[0032] figure 1 Is a schematic diagram of the three-dimensional structure of the present invention; figure 2 Is a schematic diagram of the structure of the present invention; image 3 Is a schematic cross-sectional structure diagram of the present invention; Figure 4 for image 3 Schematic diagram of the enlarged structure of point A; Figure 5 Schematic diagram of the structure of the powder supply roller driving device; Image 6 Schematic diagram of the enlarged structure of the boss; Figure 7 Schematic diagram of the structure of the scraper mounting seat; Figure 8 Schematic diagram of the runner lining structure; Picture 9 Schematic diagram of the structure of the powder supply roller mounting seat; Picture 10 Schematic diagram of the powder supply roller structure; Picture 11 Schematic diagram of the toner supply box structure;
[0033] In this embodiment, the left, right, front and back directions are figure 2 Corresponding to the direction, that is, facing figure 2 The left side of the product shown is the left direction in this embodiment, facing figure 2 The right side of the product shown is the right direction in this embodiment.
[0034] As shown in the figure: The additive manufacturing bidirectional quantitative powder spreading device of this embodiment includes a worktable, a powder spreading mechanism that can be reciprocated and linearly slid left and right on the worktable, and is installed on the worktable to drive the powder spreading mechanism to slide And two powder supply devices installed on the worktable and located on the sliding path of the powder spreading mechanism for supplying powder to the powder spreading mechanism, and the powder spreading mechanism includes a scraper that drives reciprocatingly through the first drive device Mounting seat 1, scraper 2 installed at the bottom of the scraper mounting seat, and two powder spreading channels 3 provided on the scraper mounting seat and located on the left and right sides of the scraper. The bottom of the powder supply device is provided with a powder supply groove 8a, two The powder spreading channels are respectively used for receiving the powder falling from two powder supply tanks to realize the two-way powder spreading of the powder spreading mechanism;
[0035] The workbench in this embodiment is not limited to the traditional open platform. The preferred workbench in this embodiment is the work cabin 16, which has a hollow rectangular parallelepiped structure, the powder spreading mechanism, the first drive structure, and the powder supply device. It is set in the inner cavity of the working cabin, and the side wall of the working cabin is provided with operating windows. Of course, the specific structure of the working cabin is not limited to the rectangular parallelepiped structure. It can be adjusted according to the printed products and the settings of internal parts. I will not repeat them here. The top of the working cabin is provided with a light hole 17 for the laser to pass through. The bottom of the working cabin is facing the light hole and connected with a downwardly extending forming channel. A forming table 18 is provided in the forming channel. The table can be raised and lowered in the forming channel. The specific lifting mode can be realized by linear motors, hydraulic cylinders or other structures, which will not be repeated here. Two powder supply devices are arranged on the left and right sides of the forming table 18. The first drive The device adopts the first motor 19, the first motor is in cooperation with the ball screw 20, the ball screw is threadedly connected with the slider, the slider protrudes on the back of the connecting plate 21, and the back of the scraper mounting seat is fixedly connected to the front side of the connecting plate. The cooperation of the motor and the ball screw realizes the precise driving of the powder spreading mechanism. There are two bearing seats on the side wall of the working cabin. The two ends of the ball screw are installed on the bearings in the bearing seat. This structure makes the screw and the The working cabin rotates and cooperates to improve the stability of the ball screw. The bottom of the scraper mounting seat is provided with a T-shaped installation groove, and the top of the scraper is provided with a T-shaped installation boss. The T-shaped installation boss is set in the T-shaped installation groove to realize the scraper This structure facilitates the installation and disassembly of the scraper, and is convenient for maintenance and repair. The bottom of the scraper is provided with chamfers on both sides along the sliding direction of the scraper. During the scraper sliding and scraping process, the chamfer exerts downward pressure on the powder, and The downward pressure can be adjusted by the angle of the chamfer, thereby adjusting the compactness of the powder and improving the powder laying effect; the scraper mounting seat has an upward slope from the outside to the inside, through which the side of the scraper mounting seat can form a triangular structure or A right-angled trapezoidal structure is formed. The scraper mounting base 1 is mounted on the connecting plate 21 to form a triangular cantilever structure, which improves the stability of the scraper mounting base. Of course, the scraper mounting base is not limited to this cantilever structure. When used in large-scale additive manufacturing equipment , Due to the larger structure of the scraper mounting seat, guide rails can be set on both sides of the scraper mounting seat to form an overhead structure. The drive device drives the scraper mounting seat to run on two guide rails. When the scraper mounting seat has a large structure, other The form of the arrangement improves the stability of the scraper mounting seat, which will not be repeated here; the side of the scraper mounting seat is provided with a meat-removing groove 22, which has a triangular cross-sectional structure. This structure ensures that the whole scraper mounting seat is Under the premise of structural strength, the weight of the scraper mounting seat is reduced, the material of the scraper mounting seat is reduced, and the cost is saved. Two powder spreading channels 3 penetrate from the inclined surface of the scraper mounting seat to the bottom, and the scraper is installed through this inclined surface. The seat and the powder supply device can form a good match, that is, the powder supply tank 8a and the powder spreading flow channel form a good connection, forming a closed flow channel, which can effectively reduce dust and improve powder spreading Effect. At the same time, the two powder spreading channels divide the scraper mounting seat into three parts, namely, the two parts located outside the two powder spreading channels and the part located in the middle of the two powder spreading channels. The three-part structure is in the vertical direction. Play the role of reinforcing ribs. Because the flow channel lining is vertically matched with the powder supply plate, the scraper mounting seat will receive a vertical force. This rib structure increases the strength of the scraper mounting seat in the vertical direction to prevent The scraper mounting seat deforms when subjected to a vertical force to avoid the deformation of the runner lining and the powder spreading flow path due to the deformation of the scraper mounting seat, which improves the stability and powder spreading effect. At the same time, the scraper mounting seat is The scraper provides a stable support to prevent the scraper from being deformed by force and affecting the scraping effect;
[0036] In use, by controlling the start and stop of the first motor 19, the sliding stroke of the scraper mounting seat can be precisely controlled. When the scraper mounting seat spreads powder from left to right, the powder spreading channel on the right side of the scraper performs powder spreading operation. The scraper located on the rear side of the sliding direction performs the scraping operation. When it is laid to the rightmost side, the powder stored in the powder supply channel just falls out. At this time, the powder flow channel on the left side of the scraper and the powder supply of the powder supply device on the right The grooves are docked, and the powder feeding device on the right side realizes the powder feeding operation on the powder spreading channel located on the left side of the scraper. Part of the powder flows to the bottom of the working cabin to form accumulation and the bottom of the powder spreading channel is blocked, making the powder stored in the powder spread In the flow channel, the position of powder accumulation is preferably set at the side of the forming channel to avoid the influence of powder accumulation on the powder laying on the forming table. When the scraper mounting seat slides from right to left, the powder spreading channel on the left is used for spreading operation At the same time, the scraper located on the back side of the sliding direction performs the scraping operation. When the powder is laid to the leftmost side, the powder stored in the powder supply channel just falls out. At this time, the powder flow channel on the right side of the scraper and the left powder supply device The powder supply tank is docked, and the powder supply device on the left side realizes the powder spreading flow channel on the right side of the scraper, and then the scraper mounting seat continues to realize the powder spreading operation from left to right, and proceed to the next powder spreading process. During the powdering process, it is always ensured that the powder spreading operation is performed in the powder spreading channel on the front side of the sliding direction of the scraper mounting seat, and the scraper is located on the rear side for the powder scraping operation. This is obvious to those skilled in the art and will not be repeated in detail; The powder spreading process realizes two-way powder spreading operation, which avoids empty strokes and improves powder spreading efficiency. At the same time, the powder spreading channel is integrated on the scraper mounting seat, and no switching device is required to realize the two-way powder spreading operation. This structure simplifies the two-way powder spreading The structure of the powder spreading and powder spreading device is integrated to improve the stability of powder spreading and powder spreading. The two interact to improve the powder spreading effect; the powder spreading channel temporarily accepts the powder during the moving process. This structure can It is convenient to selectively supply powder in the powder spreading flow channel, and the powder supply operation to different powder spreading channels can be realized by the stroke control of the first motor on the scraper mounting seat. This structure does not need to set the switching device of the powder spreading flow channel. In addition, the powder is supplied in the powder flow channel before powder spreading, so that the extrusion state of the powder in the powder flow channel is always kept constant, and the laid powder layer is always thin and uniform, which improves the powder spread quality.
[0037] In this embodiment, the powder spreading flow channel is provided with a flow channel lining 9 slidably along its penetrating direction, and a pressing device that cooperates with the flow channel lining is provided on the workbench. After docking with the powder supply tank 8a, the pressing device is pressed against the inner liner of the flow channel so that the liner of the flow channel slides upwards and forms a closed flow channel with the powder supply tank; the powder spreading flow channel is set in a trough structure, similar to The elongated waist-shaped hole structure, the runner lining is a thin-walled annular structure that matches the powder spreading runner. At this time, when the powder supply device supplies powder, the powder is stored in the runner lining, and the runner lining and the powder supply After the groove 8a is docked, the substrate part in the flow channel is pressed by the pressing device to slide upward, and the substrate part in the flow channel abuts against the bottom of the powder supply device to form a closed flow channel between the flow channel lining and the powder supply tank. The tightening device can be a hydraulic mechanism set at the bottom of the working cabin. In normal conditions, the output end of the hydraulic mechanism retracts into the bottom of the working cabin to avoid interference between the output end of the hydraulic mechanism and the scraper and other components. When the scraper mounting seat is positioned so that the flow After the channel lining is docked with the powder supply tank 8a, the hydraulic structure moves its output end up to move against the inner liner of the flow channel to realize the upward movement of the flow channel lining. Of course, the pressing device is not limited to the hydraulic system, which can be passed through a spring Other structural forms such as parts, motors, etc. provide compaction power, which will not be repeated here; this structure can effectively avoid powder dust caused by the intermediate gap, effectively avoiding dust blocking the laser and affecting the sintering or melting effect, and also avoiding the effect of dust The powder spreading effect also reduces the dust pollution caused by the dust on the inside and outside of the working cabin, improves the sintering quality and powder spreading effect, and improves the working environment inside and outside the working cabin.
[0038] In this embodiment, the powder supply device includes a powder supply box 4 fixed on the workbench for storing powder, connected to the bottom of the powder supply box and penetrated with the inner cavity of the powder supply box for quantitative supply of the powder flow channel A quantitative powder supply mechanism for powder. The bottom of the quantitative powder supply mechanism is provided with a powder dropping groove 5a for powder dropping; this powder dropping groove 5a can be directly used as a powder supply groove 8a, of course. image 3 As shown, the powder supply tank is opened on the powder supply plate and located below the powder drop tank. The two pass through to form a closed flow channel. The powder supply box and the quantitative powder supply mechanism are detachably connected. Of course, the powder supply box can be integrated into the quantitative powder supply. On the mechanism, the two are integrally formed. The detachable connection method is preferred in this embodiment to facilitate the disassembly and maintenance of the powder supply box and the quantitative powder supply mechanism. At least one side wall of the powder supply box is inclined downward to form a guide wall 29 so that the supply The bottom of the powder box shrinks downward, and the guide wall is parallel to the length of the receiving groove. The guide wall extends downward to the side of the receiving groove. The guide wall guides the flow of the powder and avoids the retention of the powder. The powder supply box passes the powder through the quantitative supply The powder dropping tank of the powder mechanism is supplied into the powder supply tank. The quantitative powder supply mechanism can accurately supply the powder in the powder spreading channel. It can be accurately matched with the powder outflow speed of the powder spreading channel and the sliding speed and sliding distance of the scraper mounting seat. The powder laying area is controlled. When the scraper mounting seat slides to the end, the internal powder can be guaranteed to fall off, avoid ineffective powder spreading operations, improve the utilization rate of powder, reduce the powder that needs to be recycled, and improve the spreading efficiency.
[0039] There is a horizontally extending mounting plate 30 at the bottom of the toner supply box, and a triangular area is formed between the mounting plate and the guide wall on the outside of the toner supply box; The two are connected as a whole rib 31, such as Picture 11 The powder supply box shown is provided with a guide wall, so that the side of the powder supply box has a trapezoidal structure, the installation stability of the powder supply box is improved by installing a mounting plate, and the overall strength of the powder supply box is increased by adding reinforcing ribs.
[0040] In this embodiment, the top and bottom edges of the flow channel lining are provided with limiting flanges 10 extending outward to limit the flow channel lining to the powder flow channel, and the pressing device is set on the workbench The upper part is respectively located below the two powder tanks 8a and is respectively matched with the two bosses 11 for the two runner linings. The opposite sides of the two bosses have inclined surfaces extending outward along the center of the two. Or curved surface, the inclined surface or curved surface is used to contact the limit flange under the corresponding runner lining and make the runner lining slide and press on the powder supply device; the upper and lower limit flanges and the runner lining To form an I-shaped structure, the width of the limit flange should be greater than the width of the powder flow channel or the length of the limit flange should be greater than the length of the powder flow channel, so as to limit the flow channel lining to the powder flow channel. Purpose, the height of the runner lining should be slightly higher than the height of the powder spreading runner, so that the runner lining can slide up and down in the powder spreading runner, and the upper limit flange can increase and press on the bottom of the powder supply device. The joint surface makes the two closely fit and improves the sealing effect of the two. The upper limit flange can be set to elastic material, such as rubber material. During the upward movement of the runner lining, the upper limit flange of rubber material is squeezed Deformed at the bottom of the powder supply device, so that a closed flow channel is formed between the flow channel lining and the powder supply tank. The boss can be set as a wedge block or a semicircular structure, of course, it can also be set in other special shapes. The structure, which will not be repeated here, is preferably a semicircular boss structure in this embodiment, such as Image 6 As shown, when the squeegee mounting seat moves to the leftmost side, the boss 11 gradually raises the limit flange of the inner substrate part of the runner on the right side of the squeegee through the outer arc surface, and the upper limit flange is pressed against the powder supply At the bottom of the device, a closed flow channel is formed between the runner lining and the powder supply tank. When the boss is separated from the limit flange, the runner lining will automatically slide down and reset by its own weight, and is installed with a scraper through a simple boss structure The sliding stroke of the seat realizes the closure between the runner lining and the powder supply tank. This structure is simple and easy to operate. It can realize the sliding of the runner lining without setting a special power device.
[0041] In this embodiment, the limiting flanges of the substrate portion in the two flow channels respectively extend along the front and rear sides of the scraper and extend beyond the front and rear ends of the scraper and the scraper mounting seat, and two bosses are separately provided at the front and back of the scraper and the scraper mounting seat. Side and used in conjunction with the limit flanges of the substrate part in the two runners; Image 6 As shown, the flow channel lining on the right side of the scraper, the limit flange at the bottom extends forward to the front side of the front end of the scraper and the scraper mounting seat, and the boss on the left side of the forming table is set on the scraper and the scraper installation The front side of the front face of the seat, also for the runner lining on the left side of the scraper, the bottom limit flange extends backwards to the rear side of the rear face of the scraper and the scraper mounting seat, and the boss is located on the right side of the forming table On the back side of the rear surface of the scraper and the scraper mounting seat, a space is provided through this structure, the scraper mounting seat and the scraper do not interfere with the boss during the sliding process, and the boss does not cross the flow channel of the runner lining , Does not interfere with the laying of powder.
[0042] In this embodiment, the opposite sides of the two bosses 11 have arc-shaped curved surfaces; they are arranged as arc-shaped curved surfaces. When the limit flange of the substrate portion in the flow channel moves upward against the curved surface, the flow The speed at which the liner moves up is curved. By controlling the bending radius of the curved surface, the initial speed and the end speed of the liner moving up are controlled. In this embodiment, it is preferable to move the bottom of the two bosses to their highest point. Set to a 1/4 arc surface, the tangent of the curved surface at the highest point of the boss is level; this structure makes the runner lining move upward along the curved surface of the boss, the initial speed is relatively large, and when it moves to the highest point, the speed tends to zero. Make the limit flange on the top of the runner lining and the bottom of the powder supply device lightly fit, the force is even, and the sealing effect of the two is improved, and the rigid collision caused by the excessive speed is avoided. During multiple uses, It can ensure the sealing effect of the two and increase the use times of the runner lining. In order to facilitate the manufacture of the boss, the boss is arranged in a semicircular structure in this embodiment, and the radial flat end is attached to the bottom of the working cabin. .
[0043] In this embodiment, the quantitative powder supply mechanism includes a powder supply roller mounting seat 5, a powder supply roller 6 and a second driving device that drives the powder supply roller to rotate around its own axis. The mounting seat is connected to the bottom of the powder supply box, the powder supply roller mounting seat is provided with a cylindrical powder supply cavity 7, and the diameter of the powder supply roller matches the diameter of the powder supply cavity and is rotatably installed in the powder supply In the cavity, the powder supply roller mounting seat is provided with a receiving groove 5b that allows the inner cavity of the powder supply box to pass through the powder supply cavity. The powder drop groove 5a is opened below the powder supply roller mounting seat. The circumferential surface of the roller is evenly distributed with quantitative powder supply grooves 6a extending in the axial direction; when the powder supply roller mounting seat and the powder supply box are integrally formed, the receiving groove 5b directly penetrates from the top of the powder supply cavity to the bottom of the powder supply box, When the two are installed in a detachable manner, the receiving groove adopts a two-stage structure, that is, receiving grooves are provided above the powder supply cavity and the bottom of the powder supply box. The two receiving grooves are connected to form a closed flow channel, the receiving groove and the drop The powder trough extends along the axial direction of the powder supply cavity. The powder drop slot and the receiving groove are respectively opened at the top and bottom of the powder supply cavity, so that the powder drop groove is located directly below the receiving groove, and the radial section of the quantitative powder supply slot can be It is a semicircular, rectangular or other polygonal structure. The powder supply roller and the powder supply cavity adopt a clearance fit. The gap value is adjustable according to the size of the powder particles. When the powder supply roller rotates, the quantitative powder supply slot 6a above it When it is docked with the receiving groove 5b, the powder flows into the quantitative powder supply tank. When the quantitative powder supply groove is docked with the powder drop groove, the powder flows into the powder drop groove to achieve precise powder flow control and the rotation of the powder supply roller It can achieve the effect of actively extracting powder and avoid the phenomenon of poor flow caused by long-term accumulation of powder in the powder supply box, such as Picture 9 with Picture 10 As shown, the two ends of the powder supply cavity have mounting holes with a diameter larger than the inner diameter of the powder supply cavity. This mounting hole is used as a bearing seat for the two ends of the powder roller to rotate and fit into the bearing seat through the bearing 28, and the powder roller can pass through The external third motor is directly connected to drive, such as Figure 5 As shown, each quantitative powder supply mechanism in this embodiment is equipped with a second driving device. The second driving device includes a third motor 23, a driving pulley 24, a driven pulley 25, a belt 26, and a driving pulley 24 and The third motor is matched with the transmission, the powder supply roller is matched with the driven pulley 25, the driving pulley and the driven pulley are driven by the belt 26, and each quantitative powder supply mechanism is equipped with a drive system to facilitate quantitative powder supply The independent control of the mechanism, of course, the driving of the powder supply roller is not limited to this structure, and the control of the two powder supply rollers can also be realized through the reducer and the shift fork, which will not be repeated here.
[0044] In this embodiment, the second driving device includes a driving part installed on the workbench to provide power and an intermediate transmission part that is driven by the driving part and transmits the power to the powder supply roller. The part is provided with a polygonal transmission protrusion 6b for mating with the intermediate transmission member, and the intermediate transmission member is provided with a transmission hole adapted to the polygonal transmission protrusion, and the polygon transmission protrusion 6b is located in the transmission hole; It is the third motor, and the intermediate transmission parts are the driving pulley, the driven pulley and the belt. Of course, the intermediate transmission may be a single wheel directly connected to the output shaft of the third motor, and the details are not repeated here; The roller mounting seat is detachably connected to the inner wall of the working cabin. The driven pulley is provided with a transmission hole at the end. The driven pulley transmits the rotational movement to the powder supply roller through the cooperation of the transmission hole and the polygonal transmission protrusion. The blocks can be rectangular bumps, triangles, pentagons, or hexagons. The polygonal transmission bumps are not limited to the traditional polygonal structure. They can also be splined, gear-shaped and other polygonal structures, which will not be repeated here. The driven pulley can be a single structure, that is, a wheel body structure. One end of the wheel body is provided with a mounting hole for matching with the drive shaft, and the other end is provided with a transmission hole. The driven pulley can also be a duplex structure, that is, There are two wheel body structures in the axial direction. One wheel body is matched with the drive shaft, and the other wheel body is matched with the polygonal transmission bump. The details will not be repeated. When the powder is spread for different types of powder, the quantitative The powder supply mechanism and the powder supply box are removed, the new quantitative powder supply mechanism and the powder supply box are installed in place, and the polygonal transmission bump at the end of the replaced powder supply roller matches the transmission hole, and the powder supply roller mounting seat Fixed in the working chamber by screws, this structure facilitates the disassembly and replacement of the quantitative powder supply mechanism and the powder supply box as an integral part, which improves the continuous working ability of the device. When the powder needs to be replaced, the quantitative powder supply is directly replaced. The mechanism and the toner supply box are sufficient, which can avoid work interruption caused by disassembly and cleaning of the original equipment.
[0045] In this embodiment, the powder supply device further includes a powder supply plate 8 which is vertically extended and connected to the bottom of the powder supply roller mounting seat and covers the bottom end of the powder drop groove. The powder supply groove 8a It is vertically arranged on the powder supply plate 8 and penetrates the powder drop groove 5a; through the powder supply plate, the distance between the powder supply roller mounting seat and the scraper mounting seat can be increased, which facilitates the arrangement of various parts and components. The powder supply plate is set so that the bottom of the powder supply tank and the top of the powder flow channel are as close as possible to each other. After the powder supply roller mounting seat and the scraper mounting seat are butted, the powder supply tank and the powder flow channel are closed. The dust generated by the falling powder is controlled in the closed runner, which reduces the pollution of the dust to the environment and the impact on the quality of spreading powder, and improves the quality of spreading powder.
[0046] In this embodiment, the bottom of the powder supply box 4 is provided with a downwardly recessed powder drop portion 4a with an arc-shaped radial cross section, and the receiving groove 5b is opened at the bottom of the powder drop portion and extends in the axial direction. The powder box 4 is provided with a rotating shaft 13 coaxially with the powder dropping part. The rotating shaft is connected with an opening and closing door 14 for opening or closing the receiving groove. The opening and closing door is attached to the inner surface of the powder dropping part and is connected with the powder dropping part. The inner side of the powder part matches; such as Figure 4 As shown, the powder drop part is elongated and extends along the axial direction of the powder supply roller. The powder drop part is located at the lowest part of the powder supply box. The side wall of the powder supply box extends downward to the edge of the powder drop part, passing through the side The guide of the wall makes the powder flow into the powder falling part, and always ensure that the powder falling part is full of powder. When the powder is extracted with the powder supply roller, the amount of powder extracted by each quantitative powder supply tank is maintained within a small error range, avoiding the powder Poor flow leads to excessive deviation of the amount of powder extracted in each quantitative powder supply tank, which improves the accuracy of powder supply; the opening and closing door is a semi-circular ring structure, and the outer diameter of the opening and closing door is the same as the inner diameter of the powder dropping part. The door is connected to the rotating shaft through a fan-shaped connecting rod transmission. When the rotating shaft rotates, the opening and closing door fits and slides on the inner side of the powder dropping part. The opening and closing door can be made of elastic material or metal material, depending on the material of the opening and closing door. The opening and closing door and the powder falling part can be matched by clearance fit or transitional fit. When the opening and closing door is made of metal, the clearance fit can be used to avoid excessive friction between the two. When using rubber and other elasticity When the material is large, the method of transitional fit can be adopted. The opening and closing door of this structure can push the powder to one side during the opening or closing process, which facilitates the opening and closing of the opening and closing door, and the powder will not cause the opening and closing door to jam The dead phenomenon improves the operating reliability of the opening and closing door, and reduces the influence of powder on the opening and closing of the opening and closing door.
[0047] In this embodiment, the workbench is provided with two recovery grooves 12 on the path of the powder spreading mechanism, and the two recovery grooves are arranged on the left and right sides of the powder spreading area; the recovery grooves are arranged on two powder supply grooves 8a. On the side and outside of the two bumps, a recycling box can be set at the bottom of the working cabin. The inner cavity of the recycling box is connected to the inner cavity of the working cabin through the recycling groove. The scraper pushes the excess powder to the recycling groove, and the powder falls through the recycling groove. To the recycling box, convenient for powder recycling.
[0048] In this embodiment, the workbench is fixedly connected with a guide rail 15 which is used in conjunction with the scraper mounting seat to guide it, such as Figure 5 As shown, the guide rail, the first motor and the ball screw are fixedly connected to the back plate 27, and the back plate is fixed on the inner side wall of the working cabin. In order to improve the operation stability of the scraper mounting seat, two upper and lower back plates are arranged on the front side of the back plate. The track, the ball screw is set between the two tracks, the back of the connecting plate is provided with a track groove that matches the track, the track and the track groove can be set in a dovetail shape to achieve single-degree-of-freedom linear sliding between the two For other structural forms, single-degree-of-freedom linear sliding is realized, which will not be repeated here.
[0049] In this embodiment, the axial direction of the powder feeding cavity is perpendicular to the sliding direction of the powder spreading mechanism; the axial direction of the powder feeding cavity is perpendicular to the sliding direction of the powder spreading mechanism, but a certain angle error is allowed. The specific error range depends on the actual laying condition. It is determined that this structure can improve the shape of the powder plane laying and improve the powder laying effect.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be implemented Modifications or equivalent replacements without departing from the purpose and scope of the technical solution of the present invention should be covered by the scope of the claims of the present invention.
