Consumable conveying mechanism for miniature 3D printer

Abstract

The utility model relates to the technical field of 3D printers, in particular to a consumable conveying mechanism for a miniature 3D printer, which comprises a hollow shaft stepping motor and a connecting plate fixed with the hollow shaft stepping motor, the connecting plate is connected with two feeding wheels through a first support, and the two feeding wheels are symmetrically arranged based on the central axis of the hollow shaft stepping motor. The first support and the connecting plate are connected through a sliding rail. The connecting plate is connected with a first transmission shaft through a second support and connected with a second transmission shaft through a third support. The feeding wheel and the first transmission shaft are in transmission through a bevel gear set, the first transmission shaft and the second transmission shaft are in transmission through a bevel gear set, and the second transmission shaft and a rotating shaft of the hollow shaft stepping motor are in transmission through a bevel gear set. According to the utility model, filaments pass through the hollow shaft of the stepping motor, so that the occupied space of consumables outside the stepping motor is reduced, and the consumables are prevented from being interfered when entering the feeding wheel; consumable materials are evenly stressed, and feeding stability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printers, in particular to a consumable conveying mechanism for a micro 3D printer. Background Art

[0002] With the rapid development of 3D printing technology, micro 3D printers have been widely used in scientific research, education, creative design and other fields due to their small size and strong portability. As a key component in a micro 3D printer, the consumable conveying mechanism also needs to continuously develop towards miniaturization. While improving technology to reduce its volume, it is also necessary to ensure the stability of material feeding. Summary of the Invention

[0003] The purpose of the utility model is to provide a consumable conveying mechanism for a micro 3D printer.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] A consumable conveying mechanism for a micro 3D printer includes a hollow shaft stepper motor and a connecting plate fixed thereto. The connecting plate is connected with a feeding wheel through a first bracket. The number of the feeding wheels is two and they are symmetrically arranged based on the central axis of the hollow shaft stepper motor. The first bracket and the connecting plate are connected through a slide rail;

[0006] The connecting plate is connected with a first transmission shaft through a second bracket, and the connecting plate is connected with a second transmission shaft through a third bracket;

[0007] The feeding wheel and the first transmission shaft are driven by a bevel gear set. The first transmission shaft and the second transmission shaft are driven by a bevel gear set. The second transmission shaft and the rotating shaft of the hollow shaft stepper motor are driven by a bevel gear set;

[0008] The bevel gears near the two ends of the first transmission shaft along the axis can move linearly along the central axis of the first transmission shaft, and compression springs are arranged between these two bevel gears and the second bracket;

[0009] An anti-wear ring is arranged at one end of the rotating shaft of the hollow shaft stepper motor away from the connecting plate.

[0010] Further, a tooth groove is arranged on the periphery of the first transmission shaft and is matched with a bevel gear sleeved on the periphery in a sliding manner. The compression spring presses the movable bevel gear on the first transmission shaft towards the central axis of the nearest feeding wheel.

[0011] Further, the central axes of the first transmission shaft and the second transmission shaft are perpendicular to each other, and the central axes of the second transmission shaft and the rotating shaft of the hollow shaft stepper motor are parallel to each other.

[0012] Further, the anti-wear ring includes a first ring and a second ring. The first ring and the second ring are connected by a bearing with coincident central axes. The first ring is synchronized with the rotation shaft of the hollow shaft stepper motor in operation. The inner periphery of the second ring is provided with a chamfered opening whose diameter gradually decreases towards the hollow shaft stepper motor.

[0013] Further, the hollow shaft stepper motor and the connecting plate are connected by screws.

[0014] The beneficial effects of adopting the technical solution of the present utility model are as follows:

[0015] The consumable conveying mechanism for the micro 3D printer of the present utility model has a compact structure and reasonable design, can effectively improve the stability and efficiency of consumable conveying, and reduce the risk of consumable wear. It enables the filamentous consumable to pass through the hollow shaft of the stepper motor, reducing the occupied space outside the stepper motor, and the hollow rotation shaft avoids interference to the consumable when it enters the feeding wheel; the power of the stepper motor is transmitted to the double feeding wheels, and the two rotate synchronously and in opposite directions to achieve forward feeding or backward retraction. The consumable is evenly stressed, ensuring the stability of feeding. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is Figure 1 the enlarged schematic diagram at A in

[0019] Figure 3 It is a front view schematic diagram of the present utility model;

[0020] Figure 4 It is a top view schematic diagram of the present utility model;

[0021] Figure 5 It is a cross-sectional structural schematic diagram of the anti-wear ring in the present utility model;

[0022] In the figure: 1, hollow shaft stepper motor; 2, connecting plate; 3, first bracket; 4, feeding wheel; 5, slide rail; 6, second bracket; 7, first transmission shaft; 7a, tooth groove; 8, third bracket; 9, second transmission shaft; 10, compression spring; 11, anti-wear ring; 11a, first ring; 11b, second ring; 11b-1, chamfered opening; 11c, bearing; 12, screw. Detailed implementation mode

[0023] The present utility model will be further described in detail below with reference to the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner. Therefore, they only show the components related to the present utility model and should not limit the scope of protection of the present utility model.

[0024] Please refer to Figures 1 to 4 , a consumable conveying mechanism for a micro 3D printer, including a hollow shaft stepper motor 1 and a connecting plate 2 fixed thereto. The hollow shaft stepper motor 1 and the connecting plate 2 are connected by screws 12; the connecting plate 2 is connected with a feeding wheel 4 through a first bracket 3. The number of feeding wheels 4 is 2 and the two are symmetrically arranged based on the central axis of the hollow shaft stepper motor 1. The first bracket 3 and the connecting plate 2 are connected by a slide rail 5. Therefore, the distance between the two feeding wheels 4 is variable;

[0025] The connecting plate 2 is connected with a first transmission shaft 7 through a second bracket 6, and the connecting plate 2 is connected with a second transmission shaft 9 through a third bracket 8; the feeding wheel 4 and the first transmission shaft 7 are driven by a bevel gear set, the first transmission shaft 7 and the second transmission shaft 9 are driven by a bevel gear set, and the second transmission shaft 9 and the rotating shaft of the hollow shaft stepper motor 1 are driven by a bevel gear set; the central axes of the first transmission shaft 7 and the second transmission shaft 9 are perpendicular to each other, and the central axis of the second transmission shaft 9 and the rotating shaft of the hollow shaft stepper motor 1 are parallel to each other. As the rotating shaft of the hollow shaft stepper motor 1 rotates, through the transmission of multiple bevel gear sets, the double feeding wheels 4 are driven to rotate in the opposite direction, and the consumables sandwiched between the double feeding wheels 5 are displaced. By controlling the rotation direction of the rotating shaft of the hollow shaft stepper motor 1, the feeding or retraction of the consumables is realized.

[0026] In order to make the double feeding wheels 4 clamp the consumables in the middle in an opposite direction, the bevel gears near the two ends of the first transmission shaft 7 can move linearly along the central axis of the first transmission shaft 7, and a compression spring 10 is arranged between these two bevel gears and the second bracket 6; the number of bevel gears on the first transmission shaft 7 is 3. The middle one is fixed for transmission with the hollow shaft stepper motor 1, and the two ends are movable for transmission with the feeding wheel 4; specifically, a tooth groove 7a is arranged on the periphery of the first transmission shaft 7 and is matched with the bevel gear sleeved on the periphery and slidingly. The bevel gear sleeved on the periphery of the tooth groove 7a rotates synchronously with the first transmission shaft 7 and can move axially based on it. The compression spring 10 squeezes the movable bevel gear on the first transmission shaft 7 towards the central axis of the nearest feeding wheel 4. At the same time, in cooperation with the slide rail 5, the double feeding wheels 4 clamp the consumables between them in an opposite direction, ensuring the stability of feeding.

[0027] Because the consumables pass through the rotating shaft of the said hollow shaft stepper motor 1, in order to prevent the rotating shaft from wearing the consumables at the inlet, an anti-wear ring 11 is arranged at one end of the rotating shaft of the hollow shaft stepper motor 1 away from the connecting plate 2; specifically, as Figure 5As shown, the wear-resistant ring 11 includes a first ring 11a and a second ring 11b. The first ring 11a and the second ring 11b are connected by a bearing 11c with coincident central axes. The first ring 11a moves synchronously with the rotating shaft of the hollow shaft stepper motor 1. A chamfered opening 11b-1 with a gradually decreasing diameter towards the hollow shaft stepper motor 1 is provided inside the second ring 11b. The chamfered opening 11b-1 facilitates the entry of the consumable into the rotating shaft of the hollow shaft stepper motor 1. The consumable has no contact with the first ring 11a that rotates with the rotating shaft of the stepper motor, and the second ring 11b separates the consumable from the rotating shaft of the stepper motor.

[0028] The consumable conveying mechanism for the micro 3D printer of the present utility model enables the filamentous consumable to pass through the hollow shaft of the stepper motor, reducing the occupied space outside the stepper motor, and the hollow rotating shaft avoids interference to the consumable when it enters the feeding wheel 4; the power of the stepper motor is transmitted to the double feeding wheels 4, and the two rotate synchronously and in opposite directions to achieve forward feeding or backward retraction. The consumable is evenly stressed, ensuring the feeding stability.

[0029] The above is only the preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. It should be noted that for those of ordinary skill in the art, any changes, modifications or additions made without departing from the concept of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A consumables conveying mechanism for a micro 3D printer, characterized in that: It comprises a hollow shaft stepper motor (1) and a connecting plate (2) fixed thereto, wherein the connecting plate (2) is connected to a feeding wheel (4) via a first bracket (3), the number of the feeding wheels (4) is two and the two feeding wheels (4) are symmetrically arranged based on the central axis of the hollow shaft stepper motor (1), and the first bracket (3) and the connecting plate (2) are connected via a slide rail (5); The connecting plate (2) is connected to a first transmission shaft (7) via a second bracket (6), and the connecting plate (2) is connected to a second transmission shaft (9) via a third bracket (8); The feed wheel (4) and the first transmission shaft (7) are driven by a bevel gear set, the first transmission shaft (7) and the second transmission shaft (9) are driven by a bevel gear set, and the second transmission shaft (9) and the rotating shaft of the hollow shaft stepping motor (1) are driven by a bevel gear set; The bevel gears on the first transmission shaft (7) close to the two ends of the shaft can move linearly along the central axis of the first transmission shaft (7), and a compression spring (10) is arranged between the two bevel gears and the second bracket (6).

2. The consumables conveying mechanism for a micro 3D printer according to claim 1, characterized in that: The first transmission shaft (7) is provided with a tooth groove (7a) on the periphery thereof and cooperates with a bevel gear slidably sleeved on the periphery thereof. The compression spring (10) presses the movable bevel gear on the first transmission shaft (7) toward the central axis of the nearest feeding wheel (4).

3. The consumables conveying mechanism for a micro 3D printer according to claim 2, characterized in that: The central axes of the first transmission shaft (7) and the second transmission shaft (9) are perpendicular to each other, and the central axes of the second transmission shaft (9) and the rotating shaft of the hollow shaft stepping motor (1) are parallel to each other.

4. The consumables conveying mechanism for a micro 3D printer according to claim 1, characterized in that: An anti-wear ring (11) is provided at one end of the rotating shaft of the hollow shaft stepping motor (1) away from the connecting plate (2).

5. The consumables conveying mechanism for a micro 3D printer according to claim 4, characterized in that: The anti-wear ring (11) comprises a first ring (11a) and a second ring (11b); the first ring (11a) and the second ring (11b) are connected via a bearing (11c) whose central axes coincide with each other; the first ring (11a) and the rotating shaft of the hollow shaft stepping motor (1) move synchronously; and the second ring (11b) is provided with a chamfered opening (11b-1) whose diameter gradually decreases toward the direction of the hollow shaft stepping motor (1) on its inner periphery.

6. The consumables conveying mechanism for a micro 3D printer according to claim 1, characterized in that: The hollow shaft stepping motor (1) and the connecting plate (2) are connected via screws (12).

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