Piezoelectric ceramic jet dispensing system

Abstract

The application discloses a piezoelectric ceramic jet glue dispensing system, which is characterized in that a heat conducting sleeve is arranged on the outside of the glue feeding body and the glue supply cylinder, the heat conducting sleeve on the outside of the glue feeding body is arranged on the outside of the region where the glue feeding runner and the glue discharging runner are arranged, one end of the glue feeding body opposite to the heat conducting sleeve is connected with the lower end surface of the valve body through a mounting block, a mounting groove for embedding the glue feeding body is arranged on the side surface of the mounting block, a plurality of grooves are arranged on the upper surface of the mounting block towards the valve body, a heat insulation block is embedded in each groove, and the upper end surface of the heat insulation block is higher than the upper surface of the mounting block and is used for being in contact with the lower end surface of the valve body towards the mounting block. On the basis of guaranteeing the glue fluidity and the glue discharging precision, the glue feeding body, the striker and the nozzle can be rotatably disassembled without interfering with the component structure in the valve body, and the interference of temperature change on the piezoelectric column in the valve body can be avoided to influence the glue discharging performance.

Description

Technical Field

[0001] This invention relates to the field of dispensing technology, and in particular to a piezoelectric ceramic jet dispensing system. Background Technology

[0002] Dispensing is characterized by low cost, high efficiency, and suitability for mass production, and its application in the packaging and electronic product assembly industries is already widespread. Traditional needle-type piezoelectric jet dispensing valves use a piezoelectric stack as the driving power source. An amplification mechanism amplifies the displacement of the piezoelectric stack, thereby driving the needle to strike the nozzle, achieving adhesive dispensing through the resulting pressure difference. Due to the high dispensing accuracy and efficiency of piezoelectric jet dispensing valves, and their ability to dispense high-viscosity adhesives, they have been widely researched and applied in the electronic packaging field. Because of the inherent properties of adhesives (such as hot melt adhesives), some adhesives require heating or cooling before dispensing. The piezoelectric ceramics inside the jet valve are temperature-sensitive, and the heating or cooling temperatures applied to the adhesive can adversely affect the jet valve. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a piezoelectric ceramic jet dispensing system. This piezoelectric ceramic jet dispensing system, while ensuring the fluidity of the adhesive and the accuracy of dispensing, allows for the rotation and disassembly of the glue inlet body, the ejector pin and the nozzle without interfering with the internal component structure of the valve body. It also avoids the interference of temperature changes on the piezoelectric column inside the valve body, which would affect the dispensing performance.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a piezoelectric ceramic jet dispensing system, comprising: a glue supply cylinder, a valve body with an internal receiving groove, a glue inlet body with a glue inlet channel and a glue outlet channel respectively opened inside, a nozzle installed on the glue inlet body, and a striker configured to cooperate with the nozzle. The glue outlet at the lower end of the glue supply cylinder is connected to the end of the glue inlet channel on the glue inlet body away from the glue outlet channel through a connecting pipe. The lower end of the glue outlet channel, which is connected to the end of the glue inlet channel away from the glue supply cylinder at its upper end, is connected to the nozzle. An installation hole is opened on the upper surface of the glue inlet body and directly above the glue outlet channel. The lower end of a guide sleeve through which the striker can pass is threaded into this installation hole. The upper end of the guide sleeve passes through the receiving groove of the valve body from the lower end opening. The upper part of the striker installed in the guide sleeve is located in the receiving groove. The lower end of the striker passes through the glue outlet channel of the glue inlet body and cooperates with the nozzle. Both the glue inlet body and the glue supply cylinder are provided with a heat-conducting sleeve on their outer sides. Each heat-conducting sleeve is embedded with at least one heating or cooling element. The heat-conducting sleeve on the outer side of the glue inlet body is located on the outer side of the area where the glue inlet channel and the glue outlet channel are opened. The end of the glue inlet body opposite to the heat-conducting sleeve is connected to the lower end face of the valve body through a mounting block. A mounting groove for embedding the glue inlet body is opened on the side surface of the mounting block. Several grooves are spaced apart on the upper surface of the mounting block facing the valve body. A heat insulation block is embedded in each groove. The upper end face of the heat insulation block is higher than the upper surface of the mounting block and is used to contact the lower end face of the valve body facing the mounting block. A horizontally extending mounting hole is formed on the side surface of the mounting block, above or below the glue injection body. A pin is rotatably mounted in the mounting hole. A guide hole communicating with the mounting hole is formed on the side wall of the mounting groove facing the glue injection body. A limiting ball that can slide vertically between the pin and the glue injection body is provided in the vertically extending guide hole. A first groove corresponding to the limiting ball is formed on the side surface of the glue injection body. A second groove corresponding to the limiting ball is formed on the outer surface of the pin. When the limiting ball is located outside the second groove, the limiting ball embedded in the first groove is in abutting contact with the pin.

[0005] The following are further improvements to the above technical solution: 1. In the above scheme, the valve body's receiving groove is provided with a first lever, a piezoelectric column, and a second lever sequentially from top to bottom. The right end of the first lever is rotatably connected to the inner wall of the receiving groove above it via a first protrusion and a first groove that cooperate with each other. The right end of the second lever is rotatably connected to the inner wall of the receiving groove below it via a second protrusion and a second groove that cooperate with each other. The upper end of the piezoelectric column is rotatably in contact with the first lever via a third protrusion and a third groove that cooperate with each other. The lower end of the piezoelectric column is rotatably in contact with the second lever via a fourth protrusion and a fourth groove that cooperate with each other. The third protrusion and the third groove are located near the right end of the first lever and... Located to the left of the first protrusion and the first groove, the fourth protrusion and the fourth groove are located near the right end of the second lever and to the left of the second protrusion and the second groove. A support column is provided in the receiving groove of the valve body and below the left end of the first lever. A first spring is provided between the support column and the lower surface of the left end of the first lever. The lower end of a rotary screw installed on the valve body contacts the upper surface of the left end of the first lever. A second spring is provided between the lower surface of the second lever and the inner wall of the bottom of the receiving groove. The lower surface of the left end of the second lever contacts the upper end face of the striker. A return spring is provided between the lower end face of the radially outward flange of the upper end of the striker and the guide sleeve.

[0006] 2. In the above scheme, the second spring that is in contact with the lower surface of the left end of the second lever is fitted on the outside of the return spring and the guide sleeve and is coaxially arranged with the return spring.

[0007] 3. In the above scheme, a horizontal groove and a vertical groove located above the horizontal groove are respectively provided on the outer side of the valve body and the upper part of the rotary screw, thereby forming a first clamping part and a second clamping part around the rotary screw, and the first clamping part and the second clamping part are connected by a fastening bolt.

[0008] 4. In the above scheme, the mounting block has an extension extending in the direction of the guide sleeve, and a limiting through hole is provided on the extension for the guide sleeve to pass through.

[0009] 5. In the above scheme, the other end of the pin, which is embedded in the mounting hole, has a wrench portion located on the outside of the mounting block.

[0010] 6. In the above scheme, an air inlet pressurization component is provided at the upper end of the glue supply cylinder.

[0011] 7. In the above scheme, a protective shell is provided on the outside of the heat-conducting sleeve fitted on the outside of the glue supply cylinder.

[0012] 8. In the above scheme, the glue inlet body and the glue outlet channel have a sealing ring fitted on the outside of the firing pin.

[0013] 9. In the above solution, the lower surface of the glue injection body has a mounting protrusion, and the nozzle is mounted on the lower end face of the mounting protrusion through a mounting seat. The mounting seat with internal threads and the mounting protrusion with external threads are connected by threads.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. The piezoelectric ceramic jet dispensing system of the present invention has a heat-conducting sleeve on the outer side of both the glue inlet body and the glue supply cylinder. At least one heating or cooling element is embedded in each heat-conducting sleeve. The heat-conducting sleeve on the outer side of the glue inlet body is located on the outer side of the area where the glue inlet channel and the glue outlet channel are located. One end of the glue inlet body opposite to the heat-conducting sleeve is connected to the lower end face of the valve body via a mounting block. A mounting groove for embedding the glue inlet body is formed on the side surface of the mounting block. Several grooves are spaced apart on the upper surface of the mounting block facing the valve body. A heat-insulating block is embedded in each groove. The upper end face is higher than the upper surface of the mounting block and is used to contact the lower end face of the valve body facing the mounting block. While adjusting the temperature of the adhesive from the glue bucket to the dispensing channel through heating or cooling to ensure dispensing accuracy and quality, it can isolate heat transfer between the glue inlet body and the valve body, preventing temperature changes from interfering with the piezoelectric column inside the valve body and affecting dispensing performance. Furthermore, a mounting hole is opened on the upper surface of the glue inlet body, directly above the dispensing channel. The lower end of a guide sleeve through which the firing pin passes is threaded into this mounting hole. The upper end of the guide sleeve extends from the valve body... The lower end of the valve body is inserted into the receiving groove of the valve body. The upper part of the firing pin, which is installed in the guide sleeve, is located in the receiving groove. The lower end of the firing pin is inserted into the dispensing channel of the dispensing body and cooperates with the nozzle. A horizontally extending mounting hole is opened on the side surface of the mounting block, above or below the dispensing body. A pin is rotatably installed in the mounting hole. A guide hole communicating with the mounting hole is opened on the side wall of the mounting groove facing the dispensing body. A limiting ball that can slide vertically between the pin and the dispensing body is provided in the vertically extending guide hole. A limiting ball is opened on the side surface of the dispensing body. There is a first groove corresponding to the limiting ball, and a second groove corresponding to the limiting ball is opened on the outer surface of the pin. When the limiting ball is located outside the second groove, the limiting ball embedded in the first groove is in abutting contact with the pin, realizing a quick-release design between the glue injection module and the valve body. This not only enables stable installation of the glue injection body with internal flow channels, but also allows for rotational disassembly and assembly of the glue injection body, the impact pin, and the nozzle without interfering with the internal component structure of the valve body. It also avoids damage to the impact pin and facilitates high-frequency cleaning of the disassembled glue injection body, impact pin, and nozzle.

[0015] 2. In the piezoelectric ceramic jet dispensing system of the present invention, a second spring is provided between the lower surface of the second lever and the inner wall of the bottom of the receiving groove. The lower surface of the left end of the second lever contacts the upper end face of the ejector pin. A return spring is provided between the lower end face of the radially outward flange of the upper end of the ejector pin and the guide sleeve. The second spring, which is in contact with the lower surface of the left end of the second lever, is fitted on the outside of the return spring and the guide sleeve and is coaxially arranged with the return spring. This can improve the stability of the second lever and the ejector pin that moves with the second lever during repeated high-frequency movement, as well as the consistency of the dispensing gap formed between the ejector pin and the nozzle and the impact force between them, thereby improving... The precision of glue dispensing and its stability during long-term use are also important. Furthermore, the lower end of the rotary screw mounted on the valve body contacts the upper surface of the left end of the first lever. A horizontal groove and a vertical groove located above the horizontal groove are respectively provided on the outer side of the upper part of the rotary screw on the valve body, thereby forming a first clamping part and a second clamping part around the rotary screw. The first clamping part and the second clamping part are connected by a fastening bolt. The distance between the impact pin and the nozzle can be adjusted by rotating the rotary screw, and the rotary screw can be locked after adjustment to avoid inconsistent glue dispensing caused by the movement of the rotary screw during glue dispensing. Attached Figure Description

[0016] Appendix Figure 1 This is a front view of the piezoelectric ceramic jet dispensing system of the present invention; Appendix Figure 2 This is a cross-sectional front view of the piezoelectric ceramic jet dispensing system of the present invention; Appendix Figure 3 This is a magnified view of a partial structure of the spray dispensing system of the present invention from a three-dimensional perspective; Appendix Figure 4 This is a partial structural cross-sectional view of the jet dispensing system of the present invention from a three-dimensional perspective; Appendix Figure 5 A partial structural cross-section of the jet dispensing system of the present invention. Figure 1 ; Appendix Figure 6 A partial structural cross-section of the jet dispensing system of the present invention. Figure 2 ; Appendix Figure 7 A partial structural cross-section of the jet dispensing system of the present invention. Figure 3 ; Appendix Figure 8 A partial structural cross-section of the jet dispensing system of the present invention. Figure 4 .

[0017] In the above attached figures: 1. Inlet body; 2. Nozzle; 3. Impact pin; 301. Flange; 41. Inlet channel; 42. Outlet channel; 51. Mounting protrusion; 52. Mounting base; 6. Heat-conducting sleeve; 61. Heating or cooling element; 7. Mounting block; 71. Mounting groove; 72. Extension; 73. Limiting through hole; 81. Groove; 82. Heat insulation block; 9. Pin; 91. Wrench part; 10. Mounting hole; 11. Guide hole; 12. Limiting ball; 131. First groove; 132. Second groove; 14. Guide sleeve; 15. Return spring; 16. Mounting hole; 17. Sealing ring; 21. Receiving groove; 22. 221. Valve body; 222. Horizontal groove; 223. Vertical groove; 24. First lever; 25. First protrusion; 26. First groove; 271. Piezoelectric column; 28. Third protrusion; 291. Third groove; 20. Fourth groove; 21. Second lever; 222. Second protrusion; 233. Second groove; 244. Second groove; 25. Second lever; 26. Second protrusion; 272. Second groove; 28. Support column; 291. First spring; 292. Second spring; 30. Adjusting screw; 31. First clamping part; 32. Second clamping part; 33. Fastening bolt; 34. Glue supply cylinder; 35. Connecting pipe; 36. Air inlet pressurization assembly; 37. Protective shell. Detailed Implementation

[0018] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0019] Example 1: A piezoelectric ceramic jet dispensing system includes: a glue supply cylinder 31, a valve body 22 with an internal receiving groove 21, a glue inlet body 1 with a glue inlet channel 41 and a glue outlet channel 42 respectively opened inside, a nozzle 2 installed on the glue inlet body 1, and a striking pin 3 that cooperates with the nozzle 2. The glue outlet at the lower end of the glue supply cylinder 31 is connected to the end of the glue inlet channel 41 on the glue inlet body 1 away from the glue outlet channel 42 through a connecting pipe 32. The glue outlet channel 42 is connected at the upper end of the glue inlet channel 41 away from the glue supply cylinder 31. The lower end is connected to the nozzle 2. An installation hole 16 is opened on the upper surface of the glue injection body 1 and directly above the glue outlet channel 42. The lower end of a guide sleeve 14 through which the impact pin 3 can pass is threaded into the installation hole 16. The upper end of the guide sleeve 14 passes through the lower opening of the valve body 22 into the receiving groove 21 of the valve body 22. The upper part of the impact pin 3 installed in the guide sleeve 14 is located in the receiving groove 21. The lower end of the impact pin 3 passes into the glue outlet channel 42 of the glue injection body 1 and cooperates with the nozzle 2. A heat-conducting sleeve 6 is provided on the outer side of both the glue inlet body 1 and the glue supply cylinder 31. At least one heating or cooling element 61 is embedded in each heat-conducting sleeve 6. The heat-conducting sleeve 6 on the outer side of the glue inlet body 1 is located on the outer side of the area where the glue inlet channel 41 and the glue outlet channel 42 are opened. The end of the glue inlet body 1 opposite to the heat-conducting sleeve 6 is connected to the lower end face of the valve body 22 through a mounting block 7. A mounting groove 71 for the glue inlet body 1 to be embedded is opened on the side surface of the mounting block 7. Several grooves 81 are spaced apart on the upper surface of the mounting block 7 facing the valve body 22. A heat insulation block 82 is embedded in each groove 81. The upper end face of the heat insulation block 82 is higher than the upper surface of the mounting block 7 and is used to contact the lower end face of the valve body 22 facing the mounting block 7. A horizontally extending mounting hole 10 is formed on the side surface of the mounting block 7, above or below the glue injection body 1. A pin 9 is rotatably mounted in the mounting hole 10. A guide hole 11 communicating with the mounting hole 10 is formed on the side wall of the mounting groove 71 facing the glue injection body 1. A limiting ball 12 that can slide vertically between the pin 9 and the glue injection body 1 is provided in the vertically extending guide hole 11. A first groove 131 corresponding to the limiting ball 12 is formed on the side surface of the glue injection body 1. A second groove 132 corresponding to the limiting ball 12 is formed on the outer surface of the pin 9. When the limiting ball 12 is located outside the second groove 132, it is embedded in the first groove 131. The limiting ball 12 is in contact with the pin 9. When it is necessary to disassemble the glue injection body 1, firstly, the pin 9 is rotated to the second position by the wrench part 91. At this time, the second groove 132 on the pin 9 faces the limiting ball 12. Then, the glue injection body 1 is rotated around the ejector pin 3 in the glue outlet channel 42 until the glue injection body 1 is rotated out of the mounting groove 71 of the mounting block 7. During this process, the limiting ball 12 moves into the second groove 132 on the pin 9 under the push of the body, thereby losing the limiting of the glue injection body 1 and allowing the glue injection body 1 to rotate. Then, the glue injection body 1 that has been rotated out of the mounting groove 71 is moved downward until the disassembly is completed. The guide sleeve 14, ejector pin 3 and nozzle 2 installed on the glue injection body 1 are also removed together for easy replacement and cleaning.

[0020] The valve body 22 has a first lever 23, a piezoelectric column 24, and a second lever 25 arranged sequentially from top to bottom within its receiving groove 21. The right end of the first lever 23 is rotatably connected to the inner wall of the receiving groove 21 above it via a first protrusion 231 and a first groove 232. The right end of the second lever 25 is rotatably connected to the inner wall of the receiving groove 21 below it via a second protrusion 251 and a second groove 252. The upper end of the piezoelectric column 24 is rotatably in contact with the first lever 23 via a third protrusion 241 and a third groove 242. The lower end of the piezoelectric column 24 is connected to... The second levers 25 are in rotatable contact through the cooperating fourth protrusion 243 and fourth groove 244. The third protrusion 241 and third groove 242 are located near the right end of the first lever 23 and to the left of the first protrusion 231 and first groove 232. The fourth protrusion 243 and fourth groove 244 are located near the right end of the second levers 25 and to the left of the second protrusion 251 and second groove 252. A support column 26 is provided in the receiving groove 21 of the valve body 22 and below the left end of the first lever 23. A first spring 271 is provided between the support column 26 and the lower surface of the left end of the first lever 23. The lower end of the rotary screw 28 mounted on the valve body 22 contacts the upper surface of the left end of the first lever 23. A second spring 272 is provided between the lower surface of the second lever 25 and the inner wall of the bottom of the receiving groove 21. The lower surface of the left end of the second lever 25 contacts the upper end face of the striker 3. A return spring 15 is provided between the lower end face of the radially outward flange 301 of the upper end of the striker 3 and the guide sleeve 14. The glue in the glue supply cylinder 31 enters the glue inlet channel 41 on the glue inlet body 1 through the connecting pipe 32 and then enters the glue outlet channel 42. The lower end of the striker 3, which cooperates with the nozzle 2, penetrates into the glue outlet channel 42 and passes through the nozzle 2. The repeated impacts between the nozzles 2 cause the glue in the glue dispensing channel 42 to be sprayed outward from the lower end of the nozzle 2 for dispensing operation. Specifically: after the piezoelectric column 24 is energized, it expands downward to form a thrust on the right end of the second lever 25, causing the left end of the second lever 25, which rotates around the second protrusion, to push the ejector pin 3 downward to strike the nozzle 2 and dispense glue; after the piezoelectric column 24 is de-energized, it retracts, and the nested reset spring 15 and the second spring 272 reset respectively, so that the ejector pin 3 and the second lever 25 return to their initial positions; the excitation voltage of the piezoelectric column 24 is a square wave, therefore, the ejector pin performs high-speed reciprocating motion under the action of the piezoelectric column 24, so that the glue can be continuously sprayed out from the nozzle 2.

[0021] The surface of the aforementioned adjusting screw 28 that contacts the upper surface of the left end of the first lever 23 is a spherical surface. The surfaces of the first protrusion 231 and the first groove 232, the second protrusion 251 and the second groove 252, the third protrusion 241 and the third groove 242, and the fourth protrusion 243 and the fourth groove 244 that cooperate with each other are all arc surfaces. The first protrusion 231 is formed on the upper surface of the right end of the first lever 23. The first groove 232 into which the first protrusion 231 is embedded is opened on the inner wall of the receiving groove 21. The second groove 252 is opened on the lower surface of the right end of the second lever 25. The second protrusion 251 is disposed on the inner wall of the receiving groove 21. The third protrusion 241 is disposed on the upper end of the piezoelectric column 24. The third groove 242 is opened on the lower surface of the first lever 23. The fourth protrusion 243 is integrally formed on the upper surface of the second lever 25. The fourth groove 244 is opened on the lower end surface of the piezoelectric column 24.

[0022] The second spring 272, which is in contact with the lower surface of the left end of the second lever 25, is fitted on the outside of the return spring 15 and the guide sleeve 14 and is coaxially arranged with the return spring 15. The return spring 15 of the striker promotes the striker to quickly return to the raised state, so that a gap is formed between the striker and the nozzle, which facilitates the rapid entry of fluid. The return spring of the second lever (i.e., the second spring 272) promotes the lever to quickly rebound after the piezoelectric ceramic shortens, which protects the piezoelectric ceramic and facilitates the rapid lifting of the striker. A horizontal groove 221 and a vertical groove 222 located above the horizontal groove 221 are respectively provided on the valve body 22 and on the outer side of the upper part of the rotary screw 28, thereby forming a first clamping part 291 and a second clamping part 292 around the rotary screw 28, respectively. The first clamping part 291 and the second clamping part 292 are connected by a fastening bolt 30.

[0023] The mounting block 7 has an extension 72 extending in the direction of the guide sleeve 14, and a limiting through hole 73 is provided on the extension 72 for the guide sleeve 14 to pass through.

[0024] Example 2: A piezoelectric ceramic jet dispensing system, comprising: a glue supply cylinder 31, a valve body 22 with an internal receiving groove 21, a glue inlet body 1 with a glue inlet channel 41 and a glue outlet channel 42 respectively opened inside, a nozzle 2 mounted on the glue inlet body 1, and a striking pin 3 that cooperates with the nozzle 2. The glue outlet at the lower end of the glue supply cylinder 31 is connected to the end of the glue inlet channel 41 on the glue inlet body 1 away from the glue outlet channel 42 through a connecting pipe 32. The glue outlet channel 42 is connected at the upper end of the glue outlet channel 41 away from the glue supply cylinder 31. The lower end is connected to the nozzle 2. An installation hole 16 is opened on the upper surface of the glue injection body 1 and directly above the glue outlet channel 42. The lower end of a guide sleeve 14 through which the impact pin 3 can pass is threaded into the installation hole 16. The upper end of the guide sleeve 14 passes through the lower opening of the valve body 22 into the receiving groove 21 of the valve body 22. The upper part of the impact pin 3 installed in the guide sleeve 14 is located in the receiving groove 21. The lower end of the impact pin 3 passes into the glue outlet channel 42 of the glue injection body 1 and cooperates with the nozzle 2. A heat-conducting sleeve 6 is provided on the outer side of both the glue inlet body 1 and the glue supply cylinder 31. At least one heating or cooling element 61 is embedded in each heat-conducting sleeve 6. The heat-conducting sleeve 6 on the outer side of the glue inlet body 1 is located on the outer side of the area where the glue inlet channel 41 and the glue outlet channel 42 are opened. The end of the glue inlet body 1 opposite to the heat-conducting sleeve 6 is connected to the lower end face of the valve body 22 through a mounting block 7. A mounting groove 71 for the glue inlet body 1 to be embedded is opened on the side surface of the mounting block 7. Several grooves 81 are spaced apart on the upper surface of the mounting block 7 facing the valve body 22. A heat insulation block 82 is embedded in each groove 81. The upper end face of the heat insulation block 82 is higher than the upper surface of the mounting block 7 and is used to contact the lower end face of the valve body 22 facing the mounting block 7. A horizontally extending mounting hole 10 is provided on the side surface of the mounting block 7, above or below the glue injection body 1. A pin 9 is rotatably installed in the mounting hole 10. A guide hole 11 communicating with the mounting hole 10 is provided on the side wall of the mounting groove 71 facing the glue injection body 1. A limiting ball 12 that can slide vertically between the pin 9 and the glue injection body 1 is provided in the vertically extending guide hole 11. A first groove 131 corresponding to the limiting ball 12 is provided on the side surface of the glue injection body 1. A second groove 132 corresponding to the limiting ball 12 is provided on the outer surface of the pin 9. When the limiting ball 12 is located outside the second groove 132, the limiting ball 12 embedded in the first groove 131 is in abutting contact with the pin 9.

[0025] The other end of the pin 9, which is embedded in the mounting hole 10, has a wrench portion 91 located on the outside of the mounting block 7; the mounting block 7 is mounted on the lower end face of the valve body 22 by at least two bolts; the first groove 131 is a quarter-spherical groove, and the second groove 132 is an arc-shaped groove opened on the circumference of part of the pin 9.

[0026] The aforementioned heating or cooling element 61 is obtained through external purchase, such as a heating rod or a semiconductor cooling chip, which falls within the scope of existing technology and will not be elaborated here.

[0027] An air inlet pressurizing component 33 is provided at the upper end of the glue supply cylinder 31; a protective shell 34 is provided on the outside of the heat-conducting sleeve 6 sleeved on the outside of the glue supply cylinder 31; a sealing ring 17 is provided inside the glue inlet body 1 and between the guide sleeve 14 and the glue outlet channel 42 and is fitted on the outside of the firing pin 3.

[0028] The lower surface of the aforementioned glue-feeding body 1 has a mounting protrusion 51. The aforementioned nozzle 2 is mounted on the lower end face of the aforementioned mounting protrusion 51 via a mounting seat 52. The aforementioned mounting seat 52, which has internal threads, is connected to the mounting protrusion 51, which has external threads, via threads.

[0029] The aforementioned heat insulation block 82 is a ceramic heat insulation block, the aforementioned heat insulation block 82 is a spherical heat insulation block, the aforementioned groove 81 is a spherical groove; the aforementioned groove 81 and heat insulation block 82 are each provided in 4 units, and are respectively provided at the 4 corners of the mounting block 7; the aforementioned heat-conducting sleeve 6 is a metal heat-conducting sleeve, such as an aluminum heat-conducting sleeve.

[0030] Working principle: The mounting block is fixed to the lower end face of the valve body by bolts. The mounting block and the lower end face of the valve body are isolated by ceramic heat insulation balls to avoid heat transfer between the two, especially heat from the mounting block to the valve body. During normal use, the glue injection body is embedded in the mounting groove of the mounting block. At this time, the pin is in the first position, and part of the limiting ball located outside the second groove is embedded in the first groove on the body under the action of the pin, thereby realizing the connection between the glue injection body and the mounting block. During the dispensing process, the adhesive liquid in the glue supply cylinder, glue inlet channel and glue outlet channel is heated or cooled by the heating or cooling elements in the heat-conducting sleeve, thereby ensuring the quality of the adhesive when it is sprayed out. The heating and cooling elements are all purchased externally and are within the scope of existing technology, so they will not be described in detail here. The glue in the glue supply cylinder enters the glue inlet channel on the glue inlet body through the connecting tube, and then enters the glue outlet channel. The lower end of the impact pin, which cooperates with the nozzle, penetrates into the glue outlet channel. Through repeated impacts between the impact pin and the nozzle, the glue in the glue outlet channel is sprayed out from the lower end of the nozzle to perform the dispensing operation. Specifically: after the piezoelectric column is energized, it expands downward to create a thrust on the right end of the second lever, which causes the left end of the second lever, which rotates around the second protrusion, to push the impact pin downward to strike the nozzle and dispense glue. After the piezoelectric column is de-energized, it retracts, and the nested reset spring and the second spring reset respectively, so that the impact pin and the second lever return to their initial positions. The excitation voltage of the piezoelectric column is a square wave. Therefore, the impact pin performs high-speed reciprocating motion under the action of the piezoelectric column, so that the glue can be continuously sprayed out from the nozzle. During initial debugging, loosening the fastening bolts allows adjustment of the initial distance between the striker and the nozzle by rotating the screw threaded into the valve body in either the forward or reverse direction. Specifically: when rotating the screw forward, it pushes the left end of the first lever downward. The first lever, rotating around the first protrusion, pushes the piezoelectric column downward, and the downward force is transmitted to the striker through the second lever, causing the striker to move downward and the distance between the striker and the nozzle to decrease. When rotating the screw in the reverse direction, it moves upward, and the left end of the first lever moves upward with the screw under the action of the first spring. Finally, the second lever moves upward under the action of the second spring, and the striker moves upward with the second lever under the action of the return spring, increasing the distance between the striker and the nozzle. After the initial distance between the striker and the nozzle is adjusted, tightening the fastening bolts locks the first and second clamping parts, preventing the screw from rotating and avoiding inconsistent dispensing due to the movement of the screw during dispensing. In the above process, the heat from the adhesive injection body can be prevented from being conducted to the temperature-sensitive piezoelectric column in the valve body, thus avoiding interference and affecting the accuracy and quality of the adhesive spraying. When it is necessary to disassemble the glue injection body, first use the wrench to rotate the pin to the second position. At this time, the second groove on the pin faces the limiting ball. Then, rotate the glue injection body around the ejector pin in the glue dispensing channel until the glue injection body is rotated out of the mounting slot of the mounting block. During this process, the limiting ball moves into the second groove on the pin under the push of the body, thereby losing the limiting of the glue injection body and allowing the glue injection body to rotate. Next, move the glue injection body that has been rotated out of the mounting slot downward until the disassembly is completed. The guide sleeve, ejector pin and nozzle installed on the glue injection body are also removed together for easy replacement and cleaning later. When it is necessary to install the glue injection unit, simply perform the operation in the reverse of disassembly.

[0031] When using the above-mentioned piezoelectric ceramic jet dispensing system, in addition to adjusting the temperature of the glue liquid from the glue tank to the dispensing channel through heating or cooling to ensure dispensing accuracy and quality, it can isolate the heat transfer between the glue injection body and the valve body, avoiding the interference of temperature changes on the piezoelectric column inside the valve body and affecting the dispensing performance. Furthermore, it realizes a quick-release design between the glue injection module and the valve body, which can not only achieve stable installation of the glue injection body with internal flow channels, but also allow for rotational disassembly and assembly of the glue injection body, the ejector pin, and the nozzle without interfering with the internal component structure of the valve body. This avoids damage to the ejector pin and facilitates high-frequency cleaning of the disassembled glue injection body, ejector pin, and nozzle. Furthermore, it can improve the stability of the second lever and the impact pin that moves with the second lever during repeated high-frequency movement, as well as the consistency of the dispensing gap formed between the impact pin and the nozzle and the impact force between them, thereby improving the dispensing accuracy and stability during long-term use. In addition, a horizontal groove and a vertical groove above the horizontal groove are respectively provided on the outer side of the valve body and the upper part of the rotary screw, thereby forming a first clamping part and a second clamping part around the rotary screw. The first clamping part and the second clamping part are connected by a fastening bolt. The distance between the impact pin and the nozzle can be adjusted by rotating the rotary screw, and the rotary screw can be locked after adjustment to avoid inconsistent dispensing caused by the movement of the rotary screw during dispensing.

[0032] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A piezoelectric ceramic jet dispensing system, comprising: The system comprises a glue supply cylinder (31), a valve body (22) with an internal receiving groove (21), a glue inlet body (1) with a glue inlet channel (41) and a glue outlet channel (42) respectively, a nozzle (2) mounted on the glue inlet body (1), and a striking pin (3) that cooperates with the nozzle (2). The glue outlet at the lower end of the glue supply cylinder (31) is connected to the end of the glue inlet channel (41) on the glue inlet body (1) away from the glue outlet channel (42) through a connecting pipe (32). The lower end of the glue outlet channel (42), which is connected to the end of the glue inlet channel (41) away from the glue supply cylinder (31) at the upper end, is connected to the nozzle (2). The feature is that: an installation hole (16) is opened on the upper surface of the glue injection body (1) and directly above the glue outlet channel (42). The lower end of a guide sleeve (14) through which the impact pin (3) can pass is installed in the installation hole (16) by thread. The upper end of the guide sleeve (14) passes through the lower end opening of the valve body (22) and enters the receiving groove (21) of the valve body (22). The upper part of the impact pin (3) installed in the guide sleeve (14) is located in the receiving groove (21). The lower end of the impact pin (3) passes into the glue outlet channel (42) of the glue injection body (1) and cooperates with the nozzle (2). A heat-conducting sleeve (6) is provided on the outside of both the glue inlet body (1) and the glue supply cylinder (31). At least one heating or cooling element (61) is embedded in each heat-conducting sleeve (6). The heat-conducting sleeve (6) on the outside of the glue inlet body (1) is located on the outside of the area where the glue inlet channel (41) and the glue outlet channel (42) are opened. One end of the glue inlet body (1) opposite to the heat-conducting sleeve (6) is connected to the lower end face of the valve body (22) through a mounting block (7). A mounting groove (71) for the glue inlet body (1) to be embedded is opened on the side surface of the mounting block (7). Several grooves (81) are spaced apart on the upper surface of the mounting block (7) facing the valve body (22). A heat insulation block (82) is embedded in each groove (81). The upper end face of the heat insulation block (82) is higher than the upper surface of the mounting block (7) and is used to contact the lower end face of the valve body (22) facing the mounting block (7). A mounting hole (10) extending horizontally is provided on the side surface of the mounting block (7) above or below the glue injection body (1). A pin (9) is rotatably installed in the mounting hole (10). A guide hole (11) communicating with the mounting hole (10) is provided on the side wall of the mounting groove (71) facing the glue injection body (1). A limiting ball (12) that can slide vertically between the pin (9) and the glue injection body (1) is provided in the vertically extending guide hole (11). A first groove (131) corresponding to the limiting ball (12) is provided on the side surface of the glue injection body (1). A second groove (132) corresponding to the limiting ball (12) is provided on the outer surface of the pin (9). When the limiting ball (12) is located outside the second groove (132), the limiting ball (12) embedded in the first groove (131) is in abutting contact with the pin (9).

2. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: The valve body (22) has a first lever (23), a piezoelectric column (24), and a second lever (25) arranged sequentially from top to bottom in the receiving groove (21). The right end of the first lever (23) is rotatably connected to the inner wall of the receiving groove (21) above it through a first protrusion (231) and a first groove (232) that cooperate with each other. The right end of the second lever (25) is connected to the inner wall of the receiving groove (21) below it through a second protrusion (251) that cooperates with each other. Rotatably connected to the second groove (252), the upper end of the piezoelectric column (24) is in rotatable contact with the first lever (23) through a mutually cooperating third protrusion (241) and third groove (242), and the lower end of the piezoelectric column (24) is in rotatable contact with the second lever (25) through a mutually cooperating fourth protrusion (243) and fourth groove (244). The third protrusion (241) and third groove (242) are located near the right end of the first lever (23) and are positioned on the first protrusion. On the left side of the first groove (232) and the second groove (231), the fourth protrusion (243) and the fourth groove (244) are located near the right end of the second lever (25) and on the left side of the second protrusion (251) and the second groove (252). A support column (26) is provided in the receiving groove (21) of the valve body (22) and below the left end of the first lever (23). A first spring (271) is provided between the support column (26) and the lower surface of the left end of the first lever (23). The lower end of a rotary screw (28) mounted on the valve body (22) contacts the upper surface of the left end of the first lever (23). A second spring (272) is provided between the lower surface of the second lever (25) and the inner wall of the bottom of the receiving groove (21). The lower surface of the left end of the second lever (25) contacts the upper end face of the striker (3). A return spring (15) is provided between the lower end face of the radially outward flange (301) of the upper end of the striker (3) and the guide sleeve (14).

3. The piezoelectric ceramic jet dispensing system according to claim 2, characterized in that: The second spring (272), which is in contact with the lower surface of the left end of the second lever (25), is fitted on the outside of the return spring (15) and the guide sleeve (14) and is coaxially arranged with the return spring (15).

4. The piezoelectric ceramic jet dispensing system according to claim 2 or 3, characterized in that: A horizontal groove (221) and a vertical groove (222) above the horizontal groove (221) are respectively provided on the outer side of the valve body (22) and the upper part of the rotary screw (28), thereby forming a first clamping part (291) and a second clamping part (292) around the rotary screw (28), and the first clamping part (291) and the second clamping part (292) are connected by a fastening bolt (30).

5. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: The mounting block (7) has an extension (72) extending in the direction of the guide sleeve (14), and a limiting through hole (73) is provided on the extension (72) for the guide sleeve (14) to pass through.

6. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: The other end of the pin (9), which is embedded in the mounting hole (10) and located on the outside of the mounting block (7), has a wrench part (91).

7. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: An air inlet pressurization assembly (33) is provided at the upper end of the glue supply cylinder (31).

8. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: A protective shell (34) is provided on the outside of the heat-conducting sleeve (6) fitted on the outside of the glue supply cylinder (31).

9. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: The glue inlet body (1) has a sealing ring (17) fitted on the outside of the ejector pin (3) and located between the guide sleeve (14) and the glue outlet channel (42).

10. The piezoelectric ceramic jet dispensing system according to claim 1, characterized in that: The lower surface of the glue injection body (1) has a mounting protrusion (51), and the nozzle (2) is mounted on the lower end face of the mounting protrusion (51) through a mounting seat (52). The mounting seat (52) with internal threads and the mounting protrusion (51) with external threads are connected by threads.

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