Scraper mechanism, powder spreading device, powder supply and spreading device and additive manufacturing equipment

Abstract

The present application relates to a scraper mechanism, a powder spreading device, a powder supplying and spreading device and an additive manufacturing device. The scraper mechanism includes a powder passing chamber, which is used to receive the falling additive powder. The additive powder falls through the powder discharge port to the area between the first scraper and the second scraper, so that the scraper assembly spreads the additive powder to the workbench, so that the additive powder only contacts the inner side of the first scraper and the second scraper, and does not stick to the outer side of the first scraper and the second scraper, thereby greatly reducing the falling path of the additive powder. When performing two-way powder spreading, the falling additive powder will weaken its own free fall acceleration due to the blocking effect of the first buffer groove and the second buffer groove. In addition, a part of the additive powder will enter the first buffer groove and the second buffer groove, reducing the fluidity of the additive powder. In this way, the additive powder can be effectively prevented from overflowing, thereby avoiding the occurrence of failure of the powdered surface caused by the overflow of the additive powder, and improving the quality of the sintered parts.

Description

Technical Field

[0001] The present application relates to the technical field of additive manufacturing, and in particular to a scraper mechanism, a powder spreading device, a powder supply and spreading device, and additive manufacturing equipment. Background Art

[0002] The basic process of traditional selective laser sintering technology is: the powder feeding device feeds a certain amount of additive powder to the workbench of the forming cylinder, the conventional powder spreading device spreads the additive powder on the workbench surface onto the upper surface of the part to be formed in the forming cylinder, the heating device heats the additive powder to a set temperature, and the laser galvanometer system controls the laser to scan the additive powder within the contour according to the cross-sectional contour of the layer, so that the additive powder melts and bonds with the formed part below; when a layer of cross section is sintered, the workbench drops by one layer of thickness, the powder feeding device and the powder spreading device repeat the powder feeding and spreading actions, and spreads a layer of uniform and dense additive powder on the sintered cross section of the part to be formed, and performs scanning and sintering of a new layer of cross section, and after several layers of scanning and superposition, the entire prototype manufacturing is completed.

[0003] In order to save the waiting time for powder spreading, a two-way powder spreading mechanism is generally used for powder spreading. A simple double-edged scraper structure is used in the two-way powder spreading mechanism. The additive powder is contained in the cavity between the two blades. The movement of the scraper from one side of the cavity to the other side is a powder spreading. There is no need for the powder spreading device to go back and forth to the powder receiving position for each powder spreading. This method does not require the use of electrical power and is simple and practical.

[0004] However, during use of the current two-way powder spreading mechanism, there is a situation where the scraper drops excess additive powder on the spread powder surface, causing the powder surface to be uneven, thus leading to printing failure. Summary of the invention

[0005] Based on this, it is necessary to provide a scraper mechanism with a simple structure to solve the problem that the scraper drops excess additive powder on the paved powder surface, causing the powder surface to be uneven.

[0006] According to one aspect of the present application, a scraper mechanism is provided, comprising:

[0007] Scraper mounting bracket;

[0008] A scraper assembly, comprising a first scraper and a second scraper;

[0009] A scraper fixing member having a first side, wherein the scraper assembly is coupled to the scraper mounting seat by means of the scraper fixing member;

[0010] A powder passing chamber, wherein the powder passing chamber is configured to penetrate the scraper mounting seat and the scraper fixing member and be located between the first scraper and the second scraper, and a powder discharge port is formed on the first side of the scraper fixing member;

[0011] Wherein, a buffer groove is further provided on the first side of the scraper fixing member, and the buffer groove includes a first buffer groove having a first overflow port and a second buffer groove having a second overflow port;

[0012] The first buffer groove is located between the first scraper and the powder discharge port and faces the workbench with the first overflow port, and the second buffer groove is located between the second scraper and the powder discharge port and faces the workbench with the second overflow port.

[0013] In one embodiment, the first scraper has a first blade surface, and the second scraper has a second blade surface, and the first blade surface and the second blade surface are used to flatten the powder surface;

[0014] The first blade surface and the second blade surface are configured to be coplanar and form a first height difference with the first side of the scraper fixing member;

[0015] Wherein, the first height difference is 1.5 mm ~ 4 mm.

[0016] In one embodiment, the first height difference is 2 mm to 3 mm.

[0017] In one embodiment, the powder passing chamber is constructed to have a first powder passing wall and a second powder passing wall which are parallel to and opposite to each other, and the distance between the first powder passing wall and the second powder passing wall is a first spacing;

[0018] The first spacing is 8 mm to 15 mm.

[0019] In one embodiment, the powder passing chamber further comprises a first buffer wall and a second buffer wall arranged opposite to each other;

[0020] The first buffer wall is connected to the first powder passing wall and is located downstream of the first powder passing wall in the powder falling direction;

[0021] The second buffer wall is connected to the second powder passing wall and is located downstream of the second powder passing wall in the powder falling direction.

[0022] In one embodiment, in the powder falling direction, the first buffer wall is inclined relative to the first powder passing wall toward the central axis of the powder passing chamber, and the angle between the first buffer wall and the horizontal plane is a first repose angle;

[0023] The second buffer wall is inclined relative to the second powder passing wall toward the central axis of the powder passing chamber, and the angle between the second buffer wall and the horizontal plane is a second repose angle;

[0024] The first repose angle is the minimum angle formed by the first buffer wall and the horizontal plane when the first buffer wall causes the additive powder placed thereon to be in a critical state of sliding down along the first buffer wall;

[0025] The second repose angle is the minimum angle formed by the second buffer wall and the horizontal plane when the second buffer wall causes the additive powder placed thereon to be in a critical state of sliding down along the second buffer wall.

[0026] In one embodiment, the first buffer wall cooperates with the second buffer wall to form the powder discharge port with a second spacing;

[0027] The second spacing is 3 mm to 6 mm.

[0028] As a general inventive concept, the present application also provides a powder spreading device, which is used to move along a powder spreading route and spread additive powder on a workbench of an additive manufacturing device, wherein the powder spreading device includes a powder dispensing mechanism and the above-mentioned scraper mechanism;

[0029] The powder dispensing mechanism comprises a powder dispensing seat and a powder dispensing component fixed in the powder dispensing seat;

[0030] The powder dispensing seat is provided with a powder input area and a powder output area;

[0031] The powder outlet area is communicated with the powder passing chamber.

[0032] As a general inventive concept, the present application also provides a powder supply and spreading device, including a powder supply device and the above-mentioned powder spreading device;

[0033] The powder supply device is arranged above the powder spreading device, and the powder supply device is used to transport the additive powder to the powder input area.

[0034] As a general inventive concept, the present application also provides an additive manufacturing device, including a workbench and the above-mentioned powder supply and powder spreading device;

[0035] The powder spreading device is located above the workbench and can move along the powder spreading route of the workbench. The powder spreading device is used to spread the additive powder distributed by the powder mixing component to the powder outlet area onto the workbench.

[0036] The above-mentioned scraper mechanism, powder spreading device, powder supply and spreading device and additive manufacturing equipment, the powder chamber is used to receive the falling additive powder, and the additive powder falls to the area between the first scraper and the second scraper through the powder discharge port, so that the scraper assembly spreads the additive powder onto the workbench, so that the additive powder only contacts the inner side of the first scraper and the second scraper, and does not stick to the outer side of the first scraper and the second scraper, thereby greatly reducing the falling path of the additive powder. When performing two-way powder spreading, the falling additive powder will weaken its own falling acceleration due to the blocking effect of the first buffer groove and the second buffer groove. In addition, a part of the additive powder will enter the first buffer groove and the second buffer groove, which can reduce the fluidity of the additive powder. In this way, the additive powder can be effectively prevented from overflowing, thereby avoiding the occurrence of failure of the powdered surface caused by the overflow of the additive powder, and improving the quality of the sintered parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a scraper mechanism in one embodiment of the present application;

[0038] Figure 2 It is a structural schematic diagram of a scraper mechanism in another embodiment of the present application;

[0039] Figure 3 for Figure 1 A schematic structural diagram of the scraper mechanism from another perspective shown;

[0040] Figure 4 for Figure 1 A schematic structural diagram of a scraper assembly of the scraper mechanism shown;

[0041] Figure 5 for Figure 1 A schematic structural diagram of a scraper assembly of the scraper mechanism shown in FIG. 1 from another perspective;

[0042] Figure 6 This is a schematic diagram of the powder spreading operation of the powder supply and spreading device in one embodiment of the present application;

[0043] Figure 7 for Figure 6 Another schematic diagram of the powder spreading operation of the powder supply and spreading device is shown. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0050] When the double-blade powder spreading mechanism is spreading powder, the additive powder falls from the powder outlet and forms an accumulation. The additive powder accumulation will produce a downward extrusion force due to its own gravity. In addition, due to the top-down powder feeding method, the additive powder has gravity acceleration when it falls from above into the middle area of ​​the double-blade scraper, which may cause the additive powder to overflow from the gap between the scraper and the powder surface.

[0051] Based on this, the present application provides a scraper mechanism that can better improve the above-mentioned problems.

[0052] The scraper mechanism of the present application will be described below with reference to the accompanying drawings.

[0053] Figure 1 It is a structural schematic diagram of a scraper mechanism in one embodiment of the present application; Figure 2 It is a structural schematic diagram of a scraper mechanism in another embodiment of the present application; Figure 3 for Figure 1 A schematic structural diagram of the scraper mechanism from another perspective shown; Figure 4 for Figure 1 A schematic structural diagram of a scraper assembly of the scraper mechanism shown; Figure 5 for Figure 1 A schematic structural diagram of a scraper assembly of the scraper mechanism shown in FIG. 1 from another perspective; Figure 6 This is a schematic diagram of the powder spreading operation of the powder supply and spreading device in one embodiment of the present application; Figure 7 for Figure 6 Another schematic diagram of the powder spreading operation of the powder supply and spreading device is shown. For ease of description, only the structures related to the present application are shown in the drawings.

[0054] The scraper mechanism 100 disclosed in at least one embodiment of the present application is used to spread the additive powder onto the workbench 300 along the powder spreading direction, and includes a scraper mounting seat 110, a scraper assembly 120, a scraper fixing member 130, a powder passing chamber 140, and a buffer tank 150. The scraper assembly 120 is located at the bottom of the scraper mounting seat 110, and the scraper fixing member 130 is used to fix the scraper assembly 120 at the bottom of the scraper mounting seat 110. The scraper assembly 120 includes a first scraper 121 and a second scraper 122, and a powder storage area is formed in the middle area between the first scraper 121 and the second scraper 122, and the first scraper 121 and the second scraper 122 are used to spread the additive powder in the powder storage area onto the workbench 300. The scraper fixing member 130 has a first side 131, and the powder passing chamber 140 is arranged between the scraper mounting seat 110 and the scraper fixing member 130 and is located between the first scraper 121 and the second scraper 122. A powder discharge port 141 for discharging additive powder is also formed on the first side 131 of the scraper fixing member 130. The first side 131 of the scraper fixing member 130 is the side of the scraper fixing member 130 away from the scraper mounting seat 110. A buffer groove 150 is also arranged on the first side 131 of the scraper fixing member 130, and the buffer groove 150 includes a first buffer groove 151 with a first overflow port and a second buffer groove 152 with a second overflow port. The first buffer groove 151 is located between the first scraper 121 and the powder discharge port 141 and faces the workbench 300 with the first overflow port, and the second buffer groove 152 is located between the second scraper 122 and the powder discharge port 141 and faces the workbench 300 with the second overflow port. Specifically, in actual use, the additive powder discharged from the powder discharge port 141 has a certain acceleration. After the additive powder enters the first buffer groove 151 and the second buffer groove 152 through the first overflow port and the second overflow port, friction is formed due to the contact between the first buffer groove 151 and the second buffer groove 152 and the additive powder, thereby weakening the free fall acceleration of the additive powder and reducing the flow speed of the additive powder. In this way, the setting of the buffer groove 150 can effectively prevent the additive powder from overflowing from between the scraper assembly 120 and the powder surface.

[0055] In some specific embodiments, the scraper fixing member 130 may be a pressure plate, and the first scraper 121 and the second scraper 122 are fixedly mounted on the scraper mounting seat 110 through the pressure plate. In some specific embodiments, the cross-sectional shape of the buffer groove 150 may be a semicircular, trapezoidal or other shapes. Preferably, the cross-sectional shape of the buffer groove 150 is selected to be a semicircular or trapezoidal. In this way, the processing and forming of the first buffer groove 151 and the second buffer groove 152 can be facilitated. It can be understood that the above examples are only for illustration and cannot be understood as a limitation of the present application.

[0056] In some embodiments, the first scraper 121 has a first blade surface 1211, and the second scraper 122 has a second blade surface 1221, and the first blade surface 1211 and the second blade surface 1221 are arranged coplanarly. It can be understood that the better the coplanarity of the first blade surface 1211 and the second blade surface 1221, the more consistent the thickness of the powder layer in two directions when performing bidirectional powder spreading. Specifically in some embodiments, the flatness of the first blade surface 1211 and the second blade surface 1221 is set to 0.03 mm~0.05 mm. In this way, the consistency of the layer thickness of the bidirectional powder spreading operation can be improved.

[0057] In some embodiments, the first blade surface 1211 and the second blade surface 1221 are protruded from the first side 131 of the scraper fixing member 130, so as to form a first height difference with the first side 131 of the scraper fixing member 130. In some embodiments, the first height difference is set to be between 1.5 mm and 4 mm. It should be understood that when the first height difference is too small, the powder storage area between the first scraper 121 and the second scraper 122 is too small, which is not conducive to the leveling of the powder surface of the first blade surface 1211 and the second blade surface 1221; when the first height difference is too large, the powder storage area formed between the first scraper 121 and the second scraper 122 will be enlarged, thereby increasing the accumulation volume of the additive powder and the accumulation weight of the additive powder, which will cause the accumulated additive powder to squeeze the previously laid powder bed during the printing process, thereby destroying the already laid powder bed, and the additive powder has a tendency to flow to the outside of the first scraper 121 and the second scraper 122 due to its own weight, thereby causing the additive powder to overflow. In order to avoid the destruction of the powder bed and the overflow of the additive powder, the range of the first height difference is limited to between 1.5 mm and 4 mm. As a preferred embodiment, the first height difference is between 2 mm and 3 mm, so that the size of the powder storage area is more reasonable. Preferably, the first height difference is 2 mm / 2.5 mm / 3 mm.

[0058] In some embodiments, the edge shape of the first scraper 121 and the second scraper 122 can be rounded, chamfered or not chamfered. As a preferred embodiment, the edge shape of the first scraper 121 and the second scraper 122 is a chamfered right angle, which improves the wear resistance of the first scraper 121 and the second scraper 122.

[0059] In some embodiments, the material of the first scraper 121 and the second scraper 122 can be rubber or metal. Specifically in some embodiments, the scraper assembly 120 also includes a scraper connecting portion, and the first scraper 121 and the second scraper 122 are connected to the scraper connecting portion. Among them, the first scraper 121, the second scraper 122 and the scraper connecting portion are all made of rubber material; or the first scraper 121 and the second scraper 122 are made of rubber material, and the scraper connecting portion is made of metal material; or the first scraper 121, the second scraper 122 and the scraper connecting portion are all made of metal material.

[0060] In some embodiments, the powder passing chamber 140 is constructed to have a first powder passing wall 142 and a second powder passing wall 143 which are parallel to each other and arranged opposite to each other, and the distance between the first powder passing wall 142 and the second powder passing wall 143 is set to a first spacing. Specifically in some embodiments, the size of the first spacing is 8 mm to 15 mm. It can be understood that if the first spacing is too small, the additive powder is not easy to fall from the powder passing chamber 140, resulting in the additive powder being retained and blocked in the powder passing chamber 140; if the first spacing is too large, the descending speed of the additive powder is too fast, the discharge speed of the additive powder will be accelerated, and the discharge amount of the additive powder will increase, so that during the powder spreading operation, the powder bed that has been spread is easily damaged and the additive powder overflows. In order to avoid the blockage of the powder passing chamber 140, the damage of the powder bed that has been spread, and the overflow of the additive powder, the size of the first spacing can be set to between 8 mm and 15 mm. As a preferred embodiment, the first spacing is between 8 mm and 12 mm, which can more effectively avoid the blockage of the powder chamber 140, the damage of the powder bed, and the overflow of the additive powder. Preferably, the first spacing is selected to be 8 mm / 10 mm / 12 mm.

[0061] In some embodiments, the powder passing chamber 140 further has a first buffer wall 144 and a second buffer wall 145 disposed opposite to each other. The first buffer wall 144 is connected to the first powder passing wall 142 and is located downstream of the first powder passing wall 142 in the powder falling direction; the second buffer wall 145 is connected to the second powder passing wall 143 and is located downstream of the second powder passing wall 143 in the powder falling direction. Specifically in practical application, when the additive powder falls from the powder passing chamber 140, part of the additive powder will first fall on the first buffer wall 144 and the second buffer wall 145, and then slide from the first buffer wall 144 and the second buffer wall 145 to the powder discharge port 141 and be discharged from the powder discharge port 141. In this way, the first buffer wall 144 and the second buffer wall 145 can effectively reduce the falling acceleration of the additive powder and reduce the impact of the additive powder, thereby avoiding the destruction of the already laid powder bed and the occurrence of additive powder overflow.

[0062] In some embodiments, in the powder falling direction, the first buffer wall 144 is tilted relative to the first powder passing wall 142 toward the central axis of the powder passing chamber 140, and the angle between the first buffer wall 144 and the horizontal plane is the first repose angle, and the second buffer wall 145 is tilted relative to the second powder passing wall 143 toward the central axis of the powder passing chamber 140, and the angle between the second buffer wall 145 and the horizontal plane is the second repose angle. (The repose angle of powder is the maximum angle formed by the free surface of the powder when it is naturally accumulated and the horizontal plane in a static equilibrium state. The repose angle can be used to measure and evaluate the fluidity of the powder, and the repose angle of each powder is determined according to the characteristics of the powder).

[0063] The first repose angle is the minimum angle formed between the first buffer wall 144 and the horizontal plane when the additive powder placed thereon is in a critical state of sliding down along the first buffer wall 144; the second repose angle is the minimum angle formed between the second buffer wall 145 and the horizontal plane when the additive powder placed thereon is in a critical state of sliding down along the second buffer wall 145. It can be understood that the magnitudes of the first repose angle and the second repose angle are related to the characteristics of the additive powder. Specifically, if the angle formed between the first buffer wall 144 and the horizontal plane is greater than the first repose angle, and the angle formed between the second buffer wall 145 and the horizontal plane is greater than the second repose angle, the additive powder can flow on the first buffer wall 144 and the second buffer wall 145, and as the first repose angle and the second repose angle increase, the limiting ability of the first buffer wall 144 and the second buffer wall 145 on the fluidity of the additive powder gradually decreases, the flow ability of the additive powder on the first buffer wall 144 and the second buffer wall 145 gradually increases, and the amount of additive powder discharged increases, thereby causing the destruction of the already laid powder bed and the occurrence of additive powder overflow; if the angle formed between the first buffer wall 144 and the horizontal plane is less than the first repose angle, and the angle formed between the second buffer wall 145 and the horizontal plane is less than the second repose angle, then the additive powder will stop flowing after falling on the first buffer wall 144 and the second buffer wall 145, and the additive powder will not be able to reach the workbench 300, resulting in ineffective powder laying. By setting the angle between the first buffer wall 144 and the horizontal plane to be equal to the first repose angle, and the angle between the second buffer wall 145 and the horizontal plane to be equal to the second repose angle, the additive powder falling onto the first buffer wall 144 and the second buffer wall 145 can be in a critical state of sliding. In this way, it can avoid the damage of the powder bed and the overflow of the additive powder due to excessive leakage of the additive powder, and also avoid the ineffective powder spreading action due to insufficient leakage of the additive powder.

[0064] In some embodiments, the angle formed between the first buffer wall 144 and the horizontal plane is set to be slightly larger than the first repose angle, and the angle formed between the second buffer wall 145 and the horizontal plane is set to be slightly larger than the second repose angle. Specifically in some embodiments, the angle formed between the first buffer wall 144 and the horizontal plane is greater than the first repose angle by no more than 10°, and the angle formed between the second buffer wall 145 and the horizontal plane is greater than the second repose angle by no more than 10°. More specifically in some embodiments, if the first repose angle of the additive powder on the first buffer wall 144 is 30°, and the second repose angle of the additive powder on the second buffer wall 145 is 30°, then the angle formed between the first buffer wall 144 and the horizontal plane is set to 35°-40°, and the angle formed between the second buffer wall 145 and the horizontal plane is set to 35°-40°. In this way, the fluidity of the additive powder on the first buffer wall 144 and the second buffer wall 145 can be within a reasonable and controllable range.

[0065] In some embodiments, the first buffer wall 144 and the second buffer wall 145 cooperate to form a powder discharge port 141, and the powder discharge port 141 has a second spacing. Specifically, in some embodiments, the second spacing may be 3 mm to 6 mm. It is understandable that if the second spacing is too small, the additive powder is not easy to fall from the powder chamber 140, resulting in the additive powder being retained and blocked in the powder chamber 140; if the second spacing is too large, the descending speed of the additive powder is too fast, the discharge speed of the additive powder will be accelerated, and the discharge amount of the additive powder will increase, which is easy to cause the damage of the powder bed and the overflow of the additive powder during the powder spreading operation. In order to avoid the blockage of the powder chamber 140, the damage of the powder bed and the overflow of the additive powder, the size of the second spacing can be limited to between 3 mm and 6 mm. As a preferred embodiment, the second spacing is between 4 mm and 5 mm, which is effective to avoid the blockage of the powder chamber 140, the damage of the powder bed and the overflow of the additive powder. Preferably, the second spacing is 4 mm / 4.5 mm / 5 mm.

[0066] The present application also provides a powder spreading device, which is used to move along the powder spreading route and spread the additive powder on the workbench 300 of the additive manufacturing equipment, including a powder dispensing mechanism 200 and a scraper mechanism 100 as described above. Specifically in some embodiments, the powder dispensing mechanism 200 includes a powder dispensing seat and a powder dispensing assembly arranged in the powder dispensing seat, and the powder dispensing seat is provided with a powder inlet area and a powder outlet area, and the powder outlet area is connected to the powder passing chamber 140. More specifically in some embodiments, the powder dispensing assembly includes a powder dispensing roller, and a dynamic accommodating chamber is provided on the powder dispensing roller. During the rotation of the powder dispensing roller, when the dynamic accommodating chamber is connected to the powder inlet area, the dynamic accommodating chamber realizes the powder receiving action, and when the powder dispensing roller rotates again until the dynamic accommodating chamber is connected to the powder outlet area, the dynamic accommodating chamber realizes the powder feeding action. Specifically in actual use, the additive powder enters from the powder inlet area on the powder dispensing seat, enters the powder outlet area after passing through the powder dispensing assembly, and then enters the powder passing chamber 140 from the powder outlet area, and falls onto the workbench 300.

[0067] As a general inventive concept, the present application also provides a powder supply and powder spreading device, including a powder supply device and a powder spreading device as described above, wherein the powder supply device is arranged above the powder spreading device and is used to transport the additive powder to the powder entry area. Specifically, in actual use, the powder supply device is fixed at a powder supply station above the powder spreading route, and the powder spreading device moves along the powder spreading route to just below the powder supply station, and the powder supply device transports the additive powder to the powder entry area.

[0068] As a general inventive concept, the present application also provides an additive manufacturing device, including a workbench 300 and a powder supply and spreading device as described above, wherein the powder spreading device is located above the workbench 300 and can move along the powder spreading route of the workbench 300, and the powder spreading device is used to spread the additive powder distributed by the powder mixing component to the powder outlet area onto the workbench 300.

[0069] The scraper mechanism 100 can effectively prevent the destruction of the powder bed and the overflow of the additive powder by setting the buffer groove 150, limiting the first height difference between the first blade surface 1211 and the second blade surface 1221 and the first side 131 of the scraper fixing member 130, setting the first buffer wall 144 and the second buffer wall 145, limiting the angle formed between the first buffer wall 144 and the horizontal plane and the angle formed between the second buffer wall 145 and the horizontal plane, limiting the first spacing of the powder chamber 140 and the second spacing of the powder discharge port 141, etc., thereby improving the flatness of the powder surface. The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A scraper mechanism, used to spread additive powder onto a workbench along a powder spreading direction, characterized in that: The scraper mechanism comprises: Scraper mounting bracket; A scraper fixing member having a first side, and the scraper assembly is coupled to the scraper mounting seat by means of the scraper fixing member; A scraper assembly, comprising a first scraper and a second scraper; the first scraper has a first blade surface, the second scraper has a second blade surface, the first blade surface and the second blade surface are used to flatten powdered dough; the first blade surface and the second blade surface are coplanar and form a first height difference with the first side of the scraper fixing member; wherein the first height difference is 1.5 mm to 4 mm; A powder passing chamber, the powder passing chamber is constructed to penetrate the scraper mounting seat and the scraper fixing member and is located between the first scraper and the second scraper, and a powder discharge port is formed on the first side of the scraper fixing member; the powder passing chamber is constructed to have a first powder passing wall and a second powder passing wall that are parallel to each other and opposite to each other, and the distance between the first powder passing wall and the second powder passing wall is a first spacing; the first spacing is 8 mm ~ 15 mm; the powder passing chamber also has a first buffer wall and a second buffer wall that are opposite to each other; the first buffer wall and the second buffer wall cooperate to form the powder discharge port with a second spacing; the second spacing is 3 mm ~ 6 mm; Wherein, a buffer groove is further provided on the first side of the scraper fixing member, and the buffer groove includes a first buffer groove having a first overflow port and a second buffer groove having a second overflow port; The first buffer trough is located between the first scraper and the powder discharge port and faces the workbench with the first overflow port, and the second buffer trough is located between the second scraper and the powder discharge port and faces the workbench with the second overflow port, so that the additive powder discharged from the powder discharge port enters the first buffer trough through the first overflow port and enters the second buffer trough from the second overflow port.

2. The scraper mechanism according to claim 1, characterized in that: The flatness of the first blade surface and the second blade surface is set to 0.03 mm to 0.05 mm.

3. The scraper mechanism according to claim 2, characterized in that: The first height difference is 2 mm to 3 mm.

4. The scraper mechanism according to claim 1, characterized in that: The first buffer wall is connected to the first powder passing wall and is located downstream of the first powder passing wall in the powder falling direction; The second buffer wall is connected to the second powder passing wall and is located downstream of the second powder passing wall in the powder falling direction.

5. The scraper mechanism according to claim 4, characterized in that: In the powder falling direction, the first buffer wall is inclined relative to the first powder passing wall toward the central axis of the powder passing chamber, and the angle between the first buffer wall and the horizontal plane is a first repose angle; The second buffer wall is inclined relative to the second powder passing wall toward the central axis of the powder passing chamber, and the angle between the second buffer wall and the horizontal plane is a second repose angle; The first repose angle is the minimum angle formed by the first buffer wall and the horizontal plane when the first buffer wall causes the additive powder placed thereon to be in a critical state of sliding down along the first buffer wall; The second repose angle is the minimum angle formed by the second buffer wall and the horizontal plane when the second buffer wall causes the additive powder placed thereon to be in a critical state of sliding down along the second buffer wall.

6. A powder spreading device, used to move along a powder spreading route and spread additive powder on a workbench of an additive manufacturing device, characterized in that: The powder spreading device comprises a powder dispensing mechanism and a scraper mechanism as claimed in any one of claims 1 to 5; The powder dispensing mechanism comprises a powder dispensing seat and a powder dispensing component arranged in the powder dispensing seat; The powder dispensing seat is provided with a powder input area and a powder output area; The powder outlet area is communicated with the powder passing chamber.

7. A powder supply and spreading device, characterized in that: It comprises a powder supply device and a powder spreading device as claimed in claim 6; The powder supply device is arranged above the powder spreading device, and the powder supply device is used to transport the additive powder to the powder input area.

8. An additive manufacturing device, characterized in that: It comprises a workbench and the powder supplying and spreading device as claimed in claim 7; The powder spreading device is located above the workbench and can move along the powder spreading route of the workbench. The powder spreading device is used to spread the additive powder distributed by the powder mixing component to the powder outlet area onto the workbench.

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