Droplet ejecting body and droplet ejecting apparatus

Abstract

The invention discloses a micro-droplet spraying main body and a micro-droplet spraying device, and relates to the technical field of dispensing valves, the micro-droplet spraying main body comprises a shell and a piezoelectric module, and a mounting space is formed in the shell; the piezoelectric module comprises piezoelectric ceramics, a lever assembly and a first adjusting assembly, the lever assembly comprises a lever, a rotating shaft seat and a rotating shaft, the rotating shaft seat is arranged in the mounting space, the rotating shaft is connected to the rotating shaft seat, and the lever is erected above the rotating shaft and can rotate relative to the rotating shaft; the first adjusting assembly comprises an adjusting seat, an adjusting rod, a spring seat and a pre-pressing spring, the adjusting seat is arranged in the mounting space, a through cavity is formed in the adjusting seat, the spring seat is clamped in the through cavity, the pre-pressing spring is vertically arranged in the spring seat, and the adjusting rod is connected with the adjusting seat; the prepressing spring and the piezoelectric ceramic are arranged in parallel, the lever is provided with a first end and a second end, the piezoelectric ceramic is arranged at the top of the first end, the prepressing spring is arranged at the bottom of the second end, and the adjusting rod can drive the adjusting base to conduct lifting adjustment relative to the shell so as to adjust the relative position of the firing pin and the nozzle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glue dispensing valve, in particular to a micro-droplet jetting main body and a micro-droplet jetting device. BACKGROUND

[0002] Piezoelectric jet glue dispensing valve is widely used in electronic packaging field, and non-contact jetting of glue can be realized by using piezoelectric jet glue dispensing, which can realize non-contact work, high efficiency and high precision. Although piezoelectric jet glue dispensing has many advantages, there are still some deficiencies in application.

[0003] The existing micro-droplet jetting device adjusts the relative position of the nozzle and the striker by adjusting the nut below the micro-droplet jetting device main body; when adjusting the relative position of the striker and the nozzle of the fluid micro-droplet jetting device, the screw of the nozzle heating assembly clamping nut needs to be loosened, the nozzle is adjusted to the appropriate position by adjusting the nut, and then the screw of the nozzle heating assembly clamping nut is tightened; this adjustment method is not only complicated to operate, but also the worker is easily scalded by the nozzle heating assembly during the adjustment of the nut. SUMMARY

[0004] The main purpose of the present application is to provide a micro-droplet jetting main body and a micro-droplet jetting device, which optimizes the structure of the micro-droplet jetting main body and improves the convenience of adjusting the relative position of the striker and the nozzle.

[0005] To achieve the above purpose, the micro-droplet jetting main body provided by the present application comprises:

[0006] A shell, wherein the shell forms an installation space inside;

[0007] A piezoelectric module, wherein the piezoelectric module comprises a piezoelectric ceramic, a lever assembly and a first adjusting assembly, the lever assembly comprises a lever, a rotating shaft seat and a rotating shaft, the rotating shaft seat is installed in the installation space, the rotating shaft is fixedly connected to the rotating shaft seat, and the lever is arranged above the rotating shaft and can rotate relative to the rotating shaft;

[0008] The first adjusting assembly comprises an adjusting seat, an adjusting rod, a spring seat and a pre-pressing spring, the adjusting seat is installed in the installation space, the adjusting seat forms a through cavity penetrating from top to bottom, the spring seat is clamped in the through cavity, the pre-pressing spring is arranged in the spring seat in the vertical direction, and the adjusting rod is connected to the adjusting seat;

[0009] The pre-pressing spring is arranged in parallel with the piezoelectric ceramic, the lever has a first end and a second end in the length direction, the piezoelectric ceramic is arranged at the top of the first end, the pre-pressing spring is arranged at the bottom of the second end, and the adjusting rod can drive the adjusting seat to ascend and descend relative to the shell to adjust the relative position of the striker and the nozzle.

[0010] In an embodiment, the first adjusting assembly further comprises two support pins and two limiting pins, the two support pins are arranged in the housing in a horizontal direction, and the two ends of the spring seat are respectively overlapped on the two support pins;

[0011] The two limiting pins are arranged in the housing in a horizontal direction and above the two support pins, opposite sides of the side wall of the adjusting seat are formed with openings, the support pins and the limiting pins are located in the openings, and the support pins can abut against the top wall of the openings to limit the stroke of the adjusting seat descending.

[0012] In an embodiment, the first adjusting assembly further comprises a nut and a threaded column, the outer peripheral wall of the adjusting rod is formed with a limiting step, the threaded column is sleeved on the adjusting rod and the top surface thereof abuts against the limiting step, the nut is screwed with the adjusting column, the top of the nut abuts against the bottom wall of the threaded column, the threaded column is formed with external threads, the top end of the adjusting seat is formed with internal threads matched with the external threads, and the adjusting rod is rotated relative to the housing to drive the adjusting seat to move up and down in the mounting space.

[0013] In an embodiment, the piezoelectric module further comprises a second adjusting assembly for pressure, the second adjusting assembly comprises a ceramic ball, a concave block, a torque screw, a gasket and a screw, the gasket and the torque screw are sequentially arranged in a direction close to the piezoelectric ceramic, the concave block is connected to the bottom of the torque screw, the side of the concave block away from the gasket is formed with an arc-shaped groove, the ceramic ball is arranged on the top of the piezoelectric ceramic, and the top of the ceramic ball abuts against the arc-shaped groove.

[0014] In an embodiment, the micro-droplet ejection body further comprises a control board and a first temperature sensor, the control board is arranged in the mounting space and spaced apart from the piezoelectric ceramic to monitor the service life of the piezoelectric ceramic, and the temperature sensor is connected to the side wall of the piezoelectric ceramic to monitor the temperature of the piezoelectric ceramic.

[0015] In an embodiment, the micro-droplet ejection body further comprises an air inlet nozzle and an air outlet nozzle, the air inlet nozzle and the air outlet nozzle communicate with the mounting space, the air inlet nozzle is used to connect an air inlet pipeline, and the air outlet nozzle is used to connect an air outlet pipeline to input compressed air to dissipate heat of the piezoelectric ceramic.

[0016] In an embodiment, the micro-droplet ejection body further comprises a fluid mounting assembly, the fluid mounting assembly comprises a rotating shaft, a fastening ball, a pre-tightening spring and a wrench, an outer peripheral wall of the rotating shaft is extended to form an installation groove with gradually shallower / deeper depth, the adjusting seat and the shell enclose a rotating shaft installation cavity, one end of the rotating shaft is arranged in the rotating shaft installation cavity, the other end of the rotating shaft partially extends out of the rotating shaft installation cavity and is connected with the wrench, a connecting channel is formed between the through cavity and the rotating shaft installation cavity, the fastening ball is arranged in the connecting channel and one end of the fastening ball abuts against the installation groove, the wrench can drive the rotating shaft to rotate so that one end of the fastening ball away from the rotating shaft is exposed in the through cavity, the pre-tightening spring is sleeved on the rotating shaft, and both ends of the pre-tightening spring axially abut against the bottom wall of the shell and the rotating shaft, respectively.

[0017] The application further provides a micro-droplet ejection device, which comprises the above micro-droplet ejection body and a fluid assembly, the fluid assembly comprises a mounting seat and a striker assembly, an installation cavity is formed in the mounting seat, a nozzle is connected to the bottom end of the installation cavity, the striker assembly comprises a striker and a striker spring, the striker is arranged in the installation cavity, and the striker spring is sleeved on the striker, the mounting seat and the striker enclose a glue injection cavity, and the striker can be moved up and down along the mounting seat to extrude the glue in the glue injection cavity to the nozzle for ejection.

[0018] In an embodiment, the fluid assembly further comprises 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, both ends of the flow channel in the length direction are connected to the glue inlet nozzle base and the mounting seat, respectively, the glue inlet nozzle, the glue inlet nozzle base, the flow channel and the mounting seat are sequentially communicated and internally form a glue passage.

[0019] In an embodiment, the micro-droplet ejection device further comprises a needle cylinder assembly and a nozzle heating assembly.

[0020] The needle cylinder assembly comprises a needle cylinder and a needle cylinder heating structure, the needle cylinder forms a containing cavity in the inside to contain glue, the bottom end of the needle cylinder is communicated with the glue inlet nozzle, and the needle cylinder heating structure is connected to the peripheral wall of the needle cylinder to heat the needle cylinder.

[0021] The nozzle heating assembly comprises a flow channel mounting seat and a heating structure, the flow channel mounting seat forms an installation surface, the flow channel is mounted on the installation surface, and the heating structure is connected to the flow channel mounting seat to heat the flow channel.

[0022] The technical scheme of the present application provides a micro-droplet ejection main body, which comprises a shell and a piezoelectric module. The shell is provided with a mounting space for mounting the piezoelectric module. The piezoelectric module is composed of a piezoelectric ceramic, a lever assembly and a first adjusting assembly. The pivot seat of the lever assembly is fixed in the mounting space, and the pivot is hinged to the pivot seat, so that the lever can swing around the fixed axis, thereby amplifying the slight elongation of the piezoelectric ceramic in the vertical direction to a larger displacement of the second end of the lever. The adjusting seat in the first adjusting assembly is also provided in the mounting space, and the through cavity passing through the adjusting seat provides guidance for the spring seat, which is fixed in the shell. The pre-compression spring is arranged inside the spring seat and continuously applies an upward thrust to the second end of the lever by using the elastic restoring force, and the thrust is converted into a pre-compression force on the piezoelectric ceramic through the lever action, so that the piezoelectric ceramic always works in a compressed state. The adjusting rod is connected with the adjusting seat, and the adjusting seat is moved up and down as a whole through the lifting action of the adjusting rod, so as to adjust the relative position of the striker and the nozzle, thereby achieving the use requirement of the ejection state of the glue line in the process of controlling the micro-droplet ejection device to eject glue, and improving the convenience of adjustment. The piezoelectric ceramic is located at the top of the first end of the lever, and the pre-compression spring is located at the bottom of the second end, forming a force closed loop of piezoelectric ceramic-lever-pre-compression spring. The lever acts as a force amplification mechanism to couple the mechanical pre-tightening force of the pre-compression spring and the electrically controlled displacement of the piezoelectric ceramic at both ends of the lever, realizing high-precision amplification of micro-displacement and closed-loop control of force. Through the above structure, the micro-droplet ejection main body can complete the generation, amplification and adjustment of force in a small volume, while ensuring that the piezoelectric ceramic always works in a safe stress interval, prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0024] Figure 1 The structure schematic diagram of an embodiment of the micro-droplet ejection device provided by the present application;

[0025] Figure 2 The structure schematic diagram of an embodiment of the micro-droplet ejection device provided by the present application; Figure 1 The three-dimensional structure schematic diagram of the micro-droplet ejection main body in the present application;

[0026] Figure 3 The three-dimensional structure schematic diagram of the micro-droplet ejection main body in the present application; Figure 2 The sectional structure schematic diagram of the micro-droplet ejection main body in the present application;

[0027] Figure 4 The sectional structure schematic diagram of the micro-droplet ejection main body in the present application; Figure 2 The exploded structure schematic diagram of the micro-droplet ejection main body in the present application;

[0028] Figure 5 Fig. 1 is a perspective view of a medium voltage electrical module according to the present invention; Figure 3 Fig. 2 is a perspective view of a medium voltage electrical module according to the present invention;

[0029] Figure 6 Fig. 3 is a perspective view of a medium fluid mounting assembly according to the present invention; Figure 4 Fig. 4 is a perspective view of a medium fluid mounting assembly according to the present invention;

[0030] Figure 7 Fig. 5 is a perspective view of a medium rotating shaft according to the present invention; Figure 6 Fig. 6 is a perspective view of a medium rotating shaft according to the present invention;

[0031] Figure 8 Fig. 7 is a perspective view of a fluid assembly according to the present invention;

[0032] Figure 9 Fig. 8 is a cross-sectional view of a fluid assembly according to the present invention; Figure 8 Fig. 9 is an exploded view of a fluid assembly according to the present invention;

[0033] Figure 10 Fig. 10 is a perspective view of a nozzle heating assembly according to the present invention; Figure 8 Fig. 11 is an exploded view of a nozzle heating assembly according to the present invention;

[0034] Figure 11 Fig. 12 is a perspective view of a droplet ejection body according to the present invention;

[0035] Figure 12 Fig. 13 is a perspective view of a droplet ejection body according to the present invention;

[0036] Figure 13 Fig. 14 is a cross-sectional view of a droplet ejection body according to the present invention; Figure 12 Fig. 15 is an exploded view of a droplet ejection body according to the present invention;

[0037] Figure 14 Fig. 16 is a perspective view of a fluid assembly according to the present invention;

[0038] Figure 15 Fig. 17 is a perspective view of a fluid assembly according to the present invention.

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 100, micro-droplet ejection device; 10, micro-droplet ejection body; 1, housing; 2, piezoelectric module; 21, piezoelectric ceramic; 21a, main body; 21b, upper hinge; 21c, lower hinge; 22, lever assembly; 221, lever; 222, pivot seat; 223, pivot; 23, first adjusting assembly; 231, adjusting seat; 231a, first lug; 232, adjusting lever; 233, spring seat; 234, pre-press spring; 235, support pin; 236, limit pin; 237, nut; 238, threaded column; 24, second adjusting assembly; 241, ceramic ball; 242, concave block; 243, torque screw; 244, gasket; 245, screw; 3, control board; 4, first temperature sensor; 51, air inlet nozzle; 52, air outlet nozzle; 6, fluid mounting assembly; 61, rotating shaft; 61a, mounting groove; 62, fastening ball; 63, pre-tightening spring; 64, wrench; 7, connecting cable; 20, fluid assembly; 201, mounting seat; 201a, dimple; 201b, second lug; 202, nozzle; 203, striker assembly; 2031, striker; 2032, striker spring; 204, guide sleeve; 204a, air-avoiding groove; 205, plug; 206, nut; 207, glue inlet nozzle; 208, glue inlet nozzle base; 209, flow channel; 210, plug; 30, needle cylinder assembly; 40, nozzle heating assembly; 401, heating block; 401a, fastening screw; 402, temperature insulation block; 403, mounting block; 404, corrugated tube; 405, joint mounting seat; 406, cable joint; 407, heating rod; 408, second temperature sensor.

[0041] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments in combination with the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0043] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0044] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes include "A and / or B", including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0045] Piezoelectric jet dispensing valve is widely used in electronic packaging field, using piezoelectric jet dispensing can realize non-contact jet dispensing of glue, which can realize non-contact work, high efficiency and high precision. Although piezoelectric jet dispensing has many advantages, but there are still deficiencies in application.

[0046] The existing micro-droplet jetting device adjusts the relative position of the nozzle and the striker by adjusting the nut under the main body of the micro-droplet jetting device; when adjusting the relative position of the striker and the nozzle of the fluid micro-droplet jetting device, the screw of the nozzle heating assembly clamping nut needs to be loosened, the nozzle is adjusted to the appropriate position by adjusting the nut fixed relative to the nut, and then the screw of the nozzle heating assembly clamping nut is tightened; this kind of adjustment mode is not only complicated to operate, but also the worker is easy to be scalded by the nozzle heating assembly during adjusting the nut.

[0047] To solve the above problems, please refer to Figure 3The application discloses a micro-droplet spraying body 10, which comprises a shell 1 and a piezoelectric module 2, the shell 1 is internally formed with a mounting space; the piezoelectric module 2 comprises a piezoelectric ceramic 21, a lever assembly 22 and a first adjusting assembly 23, the lever assembly 22 comprises a lever 221, a rotating shaft seat 222 and a rotating shaft 223, the rotating shaft seat 222 is mounted in the mounting space, the rotating shaft 223 is fixedly connected to the rotating shaft seat 222, the lever 221 is arranged above the rotating shaft 223 and can rotate relative to the rotating shaft 223; the first adjusting assembly 23 comprises an adjusting seat 231, an adjusting rod 232, a spring seat 233 and a pre-pressing spring 234, the adjusting seat 231 is mounted in the mounting space, the adjusting seat 231 is formed with a through cavity penetrating in the up-down direction, the spring seat 233 is clamped in the through cavity, the pre-pressing spring 234 is arranged in the spring seat 233 in the vertical direction, and the adjusting rod 232 is connected to the adjusting seat 231; the pre-pressing spring 234 is arranged in parallel with the piezoelectric ceramic 21, the lever 221 has a first end and a second end in the length direction, the piezoelectric ceramic 21 is arranged at the top of the first end, the pre-pressing spring 234 is arranged at the bottom of the second end, and the adjusting rod 232 can drive the adjusting seat 231 to be adjusted in the up-down direction relative to the shell 1, so that the relative position of a striker 2031 and a nozzle 202 is adjusted.

[0048] The technical scheme of the present application provides a micro-droplet ejection main body 10, comprising a shell 1 and a piezoelectric module 2, the shell 1 is provided with a mounting space to mount the piezoelectric module 2, the piezoelectric module 2 is composed of a piezoelectric ceramic 21, a lever assembly 22 and a first adjusting assembly 23, wherein the pivot seat 222 of the lever assembly 22 is fixed in the mounting space, the pivot 223 is hinged with the pivot seat 222, so that the lever 221 can swing around the fixed axis, thereby amplifying the slight elongation of the piezoelectric ceramic 21 in the vertical direction to a larger displacement of the second end of the lever 221. The adjusting seat 231 in the first adjusting assembly 23 is also provided in the mounting space, and the through cavity passing through the adjusting seat 231 provides a guide for the spring seat 233, and the spring seat 233 is hung on the support pin 235 fixed in the shell 1; the pre-pressing spring 234 is arranged inside the spring seat 233, and the elastic restoring force of the pre-pressing spring 234 continuously applies an upward pushing force to the second end of the lever 221, and the pushing force is converted into a pre-pressing force on the piezoelectric ceramic 21 through the lever 221, so that the piezoelectric ceramic 21 always works in a compressed state. The adjusting rod 232 is connected with the adjusting seat 231, and the adjusting rod 232 drives the adjusting seat 231 to move up and down as a whole through the lifting action of the adjusting rod 232, so as to realize the adjustment of the relative position of the striking pin 2031 and the nozzle 202, thereby realizing the control of the spraying state of the glue line during the glue spraying process of the micro-droplet ejection device 100, improving the convenience of adjustment. The piezoelectric ceramic 21 is located at the top of the first end of the lever 221, and the pre-pressing spring 234 is located at the bottom of the second end, forming a force closed loop of the piezoelectric ceramic 21-lever 221-pre-pressing spring 234. The lever 221 serves as a force amplification mechanism, which couples the mechanical pre-tightening force of the pre-pressing spring 234 and the electrically controlled displacement of the piezoelectric ceramic 21 at both ends of the lever 221, realizing high-precision amplification of micro-displacement and closed-loop control of force. Through the above structure, the micro-droplet ejection main body 10 can complete the generation, amplification and adjustment of force in a small volume, while ensuring that the piezoelectric ceramic 21 is always in a safe stress interval, prolonging its service life.

[0049] In an optional embodiment, in order to realize the support and limiting of the adjusting seat 231 in the shell 1, please refer to Figures 3 to 5 , the first adjusting assembly 23 further comprises a support pin 235 and a limiting pin 236, both of which comprise two support pins 235, which are spaced apart and clamped in the shell 1, and the two ends of the spring seat 233 are respectively lapped on the two support pins 235;

[0050] Two limiting pins 236 are clamped in the housing 1 in the horizontal direction and are located above the two supporting pins 235. The opposite sides of the side wall of the adjusting seat 231 are formed with openings. The supporting pins 235 and the limiting pins 236 are located in the openings. The limiting pins 236 can abut against the top wall of the opening to limit the stroke of the downward movement of the adjusting seat 231. The two supporting pins 235 are clamped in the housing 1 in the horizontal direction to form fixed supporting points. The spring seat 233 is lapped on the supporting pins 235 at both ends, so that the gravity of the spring seat 233 and the reaction force of the pre-pressing spring 234 are transmitted to the housing 1 through the supporting pins 235, avoiding that the adjusting seat 231 directly bears the shearing force and improving the structural reliability. The two limiting pins 236 are clamped in the housing 1 in the horizontal direction and are located above the supporting pins 235. The side wall of the adjusting seat 231 is formed with an opening. On the one hand, the opening facilitates the supporting or interference of the supporting pins 235 and the limiting pins 236 on the first adjusting assembly 23. On the other hand, the opening also facilitates the installation of the supporting pins 235 and the limiting pins 236, reducing the overall width of the micro-droplet ejection main body 10. Specifically, the spring seat 233 is lapped on the supporting pins 235 to realize the installation and positioning of the spring seat 233 in the housing 1. The bottom wall of the opening on the two sides of the adjusting seat 231 is located at a certain distance from the supporting pins 235, so as to avoid the interference of the adjusting seat 231 with the supporting pins 235 when the adjusting seat 231 is adjusted in the lifting adjustment. The limiting pins 236 are arranged to limit the adjusting stroke of the adjusting seat 231. When the adjusting seat 231 is moved downward by a certain distance, the limiting pins 236 abut against the top wall of the opening, preventing the adjusting seat 231 from continuing to move downward and falling out of the housing 1, thereby ensuring the normal work of the micro-droplet ejection main body 10.

[0051] In an optional embodiment, in order to facilitate the lifting adjustment of the adjusting seat 231 in the housing 1, please refer to Figure 3 and Figure 5 The first adjusting assembly 23 further comprises a nut 237 and a threaded column 238. The outer peripheral wall of the adjusting rod 232 is formed with a limiting step. The threaded column 238 is sleeved on the adjusting rod 232 and the top surface thereof abuts against the limiting step. The nut 237 is screwed with the adjusting column. The top of the nut 237 abuts against the bottom wall of the threaded column 238. The threaded column 238 is formed with external threads. The top end of the adjusting seat 231 is formed with internal threads matched with the external threads. The adjusting rod 232 is rotated relative to the housing 1 to drive the adjusting seat 231 to move up and down in the installation space.

[0052] Specifically, one end of the adjusting rod 232 extends into the shell 1 and is connected with the threaded column 238 and the nut 237, and the other end is exposed outside the shell 1 and is connected with a knob or handle for rotating operation by the operator. The position where the adjusting rod is connected with the outside of the shell 1 is sealed by the gasket 244 and the sealing ring to avoid the interference of external dust, water vapor and other interference into the inside of the shell 1 from the connecting gap. The limiting step of the outer circumferential wall of the adjusting rod 232 abuts against the top surface of the threaded column 238 to lock the axial position of the threaded column 238. The nut 237 is screwed with the adjusting rod and abuts against the bottom wall of the threaded column 238 to achieve the connection and fixation of the threaded column 238 on the adjusting rod 232. The travel of the threaded column 238 is limited from both ends by the limiting step provided on the adjusting rod and the nut 237 to prevent the axial movement of the threaded column 238 during the rotation of the adjusting rod 232. The external thread of the threaded column 238 cooperates with the internal thread at the top end of the adjusting seat 231 to convert the rotary motion of the adjusting rod 232 into the linear lifting of the adjusting seat 231, so as to achieve the lifting adjustment of the installation position of the adjusting seat 231 in the shell 1 and realize the relative position of the adjusting striker 2031 and the nozzle 202.

[0053] In an optional embodiment, in order to facilitate the adjustment of the pre-pressing force of the top of the piezoelectric ceramic 21, please refer to Figures 3 to 5 The second adjusting assembly 24 further includes a ceramic ball 241, a concave block 242, a torque screw 243, a gasket 244 and a screw 245. The gasket 244 and the torque screw 243 are sequentially arranged in 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 gasket 244. The ceramic ball 241 is arranged at the top of the piezoelectric ceramic 21, and the top of the ceramic ball 241 abuts against the arc-shaped groove.

[0054] The ceramic ball 241, the concave block 242, the torque screw 243, the gasket 244 and the screw 245 are arranged to optimize the force transmission path of the top of the piezoelectric ceramic 21. 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. An arc-shaped pit 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 the side facing the lever 221 is formed with a long strip-shaped arc-shaped pit 201a. Correspondingly, the lever 221 is formed with a long strip-shaped arc-shaped protrusion. The pit 201a and the protrusion are correspondingly matched to realize the positioning and installation of the piezoelectric ceramic 21.

[0055] The ceramic ball 241 is made of ceramic material with high hardness and low friction coefficient, is arranged on the top of the piezoelectric ceramic 21, converts the concentrated load transmitted by the lever 221 into point contact, and significantly reduces the contact stress concentration. The bottom of the concave block 242 is processed with an arc-shaped groove, and the concave block 242 forms a ball-and-socket cooperation with the ceramic ball 241. The curvature radius of the arc-shaped groove is slightly larger than the radius of the ceramic ball 241, so that the contact point is always located directly above the center of the ceramic ball 241 when the piezoelectric ceramic 21 is elongated or contracted, and lateral component is avoided in the horizontal direction. In addition, the ceramic ball 241 as an intermediate transition part can reduce the machining precision requirement of related parts. At the same time, during the assembly process of the micro-droplet ejection main body 10, the ceramic ball 241 can be self-adaptively adjusted to avoid damage to the piezoelectric ceramic 21 caused by a large component. The torque screw 243 is gap-fitted with the concave block 242, and is axially pre-tightened through the gasket 244 and the screw 245. The tightening torque of the torque screw 243 can be accurately set to ensure that the contact force between the ceramic ball 241 and the arc-shaped groove is constant, and the stability and repeatability of force transmission are further improved. Through the above structure, the axial force received by the piezoelectric ceramic 21 is uniformly distributed, the micro-crack expansion caused by the eccentric load is reduced, and the reliability of the device is improved.

[0056] When the micro-droplet ejection main body 10 works, the concave block 242 is pressed downward after the torque screw 243 rotates, and the pre-pressure is transmitted to the pre-pressing spring 234 through the ceramic ball 241, the piezoelectric ceramic 21 and the lever 221. The pre-pressing spring 234 is compressed to store energy, and the piezoelectric ceramic 21 also stores energy under the action of the pre-pressing spring 234. The gasket 244 is clamped at the step of the shell 1, and when the torque screw 243 is rotated to the appropriate position, the screw 245 connects the gasket 244 and the torque screw 243, eliminating the connection backlash between the torque screw 243 and the shell 1. When the piezoelectric ceramic 21 works under the action of the electric field, the displacement is more reliable, and the force and displacement of the piezoelectric ceramic 21 transmitted to the end striker 2031 are more accurate.

[0057] In an optional embodiment, in order to monitor the working state of the piezoelectric ceramic 21, please refer to Figure 3 and Figure 5 The micro-droplet ejection main body 10 further comprises a control panel 3 and a first temperature sensor 4. The control panel 3 is arranged in the installation space and spaced apart from the piezoelectric ceramic 21 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.

[0058] Specifically, the control board 3 is connected with the first temperature sensor 4 through the connecting cable 7 to connect an external controller, so as to transmit the service life and temperature value of the piezoceramic 21 to the controller, and the controller is connected with the piezoceramic 21 through the connecting cable 7 to control the working of the piezoceramic 21. In the embodiment, the first temperature sensor 4 is a PT100 sensor. The control board 3 is arranged at intervals with the piezoceramic 21 to avoid electromagnetic interference, and the driving current, voltage and impedance change of the piezoceramic 21 are transmitted to the external controller to calculate the aging degree of the piezoceramic by means of an algorithm, so as to evaluate the remaining service life of the piezoceramic; the first temperature sensor 4 is attached to the side wall of the piezoceramic 21 to collect the temperature of the piezoceramic in real time, so as to prevent depolarization failure caused by overheating. Through the cooperative working of the control board 3 and the first temperature sensor 4, a warning can be sent in time when the performance of the piezoceramic is attenuated or the temperature is abnormal, so as to remind the user to maintain or replace, and avoid production loss caused by sudden stop.

[0059] In an optional embodiment, in order to realize heat dissipation treatment of the piezoceramic 21 inside, and guarantee the normal working of the piezoceramic 21, please refer to Figure 2 , the micro-droplet ejection body 10 further comprises an air inlet nozzle 51 and an air outlet nozzle 52, the air inlet nozzle 51 and the air outlet nozzle 52 are communicated with the installation space, the air inlet nozzle 51 is used to connect an air inlet pipeline, and the air outlet nozzle 52 is used to connect an air outlet pipeline, so as to input compressed air to perform heat dissipation on the piezoceramic 21.

[0060] By increasing the air inlet nozzle 51 and the air outlet nozzle 52 on the top of the shell 1, a compressed air circulation cooling channel is constructed. The air inlet nozzle 51 is connected with an external compressed air pipeline to introduce low-temperature dry air into the installation space; after the airflow sweeps over the surface of the piezoceramic 21, the airflow carrying heat is discharged from the air outlet nozzle 52 to form forced convection heat dissipation. The flow and temperature of the compressed air can be accurately controlled through an external pressure regulating valve and a cold dryer, so as to ensure that the piezoceramic 21 still maintains constant temperature when working at high frequency; at the same time, the airflow can also carry away dust and volatile matters in the installation space to reduce the corrosion of the piezoceramic 21 and the lever assembly 22 by pollutants. This is helpful to improve the service life of the micro-droplet ejection body 10 and guarantee long-term stable operation.

[0061] In an optional embodiment, in order to facilitate the assembly of the micro-droplet ejection body 10 and the fluid assembly 20, please refer to Figure 3 , Figures 5 to 7The micro-droplet ejection body 10 further comprises a fluid mounting assembly 6, which comprises a rotating shaft 61, a fastening ball 62, a pre-tightening spring 63 and a wrench 64. The outer circumferential wall of the rotating shaft 61 is extended to form an installation groove 61a with gradually changing depth. The adjusting seat 231 and the shell 1 jointly form a rotating shaft 223 mounting cavity. The rotating shaft 61 is arranged in the rotating shaft 223 mounting cavity in an axial direction, and the other end of the rotating shaft 61 partially 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 arranged in the connecting channel and abuts against the installation groove 61a at one end. The wrench 64 can drive the rotating shaft 61 to rotate so that the end of the fastening ball 62 away from the rotating shaft 61 is exposed in the through cavity. The pre-tightening spring 63 is sleeved on the rotating shaft 61, and the two axial ends of the pre-tightening spring 63 abut against the bottom wall of the shell 1 and the rotating shaft 61, respectively.

[0062] The rotating shaft 61 is provided with the installation groove 61a with gradually changing depth in the outer circumferential wall. When the operator twists the wrench 64 to drive the rotating shaft 61 to rotate, the groove depth of the cooperation part of the rotating shaft 61 and the fastening ball 62 gradually changes, so that the rotating shaft 61 pushes the fastening ball 62 to move in the axial direction along the connecting channel. One end of the fastening ball 62 abuts against the installation groove 61a, and the other end extends into the through cavity when the rotating shaft 61 rotates to a specific angle, so as to abut against and lock the mounting seat 201 of the fluid assembly 20. The pre-tightening spring 63 is sleeved on the rotating shaft 61, and the side of the rotating shaft 61 facing the pre-tightening spring 63 is formed with an annular groove. The end of the pre-tightening spring 63 is clamped in the annular groove. The inner side wall of the annular groove can limit the radial displacement of the pre-tightening spring 63, so as to guarantee the stability of the connection between the pre-tightening spring 63 and the rotating shaft 61 and reduce the radial deviation of the pre-tightening spring 63 when it is compressed and reset. By arranging the pre-tightening spring 63, on the one hand, the rotating shaft 61 can be flexibly rotated relative to the shell 1. On the other hand, the reaction force of the pre-tightening spring 63 on the rotating shaft 61 can guarantee the stable and reliable cooperation between the rotating shaft 61 and the fastening ball 62, so as to guarantee the reliability and stability of the fluid mounting assembly 6. Through the structure, the operator can complete the mounting and dismounting of the fluid assembly 20 within a few seconds without tools, which greatly shortens the maintenance time.

[0063] The application further provides a micro-droplet ejection device 100, which comprises a micro-droplet ejection body 10 and a fluid assembly 20, the fluid assembly 20 comprises a mounting seat 201 and a striker assembly 203, the mounting seat 201 is internally formed with a mounting cavity, the bottom end of the mounting cavity is connected with a nozzle 202, the striker assembly 203 comprises a striker 2031 and a striker spring 2032, the striker 2031 is arranged in the mounting cavity, the striker spring 2032 is sleeved on the striker 2031, the striker spring 2032 is compressed when the striker 2031 moves downward, the mounting seat 201 and the striker 2031 enclose a glue injection cavity, the striker 2031 can move up and down along the mounting seat 201 to extrude the glue in the glue injection cavity to the nozzle 202 for ejection. The specific structure of the micro-droplet ejection body 10 is referred to the above-mentioned embodiments, since the micro-droplet ejection device 100 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Please refer to Figures 8 to 10 The mounting seat 201 is internally provided with a mounting cavity, the mounting cavity provides mounting space for the striker assembly 203, the bottom end of the mounting cavity is directly connected with the nozzle 202, so that the glue can smoothly flow to the nozzle 202 under the action of the striker assembly 203. The striker assembly 203 is composed of the striker 2031 and the striker spring 2032, the striker 2031 is arranged in the mounting cavity, the top end of the striker 2031 cooperates with the striker spring 2032, the striker spring 2032 is sleeved on the outer periphery of the striker 2031, the striker 2031 can compress the striker spring 2032 to accumulate elastic potential energy when moving downward, and the striker 2031 can move and reset in the mounting cavity by the elastic potential energy of the striker spring 2032 when losing the downward pressure. The mounting seat 201 and the striker 2031 enclose a glue injection cavity as a temporary storage area of the glue, the striker 2031 extrudes the glue in the cavity when descending, and the glue is accurately ejected in the form of micro-droplets through the nozzle 202. The mechanical linkage of the striker 2031 and the striker spring 2032 realizes the quantitative delivery of the glue, the design that the nozzle 202 is directly connected with the mounting cavity shortens the glue delivery path, reduces the risk of glue residue and solidification in the delivery process, realizes high-precision and high-frequency micro-droplet ejection, and is especially suitable for the micro-droplet ejection scene of high-viscosity or fast-solidification glue.

[0064] In an optional embodiment, in order to guarantee the reliability of the up-and-down movement of the striker 2031, please refer to Figures 8 to 10 The fluid assembly 20 further comprises a guide sleeve 204, the guide sleeve 204 is sleeved on the striker 2031 and is arranged in 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 clamped in the mounting cavity.

[0065] The guide sleeve 204 is a hollow sleeve made of annular metal or engineering plastic, sleeved on the outer periphery of the striker 2031 and extending axially along the striker 2031, the top wall of which abuts against the bottom end of the striker spring 2032, and the outer peripheral wall is clamped in the mounting cavity. The guide sleeve 204 controls the coaxial movement of the striker 2031, avoiding the deflection of the striker 2031 due to lateral force during lifting. The cooperation between the guide sleeve 204 and the striker 2031 not only ensures smooth sliding of the striker 2031, but also prevents leakage of the colloid from the gap. This structure limits the reciprocating movement of the striker 2031 to a single axial degree of freedom, significantly reducing the probability of nozzle 202 blockage caused by the inclination of the striker 2031. At the same time, the striker spring 2032 transmits pressure through the guide sleeve 204, making the striker 2031 bear uniform force and prolonging the fatigue life of the striker spring 2032, which also facilitates smooth movement of the striker 2031 in the mounting cavity.

[0066] In an optional embodiment, to further improve the sealing effect in the mounting cavity, please refer to Figure 9 and Figure 10 The fluid assembly 20 further comprises a flooding plug 205, a step is formed in the mounting seat 201, the flooding plug 205 is sleeved on the striker 2031 and clamped in the step, and the side of the guide sleeve 204 away from the striker spring 2032 abuts against the flooding plug 205.

[0067] A stepped step is processed on the inner wall of the mounting cavity, the flooding plug 205 is sleeved on the striker 2031 and clamped at the step, and the lip of the flooding plug 205 is self-adapted to tightly contact the surface of the striker 2031 under the pressure of the colloid. The lower end surface of the guide sleeve 204 abuts against the upper end surface of the flooding plug 205, forming a double sealing structure: the flooding plug 205 prevents the colloid from leaking upward along the striker 2031, and the guide sleeve 204 prevents the flooding plug 205 from moving axially by mechanical compression. The sealing function and the guiding function are separated, and the flooding plug 205 only undertakes the sealing task, avoiding the sealing failure caused by the wear of the guide sleeve 204, and at the same time, the axial positioning of the guide sleeve 204 to the flooding plug 205 prevents the sealing ring from being turned over and failing under the impact of high-pressure colloid, further improving the stability of the working of the fluid assembly 20. Optionally, the flooding plug 205 can be a sealing ring made of fluororubber, polyurethane, butyronitrile rubber, ethylene propylene rubber, polytetrafluoroethylene lip, etc., which can be specifically selected according to the glue or actual application scene.

[0068] In an optional embodiment, to facilitate the installation of the guide sleeve 204 in the mounting cavity, please refer to Figure 10 The end of the guide sleeve 204 close to the flooding plug 205 is formed with an emptying groove 204a, which extends along the radial direction of the guide sleeve 204.

[0069] The air-avoiding groove 204a is a straight groove arranged on the bottom and extending radially along the guide sleeve 204. When the guide sleeve 204 is installed, the air-avoiding groove 204a can accommodate a part of air to facilitate the close fit between the guide sleeve 204 and the inner wall of the mounting seat 201, so as to avoid the air between the guide sleeve 204, the mounting seat 201 and the plug 205 from being discharged, which causes the guide sleeve 204 to be difficult to be pressed and results in the installation out of position. In addition, by arranging the air-avoiding groove 204a, when the plug 205 is not replaced in time due to damage, the glue upwardly moving through the plug 205 can overflow out of the housing 1 through the air-avoiding groove 204a of the guide sleeve 204 and the opening of the sidewall of the mounting seat 201, and will not move into the interior of the micro-droplet ejection main body 10 to cause damage to the micro-droplet ejection main body 10.

[0070] In an optional embodiment, in order to facilitate the stable installation of the nozzle 202, please refer to Figures 8 to 10 The fluid assembly 20 further comprises a nut 206, the inner peripheral wall of the nut 206 is provided with an internal thread, the outer peripheral wall of the mounting seat 201 is provided with an external thread, the internal thread and the external thread are screw-connected to clamp the top end of the nozzle 202 between the bottom wall of the mounting seat 201 and the bottom wall of the nut 206 facing the side of the mounting seat 201, and the bottom wall of the nut 206 is provided with a through hole, and the bottom end of the nozzle 202 extends outwardly through the through hole.

[0071] The nut 206 is a cover-shaped structure with an internal thread and a through hole formed at the bottom, and the outer wall of the mounting seat 201 is provided with a matching external thread. By rotating the nut 206, the bottom surface of the mounting seat 201 and the inner bottom surface of the nut 206 form a clamping force to fix the top end of the nozzle 202. The through hole formed on the bottom wall of the nut 206 allows the tip of the nozzle 202 to extend out. Specifically, the bottom wall of the mounting seat 201 is formed with a positioning hole, the top end of the nozzle 202 is clamped in the positioning hole to achieve radial limiting, and the clamping force generated between the nut 206 and the mounting seat 201 achieves axial fixation of the nozzle 202, thereby ensuring the accuracy and stability of the installation of the nozzle 202, and further ensuring the stability of the fluid ejection. In addition, this structure is also conducive to the quick replacement of the nozzle 202: when the nozzle 202 is blocked by the solidification of glue or worn out, the nozzle 202 can be removed by loosening the nut 206, without the need to disassemble the entire fluid assembly 20, thereby significantly reducing the maintenance time. Moreover, the arrangement of the nut 206 can also protect the position of the bottom of the mounting seat 201, so as to reduce the damage of the mounting seat 201 caused by external collision and other interference.

[0072] In an optional embodiment, in order to facilitate the stable installation of the nozzle 202, please refer to Figures 8 to 10The fluid assembly 20 further comprises a glue inlet nozzle 207, a glue inlet nozzle base 208, and a flow channel 209. The glue inlet nozzle 207 is connected to the glue inlet nozzle base 208. The flow channel 209 has two ends connected to the glue inlet nozzle base 208 and the mounting base 201 respectively. The glue inlet nozzle 207, the glue inlet nozzle base 208, the flow channel 209, and the mounting base 201 are sequentially connected and internally form a glue passage.

[0073] The bottom end of the glue inlet nozzle 207 is connected to the glue inlet nozzle base 208, and the top end is connected to a needle cylinder 301 through a luer connector or a threaded connection. The glue inlet nozzle base 208 is a transition piece, and its interior is connected to the glue inlet nozzle 207. The flow channel 209 connects the glue inlet nozzle base 208 and the mounting base 201, and the interiors of the three form a continuous glue passage. The modular design of the glue inlet nozzle base 208 allows the use of different lengths of flow channels 209 to adapt to different installation spaces. In addition, the flow channel 209 can be made of metal to resist corrosive glue. The connection parts of the glue inlet nozzle 207 and the glue inlet nozzle base 208, the glue inlet nozzle base 208 and the flow channel 209, and the flow channel 209 and the mounting base 201 are all provided with sealing rings to achieve sealed connection.

[0074] In an optional embodiment, to facilitate the cleaning and maintenance of the flow channel 209, the fluid assembly 20 further comprises a plug 210 connected to the end of the flow channel 209 away from the mounting base 201 to achieve lateral sealing of the glue passage.

[0075] Because the flow direction of the glue needs to change from the glue inlet nozzle 207 to the mounting base 201, there is a corner in the flow channel 209 to change the flow direction of the glue. When the glue flows to the corner, it is easy to be retained at the corner position due to flow resistance, and a part of the glue may solidify at the corner position after a long time of work, causing the flow channel 209 to be blocked. Therefore, to facilitate the regular cleaning and maintenance of the flow channel 209, a detachable plug 210 is provided at the corner of the flow channel 209 to facilitate the opening of the flow channel 209 for cleaning. The plug 210 is connected to the end of the flow channel 209 by a threaded connection, and the outer peripheral wall and the inner wall of the flow channel 209 form a metal hard seal, and a sealing ring is provided at the connection to improve the sealing effect. When the flow channel 209 is cleaned and maintained, a closed port is provided to prevent glue from leaking from the non-working end. The end of the plug 210 can be processed into an internal hexagonal or a slot, which facilitates quick disassembly and assembly using standard tools.

[0076] In an alternative embodiment, to facilitate heating of the needle cylinder and the nozzle 202, the droplet ejection device 100 further comprises a needle cylinder assembly 30 and a nozzle heating assembly 40. The needle cylinder assembly 30 comprises a needle cylinder and a needle cylinder heating structure. The needle cylinder has a cavity formed therein for accommodating the glue, and a bottom end of the needle cylinder is in communication with the glue nozzle 207. The needle cylinder heating structure is connected to the outer peripheral wall of the needle cylinder to heat the needle cylinder. The nozzle heating assembly 40 comprises a flow channel mounting base and a heating structure. The flow channel mounting base has a mounting surface, and 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 needle cylinder heating structure comprises an outer cover, a needle cylinder mounting member, a heating sheet, and a connecting member. The needle cylinder mounting member has a cavity for accommodating the needle cylinder. The outer cover is sleeved on the needle cylinder mounting member, and an installation space is formed between the inner peripheral wall of the outer cover and the outer peripheral wall of the needle cylinder mounting member. The heating sheet is wrapped around the outer peripheral wall of the needle cylinder mounting structure and is arranged in the installation space. The connecting member is electrically connected to the heating sheet to heat the needle cylinder.

[0078] Please refer to Figure 11 The flow channel mounting base comprises a heating block 401, a temperature insulation block 402, and a mounting block 403. The heating block 401, the temperature insulation block 402, and the mounting block 403 are sequentially connected and have a mounting surface formed at the top. The flow channel 209 is arranged on the mounting surface. The bottom of the heating block 401 has a through hole for the screw cap 206 to pass through. The end of the heating block 401 away from the temperature insulation block 402 has an adjustable opening. The two sides of the opening are connected by a fastening screw 401a. By rotating the fastening screw 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, and the side wall of the screw cap 206 is clamped by the heating block 401, achieving fixed connection of the heating block 401 and the screw cap 206. At the same time, the heating block 401 can 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] Fifthly, install the needle cylinder 301 heating assembly on the fluid ejection body 21a. Figure 14 ).

[0086] Sixthly, install the nozzle heating assembly 40 on the micro-droplet ejection body 21a, and then tighten the fastening screw 401a on the side of the nozzle heating assembly 40, to complete the installation of the entire micro-droplet ejection device 100. Figure 15 ).

[0087] The micro-droplet ejection device 100 in the scheme modifies the installation mode of the piezoelectric ceramic 21 driving part, reduces the horizontal force and displacement of the piezoelectric ceramic 21, makes the force and displacement of the piezoelectric ceramic 21 transmitted to the lever 221 more accurate, reduces the probability of piezoelectric ceramic 21 assembly scrap, and improves the working life of the piezoelectric ceramic 21.

[0088] The fluid assembly 20 is connected with the micro-droplet ejection body 10 in a quick release type installation mode, simplifies the installation mode, shortens the maintenance time, and improves the working efficiency. The micro-droplet ejection device 100 adjusts the lifting adjustment of the adjusting seat 231 by adjusting the knob of the adjusting rod 232 on the micro-droplet ejection body 10, so as to adjust the relative position of the nozzle 202 and the striker 2031, simplifies the operation mode, and avoids the staff from being scalded by the nozzle heating assembly 40 in the process of adjusting the nut 206. The structure design of the nozzle heating assembly 40 is optimized, and the heating of the nozzle 202 and the flow channel 209 is realized at the same time, so that the difference between the actual measured temperature of the temperature sensor in the nozzle heating assembly 40 and the actual required temperature of the nozzle 202 is reduced.

[0089] The temperature and service life of the piezoelectric ceramic 21, which is the power element of the fluid micro-droplet ejection body 10, are monitored; PT100 is used to be attached to the surface of the piezoelectric ceramic 21, and the monitored temperature is transmitted to the controller. The service life monitoring module of the piezoelectric ceramic 21 is packaged into a PCB small plate and built into the shell 1 of the fluid micro-droplet ejection body 10. In addition, the controller of the micro-droplet ejection device 100 in the scheme contains a control plate, the control plate integrates the heating function, can control the needle cylinder 301 heating assembly and the nozzle heating assembly 40, so that only one controller can control the three modules in the micro-droplet ejection device 100.

[0090] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A microdroplet ejection body characterized by, The utility model relates to a micro -drop jet body, including: The shell is formed with installation space in, the piezoelectric ceramic is arranged in the installation space, the piezoelectric ceramic is connected with the lever assembly, and the lever assembly is connected with the first adjusting assembly. The first adjusting assembly includes adjusting seat, adjusting lever, spring seat and pre -press spring, adjusting seat is installed in the installation space, adjusting seat is formed with the through cavity that goes up and down, spring seat is clamped in the through cavity, pre -press spring is arranged in the spring seat along the vertical direction, adjusting lever is connected with adjusting seat. The pre-press spring is parallel to the piezoelectric ceramic, the lever has the first end and the second end along the length direction, the piezoelectric ceramic is arranged at the top of the first end, the pre-press spring is arranged at the bottom of the second end, the adjusting lever can drive the adjusting seat to adjust the relative position of the striker and the nozzle. The first adjusting assembly further includes support pin and limit pin, the support pin and the limit pin are both two, two support pins are clamped in the shell along the horizontal direction, and the two ends of the spring seat are respectively overlapped on two support pins.

2. The droplet ejection body of claim 1, wherein, Two limit pins are clamped in the shell along the horizontal direction and located above two support pins, and opposite sides of the side wall of the adjusting seat are formed with openings, the support pin and the limit pin are located in the opening, and the support pin can abut against the top wall of the opening to limit the stroke of the adjusting seat. The first adjusting assembly further includes a nut and a threaded column, the outer peripheral wall of the adjusting lever is formed with a limiting step, the threaded column is sleeved on the adjusting lever and the top surface abuts against the limiting step, the nut is screwed with the adjusting column, the top of the nut abuts against the bottom wall of the threaded column, the threaded column is formed with external threads, and the top end of the adjusting seat is formed with internal threads matched with the external threads, and the adjusting lever is rotated relative to the shell to drive the adjusting seat to move up and down in the installation space.

3. The droplet ejection body of claim 2, wherein, The piezoelectric module further includes a pressure second adjusting assembly, the second adjusting assembly includes a ceramic ball, a concave block, a torque screw, a gasket and a screw, the gasket and the torque screw are sequentially arranged in the direction close to the piezoelectric ceramic, the concave block is connected to the bottom of the torque screw, the side of the concave block away from the gasket is formed with an arc-shaped groove, the ceramic ball is arranged on the top of the piezoelectric ceramic, and the top of the ceramic ball abuts against the arc-shaped groove.

4. The droplet ejection body of claim 3, wherein, The micro -drop jet body further includes a control panel and a first temperature sensor, the control panel is arranged in the installation space and spaced apart from the piezoelectric ceramic to monitor the service life of the piezoelectric ceramic, and the temperature sensor is connected to the side wall of the piezoelectric ceramic to monitor the temperature of the piezoelectric ceramic.

5. The droplet ejection body of any of claims 1 to 4, wherein, ​ 6. The droplet ejection body of claim 5, wherein, The micro-droplet ejection body further comprises an air inlet nozzle and an air outlet nozzle, the air inlet nozzle and the air outlet nozzle being in communication with the mounting space, the air inlet nozzle being used to connect an air inlet pipeline, and the air outlet nozzle being used to connect an air outlet pipeline, so as to input compressed air to dissipate heat of the piezoelectric ceramic.

7. The droplet ejection body of claim 5, wherein, The micro-droplet ejection body further comprises a fluid mounting assembly, the fluid mounting assembly comprising a rotating shaft, a fastening ball, a pre-tightening spring and a wrench, an outer peripheral wall of the rotating shaft extending to form a mounting groove with gradually shallower / deeper depth, the adjusting seat and the shell enclosing a rotating shaft mounting cavity, one end of the rotating shaft being arranged in the rotating shaft mounting cavity, the other end of the rotating shaft partially extending out of the rotating shaft mounting cavity and being connected to the wrench, a connecting channel being formed between the through cavity and the rotating shaft mounting cavity, the fastening ball being arranged in the connecting channel and abutting against the mounting groove at one end, the wrench being capable of driving the rotating shaft to rotate so that the fastening ball exposed at one end away from the rotating shaft is exposed in the through cavity, and the pre-tightening spring being sleeved on the rotating shaft, two ends of the pre-tightening spring in the axial direction abutting against the bottom wall of the shell and the rotating shaft respectively.

8. A droplet ejection device, characterized by, The micro-droplet ejection body as claimed in any one of claims 1 to 7, and The fluid assembly comprises a mounting seat and a striker assembly, a mounting cavity is formed in the mounting seat, a nozzle is connected to a bottom end of the mounting cavity, the striker assembly comprises a striker and a striker spring, the striker is arranged in the mounting cavity, and the striker spring is sleeved on the striker, the mounting seat and the striker enclose a glue injection cavity, and the striker is capable of moving up and down along the mounting seat to extrude glue in the glue injection cavity to be sprayed out of the nozzle.

9. The droplet ejection device of claim 8, wherein, The fluid assembly further comprises 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, two ends of the flow channel in the length direction are connected to the glue inlet nozzle base and the mounting seat respectively, and the glue inlet nozzle, the glue inlet nozzle base, the flow channel and the mounting seat are sequentially in communication and internally form a glue passage.

10. The droplet ejection device of claim 9, wherein, The micro-droplet ejection device further comprises a needle cylinder assembly and a nozzle heating assembly. The needle cylinder assembly comprises a needle cylinder and a needle cylinder heating structure, a containing cavity is formed in the needle cylinder to contain glue, a bottom end of the needle cylinder is in communication with the glue inlet nozzle, and the needle cylinder heating structure is connected to an outer peripheral wall of the needle cylinder to heat the needle cylinder; The nozzle heating assembly comprises a flow channel mounting seat and a heating structure, the flow channel mounting seat forms a mounting face, the flow channel is mounted on the mounting face, and the heating structure is connected to the flow channel mounting seat to heat the flow channel.

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