A selective intermittent feeding device for continuous carbon fiber 3D printing

Abstract

The present invention discloses a selective intermittent feeding device for continuous carbon fiber 3D printing, which specifically relates to the field of 3D printing, including continuous carbon fiber and a print head; a fiber supply system, which includes a fiber reel and a guide component, and is used to store and guide the continuous carbon fiber. The continuous carbon fiber is unwound from the fiber reel and passes through the guide component to the print head to melt and realize continuous pulling out of the fiber; a feeding control system, which includes a driving mechanism and a transmission mechanism, and is used to feed the continuous carbon fiber into a forming area of ​​a 3D printer at a set speed and time; when the feeding is suspended during the 3D printing process, a monitoring module monitors the change in the motion state of the continuous carbon fiber and sends a signal to a controller, and the controller immediately activates a cutting component to quickly and accurately cut the continuous carbon fiber, thereby avoiding excessive supply of the continuous carbon fiber and possible confusion or entanglement problems.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and more specifically, to a selective intermittent feeding device for continuous carbon fiber 3D printing. Background Art

[0002] Additive manufacturing technology (3D printing) is different from traditional manufacturing models. It does not require molds, tools, and fixtures, and can quickly and accurately manufacture parts of any shape. It has been listed as a strategic development technology by major developed countries. It is now widely used in many fields such as automobile manufacturing, aerospace, military production, biomedicine, and sporting goods. 3D printing technology used in three-dimensional forming of carbon fiber composite materials can give full play to the advantages of 3D printing process and material performance, and efficiently and accurately manufacture lightweight, high-strength, heat-resistant and corrosion-resistant high-performance parts, which has broad prospects in the fields of aerospace, automobile manufacturing, etc.

[0003] The Chinese patent with the authorization announcement number CN111016161B discloses a selective intermittent feeding device for continuous carbon fiber 3D printing, comprising: a first guide wheel, a second guide wheel, a first driving mechanism, and a second driving mechanism, wherein one side of the outer circumference of the first guide wheel is arranged opposite to one side of the outer circumference of the second guide wheel, and the axis of the first guide wheel is parallel to the axis of the second guide wheel; the first driving mechanism can drive the first guide wheel / the second guide wheel to rotate; the second driving mechanism can drive the opposite surfaces of the first guide wheel and the second guide wheel to move closer to / away from each other, which can effectively avoid problems such as excessive feeding causing material accumulation or insufficient feeding causing material breakage due to speed mismatch between the feeding device and the printing nozzle;

[0004] In the existing 3D printing process of continuous fiber reinforced composite materials, in order to ensure the quality and strength of the printed products, the fiber supply needs to be precisely controlled. However, the traditional fiber supply method cannot automatically cut off the fiber when the feeding is paused without damaging the integrity and continuity of the fiber.

[0005] Therefore, it is particularly important to develop a device that can automatically cut the continuous fiber during non-printing periods. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a selective intermittent feeding device for continuous carbon fiber 3D printing, which monitors the changes in the continuous carbon fiber feeding speed through a monitoring module and sends a signal to a controller, and the controller then activates the cutting component to cut the continuous fiber quickly and accurately, thereby avoiding excessive supply of continuous carbon fiber and possible confusion or entanglement problems, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a selective intermittent feeding device for continuous carbon fiber 3D printing, comprising: a continuous carbon fiber and a printing head;

[0008] A fiber supply system, which includes a fiber reel and a guide assembly, for storing and guiding continuous carbon fibers, wherein the continuous carbon fibers are unwound from the fiber reel and pass through the guide assembly to the print head for melting to realize continuous fiber pulling;

[0009] A feed control system, which includes a drive mechanism and a transmission mechanism, for feeding the continuous carbon fiber into the forming area of ​​the 3D printer at a set speed and time;

[0010] An automatic cutting system is arranged at the outlet of the fiber supply system and connected to the feeding control system. The automatic cutting system includes a monitoring module, a controller and a cutting assembly. The monitoring module is used to monitor the feeding status of the continuous carbon fiber in real time and send a signal to the controller. The controller receives the signal from the monitoring module and decides whether to start the cutting assembly according to the real-time monitoring status of the continuous carbon fiber in the monitoring module.

[0011] Among them, the transmission mechanism includes a first transmission member and a second transmission member, the first transmission member is driven by the driving mechanism to rotate and thus push the continuous carbon fiber to the throat direction of the print head, the second transmission member is driven by the first transmission member to rotate and thus push the continuous carbon fiber to the direction of the first transmission member, and the first transmission member and the second transmission member push the continuous carbon fiber to the same distance.

[0012] Preferably, a box structure is fixed on the surface of the guide assembly, and the box structure is a left and right split structure. A group of telescopic plates are fixed between the box structures arranged in the left and right split structures, and the telescopic plates are used to merge the box structures of the left and right split structures into one. The box structure includes a front box and a rear box, the front box covers the second transmission member, and the rear box wraps the first transmission member.

[0013] Preferably, the front box body is arranged as a semi-sealed box body with its opening facing upward, and the rear box body is arranged as a fully sealed box body, the front box body comprises a front left half box and a front right half box, the rear box body comprises a rear left half box, a rear right half box and a rear box cover covering the top ends of the rear left half box and the rear right half box, the front left half box and the rear left half box are fixed to each other, the front right half box and the rear right half box are fixed to each other, and a group of inner grooves for hiding the telescopic plate are provided on the rear walls of the front left half box and the front right half box.

[0014] Preferably, two groups of symmetrical bending plates are fixed at the opening of the front box body, and the monitoring module and the cutting assembly are respectively installed on the two groups of symmetrical bending plates. The cutting assembly includes a servo motor, a connecting rod and a laser cutting machine. One end of the connecting rod passes through the bending plate and is sleeved on the end of the output shaft of the servo motor. The other end of the connecting rod is fixed to the tail of the laser cutting machine. The laser head of the laser cutting machine is facing the continuous carbon fiber.

[0015] Preferably, the monitoring module comprises a row of high-precision cameras and a control unit parallel to the running track of the cutting assembly, the high-precision cameras capture the movement state and the incision of the continuous carbon fiber in real time, and the control unit is used to record and store the real-time monitoring of the high-precision cameras.

[0016] Preferably, the bending plate is composed of two vertical plates perpendicular to each other, and the laser beam emitted by the laser cutting machine cuts the continuous carbon fiber and is received by the bending plate far away from the laser cutting machine. The laser cutting machine cuts the continuous carbon fiber at 45°.

[0017] Preferably, the transmission mechanism comprises a first transmission member and two rollers, the first transmission member comprises two groups of longitudinal transmission members and a ring gear, the two rollers are inserted into the two groups of longitudinal transmission members and fixed to the two groups of longitudinal transmission members, and the ring gear is sleeved on a group of rollers away from the driving mechanism;

[0018] The longitudinal transmission member includes a first driving gear and a second meshing gear. The two first driving gears in the two sets of longitudinal transmission members rotate in opposite directions to transmit the continuous carbon fibers.

[0019] Preferably, the transmission mechanism also includes two groups of second transmission members, the two groups of second transmission members are fixed to the ends of the two groups of rollers passing through the two groups of longitudinal transmission members, the second transmission members include a connecting column, a helical gear group fixed to the surface of the connecting column, and a long cylindrical gear inserted into the inside of the helical gear group.

[0020] Preferably, the second transmission member further comprises a second driving gear fixed to the top end of the long cylindrical gear, and the two second driving gears located in the two groups of the second transmission members clamp and drive the continuous carbon fiber to move.

[0021] Preferably, the fiber reel includes a winding drum, an installation groove is located inside the winding drum, a group of worms are laterally inserted into the installation groove and fixed thereto, a group of sleeves are spirally arranged on the surface of the worm, and a group of springs are provided on the outer wall of the sleeve, one end of the spring is fixed to the end of the sleeve, and the other end extends into the installation groove and is fixed to the inner wall of the winding drum.

[0022] Technical effects and advantages of the present invention:

[0023] 1. When the feeding is paused during the 3D printing process, the monitoring module monitors the change in the motion state of the continuous carbon fiber and sends a signal to the controller, which then activates the cutting component to quickly and accurately cut the continuous carbon fiber, thereby avoiding excessive supply of continuous carbon fiber and possible confusion or entanglement problems;

[0024] 2. The split box structure can change the distance between the front left half box and the front right half box, and then change the distance between the rear left half box and the rear right half box, between the second transmission members and between the first transmission members, and clamp the continuous carbon fiber through two variable first drive gears and two second drive gears to limit the running track of the continuous carbon fiber;

[0025] The transmission mechanism includes a first transmission member and a second transmission member. The first transmission member is driven by the driving mechanism to rotate and then push the continuous carbon fiber to the throat direction of the print head. The second transmission member is driven by the first transmission member to rotate and then push the continuous carbon fiber to the direction of the first transmission member. The first transmission member and the second transmission member push the continuous carbon fiber to the same distance, thereby ensuring the continuous feeding and movement of the continuous carbon fiber.

[0026] When the continuous carbon fiber is unwound from the surface of the winding drum, the winding drum makes a spiral motion relative to the sleeve, and the sleeve gradually spirals out from the inside of the winding drum. The spring is in a stretched state. Due to the reaction force generated when the spring is stretched, the sleeve tends to move toward the inside of the winding drum, causing the continuous carbon fiber to be tensioned, preventing the continuous carbon fiber from being over-supplied and chaotic. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the selective intermittent feeding device for continuous carbon fiber 3D printing;

[0028] Figure 2 It is an exploded view of the box structure and guide assembly assembly structure of the present invention;

[0029] Figure 3 A cross-sectional view of the fiber reel structure of the present invention;

[0030] Figure 4 It is a partial structural schematic diagram of a selective intermittent feeding device for continuous carbon fiber 3D printing;

[0031] Figure 5 For the present invention Figure 4 A magnified view of the structure at A;

[0032] Figure 6 A partial structural exploded view of a selective intermittent feeding device for continuous carbon fiber 3D printing;

[0033] Figure 7A partial structural diagram of a selective intermittent feeding device for continuous carbon fiber 3D printing;

[0034] Figure 8 A partial structural axonometric view of the selective intermittent feeding device for continuous carbon fiber 3D printing;

[0035] Fig. 9 For the present invention Figure 8 A magnified view of the structure at B;

[0036] Fig.10 For the present invention Figure 8 Enlarged view of the structure at part C.

[0037] The accompanying drawings are marked as follows: 1. box structure; 101. rear box cover; 102. front left half box; 103. front right half box; 104. rear left half box; 105. rear right half box; 106. bending plate; 107. inner groove; 108. telescopic plate; 2. guide assembly; 201. lower lead drum; 202. lower half lead drum; 203. upper half lead drum; 3. fiber reel; 301. winding drum; 302. sleeve; 303. spring; 304. worm; 305. mounting groove; 4. continuous carbon fiber; 5. Print head; 6. Driving mechanism; 601. Motor; 602. Base plate; 603. Column gear; 7. Feed nozzle; 8. Transmission mechanism; 810. First transmission member; 811. First drive gear; 812. Second meshing gear; 813. Ring gear; 820. Roller; 830. Second transmission member; 831. Connecting column; 832. Helical gear set; 833. Connecting rod sleeve; 834. Long column gear; 835. Second drive gear; 9. Monitoring module; 10. Cutting assembly. DETAILED DESCRIPTION

[0038] 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Refer to the instruction manual Figure 1-Figure 10 :

[0040] A selective intermittent feeding device for continuous carbon fiber 3D printing, comprising a continuous carbon fiber 4, a print head 5, a fiber supply system, a feeding control system and an automatic cutting system: the fiber supply system, which comprises a fiber reel 3 and a guide assembly 2, is used to store and guide the continuous carbon fiber 4, the continuous carbon fiber 4 is unwound from the fiber reel 3 and passes through the guide assembly 2 to the print head 5 for melting to realize continuous pulling of the fiber; the feeding control system, which comprises a driving mechanism 6 and a transmission mechanism 8, is used to feed the continuous carbon fiber 4 into the forming area of ​​the 3D printer according to the set speed and time;

[0041] An automatic cutting system is arranged at the outlet of the fiber supply system and is connected to the feed control system. The automatic cutting system includes a monitoring module 9, a controller and a cutting assembly 10. The monitoring module 9 is used to monitor the feeding status of the continuous carbon fiber 4 in real time and send a signal to the controller. The controller receives the signal from the monitoring module 9 and decides whether to start the cutting assembly 10 according to the real-time monitoring status of the continuous carbon fiber 4 in the monitoring module 9.

[0042] Among them, the transmission mechanism 8 includes a first transmission member 810 and a second transmission member 830. The first transmission member 810 is driven by the driving mechanism 6 to rotate and then push the continuous carbon fiber 4 to the throat direction of the print head 5. The second transmission member 830 is driven by the first transmission member 810 to rotate and then push the continuous carbon fiber 4 to the direction of the first transmission member 810. The first transmission member 810 and the second transmission member 830 push the continuous carbon fiber 4 at the same distance. Only when the first transmission member 810 and the second transmission member 830 push the continuous carbon fiber 4 at the same distance can the motion state of the continuous carbon fiber 4 between the first transmission member 810 and the second transmission member 830 remain unchanged.

[0043] Specifically, Figure 2 and Figure 4 As shown, a box structure 1 is fixed on the exterior of the guide assembly 2, and the box structure 1 is a left-right split structure. A group of telescopic plates 108 are fixed between the box structures 1 arranged in the left-right split structure, and the telescopic plates 108 are used to merge the left-right split box structures 1 into one. The box structure 1 includes a front box and a rear box, and the front box covers the second transmission member 830, and the rear box wraps the first transmission member 810. The volume inside the box structure 1 can be changed by stretching.

[0044] Specifically, Figure 3As shown, the front box body is a semi-sealed box body with the mouth facing upward, and the rear box body is a fully sealed box body. The front box body includes a front left half box 102 and a front right half box 103, and the rear box body includes a rear left half box 104, a rear right half box 105, and a rear box cover 101 covering the top of the rear left half box 104 and the rear right half box 105. The front left half box 102 and the rear left half box 104 are fixed, and the front right half box 103 and the rear right half box 105 are fixed. A set of telescopic plates 10 are opened on the rear walls of the front left half box 102 and the front right half box 103. 8 The hidden inner groove 107, the split box structure 1 can change the distance between the front left half box 102 and the front right half box 103, the distance between the rear left half box 104 and the rear right half box 105, the distance between the two sets of second transmission members 830, the roller 820 and the first transmission member 810 is variable, the distance between the two first driving gears 811 and the two second driving gears 835 is variable, and the clamping function of the continuous carbon fiber 4 is realized by the two variable first driving gears 811 and the two second driving gears 835.

[0045] Reference Figure 2 As shown, the guide assembly 2 includes a lower lead barrel 201 fixed to the bottom end of the rear left half box 104 and a lower lead barrel 201 arranged in the rear box body, the lower lead barrel 201 includes a lower half lead barrel 202 and an upper half lead barrel 203, the lower half lead barrel 202 is fixed to the bottom end of the rear left half box 104, and the upper half lead barrel 203 is fixed to the surface of the rear box cover 101, when the rear box cover 101 is covered on the rear left half box 104 and the rear right half box 105, the lower half lead barrel 202 and the upper half lead barrel 203 are completely fitted, leaving a channel for the continuous carbon fiber 4 to slide, and the guide assembly 2 guides the continuous carbon fiber 4 to pass through the rear box body and vertically extend into the front box body, and at the same time, the continuous carbon fiber 4 is vertically inserted into the feed nozzle 7 under the guidance of the guide assembly 2;

[0046] Specifically, Figure 5 As shown, two groups of symmetrical bending plates 106 are fixed at the opening of the front box body, and the monitoring module 9 and the cutting assembly 10 are respectively installed on the two groups of symmetrical bending plates 106. The cutting assembly 10 includes a servo motor 1, a connecting rod and a laser cutting machine. One end of the connecting rod passes through the bending plate 106 and is sleeved on the end of the output shaft of the servo motor 1. The other end of the connecting rod is fixed to the tail of the laser cutting machine, and the laser head of the laser cutting machine is facing the continuous carbon fiber 4.

[0047] There are two groups of controllers. One group of controllers is fixed on the housing of a servo motor. The controller controls the start and stop of the servo motor and the linear displacement of the output shaft. The output shaft of the servo motor is quickly displaced to enable the laser cutting machine to quickly cut the continuous carbon fiber 4. The other group of controllers is fixed on the housing of the laser cutting machine. The controller receives the signal of the inspection and monitoring module 9 and triggers the laser cutting machine to realize the cutting function, and quickly and accurately cuts the continuous carbon fiber 4. The cutting mechanism is driven by the servo motor to ensure the accuracy and repeatability of the cutting action.

[0048] The use of laser cutting ensures damage-free cutting technology. Laser cutting ensures that the cutting is completed without contacting the material, thereby protecting the integrity of the fiber. At the same time, the incision of laser cutting is very fine to ensure that no additional damage is caused to the fiber when it is cut.

[0049] Specifically, Figure 5 As shown, the monitoring module 9 includes a row of high-precision cameras and a control unit parallel to the running track of the cutting assembly. The high-precision cameras capture the motion state of the continuous carbon fiber 4 and the incision of the continuous carbon fiber 4 in real time, and the control unit is used to record and store the real-time monitoring data of the high-precision cameras; the real-time monitoring data is the motion state of the continuous carbon fiber 4 and the incision of the continuous carbon fiber 4;

[0050] The control unit, controller 1, controller 2 and a high-precision camera form a feedback control system, which is tightly integrated with the control system of the 3D printer and is used to monitor the status of the continuous carbon fiber 4 in real time. The feedback control system is used to monitor the operating status of the continuous carbon fiber 4 in real time, store the status of the continuous carbon fiber 4, output instructions and trigger it, and then feedback and adjust the cutting action according to the real-time monitoring of the high-precision camera to ensure that each cutting is accurate and error-free.

[0051] Specifically, Figure 5 As shown, the bending plate 106 is composed of two vertical plates perpendicular to each other. The laser beam emitted by the laser cutting machine cuts the continuous carbon fiber 4 and is received by the bending plate 106 far away from the laser cutting machine. The laser cutting machine cuts the continuous carbon fiber 4 at a 45° angle.

[0052] Specifically, Figure 6-Figure 10 As shown, the transmission mechanism 8 includes a first transmission member 810 and two rollers 820. The first transmission member 810 includes two groups of longitudinal transmission members and a ring gear 813. The two rollers 820 are inserted into the two groups of longitudinal transmission members and fixed to the two groups of longitudinal transmission members. The ring gear 813 is sleeved on a group of rollers 820 away from the driving mechanism 6.

[0053] The longitudinal transmission member includes a first driving gear 811 and a second meshing gear 812 . The two first driving gears 811 in the two sets of longitudinal transmission members rotate in opposite directions to transmit the continuous carbon fibers 4 .

[0054] Specifically, the driving mechanism 6 includes a motor 601 and a cylindrical gear 603, the cylindrical gear 603 is fixed to the end of the output shaft of the motor 601, and a group of substrates 602 are provided on the surface of the motor 601, and the substrate 602 is used to fix the position of the motor 601, and the substrate 602 is fixed to the front right half box 103 to fix itself; the ring gear 813 is driven to rotate by the cylindrical gear 603, thereby driving the roller 820 fixed to the ring gear 813 to rotate, and the second meshing gear 812 fixed to the surface of the rotating roller 820 rotates accordingly, the two second meshing gears 812 are meshed, and the two second meshing gears 812 rotate in the opposite direction, and the two rollers 820 fixed to the two second meshing gears 812 rotate in the opposite direction accordingly, and the two first driving gears 811 rotate in the opposite direction accordingly, and the two first driving gears 811 rotating in the opposite direction transmit the continuous carbon fiber 4 to the throat of the print head 5 progressively.

[0055] The transmission mechanism 8 also includes two groups of second transmission members 830, which are fixed to the ends of the two groups of rollers 820 passing through the two groups of longitudinal transmission members. The second transmission member 830 includes a connecting column 831, a helical gear set 832 fixed to the surface of the connecting column 831, and a long cylindrical gear 834 inserted into the inside of the helical gear set 832.

[0056] Specifically, the helical gear set 832 is composed of two sets of bevel gears that are perpendicular to each other and mesh with each other. A set of bevel gears in a vertical state meshes with the connecting column 831, and a set of fixed columns are inserted in the center of a set of bevel gears in a horizontal state. The fixed columns are fixed on the surface wall of the rear left half box 104. The surface of the long column gear 834 is connected to a connecting rod sleeve 833, and its position is fixed by the connecting rod sleeve 833 and the fixed column. At the same time, the long column gear 834 meshes with a set of bevel gears in a horizontal state.

[0057] Specifically, the second transmission member 830 further includes a second driving gear 835 fixed to the top of the long cylindrical gear 834 . The two second driving gears 835 located in the two groups of second transmission members 830 clamp and drive the continuous carbon fiber 4 to move.

[0058] Specifically, in order to realize the precise cutting of the continuous carbon fiber 4, it is required to limit the position running track of the continuous carbon fiber 4, that is, it is necessary to set a clamping device. The clamping device in the present invention is composed of the first transmission member 810, the second transmission member 830 and the second transmission member 830. No additional mechanism is added, which makes the structure of the feeding device complicated, and realizes the dual function of the transmission mechanism 8;

[0059] First, the continuous carbon fiber 4 needs to have a fine and precise cut during the cutting process, and the continuous carbon fiber 4 is required to be always in a straight state, that is, the first transmission member 810 and the second transmission member 830 push the continuous carbon fiber 4 to the same distance, the diameter of the second driving gear 835 of the device is half the diameter of the first driving gear 811, the meshing ratio of the two sets of bevel gears of the helical gear set 832 is 1:1, the meshing ratio of the bevel gear and the long cylindrical gear 834 is 1:2, and the long cylindrical gear 834 and the second driving gear 835 have the same running speed, that is, the meshing ratio of the first driving gear 811 and the second driving gear 835 is 1:2;

[0060] It should be noted that the first driving gear 811 and the second meshing gear 812 in the two sets of first transmission members 810 are consistent in size and structure.

[0061] Specifically, Figure 3 As shown, the fiber reel 3 includes a winding drum 301, and an installation groove 305 is located inside the winding drum 301. A group of worms 304 are horizontally inserted into the installation groove 305 and fixed thereto. A group of sleeves 302 are spirally arranged on the surface of the worm 304. A group of springs 303 are provided on the outer wall of the sleeve 302. One end of the spring 303 is fixed to the end of the sleeve 302, and the other end extends into the installation groove 305 and is fixed to the inner wall of the winding drum 301.

[0062] Specifically, when the continuous carbon fiber 4 is unwound from the surface of the winding drum 301, the winding drum 301 makes a spiral motion relative to the sleeve 302, and the sleeve 302 gradually spirals out from the interior of the winding drum 301. The spring 303 is in a stretched state. Due to the reaction force generated when the spring 303 is stretched, the sleeve 302 tends to move toward the interior of the winding drum 301, so that the continuous carbon fiber 4 unwound from the surface of the winding drum 301 tends to be rolled up, thereby causing the continuous carbon fiber 4 to be in a straightened state.

[0063] Working principle: The continuous carbon fiber 4 is pulled from the surface of the winding drum 301, and the sleeve 302 is spirally extended from the inside of the winding drum 301, and the spring 303 is stretched. The stretched spring 303 produces a reaction, causing the sleeve 302 to have a tendency to move toward the inside of the winding drum 301, so that the continuous carbon fiber 4 released from the surface of the winding drum 301 has a tendency to reel up, and the continuous carbon fiber 4 is tensioned;

[0064] Press the opening of the front box body and pull it, so that the front left half box 102 moves relative to the front right half box 103, and the rear left half box 104 moves relative to the rear right half box 105, the distance between the two sets of second transmission members 830, the roller 820 and the first transmission member 810 increases, and the distance between the two first driving gears 811 and the two second driving gears 835 increases;

[0065] The continuous carbon fiber 4 is passed through the lower lead barrel 201, between the two second drive gears 835, the lower half lead barrel 202, the feed nozzle 7, the two first drive gears 811 and finally into the throat of the print head 5. Due to the reaction force of the spring 303, the continuous carbon fiber 4 is always tensioned;

[0066] Relax the hand movement, and use the elastic force of the telescopic plate 108 to cause the front left half box 102 and the front right half box 103 to merge into one, and the rear left half box 104 and the rear right half box 105 to merge into one, and the distance between the two first drive gears 811 and the two second drive gears 835 is reduced, and the two first drive gears 811 and the two second drive gears 835 firmly clamp the continuous carbon fiber 4, and finally cover the rear box cover 101 on the top of the rear left half box 104 and the rear right half box 105, wherein the rear box cover 101 is clamped with the rear left half box 104 and the rear right half box 105, and the rear box cover 101 is used to tighten the assembled box structure 1 again, and at the same time, the tightening force of the rear box cover 101 is used to ensure that the second transmission member 830 and the first transmission member 810 are used as clamping members;

[0067] The control system of the 3D printer can calculate the required length of the continuous carbon fiber 4 according to the printed 3D object, automatically or manually set the length of the continuous carbon fiber 4 and the instantaneous speed of cutting the continuous carbon fiber 4, change the running speed of the continuous carbon fiber 4, and calculate the time for the continuous carbon fiber 4 to reach the forming area of ​​the 3D printer, and automatically perform related operations to reduce the need for human intervention;

[0068] Start the switch of the selective intermittent feeding device for continuous carbon fiber 3D printing, and the control system of the 3D printer runs according to the preset running speed of the continuous carbon fiber 4, wherein the control system of the 3D printer controls the driving mechanism 6 to drive, and calculates the time for the continuous carbon fiber 4 to be transported from the winding drum 301 to the forming area of ​​the 3D printer according to the running speed of the continuous carbon fiber 4 to instantaneously reduce the running speed of the continuous carbon fiber 4, and the feedback control system monitors the movement state of the continuous carbon fiber 4 in real time and sends instructions to the controller according to the movement state of the continuous carbon fiber 4, and the controller receives the signal of the monitoring module 9, and the controller starts the cutting assembly 10 to cut the continuous carbon fiber 4, and the feedback control system monitors in real time and generates the cutting action in time to ensure that each cutting is accurate and error-free.

[0069] When the feeding is paused during the 3D printing process, the movement state of the continuous carbon fiber 4 changes, the monitoring module 9 will sense the change in the feeding speed of the continuous carbon fiber 4 and send a signal to the controller, and the controller will then activate the cutting component 10 to cut the continuous carbon fiber 4 quickly and accurately, thereby avoiding excessive supply of the continuous carbon fiber 4 and possible confusion or entanglement problems.

[0070] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0071] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0072] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A selective intermittent feeding device for continuous carbon fiber 3D printing, characterized in that: include: Continuous carbon fiber (4) and a printing head (5); A fiber supply system, comprising a fiber reel (3) and a guide assembly (2), for storing and guiding continuous carbon fibers (4), wherein the continuous carbon fibers (4) are unwound from the fiber reel (3) and pass through the guide assembly (2) to a print head (5) for melting to achieve continuous fiber pulling; A feed control system, comprising a drive mechanism (6) and a transmission mechanism (8), for feeding the continuous carbon fiber (4) into a forming area of ​​the 3D printer at a set speed and time; An automatic cutting system, which is arranged at the outlet end of the fiber supply system and connected to the feed control system, the automatic cutting system comprising a monitoring module (9), a controller and a cutting assembly (10), the monitoring module (9) being used to monitor the feeding status of the continuous carbon fiber (4) in real time and send a signal to the controller, the controller receiving the signal from the monitoring module (9) and determining whether to start the cutting assembly (10) according to the real-time monitoring status of the continuous carbon fiber (4) in the monitoring module (9); The transmission mechanism (8) comprises a first transmission member (810) and a second transmission member (830); the first transmission member (810) is driven by the driving mechanism (6) to rotate and thereby push the continuous carbon fiber (4) to the throat direction of the print head (5); the second transmission member (830) is driven by the first transmission member (810) to rotate and thereby push the continuous carbon fiber (4) to the direction of the first transmission member (810); the first transmission member (810) and the second transmission member (830) push the continuous carbon fiber (4) to the same distance; A box structure (1) is fixed on the outer surface of the guide assembly (2), the box structure (1) being a left-right split structure, a group of telescopic plates (108) being fixed between the left and right sides of the box structure (1) being arranged in the left-right split structure, and the box structures (1) of the left-right split structure are combined into one body by means of the telescopic plates (108), the box structure (1) comprising a front box and a rear box, the front box covering the second transmission member (830), and the rear box wrapping the first transmission member (810); The front box body is a semi-sealed box body with an opening facing upward, and the rear box body is a fully sealed box body. The front box body includes a front left half box (102) and a front right half box (103), and the rear box body includes a rear left half box (104), a rear right half box (105), and a rear box cover (101) covering the top of the rear left half box (104) and the rear right half box (105). The front left half box (102) and the rear left half box (104) are fixed to each other, and the front right half box (103) and the rear right half box (105) are fixed to each other. 105) are fixed to each other, a group of inner grooves (107) for hiding the telescopic plate (108) are opened on the rear walls of the front left half box (102) and the front right half box (103), the split box structure (1) can change the distance between the front left half box (102) and the front right half box (103), the distance between the rear left half box (104) and the rear right half box (105), and the distance between the two groups of the second transmission members (830), the roller (820) and the first transmission member (810) can be changed; The first transmission member (810) comprises two groups of longitudinal transmission members, the longitudinal transmission members comprising a first driving gear (811) and a second meshing gear (812), the two first driving gears (811) in the two groups of longitudinal transmission members rotate in opposite directions to transmit the continuous carbon fiber (4), the second transmission member (830) further comprises a second driving gear (835), the two second driving gears (835) located in the two groups of the second transmission members (830) clamp and drive the continuous carbon fiber (4) to move, the distance between the two first driving gears (811) and the two second driving gears (835) is variable, and the continuous carbon fiber (4) is clamped by the two variable first driving gears (811) and the two second driving gears (835).

2. A selective intermittent feeding device for continuous carbon fiber 3D printing according to claim 1, characterized in that: Two groups of symmetrical bending plates (106) are fixed at the opening of the front box body, and the monitoring module (9) and the cutting assembly (10) are respectively installed on the two groups of symmetrical bending plates (106). The cutting assembly (10) includes a servo motor, a connecting rod and a laser cutting machine. One end of the connecting rod passes through the bending plate (106) and is sleeved on the end of the output shaft of the servo motor. The other end of the connecting rod is fixed to the tail of the laser cutting machine. The laser head of the laser cutting machine is facing the continuous carbon fiber (4).

3. A selective intermittent feeding device for continuous carbon fiber 3D printing according to claim 2, characterized in that: The monitoring module (9) comprises a row of high-precision cameras parallel to the running track of the cutting assembly (10) and a control unit, wherein the high-precision cameras capture the movement state of the continuous carbon fiber (4) and the cut of the continuous carbon fiber (4) in real time, and the control unit is used to record and store the real-time monitoring data of the high-precision cameras.

4. A selective intermittent feeding device for continuous carbon fiber 3D printing according to claim 3, characterized in that: The bending plate (106) is composed of two vertical plates perpendicular to each other. The laser beam emitted by the laser cutting machine cuts the continuous carbon fiber (4) and is then received by the bending plate (106) away from the laser cutting machine. The laser cutting machine cuts the continuous carbon fiber (4) at a 45° angle.

5. A selective intermittent feeding device for continuous carbon fiber 3D printing according to claim 4, characterized in that: The transmission mechanism (8) comprises a first transmission member (810) and two rollers (820), wherein the first transmission member (810) comprises a ring gear (813), the two rollers (820) are inserted into and fixed to two groups of longitudinal transmission members, and the ring gear (813) is sleeved on a group of rollers (820) away from the driving mechanism (6).

6. A selective intermittent feeding device for continuous carbon fiber 3D printing according to claim 5, characterized in that: The transmission mechanism (8) further comprises two groups of second transmission members (830), the two groups of second transmission members (830) being fixed to the ends of the two groups of rotating rollers (820) passing through the two groups of longitudinal transmission members, the second transmission member (830) comprising a connecting column (831), a helical gear set (832) fixed to the surface of the connecting column (831), and a long cylindrical gear (834) inserted into the interior of the helical gear set (832).

7. A selective intermittent feeding device for continuous carbon fiber 3D printing according to claim 6, characterized in that: The fiber reel (3) comprises a winding drum (301), a mounting groove (305) is provided inside the winding drum (301), a group of worms (304) are inserted transversely inside the mounting groove (305) and are fixed thereto, a group of sleeves (302) are spirally provided on the surface of the worms (304), and a group of springs (303) are provided on the outer wall of the sleeves (302), one end of the springs (303) is fixed to the end of the sleeves (302), and the other end extends into the mounting groove (305) and is fixed to the inner wall of the winding drum (301).

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