Feeding gearbox of 3D printing pen

Abstract

The utility model provides a feeding gear box of 3D printing pen, including the casing, be equipped with motor and gear set in drive connection in the casing, the gear set includes the reversing gear and multistage gear set that mesh connection, be equipped with motor chamber and gear chamber that are communicated with each other in the casing, the motor is fixed in the motor chamber in adaptation, and the gear chamber is equipped with the gear set. The gear cavity comprises a first gear cavity body and a second gear cavity body, a first shaft position used for being rotationally connected with the reversing gear is arranged in the first gear cavity body, the width of the first gear cavity body is matched with the rotating diameter of the reversing gear, and a plurality of second shaft positions used for being rotationally connected with the multi-stage gear set are arranged in the second gear cavity body. The multiple second shaft positions are distributed in two rows, and the shape of the second gear cavity is matched with the shape of two gears in each row in the multi-stage gear set.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing pens, in particular to a feeding gear box of a 3D printing pen. Background Art

[0002] 3D printing pens use a built-in motor gearbox to propel the material. Chinese patent CN208417466U discloses a novel gearbox that utilizes crown gears in conjunction with motor gears. The crown gears redirect the horizontally positioned motor gears to a vertical direction, allowing the motor to lie flat and reducing the overall size of the gearbox, which consists of a gearbox cover and base. However, the gear train length remains very long when the multi-stage gears in the gearbox are engaged, preventing further reduction in the overall length of the gearbox. Furthermore, the spatial arrangement of the gearbox is not rational, resulting in wasted installation space and making it difficult to further reduce the size of the gearbox, making it unsuitable for smaller 3D printing pens. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a feeding gear box for a 3D printing pen.

[0004] In order to achieve the aforementioned objectives, the utility model provides a feeding gear box for a 3D printing pen, comprising a shell, in which a drive-connected motor and a gear set are installed, the gear set comprising a meshing-connected reversing gear and a multi-stage gear set, a motor cavity and a gear cavity being provided in the shell, the motor being adapted and fixed in the motor cavity, the gear cavity comprising a first gear cavity and a second gear cavity, a first axial position for rotatably connecting the reversing gear being provided in the first gear cavity, the width of the first gear cavity being adapted to the rotation diameter of the reversing gear, a plurality of second axial positions for rotatably connecting the multi-stage gear set being provided in the second gear cavity, the plurality of second axial positions being distributed in two rows, and the shape of the second gear cavity being adapted to the shape of the two gears in each row of the multi-stage gear set.

[0005] As a preferred solution, the maximum width of the second gear cavity is equal to or slightly larger than the width of the motor cavity.

[0006] As a preferred solution, a feed cavity is provided on the shell, both ends of the feed cavity are connected, and driven wheels and part of the multi-stage gear set are rotatably provided on opposite sides of the feed cavity.

[0007] As a preferred solution, the gear set further includes a driving gear fixed on the rotating shaft of the motor, wherein the driving gear is accommodated in the first gear cavity and meshes with the reversing gear.

[0008] As a preferred solution, the reversing gear includes a coaxially fixed crown gear and a spur gear, the crown gear is engaged with the driving gear, and the spur gear is engaged with the multi-stage gear set.

[0009] As a preferred solution, the multi-stage gear set includes a first gear, a second gear, a third gear and a fourth gear that are meshed in sequence. The first gear, the second gear, the third gear and the fourth gear are all double gears. The first gear is meshed with the spur gear of the reversing gear. The pushing tooth of the fourth gear is rotatably set in the feed chamber, and the external paint tube is movably clamped between the pushing tooth and the driven wheel.

[0010] As a preferred solution, the transmission ratio of the driving gear and the reversing gear, the transmission ratio of the first gear and the second gear, and the transmission ratio of the second gear and the third gear are all 25:8, the transmission ratio of the reversing gear and the first gear is 26:8, and the transmission ratio of the third gear and the fourth gear is 23:10.

[0011] As a preferred embodiment, the shell includes a first shell, a second shell and a third shell, the first shell and the second shell are detachably connected and the motor cavity and the gear cavity are provided between the two, and the second shell and the third shell are detachably connected and the feed cavity is provided between the two.

[0012] As a preferred embodiment, the inner wall of the first gear cavity is provided with a fixing column and a fixing hole fixed by fasteners, and the fixing column and the fixing hole are respectively arranged between the first shell and the second shell; the outer walls of the motor cavity and the second gear cavity are provided with a snap-connected snap block and a fixing block, and the snap block and the fixing block are respectively arranged between the first shell and the second shell.

[0013] As a preferred solution, the second shell is provided with a heat dissipation hole at a position corresponding to the motor cavity.

[0014] Therefore, according to the technical means of the present invention, the effects that can be obtained by the present invention are briefly described as follows: the feeding gearbox of the 3D printing pen provided by the present invention sets the inner cavity of the shell as a motor cavity and a gear cavity that are connected. The shape of the motor cavity is adapted to the motor for fixing the motor. The gear cavity includes a first gear cavity and a second gear cavity. The width of the first gear cavity is adapted to the rotation diameter of the reversing gear for rotatably installing the reversing gear. The shape of the second gear cavity is adapted to the shape of the two gears in each row of the multi-stage gear set for rotatably installing the multi-stage gear set distributed in multiple rows and two columns. It can be seen that the feeding gearbox provided by the present invention distributes the multiple gears of the multi-stage gear set in multiple rows and two columns, and also limits the shape and width of the motor cavity and gear cavity in the shell, so that the inner cavity of the shell is closer to the shape of the motor and gear set, which can reduce space waste and enhance the rationality of space setting. It can further reduce the length of the shell shape, so that the feeding gearbox can be suitable for a smaller 3D printing pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the feed gearbox.

[0017] Figure 3 for Figure 1 Schematic diagram of the internal structure of the feed gearbox.

[0018] Figure 4 for Figure 2 Schematic diagram of the structure of the motor and gear set.

[0019] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure of the feed gearbox.

[0020] In the figure: 1: housing; 10: motor cavity; 20: gear cavity; 21: first gear cavity; 211: first axial position; 22: second gear cavity; 221: second axial position; 30: feeding cavity; 301: third axial position; 302: through hole; 11: first housing; 111: fixing column; 112: snap block; 12: second housing; 121: fixing hole; 122: snap block; 123: heat dissipation hole; 13: third housing; 2: motor; 3: gear set; 31: driving gear; 32: reversing gear; 33: multi-stage gear set; 331: first gear; 332: second gear; 333: third gear; 334: fourth gear; 3341: pushing tooth; 4: driven wheel. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It will be understood that the drawings are only provided for reference and illustration purposes and are not intended to limit the present invention. The connections shown in the drawings are only for the convenience of clear description and do not limit the connection method.

[0022] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like are based on the directions or positional relationships shown in the accompanying drawings to describe the present invention, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating that the devices or elements referred to must have a special direction or positional relationship, and therefore cannot be understood as limiting the present invention. It should be noted that when one piece is considered to be "connected" to another piece, it may be directly connected to the other piece or there may be a central piece at the same time. It should be understood that the terms "first", "second" and the like are only for the convenience of describing the technical solution of the present invention, rather than indicating that the devices or elements referred to must have a special order, and therefore cannot be understood as limiting the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

[0023] like Figure 1-Figure 5 As shown, this embodiment provides a feeding gearbox for a 3D printing pen, including a shell 1, in which a drive-connected motor 2 and a gear set 3 are installed. The shell 1 is also equipped with a driven wheel 4 for cooperating with the gear set 3 to move and clamp an external paint tube.

[0024] Among them, the shell 1 includes a first shell 11, a second shell 12 and a third shell 13. The first shell 11 and the second shell 12 are detachably connected and a motor cavity 10 and a gear cavity 20 are provided between the two. The second shell 12 and the third shell 13 are detachably connected and a feed cavity 30 is provided between the two.

[0025] It can be understood that the motor cavity 10 is connected to the gear cavity 20. The shape of the motor cavity 10 is the same as that of the motor 2, and is used to adapt and fix the motor 2 so that the inner cavity shape of the housing 1 can be closer to the shape of the motor 2. The gear cavity 20 includes a first gear cavity 21 and a second gear cavity 22. The first gear cavity 21 is provided with a first axial position 211 for rotating and connecting the reversing gear in the gear set 3, and the width of the first gear cavity 21 is adapted to the rotation diameter of the reversing gear. The second gear cavity 22 is provided with a plurality of second axial positions 221 for rotating and connecting the multi-stage gear set in the gear set 3. The plurality of second axial positions 221 are distributed in two columns, and the line connecting the two second axial positions 221 in the same row is a slant line or a straight line, and the shape of the second gear cavity 22 is adapted to the shape of the two gears in each row of the multi-stage gear set.

[0026] The aforementioned arrangement of gear cavity 20 serves to restrict the positional distribution of the multiple gears in gear set 3, arranging the majority of the gears in gear set 3 in multiple rows and two columns. This reduces the length of gear set 3 without compromising transmission performance, further shortening the overall length of housing 1. Furthermore, the width and shape restrictions of first gear cavity 21 and second gear cavity 22 allow the internal shape of housing 1 to more closely align with the shape of gear set 3, thereby reducing space waste and enhancing the rationality of spatial layout.

[0027] In this embodiment, the maximum width of the second gear cavity 22 is equal to (or slightly greater than) the width of the motor cavity 10. This serves to constrain the outer shape of the housing 1 and balance the width distribution of the various cavities within the housing 1, allowing the housing 1 to assume a rectangular parallelepiped shape, making it suitable for smaller, conventionally shaped 3D printing pens. In other embodiments, the width of the second gear cavity 22 can be set to be smaller or even greater than the width of the motor cavity 10, thereby changing the outer shape of the housing 1 to accommodate 3D printing pens with unusual shapes.

[0028] As can be understood, both ends of the feed chamber 30 are connected, allowing an external pigment tube to enter the feed chamber 30 through one end and extend out of the feed chamber 30 from the other end. A third axis position 301 and a through hole 302 are respectively provided on opposite sides of the feed chamber 30. The third axis position 301 is used to rotatably connect to the driven wheel 4, and the through hole 302 is connected to the second gear chamber 22, allowing the gear set 3 to extend into and rotate within the feed chamber 30, thereby enabling the gear set 3 to cooperate with the driven wheel 4 to rotate and propel the external pigment tube.

[0029] In this embodiment, the first housing 11 and the second housing 12 are detachably connected by means of a combination of fasteners and a snap-fit ​​structure. Specifically, the inner wall of the first gear cavity 21 is provided with a fixing column 111 and a fixing hole 121 fixed by fasteners (such as bolts, rivets, etc.). The fixing column 111 and the fixing hole 121 are respectively arranged between the first housing 11 and the second housing 12. The outer walls of the motor cavity 10 and the second gear cavity 22 are provided with a snap-fitting snap-fit ​​block 112 and a fixing block 122. The snap-fitting block 112 and the fixing block 122 are respectively arranged between the first housing 11 and the second housing 12. In other embodiments, the first housing 11 and the second housing 12 may be detachably connected by other means or multiple structures, such as a combination of a plug-in structure and a snap-fit ​​structure.

[0030] It can be understood that the positioning of the fixing columns 111 on the two side edges of the first gear cavity 21 can reduce the interference of the fixing columns 111 with the gear set 3 while also utilizing the remaining space in the first gear cavity 21. Therefore, the provision of the fixing columns 111 does not increase the width of the first gear cavity 21, but also reduces space waste and enhances the rationality of the spatial arrangement. The clip blocks 112 and the fixing blocks 122 are relatively thin, and both are positioned on the outer wall of the housing 1, thus similarly not increasing the width of the housing 1 or affecting its overall shape.

[0031] In this embodiment, the second housing 12 has heat dissipation holes 123 at positions corresponding to the motor cavity 10 to improve the heat dissipation efficiency of the motor 2. In other embodiments, the second housing 12 may not have heat dissipation holes 123.

[0032] The gear set 3 includes a driving gear 31, a reversing gear 32 and a multi-stage gear set 33 that are meshed together, wherein the driving gear 31 is fixed on the rotating shaft of the motor 2, the reversing gear 32 is meshed and connected to the driving gear 31 and the multi-stage gear set 33, and a part of the multi-stage gear set 33 is rotatably arranged in the feed chamber 30 through the through hole 302.

[0033] The drive gear 31 and the reversing gear 32 are both rotatably mounted within the first gear cavity 21. The drive gear 31 is rotatably received between the two fixing posts 111, while the reversing gear 32 is rotatably connected to the first shaft 211. It will be appreciated that the reversing gear 32 includes a coaxially fixed crown gear and a spur gear. The crown gear meshes with the drive gear 31, and the spur gear meshes with the multi-stage gear set 33.

[0034] In this embodiment, the multi-stage gear set 33 includes a first gear 331, a second gear 332, a third gear 333, and a fourth gear 334, which mesh in sequence. The first gear 331, the second gear 332, the third gear 333, and the fourth gear 334 are all double gears. It will be appreciated that the number of gears in the multi-stage gear set 33 is the same as the number of the second shaft 221, and each gear of the multi-stage gear set 33 is rotationally connected to the second shaft 221 in a one-to-one correspondence. The first gear 331 meshes with the spur gear of the reversing gear 32. The driving teeth 3341 of the fourth gear 334 are rotatably disposed within the feed chamber 30 through the through hole 302. The driving teeth 3341 movably clamp the external paint tube between the driven wheel 4. In other embodiments, the number of gears in the multi-stage gear set 33 can be adjusted to three, six, or more.

[0035] To ensure that the external paint tube, driven by the multi-stage gear set 33, can move stably and slowly, in this embodiment, the transmission ratios of the drive gear 31 and the reversing gear 32, the first gear 331 and the second gear 332, and the second gear 332 and the third gear 333 are all set to 25:8. The transmission ratio of the reversing gear 32 and the first gear 331 is set to 26:8, and the transmission ratio of the third gear 333 and the fourth gear 334 is set to 23:10. This ensures that the overall transmission ratio of the gear set 3 is sufficiently large to achieve a reduction in speed. In other embodiments, the transmission ratios of the meshing gear pairs in the gear set 3 can be set to other values ​​depending on the speed of the motor 2.

[0036] For clarity, certain features of the present invention described in the context of separate embodiments may be combined in a single embodiment. Furthermore, various features of the present invention described in the context of a single embodiment may also be used individually or in any suitable subcombination.

Claims

1. A feeding gearbox for a 3D printing pen, comprising a housing, wherein a motor and a gear set connected to each other for driving are installed in the housing, wherein the gear set comprises a reversing gear and a multi-stage gear set in meshing connection, characterized in that: The housing is provided with a motor cavity and a gear cavity which are connected to each other. The motor is adapted to be fixed in the motor cavity. The gear cavity includes a first gear cavity and a second gear cavity. The first gear cavity is provided with a first axial position for rotatably connecting the reversing gear. The width of the first gear cavity is adapted to the rotation diameter of the reversing gear. The second gear cavity is provided with multiple second axial positions for rotatably connecting the multi-stage gear set. The multiple second axial positions are distributed in two rows. The shape of the second gear cavity is adapted to the shape of the two gears in each row of the multi-stage gear set.

2. The feeding gear box of the 3D printing pen according to claim 1, characterized in that: The maximum width of the second gear cavity is equal to or slightly larger than the width of the motor cavity.

3. The feeding gear box of the 3D printing pen according to any one of claims 1 or 2, characterized in that: A feed cavity is provided on the shell, and both ends of the feed cavity are connected. Driven wheels and part of the multi-stage gear set are rotatably provided on two opposite sides of the feed cavity.

4. The feeding gear box of the 3D printing pen according to claim 3, characterized in that: The gear set further includes a driving gear fixed on the rotating shaft of the motor. The driving gear is accommodated in the first gear cavity and meshes with the reversing gear.

5. The feeding gear box of the 3D printing pen according to claim 4, characterized in that: The reversing gear includes a coaxially fixed crown gear and a spur gear, the crown gear is engaged with the driving gear, and the spur gear is engaged with the multi-stage gear set.

6. The feeding gear box of the 3D printing pen according to claim 5, characterized in that: The multi-stage gear set includes a first gear, a second gear, a third gear and a fourth gear that are meshed in sequence. The first gear, the second gear, the third gear and the fourth gear are all double gears. The first gear is meshed with the spur gear of the reversing gear. The pushing tooth of the fourth gear is rotatably set in the feed chamber, and the external paint tube is movably clamped between the pushing tooth and the driven wheel.

7. The feeding gear box of the 3D printing pen according to claim 6, characterized in that: The transmission ratio of the driving gear to the reversing gear, the transmission ratio of the first gear to the second gear, and the transmission ratio of the second gear to the third gear are all 25:8, the transmission ratio of the reversing gear to the first gear is 26:8, and the transmission ratio of the third gear to the fourth gear is 23:

10.

8. The feeding gear box of the 3D printing pen according to claim 3, characterized in that: The shell includes a first shell, a second shell and a third shell. The first shell and the second shell are detachably connected and the motor cavity and the gear cavity are arranged between them. The second shell and the third shell are detachably connected and the feed cavity is arranged between them.

9. The feeding gear box of the 3D printing pen according to claim 8, characterized in that: The inner wall of the first gear cavity is provided with a fixing column and a fixing hole fixed by fasteners, and the fixing column and the fixing hole are respectively arranged between the first shell and the second shell; the outer walls of the motor cavity and the second gear cavity are provided with a snap-connected snap block and a fixing block, and the snap block and the fixing block are respectively arranged between the first shell and the second shell.

10. The feeding gear box of the 3D printing pen according to claim 8, characterized in that: The second shell is provided with a heat dissipation hole at a position corresponding to the motor cavity.

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