A filament drawing device for 3D printing

Abstract

This invention relates to the field of filament drawing technology for 3D printing, and particularly to a filament drawing device for 3D printing, comprising: two fixed frames, each with a rotating shaft rotatably connected to it, and the two rotating shafts being connected by a transmission belt. This invention uses a receiving groove on an arc-shaped receiving section in the middle of the transmission belt to receive the filament, and during the receiving process, it moves the filament. The rotation of the transmission belt and the straightening roller causes the receiving groove to engage with an annular groove to correct the roundness of the filament. Simultaneously, the filament is always supported by the receiving groove, preventing it from being suspended in the air during movement and thus deforming due to gravity. This improves the roundness and uniformity of the filament, avoiding the filament getting stuck on the print nozzle during 3D printing due to low uniformity, and improving the smoothness of filament use.

Description

Technical Field

[0001] This invention relates to the field of filament drawing technology for 3D printing consumables, and particularly to a filament drawing device for 3D printing consumables. Background Technology

[0002] 3D printing, also known as additive manufacturing, is a rapid prototyping technology. It is a technology that uses digital model files as a basis and employs powdered metal or plastic and other bondable materials to construct objects by printing layer by layer. 3D printing filaments are produced by melting raw materials, extruding them, and then drawing, cooling and shaping them into filaments.

[0003] During the filament drawing process for 3D printing, the filament is prone to deformation under its own weight and surface tension, resulting in uneven roundness. In later use, the protruding parts on the surface of the filament are easy to get stuck in the 3D printing nozzle, affecting the smoothness of 3D printing. Furthermore, the filament is prone to deformation during winding due to insufficient cooling and shaping, which also affects the uniformity of the filament diameter. Summary of the Invention

[0004] To solve the above problems, the present invention adopts the following technical solution: a 3D printing consumable drawing device, comprising: two fixed frames, each fixed frame being rotatably connected to a rotating shaft, the two rotating shafts being connected by a conveyor belt, and an arc-shaped receiving groove being formed on the outer side wall of the conveyor belt near the middle, the receiving groove being coated with an anti-stick coating.

[0005] A bracket is installed between two fixed frames, symmetrically arranged along the width of the conveyor belt. Ear plates are installed on the top of the bracket, symmetrically arranged along its length. A transition roller that is in close contact with the inner side wall of the upper side of the conveyor belt is rotatably connected between two corresponding ear plates along the width of the conveyor belt.

[0006] Two ear plates on the same bracket are mounted together on the end face of the conveyor belt. A guide roller is rotatably connected to the arc plate via a connecting seat. The guide roller is in rolling contact with the top of the conveyor belt. The middle of the upper section of the conveyor belt forms an arc-shaped receiving section with the cooperation of the transition roller and the guide roller.

[0007] One of the brackets has an arc-shaped box mounted on its top via a connecting rod, located above the arc-shaped receiving section of the conveyor belt. The lower arc-shaped sidewall of the arc-shaped box is rotatably connected to a uniformly arranged straightening roller via a frame plate. The straightening roller is in close contact with the conveyor belt, and an annular groove aligned with the receiving groove is provided on the straightening roller. The annular groove and the receiving groove cooperate to correct the roundness of the consumable.

[0008] One of the fixed frames is equipped with a guide assembly located above the conveyor belt and on one side of the curved receiving section of the conveyor belt. The guide assembly is used to guide the movement of consumables.

[0009] The arc-shaped box and two arc-shaped plates are equipped with cooling units for cooling and shaping consumables.

[0010] Preferably, the cooling assembly includes evenly arranged connecting holes on the bottom arc-shaped sidewall of the arc-shaped box, with connecting pipes connected to the connecting holes, the connecting pipes and the straightening rollers being arranged alternately, a cooling box connected to the connecting pipes being installed at the end of the connecting pipes away from the arc-shaped box, cooling holes evenly arranged on the end face of the cooling box near the conveyor belt, an air-gathering box being installed between the two arc-shaped plates, air-blowing holes evenly arranged on the top of the air-gathering box, a conveying pipe penetrating the arc-shaped plate and the support being installed on one side of the air-gathering box, and the arc-shaped box and the conveying pipe being connected by a connecting pipe.

[0011] Preferably, the diameters of both the air blowing hole and the connecting hole gradually increase along the moving direction of the consumable.

[0012] Preferably, the guide group includes a support frame mounted on a fixed frame and symmetrically arranged along the width direction of the conveyor belt. Multiple sets of guide rollers are rotatably connected between the two support frames and are evenly arranged from top to bottom. Each set of guide rollers consists of two symmetrically arranged guide rollers. The guide rollers are provided with annular guide grooves. A guide hole is formed between the two annular guide grooves in each set. The guide holes decrease in size from top to bottom. The multiple guide rollers arranged from top to bottom are connected by sprocket and chain drive. Two guide rollers in one set pass through the support frame and are fixedly fitted with gears. The two gears mesh and drive each other.

[0013] Preferably, a cooling roller is rotatably connected between the two support frames. The cooling roller has evenly distributed drainage holes in its middle. An arc-shaped sponge is fitted in the middle of the outer wall of the cooling roller. The lower side of the arc-shaped sponge is located in the receiving groove. The cooling roller is located on the side of the guide roller away from the arc-shaped receiving section of the conveyor belt. An infusion pipe that communicates with and passes through the support frame is installed at one end of the cooling roller.

[0014] Preferably, the inner sidewall of the conveyor belt is provided with uniformly arranged thickening grooves.

[0015] Preferably, the cooling box is an arc-shaped structure that partially covers the arc-shaped sidewalls of the consumables.

[0016] The beneficial effects of this invention are as follows: 1. The 3D printing filament drawing device designed in this invention receives the filament through the receiving groove on the arc-shaped receiving section in the middle of the conveyor belt, and drives the filament to move during the receiving process. The rotation of the conveyor belt and the straightening roller causes the receiving groove and the annular groove to cooperate to correct the roundness of the filament. At the same time, the filament is always supported under the receiving action of the receiving groove, preventing it from being suspended in the air during the movement and thus deforming due to gravity. This improves the roundness and uniformity of the filament, and avoids the filament getting stuck on the print nozzle during 3D printing due to low uniformity, thus improving the smoothness of filament use.

[0017] 2. In this invention, the air blown out by the air blowing hole cools the conveyor belt, thereby cooling the surface of the consumable material in the receiving groove. The air blown out by the cooling box cools the upper surface of the consumable material, thus comprehensively cooling and shaping the consumable material. The diameters of the air blowing hole and the connecting hole gradually increase along the moving direction of the consumable material, and the cooling effect on the surface of the consumable material gradually increases. This allows the roundness of the consumable material to be gradually cooled during the correction process, improving the quality of the consumable material drawing and preventing the consumable material from deforming again after correction.

[0018] 3. The cooling box in this invention is an arc-shaped structure that partially covers the arc-shaped sidewall of the consumable, so that the air blown out of the cooling holes can cool the consumable comprehensively, improve the cooling effect of the consumable, and prevent the consumable from deforming during winding, thus affecting its uniformity. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the main three-dimensional structure of the present invention.

[0021] Figure 2 This is a partial cross-sectional three-dimensional structural schematic diagram of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the local cooling assembly of the present invention.

[0023] Figure 4 This is a top view of the present invention.

[0024] Figure 5 This is the present invention. Figure 4 A sectional view along the AA direction.

[0025] Figure 6 This is the present invention. Figure 5 Enlarged view of point B in the image.

[0026] Figure 7 This is the present invention. Figure 5 Enlarged view of point C in the image.

[0027] In the diagram: 1. Fixed frame; 10. Support; 110. Arc plate; 111. Guide roller; 112. Arc receiving section; 113. Connecting rod; 114. Arc box; 115. Correcting roller; 116. Annular groove; 11. Ear plate; 12. Transition roller; 2. Rotating shaft; 3. Conveyor belt; 30. Thickening groove; 4. Receiving groove; 5. Guide group; 50. Support frame; 51. Guide roller; 52. Annular guide groove; 53. Cooling roller; 54. Leakage hole; 55. Arc sponge; 56. Infusion pipe; 6. Cooling group; 60. Connecting hole; 61. Connecting pipe; 62. Cooling box; 63. Cooling hole; 64. Air collection box; 65. Air blowing hole; 66. Conveying pipe; 67. Through pipe; 7. Consumables. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0029] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 A 3D printing consumable drawing device includes: two fixed frames 1, each fixed frame 1 is rotatably connected to a rotating shaft 2, the two rotating shafts 2 are connected by a conveyor belt 3, and the outer side wall of the conveyor belt 3 is provided with an arc-shaped receiving groove 4 near the middle, the receiving groove 4 is coated with an anti-stick coating.

[0030] A bracket 10 is installed between two fixed frames 1, which are symmetrically arranged along the width direction of the conveyor belt 3. The top of the bracket 10 is equipped with ear plates 11 symmetrically arranged along its length direction. A transition roller 12 that is in close contact with the upper inner wall of the conveyor belt 3 is rotatably connected between two corresponding ear plates 11 along the width direction of the conveyor belt 3.

[0031] Two ear plates 11 on the same bracket 10 are mounted with an arc-shaped plate 110 near the end face of the conveyor belt 3. Guide rollers 111, evenly arranged along the arc-shaped segment of the arc-shaped plate 110, are rotatably connected to the arc-shaped plate 110 via connecting seats. The guide rollers 111 make rolling contact with the top of the conveyor belt 3. Figure 5 As shown, the middle section of the upper side of the conveyor belt 3 forms an arc-shaped receiving section 112 with the cooperation of the transition roller 12 and the guide roller 111.

[0032] One of the brackets 10 has an arc-shaped box 114 mounted on its top via a connecting rod 113, located above the arc-shaped receiving section 112 of the conveyor belt 3. The lower arc-shaped sidewall of the arc-shaped box 114 is rotatably connected to a frame plate with evenly arranged straightening rollers 115. The straightening rollers 115 are in close contact with the conveyor belt 3. The straightening rollers 115 have an annular groove 116 aligned with the receiving groove 4. The annular groove 116 and the receiving groove 4 cooperate to correct the roundness of the consumable 7.

[0033] One of the fixed frames 1 is equipped with a guide group 5 located above the conveyor belt 3 and on one side of the arc-shaped receiving section 112 of the conveyor belt 3. The guide group 5 is used to guide the movement of the consumable 7.

[0034] Cooling units 6 for cooling and shaping consumables 7 are installed on the arc-shaped box 114 and the two arc-shaped plates 110.

[0035] During operation, after the consumable 7 is extruded, it moves from the guide group 5 to the receiving groove 4 of the conveyor belt 3. During this process, the guide group 5 squeezes and guides the extruded consumable 7, so that the diameter of the consumable 7 gradually approaches the circular diameter formed by the annular groove 116 and the receiving groove 4, thereby achieving the initial correction of the consumable 7.

[0036] When the filament 7 enters the receiving groove 4, the conveyor belt 3 moves the filament 7 along the arc-shaped receiving section 112 of the conveyor belt 3. During the movement, the filament 7 contacts the annular groove 116 of the straightening roller 115. At the same time, the conveyor belt 3 drives the straightening roller 115 to rotate through the friction between itself and the side wall of the straightening roller 115. The rotation of the conveyor belt 3 and the straightening roller 115 causes the receiving groove 4 and the annular groove 116 to cooperate in correcting the roundness of the filament 7. Meanwhile, the filament 7 is always supported by the receiving groove 4, preventing it from being suspended in the air during movement and deforming due to gravity. This improves the roundness and uniformity of the filament 7 during the drawing process, avoiding the filament 7 getting stuck on the print nozzle during 3D printing due to low uniformity, and improving the smoothness of the use of the filament 7. During the roundness and uniformity correction of the filament 7, the cooling group 6 gradually cools and shapes the filament 7.

[0037] See Figure 1 , Figure 4 and Figure 5The guide group 5 includes a support frame 50 mounted on the fixed frame 1 and symmetrically arranged along the width direction of the conveyor belt 3. Multiple sets of guide rollers 51 are rotatably connected between the two support frames 50 and are evenly arranged from top to bottom. Each set of guide rollers 51 consists of two symmetrically arranged guide rollers 51. The guide rollers 51 are provided with annular guide grooves 52. A guide hole is formed between the two annular guide grooves 52 in each set. The guide holes decrease in size from top to bottom. The multiple guide rollers 51 arranged from top to bottom are connected by sprocket and chain drive. Two guide rollers 51 in one set pass through the support frame 50 and are fixedly fitted with gears. The two gears mesh and drive each other.

[0038] One of the guide rollers 51 connected to the gear is connected to an external drive motor that drives it to rotate. During the rotation of the guide roller 51 connected to the external drive motor, the meshing between the two gears drives another guide roller 51 to rotate. During the rotation of the guide rollers 51, they are connected by a sprocket chain, so that multiple guide rollers 51 rotate. Before the consumable 7 enters the receiving groove 4 on the conveyor belt 3, it first passes through the annular guide grooves 52 on multiple sets of guide rollers 51 arranged from top to bottom for diameter correction. As the consumable 7 passes through the multiple guide holes arranged from top to bottom formed by the annular guide grooves 52, the diameter of the consumable 7 is gradually corrected, thus achieving the initial correction of the diameter of the consumable 7.

[0039] See Figure 1 , Figure 2 and Figure 7 A cooling roller 53 is rotatably connected between the two support frames 50. The cooling roller 53 has evenly distributed drainage holes 54 in the middle. An arc-shaped sponge 55 is sleeved in the middle of the outer wall of the cooling roller 53. The lower side of the arc-shaped sponge 55 is located in the receiving groove 4. The cooling roller 53 is located on the side of the guide roller 51 away from the arc-shaped receiving section 112 on the conveyor belt 3. An infusion pipe 56 is installed at one end of the cooling roller 53, which is connected to it and passes through the support frame 50.

[0040] The infusion tube 56 is connected to an external water pump, which delivers water to the cooling roller 53. The water then seeps through the drain hole 54 onto the arc-shaped sponge 55. As the conveyor belt 3 rotates, the friction between the receiving groove 4 and the arc-shaped sponge 55 drives the cooling roller 53 to rotate, brushing the water on the arc-shaped sponge 55 into the receiving groove 4, thus lowering the temperature inside the receiving groove 4. This allows the consumable 7 to receive initial cooling treatment when it comes into contact with the cooled receiving groove 4, and also allows for initial shaping of the consumable 7.

[0041] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6The cooling group 6 includes evenly arranged connecting holes 60 on the bottom arc-shaped sidewall of the arc-shaped box 114. A connecting pipe 61 communicating with the connecting hole 60 is installed on the connecting hole 60. The connecting pipe 61 is arranged alternately with the straightening roller 115. A cooling box 62 communicating with the end of the connecting pipe 61 away from the arc-shaped box 114 is installed. The cooling box 62 has evenly arranged cooling holes 63 on the end face near the conveyor belt 3. An air-gathering box 64 is installed between the two arc-shaped plates 110. The top of the air-gathering box 64 has evenly arranged blowing holes 65. A conveying pipe 66 penetrating the arc-shaped plate 110 and the support 10 is installed on one side of the air-gathering box 64. The arc-shaped box 114 and the conveying pipe 66 are connected by a conveying pipe 67.

[0042] See Figure 6 The diameters of the air blowing hole 65 and the connecting hole 60 gradually increase along the moving direction of the consumable 7.

[0043] The conveying pipe 66 is connected to an external blower. During the process of the consumable 7 moving and being corrected by the conveyor belt 3, the air enters the air collecting box 64 and the arc-shaped box 114. The air in the arc-shaped box 114 enters the cooling box 62 through the connecting hole 60 and the connecting pipe 61, and then blows onto the consumable 7 through the cooling hole 63 on the cooling box 62. The air in the air collecting box 64 blows onto the conveyor belt 3 through the blowing hole 65, thereby cooling the conveyor belt 3 and cooling the surface of the consumable 7 in the receiving groove 4. The diameters of the blowing hole 65 and the connecting hole 60 gradually increase along the moving direction of the consumable 7, and the cooling effect on the surface of the consumable 7 gradually increases. This allows the consumable 7 to gradually cool down during the process of gradually correcting its roundness, improving the quality of the wire drawing of the consumable 7 and preventing the consumable 7 from deforming again after correction.

[0044] See Figure 3 The cooling box 62 is an arc-shaped structure that partially covers the arc-shaped sidewall of the consumable 7, so that the air blown out of the cooling hole 63 can cool the consumable 7 comprehensively, thereby improving the cooling effect of the consumable 7.

[0045] See Figure 1 The inner wall of the conveyor belt 3 is provided with uniformly arranged thickened grooves 30, which facilitates the air blown out of the air blowing hole 65 to cool down the consumable 7 in the receiving groove 4.

[0046] During operation, the consumable 7 enters the receiving groove 4 on the arc-shaped receiving section 112 of the conveyor belt 3 from one side of the guide group 5 during wire drawing. Then, it is pulled out from one side of the arc-shaped receiving section 112 of the conveyor belt 3 and wound into a roll by the external consumable 7 winding mechanism. One end of one of the rotating shafts 2 passes through the fixed frame 1 and is connected to the external drive motor that drives it to rotate. During the rotation of the rotating shaft 2, the conveyor belt 3 drives the consumable 7 in the receiving groove 4 to move, and the receiving groove 4 supports the consumable 7 to prevent the consumable 7 from deforming under its own weight.

[0047] After the consumable 7 is extruded, it moves from the guide group 5 to the receiving groove 4 of the conveyor belt 3. During this process, the guide group 5 squeezes and guides the extruded consumable 7, so that the diameter of the consumable 7 gradually approaches the circular diameter formed by the annular groove 116 and the receiving groove 4, thereby achieving the initial correction of the diameter of the consumable 7.

[0048] When the consumable 7 enters the receiving groove 4, the conveyor belt 3 moves the consumable 7 along the arc-shaped receiving section 112 of the conveyor belt 3. During the movement, the consumable 7 contacts the annular groove 116 of the straightening roller 115. At the same time, the conveyor belt 3 drives the straightening roller 115 to rotate through the friction between itself and the side wall of the straightening roller 115. The rotation of the conveyor belt 3 and the straightening roller 115 causes the receiving groove 4 and the annular groove 116 to cooperate in correcting the roundness of the consumable 7. Meanwhile, the consumable 7 is always supported by the receiving groove 4, preventing it from being suspended in the air during the movement and deforming due to gravity. This improves the roundness and uniformity of the consumable 7 during the drawing process, avoiding the problem of the consumable 7 getting stuck on the print nozzle during 3D printing due to low uniformity, and improving the smoothness of the use of the consumable 7.

[0049] Furthermore, while the roundness and uniformity of the consumable 7 are being corrected, the cooling unit 6 gradually cools and shapes the consumable 7.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A filament drawing device for 3D printing, comprising: Two fixed frames, characterized in that: each of the two fixed frames is rotatably connected to a rotating shaft, the two rotating shafts are connected by a transmission belt, and an arc-shaped receiving groove is opened on the outer side wall of the transmission belt near the middle, and the receiving groove is coated with an anti-stick coating. A bracket is installed between two fixed frames, symmetrically arranged along the width of the transmission belt. Ear plates are installed on the top of the bracket, symmetrically arranged along its length. A transition roller that is in close contact with the upper inner wall of the transmission belt is rotatably connected between two corresponding ear plates along the width of the transmission belt. Two ear plates on the same bracket are mounted together with an arc plate near the end face of the transmission belt. The arc plate is rotatably connected to a guide roller that is evenly arranged along the arc section of the arc plate through a connecting seat. The guide roller makes rolling contact with the top of the transmission belt. The middle of the upper section of the transmission belt forms an arc-shaped receiving section with the cooperation of the transition roller and the guide roller. One of the brackets has an arc-shaped box mounted on its top via a connecting rod, located above the arc-shaped receiving section of the transmission belt. The lower arc-shaped sidewall of the arc-shaped box is rotatably connected to a uniformly arranged straightening roller via a frame plate. The straightening roller is in close contact with the transmission belt. The straightening roller has an annular groove aligned with the receiving groove. The annular groove and the receiving groove cooperate to correct the roundness of the consumable. One of the mounting brackets is equipped with a guide assembly located above the transmission belt and on one side of the arc-shaped receiving section of the transmission belt. The guide assembly is used to guide the movement of consumables. The arc-shaped box and two arc-shaped plates are equipped with cooling units for cooling and shaping consumables; The cooling assembly includes evenly arranged connecting holes on the bottom arc-shaped sidewall of the arc-shaped box, with connecting pipes connected to the connecting holes. The connecting pipes are arranged alternately with the straightening rollers. A cooling box is connected to the end of the connecting pipe away from the arc-shaped box. The cooling box has evenly arranged cooling holes on its end face near the transmission belt. An air-gathering box is installed between the two arc-shaped plates. The top of the air-gathering box has evenly arranged blowing holes. A conveying pipe is installed on one side of the air-gathering box, penetrating the arc-shaped plate and the support. The arc-shaped box and the conveying pipe are connected by a connecting pipe. The cooling box is an arc-shaped structure that partially covers the arc-shaped sidewall of the consumable; the diameters of the air blowing hole and the connecting hole gradually increase along the moving direction of the consumable.

2. The filament drawing equipment for 3D printing according to claim 1, characterized in that: The guide assembly includes a support frame mounted on a fixed frame and symmetrically arranged along the width of the transmission belt. Multiple sets of guide rollers are rotatably connected between the two support frames and are evenly arranged from top to bottom. Each set of guide rollers consists of two symmetrically arranged guide rollers. The guide rollers have annular guide grooves. A guide hole is formed between the two annular guide grooves in each set. The guide holes decrease in size from top to bottom. The multiple guide rollers arranged from top to bottom are connected by a sprocket and chain drive. Two guide rollers in one set pass through the support frame and are fixedly fitted with gears. The two gears mesh and drive each other.

3. The filament drawing equipment for 3D printing according to claim 2, characterized in that: A cooling roller is rotatably connected between the two support frames. The cooling roller has evenly distributed drainage holes in its middle. An arc-shaped sponge is fitted in the middle of the outer wall of the cooling roller. The lower side of the arc-shaped sponge is located in the receiving groove. The cooling roller is located on the side of the guide roller away from the arc-shaped receiving section of the transmission belt. An infusion pipe that communicates with and passes through the support frame is installed at one end of the cooling roller.

4. The filament drawing equipment for 3D printing according to claim 1, characterized in that: The inner wall of the transmission belt is provided with uniformly arranged thickening grooves.

Images