Powder spreading mechanism based on 3D printer and 3D printing device

Abstract

The utility model discloses a powder spreading mechanism based on a 3D printer and a 3D printing device, and the powder spreading mechanism comprises a translation cross beam frame capable of performing translation motion; the powder spreading roller body is arranged on the translation cross beam frame in a switching assembly manner; and two end parts of the driving rope body are positioned, and the driving rope body is assembled on the powder spreading roller body in a winding manner. According to the mechanism and the device, the powder spreading roller body can be effectively driven to translate corresponding to the powder spreading bed through the translating cross beam frame, and meanwhile, smooth low-vibration powder spreading can be effectively realized by utilizing the roller body transmission part based on the driving rope body under the friction driving action of the rope wheel, so that the stability of the flattening function of the powder bed is remarkably enhanced, and the functional practicability is improved.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing equipment technology, and more specifically, to a powder spreading mechanism and a 3D printing device based on a 3D printer. Background Technology

[0002] Currently, powder bed 3D printing technology requires lowering the forming platform by a specified height (called layer height or layer thickness) before printing each layer, and then spreading a layer of powder on top using a powder spreading mechanism. The smoothness of the powder surface determines the forming quality of the workpiece's upward-facing surface. If the powder surface is uneven, it may result in textures and unevenness. Therefore, for many powdery materials, a powder spreading mechanism is often needed. This mechanism not only drives translational movement but also incorporates controlled rotation to ensure the powder bed is leveled along the direction of travel.

[0003] The existing powder spreading mechanisms and their disadvantages mainly include the following:

[0004] 1. A scraper, either independent or fixed to the moving crossbeam, is used. However, this type has higher rigidity and exerts greater downward pressure on the powder bed, making it easier to push the workpiece away from the standard position, leading to printing failure.

[0005] 2. A powder-spreading roller that moves with the crossbeam and rotates during movement is used, with the rotation driven by a motor. However, this type of mechanism is heavy overall, and the power supply and signal cables for the motor need to reciprocate for a long time. In some scenarios, the printer's internal components need to be heated, which places high demands on the temperature resistance of the electronic and electrical components, making selection difficult and shortening the overall lifespan.

[0006] 3. A powder-spreading roller that moves with the crossbeam and can rotate during the movement is used. The rotation of the powder-spreading roller is driven by a gear and rack, with the gear and the powder-spreading roller coaxially driven. The rack extends along the direction of the crossbeam's movement and meshes with the gear. However, this design has high rotational resistance, which can easily cause uneven rotation. As a result, the powder-spreading surface forms a wavy texture due to the vibration caused by gear meshing, which is detrimental to the flatness of the powder bed. Utility Model Content

[0007] Therefore, this utility model provides a powder spreading mechanism and a 3D printing device based on a 3D printer to solve the above-mentioned technical problems in the powder bed spreading and leveling process in the prior art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A powder spreading mechanism based on a 3D printer includes:

[0010] The translation beam frame is capable of translational movement;

[0011] The powder spreading roller body is transferred and assembled on the translational crossbeam frame;

[0012] The driving rope is positioned at both ends and is wound around the powder spreading roller.

[0013] Based on the above technical solution, the present invention is further described as follows:

[0014] As a further embodiment of this utility model,

[0015] The translational crossbeam frame is capable of translational movement based on external driving force;

[0016] The powder spreading roller body is transferred and assembled at the lower part of the translational crossbeam frame, and at least one end of the powder spreading roller body is coaxially driven and equipped with a roller body transmission component.

[0017] The drive rope is wound around the roller transmission component between its two ends.

[0018] As a further embodiment of this utility model,

[0019] The roller transmission component is configured as at least one set of transmission shafts and / or transmission wheels;

[0020] At least one set of the drive shafts and / or the drive wheels are coaxially connected to at least one end of the powder spreading roller.

[0021] As a further embodiment of this utility model,

[0022] The contact length between the drive rope and at least one set of the drive shafts and / or the drive wheels is greater than half the circumference of the drive shafts and / or the drive wheels.

[0023] As a further embodiment of this utility model,

[0024] The drive rope is wound around the drive shaft and / or the drive wheel at least once.

[0025] As a further aspect of this utility model, it also includes:

[0026] Two sets of rope positioning seats are provided. The two ends of the driving rope are respectively fixedly mounted on the two sets of rope positioning seats. The extension direction of the driving rope between the two sets of rope positioning seats is perpendicular to the rotation direction of the powder spreading roller. The driving rope is wound around at least one set of the transmission shaft and / or the transmission wheel. When the powder spreading roller performs translational movement, the powder spreading roller can rotate based on the frictional drive of the rope wheel formed by the driving rope through the roller transmission component.

[0027] As a further embodiment of this utility model,

[0028] The top of the translation beam frame is equipped with a lifting drive mechanism, which drives the translation beam frame and the powder spreading roller to adjust their height.

[0029] As a further embodiment of this utility model,

[0030] Both sets of rope positioning seats are fixedly equipped with vertically controllable displacement limiting pulleys on their inner sides, and / or both sets of rope positioning seats are provided with rope tensioning mechanisms on their inner sides, with the tensioning kinetic energy output end of the rope tensioning mechanism being connected to the driving rope in a transmission manner.

[0031] As a further embodiment of this utility model,

[0032] The drive rope is configured as plastic monofilament and / or metal monofilament and / or monofilament with plastic coating and / or braided rope.

[0033] A 3D printing apparatus includes the powder spreading mechanism based on the 3D printer.

[0034] This utility model has the following beneficial effects:

[0035] This mechanism and device can effectively drive the powder spreading roller to move in tandem with the powder spreading bed by translating the crossbeam frame. At the same time, it can effectively achieve smooth and low-vibration powder spreading by using the roller transmission component based on the driving rope and the friction driving effect of the rope wheel. This significantly enhances the flatness and stability of the powder bed and improves its functionality and practicality. Attached Figure Description

[0036] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The structures, proportions, sizes, etc., drawn in this specification are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0037] Figure 1 This is a schematic diagram of the overall isometric structure of the powder spreading mechanism based on a 3D printer, provided for an embodiment of this utility model.

[0038] The attached diagram lists the components represented by each number as follows:

[0039] 1. Horizontal beam frame; 2. Powder spreading roller; 3. Roller transmission component; 4. Rope positioning seat; 5. Drive rope. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0041] The terms "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0042] like Figure 1 As shown, this utility model embodiment provides a powder spreading mechanism based on a 3D printer and a 3D printing device including the powder spreading mechanism. The powder spreading mechanism includes a translation beam 1, a powder spreading roller 2, a roller transmission component 3, a rope positioning seat 4, and a drive rope 5. The translation beam 1 effectively drives the powder spreading roller 2 to translate relative to the powder spreading bed. Simultaneously, the roller transmission component 3, driven by the drive rope 5 using rope wheel friction, effectively achieves smooth and low-vibration powder spreading, thereby significantly enhancing the stability of the powder bed's flatness function and improving the overall functionality and practicality. The specific settings are as follows:

[0043] Please refer to Figure 1 The translation beam 1 can move in the a direction based on external driving force. The powder spreading roller 2 is transferred and assembled at the lower part of the translation beam 1 so that the powder spreading roller 2 can move synchronously with the translation beam 1 to the range of the powder spreading bed.

[0044] The roller transmission component 3 is configured with at least one set of transmission shafts and / or transmission wheels, and the at least one set of transmission shafts and / or transmission wheels is coaxially connected to at least one end of the powder spreading roller 2. Two sets of rope positioning seats 4 are provided, and the two ends of the driving rope 5 are respectively fixedly mounted on the two sets of rope positioning seats 4. The extension direction of the driving rope 5 between the two sets of rope positioning seats 4 is perpendicular to the rotation direction of the powder spreading roller 2. The driving rope 5 is wound around at least one set of transmission shafts and / or transmission wheels. This is so that when the powder spreading roller 2 moves in the a direction, the powder spreading roller 2 can further achieve effective rotation in the b direction through the friction drive of the rope wheel formed by the driving rope 5 by the roller transmission component 3, thereby completing smooth and low-vibration powder spreading, significantly enhancing the functional stability when leveling the powder bed, and improving the overall functional practicality.

[0045] Specifically, the contact length between the drive rope 5 and at least one set of the drive shafts and / or the drive wheels is greater than half the circumference of the drive shafts and / or the drive wheels. Specifically, but not limited to, the drive rope 5 is wound around the drive shafts and / or the drive wheels at least one turn.

[0046] More specifically, the driving rope 5 is configured as plastic monofilament and / or metal monofilament and / or monofilament with plastic coating and / or braided rope. The material of the monofilament and / or the braided rope may be, but is not limited to, metal, carbon fiber, glass fiber, basalt fiber, ceramic fiber, or plastic fiber. The material of the plastic fiber may be, but is not limited to, thermoplastic or thermosetting plastic.

[0047] As a preferred embodiment, the top of the translation beam 1 is provided with a lifting drive mechanism, which is used to drive the translation beam 1 and the powder spreading roller 2 to adjust their height so as to flexibly adapt to the thickness of the powder bed leveling layer; the inner sides of the two sets of rope positioning seats 4 are all fixedly equipped with vertically controllable displacement limiting pulleys, which are used to limit the driving rope 5, and can further drive the driving rope 5 to adjust its height according to the powder spreading roller 2 by means of vertical displacement control.

[0048] As another preferred embodiment, the inner sides of both sets of rope positioning seats 4 are provided with rope tensioning mechanisms. The tensioning kinetic energy output end of the rope tensioning mechanism is connected to the driving rope 5 for transmission, so as to flexibly adjust the real-time tension performance of the driving rope 5 through the rope tensioning mechanism.

[0049] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A powder spreading mechanism based on a 3D printer, characterized in that, include: The translation beam frame is capable of translational movement; The powder spreading roller body is transferred and assembled on the translational crossbeam frame; The driving rope is positioned at both ends and is wound around the powder spreading roller.

2. The powder spreading mechanism based on a 3D printer according to claim 1, characterized in that, The translational crossbeam frame is capable of translational movement based on external driving force; The powder spreading roller body is transferred and assembled at the lower part of the translational crossbeam frame, and at least one end of the powder spreading roller body is coaxially driven and equipped with a roller body transmission component. The drive rope is wound around the roller transmission component between its two ends.

3. The powder spreading mechanism based on a 3D printer according to claim 2, characterized in that, The roller transmission component is configured as at least one set of transmission shafts and / or transmission wheels; At least one set of the drive shafts and / or the drive wheels are coaxially connected to at least one end of the powder spreading roller.

4. The powder spreading mechanism based on a 3D printer according to claim 3, characterized in that, The contact length between the drive rope and at least one set of the drive shafts and / or the drive wheels is greater than half the circumference of the drive shafts and / or the drive wheels.

5. The powder spreading mechanism based on a 3D printer according to claim 4, characterized in that, The drive rope is wound around the drive shaft and / or the drive wheel at least once.

6. The powder spreading mechanism based on a 3D printer according to claim 3, characterized in that, Also includes: Two sets of rope positioning seats are provided. The two ends of the driving rope are respectively fixedly mounted on the two sets of rope positioning seats. The extension direction of the driving rope between the two sets of rope positioning seats is perpendicular to the rotation direction of the powder spreading roller. The driving rope is wound around at least one set of the transmission shaft and / or the transmission wheel. When the powder spreading roller performs translational movement, the powder spreading roller can rotate based on the frictional drive of the rope wheel formed by the driving rope through the roller transmission component.

7. The powder spreading mechanism based on a 3D printer according to claim 6, characterized in that, The top of the translation beam frame is equipped with a lifting drive mechanism, which drives the translation beam frame and the powder spreading roller to adjust their height.

8. The powder spreading mechanism based on a 3D printer according to claim 7, characterized in that, Both sets of rope positioning seats are fixedly equipped with vertically controllable displacement limiting pulleys on their inner sides, and / or both sets of rope positioning seats are provided with rope tensioning mechanisms on their inner sides, with the tensioning kinetic energy output end of the rope tensioning mechanism being connected to the driving rope in a transmission manner.

9. The powder spreading mechanism based on a 3D printer according to claim 1, characterized in that, The drive rope is configured as plastic monofilament and / or metal monofilament and / or monofilament with plastic coating and / or braided rope.

10. A 3D printing apparatus, characterized in that, Includes the powder spreading mechanism based on a 3D printer as described in any one of claims 1-9.

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