A device for measuring the distribution state of metal powder used in additive manufacturing

Abstract

The present invention discloses a device for measuring the distribution state of metal powder for additive manufacturing, which relates to the field of measurement technology and includes a powder cleaning bin, a partition member, a powder collection platform system, and a laser sensor; the powder cleaning bin is a cylindrical shell with an open bottom, and a through hole is eccentrically opened on its top wall for the powder feeding head to extend into, 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 centered on the axis of rotation of the partition member in the powder cleaning bin is formed on the partition member. The present invention divides the inner and outer reference areas by a dividing circle, independently analyzes the performance status of different areas of the powder feeding head, and the rotating partition member and the synchronous collection ring replace the traditional instantaneous opening and closing, which is more in line with the actual continuous powder feeding working condition. At the same time, there is no need to synchronously start the negative pressure equipment to absorb powder during the powder feeding process, thereby eliminating the influence of air flow disturbance and powder residue on the measurement.

Description

Technical Field

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

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

[0003] Chinese patent publication number CN115901755B discloses a device for measuring powder distribution in powder-feed additive manufacturing. While this patent allows for measuring the distribution of additive manufacturing powder at different locations by controlling the height of the collection platform, and by superimposing measurement structures at different locations, it also provides a complete picture of powder distribution. The powder distribution measurement also reflects the degree of wear and assembly errors in the powder feeder nozzle. However, the measurement process still suffers from the following drawbacks:

[0004] 1. Conflict between powder accumulation and detection accuracy: The closed switch blades or the arc-shaped groove design of the track plate can easily lead to localized powder accumulation, requiring a complex powder cleaning system (such as a negative pressure vacuum cleaner), but this has low cleaning efficiency and increased maintenance costs.

[0005] 2. Airflow interference problem: During the measurement process, the residual powder is cleaned by the negative pressure adsorption system. Negative pressure adsorption will disrupt the airflow around the powder feeding nozzle, causing the powder flow to deviate or accumulate, affecting the powder feeding stability.

[0006] 3. Limitations of short-term powder feeding and dynamic detection: The use of instantaneous opening and closing collection (switch blade structure) has a short measurement time (<10 seconds), which makes it difficult to reflect the true distribution of continuous powder feeding.

[0007] To address the above problems, there is an urgent need to develop a powder distribution state measurement device that can achieve dynamic continuous measurement, reduce airflow interference, accurately detect, and adapt to multiple scenarios. Summary of the Invention

[0008] The object of the present invention is to provide a device for measuring the distribution state of metal powder for additive manufacturing, so as to solve the problems raised in the above background technology.

[0009] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0010] The present invention provides a device for measuring the distribution state of metal powder in additive manufacturing, comprising a powder cleaning bin, a partition member, a powder collection platform system, and a laser sensor. The powder cleaning bin has a cylindrical shell with an open bottom, and a through hole for a powder feeding head to extend into is formed eccentrically on its top wall. A laser sensor for detecting the position of the powder feeding head is provided at the through hole. The partition member is rotatably disposed within the powder cleaning bin. When powder is fed, an annular powder passing area centered on the axis of rotation of the partition member within the powder cleaning bin is formed on the partition member. The annular powder passing area is sequentially provided with a first powder passing groove, a second powder passing groove, and a third powder passing groove along the circumferential direction.

[0011] The circle with an arc line passing through the first powder passing trough in the center and the center coinciding with the annular powder passing area is the separating circle. The first powder passing trough includes a first part and a second part distributed on both sides of the separating circle, and the width of the first powder passing trough decreases counterclockwise to the tip; the second powder passing trough has the same shape as the first part and is located on the outside of the separating circle, and the third powder passing trough has the same shape as the second part and is located on the inside of the separating 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 trough, the second powder passing trough, and the third powder passing trough; 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 trough, the second powder passing trough, and the third powder passing trough in turn and falls into the corresponding collection area.

[0012] Furthermore, 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 trough, the second powder trough and the third powder trough are opened on the circular bottom plate, and the edges of the first powder trough, the second powder trough and the third powder trough all extend upward to form a blocking plate, and a vibration module is provided on the blocking plate.

[0013] Furthermore, 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 mounted above the powder collecting table system through a lifting mechanism, and a powder storage tank is formed in the cover body.

[0014] Furthermore, the lifting mechanism includes a screw assembly symmetrically arranged on both sides of the cylindrical 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, and the screw block is vertically slidably matched with the vertical plate through a sliding pair and is transmission-connected to the screw, and the screw block is fixedly connected to the side wall of the cylindrical shell through a connecting piece, and the servo motor is used to drive the screw to rotate.

[0015] Furthermore, the powder collection table system also includes a base plate, a mounting cylinder and a rotating seat. The mounting cylinder is coaxially fixed to the center of the base plate. The rotating seat is driven to rotate by a servo mechanism, and an annular embedding groove is provided on the top. The powder collection ring can be removably embedded in the annular embedding groove.

[0016] Furthermore, 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 outward-protruding card 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 card slot adapted to the card strip is opened through the limiting cylinder at the bottom end of the guide surface.

[0017] Furthermore, a negative pressure mechanism is also provided in the powder storage tank, and the negative pressure mechanism includes an air suction head and a negative pressure pipe. The air suction head is symmetrically arranged with the through hole and is arranged above the annular area, and the air suction head has two air suction ports, which are distributed on both sides of the annular powder passing area. One end of the negative pressure pipe is connected to the air suction head, and the other end of the negative pressure pipe passes through the top wall of the cylindrical shell and is connected to the external negative pressure equipment.

[0018] 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.

[0019] Furthermore, the tip of the first powder passing trough, the second powder passing trough and the third powder passing trough is 0.5-1 mm, the width of the starting end is 3-5 mm, and the surface of the trough is coated with a polytetrafluoroethylene anti-stick coating.

[0020] Compared with the existing technology, one or more of the above technical solutions have the following beneficial effects:

[0021] 1. This invention achieves dynamic, partitioned, and continuous collection of powder flow during the additive manufacturing process through the synchronous rotation control of a rotating baffle member and a powder collection ring. This overcomes the short-term error of traditional instantaneous opening and closing measurement (time <10 seconds), better fits the actual continuous powder feeding conditions, and improves detection accuracy.

[0022] 2. This invention uses a vibration module (5-10Hz) and an anti-stick coating (polytetrafluoroethylene) to replace the traditional negative pressure adsorption system, avoiding airflow disturbances that cause powder flow deviation and improving measurement stability.

[0023] 3. Based on the reference area divided by the dividing circle, the present invention independently captures the powder flow through the second powder trough (outer) and the third powder trough (inner), accurately locating wear or blockage of the powder feed head, improving detection efficiency and providing direct data support for process optimization.

[0024] 4. The detachable powder collection ring of the present invention is linked with the lifting mechanism to support rapid adaptation of different powder feeding head parameters (diameter, powder feeding amount).

[0025] In summary, the present invention solves the problems of airflow interference, short-term measurement errors and complex maintenance in traditional technologies through dynamic partitioning, synchronous transmission and structural innovation.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the top structure of the present invention;

[0030] Figure 3 yes Figure 2 AA structural diagram;

[0031] Figure 4 yes Figure 2 BB structural diagram;

[0032] Figure 5 This is a schematic structural diagram of the present invention with the top wall of the spindle housing hidden;

[0033] Figure 6 yes Figure 5 Schematic diagram of the top view structure;

[0034] Figure 7 It is a schematic diagram of the structure of the powder collection station system of the present invention;

[0035] Figure 8 Schematic diagram of the bottom structure of the partition member of the present invention;

[0036] Figure 9 yes Figure 7 Schematic diagram of the local structure at point A.

[0037] In the picture:

[0038] 1-powder cleaning bin; 11-cylindrical housing; 12-through hole; 2-partition member; 21-annular powder feeding area; 22-first powder feeding trough; 221-first part; 222-second part; 23-second powder feeding trough; 24-third powder feeding trough; 25-dividing circle; 26-rotating cylinder; 27-cover; 271-circular bottom plate; 272-enclosing plate; 273-powder storage trough; 28-blocking plate; 29-annular space; 3-powder collection platform system; 31 -powder collecting ring; 33-base plate; 34-mounting cylinder; 35-rotating seat; 36-annular embedded groove; 41-laser emitting end; 42-laser receiving end; 51-screw assembly; 52-vertical plate; 53-screw; 54-screw block; 55-servo motor; 61-connecting shaft; 62-plug-in shaft hole; 63-card strip; 64-limiting cylinder; 641-guide surface; 642-card slot; 72-suction head; 73-negative pressure tube; 74-suction port. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0040] See also Figures 1-9 The present invention provides a device for measuring the distribution state of metal powder for additive manufacturing, comprising a powder cleaning bin 1, a partition member 2, a powder collecting table system 3 and a laser sensor;

[0041] like Figure 1 and Figure 3 As shown, the powder cleaning bin 1 has a cylindrical shell 11 with an open bottom, and a through hole 12 for the powder feeding head to extend into is opened eccentrically on the top wall thereof, and 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 shown in FIG. Figure 5 and Figure 6As shown, when powder is fed, an annular powder passing area 21 is formed on the partition member 2 with the rotation axis of the partition member 2 in the powder cleaning bin 1 as the center, and the annular powder passing area 21 is provided with a first powder passing groove 22, a second powder passing groove 23 and a third powder passing groove 24 in sequence along the circumferential direction; a circle with an arc line passing through the first powder passing groove 22 in the center and the center of the circle coincident with the annular powder passing area 21 is a separating circle, and the first powder passing groove 22 includes a first part 221 and a second part 222 located on both sides of the separating circle 25, and the width of the first powder passing groove 22 decreases in 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 separating 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 separating circle 25;

[0042] like Figure 4 As shown, the powder collection table system 3 includes a powder collection ring 31 that rotates synchronously with the partition member 2, and the powder collection ring 31 is divided into three collection areas corresponding to the first powder trough 22, the second powder trough 23, and the third powder trough 24; when the powder feeding head extends from the through hole 12 into the powder cleaning bin 1 to feed powder, the powder flow passes through the first powder trough 22, the second powder trough 23, and the third powder trough 24 in turn and falls into the corresponding collection area.

[0043] Based on the above-mentioned setting, compared with the prior art in which the powder feeding head and the collecting table remain stationary and the powder is collected by opening and closing the momentary switch, and only one set of powder status data can be obtained, the present invention is when the powder feeding head extends from 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, when feeding powder, the partition member 2 and the powder collecting ring 31 rotate synchronously clockwise at a uniform speed. As the partition member 2 rotates, the powder flow ejected by the powder feeding head passes through the first powder trough 22, the second powder trough 23, the first powder trough 24, the second powder trough 25 and the second powder trough 26 in sequence. The three powder chutes 24 fall into corresponding collection areas of the powder collection ring 31 in different zones. The first powder chute 22 guides the powder flow from the entire powder feeding head to the center, which is directed downward to the corresponding collection area. The second powder chute 23 is located outside the dividing circle 25 and has the same trough shape as the outer half (first portion 221) of the first powder chute 22, capturing the powder flow outside the powder feeding head. The third powder chute 24 is located inside the dividing circle 25 and has the same trough shape as the inner half (second portion 222) of the first powder chute 22, capturing the powder flow inside the powder feeding head. The present invention collects three sets of powder status data from the collection areas corresponding to the three powder chutes (the first powder chute 22, the second powder chute 23, and the third powder chute 24). These three sets of powder status data can be compared and verified. More importantly, compared to sampling and testing powder collected over a period of time (less than 10 seconds) after instantaneous opening and closing, the use of continuous dynamic sampling is more consistent with actual continuous powder feeding conditions and can simulate the powder particle size and distribution under actual powder feeding conditions.

[0044] In addition, the morphological characteristics of the first powder trough 22, the second powder trough 23 and the third powder trough 24 specially designed in the present invention can also intuitively derive the spatial distribution state of the powder sprayed from the powder feeding head by comparing the powder in the collection areas corresponding to the second powder trough 23 and the third powder trough 24 with the powder corresponding to the first powder trough 22.

[0045] Since the powder feeding is dynamic, there is no need to start the negative pressure equipment to absorb the powder synchronously during the powder feeding process, thereby eliminating the influence of air flow disturbance and powder residue on the measurement.

[0046] like Figure 3 As 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, combined with Figure 5 As shown, the first powder trough 22, the second powder trough 23 and the third powder trough 24 are opened on the circular bottom plate 271, and the edges of the first powder trough 22, the second powder trough 23 and the third powder trough 24 are extended upward to form a blocking plate 28, and a vibration module (not shown) is provided on the blocking plate 28.

[0047] Based on the above-mentioned setting, the blocking plate 28 can form a physical barrier at the edges of the first powder trough 22, the second powder trough 23 and the third powder trough 24, limiting the powder to flow only within the trough path, and preventing cross-contamination of powder in different areas; during the powder feeding process of the powder feeding head, the vibration module can make the blocking plate 28 vibrate periodically, and shake off the residual powder through high-frequency micro-amplitude vibration (especially the accumulation in the narrow area of the tip), ensuring the unobstructed powder trough and measurement consistency.

[0048] Furthermore, the vibration module (not shown) can be started and stopped synchronously with the rotation action (for example, vibrating for 5 seconds per rotation) to avoid vibration interference with the dynamic collection process.

[0049] like Figure 3 As shown, in this embodiment, an annular space 29 capable of covering the powder collection ring 31 is formed in the rotating cylinder 26 below the cover body 27, and the cylindrical shell 11 is movably installed above the powder collection table system 3 through a lifting mechanism, and a powder storage tank 273 is formed in the cover body 27.

[0050] Based on the above-mentioned arrangement, the height between the cylindrical housing 11 and the powder collection platform system 3 can be flexibly adjusted through the lifting mechanism to realize the measurement of the distribution status of multiple groups of additive manufacturing powders at different positions; and after the powder feeding is stopped, the lifting mechanism can lift the cylindrical housing 11 to expose the powder collection ring 31 for removal and analysis. The setting of the powder storage tank 273 can temporarily store the powder that fails to directly pass through the first powder trough 22, the second powder trough 23 and the third powder trough 24 (hereinafter referred to as the powder trough), so as to avoid disordered accumulation of powder inside the cover body 27 or clogging of the powder trough entrance.

[0051] In this embodiment, the lifting mechanism includes a screw assembly 51 symmetrically arranged on both sides of the cylindrical shell 11, and the screw assembly 51 includes a vertical plate 52, a screw 53, a screw block 54 and a servo motor 55. The screw 53 is rotatably assembled on the vertical plate 52, and the screw block 54 is vertically slidably matched with the vertical plate 52 through a sliding pair and is transmission-connected to the screw 53. The screw block 54 is fixedly connected to the side wall of the cylindrical shell 11 through a connecting piece, and the servo motor 55 is used to drive the screw 53 to rotate.

[0052] Based on the above-mentioned setting, when in 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 30mm), and the servo motors 55 on both sides start synchronously after receiving the instruction, driving the screw 53 to rotate at a set speed (such as 50rpm), and the wire block 54 moves up or down along the thread pair of the screw 53, driving the powder cleaning bin 1 to rise and fall vertically through the connecting parts. The encoder (not shown) monitors the rotation angle of the screw 53 in real time, converts it into the actual height of the powder cleaning bin 1, and dynamically adjusts the speed of the servo motor 55 until it reaches the target position (accuracy ±0.05mm). After reaching the target height, the servo motor 55 enters the self-locking mode, maintains the position stability through static friction, and resists external vibration or load changes.

[0053] like Figure 3 As shown, in this embodiment, the powder collection table system 3 also includes a base plate 33, a mounting cylinder 34 and a rotating seat 35. The mounting cylinder 34 is coaxially fixed to the center of the base plate 33. The rotating seat 35 is driven to rotate by a servo mechanism, and an annular embedding groove 36 is provided on the top thereof. The powder collection ring 31 can be removably embedded in the annular embedding groove 36.

[0054] Based on the above-mentioned setting, the base plate 33 serves as an integral supporting 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 to the center of the base plate 33, and a rotating seat 35 is provided inside and driven to rotate by a servo mechanism to ensure synchronous movement with the partition member 2. An annular embedded groove 36 is provided on the top of the rotating seat 35, and a powder collection ring 31 is detachably installed inside, allowing for quick replacement of collection rings of different specifications to adapt to different powder feeding head parameters (such as diameter and powder feeding amount).

[0055] Combine Figure 3 、 Figure 4 、 Figure 7 and Figure 8As shown, in this embodiment, the partition member 2 and the powder collection table system 3 are linked through a transmission mechanism, and the transmission mechanism includes a connecting shaft 61 coaxially fixed to the bottom of the circular base plate 271 and a plug-in shaft hole 62 opened at the center position of the rotating seat 35; an outward-protruding clamping strip 63 is provided on the outer wall of the connecting shaft, and a limiting cylinder member 64 is provided in the plug-in shaft hole 62, and a guide surface 641 is inclinedly provided on the top of the limiting cylinder member 64, and a clamping groove 642 adapted to the clamping strip 63 is opened through the limiting cylinder member 64 at the bottom end of the guide surface 641.

[0056] Based on the above-mentioned setting, when in use, it is only necessary to drive the columnar shell 11 down through the inclined guide surface 641 at the top of the limiting cylinder 64, and the position of the card strip 63 and the card slot 642 can be automatically corrected to reduce hard collisions and optimize the contact trajectory. When the protruding card strip 63 on the outside of the connecting shaft 61 is embedded in the card slot 642 of the limiting cylinder 64, a rigid interlocking can be formed to ensure the coaxiality of the power transmission, thereby ensuring that the annular collecting ring can move synchronously with the partition component 2.

[0057] like Figure 4 As shown, in this embodiment, a negative pressure mechanism is also provided in the powder storage tank 273, and the negative pressure mechanism includes an air suction head 72 and a negative pressure pipe 73. The air suction head 72 is symmetrically arranged with the through hole 12 and is arranged above the annular area, and the air suction head 72 has two air suction ports 74, and the air suction ports 74 are distributed on both sides of the annular powder passing area 21. One end of the negative pressure pipe 73 is connected to the air suction head 72, and the other end of the negative pressure pipe 73 passes through the top wall of the cylindrical shell 11 and is connected to the external negative pressure equipment.

[0058] Based on the above design, after the end, the external negative pressure equipment is started, and by rotating the partition member 2, the suction head 72 can simultaneously absorb the residual powder inside and outside the powder storage tank 273 through the double suction ports 74 to avoid accumulation affecting subsequent measurements.

[0059] 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 .

[0060] In this embodiment, the tip of the first powder passing groove 22, the second powder passing groove 23, and the third powder passing groove 24 is 0.5-1 mm, the width of the starting end is 3-5 mm, and the groove surface is coated with a polytetrafluoroethylene anti-stick coating.

[0061] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for measuring the distribution state of metal powder for additive manufacturing, characterized in that: The device comprises a powder cleaning bin, a partition member, a powder collecting platform 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 opened eccentrically on 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 centered on the rotation axis of the partition member in the powder cleaning bin 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; The circle with an arc line passing through the first powder passing trough in the center and the center coinciding with the annular powder passing area is the separating circle. The first powder passing trough includes a first part and a second part distributed on both sides of the separating circle. The width of the first powder passing trough decreases in the counterclockwise direction until a tip is formed; the second powder passing trough has the same shape as the first part and is located on the outside of the separating circle, and the third powder passing trough has the same shape as the second part and is located on the inside of the separating 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 trough, the second powder passing trough, and the third powder passing trough; 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 trough, the second powder passing trough, and the third powder passing trough in turn and falls into the corresponding collection area.

2. The device for measuring the distribution state of metal powder for additive manufacturing 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 trough, the second powder trough and the third powder trough are opened on the circular bottom plate, and the edges of the first powder trough, the second powder trough and the third powder trough all extend upward to form a blocking plate, and a vibration module is provided on the blocking plate.

3. The device for measuring the distribution state of metal powder for additive manufacturing according to claim 2, characterized in that: 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 mounted above the powder collecting table system through a lifting mechanism, and a powder storage tank is formed in the cover body.

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

5. The device for measuring the distribution state of metal powder for additive manufacturing according to claim 3, characterized in that: The powder collection table system also includes a base plate, a mounting cylinder and a rotating seat. The mounting cylinder 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 its top. The powder collection ring can be removably embedded in the annular embedding groove.

6. The device for measuring the distribution state of metal powder for additive manufacturing 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 outward-protruding card 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 card slot adapted to the card strip is penetrated through the limiting cylinder at the bottom end of the guide surface.

7. The device for measuring the distribution state of metal powder for additive manufacturing according to claim 5, characterized in that: A negative pressure mechanism is also provided in the powder storage tank, and the negative pressure mechanism includes an air suction head and a negative pressure pipe. The air suction head is symmetrically arranged with the through hole and is arranged above the annular area, and the air suction head has two air suction ports, which are distributed on both sides of the annular powder passing area. One end of the negative pressure pipe is connected to the air suction head, and the other end of the negative pressure pipe passes through the top wall of the cylindrical shell and is connected to the external negative pressure equipment.

8. The device for measuring the distribution state of metal powder for additive manufacturing according to claim 5, characterized in that: The laser sensor consists 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 device for measuring the distribution state of metal powder for additive manufacturing according to claim 1, characterized in that: The tip of the first powder passing groove, the second powder passing groove and the third powder passing groove is 0.5-1 mm, the width of the starting end is 3-5 mm, and the groove surface is coated with a polytetrafluoroethylene anti-stick coating.

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