Feeding mechanism of FDM 3D printer

Abstract

The utility model discloses a feeding mechanism of an FDM 3D printer, and relates to the technical field of printers. The 3D printer comprises a rack, a printing head assembly is installed on the rack, an L-shaped installation frame is fixedly installed at the top of the rack, a rotating roller is rotationally arranged above the vertical end of the installation frame, a containing disc is arranged on the rotating roller in a sleeved mode, and a first fixing plate is fixedly arranged on the lower surface of the top of the rack; by arranging the clamping rollers and the limiting rings, the unwinding ends of the consumables are limited and kept on a stable straight line, the consumables are prevented from swinging excessively at will in the traction process, the situation that the consumables are in excessive contact with the edges of the consumable placing discs is reduced, and the possibility of line breakage is effectively reduced; and meanwhile, when the limiting ring made of rubber swings at the end, close to the printing head, of the consumable, hard contact can be reduced, the probability of breakage is further reduced, and the continuity and stability of 3D printing are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of printer technology, specifically to a feeding mechanism for an FDM 3D printer. Background Technology

[0002] FDM materials are generally thermoplastic materials, such as wax, ABS, and nylon. They are fed in filaments. The material is heated and melted inside the nozzle, which moves along the cross-sectional contour and infill path of the part, extruding the molten material. The material solidifies rapidly and binds with the surrounding material. It is now commonly used in 3D printers as a consumable.

[0003] Now, after the filament tray on a 3D printer is installed on the printer frame, the filament is pulled through and fed into the printer head. It is then melted by the high temperature of the nozzle and extruded, thus achieving 3D printing. Firstly, on a 3D printer... Figure 1 As shown, the consumables do not have a limiting device and rely solely on the traction device at the print head for feeding. During this process, the print head moves in multiple directions along the X and Y axes, causing the consumables to swing around during traction. This can easily lead to excessive contact with the edge of the consumable placement tray, potentially causing line breakage. Furthermore, the consumables required for printing different products vary greatly. Currently, adjusting the traction device requires special tools and may even require replacing the rollers in the traction device, making the operation both inconvenient and cumbersome. Utility Model Content

[0004] In order to solve the above problems, the purpose of this utility model is to provide a feeding mechanism for an FDM 3D printer.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: a feeding mechanism for an FDM 3D printer, including a frame, a print head assembly mounted on the frame, an L-shaped mounting bracket fixedly mounted on the top of the frame, a rotating roller rotatably mounted above the vertical end of the mounting bracket, a placement disc sleeved on the rotating roller, a first fixing plate fixedly mounted on the lower surface of the top of the frame, a first rotating rod rotatably mounted on the first fixing plate, and a clamping roller fixedly mounted at one end of the first rotating rod directly above the working surface, a second fixing plate movably mounted at one end of the first fixing plate, a second rotating rod rotatably mounted on the second fixing plate, and a clamping roller identical to that on the first rotating rod fixedly mounted at the end of the second rotating rod, the two clamping rollers being arranged correspondingly, and an L-shaped support block mounted on the lower surface of the first fixing plate near the end of the second fixing plate and below the two clamping rollers, with limiting rings fixedly mounted at both the upper and lower ends of the support block;

[0006] A mounting block is fixedly provided on the lower surface of the first fixing plate, and a lead screw is threaded into the mounting block. A connecting block is fixedly provided on the lower surface of the second fixing plate, and the end of the lead screw is rotatably mounted on the connecting block through a bearing.

[0007] Preferably, a first long rod is provided on the side of the first fixed plate and the second fixed plate away from the clamping roller and between the first rotating rod and the second rotating rod. A second long rod is movably inserted at the end of the first long rod. A protruding limiting strip is provided on the surface of the second long rod. The ends of the first long rod and the second long rod are respectively connected to the first rotating rod and the second rotating rod through two meshing bevel gears. The end of the first long rod away from the first rotating rod is connected to the rotating roller through a belt drive.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. By setting clamping rollers and limiting rings, the unwinding end of the filament is limited, keeping it on a stable straight line. This prevents the filament from swinging excessively during traction, reduces excessive contact with the edge of the filament placement tray, and effectively reduces the possibility of filament breakage. At the same time, the rubber limiting rings reduce hard contact when the filament swings near the print head, further reducing the probability of breakage and ensuring the continuity and stability of 3D printing.

[0010] 2. When changing consumables of different diameters, the operator only needs to drive the rotating wheel to rotate the lead screw, and push the connecting block through the lead screw, thereby moving the second fixed plate to adjust the distance between the two clamping rollers. No special tools are required, and there is no need to replace the rollers in the traction device, which greatly improves the efficiency and convenience of operation, and makes it easy for the operator to quickly complete the adaptation and adjustment of consumables of different diameters. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the conventional structure of a current 3D printer.

[0013] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the mounting bracket structure of this utility model.

[0015] Figure 4This is a bottom view of the frame structure of this utility model.

[0016] Figure 5 For the present utility model Figure 4 Enlarged schematic diagram of point A in the middle.

[0017] Figure 6 This is a schematic diagram of the structure of the first fixing plate and the second fixing plate of this utility model.

[0018] In the diagram: 1. Frame; 11. Printhead assembly; 2. Mounting frame; 21. Rotary roller; 22. Placement tray; 23. Positioning plate; 24. Drive motor; 3. First fixing plate; 31. First rotating rod; 32. Clamping roller; 33. Second fixing plate; 34. Second rotating rod; 35. Mounting block; 36. Lead screw; 37. Rotary wheel; 38. Connecting block; 4. First long rod; 41. Second long rod; 42. Bevel gear; 43. Belt; 44. Support plate; 5. Support block; 51. Limiting ring. 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] Example: Figure 1-6As shown, this utility model provides a feeding mechanism for an FDM 3D printer, including a frame 1. A printhead assembly 11 is mounted on the frame 1. The printhead assembly 11 is specifically composed of a heater, a nozzle, and a driver. The heater is responsible for heating the plastic material to a molten state so that it can be extruded through the nozzle. The nozzle is the part of the printhead that directly extrudes the molten plastic. The driver controls the movement and extrusion action of the printhead. Common drivers include stepper motor drivers and servo motor drivers. An L-shaped mounting bracket 2 is fixedly mounted on the top of the frame 1. A rotating roller 21 is rotatably mounted above the vertical end of the mounting bracket 2. A placement tray 22 is sleeved on the rotating roller 21. A drive motor 24 is fixedly mounted on the top of the mounting bracket 2. The output end is coaxially fixed on the rotating roller 21. A first fixed plate 3 is fixedly provided on the lower surface of the top of the frame 1. A first rotating rod 31 is rotatably provided on the first fixed plate 3, and a clamping roller 32 is fixedly provided at one end of the first rotating rod 31 directly above the working surface. A second fixed plate 33 is movably provided at one end of the first fixed plate 3. A second rotating rod 34 is rotatably provided on the second fixed plate 33. The end of the second rotating rod 34 is fixedly provided with the same clamping roller 32 as the first rotating rod 31. The two clamping rollers 32 are arranged correspondingly. An L-shaped support block 5 is provided on the lower surface of the first fixed plate 3 near the end of the second fixed plate 33 and below the two clamping rollers 32. A limit ring 51 is fixedly provided at both the upper and lower ends of the support block 5. The limit ring 51 has a large diameter and does not need to be replaced.

[0021] A mounting block 35 is fixedly provided on the lower surface of the first fixing plate 3, and a lead screw 36 is threaded onto the mounting block 35. A connecting block 38 is fixedly provided on the lower surface of the second fixing plate 33, and the end of the lead screw 36 is rotatably mounted on the connecting block 38 through a bearing.

[0022] The end of the rotating roller 21 is threaded with a positioning plate 23. The positioning plate 23 is threadedly inserted into the rotating roller 21, which allows the placement plate 22 sleeved on the rotating roller 21 to be stably fixed to the rotating roller 21, facilitating subsequent rotation and wire feeding operations.

[0023] A first long rod 4 is provided on the side of the first fixed plate 3 and the second fixed plate 33 away from the clamping roller 32 and between the first rotating rod 31 and the second rotating rod 34. A second long rod 41 is movably inserted into the end of the first long rod 4. The surface of the second long rod 41 is provided with a protruding limiting strip. The ends of the first long rod 4 and the second long rod 41 are respectively connected to the first rotating rod 31 and the second rotating rod 34 through two meshing bevel gears 42. The end of the first long rod 4 away from the first rotating rod 31 is connected to the rotating roller 21 through a belt 43. The first long rod 4 and the second long rod 41 are provided to facilitate the simultaneous driving of the first rotating rod 31 and the second rotating rod 34 to rotate in opposite directions. At the same time, the second long rod 41 is inserted into the first long rod 4, so that the rotation between the first long rod 4 and the second long rod 41 will not be affected when the second fixed plate 33 is adjusted later. The belt 43 is provided to make the placement plate 22 and the clamping roller 32 rotate simultaneously. At the same time, in order to ensure transmission, the belt 43 adopts the toothed synchronous belt commonly used in the market to eliminate the lag in transmission.

[0024] A support plate 44 is fixedly provided on the side wall of the first fixed plate 3 near the first long rod 4 and the second long rod 41. The first long rod 4 and the second long rod 41 movably pass through the support plate 44. The support plate 44 is designed to support the first long rod 4 and the second long rod 41.

[0025] The end of the lead screw 36 away from the support block 5 is provided with a wheel 37 with a protruding anti-slip strip. The wheel 37 is mainly designed to facilitate the operator to rotate the lead screw 36 directly and quickly, making it easier for the operator to control it.

[0026] The limiting ring 51 is made of rubber. When the consumable is passed through the limiting ring 51, the bending surface of the consumable during subsequent swinging will contact the edge of the limiting ring 51. This can greatly protect the consumable and reduce the possibility of hard contact.

[0027] Working principle: During use, the consumables wound on the placement tray 22 first pass between the two clamping rollers 32, through the limiting ring 51 set on the support block 5, and then are inserted into the driver in the print head assembly 11. Subsequently, they are heated in the print head assembly 11 and ejected through the nozzle for printing. The drive motor 24 starts and drives the rotating roller 21 to rotate. At this time, the rotating roller 21 drives the placement tray 22 to rotate. At the same time, the belt 43 drives the first long rod 4 to rotate. The second long rod 41, which is inserted into the end of the first long rod 4 through the limiting strip, is driven to rotate together. At this time, the ends of the first long rod 4 and the second long rod 41 drive the first rotating rod 31 and the second rotating rod 34 to rotate in opposite directions through the bevel gear 42. The clamping rollers 32 at the ends of the second rotating rod 34 rotate in opposite directions, simultaneously pulling the consumable material clamped at the middle end downwards. While the placement tray 22 rotates to unwind, the clamping rollers 32 pull the consumable material to move, allowing it to gradually and stably enter the print head to complete the feeding operation. During this process, the clamping rollers 32, in conjunction with the limiting ring 51, can fully limit the unwinding end of the consumable material, ensuring it is on a stable line. The end of the consumable material near the placement tray 22 will not swing excessively. At the same time, the limiting ring 51 is made of rubber. When the consumable material near the print head swings, the curved surface of the consumable material contacts the edge of the limiting ring 51, which greatly protects the consumable material, reduces the possibility of hard contact, and lowers the risk of breakage.

[0028] When replacing consumables of different diameters, the operator can directly drive the rotating wheel 37 to rotate the lead screw 36. At this time, the lead screw 36, which is threaded on the mounting block 35, will be driven to move the connecting block 38 at the end. The connecting block 38 will then drive the second fixing plate 33, which is fixed at the end, to move. The movement of the second fixing plate 33 is controlled according to the diameter, thereby controlling the distance between the two clamping rollers 32 to better adapt to consumables of different diameters. The above operation can be quickly adjusted without special tools, which greatly improves the efficiency and convenience of operation and makes it easier for the operator to operate.

[0029] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art, and the circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A feeding mechanism for an FDM 3D printer, comprising a frame (1), characterized in that: A printhead assembly (11) is mounted on the frame (1). An L-shaped mounting bracket (2) is fixedly mounted on the top of the frame (1). A rotating roller (21) is rotatably mounted above the vertical end of the mounting bracket (2). A placement disc (22) is fitted on the rotating roller (21). A first fixing plate (3) is fixedly mounted on the lower surface of the top of the frame (1). A first rotating rod (31) is rotatably mounted on the first fixing plate (3), and a clamping roller (32) is fixedly mounted on one end of the first rotating rod (31) directly above the working surface. A second fixed plate (33) is movably provided at one end of the fixed plate (3). A second rotating rod (34) is rotatably provided on the second fixed plate (33). The end of the second rotating rod (34) is fixedly provided with the same clamping roller (32) as the first rotating rod (31). The two clamping rollers (32) are arranged correspondingly. A support block (5) in an L-shape is provided on the lower surface of the first fixed plate (3) near the end of the second fixed plate (33) and below the two clamping rollers (32). The upper and lower ends of the support block (5) are both fixedly provided with limiting rings (51). The first fixing plate (3) has a mounting block (35) fixedly mounted on its lower surface. A screw rod (36) is threaded onto the mounting block (35). The second fixing plate (33) has a connecting block (38) fixedly mounted on its lower surface. The end of the screw rod (36) is rotatably mounted on the connecting block (38) via a bearing.

2. The feeding mechanism of an FDM 3D printer as described in claim 1, characterized in that, The end of the roller (21) is threaded with a positioning plate (23).

3. The feeding mechanism of an FDM 3D printer as described in claim 2, characterized in that, The first fixed plate (3) and the second fixed plate (33) are located on the side away from the clamping roller (32) and between the first rotating rod (31) and the second rotating rod (34). A first long rod (4) is provided on the side away from the clamping roller (32) and between the first rotating rod (31) and the second rotating rod (34). A second long rod (41) is movably inserted at the end of the first long rod (4). A protruding limiting strip is provided on the surface of the second long rod (41). The ends of the first long rod (4) and the second long rod (41) are respectively connected to the first rotating rod (31) and the second rotating rod (34) through two meshing bevel gears (42). The end of the first long rod (4) away from the first rotating rod (31) is connected to the rotating roller (21) through a belt (43).

4. The feeding mechanism of an FDM 3D printer as described in claim 3, characterized in that, A support plate (44) is fixedly provided on the side wall of the first fixed plate (3) near the first long rod (4) and the second long rod (41), and the first long rod (4) and the second long rod (41) movably pass through the support plate (44).

5. The feeding mechanism of an FDM 3D printer as described in claim 4, characterized in that, The end of the lead screw (36) away from the support block (5) is provided with a wheel (37) with a protruding anti-slip strip.

6. The feeding mechanism of an FDM 3D printer as described in claim 5, characterized in that, A drive motor (24) is fixedly installed on the top of the mounting frame (2), and the output end of the drive motor (24) is coaxially fixed on the rotating roller (21).

7. The feeding mechanism of an FDM 3D printer as described in claim 6, characterized in that, The limiting ring (51) is made of rubber.

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