Double-scraper mechanism for SLS printing of sand mold
By designing a double scraper mechanism with a filter mesh and a narrow blade in an SLS printer, the problem of difficulty in laying powder materials with high fluidity is solved, and the anti-roll, disintegrating clumps and filtering functions are realized, which improves printing efficiency and reliability sex.
Patent Information
- Application Number
- CN202323564613.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2033-12-25
AI Technical Summary
The prior art is difficult to effectively lay powder materials with excessive fluidity, such as coated sand and metal powder, which can easily lead to the material layer powder being pushed away, the sand body rolling and the agglomerated powder being scraped, resulting in printing failure and waste. Cost and time.
A double scraper mechanism for sand-type SLS printing is designed, including a filter mesh, a funnel-shaped powder storage chamber and a narrow blade scraper. The filter mesh can filter out impurities and disperse clumps, narrow blades reduce friction and ensure uniform fine sand body. The fall, double scraper structure improves support and spreading effect.
Effectively prevent the material layer powder from being pushed away, the sand body rolled and the agglomerated powder balls being scraped, ensuring printing quality, reducing costs and operating complexity, adapting to various powder materials, and improving printing efficiency and reliability.
Smart Images
Figure CN222221070U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of 3D printer scrapers, in particular to a double scraper mechanism for sand mold SLS printing. Background Art
[0002] When industrial-grade SLS 3D printers are paving powders, scrapers with different structures are often used to achieve flat paving for powders with different characteristics. Among them, composite powders such as coated sand, a mixture of metal powder and organic binder powder have characteristics such as high fluidity and easy powder agglomeration. During the paving process of such materials, it is easy for the material layer powder to be pushed away, the sand body to roll, and the agglomerated powder agglomerates to be scraped off.
[0003] Although existing conventional scrapers can meet the leveling needs of most powders, they are often unable to effectively level materials with high fluidity such as coated sand and metal powder. It is easy for material layers to be pushed away, sand bodies to roll, and agglomerated powder to be scraped off, resulting in printing failures and a huge waste of cost and time.
[0004] Therefore, it is necessary to further improve and perfect the prior art to overcome these deficiencies, and the present invention is made based on this situation. Utility Model Content
[0005] The utility model aims to overcome the deficiencies of the prior art and provide a double scraper mechanism for sand mold SLS printing with the functions of anti-rolling, breaking up agglomerated sand bodies and filtering.
[0006] The utility model is realized by the following technical solutions:
[0007] In order to solve the above technical problems, the utility model provides a double scraper mechanism for sand mold SLS printing, including a scraper assembly, the scraper assembly includes a tool holder frame, a filter screen is provided on the top of the tool holder frame, and a left scraper and a right scraper are respectively provided on the left and right sides of the lower part of the tool holder frame, the right side surface of the left scraper and the left side surface of the right scraper are opposite to each other and form a funnel-shaped powder storage chamber located directly below the filter screen, and the blades of the left scraper and the right scraper are opposite to each other and form a powder outlet connected to the bottom of the powder storage chamber.
[0008] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein the right side surface of the left scraper is the left cavity wall, and the left cavity wall gradually decreases from left to right; the left side surface of the right scraper is the right cavity wall, and the right cavity wall gradually increases from left to right.
[0009] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein the blade of the left scraper is a left blade, and the left blade is arranged at the lower end of the left cavity wall and extends downward; the blade of the right scraper is a right blade, and the right blade is arranged at the lower end of the right cavity wall and extends downward; the left blade and the right blade are close to and spaced apart, and the gap between the two is a powder outlet.
[0010] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein the blade width A of the left blade and the right blade is no more than 1 mm.
[0011] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein the middle part of the filter screen is concave to form a net bag shape.
[0012] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, in which the filter screen is detachably connected to the tool holder frame, and the left and right sides of the top of the tool holder frame are respectively provided with a fixing plate for fixing the filter screen and a plurality of first fixing screws.
[0013] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein sand retaining plates are provided at both the front and rear ends of the tool holder frame.
[0014] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, in which the left scraper and the right scraper can be detachably installed on the tool holder frame, and a plurality of second fixing screws are provided between the left scraper and the tool holder frame and between the right scraper and the tool holder frame.
[0015] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein the double scraper mechanism also includes a powder supply box bottom plate, and the powder supply box bottom plate is provided with a driving system for driving the scraper assembly to move left and right to scrape the powder flat.
[0016] In order to further solve the technical problem to be solved by the utility model, the utility model provides a double scraper mechanism for sand mold SLS printing, wherein a roller assembly is provided at the front end of the scraper assembly, and a transmission guide rail that can cooperate with the roller assembly is provided on the bottom plate of the powder supply box.
[0017] Compared with the prior art, the utility model has the following advantages:
[0018] 1. In the utility model, the filter screen integrated on the scraper assembly plays a dual role. On the one hand, it can filter out impurities and large particles of sand, and on the other hand, it can break up the agglomerated sand, thereby ensuring that only fine sand that meets the requirements falls. After filtering and breaking up, these fine sands become smaller and less agglomerated, which can avoid the material layer powder being pushed away, the sand body rolling, and the agglomerated powder being scraped up during the scraping process. It is worth mentioning that this design makes the utility model highly adaptable and can handle powders of various materials, including composite materials such as coated sand, a mixture of metal powder and organic adhesive powder. This means that there is no need to replace scrapers with different structures according to different materials, which greatly simplifies the operation process and reduces costs.
[0019] 2. The powder storage chamber of the utility model is mainly used to temporarily store the filtered fine sand. Its design shape is funnel-shaped, and this shape is designed to ensure that the fine sand can fall evenly and slowly from the powder outlet. Moreover, the utility model directly uses the tool holder frame, the left scraper and the right scraper to enclose the powder storage chamber, without adding other complex structures, so the structure is simple and the cost is low.
[0020] 3. The left blade and the right blade of the utility model are close to each other and spaced apart, and the gap between them is the powder outlet. The structure in which the two scrapers are close to each other can spread the powder more evenly and reduce the waste of powder. In addition, the structure in which the two scrapers are close to each other can also reduce the rolling of the powder, making the powder more stable, which is beneficial to the printing effect. Moreover, the blade width A of the left blade and the right blade are designed to be very narrow, and are not greater than 1mm. This thin blade design can effectively reduce the friction between the sand body and the scraper, thereby reducing the possibility of sand body rolling. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:
[0022] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0023] Figure 2 is an exploded schematic diagram of the scraper assembly;
[0024] Figure 3 is a cross-sectional view of the scraper assembly. DETAILED DESCRIPTION
[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0026] like Figures 1 to 3A double scraper mechanism for sand mold SLS printing is shown, comprising a scraper assembly, the scraper assembly comprising a tool holder frame 1, a filter screen 2 is provided on the top of the tool holder frame 1, and a left scraper 3 and a right scraper 4 are provided on the left and right sides of the lower part of the tool holder frame 1. The right side surface of the left scraper 3 and the left side surface of the right scraper 4 are opposite to each other and enclose a funnel-shaped powder storage chamber 5 located directly below the filter screen 2, and the blades of the left scraper 3 and the right scraper 4 are opposite to each other and form a powder outlet 51 connected to the bottom of the powder storage chamber 5.
[0027] A powder supply system is usually provided above the scraper assembly, and the powder supply system supplies powder from top to bottom to the powder storage chamber 5. During the powder supply process, the sand body falls into the filter screen 2 by gravity, and then enters the powder storage chamber 5. In this process, the sand powder (sand body) first falls into the filter screen 2, and after being filtered and broken up by the filter screen, it becomes a finer and non-agglomerated fine sand body, and then enters the powder storage chamber 5 for temporary storage. When the scraper assembly moves left and right, the sand body in the powder storage chamber 5 gradually falls from the powder outlet 51 to the working plane. In this process, the blade of the left scraper 3 and the blade of the right scraper 4 move left and right, thereby scraping the falling sand body flat. The design of this scraper assembly makes the scraping process smoother and improves the paving effect.
[0028] In the utility model, the filter screen 2 integrated on the scraper assembly plays a dual role. On the one hand, it can filter out impurities and large particles of sand, and on the other hand, it can break up the agglomerated sand, thereby ensuring that only fine sand that meets the requirements falls. After filtering and breaking up, these fine sands become smaller and less agglomerated, which can avoid the material layer powder being pushed away, the sand body rolling, and the agglomerated powder being scraped up during the leveling process.
[0029] It is worth mentioning that the utility model directly integrates the filter screen 2 on the scraper assembly. This design makes the utility model highly adaptable and can process powders of various materials, including composite materials such as coated sand, a mixture of metal powder and organic binder powder. This means that there is no need to replace scrapers of different structures according to different materials, which greatly simplifies the operation process and reduces costs.
[0030] In addition, the structure of the utility model is relatively simple and has fewer parts, which makes the manufacturing cost of the utility model lower and also improves the convenience of its use.
[0031] The powder storage chamber 5 is mainly used to temporarily store the filtered fine sand. It is designed in a funnel shape, and this shape is designed to ensure that the fine sand can fall evenly and slowly from the powder outlet 51. First, the funnel shape can keep a certain pressure on the fine sand in the powder storage chamber to avoid rapid falling due to gravity, thereby ensuring the stability of the paving process. Secondly, the funnel-shaped design also allows the fine sand to flow out evenly from the powder outlet 51, avoiding paving problems caused by uneven speed. At the same time, this design can also prevent excessive accumulation of fine sand in the powder storage chamber, thereby ensuring the smoothness of the entire paving process. The design of the powder storage chamber 5 can not only improve the paving efficiency, but also reduce problems that may occur during the paving process, such as material waste or printing failure, further improving the efficiency and reliability of industrial-grade SLS 3D printers.
[0032] More specifically, Figure 2 , Figure 3 As shown, the right side of the left scraper 3 is the left cavity wall 31 of the powder storage cavity 5, and the left cavity wall 31 gradually decreases from left to right; the left side of the right scraper 4 is the right cavity wall 41 of the powder storage cavity 5, and the right cavity wall 41 gradually increases from left to right. With this design, the blade frame 1, the left scraper 3 and the right scraper 4 can be directly used to enclose the powder storage cavity 5 without adding other complex structures, so the structure is simple and the cost is low.
[0033] More specifically, the blade of the left scraper 3 is a left blade 32, which is disposed at the lower end of the left cavity wall 31 and extends downward; the blade of the right scraper 4 is a right blade 42, which is disposed at the lower end of the right cavity wall 41 and extends downward. The utility model adopts a double scraper structure, which can provide better support during printing, preventing powder from collapsing during printing and affecting the printing effect.
[0034] The left blade 32 and the right blade 42 are close to each other and spaced apart, and the gap between them is a powder outlet 51. The structure of the two scrapers close to each other can spread the powder more evenly and reduce the waste of powder. In addition, the structure of the two scrapers close to each other can also reduce the rolling of the powder, making the powder more stable, which is beneficial to the printing effect.
[0035] The design of the powder outlet 51 allows the fine sand to flow out evenly and slowly, ensuring the smooth progress of the paving process. At the same time, this design also makes the scraping process smoother and improves work efficiency.
[0036] More specifically, the blade width A of the left blade 32 and the right blade 42 is no greater than 1 mm. The blade width A of the left blade 32 and the right blade 42 are both designed to be very narrow, and are no greater than 1 mm. This thin blade design can effectively reduce the friction between the sand body and the scraper, thereby reducing the possibility of the sand body rolling. At the same time, this design can also improve the sensitivity of the scraper, making the scraping process more accurate and improving the paving effect.
[0037] More specifically, the middle portion of the filter screen 2 is concave to form a net bag shape. Such a structure is to allow the filter screen 2 to temporarily accommodate more sand bodies, thereby preventing the accumulated sand bodies in the filter screen 2 from overflowing and affecting the printing quality.
[0038] More specifically, the filter 2 is detachably connected to the tool holder frame 1, and a fixing plate 11 and a plurality of first fixing screws 12 for fixing the filter 2 are respectively provided on the left and right sides of the top of the tool holder frame 1. The filter 2 is detachably connected to the tool holder frame 1, and such a design not only makes the installation of the filter 2 more convenient, but also facilitates the removal and replacement of the filter 2. When the filter 2 needs to be replaced, the user only needs to remove the first fixing screws 12 and the fixing plate 11 to easily remove the filter 2 from the tool holder frame 1. Such a design not only improves work efficiency, but also reduces maintenance costs and unnecessary troubles. In addition, the design of the filter 2 also takes into account its durability and easy cleaning, so that the service life of the filter 2 is longer and cleaning is more convenient.
[0039] More specifically, the front and rear ends of the tool holder frame 1 are both provided with sand retaining plates 6. The function of the sand retaining plates 6 is mainly to prevent sand from accumulating and overflowing from both sides of the tool holder frame 1 during printing, thereby ensuring the smooth progress of the printing process and the stability of the printing quality.
[0040] More specifically, the left scraper 3 and the right scraper 4 can be detachably mounted on the tool holder frame 1, and a plurality of second fixing screws 13 are provided between the left scraper 3 and the tool holder frame 1, and between the right scraper 4 and the tool holder frame 1. Such a design allows the left scraper 3 and the right scraper 4 to be detachable and replaceable, so as to adapt to different powder types and reduce maintenance costs.
[0041] More specifically, Figure 1 As shown, the double scraper mechanism also includes a powder supply box bottom plate 7, and a driving system 8 for driving the scraper assembly to move left and right to scrape the powder is provided on the powder supply box bottom plate 7. The driving system 8 is usually a ball screw sliding module, which will not be described here.
[0042] More specifically, the front end of the scraper assembly is provided with a roller assembly 9, and the powder supply box bottom plate 7 is provided with a transmission guide rail 71 that can cooperate with the roller assembly 9. The cooperation structure of the roller assembly 9 and the transmission guide rail 71 is to enable the scraper assembly to slide smoothly left and right.
[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A double scraper mechanism for sand mold SLS printing, characterized by: The scraper assembly comprises a blade frame (1), a filter screen (2) is arranged on the top of the blade frame (1), a left scraper (3) and a right scraper (4) are arranged on the left and right sides of the lower part of the blade frame (1), the right side surface of the left scraper (3) and the left side surface of the right scraper (4) are opposite to each other and form a funnel-shaped powder storage chamber (5) located directly below the filter screen (2), and the blades of the left scraper (3) and the right scraper (4) are opposite to each other and form a powder outlet (51) connected to the bottom of the powder storage chamber (5).
2. A double scraper mechanism for sand mold SLS printing according to claim 1, characterized in that: The right side surface of the left scraper (3) is a left cavity wall (31), and the left cavity wall (31) gradually decreases from left to right; the left side surface of the right scraper (4) is a right cavity wall (41), and the right cavity wall (41) gradually increases from left to right.
3. A double scraper mechanism for sand mold SLS printing according to claim 2, characterized in that: The blade of the left scraper (3) is a left blade (32), which is arranged at the lower end of the left cavity wall (31) and extends downward; the blade of the right scraper (4) is a right blade (42), which is arranged at the lower end of the right cavity wall (41) and extends downward; the left blade (32) and the right blade (42) are close to and spaced apart from each other, and a gap between the two is a powder outlet (51).
4. A double scraper mechanism for sand mold SLS printing according to claim 3, characterized in that: The blade width A of the left blade (32) and the right blade (42) is no greater than 1 mm.
5. The double scraper mechanism for sand mold SLS printing according to claim 1, characterized in that: The middle part of the filter net (2) is concave so as to form a net bag shape.
6. A double scraper mechanism for sand mold SLS printing according to claim 1, characterized in that: The filter screen (2) is detachably connected to the tool holder frame (1), and a fixing plate (11) and a plurality of first fixing screws (12) for fixing the filter screen (2) are respectively provided on the left and right sides of the top of the tool holder frame (1).
7. A double scraper mechanism for sand mold SLS printing according to claim 1, characterized in that: Sand retaining plates (6) are provided at both the front and rear ends of the tool holder frame (1).
8. The double scraper mechanism for sand mold SLS printing according to claim 1, characterized in that: The left scraper (3) and the right scraper (4) can be detachably mounted on the tool holder frame (1), and a plurality of second fixing screws (13) are provided between the left scraper (3) and the tool holder frame (1), and between the right scraper (4) and the tool holder frame (1).
9. The double scraper mechanism for sand mold SLS printing according to claim 1, characterized in that: The double scraper mechanism also includes a powder supply box bottom plate (7), and a driving system (8) for driving the scraper assembly to move left and right to scrape the powder flat is provided on the powder supply box bottom plate (7).
10. A double scraper mechanism for sand mold SLS printing according to claim 9, characterized in that: A roller assembly (9) is provided at the front end of the scraper assembly, and a transmission guide rail (71) capable of cooperating with the roller assembly (9) is provided on the bottom plate (7) of the powder supply box.