A continuous fiber shearing device

Abstract

The utility model discloses a continuous fiber's shearing mechanism relates to 3D printing technical field, including the connecting frame, driving element, transmission element and shearing element, one side of connecting frame is used for connecting the print head, and the nozzle of print head is used for extruding continuous fiber composite material wire material, driving element installs on connecting frame, and driving element is connected the mounting end of shearing element through transmission element, and the shearing end of shearing element is close to the setting of nozzle, and shearing element is used for cutting off the continuous fiber composite material wire material of nozzle extrusion. The utility model discloses simple structure, and improves the reliability of continuous fiber reinforced composite material wire material shearing.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a continuous fiber shearing device. Background Technology

[0002] With the rapid development of 3D printing technology, the application of continuous fiber reinforced composite materials in the field of 3D printing rapid prototyping is gradually unfolding. 3D printing technology for continuous fiber reinforced composite materials offers significant manufacturing flexibility. By using the nozzle of a 3D printer to deposit and form continuous fiber composite materials layer by layer, it enables the rapid prototyping of complex structural parts and the functional design and manufacturing of parts, meeting the application requirements of high-strength applications where ordinary materials cannot meet the demands.

[0003] For 3D printing of continuous fiber reinforced composite materials, during the layer-by-layer deposition process, it is necessary to cut the continuous fibers between layers, and also between multiple discontinuous printing paths within a single layer, in order to reduce molding defects such as material interference, deformation, internal stress and voids between and within the printed layers, and to ensure the molding quality and mechanical properties of 3D printed continuous fiber reinforced thermoplastic composite materials.

[0004] However, existing research and design of shearing mechanisms for printing continuous fiber materials still have some problems. For example, most existing shearing mechanisms cut the filament at the far end instead of at the nozzle, which may cause the filament remaining in the nozzle to continue to be extruded, affecting the molding quality. In addition, some designs use near-end shearing, that is, cutting directly under the nozzle, but the structural design is still difficult to meet the usage requirements, such as not considering the collision interference between the cutter and the molding model, complex structure, and excessively long response time. Utility Model Content

[0005] The purpose of this invention is to provide a continuous fiber shearing device to solve the problems existing in the prior art. It has a simple structure and improves the reliability of shearing continuous fiber reinforced composite filaments.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a continuous fiber shearing device, including a connecting frame, a driving element, a transmission element, and a shearing element. One side of the connecting frame is used to connect a print head. The nozzle of the print head is used to extrude continuous fiber composite material filaments. The driving element is mounted on the connecting frame and is connected to the mounting end of the shearing element through the transmission element. The shearing end of the shearing element is located close to the nozzle, and the shearing element is used to cut the continuous fiber composite material filaments extruded by the nozzle.

[0008] Preferably, the connecting frame includes a vertical plate and a horizontal plate, the vertical plate is mounted on one end of the horizontal plate and the vertical plate is perpendicular to the horizontal plate, the inner side of the vertical plate is used to mount the driving element, and the inner side of the horizontal plate is used to connect the print head.

[0009] Preferably, a fixed cover plate is fixed to the upper inner side of the horizontal plate, and a movable cover plate is connected to one side of the fixed cover plate. The fixed cover plate and the movable cover plate can clamp the print head.

[0010] Preferably, the inner side of the connecting frame is provided with a fixed shell, the transmission element is installed in the fixed shell, and the output shaft of the drive element can pass through the side wall of the fixed shell and be connected to the input shaft of the transmission element.

[0011] Preferably, the transmission element includes a driving gear and a driven gear. The driving gear is coaxially connected to the output shaft of the driving element. The outer periphery of the driving gear meshes with the outer periphery of the driven gear, and the two ends of the connecting shaft of the driven gear are respectively rotatably connected to the two inner sidewalls of the fixed housing.

[0012] Preferably, the connecting shaft is a stepped shaft, and one end of the stepped shaft is rotatably connected to an inner wall of the fixed shell through a first bearing, and the other end of the stepped shaft is rotatably connected to another inner wall of the fixed shell through a second bearing.

[0013] Preferably, the shearing element includes a first handle, a second handle, and two blades. The upper end of the first handle is eccentrically connected to the drive gear, and the upper end of the second handle is eccentrically connected to the driven gear. The middle portions of the first handle and the second handle are hinged together. The lower ends of the first handle and the second handle are respectively connected to one of the blades. The two blades can extend below the nozzle and can swing towards each other or away from each other under the drive of the drive gear and the driven gear, and can cut the continuous fiber composite filaments extruded from the nozzle.

[0014] Preferably, the two blades are arranged at an angle, and the lower ends of the two blades are close to each other.

[0015] Preferably, the driving element is a drive motor.

[0016] Preferably, the driving element is electrically connected to a control element, which is used to control the opening, closing, and forward / reverse rotation of the driving element.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] The continuous fiber shearing device provided by this utility model includes a connecting frame, a driving element, a transmission element, and a shearing element. One side of the connecting frame is used to connect a print head. The nozzle of the print head is used to extrude continuous fiber composite material filaments. The driving element is mounted on the connecting frame and is connected to the mounting end of the shearing element through the transmission element. The shearing end of the shearing element is set close to the nozzle, and the shearing element is used to cut the continuous fiber composite material filaments extruded by the nozzle, thereby realizing proximal shearing. At the same time, the cutting and resetting of the continuous fiber composite material filaments by the shearing element can be realized by only the forward and reverse rotation of one driving element. The overall structure is simple and improves the reliability of continuous fiber reinforced composite material filament shearing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the continuous fiber shearing device in this utility model;

[0021] Figure 2 This is a schematic diagram of the continuous fiber shearing device of this utility model after concealing the connecting frame and driving element;

[0022] Figure 3 This is a schematic diagram of the structure of the transmission element and the shearing element in this utility model;

[0023] Figure 4 This is a schematic diagram of the connecting frame in this utility model;

[0024] In the diagram: 1-Connecting frame, 2-Print head, 3-Drive element, 4-Fixed housing, 5-Driven gear, 6-Drive gear, 7-First blade holder, 8-Blade, 9-Second blade holder, 10-Hinge, 11-First bearing, 12-Connecting shaft, 13-Second bearing, 14-Modible cover plate, 15-Nozzle, 16-Sleeve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a continuous fiber shearing device to solve the problems existing in the prior art. It has a simple structure and improves the reliability of shearing continuous fiber reinforced composite filaments.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-4 As shown, this embodiment provides a continuous fiber shearing device, including a connecting frame 1, a driving element 3, a transmission element, and a shearing element. One side of the connecting frame 1 is used to connect a print head 2. The nozzle 15 of the print head 2 is used to extrude continuous fiber composite material filaments. The driving element 3 is mounted on the connecting frame 1, and the driving element 3 is connected to the mounting end of the shearing element through the transmission element. The shearing end of the shearing element is set close to the nozzle 15, and the shearing element is used to cut the continuous fiber composite material filaments extruded by the nozzle 15, thereby realizing proximal shearing. At the same time, the cutting and resetting of the continuous fiber composite material filaments by the shearing element can be realized by only the forward and reverse rotation of the driving element 3. The overall structure is simple and improves the reliability of continuous fiber reinforced composite material shearing.

[0029] Specifically, the connecting frame 1 includes a longitudinal plate and a transverse plate. The longitudinal plate is installed at one end of the transverse plate and the longitudinal plate is perpendicular to the transverse plate. The inner side of the longitudinal plate is used to install the driving element 3, and the inner side of the transverse plate is used to connect the print head 2. This allows the continuous fiber shearing device in this embodiment to be placed at the print head 2 to facilitate proximal shearing.

[0030] A fixed cover plate is fixed to the upper inner side of the horizontal plate. A movable cover plate 14 is connected to one side of the fixed cover plate. The fixed cover plate and the movable cover plate 14 are connected by bolts. After the fixed cover plate and the movable cover plate 14 are connected, they can form a cylindrical cavity, which can clamp the print head 2.

[0031] The inner side of the connecting frame 1 is provided with a fixed shell 4. The transmission element is installed in the fixed shell 4, and the fixed shell 4 is used to encapsulate and fix the transmission element. The output shaft of the drive element 3 can pass through the side wall of the fixed shell 4 and be connected to the input shaft of the transmission element. The drive element 3 drives the transmission element to move, so as to drive the shearing element to shear.

[0032] The transmission element includes a driving gear 6 and a driven gear 5. The driving gear 6 is coaxially connected to the output shaft of the driving element 3, and thus drives the driving gear 6 to rotate through the driving element 3. The outer circumference of the driving gear 6 meshes with the outer circumference of the driven gear 5, and thus drives the driven gear 5 to rotate through the driving gear 6. The two ends of the connecting shaft 12 of the driven gear 5 are respectively rotatably connected to the two inner side walls of the fixed shell 4 to ensure the stability of the driven gear 5 when rotating.

[0033] The connecting shaft 12 is a stepped shaft, and one end of the stepped shaft is rotatably connected to an inner wall of the fixed housing 4 through a first bearing 11. The other end of the stepped shaft is rotatably connected to another inner wall of the fixed housing 4 through a second bearing 13. A sleeve 16 is fitted on the outer periphery of the stepped shaft near the second bearing 13, and the axial movement of the driven gear 5 is restricted by the sleeve 16. While fixing the driven gear 5 in the fixed housing 4 through the connecting shaft 12, the stable rotation of the driven gear 5 is not affected.

[0034] The shearing element includes a first blade holder 7, a second blade holder 9, and two blades 8. The upper end of the first blade holder 7 is eccentrically connected to the drive gear 6, and the upper end of the second blade holder 9 is eccentrically connected to the driven gear 5. The middle parts of the first blade holder 7 and the middle parts of the second blade holder 9 are hinged, preferably by a hinge 10. The lower ends of the first blade holder 7 and the second blade holder 9 are respectively connected to a blade 8. By rotating the drive element 3 in both directions, the rotation direction of the drive gear 6 and the driven gear 5 can be changed. The reciprocating rotation of the drive gear 6 and the driven gear 5 drives the first blade holder 7 and the second blade holder 9 to swing back and forth, so that the two blades 8 swing towards each other or away from each other, thus closing and opening the two blades 8. The two blades 8 can extend below the nozzle 15, so that the continuous fiber composite material filaments extruded at the nozzle 15 can be cut as the two blades 8 move.

[0035] The two blades 8 are set at an angle, and the lower ends of the two blades 8 are close to each other, so that when the two blades 8 swing, they can act on the continuous fiber composite material filament extruded at the nozzle 15 and cut it.

[0036] The driving element 3 is a drive motor.

[0037] The drive element 3 is electrically connected to a control element, which controls the opening, closing, and forward / reverse rotation of the drive element 3 to achieve automatic control. During operation, after the drive element 3 is energized in response to the command of the control element, it drives the drive gear 6 to rotate. The drive gear 6 drives the driven gear 5 to rotate, thereby driving the first cutter holder 7 and the second cutter holder 9 to close, so that the two blades 8 work together to cut the continuous fiber-reinforced composite filament below the nozzle 15 of the print head 2. After the cutting is completed, the control element controls the drive element 3 to reverse, driving the first cutter holder 7 and the second cutter holder 9 to return to the unfolded state.

[0038] The continuous fiber shearing device in this embodiment, through the above-described structural design, adopts a near-end shearing method. It only requires the forward and reverse rotation of a drive motor to cut the continuous fiber reinforced composite filament with blade 8 and then reset it, avoiding collision interference that blade 8 may cause during model printing and improving the reliability of continuous fiber reinforced composite filament shearing.

[0039] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A continuous fiber shearing device, characterized in that: The device includes a connecting frame, a driving element, a transmission element, and a shearing element. One side of the connecting frame is used to connect to a print head. The nozzle of the print head is used to extrude continuous fiber composite material filaments. The driving element is mounted on the connecting frame and is connected to the mounting end of the shearing element through the transmission element. The shearing end of the shearing element is located close to the nozzle and is used to cut the continuous fiber composite material filaments extruded by the nozzle.

2. The continuous fiber shearing device according to claim 1, characterized in that: The connecting frame includes a vertical plate and a horizontal plate. The vertical plate is installed at one end of the horizontal plate and is perpendicular to the horizontal plate. The inner side of the vertical plate is used to install the driving element, and the inner side of the horizontal plate is used to connect the print head.

3. The continuous fiber shearing device according to claim 2, characterized in that: A fixed cover plate is fixed to the upper inner side of the horizontal plate, and a movable cover plate is connected to one side of the fixed cover plate. The fixed cover plate and the movable cover plate can clamp the print head.

4. The continuous fiber shearing device according to claim 1, characterized in that: The inner side of the connecting frame is provided with a fixed shell, the transmission element is installed in the fixed shell, and the output shaft of the drive element can pass through the side wall of the fixed shell and be connected to the input shaft of the transmission element.

5. The continuous fiber shearing device according to claim 4, characterized in that: The transmission element includes a driving gear and a driven gear. The driving gear is coaxially connected to the output shaft of the driving element. The outer circumference of the driving gear meshes with the outer circumference of the driven gear, and the two ends of the connecting shaft of the driven gear are respectively rotatably connected to the two inner sidewalls of the fixed shell.

6. The continuous fiber shearing device according to claim 5, characterized in that: The connecting shaft is a stepped shaft, and one end of the stepped shaft is rotatably connected to an inner wall of the fixed shell through a first bearing, and the other end of the stepped shaft is rotatably connected to another inner wall of the fixed shell through a second bearing.

7. The continuous fiber shearing device according to claim 5, characterized in that: The shearing element includes a first handle, a second handle, and two blades. The upper end of the first handle is eccentrically connected to the drive gear, and the upper end of the second handle is eccentrically connected to the driven gear. The middle portions of the first handle and the second handle are hinged together. The lower ends of the first handle and the second handle are respectively connected to one of the blades. The two blades can extend below the nozzle and can swing towards each other or away from each other under the drive of the drive gear and the driven gear, and can cut the continuous fiber composite filaments extruded from the nozzle.

8. The continuous fiber shearing device according to claim 7, characterized in that: The two blades are arranged at an angle, and the lower ends of the two blades are close to each other.

9. The continuous fiber shearing device according to claim 1, characterized in that: The driving element is a drive motor.

10. The continuous fiber shearing device according to claim 1, characterized in that: The driving element is electrically connected to a control element, which is used to control the opening, closing, forward and reverse rotation of the driving element.

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