Nozzle and 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups

Abstract

The invention provides a nozzle and a 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups, which are used to solve the problem in the prior art that the mechanical properties of the thermoplastic LCP fiber self-reinforced material stirrups will be reduced due to interlayer cracks during the 3D printing process; by arranging a second heating device on the outer side wall of a barrel, and a first tooth-shaped heating structure is arranged on a side surface of a heating plate away from the barrel, and a spray channel is arranged in a square shape, and a first tooth-shaped structure is arranged on a side surface of the spray channel close to the forward direction of the nozzle, and a second tooth-shaped structure staggered with the first tooth-shaped structure is arranged on a side surface away from the forward direction of the nozzle; the heating device is convenient for heating the printed thermoplastic LCP fiber self-reinforced material strip, and the contact area between the thermoplastic LCP fiber self-reinforced material to be printed and the printed thermoplastic LCP fiber self-reinforced material strip is increased, so as to ensure that they can be fully fused and avoid the generation of interlayer cracks.

Description

Technical Field

[0001] The invention belongs to the field of stirrup 3D printing, and in particular relates to a nozzle and a 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups. Background Art

[0002] At present, 3D printing technology for building structures is the development direction of future construction. With the successful development of many building 3D printing concrete materials and the in-depth research on the performance of 3D printing concrete, more and more scholars have begun to try to print building structures. After the building structure is printed, due to the characteristics of 3D printing, 3D printed concrete components will produce cracks between and between layers. In addition, the stirrups in the existing building structures are made of steel bars. When the building structure is used in the future, the outside air enters the concrete structure through the cracks between the bars and the cracks between the layers, causing the steel bars to rust, thereby reducing the durability of the building.

[0003] Thermoplastic LCP (LCP's Chinese name is liquid crystal polyarylate, and its English name is Liquid Crystal Polymer) fiber self-reinforced material is a new type of polymer material with unique properties. It has the characteristics of light weight, high strength, and good corrosion resistance. Using it to replace the steel bars in the building structure can solve the problem of steel bar corrosion, thereby improving the durability of the building structure. However, when using 3D printing technology to print thermoplastic LCP fiber self-reinforced material stirrups, inter-strip cracks and inter-layer cracks will still occur. Although due to the characteristics of thermoplastic LCP fiber self-reinforced materials, it can effectively avoid the problem of rust by the outside air, but inter-strip cracks and inter-layer cracks will cause the mechanical properties of the thermoplastic LCP fiber self-reinforced material stirrups, such as tensile strength and shear strength, to decrease, affecting the subsequent performance of the building structure. Summary of the invention

[0004] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a nozzle and a 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups, which are used to solve the problem in the prior art that the mechanical properties of thermoplastic LCP fiber self-reinforced material stirrups will be reduced due to interlayer cracks during the 3D printing process.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups, comprising: a barrel, a first feed pipe, a second feed pipe, a stirring device, a nozzle, a first heating device and a second heating device; a holding cavity for holding the thermoplastic LCP fiber self-reinforced material to be printed is provided in the barrel, the first feed pipe is connected to the holding cavity, and is used to transport the liquid crystal material into the holding cavity; the second feed pipe is connected to the holding cavity, one end of the second feed pipe extends into the holding cavity, and the other end is located outside the holding cavity and connected to the barrel, and is used to transport the fiber filaments into the holding cavity;

[0006] The stirring device and the first heating device are at least partially arranged in the accommodating chamber, the stirring device is used to stir the liquid crystal material in the accommodating chamber, and the first heating device is used to heat the liquid crystal material in the accommodating chamber; the fiber filaments and the heated liquid crystal material are mixed in the accommodating chamber to form the thermoplastic LCP fiber self-reinforced material to be printed; the nozzle is arranged on the barrel and connected to the accommodating chamber; the second heating device is arranged on the outer side of the barrel facing the forward direction of the nozzle, and is used to heat the printed thermoplastic LCP fiber self-reinforced material; the spraying channel of the nozzle is square, and a first tooth-shaped structure is arranged on a side surface of the spraying channel close to the forward direction of the nozzle, and a second tooth-shaped structure staggered with the first tooth-shaped structure is arranged on a side surface away from the forward direction of the nozzle; the first tooth-shaped heating structure is arranged on the side surface of the heating plate of the second heating device away from the barrel; the heating plate heats the printed thermoplastic LCP fiber self-reinforced material through the first tooth-shaped heating structure, so that the thermoplastic LCP fiber self-reinforced material to be printed sprayed out of the nozzle is fused with the printed thermoplastic LCP fiber self-reinforced material.

[0007] Optionally, one of the two side surfaces of the nozzle's spray channel parallel to the nozzle's forward direction is provided with a first tooth-shaped structure, and the other is provided with a second tooth-shaped structure; the heating plate is provided with a second tooth-shaped heating structure on the side corresponding to the side provided with the first tooth-shaped structure, and the heating plate is provided with a first tooth-shaped heating structure on the side corresponding to the side provided with the second tooth-shaped structure.

[0008] Optionally, the heating plate includes an inclined section, a transition section and a straight section, one end of the transition section is connected to the inclined section, and the other end is connected to the straight section; the end of the inclined section away from the transition section is arranged away from the nozzle, and the opening direction of the angle formed between the straight section and the inclined section is arranged toward the barrel.

[0009] Optionally, the stirring device includes a stirring shaft assembly, a stirring motor and a stirring blade; the stirring blade is arranged on the stirring shaft assembly and is located in the accommodating cavity; one end of the stirring shaft assembly extends out of the accommodating cavity and is connected to the stirring motor; the first heating device includes a first heating element and a second heating element, the first heating element is arranged on the stirring blade; the second heating element is arranged on the inner wall of the accommodating cavity.

[0010] Optionally, the stirring shaft assembly includes a first stirring shaft and a second stirring shaft, the first stirring shaft is a hollow shaft, and a transmission gear is arranged at one end of the first stirring shaft extending out of the accommodating chamber; a driving gear is arranged on the transmission shaft of the stirring motor, and the driving gear is meshed with the transmission gear; the second stirring shaft is a hollow shaft, and the outer diameter of the second stirring shaft is smaller than the inner diameter of the first stirring shaft; one end of the second stirring shaft extending into the accommodating chamber is connected to one end of the first stirring shaft extending into the accommodating chamber, and the first stirring shaft is sleeved on the second stirring shaft; a spiral mounting portion for mounting a stirring blade is arranged on the side wall of the end of the first stirring shaft extending into the accommodating chamber, and the stirring blade is spiral, and the stirring blade is connected to the stirring shaft The connecting end of the mixing shaft is a spiral mounting structure adapted to the spiral mounting portion; the spiral mounting portion is used to fix the mixing blades in the circumferential and radial directions of the mixing shaft; the second mixing shaft is used to fix the mixing blades in the axial direction of the first mixing shaft; one end of the second mixing shaft extending out of the accommodating cavity is provided with a through-hole conductive slip ring, the cable of the first heating element is arranged in the cavity formed by the inner side surface of the first mixing shaft and the outer side surface of the second mixing shaft, one end of the cable of the first heating element is connected to the first heating element, and the other end is connected to the through-hole conductive slip ring; the second mixing shaft is sleeved on the second feeding pipe, and the second mixing shaft and the second feeding pipe are clearance-matched.

[0011] Optionally, the end of the second feed tube extending out of the accommodating cavity is provided with a fiber filament guide, a first fixing part and a connecting flange; the end extending into the accommodating cavity is provided with a fiber filament separating part and a second fixing part; the second feed tube is connected to the barrel through the connecting flange; the first fixing part is used to fix the fiber filament guide part on the second feed tube; the second fixing part is used to fix the fiber filament separating part on the second feed tube; the fiber filament guide part is provided with a plurality of first through holes for the fiber filaments to pass through; the fiber filament separating part is provided with a plurality of second through holes for the fiber filaments to pass through, and the center line of at least one second through hole is not arranged to coincide with the center line of the first through hole.

[0012] Optionally, the spiral mounting portion includes a first avoidance opening and a second avoidance opening for avoiding the cable of the first heating element, the first avoidance opening being connected to a cavity formed by an inner side surface of the first stirring shaft and an outer side surface of the second stirring shaft; the spiral mounting structure of the stirring blade is installed on the spiral mounting portion through the second avoidance opening; the stirring blade is also provided with a heating cavity for accommodating the first heating element, and the opening of the heating cavity is arranged toward the first stirring shaft.

[0013] Optionally, the spiral mounting part also includes a first fixing part and a second fixing part; the first fixing part and the second fixing part are respectively arranged on the side opposite to the second avoidance opening; the first avoidance opening, the second avoidance opening, the first fixing part and the second fixing part are surrounded to form a cross-shaped spiral mounting groove; the second avoidance opening, the first fixing part and the second fixing part are interference fit with the spiral mounting structure of the stirring blade.

[0014] Optionally, a plurality of sub-spiral grooves are provided on the inner side walls of the first fixing portion and the second fixing portion; a sealing assembly is provided on the spiral mounting structure, and the sub-spiral grooves are used for mounting the sealing assembly.

[0015] Optionally, the sealing assembly includes a first mounting member, a second mounting member and a plurality of sealing members; the sealing members are arranged in one-to-one correspondence with the sub-spiral grooves; one end of the plurality of first sealing members is connected to the first mounting member, and the other end is connected to the second mounting member.

[0016] Optionally, the second heating device also includes a first mounting plate, a second mounting plate, a driving motor, a screw, a screw nut and a guide member; the first mounting plate is arranged on the outside of the barrel, the second mounting plate is arranged on the first mounting plate, the driving motor is arranged on the first mounting plate, and the guide member is arranged on the second mounting plate; one end of the screw is connected to the driving motor, and the other end is rotatably connected to the second mounting plate; the heating plate is connected to the screw through the screw nut, and the heating plate is also slidably connected to the guide member; the driving motor is used to drive the screw to rotate, and then drive the heating plate to slide along the guide member to adjust the spacing between the heating plate and the nozzle in the axial direction of the barrel.

[0017] On the other hand, the present invention also provides a 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups, including a driving mechanism and a nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups as described above; the driving mechanism is used to drive the nozzle to move.

[0018] As described above, a nozzle and a 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups of the present invention have at least the following beneficial effects: the present invention arranges a second heating device on the outer wall of the barrel, and a first tooth-shaped heating structure is arranged on the side surface of the heating plate away from the barrel, and the spray channel is arranged in a square shape, and a first tooth-shaped structure is arranged on the side surface of the spray channel close to the forward direction of the nozzle, and a second tooth-shaped structure staggered with the first tooth-shaped structure is arranged on the side surface away from the forward direction of the nozzle; it is convenient for the heating device to heat the printed thermoplastic LCP fiber self-reinforced material strip, and also increases the contact area between the thermoplastic LCP fiber self-reinforced material to be printed and the printed thermoplastic LCP fiber self-reinforced material strip, ensuring that they can be fully fused and avoiding the generation of interlayer cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic structural diagram of a nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to the present invention.

[0020] Figure 2 Shown is a schematic cross-sectional view of a nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups of the present invention, partially cutting through a barrel.

[0021] Figure 3 Display as Figure 2 A local enlarged view of point A in the figure.

[0022] Figure 4 Shown is a schematic structural diagram of the nozzle of the present invention.

[0023] Figure 5 Shown is a schematic structural diagram of the stirring shaft assembly and stirring blades of the present invention.

[0024] Figure 6 It is a cross-sectional view showing the connection of the first stirring shaft, the second stirring shaft and the stirring blade of the present invention.

[0025] Figure 7 Display as Figure 6 A local enlarged view of point B in FIG.

[0026] Figure 8 It is a schematic structural diagram of the second stirring shaft and the second feeding pipe of the present invention.

[0027] Fig. 9 Display as Figure 8 A local enlarged view of point C in the figure.

[0028] Fig.10 It is a cross-sectional view of the fiber guide, the first fixing member and the second feeding tube after being connected according to the present invention.

[0029] Fig.11 It shows a cross-sectional view of the fiber filament separating member, the second fixing member and the second feeding tube after being connected to each other according to the present invention.

[0030] Fig.12 Shown is a schematic structural diagram of the first stirring shaft of the present invention.

[0031] Fig.13 Display as Fig.12 A local enlarged view of point D in FIG. DETAILED DESCRIPTION

[0032] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0034] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0035] See also Figure 1 , 2 The present invention provides a nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups, comprising: a barrel 1, a first feed pipe 2, a second feed pipe 7, a stirring device 3, a nozzle 4, a first heating device and a second heating device 6; a holding cavity for holding the thermoplastic LCP fiber self-reinforced material to be printed is arranged in the barrel 1, the first feed pipe 2 is connected to the holding cavity, and is used to transport the liquid crystal material into the holding cavity; the second feed pipe 7 is connected to the holding cavity, one end of which extends into the holding cavity, and the other end is located outside the holding cavity and connected to the barrel 1, and is used to transport the fiber filament 8 into the holding cavity; the stirring device 3 and the first heating device are at least partially arranged in the holding cavity, the stirring device 3 is used to stir the liquid crystal material in the holding cavity, and the first heating device is used to heat the liquid crystal material in the holding cavity; the nozzle 4 is arranged on the barrel 1 and is connected to the holding cavity; the fiber filament 8 and the heated liquid crystal The materials are mixed in the accommodating cavity to form a thermoplastic LCP fiber self-reinforced material to be printed; the second heating device 6 is arranged on the outer side of the barrel 1 facing the forward direction of the nozzle, and is used to heat the printed thermoplastic LCP fiber self-reinforced material; the spray channel of the nozzle 4 is square, and a first tooth-shaped structure 41 is arranged on the side surface of the spray channel close to the forward direction of the nozzle, and a second tooth-shaped structure 42 is arranged staggered with the first tooth-shaped structure 41 on the side surface away from the forward direction of the nozzle; the heating plate 61 of the second heating device 6 is provided with a first tooth-shaped heating structure 614 on the side surface away from the barrel 1; the heating plate 61 heats the printed thermoplastic LCP fiber self-reinforced material through the first tooth-shaped heating structure 614, so that the thermoplastic LCP fiber self-reinforced material to be printed sprayed out by the nozzle 4 is integrated with the printed thermoplastic LCP fiber self-reinforced material.

[0036] Specifically, the upper part of the barrel 1 is cylindrical, the lower part is conical, and the lower part is provided with a discharge port; the stirring device 3 and a part of the first heating device are located on the top plate of the upper part of the barrel 1, and the other part of the structure extends into the accommodating cavity of the barrel 1, and the first feeding pipe 2 is arranged on the side of the upper part of the barrel 1 and communicated with the accommodating cavity. The stirring device 3 continuously stirs the liquid crystal material to be treated, so that the first heating device can fully heat the liquid crystal material to form a molten liquid crystal material.

[0037] The nozzle 4 is arranged at the discharge port on the lower part of the barrel 1, and is used to spray the thermoplastic LCP fiber self-reinforced material to be printed to the outside, so as to print the thermoplastic LCP fiber self-reinforced material to form thermoplastic LCP fiber self-reinforced material stirrups. The spraying channel of the nozzle 4 is square, that is, it is square when viewed from the cross section of the spraying channel along the extension direction perpendicular to the nozzle 4. The first tooth-shaped structure 41 and the second tooth-shaped structure 42 are staggered along the extension direction of the spraying channel, that is, the groove formed between two adjacent teeth of the first tooth-shaped structure 41 corresponds to one of the teeth of the second tooth-shaped structure 42, and the groove formed between two adjacent teeth of the second tooth-shaped structure 42 corresponds to one of the teeth of the first tooth-shaped structure 41. In this embodiment, a plurality of first tooth-shaped structures 41 arranged at intervals are arranged on one side of the feed channel in the forward direction, and a plurality of second tooth-shaped structures 42 arranged at intervals are arranged on one side away from the forward direction, that is, the thermoplastic LCP fiber self-reinforced material to be printed ejected from the feed channel of the nozzle forms a printed thermoplastic LCP fiber self-reinforced material strip with the first tooth-shaped structure 41 and the second tooth-shaped structure 42. The first tooth-shaped heating structure 614 on the heating plate 61 is used to extend into the groove formed between adjacent teeth of the second tooth-shaped structure 42 on the top surface of the printed thermoplastic LCP fiber self-reinforced material strip, so that it can fully heat the top surface of the printed thermoplastic LCP fiber self-reinforced material strip. It is understandable that the heating plate 61 can be a plate-like structure provided with a plurality of heating wires, for example, a heating wire is provided on each tooth of the first tooth-shaped heating structure 614 of the heating plate 61, and a heating wire is provided at the bottom of the groove formed by the adjacent teeth of the first tooth-shaped heating structure 614. Of course, it can also be other structural forms, and this embodiment does not limit this, as long as it can heat the second tooth-shaped structure 42 of the printed thermoplastic LCP fiber self-reinforced material strip. In addition, in this embodiment, the thermoplastic LCP fiber self-reinforced material to be printed is formed by heating the liquid crystal material and then mixing the molten liquid crystal material and the fiber filament 8. Specifically, after the liquid crystal material is heated, during the process of being ejected from the nozzle 4, the molten liquid crystal material wraps the fiber filament 8, that is, a structure similar to the stirrups and concrete in the concrete structure is formed, so as to realize the role of the fiber filament 8 in enhancing the mechanical properties of the printed thermoplastic LCP fiber self-reinforced material. It can be understood that, in the present embodiment, the fiber filament 8 is a continuous and uninterrupted filament structure, and in other implementations, it can also be a discontinuous structure of small segments, which is not limited in the present embodiment.

[0038] During the 3D printing process, since the thermoplastic LCP fiber self-reinforced material sprayed out by the nozzle 4 is in strip shape, and during the printing process, the printed thermoplastic LCP fiber self-reinforced material strip gradually cools down, if the next strip of thermoplastic LCP fiber self-reinforced material is directly printed on the cooled thermoplastic LCP fiber self-reinforced material strip, the thermoplastic LCP fiber self-reinforced materials will not be fully fused, that is, interlayer cracks will be formed. Therefore, the present application utilizes the heating plate 61 of the second heating device 6 to heat the second tooth structure of the printed thermoplastic LCP fiber self-reinforced material strip in the forward direction of the nozzle 4. After heating, the nozzle 4 is used to cover the thermoplastic LCP fiber self-reinforced material to be printed on the printed thermoplastic LCP fiber self-reinforced material strip, that is, the first tooth structure of the thermoplastic LCP fiber self-reinforced material to be printed covers the second tooth structure of the printed thermoplastic LCP fiber self-reinforced material strip (similar to the method of gear meshing and then fixing by welding), so that the thermoplastic LCP fiber self-reinforced material to be printed and the printed thermoplastic LCP fiber self-reinforced material strip can be fully fused. By arranging the first tooth-shaped structure 41 and the second tooth-shaped structure 42 on the nozzle 4 and arranging the first tooth-shaped heating structure 614 on the heating plate 61 of the second heating device 6, on the one hand, the contact area between the heating plate 61 and the printed thermoplastic LCP fiber self-reinforced material strip is increased, thereby ensuring that the printed thermoplastic LCP fiber self-reinforced material can be sufficiently heated to facilitate subsequent fusion; on the other hand, the contact area between the thermoplastic LCP fiber self-reinforced material to be printed and the printed thermoplastic LCP fiber self-reinforced material strip can be increased (i.e., by utilizing the meshing action of the first tooth-shaped structure and the second tooth-shaped structure), ensuring that they can be fully fused and avoiding the occurrence of interlayer cracks.

[0039] like Figure 1-4As shown, in one embodiment, one of the two side surfaces of the spray channel of the nozzle 4 parallel to the forward direction of the nozzle 4 is provided with a first tooth-shaped structure 41, and the other is provided with a second tooth-shaped structure 42; correspondingly, the heating plate 61 is provided with a second tooth-shaped heating structure 615 on the side corresponding to the side provided with the first tooth-shaped heating structure 614, and the heating plate 61 is provided with a first tooth-shaped heating structure 614 on the side corresponding to the side provided with the second tooth-shaped structure 42. Specifically, the side surface of the nozzle 4 provided with the first tooth-shaped structure 41 may be the front side surface and the right side surface as shown in the figure, and the side surface provided with the second tooth-shaped structure 42 may be the rear side surface and the left side surface as shown in the figure, and correspondingly, the right side surface of the heating plate 61 is provided with the second tooth-shaped heating structure 615, and the left side surface of the heating plate 61 is provided with the first tooth-shaped heating structure 614. In this embodiment, tooth structures are provided on the four side walls of the spray channel, that is, tooth structures are formed around the printed thermoplastic LCP fiber self-reinforced material strips. Since a layer of stirrups can be printed in multiple times during the printing process of the 3D printer, that is, a layer of stirrups is composed of multiple thermoplastic LCP fiber self-reinforced material strips, in order to avoid conditional cracks, tooth structures are provided around each thermoplastic LCP fiber self-reinforced material strip, and during the printing process, the heating plate 61 is heated by the tooth structures provided on both sides thereof, to ensure that the thermoplastic LCP fiber self-reinforced material to be printed can be fully integrated with the printed thermoplastic LCP fiber self-reinforced material strips to avoid cracks between strips. In addition, since tooth structures are formed around the printed thermoplastic LCP fiber self-reinforced material strips, after the printing is completed, the outer side of the formed stirrups is also provided with tooth structures, and the tooth structures can increase the contact area with the concrete and increase the stability of the concrete structure.

[0040] In one embodiment, see Figure 3 The heating plate 61 includes an inclined section 611, a transition section 612 and a straight section 613. One end of the transition section 612 is connected to the inclined section 611, and the other end is connected to the straight section 613. The inclined section 611 is arranged away from the nozzle at one end of the transition section 612, and the opening direction of the angle formed between the straight section 613 and the inclined section 611 is arranged toward the barrel 1. Specifically, after the nozzle prints a layer of thermoplastic LCP fiber self-reinforced material strips, the nozzle moves upward relative to the horizontal plane to print the next layer of thermoplastic material strips. Therefore, an inclined connecting section is formed between the junctions of the two layers of thermoplastic LCP fiber self-reinforced material strips. Therefore, in order to adapt to the connecting section, the embodiment provides the inclined section 611, the transition section 612 and the straight section 613 on the heating plate 61, and the transition section 612 and the inclined section 611 are used to adapt to the connecting section to ensure that the heating plate 61 can heat the connecting section.

[0041] See also Figure 1 , 24. The stirring device 3 includes a stirring shaft assembly 31, a stirring motor 32 and a stirring blade 33; the stirring blade 33 is arranged on the stirring shaft assembly 31 and is located in the accommodating chamber; one end of the stirring shaft assembly 31 extends out of the accommodating chamber and is connected to the stirring motor 32; the first heating device includes a first heating element 51 and a second heating element 52, the first heating element 51 is arranged on the stirring blade 33; the second heating element 52 is arranged on the inner side wall of the accommodating chamber. The stirring motor 32 is arranged on the top plate of the barrel 1, and the stirring shaft assembly 31 is rotatably arranged on the top plate, one end of which extends into the accommodating chamber, and the other end extends out of the accommodating chamber and is connected to the stirring motor 32. The first heating element 51 and the second heating element 52 can be heating wires, the first heating element 51 is fixed on the stirring blade 33, and can also be fixed on the outer side of the stirring shaft assembly 31, and the second heating element 52 is fixed on the inner side wall of the accommodating chamber to heat the liquid crystal material. In this embodiment, a first heating element 51 is provided on the stirring shaft assembly 31 and the stirring blade 33, and a second heating element 52 is provided on the inner side wall of the accommodating chamber, so that the stirring shaft assembly 31 and the stirring blade 33 can stir the liquid crystal material on the one hand and heat the liquid crystal material on the other hand during the rotation process, thereby ensuring the uniformity of heating of the liquid crystal material. In an optional embodiment, a heat-insulating layer can also be provided on the outer side of the barrel 1 to keep the liquid crystal material in the accommodating chamber warm.

[0042] Please refer to 1-2, 5-8, the stirring shaft assembly 31 includes a first stirring shaft 311 and a second stirring shaft 312, the first stirring shaft 311 is a hollow shaft, and a transmission gear 34 is arranged at one end of the first stirring shaft 311 extending out of the accommodating chamber; a driving gear 36 is arranged on the transmission shaft of the stirring motor 32, and the driving gear 36 is meshed with the transmission gear 34; the second stirring shaft 312 is a hollow shaft, and the outer diameter of the second stirring shaft 312 is smaller than the inner diameter of the first stirring shaft 311; the end of the second stirring shaft 312 extending into the accommodating chamber is connected to the end of the first stirring shaft 311 extending into the accommodating chamber, and the first stirring shaft 311 is sleeved on the second stirring shaft 312; a spiral mounting portion 3111 for mounting a stirring blade 33 is arranged on the side wall of the end of the first stirring shaft 311 extending into the accommodating chamber, and the stirring blade 33 It is spiral-shaped, and the connecting end of the stirring blade 33 and the stirring shaft is a spiral mounting structure compatible with the spiral mounting portion 3111; the spiral mounting portion 3111 is used to fix the stirring blade 33 in the circumferential and radial directions of the stirring shaft; the second stirring shaft 312 is used to fix the stirring blade 33 in the axial direction of the first stirring shaft 311; one end of the second stirring shaft 312 extending out of the accommodating cavity is provided with a through-hole conductive slip ring 35, and the cable of the first heating element 51 is arranged in the cavity formed by the inner side surface of the first stirring shaft 311 and the outer side surface of the second stirring shaft 312, one end of the cable of the first heating element 51 is connected to the first heating element 51, and the other end is connected to the through-hole conductive slip ring 35; the second stirring shaft 312 is sleeved on the second feeding pipe 7, and the second stirring shaft 312 and the second feeding pipe 7 are clearance-matched.

[0043] Specifically, a mounting hole is provided on the top plate of the barrel 1, and a bearing is also sleeved on the first stirring shaft 311, and the first stirring shaft 311 is arranged in the mounting hole through the bearing. The outer side surface of the end of the first stirring shaft 311 extending into the accommodating cavity may be provided with a thread, and the end of the second stirring shaft 312 extending into the accommodating cavity is provided with a threaded connection portion, the threaded connection portion protrudes from the second stirring shaft 312, and a gap for accommodating the thread of the first stirring shaft 311 is formed between the threaded connection portion and the outer side surface of the second stirring shaft 312, and the thickness of the gap is greater than the thickness of the first stirring shaft 311, so that after the second stirring shaft 312 is threadedly connected to the first stirring shaft 311 through the threaded connection portion, a cavity for accommodating the cable of the first heating element 51 is formed between the first stirring shaft 311 and the second stirring shaft 312. When the second stirring shaft 312 is threadedly connected to the first stirring shaft 311, the second stirring shaft 312 abuts against the stirring blade 33, plays the role of sealing the spiral mounting portion 3111 and plays the role of positioning the stirring blade 33, thereby fixing the stirring blade 33 on the first stirring shaft 311 and preventing the molten liquid crystal material from entering the cavity formed between the first stirring shaft 311 and the second stirring shaft 312. The end of the second stirring shaft 312 extending out of the accommodating cavity is connected to the through-hole conductive slip ring 35, and the cable of the first heating element 51 is connected to the through-hole conductive slip ring 35, which is then connected to the power supply to transmit power to the first heating element 51. Due to the setting of the through-hole wire slip ring, the rotation of the first stirring shaft 311 and the second stirring shaft 312 will not cause the cable of the first heating element 51 to be entangled. The second feeding pipe 7 and the second stirring shaft 312 are clearance-matched, that is, the rotation of the first stirring shaft 311 and the second stirring shaft 312 will not drive the second feeding pipe 7 to rotate.

[0044] See also Figure 8-11, the end of the second feed tube 7 extending out of the accommodating cavity is provided with a fiber guide 71, a first fixing member 72 and a connecting flange 73; the end extending into the accommodating cavity is provided with a fiber separator 74 and a second fixing member 75; the second feed tube 7 is connected to the barrel 1 through the connecting flange 73; the first fixing member 72 is used to fix the fiber guide 71 on the second feed tube 7; the second fixing member 75 is used to fix the fiber separator 74 on the second feed tube 7; the fiber guide 71 is provided with a plurality of first through holes for the fiber 8 to pass through; the fiber separator 74 is provided with a plurality of second through holes 741 for the fiber 8 to pass through, and the center line of at least one second through hole 741 is not overlapped with the center line of the first through hole. Specifically, the fiber guide 71 can be a cylindrical structure provided with a plurality of first through holes, and the outer diameter of the fiber guide 71 is less than or equal to the outer diameter of the second feed tube 7, and greater than the inner diameter of the second feed tube 7. The first fixing member 72 is a hollow cylindrical structure, and an internal thread is provided on the inner side surface of the first fixing member 72, and an external thread is provided on the outer side surface of the end of the second feed pipe 7 extending out of the accommodating cavity, and the first fixing member 72 and the second feed pipe 7 are connected by threads. The first fixing member 72 is also provided with a circular abutment portion, which protrudes from the inner side surface of the first fixing member 72, and the inner diameter of the circular abutment portion is greater than or equal to the aperture of the second feed pipe 7, and less than or equal to the outer diameter of the second feed pipe 7. The abutment portion is used to abut against the end of the fiber filament guide 71 away from the second feed pipe 7, and is used to fix the fiber filament guide 71 to the second feed pipe 7.

[0045] The fiber filament separator 74 is provided with a plurality of second through holes 741 for the fiber filaments 8 to pass through, and the second through holes 741 and the first through holes can be arranged one by one. The center line of at least one second through hole 741 is arranged non-coincidentally with the center line of the first through hole, specifically, the center line of the second through hole 741 located on the center line of the fiber filament separator 74 can coincide with the center line of the first through hole arranged on the center line of the fiber filament guide 71, and the center lines of the remaining second through holes 741 and the center lines of the first through holes arranged on the fiber filament guide 71 are all arranged non-coincidentally, so that the fiber filaments 8 are arranged in a divergent shape in the accommodating cavity, so as to evenly space the fiber filaments 8 in the thermoplastic LCP fiber self-reinforced material ejected from the nozzle 4, thereby enhancing the mechanical properties of the thermoplastic LCP fiber self-reinforced material. The shape of the fiber filament separator 74 close to the second feed pipe 7 and the end away from the second feed pipe 7 can be a conical structure, and the connecting end between the two ends is a cylindrical structure, and the conical structure is convenient for guiding the flow of the liquid crystal material.

[0046] The outer side surface of the end of the second feed pipe 7 extending into the accommodating cavity is ringed with a groove; a limiting step 742 is provided at the end of the fiber filament separating member 74 away from the second feed pipe 7; the second fixing member 75 includes a second fixing sub-member A751 and a second fixing sub-member B752, and the second fixing sub-member A751 and the second fixing sub-member B752 are respectively a first cylindrical connecting section 753, a trumpet-shaped connecting section 754 and a second cylindrical connecting section 755 from the connection end for connecting with the first feed pipe 2 to the end away from the second feed pipe 7; the inner side surface of the first cylindrical connecting end is provided with a first protrusion 7531 for engaging with the groove and the outer side surface is provided with a first mounting member 7532; the small end of the trumpet-shaped connecting section 754 is arranged toward the first cylindrical connecting section 753, and the large end is arranged toward the second cylindrical connecting section 755; the inner side surface of the second cylindrical connecting section 755 is provided with a second protrusion 7551 for connecting with the limiting step 742. The first mounting member 7532 is a plate-like structure, one end of which is fixedly connected to the second fixing member A751 or the second fixing member B752, and the other end is provided with a through hole. The second fixing member 751A and the first mounting member 7532 of the second fixing member B752 can be connected together by means of bolts to form a clamp structure. Specifically, a screw rod passes through the through holes of the two first mounting members 7532, and then nuts are fixed at both ends of the screw rod respectively, thereby realizing the connection between the second fixing member A751 and the second fixing member B751. When in use, the trumpet-shaped connecting sections 754 of the first fixing component A and the second fixing component B751 are respectively abutted against the outer side surfaces of the conical structure of the fiber filament separating component 74 close to the second feeding tube 7, the second protrusion 7551 is connected to the limiting step 742, and then the first protrusion 7531 is used to engage with the slot of the second feeding tube 7, and finally the first mounting component 7532 of the second fixing component A751 and the first mounting component 7532 of the second fixing component B751 are abutted, and then the second fixing component A751 and the second fixing component B751 are fixed together by bolt connection, so as to fix the second fixing component 75 and the fiber filament separating component 74 on the second feeding tube 7.

[0047] See also Fig.12 , 13, the spiral mounting portion 3111 includes a first avoidance opening 31111 and a second avoidance opening 31112 for avoiding the cable of the first heating element 51, and the first avoidance opening 31111 is connected to the cavity of the stirring shaft; the spiral mounting structure of the stirring blade 33 is installed on the spiral mounting portion 3111 through the second avoidance opening 31112; the stirring blade 33 is also provided with a heating chamber for accommodating the first heating element 51, and the opening of the heating chamber is arranged toward the stirring shaft. In this embodiment, the stirring blade 33 is a spiral blade, which is spirally arranged in the axial direction of the stirring shaft. On the one hand, it is used to stir the thermoplastic LCP fiber self-reinforced material to be printed, and on the other hand, it can also guide the thermoplastic LCP fiber self-reinforced material to converge toward the discharge port of the barrel 1 so as to be sprayed out through the nozzle 4. The opening of the heating chamber of the stirring blade 33 is arranged toward the stirring shaft, and specifically, the heating chamber can pass through the spiral mounting structure of the stirring blade 33, thereby first facilitating the installation of the first heating element 51 into the heating chamber.

[0048] The spiral mounting portion 3111 also includes a first fixing portion 31113 and a second fixing portion 31114; the first fixing portion 31113 and the second fixing portion 31114 are respectively arranged on the side opposite to the second avoidance opening 31112; the first avoidance opening 31111, the second avoidance opening 31112, the first fixing portion and the second fixing portion 31114 are enclosed to form a cross-shaped spiral mounting groove; the second avoidance opening 31112, the first fixing portion 31113 and the second fixing portion 31114 are interference-fitted with the spiral mounting structure of the stirring blade 33. The spiral mounting structure is adapted to the structure of the spiral mounting portion 3111, that is, a cross-shaped spiral mounting structure, and the second avoidance opening 31112, the first fixing portion 31113 and the second fixing portion 31114 are interference-fitted with the spiral mounting structure of the stirring blade 33, ensuring that the stirring blade 33 can be stably mounted on the stirring shaft to prevent the thermoplastic LCP fiber self-reinforced material to be printed from entering the cavity of the stirring shaft.

[0049] A plurality of sub-spiral grooves 31115 are provided on the inner side walls of the first fixing portion 31113 and the second fixing portion 31114; a sealing member is provided on the spiral mounting structure, and the sub-spiral grooves 31115 are used to install the sealing member. Four sub-spiral grooves 31115 may be provided, and two sub-spiral grooves 31115 are provided on the first fixing portion 31113 and the second fixing portion 31114, respectively. The two sub-spiral grooves 31115 are respectively provided on one of the two opposite sides of the first fixing portion 31113 or the second fixing portion 31114. The sealing member may be made of an elastically deformable material, and its shape is adapted to the shape of the sub-spiral groove 31115. For example, when the cross-sectional shape of the sub-spiral groove 31115 is circular, the sealing member is also circular and can be placed in the sub-spiral groove 31115 to achieve sealing.

[0050] See also Figure 1The second heating device 6 also includes a first mounting plate 62, a second mounting plate 63, a driving motor 64, a screw 65, a screw 65 nut and a guide member 66; the first mounting plate 62 is arranged on the outer side of the barrel 1, the second mounting plate 63 is arranged on the first mounting plate 62, the driving motor 64 is arranged on the first mounting plate 62, and the guide member 66 is arranged on the second mounting plate 63; one end of the screw 65 is connected to the driving motor 64, and the other end is rotatably connected to the second mounting plate 63; the heating plate 61 is connected to the screw 65 through the screw 65 nut, and the heating plate 61 is also slidably connected to the guide member 66; the driving motor 64 is used to drive the screw 65 to rotate, and then drive the heating plate 61 to slide along the guide member 66 to adjust the axial distance between the heating plate 61 and the nozzle in the barrel 1. Specifically, the second mounting plate 63 is vertically mounted on the first mounting plate 62, and the transmission shaft of the driving motor 64 can pass through the first mounting plate 62 to be connected to the screw rod 65; the guide member 66 can be a guide rail, and a screw rod 65 nut is provided at the connection between the heating plate 61 and the screw rod 65, that is, by utilizing the action of the screw rod 65 nut, the rotation of the screw rod 65 is converted into the sliding movement of the heating member along the guide member 66. It can be understood that when printing different stirrups, the thickness of the thermoplastic LCP fiber self-reinforced material to be printed sprayed out by the nozzle 4 will change according to the size and shape of the stirrups. Specifically, the size of the feed channel of the nozzle 4 can be changed, for example, by replacing the nozzle 4 or directly adjusting the aperture size of the feed channel of the nozzle 4. If the size of the feed channel changes, the thickness of each layer of the printed thermoplastic LCP fiber self-reinforced material strip will be different. Therefore, this embodiment will adjust the axial distance between the heating plate 61 and the nozzle in the barrel 1 by driving the motor 64 and the screw 65, so that the heating plate 61 can adapt to the printed thermoplastic LCP fiber self-reinforced material strips of different thicknesses.

[0051] Another aspect of the present invention provides a 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups, comprising a feed barrel, a drive mechanism, and a nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups as described above; one end of a first feed pipe 2 is connected to the feed barrel, and the other end is connected to a barrel 1, for transferring the thermoplastic LCP fiber self-reinforced material to be printed in the feed barrel to the barrel 1; the drive mechanism is used to drive the nozzle to move. The drive mechanism can drive the nozzle to move in a direction parallel to the horizontal plane, and can also drive the nozzle to move in a direction perpendicular to the horizontal plane.

[0052] In summary, the present invention provides a second heating device 6 on the outer wall of the barrel 1, and a first tooth-shaped heating structure 614 is provided on the side surface of the heating plate 61 away from the barrel 1, and the spray channel is set to a square shape, and a first tooth-shaped structure 41 is provided on the side surface of the spray channel close to the forward direction of the nozzle, and a second tooth-shaped structure 42 staggered with the first tooth-shaped structure 41 is provided on the side surface away from the forward direction of the nozzle; it is convenient for the heating device to heat the printed thermoplastic LCP fiber self-reinforced material strip, and also increases the contact area between the thermoplastic LCP fiber self-reinforced material to be printed and the printed thermoplastic LCP fiber self-reinforced material strip, ensuring that they can be fully fused and avoiding interlayer cracks. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0053] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups, characterized in that: include: A barrel, a first feed pipe, a second feed pipe, a stirring device, a nozzle, a first heating device and a second heating device; The barrel is provided with a receiving cavity for receiving the thermoplastic LCP fiber self-reinforced material to be printed, the first feeding pipe is connected to the receiving cavity, and is used to deliver the liquid crystal material into the receiving cavity; the second feeding pipe is connected to the receiving cavity, one end of which extends into the receiving cavity, and the other end is located outside the receiving cavity and connected to the barrel, and is used to deliver the fiber filaments into the receiving cavity; The stirring device and the first heating device are at least partially arranged in the accommodating cavity, the stirring device is used to stir the liquid crystal material in the accommodating cavity, and the first heating device is used to heat the liquid crystal material in the accommodating cavity; the fiber filaments and the heated liquid crystal material are mixed in the accommodating cavity to form a thermoplastic LCP fiber self-reinforced material to be printed; The nozzle is arranged on the barrel and connected to the accommodating chamber; The second heating device is arranged on the outer side of the barrel in the direction of the nozzle, and is used to heat the printed thermoplastic LCP fiber self-reinforced material; The spray channel of the nozzle is square, and a first tooth-shaped structure is arranged on a side surface of the spray channel close to the forward direction of the nozzle, and a second tooth-shaped structure staggered with the first tooth-shaped structure is arranged on a side surface away from the forward direction of the nozzle; a first tooth-shaped heating structure is arranged on a side surface of the heating plate of the second heating device away from the barrel; the heating plate heats the printed thermoplastic LCP fiber self-reinforced material through the first tooth-shaped heating structure, so as to facilitate the fusion of the thermoplastic LCP fiber self-reinforced material to be printed sprayed out of the nozzle with the printed thermoplastic LCP fiber self-reinforced material.

2. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 1, characterized in that: One of the two side surfaces of the spray channel of the nozzle parallel to the forward direction of the nozzle is provided with a first tooth-shaped structure, and the other is provided with a second tooth-shaped structure; the second tooth-shaped heating structure is provided on the side of the heating plate corresponding to the side provided with the first tooth-shaped structure, and the first tooth-shaped heating structure is provided on the side of the heating plate corresponding to the side provided with the second tooth-shaped structure.

3. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 2, characterized in that: The heating plate includes an inclined section, a transition section and a straight section, one end of the transition section is connected to the inclined section, and the other end is connected to the straight section; the end of the inclined section away from the transition section is arranged away from the nozzle, and the opening direction of the angle formed between the straight section and the inclined section is arranged toward the barrel.

4. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 1 or 2, characterized in that: The stirring device comprises a stirring shaft assembly, a stirring motor and a stirring blade; the stirring blade is arranged on the stirring shaft assembly and is located in the accommodating cavity; one end of the stirring shaft assembly extends out of the accommodating cavity and is connected to the stirring motor; The first heating device includes a first heating element and a second heating element. The first heating element is arranged on the stirring blade; the second heating element is arranged on the inner side wall of the accommodating cavity.

5. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 4, characterized in that: The stirring shaft assembly comprises a first stirring shaft and a second stirring shaft, the first stirring shaft is a hollow shaft, and a transmission gear is arranged at one end of the first stirring shaft extending out of the accommodating cavity; a driving gear is arranged on the transmission shaft of the stirring motor, and the driving gear is meshed with the transmission gear; The second stirring shaft is a hollow shaft, and the outer diameter of the second stirring shaft is smaller than the inner diameter of the first stirring shaft; One end of the second stirring shaft extending into the accommodating cavity is connected to one end of the first stirring shaft extending into the accommodating cavity, and the first stirring shaft is sleeved on the second stirring shaft; A spiral mounting portion for mounting the stirring blade is provided on the side wall of one end of the first stirring shaft extending into the accommodating cavity, the stirring blade is spiral-shaped, and the connecting end of the stirring blade and the stirring shaft is a spiral mounting structure adapted to the spiral mounting portion; the spiral mounting portion is used to fix the stirring blade in the circumferential and radial directions of the stirring shaft; the second stirring shaft is used to fix the stirring blade in the axial direction of the first stirring shaft; A through-hole conductive slip ring is provided at one end of the second stirring shaft extending out of the accommodating cavity, and a cable of the first heating element is provided in a cavity formed by an inner side surface of the first stirring shaft and an outer side surface of the second stirring shaft, and one end of the cable of the first heating element is connected to the first heating element, and the other end is connected to the through-hole conductive slip ring; The second stirring shaft is sleeved on the second feeding pipe, and the second stirring shaft and the second feeding pipe are clearance-matched.

6. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 5, characterized in that: The end of the second feed pipe extending out of the accommodating cavity is provided with a fiber guide, a first fixing member and a connecting flange; the end extending into the accommodating cavity is provided with a fiber separation member and a second fixing member; The second feed pipe is connected to the barrel via a connecting flange; the first fixing member is used to fix the fiber guide member on the second feed pipe; the second fixing member is used to fix the fiber separation member on the second feed pipe; The fiber guide is provided with a plurality of first through holes for fiber filaments to pass through; the fiber separator is provided with a plurality of second through holes for fiber filaments to pass through, and the center line of at least one of the second through holes is not overlapped with the center line of the first through hole.

7. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 5, characterized in that: The spiral mounting portion comprises a first avoidance opening and a second avoidance opening for avoiding the first heating element cable, the first avoidance opening being in communication with a cavity formed by an inner side surface of the first stirring shaft and an outer side surface of the second stirring shaft; the spiral mounting structure of the stirring blade is mounted on the spiral mounting portion through the second avoidance opening; The stirring blade is further provided with a heating cavity for accommodating the first heating element, and the opening of the heating cavity is arranged toward the first stirring shaft.

8. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 7, characterized in that: The spiral mounting portion further includes a first fixing portion and a second fixing portion; the first fixing portion and the second fixing portion are respectively arranged on a side opposite to the second avoidance opening; the first avoidance opening, the second avoidance opening, the first fixing portion and the second fixing portion enclose a cross-shaped spiral mounting groove; the second avoidance opening, the first fixing portion and the second fixing portion are interference-fitted with the spiral mounting structure of the stirring blade; A plurality of sub-spiral grooves are arranged on the inner side walls of the first fixing portion and the second fixing portion; a sealing member is arranged on the spiral mounting structure, and the sub-spiral grooves are used for mounting the sealing member.

9. A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups according to claim 1 or 2, characterized in that: The second heating device also includes a first mounting plate, a second mounting plate, a driving motor, a screw, a screw nut and a guide member; the first mounting plate is arranged on the outer side of the barrel, the second mounting plate is arranged on the first mounting plate, the driving motor is arranged on the first mounting plate, and the guide member is arranged on the second mounting plate; one end of the screw is connected to the driving motor, and the other end is rotatably connected to the second mounting plate; the heating plate is connected to the screw through the screw nut, and the heating plate is also slidably connected to the guide member; the driving motor is used to drive the screw to rotate, and then drive the heating plate to slide along the guide member to adjust the spacing between the heating plate and the nozzle in the axial direction of the barrel.

10. A 3D printer for printing thermoplastic LCP fiber self-reinforced material stirrups, characterized in that: A nozzle for printing thermoplastic LCP fiber self-reinforced material stirrups comprising a driving mechanism and any one of claims 1 to 9; The driving mechanism is used to drive the spray head to move.

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