Metal framework scraper and scraper assembly

Abstract

According to the metal framework scraper and the scraper assembly, a metal scraper framework comprises a framework body, a pressing locking assembly and a blade, the framework body is rigid and is in a long strip shape, and a plurality of first grooves for the pressing locking assembly to be inserted are formed in the top of the framework body at intervals; the bottom of the framework is upwards provided with a second groove communicated with the first groove, the cross section of the cutting edge is in a T shape or a wedge shape, and the cutting edge is embedded in the second groove matched with the cutting edge in shape and located at the bottoms of the downward-pressing locking assemblies so as to be tightly attached to the framework under the pressing effect of the downward-pressing locking assemblies. According to the metal framework scraper, after the blade is abraded, only the blade needs to be replaced, and the framework and the pressing-down locking assembly only provide the overall rigidity and the installation precision of the scraper, do not directly participate in powder laying of the scraper and are free of loss, so that the metal framework scraper can be repeatedly used, and the use cost of the scraper is reduced; in addition, the blade is simple and efficient to disassemble and assemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of additive manufacturing, and particularly relates to a metal skeleton scraper and a scraper assembly. Background Art

[0002] The basic process of selective laser sintering is as follows: the powder feeding device delivers a certain amount of powder to the work surface, the powder spreading scraper spreads a layer of powder material on the upper surface of the formed part in the forming cylinder, and the galvanometer system controls the laser to scan the solid part of the powder layer according to the cross-sectional contour of the layer, so that the powder melts and bonds with the formed part below; when one layer of cross section is sintered, the work table drops one layer of thickness, and the powder spreading scraper spreads another layer of uniform and dense powder on it, and scans and sinters a new layer of cross section. After several layers of scanning and superposition, the entire prototype manufacturing is completed.

[0003] During the selective laser sintering process, the scraper typically needs to be coated with powder thousands of times. Furthermore, the part's molding is affected by laser scanning, airflow quality, and its own thermal stress, making the surface prone to wrinkling and warping. This can cause intense friction and even impact on the scraper, resulting in a short scraper life and high wear and tear. Currently, scrapers can be divided into hard scrapers, rubber scrapers, and metal-framed rubber-bladed scrapers based on their material. Hard scrapers are machined from high-hardness materials such as alloys and ceramics, offering high dimensional accuracy. However, they come into rigid contact with the part surface during operation, which can easily damage the part or scraper. Rubber scrapers are more tolerant to sintering defects on the part surface, but their accuracy is poor due to processing technology and thermal deformation. Metal-framed rubber-bladed scrapers typically use a metal frame as a rigid base, with a rubber blade bonded underneath, and then machined to precise working accuracy. This type of scraper combines the advantages of both hard and rubber scrapers, but cleaning the worn rubber surface is complex, and the metal frame must be replaced along with the worn rubber blade, resulting in low reuse rates and high operating costs. Utility Model Content

[0004] In order to solve the above-mentioned technical problems existing in the prior art, the utility model provides a metal skeleton scraper and a scraper assembly. After the blade of the metal skeleton scraper is worn, only the blade needs to be replaced, and the skeleton and the downward locking assembly can be reused, which reduces the cost of using the scraper; moreover, the disassembly and assembly of the blade is simple and efficient.

[0005] To achieve the above-mentioned purpose, the utility model provides a metal skeleton scraper, including a skeleton, a downward pressing locking assembly and a blade. The skeleton is made of a rigid material and is in the shape of a long strip. The top of the skeleton is provided with a plurality of first grooves for inserting the downward pressing locking assembly at intervals. The bottom of the skeleton is upwardly provided with a second groove connected to the first groove. The cross-section of the blade is T-shaped or wedge-shaped. The blade is embedded in the second groove matching its shape and is located at the bottom of several downward pressing locking assemblies so as to fit tightly on the skeleton under the pressing action of several downward pressing locking assemblies.

[0006] As a further preferred embodiment of the present invention, when the blade is made of rubber, the downward pressing locking assembly includes a movable pressure plate and several top screws, the cross-sections of the second groove and the blade are both T-shaped, the top screw is inserted into the first groove, and the movable pressure plate is arranged between the bottom of the several top screws and the top of the blade, so that the movable pressure plate is pressed downward by tightening the several top screws, thereby making the blade evenly adhere to the groove wall of the second groove.

[0007] As a further preferred embodiment of the present invention, a carbon fiber sheet is provided inside the blade, the height of the carbon fiber sheet is less than the height of the blade, and the distance from the bottom of the blade is greater than or equal to 2 mm, and the bottom thickness of the blade is 1 mm-2 mm.

[0008] As a further preferred solution of the present invention, the skeleton is made of metal, and the movable pressing plate and the groove wall of the second groove are clearance-fitted.

[0009] As a further preferred embodiment of the present invention, when the blade is made of a rigid material, the downward-pressing locking assembly includes a plurality of elastic components, the cross-sections of the second groove and the blade are both wedge-shaped, the elastic component is inserted into the first groove, and is located at the top of the blade, so that the blade is pressed downward by a plurality of elastic components so as to be evenly attached to the groove wall of the second groove.

[0010] As a further preferred solution of the present invention, the elastic component is a ball plunger.

[0011] As a further preferred solution of the present invention, the blade is made of metal.

[0012] The utility model also provides a scraper assembly, which comprises a mounting frame and any one of the metal skeleton scrapers described above, wherein the metal skeleton scraper is mounted on the bottom of the mounting frame through side pressure plates on one side or both sides.

[0013] As a further preferred solution of the present invention, a powder storage tank is provided downwardly on the top of the mounting frame.

[0014] As a further preferred embodiment of the present invention, there are two metal skeleton scrapers, two side pressure plates, and mounting steps on both sides of the bottom of the mounting frame. One side of the metal skeleton scraper is located on the mounting step of the mounting frame, and the other side is fixedly mounted on the bottom of the mounting frame through the side pressure plate.

[0015] The utility model provides a metal skeleton scraper and scraper assembly, wherein the metal scraper skeleton includes a skeleton, a downward pressing locking assembly and a blade. The material of the skeleton is rigid and the shape is an elongated strip. The top of the skeleton is provided with a plurality of first grooves for inserting the downward pressing locking assembly at intervals. The bottom of the skeleton is upwardly provided with a second groove connected to the first groove. The cross section of the blade is T-shaped or wedge-shaped. The blade is embedded in the second groove matching its shape and is located at the bottom of a plurality of downward pressing locking assemblies so as to fit tightly to the skeleton under the pressing action of a plurality of downward pressing locking assemblies, so that the metal skeleton scraper only needs to replace the blade after the blade is worn. The skeleton and the downward pressing locking assembly only provide the overall rigidity and installation accuracy of the scraper and do not directly participate in the powder spreading of the scraper, so there is no loss, and therefore can be reused many times, which reduces the use cost of the scraper. Moreover, the disassembly and assembly of the blade of the utility model is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An axonometric view of an embodiment of the metal skeleton scraper provided by the utility model;

[0017] Figure 2 for Figure 1 sectional view of

[0018] Figure 3 A schematic structural diagram of an embodiment of the blade provided in the utility model;

[0019] Figure 4 A cross-sectional view of another embodiment of the metal skeleton scraper provided by the utility model;

[0020] Figure 5 The present invention provides a schematic structural diagram of a scraper assembly according to an embodiment of the present invention.

[0021] The components in the figure are marked as follows:

[0022] 1. Frame, 2. Blade, 3. Press-down locking assembly, 4. Mounting frame, 5. Side pressure plate, 6. Bolt, 7. Metal frame scraper, 1-1. First groove, 1-2. Second groove, 2-1. Carbon fiber sheet, 3-1. Movable pressure plate, 3-2. Top screw, 3-3. Ball plunger. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the following will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, the metal skeleton scraper of this embodiment includes a skeleton 1, a push-down locking assembly 3 and a blade 2. The skeleton 1 is made of a rigid material and is in the shape of an elongated strip. The top of the skeleton 1 is provided with a plurality of first slots 1-1 for inserting the push-down locking assembly 3 at intervals. The bottom of the skeleton 1 is provided with a second slot 1-2 connected to the first slot 1-1. The cross section of the blade 2 is T-shaped or wedge-shaped. The blade 2 is embedded in the second slot 1-2 that matches its shape and is located at the bottom of the plurality of push-down locking assemblies 3 so as to fit tightly to the skeleton 1 under the pressure of the plurality of push-down locking assemblies 3. When the blade 2 is worn after long-term use, the blade 2 can be loosened by pressing the locking assembly 3, and the metal skeleton scraper can be replaced by quickly replacing the blade 2. Therefore, the cost of using the metal skeleton scraper can be greatly reduced.

[0025] As a preferred solution of this embodiment, Figure 2 As shown, when the blade 2 is made of rubber, the downward pressing locking assembly 3 includes a movable pressing plate 3-1 and a plurality of top screws 3-2. The cross-sections of the second groove 1-2 and the blade 2 are both T-shaped. The top screws 3-2 are inserted into the first groove 1-1. The movable pressing plate 3-1 is arranged between the bottom of the plurality of top screws 3-2 and the top of the blade 2. By tightening the plurality of top screws 3-2 downward, the movable pressing plate 3-1 is pressed downward, thereby making the blade 2 and the groove wall of the second groove 1-2 evenly close, that is, ensuring the vertical accuracy of the working surface. Moreover, the preferred embodiment utilizes the rigidity of the movable pressing plate 3-1 to transform the local point contact of the top screw 3-2 into surface contact, thereby making the matching accuracy of the blade 2 and the skeleton 1 higher.

[0026] More preferably, Figure 3 As shown, the interior of the blade 2 is provided with a carbon fiber sheet 2-1 or other rigid material sheet. The carbon fiber sheet 2-1 is shorter than the height of the blade 2 and is at least 2 mm from the bottom of the blade 2. The bottom thickness of the blade 2 is 1 mm to 2 mm. This not only increases the rigidity and precision of the blade 2 itself, but also reduces thermal deformation during operation due to the reduced amount of rubber used, further improving the stability of the scraper.

[0027] In a specific implementation, the skeleton 1 is made of metal, and the movable pressing plate 3 - 1 is clearance-fitted with the wall of the second groove 1 - 2 .

[0028] As another preferred solution of this embodiment, Figure 4As shown, when the blade 2 is made of a rigid material, the downward pressing locking assembly 3 includes several elastic components. The cross-sections of the second groove 1-2 and the blade 2 are both wedge-shaped. The elastic component is inserted into the first groove 1-1 and located on top of the blade 2, so that the blade 2 is pressed downward by the elastic components so that the blade 2 is evenly attached to the groove wall of the second groove 1-2. In this preferred embodiment, due to the good rigidity of the blade 2 itself, there is no need for a movable pressure plate 3-1 to evenly bear the force; the elastic component replaces the top screw 3-2. When the workpiece surface warps or other defects occur during actual use, the blade 2 can be lifted up a certain distance to avoid them, which can avoid adverse situations such as collisions to a certain extent. This not only fully utilizes the high precision of the hard scraper, but also greatly improves the stability of the printing process and the service life of the scraper.

[0029] In a specific implementation, the elastic component is a ball plunger 3-3, and of course it can also be other components with elastic functions in the prior art, which will not be described in detail here. The material of the blade 2 is metal or other rigid materials.

[0030] like Figure 5 As shown, the present invention further provides a scraper assembly, which includes a mounting frame 4 and a metal frame scraper 7 as described in any of the above embodiments. The metal frame scraper 7 is mounted on the bottom of the mounting frame 4 via side pressure plates 5 on one or both sides. Specifically, the side pressure plates 5 are provided with a plurality of bolt holes evenly and spaced apart along the length of the metal frame scraper 7, so that a plurality of bolts 6 can be inserted into the bolt holes respectively, thereby fixing the metal frame scraper 7 to the mounting frame 4.

[0031] Preferably, a powder storage tank is provided downwardly from the top of the mounting frame 4, two metal skeleton scrapers are provided, two side pressure plates 5 are provided, and mounting steps are provided on both sides of the bottom of the mounting frame 4. One side of the metal skeleton scraper 7 is located on the mounting step of the mounting frame 4, and the other side is fixed to the bottom of the mounting frame 4 via the side pressure plates 5. The scraper assembly of this preferred solution can realize powder storage and bidirectional powder spreading functions, that is, the powder delivery and spreading efficiency is higher.

[0032] The above embodiments are merely preferred implementations of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention should be included in the scope of protection of the present invention. It should be noted that certain modifications and alterations that do not depart from the principles of the present invention should be considered as included in the scope of protection of the present invention.

Claims

1. A metal skeleton scraper, characterized in that, It includes a frame, a push-down locking assembly and a blade. The frame is made of rigid material and is in the shape of a long strip. The top of the frame is provided with a plurality of first grooves for inserting the push-down locking assembly at intervals. The bottom of the frame is provided with a second groove connected to the first groove. The cross-section of the blade is T-shaped or wedge-shaped. The blade is embedded in the second groove matching its shape and is located at the bottom of the plurality of push-down locking assemblies so as to fit tightly on the frame under the pressing action of the plurality of push-down locking assemblies.

2. The metal skeleton scraper according to claim 1, characterized in that: When the blade is made of rubber, the downward pressing locking assembly includes a movable pressure plate and a plurality of top screws. The cross-sections of the second groove and the blade are both T-shaped. The top screw is inserted into the first groove. The movable pressure plate is arranged between the bottom of the plurality of top screws and the top of the blade. By tightening downward through the plurality of top screws, the movable pressure plate is pressed to move downward, thereby making the blade evenly adhere to the groove wall of the second groove.

3. The metal skeleton scraper according to claim 2, characterized in that: A carbon fiber sheet is provided inside the blade. The height of the carbon fiber sheet is less than the height of the blade and the distance from the bottom of the blade is greater than or equal to 2 mm. The bottom thickness of the blade is 1 mm-2 mm.

4. The metal skeleton scraper according to claim 2, characterized in that: The frame is made of metal, and the movable pressing plate is clearance-fitted with the groove wall of the second groove.

5. The metal skeleton scraper according to claim 1, characterized in that: When the blade is made of a rigid material, the downward pressing locking assembly includes a plurality of elastic components, the cross-sections of the second groove and the blade are both wedge-shaped, the elastic component is inserted into the first groove, and is located on the top of the blade, so that the blade is pressed downward by the plurality of elastic components so as to be evenly attached to the groove wall of the second groove.

6. The metal skeleton scraper according to claim 5, characterized in that: The elastic component is a ball plunger.

7. The metal skeleton scraper according to claim 5, characterized in that: The material of the blade is metal.

8. A scraper assembly, characterized in that: It comprises a mounting frame and the metal skeleton scraper according to any one of claims 1 to 7, wherein the metal skeleton scraper is mounted on the bottom of the mounting frame through side pressure plates on one side or both sides.

9. The scraper assembly according to claim 8, characterized in that A powder storage tank is downwardly opened on the top of the mounting frame.

10. The scraper assembly according to claim 8 or 9, characterized in that: There are two metal skeleton scrapers, two side pressure plates, and mounting steps on both sides of the bottom of the mounting frame. One side of the metal skeleton scraper is located on the mounting step of the mounting frame, and the other side is fixed to the bottom of the mounting frame through the side pressure plate.

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