A coating scraper device and 3D printing equipment equipped with the same

Abstract

The present invention provides a coating scraper device and a 3D printing device equipped with the device, which is used for coating 3D printing materials in the 3D printing device, and is equipped with: a workbench unit, a scraper unit and a frame platform; the workbench unit is equipped with: a workbench; a molding cylinder; a molding cylinder driving mechanism; a material cylinder; and a material cylinder driving mechanism; the scraper unit moves horizontally along the plane where the upper surface of the workbench is located, and is equipped with: a coating scraper main body frame; a scraper unit driving mechanism; two coating scrapers that move a specified distance in the up and down directions respectively; a clutch cam mechanism; and a clutch cam driving mechanism. According to the present invention, by arranging two coating scrapers, printing can be achieved during the reciprocating motion of the coating scraper device on the workbench, and the structure is simple, the coating is uniform, the working efficiency is high, and the material utilization rate is high.

Description

Technical Field

[0001] The invention relates to a coating scraper device and 3D printing equipment equipped with the device. Background Art

[0002] 3D printing is a rapid prototyping technology that uses digital model files as the basis and uses powdered metals, plastics, resins and other bondable materials to construct objects by printing layer by layer. 3D printing equipment manufactures 3D objects by executing this printing technology. Due to its high molding precision, 3D printing equipment is widely used in molds, customized products, medical fixtures, prostheses and other fields. Currently, the more popular 3D printing technologies mainly include SLA / DLP technology, FDM fused deposition modeling technology, 3DP technology, SLS selective laser sintering, etc.

[0003] Among them, 3D printing materials, as an emerging technology industry, have developed rapidly in recent years and have become a key industry promoted by the country. And the types of 3D printing materials vary according to the different 3D printing molding technologies. At present, the total amount of 3D printing materials is more than 200, and new materials are born every once in a while. In recent years, plastic materials, ceramic materials, metal materials, wood materials, wax materials, etc. have emerged as 3D printing materials.

[0004] The coating scrapers used for coating 3D printing materials such as metal powder and ceramic materials on the market usually adopt a single scraper structure, which has the advantages of simple structure and low cost, but also has disadvantages that cannot be ignored. Specifically, when the 3D printing equipment is designed as a relatively common structure with a forming cylinder and a material cylinder in parallel, the single scraper can only coat the 3D printing material in one direction, that is, the material in the material cylinder is scraped into the forming cylinder in one direction, and only one layer can be printed each time. When printing the next layer, the scraper needs to return to the material cylinder position. In addition, the one-way scraper cannot scrape the excess 3D printing material of the previous layer back to the material cylinder, which is not only inefficient, but also cannot make full use of the raw materials. Printing parts of the same height requires more raw materials. Summary of the invention

[0005] Problems to be solved by the invention:

[0006] In view of the above problems, the object of the present invention is to provide a coating scraper device with simple structure, uniform coating, high working efficiency and high material utilization rate, and a 3D printing device equipped with the device.

[0007] Technical means to solve the problem:

[0008] The present invention provides a coating scraper device, which is used for coating 3D printing materials in a 3D printing device, and comprises: a workbench unit, a scraper unit and a frame platform;

[0009] The workbench unit comprises:

[0010] A workbench for printing workpieces; a forming cylinder installed concavely on the workbench and containing the workpiece to be formed; a forming cylinder driving mechanism capable of moving the forming cylinder a specified distance in the vertical direction perpendicular to the plane where the upper surface of the workbench is located; a material cylinder installed concavely on the workbench and arranged in parallel with the forming cylinder and containing printing materials; and a material cylinder driving mechanism capable of moving the material cylinder a specified distance in the vertical direction;

[0011] The scraper unit moves horizontally along the plane where the upper surface of the workbench is located, and has:

[0012] A coating scraper main body frame installed on the workbench unit and capable of moving along the parallel direction of the material cylinder and the forming cylinder; a scraper unit driving mechanism that drives the coating scraper main body frame to move horizontally along the plane where the upper surface of the workbench is located; two coating scrapers that are arranged in parallel in the coating scraper main body frame and move a specified distance along the up and down directions respectively; a clutch cam mechanism installed on the coating scraper main body frame and connected to the two coating scrapers; and a clutch cam driving mechanism that drives the clutch cam mechanism to rotate, thereby driving the two coating scrapers to move respectively along the up and down directions.

[0013] According to the present invention, two coating scrapers which can move in the up and down directions respectively are provided, so that printing can be realized during the reciprocating motion of the coating scraper device on the workbench, that is, double-layer printing can be realized by each reciprocating motion of the coating scraper device relative to the workbench, that is, each unidirectional movement of the coating scraper device on the workbench realizes coating of the printing material once, and correspondingly, each reverse movement back to the original position realizes coating of the printing material once, thereby improving the printing efficiency.

[0014] Specifically, the scraper unit is located in the starting position, closer to the material cylinder than the forming cylinder, and the clutch cam drive mechanism drives the cam to rotate, so that one of the two coating scrapers that is relatively far away from the material cylinder is lowered to abut against the upper surface of the workbench, and the other coating scraper is lifted to a specified height from the upper surface of the workbench. At the same time, the material cylinder drive mechanism drives the material cylinder to move up to a height of one printing layer thickness, and squeezes out the raw material (i.e., printing material) in the cylinder. To ensure uniform coating without omissions, the extruded material at this time must be more than the material required to coat a layer of workpiece.

[0015] Next, the scraper unit moves along the upper surface of the workbench driven by the scraper unit driving mechanism. One coating scraper first scrapes across the material cylinder and applies the printing material extruded therein to the subsequently passed forming cylinder to realize the first layer of printing. Since there is still some material extruded from the material cylinder after the first layer of printing, the clutch cam driving mechanism drives the cam of the clutch cam mechanism to rotate again, so that one of the two coating scrapers that was originally in contact with the upper surface of the workbench is lifted to a specified height from the upper surface of the workbench, and the other coating scraper is lowered to contact with the upper surface of the workbench. At the same time, after each layer of printing is completed, the forming cylinder driving mechanism drives the forming cylinder to move down by the height of one printing layer thickness.

[0016] Then, the scraper unit moves in the opposite direction along the upper surface of the workbench under the drive of the scraper unit driving mechanism, that is, returns to the starting position. During this movement, the other coating scraper contacts the upper surface of the workbench to scrape the remaining material across the forming cylinder to achieve the second layer of printing, and then pushes the remaining printing material back to the material cylinder. At this point, the scraper unit completes a reciprocating motion to achieve two-layer printing.

[0017] Alternatively, in the present invention, the scraper unit further comprises: a pre-laying roller arranged parallel to the two coating scrapers and located between the two coating scrapers; and a pre-laying roller driving mechanism driving the pre-laying roller to rotate and / or move a specified distance in the up and down direction.

[0018] Therefore, by adding a pre-laying roller, the material can be pre-mixed before the scraper scrapes the printing material flat, and then the printing material is evenly coated on the top of the forming cylinder through the coating scraper, thereby improving the coating quality of each single layer coating, and improving the printing quality and success rate.

[0019] Alternatively, in the present invention, a pair of guide rails for moving the scraper unit are protrudingly provided on the upper surface of the workbench, and the pair of guide rails are formed on the workbench to sandwich the forming cylinder and the material cylinder to form a scraper groove having a size corresponding to the width of the coating scraper.

[0020] Therefore, the material scraped out by the scraper after the first coating is all in the scraper groove. During the second reverse coating, almost all the remaining material can be coated again along the scraper groove and pushed back to the material cylinder, so that the material can be recycled as much as possible and the waste of material can be avoided. Since the material can be almost fully utilized, the working cost can be reduced. In theory, equal filling of the material cylinder to the forming cylinder can be achieved.

[0021] Alternatively, in the present invention, the 3D printing material is ceramic paste, ceramic slurry, plastic powder, metal powder or wax powder.

[0022] Alternatively, in the present invention, the driving mechanism is a stepping motor or a driving motor.

[0023] Alternatively, in the present invention, the molding cylinder and the material cylinder have the same size, thereby further reducing manufacturing costs and achieving a compact structure.

[0024] The present invention also provides a 3D printing device having the coating scraper device.

[0025] Effect of the invention:

[0026] The object of the present invention is to provide a coating scraper device with simple structure, uniform coating, high working efficiency and high material utilization rate, and a 3D printing device equipped with the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view showing a coating blade device of the present invention;

[0028] Figure 2 is a side view showing a coating blade device of the present invention;

[0029] Figure 3 is a top view showing a coating blade device of the present invention;

[0030] Figure 4 is a perspective view showing a portion of a scraper unit of the present invention;

[0031] Figure 5 is shown along Figure 3 The cross-sectional view of a portion of the scraper unit observed along the AA section line shown;

[0032] Figure 6 is a partial stereoscopic diagram showing the structure related to the clutch cam mechanism of the scraper unit of the present invention;

[0033] Explanation of symbols:

[0034] D-coating scraper device;

[0035] 1- workbench unit; 10- workbench; 11- forming cylinder; 12- forming cylinder driving mechanism; 13- material cylinder; 14- material cylinder driving mechanism; 15- guide rail;

[0036] 2-scraper unit; 21-coating scraper main body frame; 22-scraper unit driving mechanism; 23-coating scraper; 24-clutch cam mechanism; 25-clutch cam driving mechanism; 26-pre-laying roller; 27-pre-laying roller driving mechanism;

[0037] 3-Frame platform. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the following embodiments. It should be understood that the following embodiments are only used to illustrate the present invention, not to limit the present invention. Based on the embodiments, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The same or corresponding reference numerals in the figures represent the same components, and repeated descriptions are omitted.

[0039] In addition, each mechanical term is used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the present invention, for the convenience of description, the moving direction of the workbench during the printing process is defined as the "up and down direction", and the directions or positional relationships indicated by the terms "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Figure 1 1 is a perspective view showing a coating blade device D of the present invention, Figure 2 1 is a side view showing a coating blade device D of the present invention, Figure 3 2 is a top view showing a coating blade device D of the present invention. Figures 1 to 3 As shown, a coating scraper device D is disclosed herein, which is used for coating 3D printing materials in a 3D printing device, and comprises a workbench unit 1, a scraper unit 3 and a frame platform 3. The frame platform 3 is used to support the workbench unit 1 and the scraper unit 2, and the specific structure and form are not limited as long as they can play the role of fixing and supporting.

[0041] [Workbench unit]

[0042] In the present invention, the workbench unit 1 comprises a workbench 10, a forming cylinder 11, a forming cylinder driving mechanism 12, a material cylinder 13, a material cylinder driving mechanism 14 and a pair of guide rails 15. Specifically, the workbench 10 has a horizontal upper surface of the workbench for printing 3D workpieces, on which the forming cylinder 11 for holding the workpiece to be formed and the material cylinder 13 for holding the 3D printing material are respectively installed in a concave manner. The upper openings of the forming cylinder 11 and the material cylinder 13 are flush with the upper surface of the workbench, and the lower sides are respectively connected to the forming cylinder driving mechanism 12 and the material cylinder driving mechanism 14, which can move the forming cylinder 11 and the material cylinder 13 relative to the workbench 10 in the up and down direction perpendicular to the upper surface of the workbench by a predetermined distance under the drive of the driving mechanism.

[0043] Furthermore, the forming cylinder 11 and the material cylinder 13 are arranged side by side in the moving direction of the scraper unit 2. In particular, in the present invention, since the material cylinder 13 can be filled into the forming cylinder 11 in equal amounts (i.e., 1:1), the forming cylinder 11 and the material cylinder 13 can have substantially the same shape and size. In addition, the forming cylinder 11 and the material cylinder 13 are also formed into a structure with variable internal storage space, and the storage space in the cylinder can be squeezed and expanded by means of the forming cylinder drive mechanism 12 installed below the forming cylinder 11 and the material cylinder drive mechanism 14 installed below the material cylinder 13. For example, in the present invention, the forming cylinder 11 and the material cylinder 13 are formed into a structure similar to a syringe, and the size of the space inside the "syringe" (i.e., the storage space for workpieces or materials) can be changed by controlling the up and down movement of the "core rod" by a driving mechanism. For another example, the printing material in the material cylinder 13 can be squeezed out from the opening by squeezing the space inside the "syringe" by the "core rod". For another example, the forming cylinder 11 can accommodate a larger workpiece by increasing the space inside the "syringe" by the "core rod", but the specific implementation method is not limited to the above examples.

[0044] In addition, a pair of guide rails 15 are arranged on the upper surface of the workbench in the form of sandwiching two parallel molding cylinders 11 and material cylinders 13, and are used to guide the scraper unit 2 to move along a specified track. The guide rails 15 are formed into a structure protruding upward from the upper surface of the workbench, so that scraper grooves corresponding to the size of the coating scraper described later are formed between each other. As a result, the printing material applied each time will not spread around beyond the guide rails 15 protruding from the surface of the workbench, but will be blocked in the scraper groove between the two guide rails, which can fully utilize the material and avoid the subsequent tedious cleaning work.

[0045] [Scraper unit]

[0046] In the present invention, the scraper unit 2 as a whole can move horizontally along the plane of the upper surface of the workbench, and is equipped with a coating scraper main frame 21, a scraper unit driving mechanism 22, a coating scraper 23, a clutch cam mechanism 24, a clutch cam driving mechanism 25, a pre-laying roller 26 and a pre-laying roller driving mechanism 27. Figure 4 2 is a perspective view showing a portion of the scraper unit 2 of the present invention. Figure 5 is shown along Figure 3 The cross-sectional view of a portion of the scraper unit 2 observed along the AA section line is shown. Figure 6 It is a partial perspective view showing the structure related to the clutch cam mechanism 24 of the scraper unit 2 of the present invention.

[0047] like Figures 4 to 6As shown, the coating scraper main body frame 21 is installed on the workbench 10, and is mainly composed of parallel clamping plates 211 on both sides and multiple rod members 212 arranged between the clamping plates 211. Multiple rod members 212 are arranged in parallel between the two clamping plates 211 and mainly play a supporting and fixing role. In theory, there is no limit on the number, size, installation method, etc., as long as the structure can be stable and does not interfere with other structures. However, in practice, as shown in the present invention, it is preferred that four rod members 212 are symmetrically fixed to the corners. The coating scraper main body frame 21 is further mounted on the frame platform 3 to stabilize the overall structure of the device, that is, the width of the coating scraper device D is limited by the clamping plates 211 on both sides in the present invention, the purpose is to achieve the whole device to be stably mounted on the frame platform 3 by a mechanical structure, but in fact, it is completely unnecessary to form such a structure of clamping the frame platform 3. For example, a mechanical structure can be used to relatively movably mount the scraper unit 2 on the workbench unit 1, and another mechanical structure can be used to stably mount the scraper unit 2 and the workbench unit 1 on the frame platform 3, and the coating scraper device D is structurally stable by two mechanical structures. Among them, the above-mentioned mechanical structure is not limited to gear interlocking, locking by clamping, or even welding fixation.

[0048] Again, if Figure 3 As shown, the scraper unit drive mechanism 22 is installed on the frame platform 3. Figure 2 The transmission belt 221 shown is connected to the coating scraper main body frame 21 to drive it to translate along the left-right direction as shown in the figure, that is, the parallel direction of the material cylinder 13 and the forming cylinder 11. The installation position of the scraper unit drive mechanism 22 is not specifically limited, and the driving method is not limited to the transmission belt, which can be adjusted according to actual conditions. In the following, for the sake of simplicity, the coating scraper main body frame 21 and its internal structure are generally referred to as the scraper unit 2 without separately emphasizing the scraper unit drive mechanism 22.

[0049] Two coating scrapers 23 with the same structure are staggered and arranged in parallel between the two clamping plates 211, that is, the coating scraper 23 and the rod member 212 are also parallel to each other. Two clutch cam mechanisms 24 are respectively installed on the inner side surface between the clamping plates 211 on both sides, and the two ends of the two coating scrapers 23 are respectively connected to the clutch cam mechanisms 24. The clutch cam driving mechanism 25 is installed on the outer side surface of the clamping plate 211 on either side, and has a clutch main shaft 251 arranged between the two clamping plates 211. The two clutch cam mechanisms 24 are respectively connected to the two ends of the clutch main shaft 251, so that the clutch main shaft 251 rotates a specified angle under the drive of the clutch cam driving mechanism 25, thereby driving the two coating scrapers 23 to move in the up and down directions respectively.

[0050] Specifically, Figure 6As shown, the two ends of the coating scrapers 23 on both sides are respectively connected to two elastic components 245 such as springs, and there are four elastic components in total. One end of the elastic component 245 is fixed, and the coating scraper 23 can be moved in the elastic direction (up and down direction in this embodiment) within the elastic range due to the elastic deformation of the elastic component under the action of external force. The clutch cam mechanism 24 has a follower 247 and a cam 244 respectively connected to the two coating scrapers 23 and the elastic component 245, that is, the clutch cam mechanism 24 on both sides has a total of four followers 247 and cams 244, one end of the follower 247 is in relative movability contact with the cam 244, and the other end is connected to the coating scraper 23 or the elastic component 245, the protruding parts of the two cams 244 on the same side should be opposite to ensure that the two scrapers connected to each other can be up and down, and the protruding parts of the two cams 244 connected to the two ends of the same coating scraper 23 should be in the same direction to ensure that the two ends of the scraper are synchronized.

[0051] When the clutch cam driving mechanism 25 drives the cam 244 of the clutch cam mechanism 24 to rotate via the clutch main shaft 251, the cam 244 rotates, causing the follower 247 to move up and down regularly due to its shape characteristics, thereby applying an external force to the elastic member 245. Since the protruding parts on the same side are installed in opposite directions, the elastic member 245 on one side is subjected to less pressure and is relatively elongated, pushing the coating scraper 23 downward, while the elastic member 245 on the other side is subjected to greater pressure and is relatively shortened, driving the coating scraper 23 upward, thereby achieving the up and down movement of the coating scraper 23. The clutch cam mechanisms 24 are installed at both ends (both sides) of the coating scraper 23, and synchronous drive is achieved through a clutch main shaft 251, so that stable up and down movement can be achieved. In this embodiment, Figure 6 A mechanical structure is shown in which a cam rotates to drive a scraper to move up and down, but it is not limited to this. For example, there is no technical obstacle for those skilled in the art to realize the up and down movement of the scraper by means of rotating a gear set.

[0052] In addition, a pre-laying roller 26 is provided between the two clamping plates 211 and between the two coating scrapers 23, and is formed into a structure parallel to the rod member 212 and the like. The pre-laying roller drive 27 is installed on the outer surface of the clamping plate 211 on either side, and is electrically connected to the pre-laying roller 26, and is used to drive the pre-laying roller 26 to rotate and / or move a specified distance in the up and down direction. For example, the actual height of the pre-laying roller 26 can be adjusted according to the amount of printing materials, etc. to achieve the mixing degree and the evenly spread state of the printing materials after rolling, and the pre-laying roller 26 can also be raised according to actual needs so that it does not participate in the rolling work at all. By adding the pre-laying roller 26, the material can be pre-mixed before the coating scraper 23 flattens the printing material, and then the printing material is evenly coated on the top of the forming cylinder 11 by the coating scraper 23, thereby improving the coating quality during each single-layer coating, and improving the printing quality and success rate. In addition, in the present invention, the pre-laying roller drive 27 and the clutch cam drive mechanism 25 are installed on the same side in an overlapping manner, but are not limited to this. In addition, the pre-laying roller 26 and the coating scraper 23 can be controlled by independent driving motors respectively.

[0053] <Example>

[0054] The following examples are further given to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the specific working mode of the present invention.

[0055] like Figures 1 to 3 As shown, the scraper unit 2 is located at a position close to the material cylinder 13 as the starting position. At this time, the scraper unit 2 is closer to the material cylinder 13 than the forming cylinder 11, and the clutch cam driving mechanism 25 drives the clutch cam mechanism 24 to rotate, so that the coating scraper 23 (the one farthest from the material cylinder 13) of the two coating scrapers 23 is relatively close to the material cylinder 13. Figure 3 The right side shown in the figure) is lowered to abut against the upper surface of the workbench, and the other coating scraper 23 (( Figure 3 The left side shown in the figure is lifted to a specified height from the upper surface of the workbench. The specified height is not limited, and the requirement is to avoid touching the printing material as much as possible. At the same time, the cylinder drive mechanism 14 drives the cylinder 13 to move up to a specified height to extrude the 3D printing material in the cylinder. In order to ensure uniform coating without omission, the extruded printing material must be more than the amount of material required to coat a layer of workpiece.

[0056] Then, the scraper unit 2 is driven by the scraper unit driving mechanism 22 to move along the upper surface of the workbench. Figure 3As shown, the pre-laying roller 26 moves in the left and right directions, and is located between the two coating scrapers 23. Therefore, it contacts the printing material extruded from the material cylinder 13 earlier than the coating scraper 23 abutting against the upper surface of the workbench. After mixing, the coating scraper 23 on the right first passes through the material cylinder 13, scrapes out the printing material therein and evenly coats it on the workpiece to be printed in the forming cylinder 11 that passes subsequently, thereby realizing the first layer of printing. However, some printing material extruded from the material cylinder 13 still remains after the first layer of printing.

[0057] At this time, the scraper unit 2 stops at a position close to the molding cylinder 11, that is, the scraper unit 2 is closer to the molding cylinder 11 than the material cylinder 13. The clutch cam drive mechanism 25 drives the clutch cam mechanism 24 to rotate, so that one of the two coating scrapers 23 that originally abuts against the upper surface of the workbench ( Figure 3 The right side shown in the figure) is lifted to a specified height from the upper surface of the workbench, and the other side coating scraper 23 (( Figure 3 The left side shown in the figure is lowered to abut against the upper surface of the workbench, which can be understood as exchanging the relative up and down relationship of the two coating scrapers 23.

[0058] Then, the scraper unit 2 moves in the opposite direction along the upper surface of the workbench under the drive of the scraper unit driving mechanism 22, that is, returns to the starting position. During this movement, the coating scraper 23 on the other side contacts the upper surface of the workbench to scrape up the remaining material and coat it on the workpiece to be printed in the forming cylinder 11, thereby realizing the second layer of printing, and then most of the remaining printing material is pushed back to the material cylinder 13. At this point, the scraper unit 2 completes a reciprocating motion and realizes two-layer 3D printing.

[0059] After each layer is printed, no matter the scraper unit 2 is on the way out or on the way back to the starting position, the forming cylinder driving mechanism 12 drives the forming cylinder 11 to move down by the thickness of one layer to wait for the next printing. The material cylinder driving mechanism 14 drives the material cylinder 13 to move up to extrude the printing material when the scraper unit 2 is on the way out, and moves down to accommodate the remaining printing material pushed back when the scraper unit 2 is on the way back.

[0060] As a result, not only can a high utilization rate of printing materials be achieved, but also the reciprocating motion of the scraper is effective coating, which enables full utilization of materials, thus greatly improving the working efficiency of the 3D printing equipment.

[0061] In addition, each time it reciprocates, the coating scraper 23 on the side relatively far from the cylinder body contacts the upper surface of the workbench, and the coating scraper 23 on the other side is lifted up. After the first coating of the printing material, the excess material scraped out is blocked in the scraper groove by the guide rails 15 on both sides. After the scraper unit 2 moves to the other end, the coating scraper 23 on the other side relatively far from the cylinder body contacts the upper surface of the workbench, and the coating scraper 23 on the side that works slightly ahead is lifted up. When the second reverse coating of the printing material is performed, the residual material in the scraper groove can be almost completely pushed back to the material cylinder 13 after re-coating. The two round-trip coatings are performed by the farther side scraper of the two coating scrapers 23, so there will be no residual material between the scrapers. The guide rail 15 is raised to form a scraper groove that matches the width of the coating scraper 23, and each scraping can scrape away all the material in the groove. The pre-laying roller 26 rolls the printing material in advance before the coating scraper 23 is coated, so that it is mixed evenly and spread as flat as possible, which is convenient for the subsequent coating scraper 23 to efficiently coat. In this way, the material can be recycled as much as possible to avoid wasting the material. Since the material can be almost completely utilized, the working cost can be reduced. In theory, equal filling of the material cylinder 13 to the forming cylinder 11 can be achieved.

[0062] In addition, in the present invention, all the above-mentioned driving mechanisms are not particularly limited, as long as they can achieve the corresponding functions, for example, they can be stepper motors or drive motors. In addition, the present invention has a wide range of industrial applications, and the applicable 3D printing materials can be powder materials such as ceramic pastes, ceramic slurries, plastic powders, metal powders or wax powders. In addition, a pair of guide rails 15 and the scraper grooves formed by them can also be formed as a structure that is recessed downward compared to the upper surface of the workbench, which can have roughly the same effect as the scraper grooves formed by the pair of guide rails 15 protruding upward. In addition, the frame platform 3 can be formed into various sizes to match the peripheral equipment, as long as it can support and fix the coating scraper 23 device D thereon. In this way, there is no need to change the coating scraper 23 device D, but it can maximize the matching of various installation places and adapt to the surrounding environment, and enhance the compatibility of the device at the lowest cost. In addition, the present invention can also make the material cylinder drive mechanism 14 drive the material cylinder 13 to move up the height of two layers of printing layer thickness according to the properties of the printing material, and extrude just the right amount of printing material for two reciprocating coatings. At this time, the material cylinder 13 does not need to be lowered when the scraper unit 2 returns. Furthermore, in the present invention, the scraper shape, roller shape, etc. are not specifically limited and can be formed into a multi-piece assembly structure as shown in the drawings, but can also be formed into other structures that achieve similar functions, such as an integrated scraper formed into a single piece.

[0063] In summary, the coating scraper device D of the present invention has a simple structure, uniform coating, high working efficiency, high material utilization rate and a wide range of applications, which is of great benefit to industrial production.

[0064] The above specific implementations further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above is only a specific implementation of the present invention and is not limited to the protection scope of the present invention. Without departing from the purpose of the basic characteristics of the present invention, the present invention can be embodied in various forms. Therefore, the implementation forms in the present invention are used for illustration rather than limitation. Since the scope of the present invention is limited by the claims rather than the specification, and all changes within the scope defined by the claims or within the equivalent scope of the scope defined by the claims should be understood to be included in the claims. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coating scraper device for coating 3D printing material in a 3D printing device, It is characterized in that Equipped with: workbench unit, scraper unit and frame platform; The workbench unit has: A workbench for printing workpieces; A forming cylinder which is concavely mounted on the workbench and contains a workpiece to be formed; A forming cylinder driving mechanism capable of moving the forming cylinder a specified distance in a vertical direction perpendicular to the plane where the upper surface of the workbench is located; A material cylinder which is concavely mounted on the workbench and arranged in parallel with the forming cylinder and contains printing materials; and A cylinder driving mechanism capable of moving the cylinder in the up-down direction by a specified distance; The scraper unit moves horizontally along the plane where the upper surface of the workbench is located, and has: A coating scraper main body frame installed on the workbench unit and capable of moving along the parallel direction of the material cylinder and the forming cylinder; A scraper unit driving mechanism for driving the coating scraper main body frame to move horizontally along the plane where the upper surface of the workbench is located; Two coating scrapers are arranged in parallel in the coating scraper main body frame and move along the up and down directions by a specified distance respectively; A clutch cam mechanism installed on the coating scraper main body frame and connected to the two coating scrapers; and A clutch cam driving mechanism that drives the clutch cam mechanism to rotate so as to drive the two coating scrapers to move respectively in the up and down directions; The coating scraper is fixed to the coating scraper main body frame through an elastic member; The clutch cam mechanism comprises a follower and a cam; the cam is placed between the two coating scrapers and rotates under the drive of the clutch cam driving mechanism; one end of the follower is in relatively movably contact with the cam, and the other end is connected to the coating scraper or the elastic member; in The cam has a shape capable of causing the two coating scrapers to move up and down regularly, so that the two coating scrapers contact the upper surface of the workbench alternately.

2. The coating blade device according to claim 1, It is characterized in that The scraper unit further comprises: a pre-laying roller arranged parallel to the two coating scrapers and located between the two coating scrapers; and a pre-laying roller driving mechanism driving the pre-laying roller to rotate and / or move a predetermined distance in the up-down direction.

3. The coating blade device according to claim 1, It is characterized in that A pair of guide rails for moving the scraper unit are protrudingly provided on the upper surface of the workbench, and the pair of guide rails are formed on the workbench with the forming cylinder and the material cylinder sandwiched therebetween to form scraper grooves having a size corresponding to the width of the coating scraper.

4. The coating blade device according to claim 1, It is characterized in that The 3D printing material is ceramic paste, ceramic slurry, plastic powder, metal powder or wax powder.

5. The coating blade device according to claim 1, It is characterized in that The driving mechanism is a stepping motor or a driving motor.

6. The coating blade device according to claim 1, It is characterized in that The forming cylinder and the material cylinder have the same size.

7. A 3D printing device comprising the coating scraper device according to any one of claims 1 to 6.

Images