Cylindrical lengthened FDM printing nozzle extruded by frosted shaft wheel

Abstract

The utility model discloses a cylindrical lengthened FDM printing nozzle extruded by a frosted shaft wheel. The cylindrical lengthened FDM printing nozzle comprises nozzles which are sequentially and coaxially connected from bottom to top, a first shaft cavity is formed in the spray pipe; the sleeve is provided with a second shaft cavity, a third shaft cavity and a fourth shaft cavity, the second shaft cavity is used for a wire to penetrate through, the third shaft cavity and the fourth shaft cavity are arranged on the left side and the right side of the second shaft cavity with the second shaft cavity as the symmetry axis and communicated with the second shaft cavity, and frosted shaft wheels are arranged in the third shaft cavity and the fourth shaft cavity respectively. A printing wire material is rotated, extruded and guided into the spray pipe through the two grinding shaft wheels; the annular heating unit is arranged at the bottom of the sleeve, located between the outer wall of the spray pipe and the inner wall of the sleeve and used for heating and melting the wires entering the spray pipe to form molten printing materials. The cylindrical lengthened FDM printing spray head has the technical advantages that printing wires can be more stably and smoothly extruded, and the printing precision can be conveniently controlled.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing equipment, and in particular to a cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel. Background Art

[0002] Nowadays, the 3D printers using FDM technology use extrusion to transport the printing filaments. The movement of the filaments is driven by a large and complex extrusion mechanism. The contact surface of the extrusion is small and the extrusion force is weak, which has a great impact on the control of printing accuracy. In addition, the complex extrusion mechanism makes the entire printing nozzle system huge. If multiple long straight structural parts are printed at one time, interference is very likely to occur. The entire project can only be printed layer by layer, which increases the printing time and puts forward more stringent conditions for printing accuracy and the amount of extrusion. In terms of cooling methods, traditional FDM printing technology still uses air cooling for cooling accessories other than the nozzle module. By adding a heat dissipation module to the printing extrusion mechanism and configuring a corresponding fan to enhance the heat dissipation capacity of other components, it is not conducive to the melting of the printing consumables in the annular heating unit and the nozzle to affect the subsequent printing consumables through heat conduction, causing the consumables to soften. Good heat dissipation also makes the promotion of the molten consumables more powerful when extruding the filament, improving the printing accuracy.

[0003] The patent with announcement number CN212636590U also proposed the use of screw extrusion to improve the effect of extruding consumables, but there are still some problems that need to be improved: First, the old air cooling device is still used, and the air cooling mode is not conducive to the control of the volume of the entire basic mechanism and nozzle system. Second, the shaft transmission method uses a nearby hollow shaft motor for transmission, and the installation of a motor will still expand the volume of the system structure. Third, the threaded shaft is used for extrusion, and the contact surface between the shaft and the printing consumables is smooth, and there may still be a slipping phenomenon, which is not conducive to the regulation of printing accuracy. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model discloses an extended FDM printing nozzle extruded by a frosted shaft wheel, which has a simpler and more compact structure and is easy to install. The extended nozzle feature is more convenient for printing multiple products at a time, and there is no need to print layer by layer during the printing process, which improves the printing efficiency and the application range of printing.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical means:

[0006] A cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel, comprising:

[0007] nozzle;

[0008] A nozzle having a first axial cavity disposed thereon;

[0009] The sleeve is provided with a second shaft cavity for the wire to pass through, and a third shaft cavity and a fourth shaft cavity are arranged on the left and right sides of the second shaft cavity with the second shaft cavity as the symmetric axis and are connected to the second shaft cavity, and the third shaft cavity and the fourth shaft cavity are respectively provided with a grinding shaft wheel, and the printing wire is guided into the nozzle by the rotation and extrusion of the two grinding shaft wheels;

[0010] The annular heating unit is arranged at the bottom of the sleeve and is located between the outer wall of the nozzle and the inner wall of the sleeve, and is used to heat the filament entering the nozzle and melt it to form a melted printing material.

[0011] The lower end of the sleeve is provided with an external threaded connection section corresponding to the nozzle, and there is space at the connection point for placing a throat pipe. The upper end of the nozzle is provided with a second internal threaded hole threadedly connected to the external threaded connection section.

[0012] The lower end portion of the sleeve is provided with two symmetrically arranged first internal threaded holes for screwing in fastening screws to clamp the annular heating unit.

[0013] Two condensate flow channels are arranged inside the sleeve, and the two condensate flow channels are respectively located outside the two grinding shaft wheels. The inlet end of the condensate flow channel is opened on the outer wall of the bottom of the sleeve, and the outlet end is located at the top of the sleeve.

[0014] The inlet end of the condensate flow channel is provided with an internal threaded hole for connecting with an external condensate water supply pipe.

[0015] The diameter of the second shaft cavity is 1.1 to 1.2 times the diameter of the printing wire; the two frosted shaft wheels are arranged in parallel, and the reserved gap between the frosted shaft wheels is 0.8 to 0.9 times the diameter of the printing wire.

[0016] A heat dissipation gap is provided at the bottom of the sleeve at the annular heating unit for heat dissipation.

[0017] The annular heating unit adopts a ceramic heating ring.

[0018] Beneficial effects:

[0019] In summary, the utility model has the following advantages compared with the existing printing nozzle:

[0020] First, the utility model is a cylindrical extended FDM printing nozzle extruded by a frosted shaft wheel. The sleeve is provided with shaft cavities for installing the frosted shaft wheel on the left and right sides of the wire channel. The printing wire enters the nozzle along the printing wire guide groove under the extrusion of the frosted shaft wheel and is completely melted in the nozzle. The subsequent extruded printing wire will push the molten printing consumables to be extruded from the nozzle, and will soften and stack after external cooling. The printed model formed at room temperature will form a stable shape.

[0021] Second, the sleeve is provided with a condensate circulation system, and the condensate enters the sleeve from the condensate inlet on the side wall of the bottom of the sleeve; the condensate outlet is arranged at the top of the sleeve, and the condensate at the outlet is refluxed to the condensate circulation pump at the far end, and the circulating flow of the condensate takes away the heat radiation received by the sleeve itself; the liquid cooling method is more stable and efficient, and sufficient cooling of the sleeve can reduce the softening effect of the annular heating unit on the printing filament that has not entered the annular heating unit, which can make the extrusion of the printing filament more stable and smooth, and facilitate the control of printing accuracy.

[0022] Third, the grinding shaft wheel is driven to rotate by applying a rotational force to the transmission shaft at the end of the grinding shaft wheel. The rotation of the transmission shaft at the end of the grinding shaft wheel is provided by an external motor. The power source mechanism can also be moved away from the extrusion mechanism by extending the transmission shaft design to reduce the volume and complexity of the basic mechanism.

[0023] Fourth, the long nozzle also brings a potential new printing method. When printing multiple project products at one time, the products can be printed one by one on the printing operation platform, instead of printing all products at the same level. In traditional 3D printing slicing software, multiple products are placed independently on a platform. When slicing and printing, different products but products at the same plane height will be printed at the same time. Different products are separated from each other, and the print nozzle always needs to cross the gap and print one product at a time, which we call printing at the same level. Crossing the gap will produce obvious crossing marks when changing the product printing, which greatly affects the fineness of the printing and the quality of the finished product. The extended print nozzle is slender in nature, so it is not easy to produce printing interference when printing multiple products separately, so it is convenient to print one by one instead of printing at the same level. This can improve printing efficiency and printing accuracy. In the slicing software, high-quality printing of multiple products can be completed in one slice. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the assembly diagram of the utility model

[0025] Figure 2 yes Figure 1 This is an exploded view of the assembly of the utility model

[0026] Figure 3 yes Figure 1 Axis view of the sleeve component in

[0027] Figure 4 yes Figure 1 Axonometric view of the nozzle in

[0028] Figure 5 yes Figure 1 Axle side view of the frosted wheel

[0029] In the figure: 1. sleeve; 101. third axial cavity; 102. second axial cavity; 103. condensate inlet; 104. condensate outlet; 105. external threaded connection section; 106. first internal threaded hole; 107. fourth axial cavity; 2. annular heating unit; 3. nozzle; 301. second internal threaded hole; 302. nozzle; 4. frosted shaft wheel. DETAILED DESCRIPTION

[0030] The utility model is further described through the following examples. The purpose of disclosing the utility model is to protect all technical improvements within the scope of the utility model, and the utility model is not limited to the following embodiments.

[0031] like Figure 1 As shown, a cylindrical extended FDM printing nozzle using frosted shaft wheel extrusion includes a sleeve 1, a frosted shaft wheel 4, a ring heating unit 2 and a nozzle 3.

[0032] The sleeve 1 is connected to the nozzle 3 by threads, and the two symmetrical internal thread holes 106 at the lower end of the sleeve 1 are screwed into the fastening screws to fasten the annular heating unit 2 to a suitable position just to heat the nozzle.

[0033] The two frosted shaft wheels are placed in the third and fourth shaft cavities of the sleeve respectively, and the printing filament is placed between the two frosted shaft wheels. The frosted shaft wheels rotate to drive the printing filament downward and enter the filament guide groove. The printing filament enters the nozzle along the printing filament guide groove under the extrusion of the frosted shaft wheels, and is completely melted in the nozzle. The subsequent extruded printing filament will push the molten printing consumables out of the nozzle, and will soften and stack after external cooling. When it reaches room temperature, the formed printing model will form a stable shape.

[0034] As a preferred technical means, the distance between the edges of the two frosted shaft wheels is smaller than the diameter of the printing wire (the distance is approximately 0.8 times the diameter of the printing wire), which facilitates uniform stress on the printing wire and ensures extrusion strength.

[0035] The grinding shaft wheel is driven to rotate by applying a rotational force to the transmission shaft at the end of the grinding shaft wheel. The rotation of the transmission shaft at the end of the grinding shaft wheel is provided by an external motor. The power source mechanism can also be moved away from the extrusion mechanism by extending the transmission shaft design to reduce the volume and complexity of the basic mechanism.

[0036] As a further preferred embodiment of the present invention, the sleeve is provided with a condensate circulation system, and the condensate enters the interior of the sleeve from the condensate inlet on the bottom side wall of the sleeve; the condensate inlet is provided with a threaded hole to facilitate the external condensate pipeline to be terminated to the sleeve part; the condensate outlet is arranged at the top of the sleeve, and the condensate at the outlet is refluxed to the condensate circulation pump at the far end, and the circulating flow of the condensate takes away the heat radiation received by the sleeve itself; the liquid cooling heat dissipation method is more stable and efficient, and sufficient cooling of the sleeve can reduce the softening effect of the annular heating unit on the printing filament that has not entered the annular heating unit, which can make the extrusion of the printing filament more stable and smooth, and facilitate the control of printing accuracy.

Claims

1. A cylindrical extended FDM printing nozzle extruded by a frosted shaft wheel, characterized in that: Including coaxial connection from bottom to top: nozzle; A nozzle having a first axial cavity disposed thereon; A sleeve (1) is provided with a second axial cavity for a filament to pass through, and a third axial cavity and a fourth axial cavity arranged on the left and right sides of the second axial cavity with the second axial cavity as a symmetric axis and connected to the second axial cavity, wherein the third axial cavity and the fourth axial cavity are respectively provided with a grinding shaft wheel, and the printing filament is guided into the nozzle (3) by rotation, extrusion and guidance of the two grinding shaft wheels; The annular heating unit is arranged at the bottom of the sleeve and is located between the outer wall of the nozzle and the inner wall of the sleeve, and is used to heat the filament entering the nozzle and melt it to form a melted printing material.

2. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 1 is characterized in that: The lower end of the sleeve (1) is provided with an external threaded connection section correspondingly connected to the nozzle (3), and there is space at the connection for placing a throat pipe. The upper end of the nozzle is provided with a second internal threaded hole (301) threadedly connected to the external threaded connection section.

3. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 1 is characterized in that: The lower end portion of the sleeve (1) is provided with two symmetrically arranged first internal threaded holes (106) for screwing in fastening screws to clamp the annular heating unit.

4. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 1, characterized in that: Two condensate flow channels are arranged inside the sleeve (1), and the two condensate flow channels are respectively located on the outsides of the two grinding shaft wheels. The inlet ends of the condensate flow channels are opened on the outer wall of the bottom of the sleeve (1), and the outlet ends are located at the top of the sleeve.

5. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 4, characterized in that: The inlet end of the condensate flow channel is provided with an internal threaded hole for connecting with an external condensate water supply pipe.

6. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 1, characterized in that: The diameter of the second shaft cavity is 1.1 to 1.2 times the diameter of the printing wire; the two frosted shaft wheels are arranged in parallel, and the reserved gap between the frosted shaft wheels is 0.8 to 0.9 times the diameter of the printing wire.

7. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 1, characterized in that: The bottom of the sleeve (1) is provided with a heat dissipation notch located at the annular heating unit for heat dissipation.

8. The cylindrical elongated FDM printing nozzle extruded by a frosted shaft wheel according to claim 1, characterized in that: The annular heating unit is an annular heating unit.

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