阅读说明：本技术 一种采用自适应刮板的金属打印机及其使用方法 (Metal printer adopting self-adaptive scraper and using method thereof ) 是由 祝勇仁 毛德锋 吴俊� 于 2020-11-25 设计创作，主要内容包括：一种采用自适应刮板的金属打印机,包括工作平台,工作平台上端安装有密封罩,所述工作平台内开有成型腔,所述成型腔左右两端设有出粉腔,所述成型腔设有支撑板,所述出粉腔内侧设有第二支撑板,所述第二支撑板下端设有第一升降气缸,所述密封罩上端设有激光扫描器,成型腔前后两端设有升降腔,所述升降腔内设有升降板,所述密封罩内侧前后两端分别设有丝杆和光杆,所述丝杆左端外侧设有丝杆螺母,所述滑块和丝杆螺母之间设有连接板,连接板内侧开有第一通道孔,所述第一通道孔内侧设有调节杆,所述调节杆下端设有调节板,所述调节杆外侧设有复位弹簧,所述调节板下端设有刮板,所述升降板前端平面上设有限位条,所述调节板前后两端设有滑动板。(A metal printer adopting a self-adaptive scraper comprises a working platform, a sealing cover is mounted at the upper end of the working platform, a molding cavity is formed in the working platform, powder outlet cavities are formed in the left end and the right end of the molding cavity, supporting plates are arranged in the molding cavity, a second supporting plate is arranged on the inner side of the powder outlet cavity, a first lifting cylinder is arranged at the lower end of the second supporting plate, a laser scanner is arranged at the upper end of the sealing cover, lifting cavities are formed in the front end and the rear end of the molding cavity, lifting plates are arranged in the lifting cavities, a lead screw and a polished rod are respectively arranged at the front end and the rear end of the inner side of the sealing cover, a lead screw nut is arranged on the outer side of the left end of the lead screw, a connecting plate is arranged between the slide block and the lead screw nut, a first channel hole is formed in the inner side of the, the lifting plate is characterized in that a limiting strip is arranged on the plane of the front end of the lifting plate, and sliding plates are arranged at the front end and the rear end of the adjusting plate.)

1. The utility model provides an adopt metal printer of self-adaptation scraper blade, includes work platform (1), and sealed cowling (2) are installed to work platform (1) upper end, work platform (1) inboard central point puts to open there is become die cavity (3), it is equipped with to open both ends about become die cavity (3) play powder chamber (4) on work platform (1), become die cavity (3) inboard sliding connection and have backup pad (5), it has second backup pad (6) to go out inboard sliding connection in powder chamber (4), backup pad (5) lower extreme fixedly connected with elevating gear, second backup pad (6) lower extreme is equipped with first lift cylinder (7), sealed cowling (2) upper end inboard fixedly connected with laser scanner (8), characterized by: the lifting cavity (9) which is arranged on the inner side of the working platform (1) is arranged at the front end and the rear end of the forming cavity (3), a lifting plate (10) is connected to the inner side of the lifting cavity (9) in a sliding manner, a plurality of connecting channels (11) which are uniformly arranged on the working platform (1) are arranged between the lifting cavity (9) and the forming cavity (3), a first connecting plate (12) which is arranged in the connecting channels (11) is fixedly connected to the lower end of the lifting plate (10), the front end of the first connecting plate (12) is fixedly connected with the supporting plate (5), a screw rod (13) and a polished rod (14) are respectively arranged at the front end and the rear end of the inner side of the sealing cover (2), the left end and the right end of the screw rod (13) and the polished rod (14) are respectively and rotatably connected to the inner side of the sealing cover (2), and the left end of the screw rod (13) penetrates through, the outer side of the left end of the screw rod (13) is in transmission connection with a screw nut (16), the outer side of the polish rod (14) is in sliding connection with a sliding block (17) corresponding to the screw nut (16), a connecting plate (18) is fixedly connected between the sliding block (17) and the screw nut (16), a plurality of first channel holes (19) which are uniformly arranged are formed in the inner side of the connecting plate (18), an adjusting rod (20) is in sliding connection with the inner side of the first channel holes (19), a limiting boss (21) is arranged at the upper end of the adjusting rod (20), an adjusting plate (22) is fixedly connected to the lower end of the adjusting rod (20), a reset spring (23) positioned between the connecting plate (18) and the adjusting plate (20) is arranged on the outer side of the adjusting rod (20), a scraper (24) is fixedly connected to the lower end of the adjusting plate (22), and, sliding plates (26) corresponding to the limiting strips (25) are arranged at the front end and the rear end of the adjusting plate (22), and arc parts (27) are arranged at the left end and the right end of each sliding plate (26).

2. The metal printer using the adaptive squeegee of claim 1, wherein: the lifting device is a lifting cylinder (28) which is respectively arranged in the molding cavity (3).

3. The metal printer using the adaptive squeegee of claim 1, wherein: the lifting device comprises a supporting rod (29), a fixing plate (30), a second stepping motor (31), a second lead screw nut (32) and a lifting plate (33), the supporting rod (29) is fixedly connected to the left side and the right side of the lower end of the supporting plate (5), the fixing plate (30) is fixedly connected to the central position of the inner side of the molding cavity (3), second channel holes (34) corresponding to the supporting rod (29) are formed in the inner sides of the left end and the right end of the fixing plate (30), the left supporting rod (29) and the right supporting rod (29) penetrate through the second channel holes (34) and are fixedly connected with the lifting plate (33), the second lead screw nut (32) is fixedly connected to the central position of the inner side of the lifting plate (33), the inner side of the second lead screw nut (32) is in transmission connection with a second lead screw (35), the upper end of the second lead screw (35) penetrates through the fixing plate (30) and is, the lower end of the second screw rod (35) is rotatably connected to the bottom of the forming cavity (3).

4. The metal printer using the adaptive squeegee according to claim 2 or 3, wherein: scraper blade (24) include fixed connection and are in extension plate (36) that regulating plate (22) lower extreme central point put, both ends downside fixedly connected with scrapes powder portion (37) about extension plate (36), extension plate (36) lower extreme is equipped with the contact wheel that a plurality of evenly set up, contact wheel is including controlling two fixed connection and is in backing sheet (38) of extension plate (36) lower extreme, be connected with through rotation of axes between backing sheet (38) and look for return pulley (39), open on work platform (1) have a plurality of with contact track groove (40) that the wheel corresponds.

5. The metal printer using the adaptive squeegee according to claim 2 or 3, wherein: the limiting strip (25) comprises a fixing strip (41) and a plurality of movable strips (42), the fixing strip (41) is fixedly connected to the lower end of the lifting plate (10), the movable strips (42) are located on the surface of the lifting plate (10) and are uniformly distributed on the upper ends of the fixing strip (41), third channel holes (43) corresponding to the movable strips (42) are formed in the left end and the right end of the lifting plate (10), connecting rods (44) located in the third channel holes (43) are fixedly connected to the rear ends of the movable strips (42), sliding rods (45) corresponding to the limiting strips (25) are arranged at the rear ends of the lifting plate (10), the rear ends of the connecting rods (44) are respectively fixedly connected with the sliding rods (45), slide ways (46) fixedly connected to the left end and the right end of the lifting plate (10) are arranged on the outer sides of the left end and the right end of the sliding rods (45), and lower ends of the sliding rods (45) are fixedly connected between the slide, the utility model discloses a quick-witted, including slide bar (45), slide bar (45) outside sliding connection has slider (47) in proper order, from last down loop through axis of rotation (49) between slider (47) and rotate and be connected with transfer line (48), the one end fixed connection of axis of rotation (49) is in the slider (47) outside, the other end threaded connection of axis of rotation (49) has and is located fastening nut (50) in the transfer line (48) outside.

6. The metal printer using the adaptive squeegee of claim 5, wherein: the rear end of the sealing cover (2) is provided with an adjusting opening (51) corresponding to the lifting plate (10).

7. The use method of the metal printer with the adaptive scraper according to claim 5, comprising the following steps:

a1: powder spreading height adjustment: adjusting the powder spreading height of each layer according to the metal printing height of each layer set by modeling, and pushing a sliding block (47) on a reciprocal sliding rod (45) leftwards or rightwards by unscrewing a fastening nut (50) to keep the same distance between the sliding rods (45) so as to enable the distance to be the powder spreading height;

a2: self-adaptive adjustment of the scraper: before beginning to spread the powder, elevating gear descends certain shop's powder height, when the height that descends is for the shop's powder height of settlement, screw-nut drives connecting plate (18) and regulating plate (22) and moves right or left, thereby sliding plate (26) can be smooth through the clearance between spacing (25) accomplish the shop's powder operation to shaping chamber (3) simultaneously, when the height that descends is less than the shop's powder height of settlement, screw-nut (16) drive connecting plate (18) and regulating plate (22) move right or left, contact about sliding plate (26) and spacing (25), under the effect of circular arc portion (27), thereby regulating plate (22) are through extrudeing reset spring (23) upwards sliding, thereby make scraper blade (24) of regulating plate (22) lower extreme upwards lift to the shop's powder height of settlement, thereby realize the self-adaptation regulation to shop's powder height.

Technical Field

The invention relates to the field of metal printers, in particular to a metal printer adopting a self-adaptive scraper and a using method thereof.

Background

At present, metal parts printed by a metal printer are formed by melting layer by layer, each layer is melted, a platform descends to a certain height under the action of a lifting device, new powder is fully paved and then is melted next time, and the process is repeated on the layer. The real forming principle is that laser strikes the powder bed with the energy of certain energy density for powder reaches the molten state in the region of scanning, and current metal printer especially some large-scale part's metal printer, after long-time the use, the elevating gear of platform is because long-term drive heavy object realization lift operation makes elevating gear's precision reduce, thereby leads to the unable height of moving regulation of elevating gear when carrying out metal printing, thereby influences metal printer's printing precision and printing quality.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a metal printer adopting a self-adaptive scraper, which has reasonable structural design and can automatically adapt to the lifting height of a lifting platform, thereby ensuring the powder spreading height of each layer of metal powder and ensuring the printing precision and the printing quality of the metal printer.

The invention adopts the technical scheme for solving the technical problems that: the metal printer with the self-adaptive scraper comprises a working platform, wherein a sealing cover is installed at the upper end of the working platform, a forming cavity is formed in the center of the inner side of the working platform, powder outlet cavities formed in the working platform are formed in the left end and the right end of the forming cavity, a supporting plate is connected to the inner side of the forming cavity in a sliding mode, a second supporting plate is connected to the inner side of the powder outlet cavity in a sliding mode, a lifting device is fixedly connected to the lower end of the supporting plate, a first lifting cylinder is arranged at the lower end of the second supporting plate, a laser scanner is fixedly connected to the inner side of the upper end of the sealing cover, lifting cavities formed in the front end and the rear end of the forming cavity and formed in the inner side of the working platform are arranged at the front end and the rear end of the forming cavity, a lifting plate is connected in a side sliding mode, the front end of the first connecting plate is fixedly connected with the supporting plate, the front end and the rear end of the inner side of the sealing cover are respectively provided with a lead screw and a polished rod, the left end and the right end of the lead screw and the polished rod are respectively rotatably connected to the inner side of the sealing cover, the left end of the lead screw penetrates through the sealing cover and is in transmission connection with a stepping motor arranged on the outer side of the sealing cover, the outer side of the left end of the lead screw is in transmission connection with a lead screw nut, the outer side of the polished rod is in sliding connection with a slide block corresponding to the lead screw nut, a connecting plate is fixedly connected between the slide block and the lead screw nut, a plurality of first channel holes which are uniformly arranged are formed in the inner side of the connecting plate, an adjusting rod is in sliding connection with the inner side of the first channel, the powder spreading machine is characterized in that a plurality of evenly-arranged limiting strips are arranged on the plane of the front end of the lifting plate, sliding plates corresponding to the limiting strips are arranged at the front end and the rear end of the adjusting plate, arc portions are arranged at the left end and the right end of each sliding plate, the lifting plate moving up and down along with the supporting plate is arranged, the limiting strips with the same spacing and powder spreading height are arranged on the lifting plate, the supporting plate is enabled to extrude a reset spring through the adjusting plate to enter a gap when not moving to the corresponding powder spreading position under the action of the limiting strips, a scraper at the lower end of the adjusting plate can be lifted to the specified powder spreading height under the action of the limiting strips, and therefore the high accuracy of powder spreading is guaranteed, the printing.

For further improvement, the lifting devices are lifting cylinders respectively arranged in the molding cavities.

The lifting device comprises a supporting rod, a fixing plate, a second stepping motor, a second lead screw nut and a lifting plate, wherein the supporting rod is fixedly connected to the left side and the right side of the lower end of the supporting plate, the fixing plate is fixedly connected to the center of the inner side of the forming cavity, second channel holes corresponding to the supporting rod are formed in the inner sides of the left end and the right end of the fixing plate, the supporting rod penetrates through the second channel holes and is fixedly connected with the lifting plate, the second lead screw nut is fixedly connected to the center of the inner side of the lifting plate, a second lead screw is connected to the inner side of the second lead screw nut in a transmission mode, the upper end of the second lead screw penetrates through the fixing plate and is connected with the second stepping motor installed at the upper end of the fixing.

Further perfect, the scraper blade includes fixed connection and is in the extension plate that regulating plate lower extreme central point put, both ends downside fixedly connected with scrapes powder portion about the extension plate, the extension plate lower extreme is equipped with the even contact wheel that sets up of a plurality of, two fixed connection about contact wheel is including the backing sheet of extension plate lower extreme, be connected with through rotation of axes between the backing sheet and look for the return pulley, last the opening of work platform have a plurality of with the track groove that contact wheel corresponds.

Further perfecting, the spacing strip includes the fixed strip and several movable strips, the fixed strip is fixedly connected to the lower end of the said lifting board, the said movable strip locates at the upper end of the fixed strip and distributes on the surface of the lifting board evenly, the said lifting board has third channel holes corresponding to the movable strip at the left and right ends, the said movable strip rear end is fixedly connected with the connecting rod locating in the said third channel hole, the said lifting board rear end has the slide bar corresponding to the spacing strip, the said connecting rod rear end is fixedly connected with the slide bar separately, the outside of the left and right ends of the said slide bar has the slide ways fixedly connected to the left and right ends of the lifting board, the lower end of the said slide bar is fixedly connected between the left and right said slide ways, the outside of the said slide bar has slide blocks slidably connected in turn from top to bottom, the said slide blocks are connected with the, the other end threaded connection of axis of rotation has and is located the fastening nut in the transfer line outside is equipped with a plurality of activity strip, and the activity strip can be according to the corresponding shop's powder height of printing the demand with the different demand of printing of adaptation along with the removal of the slide bar of rear end, is equipped with fastening nut, through screwing fastening nut, avoids taking place the rotation each other between the transfer line to can guarantee the rigidity of activity strip, thereby make the device can guarantee when using that every layer shop's powder height is accurate, thereby guarantee to print the precision and print the quality.

Further perfection, the rear end of the sealing cover is provided with an adjusting opening corresponding to the lifting plate.

A use method of a metal printer adopting an adaptive scraper comprises the following steps:

a1: powder spreading height adjustment: adjusting the powder spreading height of each layer according to the metal printing height of each layer set by modeling, and pushing a sliding block on a reciprocal sliding rod leftwards or rightwards by unscrewing a fastening nut to keep the same distance between the sliding rods, wherein the distance is the powder spreading height;

a2: self-adaptive adjustment of the scraper: before the powder begins to spread, elevating gear descends certain shop's powder height, when the height that descends is for the shop's powder height of settlement, screw-nut drives connecting plate and regulating plate right or left movement, thereby the sliding plate can be smooth through the clearance between the spacing to accomplish the shop's powder operation to the shaping chamber, when the height that descends is less than the shop's powder height of settlement, screw-nut drives connecting plate and regulating plate right or left movement, the sliding plate contacts about with spacing, under the effect of circular arc portion, thereby the regulating plate upwards slides through extrusion reset spring, thereby make the scraper blade of regulating plate lower extreme upwards lift to the shop's powder height of settlement, thereby realize the self-adaptation regulation to shop's powder height.

The invention has the beneficial effects that: the lifting plate is driven by the lifting device to slide up and down in the lifting cavity, and the height of the scraper at the lower end of the adjusting plate is adjusted by the position of the limiting strip on the lifting plate, so that the scraper can automatically adapt to the lifting height of the lifting platform, and when the lifting device cannot lift to a specified height, the height of the scraper is automatically adjusted by the self-adaptive adjusting plate, so that the powder spreading height of each layer of metal powder is ensured, and the printing precision and the printing quality of the metal printer are ensured.

Drawings

FIG. 1 is a schematic structural view of a lifting device of the present invention as a lifting cylinder;

FIG. 2 is a schematic structural view of a lifting device of the present invention being a screw rod;

FIG. 3 is a top view of the present invention;

FIG. 4 is a schematic structural view of the lifter plate;

FIG. 5 is a rear view of the lifter plate;

FIG. 6 is a right side view of the lifter plate;

FIG. 7 is a schematic view of the mounting of the connecting plate and the adjustment plate;

FIG. 8 is a front view of the connecting plate and the adjustment plate;

fig. 9 is an enlarged view of a portion a in fig. 8.

Description of reference numerals: 1. working platform, 2, sealing cover, 3, forming cavity, 4, powder outlet cavity, 5, support plate, 6, second support plate, 7, first lifting cylinder, 8, laser scanner, 9, lifting cavity, 10, lifting plate, 11, connecting channel, 12, first connecting plate, 13, screw rod, 14, polished rod, 15, stepping motor, 16, screw nut, 17, slider, 18, connecting plate, 19, first channel hole, 20, adjusting rod, 21, limiting boss, 22, adjusting plate, 23, reset spring, 24, scraping plate, 25, limiting strip, 26, sliding plate, 27, arc part, 28, lifting cylinder, 29, support rod, 30, fixing plate, 31, second step, 32, second screw nut, 33, lifting plate, 34, second channel hole, 35, second screw rod, 36, extension plate, 37, powder scraping part, 38, support plate, 39, bottom finding wheel, 40, powder outlet cavity, 37, powder scraping part, 38, support plate, 39, bottom finding wheel, 40, and powder outlet cavity, Track groove, 41, fixed bar, 42, movable bar, 43, third channel hole, 44, connecting rod, 45, sliding rod, 46, slideway, 47, sliding block, 48, driving rod, 49, rotating shaft, 50, fastening nut, 51 and adjusting opening.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

example 1:

a metal printer adopting a self-adaptive scraper comprises a working platform 1, a sealing cover 2 is installed at the upper end of the working platform 1, a molding cavity 3 is arranged at the center position of the inner side of the working platform 1, a powder outlet cavity 4 which is arranged on the working platform 1 is arranged at the left end and the right end of the molding cavity 3, a supporting plate 5 is connected to the inner side of the molding cavity 3 in a sliding manner, a second supporting plate 6 is connected to the inner side of the powder outlet cavity 4 in a sliding manner, a lifting device is fixedly connected to the lower end of the supporting plate 5, a first lifting cylinder 7 is arranged at the lower end of the second supporting plate 6, a laser scanner 8 is fixedly connected to the inner side of the upper end of the sealing cover 2, a lifting cavity 9 which is arranged at the inner side of the working platform 1 is arranged at the front end and the rear end of the molding cavity 3, a lifting plate 10 is connected to the inner side, the lower end of the lifting plate 10 is fixedly connected with a first connecting plate 12 positioned in a connecting channel 11, the front end of the first connecting plate 12 is fixedly connected with a supporting plate 5, the front end and the rear end of the inner side of the sealing cover 2 are respectively provided with a screw rod 13 and a polished rod 14, the left end and the right end of the screw rod 13 and the polished rod 14 are respectively rotatably connected with the inner side of the sealing cover 2, the left end of the screw rod 13 penetrates through the sealing cover 2 and is in transmission connection with a stepping motor 15 arranged on the outer side of the sealing cover 2, the outer side of the left end of the screw rod 13 is in transmission connection with a screw rod nut 16, the outer side of the polished rod 14 is in sliding connection with a slide block 17 corresponding to the screw rod nut 16, a connecting plate 18 is fixedly connected between the slide block 17 and the screw rod nut 16, the inner side of the connecting plate 18 is provided, the lower end of the adjusting rod 20 is fixedly connected with an adjusting plate 22, a reset spring 23 located between the connecting plate 18 and the adjusting plate 20 is arranged on the outer side of the adjusting rod 20, a scraping plate 24 is fixedly connected with the lower end of the adjusting plate 22, a plurality of limiting strips 25 which are uniformly arranged are arranged on the plane of the front end of the lifting plate 10, sliding plates 26 corresponding to the limiting strips 25 are arranged at the front end and the rear end of the adjusting plate 22, and arc portions 27 are arranged at the left end and the right end of each sliding plate 26.

Elevating gear is for installing lift cylinder 28 in shaping chamber 3 respectively, and scraper blade 24 includes fixed connection and is in the extension plate 36 that adjusting plate 22 lower extreme central point put, both ends downside fixedly connected with scrapes powder portion 37 about extension plate 36, extension plate 36 lower extreme is equipped with the contact wheel that a plurality of evenly set up, two fixed connection about contact wheel is including support sheet 38 of extension plate 36 lower extreme, be connected with through rotation of axes between support sheet 38 and look for return pulley 39, work platform 1 is last to open have a plurality of with contact the track groove 40 that the wheel corresponds.

The limiting strip 25 comprises a fixed strip 41 and a plurality of movable strips 42, the fixed strip 41 is fixedly connected to the lower end of the lifting plate 10, the movable strips 42 are located on the upper end of the fixed strip 41 and are uniformly distributed on the surface of the lifting plate 10, third channel holes 43 corresponding to the movable strips 42 are formed in the left end and the right end of the lifting plate 10, the rear end of each movable strip 42 is fixedly connected with a connecting rod 44 located in the corresponding third channel hole 43, the rear end of the lifting plate 10 is provided with a sliding rod 45 corresponding to the limiting strip 25, the rear end of each connecting rod 44 is respectively fixedly connected with the corresponding sliding rod 45, the outer sides of the left end and the right end of each sliding rod 45 are provided with sliding ways 46 fixedly connected to the left end and the right end of the lifting plate 10, the sliding rod 45 is fixedly connected between the left sliding way and the right sliding way 46, the outer sides of the sliding rods 45 are sequentially, one end of the rotating shaft 49 is fixedly connected to the outer side of the sliding block 47, the other end of the rotating shaft 49 is in threaded connection with a fastening nut 50 located on the outer side of the transmission rod 48, and the rear end of the sealing cover 2 is provided with an adjusting opening 51 corresponding to the lifting plate 10.

Example 2:

a metal printer adopting a self-adaptive scraper comprises a working platform 1, a sealing cover 2 is installed at the upper end of the working platform 1, a molding cavity 3 is arranged at the center position of the inner side of the working platform 1, a powder outlet cavity 4 which is arranged on the working platform 1 is arranged at the left end and the right end of the molding cavity 3, a supporting plate 5 is connected to the inner side of the molding cavity 3 in a sliding manner, a second supporting plate 6 is connected to the inner side of the powder outlet cavity 4 in a sliding manner, a lifting device is fixedly connected to the lower end of the supporting plate 5, a first lifting cylinder 7 is arranged at the lower end of the second supporting plate 6, a laser scanner 8 is fixedly connected to the inner side of the upper end of the sealing cover 2, a lifting cavity 9 which is arranged at the inner side of the working platform 1 is arranged at the front end and the rear end of the molding cavity 3, a lifting plate 10 is connected to the inner side, the lower end of the lifting plate 10 is fixedly connected with a first connecting plate 12 positioned in a connecting channel 11, the front end of the first connecting plate 12 is fixedly connected with a supporting plate 5, the front end and the rear end of the inner side of the sealing cover 2 are respectively provided with a screw rod 13 and a polished rod 14, the left end and the right end of the screw rod 13 and the polished rod 14 are respectively rotatably connected with the inner side of the sealing cover 2, the left end of the screw rod 13 penetrates through the sealing cover 2 and is in transmission connection with a stepping motor 15 arranged on the outer side of the sealing cover 2, the outer side of the left end of the screw rod 13 is in transmission connection with a screw rod nut 16, the outer side of the polished rod 14 is in sliding connection with a slide block 17 corresponding to the screw rod nut 16, a connecting plate 18 is fixedly connected between the slide block 17 and the screw rod nut 16, the inner side of the connecting plate 18 is provided, the lower end of the adjusting rod 20 is fixedly connected with an adjusting plate 22, a reset spring 23 located between the connecting plate 18 and the adjusting plate 20 is arranged on the outer side of the adjusting rod 20, a scraping plate 24 is fixedly connected with the lower end of the adjusting plate 22, a plurality of limiting strips 25 which are uniformly arranged are arranged on the plane of the front end of the lifting plate 10, sliding plates 26 corresponding to the limiting strips 25 are arranged at the front end and the rear end of the adjusting plate 22, and arc portions 27 are arranged at the left end and the right end of each sliding plate 26.

The lifting device comprises a supporting rod 29, a fixing plate 30, a second stepping motor 31, a second lead screw nut 32 and a lifting plate 33, the supporting rods 29 are fixedly connected with the left side and the right side of the lower end of the supporting plate 5, the fixing plate 30 is fixedly connected with the central position of the inner side of the forming cavity 3, the inner sides of the left and right ends of the fixing plate 30 are provided with second channel holes 34 corresponding to the support rods 29, the left and right support rods 29 penetrate through the second channel holes 34 and are fixedly connected with lifting plates 33, the second lead screw nut 32 is fixedly connected at the central position of the inner side of the lifting plate 33, the inner side of the second lead screw nut 32 is connected with a second lead screw 35 in a transmission way, the upper end of the second screw rod 35 penetrates through the fixing plate 30 to be connected with a second stepping motor 31 installed at the upper end of the fixing plate 30 in a transmission mode, and the lower end of the second screw rod 35 is rotatably connected to the bottom of the forming cavity 3.

The limiting strip 25 comprises a fixed strip 41 and a plurality of movable strips 42, the fixed strip 41 is fixedly connected to the lower end of the lifting plate 10, the movable strips 42 are located on the upper end of the fixed strip 41 and are uniformly distributed on the surface of the lifting plate 10, third channel holes 43 corresponding to the movable strips 42 are formed in the left end and the right end of the lifting plate 10, the rear end of each movable strip 42 is fixedly connected with a connecting rod 44 located in the corresponding third channel hole 43, the rear end of the lifting plate 10 is provided with a sliding rod 45 corresponding to the limiting strip 25, the rear end of each connecting rod 44 is respectively fixedly connected with the corresponding sliding rod 45, the outer sides of the left end and the right end of each sliding rod 45 are provided with sliding ways 46 fixedly connected to the left end and the right end of the lifting plate 10, the sliding rod 45 is fixedly connected between the left sliding way and the right sliding way 46, the outer sides of the sliding rods 45 are sequentially, one end of the rotating shaft 49 is fixedly connected to the outer side of the sliding block 47, and the other end of the rotating shaft 49 is in threaded connection with a fastening nut 50 located on the outer side of the transmission rod 48.

The method of use of the above examples 1 and 2, comprising the steps of:

a1: powder spreading height adjustment: adjusting the powder spreading height of each layer according to the metal printing height of each layer set by modeling, and pushing the sliding block 47 on the reciprocal sliding rod 45 leftwards or rightwards by unscrewing the fastening nut 50 to keep the same distance between the sliding rods 45, so that the distance is the powder spreading height;

a2: self-adaptive adjustment of the scraper: before the powder begins to spread, elevating gear descends certain shop's powder height, when the height that descends is for the shop's powder height of settlement, screw-nut drives connecting plate 18 and regulating plate 22 and moves right or left, thereby the smooth powder operation of shop to shaping chamber 3 of passing through the clearance between spacing 25 that passes through of sliding plate 26 simultaneously, when the height that descends is less than the shop's powder height of settlement, screw-nut 16 drives connecting plate 18 and regulating plate 22 and moves right or left, sliding plate 26 and spacing 25 contact about, under the effect of circular arc portion 27, thereby regulating plate 22 upwards slides through extrusion reset spring 23, thereby make the scraper blade 24 of regulating plate 22 lower extreme upwards lift up to the shop's powder height of settlement, thereby realize the self-adaptation regulation to shop's powder height.

While the invention has been shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.