Discharging device for 3D additive printing

Abstract

The utility model belongs to the technical field of 3D printing, and discloses a discharging device for 3D additive printing, which comprises a material roll support frame and a material roll, the material roll is rotatably mounted on the inner side of the material roll support frame, a guide cylinder is mounted on the side wall of the material roll support frame, additive materials are wound on the material roll, a connecting plate is mounted on the lower wall of the guide cylinder, and the connecting plate is fixedly connected with the material roll support frame. The device comprises a connecting plate, a swing supporting rod is rotatably installed on the side wall of the connecting plate, a roller is installed at one end of the swing supporting rod, the roller is arranged above an additive material, and a friction plate is installed at the other end of the swing supporting rod. The end, provided with the roller, of the swing supporting rod rotates downwards under the action of gravity, meanwhile, the friction plate at the other end of the swing supporting rod is driven to rotate upwards and make contact with a material roll, the material roll is braked to stop rotating, and therefore rotation stopping of the material roll is achieved, and the phenomenon that additional materials are stacked at a material disc or an inlet of a material guide pipe, and loose winding is formed is avoided.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, specifically to a material output device for 3D additive printing. Background Technology

[0002] At present, in the material feeding system of 3D printers, the additive material output device, that is, the roll of material wound with additives, is usually driven, and its rotation depends on the traction force of the feeding mechanism, that is, the feeding gear inside the printer.

[0003] However, if the gears in the feeding mechanism of the 3D printer are spinning idly but the material is not moving forward, the discharge device at the rear end may continue to release the material due to inertia, which may cause the material to accumulate in the material tray or at the inlet of the guide tube, forming a loose entanglement. The entangled material may even jam the gears, motor or guide tube, causing motor overload and damage to transmission components.

[0004] Therefore, a discharge device is needed that can automatically stop the material roll when it slips. Utility Model Content

[0005] The purpose of this utility model is to provide a feeding device for 3D additive printing, in order to solve the problem mentioned in the background art that when the gears in the feeding mechanism of the 3D printer are spinning idly but the material is not moving forward, the feeding device at the rear end is prone to continue releasing the material due to inertia, which may cause the material to accumulate at the material tray or the inlet of the guide tube, forming a loose entanglement. The entangled material may even jam the gears, motor or guide tube, resulting in motor overload and damage to transmission components.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a material feeding device for 3D additive printing, comprising a material roll support frame and a material roll, wherein a material roll is rotatably mounted on the inner side of the material roll support frame, a guide cylinder is installed on the side wall of the material roll support frame, additive material is wound on the material roll, and the additive material passes through the guide cylinder;

[0007] A connecting plate is installed on the lower wall of the guide cylinder, and a swing support rod is rotatably installed on the side wall of the connecting plate. A roller is installed at one end of the swing support rod, and the roller is positioned above the additive material. A friction plate is installed at the other end of the swing support rod, and the friction plate can fit against the side wall of the material roll.

[0008] As a preferred embodiment of this utility model, the side wall of the connecting plate is provided with a support shaft, the middle of the swing rod is provided with a connecting hole, the swing rod is rotatably mounted on the connecting plate through the connection hole and the support shaft, and a counterweight is installed on the side wall of the swing rod near the roller, the counterweight provides the roller with the pre-tightening force for pressing the additive material.

[0009] As a preferred embodiment of this utility model, the outer circumferential surface of the roller is fitted with an anti-slip rubber layer, and the surface of the anti-slip rubber layer is provided with annular grooves distributed circumferentially, into which the additive material can be inserted.

[0010] As a preferred embodiment of this utility model, the friction pad includes a substrate and a friction layer. The substrate is fixedly connected to the end of the swing support rod, and the friction layer is attached to the upper wall of the substrate. The friction layer is made of phenolic resin material.

[0011] As a preferred embodiment of this utility model, the side wall of the connecting plate is provided with a hole, which is located below the swing support rod. A limit pin is inserted into the hole, which can limit the maximum downward swing angle of the swing support rod.

[0012] As a preferred embodiment of this invention, the inlet end of the guide cylinder is provided with a flared opening.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This device, by setting its swing support rod, allows the roller to rotate with the movement of the material during normal additive material conveying, thus playing a tension adjustment role. When the gears of the external feeding mechanism are idle and the material is not advancing, the material roll continues to be released due to inertia, causing the material to loosen. At the same time, the end of the swing support rod with the roller rotates downward under the action of gravity, while driving the friction plate at the other end to rotate upward and contact the material roll, braking the material roll to stop its rotation. This achieves the purpose of stopping the rotation of the material roll, thereby avoiding the accumulation of additive material in the material tray or at the inlet of the guide tube, forming a loose entanglement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this patent;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle;

[0017] Figure 3 for Figure 1 Schematic diagram of the structure at point B.

[0018] In the diagram: 1. Material roll support frame, 2. Material roll, 3. Guide cylinder, 4. Additive material, 5. Connecting plate, 6. Swinging support rod, 7. Roller, 8. Friction plate, 9. Support shaft, 10. Connecting hole, 11. Counterweight, 12. Anti-slip rubber layer, 13. Annular groove, 14. Hole, 15. Limiting pin, 16. Trumpet mouth. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 This utility model provides a technical solution:

[0021] In this technical solution, a material feeding device for 3D additive printing includes a material roll support frame 1 and a material roll 2. The material roll 2 is rotatably mounted on the inner side of the material roll support frame 1. A guide cylinder 3 is installed on the side wall of the material roll support frame 1. Additive material 4 is wound on the material roll 2 and the additive material 4 passes into the guide cylinder 3.

[0022] A connecting plate 5 is installed on the lower wall of the guide cylinder 3. A swing support rod 6 is rotatably installed on the side wall of the connecting plate 5. A roller 7 is installed at one end of the swing support rod 6. The roller 7 is positioned above the additive material 4. A friction plate 8 is installed at the other end of the swing support rod 6. The friction plate 8 can fit against the side wall of the material roll 2.

[0023] In this technical solution, when the external feeding mechanism is working normally, the tension of the additive material 4 keeps the roller 7 in a high position and the friction plate 8 separates from the material roll 2; when slippage occurs, the material tension drops sharply, the swing support rod 6 rotates under the action of gravity or counterweight, and the friction plate 8 presses the material roll 2 to achieve braking.

[0024] In this paper, the inner diameter of the guide cylinder needs to be 0.5-1mm larger than the diameter of the additive material 4 to ensure that the material passes through smoothly without causing excessive shaking.

[0025] Meanwhile, the ratio of the distance from the middle of the swing support rod 6 to the roller 7 to the distance to the friction plate 8 is 1:2. According to the lever principle, during the rotation of the swing support rod, this lever arm ratio can make the braking force obtained by the friction plate 8 twice the force at the roller 7, effectively amplifying the braking force. Under a small change in the tension of the additive material, reliable braking of the material roll 2 can be achieved.

[0026] In some technical solutions, the side wall of the connecting plate 5 is provided with a support shaft 9, and the middle of the swing rod 6 is provided with a connecting hole 10. The swing rod 6 is rotatably mounted on the connecting plate 5 through the cooperation of the connecting hole 10 and the support shaft 9. A counterweight 11 is installed on the side wall of the swing rod 6 near the roller 7. The counterweight 11 provides the roller 7 with the pre-tightening force to press the additive material 4.

[0027] In this technical solution, the counterweight 11 is inserted into the side wall of the swing support rod 6 by a rod, so that the counterweight 11 can be easily replaced, thereby allowing the counterweight 11 to be replaced according to the type of additive material 4.

[0028] Specifically, a blind hole adapted to the rod body is opened on the side wall of the swing support rod 6, and an internal thread is provided in the blind hole. An external thread is provided on the rod body of the counterweight 11, so that the counterweight 11 can be conveniently installed and disassembled through the threaded connection.

[0029] In some technical solutions, the outer circumferential surface of the roller 7 is covered with an anti-slip rubber layer 12, and the surface of the anti-slip rubber layer 12 is provided with annular grooves 13 distributed in the circumferential direction, and the additive material 4 can be inserted into the annular grooves 13.

[0030] In some technical solutions, the friction plate 8 includes a substrate 81 and a friction layer 82. The substrate 81 is fixedly connected to the end of the swing support rod 6, and the friction layer 82 is attached to the upper wall of the substrate 81. The friction layer 82 is made of phenolic resin material.

[0031] In this technical solution, the friction layer 82 is mounted on the substrate 81 by adhesive bonding, which makes it easy to replace the friction layer 82 when it is excessively worn.

[0032] In some technical solutions, the side wall of the connecting plate 5 is provided with a hole 14, which is located below the swing support rod 6. A limit pin 15 is inserted into the hole 14, which can limit the maximum downward swing angle of the swing support rod 6.

[0033] In this technical solution, the hole 14 is a strip-shaped hole, and a locking ring and a locking nut are provided on the outside of the limiting pin 15. The locking ring and the locking nut are respectively provided on the front and rear sides of the connecting plate 5, so that the position of the limiting pin 15 can be fixed by tightening the locking nut.

[0034] Additionally, a buffer pad can be installed on the head of the limit pin 15 to prevent noise or damage from rigid collision with the swing rod 6.

[0035] In some technical solutions, the inlet end of the guide cylinder 3 is provided with a flared mouth 16.

[0036] In this technical solution, the flared opening 16 allows the additive material 4 to be inserted into the guide cylinder 3 more easily.

[0037] Working principle: When the external feeding mechanism is working normally, the additive material 4 is pulled out at a stable speed. At this time, the tension of the additive material 4 pushes the roller 7 upward, causing the swing rod 6 to rotate counterclockwise around the support shaft 9. The friction plate 8 separates from the side wall of the material roll 2, and the material roll 2 can rotate freely to release the additive material 4. When slippage occurs, the traction force of the feeding mechanism on the additive material 4 drops sharply, the tension of the additive material 4 decreases rapidly, and the swing rod 6 rotates clockwise around the support shaft 9 under the gravity of the counterweight 11. The friction plate 8 gradually presses against the side wall of the material roll 2, thereby increasing the friction force to brake the material roll 2 and prevent the additive material from being released excessively due to slippage.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A material feeding device for 3D additive printing, comprising a material roll support frame (1) and a material roll (2), characterized in that: A material roll (2) is rotatably mounted on the inner side of the material roll support frame (1), and a guide cylinder (3) is installed on the side wall of the material roll support frame (1). An additive material (4) is wound on the material roll (2), and the additive material (4) is inserted into the guide cylinder (3). A connecting plate (5) is installed on the lower wall of the guide cylinder (3). A swing support rod (6) is rotatably installed on the side wall of the connecting plate (5). A roller (7) is installed at one end of the swing support rod (6). The roller (7) is positioned above the additive material (4). A friction plate (8) is installed at the other end of the swing support rod (6). The friction plate (8) can fit against the side wall of the material roll (2).

2. The feeding device for 3D additive printing according to claim 1, characterized in that: The side wall of the connecting plate (5) is provided with a support shaft (9), and the middle part of the swing rod (6) is provided with a connecting hole (10). The swing rod (6) is rotatably mounted on the connecting plate (5) through the cooperation of the connecting hole (10) and the support shaft (9). A counterweight (11) is installed on the side wall of the swing rod (6) near the roller (7). The counterweight (11) provides the roller (7) with the preload force to press the additive material (4).

3. The feeding device for 3D additive printing according to claim 1, characterized in that: The outer circumferential surface of the roller (7) is covered with an anti-slip rubber layer (12), and the surface of the anti-slip rubber layer (12) is provided with annular grooves (13) distributed along the circumferential direction, and the additive material (4) can be inserted into the annular grooves (13).

4. The feeding device for 3D additive printing according to claim 1, characterized in that: The friction plate (8) includes a substrate (81) and a friction layer (82). The substrate (81) is fixedly connected to the end of the swing support rod (6). The friction layer (82) is attached to the upper wall of the substrate (81). The friction layer (82) is made of phenolic resin material.

5. The feeding device for 3D additive printing according to claim 1, characterized in that: The side wall of the connecting plate (5) has a hole (14) located below the swing support rod (6). A limit pin (15) is inserted into the hole (14) to limit the maximum downward swing angle of the swing support rod (6).

6. The feeding device for 3D additive printing according to claim 1, characterized in that: The inlet end of the guide tube (3) is provided with a flared mouth (16).

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