3D printing material conveying and spraying device and 3D printing equipment

Abstract

The utility model relates to the technical field of 3D printing, and particularly discloses a 3D printing material conveying and spraying device and 3D printing equipment, the device comprises a base, a driving mechanism, a first feeding mechanism, a second feeding mechanism, a heating mechanism and a nozzle, the driving mechanism comprises a driving piece and a driving wheel which are in transmission connection, the first feeding mechanism comprises a first conveying roller set and a first transmission wheel which are in transmission connection, the first conveying roller set is rotationally connected with the base, and the first transmission wheel is in transmission connection with the driving wheel. The second feeding mechanism comprises a second conveying roller set and a second transmission wheel which are in transmission connection, the second conveying roller set is rotationally connected with the base, and the second transmission wheel is in transmission connection with the driving wheel. A first feeding port of the heating mechanism can be communicated with an outlet of the first conveying roller set, a second feeding port of the heating mechanism can be communicated with an outlet of the second conveying roller set, the heating mechanism is driven by the same driving mechanism, it is guaranteed that different wires are synchronously fed according to the preset speed ratio, and stable control over the volume proportion of the different wires in the composite is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a 3D printing material feeding and spraying device and a 3D printing device. Background Art

[0002] 3D printing adopts the principle of layer-by-layer stacking, divides complex three-dimensional parts into multiple two-dimensional planes, and forms different corresponding plane printing paths. Continuous fiber composite materials have the characteristics of light weight and high strength, and have been widely used in the fields of aerospace, automobile manufacturing, etc.

[0003] In the related art, in the research on the 3D printing process of composite materials such as continuous fiber composite materials, it is necessary to integrate 3D printing equipment that meets the requirements of process research. However, the filaments of fibers and resins are generally transported separately by multiple conveying mechanisms, and it is difficult to continuously transport and pause. It is difficult to stably control the ratio of the two filaments of fiber and resin, and the fiber volume ratio is prone to errors. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a 3D printing material feeding and spraying device and a 3D printing device, so as to solve the problems in the related art that different filaments in the 3D printing of composite materials need to be transported separately by different devices, and the volume ratio of different filaments in the composite materials is not easy to stably control and is prone to errors.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, the utility model provides a 3D printing material feeding and spraying device, including:

[0007] A base;

[0008] A driving mechanism, the driving mechanism is arranged on the base, the driving mechanism includes a driving part and a driving wheel that are in transmission connection, and the driving part can drive the driving wheel to rotate;

[0009] A first feeding mechanism, including a first conveying roller group and a first driving wheel that are in transmission connection, the first conveying roller group is rotatably connected to the base, and the first driving wheel is in transmission connection with the driving wheel;

[0010] A second feeding mechanism, including a second conveying roller group and a second driving wheel that are in transmission connection, the second conveying roller group is rotatably connected to the base, and the second driving wheel is in transmission connection with the driving wheel;

[0011] A heating mechanism, having a first feeding port, a second feeding port and a discharging port, the first feeding port can be communicated with the outlet of the first conveying roller group, and the second feeding port can be communicated with the outlet of the second conveying roller group;

[0012] A nozzle that can communicate with the discharge port.

[0013] In some embodiments, the drive wheel is detachably connected to the drive member, and / or the first transmission wheel is detachably connected to the first conveying roller set, and / or the second transmission wheel is detachably connected to the second conveying roller set.

[0014] In some embodiments, the first conveying roller set includes a first roller body and a second roller body rotatably connected to the base. There is a gap between the first roller body and the second roller body to form a first conveying channel, and one of the first roller body and the second roller body is fixedly connected to the first transmission wheel.

[0015] In some embodiments, the second conveying roller set includes a third roller body and a fourth roller body rotatably connected to the base. There is a gap between the third roller body and the fourth roller body to form a second conveying channel, and one of the third roller body and the fourth roller body is fixedly connected to the second transmission wheel.

[0016] In some embodiments, one of the first roller body and the second roller body connected to the first transmission wheel is configured as a gear structure, and / or one of the third roller body and the fourth roller body connected to the second transmission wheel is configured as a gear structure.

[0017] In some embodiments, the first feeding mechanism further includes a first conduit connected to the base. The first conduit is disposed at the inlet and / or outlet of the first conveying roller set; and / or

[0018] The second feeding mechanism further includes a second conduit connected to the base. The second conduit is disposed at the inlet and / or outlet of the second conveying roller set.

[0019] In some embodiments, the first feeding mechanism further includes a first throat and a first heat sink. The first heat sink is disposed on the outer circumference of the first throat. The first throat is connected to the base, and the first throat can communicate with the outlet of the first conveying roller set; and / or

[0020] The second feeding mechanism further includes a second throat and a second heat sink. The second heat sink is disposed on the outer circumference of the second throat. The second throat is connected to the base, and the second throat can communicate with the outlet of the second conveying roller set.

[0021] In some embodiments, the 3D printing material feeding and spraying device further includes an adjusting mechanism disposed on one side of the first conveying roller set, and / or the adjusting mechanism is disposed on one side of the second conveying roller set;

[0022] Among them, the adjusting mechanism includes a swing arm, a bolt and an elastic member. One end of the swing arm is rotatably connected to the base, the other end of the swing arm is connected to the bolt, the tail of the bolt is threadedly connected to the base, the elastic member is abutted between the base and the swing arm, and the rotation of the bolt can drive the swing arm to approach or move away from the first conveying roller group or the second conveying roller group.

[0023] In some embodiments, the heating mechanism includes a connecting block, a thermocouple and a heating rod. A heating channel is arranged in the connecting block. The first feed port, the second feed port and the discharge port are all communicated with the heating channel. The heating rod is arranged in the heating channel. The thermocouple is used to detect the temperature in the heating channel, and the nozzle is connected to the connecting block.

[0024] In a second aspect, the present invention provides a 3D printing device, including the 3D printing material feeding and spraying device in any of the above solutions and a plurality of unwinding mechanisms. The outlet of the unwinding mechanism can be communicated with the inlet of the first conveying roller group or the second conveying roller group.

[0025] The beneficial effects of the present invention are as follows:

[0026] The present invention provides a 3D printing material feeding and spraying device and a 3D printing device. The first feeding mechanism and the second feeding mechanism of the 3D printing material feeding and spraying device can convey materials of different materials or different sizes. The first feeding mechanism and the second feeding mechanism can be provided with feeding power by the same driving mechanism. When the driving member drives the driving wheel to rotate forward, it can drive the first conveying roller group to rotate to feed the first material to the heating mechanism, and drive the second conveying roller group to rotate to feed the second material to the heating mechanism. When the driving member drives the driving wheel to rotate reversely, it can drive the first conveying roller group to rotate to draw back the first material, and drive the second conveying roller group to rotate to draw back the second material. The feeding and drawing-back operations are convenient, and it is also convenient for the synchronous feeding of the first material and the second material. The volume ratio is easy to stably control. Moreover, different transmission ratios can be designed between the driving wheel and the first transmission wheel and between the driving wheel and the second transmission wheel, so that different feeding speed ratios are obtained for the first conveying roller group and the second conveying roller group, and thus composite printing bodies with different volume ratios are obtained. Description of the Drawings

[0027] Figure 1 Structural schematic of the 3D printing material feeding and spraying device in the embodiment of the present invention Figure 1 ;

[0028] Figure 2 Structural schematic of the 3D printing material feeding and spraying device in the embodiment of the present invention Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the positions of the first conveying roller group and the second conveying roller group in the embodiments of the present utility model.

[0030] In the figure:

[0031] 1. Base; 12. Bracket;

[0032] 2. Driving mechanism; 21. Driving member; 22. Driving wheel;

[0033] 3. First feeding mechanism; 31. First conveying roller group; 311. First roller body; 312. Second roller body; 32. First transmission wheel; 33. First conduit; 34. First throat tube; 35. First heat sink;

[0034] 4. Second feeding mechanism; 41. Second conveying roller group; 411. Third roller body; 412. Fourth roller body; 42. Second transmission wheel; 43. Second conduit; 44. Second throat tube; 45. Second heat sink;

[0035] 5. Heating mechanism; 51. First feed inlet; 52. Second feed inlet; 53. Discharge outlet; 54. Connecting block; 55. Thermocouple; 56. Heating rod;

[0036] 6. Nozzle;

[0037] 7. Adjusting mechanism; 71. Swing arm; 72. Bolt; 73. Elastic member. Detailed implementation manners

[0038] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0039] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] As Figures 1 to 2 shown, an embodiment of the first aspect of the present utility model provides a 3D printing material feeding and spraying device, which includes a base 1, a driving mechanism 2, a first feeding mechanism 3, a second feeding mechanism 4, a heating mechanism 5 and a nozzle 6. The driving mechanism 2 is arranged on the base 1. The driving mechanism 2 includes a driving member 21 and a driving wheel 22 that are in transmission connection with each other. The driving member 21 can drive the driving wheel 22 to rotate.

[0043] The first feeding mechanism 3 includes a first conveying roller group 31 and a first driving wheel 32 that are in transmission connection with each other. The first conveying roller group 31 is rotatably connected to the base 1. The first driving wheel 32 is in transmission connection with the driving wheel 22. The first conveying roller group 31 can be used to convey the first material. When the driving wheel 22 rotates, it can drive the first driving wheel 32 to rotate. When the first driving wheel 32 rotates, it can drive the first conveying roller group 31 to rotate. The first material can be clamped between the first conveying roller group 31. The rotation of the first conveying roller group 31 can control the conveying length of the first material.

[0044] The second feeding mechanism 4 includes a second conveying roller group 41 and a second driving wheel 42 that are in transmission connection with each other. The second conveying roller group 41 is rotatably connected to the base 1. The second driving wheel 42 is in transmission connection with the driving wheel 22. The second conveying roller group 41 can be used to convey the second material. When the driving wheel 22 rotates, it can drive the second driving wheel 42 to rotate. When the second driving wheel rotates, it drives the second conveying roller group 41 to rotate. The second material can be clamped between the second conveying roller group 41. The rotation of the second conveying roller group 41 can control the conveying length of the second material.

[0045] The heating mechanism 5 has a first feed inlet 51, a second feed inlet 52 and a discharge outlet 53. The first feed inlet 51 can communicate with the outlet of the first conveying roller group 31, and the second feed inlet 52 can communicate with the outlet of the second conveying roller group 41. The nozzle 6 can communicate with the discharge outlet 53, so that the first material fed and conveyed by the first conveying roller group 31 can enter the first feed inlet 51, and the second material fed and conveyed by the second conveying roller group 41 can enter the second feed inlet 52. The heating mechanism 5 can heat and melt the first material and the second material and output them from the discharge outlet 53 and then enter the nozzle 6 for extrusion and spraying.

[0046] With such a setting, the first feeding mechanism 3 and the second feeding mechanism 4 of this embodiment can convey materials of different materials or different sizes. The first feeding mechanism 3 and the second feeding mechanism 4 can be provided with feeding power by the same driving mechanism 2. When the driving member 21 drives the driving wheel 22 to rotate forward, it can drive the first conveying roller group 31 to rotate to feed the first material to the heating mechanism 5, and drive the second conveying roller group 41 to rotate to feed the second material to the heating mechanism 5. When the driving member 21 drives the driving wheel 22 to rotate reversely, it can drive the first conveying roller group 31 to rotate to withdraw the first material, and drive the second conveying roller group 41 to rotate to withdraw the second material. The feeding and withdrawing operations are convenient, and it is also convenient for the synchronous feeding of the first material and the second material. The volume ratio is easy to be stably controlled. Moreover, different transmission ratios can be designed between the driving wheel 22 and the first transmission wheel 32 and between the driving wheel 22 and the second transmission wheel 42, so that the first conveying roller group 31 and the second conveying roller group 41 obtain different feeding speed ratios, and then composite printed bodies with different volume ratios are obtained, solving the problem in the related art that different wire materials for composite 3D printing need to be conveyed by different devices respectively, and the volume ratio of different wire materials in the composite material is not easy to be stably controlled and errors are likely to occur.

[0047] In this embodiment, the continuous fiber composite 3D printing mainly has two processes: in-situ impregnation and pre-impregnated wire printing. The former has a short impregnation time, resulting in insufficient impregnation, while the latter has problems such as a fixed fiber volume fraction of the pre-impregnated fiber printed component and difficulty in dynamically adjusting according to actual needs. This embodiment can adjust the fiber volume ratio in the continuous fiber composite by adjusting the feeding of the wire material. When the 3D printing material feeding and spraying device is applied to process continuous fiber composites, the first material can be configured as a fiber wire material, such as a fiber pre-impregnated wire material, and the second material can be configured as a resin wire material.

[0048] Such as Figures 1 to 2As shown, in some embodiments, the driving wheel 22 is detachably connected to the driving member 21, and / or the first transmission wheel 32 is detachably connected to the first conveying roller set 31, and / or the second transmission wheel 42 is detachably connected to the second conveying roller set 41. The connections between the driving wheel 22 and the driving member 21, between the first transmission wheel 32 and the first conveying roller set 31, and between the second transmission wheel 42 and the second conveying roller set 41 can be, but are not limited to, bolt 72 connection, magnetic attraction connection, snap connection, bonding, or plug connection, as long as the driving wheel 22, the second transmission wheel 42, and the second transmission wheel 42 can be replaced to form different transmission ratios. For example, the driving wheel 22, the first transmission wheel 32, and the second transmission wheel 42 can all be configured as gear structures, and the rotational transmission is more accurate and easy to control. The transmission ratio can be adjusted by adjusting the radial dimension or the number of teeth of the wheel body. Alternatively, the driving wheel 22, the first transmission wheel 32, and the second transmission wheel 42 can also be configured as pulley wheels or sprocket wheels, and the transmission ratio can be adjusted by adjusting the radial dimension of the wheel body.

[0049] In this embodiment, one or more first feeding mechanisms 3 and second feeding mechanisms 4 are provided. The first transmission wheel 32 of each first feeding mechanism 3 and the second transmission wheel 42 of each second feeding mechanism 4 are both in transmission connection with the driving wheel 22. That is, multiple first feeding mechanisms 3 can be used to respectively convey multiple filaments of the first material, or can also be used to respectively convey materials of multiple materials. Similarly, multiple second feeding mechanisms 4 can be used to respectively convey multiple filaments of the second material, or can also be used to respectively convey materials of multiple materials, so as to form different forms of composite printed bodies.

[0050] As Figures 2 to 3 As shown, in some embodiments, the first conveying roller set 31 includes a first roller body 311 and a second roller body 312 that are rotatably connected to the base 1. There is a spacing between the first roller body 311 and the second roller body 312 to form a first conveying channel. The size of the first conveying channel can be smaller than the size of the first material. The first roller body 311 and the second roller body 312 can sandwich both sides of the first material. One of the first roller body 311 and the second roller body 312 is fixedly connected to the first transmission wheel 32. For example, the first rotating wheel can be fixed on the same rotating shaft by being fixedly connected to the first roller body 311 or the second roller body 312.

[0051] As Figures 2 to 3As shown, in some embodiments, the second conveying roller set 41 includes a third roller body 411 and a fourth roller body 412 rotatably connected to the base 1. There is a spacing between the third roller body 411 and the fourth roller body 412 to form a second conveying channel. The size of the second conveying channel can be smaller than the size of the second material. The third roller body 411 and the fourth roller body 412 can be clamped on both sides of the second material. One of the third roller body 411 and the fourth roller body 412 is fixedly connected to the second transmission wheel 42. Similarly, the second transmission wheel 42 can be fixed by being fixedly connected to the third roller body 411 or the fourth roller body 412 on the same rotating shaft.

[0052] As Figures 2 to 3 shown, in some embodiments, the one of the first roller body 311 and the second roller body 312 connected to the first transmission wheel 32 is configured as a gear structure, and / or the one of the third roller body 411 and the fourth roller body 412 connected to the second transmission wheel 42 is configured as a gear structure. By using the gear structure for feeding and conveying, it can ensure the reliable feeding of the wire material during the extrusion process of the pre-impregnated fiber wire or resin wire material.

[0053] In this embodiment, the first roller body 311 and the third roller body 411 can be configured as gear structures, and the second roller body 312 and the fourth roller body 412 are used to abut against the swing arm 71 of the adjusting mechanism 7.

[0054] As Figures 2 to 3 shown, in some embodiments, the first feeding mechanism 3 further includes a first conduit 33. The first conduit 33 is connected to the base 1 and is arranged at the inlet and / or outlet position of the first conveying roller set 31. The first guide roller can convey and guide the wire material at the inlet or outlet position of the first conveying roller set 31, reduce the curling of the wire material or its entanglement with other structures, make the wire material conveyance smooth and flat, and improve the feeding accuracy. Similarly, the second feeding mechanism 4 further includes a second conduit 43. The second conduit 43 is connected to the base 1 and is arranged at the inlet and / or outlet position of the second conveying roller set 41. The second conduit 43 can convey and guide the wire material at the inlet or outlet position of the second conveying roller set 41, reduce the curling of the wire material or its entanglement with other structures, and also make the wire material conveyance more smooth upstream and downstream of the second conveying roller set 41, improve the feeding accuracy, and further improve the volume ratio control accuracy of each material in the composite printed body.

[0055] As Figures 2 to 3As shown, in some embodiments, the first feeding mechanism 3 further includes a first throat 34 and a first heat sink 35. The first heat sink 35 is disposed on the outer circumference of the first throat 34. The first throat 34 is connected to the base 1, and the first throat 34 can communicate with the outlet of the first conveying roller group 31. After the wire of the first material is output from the outlet of the first conveying roller group 31, it can pass through the first throat 34 and then be conveyed into the heating mechanism 5. The first throat 34 is disposed close to the heating mechanism 5, which can not only convey and guide the first material, but also dissipate heat from the first material by providing the first heat sink 35, reducing the thermal deformation of the wire outside the heating mechanism 5 and improving the feeding accuracy.

[0056] The second feeding mechanism 4 further includes a second throat 44 and a second heat sink 45. The second heat sink 45 is disposed on the outer circumference of the second throat 44. The second throat 44 is connected to the base 1, and the second throat 44 can communicate with the outlet of the second conveying roller group 41. After the wire of the second material is output from the outlet of the second conveying roller group 41, it can pass through the second throat 44 and then be conveyed into the heating mechanism 5. The second throat 44 is disposed close to the heating mechanism 5, which can also convey and guide the second material, and the second heat sink 45 can dissipate heat from the second material, reducing the thermal deformation of the wire outside the heating mechanism 5 and improving the feeding accuracy.

[0057] In this embodiment, when the first conduit 33 is disposed at the outlet position of the first conveying roller group 31, the first conduit 33 can communicate with the first throat 34 to jointly convey and guide the wire of the first material. When the second conduit 43 is disposed at the outlet position of the second conveying roller group 41, the second conduit 43 can communicate with the second throat 44 to jointly convey and guide the wire of the second material.

[0058] As Figures 2 to 3 shown, in some embodiments, a bracket 12 is provided on the base 1. Both the first throat 34 and the second throat 44 can be connected to the bracket 12, and the bracket 12 can support the first throat 34 and the second throat 44.

[0059] As Figures 2 to 3 shown, in some embodiments, the 3D printing material feeding and spraying device further includes an adjusting mechanism 7. The adjusting mechanism 7 is disposed on one side of the first conveying roller group 31, and / or the adjusting mechanism 7 is disposed on one side of the second conveying roller group 41, that is, the adjusting mechanism 7 can perform roller pressure adjustment on one of the first conveying roller group 31 and the second conveying roller group 41, or can also perform adjustment on both of them respectively.

[0060] Among them, the adjusting mechanism 7 includes a swing arm 71, a bolt 72, and an elastic member 73. One end of the swing arm 71 is rotatably connected to the base 1, the other end of the swing arm 71 is connected to the bolt 72, the tail of the bolt 72 is threadedly connected to the base 1, and the elastic member 73 abuts between the base 1 and the swing arm 71. Rotating the bolt 72 can drive the swing arm 71 to approach or move away from the first conveying roller group 31 or the second conveying roller group 41.

[0061] During use, the user only needs to rotate the bolt 72 forward or backward. The tail of the bolt 72 can be screwed in closer to the base 1 or screwed out away from the base 1 through the thread. The elastic member 73 remains elastically abutted between the base 1 and the side wall of the swing arm 71, so that the position of the swing arm 71 and the head of the bolt 72 remains in tight contact, so that the head of the bolt 72 can squeeze or relax the swing arm 71 to drive the swing arm 71 to swing. The side wall of the swing arm 71 abuts against the first conveying roller group 31 or the second conveying roller group 41. The swing of the swing arm 71 can squeeze the first conveying roller group 31 or the second conveying roller group 41 with different pressing forces to adjust the distance between the first roller 311 and the second roller 312, and between the third roller 411 and the fourth roller 412, thereby adjusting the pressing force on the first material passing through the first conveying channel and the pressing force on the second material passing through the second conveying channel.

[0062] In this embodiment, the end of the swing arm 71 can be rotatably connected to the base 1 through a rotating shaft, and the tail of the bolt 72 can be threadedly connected to the bracket 12, so that the bolt 72 has sufficient installation space. The swing arm 71 can abut against one of the first roller 311 and the second roller 312 that is not connected to the first transmission wheel 32, and the swing arm 71 can abut against one of the third roller 411 and the fourth roller 412 that is not connected to the second transmission wheel 42, so as to reduce the influence on the position of the first transmission wheel 32 or the second transmission wheel 42 and ensure the transmission accuracy.

[0063] A slider can be arranged on the base 1. The slider is slidably connected to the base 1. A high-strength spring can be arranged between the slider and the base 1. The roller abutting against the swing arm 71 can be rotatably connected to the slider. Only when the swing arm 71 applies a large pressing force to the corresponding roller can the slider overcome the elastic force of the high-strength spring to slide. The high-strength spring can also restore its deformation after the force applied by the swing arm 71 disappears, so that the corresponding rollers move back to the initial distance.

[0064] As Figures 1 to 2 shown, in some embodiments, the heating mechanism 5 includes a connecting block 54, a thermocouple 55, and a heating rod 56. A heating channel is arranged in the connecting block 54. The first feed port 51, the second feed port 52, and the discharge port 53 are all communicated with the heating channel. The heating rod 56 is arranged in the heating channel. The thermocouple 55 is used to detect the temperature in the heating channel. The nozzle 6 is connected to the connecting block 54.

[0065] In use, the thermocouple 55 can feedback the detected actual temperature information in the heating channel to the heating rod 56. The heating rod 56 can adjust the magnitude of the input current according to the detected actual temperature information, and then adjust the heating temperature. The connecting block 54 can be mounted below the base 1. For example, the connecting block 54 can be connected to the base 1, the first throat 34 or the second throat 44. The nozzle 6 can be fixedly connected below the connecting block 54 to reduce the obstruction of the outlet of the nozzle 6 by components such as the base 1.

[0066] As Figures 1 to 3 shown, an embodiment of the second aspect of the present invention provides a 3D printing device, including the above-mentioned 3D printing feeding and spraying device and a plurality of unwinding mechanisms. The outlet of the unwinding mechanism can communicate with the inlet of the first conveying roller group 31 or the second conveying roller group 41.

[0067] In use, after the wire material is unwound from the unwinding mechanism, it can be conveyed to the first conveying roller group 31 or the second conveying roller group 41 for feeding and conveying. The first feeding mechanism 3 and the second feeding mechanism 4 can convey materials of different materials or different sizes. The first feeding mechanism 3 and the second feeding mechanism 4 can be provided with feeding power by the same driving mechanism 2. When the driving member 21 drives the driving wheel 22 to rotate forward, it can drive the first conveying roller group 31 to rotate to feed the first material to the heating mechanism 5, and drive the second conveying roller group 41 to rotate to feed the second material to the heating mechanism 5.

[0068] When the driving member 21 drives the driving wheel 22 to rotate reversely, it can drive the first conveying roller group 31 to rotate to retract the first material, and drive the second conveying roller group 41 to rotate to retract the second material. The feeding and retracting operations are convenient, and it is also convenient for the synchronous feeding of the first material and the second material. The volume ratio is easy to control. Moreover, different transmission ratios can be designed between the driving wheel 22 and the first transmission wheel 32 and between the driving wheel 22 and the second transmission wheel 42, so that the first conveying roller group 31 and the second conveying roller group 41 obtain different feeding speed ratios, and then composite printing bodies with different volume ratios are obtained.

[0069] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A 3D printing feed injection device, characterized in that: include: Base (1); A driving mechanism (2), the driving mechanism (2) being arranged on the base (1), the driving mechanism (2) comprising a driving member (21) and a driving wheel (22) which are connected to each other in a transmission manner, and the driving member (21) can drive the driving wheel (22) to rotate; A first feeding mechanism (3) comprises a first conveying roller group (31) and a first transmission wheel (32) which are connected to each other in a transmission manner, wherein the first conveying roller group (31) is rotatably connected to the base (1), and the first transmission wheel (32) is connected to the driving wheel (22) in a transmission manner; A second feeding mechanism (4) comprises a second conveying roller group (41) and a second transmission wheel (42) which are connected to each other in a transmission manner, wherein the second conveying roller group (41) is rotatably connected to the base (1), and the second transmission wheel (42) is connected to the driving wheel (22) in a transmission manner; A heating mechanism (5) having a first feed port (51), a second feed port (52) and a discharge port (53), wherein the first feed port (51) can be communicated with the outlet of the first conveying roller group (31), and the second feed port (52) can be communicated with the outlet of the second conveying roller group (41); A nozzle (6), wherein the nozzle (6) can be communicated with the discharge port (53).

2. The 3D printing feed injection device according to claim 1, characterized in that: The driving wheel (22) is detachably connected to the driving member (21), and / or the first transmission wheel (32) is detachably connected to the first conveying roller group (31), and / or the second transmission wheel (42) is detachably connected to the second conveying roller group (41).

3. The 3D printing feed injection device according to claim 1, characterized in that: The first conveying roller group (31) comprises a first roller body (311) and a second roller body (312) which are rotatably connected to the base (1); a distance is provided between the first roller body (311) and the second roller body (312) to form a first conveying channel; and one of the first roller body (311) and the second roller body (312) is fixedly connected to the first transmission wheel (32).

4. The 3D printing feed injection device according to claim 3, characterized in that: The second conveying roller group (41) comprises a third roller body (411) and a fourth roller body (412) which are rotatably connected to the base (1); a distance is provided between the third roller body (411) and the fourth roller body (412) to form a second conveying channel; and one of the third roller body (411) and the fourth roller body (412) is fixedly connected to the second transmission wheel (42).

5. The 3D printing feed injection device according to claim 4, characterized in that: The one of the first roller body (311) and the second roller body (312) connected to the first transmission wheel (32) is configured as a gear structure, and / or the one of the third roller body (411) and the fourth roller body (412) connected to the second transmission wheel (42) is configured as a gear structure.

6. The 3D printing feed injection device according to claim 1, characterized in that: The first feeding mechanism (3) further comprises a first conduit (33), the first conduit (33) being connected to the base (1), the first conduit (33) being arranged at an inlet and / or an outlet position of the first conveying roller group (31); and / or, The second feeding mechanism (4) further comprises a second conduit (43), the second conduit (43) being connected to the base (1), and the second conduit (43) being arranged at the inlet and / or outlet position of the second conveying roller group (41).

7. The 3D printing feed injection device according to claim 1, characterized in that: The first feeding mechanism (3) further comprises a first throat pipe (34) and a first heat sink (35), wherein the first heat sink (35) is arranged on the outer circumference of the first throat pipe (34), the first throat pipe (34) is connected to the base (1), and the first throat pipe (34) can be connected to the outlet of the first conveying roller group (31); and / or, The second feeding mechanism (4) further comprises a second throat pipe (44) and a second heat sink (45), wherein the second heat sink (45) is arranged on the outer circumference of the second throat pipe (44), the second throat pipe (44) is connected to the base (1), and the second throat pipe (44) can be connected to the outlet of the second conveying roller group (41).

8. The 3D printing feed injection device according to claim 1, characterized in that: The 3D printing feed injection device further comprises an adjusting mechanism (7), wherein the adjusting mechanism (7) is arranged on one side of the first conveying roller group (31), and / or the adjusting mechanism (7) is arranged on one side of the second conveying roller group (41); The adjusting mechanism (7) comprises a swing arm (71), a bolt (72) and an elastic member (73); one end of the swing arm (71) is rotatably connected to the base (1); the other end of the swing arm (71) is connected to the bolt (72); the tail of the bolt (72) is threadedly connected to the base (1); the elastic member (73) abuts between the base (1) and the swing arm (71); the rotation of the bolt (72) can drive the swing arm (71) to move closer to or farther from the first conveying roller group (31) or the second conveying roller group (41).

9. The 3D printing feed injection device according to claim 1, characterized in that: The heating mechanism (5) comprises a connecting block (54), a thermocouple (55) and a heating rod (56); a heating channel is arranged in the connecting block (54); the first feed port (51), the second feed port (52) and the discharge port (53) are all connected to the heating channel; the heating rod (56) is arranged in the heating channel; the thermocouple (55) is used to detect the temperature in the heating channel; and the nozzle (6) is connected to the connecting block (54).

10. A 3D printing device, characterized in that: It comprises a 3D printing feed injection device as described in any one of claims 1 to 9 and a plurality of unwinding mechanisms, wherein the outlet of the unwinding mechanism can be connected to the inlet of the first conveying roller group (31) or the second conveying roller group (41).

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