Z-axis transmission structure of small 3D printer

Abstract

The utility model discloses a Z-axis transmission structure of a small-sized 3D printer, which comprises a driving shell, a driving main body, a planet gear and a sun gear, an MR bearing is sleeved in a through hole formed in the driving main body, the MR bearing is sleeved on a low belt pulley, and the low belt pulley is sleeved on a shaft rod of a spider shaft. The output end is driven to rotate, the planet gear and the sun gear convert the rotating motion of the stepping motor into the output motion of the low-type belt pulley, then the hot bed supporting platform is driven through the synchronous belt installed on the low-type belt pulley, and the rotating motion of the stepping motor is converted into the vertical motion of the hot bed through the planet gear, the sun gear and the synchronous belt transmission mechanism. Precise positioning of the Z axis is achieved, and the problem that the transmission precision of the Z axis of the 3D printer is insufficient is solved; the hot bed is driven to move through the planet gear, the sun gear, the low belt pulley and the synchronous belt, and compared with screw transmission, a belt transmission system is easier to maintain and replace.

Description

Technical Field

[0001] The utility model relates to the technical field of Z-axis transmission, in particular to a Z-axis transmission structure of a small 3D printer. Background Art

[0002] 3D printer is a kind of cumulative manufacturing technology, also known as 3D printer. It is based on digital model files and manufactures 3D objects by printing adhesive materials layer by layer. 3D printing technology is widely used in many fields such as architecture, automobile manufacturing, aerospace, game toys, food processing, film and television props, art production, clothing, health care, maker education, etc. Its Z-axis drive is the key component to control the movement of the printing platform in the vertical direction (i.e., Z-axis). Its performance and accuracy directly affect the printing quality. The existing printer Z-axis transmission basically meets the demand, but there are still some shortcomings; the existing Z-axis movement is usually achieved by screw transmission or rack transmission, which causes greater wear on the components and easily leads to insufficient printer accuracy and reduced printing quality; the existing 3D printer Z-axis drive structure is complex and difficult to maintain in the later stage, so it is very necessary to design a Z-axis transmission structure for a small 3D printer. Utility Model Content

[0003] The utility model aims to provide a Z-axis transmission structure of a small 3D printer, so as to solve the defects of the existing 3D printer, that is, insufficient Z-axis transmission precision and difficulty in later maintenance.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a Z-axis transmission structure of a small 3D printer, comprising a driving housing, a driving body, a planetary gear and a sun gear, wherein an MR bearing is sleeved in a through hole opened in the driving body, the MR bearing is sleeved on a low-profile pulley, the low-profile pulley is sleeved on a shaft of a spider shaft, the shaft ends of the spider shaft are respectively sleeved with planetary gears, and a sun gear is meshed on the planetary gears.

[0005] As a further technical solution of the utility model, a brass nut, a shrink-fit insert, a first round head screw, a second round head screw and a third round head screw are embedded and installed in the through hole formed in the driving body.

[0006] As a further technical solution of the utility model, the driving body and the driving shell are fixedly connected to each other by a second round head screw, and the driving shell, gear shell, motor fixing plate and driving body are provided with through holes and are connected to each other by a third round head screw.

[0007] As a further technical solution of the utility model, an idler bearing is sleeved on the first round head screw, and the idler bearing is sleeved on the Z-axis idler.

[0008] As a further technical solution of the utility model, the Z-axis idler wheel is connected to the drive housing by a first round head screw, a transmission bearing is sleeved in the through hole of the drive housing, and the shaft of the spider shaft is sleeved on the transmission bearing.

[0009] As a further technical solution of the utility model, the planetary gear is meshed with a molded spur gear, the molded spur gear is fixedly connected to a gear housing, and the gear housing is fixedly connected to a bottom piece.

[0010] As a further technical solution of the utility model, a motor fixing plate is fixedly connected to one side of the bottom piece.

[0011] The utility model provides a Z-axis transmission structure of a small 3D printer, which has the advantages that when the stepper motor receives a control signal, the output end of the stepper motor is driven to rotate, the output end of the stepper motor drives the sun gear to rotate, the rotation of the sun gear drives the planetary gear to rotate, the rotation of the planetary gear drives the molded spur gear to rotate, the rotation of the molded spur gear drives the low-profile pulley to rotate, and then the hot bed support platform is driven by a synchronous belt installed on the low-profile pulley, the rotational motion of the stepper motor is converted into vertical movement of the hot bed through the planetary gear, sun gear and synchronous belt transmission mechanism, so as to realize precise positioning of the Z-axis and avoid the problem of insufficient transmission accuracy of the Z-axis of the 3D printer; the hot bed is driven to move by the planetary gear, sun gear, low-profile pulley and synchronous belt, so that the later maintenance is more convenient, and the synchronous belt transmission is easier to repair and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0014] Figure 2 It is an exploded view of the overall structure of the utility model;

[0015] Figure 3 for Figure 2 Schematic diagram of the structure of the middle A area;

[0016] Figure 4 It is a schematic diagram of the position of the second round head screw of the utility model.

[0017] In the figure: 1. drive housing; 3. MR bearing; 4. spider shaft; 5. low-profile pulley; 6. molded spur gear; 7. gear housing; 8. bottom piece; 9. motor fixing plate; 11. drive body; 12. brass nut; 13. shrink fit insert; 14. Z-axis idler; 15. first round head screw; 16. second round head screw; 17. third round head screw; 18. idler bearing; 19. planetary gear; 20. sun gear; 21. transmission bearing. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] See also Figure 1-4The utility model provides an embodiment: a Z-axis transmission structure of a small 3D printer, comprising a driving housing 1, a driving body 11, a planetary gear 19 and a sun gear 20, wherein an MR bearing 3 is sleeved in a through hole provided in the driving body 11, the MR bearing 3 is sleeved on a low-profile pulley 5, the low-profile pulley 5 is sleeved on the shaft of a spider shaft 4, the shaft ends of the spider shaft 4 are respectively sleeved with planetary gears 19, the planetary gear 19 is meshed with a sun gear 20, a brass nut 12, a shrink-fit insert 13, a first round head screw 15, a second round head screw 16 and a third round head screw 17 are embedded and installed in the through hole provided in the driving body 11, the driving body 11 and the driving housing 1 are fixedly connected to each other by the second round head screw 16, the driving housing 1, The gear housing 7, the motor fixing plate 9 and the driving body 11 are provided with through holes and are connected to each other through the third round head screw 17. The first round head screw 15 is sleeved with an idler bearing 18, and the idler bearing 18 is sleeved on the Z-axis idler 14. The Z-axis idler 14 is connected to the driving housing 1 through the first round head screw 15. A transmission bearing 21 is sleeved in the through hole provided in the driving housing 1, and the shaft of the spider shaft 4 is sleeved on the transmission bearing 21. The planetary gear 19 is meshed with the molded spur gear 6, and the molded spur gear 6 is fixedly connected to the gear housing 7. The gear housing 7 is fixedly connected to the bottom piece 8. One side of the bottom piece 8 is fixedly connected with the motor fixing plate 9. The motor fixing plate 9 is used to fix the stepping motor, and the stepping motor is used to provide power for the Z axis.

[0021] Specifically, when in use, first, when the stepper motor receives the control signal, it drives the output end to rotate, and the output end of the stepper motor drives the sun gear 20 to rotate, and the rotation of the sun gear 20 drives the planetary gear 19 to rotate, and the rotation of the planetary gear 19 drives the molded spur gear 6 to rotate, and the rotation of the molded spur gear 6 drives the low-profile pulley 5 to rotate, and then the hot bed support platform is driven by the synchronous belt installed on the low-profile pulley 5, and the rotational motion of the stepper motor is converted into vertical movement of the hot bed through the planetary gear 19, the sun gear 20 and the synchronous belt transmission mechanism, so as to realize the precise positioning of the Z-axis and avoid the problem of insufficient transmission accuracy of the Z-axis of the 3D printer; the hot bed is driven to move by the planetary gear 19, the sun gear 20, the low-profile pulley 5 and the synchronous belt, so that the later maintenance is more convenient, and the synchronous belt drive is easier to repair and replace.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A Z-axis transmission structure of a small 3D printer, comprising a drive housing (1), a drive body (11), a planetary gear (19) and a sun gear (20), characterized in that: An MR bearing (3) is sleeved in the through hole formed in the driving body (11), the MR bearing (3) is sleeved on a low-profile pulley (5), the low-profile pulley (5) is sleeved on the shaft of the spider shaft (4), the shaft ends of the spider shaft (4) are respectively sleeved with planetary gears (19), and the planetary gears (19) are meshed with a sun gear (20).

2. The Z-axis transmission structure of a small 3D printer according to claim 1, characterized in that: A brass nut (12), a shrink-fit insert (13), a first round-head screw (15), a second round-head screw (16) and a third round-head screw (17) are embedded and installed in the through hole formed in the driving body (11).

3. The Z-axis transmission structure of a small 3D printer according to claim 2, characterized in that: The driving body (11) and the driving housing (1) are fixedly connected to each other via a second round head screw (16); the driving housing (1), the gear housing (7), the motor fixing plate (9) and the driving body (11) are provided with through holes and are matched and connected to each other via a third round head screw (17).

4. The Z-axis transmission structure of a small 3D printer according to claim 2, characterized in that: An idler wheel bearing (18) is sleeved on the first round head screw (15), and the idler wheel bearing (18) is sleeved on the Z-axis idler wheel (14).

5. The Z-axis transmission structure of a small 3D printer according to claim 4, characterized in that: The Z-axis idler wheel (14) is connected to the drive housing (1) by means of a first round head screw (15); a transmission bearing (21) is sleeved in a through hole provided in the drive housing (1); and a shaft of the spider shaft (4) is sleeved on the transmission bearing (21).

6. The Z-axis transmission structure of a small 3D printer according to claim 1, characterized in that: The planetary gear (19) is meshed with a molded spur gear (6), the molded spur gear (6) is fixedly connected to a gear housing (7), and the gear housing (7) is fixedly connected to a bottom member (8).

7. The Z-axis transmission structure of a small 3D printer according to claim 6, characterized in that: A motor fixing plate (9) is fixedly connected to one side of the bottom member (8).

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