57. Each set of bag feeding transport modules 51 includes a bag feeding guide rail 52, a bag feeding rack 53 mounted on the bag feeding guide rail 52, a bag feeding gear 54 meshing with the bag feeding rack 53, a drive motor driving the bag feeding gear 54, a motor mounting plate for mounting the drive motor, a guide rail slider, and other components. The guide rail slider is slidably mounted on the bag feeding guide rail 52. The drive motor 58 drives the bag feeding gear 54 to mesh with the bag feeding rack 53, thereby causing the corresponding transport component to move along the length direction (front and back) of the bag feeding guide rail 52. The three sets of bag feeding transport modules 51 are respectively connected to the spacing adjustment modules 57 through the guide rail mounting plate 59. The spacing adjustment module 57 includes a spacing adjustment guide rail 55, a spacing adjustment rack 56 fixedly mounted on the spacing adjustment guide rail 55, a gear meshing with the spacing adjustment rack 56, a drive motor 58 driving the gear to rotate, and a guide rail slider 510 cooperating with the spacing adjustment guide rail 55. This spacing adjustment module 57 is used to adjust the lateral spacing between the three sets of bag-feeding transport modules 51. In this embodiment, the middle set of spacing adjustment modules 57 can move relative to the two side spacing adjustment modules 57 (of course, the other two sets of spacing adjustment modules 57 can also move relative to each other) to accommodate powder collection bags of different widths. Two of the three sets of bag-feeding transport modules 51 are used to clamp the two sides of the bag opening (by a pair of crushing rollers mounted on the guide rail slider of each set of bag-feeding transport modules 51 to crush and tighten the upper part of the bag). During operation, the control unit, according to the bag type selected on the display, first drives the spacing adjustment module 57 to adjust the relative spacing of the three transport modules, and then drives each bag-feeding transport module. 51 moves in the front-back direction, sending the target powder collection bag from the bag supply tray (not shown in the diagram, which mainly includes a tray body that holds a large number of vertically arranged packaging bags, and a roller that presses against the surface of the outermost packaging bag on the side of the tray body near the bag feeding and transport module 51. When the roller rotates, the outermost packaging bag moves upward to approach a pair of crushing rollers 511 on the bag feeding and transport module 51. The crushing rollers are driven by a motor to clamp the packaging bag) to the bag supporting, sealing and vacuuming mechanism 6; after the bag feeding is completed, the bag feeding and transport module 51 can return to the initial bag storage position to wait for the next bag feeding.

[0049] like Figure 4 and Figure 5As shown, the bag-sealable vacuum mechanism 6 is located directly below the main powder discharge channel. It includes a left clamping plate 64, a right clamping plate 65, a vacuum channel 66 (formed by a tube body) located below the left and right clamping plates 64 and 65, a sealing ring 62 on the opposite surface of the vacuum channel 66 tube body located below the clamping plates, a heat-sealing strip 63 located below the sealing ring 62 on the lower part of the clamping plates, a miniature vacuum generator 615, a three-way pipe connector 616 connected to the miniature vacuum generator 615, and a plug-in type pipe connector 61 installed at the opening of the vacuum channel 66 (the plug-in type pipe connector 61 connects to the three-way pipe connector). The system includes a head 616 (connected via a pipe), a cylinder 68 for driving the right clamping plate 65 to swing, a cylinder mounting plate 69 for mounting the cylinder 68, a cylinder rod fixing shaft 610 connected to the cylinder mounting plate 69 and mounted on the machine body, a swing rod 612 connected at the lower part to the left clamping plate 64 and the right clamping plate 65 respectively, a transmission rod 67 connected to the free end of the cylinder 68 telescopic rod and the right clamping plate 65, a synchronous transmission gear 614 mounted on the upper part of the swing rod 612, a bearing seat 613 for mounting the synchronous transmission gear 614, a bag-supporting mechanism mounting slider and mounting rod 611, and a housing 617. The left clamping plate 64 and the right clamping plate 65 are arranged opposite each other and installed in the housing 617. They can open or close synchronously under the drive of the swing rod 612 and the synchronous transmission gear 614. The miniature vacuum generator 615 is connected to the vacuum channel 66 on the left and right clamps via a three-way pipe joint 616 and a pipe. The sealing ring 62 is set in the relative contact area of ​​the upper part of the clamps. Furthermore, negative pressure holes communicating with the vacuum channel 66 are densely distributed on the tube body of the vacuum channel 66 and within the area enclosed by the sealing ring 62. The heat sealing strip 63 is set at the relative position of the lower part of the two clamps.

[0050] In this embodiment, the working process of the bag-seal-vacuum mechanism 6 is as follows: After the powder collection bag is transported to the designated station by the bag feeding mechanism 5, the micro vacuum generator 615 is started first, and the vacuum channel 66 is evacuated through the three-way pipe joint 616, so that the two sides of the bag opening are attached to the left clamping plate 64 and the right clamping plate 65 respectively under the action of negative pressure, thereby realizing the automatic adsorption positioning of the bag opening and the initial opening of the bag; then, the cylinder 68 is activated, and the swing rod 612 and the right clamping plate are driven to rotate through the transmission rod 67, that is, the swing rod 612 drives the right clamping plate 65 to swing outward, and at the same time, the rotation is synchronously transmitted to the other side swing rod 612 through the synchronous transmission gear 614, so that the left and right clamping plates open synchronously, thereby opening the bag opening and maintaining a stable opening state; the powder in the main powder drop channel is guided into the opened bag body through the flexible powder guide 4 to realize continuous powder filling. After the powder filling is completed, cylinder 68 reverses its direction, causing the left and right clamps to swing back and close. When the sealing rings 62 are in contact with each other, the upper part of the bag opening and the sealing rings 62 form a partially sealed area. The micro vacuum generator 615 continues to work, extracting the gas inside the bag through the vacuum channel 66. After the preset vacuuming time or preset vacuum conditions are reached, the heat sealing strip 63 is energized and heats up, heat-sealing the bag opening to form a seal. After heat sealing is completed, the micro vacuum generator 615 stops working and the negative pressure is released. The left and right clamps 64 and 65 open again, and the sealed powder collection bag falls onto the bag-supporting weighing mechanism 7 below under gravity. Thus, the bag opening adsorption, synchronous bag opening, partial vacuuming, and heat sealing can be completed sequentially using the same pair of clamps, without the need to transfer the powder-filled bag to an independent vacuum chamber for secondary sealing.

[0051] like Figure 6As shown, the bag weighing mechanism 7 is located directly below the bag supporting, sealing, and vacuuming mechanism 6, and includes a tray 71, a strain gauge weight sensor 72, a tray support 73, a lifting guide rail 74, and a power slider 75. The tray 71 is connected to the tray support 73 via the strain gauge weight sensor 72 (i.e., the lower part of the tray 71 is connected to the strain gauge weight sensor 72, and the lower part of the strain gauge weight sensor 72 is connected to the tray support 73). The strain gauge weight sensor 72 is preferably a strain gauge weight sensor used to output the weight signal of the powder inside the bag in real time. The tray support 73 is connected to the power slider 75, which can move up and down along the lifting guide rail 74, thereby driving the tray 71 to rise and fall. In the initial powder filling stage, the distance between the tray 71 and the bag-supporting, sealing, and vacuuming mechanism 6 is approximately equal to the length of the packaging bag. The tray 71 is used to support empty bags or semi-finished bags and works with the bag-supporting, sealing, and vacuuming mechanism 6 to maintain the bag's posture. When the strain gauge weight sensor 72 detects that the weight of the powder inside the bag has reached the preset linkage threshold, and after the powder filling, partial vacuuming, and heat sealing actions are completed (negative pressure adsorption is not working), the sealed bag falls completely onto the tray 71, and the tray 71 is moved to the lowest position for easy removal. When the output value of the strain gauge weight sensor 72 stabilizes, the control unit displays the final weight on the display and can simultaneously output the corresponding batch packaging record information.

[0052] In this embodiment, the detection results of both the particle size analyzer 36 and the LIBS analyzer 39 are sent to the control unit. The control unit preferably includes a data acquisition subunit, a quality evaluation subunit, a parameter mapping subunit, and a communication subunit. The data acquisition subunit receives particle size distribution parameters, the proportion of abnormal coarse particles, and elemental offset information. The quality evaluation subunit determines the reusability of the batch of recycled powder based on preset thresholds, empirical rules, or evaluation models. When the detection results indicate an increase in the proportion of abnormal coarse particles, a deviation of the particle size distribution from the preset range, an increase in irregular particle characteristics, and / or an offset trend of key elements exceeding the allowable range, the parameter mapping subunit generates corresponding printing parameter corrections and sends them to the SLM device controller or host computer via the communication subunit for adjusting laser power, scanning speed, scanning spacing, and energy density-related parameters in subsequent printing processes. Therefore, this embodiment not only completes the sieving, packaging, and weighing of recycled powder but also enables online quality verification of the sieved recycled powder before packaging and uses the detection results to optimize subsequent printing processes.

[0053] The complete workflow of this embodiment is as follows: First, according to the batch of powder to be packaged and the target packaging specifications, select the corresponding sieving mode and powder collection bag specifications on the display, install the first screen 22 and the second screen 24 with the corresponding mesh size, and switch the bag feeding mechanism 5 to the corresponding bag type position by the spacing adjustment module 57; then, add the powder to be processed into the powder sieving mechanism 2, and start the ultrasonic vibrator 28 for sieving; at the same time, the bag feeding mechanism 5 sends the target powder collection bag to the bag opening, sealing and vacuuming mechanism 6, the micro vacuum generator 615 is started to make the bag mouth adsorb and position, and the cylinder 68 drives the left and right clamps 64 and 65 to open synchronously to complete the bag opening; the powder after two-stage sieving enters the bag body through the funnel-shaped guide 33 and the flexible powder guide 4; during the main powder dropping process, the butterfly valve motor 31 operates according to the set time, set opening degree or based on the cumulative powder loading amount. The control strategy drives the butterfly valve 32 to open, allowing a small amount of sample powder to enter the first diversion pipe 34 and the second diversion pipe 37, and fall into the first sample carrier tray 38 and the second sample carrier tray 310 respectively. The particle size analyzer 36 and the LIBS analyzer 39 simultaneously complete the detection. When the strain gauge weight sensor 72 detects that the powder weight has reached the preset value, the control unit stops the main powder dropping and controls the tray 71 to descend appropriately. Then, it controls the left and right clamps to close, uses the sealing ring 62 to form a partially sealed space at the bag opening and draws a vacuum, and then the heat sealing strip 63 completes the heat sealing. After the heat sealing is completed, the left and right clamps open, and the sealed powder collection bag is held by the tray 71. The tray 71 descends to the material collection position and outputs the final weight. Finally, the operator can open the lower cabinet door of the cabinet 1 to take out the finished recycled powder product that has completed screening, detection, packaging and weighing.

[0054] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of structures based on the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A selective laser melting and recycling powder sieving, packaging, and testing integrated device, characterized in that, The system includes a cabinet (1), a powder screening mechanism (2), a sampling and diversion structure (3), a bag feeding mechanism (5), a bag supporting, sealing, and vacuuming mechanism (6), a bag supporting and weighing mechanism (7), and a control unit. The powder screening mechanism (2) is located on the upper part of the cabinet (1), and the sampling and diversion structure (3) is located downstream of the powder screening mechanism (2). The bag feeding mechanism (5), the bag supporting, sealing, and vacuuming mechanism (6), and the bag supporting and weighing mechanism (7) are arranged sequentially from top to bottom along the main powder drop path to complete the bagging, sealing, vacuuming, and weighing of the recycled powder. The sampling and diversion structure (3) is connected to the main powder drop path to intermittently obtain a portion of the recycled powder from the main powder drop path. The cabinet (1) is equipped with a particle size analyzer (36) and a LIBS analyzer (39) to detect a portion of the recycled powder obtained by the sampling and diversion structure (3). The control unit is electrically connected to each mechanism.

2. The integrated device according to claim 1, characterized in that, The powder screening mechanism (2) includes a screening base (29), at least two layers of first screen (22) and second screen (24) stacked on the screening base (29), a screening top cover (21), a guide rod (27), a fastener (26) and an ultrasonic vibrator (28); the first screen (22) has a larger mesh than the second screen (24), the screening top cover (21) is placed on top, and is pressed and fixed on the first screen (22), the second screen (24) and the screening base (29) by the guide rod (27) and the fastener (26) so that the powder screening mechanism (2) forms a relatively closed screening space, and the ultrasonic vibrator (28) is installed on the outside of the screening base (29) to apply vibration to the screen.

3. The integrated device according to claim 1, characterized in that, The sampling diversion structure (3) includes a funnel-shaped guide (33), a side wall sampling hole provided on the funnel-shaped guide (33), a controllable butterfly valve (32), a first diversion pipe (34), a second diversion pipe (37), a first sample carrier plate (38), and a second sample carrier plate (310). When the butterfly valve (32) is opened, some of the recovered powder flows through the first diversion pipe (34) and the second diversion pipe (37) to the first sample carrier plate (38) and the second sample carrier plate (310), respectively. The particle size analyzer (36) and the LIBS analyzer (39) are respectively facing the first sample carrier plate (38) and the second sample carrier plate (310) to detect the recovered powder that falls into them.

4. The integrated device according to claim 1, characterized in that, The bag feeding mechanism (5) includes three sets of bag feeding and transport modules (51) and three sets of spacing adjustment modules (57); the spacing adjustment module (57) is slidably installed on the spacing adjustment guide rail (55) fixed on the cabinet (1) to adjust the spacing of the spacing adjustment module (57) to adapt to different sizes of packaging bags; each spacing adjustment module (57) is provided with a guide rail mounting plate (59) and a bag feeding guide rail (52) installed on the guide rail mounting plate (59). The bag feeding guide rail (52) is slidably installed with the bag feeding and transport module (51). The three sets of bag feeding and transport modules (51) cooperate in pairs to send the empty bag to the bag holding, sealing and vacuuming mechanism (6).

5. The integrated device according to claim 1, characterized in that, The bag-seal vacuuming mechanism (6) includes a left clamp (64) and a right clamp (65) that can open and close relative to each other. The lower part of the left clamp (64) and the right clamp (65) is provided with a vacuum channel (66) and a sealing ring (62) attached to the wall of the vacuum channel (66). The area enclosed by the sealing ring (62) is provided with a negative pressure hole that communicates with the vacuum channel (66) for adsorbing the bag opening. At the same time, a heat sealing strip (63) is provided on the lower side of the sealing ring (62) to heat seal the bag opening.

6. The integrated device according to claim 1, characterized in that, The bag weighing mechanism (7) includes a tray (71) for receiving the packaging bag, a strain gauge weight sensor (72) located below the tray (71), a lifting guide rail (74) and a lifting drive component; the tray (71) supports the packaging bag and weighs it in real time, and when the weight reaches a preset threshold, the lifting drive component drives the lifting guide rail (74) and the tray (71) to move down.

7. The integrated device according to claim 5, characterized in that, The left clamp (64) and the right clamp (65) are rotatably connected to the cabinet (1) by swing rods (612). The upper end of the swing rod (612) is equipped with a synchronous transmission gear so that the swing rod (612) can swing synchronously. The right clamp (65) is hinged to the free end of the telescopic rod of a cylinder so that the cylinder drives the right clamp (65) to swing, and then synchronously drives the left clamp (64) to swing.

8. The integrated device according to claim 3, characterized in that, The end of the second diversion tube (37) has a slanted cut structure to reduce the impact and dust of the sample powder, so that the sample powder falls smoothly into the corresponding first sample carrier plate (38) and second sample carrier plate (310).

9. The integrated device according to claim 1, characterized in that, A flexible powder guide (4) is provided between the main powder drop channel and the bag sealing and vacuuming mechanism (6) to limit powder scattering and improve the directionality and stability of powder drop.

10. A method for operating a selective laser melting and recycling powder sieving, packaging, and testing integrated device, characterized in that: Includes the following steps: The recovered powder enters the sieving mechanism (2) to complete multi-stage ultrasonic sieving; The bag feeding mechanism (5) delivers the packaging bag to the packaging station, and the bag opening, sealing and vacuuming mechanism (6) completes the adsorption and opening of the bag to open the bag mouth; the sieved powder is loaded into the packaging bag body through the main powder drop channel, and at the same time, the side sampling and diversion structure (3) diverts the sample powder, which is then detected online by the particle size analyzer (36) and the LIBS analyzer (39), and the sieved powder is judged to be qualified according to the test results; after the bag holding and weighing mechanism (7) detects that the weight of the packaging bag reaches the preset weight, the bag opening, sealing and vacuuming mechanism (6) performs bag mouth closure, vacuuming and heat sealing; after the packaging is completed, the tray moves down, the control unit outputs the weight value, and the operator takes out the packaging bag containing the recycled powder.

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