Split type sealed piezoelectric driving ultramicro point glue valve body

Abstract

This invention discloses a split-type sealed piezoelectric-driven ultra-micro dispensing valve body, which relates to the field of precision dispensing equipment technology. It includes a piezoelectric module, a valve body, and a dispensing head. The piezoelectric module and the valve body are detachably connected. The valve body has an internal glue storage chamber with a sleeve fixed at the bottom. A movable valve is slidably connected inside the sleeve, with its top contacting the bottom of an inserted piezoelectric probe. A glue inlet pipe is connected to the side of the glue storage chamber, and the end of the inlet pipe away from the valve body is connected to a glue supply device. The bottom of the valve body has a groove with a connecting seat inserted inside. The dispensing head is elastically connected inside the connecting seat, which also contains a vibration drive component, including a vibrating metal plate that contacts the side of the dispensing head. This invention effectively eliminates residual glue clogging and stringing defects, and has the advantages of wide adaptability, high stability, and long service life, significantly improving the production yield and automated continuous operation capability of precision ultra-micro dispensing.

Description

Technical Field

[0001] This invention belongs to the technical field of precision dispensing equipment, and particularly relates to a split-type sealed piezoelectric driven ultra-micro dispensing valve body. Background Technology

[0002] Ultra-micro dispensing technology is widely used in high-end precision manufacturing fields such as semiconductor packaging, precision electronic assembly, medical device manufacturing, and micro-optical device packaging. As the core actuator of dispensing equipment, the dispensing valve body directly determines the product processing quality and production efficiency through its dispensing accuracy, sealing performance, residual adhesive cleaning ability, and ease of disassembly and maintenance.

[0003] Currently, most mainstream ultra-micro dispensing valve bodies on the market adopt an integrated structure, primarily driven by pneumatic or electromagnetic forces, with a few using simple piezoelectric drive structures. Existing technologies suffer from several core defects: First, the integrated valve body structure has a high degree of integration, with the piezoelectric drive module, dispensing head, and glue reservoir forming a single fixed structure. This means that individual components cannot be disassembled and replaced after wear or glue blockage, resulting in extremely high overall maintenance costs. Furthermore, the disassembly and assembly process easily damages the valve body's sealing structure, leading to glue leakage and pressure loss. Second, traditional piezoelectric dispensing valve bodies have a simple sealing structure, relying solely on a single-layer sealing ring for probe penetration sealing. During the high-frequency reciprocating extension and retraction of the piezoelectric probe, seal wear and eccentric misalignment easily occur, resulting in gap glue leakage. Simultaneously, the lack of a damping buffer structure means that probe impact and vibration can easily cause fluctuations in dispensing flow, hindering ultra-micro dispensing... The precision of the adhesive is difficult to guarantee, making it unsuitable for ultra-fine dispensing requirements at the nano- and pixel-level. Thirdly, conventional dispensing valves rely solely on valve opening and closing to extrude the adhesive. After dispensing, adhesive residue easily remains inside the dispensing head. Once cured, this residue blocks the dispensing channel, causing defects such as dispensing interruptions, uneven dispensing, and stringing / tailing. This problem is particularly prominent for high-viscosity, easily curing adhesives, severely impacting the yield of precision products. Fourthly, traditional valves lack an auxiliary vibration cleaning structure, requiring manual disassembly and cleaning of residual adhesive. This results in low efficiency and can easily damage the valve's precision structure, making it unsuitable for automated continuous production.

[0004] In summary, existing micro-dispensing valve bodies suffer from technical drawbacks such as poor sealing, unstable precision, inconvenient maintenance, difficulty in cleaning residual adhesive, and poor adaptability. Therefore, there is an urgent need to develop a split-type sealed piezoelectric-driven micro-dispensing valve body. By adopting a split modular structure, multiple sealing damping design, and auxiliary vibration adhesive cleaning structure, this technology can solve many of the shortcomings of existing technologies and improve the stability and precision of micro-dispensing. Summary of the Invention

[0005] The purpose of this invention is to provide a split-type sealed piezoelectric-driven ultra-micro dispensing valve body. This invention adopts a split modular structure with multiple sealing damping designs, which solves the problems of poor sealing, low dispensing accuracy, and inconvenient maintenance of traditional dispensing valves. At the same time, through piezoelectric drive combined with a vibration-pneumatic linkage cleaning structure, it effectively eliminates residual glue blockage and stringing defects. It has the advantages of wide adaptability, high stability, and long service life, which greatly improves the production yield and automated continuous operation capability of precision ultra-micro dispensing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A split-type sealed piezoelectric-driven ultra-micro dispensing valve body includes a piezoelectric module, a valve body, and a dispensing head detachably installed at the bottom of the valve body. The piezoelectric module is detachably connected to the valve body. The piezoelectric probe of the piezoelectric module extends into the valve body. The valve body has a glue storage chamber inside, and a sleeve is fixed at the bottom of the glue storage chamber. A movable valve is slidably connected inside the sleeve. The top of the movable valve abuts against the bottom of the inserted piezoelectric probe. A glue inlet pipe is connected to the side of the glue storage chamber. The glue inlet pipe is connected to a glue supply device at the end away from the valve body. The bottom of the valve body has a groove, and a connecting seat is inserted into the groove. The dispensing head is elastically connected inside the connecting seat. A vibration drive component is also provided inside the connecting seat. The vibration drive component includes a vibrating metal plate, which abuts against the side of the dispensing head.

[0007] As a preferred embodiment of the present invention, the valve body is provided with a threaded hole at the top, and a plurality of threaded holes are provided at equal angles along the circumferential direction of the valve body. An extension plate is welded to the side of the piezoelectric module, and a limit post is welded to the side of the extension plate facing the valve body. The limit post is disposed through the extension plate.

[0008] As a preferred embodiment of the present invention, the valve body is provided with a through hole at the top for a piezoelectric probe to be inserted, and a sealing ring is fixed at the top of the glue storage cavity. The sealing ring is located below the through hole, and the top of the sealing ring is fixed to the top wall of the glue storage cavity.

[0009] As a preferred embodiment of the present invention, the sealing ring has a conical groove inside, through which a piezoelectric probe passes. An annular trapezoidal groove is provided on the side of the conical groove, and a damping rod is fixed inside the annular trapezoidal groove. Several damping rods are provided at equal angles along the circumference of the annular trapezoidal groove.

[0010] As a preferred embodiment of the present invention, the top of the sleeve extends into the interior of the glue storage cavity, and the side of the sleeve is provided with through grooves, and a plurality of through grooves are provided along the circumference of the sleeve.

[0011] As a preferred embodiment of the present invention, the movable valve is inclined near its top, and the top of the movable valve is provided with an arc-shaped groove. A magnet is embedded at the bottom of the arc-shaped groove, and the magnet is attracted and fixed to the piezoelectric probe.

[0012] As a preferred embodiment of the present invention, the top of the connecting seat is inserted into the outside of the sleeve, an air inlet pipe is fixedly inserted into the side of the connecting seat, a connecting pipe is provided inside the groove, the end of the connecting pipe inside the groove is connected to the air inlet pipe, the end of the connecting pipe away from the air inlet pipe extends along the side of the valve body, and an air pump is connected to the extended end of the connecting pipe, and the air pump screw is fixed to the side of the valve body.

[0013] As a preferred embodiment of the present invention, an elastic connecting ring is fixed inside the connecting seat. The elastic connecting ring has a V-shaped cross-section. The bottom of the elastic connecting ring is fixedly connected to the dispensing head. The elastic connecting ring has a plurality of through holes inside, which are inclined toward the dispensing head.

[0014] As a preferred embodiment of the present invention, the vibration drive component further includes a cavity disposed inside the connecting seat, a fixed seat fixed inside the cavity, the fixed seats being symmetrically arranged, a horizontal shaft fixed between the two fixed seats, the vibrating metal plate being rotatably connected to the outside of the horizontal shaft, a torsion spring being sleeved on the outside of the horizontal shaft, one end of the torsion spring being fixed to the side of the vibrating metal plate, and the other end being fixed to the side of the fixed seat, an arc-shaped trigger rod being fixed to the end of the vibrating metal plate away from the dispensing head, a cam being contacted inside the arc-shaped trigger rod, the cam being rotatably connected inside the cavity, a drive shaft being fixed at the center of the cam shaft, the drive shaft being rotatably connected inside the cavity, a servo motor being connected to the end of the drive shaft extending out of the connecting seat, the servo motor being connected in series with an air pump, and a hollow groove being provided at the top of the cavity, the hollow groove being used to avoid interference with the rotation of the cam.

[0015] In summary, the beneficial technical effects of the present invention are as follows: 1. This invention sets the piezoelectric drive module, valve body, dispensing head, and cleaning assembly as detachable separate structures, which is different from the traditional integrated valve body. After the parts are worn, blocked, or damaged, they can be disassembled and replaced individually without replacing the entire valve body, which greatly reduces equipment maintenance costs and downtime for repair. At the same time, the piezoelectric module is precisely positioned through limit pins and threaded holes, with high assembly accuracy. Disassembly and assembly will not damage the valve body sealing benchmark, and the stability of the equipment is not affected by disassembly and assembly.

[0016] 2. This invention features a dedicated sealing ring at the top of the adhesive storage chamber, combined with a conical adaptive sealing groove and an annular damping rod structure. This achieves a complete seal at the piezoelectric probe insertion point, effectively solving the problems of eccentricity and adhesive leakage, as well as seal wear, during the high-frequency extension and retraction of the piezoelectric probe. The damping rod buffers probe vibration and offset, suppressing transmission errors. Combined with the magnetic attraction and gapless transmission between the piezoelectric probe and the moving valve, it enables precise micro-displacement control at the micrometer level. The ultra-micro dispensing flow is uniform and highly stable, meeting the requirements of nano-level precision dispensing.

[0017] 3. This invention adds an independent vibration drive component and a pneumatic blowing component, and realizes electrical linkage control. After dispensing, high-frequency vibration cleaning and high-pressure airflow blowing can be completed simultaneously to quickly clean the residual glue inside the dispensing head, prevent residual glue from solidifying and blocking the dispensing channel, greatly increase the continuous working time of the equipment, adapt to the automated continuous dispensing production of high viscosity and easy-to-cure glue, and effectively improve the product processing yield. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a split-type sealed piezoelectric-driven ultra-micro dispensing valve body according to this embodiment; Figure 2 This embodiment describes a split-type sealed piezoelectric-driven ultra-micro dispensing valve body. Figure 1 A cross-sectional view; Figure 3 This embodiment describes a split-type sealed piezoelectric-driven ultra-micro dispensing valve body. Figure 2 Enlarged view of point A in the middle; Figure 4 This embodiment describes a split-type sealed piezoelectric-driven ultra-micro dispensing valve body. Figure 2 Enlarged view of point B in the middle; Figure 5 This embodiment describes a split-type sealed piezoelectric-driven ultra-micro dispensing valve body. Figure 2 Enlarged view of point C in the middle; Figure 6 This is a schematic diagram of the internal cavity of the connecting seat of a split-type sealed piezoelectric driven micro-dispensing valve body according to this embodiment.

[0019] In the diagram: 1. Piezoelectric module; 2. Valve body; 3. Dispensing head; 4. Glue storage chamber; 5. Sleeve; 6. Moving valve; 7. Glue inlet pipe; 8. Groove; 9. Connecting seat; 10. Vibrating metal plate; 11. Threaded hole; 12. Extension plate; 13. Limiting post; 14. Through hole; 15. Sealing ring; 16. Conical groove; 17. Annular trapezoidal groove; 18. Damping rod; 19. Through groove; 20. Arc groove; 21. Air inlet pipe; 22. Connecting pipe; 23. Air pump; 24. Elastic connecting ring; 25. Through hole; 26. Cavity; 27. Fixed seat; 28. Horizontal shaft; 29. ​​Torsion spring; 30. Arc trigger rod; 31. Cam; 32. Drive shaft; 33. Servo motor. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-6 This invention provides a technical solution: a split-type sealed piezoelectric-driven ultra-micro dispensing valve body, mainly composed of a piezoelectric module 1, a valve body 2, a detachable dispensing head 3, a connecting seat 9, a vibration drive assembly, a sealing damping assembly, and a pneumatic glue removal assembly. The overall structure adopts a split, modular, and detachable design, with each component independently assembled and replaceable for maintenance. The piezoelectric module 1 is detachably installed on the top of the valve body 2, and the piezoelectric probe at the bottom of the module 1 extends vertically into the internal cavity of the valve body 2. A groove 8 is formed at the bottom of the valve body 2, and a fixed connecting seat 9 is inserted into the groove 8. The connecting seat 9 is elastically connected to the dispensing head 3 through an elastic connecting ring 24, enabling micro-vibration adaptive adjustment of the dispensing head 3. The valve body 2 integrates a glue storage chamber 4, a sleeve 5, and a moving valve 6, and integrates a glue inlet tube 7 and pneumatic pipeline on the side. The overall structure is compact and has excellent sealing performance.

[0023] Several threaded holes 11 are opened at equal angles along the circumference of the top of the valve body 2. An extension plate 12 is welded to the side of the piezoelectric module 1. A limiting post 13 is welded to the side of the extension plate 12 facing the valve body 2. An assembly hole is provided between the limiting post 13 and the extension plate 12. The piezoelectric module 1 is accurately positioned and locked by bolts passing through the limiting post 13 and the threaded hole 11 of the valve body 2. The limiting post 13 can effectively limit the horizontal displacement of the piezoelectric module 1, ensure the verticality of the piezoelectric probe, and avoid sealing wear and dispensing accuracy deviation caused by transmission eccentricity.

[0024] A through hole 14 is provided at the center of the top of the valve body 2, allowing the piezoelectric probe to extend vertically into the glue storage chamber 4. A sealing ring 15 is fixedly installed on the top of the glue storage chamber 4, directly below the through hole 14, to achieve a radial full seal between the through hole 14 and the piezoelectric probe, preventing the glue inside the glue storage chamber 4 from leaking upwards. A conical groove 16 is provided inside the sealing ring 15, with the inner diameter of the conical groove 16 precisely matching the outer diameter of the piezoelectric probe, allowing the piezoelectric probe to slide through. The conical structure can adaptively conform to the outer wall of the probe, compensating for the slight eccentric gap caused by the high-frequency expansion and contraction of the probe.

[0025] Meanwhile, an annular trapezoidal groove 17 is formed inside the sealing ring 15 on the side of the conical groove 16. Several damping rods 18 are fixed at equal angles along the circumference inside the annular trapezoidal groove 17. The damping rods 18 are made of highly elastic silicone. When the piezoelectric probe vibrates at high frequency, the damping rods 18 can buffer and limit the radial micro-vibration of the probe, suppress the probe swing and offset, greatly reduce the friction and wear between the probe and the sealing ring 15, and improve the overall sealing stability, avoiding problems such as glue leakage and pressure loss during long-term operation.

[0026] A glue inlet pipe 7 is connected through the side of the glue storage chamber 4. The glue inlet pipe 7 is connected to an automated glue supply device to achieve quantitative and pressure-stabilized glue supply. A sleeve 5 is vertically fixed at the bottom of the glue storage chamber 4. The top of the sleeve 5 extends upward and into the interior of the glue storage chamber 4. Several through grooves 19 are evenly opened along the circumferential direction on the side wall of the sleeve 5. The through grooves 19 serve as glue flow channels. A movable valve 6 is slidably installed inside the sleeve 5. The top of the movable valve 6 is inclined and has an arc-shaped groove 20. A fixed magnet is embedded at the bottom of the arc-shaped groove 20. It is magnetically attracted and fixed to the bottom of the inserted piezoelectric probe to achieve gapless transmission.

[0027] In normal standby mode, the movable valve 6 blocks the through-slot 19 of the sleeve 5, blocking the flow of adhesive between the storage chamber 4 and the sleeve 5. During dispensing, the piezoelectric module 1 is powered on, and based on the inverse piezoelectric effect, it drives the piezoelectric probe to move downwards with slight displacement. The probe pushes the magnetically fixed movable valve 6 to slide downwards along the inner wall of the sleeve 5. The movable valve 6 disengages from the blocking position of the through-slot 19, and the adhesive inside the storage chamber 4 enters the sleeve 5 through the through-slot 19 on the side wall of the sleeve 5. It is then steadily guided downwards along the inclined slope at the top of the movable valve 6, achieving quantitative dispensing of adhesive. After dispensing, the piezoelectric probe is de-energized and resets, causing the movable valve 6 to move upwards and reset, re-blocking the through-slot 19, quickly cutting off the adhesive and preventing stringing and dripping.

[0028] The connecting seat 9 has a V-shaped high-elasticity connecting ring 24 fixedly assembled inside. The bottom of the elastic connecting ring 24 is fixedly connected to the top of the dispensing head 3. The V-shaped elastic structure provides a suspended elastic support for the dispensing head 3, providing elastic deformation space for the high-frequency micro-vibration of the dispensing head 3. Several inclined through holes 25 are evenly opened inside the elastic connecting ring 24. The through holes 25 are inclined towards the dispensing head 3. At the same time, a V-shaped groove structure is reserved inside the elastic connecting ring 24 to further improve the overall elasticity and resilience, meeting the deformation requirements of the high-speed micro-vibration of the dispensing head 3.

[0029] During the colloid conduction process, the adhesive slides through the sleeve 5 to the area of ​​the elastic connecting ring 24, and is precisely introduced into the dispensing head 3 through the inclined through hole 25. The inclined through hole 25 structure can avoid colloid accumulation, ensure smooth flow and uniform flow of colloid, and, together with piezoelectric micro-displacement control, realize nano-level ultra-micro precision dispensing.

[0030] The connecting seat 9 houses a vibration drive component, which consists of a cavity 26, a fixed seat 27, a horizontal shaft 28, a torsion spring 29, a vibrating metal plate 10, an arc-shaped trigger rod 30, a cam 31, a drive shaft 32, and a high-speed servo motor 33. Two sets of fixed seats 27 are symmetrically fixed inside the cavity 26, and a horizontal shaft 28 is fixed between the two sets of fixed seats 27. The vibrating metal plate 10 is rotatably sleeved on the outside of the horizontal shaft 28. A torsion spring 29 is sleeved on the outside of the horizontal shaft 28, with the vibrating metal plate 10 and the fixed seat 27 fixed at both ends of the torsion spring 29 respectively, enabling the vibrating metal plate 10 to return to its original position and spring back.

[0031] The inner wall of the vibrating metal plate 10 is in close contact with the side of the rubber head 3, and an arc-shaped trigger rod 30 is fixed on the outer side. The end of the arc-shaped trigger rod 30 contacts and engages with the outer wall of the cam 31. The drive shaft 32 is fixed to the axis of the cam 31. The drive shaft 32 is rotatably assembled inside the cavity 26, and its end extends out of the connecting seat 9 and connects to the high-speed servo motor 33. A hollow groove is opened at the top of the cavity 26 to avoid interference from the rotation of the cam 31 and ensure smooth movement.

[0032] A miniature air pump 23 is fixed to the side of the valve body 2 with screws. A connecting pipe 22 is installed inside the groove 8 of the valve body 2. One end of the connecting pipe 22 is inserted into the air inlet pipe 21 on the side of the connecting seat 9, and the other end extends along the side wall of the valve body 2 and connects to the air pump 23 to realize the introduction of high-pressure airflow. The servo motor 33 and the air pump 23 are controlled in series. After the dispensing operation is completed, the air pump 23 and the servo motor 33 are started synchronously: the servo motor 33 drives the cam 31 to rotate at high speed. The cam 31 repeatedly pushes the arc-shaped trigger rod 30, which drives the vibrating metal plate 10 to swing back and forth at high frequency around the horizontal axis 28. With the help of the torsion spring 29, it quickly resets, realizing the high-frequency vibration of the vibrating metal plate 10, which in turn drives the dispensing head 3 to vibrate slightly. At the same time, the air pump 23 outputs high-pressure airflow, which is introduced into the interior of the connecting seat 9 through the connecting pipe 22 and the air inlet pipe 21. The high-pressure airflow, together with the high-frequency vibration of the dispensing head 3, quickly blows away and removes the residual glue inside the dispensing head 3, completely solving the problem of residual glue solidification and blockage.

[0033] This device adopts a fully modular design. The piezoelectric module 1 can be quickly disassembled and assembled via limiting posts 13 and bolts, and can be disassembled, maintained, and replaced independently. The dispensing head 3 is connected via a connector 9 and elastically fixed by a flexible connecting ring 24, and can be directly plugged in and replaced without disassembling the valve body 2. The air pump 23 and servo motor 33 are both externally screwed, making maintenance and replacement convenient. Each module works independently and does not interfere with each other, greatly reducing the difficulty and cost of equipment maintenance.

[0034] In this embodiment, the sealing ring 15 of the glue storage cavity 4 is made of perfluororubber FFKM (model: Kalrez 4079). This material has ultra-high corrosion resistance, high and low temperature resistance (-20℃~260℃), ultra-low coefficient of friction, and high sealing performance. It is suitable for long-term immersion in media such as glue and solvents, can resist high-frequency extension and retraction wear of piezoelectric probes, and has no residual precipitation. It meets the clean production requirements of semiconductors and precision electronics, and is compatible with the integrated processing structure of the conical groove 16 and the annular trapezoidal groove 17.

[0035] The V-shaped elastic connecting ring 24 is made of high-elasticity polyurethane modified silicone rubber (PU-Si 90A), a patented high-elasticity special material with high resilience, fatigue resistance, and aging resistance. It can be adapted to the high-frequency micro-vibration conditions of the dispensing head 3 for a long time. The material hardness is 90A, which takes into account both structural support and elastic deformation capability. It can stably maintain the V-shaped groove structure. The inclined through hole 25 has good formability, smooth flow of adhesive, and is not easy to clog. At the same time, it has good wear resistance and adhesive corrosion resistance.

[0036] Piezoelectric Module 1 (including piezoelectric probe): The core adopts a PZT-5H stacked piezoelectric actuator (model: PST150 / 5×5 / 20), with a driving voltage of 0~150V, a maximum displacement of 20μm, a response time of ≤0.1ms, and an operating frequency of 0~500Hz, meeting the requirements of ultra-micro volume high-frequency precision dispensing; it is equipped with an integrated tungsten steel piezoelectric probe with a diameter of 1.0mm, a hardness of HRC62, wear-resistant and deformation-resistant, and suitable for long-term high-frequency expansion and contraction conditions.

[0037] The adhesive removal air pump 23 uses a miniature silent diaphragm air pump 23 (model: DC24V-AP2001), with a rated voltage of DC24V, a rated air pressure of 0.2~0.4MPa, adjustable air pressure, small size, and can be fixed and installed with screws on the side of the valve body. It has stable airflow and can be used with a vibration structure to quickly remove residual adhesive.

[0038] The servo motor 33 is a high-speed micro servo motor 33 (model: SG90S high-speed version), with a rated voltage of DC24V, a maximum speed of 12000r / min, a no-load response speed of 0.05s, and supports pulse precision speed regulation. It can drive the cam 31 to reciprocate at high speed, realizing the high-frequency oscillation of the vibrating metal plate 10. The motor supports series linkage control with the air pump 23, synchronous start and stop, and is suitable for automated glue removal processes.

[0039] Drive shaft 32 and cam 31 matching components: Cam 31 is made of POM wear-resistant engineering plastic material, and drive shaft 32 is made of stainless steel 304 precision optical shaft, which is suitable for high-frequency rotation without jamming and low wear.

[0040] The specific workflow of this invention is as follows: In the initial standby state, the piezoelectric module 1 is de-energized, the piezoelectric probe has no displacement output, and the moving valve 6 is held in the upper limit position by its own structure and magnetic attraction with the piezoelectric probe, completely sealing the circumferential groove 19 on the side wall of the sleeve 5, blocking the glue flow channel between the glue storage chamber 4, the sleeve 5, and the dispensing head 3. The glue storage chamber 4 is pre-pressurized and stored through the glue inlet pipe 7. The conical self-adaptive sealing structure of the sealing ring 15 and the damping rod 18 work together to completely seal the gap through which the piezoelectric probe passes, preventing glue seepage, pressure loss, and glue leakage. The equipment is in a sealed standby state.

[0041] The automated control system outputs a dispensing electrical signal, energizing the piezoelectric module 1. Based on the inverse piezoelectric effect, it rapidly generates a downward micro-displacement at the micrometer level, with a response time ≤0.1ms. The piezoelectric probe extends and retracts downward, driving the moving valve 6 to slide synchronously down the inner wall of the sleeve 5 via a magnetic attraction structure. The moving valve 6 disengages from the sealing position of the through groove 19 in the sleeve 5, and the pressure-stabilized adhesive inside the adhesive storage chamber 4 enters the sleeve 5 evenly through the circumferential through groove 19. The adhesive flows smoothly along the inclined slope at the top of the moving valve 6, and is directed into the dispensing head 3 through the inclined through hole 25 of the V-shaped elastic connecting ring 24 inside the connecting seat 9. Finally, it is extruded from the bottom of the dispensing head 3, completing the nano-level ultra-micro precision dispensing. The entire dispensing process features stable flow and no adhesive accumulation. Combined with precise piezoelectric displacement control, the dispensing volume can be precisely controlled, making it suitable for ultra-fine dispensing applications.

[0042] After a single-point dispensing operation is completed, the control system cuts off the power supply to the piezoelectric module 1. The piezoelectric probe instantly resets and retracts, causing the magnetically attached moving valve 6 to quickly move upward and reset, completely resealing the through groove 19 of the sleeve 5, instantly cutting off the adhesive flow path and achieving rapid adhesive cut-off. This structure effectively avoids problems such as adhesive stringing, workpiece surface trailing, and residual adhesive dripping caused by the delayed adhesive cut-off of traditional dispensing valves, ensuring neat dispensing and forming.

[0043] After the glue disconnection and reset are completed, the control system synchronously starts the servo motor 33 and the micro air pump 23, which are linked in series, and enters the automatic glue cleaning process. The high-speed servo motor 33 drives the cam 31 to rotate at high speed. The cam 31 continuously pushes the arc-shaped trigger rod 30, causing the vibrating metal plate 10 to swing back and forth at high frequency around the horizontal axis 28. With the elastic reset action of the torsion spring 29, continuous micro-vibration is achieved. The vibrating metal plate 10 continuously abuts against the side wall of the dispensing head 3, causing the dispensing head 3 to vibrate at high frequency as a whole. At the same time, the air pump 23 outputs a stable high-pressure airflow, which is introduced into the interior of the connecting seat 9 through the connecting pipe 22 and the air inlet pipe 21. The high-pressure airflow passes through the through hole 25 of the elastic connecting ring 24 and the glue outlet channel of the dispensing head 3. With the high-frequency vibration of the dispensing head 3, the residual glue attached to the inner wall of the glue outlet channel is quickly shaken off and blown away, thoroughly removing the dead corners of residual glue. After the glue cleaning is completed, the servo motor 33 and the air pump 23 stop synchronously, and the equipment returns to the standby sealed state, waiting for the next glue dispensing command, completing one complete work cycle.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split type sealed piezoelectric driving ultramicro dispensing valve body, characterized in that, The device includes a piezoelectric module (1), a valve body (2), and a dispensing head (3) detachably mounted on the bottom of the valve body (2). The piezoelectric module (1) is detachably connected to the valve body (2). The piezoelectric probe of the piezoelectric module (1) extends into the valve body (2). The valve body (2) has a glue storage cavity (4) inside. A sleeve (5) is fixed at the bottom of the glue storage cavity (4). A movable valve (6) is slidably connected inside the sleeve (5). The top of the movable valve (6) is connected to the bottom of the inserted piezoelectric probe. The glue storage chamber (4) is connected to the glue inlet pipe (7) on the side. The glue inlet pipe (7) is connected to the glue supply device at the end away from the valve body (2). The bottom of the valve body (2) is provided with a groove (8). A connecting seat (9) is inserted into the groove (8). The connecting seat (9) is elastically connected to the dispensing head (3). The connecting seat (9) is also provided with a vibration drive component. The vibration drive component includes a vibrating metal plate (10). The vibrating metal plate (10) abuts against the side of the dispensing head (3).

2. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 1, characterized in that, The valve body (2) is provided with a threaded hole (11) at the top. The threaded hole (11) is provided at several angles along the circumferential direction of the valve body (2). An extension plate (12) is welded to the side of the piezoelectric module (1). A limit post (13) is welded to the side of the extension plate (12) facing the valve body (2). The limit post (13) is connected to the extension plate (12) through the interior.

3. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 1, characterized in that, The valve body (2) has a through hole (14) at the top for the piezoelectric probe to be inserted, and a sealing ring (15) is fixed at the top of the glue storage cavity (4). The sealing ring (15) is located below the through hole (14), and the top of the sealing ring (15) is fixed to the top wall of the glue storage cavity (4).

4. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 3, characterized in that, The sealing ring (15) has a conical groove (16) inside, through which a piezoelectric probe passes. An annular trapezoidal groove (17) is provided on the side of the conical groove (16), and a damping rod (18) is fixed inside the annular trapezoidal groove (17). Several damping rods (18) are provided at equal angles along the circumference of the annular trapezoidal groove (17).

5. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 1, characterized in that, The top of the sleeve (5) extends into the glue storage cavity (4), and the side of the sleeve (5) is provided with a through groove (19), which is provided in several directions along the circumference of the sleeve (5).

6. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 1, characterized in that, The movable valve (6) is inclined near its top. The top of the movable valve (6) is provided with an arc groove (20). A magnet is embedded at the bottom of the arc groove (20). The magnet is attracted and fixed to the piezoelectric probe.

7. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 1, characterized in that, The top of the connector (9) is inserted into the outside of the sleeve (5). An air inlet pipe (21) is fixedly inserted into the side of the connector (9). A connector (22) is provided inside the groove (8). The end of the connector (22) inside the groove (8) is connected to the air inlet pipe (21). The end of the connector (22) away from the air inlet pipe (21) extends along the side of the valve body (2). An air pump (23) is connected to the extended end of the connector (22). The air pump (23) is screwed and fixed to the side of the valve body (2).

8. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 1, characterized in that, The connecting seat (9) has an elastic connecting ring (24) fixed inside. The elastic connecting ring (24) has a V-shaped cross section. The bottom of the elastic connecting ring (24) is fixedly connected to the dispensing head (3). The elastic connecting ring (24) has several through holes (25) inside. The through holes (25) are inclined towards the dispensing head (3).

9. The split-type sealed piezoelectric-driven ultra-micro dispensing valve body (2) according to claim 7, characterized in that, The vibration drive also includes a cavity (26) disposed inside the connecting seat (9). A fixing seat (27) is fixed inside the cavity (26). The fixing seats (27) are symmetrically arranged. A horizontal shaft (28) is fixed between the two fixing seats (27). The vibrating metal plate (10) is rotatably connected to the outside of the horizontal shaft (28). A torsion spring (29) is sleeved on the outside of the horizontal shaft (28). One end of the torsion spring (29) is fixed to the side of the vibrating metal plate (10), and the other end is fixed to the side of the fixing seat (27). The vibrating metal plate (10) is away from the dispensing head (3). An arc-shaped trigger rod (30) is fixed at one end. A cam (31) is provided inside the arc-shaped trigger rod (30). The cam (31) is rotatably connected inside the cavity (26). A drive shaft (32) is fixed at the center of the cam (31). The drive shaft (32) is rotatably connected inside the cavity (26). A servo motor (33) is connected to the end of the drive shaft (32) that extends out of the connecting seat (9). The servo motor (33) is connected in series with the air pump (23). A hollow groove is also provided at the top of the cavity (26). The hollow groove is used to avoid interfering with the rotation of the cam (31).

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