Transmission mechanism and 3D printer
By using a transmission mechanism in a 3D printer, using the combination of screw, screw nut and fastener, the loosening problem caused by the gap between the screw and nut is solved, and high-precision positioning and repeated positioning are achieved, which improves printing quality and reduces processing costs.
Patent Information
- Application Number
- CN202422537570.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-21
AI Technical Summary
There is a gap between the screw rod and nut in the existing 3D printer, which causes loose movement and swimming, affecting the accuracy of precise positioning and repeated positioning, and thus affecting the printing quality.
The transmission mechanism is adopted, including a screw, a screw nut and a fastener. By setting openings on the screw nut and connecting it with a fastener, the gap between the screw rod and the screw nut is reduced or eliminated, and the sliding accuracy is improved by using the ball and groove structure to ensure the parallelism between the screw rod nut and the connecting bracket.
The movement accuracy and repeat positioning accuracy of screw nuts on the screw are improved, ensuring accurate positioning and repeated positioning of the printing bed are improved, printing quality is improved, and processing costs and assembly difficulty of parts are reduced.
Smart Images
Figure CN223266277U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of printers, and in particular to a transmission mechanism and a 3D printer. Background Art
[0002] 3D printer is a type of rapid prototyping technology. It is a technology that uses digital model files as the basis and uses special wax materials, powdered metal or plastic and other adhesive materials to construct objects by printing layer by layer.
[0003] Existing 3D printers typically use a screw-nut transmission mechanism to drive the print platform to complete printing. However, there is a gap between the screw and the nut when they fit together. Especially during horizontal movement along the Y-axis, this gap causes the screw to loosen and move during movement, making it impossible for the 3D printer to achieve precise positioning or high-precision repeatable positioning, thereby affecting print quality. Therefore, a transmission mechanism is urgently needed. Utility Model Content
[0004] The purpose of the utility model is to provide a transmission mechanism to improve the positioning accuracy and repeat positioning accuracy of a 3D printer.
[0005] Another object of the present invention is to provide a 3D printer that improves printing quality by providing the above-mentioned transmission mechanism.
[0006] To achieve this purpose, the present invention adopts the following technical solutions:
[0007] Transmission mechanism, including:
[0008] A screw rod, the screw rod being rotatably arranged on the printer base;
[0009] A screw nut, wherein the screw nut is provided with a through hole and an opening that are interconnected, the opening passes through the screw nut along the axial direction of the through hole, the screw rod is passed through the through hole and is threadedly connected to the screw nut, and the screw nut can move along the extension direction of the screw rod;
[0010] A fastener is provided, which passes through the opening along a direction perpendicular to the axial direction of the through hole to connect the screw rod and the screw rod nut.
[0011] Furthermore, the transmission mechanism also includes a connecting bracket, the screw nut is connected to the connecting bracket, the connecting bracket is connected to the print bed, and the screw nut drives the print bed to move through the connecting bracket.
[0012] Furthermore, a first groove is provided on the screw nut, and the extension direction of the first groove is perpendicular to the movement direction of the screw nut. A second groove is provided on the connecting bracket, and a first ball is embedded in the second groove and located between the first groove and the second groove. The first ball slides in conjunction with the first groove.
[0013] Furthermore, the screw nut is also provided with a third groove, the first groove and the third groove are symmetrically arranged on both sides of the screw nut, the transmission mechanism also includes a fixing part, the fixing part is connected to the connecting bracket, and a fourth groove is provided on the fixing part, the second ball is embedded in the fourth groove and is located between the third groove and the fourth groove, and the second ball is slidably fitted with the third groove.
[0014] Furthermore, the first groove and the third groove are both V-shaped grooves.
[0015] Furthermore, the connecting bracket includes a first extension portion and a second extension portion, the second groove is arranged on the first extension portion, the fixing member is connected to the second extension portion, the screw nut includes a first connecting portion and a second connecting portion, the second connecting portion is arranged on the first connecting portion, the first connecting portion is used to connect to the screw, the second connecting portion is clamped between the first extension portion and the second extension portion, and the first groove and the third groove are symmetrically arranged on both sides of the second connecting portion.
[0016] Furthermore, the transmission mechanism further includes a guide rod, both ends of which are arranged on the printer base, the extension direction of the guide rod is consistent with the extension direction of the screw rod, and the connecting bracket is slidably matched with the guide rod.
[0017] Furthermore, the transmission mechanism further includes a driving assembly, which includes a driving member and a conveyor belt, and the driving member drives the screw to rotate through the conveyor belt.
[0018] Furthermore, the transmission mechanism further includes bearings, two of the bearings are spaced apart and arranged on the printer base, and both ends of the screw rod are respectively passed through the two bearings.
[0019] A 3D printer comprises a printer base, a print bed and a transmission mechanism as described in any of the above solutions, wherein the transmission mechanism is arranged on the printer base and can drive the print bed to move.
[0020] Beneficial effects of the utility model:
[0021] The utility model provides a transmission mechanism, which includes a screw, a screw nut, and a fastener. The screw is rotatably arranged on the printer base; the screw nut is provided with a through hole and an opening that are interconnected, the opening extending through the screw nut along the axial direction of the through hole, the screw is inserted into the through hole and is threadedly connected to the screw nut, and the screw nut is capable of moving along the extension direction of the screw; the fastener extends through the opening in a direction perpendicular to the axial direction of the through hole to connect the screw and the screw nut. By providing an opening in the screw nut and fastening it with a fastener, the transmission mechanism minimizes the gap between the screw and the screw nut to zero, thereby improving the accuracy of the screw nut's movement on the screw and the accuracy of its repeated positioning. By providing a first groove and a first ball bearing, the screw nut can slide along the direction in which the first groove extends, ensuring the required parallelism between the axis of the screw nut and the axis of the guide rod.
[0022] The utility model also provides a 3D printer, which improves printing quality by arranging a transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a first schematic diagram of the 3D printer structure provided by an embodiment of the present utility model;
[0024] Figure 2 This is a second schematic diagram of the 3D printer structure provided by an embodiment of the present utility model;
[0025] Figure 3 This is a first schematic diagram of the cooperation structure between the first ball and the second ball and the screw nut provided in an embodiment of the present utility model;
[0026] Figure 4 This is a second schematic diagram of the cooperation structure between the first ball and the second ball and the screw nut provided in an embodiment of the present utility model;
[0027] Figure 5 This is a schematic structural diagram of a connecting bracket provided by an embodiment of the present utility model;
[0028] Figure 6 It is a structural schematic diagram of a fixing member provided in an embodiment of the present utility model.
[0029] In the picture:
[0030] 1. Screw; 2. Screw nut; 21. First connecting portion; 211. Through hole; 212. Opening; 22. Second connecting portion; 221. First groove; 222. Third groove; 3. Fastener; 4. Connecting bracket; 41. First extension; 411. Second groove; 42. Second extension; 5. First ball bearing; 6. Fixing member; 61. Fourth groove; 7. Second ball bearing; 8. Guide rod; 91. Driving member; 92. Conveyor belt; 93. Mounting seat; 10. Bearing; 11. Bearing cap
[0031] 100. Printer base; 200. Print bed; 300. Print head; 400. First guide assembly; 500. Second guide assembly. DETAILED DESCRIPTION
[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.
[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0035] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0036] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.
[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.
[0039] The following combination Figures 1-6 The technical solution of the utility model is described in detail through specific implementation methods.
[0040] In order to improve the positioning accuracy and repeatability of a 3D printer, an embodiment of the present invention provides a transmission mechanism, which includes a screw 1, a screw nut 2 and a fastener 3. The screw 1 is rotatably arranged on the printer base 100; the screw nut 2 is provided with a through hole 211 and an opening 212 that are interconnected, and the opening 212 passes through the screw nut 2 along the axial direction of the through hole 211. The screw 1 is inserted into the through hole 211 and is threadedly connected to the screw nut 2. The screw nut 2 can move along the extension direction of the screw 1; along a direction perpendicular to the axial direction of the through hole 211, the fastener 3 passes through the opening 212 to connect the screw 1 and the screw nut 2.
[0041] Specifically, the screw nut 2 is provided with an internal thread, the screw 1 is provided with an external thread, both ends of the screw 1 are provided on the printer base 100, the screw 1 is provided through the through hole 211 on the screw nut 2, and the screw nut 2 is provided with a first mounting hole, the axial direction of the first mounting hole is perpendicular to the axial direction of the through hole 211, and the fastener 3 passes through the opening 212 and is provided in the first mounting hole to connect the screw 1 and the screw nut 2. The screw 1 rotates relative to the screw nut 2, thereby pushing the screw nut 2 to move along the first horizontal direction, thereby driving the printing bed 200 to move. By providing the opening 212 on the screw nut 2 and fastening it with the fastener 3, the transmission mechanism makes the gap between the screw 1 and the screw nut 2 extremely small or even zero, thereby improving the accuracy of the movement of the screw nut 2 on the screw 1 and the accuracy of repeated positioning. It should be noted that the first horizontal direction is consistent with the extension direction of the screw 1.
[0042] Furthermore, the width of the opening 212 is generally 0.1-5 mm, and preferably 0.5-1 mm, which is convenient for processing and fastening by the fastener 3 .
[0043] Further, if Figure 2 As shown, the transmission mechanism also includes bearings 10. Two bearings 10 are spaced apart on the printer base 100. The ends of the screw 1 are respectively inserted into the two bearings 10. The bearings 10 can support the screw 1, improve the smoothness of the screw 1's movement, and reduce friction during the rotation of the screw 1. A bearing cover 11 is provided above the bearings 10 to prevent dust and ensure the normal operation of the bearings 10.
[0044] Furthermore, the transmission mechanism also includes a driving assembly, which includes a driving member 91 and a conveyor belt 92. A mounting seat 93 is provided on the printer base 100. The driving member 91 is fixed on the mounting seat 93. One end of the screw rod 1 is transmission-connected to the conveyor belt 92. The driving member 91 drives the screw rod 1 to rotate through the conveyor belt 92.
[0045] In order to better drive the print bed 200 to move, the transmission mechanism in this embodiment also includes a connecting bracket 4, one end of the connecting bracket 4 is connected to the print bed 200, and the other end is connected to the screw nut 2. The screw nut 2 drives the connecting bracket 4 to move, thereby completing the movement of the print bed 200 along the first horizontal direction.
[0046] Furthermore, in order to guide the movement of the connecting bracket 4, the transmission structure also includes a guide rod 8, both ends of which are arranged on the printer base 100, and its extension direction is consistent with the extension direction of the screw 1. When the screw nut 2 moves along the first horizontal direction, it drives the connecting bracket 4 to move along the extension direction of the guide rod 8. The guide rod 8 can guide the movement of the connecting bracket 4 and improve the stability of the movement of the connecting bracket 4.
[0047] When the screw 1 drives the printing bed 200 to move along the first horizontal direction, there is a high requirement for the parallelism between the axis of the screw 1 and the axis of the guide rod 8. However, the screw 1 is a slender structure. If its straightness is to be guaranteed, the processing tolerance is very high. At the same time, the difficulty of assembling the parts will also increase. Therefore, the processing cost of the parts will be greatly increased. In this embodiment, fine adjustment is generated between the screw nut 2 and the connecting bracket 4 to ensure the parallelism between the axis of the screw 1 and the axis of the guide rod 8. In detail, as shown in FIG. Figure 3-Figure 5As shown, the screw nut 2 includes a first connecting part 21 and a second connecting part 22, the through hole 211 and the opening 212 are both arranged on the first connecting part 21, the first connecting part 21 is used to connect with the screw 1, and the second connecting part 22 is arranged on the first connecting part 21 for connecting with the connecting bracket 4; a first groove 221 is provided on the second connecting part 22, and the extension direction of the first groove 221 is perpendicular to the movement direction of the screw nut 2. The connecting bracket 4 includes a first extension portion 41 and a second extension portion 42. The second connecting portion 22 is clamped between the first extension portion 41 and the second extension portion 42. A second groove 411 is provided on the surface opposite to the first extension portion 41 and the second connecting portion 22. The first ball 5 is embedded in the second groove 411 and is located between the first groove 221 and the second groove 411. The second groove 411 supports the first ball 5. The first ball 5 slides in conjunction with the first groove 221, and the surface of the second connecting portion 22 provided with the first groove 221 and the surface of the first extension portion 41 provided with the second groove 411 can fit tightly. During the movement of the screw nut 2, the second connecting portion 22 can slide seamlessly along the extension direction of the first groove 221 under the action of the first ball 5, so that fine-tuning is generated between the screw nut 2 and the connecting bracket 4, thereby ensuring the parallelism requirement between the axis of the screw nut 2 and the axis of the guide rod 8, and further ensuring that the printing bed 200 can be accurately positioned or repeatedly positioned at any position within the movement range of the guide rod 8, while also reducing the processing difficulty of the screw 1 and reducing costs.
[0048] Optionally, the second connecting portion 22 is further provided with a third groove 222, and the first groove 221 and the third groove 222 are symmetrically provided on both sides of the second connecting portion 22. Figure 6 As shown, the transmission mechanism also includes a fixing member 6, which is connected to the second extension portion 42. A fourth groove 61 is provided on the surface of the fixing member 6 opposite to the second connecting portion 22. The second ball 7 is embedded in the fourth groove 61 and is located between the third groove 222 and the fourth groove 61. The fourth groove 61 supports the second ball 7. The second ball 7 slides with the third groove 222, and the surface of the second connecting portion 22 provided with the third groove 222 and the surface of the fixing member 6 provided with the fourth groove 61 can fit tightly. During the movement of the screw nut 2, the second connecting portion 22 can slide along the extension direction of the first groove 221 under the action of the first ball 5 and the second ball 7. The provision of the third groove 222 can reduce the friction force when the screw 1 slides along the extension direction of the first groove 221, thereby improving the adjustment accuracy of the screw nut 2.
[0049] Furthermore, the fixing member 6 is provided on the second mounting hole, and the bolt is passed through the second mounting hole to fix the fixing member 6 on the connecting bracket 4 .
[0050] Furthermore, the number of first balls 5 can be one, two, or three, etc., preferably two. The two first balls 5 are spaced apart in the second groove 411 along the extension direction of the second groove 411, so that the screw nut 2 can slide under the action of the first balls 5 during movement. The first balls 5 are steel balls, which have high strength and reliable performance. It should be noted that in this embodiment, the first balls 5 are the same as the second balls 7, and the number and material of the second balls 7 are consistent with those of the first balls 5, and will not be described in detail here.
[0051] Furthermore, the first groove 221 and the third groove 222 are both V-shaped grooves, which can reduce the friction between the first ball 5 and the first groove 221 and the second ball 7 and the third groove 222, thereby facilitating adjustment of the screw nut 2 during movement. Optionally, the angle of the V-shaped groove ranges from 30° to 270°, with a preferred angle range of 90°, which can ensure the positioning accuracy of the screw nut 2.
[0052] An embodiment of the present invention also provides a 3D printer, including a printer base 100, a print bed 200 and a transmission mechanism. The transmission mechanism is arranged on the printer base 100, and the transmission mechanism can drive the print bed 200 to move along a first horizontal direction, so that the print bed 200 can be accurately positioned or repeatedly positioned at any position within the motion range, thereby ensuring printing quality and reducing the processing cost and assembly difficulty of parts.
[0053] The 3D printer in this embodiment further includes a print head 300, a first guide assembly 400, and a second guide assembly 500. The print head 300 moves along the first guide assembly 400 to complete printing in the second horizontal direction. The print bed 200 moves along the guide rod 8 to complete printing in the first horizontal direction. The print bed 200 moves along the second guide assembly 500 to complete printing in the vertical direction, thereby completing 3D printing. The first horizontal direction is perpendicular to the second horizontal direction.
[0054] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. Transmission mechanism, characterized in that: include: A screw rod (1), the screw rod (1) being rotatably mounted on a printer base (100); A screw nut (2), the screw nut (2) being provided with a through hole (211) and an opening (212) that are interconnected, the opening (212) penetrating the screw nut (2) along the axial direction of the through hole (211), the screw (1) being passed through the through hole (211) and being threadedly connected to the screw nut (2), and the screw nut (2) being capable of moving along the extension direction of the screw (1); A fastener (3) passes through the opening (212) in a direction perpendicular to the axial direction of the through hole (211) to connect the screw rod (1) and the screw rod nut (2).
2. The transmission mechanism according to claim 1, characterized in that: The transmission mechanism further comprises a connecting bracket (4), the screw nut (2) is connected to the connecting bracket (4), the connecting bracket (4) is connected to the printing bed (200), and the screw nut (2) drives the printing bed (200) to move via the connecting bracket (4).
3. The transmission mechanism according to claim 2, characterized in that: The screw nut (2) is provided with a first groove (221), the extension direction of the first groove (221) is perpendicular to the movement direction of the screw nut (2), the connecting bracket (4) is provided with a second groove (411), the first ball (5) is embedded in the second groove (411), and is located between the first groove (221) and the second groove (411), and the first ball (5) is slidably matched with the first groove (221).
4. The transmission mechanism according to claim 3, characterized in that: The screw nut (2) is further provided with a third groove (222), the first groove (221) and the third groove (222) are symmetrically arranged on both sides of the screw nut (2), the transmission mechanism further comprises a fixing member (6), the fixing member (6) is connected to the connecting bracket (4), a fourth groove (61) is provided on the fixing member (6), a second ball (7) is embedded in the fourth groove (61), and is located between the third groove (222) and the fourth groove (61), and the second ball (7) is slidably matched with the third groove (222).
5. The transmission mechanism according to claim 4, characterized in that: The first groove (221) and the third groove (222) are both V-shaped grooves.
6. The transmission mechanism according to claim 4, characterized in that: The connecting bracket (4) comprises a first extension portion (41) and a second extension portion (42), the second groove (411) is arranged on the first extension portion (41), the fixing member (6) is connected to the second extension portion (42), the screw nut (2) comprises a first connecting portion (21) and a second connecting portion (22), the second connecting portion (22) is arranged on the first connecting portion (21), the first connecting portion (21) is used to connect with the screw (1), the second connecting portion (22) is clamped between the first extension portion (41) and the second extension portion (42), and the first groove (221) and the third groove (222) are symmetrically arranged on both sides of the second connecting portion (22).
7. The transmission mechanism according to claim 2, characterized in that: The transmission mechanism further comprises a guide rod (8), both ends of which are arranged on the printer base (100), the extension direction of the guide rod (8) is consistent with the extension direction of the screw rod (1), and the connecting bracket (4) is slidably matched with the guide rod (8).
8. The transmission mechanism according to any one of claims 1 to 7, characterized in that: The transmission mechanism further comprises a driving assembly, wherein the driving assembly comprises a driving member (91) and a conveyor belt (92), and the driving member (91) drives the screw rod (1) to rotate via the conveyor belt (92).
9. The transmission mechanism according to any one of claims 1 to 7, characterized in that: The transmission mechanism further comprises a bearing (10), two bearings (10) are arranged on the printer base (100) at intervals, and two ends of the screw rod (1) are respectively passed through the two bearings (10).
10. A 3D printer, characterized in that The invention comprises a printer base (100), a printing bed (200) and a transmission mechanism according to any one of claims 1 to 9, wherein the transmission mechanism is arranged on the printer base (100) and can drive the printing bed (200) to move.