Scraper assembly, powder laying device and additive printing equipment

Abstract

The invention discloses a scraper assembly, a powder laying device and additive printing equipment, and belongs to the technical field of additive printing. The scraper assembly comprises a knife rest and a scraper, the knife rest comprises a knife holder used for installing the scraper, the two sides and the top of the head of the knife holder are provided with a side inclined face and a top inclined face which incline towards the tail of the knife holder, the included angle between the side inclined face and the side face of the knife holder is 15-60 degrees, and the included angle between the top inclined face and the powder laying plane is 15-60 degrees; and the scraper is mounted on the tool apron. According to the scraper assembly, the powder laying device and the additive printing equipment, through the design of the inclined side inclined face and the top inclined face on the scraper holder, disturbance of reciprocating motion of the scraper frame in the forming cavity to a wind field can be reduced, the powder distribution uniformity in the powder laying process is ensured, and the powder laying efficiency is improved. And the problems of poor laser melting, overlarge surface roughness and the like caused by non-uniform powder layers can be effectively avoided.

Description

Technical Field

[0001] The present application belongs to the field of additive printing technology, and specifically relates to a scraper assembly, a powder spreading device and additive printing equipment. Background Art

[0002] In the process of metal powder bed additive manufacturing, powder laying quality is one of the key factors that determine the quality of printing and manufacturing. Powder laying quality directly affects the uniformity of the powder bed, the quality of the subsequent laser melting layer, and the surface roughness of the final molded product. Therefore, how to improve the powder laying quality and ensure the uniformity and density of the powder layer has become a technical problem that needs to be solved in powder bed additive manufacturing.

[0003] In the prior art, scrapers, as the core equipment in the powder spreading process, are widely used in powder bed printers to spread the powder evenly on the printing platform. During the powder bed printing process, the printing area needs to be continuously purged of smoke and byproducts to ensure the clarity of the laser scanning process. However, the reciprocating movement of the scraper holder in the molding chamber will affect the wind field on the surface of the powder layer, especially near the scraper holder, where light powder is blown up by the airflow, resulting in a decrease in the local powder stacking density. The interference of the wind field not only weakens the dense stacking effect of fine powder, but also may cause irregular fluctuations on the surface of the powder layer, resulting in local uneven thickness. Since the scraper holder cannot avoid these wind field disturbances during the powder spreading process, the final powder spreading quality is uneven, which affects the accuracy of subsequent laser melting and the surface quality of the final molded part.

[0004] Therefore, it is necessary to provide a new solution to the above technical problems. Summary of the invention

[0005] The purpose of the present application is to provide a scraper assembly, a powder spreading device and an additive printing device, which can improve the powder spreading quality.

[0006] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0007] In the first aspect, the present application provides a scraper assembly for spreading powder, the scraper assembly comprising a blade holder and a scraper; the blade holder comprises a blade seat for mounting the scraper, the sides and top of the blade seat head are provided with side bevels and top bevels inclined toward the tail of the blade seat, the angle between the side bevels and the side faces of the blade seat is 15 to 60°, the angle between the top bevel and the powder spreading plane is 15 to 60°; the scraper is mounted on the blade seat.

[0008] In one or more embodiments, the knife seat includes a seat body, a mounting member and a pressing member, the mounting member is adjustably mounted on the seat body, and the pressing member is fixedly mounted on the mounting member.

[0009] In one or more embodiments, the mounting member and the pressing member are provided with mounting grooves, and the scraper is clamped in the mounting grooves.

[0010] In one or more embodiments, a first adjusting bolt and a second adjusting bolt are threadedly connected to the seat body, and one end of the first adjusting bolt and the second adjusting bolt passes through the seat body and respectively abuts against the top surfaces of both end portions of the mounting member.

[0011] In one or more embodiments, a first vibrator is disposed on the base, and the first vibrator penetrates the base.

[0012] In one or more embodiments, the base body is provided with a mounting hole extending from the rear portion toward the head portion thereof, and the first vibrator is arranged in a long strip shape and penetrates through the mounting hole.

[0013] In one or more embodiments, the tool holder also includes an inclined beam arranged on the top of the tool seat, the inclined beam is inclined from the head toward the tail of the tool seat, and wind-breaking slopes are provided on both sides of the inclined beam. The inclination of the wind-breaking slope is 15 to 60°, and the inclination of the wind-breaking slope is smaller than the inclination of the side slope.

[0014] In one or more embodiments, the angle between the two side surfaces of the oblique beam is 6-10°, and the width of the oblique beam gradually decreases from front to back.

[0015] In a second aspect, the present application provides a powder spreading device, which includes a forming cylinder and the aforementioned scraper assembly, wherein the scraper assembly is used to spread the powder in the forming cylinder.

[0016] In one or more embodiments, a second vibrator for vibrating the cylinder body is disposed on the cylinder body of the forming cylinder.

[0017] In a third aspect, the present application provides an additive printing device, which includes the aforementioned powder spreading device.

[0018] Compared with the prior art, the scraper assembly, powder spreading device and additive printing equipment provided in the present application can reduce the disturbance of the wind field caused by the reciprocating motion of the scraper holder in the molding cavity through the inclined side slope and top slope design on the blade holder, ensure the uniformity of powder distribution during the powder spreading process, and effectively avoid problems such as poor laser melting and excessive surface roughness caused by uneven powder layer; the vibrator equipped in the scraper assembly enhances the density of the powder through micro-disturbance, avoiding printing defects caused by too loose powder layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a scraper assembly in one embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the scraper assembly from another perspective;

[0022] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0023] Figure 4 for Figure 1 A front view of the scraper assembly shown;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of a first vibrator in one embodiment of the present application;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of a forming cylinder in one embodiment of the present application.

[0026] Description of main reference numerals:

[0027] 1-tool holder, 11-tool seat, 111-side slope, 112-top slope, 113-seat body, 114-mounting piece, 115-pressing piece, 116-mounting groove, 117-mounting hole, 121-first adjusting bolt, 122-second adjusting bolt, 13-first vibrator, 14-inclined beam, 141-wind-breaking slope, 2-scraper, 3-forming cylinder, 31-second vibrator. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0029] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0030] With the continuous development of metal powder bed additive manufacturing technology, powder spreading quality has become one of the key factors affecting printing quality. In the prior art, the scraper assembly failed to effectively control the influence of the wind field during the powder spreading process, resulting in poor density and uniformity of the powder layer, which in turn affects the fusion quality after laser melting and the surface roughness of the final molded layer. Specifically, the traditional scraper design often ignores the interference of the scraper holder 1 on the wind field, causing local powder to be blown up, affecting the stability of the powder layer, and causing irregular fluctuations on the surface of the powder layer, resulting in problems such as uneven thickness and uneven powder spreading.

[0031] The technical implementation idea of ​​the present application is based on the analysis of the existing technical problems, and proposes a solution to reduce wind field disturbance and improve powder spreading quality by optimizing the structural design of the scraper assembly. The core of this solution is to control the impact of the movement of the scraper frame on the wind field through the reasonable structural design of the blade holder, especially the inclined design of the blade seat. Specifically, the present application sets inclined side bevels and top bevels on both sides and the top of the blade seat of the blade holder to guide the wind flow along the surface of the scraper frame, thereby reducing the interference of the wind field on the powder layer. This design not only helps to reduce the floating phenomenon of light powder, but also maintains the uniformity and density of the powder layer, avoiding the problem of local uneven thickness due to wind flow interference.

[0032] In addition, the present application also considers the adjustability and structural optimization of the scraper assembly, and proposes a combination of adjusting the scraper angle and vibration control. This design enables the scraper assembly to not only effectively flatten the powder layer, but also ensure the uniform thickness of the powder layer, thereby providing a more stable foundation for subsequent laser melting. By reasonably adjusting the inclination and vibration mode of the scraper, it can adapt to the needs of different powder types and printing processes, thereby providing higher flexibility and reliability in practical applications.

[0033] Please refer to Figure 1 , Figure 2 and Figure 4 As shown, the scraper assembly in one embodiment of the present application includes a blade holder 1 and a scraper 2. The blade holder 1 includes a blade seat 11 for mounting the scraper 2. The sides and top of the blade seat 11 are provided with side slopes 111 and top slopes 112 inclined toward the tail of the blade seat 11. The angle between the side slope 111 and the side surface of the blade seat 11 is 15-60°, and the angle between the top slope 112 and the powder spreading plane is 15-60°. The scraper 2 is mounted on the blade seat 11.

[0034] The blade holder 1 is a supporting structure of the scraper assembly, and its main function is to provide a fixed installation position for the scraper 2, and to ensure that the scraper 2 can maintain the required working angle during the powder spreading process. The blade holder 1 is composed of a blade seat 11, and the head of the blade seat 11 is designed with two side slopes 111 and a top slope 112, which are inclined toward the rear of the blade seat 11, respectively, to form a favorable wind guide effect.

[0035] Inclined side slopes 111 are provided on both sides of the head of the blade holder 11. The angles between these slopes and the side surfaces of the blade holder 11 are set to be 15° to 60°. The design of this angle range ensures that when the scraper holder 1 moves, the air flow can be guided along the slopes to reduce the local disturbance of the wind flow. The function of the side slopes 111 is to avoid the collision and irregular flow of air and the scraper holder 1 by guiding the wind flow, thereby reducing the impact of wind field disturbance on the powder layer. During the powder spreading process, the distribution uniformity and density of the powder are affected by the wind field. The design of the side slopes 111 effectively reduces the disturbance of the wind field caused by the reciprocating motion of the scraper holder 1, and avoids the phenomenon of powder scattering or light powder floating.

[0036] The top of the knife holder 11 is designed with a top slope 112 inclined toward the powder spreading plane, and the angle between the top slope 112 and the powder spreading plane is also set to 15° to 60°. This design not only helps to further guide the wind flow, but also can reduce the friction between the knife holder 1 and the air flow during the powder spreading process, and improve the movement stability of the knife holder 1. The function of the top slope 112 is to avoid the influence of irregular fluctuations of the wind field on the powder spreading surface by adjusting the direction of the wind flow, and ensure that the powder layer can be evenly and evenly covered on the working surface.

[0037] The scraper 2 is mounted on the blade holder 11, and the support and fixed position provided by the blade holder 11 enable the scraper 2 to maintain a stable motion trajectory during operation. The design of the scraper 2 usually takes into account the contact angle and speed with the powder to ensure the accuracy and stability of the powder spreading effect. The scraper 2 is combined with the blade holder 11 to ensure that the scraper 2 can move smoothly along the specified trajectory during the powder spreading process, thereby achieving uniform and accurate powder spreading.

[0038] In an exemplary embodiment, please refer to Figures 1 to 4 As shown, the blade holder 11 includes a seat body 113, a mounting member 114 and a pressing member 115. The mounting member 114 is adjustably mounted on the seat body 113, and the pressing member 115 is fixedly mounted on the mounting member 114. The mounting member 114 and the pressing member 115 are provided with a mounting groove 116, and the scraper 2 is clamped in the mounting groove 116.

[0039] The seat 113 is the base of the blade holder 11, providing overall support and structural stability. The seat 113 is designed with strength and rigidity in mind, ensuring that the scraper 2 can maintain an appropriate working angle during use and withstand the pressure generated when the scraper 2 contacts the powder. The size and shape of the seat 113 are usually designed according to the specifications of the scraper 2 and the use environment, ensuring a close fit with other components to avoid errors or damage caused by instability or looseness.

[0040] The mounting member 114 is a component that connects the blade holder 11 and the scraper 2. Its main function is to provide an adjustment mechanism so that the scraper 2 can be precisely adjusted as needed. The mounting member 114 is adjustably mounted on the seat 113. This adjustable design allows the angle and position of the scraper 2 to be fine-tuned according to actual use requirements to adapt to powders of different thicknesses or types, ensuring the optimization of the powder spreading effect. The connection structure between the mounting member 114 and the seat 113 is designed so that it can be adjusted in time during the use of the scraper 2, so that the scraping angle or scraping depth of the scraper 2 is maintained in a better state, avoiding the influence of the powder spreading quality due to the fixed angle being too high or too low.

[0041] The function of the clamping member 115 is to ensure that the scraper 2 can be firmly fixed on the mounting member 114 to prevent the scraper 2 from loosening or shifting during operation. The clamping member 115 is designed to be threaded with the mounting member 114, and the scraper 2 is firmly fixed in the mounting groove 116 by locking or clamping, thereby ensuring that the scraper 2 will not be offset due to vibration or external force during the entire powder spreading process. This design also ensures that the scraper 2 will not loosen during high-frequency reciprocating motion, thereby improving working stability.

[0042] Please refer to Figure 3 As shown, the mounting member 114 and the pressing member 115 are provided with a mounting groove 116, which is designed to facilitate the installation and removal of the scraper 2. The scraper 2 is clamped in the mounting groove 116, so that the scraper 2 can be easily assembled into the blade holder 11, and can also be stably fixed. During the use of the scraper 2, the mounting groove 116 can effectively prevent the scraper 2 from loosening or misalignment, ensuring that the scraper 2 always maintains appropriate contact with the powder layer during operation. This clamping design improves the convenience of installation and the efficiency of disassembly of the scraper 2, and reduces the cumbersome steps that may occur during maintenance and replacement.

[0043] For details, please refer to Figure 1 and Figure 2As shown, the seat body 113 is threaded with a first adjusting bolt 121 and a second adjusting bolt 122, and one end of the first adjusting bolt 121 and the second adjusting bolt 122 passes through the seat body 113 and respectively abuts against the top surfaces of the two ends of the mounting member 114. The first adjusting bolt 121 and the second adjusting bolt 122 mainly adjust the inclination angle of the mounting member 114 to change the working angle and scraping depth of the scraper 2 to adapt to different usage requirements and powder characteristics.

[0044] The seat body 113 serves as the basic support structure of the scraper 2, and is provided with two adjustment bolts, which are installed by threaded connection. The ends of these adjustment bolts pass through the seat body 113 and are tightly abutted against the top surfaces of the two ends of the mounting member 114. During adjustment, one end of the adjustment bolt abuts against the top surface of the mounting member 114, and the inclination angle of the mounting member 114 is controlled by rotating the adjustment bolt. The precise adjustment function of the adjustment bolt can ensure that the scraper 2 contacts the surface of the powder layer at a better angle, thereby effectively controlling the thickness and uniformity of the powder, and avoiding uneven or irregular powder spreading caused by improper angles of the scraper 2.

[0045] The design of the adjusting bolt adopts a threaded connection, which not only ensures the reliability of the installation, but also facilitates fine-tuning during use. By rotating the first adjusting bolt 121 and the second adjusting bolt 122, the height or inclination angle of the two ends of the mounting member 114 can be adjusted respectively, thereby affecting the contact angle between the scraper 2 and the powder layer. When the inclination of the scraper 2 needs to be adjusted, by adjusting the two bolts simultaneously or separately, accurate angle control of the scraper 2 can be achieved, ensuring that the scraper 2 maintains a better contact angle with the surface of the powder layer, thereby improving the powder spreading quality.

[0046] This adjustment mechanism not only enables flexible adjustment of the scraper 2 angle, but also makes the scraper 2 assembly highly adaptable under different operating conditions. Through simple bolt adjustment, it can quickly respond to different types of powders or molding requirements and achieve high-quality powder spreading operations. In addition, the structural design of the adjustment bolt allows the adjustment process to be completed without disassembling other components, which improves the convenience of operation.

[0047] In an exemplary embodiment, please refer to Figure 2 and Figure 5 As shown, a first vibrator 13 is disposed on the base 113, and the first vibrator 13 is penetrated in the base 113. The first vibrator 13 optimizes the laying quality of the powder through vibration, thereby enhancing the density and uniformity of the powder layer.

[0048] The first vibrator 13 is installed inside the base 113, and the vibration frequency is controlled to make the scraper 2 generate high-frequency micro-disturbance during operation. Specifically, the setting position of the first vibrator 13 and the way it is inserted into the base 113 ensure that the vibration can be effectively transmitted to the scraper 2, thereby generating tiny high-frequency vibrations. These vibrations can not only form uniform micro-disturbances on the surface of the scraper 2, but also promote the rearrangement and compaction of the powder at the microscopic level during the laying process, so that the powder is more densely stacked, the existence of air gaps is reduced, and the density of the powder layer is improved.

[0049] The density of the powder directly affects the quality of the molding layer, especially during the printing process, the compaction degree of the powder layer will affect the melting effect after laser scanning. Through the micro-disturbance of the first vibrator 13, the uneven accumulation of powder can be effectively avoided, while reducing the looseness of the powder and improving the quality of powder spreading. Especially in the powder bed printing process using continuous cycle powder feeding, the unevenness of powder accumulation often leads to unstable powder spreading quality, which in turn affects the printing effect. Through the effect of vibration, it can be ensured that each layer of powder has good uniformity and density, thereby effectively improving the printing manufacturing quality.

[0050] The design of the first vibrator 13 being installed inside the base 113 not only ensures the stability of vibration transmission, but also maximizes its effect without increasing the size of the outer shape. By integrating the vibrator into the base 113, the structural interference that may be caused by external installation is avoided, and the volume of the overall component is also reduced. In addition, this built-in design can also effectively reduce air resistance and avoid disturbance of airflow, thereby not affecting the stability of other key parameters during the printing process.

[0051] For details, please refer to Figure 2 and Figure 5 As shown, the seat body 113 is provided with a mounting hole 117 extending from the tail to the head thereof, and the first vibrator 13 is arranged in a long strip through the mounting hole 117. The first vibrator 13 is embedded in the seat body 113, thereby avoiding interference of the first vibrator 13 with the outer contour of the scraper 2 assembly. In this way, the first vibrator 13 can play its due function without protruding the basic contour of the scraper 2, and neither increase the resistance of the scraper 2 assembly to the airflow nor generate unnecessary disturbance to the wind field.

[0052] The mounting hole 117 on the base 113 is designed to facilitate the placement and fixation of the first vibrator 13, ensuring that the first vibrator 13 works stably during use. The mounting hole 117 extends from the rear of the base 113 to the head (not through the head), and the first vibrator 13 is in a long strip shape. Its design is not only convenient for installation, but also can be effectively hidden in the base 113, avoiding additional changes in the external structure.

[0053] The long strip-shaped first vibrator 13 is structurally convenient for installation in the base 113, and its outline can be hidden, ensuring that the outer lines of the scraper 2 assembly are not affected. More importantly, this design avoids the increase or protrusion of the scraper 2 assembly that may be caused by traditional vibrators, thereby eliminating the additional interference to the wind field of the molding cavity due to size changes. If the first vibrator 13 is designed to be too large or protruding in appearance, it may change the airflow path of the scraper 2 assembly, causing airflow disturbances, affecting the laying quality of the powder and the subsequent laser melting process. By adopting the long strip-shaped first vibrator 13, it can be matched with the base 113, ensuring that the function of the first vibrator 13 is realized without increasing the resistance to air flow or causing instability in the wind field.

[0054] In an exemplary embodiment, please refer to Figure 1 , Figure 2 and Figure 4 As shown, the tool holder 1 further includes an inclined beam 14 disposed on the top of the tool holder 11, the inclined beam 14 is inclined from the head to the tail of the tool holder 11, and wind-breaking inclined surfaces 141 are disposed on both sides of the inclined beam 14, the inclination of the wind-breaking inclined surfaces 141 is 15-60 degrees, and the inclination of the wind-breaking inclined surfaces 141 is less than the inclination of the side inclined surfaces 111. The design purpose of the inclined beam 14 is to solve the problem of airflow disturbance that may be caused by the tool holder 1 during the powder spreading process, while maintaining the structural stability and rigidity of the tool holder 1.

[0055] The basic structure of the inclined beam 14 is an inclined beam 14 arranged on the top of the tool holder 11, which is inclined from the head to the tail of the tool holder 11. The setting of this inclination angle is intended to optimize the overall structure of the tool holder 1, so that it can be evenly distributed when subjected to force, and enhance the overall rigidity of the tool holder 1.

[0056] The wind-breaking slopes 141 on both sides of the inclined beam 14 further strengthen the guiding effect of the tool holder 1 on the wind field in the molding cavity. The inclination range of the wind-breaking slope 141 is 15 to 60 degrees, and is smaller than the inclination of the side slope 111 of the tool holder 11. The inclination of the wind-breaking slope 141 is selected to achieve two purposes: on the one hand, the smaller inclination ensures that the wind-breaking slope 141 can effectively divert the wind field and avoid excessive airflow disturbances. On the other hand, it can also reduce wind resistance to a certain extent, thereby optimizing the overall aerodynamic performance of the scraper 2 assembly. Through a reasonable slope angle, the wind-breaking slope 141 can reduce the turbulence of the airflow, making the powder more uniform during the laying process and improving the powder laying effect.

[0057] In addition, the role of the wind-breaking slope 141 is not limited to guiding the wind field, it can also play a dual role of reducing airflow resistance and alleviating wind field disturbances. During the powder spreading process, the movement of the tool holder 1 is often accompanied by changes in the airflow. Especially when moving at high speed, the airflow is easily affected by the tool holder 1 and becomes turbulent. The purpose of the wind-breaking slope 141 is to guide the airflow so that the wind field remains in a more stable state, avoiding uneven accumulation of powder due to unstable airflow, thereby affecting the printing quality. The wind-breaking slope 141 cooperates with the side slope 111 of the tool holder 11 to form an effective wind flow guiding system, ensuring that the tool holder 1 minimizes interference with the wind field during operation.

[0058] For details, please refer to Figure 4 As shown, the angle α between the two side surfaces of the inclined beam 14 is 6 to 10°, and the width of the inclined beam 14 gradually decreases from front to back. The angle between the two side surfaces of the inclined beam 14 is set to 6 to 10°, which can provide sufficient wind guiding effect without weakening the structural rigidity of the inclined beam 14 due to excessively large angles. The design of the angle between the two side surfaces allows the airflow to be smoothly guided when passing through the inclined beam 14, thereby reducing the generation of turbulence and ensuring the stability of the wind field during the powder laying process. An angle that is too large may cause the airflow to lose control and produce irregular wind field disturbances, while an angle that is too small may reduce the wind guiding effect, so an angle of 6 to 10° becomes the optimal range for achieving balance.

[0059] The width of the inclined beam 14 gradually decreases from front to back, and this design reduces the resistance of the inclined beam 14 in the air flow. The larger width at the front can provide sufficient support and initial wind guide surface, while the gradually decreasing width at the rear effectively reduces the formation of tail vortex, making the airflow on the inclined beam 14 more stable.

[0060] Please refer to Figure 1 and Figure 6 As shown, the present application also provides a powder spreading device, which includes a forming cylinder 3 and the aforementioned scraper 2 assembly, and the scraper 2 assembly is used to spread the powder in the forming cylinder 3. The cylinder body of the forming cylinder 3 is provided with a second vibrator 31 for vibrating the cylinder body.

[0061] The forming cylinder 3 is used to contain the powder in the additive manufacturing process and provide an operating space for the scraper 2 assembly. A second vibrator 31 is provided on the cylinder body of the forming cylinder 3. The second vibrator 31 cooperates with the scraper 2 assembly to optimize the laying process of the powder through vibration and improve the density and uniformity of the powder.

[0062] During the powder laying process, the powder often forms a loose accumulation state due to the driving force of the scraper 2, and such an accumulation state may affect the accuracy of subsequent printing. By vibrating the cylinder body, the second vibrator 31 can cause the powder to vibrate slightly during the laying process, thereby promoting uniform flow and better arrangement between the powder particles. This micro-disturbance can not only enable the powder particles to better fill the space in the cylinder and avoid the generation of gaps, but also improve the density of the powder, ensure that the thickness and density of each layer of powder meet the requirements, and provide a stable foundation for the laser melting process.

[0063] The present application also provides an additive printing device, which includes the aforementioned powder spreading device. The additive printing device forms a complete additive printing system by combining the powder spreading device with other components of the printing system, such as a laser scanner, a temperature control system, etc.

[0064] To summarize, the scraper assembly, powder spreading device and additive printing equipment provided in the present application, through the inclined side slope and top slope design on the tool holder, can reduce the disturbance of the wind field caused by the reciprocating motion of the tool holder in the molding cavity, ensure the uniformity of powder distribution during the powder spreading process, and effectively avoid problems such as poor laser melting and excessive surface roughness caused by uneven powder layer; the vibrator equipped in the scraper assembly enhances the density of the powder through micro-disturbance, avoiding printing defects caused by too loose powder layer.

[0065] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0066] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A scraper assembly for spreading powder, characterized in that: The scraper assembly comprises: The tool holder comprises a tool holder for mounting a scraper, wherein the sides and the top of the tool holder head are provided with side bevels and a top bevel inclined toward the tail of the tool holder, the angle between the side bevels and the side surface of the tool holder is 15 to 60 degrees, and the angle between the top bevel and the powder spreading plane is 15 to 60 degrees; The scraper is installed on the blade seat.

2. The scraper assembly according to claim 1, characterized in that: The knife seat comprises a seat body, a mounting member and a pressing member. The mounting member is adjustably mounted on the seat body, and the pressing member is fixedly mounted on the mounting member.

3. The scraper assembly according to claim 2, characterized in that: The mounting member and the pressing member are provided with mounting grooves, and the scraper is clamped in the mounting grooves.

4. The scraper assembly according to claim 2, characterized in that: The seat body is threaded with a first adjusting bolt and a second adjusting bolt. One end of the first adjusting bolt and the second adjusting bolt passes through the seat body and abuts against the top surfaces of both end portions of the mounting member respectively.

5. The scraper assembly according to claim 2, characterized in that: The base body is provided with a first vibrator, which is arranged in the base body; the base body is provided with a mounting hole extending from the tail portion toward the head portion, and the first vibrator is arranged in a long strip shape through the mounting hole.

6. The scraper assembly according to claim 1, characterized in that: The tool holder also includes an inclined beam arranged on the top of the tool seat, the inclined beam is inclined from the head of the tool seat toward the tail, and wind-breaking slopes are provided on both sides of the inclined beam. The inclination of the wind-breaking slope is 15 to 60 degrees, and the inclination of the wind-breaking slope is smaller than the inclination of the side slope.

7. The scraper assembly according to claim 6, characterized in that: The angle between the two side surfaces of the oblique beam is 6-10 degrees, and the width of the oblique beam gradually decreases from front to back.

8. A powder spreading device, characterized in that: The invention comprises a forming cylinder and a scraper assembly according to any one of claims 1 to 7, wherein the scraper assembly is used for leveling the powder in the forming cylinder.

9. The powder spreading device according to claim 8, characterized in that: A second vibrator for vibrating the cylinder body is provided on the cylinder body of the forming cylinder.

10. An additive printing device, characterized in that: It comprises the powder spreading device as described in claim 8 or 9.

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