A powder compacting mechanism capable of improving the uniformity of the density of a compact

Abstract

The utility model discloses a kind of powder laying mechanism capable of improving the density uniformity of compacted layer, it is related to 3D printing technical field, the powder laying mechanism includes the horizontal reciprocating mechanism being set on 3D printing equipment, the execution end of horizontal reciprocating mechanism is provided with the powder laying roller that can autorotation, and two powder scraping mechanism, powder laying roller is between two powder scraping mechanism, any powder scraping mechanism has powder scraping side, and the central axis of powder scraping side and powder laying roller of two powder scraping mechanism are parallel with the table top of the workbench of 3D printing equipment;In vertical direction, any powder scraping side is higher than the lower generatrix of powder laying roller.Horizontal reciprocating mechanism can make powder laying roller reciprocate, and it can be compacted to powder laying layer on workbench from left to right and from right to left;The existence of powder scraping mechanism makes that powder laying layer is first flattened before being compacted, and then powder laying roller is compacted, can ensure the uniformity of current entire compacted layer density, and further improve the quality of 3D printing finished product.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and more specifically, to a powder pressing mechanism that can improve the uniformity of compacted layer density. Background Technology

[0002] In binder jet 3D printing equipment, the powder spreader uses a high-speed rotating powder spreader roller to compact the powder surface. Before the powder spreader roller compacts the powder, the powder dispensing mechanism installed on the 3D printing equipment first spreads the powder onto the worktable surface of the 3D printing equipment, and then the powder spreader roller compacts it.

[0003] During the compaction process, the distance between the powder-spreading roller and the worktable of the 3D printing equipment is fixed. If powder accumulates on the worktable during the material feeding process, the powder-spreading roller will sequentially pass through the non-powder-accumulated area and the powder-accumulated area in one compaction step. Since the amount of powder in the powder-accumulated area is greater than that in the non-powder-accumulated area, the following problem will occur after compaction: the density of the compacted layer after compaction in the powder-accumulated area will be greater than that in the non-powder-accumulated area. This will result in uneven density of the entire compacted layer, thus affecting the quality of the 3D printed product. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a powder compaction mechanism that can improve the uniformity of compaction layer density.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A powder compaction mechanism for improving the uniformity of compacted layer density includes a horizontal reciprocating moving mechanism mounted on a 3D printing equipment. The execution end of the horizontal reciprocating moving mechanism is provided with a self-rotating powder spreading roller and two powder scraping mechanisms. The powder spreading roller is located between the two powder scraping mechanisms. Each of the powder scraping mechanisms has a powder scraping side. The powder scraping sides of the two powder scraping mechanisms and the central axis of the powder spreading roller are parallel to the table surface of the 3D printing equipment. In the vertical direction, any powder scraping side is higher than the lower generatrix of the powder spreading roller.

[0007] Furthermore, in this utility model, any of the above-mentioned powder scraping mechanisms is a scraper disposed at the execution end of the above-mentioned horizontal reciprocating moving mechanism, the scraper is a long strip structure, and the bottom wall of any of the above-mentioned scraper is the powder scraping side.

[0008] Furthermore, in this utility model, the aforementioned horizontal reciprocating moving mechanism is a screw and nut mechanism, with a top plate provided on the nut, and the aforementioned powder spreading roller and the two aforementioned scrapers are spaced apart on the top plate.

[0009] Furthermore, in this utility model, a connecting frame is provided on the top plate, and both ends of the powder spreading roller are rotatably connected to the connecting frame.

[0010] Furthermore, in this invention, one end of the powder spreading roller is connected to a drive motor.

[0011] Furthermore, in this invention, the length direction of any of the aforementioned scrapers is parallel to the central axis of the aforementioned powder spreading roller.

[0012] The beneficial effects of this utility model are:

[0013] This invention provides a powder compaction mechanism that can improve the uniformity of compacted layer density. The horizontal reciprocating movement mechanism allows the powder spreading roller to move back and forth, compacting the powder layer on the worktable from left to right and from right to left. The presence of the powder scraping mechanism ensures that the powder layer is smoothed before compaction, and then the powder spreading roller compacts it, which can ensure the uniformity of the density of the entire compacted layer and thus improve the quality of the 3D printed product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the installation structure of the powder scraping mechanism according to an embodiment of the present invention.

[0016] In the diagram: 101-Horizontal reciprocating moving mechanism; 201-Powder spreading roller; 301-Powder scraping side; 401-Worktable; 501-Scraper; 601-Top plate; 701-Connecting frame; 801-Drive motor. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] Please see Figure 1 and Figure 2 This utility model provides a technical solution:

[0019] A powder compaction mechanism that can improve the uniformity of compacted layer density includes a horizontal reciprocating moving mechanism 101 installed on a 3D printing equipment. The execution end of the horizontal reciprocating moving mechanism 101 is equipped with a self-rotating powder spreading roller 201 and two powder scraping mechanisms. The powder spreading roller 201 is located between the two powder scraping mechanisms. Each powder scraping mechanism has a powder scraping side 301. The central axes of the powder scraping sides 301 of the two powder scraping mechanisms and the powder spreading roller 201 are parallel to the table surface of the worktable 401 of the 3D printing equipment. In the vertical direction, the powder scraping side 301 is higher than the lower generatrix of the powder spreading roller 201.

[0020] like Figure 1 As shown, the distance between the lower generatrix of the powder spreading roller 201 and the surface of the worktable 401 of the 3D printing equipment is fixed during the powder pressing process. When the powder dispensing mechanism (not shown in the figure) spreads powder, the powder thickness should be greater than the distance between the lower generatrix of the powder spreading roller 201 and the surface of the worktable 401 of the 3D printing equipment. In this way, as the powder spreading roller 201 moves to the left or right, it presses the powder higher than the lower generatrix of the powder spreading roller 201 into the powder layer below, thereby achieving compaction of the powder layer.

[0021] Preferably, in this embodiment, any scraping mechanism is a scraper 501 installed at the execution end of the horizontal reciprocating moving mechanism 101. The scraper 501 has a long strip structure, and the bottom wall of any scraper 501 is the scraping side 301. In other embodiments of this embodiment, the scraping mechanism can also be a round tube. If a round tube is used, its lower generatrix should be higher than the lower generatrix of the powder spreading roller 201 in the vertical direction after installation.

[0022] In this embodiment, the horizontal reciprocating moving mechanism 101 adopts a screw and nut mechanism, on which a top plate 601 is installed, and the powder spreading roller 201 and two scrapers 501 are installed on the top plate 601 at intervals.

[0023] To facilitate the installation of the powder spreading roller 201, a connecting frame 701 is installed on the top plate 601 in this embodiment, and the two ends of the powder spreading roller 201 are rotatably connected to the connecting frame 701.

[0024] In order to facilitate the rotation of the powder spreading roller 201 during the powder pressing process, in this embodiment, one end of the powder spreading roller 201 is connected to a drive motor 801.

[0025] Preferably, in this embodiment, the length direction of any scraper 501 is parallel to the central axis of the powder spreading roller 201.

[0026] Working principle:

[0027] After the powder-feeding mechanism spreads the powder onto the workbench 401, the installation height of the scraper 501, the installation height of the powder-spreading roller 201, and the powder-spreading thickness of the powder-feeding mechanism are determined in advance according to the compaction density requirements. Figure 1From this perspective, if the horizontal reciprocating moving mechanism 101 moves the powder spreading roller 201 to the right to perform compaction, the scraper 501 on the right will first smooth the powder spreading layer during the compaction process, and then the powder spreading roller 201 will compact it, thus ensuring the uniformity of the density of the entire compacted layer. The reverse is also true.

[0028] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A powder compaction mechanism that can improve the uniformity of compacted layer density, characterized in that: The application relates to a horizontal reciprocating moving mechanism (101) arranged on a 3D printing device, an end of the horizontal reciprocating moving mechanism (101) is provided with a self-rotating powder spreading roller (201), and two powder scraping mechanisms are arranged between the powder spreading roller (201), any powder scraping mechanism has a powder scraping side (301), the powder scraping sides (301) of the two powder scraping mechanisms and the central axis of the powder spreading roller (201) are all parallel to the table surface of a workbench (401) of the 3D printing device; in the vertical direction, any powder scraping side (301) is higher than the lower generatrix of the powder spreading roller (201).

2. The powder compacting mechanism capable of improving the density uniformity of a compacted layer according to claim 1, characterized in that: Any powder scraping mechanism is a scraper (501) arranged at the end of the horizontal reciprocating moving mechanism (101), the scraper (501) is in a strip-shaped structure, and the bottom wall of any scraper (501) is a powder scraping side (301).

3. The powder compacting mechanism capable of improving the density uniformity of a compacted layer according to claim 2, characterized in that: The horizontal reciprocating moving mechanism (101) is a screw nut mechanism, a top plate (601) is arranged on the screw nut, and the powder spreading roller (201) and the two scrapers (501) are arranged on the top plate (601) in a spaced mode.

4. The powder compacting mechanism capable of improving the density uniformity of a compacted layer according to claim 3, characterized in that: The top plate (601) is provided with a connecting frame (701), and the two ends of the powder spreading roller (201) are rotationally connected with the connecting frame (701) respectively.

5. The briquetting mechanism capable of improving the density uniformity of the compacted layer according to any one of claims 1-4, characterized in that: One end of the powder spreading roller (201) is drivingly connected with a driving motor (801).

6. The powder compacting mechanism capable of improving the density uniformity of a compacted layer according to claim 2, characterized in that: The length direction of any scraper (501) and the central axis of the powder spreading roller (201) are parallel to each other.

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