A material conveying mechanism and a 3D printer

Abstract

The utility model relates to 3D printer technical field, concretely is a kind of material conveying mechanism and 3D printer;The mechanism includes mounting bracket and top arm mechanism;Fixed shaft is set through on mounting bracket, rotatingly connected with rotating arm on fixed shaft, and the handle with the recessed structure of rotating arm is provided;Top arm mechanism includes the fixed cylinder being set on mounting bracket, the spring being set in fixed cylinder, the telescopic link being set on spring and slidingly connected on fixed cylinder, the top ball being set on the end of telescopic link away from spring, the limiting slider being distributed in annular array on telescopic link, the fixed disc being set on fixed cylinder, and the first bolt of multiple annular array distribution and set through fixed disc.The utility model passes through the expansion of the gap between manual control pressure wheel and driving wheel, material is passed through gap to realize feeding, cooperate and increase the operation convenience of improved lever structure to improve feeding, while ensuring the stability of material conveying.

Description

Technical Field

[0001] This utility model relates to the field of 3D printer technology, and in particular to a material feeding mechanism and a 3D printer. Background Technology

[0002] A 3D printer is essentially a digital manufacturing tool. It creates a three-dimensional digital model using 3D modeling software on a computer, then uses specialized software to divide the three-dimensional model into thousands of extremely thin two-dimensional cross-sections and generate instruction codes that the printer can execute. Based on the slice information, the printer adds a thin layer of material using specific techniques, ultimately building a complete three-dimensional physical model from bottom to top.

[0003] Chinese Patent No. CN218196997U discloses a feeding mechanism for a 3D printer that prevents material breakage. The mechanism includes a base and a drive wheel and a pressure wheel mounted on the base. It also includes: a feed pipe located on one side of the base, below the drive wheel and pressure wheel; a discharge pipe on the same side as the feed pipe, above the drive wheel and pressure wheel; an exposed groove located on the outer surface of the feed pipe; a limit switch located on the base, which controls the 3D printer's operation by detecting the material conveying status through the exposed groove; and a controller that controls the 3D printer's operation based on the material information detected by the limit switch, and is electrically connected to the limit switch.

[0004] However, the above technical solution has the following shortcomings: When the 3D printer passes the material between the drive wheel and the pressure wheel, the material applies a squeezing force to the drive wheel and the pressure wheel, causing the pressure wheel to drive the moving seat to the right. The elastic element is compressed and passes the material through. However, the material itself has low hardness and does not have the ability to push the pressure wheel. Even if the spring can be compressed by manually pushing the limit block, this method of applying force is not labor-saving in terms of the structure of the moving seat. In addition, the spring itself has a relatively large stiffness coefficient in order to ensure that the squeezing force of the pressure wheel is large enough, which requires more force to squeeze, affecting the convenience of use. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a feeding mechanism and a 3D printer. By manually controlling the widening of the gap between the pressure roller and the drive roller, the material is fed through the gap. The improved lever structure further enhances the ease of feeding while ensuring the stability of the feeding process.

[0006] On one hand, this utility model proposes a material conveying mechanism, including a mounting frame and a top arm mechanism; a fixed shaft is provided through the mounting frame, and a rotating arm is rotatably connected to the fixed shaft, with a handle having an inwardly recessed structure on the rotating arm; the top arm mechanism includes a fixed cylinder provided on the mounting frame, a spring provided inside the fixed cylinder, a telescopic rod with one end provided on the spring and slidably connected to the fixed cylinder, a top ball provided at the end of the telescopic rod away from the spring, four limiting sliders distributed in a ring array on the telescopic rod, a fixed disk provided on the fixed cylinder, and multiple first bolts distributed in a ring array and penetrating the fixed disk; the top ball and the rotating arm abut against each other, the inside of the fixed cylinder is provided with a groove for the limiting slider to slide vertically, and the first bolts are threadedly connected to the mounting frame.

[0007] Preferably, the rotating arm is provided with a feed hole, and the mounting frame is provided with a discharge pipe.

[0008] Preferably, a top plate is provided on the rotating arm, and the top ball and the top plate are slidably connected.

[0009] Preferably, the rotating arm is provided with a mounting shaft, a pressure roller is sleeved on the mounting shaft, a closing block is fitted on the rotating arm, a screw passes through and abuts against the closing block, and the screw is threadedly connected to the mounting shaft.

[0010] Preferably, a motor is provided on the side of the mounting bracket, the motor is driven by a drive wheel, a fixed shaft is provided on the motor, a first retaining ring is provided on the fixed shaft, the first retaining ring and the mounting bracket are in contact with each other, and a threaded cap is threadedly connected to one end of the fixed shaft, the threaded cap and the rotating arm abut against each other.

[0011] Preferably, the motor is provided with two guide cylinders, and the guide cylinders are provided with second retaining rings. The second retaining rings and the mounting bracket fit together. The mounting bracket is provided with two second bolts, which are threaded onto the motor.

[0012] On the other hand, this utility model proposes a 3D printer, including a body and the above-mentioned material feeding mechanism; the body is provided with two vertical moving frames, the vertical moving frames are provided with vertically moving connecting blocks, the connecting blocks are provided with horizontal moving frames, and the horizontal moving frames are provided with horizontally moving mounting seats.

[0013] Preferably, a longitudinal moving frame is provided on the machine body, and a printing base plate is provided on the longitudinal moving frame.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This utility model, through the design of a rotating arm and a top arm mechanism, can more easily widen the gap between the pressure roller and the drive roller during material feeding by forming a lever structure, so as to realize the feeding operation. At the same time, the selection of springs and the lever structure ensure that the vibration force during printing will not cause the rotating arm to deflect, thus ensuring the printing quality. Moreover, it is simple and convenient to operate and has good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a split schematic diagram of the material conveying mechanism of this utility model; Figure 3 This is a schematic diagram of the rotating arm of this utility model; Figure 4 This is a cross-sectional schematic diagram of the top arm mechanism of this utility model; Figure 5 This is a schematic diagram of the structure of the body of this utility model.

[0016] Reference numerals: 1. Mounting bracket; 2. Fixed shaft; 3. Rotating arm; 4. Mounting shaft; 5. Pressure roller; 6. Motor; 7. Drive wheel; 8. Handle; 9. Fixed cylinder; 10. Spring; 11. Telescopic rod; 12. Top ball; 13. Limiting slider; 14. Fixed plate; 15. First bolt; 16. Closing block; 17. Screw; 18. Threaded cap; 19. First retaining ring; 20. Guide cylinder; 21. Second retaining ring; 22. Second bolt; 23. Top plate; 24. Feed hole; 25. Discharge pipe; 26. Machine body; 27. Vertical moving frame; 28. Connecting block; 29. ​​Horizontal moving frame; 30. Mounting base; 31. Longitudinal moving frame; 32. Printing base plate. Detailed Implementation

[0017] Example 1 like Figure 1 - Figure 4 As shown, the material conveying mechanism proposed in this embodiment includes a mounting frame 1 and a top arm mechanism; a fixed shaft 2 is disposed through the mounting frame 1, and a rotating arm 3 is rotatably connected to the fixed shaft 2; the rotating arm 3 has a handle 8 with a concave structure; a feed hole 24 is provided on the rotating arm 3; and a discharge pipe 25 is provided on the mounting frame 1. The top arm mechanism includes a fixed cylinder 9 mounted on the mounting frame 1, a spring 10 inside the fixed cylinder 9, a telescopic rod 11 with one end mounted on the spring 10 and slidably connected to the fixed cylinder 9, a top ball 12 mounted on the end of the telescopic rod 11 away from the spring 10, four limit sliders 13 arranged in a ring array on the telescopic rod 11, a fixed plate 14 mounted on the fixed cylinder 9, and multiple first bolts 15 arranged in a ring array and penetrating the fixed plate 14; the top ball 12 and the rotating arm 3 abut against each other, the interior of the fixed cylinder 9 is provided with a groove for the limit sliders 13 to slide vertically, the first bolts 15 are threadedly connected to the mounting frame 1, the rotating arm 3 is provided with a top plate 23, and the top ball 12 and the top plate 23 are slidably connected.

[0018] In this embodiment, when it is necessary to widen the gap between the pressure roller 5 and the drive roller 7 to allow material to pass through the gap, the handle 8 on the rotating arm 3 is pressed. The handle 8 rotates slightly around the center line of the fixed shaft 2. The spring 10 has a large stiffness coefficient to ensure that it will not easily deform elastically when subjected to vibration, thus ensuring the stability of the pressure roller 5. When the rotating arm 3 rotates, the top plate 23 is always in contact with the top ball 12, and the contact is subject to the elastic force of the spring 10 through the telescopic rod 11. This requires a certain amount of force to press. However, to avoid excessive elastic force affecting the ease of use, The force application point of the top ball 12 is located in the middle of the rotating arm 3, thus forming a force-saving lever structure. When the vibration force acts in the opposite direction on the rotating arm 3, it forms a force-consuming lever that is not easy to rotate. The limit slider 13 and the groove play a guiding and stabilizing role in the movement of the telescopic rod 11, preventing the telescopic rod 11 from deflecting. It also prevents the spring 10 from bending or twisting, ensuring the service life of the spring 10 and having good practicality. When it is necessary to install or disassemble the top arm mechanism, it can be installed or disassembled through the first bolt 15 and the fixing plate 14 to remove and replace the fixing cylinder 9 from the mounting frame 1. The operation is simple.

[0019] Example 2 like Figure 1 - Figure 3 As shown, in this embodiment, a material conveying mechanism is proposed. Compared with the first embodiment, in this embodiment, a motor 6 is provided on the side of the mounting frame 1. The motor 6 drives and connects to the drive wheel 7. The fixed shaft 2 is provided on the motor 6. A first retaining ring 19 is provided on the fixed shaft 2. The first retaining ring 19 and the mounting frame 1 are in close contact with each other. A threaded cap 18 is threadedly connected to one end of the fixed shaft 2. The threaded cap 18 and the rotating arm 3 abut against each other.

[0020] A mounting shaft 4 is provided on the rotating arm 3, a pressure roller 5 is sleeved on the mounting shaft 4, a closing block 16 is fitted on the rotating arm 3, a screw 17 passes through and abuts on the closing block 16, and the screw 17 is threadedly connected to the mounting shaft 4.

[0021] The motor 6 is provided with two guide cylinders 20, and a second retaining ring 21 is provided on the guide cylinder 20. The second retaining ring 21 and the mounting bracket 1 are in close contact with each other. Two second bolts 22 are provided through the mounting bracket 1, and the second bolts 22 are threadedly connected to the motor 6.

[0022] In this embodiment, the motor 6 is used to drive and control the rotation of the drive wheel 7. The stable material conveying is ensured by the tooth structure on the drive wheel 7 and the squeezing action of the pressure wheel 5. When assembling the material conveying mechanism, the mounting bracket 1 is first passed through the fixed shaft 2, and then the second bolt 22 is passed through the mounting bracket 1 and screwed into the housing of the motor 6. At this time, the back of the mounting bracket 1 abuts against the first retaining ring 19 and the second retaining ring 21. Then, the pressure wheel 5 is sleeved on the mounting shaft 4 and then closed by the screw 17 and the closing block 16. At this time, the pressure wheel 5 and the drive wheel 7 are installed in the correct positions. Finally, the threaded cap 18 is screwed onto the fixed shaft 2. The operation is simple.

[0023] Example 3 like Figure 5 As shown, the 3D printer proposed in this embodiment includes a body 26 and the feeding mechanism in the above embodiment. The body 26 is provided with two vertical moving frames 27, and the vertical moving frames 27 are provided with vertically moving connecting blocks 28. The connecting blocks 28 are provided with horizontal moving frames 29, and the horizontal moving frames 29 are provided with horizontally moving mounting seats 30. The body 26 is provided with a longitudinal moving frame 31, and the longitudinal moving frame 31 is provided with a printing base plate 32.

[0024] In this embodiment, the printer head (not shown) and the material feeding mechanism are both fixedly mounted on the mounting base 30. The printer head sprays material onto the printing base plate 32 for modeling. At the same time, the horizontal position and vertical height of the printer head are controlled by the vertical moving frame 27 and the horizontal moving frame 29, and the vertical position of the printing base plate 32 is controlled by the longitudinal moving frame 31, thereby realizing the function of three-dimensional printing. The vertical moving frame 27, the horizontal moving frame 29 and the longitudinal moving frame 31 adopt digital modeling and electromechanical collaborative control technology to achieve accurate conversion from virtual model to physical model. This technology is a mature existing technology and will not be described in detail.

[0025] It should be noted that a protective cover is also provided on the outside of the machine body 26 to protect the 3D printing equipment.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A material conveying mechanism, characterized in that, include: Mounting bracket (1), through which a fixed shaft (2) is provided, and a rotating arm (3) is rotatably connected to the fixed shaft (2), and the rotating arm (3) has a handle (8) with a concave structure. The top arm mechanism includes a fixed cylinder (9) mounted on the mounting frame (1), a spring (10) inside the fixed cylinder (9), a telescopic rod (11) with one end mounted on the spring (10) and slidably connected to the fixed cylinder (9), a top ball (12) mounted on the end of the telescopic rod (11) away from the spring (10), four limit sliders (13) arranged in a ring array on the telescopic rod (11), a fixed plate (14) mounted on the fixed cylinder (9), and a first bolt (15) arranged in a ring array and penetrating the fixed plate (14); the top ball (12) and the rotating arm (3) abut against each other, the inside of the fixed cylinder (9) is provided with a groove for the limit slider (13) to slide vertically, and the first bolt (15) is threadedly connected to the mounting frame (1).

2. The material conveying mechanism according to claim 1, characterized in that, The rotating arm (3) is provided with a feed hole (24), and the mounting frame (1) is provided with a discharge pipe (25).

3. The material conveying mechanism according to claim 1, characterized in that, A top plate (23) is provided on the rotating arm (3), and the top ball (12) and the top plate (23) are slidably connected.

4. A material conveying mechanism according to claim 1, characterized in that, A mounting shaft (4) is provided on the rotating arm (3), a pressure roller (5) is sleeved on the mounting shaft (4), a closing block (16) is fitted on the rotating arm (3), a screw (17) passes through and abuts on the closing block (16), and the screw (17) and the mounting shaft (4) are threaded together.

5. A material conveying mechanism according to claim 1, characterized in that, A motor (6) is provided on the side of the mounting bracket (1). The motor (6) is connected to a drive wheel (7). A fixed shaft (2) is provided on the motor (6). A first retaining ring (19) is provided on the fixed shaft (2). The first retaining ring (19) and the mounting bracket (1) fit together. A threaded cap (18) is threaded to one end of the fixed shaft (2). The threaded cap (18) and the rotating arm (3) abut against each other.

6. A material conveying mechanism according to claim 5, characterized in that, Two guide cylinders (20) are provided on the motor (6), and a second retaining ring (21) is provided on the guide cylinder (20). The second retaining ring (21) and the mounting bracket (1) are in close contact with each other. Two second bolts (22) are provided through the mounting bracket (1), and the second bolts (22) are threadedly connected to the motor (6).

7. A 3D printer, characterized in that, The material conveying mechanism according to any one of claims 1-6 further includes a body (26), on which two vertical moving frames (27) are provided, on which a vertically moving connecting block (28) is provided, on which a horizontal moving frame (29) is provided, and on which a horizontally moving mounting seat (30) is provided.

8. A 3D printer according to claim 7, characterized in that, The machine body (26) is provided with a longitudinal moving frame (31), and the longitudinal moving frame (31) is provided with a printing base plate (32).

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