CN116787768A - Small-size feeding structure - Google Patents

Abstract

The application discloses a small-volume feeding structure, which comprises: an extrusion wheel for extruding the printing filaments; the arc tooth disc is used for driving the extrusion wheel, and the arc tooth of the arc tooth disc drives the extrusion wheel in a decelerating manner to control extrusion and back suction of the printing material wire. The material wire passes through the center of the extruder, so that the extruder does not need to bias a reduction gearbox and a motor, and the volume and the gravity center of the extruder are well controlled. The feeding structure and the extruder using the same solve a series of negative problems brought by the traditional extruder in the related technology, and realize the high-performance extruder which has compact structure, small volume, light weight, low gravity center, small running torque, less requirement on material wires and strong suitability and is compatible with a large extrusion wheel.

Description

Small-size feeding structure

Technical Field

The application relates to the technical field of Fused Deposition Modeling (FDM) additive manufacturing, in particular to a feeding structure of a 3D printer.

Background

The 3D printing additive manufacturing technology has the advantages of low cost, no generation of scraps during work, no need of rapid mould proofing and the like, and has application prospects in industrial design, construction, engineering and construction (AEC), automobiles, aerospace, dental and medical industries, education, geographic information systems, civil engineering and other fields.

The basic principle of a Fused Deposition (FDM) technology printer commonly used in the art is to heat and melt the printed wire in the hot end, and to extrude it through the orifices of the nozzle. The extruded material is adhered to the panel or the cured material of the previous layer, and the final three-dimensional finished product is formed by stacking the materials layer by layer. While the structure of the extruded material is often referred to as an extruder.

The extruder of the 3d printer of the current FDM technology adopts a scheme of a reduction gearbox and a small motor for higher extrusion force and weight reduction.

However, the more gears of the reduction gearbox, the greater the volume and the higher the weight, and the need for finishing control of small backlash to ensure extruder draw-back response time.

To give way to the reduction gearbox, the motor is typically offset from the extruder population, resulting in an offset center of gravity and even high, which the inventors have found to cause the extruder fixture to have a large moment to shake the printhead during high speed printing.

The existing extruder adopts double extrusion wheels to occlude consumable materials, so that the diameter of the extrusion wheels is large in order to avoid scraping the consumable materials, but the reduction gearbox is far away from the extrusion wheels, and the large gravity center of the extruder is also deviated.

At present, in order to simplify the structure, an extruder with double extrusion wheels is generally provided with a scheme that one extrusion wheel is driven by the other extrusion wheel, and when the extruder works, meshing can be influenced by consumable materials, stress conditions are complex, and extrusion stability is influenced by interference from time to time.

Existing extruders are often limited in structure with the feed ports offset from the center of the extruder, which results in fit problems on some machines (e.g., delta-type and small machines).

While the screw extruder of the toothless screw principle solves the above problems, it can cause the wire to bear a torsional moment, which has an adverse effect on printing brittleness and flexible consumables.

With the diversification of printing wires, the trend of high-speed printers is that the high-speed operation can generate moment to influence the performance of the printer which is gradually improved obviously cannot be supported by the extruder with the printing quality.

In conclusion, designing a high-performance extruder which has compact structure, small volume, light weight, low gravity center, small running torque, less requirements on material wires and strong suitability is compatible with a large extrusion wheel, and becomes a technical problem which needs to be solved in the field of melt accumulation manufacturing.

Disclosure of Invention

The application provides a feeding structure for a 3D printing technology, which solves the negative problems brought by the traditional extruder structure in the related technology.

According to one aspect of the present application, there is provided a feeding structure for 3D printing technology, the structure comprising: the extrusion wheel is driven by the arc fluted disc and is used for extruding wires; and the arc fluted disc is used for driving the extrusion wheel and is a fluted disc-shaped part.

Further, the arc tooth disc is provided with an arc tooth and a supporting disc, the arc tooth is rigidly connected with the supporting disc, the arc tooth is meshed with the extrusion wheel or the idler wheel when in operation, and the supporting disc is provided with a through hole through which the material wire passes.

Still further, the number of the arc teeth is 1 to 6, and the arc teeth follow equidistant spiral line extension.

Still further, the number of the arc teeth is 1 to 4.

Still further, the number of the arc teeth is 2 or 3.

Still further, the number of the arc teeth is 2.

Still further, the extrusion wheel and the arc tooth disc form a speed reducing group when working, and the extrusion wheel is provided with teeth meshed with the arc tooth disc or the idler wheel.

Still further, the extrusion wheel has a diameter of 6mm to 30mm and 5 to 30 teeth.

Still further, the extrusion wheel has a diameter of 8mm to 16mm and 7 to 24 teeth.

Still further, the extrusion wheel has a diameter of 10mm to 14mm and 10 to 20 teeth.

The feeding structure solves the negative problems brought by the traditional extruder in the related technology, and realizes the high-performance extruder which has compact structure, small volume, light weight, low gravity center, small running torque, less requirement on material wires and strong suitability and is compatible with a large extrusion wheel.

Drawings

Embodiments of the application will now be described, by way of example only, with reference to the accompanying drawings, in which:

fig. 1 is a perspective view of a first embodiment, with a wire s, motor m added for the purpose of describing the function.

Fig. 2 is a top view of the first embodiment.

Fig. 3 is a perspective view of the first embodiment with the motor m removed.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

Referring now to fig. 1-2, there is shown an extruder population a according to a first example, the extruder population comprising: an extrusion wheel j for extruding wires and a curved fluted disc h for driving the extrusion wheel j.

In this embodiment, the arc tooth disc h is composed of an arc tooth h1 and a supporting disc h2, the arc tooth h1 directly drives the extrusion wheel j above or indirectly drives the extrusion wheel j through an idler wheel (not shown) during operation, the arc tooth h1 follows equidistant spiral line extension, and the extrusion wheel j is guaranteed to rotate at a constant speed. The change of the transmission ratio is realized through the number of the engaged arc teeth h1, so that the motor with different parameters can be conveniently adapted. The center of the supporting disc h2 is provided with a through hole h3, and the material wires s pass through the through hole h3 for extrusion.

The extrusion wheel j is formed by matching a tooth j1 and a material wheel j2, the tooth j1 is driven by the arc tooth h1, the material wheel j2 bites the material wire s to transmit force while rotating, and extrusion and back drawing of the material wire s are controlled.

Referring now to fig. 3, there is shown an extrusion architecture A1 omitting motor m, a large extrusion wheel j compatible with a deceleration architecture and not prone to wire damage, while being small; the center of gravity is low, so that the running moment of the printing head is reduced; the feeding port h3 is arranged at the center of the extruder A, so that the requirement of actual installation on the installation position is lowered.

It should be understood that in this specification, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., refer to an orientation or positional relationship or dimension based on that shown in the drawings, which are used for convenience of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the scope of protection of the present application.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The instant specification provides many different embodiments, or examples, that can be used to implement the present application. It should be understood that these various embodiments or examples are purely illustrative and are not intended to limit the scope of the application in any way. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application. The scope of the application should therefore be determined by the following claims.

Claims (10)

1. A small-volume feed structure, comprising: the extrusion wheel is driven by the arc fluted disc and is used for extruding wires; and the arc fluted disc is used for driving the extrusion wheel and is a fluted disc-shaped part.

2. The arced tooth plate as claimed in claim 1, wherein: the extrusion device comprises an arc tooth and a supporting disc, wherein the arc tooth is rigidly connected with the supporting disc, the arc tooth is meshed with the extrusion wheel or the idler wheel when working, and the supporting disc is provided with a through hole through which the material wire passes.

3. The curved tooth as claimed in claim 2, wherein: the number of the arc teeth is 1 to 6, and the arc teeth extend along equidistant spiral lines.

4. The curved tooth as claimed in claim 2, wherein: the number of the arc teeth is 1 to 4.

5. The curved tooth as claimed in claim 2, wherein: the number of the arc teeth is 2 or 3.

6. The curved tooth as claimed in claim 2, wherein: the number of the arc teeth is 2.

7. The extrusion wheel of claim 1, wherein: the extrusion wheel and the arc fluted disc form a speed reducing group when in operation, and the extrusion wheel is provided with teeth meshed with the arc fluted disc or the idler wheel.

8. The extrusion wheel of claim 7, wherein: the diameter of the extrusion wheel is 6mm to 30mm, and the number of the teeth is 5 to 30.

9. The extrusion wheel of claim 7, wherein: the diameter of the extrusion wheel is 8mm to 16mm, and the number of the teeth is 7 to 24.

10. The extrusion wheel of claim 7, wherein: the diameter of the extrusion wheel is 10mm to 14mm, and the number of the teeth is 10 to 20.