Scraper powder sweeping device

Abstract

The utility model belongs to the field of additive manufacturing, and relates to a scraper powder sweeping device which comprises a first powder sweeping device, and the first powder sweeping device comprises a fixing support, a mounting plate and a brush. The mounting plate is arranged on the fixed bracket; the mounting plate and the fixed bracket are integrally 7-shaped or Z-shaped; and the brush extends outwards along the top of the mounting plate. The utility model provides the scraper powder sweeping device which is adjustable in posture and can effectively ensure the powder sweeping effect.

Description

Technical Field

[0001] The utility model belongs to the field of additive manufacturing and relates to a scraper powder sweeping device, in particular to a scraper powder sweeping device for 3D printing equipment. Background Art

[0002] SLM metal 3D printing technology is currently widely used in aerospace, biomedicine, military, construction, automobile, jewelry, mold and other industries. It has absolute cost and cycle advantages in complex structural parts, small batch customized parts, and high-performance, high-strength parts. During printing, a scraper is usually used to spread the powder onto the printing plane for printing. Spreading powder requires the use of a scraper to spread the powder into a uniform specified thickness; printing is to use a laser to quickly melt the powder under certain conditions (temperature, oxygen content and other external factors), so as to achieve the melting and forming of the powder selection area. However, the scraper is prone to sticking to the powder after spreading the powder. During the scraper's return stroke or reverse powder spreading process, the powder is easy to fall onto the printing plane, resulting in a change in the energy density of the powder falling area during melting, which seriously affects the performance, surface effect and internal quality of the part, and may even cause the part to be scrapped.

[0003] The utility model with authorization announcement number 217749349U discloses a scraper powder cleaning device and a powder spreading device for 3D printing, wherein the scraper powder cleaning device includes a self-driving member and a powder cleaning sheet arranged at the end of the self-driving member; the self-driving member drives the powder cleaning sheet to move. Figure 1 as well as Figure 2 As shown, this patent utilizes the left-right movement of the scraper to apply pressure to the self-driving member, causing it to bend and deform, thereby cleaning the scraping surface of the scraper, while also utilizing the elastic reset of the self-driving member. However, in the technical solution provided by this utility model, the position of the self-driving member is fixed, and its angle and height cannot be adjusted. If the self-driving member is damaged or worn due to long-term movement, it cannot effectively remove powder from the scraper, and the powder removal effect is difficult to guarantee.

[0004] like Figure 3 As shown, there is also a solution in the prior art of fixing a brush at the bottom of the powder dropping hole plate and sweeping the powder on the scraper with the brush, that is, the brush is fixed vertically below the powder dropping hole plate, and when the scraper moves to the left, the brush can bend and deform left and right, thereby cleaning the powder on the back of the scraper. This technical solution has the following shortcomings: 1) The brush moves back and forth at the same position, which can easily cause damage to the end of the brush and easily fail during operation, causing the risk of powder falling from the scraper; 2) When the surface of the brush is worn or damaged, since the height and angle of the brush still cannot be adjusted, there is a possibility of missing the brush, and the powder sweeping effect is still difficult to guarantee. Utility Model Content

[0005] In order to solve the above technical problems existing in the background technology, the utility model provides a scraper powder sweeping device with adjustable posture and effective powder sweeping effect.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A scraper powder sweeping device, characterized in that: the scraper powder sweeping device includes a first powder sweeping device, the first powder sweeping device includes a fixed bracket, a mounting plate and a brush; the mounting plate is arranged on the fixed bracket; the mounting plate and the fixed bracket are overall in a 7-shape or a Z-shape; the brush extends outward along the top of the mounting plate.

[0008] The mounting plate and the fixing bracket are of an integrated structure or a split structure; the angle between the mounting plate and the fixing bracket is an obtuse angle.

[0009] When the above-mentioned mounting plate and fixed bracket are split structures, the scraper powder sweeping device also includes a hinge and an angle adjustment rod; the mounting plate is connected to the fixed bracket through the hinge; the angle adjustment rod is placed between the fixed bracket and the mounting plate.

[0010] One end of the angle adjustment rod is movably arranged on the mounting plate or the fixed bracket, or both ends of the angle adjustment rod are movably arranged on the mounting plate and the fixed bracket.

[0011] The mounting plate and / or the fixing bracket are provided with an elongated hole, and the angle adjustment rod is placed in the elongated hole and can move freely along the axial direction of the elongated hole.

[0012] The above-mentioned elongated hole is provided with steps along the axial direction of the elongated hole.

[0013] The above-mentioned scraper powder sweeping device also includes a top screw or a connecting bolt arranged at the end of the angle adjustment rod.

[0014] The above-mentioned scraper powder sweeping device also includes an adjustment plate movably arranged on the fixed bracket along the axial direction of the fixed bracket; the mounting plate is connected to the adjustment plate through a hinge; and the angle adjustment rod is placed between the adjustment plate and the mounting plate.

[0015] The back of the adjustment plate is provided with a connecting piece along the axial direction of the adjustment plate, and the belly of the adjustment plate is provided with a working groove along the axial direction of the adjustment plate; the adjustment plate is movably set on the fixed bracket through the connecting piece; one end of the angle adjustment rod is placed in the working groove; the connecting piece is a mortise and tenon connecting piece, and the cross-section of the connecting piece is rectangular, dovetail or C-shaped.

[0016] The above-mentioned scraper powder sweeping device further includes a second powder sweeping device, the structure of the second powder sweeping device is the same as that of the first powder sweeping device; the second powder sweeping device is arranged opposite to the first powder sweeping device.

[0017] The advantages of the utility model are:

[0018] The utility model provides a scraper powder sweeping device, comprising a first powder sweeping device, the first powder sweeping device comprising a fixed bracket, a mounting plate, and a brush; the mounting plate being mounted on the fixed bracket; the mounting plate and the fixed bracket forming a 7-shaped or Z-shaped structure; and the brush extending outward from the top of the mounting plate. By adjusting the vertical height and setting angle of the fixed bracket and the mounting plate, the height and tilt angle of the brush mounted on the mounting plate can be adjusted. This can meet the scraper powder sweeping requirements of different scraper types and equipment models. The force generated by the movement of the brush tip and the scraper can be continuously varied. Specifically, the smaller the angle between the brush tip and the scraper surface, the smaller the reaction force on the brush. This allows the brush to be squeezed and deformed, making the brush tip less susceptible to damage, extending its service life, and effectively ensuring effective powder sweeping. Furthermore, the utility model allows the selection of a brush of appropriate length to achieve full coverage of the scraper back. Clearly, the utility model has the advantages of adjustable brush posture, effective powder sweeping, strong feasibility, simple structure, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 、 Figure 2 as well as Figure 3 They are respectively structural schematic diagrams of the self-driven scraper powder cleaning device used in the prior art;

[0020] Figure 4 This is a schematic structural diagram of the scraper powder sweeping device provided by the utility model;

[0021] Figure 5 This is a structural diagram of the integrated scraper powder sweeping device provided by the utility model;

[0022] exist Figure 4 as well as Figure 5 middle:

[0023] 1-Fixed bracket; 2-Adjustment plate; 3-Angle adjustment rod; 4-Hinge; 5-Mounting plate; 6-Brush; 7-Scraper; 8-Orifice plate; 9-Powder drop bin. DETAILED DESCRIPTION

[0024] See also Figure 4To adjust the height and angle of the brush, the present invention provides a scraper powder sweeping device comprising a first powder sweeping device, comprising a fixed bracket 1, a mounting plate 5, and a brush 6. The mounting plate 5 is mounted on the fixed bracket 1; the mounting plate 5 and the fixed bracket 1 form a 7-shaped or Z-shaped structure. Preferably, the angle between the mounting plate 5 and the fixed bracket 1 is obtuse. For example, when the fixed bracket 1 is a columnar or plate-shaped structure, the mounting plate 5 is tilted downwardly on the fixed bracket 1, forming a 7-shaped structure. When the fixed bracket 1 has an overall L-shaped cross-section, the mounting plate 5 is tilted downwardly on the fixed bracket 1, forming a Z-shaped structure. Regardless of whether the shape is 7-shaped or Z-shaped, the brush 6 extends outward from the top of the mounting plate 5 along the axis of the upper surface of the mounting plate 5, i.e., extends obliquely downward. As the scraper 7 moves across the orifice plate 8, it gradually contacts the brush 6 and sweeps the powder off the scraper 7. This process is identical to the existing cleaning process and will not be further described here. When the utility model is in use, the fixing bracket 1 can be set on the orifice plate 8. Since the brush 6 is tilted downward, that is, it forms a certain angle with the horizontal plane, when the height or angle of the brush 6 needs to be adjusted, it can be achieved by adjusting the relative posture of the mounting plate 5 and the fixing bracket 1.

[0025] For example, the overall structure formed by the mounting plate 5 and the fixing bracket 1 is an integrated structure or a split structure. Figure 5 , is the integrated structure adopted by the present invention. Of course, the integrated structure can be multiple pieces. For example, the mounting plate 5 is at different heights and different inclination angles of the fixed bracket 1. For example, the overall structure one is that the mounting plate 5 is located on the fixed bracket 1 and the angle with the horizontal plane is 30°, and the height of the downwardly inclined end of the mounting plate 5 from the horizontal plane is 10 cm; the overall structure two is that the mounting plate 5 is located on the fixed bracket 1 and the angle with the horizontal plane is 25°, and the height of the downwardly inclined end of the mounting plate 5 from the horizontal plane is 8 cm.

[0026] Of course, in order to be able to adjust more flexibly, more split structures are used, such as Figure 4 As shown. The scraper powder sweeping device employed in the present invention also includes a hinge 4 and an angle adjustment rod 3. The mounting plate 5 is connected to the fixed bracket 1 via the hinge 4. The angle adjustment rod 3 is supported between the fixed bracket 1 and the mounting plate 5. Due to the presence of the hinge 4, the fixed bracket 1 and the mounting plate 5 can rotate about the hinge 4's axis, adjusting the relative distance between the fixed bracket 1 and the mounting plate 5 according to actual working conditions. This, in turn, changes the downward tilt angle of the mounting plate 5, ensuring effective powder removal by the brush 6.

[0027] Exemplarily, one end of the angle adjustment rod 3 is movably provided on the mounting plate 5 or the fixed bracket 1 , or both ends of the angle adjustment rod 3 are movably provided on the mounting plate 5 and the fixed bracket 1 .

[0028] To ensure the position of the angle adjustment rod 3, the mounting plate 5 and / or the fixed bracket 1 provided by the present invention are provided with an elongated hole. The angle adjustment rod 3 is placed in the elongated hole and can move freely along the axis of the elongated hole. The elongated hole restricts the position of the angle adjustment rod 3, ensuring good stability during the powder cleaning process.

[0029] Generally speaking, the elongated hole can be a groove of the same depth. Of course, the elongated hole can also be provided with a step along the axial direction of the elongated hole. The step allows both ends of the angle adjustment rod 3 to be better stuck in the elongated hole, further ensuring the position stability of the angle adjustment rod 3.

[0030] To further define the position of the angle adjustment rod 3, the scraper powder sweeping device provided by the present invention also includes a jackscrew or connecting bolt disposed at the end of the angle adjustment rod 3. During use, the angle adjustment rod 3 is first adjusted to its proper position, and then secured to the mounting plate 5 and / or fixed bracket 1 using the jackscrew or connecting bolt. To adjust the relative distance between the mounting plate 5 and fixed bracket 1, the jackscrew or connecting bolt is loosened, the angle adjustment rod 3 is adjusted to its proper position, and then secured using the jackscrew and connecting bolt.

[0031] To adjust the height of the brush 6, the scraper powder sweeping device provided by the present invention also includes an adjustment plate 2 movably mounted on the fixed bracket 1 along its axial direction; a mounting plate 5 connected to the adjustment plate 2 via a hinge 4; and an angle adjustment rod 3 positioned between the adjustment plate 2 and the mounting plate 5. Because the adjustment plate 2 can freely move along the axial direction (i.e., height direction) of the fixed bracket 1, the height between the mounting plate 5 and the fixed bracket 1 can be adjusted, and the height of the brush 6 mounted on top of the mounting plate 5 can be adjusted accordingly.

[0032] Exemplarily, a connector is provided on the back of the adjustment plate 2 along its axial direction, and a working groove is provided on the belly of the adjustment plate 2 along its axial direction. The adjustment plate 2 is movably mounted on the fixed bracket 1 via the connector. One end of the angle adjustment rod 3 is positioned in the working groove. The connector can be a conventional mortise and tenon structure, with a rectangular, dovetail, or C-shaped cross-section. Exemplarily, the connector can be a ridge provided on the back of the adjustment plate 2, and a groove is provided on the fixed bracket 1 that matches the ridge. The two are connected via the ridge and groove.

[0033] In order to further improve the powder cleaning effect, the scraper powder sweeping device provided by the present invention also includes a second powder sweeping device, the structure of the second powder sweeping device is the same as that of the first powder sweeping device; the second powder sweeping device is arranged opposite to the first powder sweeping device.

[0034] by Figure 4Taking the structure shown as an example (assuming that the scraper 7 moves to the left), the technical solution provided by the utility model is described in detail:

[0035] When the present invention is used, a certain amount of powder will accumulate at the lower end of the powder bin 9, and at the same time, a certain amount of powder will stick to the back of the scraper 7 as the scraper 7 moves to the left. When the scraper 7 moves to the left to the position of the orifice plate 8, the back of the scraper 7 will contact the brush 6. If it continues to move to the left for a certain distance, the brush 6 will be squeezed by the back of the scraper 7. Since the upper surface of the mounting plate 5 on which the brush 6 is provided is tilted downward, the brush 6 will simultaneously bend downward and deform, contacting the powder on the back of the scraper 7 and generating relative displacement. The powder on the back of the scraper 7 will fall off, thereby achieving the purpose of cleaning the powder on the back of the scraper 7. On this basis, the relationship between the adjustment plate 2, the angle adjustment rod 3 and the installation position of the brush 6 (i.e., changing the height and angle) can be adaptively adjusted to achieve or meet the powder sweeping needs of equipment of different specifications and models and different types of scrapers, thereby ensuring the effect of cleaning the powder.

Claims

1. A scraper powder sweeping device, characterized in that: The scraper powder sweeping device comprises a first powder sweeping device, which comprises a fixed bracket (1), a mounting plate (5) and a brush (6); the mounting plate (5) is arranged on the fixed bracket (1); the mounting plate (5) and the fixed bracket (1) are integrally formed in a 7-shaped or Z-shaped configuration; the brush (6) extends outward along the top of the mounting plate (5).

2. The scraper powder sweeping device according to claim 1, characterized in that: The included angle between the mounting plate (5) and the fixing bracket (1) is an obtuse angle; the mounting plate (5) and the fixing bracket (1) are an integrated structure or a split structure.

3. The scraper powder sweeping device according to claim 2, characterized in that: When the mounting plate (5) and the fixed bracket (1) are of a split structure, the scraper powder sweeping device further comprises a hinge (4) and an angle adjustment rod (3); the mounting plate (5) is connected to the fixed bracket (1) via the hinge (4); and the angle adjustment rod (3) is placed between the fixed bracket (1) and the mounting plate (5).

4. The scraper powder sweeping device according to claim 3, characterized in that: One end of the angle adjustment rod (3) is movably arranged on the mounting plate (5) or the fixed bracket (1), or both ends of the angle adjustment rod (3) are movably arranged on the mounting plate (5) and the fixed bracket (1).

5. The scraper powder sweeping device according to claim 4, characterized in that: The mounting plate (5) and / or the fixing bracket (1) are provided with an elongated hole, and the angle adjustment rod (3) is placed in the elongated hole and moves freely along the axial direction of the elongated hole.

6. The scraper powder sweeping device according to claim 5, characterized in that: The elongated hole is provided with steps along the axial direction of the elongated hole.

7. The scraper powder sweeping device according to claim 6, characterized in that: The scraper powder sweeping device further comprises a top screw or a connecting bolt arranged at the end of the angle adjustment rod (3).

8. The scraper powder sweeping device according to any one of claims 3 to 7, characterized in that: The scraper powder sweeping device further comprises an adjustment plate (2) movably arranged on the fixed bracket (1) along the axial direction of the fixed bracket (1); the mounting plate (5) is connected to the adjustment plate (2) via a hinge (4); and the angle adjustment rod (3) is placed between the adjustment plate (2) and the mounting plate (5).

9. The scraper powder sweeping device according to claim 8, characterized in that: The back of the adjustment plate (2) is provided with a connecting piece along the axial direction of the adjustment plate (2), and the belly of the adjustment plate (2) is provided with a working groove along the axial direction of the adjustment plate (2); the adjustment plate (2) is movably arranged on the fixed bracket (1) through the connecting piece; one end of the angle adjustment rod (3) is placed in the working groove; the connecting piece is a mortise and tenon connecting piece, and the cross section of the connecting piece is rectangular, dovetail-shaped or C-shaped.

10. The scraper powder sweeping device according to claim 9, characterized in that: The scraper powder sweeping device further includes a second powder sweeping device, the structure of the second powder sweeping device is the same as that of the first powder sweeping device; the second powder sweeping device is arranged opposite to the first powder sweeping device.

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