CN218576998U

CN218576998U - Undulant buffering subassembly, lead screw drive mechanism and 3D printer

Info

Publication number: CN218576998U
Application number: CN202221960706.9U
Authority: CN
Inventors: 刘辉林; 黎雷; 王子建
Original assignee: Shenzhen Chuangxiang 3D Technology Co Ltd
Current assignee: Shenzhen Chuangxiang 3D Technology Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-03-07
Anticipated expiration: 2032-07-26

Abstract

The utility model discloses an undulant buffering subassembly, locate including screw-nut, first undulant piece and clamp screw-nut with a plurality of first balls between the first undulant piece. The surface of the first fluctuation piece opposite to the screw nut is provided with first rolling grooves corresponding to the first balls one to one, and the screw nut is fixedly connected with the first fluctuation piece so that the first balls can roll in the first rolling grooves and are limited in the first rolling grooves. When the screw nut fluctuates in the moving process, the first ball can roll along with the screw nut, and the rolling of the ball eliminates the influence caused by the fluctuation when the screw nut is directly connected with the moving device in a hard mode, so that the forming quality of a printing model is improved. The utility model discloses still disclose an adoption the lead screw drive mechanism and the 3D printer of undulant buffering subassembly.

Description

Undulant buffering subassembly, lead screw drive mechanism and 3D printer

Technical Field

The utility model relates to a 3D prints technical field, especially relates to an undulant buffering subassembly, screw drive mechanism and adopts screw drive mechanism's 3D printer.

Background

The field of 3D printing technology application is wider and wider under the promotion of intellectualization of computer digital technology, and the 3D printing technology is favored by DIY enthusiasts. In the related art, a lead screw transmission mechanism is adopted for Z-axis transmission of a 3D printer. The lead screw transmission mechanism comprises a lead screw driven by a motor to rotate, and a nut component in threaded connection with the lead screw, wherein related functional components are fixed on the nut component, such as functional components of Fused Deposition Modeling (FDM) 3D printers and photocuring 3D printers, which are generally corresponding printing platforms. Because the requirement on the machining precision is higher, the lead screw needs to be detected for many times during installation, and time and labor are wasted. If the precision is in problem during installation, the functional components connected with the screw rod, such as the printing platform, can fluctuate when the screw rod rotates, and therefore the forming quality of the printing model is affected.

Disclosure of Invention

The utility model provides a reducible undulant and then promote undulant buffering subassembly lead screw drive mechanism and the adoption of the shaping quality of printing the model lead screw drive mechanism's 3D printer.

In a first aspect, an embodiment of the present application provides a wave buffering assembly, which includes a screw nut, a first wave piece, and a plurality of first balls interposed between the screw nut and the first wave piece. The surface of the first fluctuation piece opposite to the screw nut is provided with first rolling grooves corresponding to the first balls one by one, and the screw nut is fixedly connected with the first fluctuation piece, so that the first balls can roll in the first rolling grooves and are limited in the first rolling grooves.

In one embodiment, the wave buffering assembly further comprises a second wave piece and a plurality of second balls, the second wave piece is arranged on the side, away from the first wave piece, of the screw nut, and the second balls are clamped between the screw nut and the second wave piece; the surface of the second fluctuation piece opposite to the screw nut is provided with second rolling grooves corresponding to the second balls one to one, and the screw nut is fixedly connected with the second fluctuation piece so that the second balls can roll in the second rolling grooves and are limited in the second rolling grooves.

In one embodiment, the first balls are arranged around the transmission screw rod at equal intervals from head to tail in the circumferential direction with the transmission screw rod as an axis; and/or the second balls are distributed at equal intervals from head to tail in the circumferential direction taking the transmission screw rod as the axis.

In one embodiment, the first ball is spherical, the inner surface of the first rolling groove is spherical, the radius of the inner surface of the first rolling groove is equal to or larger than the spherical surface of the first ball, and the depth of the inner surface of the first rolling groove is smaller than or equal to the radius of the first ball, and/or the inner surface of the second rolling groove is spherical, the radius of the inner surface of the second rolling groove is equal to or larger than the spherical surface of the second ball, and the depth of the inner surface of the second rolling groove is smaller than or equal to the radius of the second ball.

In one embodiment, the wave buffering assembly further comprises a first connecting piece, wherein the first connecting piece is an axial step screw and is in threaded connection with the second wave part after sequentially passing through the first wave part and the screw nut.

On the other hand, this application embodiment provides a lead screw drive mechanism, including lead screw drive arrangement and connect in the transmission lead screw that the power take off end of lead screw drive arrangement connects. The screw rod transmission mechanism further comprises the fluctuation buffer assembly, the screw rod nut is sleeved and in threaded connection with the transmission screw rod, and the first fluctuation member is sleeved on the transmission screw rod.

In one embodiment, the first fluctuation part is in clearance fit with the transmission screw rod.

In one embodiment, the first fluctuation member is disposed above the screw nut, and the screw transmission mechanism further includes a motion structure connecting member, which is in clearance fit with the transmission screw and is fixedly connected to the first fluctuation member.

In one embodiment, the screw rod transmission mechanism further comprises a functional structural member, and the functional structural member is connected to the moving structure connecting member or is an integrated structure with the moving structure connecting member.

In another aspect, the present application provides a 3D printer, including the lead screw transmission mechanism as described above.

The embodiment of the utility model provides an undulant buffering subassembly, when being applied to screw drive mechanism, when screw-nut takes place undulant in the motion process, first ball can roll along with screw-nut, and the influence that the fluctuation brought when screw-nut is direct and the telecontrol equipment rigid coupling has been eliminated in the roll of ball to promote the shaping quality of printing the model. In addition, the balls are matched with the rolling grooves in a one-to-one correspondence mode, the structure and the manufacturing process are simple, and the cost is low.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a screw transmission mechanism according to a first embodiment of the present invention;

FIG. 2 is a schematic view of the lead screw actuator of FIG. 1;

FIG. 3 is a partially disassembled schematic view of the lead screw drive mechanism of FIG. 1;

FIG. 4 is an enlarged schematic view of section IV of FIG. 3;

FIG. 5 is an enlarged schematic view of portion V of FIG. 3;

fig. 6 is a schematic structural diagram of a 3D printer according to a second embodiment of the present invention;

fig. 7 is a schematic diagram of a three-axis transmission structure of the 3D printer in fig. 6.

Reference numerals: 100-a screw rod transmission mechanism; 10-a screw rod driving device; 20-a transmission screw rod; 30-a wave damping component; 31-a feed screw nut; 32-a first wave-motion member; 33-a first ball bearing; 34-a second undulation member; 35-a second ball bearing; 36-a second rolling groove; 37-a first connector; 321-stepped holes; 50-a kinematic structure connection; 60-functional structural parts; 70-a guide assembly; 51-a through hole; 52-a second connector; 53-first connection hole; 322-second connection hole; 71-optical axis fixing plate; 72-optical axis; 73-avoiding holes; 200-3D printer; 80-printer housing; 92-X axis transmission mechanism; 94-Y axis transmission mechanism; a 96-Z shaft transmission mechanism; 98-a printing platform; 99-print head

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

Referring to fig. 1 to 3, a first embodiment of the present invention provides a screw driving mechanism 100. The screw driving mechanism 100 may be used as a Z-axis driving mechanism, i.e., a vertical driving mechanism, of a 3D printer. The screw transmission mechanism 100 includes a screw driving device 10, a transmission screw 20, and a wave buffering assembly 30 mounted on the transmission screw 20.

In this embodiment, the lead screw driving device 10 is a stepping motor, the transmission lead screw 20 is connected to a power output end of the lead screw driving device 10, the lead screw driving device 10 is configured to drive the transmission lead screw 20 to rotate around a central axis thereof, and an external thread is disposed outside the transmission lead screw 20.

Referring to fig. 3 and 4, the wave damping assembly 30 includes a screw nut 31, a first wave element 32, and a plurality of first balls 33 sandwiched between the screw nut 31 and the first wave element 32. The feed screw nut 31 is sleeved and screwed on the transmission feed screw 20. The first oscillating member 32 is sleeved on the transmission screw rod 20, and the first oscillating member 32 is in clearance fit with the transmission screw rod 20. In the present embodiment, the first wave member 32 is disposed above the feed screw nut 31. The surface of the first wave-motion member 32 opposite to the screw nut 31 is provided with first rolling grooves (not shown) corresponding to the first balls 33, the number of the first rolling grooves is the same as the number of the first balls 33, in this embodiment, the number of the first balls 33 and the number of the first rolling grooves are 3, and the first rolling grooves are arranged end to end at equal intervals in the circumferential direction around the axial direction of the transmission screw 20 (screw nut 31). The first rolling ball 33 is a smooth curved surface whose surface includes a closed circle, for example, the first rolling ball 33 is a cylinder, which includes a cylindrical surface, such as an ellipsoid, and the like. In this embodiment, the surface of the first ball 33 is a spherical surface, i.e. the first ball 33 is spherical. The material of the first ball 33 is preferably metal, and in this embodiment, the first ball 33 is a steel ball. The inner surface of the first rolling groove is a curved surface matched with the first ball 33, so that the first ball 33 can roll in the first rolling groove, and the inner surface of the first rolling groove can limit the rolling range of the first ball 33, and prevent the first ball 33 from falling off from the first rolling groove. In this embodiment, the inner surface of the first rolling groove is a spherical surface having a radius equal to or larger than that of the first ball 33 and a depth equal to or smaller than that of the first ball 33.

It should be noted that the number of the first balls 33 and the first rolling grooves is not limited to 3, and may be more than 3, and when the number is more than 3, it is preferable that the plurality of first balls 33 are arranged at equal intervals end to end around the circumferential direction with the drive screw 20 as the axis. It should also be noted that the first balls 33 are arranged end to end at equal intervals, which means that the intervals between the first balls 33 are equal to the intervals between the other adjacent first balls 33, and the intervals between the first rolling grooves are equal to the intervals between the other adjacent first rolling grooves.

The wave buffering assembly 30 further includes a second wave member 34 disposed on a side of the screw nut 31 opposite to the first wave member 32, and a plurality of second balls 35 sandwiched between the screw nut 31 and the second wave member 34. The second oscillating member 34 is sleeved on the transmission screw 20, and the first oscillating member 32 is in clearance fit with the transmission screw. The second oscillating member 34 has the same structure as the first oscillating member 32, and a second rolling groove 36 corresponding to the second ball 35 is formed on a surface thereof facing the lead screw nut 31. The features of the second ball 35 and the second rolling groove 36 are the same as those of the first ball 33 and the first rolling groove, respectively, and thus, the description thereof is omitted.

The wave damping assembly 30 further comprises a first connecting member 37 for detachably fixing the first wave member 32, the lead screw nut 31 and the second wave member 34. In an alternative embodiment, the first connecting member 37 is a bolt, and is threaded to the second oscillating member 34 after passing through the first oscillating member 32 and the lead screw nut 31 in sequence, of course, the first connecting member 37 may be threaded to the first oscillating member 32 after passing through the second oscillating member 34 and the lead screw nut 31 in sequence, and the number of the first connecting members 37 is preferably plural to achieve a more stable connection. In this embodiment, the first connecting members 37 are stepped screws, and the number thereof is three. The first connecting member 37 passes through the first oscillating member 32 and the lead screw nut 31 in sequence and then is connected to the second oscillating member 34 by screw threads, and the screw head of the first connecting member 37 abuts against the surface of the first oscillating member 32 or the bottom surface of the stepped hole 321 formed in the first oscillating member 32. It is understood that the coupling position of the first coupling member 37 is offset from the arrangement positions of the first and

second balls

33 and 35.

In the present embodiment, the mode of arranging the heave plate and the balls on both opposite sides of the screw nut 31 is adopted, and it should be understood that in other embodiments, the heave plate and the balls may be arranged only on one side of the screw nut 31, and the present embodiment is not limited thereto; when only one set of the heave plate and the balls is provided, it is preferably provided above the lead screw nut 31.

Referring to fig. 5, the screw driving mechanism 100 further includes a moving structure connecting member 50, a functional structure member 60, and a guiding member 70. The motion structure member 50 is sleeved on the transmission screw rod 20 and connected with the first fluctuation part 32 of the fluctuation buffering assembly 30, the functional structure member 60 is connected and fixed to the motion structure connecting member 50, and the guiding assembly 70 is used for guiding the motion structure connecting member 50.

The movement structure connecting piece 50 is provided with a through hole 51 for the transmission screw rod 20 to pass through, and the transmission screw rod 20 is in clearance fit with the through hole 51. The exercise structure connecting member 50 is detachably and fixedly connected to the first wave piece 32 through a second connecting member 52, specifically, the exercise structure connecting member 50 is located at the periphery of the through hole 51 and is provided with a first connecting hole 53, the first wave piece 32 is provided with a second connecting hole 322 corresponding to the first connecting hole 53, and the second connecting member 52 is a screw and is in threaded connection with the second connecting hole 322 after passing through the first connecting hole 53.

In this embodiment, the functional structural member 60 and the motion structure connecting member 50 are integrally formed; in other embodiments, the functional structure 60 may be connected and fixed to the moving structure connector 50 by a connecting member, and is not limited to this embodiment. In this embodiment, functional structure 60 is the platform layer board for bearing print platform, the platform that is used for bearing the model when print platform prints for 3D can be for the print platform who is used for FDM 3D printer. Of course, the functional structure 60 may also be other structures, such as a model bearing platform in a photo-curing 3D printer, and is not limited to this embodiment.

The guiding assembly 70 includes an optical axis fixing plate 71 and an optical axis 72 connected to the optical axis fixing plate 71, the optical axis fixing plate 71 is connected to the lead screw driving device 10, and has an avoiding hole 73 for the transmission lead screw 20 to pass through. The end of the optical axis 72 is connected to the optical axis fixing plate 71 and located at the same side as the transmission screw rod 20, the optical axis 72 is parallel to the axial direction of the transmission screw rod 20, and the other end of the optical axis 72 passes through the moving structure connecting piece 50 to guide the movement of the moving structure connecting piece 50. In this embodiment, the number of the optical axes 72 is two, and the two optical axes are respectively disposed on two opposite sides of the transmission screw rod 20.

In the embodiment, when the screw nut 31 fluctuates during the movement, the first balls 33 and the second balls 35 roll along with the screw nut 31, and the rolling of the balls eliminates the influence of the fluctuation when the screw nut 31 is directly and rigidly connected with a moving device (such as the moving structure connecting piece 50), so that the forming quality of the printing model is improved. In addition, the balls are matched with the rolling grooves in a one-to-one correspondence manner, the structure and the manufacturing process are simple, the cost is low, three or more balls are adopted for each layer of balls, the fluctuation of the screw nut 31 generated in all directions can be effectively buffered, and the buffering effect is good.

Referring to fig. 6 and 7 together, the second embodiment of the present invention provides a 3D printer 200, and the 3D printer 200 of the present embodiment is described by taking an FDM 3D printer as an example. In this embodiment, the 3D printer 200 further includes a printer housing 80, an X-axis transmission mechanism 92, a Y-axis transmission mechanism 94, a Z-axis transmission mechanism 96, a printing platform 98, and a printing head 99.

The X-axis transmission mechanism 92, the Y-axis transmission mechanism 94, the Z-axis transmission mechanism 96 and the printing nozzle 99 are all disposed in the printer housing 80, the X-axis transmission mechanism 92 and the Y-axis transmission mechanism 94 are horizontal transmission mechanisms for driving the printing nozzle 99 to move along a horizontal plane, and the printing nozzle 99 is connected to the X-axis transmission mechanism 92. The Z-axis transmission mechanism employs a lead screw transmission mechanism 100 as described in the first embodiment, in which the printing platform 98 is provided on the functional structure 60, i.e., the platform pallet.

The 3D printer 200 of this embodiment adopts the lead screw transmission mechanism 100, and the rolling of the balls eliminates the influence of fluctuation when the lead screw nut 31 is directly connected with the moving device (such as the moving structure connecting piece 50) by hard coupling, thereby improving the molding quality of the printing model.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A surge damping assembly (30), comprising:

the screw rod nut (31), the first fluctuation piece (32) and a plurality of first balls (33) clamped between the screw rod nut (31) and the first fluctuation piece (32); the surface of the first fluctuation part (32) opposite to the screw nut (31) is provided with first rolling grooves corresponding to the first balls (33) one by one, and the screw nut (31) is fixedly connected with the first fluctuation part (32) so that the first balls (33) can roll in the first rolling grooves and are limited in the first rolling grooves.

2. The surge damping assembly (30) according to claim 1, wherein the surge damping assembly (30) further comprises a second wave member (34) and a plurality of second balls (35), the second wave member (34) is disposed on a side of the screw nut (31) opposite to the first wave member (32), and the second balls (35) are sandwiched between the screw nut (31) and the second wave member (34); the surface of the second fluctuation part (34) opposite to the screw nut (31) is provided with second rolling grooves (36) corresponding to the second balls (35) one by one, and the screw nut (31) and the second fluctuation part (34) are connected and fixed, so that the second balls (35) can roll in the second rolling grooves (36) and are limited in the second rolling grooves (36).

3. The surge damping assembly (30) according to claim 2, wherein the first plurality of balls (33) are arranged at equal intervals end to end about a circumferential direction centered on the drive screw (20); and/or the second balls (35) are arranged at equal intervals end to end in the circumferential direction taking the transmission screw rod (20) as an axis.

4. A wave damping assembly (30) according to claim 2, wherein the first ball (33) is spherical and the inner surface of the first rolling groove is spherical with a radius equal to or larger than the spherical surface of the first ball (33) and a depth equal to or smaller than the radius of the first ball (33), and/or

The second ball (35) is spherical, the inner surface of the second rolling groove (36) is a spherical surface with the radius equal to or larger than that of the second ball (35), and the depth is smaller than or equal to that of the second ball (35).

5. The surge damping assembly (30) according to claim 2, wherein the surge damping assembly (30) further comprises a first connecting member (37), the first connecting member (37) being an offset screw that is threaded through the first wave member (32), the lead screw nut (31) and the second wave member (34) in sequence.

6. A lead screw drive mechanism (100) comprising a lead screw drive device (10) and a drive lead screw (20) connected to a power output end of the lead screw drive device (10), wherein the lead screw drive mechanism (100) further comprises a fluctuation damping assembly (30) according to any one of claims 1 to 5, the lead screw nut (31) is sleeved and screwed to the drive lead screw (20), and the first fluctuation member (32) is sleeved on the drive lead screw (20).

7. Screw drive (100) according to claim 6, wherein the first wave member (32) is clearance-fitted with the drive screw (20).

8. The spindle drive (100) according to claim 6, wherein the first oscillating member (32) is arranged above the spindle nut (31), the spindle drive further comprising a kinematic structure coupling (50), the kinematic structure coupling (50) being in a clearance fit with the drive spindle (20) and being fixedly connected to the first oscillating member (32).

9. The screw drive (100) according to claim 8, wherein the screw drive (100) further comprises a functional structural member (60), the functional structural member (60) being connected to the moving structure connector (50) or being an integral structure with the moving structure connector (50).

10. A 3D printer (200) comprising a lead screw drive (100) according to any one of claims 6 to 9.