Tool changing mechanism for multi-material printing and powder spreading equipment

Abstract

The utility model provides a tool changing mechanism and powder laying equipment for multi-material printing, and belongs to the technical field of additive manufacturing. The multiple scrapers are connected to the tool changing base, the length direction of the scrapers is parallel to the axis direction of the tool changing base, the two ends of each scraper in the length direction are each provided with an adjusting structure, one end of each adjusting structure is connected with the corresponding scraper, and the other end of each adjusting structure is connected with the corresponding tool changing base. The other end of the adjusting structure is located on the side opposite to the side where the scraper is located, and a preset offset distance in the horizontal direction is formed between the axis of the adjusting structure and the axis of the tool changing base. According to the utility model, the cross contamination of powder is avoided, the laser processing quality of products is improved, and the straightness of the scraper is adjusted, so that the two ends of the scraper in the length direction are positioned at the same horizontal height before the scraper flatly scrapes a powder layer on a powder bed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to additive manufacturing technical field relates to a tool changing mechanism especially a tool changing mechanism and powder laying equipment of multi -material printing. BACKGROUND

[0002] Multi -material laser powder bed melting technology is a new type of metal additive manufacturing technology, it breaks through the traditional additive manufacturing technology only can prepare single material's limitation, can deposit a plurality of heterogeneous materials at the arbitrary position of component, has higher design freedom on composition and performance, is the ideal forming technology of fast production multi -material, high performance spare.

[0003] The conventional scheme of realizing multi -material powder bed printing currently adopts single powder laying device (such as same scraper) to lay different powder in turn. This method has significant inherent defects: when same scraper contacts different kinds of powder in turn, the powder laid first will inevitably remain on the surface of scraper, and cause pollution when laying another material subsequently. This cross contamination can cause powder mixing, seriously affect the chemical composition accuracy of printing material, microstructure uniformity and the mechanical properties of final spare. UTILITY MODEL CONTENT

[0004] The utility model aims at the above -mentioned problems existing in prior art, and proposes a tool changing mechanism capable of switching scraper when laying different powder.

[0005] The utility model can be realized by the following technical scheme: a tool changing mechanism for multi -material printing, comprising:

[0006] The scraper seat can rotate circumferentially;

[0007] A plurality of scrapers are distributed in a ring shape and are connected to the scraper seat, and the length direction of the scraper is parallel to the axis direction of the scraper seat, wherein one adjusting structure is arranged at each end along the length direction of the scraper, one end of the adjusting structure is connected to the scraper, the other end of the adjusting structure is located on the opposite side of the side where the scraper is located, and the axis of the adjusting structure and the axis of the scraper seat form a preset offset distance in the horizontal direction.

[0008] In the tool changing mechanism for multi -material printing, the adjusting structure comprises an adjusting frame, and the scraper is clamped between the two sides of the open end of the adjusting frame;Adjusting rod, one end penetrates the outer circumferential surface of the scraper seat, and is screwed to the closed end of the adjusting frame.

[0009] In the multi-material printing tool changing mechanism, the outer circumferential surface of the tool changing seat is recessed in the axial direction of the tool changing seat to form a plurality of mounting grooves, and the opening direction of the mounting grooves is consistent with the opening direction of the adjusting frame, wherein the adjusting frame is embedded in the corresponding mounting groove.

[0010] In the multi-material printing tool changing mechanism, the adjusting structure comprises a first elastic member clamped between the adjusting frame and the bottom of the mounting groove, and the two ends of the first elastic member are connected with the adjusting frame and the bottom of the mounting groove, respectively.

[0011] In the multi-material printing tool changing mechanism, further comprising:

[0012] At least one drive motor, and the output end of the drive motor is connected to one end of the tool changing seat in the axial direction, and the tool changing seat is driven to rotate circumferentially by the drive motor.

[0013] The utility model also provides a kind of powder laying equipment, comprising:

[0014] Powder laying base plate is located above powder bed, and can move along horizontal direction;

[0015] At least two powder falling mechanisms are installed on the powder laying base plate, and each powder falling mechanism is provided with a powder outlet, wherein the position of each powder outlet corresponds to the position of the powder falling outlet on the powder laying base plate;

[0016] Powder suction mechanism is installed on one side of the powder laying base plate, and a powder suction port is provided on the powder suction mechanism;

[0017] The tool changing mechanism is installed on the other side of the powder laying base plate, and the two powder falling mechanisms are located between the powder suction mechanism and the tool changing mechanism.

[0018] In the powder laying equipment, a first adjusting mechanism for adjusting the overall levelness of the tool changing mechanism is further included, and the first adjusting mechanism comprises:

[0019] Mounting plate, the tool changing mechanism is connected to the mounting plate through support plate;

[0020] Two adjustable structures are respectively arranged at both ends of the length direction of the mounting plate, and the adjustable structure comprises an adjusting seat connected with the powder laying base plate and an adjusting shaft inserted into the adjusting seat, wherein one end of the adjusting shaft is connected with the mounting plate, and the other end of the adjusting shaft is provided with a digital display part.

[0021] In the powder laying equipment, the adjusting structure further comprises a second elastic member, and the second elastic member is nested on the adjusting shaft, wherein the two ends of the second elastic member respectively abut with the flange on the adjusting shaft and the adjusting seat.

[0022] In the powder laying device, a second adjusting mechanism for adjusting the levelness of the powder suction mechanism is further included, and the second adjusting mechanism has the same structure as the first adjusting mechanism, wherein the powder suction mechanism comprises a powder suction base provided with a powder suction channel in a powder suction direction, and a powder suction bin connected to the powder suction base and internally provided with a powder suction cavity in communication with the powder suction channel, and a connector connected to an external powder suction device is arranged on the powder suction bin.

[0023] In the powder laying device, the powder falling mechanism comprises:

[0024] a storage bin having an inlet and an outlet at two ends in a powder falling direction, wherein the diameter of the inlet is larger than that of the outlet;

[0025] a powder falling base connected to the outlet of the storage bin and provided with a powder inlet in communication with the outlet on the powder falling base, wherein the powder outlet is arranged on the powder falling base, the powder inlet and the powder outlet are arranged in a staggered manner in the powder falling direction, and a powder scraping plate is arranged on the powder falling base at the position of the powder outlet, one end of the powder scraping plate is connected to the powder falling base through a fixing plate, and the other end of the powder scraping plate is provided with a plurality of powder scraping legs in the length direction;

[0026] a powder falling shaft rotatably connected to the powder falling base and provided with a plurality of powder receiving grooves on the outer circumferential surface of the powder falling shaft, the plurality of powder receiving grooves are arranged in a ring shape along the axis of the powder falling shaft, and the length direction of the powder receiving grooves is parallel to the axis direction of the powder falling shaft, and the powder scraping legs extend into the powder receiving grooves.

[0027] Compared with the prior art, the powder laying device has the following beneficial effects:

[0028] (1) In the powder laying device, a plurality of scrapers are arranged on the tool changing seat, so that the scraping of any one of the materials is matched with the corresponding scraper, thereby avoiding cross contamination of the powder and improving the quality of laser processing of the product; on the other hand, adjusting structures are arranged at both ends of each scraper to adjust the flatness of the scraper, so that the two ends of the scraper in the length direction are at the same height before the scraper scrapes the powder layer on the powder bed, thereby avoiding the formation of a region with uneven thickness on the powder layer after the scraper acts on the powder layer, and providing a quality basis for subsequent laser processing.

[0029] (2) The adjusting end of the adjusting structure is arranged on the opposite side of the installation groove of the corresponding scraper, because when the scraper is used, the scraper is arranged opposite to the powder layer on the powder bed, and at this time, the adjusting end of the adjusting structure for adjusting the scraper is located on the upper surface of the tool changing seat, thereby facilitating the adjustment of the scraper.

[0030] (3), by setting the adjusting frame, the structure originally connected with the scraper is grafted to the adjusting frame, and the two ends of the scraper are adjusted by adjusting the two ends of the adjusting frame, which is convenient and reliable;

[0031] (4), by setting the falling powder shaft, and the powder inlet and the powder outlet are set in a staggered manner, on the one hand, when the falling powder mechanism is in a non-working state, the automatic falling of the powder is avoided, and on the other hand, the uniform and equal discharging of the powder can be realized through the powder receiving groove arranged on the falling powder shaft, thereby providing a basis for subsequent powder layer scraping;

[0032] (5), with the rotation of the falling powder shaft, the residual powder in the powder receiving groove is scraped off the corresponding powder receiving groove through the powder scraping leg on the powder scraping plate, so that the residual powder in the powder receiving groove is avoided, thereby improving the utilization rate of the powder. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structure schematic view of the powder laying equipment.

[0034] Figure 2 is a structure schematic view of the knife changing mechanism in a preferred embodiment of the utility model.

[0035] Figure 3 is a structure schematic view of another perspective of the knife changing mechanism in a preferred embodiment of the utility model.

[0036] Figure 4 is Figure 3 the sectional view of the knife changing mechanism along the section line A-A.

[0037] Figure 5 is a structure schematic view of the falling powder mechanism in a preferred embodiment of the utility model.

[0038] Figure 6 is a structure schematic view of another perspective of the falling powder mechanism in a preferred embodiment of the utility model.

[0039] Figure 7 is Figure 6 the sectional view of the falling powder mechanism along the section line B-B.

[0040] Figure 8 is a structure schematic view of the first adjusting mechanism in a preferred embodiment of the utility model.

[0041] Figure 9 is a structure schematic view of another perspective of the first adjusting mechanism in a preferred embodiment of the utility model.

[0042] Figure 10 is Figure 9 the sectional view of the first adjusting mechanism along the section line C-C.

[0043] Figure 11 is a structure schematic view of the powder suction mechanism in a preferred embodiment of the utility model.

[0044] Figure 12 is a structure schematic view of another view of the powder suction mechanism in a preferred embodiment of the utility model.

[0045] Figure 13 is Figure 12 the sectional view of the powder suction mechanism along the cutting line D-D.

[0046] in the figure,

[0047] 100, powder laying base plate;

[0048] 200, powder falling mechanism; 210, material storage bin; 211, feeding port; 212, discharging port; 220, powder falling seat; 221, powder inlet; 222, powder outlet; 230, powder falling shaft; 231, powder receiving groove; 240, powder falling motor; 250, speed reducer; 260, shaft coupling; 270, powder scraping plate; 271, powder scraping leg; 280, fixing plate;

[0049] 300, powder suction mechanism; 310, powder suction seat; 311, powder suction channel; 312, powder suction port; 320, powder suction bin; 321, powder suction cavity; 330, joint;

[0050] 400, tool changing mechanism; 410, tool changing seat; 411, mounting groove; 420, scraper; 430, adjusting structure; 431, adjusting frame; 432, first elastic member; 433, adjusting rod; 440, driving motor; 450, support plate;

[0051] 500, first adjusting mechanism; 510, mounting plate; 520, adjustable structure; 521, adjusting seat; 522, adjusting shaft; 523, second elastic member; 524, micrometer;

[0052] 600, second adjusting mechanism. DETAILED DESCRIPTION

[0053] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.

[0055] As Figures 1 to 13The utility model provides a kind of powder laying equipment, including:

[0056] Powder laying base plate 100 is located above powder bed, can move along horizontal direction, as carrier;

[0057] At least two powder falling mechanisms 200 are installed side by side on powder laying base plate 100, and each powder falling mechanism 200 is provided with powder outlet 222, wherein the position of each powder outlet 222 corresponds to the position of powder outlet on powder laying base plate 100;

[0058] Powder suction mechanism 300 is installed on one side of powder laying base plate 100, and powder suction mechanism 300 is provided with powder suction port 312, and the powder left after printing on powder bed is sucked;

[0059] Tool changing mechanism 400 is installed on the other side of powder laying base plate 100, and two powder falling mechanisms 200 are located between powder suction mechanism 300 and tool changing mechanism 400, wherein the tool changing mechanism 400 comprises:

[0060] Tool seat 410 can rotate along circumference, and a plurality of installation grooves 411 are provided on the outer circumferential surface of tool seat 410, the opening direction of each installation groove 411 is away from the axis of tool seat 410, and the installation groove 411 is recessed along the outer circumferential surface to the axis direction of tool seat 410, wherein one of the groove walls in each installation groove 411 is in the plane extending through the axis of tool seat 410 along the groove depth direction of installation groove 411;

[0061] A plurality of scrapers 420 are respectively installed on installation groove 411, and the rotation of tool seat 410 causes one of the plurality of scrapers 420 to correspond to the powder layer on powder bed, so as to realize the scraping of powder layer, wherein the two ends along the length direction of scraper 420 are provided with adjusting structure 430, and the two ends of adjusting structure 430 are respectively connected end connected with scraper 420 and adjusting end adjusting the flatness of scraper 420, the adjusting end is located on the opposite side of the installation groove 411 corresponding to scraper 420, and the axis of adjusting structure 430 and the axis of tool seat 410 form a preset offset distance in horizontal direction.

[0062] The utility model provides a kind of powder laying equipment, one part is by being provided with multiple scrapers 420 on tool changer 410, so that the scraper 420 of any one material in multiple materials is matched with, to avoid the cross contamination of powder, improve the quality of product laser processing;Another part is by being provided with adjusting structure 430 in both ends of each scraper 420, the adjustment of straightness of scraper 420 is realized, so that the both ends of scraper 420 in the length direction of scraper 420 before scraping powder bed are at the same level height, avoid the area of uneven thickness formed on powder bed after scraper 420 acts on powder bed, to provide quality basis for subsequent laser processing.

[0063] In addition, the adjusting end of adjusting structure 430 is arranged at the opposite side of the mounting groove 411 corresponding to the scraper 420, because when using the scraper 420, the scraper 420 is arranged opposite to the powder layer on the powder bed, and at this time, the adjusting end of the adjusting structure 430 for adjusting the scraper 420 is just located on the upper surface of the tool changer 410, so as to facilitate the adjustment of the scraper 420.

[0064] It is worth mentioning that the reason for adjusting the scraper 420 is that the scraper 420 is installed on the mounting groove 411 of the tool changer 410, and there may be assembly errors during installation or machining errors of parts. On the other hand, in order to adapt to different types of powder layer, different scrapers 420 need to be switched, and the switching of the scraper 420 is realized by rotating the tool changer 410. With the rotation of the tool changer 410, the scraper 420 may move slightly, causing the both ends of the scraper 420 to be at different levels, i.e. there is a height difference. Therefore, based on the above reasons, an adjusting structure 430 is arranged at each end of the scraper 420, so that the both ends of the scraper 420 are at the same level before scraping the powder layer.

[0065] It is worth mentioning that the adjusting structure 430 can also be arranged as one, i.e. the adjusting structure 430 is arranged at one end of the scraper 420, and a length-variable connecting piece such as a spring is arranged at the other end of the scraper 420, and the both ends of the spring are connected with the scraper 420 and the bottom of the corresponding mounting groove 411 respectively. At this time, the both ends of the scraper 420 form a similar "seesaw" structure. When the end provided with the adjusting structure 430 acts on the scraper 420, causing the scraper 420 at this end to move up or down, the other end of the scraper 420 will correspondingly move down or up, finally realizing that the both ends of the scraper 420 are at the same level.

[0066] In addition, a reference line can be arranged on the scraper 420, and the plane where the slot of the mounting slot 411 is located is the reference plane. When the reference line on the scraper 420 is flush with the reference plane, it indicates that the two ends of the scraper 420 are at the same height. When the two ends of the reference line on the scraper 420 are at different distances from the reference plane, the distance between one end of the reference line and the reference plane can be used as a reference to adjust the other end, so that the distances between the two ends of the reference line and the corresponding reference planes are equal. Alternatively, a small level can be installed on the scraper 420, and the two ends of the scraper 420 are adjusted through the change of the level, so as to ensure that the two ends of the scraper 420 are at the same height.

[0067] It is worth mentioning that the openings of the slots of the two mounting slots 411 on the opposite sides of the tool changer 410 are opposite and symmetrically arranged with the axis of the tool changer 410 as the reference line.

[0068] Preferably, the scraper 420 is connected to the mounting slot 411 through an adjusting frame 431, and the adjusting frame 431 is arranged in a U-shaped structure. The adjusting frame 431 includes an adjusting bottom plate at the closed end of the adjusting frame 431, and side plates on both sides of the opening end of the adjusting frame 431, wherein the scraper 420 is clamped between the two side plates.

[0069] In this embodiment, since the scraper 420 is generally made of rubber, ceramic or high-speed steel, and the thickness of the scraper 420 is relatively thin, it is not conducive to opening holes on the scraper 420 for connection. By arranging the adjusting frame 431, the structure originally connected to the scraper 420 is grafted to the adjusting frame 431, and the adjustment of the two ends of the scraper 420 is realized by adjusting the two ends of the adjusting frame 431, which is convenient and reliable.

[0070] Preferably, the adjusting structure 430 further includes a first elastic member 432 clamped between the adjusting bottom plate and the slot bottom of the mounting slot 411, and the two ends of the first elastic member 432 are connected to the adjusting bottom plate and the slot bottom of the mounting slot 411 respectively; and an adjusting rod 433, one end of which is inserted from the outer circumferential surface of the tool changer 410, passes through the slot bottom of the mounting slot 411, the first elastic member 432, and is screwed to the adjusting bottom plate. By rotating the adjusting rod 433, the relative distance between the adjusting bottom plate and the slot bottom of the mounting slot 411 is changed, in other words, the compression amount of the first elastic member 432 is changed, and then the horizontal height of the two ends of the scraper 420 in the length direction is adjusted.

[0071] Preferably, two drive motors 440 are arranged at the two ends of the tool changer 410 along the axis direction respectively, and the output ends of the two drive motors 440 are connected to the corresponding ends of the tool changer 410 respectively. The two drive motors 440 drive the two ends of the tool changer 410 to rotate synchronously in the circumferential direction.

[0072] It is worth mentioning that when the power of the driving motor 440 is small, the number of the driving motor 440 is two; when the power of the driving motor 440 is large, the number of the driving motor 440 can be one, and when the number of the driving motor 440 is one, it can be connected with any one of the two ends along the axis direction in the tool holder 410.

[0073] Preferably, the powder falling mechanism 200 comprises:

[0074] A storage bin 210 is vertically arranged, and the two ends of the storage bin 210 along the powder falling direction are respectively an inlet 211 and an outlet 212, wherein the diameter of the inlet 211 is larger than that of the outlet 212;

[0075] A powder falling seat 220 is connected to the outlet 212 of the storage bin 210, and a powder inlet 221 is arranged on the powder falling seat 220 and communicates with the outlet 212, wherein a powder outlet 222 is arranged on the powder falling seat 220, and the powder inlet 221 and the powder outlet 222 are arranged in a staggered manner along the powder falling direction;

[0076] A powder falling shaft 230 is rotatably connected in the powder falling seat 220, and a plurality of powder receiving grooves 231 are arranged on the outer circumferential surface of the powder falling shaft 230, the plurality of powder receiving grooves 231 are arranged in a ring shape along the axis of the powder falling shaft 230, and the length direction of the powder receiving groove 231 is parallel to the axis direction of the powder falling shaft 230, wherein the powder falling shaft 230 receives the powder falling from the powder inlet 221 through the powder receiving groove 231, and transports the powder in the corresponding powder receiving groove 231 to the powder outlet 222 with the rotation of the powder falling shaft 230, and the powder falls from the powder outlet 222, completing the powder falling.

[0077] In the embodiment, by arranging the powder falling shaft 230 and arranging the powder inlet 221 and the powder outlet 222 in a staggered manner, on the one hand, the automatic falling of the powder is avoided when the powder falling mechanism 200 is in an idle state, and on the other hand, the uniform and equal discharging of the powder is realized through the powder receiving groove 231 arranged on the powder falling shaft 230, providing a basis for subsequent powder layer scraping.

[0078] Further preferably, the powder falling mechanism 200 comprises a powder falling motor 240, and the output end of the powder falling motor 240 is connected with a speed reducer 250, the output end of the speed reducer 250 is connected with a shaft coupling 260, and the output end of the shaft coupling 260 is connected with the powder falling shaft 230, wherein the output direction of the output end of the powder falling motor 240 is perpendicular to the axis direction of the powder falling shaft 230.

[0079] Preferably, a powder scraping plate 270 is arranged on the powder falling seat 220 at the position of the powder outlet 222, the powder scraping plate 270 is arranged in an L shape, one end of the powder scraping plate 270 is connected to the powder falling seat 220 through a fixing plate 280, and the other end of the powder scraping plate 270 is provided with a plurality of powder scraping legs 271 along the length direction, wherein the powder scraping legs 271 extend into the powder receiving groove 231.

[0080] In the embodiment, as the powder falling shaft 230 rotates, the residual powder in the powder receiving groove 231 is scraped off by the powder scraping legs 271 on the powder scraping plate 270, avoiding the residual powder in the powder receiving groove 231, thereby improving the utilization rate of the powder.

[0081] Preferably, the powder suction mechanism 300 comprises a powder suction seat 310, and a powder suction channel 311 is arranged on the powder suction seat 310 along the powder suction direction; a powder suction bin 320 is connected to the powder suction seat 310, and a powder suction cavity 321 is arranged in the powder suction bin 320 and communicates with the powder suction channel 311, and a connector 330 connected to an external powder suction device, such as a powder suction device, is arranged on the powder suction bin 320, wherein when the powder suction device is turned on, the residual powder on the powder bed enters the powder suction channel 311 through a powder suction port 312, and then enters the powder suction device through the powder suction cavity 321, and the powder suction operation is completed.

[0082] It is worth mentioning that the number of the powder suction cavities 321 can be two or more, and they are arranged side by side, wherein each powder suction cavity 321 communicates with the powder suction channel 311.

[0083] Preferably, the powder spreading device further comprises a first adjusting mechanism 500 for adjusting the levelness of the tool changing mechanism 400, and a second adjusting mechanism 600 for adjusting the levelness of the powder suction mechanism 300, and the first adjusting mechanism 500 and the second adjusting mechanism 600 have the same structure.

[0084] It is worth mentioning that the first adjusting mechanism 500 is used to adjust the overall levelness of the tool changing mechanism 400, and to coarsely adjust the tool changing mechanism 400, so that the two ends of the tool changing seat 410 in the axial direction are at the same level, and then the two ends of the scraping tool 420 in the length direction are at the same level; the second adjusting mechanism 600 is used to adjust the levelness of the powder suction mechanism 300, and to make the two ends of the powder suction port 312 in the length direction on the powder suction mechanism 300 at the same level, so that the suction force on each position on the powder bed corresponding to the powder suction port 312 is the same, thereby improving the reliability of the powder suction.

[0085] Since the first adjusting mechanism 500 and the second adjusting mechanism 600 have the same structure, the first adjusting mechanism 500 will be described as an example.

[0086] Preferably, the first adjusting mechanism 500 comprises:

[0087] The mounting plate 510 is connected with the tool changing mechanism 400 through the support plate 450;

[0088] Two adjustable structures 520 are arranged at two ends of the length direction of the mounting plate 510, the adjustable structure 520 comprises an adjusting seat 521 connected with the powder laying bottom plate 100, an adjusting shaft 522 inserted into the adjusting seat 521, and a second elastic element 523 nested on the adjusting shaft 522, two ends of the second elastic element 523 are respectively in abutment with a flange on the adjusting shaft 522 and the adjusting seat 521, and one end of the adjusting shaft 522 is connected with the mounting plate 510, and the other end of the adjusting shaft 522 is connected with a digital display part, such as a micrometer 524, the mounting plate 510 is driven to move up and down along the powder falling direction by rotating the micrometer 524, so as to promote the two ends of the tool changing seat 410 in the axial direction to be at the same height.

[0089] It should be noted that the description such as "first", "second", "one" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0090] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0091] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A multi-material printing tool changer mechanism, characterized by, The application relates to a multi-material printing tool changing mechanism. The tool changing seat can rotate in the circumferential direction; a plurality of scrapers are arranged in a ring shape and are connected to the tool changing seat, and the length direction of the scrapers is parallel to the axis direction of the tool changing seat; one adjusting structure is arranged at each end of the length direction of the scrapers, one end of the adjusting structure is connected to the scraper, and the other end of the adjusting structure is located on the opposite side of the side corresponding to the scraper, and the axis of the adjusting structure and the axis of the tool changing seat form a preset offset distance in the horizontal direction. The adjusting structure comprises an adjusting frame, and the scraper is clamped between the two sides of the open end of the adjusting frame.

2. The multi-material printed tool changer of claim 1, wherein, An adjusting rod penetrates through the outer circumferential surface of the tool changing seat at one end and is screwed to the closed end of the adjusting frame. The outer circumferential surface of the tool changing seat is recessed in the axis direction of the tool changing seat to form a plurality of mounting grooves, and the opening direction of the mounting grooves is consistent with the opening direction of the adjusting frame, wherein the adjusting frame is embedded in the corresponding mounting groove.

3. The multi-material printed tool changer of claim 2, wherein, The adjusting structure comprises a first elastic member clamped between the adjusting frame and the bottom of the mounting groove, and the two ends of the first elastic member are connected to the adjusting frame and the bottom of the mounting groove respectively.

4. The multi-material printed tool changer of claim 3, wherein, Further comprising:

5. The multi-material printed tool changer of any of claims 1 to 4, wherein, At least one driving motor, and the output end of the driving motor is connected to one end of the two ends of the axis direction of the tool changing seat, and the driving motor drives the tool changing seat to rotate in the circumferential direction. The application relates to a multi-material printing tool changing mechanism.

6. A powder spreading apparatus characterized by comprising: The powder laying base plate is located above the powder bed and can move in the horizontal direction. At least two powder falling mechanisms are arranged on the powder laying base plate, and each powder falling mechanism is provided with a powder outlet, wherein the position of each powder outlet corresponds to the position of the powder falling outlet on the powder laying base plate. A powder suction mechanism is arranged on one side of the powder laying base plate, and the powder suction mechanism is provided with a powder suction opening. The multi-material printing tool changing mechanism according to any one of claims 1 to 5 is arranged on the other side of the powder laying base plate, and the two powder falling mechanisms are located between the powder suction mechanism and the tool changing mechanism. Further comprising a first adjusting mechanism for adjusting the overall levelness of the tool changing mechanism, and the first adjusting mechanism comprises:

7. The powder spreading device of claim 6, wherein, A mounting plate, and the tool changing mechanism is connected to the mounting plate through a support plate; Two adjustable structures are arranged at the two ends of the length direction of the mounting plate, and the adjustable structure comprises an adjusting seat connected to the powder laying base plate and an adjusting shaft inserted into the adjusting seat, wherein one end of the adjusting shaft is connected to the mounting plate, and the other end of the adjusting shaft is provided with a digital display part. The adjustable structure further comprises a second elastic member, and the second elastic member is nested on the adjusting shaft, wherein the two ends of the second elastic member are in abutment with the flange on the adjusting shaft and the adjusting seat respectively.

8. The powder spreading apparatus of claim 7, wherein, Further comprising a second adjusting mechanism for adjusting the levelness of the powder suction mechanism, and the second adjusting mechanism is the same as the first adjusting mechanism, wherein the powder suction mechanism comprises a powder suction seat and a powder suction channel arranged on the powder suction seat in the powder suction direction; a powder suction bin connected to the powder suction seat and provided with a powder suction cavity in communication with the powder suction channel, and a connector connected to an external powder suction device is arranged on the powder suction bin.

9. The powder spreading apparatus of claim 7, wherein, The powder falling mechanism comprises:

10. The powder spreading apparatus of claim 6, wherein, ​ The storage bin is provided with an inlet and an outlet at two ends along the powder falling direction, wherein the diameter of the inlet is larger than that of the outlet; The powder falling seat is connected to the outlet of the storage bin and is provided with an inlet communicating with the outlet, wherein the outlet is arranged on the powder falling seat, the inlet and the outlet are arranged in a staggered manner along the powder falling direction, and a powder scraping plate is arranged on the powder falling seat at the position of the outlet, one end of the powder scraping plate is connected to the powder falling seat through a fixing plate, and the other end of the powder scraping plate is provided with a plurality of powder scraping legs along the length direction; The powder falling shaft is rotatably connected to the powder falling seat and is provided with a plurality of powder receiving grooves on the outer circumferential surface, the plurality of powder receiving grooves are distributed in a ring shape along the axis of the powder falling shaft, and the length direction of the powder receiving grooves is parallel to the axis direction of the powder falling shaft, wherein the powder scraping legs extend into the powder receiving grooves.

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