Powder roller device for metering discharged powder and 3D printer

Abstract

The invention discloses a powder rolling device for metering discharged powder and a 3D printer in the field of powder discharging of 3D printers, the powder rolling device for metering discharged powder comprises a machine shell, a powder inlet channel and a powder outlet channel are formed in the upper end and the lower end of the machine shell correspondingly, and a metering powder roller is rotationally arranged in the machine shell; the metering powder roller blocks a passage between the powder inlet channel and the powder outlet channel; the metering powder roller is connected with a driving mechanism used for driving the metering powder roller to rotate around the central axis of the metering powder roller, and a plurality of metering grooves with the same inner capacity are evenly formed in the metering powder roller in the circumferential direction around the central axis of the metering powder roller. According to the 3D printing powder discharging device, powder clamping is not prone to occurring in the powder discharging process of 3D printing, powder is saved, and powder discharging is efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of powder output of a 3D printer, and in particular to a powder rolling device and a 3D printer. Background Art

[0002] 3D metal printer is a scientific instrument used in the fields of physics, engineering and technology science, and mechanical engineering. It uses laser melting technology to melt metal powder to form functional solid parts. It is a fully digital rapid prototyping manufacturing process. It directly produces high-density metal parts based on the interface data of the three-dimensional CAD layer. The thickness of the melted metal layer ranges from 20 microns to 100 microns. When manufacturing parts, the 3D printer needs to first quantitatively put the metal powder into the powder spreading mechanism of the equipment, then spread the powder on the forming substrate, and use a scraper to evenly distribute the metal powder layer, and then melt each metal layer layer by layer in a strictly controlled air environment to finally obtain a solid part.

[0003] At present, a push plate type powder discharge mechanism is often used as the powder discharge mechanism of a 3D printer. The push plate type powder discharge mechanism drives the discharge plate to reciprocate through a motor and a lead screw. The discharge plate is provided with a discharge port. Powder flows into the discharge port. The discharge plate is driven by a motor and a lead screw to extend to the powder discharge position. The powder in the discharge port flows out to complete a single discharge.

[0004] Since the discharge plate in the push-plate type powder discharge mechanism is driven to reciprocate by the motor and the lead screw, some dust will enter the lead screw component during the reciprocating powder discharge process, causing the mechanism to get stuck; during the reciprocating motion, some powder will diffuse through the discharge plate to the opposite direction of the powder discharge port, causing powder waste; and each time the powder is discharged, the discharge plate needs to reciprocate once, resulting in poor powder discharge efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a powder roller device for measuring and discharging powder and a 3D printer which can avoid powder jamming, save powder materials and discharge powder efficiently.

[0006] In order to solve the above technical problems, in the first aspect, the powder rolling device for measuring powder provided by the present invention adopts the following technical solutions:

[0007] A powder roller device for measuring powder output comprises a casing, wherein the upper end and the lower end of the casing are respectively provided with a powder inlet channel and a powder outlet channel, a powder measuring roller is rotatably arranged inside the casing, and the powder measuring roller blocks the passage between the powder inlet channel and the powder outlet channel; the powder measuring roller is connected to a driving mechanism for driving the powder measuring roller to rotate around its central axis, and the powder measuring roller is circumferentially provided with a plurality of metering grooves with the same content around its central axis.

[0008] By adopting the above technical solution, when the 3D printer discharges powder, the metal powder first enters the casing through the powder inlet channel. Since the metering powder roller blocks the passage between the powder inlet channel and the powder outlet channel, the metal powder can only enter the metering slot facing the powder inlet channel, and then the metering powder roller is driven by the driving mechanism to rotate, so that the metering slot containing the metal powder rotates toward the powder outlet channel, so that the metal powder in the metering slot falls into the powder outlet channel to complete the powder discharge. Since the metering powder roller is provided with a plurality of metering slots in the circumference, the metering powder roller can transport the metal powder in the powder inlet channel to the powder outlet channel for powder discharge by rotating in a single direction, and the powder discharge efficiency is high. Due to the direction of movement, powder jamming is not likely to occur, and the powder discharge is smoother. Moreover, since the contents of the plurality of metering slots are the same, the powder discharge amount can be accurately controlled.

[0009] Optionally, a material guide block is fixedly arranged inside the casing, and the material guide block is provided with a material guide hole. The upper end of the material guide hole is connected to the edge of the powder inlet channel and the lower end is attached to the outer circumferential surface of the upper half of the metering powder roller.

[0010] By adopting the above technical solution, the path of the metal powder from the powder inlet channel to the metering trough is guided by the guide block, so as to reduce the possibility of the metal powder being scattered around in the casing and entering the powder outlet channel from between the outer cylindrical surface of the metering powder roller and the inner wall of the casing, so as to improve the accuracy of controlling the powder output amount; and it can reduce the possibility of metal powder accumulating and getting stuck between the outer cylindrical surface of the metering powder roller and the inner wall of the casing, thereby reducing the possibility of powder jamming.

[0011] Optionally, the guide block is made of rubber.

[0012] By adopting the above technical solution, the rubber material guide block can fit more closely with the metering powder roller and interfere less with the rotation of the metering powder roller, so as to further reduce the possibility of metal powder escaping through the gap between the guide block and the outer cylindrical surface of the metering powder roller, thereby reducing the possibility of powder jamming and leakage.

[0013] Optionally, a circular arc surface is arranged at the lower end of the material guide block, and the powder metering roller is arranged to fit the circular arc surface of the material guide block.

[0014] By adopting the above technical solution, the powder metering roller can rotate around the axis to any angle, and any metering groove outside the material guide port cannot connect the powder inlet channel and the powder outlet channel, thereby ensuring the accuracy of powder metering.

[0015] Optionally, the casing includes a first shell and a second shell that are detachably connected, the powder inlet channel is opened in the first shell, the metering powder roller and the powder outlet channel are arranged in the second shell, the inner wall of the second shell is opened with a positioning groove, the material guide block is placed in the positioning groove, and the first shell abuts against the material guide block.

[0016] By adopting the above technical solution, the casing is disassembled into a first shell and a second shell that are detachably connected, and the material guide block is clamped by the first shell and the second shell, so that the material guide block can be easily replaced after it is worn out due to long-term use; at the same time, the material guide block can also block and seal the gap between the first shell and the second shell, so as to reduce the possibility of metal powder escaping from the gap between the first shell and the second shell, thereby improving the sealing of the casing.

[0017] Optionally, a clamping portion is provided at the opening edge of the powder inlet channel, and the clamping portion is inserted into the material guide port and buckled at the opening edge of the material guide port.

[0018] By adopting the above technical solution, the clamping part can position the guide block relative to the powder feeding channel, and can also connect the powder feeding channel and the guide port, so that the metal powder can enter the guide port more smoothly from the powder feeding channel.

[0019] Optionally, a plurality of partition plates are fixedly provided on the inner wall of the powder inlet channel, and the plurality of partition plates are arranged at intervals along the long side direction of the opening surface of the powder inlet channel, and the metering trough and the powder outlet channel are provided with partition parts corresponding to the positions of the plurality of partition plates.

[0020] By adopting the above technical scheme, due to the need for the powder outlet position during 3D printing, the opening surfaces of the powder inlet channel and the powder outlet channel are usually rectangular with longer long sides. The powder inlet channel is supported along its long side by a number of partition plates, which can reduce the possibility of deformation of the powder inlet channel due to excessive span; similarly, the partition part of the metering trough and the powder outlet channel can reduce the possibility of deformation of the metering trough and the powder outlet channel due to excessive span.

[0021] Optionally, the outer circumferential surfaces at both ends of the metering powder roller are provided with powder collecting grooves, the powder collecting grooves are arranged around the central axis of the metering powder roller, and two powder collecting grooves are respectively located on both sides of all the metering grooves.

[0022] By adopting the above technical scheme, metal powder is easy to fall on the outer cylindrical surfaces at both ends of the metering powder roller during the process of entering the metering trough from the powder inlet channel. When the metal powder continues to move and escape toward the two ends of the metering powder roller, the powder collecting trough can collect the metal powder moving toward the two ends of the metering powder roller and hinder its continued movement, thereby preventing the metal powder from moving to the connection position between the metering powder roller and the driving mechanism, thereby affecting the driving process of the metering powder roller by the driving mechanism; it can also prevent the metal powder from escaping to other parts of the casing or escaping out of the casing through the penetration and rotation of the metering powder roller and the casing, thereby causing waste of metal powder and environmental pollution.

[0023] Optionally, the powder metering roller is provided with two bosses around its central axis, and the two bosses are respectively located on the sides away from the two powder collecting grooves.

[0024] By adopting the above technical solution, the two bosses can further intercept the metal powder that has not been intercepted and collected by the powder collecting groove, so as to further prevent the metal powder from continuing to move and escape toward the two ends of the metering powder roller.

[0025] Optionally, the metering powder roller is rotatably connected to the casing via a rolling bearing, and a skeleton oil seal and wool felt are arranged around the central axis of the metering powder roller, the skeleton oil seal and wool felt are located between the metering groove and the rolling bearing, and the skeleton oil seal and wool felt are both in contact with the inner wall of the casing.

[0026] By adopting the above technical solution, since the metering powder roller is rotatably connected to the housing through the rolling bearing, and the rolling bearing needs to be lubricated with lubricating oil, the skeleton oil seal can seal and isolate the lubricating oil of the rolling bearing, and the wool felt can further absorb and seal the lubricating oil, and can also prevent the metal powder from escaping to the rolling bearing, thereby ensuring the normal operation of the rolling bearing.

[0027] Optionally, a sealing strip is provided at the edge of the powder inlet of the powder inlet channel.

[0028] By adopting the above technical solution, after the powder outlet end of the 3D printer and the casing are docked and installed, there is still a gap between the powder outlet end of the 3D printer and the edge of the powder inlet of the powder inlet channel. The sealing strip can prevent metal powder from escaping from the gap, thereby reducing the waste of metal powder and pollution to the surrounding environment.

[0029] In a second aspect, the 3D printer provided by the present invention adopts the following technical solution:

[0030] A 3D printer, comprising the powder rolling device for measuring powder as described in claims 1 to 9.

[0031] In summary, the present invention includes at least one of the following beneficial technical effects:

[0032] 1. Since the metering roller is provided with several metering grooves in the circumference, the metering roller can transport the metal powder in the powder inlet channel to the powder outlet channel for powder outlet when rotating in a single direction, with high powder discharge efficiency. Due to the direction of movement, powder jamming is not likely to occur, and powder outlet is smoother. In addition, since the contents of several metering grooves are the same, the powder outlet amount can be accurately controlled.

[0033] 2. The guide block guides the path of the metal powder from the powder inlet channel to the metering trough to reduce the possibility of the metal powder being scattered around in the casing and entering the powder outlet channel from between the outer cylindrical surface of the metering powder roller and the inner wall of the casing, so as to improve the accuracy of controlling the powder output; and can reduce the possibility of metal powder accumulation and getting stuck between the outer cylindrical surface of the metering powder roller and the inner wall of the casing, thereby reducing the possibility of powder jamming;

[0034] 3. The housing is disassembled into a first shell and a second shell that are detachably connected, and the material guide block is clamped by the first shell and the second shell, so that the material guide block can be easily replaced after being worn out due to long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0036] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along line AA.

[0037] Figure 3 yes Figure 1 Schematic diagram of the local cross-sectional structure along line BB.

[0038] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of part C.

[0039] Explanation of the reference numerals: 1. Casing; 11. First shell; 111. Clamping part; 112. Fixing hole; 113. Fixing bolt; 12. Second shell; 121. Positioning groove; 2. Powder inlet channel; 21. Partition plate; 3. Powder outlet channel; 31. Partition part; 4. Measuring powder roller; 41. Measuring groove; 42. Powder collecting groove; 43. Boss; 5. Driving mechanism; 51. Driving motor; 52. Reducer; 53. Reducer mounting seat; 54. Transmission shaft; 6. Material guide block; 61. Material guide port; 7. Rolling bearing; 71. Skeleton oil seal; 72. Wool felt; 8. Sealing strip. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-4 The present invention is described in further detail.

[0041] An embodiment of the present invention discloses a 3D printer, which includes a powder roller device for measuring powder output. The powder roller device for measuring powder output is arranged between a feed end and a printing area of ​​the 3D printer, and the feed end of the powder roller device for measuring powder output is connected to the feed end of the 3D printer.

[0042] Reference Figure 1 and Figure 2The powder rolling device for measuring powder includes a casing 1, which is hollow. The casing 1 includes a first shell 11 and a second shell 12, the first shell 11 is located above the second shell 12, and the upper end surface of the second shell 12 is provided with a plurality of threaded holes. The first shell 11 is provided with two rows of fixing holes 112, one row of fixing holes 112 is a straight hole, and the inner wall of the other row of through holes is a stepped shaft with the large end at the top, and both rows of fixing holes 112 of the first shell 11 are penetrated with fixing bolts 113, and the fixing bolts 113 are simultaneously inserted into the threaded holes and threadedly connected to the second shell 12.

[0043] Reference Figure 1 and Figure 2 The first shell 11 is provided with a powder inlet channel 2, and the second shell 12 is provided with a powder outlet channel 3, and the powder inlet channel 2 and the powder outlet channel 3 are connected to each other. A powder metering roller 4 is arranged in the second shell 12, and the powder metering roller 4 blocks the passage between the powder inlet channel 2 and the powder outlet channel 3.

[0044] Reference Figure 1 After the feed end of the 3D printer and the housing 1 are docked and installed, the powder feed channel 2 is connected to the feed end of the 3D printer, but there is still a gap between the feed end of the 3D printer and the edge of the powder inlet of the powder feed channel 2. A sealing strip 8 is provided at the edge of the powder inlet of the powder feed channel 2, and the sealing strip 8 is arranged around the powder inlet. The sealing strip 8 can prevent metal powder from escaping from the gap, reducing the waste of metal powder and the pollution to the surrounding environment.

[0045] Reference Figure 1 In order to facilitate docking and fixing with the feed end of the 3D printer, the upper end surface of the first shell 11 is inclined, and the first shell 11 is provided with a plurality of through holes, and bolts are passed through the plurality of through holes for connection with the powder outlet of the 3D printer. The first shell 11 is also provided with a plurality of screw holes for inserting and threading the bolts of the powder outlet of the 3D printer, and a circle of sealing strips 8 are also provided around the plurality of screw holes.

[0046] Reference Figure 1 and Figure 3 , rolling bearings 7 are arranged at both ends of the metering powder roller 4, and the metering powder roller 4 is stably connected to the second housing 12 through the rolling bearings 7. One end of the metering powder roller 4 is penetrated and rotated on the shell wall of the second housing 12, and the end of the metering powder roller 4 located outside the second housing 12 is connected to the driving mechanism 5 through a coupling 53, and the driving structure includes a driving motor 51, a reducer 52 and a reducer mounting seat 53 connected in sequence, and a coupling is arranged in the reducer mounting seat 53, and the driving end of the reducer 52 is connected to the power input end of the coupling, and the power output end of the coupling is fixedly connected to a transmission shaft 54, and the metering powder roller 4 is fixedly connected to the transmission shaft 4 to drive the metering powder roller 4 to rotate smoothly.

[0047] Reference Figure 2 and Figure 3 The outer circumferential surface of the metering powder roller 4 is provided with a plurality of metering grooves 41, the plurality of metering grooves 41 are uniformly distributed circumferentially around the central axis of the metering powder roller 4, the plurality of metering grooves 41 are extended along the axis of the metering powder roller 4, and the contents of the plurality of metering grooves 41 are the same.

[0048] When the feed end of the 3D printer discharges powder, the metal powder first enters the housing 1 through the powder feed channel 2. Since the metering powder roller 4 blocks the passage between the powder feed channel 2 and the powder outlet channel 3, the metal powder can only enter the metering slot 41 facing the powder feed channel 2. Then the driving mechanism 5 drives the metering powder roller 4 to rotate, so that the metering slot 41 containing the metal powder rotates toward the powder outlet channel 3, so that the metal powder in the metering slot 41 falls into the powder outlet channel 3 to complete the powder discharge. Since the metering powder roller 4 is provided with a plurality of metering slots 41 in the circumference, the metering powder roller 4 can transport the metal powder in the powder feed channel 2 to the powder outlet channel 3 for powder discharge by rotating in a single direction, and the powder discharge efficiency is high. Due to the direction of movement, powder jamming is not likely to occur, and the powder discharge is smoother. Moreover, since the contents of the plurality of metering slots 41 are the same, the powder discharge amount can be accurately controlled.

[0049] Reference Figure 2 and Figure 3 A guide block 6 is provided between the first shell 11 and the second shell 12, and the guide block 6 is made of rubber material. A positioning groove 121 is provided on the inner wall of the second shell 12, and the guide block 6 is placed in the positioning groove 121, and the first shell 11 is in contact with the upper end surface of the guide block 6. The guide block 6 is provided with a guide hole, and the upper end of the guide port 61 is connected to the edge of the powder feed channel 2, and the lower end of the guide port 61 is attached to the outer circumferential surface of the upper half of the metering powder roller 4. A clamping part 111 is provided on the opening edge of the powder feed channel 2, and the clamping part 111 is inserted into the guide port 61 and buckled on the opening edge of the guide port 61. The clamping part 111 can position the guide block relative to the powder feed channel 2, and can also connect the powder feed channel 2 and the guide port 61, so that the metal powder can enter the guide port 61 from the powder feed channel 2 more smoothly.

[0050] The guide block 6 guides the path of the metal powder from the powder inlet channel 2 to the metering groove 41 to reduce the possibility of the metal powder being scattered around in the casing 1 and entering the powder outlet channel 3 from the outer cylindrical surface of the metering powder roller 4 and the inner wall of the casing 1, so as to improve the accuracy of controlling the amount of powder output; and can reduce the possibility of metal powder accumulation and getting stuck between the outer cylindrical surface of the metering powder roller 4 and the inner wall of the casing 1, thereby reducing the possibility of powder jamming. The guide block 6 made of rubber material can fit more closely with the metering powder roller 4, and at the same time, it has less interference with the rotation of the metering powder roller 4, so as to further reduce the possibility of metal powder escaping through the gap between the guide block 6 and the outer cylindrical surface of the metering powder roller 4, thereby reducing the possibility of powder jamming and leakage.

[0051] The first shell 11 and the second shell 12 fixed by bolts clamp the guide block 6 so that after the guide block 6 is worn out due to long-term use, the first shell 11 and the second shell 12 can be disassembled to facilitate the replacement of the guide block 6; at the same time, the guide block 6 can also block and plug the gap between the first shell 11 and the second shell 12 to reduce the possibility of metal powder escaping from the gap between the first shell 11 and the second shell 12, thereby improving the sealing of the casing 1.

[0052] Reference Figure 1 and Figure 3 Due to the need for the powder outlet position during 3D printing, the opening surfaces of the powder inlet channel 2 and the powder outlet channel 3 are usually rectangular with longer long sides. In order to reduce the possibility of deformation of the powder inlet channel 2 and the powder outlet channel 3 due to the longer span, the inner wall of the powder inlet channel 2 is fixedly provided with a plurality of partition plates 21. The plurality of partition plates 21 are arranged at equal intervals along the long side direction of the opening surface of the powder inlet channel 2. The plurality of partition plates 21 are perpendicular to the long side edges of the powder inlet channel 2. The plurality of partition plates 21 divide the powder inlet channel 2 into a plurality of independent spaces. The metering trough 41 and the powder outlet channel 3 are both fixedly provided with partitions 31 corresponding to the positions of the plurality of partition plates 21. The number of partition plates 21 and the partitions 31 can be appropriately reduced or increased with the change in the length of the metering powder roller.

[0053] The powder inlet channel 2 is supported along its long side by a plurality of partition plates 21, which can reduce the possibility of deformation of the powder inlet channel 2 due to excessive span and enhance the strength of the parts; similarly, the partition part 31 of the metering trough 41 and the powder outlet channel 3 can reduce the possibility of deformation of the metering trough 41 and the powder outlet channel 3 due to excessive span.

[0054] When the metal powder enters the metering groove 41 from the powder inlet channel 2, it is easy to fall on the outer cylindrical surface at both ends of the metering powder roller 4, and there is a possibility that the metal powder continues to move and escape toward the two ends of the metering powder roller 4. When the metal powder continues to move and escape toward the two ends of the metering powder roller 4, it will affect the normal operation of the rolling bearing 7, and will escape from the casing 1 through the penetration and rotation of the metering powder roller 4 and the casing 1, thereby causing waste of metal powder and environmental pollution. In addition, since the metering powder roller 4 is rotatably connected to the casing 1 through the rolling bearing 7, the rolling bearing 7 needs to be lubricated with lubricating oil. Figure 3 and Figure 4 A skeleton oil seal 71 and a wool felt 72 are fixedly arranged at both ends of the metering powder roller 4 around its central axis. The wool felt 72 is located between the metering groove 41 and the rolling bearing 7. The skeleton oil seal 71 is located between the wool felt 72 and the rolling bearing 7. The skeleton oil seal 71 and the wool felt 72 are both in contact with the inner wall of the casing 1.

[0055] The skeleton oil seal 71 can seal and isolate the lubricating oil of the rolling bearing 7 , and the wool felt 72 can further absorb and seal the lubricating oil while preventing metal powder from escaping to the rolling bearing 7 , thereby ensuring the normal operation of the rolling bearing 7 .

[0056] Reference Figure 3 and Figure 4 Since the wool felt 72 has a limited blocking effect on metal powder, two powder collecting grooves 42 are respectively provided at both ends of the metering powder roller 4. The two powder collecting grooves 42 are arranged around the central axis of the metering powder roller 4, and the two powder collecting grooves 42 are respectively located on both sides of all metering grooves 41. Two bosses 43 are fixedly connected to the outer cylindrical surface of the metering powder roller 4. The two bosses 43 are arranged around the central axis of the metering powder roller 4. The two bosses 43 are both located at the two ends of the metering powder roller 4. The two bosses 43 are respectively located on the side away from the two powder collecting grooves 42, and the two bosses 43 are respectively close to the wool felt 72 at the two ends of the metering powder roller 4.

[0057] When the metal powder continues to move and escape toward the two ends of the metering powder roller 4, the powder collecting groove 42 can collect the metal powder moving toward the two ends of the metering powder roller 4 and prevent it from continuing to move. The two bosses 43 can further intercept the metal powder that is not intercepted and collected by the powder collecting groove 42, so as to further prevent the metal powder from continuing to move and escape toward the two ends of the metering powder roller 4, so as to further prevent the metal powder from escaping to the rolling bearing 7, and prevent the metal powder from escaping out of the casing 1 through the rotation point where the metering powder roller 4 and the casing 1 are penetrated.

[0058] The implementation principle of a powder roller device and a 3D printer for measuring powder output according to an embodiment of the present invention is as follows: when the feed end of the 3D printer discharges powder, the metal powder first enters the housing 1 through the powder feed channel 2. Since the metering powder roller 4 blocks the passage between the powder feed channel 2 and the powder outlet channel 3, the metal powder can only enter the metering groove 41 facing the powder feed channel 2, and then the driving mechanism 5 drives the metering powder roller 4 to rotate, so that the metering groove 41 containing the metal powder rotates toward the powder outlet channel 3, so that the metal powder in the metering groove 41 falls into the powder outlet channel 3 to complete the powder output. Since the metering powder roller 4 is provided with a plurality of metering grooves 41 in the circumference, the metering powder roller 4 can transport the metal powder in the powder feed channel 2 to the powder outlet channel 3 for powder output by rotating in a single direction, and the powder discharge efficiency is high, and due to the direction of movement, powder jamming is not likely to occur, and the powder output is smoother; and since the content of the plurality of metering grooves 41 is the same, the powder output can be accurately controlled.

[0059] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A powder rolling device for measuring powder, characterized in that: The invention comprises a casing (1), wherein the upper end and the lower end of the casing (1) are respectively provided with a powder inlet channel (2) and a powder outlet channel (3); a powder metering roller (4) is rotatably arranged inside the casing (1), and the powder metering roller (4) blocks the passage between the powder inlet channel (2) and the powder outlet channel (3); the powder metering roller (4) is connected to a driving mechanism (5) for driving the powder metering roller (4) to rotate around its central axis; and the powder metering roller (4) is circumferentially provided with a plurality of metering grooves (41) with the same content around its central axis.

2. A powder rolling device for measuring powder according to claim 1, characterized in that: A material guide block (6) is fixedly arranged inside the casing (1), and a material guide hole is opened in the material guide block (6). The upper end of the material guide opening (61) is connected to the edge of the powder feeding channel (2) and the lower end is in contact with the outer circumferential surface of the upper half of the powder metering roller (4).

3. A powder rolling device for measuring powder according to claim 2, characterized in that: The material guide block (6) is made of rubber.

4. A powder rolling device for measuring powder according to claim 2, characterized in that: The lower end of the material guide block (6) is provided with an arc surface, and the powder metering roller (4) is arranged to fit the arc surface of the material guide block (6).

5. A powder rolling device for measuring powder according to claim 2, characterized in that: The casing (1) comprises a first shell (11) and a second shell (12) which are detachably connected, the powder inlet channel (2) is provided in the first shell (11), the powder metering roller (4) and the powder outlet channel (3) are arranged in the second shell (12), a positioning groove (121) is provided on the inner wall of the second shell (12), the material guide block (6) is placed in the positioning groove (121), and the first shell (11) abuts against the material guide block (6).

6. A powder rolling device for measuring powder according to claim 1, characterized in that: A plurality of partition plates (21) are fixedly arranged in the powder inlet channel (2), and the plurality of partition plates (21) are arranged at intervals along the long side direction of the opening surface of the powder inlet channel (2), and the metering groove (41) and the powder outlet channel (3) are both provided with partition portions (31) at positions corresponding to the plurality of partition plates (21).

7. A powder rolling device for measuring powder according to claim 1, characterized in that: The outer circumferential surfaces at both ends of the metering powder roller (4) are provided with powder collecting grooves (42), the powder collecting grooves (42) are arranged around the central axis of the metering powder roller (4), and the two powder collecting grooves (42) are respectively located on both sides of all the metering grooves (41).

8. A powder rolling device for measuring powder according to claim 7, characterized in that: The powder metering roller (4) is provided with two bosses (43) around its central axis, and the two bosses (43) are respectively located on the sides away from the two powder collecting grooves (42).

9. A powder rolling device for measuring powder according to claim 1, characterized in that: The metering powder roller (4) is rotatably connected to the casing (1) via a rolling bearing (7); a skeleton oil seal (71) and a wool felt (72) are arranged around the central axis of the metering powder roller (4); the skeleton oil seal (71) and the wool felt (72) are located between the metering groove (41) and the rolling bearing (7); and the skeleton oil seal (71) and the wool felt (72) are both in contact with the inner wall of the casing (1).

10. A 3D printer, characterized in that: A powder rolling device for measuring powder according to any one of claims 1 to 9.

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