阅读说明：本技术 一种适用于多粉体的选择性激光烧结打印机 (Selective laser sintering printer suitable for multiple powder bodies ) 是由 陈健 周莉 李芯怡 黄怿平 黄泽聪 郑振兴 熊峰 涂有深 李钰音 方新秀 余淑辉 于 2019-08-22 设计创作，主要内容包括：本发明公开一种适用于多粉体的选择性激光烧结打印机,包括机架、储粉装置、供粉装置、铺粉装置、成型装置、激光扫描模块以及粉料回收装置；其中,所述储粉装置包括多个用于存储不同粉料的储粉罐和用于摆放储粉罐的储粉柜；所述成型装置包括成型腔,所述激光扫描模块位于成型腔的上方；所述供粉装置包括用于将储粉罐从储粉柜中取出并送至成型腔的上方的搬运机械手,所述储粉罐的底部控制落料的开关的控制阀；工作时,搬运机械手将储粉罐从储粉柜中转移至成型腔的正上方,储粉罐中的控制阀打开,粉料从出粉通道中落到成型腔中。该选择性激光烧结打印机能够用于多种不同材料的烧结打印,且不会发生粉料混合,有效保证零件的打印质量。(The invention discloses a selective laser sintering printer suitable for multiple powders, which comprises a rack, a powder storage device, a powder supply device, a powder spreading device, a forming device, a laser scanning module and a powder recovery device, wherein the powder storage device is arranged on the rack; the powder storage device comprises a plurality of powder storage tanks for storing different powder materials and a powder storage cabinet for placing the powder storage tanks; the forming device comprises a forming cavity, and the laser scanning module is positioned above the forming cavity; the powder supply device comprises a conveying manipulator which is used for taking out the powder storage tank from the powder storage cabinet and conveying the powder storage tank to the upper part of the forming cavity, and a control valve for controlling the on-off of blanking at the bottom of the powder storage tank; during operation, the conveying manipulator transfers the powder storage tank to the molding cavity from the powder storage cabinet, the control valve in the powder storage tank is opened, and the powder falls into the molding cavity from the powder outlet channel. The selective laser sintering printer can be used for sintering and printing of various different materials, powder mixing cannot occur, and the printing quality of parts is effectively guaranteed.)

1. A selective laser sintering printer suitable for multiple powder bodies is characterized by comprising a rack, a powder storage device, a powder supply device, a powder paving device, a forming device, a laser scanning module and a powder recovery device, wherein the powder storage device, the powder supply device, the powder paving device, the forming device, the laser scanning module and the powder recovery device are arranged on the rack;

the powder storage device comprises a plurality of powder storage tanks for storing different powder materials and a powder storage cabinet for placing the powder storage tanks, wherein the powder storage cabinet is provided with a plurality of storage positions, and the powder storage tanks are placed in the storage positions;

the forming device comprises a forming cavity, and the laser scanning module is positioned above the forming cavity; the powder supply device comprises a carrying manipulator which is used for taking out the powder storage tank from the storage position of the powder storage cabinet and sending the powder storage tank to the upper part of the forming cavity, the bottom of the powder storage tank is provided with a powder outlet channel communicated with the inner cavity, and a control valve is arranged in the powder outlet channel; during operation, the conveying manipulator transfers the powder storage tank to the molding cavity from the powder storage cabinet, the control valve in the powder storage tank is opened, and the powder falls into the molding cavity from the powder outlet channel.

2. The selective laser sintering printer for multiple powders according to claim 1, wherein the powder storage cabinet is provided with a roll-type opening and closing mechanism, and the roll-type opening and closing mechanism comprises a reel, a rolling shutter plate and a rolling shutter driving mechanism for driving the reel to rotate; the two rolling shafts are respectively arranged at two ends of the powder storage cabinet, two ends of the rolling shutter plate are respectively fixedly wound on the two rolling shafts, and the rolling shutter plate transversely moves in front of the opening of the storage position under the driving of the rolling shutter driving mechanism;

the roller shutter plate is provided with a pick-and-place opening for avoiding the carrying manipulator to pick and place the powder storage tank.

3. The selective laser sintering printer for multiple powders according to claim 2, wherein the rolling type opening and closing mechanism is two groups, two rolling shutter plates are overlapped and arranged in front of the opening of the storage position, and the extending directions of the two rolling shutter plates are respectively X direction and Y direction;

the taking and placing ports of the two roller shutter plates are respectively an X-direction taking and placing port and a Y-direction taking and placing port, the length of the X-direction taking and placing port extends along the Y direction, and the length of the X-direction taking and placing port is greater than the distance spanned by the powder storage tanks when the powder storage tanks are arranged in the Y direction; the length of the Y-direction access opening extends along the X direction, and the length of the Y-direction access opening is larger than the distance spanned by the powder storage tanks in the X-direction arrangement.

4. The selective laser sintering printer for multiple powders according to claim 1, wherein the forming device comprises a working platform, a forming table and a lifting driving mechanism for driving the forming table to move up and down, the working platform is provided with a forming hole, and the forming table is arranged in the forming hole; in the molding hole, a space between the upper surface of the molding table and the upper surface of the working platform forms the molding cavity.

5. The selective laser sintering printer for multiple powders according to claim 1, wherein the powder spreading device comprises a spreading trolley and a powder spreading driving mechanism for driving the spreading trolley to move transversely, the spreading trolley comprises a mounting frame, a scraper for scraping the powder and a rolling roller for compacting the spread powder, and the rolling roller is rotatably connected to the mounting frame; when the powder compacting machine works, the rolling rollers are arranged behind the scraper plate to compact the paved powder.

6. The selective laser sintering printer for multiple powders according to claim 5, wherein the number of the scrapers is two, and the scrapers are respectively arranged on two sides of the rolling roller;

the mounting frame is provided with a position adjusting mechanism for adjusting the height positions of the two scraping plates, the position adjusting mechanism comprises an adjusting driving motor and an adjusting rod, the adjusting driving motor is fixedly arranged on the mounting frame, two ends of the adjusting rod are provided with adjusting holes, and the middle part of the adjusting rod is fixedly connected with an output shaft of the adjusting driving motor; the two scraping plates are respectively connected in the adjusting holes through rotating shafts; two vertically arranged guide limiting holes are formed in the mounting rack, and the lower end of the scraper is positioned in the guide limiting holes; the rolling roller is rotatably connected to a sliding pressing block which can move up and down relative to the mounting frame, a bearing part for bearing the mounting frame is arranged on the mounting frame, and a moving space for the sliding pressing block to move up relatively is arranged above the bearing part; and a pressurizing spring is arranged in the movable space, and two ends of the pressurizing spring are respectively abutted against the sliding pressing block and the mounting frame.

7. The selective laser sintering printer for multiple powders according to claim 1, wherein the powder recycling device comprises a recycling hopper for receiving the rest of the powder and a powder returning mechanism for transferring the rest of the processed powder into the recycling hopper, the powder returning mechanism comprises an air blower and a suction fan, the air blower and the suction fan are respectively positioned at two sides of the molding cavity, and the end of the suction fan is provided with an intermediate material pipe for guiding the powder into the recycling hopper;

the recovery hopper is provided with a plurality of accommodating grooves; the powder recovery device also comprises a classified recovery device, and the classified recovery device comprises the accommodating grooves, the intermediate material pipe and a switching driving mechanism for driving the tail end of the intermediate material pipe to switch back and forth between different accommodating grooves.

8. The selective laser sintering printer for multiple powders according to claim 7, wherein the plurality of receiving grooves are uniformly arranged along a circumferential direction; the switching driving mechanism comprises a switching driving motor and a crank oscillating bar component, the crank oscillating bar component comprises a crank rod, a connecting rod and an oscillating bar, one end of the oscillating bar is connected with an output shaft of the switching driving motor through an intermediate transmission structure, and the other end of the oscillating bar is hinged with the connecting rod; one end of the crank rod is fixedly connected with the fixed pipe of the intermediate material pipe, and the other end of the crank rod is hinged with the connecting rod; two ends of the connecting rod are respectively hinged with the crank rod and the oscillating bar; the intermediate material pipe comprises a blanking pipe and the fixed pipe, and powder enters the accommodating groove from the blanking pipe; when different storage grooves are switched, the intermediate material pipe stops at the position of the last storage groove for a specific time, and after the powder in the intermediate material pipe is completely discharged, the intermediate material pipe is transferred to the position of the next storage groove.

9. The selective laser sintering printer for multiple powders according to claim 1, wherein the handling manipulator comprises a clasping clamp for clamping the powder storage tank and a position moving mechanism for driving the clasping clamp to perform spatial displacement, and the position moving mechanism comprises a lifting driving mechanism, a transverse driving mechanism and a rotary reversing mechanism;

the lifting driving mechanism comprises a lifting driving cylinder, the lifting driving cylinder is fixed on a lifting mounting plate, and the lifting mounting plate is connected with the output end of the transverse driving mechanism; the holding clamp is connected to a telescopic rod of the lifting driving cylinder through a lifting transmission plate; the lifting transmission plate is provided with a rotating element for driving the clasping clamp to rotate; the transverse driving mechanism comprises a transverse driving cylinder which is fixed on the transverse mounting plate, and a telescopic rod of the transverse driving cylinder is fixedly connected with the lifting mounting plate; the transverse mounting plate is connected with the output end of the rotary reversing mechanism; the rotary reversing mechanism comprises a rotary driving cylinder and a rotary transmission rod, the transverse mounting plate is fixedly connected with the rotary transmission rod, and the rotary driving cylinder is fixed on the rack through a fixing plate.

10. The selective laser sintering printer for multiple powders according to claim 1, wherein the powder supply device further comprises a transfer support, the transfer support is arranged right above the forming cavity, and two suspension arms are arranged on the transfer support; the both sides of storing up the powder jar all are equipped with the portion of hanging, and during operation, the transport manipulator takes out after storing up the powder jar, puts it on the transfer support, stores up the powder jar and stops and spread down on the transfer support.

Technical Field

The invention relates to 3D printing equipment, in particular to a selective laser sintering printer suitable for multiple powder bodies.

Background

3D printing and forming, also called Additive Manufacturing (AM), combines computer aided design, material processing and forming technology and digital model file and other technologies, and stacks and forms printing materials (such as metal materials, plastic materials and medical biological materials and the like) layer by layer from bottom to top through software and a numerical control system on the basis of the digital model file; unlike the conventional molding technology (mainly performing material reduction processing on raw materials, such as cutting, grinding and the like), the 3D printing technology is a manufacturing technology which is accumulated through materials from the beginning, and can realize processing which is difficult to realize by the conventional molding technology and make up for the defects of the conventional molding technology.

At present, the forming process of 3D printing mainly includes fused deposition forming, photocuring forming, laser sintering forming, three-dimensional powder bonding forming, and the like, wherein the fused deposition forming and the laser sintering forming are widely used in production and manufacturing. In fused deposition molding, materials are melted into liquid by high temperature and are sprayed out through a nozzle capable of moving in the X-Y direction, and three-dimensional objects are formed in a three-dimensional space in a layer-by-layer arrangement mode and are often used for molding high polymer materials (plastics); in laser sintering molding, powder of a material is spread and scraped on a bearing surface, the powder which is just spread is irradiated by a high-intensity laser, the powder is sintered, so that one section of a part is obtained, and after multiple times of sintering, the sections which are adhered layer by layer are stacked to form a desired part, which is often used for molding metal materials and ceramic materials.

In order to improve the application range of the traditional laser sintering printing technology, laser sintering printing equipment capable of being used for various different materials is proposed in the prior art, for example, an invention patent with an authorization publication number of CN 105618755B discloses a powder supplying and spreading method and device for 3D printing of a multi-material part, wherein the powder supplying and spreading device comprises a powder supplying unit and a powder spreading unit positioned below the powder supplying unit, the powder supplying unit comprises a plurality of powder supplying hoppers, a plurality of connecting pipes and a powder homogenizer, and the bottom of each powder supplying hopper is connected with the powder homogenizer by the plurality of connecting pipes; spread powder unit and spread powder unit is including spreading powder box and powder collecting box, the roof of powder collecting box is provided with surplus powder and collects the mouth and is used for collecting and spreads powder box and shaping unnecessary powder material in the platform top. In the multi-material printing apparatus described above, although it can be used for printing of a plurality of different materials, there are the following problems: a plurality of different powders (different powders correspond to different layers of parts) need to pass through the same channel (powder homogenizer) to fall on the forming platform, although the time for passing through the powder homogenizer is different, the powder homogenizer may have some residues, and if the residual powders are mixed with different powders, the forming quality of the target part is influenced.

Disclosure of Invention

The invention aims to overcome the existing problems and provide a selective laser sintering printer suitable for multiple powder bodies, which can be used for sintering and printing of multiple different materials, does not generate powder mixing and effectively ensures the printing quality of parts.

The purpose of the invention is realized by the following technical scheme:

a selective laser sintering printer suitable for multiple powder bodies comprises a rack, and a powder storage device, a powder supply device, a powder spreading device, a forming device, a laser scanning module and a powder recovery device which are arranged on the rack;

the powder storage device comprises a plurality of powder storage tanks for storing different powder materials and a powder storage cabinet for placing the powder storage tanks, wherein the powder storage cabinet is provided with a plurality of storage positions, and the powder storage tanks are placed in the storage positions;

the forming device comprises a forming cavity, and the laser scanning module is positioned above the forming cavity; the powder supply device comprises a carrying manipulator which is used for taking out the powder storage tank from the storage position of the powder storage cabinet and sending the powder storage tank to the upper part of the forming cavity, the bottom of the powder storage tank is provided with a powder outlet channel communicated with the inner cavity, and a control valve is arranged in the powder outlet channel; during operation, the conveying manipulator transfers the powder storage tank to the molding cavity from the powder storage cabinet, the control valve in the powder storage tank is opened, and the powder falls into the molding cavity from the powder outlet channel.

The working principle of the selective laser sintering printer is as follows:

when the powder sintering machine works, after powder to be sintered is determined according to specific parameters of a three-dimensional model of a multi-material object, the carrying manipulator moves close to the powder storage cabinet, takes out a powder storage tank containing the powder, and conveys the powder to the position right above a molding cavity; then, a control valve in the powder storage tank is opened, the powder falls into the molding cavity from the powder outlet channel, and when the falling powder reaches a certain amount, the control valve is closed to block the falling of the powder; the powder material can not be flatly and uniformly filled in the molding cavity because the powder material enters the molding cavity from top to bottom in a free-falling mode, and therefore the powder material needs to be paved through a powder paving device.

And after the powder to be sintered is paved in the molding cavity, the laser scanning module scans and sinters the powder in the molding cavity according to the parameters of the model, and the sintered powder is cooled and then is fixed and molded, so that the printing work of one section is completed. After the current layer is processed, the layer and the layer below the layer which is printed are moved downwards for a certain distance (the distance is equal to the thickness of the layer to be printed of the next layer), at the moment, the depth of the forming cavity is increased by the depth of the next layer to be printed, and the top of the forming cavity is free of the printing space of the next layer so as to continuously finish the printing work of the next layer.

After the preparation of the forming cavity is completed, the powder storage tank for next layer powder is transferred to the upper side of the forming cavity by the carrying manipulator, the powder in the powder storage tank falls into the forming cavity, the powder spreading device spreads the powder again, the laser scanning module scans and sinters the laid powder, and the powder is stacked layer by layer until the whole three-dimensional entity is stacked. In the sintering process, if the material of the next layer is different from the material of the previous layer, the powder recovery device can recover the residual powder of the previous layer before the printing work of the next layer is started.

According to a preferable scheme of the invention, a rolling type opening and closing mechanism is arranged on the powder storage cabinet, and comprises a scroll, a rolling shutter plate and a rolling shutter driving mechanism for driving the scroll to rotate; the two rolling shafts are respectively arranged at two ends of the powder storage cabinet, two ends of the rolling shutter plate are respectively fixedly wound on the two rolling shafts, and the rolling shutter plate transversely moves in front of the opening of the storage position under the driving of the rolling shutter driving mechanism;

the roller shutter plate is provided with a pick-and-place opening for avoiding the carrying manipulator to pick and place the powder storage tank. Through the structure, when the roller shutter driving mechanism works, the roller shutter driving mechanism can drive the roller to rotate so as to drive the roller shutter plate to move, so that the taking and placing opening on the roller shutter plate rotates to the position right in front of the powder storage tank to be carried, and the carrying manipulator is avoided to take and place; further, under the non-operating condition (or need not get under the condition of putting the powder storage tank of putting), roll up curtain actuating mechanism and can drive roll up the curtain board (roll up the curtain board and can make by flexible material, for example plastics or paper material etc.) and get into encapsulated situation, roll up the mouth of putting of curtain board and can not deposit the position intercommunication with any one this moment, can be isolated with the powder storage tank like this and store up in the position of powder cabinet, reduce and contact with external environment to avoid other unstable factors such as external air to cause the influence to the powder.

Preferably, the two rolling type opening and closing mechanisms are two groups, two rolling shutter plates are overlapped and arranged in front of the opening of the storage position, and the extending directions of the two rolling shutter plates are respectively in the X direction and the Y direction;

the taking and placing ports of the two roller shutter plates are respectively an X-direction taking and placing port and a Y-direction taking and placing port, the length of the X-direction taking and placing port extends along the Y direction, and the length of the X-direction taking and placing port is greater than the distance spanned by the powder storage tanks when the powder storage tanks are arranged in the Y direction; the length of the Y-direction access opening extends along the X direction, and the length of the Y-direction access opening is larger than the distance spanned by the powder storage tanks in the X-direction arrangement. In the structure, because two roll up the setting of curtain board overlap, get before putting the powder storage tank, need two mutually perpendicular's X to get put mouthful and Y to getting put mouthful cover simultaneously before waiting to get the powder storage tank of putting, two local positions that get put mouthful take place to overlap promptly, just can make the powder storage tank expose out, can control the size that overlaps the position like this and adjust the size that gets of putting the mouth that the intercommunication was deposited the position, make the position that the powder storage tank that the non-waited to get put corresponds keep sealed, thereby avoid the powder storage tank and the external contact in the powder storage cabinet to the at utmost. The length of the X-direction taking and placing opening is larger than the crossing distance of the powder storage tanks in the Y-direction arrangement, the length of the Y-direction taking and placing opening is larger than the crossing distance of the powder storage tanks in the X-direction arrangement, under the drive of the rolling curtain driving mechanisms, the X-direction taking and placing opening moves towards the X direction, and the Y-direction taking and placing opening moves towards the Y direction, so that the overlapped positions can be converted, and the storage positions in any arrangement form can be applicable before the overlapped positions (the taking and placing openings) are transferred to any storage positions.

According to a preferable scheme of the invention, a temperature control module and a humidity control module are arranged in the powder storage cabinet and used for controlling the temperature and the humidity in the cabinet, so that the quality of powder is protected.

In a preferred embodiment of the present invention, the carrying manipulator includes a clasping clamp for clamping the powder storage tank and a position moving mechanism for driving the clasping clamp to perform spatial displacement, and the position moving mechanism includes a lifting driving mechanism, a transverse driving mechanism and a rotary reversing mechanism.

Preferably, the lifting driving mechanism comprises a lifting driving cylinder which is fixed on a lifting mounting plate, and the lifting mounting plate is connected with the output end of the transverse driving mechanism; the holding clamp is connected to a telescopic rod of the lifting driving cylinder through a lifting transmission plate; the transverse driving mechanism comprises a transverse driving cylinder which is fixed on the transverse mounting plate, and a telescopic rod of the transverse driving cylinder is fixedly connected with the lifting mounting plate; the transverse mounting plate is connected with the output end of the rotary reversing mechanism; the rotary reversing mechanism comprises a rotary driving cylinder and a rotary transmission rod, the transverse mounting plate is fixedly connected with the rotary transmission rod, and the rotary driving cylinder is fixed on the rack through a fixing plate. Through the structure, the driving direction of the transverse driving mechanism can be changed by the rotary reversing mechanism, so that the transverse driving mechanism can drive the clasping clamp to move towards different directions, the clasping clamp can be driven to be close to or far away from the powder storage tank, and the transverse driving mechanism can also move along the transverse arrangement direction of the powder storage tank, so that different powder storage tanks on the same horizontal plane can be grabbed; and under the driving of the lifting driving mechanism, the holding clamp can move along the vertical arrangement direction of the powder storage tanks, so that different powder storage tanks in the vertical direction can be grabbed.

Further, be equipped with vertical transport guide structure between lift driving plate and the lift mounting panel, be equipped with horizontal transport guide structure between lift mounting panel and the horizontal mounting panel.

Preferably, the clamp is equipped with two claw of holding tightly of relative parallel arrangement, be equipped with on two lateral walls of powder storage tank and grab a groove.

Furthermore, the lifting transmission plate is provided with a rotating element for driving the clasping clamp to rotate.

In a preferred embodiment of the present invention, the powder supply device further comprises a transfer support, the transfer support is disposed right above the forming cavity, and two suspension arms are disposed on the transfer support; the both sides of storing up the powder jar all are equipped with the portion of hanging, and during operation, the transport manipulator takes out after storing up the powder jar, puts it on the transfer support, stores up the powder jar and stops and spread down on the transfer support.

According to a preferable scheme of the invention, the forming device comprises a working platform, a forming table and a lifting driving mechanism for driving the forming table to move up and down, wherein the working platform is provided with a forming hole, and the forming table is arranged in the forming hole; in the molding hole, a space between the upper surface of the molding table and the upper surface of the working platform forms the molding cavity. Through above-mentioned structure, before the part begins to print, according to the tangent plane parameter of part, the vertical height of shaping chamber equals the thickness of the bottommost tangent plane of part, and along with going on constantly of sintering work, lift actuating mechanism drive forming table down moves gradually for shaping chamber grow gradually holds more powder, and the aspect of having accomplished the sintering also moves down along with the forming table, and the distance of moving at every turn equals the thickness of the aspect of treating the sintering next time, prints until the part is accomplished.

Preferably, the lifting driving mechanism comprises a lifting driving motor and a lifting transmission assembly, the lifting driving motor is fixedly connected to the rack, and the lifting transmission assembly comprises a lifting screw rod and a lifting screw rod nut; one end of the lifting screw rod is connected with an output shaft of the lifting driving motor through a coupler, and the other end of the lifting screw rod is connected to the rack through a rotating seat; the lifting screw rod nut is provided with a lifting platform, and the forming table is arranged on the lifting platform.

Furthermore, a vertical guide structure is arranged between the lifting platform and the rack and comprises a guide hole arranged on the lifting platform and a lifting guide pillar which is fixed on the rack and arranged in parallel with the lifting screw rod.

According to a preferable scheme of the invention, the powder paving device comprises a paving trolley and a powder paving driving mechanism for driving the paving trolley to move transversely, the paving trolley comprises a mounting frame, a scraper for scraping powder and a rolling roller for compacting the paved powder, and the rolling roller is rotationally connected to the mounting frame; when the powder compacting machine works, the rolling rollers are arranged behind the scraper plate to compact the paved powder. Through the structure, the powder paving device can pave powder and can compact the paved powder, so that the powder can be uniformly melted in the laser sintering process, and the printing quality is improved.

Preferably, the number of the scraping plates is two, and the scraping plates are respectively arranged on two sides of the rolling roller, so that bidirectional continuous powder paving and powder pressing can be realized, and the powder is more uniform.

Furthermore, the mounting frame is provided with a position adjusting mechanism for adjusting the height positions of the two scraping plates, the position adjusting mechanism comprises an adjusting driving motor and an adjusting rod, the adjusting driving motor is fixedly arranged on the mounting frame, two ends of the adjusting rod are provided with adjusting holes, and the middle part of the adjusting rod is fixedly connected with an output shaft of the adjusting driving motor; the two scraping plates are respectively connected in the adjusting holes through rotating shafts;

the mounting frame is provided with two vertically arranged guide limiting holes, and the lower end of the scraper is located in the guide limiting holes. Through the structure, under the driving of the adjusting driving motor, the two scraping plates are reversely adjusted like a 'wane', so that the height of the corresponding scraping plate, namely the distance between the scraping plate and the working platform can be adjusted in the corresponding occasions, and the powder scraping device is suitable for different powder scraping occasions.

Preferably, the rolling roller is rotatably connected to a sliding pressure block which can move up and down relative to the mounting frame, a bearing part for bearing the mounting frame is arranged on the mounting frame, and a movable space for the sliding pressure block to move up relatively is arranged above the bearing part. Like this, at the in-process that paves the powder, the rolling roller carries out the compaction to the powder (its effort equals the gravity of self and smooth briquetting), because smooth briquetting reciprocates relatively the mounting bracket, can self-adaptation adjustment, prevents to cause the excessive pressure to the powder.

Furthermore, a pressurizing spring is arranged in the movable space, and two ends of the pressurizing spring are respectively abutted against the sliding pressing block and the mounting frame.

Preferably, the powder paving driving mechanism comprises a transverse driving motor and a transverse transmission assembly, the transverse driving motor is fixedly connected to the rack, and the transverse transmission assembly comprises a transverse screw rod and a transverse screw rod nut; one end of the transverse screw rod is connected with an output shaft of the transverse driving motor through a coupler, and the other end of the transverse screw rod is connected to the rack through a rotating seat; and the transverse screw rod nut is provided with a transverse moving frame, and the mounting frame is fixedly connected with the transverse moving frame.

Furthermore, a transverse guide structure is arranged between the transverse moving frame and the rack and comprises a guide hole arranged on the transverse moving frame and a transverse guide pillar which is fixed on the rack and arranged in parallel with the transverse screw rod.

In a preferred embodiment of the present invention, the laser scanning module includes a laser emitting head and a scanning assembly.

Preferably, the two groups of laser scanning modules are symmetrically arranged above the forming device; the forming table and the forming holes are two, so that the printing work of two parts can be respectively carried out in the same printer, and the working efficiency of a single machine is effectively improved.

Furthermore, the two lifting driving mechanisms are respectively used for driving the two forming tables to move up and down.

According to a preferable scheme of the invention, the powder recovery device comprises a recovery hopper for containing the rest powder and a powder return mechanism for transferring the rest powder after processing into the recovery hopper, the powder return mechanism comprises an air blower and a suction fan, the air blower and the suction fan are respectively positioned on two sides of the forming cavity, and the tail end of the suction fan is provided with an intermediate material pipe for guiding the powder into the recovery hopper. Through the structure, before different powder materials are switched to be sintered or after printing is finished, the air blower blows air to the working platform and the forming cavity, the generated air flow brings moving power to the rest powder materials, and under the action of negative pressure of the suction fan, the rest powder materials can be collected into the suction fan and then are collected into the collection hopper through the intermediate material pipe.

Preferably, the recovery hopper is provided with a plurality of receiving grooves; the powder recovery device also comprises a classified recovery device, and the classified recovery device comprises the accommodating grooves, the intermediate material pipe and a switching driving mechanism for driving the tail end of the intermediate material pipe to switch back and forth between different accommodating grooves. The benefit of above-mentioned structure lies in, according to the difference of the powder of retrieving, can be with the recovery of different powders to the corresponding storage tank in the middle of switching actuating mechanism drive material pipe to realize the categorised recovery of surplus material, and then realize higher recovery reuse rate.

Further, the plurality of receiving grooves are uniformly distributed along the circumferential direction; the switching driving mechanism comprises a switching driving motor and a crank oscillating bar component, the crank oscillating bar component comprises a crank rod, a connecting rod and an oscillating bar, one end of the oscillating bar is connected with an output shaft of the switching driving motor through an intermediate transmission structure, and the other end of the oscillating bar is hinged with the connecting rod; one end of the crank rod is fixedly connected with the fixed pipe of the intermediate material pipe, and the other end of the crank rod is hinged with the connecting rod; two ends of the connecting rod are respectively hinged with the crank rod and the oscillating bar; the intermediate material pipe comprises a blanking pipe and the fixed pipe, and powder enters the containing groove from the blanking pipe. Through the structure, after the switching driving motor is transmitted to the swing rod through the middle transmission structure, the middle material pipe can rotate along the circumferential direction through the crank swing rod assembly, and therefore different powder materials are guided into different accommodating grooves.

Compared with the prior art, the invention has the following beneficial effects:

1. in the laser sintering printer of this application, through storing different powder in the storage powder jar that just can remove alone of difference, the during operation, the transport manipulator shifts the top that becomes the die cavity with the storage powder jar of dress treating the powder of sintering, and the back is opened to the control valve in the storage powder jar, and the powder falls into the die cavity, begins to pave and laser sintering work after that. Above-mentioned in-process, the material loading process of different powder does not have the intersection, belongs to the independent operation, and the powder of difference can not take place to mix at the in-process of material loading like this, can strictly control according to the powder that the different aspect of part corresponds, effectively guarantees the printing quality of part.

2. Through the transfer of carrying the manipulator, realized full-automatic intelligence and supplied the powder mode, can obtain totally closed inside operation environment, reduce staff and powder contact.

Drawings

Fig. 1-2 are schematic perspective views of two different directions of a selective laser sintering printer for multiple powders according to the present invention.

Fig. 3-4 are schematic perspective views of the selective laser sintering printer of fig. 1 with hidden parts.

Fig. 5 is an exploded view of the work platform, the forming table and the lifting platform of the present invention.

Fig. 6-7 are front views of an embodiment of the powder storage device of the present invention in two different states.

Fig. 8 is a schematic perspective view of a powder storage device according to an embodiment of the present invention.

Fig. 9 is an exploded view of the roll type opening and closing mechanism of fig. 6.

Fig. 10 is a schematic perspective view of the powder storage cabinet in fig. 6.

Fig. 11 is a schematic perspective view of the paving trolley in fig. 1.

Fig. 12 is a side view of the laydown cart of fig. 1.

FIG. 13 is a schematic perspective view of the powder recovering apparatus of the present invention.

FIGS. 14 to 15 are plan views of the powder recovering device in two different states.

FIG. 16 is a side view of the powder recovering device in the present invention.

Fig. 17 is a schematic perspective view of the transfer robot of the present invention.

Fig. 18 is a plan view of the powder storage tank being carried by the carrying robot of the present invention.

Fig. 19 is a schematic perspective view of the powder storage tank of the present invention.

Fig. 20-21 are schematic perspective views of two different viewing angles of another embodiment of the powder storage device of the present invention.

Detailed Description

In order to make those skilled in the art understand the technical solutions of the present invention well, the following description of the present invention is provided with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.