Fluidic assembly and droplet ejection device

Abstract

The utility model discloses a kind of fluid assembly and microdrop ejection device, it is related to point glue valve technical field, fluid assembly includes mounting seat and striker assembly, installation cavity is formed in mounting seat, the bottom end of installation cavity is connected with nozzle;Striker assembly includes striker and striker spring, striker is located in installation cavity, striker spring is sleeved in striker, striker is compressed striker spring when moving downward, mounting seat and striker are enclosed to form glue injection cavity, and striker can be lifted and moved along mounting seat to extrude glue in glue injection cavity to nozzle and spray.

Description

Technical Field

[0001] This utility model relates to the field of dispensing valve technology, and in particular to a fluid component and a micro-droplet injection device. Background Technology

[0002] Piezoelectric jet dispensing valves are widely used in the electronic packaging field. Piezoelectric jet dispensing enables non-contact adhesive spraying, offering high efficiency and precision while maintaining non-contact operation. However, despite these advantages, piezoelectric jet dispensing still has limitations in its application. The fluid assembly is one of the core components of the entire microdroplet jetting device, playing a crucial role in the controlled delivery of the adhesive. Existing fluid assembly structures are relatively complex, hindering subsequent disassembly and maintenance. Utility Model Content

[0003] The main objective of this invention is to propose a fluid assembly and a micro-droplet injection device, which aims to simplify the structure of the fluid assembly and improve the ease of maintenance of the fluid assembly.

[0004] To achieve the above objectives, the fluid assembly proposed in this utility model includes:

[0005] Mounting base, wherein a mounting cavity is formed within the mounting base, and a nozzle is connected to the bottom end of the mounting cavity;

[0006] The impact pin assembly includes an impact pin and an impact pin spring. The impact pin is disposed in the mounting cavity, and the impact pin spring is sleeved on the impact pin. When the impact pin moves downward, it compresses the impact pin spring. The mounting base and the impact pin enclose an injection cavity. The impact pin can move up and down along the mounting base to squeeze the glue in the injection cavity to the nozzle for spraying.

[0007] In one embodiment, the fluid assembly further includes a guide sleeve, which is sleeved on the firing pin and extends along the axial direction of the firing pin. The top wall of the guide sleeve abuts against the bottom end of the firing pin spring, and the outer peripheral wall of the guide sleeve is engaged within the mounting cavity.

[0008] In one embodiment, the fluid assembly further includes a plug, a step is formed in the mounting base, the plug is sleeved on the firing pin and engaged in the step, and the side of the guide sleeve opposite to the firing pin spring abuts against the plug.

[0009] In one embodiment, a clearance groove is formed at one end of the guide sleeve near the plug, and the clearance groove extends radially along the guide sleeve.

[0010] In one embodiment, the fluid assembly further includes a nut, the inner peripheral wall of which is provided with an internal thread, and the outer peripheral wall of the mounting base is provided with an external thread. The internal thread and the external thread are screwed together so that the bottom wall of the mounting base and the side of the bottom wall of the nut facing the mounting base clamp the top end of the nozzle. The bottom wall of the nut has a through hole, and the bottom end of the nozzle extends outward through the through hole.

[0011] In one embodiment, the fluid assembly further includes a glue inlet nozzle, a glue inlet nozzle base, and a flow channel. The glue inlet nozzle is connected to the glue inlet nozzle base, and the two ends of the flow channel in the length direction are respectively connected to the glue inlet nozzle base and the mounting base. The glue inlet nozzle, the glue inlet nozzle base, the flow channel, and the mounting base are sequentially connected and form a glue channel inside.

[0012] In one embodiment, the fluid assembly further includes a plug connected to the end of the flow channel away from the mounting base to achieve a lateral seal of the colloidal channel.

[0013] This utility model also proposes a microdroplet ejection device, which includes the fluid component described above and a microdroplet ejection body, wherein the microdroplet ejection body includes:

[0014] A housing having an installation space;

[0015] A piezoelectric module, comprising piezoelectric ceramic, a lever assembly, and an adjustment assembly, wherein the lever assembly comprises a lever, a pivot seat, and a pivot, the pivot seat is installed in the installation space, the pivot is fixedly connected to the pivot seat, and the lever is placed above the pivot and can rotate relative to the pivot;

[0016] The adjustment assembly includes an adjustment seat, an adjustment rod, a spring seat, and a preload spring. The adjustment seat is installed in the installation space and has a through cavity extending vertically. The spring seat is engaged in the through cavity. The preload spring is vertically disposed in the spring seat. The adjustment rod is connected to the adjustment seat.

[0017] The preload spring is arranged parallel to the piezoelectric ceramic. The lever has a first end and a second end along its length. The piezoelectric ceramic is located at the top of the first end, and the preload spring is located at the bottom of the second end. The adjusting rod can drive the adjusting seat to rise and fall relative to the housing to adjust the relative position of the striking pin and the nozzle.

[0018] In one embodiment, the microdroplet ejection device further includes a fluid mounting assembly, which includes a rotating shaft, a fastening ball, a preload spring, and a wrench. The outer peripheral wall of the rotating shaft extends to form a mounting groove with a gradually decreasing depth. The adjusting seat and the housing enclose a rotating shaft mounting cavity. One axial end of the rotating shaft is disposed in the rotating shaft mounting cavity, and the other end extends out of the rotating shaft mounting cavity and is connected to the wrench. A connecting channel is formed between the through cavity and the rotating shaft mounting cavity. The fastening ball is disposed in the connecting channel and one end abuts against the mounting groove. The wrench can drive the rotating shaft to rotate so that the end of the fastening ball facing away from the rotating shaft is exposed in the through cavity. The preload spring is sleeved on the rotating shaft, and the two axial ends of the preload spring abut against the bottom wall of the housing and the rotating shaft, respectively.

[0019] In one embodiment, the microdroplet ejection device further includes a syringe assembly and a nozzle heating assembly;

[0020] The syringe assembly includes a syringe and a syringe heating structure. A cavity is formed inside the syringe to accommodate the colloid. The bottom end of the syringe is connected to the colloid inlet. The syringe heating structure is connected to the outer peripheral wall of the syringe to heat the syringe.

[0021] The nozzle heating assembly includes a flow channel mounting base and a heating structure. The flow channel mounting base has a mounting surface, the flow channel is mounted on the mounting surface, and the heating structure is connected to the flow channel mounting base to heat the flow channel.

[0022] This invention proposes a fluid assembly, including a mounting base and a striker assembly. The mounting base has an internal mounting cavity providing space for the striker assembly. The bottom of the mounting cavity is directly connected to a nozzle, ensuring the colloid flows smoothly to the nozzle under the action of the striker assembly. The striker assembly consists of a striker and a striker spring. The striker is located within the mounting cavity, its top end engaging with the spring, which is sleeved around the outer circumference of the striker. When the striker moves downwards, it compresses the striker spring, accumulating elastic potential energy. This elastic potential energy allows the striker to reposition itself within the mounting cavity when the downward pressure is released. The mounting base and the striker enclose a dispensing cavity, serving as a temporary storage area for the colloid. When the striker descends, it squeezes the colloid within the cavity, precisely ejecting it as microdroplets through the nozzle. The mechanical linkage between the striker and the spring achieves quantitative colloid delivery. The direct connection between the nozzle and the mounting cavity shortens the colloid delivery path, reducing the risk of residue and curing during delivery. This design achieves high-precision, high-frequency microdroplet ejection with a relatively simple structure, making it particularly suitable for microdroplet ejection scenarios involving high viscosity or fast-curing colloids. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of an embodiment of the microdroplet ejection device provided by this utility model;

[0025] Figure 2 for Figure 1 A three-dimensional structural diagram of the micro-droplet jetting body;

[0026] Figure 3 for Figure 2 A cross-sectional view of the micro-droplet jetting body;

[0027] Figure 4 for Figure 2 Schematic diagram of the explosion structure of the micro-droplet jetting body;

[0028] Figure 5 for Figure 3 A three-dimensional structural diagram of a medium-voltage electrical module;

[0029] Figure 6 for Figure 4 Schematic diagram of the structure of the fluid mounting assembly;

[0030] Figure 7 for Figure 6 Schematic diagram of the structure of the rotating shaft;

[0031] Figure 8 A schematic diagram of the structure of an embodiment of the fluid assembly provided by this utility model;

[0032] Figure 9 for Figure 8 A cross-sectional view of the fluid assembly.

[0033] Figure 10 for Figure 8 Exploded structural diagram of a fluid-bearing component;

[0034] Figure 11 This is a schematic diagram of the structure of an embodiment of the nozzle heating assembly provided by this utility model;

[0035] Figure 12 This is a schematic diagram of the assembly of the microdroplet jetting body and the fluid component in this utility model;

[0036] Figure 13 for Figure 12A cross-sectional view of the assembled micro-droplet jetting body and fluid components;

[0037] Figure 14 This is a schematic diagram of the assembly of the fluid component and the syringe component in this utility model;

[0038] Figure 15 This is a schematic diagram of the assembly of the fluid component and the nozzle heating component in this utility model.

[0039] Explanation of icon numbers:

[0040] 100. Microdroplet ejection device; 10. Microdroplet ejection body; 1. Housing; 2. Piezoelectric module; 21. Piezoelectric ceramic; 21a. Body; 21b. Upper hinge; 21c. Lower hinge; 22. Lever assembly; 221. Lever; 222. Rotary shaft seat; 223. Rotary shaft; 23. First adjustment assembly; 231. Adjustment seat; 231a. First lug; 232. Adjustment rod; 233. Spring seat; 234. Preload spring; 235. Support pin; 236. Limit pin; 237. Nut; 238. Threaded post; 24. Second adjustment assembly; 241. Ceramic ball; 242. Concave block; 243. Torque screw; 244. Washer; 245. Screw; 3. Control board; 4. First temperature sensor; 51. Air inlet; 52. Air outlet; 6. Fluid mounting assembly; 61. Rotating shaft; 61a, mounting groove; 62, fastening ball; 63, preload spring; 64, wrench; 7, connecting cable; 20, fluid assembly; 201, mounting base; 201a, recess; 201b, second lug; 202, nozzle; 203, firing pin assembly; 2031, firing pin; 2032, firing pin spring; 204, guide sleeve; 204a, clearance groove; 205, plug; 206, nut; 207, inlet nozzle; 208, inlet nozzle base; 209, flow channel; 210, plug; 30, syringe assembly; 40, nozzle heating assembly; 401, heating block; 401a, fastening screw; 402, heat insulation block; 403, mounting block; 404, bellows; 405, connector mounting base; 406, cable connector; 407, heating rod; 408, second temperature sensor.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] Piezoelectric jet dispensing valves are widely used in the electronic packaging field. Piezoelectric jet dispensing enables non-contact adhesive spraying, offering high efficiency and precision while maintaining non-contact operation. However, despite these advantages, piezoelectric jet dispensing still has limitations in its application. The fluid assembly is one of the core components of the entire microdroplet jetting device, playing a crucial role in the controlled delivery of the adhesive. Existing fluid assembly structures are relatively complex, hindering subsequent disassembly and maintenance.

[0046] To solve the above problems, please refer to... Figures 8 to 10 This utility model proposes a fluid assembly 20, including a mounting base 201 and a striker assembly 203. The mounting base 201 has a mounting cavity, and a nozzle 202 is connected to the bottom end of the mounting cavity. The striker assembly 203 includes a striker 2031 and a striker spring 2032. The striker 2031 is disposed in the mounting cavity, and the striker spring 2032 is sleeved on the striker 2031. When the striker 2031 moves downward, it compresses the striker spring 2032. The mounting base 201 and the striker 2031 enclose a glue injection cavity. The striker 2031 can move up and down along the mounting base 201 to squeeze the glue in the glue injection cavity to the nozzle 202 for spraying.

[0047] The present invention provides a fluid assembly 20, including a mounting base 201 and a striker assembly 203. The mounting base 201 has an internal mounting cavity providing space for the striker assembly 203. The bottom end of the mounting cavity is directly connected to a nozzle 202, ensuring that the colloid flows smoothly to the nozzle 202 under the action of the striker assembly 203. The striker assembly 203 consists of a striker 2031 and a striker spring 2032. The striker 2031 is located within the mounting cavity, and its top end engages with the striker spring 2032. The striker spring 2032 is sleeved around the outer periphery of the striker 2031. When the striker 2031 moves downward, it compresses the striker spring 2032, accumulating elastic potential energy. This elastic potential energy is used to reset the striker 2031 within the mounting cavity when the downward pressure is lost. The mounting base 201 and the ejector pin 2031 enclose a dispensing cavity, which serves as a temporary storage area for the colloid. When the ejector pin 2031 descends, it squeezes the colloid within the cavity, precisely ejecting it as microdroplets through the nozzle 202. The mechanical linkage between the ejector pin 2031 and the ejector pin spring 2032 achieves quantitative colloid delivery. The direct connection between the nozzle 202 and the mounting cavity shortens the colloid delivery path, reducing the risk of colloid residue and curing during delivery. This design achieves high-precision, high-frequency microdroplet ejection with a relatively simple structure, making it particularly suitable for microdroplet ejection scenarios involving high-viscosity or fast-curing colloids.

[0048] In an optional embodiment, to ensure the reliability of the lifting and lowering movement of the striking pin 2031, please refer to... Figures 8 to 10 The fluid assembly 20 also includes a guide sleeve 204, which is sleeved on the striker 2031 and extends along the axial direction of the striker 2031. The top wall of the guide sleeve 204 abuts against the bottom end of the striker spring 2032, and the outer peripheral wall of the guide sleeve 204 is engaged in the mounting cavity.

[0049] The guide sleeve 204 is a hollow sleeve made of annular metal or engineering plastic, fitted around the outer periphery of the firing pin 2031 and extending axially along the firing pin 2031. Its top wall abuts against the bottom end of the firing pin spring 2032, and its outer peripheral wall is secured within the mounting cavity. The guide sleeve 204 achieves coaxiality control of the firing pin 2031's movement, preventing the firing pin 2031 from swaying due to lateral forces during lifting and lowering. The fit design between the guide sleeve 204 and the firing pin 2031 ensures smooth sliding of the firing pin 2031 while preventing leakage of colloid from the gaps. This structure restricts the reciprocating motion of the firing pin 2031 to a single axial degree of freedom, significantly reducing the probability of nozzle 202 clogging caused by the tilting of the firing pin 2031. At the same time, the firing pin spring 2032 transmits pressure through the guide sleeve 204, ensuring uniform force on the firing pin 2031, extending the fatigue life of the firing pin spring 2032, and facilitating smooth movement of the firing pin 2031 within the mounting cavity.

[0050] In an optional embodiment, to further improve the sealing effect within the mounting cavity, please refer to... Figures 8 to 10The fluid assembly 20 also includes a plug 205. A step is formed in the mounting base 201. The plug 205 is sleeved on the striker 2031 and locked in the step. The guide sleeve 204 abuts against the plug 205 on the side opposite to the striker spring 2032.

[0051] The inner wall of the mounting cavity is machined with stepped sections. The plug 205 is fitted onto the striker 2031 and secured at the steps, its lip adaptively adhering to the surface of the striker 2031 under colloid pressure. The lower end face of the guide sleeve 204 abuts against the upper end face of the plug 205, forming a double-sealing structure: the plug 205 prevents colloid leakage upwards along the striker 2031, and the guide sleeve 204 mechanically compresses to prevent axial movement of the plug 205. By separating the sealing and guiding functions, the plug 205 only performs the sealing task, avoiding seal failure due to wear of the guide sleeve 204. Simultaneously, the axial positioning of the plug 205 by the guide sleeve 204 prevents the sealing ring from flipping under high-pressure colloid impact, further improving the operational stability of the fluid assembly 20. Optionally, the plug 205 can be a sealing ring made of fluororubber, polyurethane, nitrile rubber, ethylene propylene rubber, polytetrafluoroethylene lip, etc., selected based on the adhesive or actual application scenario.

[0052] In an optional embodiment, for ease of installation of the guide sleeve 204 within the mounting cavity, please refer to... Figure 10 A clearance groove 204a is formed at one end of the guide sleeve 204 near the plug 205, and the clearance groove 204a extends radially along the guide sleeve 204.

[0053] The air-blocking groove 204a is a straight groove located at the bottom and extending radially along the guide sleeve 204. During installation of the guide sleeve 204, the air-blocking groove 204a can accommodate a portion of the air to ensure a tight fit between the guide sleeve 204 and the inner wall of the mounting base 201. This prevents air from being trapped between the guide sleeve 204, the mounting base 201, and the plug 205, which could lead to difficulty in pressing the guide sleeve 204 down and improper installation. Furthermore, by providing the air-blocking groove 204a, when the plug 205 is not replaced or damaged in time, the adhesive, after flowing upwards through the plug 205, can overflow out of the housing 1 through the air-blocking groove 204a of the guide sleeve 204 and the opening on the side wall of the mounting base 201, preventing it from flowing into the microdroplet ejection body 10 and causing damage.

[0054] In an optional embodiment, for ease of stable installation of the nozzle 202, please refer to... Figures 8 to 10The fluid assembly 20 also includes a nut 206, the inner peripheral wall of which is provided with an internal thread, and the outer peripheral wall of the mounting base 201 is provided with an external thread. The internal thread and the external thread are screwed together so that the bottom wall of the mounting base 201 and the side of the bottom wall of the nut 206 facing the mounting base 201 clamp the top of the nozzle 202. The bottom wall of the nut 206 is provided with a through hole, and the bottom end of the nozzle 202 extends outward through the through hole.

[0055] The nut 206 is a cap-like structure with internal threads and a through hole at the bottom. The outer wall of the mounting base 201 is machined with matching external threads. Rotating the nut 206 creates a clamping force between the bottom surface of the mounting base 201 and the inner bottom surface of the nut 206, securing the tip of the nozzle 202. The through hole in the bottom wall of the nut 206 allows the tip of the nozzle 202 to protrude. Specifically, the bottom wall of the mounting base 201 has a positioning hole. The tip of the nozzle 202 is radially limited by the positioning hole, and the clamping force between the nut 206 and the mounting base 201 provides axial fixation for the nozzle 202, ensuring the accuracy and stability of the nozzle 202 installation, and thus ensuring the stability of fluid jetting. Furthermore, this structure facilitates rapid replacement of the nozzle 202: when the nozzle 202 becomes clogged due to colloid solidification or wear, it can be removed simply by loosening the nut 206, without disassembling the entire fluid assembly 20, significantly reducing maintenance time. Furthermore, the nut 206 also protects the bottom of the mounting base 201, reducing damage to the mounting base 201 caused by external collisions or other interference.

[0056] In an alternative embodiment, for the delivery of fluid within the fluid assembly 20, please refer to... Figures 8 to 10 The fluid assembly 20 also includes a glue inlet 207, a glue inlet base 208, and a flow channel 209. The glue inlet 207 is connected to the glue inlet base 208. The two ends of the flow channel 209 in the length direction are respectively connected to the glue inlet base 208 and the mounting base 201. The glue inlet 207, the glue inlet base 208, the flow channel 209, and the mounting base 201 are connected in sequence and form a glue channel inside.

[0057] The bottom end of the nozzle 207 is connected to the nozzle base 208, and the top end is connected to the syringe via a Luer interface or thread. The nozzle base 208 serves as a transition piece, and its interior communicates with the nozzle 207. The flow channel 209 connects the nozzle base 208 and the mounting base 201, forming a continuous colloid channel within all three. The modular design of the nozzle base 208 allows for adaptation to different installation spaces by replacing the flow channel 209 with different lengths. The flow channel 209 can be made of metal to withstand corrosive colloids. Sealing rings are provided at the connection points between the nozzle 207 and the nozzle base 208, between the nozzle base 208 and the flow channel 209, and between the flow channel 209 and the mounting base 201 to ensure a sealed connection.

[0058] In an optional embodiment, for ease of cleaning and maintenance of the flow channel 209, please refer to... Figures 8 to 10 The fluid assembly 20 also includes a plug 210 connected to the end of the flow channel 209 away from the mounting base 201 to achieve a lateral seal of the colloid channel.

[0059] Because the flow direction of the colloid needs to change during its journey from the inlet nozzle 207 to the mounting base 201, a corner is present in the flow channel 209 to alter this flow direction. When the colloid reaches the corner, it is easily affected by flow resistance and becomes stagnant. After prolonged operation, some of the colloid solidifies at the corner, causing blockage of the flow channel 209. Therefore, to facilitate regular cleaning and maintenance of the flow channel 209, a removable plug 210 is provided at the corner of the flow channel 209 to facilitate opening the flow channel 209 for cleaning. The plug 210 is threaded to the end of the flow channel 209, and its outer peripheral wall forms a metal hard seal with the inner wall of the flow channel 209. A sealing ring is provided at the connection to improve the sealing effect. This provides a closed port during cleaning and maintenance of the flow channel 209, preventing colloid leakage from the non-working end. The end of the plug 210 can be machined with an internal hexagonal or slotted groove for easy disassembly and assembly using standard tools.

[0060] This utility model also proposes a microdroplet ejection device 100, which includes a fluid component 20 and a microdroplet ejection body 10. The microdroplet ejection body 10 includes a housing 1 and a piezoelectric module 2, with the housing 1 forming an installation space. The piezoelectric module 2 includes a piezoelectric ceramic 21, a lever assembly 22, and a first adjustment assembly 23. The lever assembly 22 includes a lever 221, a pivot seat 222, and a pivot 223. The pivot seat 222 is installed in the installation space, and the pivot 223 is fixedly connected to the pivot seat 222. The lever 221 is mounted above the pivot 223 and can rotate relative to the pivot 223. The first adjustment assembly 23 includes an adjustment seat 231 and an adjustment rod. 232, spring seat 233, and preload spring 234; adjusting seat 231 is installed in the installation space, forming a through cavity extending vertically; spring seat 233 is engaged in the through cavity; preload spring 234 is vertically disposed within spring seat 233; adjusting rod 232 is connected to adjusting seat 231; preload spring 234 is arranged parallel to piezoelectric ceramic 21; lever 221 has a first end and a second end along its length; piezoelectric ceramic 21 is disposed at the top of the first end; preload spring 234 is disposed at the bottom of the second end; adjusting rod 232 can drive adjusting seat 231 to rise and fall relative to housing 1, thereby adjusting the relative position of striker 2031 and nozzle 202. The specific structure of this fluid assembly 20 is as described in the above embodiments. Since this microdroplet ejection device 100 adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. Please refer to... Figures 1 to 5The housing 1 has an installation space for mounting the piezoelectric module 2. The piezoelectric module 2 consists of a piezoelectric ceramic 21, a lever assembly 22, and an adjustment assembly. The pivot seat 222 of the lever assembly 22 is fixed in the installation space, and the pivot 223 is hinged to the pivot seat 222, allowing the lever 221 to swing around a fixed axis. This amplifies the small vertical elongation of the piezoelectric ceramic 21 into a larger displacement at the second end of the lever 221. The adjustment seat 231 in the adjustment assembly is also located in the installation space. Its through cavity provides a guide for the spring seat 233, which is hung on the support pin 235 and fixed inside the housing 1. The preload spring 234 is placed inside the spring seat 233 and uses its elastic restoring force to continuously apply an upward thrust to the second end of the lever 221. This thrust is converted into a preload on the piezoelectric ceramic 21 through the lever 221, ensuring that the piezoelectric ceramic 21 is always under pressure. The adjusting rod 232 is connected to the adjusting seat 231. The lifting and lowering action of the adjusting rod 232 drives the adjusting seat 231 to move up and down as a whole, thereby adjusting the relative position of the striking pin 2031 and the nozzle 202. This ensures that the glue spraying state of the micro-droplet spraying device 100 meets the usage requirements during glue spraying, improving the convenience of adjustment. The piezoelectric ceramic 21 is located at the top of the first end of the lever 221, and the preload spring 234 is located at the bottom of the second end, forming a force closed loop of piezoelectric ceramic 21-lever 221-preload spring 234. The lever 221 acts as a force amplification mechanism, coupling the mechanical preload force of the preload spring 234 with the electrically controlled displacement of the piezoelectric ceramic 21 at both ends of the lever 221, achieving high-precision amplification of micro-displacement and closed-loop force control. Through this structure, the micro-droplet spraying body 10 can generate, amplify, and adjust force within a small volume, while ensuring that the piezoelectric ceramic 21 is always within a safe force range, extending its service life.

[0061] In an optional embodiment, to facilitate the support and limiting of the adjusting seat 231 within the housing 1, please refer to... Figure 3 and Figure 5 The adjustment assembly also includes support pins 235 and limit pins 236. There are two support pins 235 and two limit pins 236. The two support pins 235 are spaced apart in the horizontal direction and locked onto the housing 1. The two ends of the spring seat 233 are respectively connected to the two support pins 235.

[0062] Two limiting pins 236 are horizontally engaged in the housing 1 and located above the two support pins 235. Openings are formed on opposite sides of the side wall of the adjusting seat 231. The support pins 235 and the limiting pins 236 are both located in the openings. The limiting pins 236 can abut against the top wall of the opening to limit the downward stroke of the adjusting seat 231.

[0063] Two support pins 235 are horizontally spaced and fixed to the housing 1, forming a fixed fulcrum. The spring seat 233 overlaps the support pins 235 at both ends, allowing the weight of the spring seat 233 and the reaction force of the preloaded spring 234 to be transmitted to the housing 1 through the support pins 235, preventing the adjusting seat 231 from directly bearing shear force and improving structural reliability. Two limit pins 236 are horizontally fixed to the housing 1 and located above the support pins 235. The side wall of the adjusting seat 231 has an opening, which facilitates the support pins 235 and limit pins 236 in supporting or interfering with the adjusting component, and also facilitates the installation of the support pins 235 and limit pins 236, reducing the overall width of the micro-droplet spray body 10. Specifically, the spring seat 233 overlaps the support pins 235, achieving the installation and positioning of the spring seat 233 within the housing 1. The bottom walls of the openings on both sides of the adjusting seat 231 are a certain distance from the support pins 235 to avoid the adjusting seat 231 touching the support pins 235 and causing interference during lifting and lowering adjustments. The limiting pin 236 is used to limit the adjustment stroke of the adjusting seat 231. When the adjusting seat 231 moves downward to adjust a certain distance, the limiting pin 236 abuts against the top wall of the opening, preventing the adjusting seat 231 from continuing to descend and falling out of the housing 1, thereby ensuring the normal operation of the microdroplet injection body 10.

[0064] In an optional embodiment, for ease of adjusting the height of the adjusting seat 231 within the housing 1, please refer to... Figure 3 The adjusting assembly also includes a nut 237 and a threaded post 238. The outer peripheral wall of the adjusting rod 232 forms a limiting step. The threaded post 238 is sleeved on the adjusting rod 232 and its top surface abuts against the limiting step. The nut 237 is screwed to the adjusting post. The top of the nut 237 abuts against the bottom wall of the threaded post 238. The threaded post 238 has an external thread. The top of the adjusting seat 231 has an internal thread that matches the external thread. The adjusting rod 232 rotates relative to the housing 1 to drive the adjusting seat 231 to move up and down within the installation space.

[0065] Specifically, one end of the adjusting rod 232 extends into the housing 1 and connects to the threaded post 238 and the nut 237, while the other end protrudes from the outside of the housing 1 and connects to a knob or handle for rotation by the operator. The connection between the adjusting post and the outside of the housing 1 is sealed with a gasket 244 and a sealing ring to prevent external dust or moisture from entering the housing 1 through the connection gap. The limiting step on the outer peripheral wall of the adjusting rod 232 abuts against the top surface of the threaded post 238, locking the axial position of the threaded post 238. The nut 237 is screwed to the adjusting post and its top abuts against the bottom wall of the threaded post 238, thus fixing the threaded post 238 on the adjusting rod 232. The limiting step on the adjusting post and the nut 237 restrict the stroke of the threaded post 238 from both ends, preventing the threaded post 238 from axially moving during rotation with the adjusting rod 232. The external thread of the threaded column 238 engages with the internal thread at the top of the adjusting seat 231, converting the rotational motion of the adjusting rod 232 into the linear lifting and lowering of the adjusting seat 231; thereby realizing the lifting and lowering adjustment of the installation position of the adjusting seat 231 in the housing 1, so as to adjust the relative position of the striking pin 2031 and the nozzle 202, meet the requirements of the micro-droplet injection device 100 for the injection pressure under different usage conditions, and improve the applicability of the micro-droplet injection body 10.

[0066] In an optional embodiment, for ease of adjusting the preload on the top of the piezoelectric ceramic 21, please refer to... Figure 3 and Figure 5 The second adjustment component 24 also includes a ceramic ball 241, a concave block 242, a torque screw 243, a washer 244, and a screw 245. The washer 244 and the torque screw 243 are arranged sequentially along the direction close to the piezoelectric ceramic 21. The concave block 242 is connected to the bottom of the torque screw 243. An arc-shaped groove is formed on the side of the concave block 242 away from the washer 244. The ceramic ball 241 is located on the top of the piezoelectric ceramic 21, and the top of the ceramic ball 241 abuts against the arc-shaped groove.

[0067] The force transmission path at the top of the piezoelectric ceramic 21 is optimized by setting up a ceramic ball 241, a concave block 242, a torque screw 243, a washer 244, and a screw 245. Specifically, the piezoelectric ceramic 21 includes a main body 21a, an upper hinge 21b, and a lower hinge 21c. The upper hinge 21b is connected to the top of the main body 21a, and an arc-shaped recess 201a is formed on the side of the upper hinge 21b away from the main body 21a to accommodate the ceramic ball 241. The lower hinge 21c is connected to the bottom of the main body 21a, and an elongated recess 201a with an arc-shaped cross-section is formed on the side facing the lever 221. Correspondingly, the lever 221 has an elongated protrusion with an arc-shaped cross-section. The recess 201a and the protrusion cooperate to achieve the positioning and installation of the piezoelectric ceramic 21.

[0068] The ceramic ball 241, made of high-hardness, low-friction ceramic material, is placed on top of the piezoelectric ceramic 21, converting the concentrated load transmitted by the lever 221 into point contact, significantly reducing contact stress concentration. The bottom of the concave block 242 has an arc-shaped groove that forms a ball-and-socket fit with the ceramic ball 241. The radius of curvature of the arc-shaped groove is slightly larger than the radius of the ceramic ball 241, ensuring that the contact point is always directly above the center of the ball when the piezoelectric ceramic 21 elongates or contracts, avoiding lateral force in the horizontal direction. Furthermore, the ceramic ball 241, as an intermediate transition part, reduces the precision requirements for related parts. During the assembly of the microdroplet jetting body 10, the ceramic ball 241 can adaptively adjust to avoid generating large forces that could damage the piezoelectric ceramic 21. The torque screw 243 has a clearance fit with the concave block 242 and is axially pre-tightened via a washer 244 and screw 245. The tightening torque of the torque screw 243 can be precisely set to ensure a constant contact force between the ceramic ball 241 and the arc-shaped groove, further improving the stability and repeatability of force transmission. With the above structure, the axial force on the piezoelectric ceramic 21 is evenly distributed, reducing the propagation of microcracks caused by off-center loading and improving the reliability of the device.

[0069] When the microdroplet ejection body 10 is working, after the torque screw 243 rotates, the concave block 242 presses down, transmitting the preload through the ceramic ball 241, piezoelectric ceramic 21, and lever 221 to the preload spring 234. The preload spring 234 compresses and stores energy, while the piezoelectric ceramic 21 also stores energy under the action of the preload spring 234. The washer 244 is locked at the step of the housing 1. When the torque screw 243 is rotated to the appropriate position, the screw 245 connects the washer 244 and the torque screw 243, eliminating the connection gap between the torque screw 243 and the housing 1. This makes the displacement generated by the piezoelectric ceramic 21 under the action of the electric field more reliable, and the force and displacement of the piezoelectric ceramic 21 transmitted to the end striker 2031 more accurately.

[0070] In an optional embodiment, for monitoring the operating state of the piezoelectric ceramic 21, please refer to... Figures 3 to 5 The microdroplet ejection body 10 also includes a control board 3 and a first temperature sensor 4. The control board 3 is spaced apart from the piezoelectric ceramic 21 in the installation space to monitor the service life of the piezoelectric ceramic 21. The first temperature sensor 4 is connected to the side wall of the piezoelectric ceramic 21 to monitor the temperature of the piezoelectric ceramic 21.

[0071] Specifically, the control board 3 and the first temperature sensor 4 are connected to an external controller via a connecting cable 7. The control board transmits the lifespan and temperature values ​​of the piezoelectric ceramic 21 to the controller, which in turn connects to and controls the piezoelectric ceramic 21 via the connecting cable 7. In this embodiment, the first temperature sensor 4 is a PT100 sensor. The control board 3 and the piezoelectric ceramic 21 are spaced apart to avoid electromagnetic interference. The control board detects changes in the driving current, voltage, and impedance of the piezoelectric ceramic 21, transmitting this information to the external controller. An algorithm is then used to calculate the aging degree of the ceramic, thereby assessing its remaining lifespan. The first temperature sensor 4 is attached to the sidewall of the piezoelectric ceramic 21 to collect the ceramic temperature in real time, preventing depolarization failure due to overheating. Through the coordinated operation of the control board 3 and the temperature sensor, timely warnings can be issued when the ceramic performance deteriorates or the temperature becomes abnormal, reminding the user to perform maintenance or replacement, thus avoiding production losses caused by sudden downtime.

[0072] In an optional embodiment, heat dissipation is performed on the internal piezoelectric ceramic 21 to ensure its normal operation. Please refer to... Figure 1 and Figure 2 The micro-droplet ejection body 10 also includes an air inlet 51 and an air outlet 52. The air inlet 51 and the air outlet 52 are connected to the installation space. The air inlet 51 is used to connect to the air inlet pipe, and the air outlet 52 is used to connect to the air outlet pipe to input compressed air to dissipate heat from the piezoelectric ceramic 21.

[0073] By adding an air inlet 51 and an air outlet 52 to the top of the housing 1, a compressed air circulation cooling channel is constructed. The air inlet 51 connects to an external compressed air pipeline, introducing low-temperature dry air into the installation space; after the airflow sweeps over the surface of the piezoelectric ceramic 21, it carries heat and is discharged from the air outlet 52, forming forced convection cooling. The flow rate and temperature of the compressed air can be precisely controlled by an external pressure regulating valve and a refrigerated dryer to ensure that the piezoelectric ceramic 21 maintains a constant temperature during high-frequency operation; at the same time, the airflow can also remove dust and volatiles in the installation space, reducing the corrosion of the piezoelectric ceramic 21 and the lever 221 mechanism by pollutants. This helps to improve the service life of the microdroplet jetting body 10 and ensure its long-term stable operation.

[0074] In an optional embodiment, for ease of assembly of the microdroplet ejection body 10 and the fluid assembly 20, please refer to... Figure 3 , Figures 5 to 7The microdroplet injection device 100 also includes a fluid mounting assembly 6, which includes a rotating shaft 61, a fastening ball 62, a preload spring 63, and a wrench 64. The outer peripheral wall of the rotating shaft 61 extends to form a mounting groove 61a with a gradually shallowing / deepening depth. The adjusting seat 231 and the housing 1 enclose a rotating shaft 223 mounting cavity. One axial end of the rotating shaft 61 is located in the rotating shaft 223 mounting cavity, and the other end extends out of the rotating shaft 223 mounting cavity and is connected to the wrench 64. A connecting channel is formed between the through cavity and the rotating shaft 223 mounting cavity. The fastening ball 62 is located in the connecting channel and one end abuts against the mounting groove 61a. The wrench 64 can drive the rotating shaft 61 to rotate so that the end of the fastening ball 62 facing away from the rotating shaft 61 is exposed in the through cavity. The preload spring 63 is sleeved on the rotating shaft 61, and the two axial ends of the preload spring 63 abut against the bottom wall of the housing 1 and the rotating shaft 61, respectively.

[0075] A mounting groove 61a with a gradually changing depth is formed on the outer peripheral wall of the rotating shaft 61. When the operator turns the wrench 64 to drive the rotating shaft 61 to rotate, the groove depth of the mating part between the rotating shaft 61 and the fastening ball 62 gradually changes, thereby causing the rotating shaft 61 to push the fastening ball 62 to move axially along the connecting channel. One end of the fastening ball 62 abuts against the mounting groove 61a, and the other end extends into the through cavity when the rotating shaft 61 rotates to a specific angle, to abut against and lock the mounting seat 201 of the fluid assembly 20. A preload spring 63 is sleeved on the rotating shaft 61, and an annular groove is formed on the side of the rotating shaft 61 facing the preload spring 63. The end of the preload spring 63 is engaged in the annular groove, and the inner sidewall of the annular groove can limit the radial displacement of the preload spring 63, thereby ensuring the stability of the connection between the preload spring 63 and the rotating shaft 61 and reducing the radial offset generated by the preload spring 63 during compression and reset. By setting the preload spring 63, it is possible to facilitate the flexible rotation of the rotating shaft 61 relative to the housing 1. On the other hand, the reaction force exerted by the preload spring 63 on the rotating shaft 61 ensures a stable and reliable fit between the rotating shaft 61 and the fastening ball 62, thereby guaranteeing the reliability and stability of the fluid mounting assembly 6. This structure allows operators to install and remove the fluid assembly 20 in seconds without tools, greatly reducing maintenance time.

[0076] In an optional embodiment, to facilitate heating of the syringe and nozzle 202, the microdroplet ejection device 100 further includes a syringe assembly 30 and a nozzle heating assembly 40. The syringe assembly 30 includes a syringe and a syringe heating structure. A cavity is formed inside the syringe to accommodate the colloid. The bottom end of the syringe is connected to the colloid inlet 207. The syringe heating structure is connected to the outer peripheral wall of the syringe to heat the syringe. The nozzle heating assembly 40 includes a flow channel mounting base and a heating structure. The flow channel mounting base has a mounting surface. The flow channel 209 is mounted on the mounting surface. The heating structure is connected to the flow channel mounting base to heat the flow channel 209.

[0077] The syringe heating structure includes an outer cover, a syringe mounting component, a heating element, and a connector. The syringe mounting component forms a cavity to accommodate the syringe. The outer cover is fitted onto the syringe mounting component, and an installation space is formed between the inner peripheral wall of the outer cover and the outer peripheral wall of the syringe mounting component. The heating element covers the outer peripheral wall of the syringe mounting structure and is located within the installation space. The connector is electrically connected to the heating element to achieve heating of the syringe.

[0078] Please refer to Figure 11 The flow channel mounting base includes a heating block 401, a heat insulation block 402, and a mounting block 403. The heating block 401, the heat insulation block 402, and the mounting block 403 are connected in sequence and have a mounting surface on their top. The flow channel 209 is located on the mounting surface. The bottom of the heating block 401 has a through hole for the nut 206 to pass through. The end of the heating block 401 away from the heat insulation block 402 has an adjustable opening. The two sides of the opening are connected by fastening screws 401a. By rotating the fastening screws 401a, the size of the opening can be adjusted, thereby adjusting the size of the through hole at the bottom of the heating block 401. This allows the heating block 401 to clamp the side wall of the nut 206, achieving a fixed connection between the heating block 401 and the nut 206. At the same time, the heating block 401 can also better transfer heat to the nozzle 202.

[0079] The flow channel mounting base has a first mounting hole and a second mounting hole formed inside, both extending along the length of the flow channel mounting base and spaced apart along its width. A heating rod 407 is located in the first mounting hole, and a second temperature sensor 408 is located in the second mounting hole. A corrugated pipe 404 is connected to a mounting block 403, a connector mounting base 405 is connected to the corrugated pipe 404, and a cable connector 406 is connected to the connector mounting base 405. The connecting cable 7 for the heating rod 407 and the temperature sensor passes sequentially through the insulation block 402, the mounting base 201, the corrugated pipe 404, and the connector mounting base 405, connecting to the cable connector 406. The controller then connects to the cable connector 406 to control the heating temperature of the nozzle heating assembly 40. The insulation block 402 effectively concentrates the temperature of the nozzle heating assembly 40 on the heating block 401, making the temperature measured by the temperature sensor closer to the temperature of the nozzle 202, thus ensuring effective heating. In addition, the heating rod 407 located below the flow channel 209 can also heat the flow channel 209 to a certain extent, preventing the colloid from solidifying in the flow channel 209 and ensuring the smooth flow of the colloid in the fluid assembly 20.

[0080] Please refer to Figure 1 , Figures 12 to 15 The assembly process of the microdroplet ejection device 100 in this solution is described in detail below:

[0081] The first step is to turn the wrench 64 on the microdroplet jetting body 10 at a certain angle so that the fastening ball 62 retracts into the connecting channel.

[0082] The second step is to offset the second lug 201b of the mounting base 201 in the fluid assembly 20 from the first lug 231a on the adjusting seat 231 in the microdroplet jetting body 10, and then install the mounting base 201 in the fluid assembly 20 onto the adjusting seat 231. Figure 12 ).

[0083] Thirdly, after the mounting base 201 is pushed into the cavity of the adjusting base 231, the fluid assembly 20 is rotated at a certain angle so that the second lug 201b on the mounting base 201 in the fluid assembly 20 is placed on the first lug 231a of the adjusting base 231 in the microdroplet jetting body 10. Figure 13 The final installation position of the fluid assembly 20 and the microdroplet jet body 10 can be in a conventional horizontal state. If there is interference between the machine equipment and the fluid assembly 20 and the microdroplet jet body 10 in a horizontal state, the fluid assembly 20 can also be adjusted 90° to the left or right relative to the microdroplet jet body 10.

[0084] Fourth step, adjust the wrench 64 on the microdroplet jetting body 10 at a certain angle so that the fastening ball 62 abuts against the recess 201a on the side wall of the mounting base 201. Figure 13 ).

[0085] Fifth step, install the syringe 301 heating assembly onto the fluid jet body 21a. Figure 14 ).

[0086] Step 6: Install the nozzle heating assembly 40 onto the microdroplet ejection body 21a, and then tighten the fastening screws 401a on the side of the nozzle heating assembly 40 to complete the installation of the entire microdroplet ejection device 100. Figure 15 ).

[0087] The microdroplet jetting device 100 in this solution modifies the installation method of the piezoelectric ceramic 21 driving component, reduces the horizontal force and displacement of the piezoelectric ceramic 21, makes the force and displacement transmitted from the piezoelectric ceramic 21 to the lever 221 more precise, reduces the probability of assembly failure of the piezoelectric ceramic 21, and improves the working life of the piezoelectric ceramic 21.

[0088] The fluid assembly 20 is connected to the microdroplet jetting body 10 using a quick-release installation method, simplifying installation, shortening maintenance time, and improving work efficiency. The microdroplet jetting device 100 adjusts the height of the adjusting seat 231 by adjusting the knob on the adjusting rod 232 on the microdroplet jetting body 10, thereby adjusting the relative position of the nozzle 202 and the impact pin 2031. This simplifies operation and prevents workers from being burned by the nozzle heating assembly 40 during the adjustment of the nut 206. The optimized structural design of the nozzle heating assembly 40 simultaneously heats both the nozzle 202 and the flow channel 209, reducing the temperature difference between the temperature measured by the temperature sensor in the nozzle heating assembly 40 and the actual required temperature at the nozzle 202.

[0089] Temperature and lifespan monitoring are performed on the piezoelectric ceramic 21, the power element of the fluid microdroplet ejector body 10. A PT100 assembly is attached to the surface of the piezoelectric ceramic 21 to transmit the monitored temperature to the controller. The lifespan monitoring module of the piezoelectric ceramic 21 is packaged into a small PCB board and built into the housing 1 of the fluid microdroplet ejector body 10. Furthermore, the controller of the microdroplet ejector device 100 in this solution includes a control board that integrates heating functionality, enabling control of the syringe 301 heating assembly and the nozzle heating assembly 40. Therefore, only one controller is needed to control all three modules in the microdroplet ejector device 100.

[0090] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A fluid assembly, characterized in that, include: Mounting base, wherein a mounting cavity is formed within the mounting base, and a nozzle is connected to the bottom end of the mounting cavity; The impact pin assembly includes an impact pin and an impact pin spring. The impact pin is disposed in the mounting cavity, and the impact pin spring is sleeved on the impact pin. When the impact pin moves downward, it compresses the impact pin spring. The mounting base and the impact pin enclose an injection cavity. The impact pin can move up and down along the mounting base to squeeze the glue in the injection cavity to the nozzle for spraying.

2. The fluid assembly as claimed in claim 1, characterized in that, The fluid assembly also includes a guide sleeve, which is sleeved on the firing pin and extends along the axial direction of the firing pin. The top wall of the guide sleeve abuts against the bottom end of the firing pin spring, and the outer peripheral wall of the guide sleeve is engaged in the mounting cavity.

3. The fluid assembly as claimed in claim 2, characterized in that, The fluid assembly also includes a plug, and a step is formed in the mounting base. The plug is sleeved on the firing pin and locked in the step. The side of the guide sleeve opposite to the firing pin spring abuts against the plug.

4. The fluid assembly as claimed in claim 3, characterized in that, A clearance groove is formed at one end of the guide sleeve near the plug, and the clearance groove extends radially along the guide sleeve.

5. The fluid assembly as claimed in any one of claims 1 to 4, characterized in that, The fluid assembly also includes a nut, the inner peripheral wall of which is provided with an internal thread, and the outer peripheral wall of the mounting base is provided with an external thread. The internal thread and the external thread are screwed together so that the bottom wall of the mounting base and the bottom wall of the nut facing the mounting base clamp the top end of the nozzle. The bottom wall of the nut has a through hole, and the bottom end of the nozzle extends outward through the through hole.

6. The fluid assembly as claimed in claim 5, characterized in that, The fluid assembly further includes a glue inlet nozzle, a glue inlet nozzle base, and a flow channel. The glue inlet nozzle is connected to the glue inlet nozzle base, and the two ends of the flow channel in the length direction are respectively connected to the glue inlet nozzle base and the mounting base. The glue inlet nozzle, the glue inlet nozzle base, the flow channel, and the mounting base are connected in sequence and form a glue channel inside.

7. The fluid assembly as claimed in claim 6, characterized in that, The fluid assembly also includes a plug connected to the end of the flow channel away from the mounting base to achieve a lateral seal of the colloidal channel.

8. A microdroplet ejection device, characterized in that, The fluid assembly includes any one of claims 5 to 7, and a microdroplet ejection body, the microdroplet ejection body comprising: A housing having an installation space; A piezoelectric module, comprising piezoelectric ceramic, a lever assembly, and an adjustment assembly, wherein the lever assembly comprises a lever, a pivot seat, and a pivot, the pivot seat is installed in the installation space, the pivot is fixedly connected to the pivot seat, and the lever is placed above the pivot and can rotate relative to the pivot; The adjustment assembly includes an adjustment seat, an adjustment rod, a spring seat, and a preload spring. The adjustment seat is installed in the installation space and has a through cavity extending vertically. The spring seat is engaged in the through cavity. The preload spring is vertically disposed in the spring seat. The adjustment rod is connected to the adjustment seat. The preload spring is arranged parallel to the piezoelectric ceramic. The lever has a first end and a second end along its length. The piezoelectric ceramic is located at the top of the first end, and the preload spring is located at the bottom of the second end. The adjusting rod can drive the adjusting seat to rise and fall relative to the housing to adjust the relative position of the striking pin and the nozzle.

9. The microdroplet ejection device as described in claim 8, characterized in that, The microdroplet injection device further includes a fluid mounting assembly, which includes a rotating shaft, a fastening ball, a preload spring, and a wrench. The outer peripheral wall of the rotating shaft extends to form a mounting groove with a gradually decreasing depth. The adjusting seat and the housing enclose a rotating shaft mounting cavity. One axial end of the rotating shaft is located in the rotating shaft mounting cavity, and the other end extends out of the rotating shaft mounting cavity and is connected to the wrench. A connecting channel is formed between the through cavity and the rotating shaft mounting cavity. The fastening ball is located in the connecting channel and one end abuts against the mounting groove. The wrench can drive the rotating shaft to rotate so that the end of the fastening ball facing away from the rotating shaft is exposed in the through cavity. The preload spring is sleeved on the rotating shaft, and the two axial ends of the preload spring abut against the bottom wall of the housing and the rotating shaft, respectively.

10. The microdroplet ejection device as described in claim 8, characterized in that, The microdroplet ejection device also includes a syringe assembly and a nozzle heating assembly; The syringe assembly includes a syringe and a syringe heating structure. A cavity is formed inside the syringe to accommodate the colloid. The bottom end of the syringe is connected to the colloid inlet. The syringe heating structure is connected to the outer peripheral wall of the syringe to heat the syringe. The nozzle heating assembly includes a flow channel mounting base and a heating structure. The flow channel mounting base has a mounting surface, the flow channel is mounted on the mounting surface, and the heating structure is connected to the flow channel mounting base to heat the flow channel.

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