Metal powder distribution state measuring device for additive manufacturing

Abstract

The invention discloses a metal powder distribution state measuring device for additive manufacturing, which relates to the technical field of measurement and comprises a powder cleaning bin, a partition plate component, a powder collecting table system and a laser sensor. The powder cleaning bin is a columnar shell with an opening in the bottom, a through hole for the powder feeding head to extend in is eccentrically formed in the top wall of the powder cleaning bin, and a laser sensor for detecting the position of the powder feeding head is arranged at the through hole; the partition plate component is rotatably arranged in the powder cleaning bin, and when powder is fed, an annular powder passing area with the rotating axis of the partition plate component in the powder cleaning bin as the center is formed on the partition plate component. The inner and outer reference areas are divided through the partition circle, the performance states of different areas of the powder feeding head are independently analyzed, the rotary partition plate component and the synchronous collecting ring replace traditional instantaneous opening and closing, the actual continuous powder feeding working condition is better fitted, meanwhile, negative pressure equipment does not need to be synchronously started to suck powder synchronously in the powder feeding process, and the production efficiency is improved. And the influence of airflow disturbance and powder residue on measurement is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement, and specifically to a device for measuring the distribution state of additive manufacturing metal powder. Background Art

[0002] In powder-fed additive manufacturing (such as laser metal deposition LMD), the distribution uniformity of the powder flow, the wear state of the powder feeder head, and the assembly error directly affect the forming quality.

[0003] Chinese Patent Publication No. CN115901755B discloses a device for measuring the powder distribution state in powder-fed additive manufacturing. Although this patent can measure the powder distribution state of additive manufacturing at different positions by controlling the height of the collection table, and obtain the complete powder distribution by superimposing the measurement structures at different positions; and reflect the wear degree and assembly error of the powder feeder nozzle through the measurement of the powder distribution. However, there are still the following defects in its measurement process: 1. Contradiction between powder accumulation and detection accuracy: The closing of the switch blade or the design of the arc-shaped groove of the track disk easily leads to local powder retention, and a complex powder cleaning system (such as a negative pressure vacuum cleaner) is required, but the cleaning efficiency is low and the maintenance cost is increased.

[0004] 2. Airflow interference problem: During the measurement process, a negative pressure adsorption system is relied on to clean the residual powder, and the negative pressure adsorption will disrupt the airflow around the powder feeder nozzle, resulting in powder flow deviation or accumulation, affecting the powder feeding stability.

[0005] 3. Limitations of short-term powder feeding and dynamic detection: Using instantaneous opening and closing collection (switch blade structure), the measurement time is short (<10 seconds), and it is difficult to reflect the true distribution of continuous powder feeding.

[0006] In view of the above problems, it is urgent to develop a device for measuring the powder distribution state that can achieve dynamic continuous measurement, reduce airflow interference, accurately detect, and adapt to multiple scenarios. Summary of the Invention

[0007] The purpose of the present invention is to provide a device for measuring the distribution state of additive manufacturing metal powder to solve the problems raised in the above background art.

[0008] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions: A device for measuring the distribution state of additive manufacturing metal powder provided by the present invention includes a powder cleaning bin, a partition member, a powder collection table system and a laser sensor; the powder cleaning bin has a columnar outer shell with an open bottom, and a through hole for a powder feeding head to extend into is opened at an eccentric position on the top wall, and a laser sensor for detecting the position of the powder feeding head is arranged at the through hole; the partition member is rotatably arranged in the powder cleaning bin, and when powder is fed, an annular powder passing area centered on the rotation axis of the partition member in the powder cleaning bin is formed on the partition member, and a first powder passing groove, a second powder passing groove and a third powder passing groove are sequentially arranged along the circumferential direction of the annular powder passing area; A separation circle is a circle that passes through the first powder passing groove centered on an arc line and whose center coincides with the annular powder passing area. The first powder passing groove includes a first part and a second part distributed on both sides of the separation circle, and the width of the first powder passing groove decreases to a tip along the counterclockwise direction; the second powder passing groove has the same shape as the first part and is located outside the separation circle, and the third powder passing groove has the same shape as the second part and is located inside the separation circle; the powder collection table system includes a powder collection ring that rotates synchronously with the partition member, and the powder collection ring is divided into three collection areas corresponding to the first powder passing groove, the second powder passing groove and the third powder passing groove; when the powder feeding head extends into the powder cleaning bin through the through hole to feed powder, the powder flow sequentially passes through the first powder passing groove, the second powder passing groove and the third powder passing groove and falls into the corresponding collection area.

[0009] Further, the partition member includes a rotating cylinder rotatably assembled in the powder cleaning bin and a cover body composed of a circular bottom plate and a surrounding plate. The first powder passing groove, the second powder passing groove and the third powder passing groove are opened on the circular bottom plate, and blocking plates are formed by upward extension of the edges of the first powder passing groove, the second powder passing groove and the third powder passing groove, and vibration modules are arranged on the blocking plates.

[0010] Further, an annular space capable of covering the powder collection ring is formed in the rotating cylinder below the cover body, the columnar outer shell is movably installed above the powder collection table system through a lifting mechanism, and a powder storage groove is formed in the cover body.

[0011] Further, the lifting mechanism includes screw rod assemblies symmetrically arranged on both sides of the columnar outer shell. The screw rod assemblies include vertical plates, screw rods, screw blocks and servo motors. The screw rods are rotatably assembled on the vertical plates, the screw blocks are vertically slidably matched with the vertical plates through sliding pairs and are in transmission connection with the screw rods, and the screw blocks are fixedly connected to the side walls of the columnar outer shell through connecting pieces, and the servo motors are used to drive the screw rods to rotate.

[0012] Further, the powder collection table system further includes a substrate, a mounting cylinder and a rotating seat. The mounting cylinder is coaxially fixed at the center of the substrate, the rotating seat is driven to rotate through a servo mechanism, and an annular embedding groove is arranged at the top thereof, and the powder collection ring is detachably embedded in the annular embedding groove.

[0013] Furthermore, the partition member and the powder collection table system are linked by a transmission mechanism. The transmission mechanism includes a connecting shaft coaxially fixed to the bottom of the circular base plate and a plugging shaft hole opened at the central position of the rotating seat. A protruding strip is provided on the outer side wall of the connecting shaft, and a limiting cylinder member is arranged in the plugging shaft hole. A guiding surface is obliquely arranged at the top of the limiting cylinder member, and a card slot adapted to the protruding strip is penetrated through the limiting cylinder member at the lowest end of the guiding surface.

[0014] Furthermore, a negative pressure mechanism is further arranged in the powder storage tank. The negative pressure mechanism includes a suction head and a negative pressure pipe. The suction head is symmetrically arranged with the through hole and is arranged above the annular area. There are two suction ports on the suction head, and the suction ports are distributed on both sides of the annular powder passing area. One end of the negative pressure pipe is communicated with the suction head, and the other end of the negative pressure penetrates through the top wall of the columnar housing and is connected with an external negative pressure device.

[0015] Furthermore, the laser sensor is composed of a laser emitting end and a laser receiving end, and the laser emitting end and the laser receiving end are symmetrically arranged on both sides of the through hole.

[0016] Furthermore, the tips of the first powder passing groove, the second powder passing groove, and the third powder passing groove are 0.5-1 mm, the width of the starting end is 3-5 mm, and the surface of the groove is coated with a polytetrafluoroethylene anti-sticking coating.

[0017] Compared with the prior art, the above one or more technical solutions have the following beneficial effects: 1. By controlling the synchronous rotation of the rotating partition member and the powder collection ring, the present invention realizes the dynamic partition continuous collection of the powder flow in the additive manufacturing process, overcomes the short-time error of the traditional instantaneous opening and closing measurement (time < 10 seconds), is more suitable for the actual continuous powder feeding condition, and improves the detection accuracy.

[0018] 2. The present invention uses a vibration module (5-10 Hz) and an anti-sticking coating (polytetrafluoroethylene) to replace the traditional negative pressure adsorption system, avoids the powder flow deviation caused by air flow disturbance, and improves the measurement stability.

[0019] 3. Based on the reference area divided by the dividing circle, the present invention independently captures the powder flow through the second powder passing groove (outer side) and the third powder passing groove (inner side), accurately locates the wear or blockage of the powder feeding head, improves the detection efficiency, and provides direct data support for process optimization.

[0020] 4. The present invention has a detachable powder collection ring linked with the lifting mechanism, which supports the rapid adaptation of different powder feeding head parameters (diameter, powder feeding amount).

[0021] In summary, through dynamic zoning, synchronous transmission and structural innovation, the present invention solves the problems of air flow interference, short-time measurement error and complex maintenance in the traditional technology.

[0022] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic top view structure diagram of the present invention; Figure 3 is Figure 2 a schematic structure diagram taken along the A-A direction of Figure 4 is Figure 2 a schematic structure diagram taken along the B-B direction of Figure 5 is a schematic structure diagram of the present invention after removing the top wall of the main shaft housing; Figure 6 is Figure 5 a schematic top view structure diagram of Figure 7 is a schematic structure diagram of the powder collection table system of the present invention; Figure 8 is a schematic bottom view structure diagram of the partition member of the present invention; Figure 9 is Figure 7 a schematic partial structure diagram at position A of

[0025] In the figure: 1 - cleaning powder bin; 11 - columnar housing; 12 - through hole; 2 - partition member; 21 - annular powder passing area; 22 - first powder passing groove; 221 - first part; 222 - second part; 23 - second powder passing groove; 24 - third powder passing groove; 25 - dividing circle; 26 - rotating cylinder; 27 - cover body; 271 - circular bottom plate; 272 - surrounding plate; 273 - powder storage groove; 28 - blocking plate; 29 - annular space; 3 - powder collection table system; 31 - powder collection ring; 33 - substrate; 34 - mounting cylinder; 35 - rotating seat; 36 - annular embedding groove; 41 - laser emitting end; 42 - laser receiving end; 51 - lead screw assembly; 52 - vertical plate; 53 - lead screw; 54 - lead screw block; 55 - servo motor; 61 - connecting shaft; 62 - inserting shaft hole; 63 - clamping strip; 64 - limiting cylinder member; 641 - guiding surface; 642 - clamping groove; 72 - suction head; 73 - negative pressure pipe; 74 - suction port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0027] Please refer to Figures 1 - 9 , the present invention provides a device for measuring the distribution state of additive manufacturing metal powder, including a powder cleaning bin 1, a partition member 2, a powder collection table system 3 and a laser sensor; As Figure 1 and Figure 3 shown, the powder cleaning bin 1 has a columnar outer shell 11 with an open bottom, and a through hole 12 for the powder feeding head to extend into is provided at an eccentric position on the top wall. A laser sensor for detecting the position of the powder feeding head is provided at the through hole 12; the partition member 2 is rotatably arranged in the powder cleaning bin 1. As Figure 5 and Figure 6 shown, when powder is fed, a circular powder passing area 21 centered on the rotation axis of the partition member 2 in the powder cleaning bin 1 is formed on the partition member 2. The circular powder passing area 21 is sequentially provided with a first powder passing groove 22, a second powder passing groove 23 and a third powder passing groove 24 along the circumferential direction; a dividing circle is a circle that passes through the first powder passing groove 22 centered on an arc line and whose center coincides with the circular powder passing area 21. The first powder passing groove 22 includes a first part 221 and a second part 222 located on both sides of the dividing circle 25. The width of the first powder passing groove 22 decreases along the counterclockwise direction until a tip is formed; the groove shape of the second powder passing groove 23 is the same as that of the first part 221 and is located outside the dividing circle 25, and the groove shape of the third powder passing groove 24 is the same as that of the second part 222 and is located inside the dividing circle 25; As Figure 4 shown, the powder collection table system 3 includes a powder collection ring 31 that rotates synchronously with the partition member 2. The powder collection ring 31 is divided into three collection areas corresponding to the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24; when the powder feeding head extends into the powder cleaning bin 1 through the through hole 12 to feed powder, the powder flow sequentially passes through the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24 and falls into the corresponding collection areas.

[0028] Based on the above settings, in this embodiment, compared with the prior art where the powder feeding head and the collection table remain stationary and powder is collected by the opening and closing of an instantaneous switch, only a set of powder state data can be obtained. In the present invention, when the powder feeding head extends into the eccentric through hole 12 on the top wall of the powder cleaning bin 1 and after the laser sensor determines that its position is in place, during powder feeding, the partition member 2 and the powder collection ring 31 rotate synchronously in a clockwise and uniform speed. As the partition member 2 rotates, the powder flow ejected by the powder feeding head sequentially passes through the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24, and is divided into zones and falls into the corresponding collection areas of the powder collection ring 31. Among them, the first powder passing groove 22 guides the powder flow in the middle of the whole powder feeding head to fall downward to the corresponding collection area; the second powder passing groove 23 is located outside the separation circle 25, and its groove shape is the same as the outer half section (the first part 221) of the first powder passing groove 22, capturing the powder flow outside the powder feeding head; the third powder passing groove 24 is located inside the separation circle 25, and its groove shape is the same as the inner half section (the second part 222) of the first powder passing groove 22, capturing the powder flow inside the powder feeding head. The present invention can collect three sets of powder state data through the collection areas corresponding to the three powder passing grooves (the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24), and the three sets of powder state data can be compared and verified. More importantly, compared with sampling and detecting the powder collected within a period of time (time < 10 seconds) after instantaneous opening and closing, the continuous dynamic sampling is adopted, which is more in line with the actual continuous powder feeding working condition and can simulate the powder particle size and distribution state under the actual powder feeding state.

[0029] In addition, the morphological characteristics of the specially designed first powder passing groove 22, second powder passing groove 23, and third powder passing groove 24 of the present invention can also intuitively obtain the spatial distribution state of the powder ejected by the powder feeding head by comparing the powder in the collection areas corresponding to the second powder passing groove 23 and the third powder passing groove 24 with the powder corresponding to the first powder passing groove 22.

[0030] Since the above powder feeding is dynamic powder feeding, there is no need to synchronously start the negative pressure device to suck powder synchronously during the powder feeding process, eliminating the influence of air flow disturbance and powder residue on the measurement.

[0031] As Figure 3 shown, in this embodiment, the partition member 2 includes a rotating cylinder 26 rotatably assembled in the powder cleaning bin 1, and a cover body 27 composed of a circular bottom plate 271 and a surrounding plate 272. Combining Figure 5 shown, the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24 are opened on the circular bottom plate 271, and blocking plates 28 are formed by upward extension of the edges of the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24, and a vibration module (not shown) is provided on the blocking plates 28.

[0032] Based on the above settings, the baffle 28 can form a physical barrier at the edges of the first powder passing trough 22, the second powder passing trough 23, and the third powder passing trough 24, restricting the powder to flow only within the trough path and preventing cross-contamination of powders in different regions. During the powder feeding process by the powder feeding head, the vibration module can cause the baffle 28 to vibrate periodically, shaking off the residual powder (especially the accumulation in the narrow tip regions) through high-frequency and small-amplitude vibrations, ensuring the smoothness of the powder passing trough and the measurement consistency.

[0033] Furthermore, the vibration module (not shown) can start and stop synchronously with the rotation action (for example, vibrating for 5 seconds per rotation), avoiding vibration interference with the dynamic collection process.

[0034] As Figure 3 shown, in this embodiment, a ring-shaped space 29 capable of covering the powder collection ring 31 is formed inside the rotating cylinder 26 below the cover 27. The columnar outer shell 11 is movably installed above the powder collection table system 3 through a lifting mechanism, and a powder storage trough 273 is formed inside the cover 27.

[0035] Based on the above settings, the height between the columnar outer shell 11 and the powder collection table system 3 can be flexibly adjusted through the lifting mechanism to measure the powder distribution states of multiple groups for additive manufacturing at different positions. After stopping the powder feeding, the lifting mechanism can lift the columnar outer shell 11 to expose the powder collection ring 31 for taking out and analysis. The setting of the powder storage trough 273 can temporarily store the powder that fails to directly pass through the first powder passing trough 22, the second powder passing trough 23, and the third powder passing trough 24 (hereinafter referred to as the powder passing trough), avoiding the disorderly accumulation of powder inside the cover 27 or blocking the entrance of the powder passing trough.

[0036] In this embodiment, the lifting mechanism includes screw rod assemblies 51 symmetrically arranged on both sides of the columnar outer shell 11. The screw rod assembly 51 includes a vertical plate 52, a screw rod 53, a screw block 54, and a servo motor 55. The screw rod 53 is rotatably assembled on the vertical plate 52. The screw block 54 is vertically slidably matched with the vertical plate 52 through a sliding pair and is in transmission connection with the screw rod 53. The screw block 54 is fixedly connected to the side wall of the columnar outer shell 11 through a connecting member, and the servo motor 55 is used to drive the screw rod 53 to rotate.

[0037] Based on the above settings, during use, according to the position of the powder feeding head or process requirements, the control system (not shown) sends a target height instruction (such as 30 mm). After receiving the instruction, the servo motors 55 on both sides are synchronously started, driving the lead screw 53 to rotate at a set speed (such as 50 rpm). The wire block 54 moves up or down along the thread pair of the lead screw 53, driving the powder cleaning bin 1 to vertically lift and lower through the connecting piece. The encoder (not shown) monitors the rotation angle of the lead screw 53 in real time, converts it into the actual height of the powder cleaning bin 1, and dynamically adjusts the rotation speed of the servo motor 55 until the target position is reached (accuracy ±0.05 mm). After reaching the target height, the servo motor 55 enters the self-locking mode, maintaining the position stability through static friction to resist external vibration or load changes.

[0038] Such as Figure 3 As shown, in this embodiment, the powder collection table system 3 further includes a substrate 33, a mounting cylinder 34, and a rotating seat 35. The mounting cylinder 34 is coaxially fixed at the center of the substrate 33. The rotating seat 35 is driven to rotate by a servo mechanism, and a ring-shaped embedding groove 36 is provided at its top. The powder collection ring 31 is detachably embedded in the ring-shaped embedding groove 36.

[0039] Based on the above settings, the substrate 33 serves as an overall support platform to ensure the coaxial fixation of the mounting cylinder 34, reduce vibration interference, and improve measurement stability. The mounting cylinder 34 is coaxially fixed at the center of the substrate 33, with a rotating seat 35 provided inside and driven to rotate by a servo mechanism to ensure synchronous movement with the partition member 2. The ring-shaped embedding groove 36 is provided at the top of the rotating seat 35, and the powder collection ring 31 can be detachably installed inside, allowing for quick replacement of different specifications of collection rings to adapt to different powder feeding head parameters (such as diameter, powder feeding amount).

[0040] Combined with Figure 3 、 Figure 4 、 Figure 7 And Figure 8 As shown, in this embodiment, the partition member 2 and the powder collection table system 3 are linked by a transmission mechanism. The transmission mechanism includes a connecting shaft 61 coaxially fixed to the bottom of the circular bottom plate 271 and a plug-in shaft hole 62 opened at the center position of the rotating seat 35. An outwardly protruding clamping strip 63 is provided on the outer side wall of the connecting shaft. A limiting cylinder member 64 is provided in the plug-in shaft hole 62. A guiding surface 641 is inclined at the top of the limiting cylinder member 64, and a clamping groove 642 adapted to the clamping strip 63 is penetrated through the limiting cylinder member 64 at the lowest end of the guiding surface 641.

[0041] Based on the above settings, during use, simply drive the cylindrical outer shell 11 to descend through the inclined guiding surface 641 at the top of the limiting cylinder member 64, and the positions of the clamping strip 63 and the clamping groove 642 can be automatically corrected, reducing hard collisions and optimizing the contact trajectory. When the protruding clamping strip 63 on the outer side of the connecting shaft 61 is embedded in the clamping groove 642 of the limiting cylinder member 64, a rigid interlock can be formed to ensure the coaxiality of power transmission, thereby ensuring that the annular collecting ring can move synchronously with the partition member 2.

[0042] As Figure 4 shown, in this embodiment, a negative pressure mechanism is further provided in the powder storage tank 273. The negative pressure mechanism includes a suction head 72 and a negative pressure pipe 73. The suction head 72 is symmetrically arranged with the through hole 12 and is arranged above the annular area, and the suction head 72 has two suction ports 74, and the suction ports 74 are distributed on both sides of the annular powder passing area 21. One end of the negative pressure pipe 73 is communicated with the suction head 72, and the other end of the negative pressure penetrates the top wall of the cylindrical outer shell 11 and is connected to an external negative pressure device.

[0043] Based on the above design, after completion, the external negative pressure device is started. By rotating the partition member 2, the suction head 72 can simultaneously adsorb the residual powder inside and outside the powder storage tank 273 through the double suction ports 74, avoiding accumulation and affecting subsequent measurements.

[0044] In this embodiment, the laser sensor is composed of a laser emitting end 41 and a laser receiving end 42, and the laser emitting end 41 and the laser receiving end 42 are symmetrically arranged on both sides of the through hole 12.

[0045] In this embodiment, the tips of the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24 are 0.5 - 1 mm, the starting end width is 3 - 5 mm, and the groove surface is coated with a polytetrafluoroethylene anti-sticking coating.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A measuring device for the distribution state of metal powder in additive manufacturing, characterized in that, It comprises a powder cleaning bin, a partition member, a powder collecting table system and a laser sensor; the powder cleaning bin has a cylindrical shell with an open bottom, a through hole for a powder feeding head to extend into is provided at an eccentric position of the top wall, and a laser sensor for detecting the position of the powder feeding head is provided at the through hole; the partition member is rotatably arranged in the powder cleaning bin, and when powder is fed, an annular powder passing area with the partition member rotating axis in the powder cleaning bin as the center is formed on the partition member, and the annular powder passing area is provided with a first powder passing groove, a second powder passing groove and a third powder passing groove in sequence along the circumferential direction; A circle with an arc line passing through the first powder passing groove in the middle and the center of the circle coincident with the annular powder passing area is a separation circle, the first powder passing groove includes a first part and a second part distributed on both sides of the separation circle, the width of the first powder passing groove decreases in a counterclockwise direction until a tip is formed; the second powder passing groove has the same shape as the first part and is located on the outside of the separation circle, and the third powder passing groove has the same shape as the second part and is located on the inside of the separation circle; the powder collection table system includes a powder collection ring that rotates synchronously with the partition member, and the powder collection ring is divided into three collection areas corresponding to the first powder passing groove, the second powder passing groove, and the third powder passing groove; when the powder feeding head extends from the through hole into the powder cleaning bin to feed powder, the powder flow passes through the first powder passing groove, the second powder passing groove, and the third powder passing groove in turn and falls into the corresponding collection area.

2. The measuring device for the distribution state of additive manufacturing metal powder according to claim 1, characterized in that The partition component includes a rotating cylinder rotatably assembled in the powder cleaning bin, and a cover body composed of a circular bottom plate and a surrounding plate. The first powder passing trough, the second powder passing trough and the third powder passing trough are opened on the circular bottom plate, and the edges of the first powder passing trough, the second powder passing trough and the third powder passing trough are extended upward to form a blocking plate, and a vibration module is arranged on the blocking plate.

3. The measuring device for the distribution state of additive manufacturing metal powder according to claim 2, wherein An annular space capable of covering a powder collecting ring is formed in the rotating cylinder below the cover body, the columnar shell is movably installed above the powder collecting table system through a lifting mechanism, and a powder storage tank is formed in the cover body.

4. The measuring device for the distribution state of metal powder used in additive manufacturing according to claim 3, wherein The lifting mechanism includes a screw assembly symmetrically arranged on both sides of the columnar shell, and the screw assembly includes a vertical plate, a screw, a screw block and a servo motor. The screw is rotatably assembled on the vertical plate, the screw block and the vertical plate are vertically slidably matched through a sliding pair and are transmission connected to the screw, and the screw block is fixedly connected to the side wall of the columnar shell through a connecting piece, and the servo motor is used to drive the screw to rotate.

5. The measuring device for the distribution state of additive manufacturing metal powder according to claim 3, wherein The powder collection table system also includes a base plate, a mounting tube and a rotating seat. The mounting tube is coaxially fixed to the center of the base plate. The rotating seat is driven to rotate by a servo mechanism and has an annular embedding groove on the top. The powder collection ring is detachably embedded in the annular embedding groove.

6. The additive manufacturing metal powder distribution state measuring device according to claim 5, characterized in that, The partition member is linked to the powder collection table system through a transmission mechanism, and the transmission mechanism includes a connecting shaft coaxially fixed to the bottom of the circular base plate and a plug-in shaft hole opened at the center position of the rotating seat; an outwardly protruding clamping strip is provided on the outer wall of the connecting shaft, and a limiting cylinder is provided in the plug-in shaft hole, and a guide surface is inclined at the top of the limiting cylinder, and a clamping groove adapted to the clamping strip is penetrated through the limiting cylinder at the bottom of the guide surface.

7. The measuring device for the distribution state of metal powder for additive manufacturing according to claim 5, characterized in that, A negative pressure mechanism is further provided in the powder storage tank. The negative pressure mechanism includes a suction head and a negative pressure pipe. The suction head is symmetrically arranged with the through hole and is disposed above the annular region. There are two suction ports on the suction head, and the suction ports are distributed on both sides of the annular powder passing region. One end of the negative pressure pipe is communicated with the suction head, and the other end of the negative pressure passes through the top wall of the columnar housing and is connected to an external negative pressure device.

8. The measuring device for the distribution state of metal powder for additive manufacturing according to claim 5, characterized in that The laser sensor is composed of a laser emitting end and a laser receiving end, and the laser emitting end and the laser receiving end are symmetrically arranged on both sides of the through hole.

9. The measuring device for the distribution state of metal powder used in additive manufacturing according to claim 1, characterized in that, The tips of the first powder passing groove, the second powder passing groove, and the third powder passing groove are 0.5-1 mm, the starting end width is 3-5 mm, and the surface of the groove is coated with a polytetrafluoroethylene anti-sticking coating.

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