CN209754013U - Powder spreading device - Google Patents
Powder spreading device Download PDFInfo
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- CN209754013U CN209754013U CN201822198131.1U CN201822198131U CN209754013U CN 209754013 U CN209754013 U CN 209754013U CN 201822198131 U CN201822198131 U CN 201822198131U CN 209754013 U CN209754013 U CN 209754013U
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Abstract
The utility model provides a spread powder device relates to the three-dimensional printing equipment field, and this spread powder device includes: the scraper is positioned between the knife rest and the powder spreading surface. The scraper includes connecting portion and scrapes whitewashed portion, scrapes whitewashed portion including scraping whitewashed face and pressure powder face. One end of the connecting part is connected with the tool rest, the other end of the connecting part is connected with one end of the powder scraping surface, and the other end of the powder scraping surface is connected with the powder pressing surface. The powder scraping surface is an arc surface, the powder pressing surface is a plane, and the powder pressing surface is parallel to the powder spreading surface. The problem of current shop powder device can't be scraping the powder while with the powder compaction, print inefficiency can be solved.
Description
Technical Field
the utility model relates to a three-dimensional printing equipment field especially relates to a spread powder device.
Background
The powder spreading type three-dimensional printer is suitable for manufacturing various non-standard parts due to high processing precision and flexible processing shape, wherein the powder spreading device is an important part of the powder spreading type printer and is used for pushing metal powder to a powder spreading surface, and the printing precision is greatly influenced.
the powder tiling of current shop's powder device passes through the scraper on spreading the powder face, and current shop's powder device ubiquitous can't be when spreading the powder with the powder compaction, prints the inefficiency scheduling problem.
SUMMERY OF THE UTILITY MODEL
the utility model provides a spread powder device can solve current shop's powder device and can't be when scraping the powder with the powder compaction, print the problem of inefficiency.
An embodiment of the utility model provides a spread powder device, include: the scraper is positioned between the cutter frame and the powder spreading surface;
The scraper comprises a connecting part and a powder scraping part, and the powder scraping part comprises a powder scraping surface and a powder pressing surface;
One end of the connecting part is connected with the tool rest, the other end of the connecting part is connected with one end of the powder scraping surface, and the other end of the powder scraping surface is connected with the powder pressing surface;
The powder scraping surface is an arc surface, the powder pressing surface is a plane, and the powder pressing surface is parallel to the powder spreading surface.
In this embodiment, when the powder is spread, the powder-scraping surface pushes the powder, and component forces in two directions are generated in the pushing process, wherein the component force in one direction is parallel to the powder-spreading surface to spread the powder on the powder-spreading surface, and the component force in the other direction is perpendicular to the powder-spreading surface and points to the powder-spreading surface to guide the powder to the powder-pressing surface.
drawings
in order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
fig. 1 is a schematic structural view of a powder spreading device according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a powder spreading device according to a second embodiment of the present invention;
Fig. 3 is an assembly diagram of a first view angle of a knife rest and a scraper in a powder spreading device according to a second embodiment of the present invention;
Fig. 4 is an assembly diagram of a second view angle of the knife rest and the scraper in the powder spreading device provided by the second embodiment of the invention;
Fig. 5 is an assembly diagram of a third view angle of a knife rest and a scraper in a powder spreading device provided by a second embodiment of the invention;
Fig. 6 is an assembly schematic view of a clamp main body and a scraper seat in a powder spreading device according to a second embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a scraper in a powder spreading device according to a third embodiment of the present invention;
fig. 8 is a side view schematically illustrating a structure of a scraper in a powder spreading device according to a third embodiment of the present invention;
Fig. 9 is a schematic structural diagram of a scraper in a powder spreading device according to a fourth embodiment of the present invention;
fig. 10 is a side view schematically illustrating a structure of a scraper in a powder spreading device according to a fourth embodiment of the present invention;
fig. 11 is a schematic structural diagram of a scraper in a powder spreading device according to a fifth embodiment of the present invention;
Fig. 12 is a side view of a schematic structural diagram of a scraper in a powder spreading device according to a fifth embodiment of the present invention.
Detailed Description
In order to make the utility model aim at, characteristic, advantage can be more obvious and understandable, will combine the attached drawing that the embodiment of the utility model provides below, to the technical scheme that the embodiment of the utility model provides clearly, describe completely, obviously, the embodiment that describes is only a part of embodiments of the utility model, and not all embodiments. Based on the embodiments provided by the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a powder spreading device according to a first embodiment of the present invention, as shown in fig. 1, the powder spreading device includes: the scraper 100 and the cutter holder 200, the scraper 100 is installed on the cutter holder 200, when powder is to be spread, the scraper 100 faces the powder spreading surface 300, and the scraper 100 is located between the cutter holder 200 and the powder spreading surface 300.
The scraper 100 includes a connecting portion 110 and a powder scraping portion 120, wherein the powder scraping portion 120 includes a powder scraping surface 121 and a powder pressing surface 122.
One end of the connecting part 110 is connected with the tool holder 200, the other end of the connecting part 110 is connected with one end of the powder scraping surface 121, and the other end of the powder scraping surface 121 is connected with the powder pressing surface 122.
The powder scraping surface 121 is a circular arc surface, the powder pressing surface 122 is a plane, and the powder pressing surface 122 is parallel to the powder spreading surface 300.
In this embodiment, the scraper includes a powder scraping surface and a powder pressing surface, the powder scraping surface is an arc surface, the powder pressing surface is a plane, when powder is spread, the powder scraping surface pushes powder, component forces in two directions are generated in the pushing process, the component force in one direction is parallel to the powder spreading surface, the powder is flatly spread on the powder spreading surface, the component force in the other direction is perpendicular to the powder spreading surface and points to the powder spreading surface, the powder is guided to the powder pressing surface, and the powder is compacted by the powder pressing surface after the powder is guided to the powder pressing surface, so the scraper can compact the powder while spreading the powder, and the printing efficiency is improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a powder spreading device according to a second embodiment of the present invention, and the powder spreading device in this embodiment is different from the powder spreading device shown in fig. 1 in that:
further, the tool holder 200 includes a clamp body 210 and two pressure plates 220.
The connecting portion 110 includes a first portion 111 and a second portion 112, and the pressing plate 220 is detachably fixed to the jig main body 210 and sandwiches the first portion 111 between the two pressing plates 220 and the jig main body 210.
The second portion 112 passes through a gap between the two pressing plates 220, one end of the second portion 112 is connected with the first portion 111, and the other end of the second portion 112 is connected with the powder scraping portion 120.
Further, please refer to fig. 3 to 5, fig. 3 is an assembly diagram of a first viewing angle of a knife rest and a scraper in a powder spreading device provided by a second embodiment of the present invention, fig. 4 is an assembly diagram of a second viewing angle of a knife rest and a scraper in a powder spreading device provided by a second embodiment of the present invention, fig. 5 is an assembly diagram of a third viewing angle of a knife rest and a scraper in a powder spreading device provided by a second embodiment of the present invention, with reference to fig. 3 to 5, a connecting portion 110 includes a first portion 111 and a second portion 112, the first portion 111 includes a first plane 111A and a second plane 111B which are opposite, and the first plane 111A is parallel to the powder pressing surface 122.
The first portion 111 further includes a third plane 111C and a fourth plane 111D opposite to each other, the third plane 111C and the fourth plane 111D connect the first plane 111A and the second plane 111B, and the third plane 111C and the fourth plane 111D are at the same angle with the first plane 111A and are both at a non-obtuse angle.
the clamp body 210 comprises a scraper mounting surface 211, the scraper mounting surface 211 faces the powder spreading surface 300 in fig. 1, a mounting groove 212 is formed in the scraper mounting surface 211, the mounting groove 212 comprises a first limiting surface 212A, a second limiting surface 212B and a third limiting surface 212C, the first limiting surface 212A is attached to the first plane 111A, the second limiting surface 212B is attached to the third plane 111C, and the third limiting surface 212C is attached to the fourth plane 111D.
The second portion 112 comprises a fifth plane 112A and a sixth plane 112B, the fifth plane 112A and the sixth plane 112B are perpendicular to the second plane 111B, one end of the fifth plane 112A and one end of the sixth plane 112B are connected with the second plane 111B, the number of the pressing plates 220 is two, the fifth plane 112A and the sixth plane 112B penetrate through a gap between the two pressing plates 220, and the other end of the fifth plane 112A and the other end of the sixth plane 112B are connected with one end of the powder scraping surface 121.
The pressing plates 220 comprise fourth limiting surfaces 221, fifth limiting surfaces 222 and sixth limiting surfaces 223, the fifth limiting surfaces 222 are connected with the fourth limiting surfaces 221 and the sixth limiting surfaces 223, the fourth limiting surfaces 221 of the two pressing plates 220 are respectively attached to the third plane 111C and the fourth plane 111D, the fifth limiting surfaces 222 of the two pressing plates 220 are respectively attached to the second plane 111B, and the sixth limiting surfaces 223 of the two pressing plates 220 are respectively attached to the fifth plane 112A and the sixth plane 112B.
Further, with reference to fig. 2 to 5, the powder laying device further includes a connecting bolt 400.
The platen 220 also includes opposing first and second mounting surfaces 224, 225, the first and second mounting surfaces 224, 225 each being parallel to the doctor mounting surface 211, the second mounting surface 225 being flush with the doctor mounting surface 211.
The pressure plate 220 is further provided with a first mounting hole 226, the first mounting hole 226 penetrates through the first mounting surface 224 and the second mounting surface 225, and an axis of the first mounting hole 226 is perpendicular to the first mounting surface 224.
the doctor mounting surface 211 is provided with second mounting holes 213, the first mounting holes 226 are coaxial with the second mounting holes 213, and the connection bolts 400 pass through the first mounting holes 226 and the second mounting holes 213 to fix the doctor 100 between the jig main body 210 and the pressing plate 220.
For convenience of description, the longitudinal direction of the doctor blade 100 is referred to as a first direction, a direction perpendicular to the first direction and parallel to the powder application surface 300 is referred to as a second direction, and a direction perpendicular to the powder application surface 300 is referred to as a third direction.
Optionally, the second mounting hole 213 may be a through hole or a blind hole, when the second mounting hole 213 is a blind hole, the second mounting hole 213 is a threaded hole, when the second mounting hole 213 is a through hole, the second mounting hole 213 may be a threaded hole or a unthreaded hole, and when the second mounting hole 213 is a unthreaded hole, the powder spreading device further includes a coupling nut (not shown in the figure).
When the second mounting hole 213 is a screw hole, the connection bolt 400 passes through the first mounting hole 226 and into the second mounting hole 213 to clamp the scraper 100 between the pressing plate 220 and the jig main body 210. When the second mounting hole 213 is a smooth hole, the connection bolt 400 passes through the first mounting hole 226 and the second mounting hole 213 in sequence, and the connection nut is screwed on the portion of the connection bolt 400 passing through the second mounting hole 213, so as to fix the scraper 100 in the mounting groove 212 through the pressing plate 220 and the mounting groove 212.
After the connecting bolt 400 is screwed or the connecting nut is screwed, the second plane 111C is attached to the second limiting surface 212B and the fourth limiting surface 221 of one of the pressing plates 220, the fourth limiting surface 111D is attached to the third limiting surface 212C and the fourth limiting surface 221 of the other pressing plate 220, meanwhile, the fifth plane 112A and the sixth plane 112B are respectively attached to the sixth limiting surfaces 223 of the two pressing plates 220, and the displacement of the scraper 100 in the second direction is constrained by the second limiting surface 212B, the third limiting surface 212C, the fourth limiting surfaces 221 of the two pressing plates 220 and the sixth limiting surfaces 223 of the two pressing plates 220.
Meanwhile, after the connecting bolt 400 is tightened, the fifth limiting surfaces 222 of the two pressing plates 220 press the second plane 111B and press the first plane 111A against the first limiting surface 212A, the displacement of the scraper 100 in the third direction is constrained by the first limiting surfaces 212A and the fifth limiting surfaces 222 of the two pressing plates 220, and the displacement of the scraper 100 in the first direction is constrained by the friction between the second plane 111B and the fifth limiting surfaces 222 of the two pressing plates 220 and the friction between the first plane 111A and the first limiting surfaces 212A.
In summary, after the pressing plate 220 is connected with the clamp body 210 through the connecting bolt 400, the scraper 100 is clamped between the pressing plate 220 and the clamp body 210, and the displacement of the scraper 100 in three directions is restricted, meanwhile, the pressing plate 220 and the clamp body 210 can be conveniently detached due to the threaded connection between the pressing plate 220 and the clamp body 210, so that the scraper 100 is detached, and the replacement of the scraper 100 is convenient.
In practical application, since the powder pressing surface 122 is a plane, after the powder pressing surface 122 is worn, the powder pressing surface 122 can be subjected to secondary processing, and the worn powder pressing surface 122 is removed by cutting processing to obtain a new powder pressing surface 122, so that the scraper 100 can be recycled for many times, and the economy of the powder spreading device is improved.
Optionally, a counter-bore 227 is further disposed on the first mounting surface 224, and the counter-bore 227 is coaxial with the first mounting hole 226.
In practical application, only the surface of the countersunk 227 is in contact with the end face of the nut of the connecting bolt 400, and only the surface of the countersunk 227 is a matching surface, so that high requirements are only required on the dimensional tolerance, form and position tolerance and surface roughness of the countersunk 227 during processing, the whole first mounting surface 224 does not need to be subjected to finish machining, and the cost for processing the powder laying device is reduced.
further, please refer to fig. 6, fig. 6 is an assembly schematic diagram of the clamp main body and the scraper seat in the powder spreading device according to the second embodiment of the present invention, and with reference to fig. 2 to 6, the powder spreading device further includes a scraper seat 500 and a fixing bolt 600.
The holder body 210 also includes a doctor blade mounting surface 214.
The holder attachment surface 214 is perpendicular to the holder attachment surface 211, and a long hole 215 is provided in the holder attachment surface 214, and the long hole 215 has a longitudinal direction perpendicular to the holder attachment surface 211.
The doctor blade holder 500 is provided with a clamp mounting hole 510, and a fixing bolt 600 passes through the long hole 215 and the clamp mounting hole 510 to detachably fix the clamp main body 210 to the doctor blade holder 500.
Further, the jig main body 210 includes a blade holder connection portion 216 and a blade connection portion 217.
The blade holder coupling portion 216 includes a blade holder mounting surface 214, the blade coupling portion 217 includes a blade mounting surface 211, and the blade coupling portion 217 is coupled to the blade holder mounting surface 214.
The blade attachment portion 217 and the blade holder 500 are located on either side of the blade holder attachment portion 216, respectively, in a direction perpendicular to the blade holder mounting surface 214.
Optionally, the clamp mounting hole 510 may be a smooth hole or a threaded hole, when the clamp mounting hole 510 is a threaded hole, the fixing bolt 600 is inserted through the elongated hole 215 and screwed into the clamp mounting hole 510, and after the fixing bolt 600 is tightened, the clamp body 210 is fixed to the scraper seat 500.
When the clamp mounting hole 510 is a smooth hole, the powder spreading device further includes a fixing bolt (not shown), the fixing bolt 600 is inserted through the long hole 215 and the clamp mounting hole 510 in sequence, and the fixing nut is screwed to a portion of the fixing bolt 600 inserted through the clamp mounting hole 510, and after the fixing nut is screwed, the clamp main body 210 is fixed to the scraper base 500.
In practical applications, before tightening the fixing bolt 600 or tightening the fixing nut, the fixing bolt 600 is slid in the long hole 215 along the length direction of the long hole 215, and the distance between the scraper 100 and the powder spreading surface 300 in fig. 1 is adjusted. When the distance between the scraper 100 and the powder spreading surface 300 in fig. 1 is equal to the target distance, the fixing bolt 600 or the fixing nut is tightened to fix the clamp body 210 to the scraper seat 500 and maintain the distance between the scraper 100 and the powder spreading surface 300 at the target distance. Since the doctor blade holder 500 and the doctor blade connecting portion 217 are respectively located on both sides of the doctor blade holder connecting portion 216 in the direction perpendicular to the doctor blade holder mounting surface 214, it can be ensured that the doctor blade holder 500 does not interfere with the movement of the doctor blade connecting portion 217 when the distance between the doctor blade 100 and the powder spreading surface 300 is adjusted.
In this embodiment, in the first aspect, when the powder is spread, the powder-scraping surface pushes the powder, and component forces in two directions are generated in the pushing process, where the component force in one direction is parallel to the powder-spreading surface to spread the powder on the powder-spreading surface, and the component force in the other direction is perpendicular to the powder-spreading surface and directed to the powder-spreading surface to guide the powder to the powder-pressing surface, and since the powder-pressing surface is a plane parallel to the powder-spreading surface, the powder is guided to the powder-pressing surface and then the powder-pressing surface compacts the powder, the powder can be compacted by the scraper while the powder is spread, and the printing efficiency is improved. In the second aspect, since the doctor blade is held between the jig main body and the pressing plate, and the pressing plate is connected to the jig main body by the screw connection, the doctor blade can be easily detached or replaced. The third aspect, owing to be provided with the scraper mounting groove, and be connected the back at clamp plate and anchor clamps main part, each surface of the connecting portion of scraper and each spacing face laminating of scraper mounting groove support the displacement of restraint scraper through the rigidity, so the installation of scraper is more reliable. In the fourth aspect, since the clamp main body is connected with the scraper base by the screw thread connection, the clamp main body can be conveniently mounted on the scraper base or be conveniently dismounted from the scraper base. In the fifth aspect, since the long hole is provided in the jig main body, the mounting bolt is moved in the long hole in the longitudinal direction of the long hole, and the distance between the scraper and the powder spreading surface can be adjusted. In the sixth aspect, since the scraper holder and the scraper connecting portion are respectively located on both sides of the scraper seat connecting portion in the direction perpendicular to the scraper mounting surface, it can be ensured that the scraper seat does not interfere with the scraper connecting portion in movement when the distance between the scraper and the powder spreading surface is adjusted.
Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a scraper in a powder spreading device according to a third embodiment of the present invention, fig. 8 is a side view of the schematic structural diagram of the scraper in the powder spreading device according to the third embodiment of the present invention, and in combination with fig. 7 and 8, unlike the powder spreading device shown in fig. 1 to 6, in this embodiment:
Further, in the vertical cross section, the powder scraping surface 121A is a convex arc, and the powder scraping surface 121A is tangent to the powder pressing surface 122.
The vertical cross-section is perpendicular to the dusting surface 300 and is normal to the length of the scraper 100.
For convenience of explanation, in each of the following embodiments, on a vertical cross section, a plane coordinate system is established with a midpoint of the powder scraping surface 122 as a left origin, a direction parallel to the powder spreading surface 300 as an X axis, a direction perpendicular to the powder spreading surface 300 as a Y axis, a moving direction of the scraper 100 in the vertical cross section as a positive X axis direction, and a direction away from the powder spreading surface 300 as a positive Y axis direction.
The convex arc of the powder scraping surface 121A means that the second derivative of the curve equation of the arc of the powder scraping surface 121A is a negative value in the plane coordinate system.
In practical applications, the force applied to the powder by the powder scraping surface 121A may be orthogonally decomposed into a first force in a positive direction along the X-axis and a second force in a negative direction along the Y-axis. The first force pushes the powder in the direction of movement of the scraper 100 and the second force pushes the powder towards the powder pressing surface 122.
because scrape whitewashed face 121A and be protruding circular arc, along with the powder is pressed gradually to pressing whitewashed face 122, scrape whitewashed face 121A and reduce gradually the contained angle between effort and the X axle of powder, this first effort reduces gradually, this second effort crescent, until this powder with press whitewashed face 122 contact, first effort disappears, the second effort reaches the biggest, scrape whitewashed face 121A and gently pass through to the effort of powder and the effort of pressing whitewashed face 122 to the powder, there is not the sudden change in size and direction for two efforts, so can prevent because the phenomenon of the bullet powder that the vibration that the effort sudden change caused and raise the powder.
Further, the scraper 100 is made of a flexible material, which may be, for example, nitrile rubber, silicone rubber, natural rubber, or the like.
In practical application, if the surface of the printed element has a warping structure or splashes fall on the surface of the printed element, a rigid scraper can generate a cutter clamping phenomenon or scrape the surface of a part, while the scraper 100 in the embodiment is made of a flexible material, so that rigid collision cannot be generated between the scraper and the part, vibration between the scraper and powder can be buffered and absorbed, the condition that the cutter is clamped or the surface of the part is scratched when powder is spread is prevented, and the phenomena of powder bouncing and powder lifting during powder spreading can be prevented.
A fillet 111E is provided between the first plane 111A and the third plane 111C, a fillet 111E is provided between the first plane 111A and the fourth plane 111D, a fillet 111E is provided between the second plane 111B and the third plane 111C, and a fillet 111E is provided between the second plane 111B and the fourth plane 111D
It should be noted that, since the rounded corners 111E are provided, stress concentration at the intersection lines of the two surfaces is prevented, and the service life of the blade 100 is prolonged.
in this embodiment, in the first aspect, when the powder is spread, the powder-scraping surface pushes the powder, and component forces in two directions are generated in the pushing process, where the component force in one direction is parallel to the powder-spreading surface to spread the powder on the powder-spreading surface, and the component force in the other direction is perpendicular to the powder-spreading surface and directed to the powder-spreading surface to guide the powder to the powder-pressing surface, and since the powder-pressing surface is a plane parallel to the powder-spreading surface, the powder is guided to the powder-pressing surface and then the powder-pressing surface compacts the powder, the powder can be compacted by the scraper while the powder is spread, and the printing efficiency is improved. In the second aspect, since the doctor blade is held between the jig main body and the pressing plate, and the pressing plate is connected to the jig main body by the screw connection, the doctor blade can be easily detached or replaced. The third aspect, owing to be provided with the scraper mounting groove, and be connected the back at clamp plate and anchor clamps main part, each surface of the connecting portion of scraper and each spacing face laminating of scraper mounting groove support the displacement of restraint scraper through the rigidity, so the installation of scraper is more reliable. In the fourth aspect, since the clamp main body is connected with the scraper base by the screw thread connection, the clamp main body can be conveniently mounted on the scraper base or be conveniently dismounted from the scraper base. In the fifth aspect, since the long hole is provided in the jig main body, the mounting bolt is moved in the long hole in the longitudinal direction of the long hole, and the distance between the scraper and the powder spreading surface can be adjusted. In the sixth aspect, since the scraper holder and the scraper connecting portion are respectively located on both sides of the scraper seat connecting portion in the direction perpendicular to the scraper mounting surface, it can be ensured that the scraper seat does not interfere with the scraper connecting portion in movement when the distance between the scraper and the powder spreading surface is adjusted. In the seventh aspect, the powder scraping surface is a convex arc, the acting force of the powder scraping surface on the powder and the acting force of the powder pressing surface on the powder are in smooth transition, and the two acting forces do not have sudden changes in magnitude and direction, so that the phenomena of powder bouncing and powder lifting caused by vibration caused by sudden changes of the acting forces can be prevented. Eighth aspect, because the scraper is made of flexible material, can cushion and absorb the vibration between scraper and the powder, the powder that appears of further preventing when spreading the powder plays powder and raises the powder phenomenon. Ninth, owing to be provided with the fillet, prevent to appear stress concentration on the intersection line of two faces, prolong the life of scraper.
Referring to fig. 9 and 10, fig. 9 is a schematic structural diagram of a scraper in a powder spreading device according to a fourth embodiment of the present invention, fig. 10 is a side view of the schematic structural diagram of the scraper in the powder spreading device according to the fourth embodiment of the present invention, and in combination with fig. 9 and 10, unlike the powder spreading device shown in fig. 1 to 6, in this embodiment:
Further, in the vertical cross section, the powder scraping surface 121B is a concave arc, and the powder scraping surface 121B is tangent to the powder pressing surface 122.
the vertical cross-section is perpendicular to the dusting surface 300 and is normal to the length of the scraper 100.
the fact that the powder scraping surface 121B is a concave arc means that the second derivative of the curve equation of the arc of the powder scraping surface 121B is a positive value in the plane coordinate system.
Since the powder scraping surface 121B is a concave arc, more powder can be pressed against the powder pressing surface 122. In practical application, the more the powder pressing surface 122 compacts, the denser the fused and molded structure is, and the stronger the stress capability of the printed finished product is, so that when the powder scraping surface 121B is a concave arc, the stress capability of the three-dimensional printed finished product can be improved.
further, the scraper 100 is made of a flexible material, which may be, for example, nitrile rubber, silicone rubber, natural rubber, or the like.
in practical application, if the surface of the printed element has a warping structure or splashes fall on the surface of the printed element, a rigid scraper can generate a cutter clamping phenomenon or scrape the surface of a part, while the scraper 100 in the embodiment is made of a flexible material, so that rigid collision cannot be generated between the scraper and the part, vibration between the scraper and powder can be buffered and absorbed, the condition that the cutter is clamped or the surface of the part is scratched when powder is spread is prevented, and the phenomena of powder bouncing and powder lifting during powder spreading can be prevented.
A fillet 111E is provided between the first plane 111A and the third plane 111C, a fillet 111E is provided between the first plane 111A and the fourth plane 111D, a fillet 111E is provided between the second plane 111B and the third plane 111C, and a fillet 111E is provided between the second plane 111B and the fourth plane 111D
It should be noted that, since the rounded corners 111E are provided, stress concentration at the intersection lines of the two surfaces is prevented, and the service life of the blade 100 is prolonged.
In this embodiment, in the first aspect, when the powder is spread, the powder-scraping surface pushes the powder, and component forces in two directions are generated in the pushing process, where the component force in one direction is parallel to the powder-spreading surface to spread the powder on the powder-spreading surface, and the component force in the other direction is perpendicular to the powder-spreading surface and directed to the powder-spreading surface to guide the powder to the powder-pressing surface, and since the powder-pressing surface is a plane parallel to the powder-spreading surface, the powder is guided to the powder-pressing surface and then the powder-pressing surface compacts the powder, the powder can be compacted by the scraper while the powder is spread, and the printing efficiency is improved. In the second aspect, since the doctor blade is held between the jig main body and the pressing plate, and the pressing plate is connected to the jig main body by the screw connection, the doctor blade can be easily detached or replaced. The third aspect, owing to be provided with the scraper mounting groove, and be connected the back at clamp plate and anchor clamps main part, each surface of the connecting portion of scraper and each spacing face laminating of scraper mounting groove support the displacement of restraint scraper through the rigidity, so the installation of scraper is more reliable. In the fourth aspect, since the clamp main body is connected with the scraper base by the screw thread connection, the clamp main body can be conveniently mounted on the scraper base or be conveniently dismounted from the scraper base. In the fifth aspect, since the long hole is provided in the jig main body, the mounting bolt is moved in the long hole in the longitudinal direction of the long hole, and the distance between the scraper and the powder spreading surface can be adjusted. In the sixth aspect, since the scraper holder and the scraper connecting portion are respectively located on both sides of the scraper seat connecting portion in the direction perpendicular to the scraper mounting surface, it can be ensured that the scraper seat does not interfere with the scraper connecting portion in movement when the distance between the scraper and the powder spreading surface is adjusted. In the seventh aspect, the powder scraping surface is a concave arc, so that more powder can be pressed to the powder pressing surface, and the stress capacity of a finished product obtained by three-dimensional printing is improved. Eighth aspect, because the scraper is made of flexible material, can cushion and absorb the vibration between scraper and the powder, the powder that appears of further preventing when spreading the powder plays powder and raises the powder phenomenon. Ninth, owing to be provided with the fillet, prevent to appear stress concentration on the intersection line of two faces, prolong the life of scraper.
Referring to fig. 11 and 12, fig. 11 is a schematic structural diagram of a scraper in a powder spreading device according to a fifth embodiment of the present invention, fig. 12 is a side view of the schematic structural diagram of the scraper in the powder spreading device according to the fifth embodiment of the present invention, and with reference to fig. 11 and 12, the powder spreading device shown in fig. 1 to 6 is different from the powder spreading device shown in fig. 1 to 6 in that, in this embodiment:
further, the powder scraping surface 121 includes a first arc surface 121C and a second arc surface 121D.
One end of the first arc surface 121C is connected to the connecting portion 110, the other end of the first arc surface 121C is connected to one end of the second arc surface 121D, and the other end of the second arc surface 121D is connected to the powder pressing surface 122.
In the vertical section, the first arc 121C is a concave arc, the first arc 121D is a convex arc, the concave arc is tangent to the convex arc, and the convex arc is tangent to the powder pressing surface 122.
the vertical cross-section is perpendicular to the dusting surface 300 and is normal to the length of the scraper 100.
The first arc surface 121C is a concave arc, which means that the second derivative of the curve equation of the arc of the first arc surface 121C is a positive value in the plane coordinate system. The second arc surface 121D is a convex arc, which means that the second derivative of the curve equation of the arc of the second arc surface 121D is a negative value in the plane coordinate system.
because first arc surface 121C is the concave circular arc, can press more powder to second arc surface 121D, second arc surface 121D is the convex circular arc, and second arc surface 121D is to the effort of powder and the gentle transition of the effort of powder pressing face 122 to the powder, and there is not the sudden change in two efforts in size and direction, so can prevent because the phenomenon of the play powder that the vibration that the effort sudden change caused and raise the powder.
Further, the scraper 100 is made of a flexible material, which may be, for example, nitrile rubber, silicone rubber, natural rubber, or the like.
Optionally, the scraper 100 includes a protective sheath and a blade body, the protective sheath is made of a wear-resistant flexible material, for example, the protective sheath may be made of nitrile rubber, and the blade body is made of a common flexible material, for example, the blade body is made of common rubber, so as to reduce the manufacturing cost of the scraper. This protective sheath detachably is fixed in the surface of blade, and the protective sheath is used for scraping the powder, and the protective sheath wearing and tearing back can directly be changed.
in practical application, if the surface of the printed element has a warping structure or splashes fall on the surface of the printed element, a rigid scraper can generate a cutter clamping phenomenon or scrape the surface of a part, while the scraper 100 in the embodiment is made of a flexible material, so that rigid collision cannot be generated between the scraper and the part, vibration between the scraper and powder can be buffered and absorbed, the condition that the cutter is clamped or the surface of the part is scratched when powder is spread is prevented, and the phenomena of powder bouncing and powder lifting during powder spreading can be prevented.
A fillet 111E is provided between the first plane 111A and the third plane 111C, a fillet 111E is provided between the first plane 111A and the fourth plane 111D, a fillet 111E is provided between the second plane 111B and the third plane 111C, and a fillet 111E is provided between the second plane 111B and the fourth plane 111D
it should be noted that, since the rounded corners 111E are provided, stress concentration at the intersection lines of the two surfaces is prevented, and the service life of the blade 100 is prolonged.
In this embodiment, in the first aspect, when the powder is spread, the powder-scraping surface pushes the powder, and component forces in two directions are generated in the pushing process, where the component force in one direction is parallel to the powder-spreading surface to spread the powder on the powder-spreading surface, and the component force in the other direction is perpendicular to the powder-spreading surface and directed to the powder-spreading surface to guide the powder to the powder-pressing surface, and since the powder-pressing surface is a plane parallel to the powder-spreading surface, the powder is guided to the powder-pressing surface and then the powder-pressing surface compacts the powder, the powder can be compacted by the scraper while the powder is spread, and the printing efficiency is improved. In the second aspect, since the doctor blade is held between the jig main body and the pressing plate, and the pressing plate is connected to the jig main body by the screw connection, the doctor blade can be easily detached or replaced. The third aspect, owing to be provided with the scraper mounting groove, and be connected the back at clamp plate and anchor clamps main part, each surface of the connecting portion of scraper and each spacing face laminating of scraper mounting groove support the displacement of restraint scraper through the rigidity, so the installation of scraper is more reliable. In the fourth aspect, since the clamp main body is connected with the scraper base by the screw thread connection, the clamp main body can be conveniently mounted on the scraper base or be conveniently dismounted from the scraper base. In the fifth aspect, since the long hole is provided in the jig main body, the mounting bolt is moved in the long hole in the longitudinal direction of the long hole, and the distance between the scraper and the powder spreading surface can be adjusted. In the sixth aspect, since the scraper holder and the scraper connecting portion are respectively located on both sides of the scraper seat connecting portion in the direction perpendicular to the scraper mounting surface, it can be ensured that the scraper seat does not interfere with the scraper connecting portion in movement when the distance between the scraper and the powder spreading surface is adjusted. In the seventh aspect, the powder scraping surface comprises a first arc surface and a second arc surface, the first arc surface is a concave arc, and the second arc surface is a convex arc, so that more powder can be pressed to the powder pressing surface, the stress capability of a finished product obtained by three-dimensional printing is improved, and the phenomena of powder bouncing and powder lifting caused by vibration due to sudden change of acting force can be prevented. Eighth aspect, because the scraper is made of flexible material, can cushion and absorb the vibration between scraper and the powder, the powder that appears of further preventing when spreading the powder plays powder and raises the powder phenomenon. Ninth, owing to be provided with the fillet, prevent to appear stress concentration on the intersection line of two faces, prolong the life of scraper.
in the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
Above be right the utility model provides a spread powder device's description, to the technical personnel in the field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.
Claims (10)
1. A powder paving device, comprising: the scraper is positioned between the cutter frame and the powder spreading surface;
The scraper comprises a connecting part and a powder scraping part, and the powder scraping part comprises a powder scraping surface and a powder pressing surface;
one end of the connecting part is connected with the tool rest, the other end of the connecting part is connected with one end of the powder scraping surface, and the other end of the powder scraping surface is connected with the powder pressing surface;
The powder scraping surface is an arc surface, the powder pressing surface is a plane, and the powder pressing surface is parallel to the powder spreading surface.
2. A dusting apparatus as claimed in claim 1, wherein said tool holder comprises a clamp body and two pressure plates;
The connecting part comprises a first part and a second part, the pressure plate is detachably fixed on the clamp main body, and the first part is clamped between the two pressure plates and the clamp main body;
The second part penetrates through a gap between the two pressing plates, one end of the second part is connected with the first part, and the other end of the second part is connected with the powder scraping part.
3. A dusting apparatus as claimed in claim 2 wherein said first portion includes first and second opposed planar surfaces, said first planar surface being parallel to said dusting surface;
The first part also comprises a third plane and a fourth plane which are opposite, the third plane and the fourth plane are connected with the first plane and the second plane, and included angles between the third plane and the first plane and included angles between the fourth plane and the first plane are the same and are all non-obtuse angles;
The clamp main body comprises a scraper mounting surface, the scraper mounting surface faces the powder spreading surface, a mounting groove is formed in the scraper mounting surface and comprises a first limiting surface, a second limiting surface and a third limiting surface, the first limiting surface is attached to the first plane, the second limiting surface is attached to the third plane, and the third limiting surface is attached to the fourth plane;
the second part comprises a fifth plane and a sixth plane which are opposite to each other, the fifth plane and the sixth plane are perpendicular to the second plane, one end of the fifth plane and one end of the sixth plane are connected with the second plane, the number of the pressing plates is two, the fifth plane and the sixth plane penetrate through a gap between the two pressing plates, and the other end of the fifth plane and the other end of the sixth plane are connected with one end of the powder scraping surface;
The pressing plates comprise fourth limiting surfaces, fifth limiting surfaces and sixth limiting surfaces, the fifth limiting surfaces are connected with the fourth limiting surfaces and the sixth limiting surfaces, the fourth limiting surfaces of the two pressing plates are respectively attached to the third plane and the fourth plane, the fifth limiting surfaces of the two pressing plates are both attached to the second plane, and the sixth limiting surfaces of the two pressing plates are respectively attached to the fifth plane and the sixth plane.
4. A dusting apparatus as claimed in claim 3, characterised in that the dusting apparatus further comprises a connecting bolt;
The pressing plate further comprises a first mounting surface and a second mounting surface which are opposite, the first mounting surface and the second mounting surface are parallel to the scraper mounting surface, and the second mounting surface is attached to the scraper mounting surface;
the pressing plate is also provided with a first mounting hole, the first mounting hole penetrates through the first mounting surface and the second mounting surface, and the axis of the first mounting hole is perpendicular to the first mounting surface;
And a second mounting hole is formed in the scraper mounting surface, the first mounting hole is coaxial with the second mounting hole, and the connecting bolt penetrates through the first mounting hole and the second mounting hole so as to realize the fixation of the scraper in the mounting groove through the pressing plate and the mounting groove.
5. the powder paving device as recited in claim 4, wherein in vertical section, the powder scraping surface is a convex circular arc, and the convex circular arc is tangent to the powder pressing surface;
the vertical section is perpendicular to the powder spreading surface, and the vertical section takes the length direction of the scraper as a normal line.
6. A powder spreading device as claimed in claim 4, wherein in vertical section, the powder scraping surface is a concave arc;
The vertical section is perpendicular to the powder spreading surface, and the vertical section takes the length direction of the scraper as a normal line.
7. A powder spreading device as claimed in claim 4, wherein the powder scraping surface comprises a first circular arc surface and a second circular arc surface;
One end of the first arc surface is connected with the connecting part, the other end of the first arc is connected with one end of the second arc, and the other end of the second arc surface is connected with the powder pressing surface;
On a vertical section, the first arc surface is a concave arc, the second arc surface is a convex arc, the concave arc is tangent to the convex arc, and the convex arc is tangent to the powder pressing surface;
the vertical section is perpendicular to the powder spreading surface, and the vertical section takes the length direction of the scraper as a normal line.
8. A powder spreading device as claimed in any one of claims 5 to 7, further comprising a scraper seat and a fixing bolt;
The clamp main body further comprises a scraper seat mounting surface;
The scraper seat mounting surface is perpendicular to the scraper mounting surface, a long hole is formed in the scraper seat mounting surface, and the length direction of the long hole is perpendicular to the scraper mounting surface;
the scraper seat is provided with a clamp mounting hole, and the fixing bolt penetrates through the long hole and the clamp mounting hole so as to detachably fix the clamp main body on the scraper seat.
9. A dusting apparatus as claimed in claim 8 wherein said clamp body includes a doctor blade holder connection portion and a doctor blade connection portion;
the scraper seat connecting part comprises a scraper seat mounting surface, the scraper connecting part comprises a scraper mounting surface, and the scraper connecting part is connected with the scraper seat mounting surface;
and the scraper connecting part and the scraper seat are respectively positioned at two sides of the scraper seat connecting part in the direction vertical to the scraper seat mounting surface.
10. a dusting apparatus as claimed in claim 9, characterised in that the scraper is made of a flexible material;
A fillet is arranged between the first plane and the third plane, a fillet is arranged between the first plane and the fourth plane, a fillet is arranged between the second plane and the third plane, and a fillet is arranged between the second plane and the fourth plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822198131.1U CN209754013U (en) | 2018-12-25 | 2018-12-25 | Powder spreading device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822198131.1U CN209754013U (en) | 2018-12-25 | 2018-12-25 | Powder spreading device |
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| CN209754013U true CN209754013U (en) | 2019-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620659A (en) * | 2020-12-11 | 2021-04-09 | 西安增材制造国家研究院有限公司 | Powder scraping device for high-temperature printing system |
-
2018
- 2018-12-25 CN CN201822198131.1U patent/CN209754013U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620659A (en) * | 2020-12-11 | 2021-04-09 | 西安增材制造国家研究院有限公司 | Powder scraping device for high-temperature printing system |
| CN112620659B (en) * | 2020-12-11 | 2022-08-30 | 西安增材制造国家研究院有限公司 | Powder scraping device for high-temperature printing system |
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Effective date of registration: 20230519 Address after: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Patentee after: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Address before: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Patentee before: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Patentee before: HAN'S LASER SMART EQUIPMENT GROUP Co.,Ltd. |
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