3D printing piezoelectric nozzle color spraying device

Abstract

This invention relates to the field of piezoelectric printhead ink supply technology and discloses a 3D printing piezoelectric printhead ink spraying device, including a piezoelectric printhead body. The ink inlet of the piezoelectric printhead body is connected to the ink supply tube via a connecting part. The connecting part includes a connector connected to the ink inlet and the ink supply tube. Two connectors are connected by a mating part. The mating part adopts a three-section design, consisting of two symmetrically arranged tubes and a corrugated part connecting the two tubes. This 3D printing piezoelectric printhead ink spraying device can effectively solve the problems in the prior art, where conventional connection methods mostly use rigid threads or snap-fit ​​structures, and the sealing form is mainly a single annular plane mating. During disassembly and reassembly, the sealing surface is prone to micro-misalignment, which can easily lead to ink micro-leakage after long-term use. In addition, the high-frequency movement of the piezoelectric printhead during 3D printing generates vibration, which accelerates the wear of the sealing parts and, in severe cases, directly leads to seal failure.

Description

Technical Field

[0001] This invention relates to the field of piezoelectric printhead ink supply technology, specifically to a 3D printing piezoelectric printhead ink spraying device. Background Technology

[0002] In the field of 3D printing, piezoelectric nozzles, as a high-precision liquid jetting device, are widely used due to their non-contact jetting characteristics and high controllability of droplet size. Their core working principle is based on the inverse piezoelectric effect of piezoelectric ceramics: when a specific electrical signal is applied, the piezoelectric ceramics undergo regular mechanical deformation, which acts on the ink chamber through connected gaskets, causing the chamber volume to shrink. The ink inside is compressed, and the pressure is transmitted along the flow channel to the nozzle, ultimately being ejected in the form of ink droplets.

[0003] The connection between the piezoelectric printhead and the ink supply tube is a core component of fluid transport in an inkjet system, and its structural design and operating status directly determine printhead performance and ink stability. Currently, the connection between the two is mostly achieved through threaded or assembly-type connections, which presents significant technical limitations in 3D printing scenarios involving high-viscosity inks containing particles.

[0004] Specifically, conventional connection methods mostly use rigid threads or snap-fit ​​structures, and the sealing form is mainly a single annular plane butt joint. When disassembling and reassembling, the sealing surface is prone to micro-misalignment, resulting in uneven distribution of sealing pressure. After long-term use, it is easy to cause micro-ink leakage. In addition, the high-frequency movement of the piezoelectric nozzle during 3D printing will generate vibration, causing displacement stress at the connection. The tensile force generated by the rigid connection will accelerate the wear of the seal, and in severe cases, it will directly lead to seal failure. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a 3D printing piezoelectric nozzle ink spraying device. This device effectively solves the problems of conventional connections using rigid threads or snap-fit ​​structures, with sealing primarily based on a single annular plane butt joint. During disassembly and reassembly, micro-misalignment of the sealing surface easily occurs, leading to uneven sealing pressure distribution and potential ink micro-leakage after prolonged use. Furthermore, the high-frequency movement of the piezoelectric nozzle during 3D printing generates vibrations, causing displacement stress at the connection point. The tensile force generated by the rigid connection accelerates seal wear, potentially leading to seal failure in severe cases.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a 3D printing piezoelectric nozzle ink spraying device, comprising:

[0008] The piezoelectric printhead body has an ink inlet connected to an ink supply tube via a connector.

[0009] The connecting part includes a connector connected to the ink inlet and the ink supply tube. The two connectors are connected by a mating part. The mating part adopts a three-section design, consisting of two symmetrically arranged tubes and a corrugated part connecting the two tubes.

[0010] The inner wall of the tube and the outer wall of the connector are both provided with alignment components to assist in their docking. The corrugated part is provided with a heating component for controlling the ink temperature. The corrugated part is connected to a mixing component that rotates with the ink flow. When the mixing component rotates, it stirs the ink flow inside the corrugated part, increasing the fluidity of the ink and improving the heating rate of the heating component.

[0011] Furthermore, the connector includes a short tube with a countersunk hole on its inner wall. The short tube is slidably connected in the countersunk hole, and the connection between the two is sealed by a sealing ring. The other ends of the two short tubes are detachably connected to the ink inlet and the ink supply tube respectively in the same way by threads and sealing rings.

[0012] Furthermore, the bottom of the countersunk hole adopts a gradient design, with its depth gradually increasing from the inside to the outside along the radial direction of the pipe. The end of the sealing ring near the corrugated part adopts the same gradient design as the countersunk hole.

[0013] Furthermore, the alignment component includes guide grooves, and guide grooves are evenly provided on the outer wall of the short pipe. The end of the guide groove near the corrugated part is a straight section with an open design, and the end of the guide groove away from the corrugated part is an inclined section connected to the straight section. Slider blocks are evenly fixedly connected to the inner wall of the pipe fitting. The sliders correspond one-to-one with the guide grooves, and the corresponding sliders and guide grooves are slidably connected. A locking module is connected to both the short pipe and the pipe fitting.

[0014] Furthermore, the locking module includes locking blocks, adjacent locking blocks are uniformly fixedly connected to the outer wall of the short pipe and misaligned with the guide groove, and the pipe is provided with a clearance groove to avoid interference when the locking blocks rotate. The end of the locking block near the corrugated part is provided with a through-hole, and a locking ring that matches the locking hole is rotatably connected to the pipe. The inner wall of the locking ring is uniformly fixedly connected with a locking rod that matches the locking hole.

[0015] Furthermore, the heating component includes a thermally conductive pad, which is flexible and adheres to the outer surface of the corrugated part. The corrugated part is also connected to a temperature control central module that is connected to the thermally conductive pad and causes the thermally conductive pad to heat up.

[0016] Furthermore, the two ends of the corrugated component are symmetrically fixedly connected with annular plates, and the two annular plates are connected by springs.

[0017] Furthermore, the mixing assembly includes a rotating seat, two of which are symmetrically rotatably connected inside the corrugated component. The outer circumferential surface of the rotating seat is provided with a flow guide groove that flows with the fluid. The flow guide groove is composed of a straight section and an inclined section that are connected vertically, and the two inclined sections are inclined in opposite directions. An outwardly expanding blade is fixedly connected to the lower center of the upper rotating seat, and an inwardly folding blade is uniformly fixedly connected to the upper edge of the lower rotating seat.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] 1. Conventional connection methods often use rigid threads or snaps. When the piezoelectric nozzle moves at high frequency or changes in temperature, displacement stress is easily generated, which leads to rigid tension accelerating the wear of the seals and even seal failure. In this invention, the corrugated part of the mating part has the ability to extend and contract axially and swing slightly radially. It can automatically offset the displacement stress generated by the movement or temperature change of the piezoelectric nozzle body, avoid damage to the sealing ring and other seals by rigid tension. At the same time, the flexibility of the corrugated part reduces the impact of vibration on the connection node, significantly extends the service life of the seals, and ensures the sealing stability during long-term use.

[0020] 2. Conventional connections rely on "blind assembly," and during disassembly and reinstallation, operational deviations can easily lead to slight misalignment of the sealing surface, resulting in uneven distribution of sealing pressure and causing minor ink leakage. In this invention, precise alignment is achieved through an alignment component: the guide groove on the outer wall of the short tube and the slider on the inner wall of the fitting cooperate one by one to ensure coaxiality during connection. The locking module further fixes the position and prevents loosening after installation. This design fundamentally solves the misalignment problem of conventional "blind assembly," ensures complete fit of the sealing surface, and improves connection accuracy and reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram showing the separation structure of the piezoelectric printhead body, connecting part, and ink supply tube according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the connecting part according to an embodiment of the present invention;

[0025] Figure 4This is a schematic diagram of the separation structure of the connecting part in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the locking module according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the separation structure of the docking component and the mixing assembly in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the mixing component according to an embodiment of the present invention.

[0029] The labels in the diagram represent: 1. Piezoelectric printhead body; 11. Ink inlet; 2. Connecting part; 21. Connector; 211. Short tube; 212. Sealing ring; 22. Connecting part; 221. Tube fitting; 2211. Countersunk hole; 2212. Relief groove; 222. Corrugated part; 23. Alignment assembly; 231. Guide groove; 232. Slider; 233. Locking module; 2331. Locking block; 2332. Locking hole; 2333. Locking ring; 2334. Locking rod; 24. Heating assembly; 241. Thermal pad; 242. Temperature control center module; 25. Mixing assembly; 251. Rotary seat; 252. Guide groove; 253. Outward expansion blade; 254. Inward folding blade; 26. Annular plate; 27. Spring; 3. Ink supply tube. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to embodiments.

[0032] Example:

[0033] Please see Figures 1-3 This invention provides a technical solution: a 3D printing piezoelectric nozzle ink spraying device, comprising:

[0034] The piezoelectric printhead body 1 has an ink inlet 11 connected to the ink supply tube 3 via a connecting part 2.

[0035] The connecting part 2 includes a connector 21 connected to the ink inlet 11 and the ink supply tube 3. The two connectors 21 are connected by a connecting part 22. The connecting part 22 adopts a three-section design, consisting of two symmetrically arranged tubes 221 and a corrugated part 222 connecting the two tubes 221.

[0036] The inner wall of the tube 221 and the outer wall of the connector 21 are both provided with an alignment component 23 to assist in their docking. The corrugated part 222 is provided with a heating component 24 for controlling the ink temperature. The corrugated part 222 is connected to a mixing component 25 that rotates with the ink flow. When the mixing component 25 rotates, it stirs the ink flow inside the corrugated part 222, increasing the fluidity of the ink and improving the heating rate of the heating component 24.

[0037] Specifically, in the conventional connection structure between the piezoelectric printhead and the ink supply tube 3, assembly is mostly achieved by rigid threads or snaps. However, this connection method is prone to installation errors due to operational deviations during reinstallation after disassembly and cleaning. Once errors exist, not only will the sealing surface be misaligned, but also the equipment may experience problems such as seal failure or loosening due to vibration or thermal expansion and contraction during operation, which will seriously affect the stable operation of the equipment.

[0038] This embodiment addresses the aforementioned issues by optimizing the connection structure and installation process. During installation, the two connectors 21 are first connected to the ink inlet 11 and the ink supply tube 3, respectively. Then, the two connectors 21 are connected via the docking part 22. The connector 21 adopts a three-section design, and its corrugated part 222 has the ability to perform micro-extension along the axial direction and micro-oscillation along the radial direction. This characteristic can automatically offset the displacement stress caused by the movement of the piezoelectric printhead body 1 or by temperature changes, thereby effectively avoiding wear caused by rigid tension on the seal and ensuring the durability of the sealing performance.

[0039] To further improve connection accuracy, an alignment component 23 is provided between the connector 21 and the pipe fitting 221. The alignment component 23 can ensure precise coaxial docking during the connection process, fundamentally solving the problem of misalignment of the seals that is easily caused by the "blind installation" operation in conventional connection methods.

[0040] In addition, conventional connection structures can only serve as ink delivery channels and cannot interfere with the state of the ink. High-viscosity inks such as UV inks and ceramic slurries commonly used in 3D printing are prone to stagnation at the connection points during delivery and will experience a decrease in fluidity due to cooling, which in turn affects the jetting accuracy. In this embodiment, the mixing component 25 is used to make the ink flowing through the corrugated part 222 form a circulating vortex inside it during delivery.

[0041] This design not only increases the fluidity of the ink and effectively prevents ink from depositing on the inner wall of the corrugated part 222, reducing the risk of clogging; at the same time, it improves the uniformity of ink heating through forced convection, avoiding the state difference between the inner and outer ink layers caused by uneven heating.

[0042] See Figure 2 - Figure 4 The connector 21 includes a short tube 211. The inner wall of the tube 221 has a countersunk hole 2211. The short tube 211 is slidably connected in the countersunk hole 2211. The connection between the two is sealed by a sealing ring 212. The end of the short tube 211 away from the corrugated part 222 also has a countersunk hole 2211. The inner wall of the countersunk hole 2211 in the short tube 211 has a thread. The ends of the two short tubes 211 away from the corrugated part 222 are detachably connected to the ink inlet 11 and the ink supply tube 3 by the thread and the sealing ring 212.

[0043] The bottom of the countersunk hole 2211 adopts a gradient design, and its depth gradually increases from the inside to the outside along the radial direction of the pipe 221. The end of the sealing ring 212 near the corrugated part 222 adopts the same gradient design as the countersunk hole 2211.

[0044] Specifically, the connection method between the short tube 211 and the ink inlet 11 and the ink supply tube 3 is the same. Taking the connection with the ink inlet 11 as an example, the operation process is as follows: First, put the corresponding sealing ring 212 into the countersunk hole 2211 on the short tube 211, and then rotate the short tube 211 to achieve a sealed connection between the short tube 211 and the ink inlet 11 by means of the thread structure.

[0045] In this connection process, the gradient design of the countersunk hole 2211 on the short tube 211 plays a key guiding role, which can correct the coaxiality between the short tube 211 and the ink inlet 11, ensuring that the two maintain a good concentric state when connected. At the same time, the depth of the countersunk hole 2211 increases radially from the inside to the outside. When combined with the sealing ring 212 with the same angle gradient design, the sealing pressure will form a gradient distribution radially, that is, the inner side achieves low-pressure sealing, while the outer side is strengthened by high pressure. When high-viscosity ink is delivered in a high-pressure manner, the greater contact pressure on the outer side can effectively prevent ink leakage and ensure the sealing of the delivery process.

[0046] See Figure 4 and Figure 5 The alignment component 23 includes a guide groove 231. The outer wall of the short tube 211 is uniformly provided with guide grooves 231. The end of the guide groove 231 near the corrugated part 222 is a straight section and adopts an open design. The end of the guide groove 231 away from the corrugated part 222 is an inclined section and communicates with the straight section. The inner wall of the tube 221 is uniformly fixedly connected with sliders 232. The sliders 232 correspond one-to-one with the guide grooves 231, and the corresponding sliders 232 and guide grooves 231 are slidably connected. The short tube 211 and the tube 221 are jointly connected with a locking module 233.

[0047] The locking module 233 includes locking blocks 2331. Adjacent locking blocks 2331 are uniformly and fixedly connected to the outer wall of the short pipe 211 and are offset from the guide groove 231. The pipe fitting 221 has a clearance groove 2212 to avoid interference when the locking blocks 2331 rotate. The end of the locking block 2331 near the corrugated part 222 has a through-hole 2332. A locking ring 2333 is rotatably connected to the pipe fitting 221. The inner wall of the locking ring 2333 is uniformly and fixedly connected to a locking rod 2334 that matches the locking hole 2332.

[0048] Specifically, after the two short tubes 211 are connected to the ink inlet 11 and the ink supply tube 3 respectively, the two need to be connected through two symmetrically distributed tubes 221 in the connecting piece 22. The specific operation process is as follows:

[0049] First, align the slider 232 on the outer wall of one of the tube fittings 221 with the opening of the guide groove 231 on the outer wall of the short tube 211 connected to the ink inlet 11. Press the tube fitting 221 to make the slider 232 slide along the guide groove 231. Then, rotate the locking ring 2333 to insert the locking rod 2334 into the locking hole 2332, thereby completing the limiting and locking of the locking block 2331 and the short tube 211. Next, lock the other tube fitting 221 to the short tube 211 connected to the ink supply tube 3 in the same way.

[0050] During this process, the straight section of the guide groove 231 serves as a guide, while the inclined section is responsible for positioning. The two work together to achieve quick locking. When disassembling, only the locking ring 2333 needs to be rotated in the opposite direction, without the need for tools. At the same time, the precise fit between the guide groove 231 and the slider 232 ensures the coaxiality of the connection, effectively avoiding pressure fluctuations caused by eccentricity and ensuring the stability of the ink supply pressure.

[0051] See Figure 4 The heating component 24 includes a heat-conducting pad 241, which is flexible and attached to the outer surface of the corrugated component 222. The corrugated component 222 is also connected to a temperature control central module 242 for controlling the heating of the heat-conducting pad 241.

[0052] The two ends of the corrugated component 222 are symmetrically fixedly connected with annular plates 26, and the two annular plates 26 are connected by springs 27.

[0053] See Figure 6 and Figure 7The mixing assembly 25 includes a swivel seat 251. Two swivel seats 251 are symmetrically rotatably connected inside the corrugated part 222. The outer circumferential surface of the swivel seat 251 is provided with a flow guide groove 252 that flows with the fluid. The flow guide groove 252 is composed of a straight section and an inclined section that are connected vertically, and the two inclined sections are inclined in opposite directions. An outwardly expanding blade 253 is fixedly connected at the lower center of the upper swivel seat 251, and an inwardly folding blade 254 is uniformly fixedly connected at the upper edge of the lower swivel seat 251.

[0054] Specifically, when the ink supply tube 3 delivers ink into the piezoelectric printhead body 1, the ink flows along the inclined section after entering the straight section of the guide channel 252. Due to the change in the direction of ink movement, a reaction force is generated on the guide channel 252. The multiple evenly distributed guide channels 252 are subjected to a uniform circumferential tangential force. The resultant force of these forces forms a rotational torque, driving the rotating base 251 to rotate around its own central axis.

[0055] The upper rotary seat 251 rotates under the influence of rotational torque, causing its connected outward-expanding blades 253 to rotate synchronously, thus promoting the diffusion of ink from the center to the edges. The lower rotary seat 251, due to the opposite inclination direction of its guide grooves 252 to the upper rotary seat 251, experiences a reverse rotational torque as ink flows through it. Therefore, the lower rotary seat 251 rotates in the opposite direction to the upper rotary seat 251. During this process, the lower rotary seat 251, through its connected inward-folding blades 254, pushes the ink from the inner edge of the corrugated element 222 towards the center.

[0056] With the synergistic effect of the outward-expanding blades 253 and the inward-folding blades 254, the ink forms forced convection inside the corrugated part 222. This not only enhances the fluidity of the ink, but also helps to improve the uniformity of heating of the heat-conducting pad 241, avoiding the problem of uneven ink viscosity caused by local cooling.

[0057] It is worth noting that the above-mentioned 3D printing piezoelectric nozzle spraying device also has the following advantages:

[0058] Advantage 1: Conventional connection methods often use rigid threads or snaps, which are prone to displacement stress when the piezoelectric nozzle moves at high frequency or changes in temperature. This leads to rigid tension accelerating the wear of the seals and even causing seal failure. In this embodiment, the corrugated part 222 of the mating part 22 has the ability to extend and contract axially and swing slightly radially. It can automatically offset the displacement stress caused by the movement or temperature change of the piezoelectric nozzle body 1, avoiding damage to the sealing ring 212 and other seals by rigid tension. At the same time, the flexibility of the corrugated part 222 reduces the impact of vibration on the connection node, significantly extending the service life of the seals and ensuring the sealing stability during long-term use.

[0059] Advantage 2: Conventional connections rely on "blind assembly," and during disassembly and reinstallation, operational deviations can easily lead to slight misalignment of the sealing surface, resulting in uneven distribution of sealing pressure and causing minor ink leakage. In this embodiment, precise docking is achieved through the alignment component 23: the guide groove 231 on the outer wall of the short tube 211 and the slider 232 on the inner wall of the fitting 221 cooperate one-to-one to ensure coaxiality during connection. The locking module 233 further fixes the position to prevent loosening after installation. This design fundamentally solves the misalignment problem of conventional "blind assembly," ensures complete sealing surface fit, and improves connection accuracy and reliability.

[0060] Advantage 3: Conventional connections only serve as transport channels and cannot interfere with the ink state. High-viscosity inks are prone to stagnation at the connections, and their fluidity decreases due to cooling, affecting jetting accuracy. In this embodiment, the mixing component 25 and the heating component 24 are optimized in synergy. In the mixing component 25, the guide grooves 252 of the upper and lower rotating seats 251 are tilted in opposite directions, forming a reverse rotational torque when the ink flows through. This drives the outward expanding blades 253 to push the central ink to the edge, and the inward folding blades 254 to pull the edge ink back to the center, so that the ink forms a circulating vortex inside the corrugated part 222, avoiding deposition and increasing fluidity. The flexible heat-conducting pads 241 of the heating component 24 are attached to the outer surface of the corrugated part 222. The vortex improves the heating uniformity through forced convection, avoiding viscosity differences between the inner and outer ink layers due to temperature differences. The combination of the two effectively solves the problem of transporting high-viscosity ink and improves the jetting accuracy of 3D printing.

[0061] Fourthly, conventional seals often use a single annular ring with a flat butt joint, resulting in uneven sealing pressure distribution. This can easily lead to leakage due to insufficient local pressure during high-viscosity ink delivery under high pressure. In this embodiment, the bottom of the countersunk hole 2211 gradually increases in depth radially from the inside to the outside. The end of the sealing ring 212 near the corrugated part 222 adopts the same gradient design, creating a gradient distribution of sealing pressure: the inner low-pressure seal is suitable for conventional pressure, while the outer high-pressure reinforcement is suitable for high-viscosity ink delivery under high pressure. This structure can effectively prevent ink leakage during high-pressure delivery due to the greater contact pressure on the outside, significantly improving sealing reliability.

[0062] Advantage 5: Conventional straight cylindrical connecting tubes have a smooth curved outer wall, resulting in limited contact area with the heating element and low heating efficiency. In this embodiment, the corrugated component 222 has a corrugated structure, and its outer surface area is much larger than that of a conventional straight cylindrical component for the same length. The flexible heat-conducting pad 241 attached to the outside of the corrugated component 222 can fully contact the corrugated surface, significantly increasing the heat exchange area between the heating element and the ink channel, thereby improving heating efficiency, achieving ink temperature control more quickly, and further ensuring ink flowability. In addition, based on the corrugated structure characteristics of the corrugated component 222, the area of ​​the heat-conducting pad 241 attached to its outside is larger than that of a conventional straight cylindrical connecting tube for the same length, which increases the contact area with the ink accordingly, thereby improving heating efficiency.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A 3D printing piezoelectric nozzle ink spraying device, characterized in that, include: The piezoelectric printhead body (1) has an ink inlet (11) connected to the ink supply tube (3) via a connecting part (2); The connecting part (2) includes a connector (21) connected to the ink inlet (11) and the ink supply tube (3). The two connectors (21) are connected by a docking part (22). The docking part (22) adopts a three-section design, consisting of two symmetrically arranged tubes (221) connected to the connector (21) and a corrugated part (222) for connecting the two tubes (221). The inner wall of the tube (221) and the outer wall of the connector (21) are both provided with an alignment component (23) to assist in their docking. The corrugated part (222) is provided with a heating component (24) for heating the ink to improve its fluidity. The corrugated part (222) is connected to a mixing component (25) that rotates with the ink flow. When the mixing component (25) rotates, it stirs the ink inside the corrugated part (222) to make it flow, preventing particles from remaining in the ink while improving the heating uniformity and rate of the heating component (24). The connector (21) includes a short tube (211), and the inner wall of the tube (221) is provided with a countersunk hole (2211). The short tube (211) is slidably connected in the countersunk hole (2211), and the connection between the two is sealed by a sealing ring (212). The other ends of the two short tubes (211) are detachably connected to the ink inlet (11) and the ink supply tube (3) respectively by threads and sealing rings (212) in the same manner. The bottom of the countersunk hole (2211) adopts a gradient design, and its depth gradually increases from the inside to the outside along the radial direction of the pipe fitting (221). The end of the sealing ring (212) near the corrugated part (222) adopts the same gradient design as the countersunk hole (2211). The alignment component (23) includes a guide groove (231). The outer wall of the short tube (211) is uniformly provided with guide grooves (231). The end of the guide groove (231) near the corrugated part (222) is a straight section and adopts an open design. The end of the guide groove (231) away from the corrugated part (222) is an inclined section and communicates with the straight section. The inner wall of the tube (221) is uniformly fixedly connected with sliders (232). The sliders (232) correspond one-to-one with the guide grooves (231), and the corresponding sliders (232) and guide grooves (231) are slidably connected. The short tube (211) and the tube (221) are jointly connected with a locking module (233). The mixing assembly (25) includes a swivel seat (251), two of which are symmetrically connected inside the corrugated part (222). The outer circumferential surface of the swivel seat (251) is provided with a flow guide groove (252) that flows with the fluid. The flow guide groove (252) is composed of a straight section and an inclined section that are connected vertically, and the two inclined sections are inclined in opposite directions. An outwardly expanding blade (253) is fixedly connected at the lower center of the upper swivel seat (251), and an inwardly folding blade (254) is uniformly fixedly connected at the upper edge of the lower swivel seat (251). The heating component (24) includes a heat-conducting pad (241), which is flexible and attached to the outer surface of the corrugated part (222). The corrugated part (222) is also connected to a temperature control central module (242) that is connected to the heat-conducting pad (241) and causes the heat-conducting pad (241) to heat up.

2. The 3D printing piezoelectric nozzle ink spraying device according to claim 1, characterized in that: The locking module (233) includes a locking block (2331). Adjacent locking blocks (2331) are uniformly fixedly connected to the outer wall of the short pipe (211) and misaligned with the guide groove (231). A clearance groove (2212) is provided on the pipe fitting (221) to avoid interference when the locking block (2331) rotates. A locking hole (2332) is provided through the end of the locking block (2331) near the corrugated part (222). A locking ring (2333) that matches the locking hole (2332) is rotatably connected to the pipe fitting (221). A locking rod (2334) that matches the locking hole (2332) is uniformly fixedly connected to the inner wall of the locking ring (2333).

3. The 3D printing piezoelectric nozzle ink spraying device according to claim 1, characterized in that: The two ends of the corrugated part (222) are symmetrically fixedly connected with annular plates (26), and the two annular plates (26) are connected by springs (27).

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