Piezoelectric jet type dispensing system

Abstract

A mounting hole is formed in the upper surface of a glue inlet body and located over a glue outlet runner, the lower end of a guide sleeve through which a firing pin can penetrate is mounted in the mounting hole through threads, and the upper end of the guide sleeve penetrates into a containing groove of a valve body from an opening in the lower end of the valve body. The upper portion of a firing pin installed in the guide sleeve is located in the containing groove, the lower end of the firing pin penetrates into a glue outlet runner of the glue inlet body and is matched with the nozzle, the outer side of the glue inlet body and the outer side of the glue supply barrel are each provided with a heat conduction sleeve, and an installation block is installed on the outer side of the end, opposite to the heat conduction sleeves, of the glue inlet body in a sleeving mode and connected with the lower end face of the valve body. A plurality of grooves are formed in the upper surface, facing the valve body, of the installation block at intervals, and a heat insulation block is installed in each groove in an embedded mode. According to the utility model, the firing pin and the nozzle can be disassembled while the glue inlet body is disassembled, and the influence on the glue outlet performance due to the interference of temperature change on the piezoelectric cylinder in the valve body can be avoided.

Description

Technical Field

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

[0002] To meet increasingly stringent packaging requirements, dispensing technology is gradually shifting from contact dispensing to jet dispensing (non-contact) dispensing. Jet dispensing utilizes a high-frequency vibrating ejector pin to drive fluid at high speed from a nozzle. Compared to contact dispensing, it offers advantages such as faster response time, smaller droplet volume, and higher dispensing accuracy. Currently, jet dispensing is achieved through piezoelectrically driven fluid jet valves. These valves are a crucial component of fluid jetting devices, primarily consisting of a valve body, a piezoelectric actuator housed within the valve body, an amplifier, and flow channel components. The amplifier amplifies the deformation of the piezoelectric ceramic in the actuator after energization using a lever principle, transmitting this amplification to the jet pusher in the flow channel component. The jet pusher then ejects the adhesive from the flow channel component. Due to the inherent properties of adhesives (such as hot melt adhesives), some adhesives require heating or cooling before jet dispensing. The piezoelectric element within the jet valve is temperature-sensitive, and the heating or cooling temperatures applied to the adhesive can negatively impact the jet valve. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a piezoelectric jet dispensing system. This piezoelectric jet dispensing system can disassemble the ejector pin and nozzle simultaneously when the dispensing body is disassembled for high-frequency cleaning. It can also avoid the interference of temperature changes on the piezoelectric column in the valve body, which would affect the dispensing performance.

[0004] To solve the above technical problems, the technical solution adopted by this utility model is: a piezoelectric 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, whose upper end is connected to the end of the glue inlet channel away from the glue supply cylinder, 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.

[0005] 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 contains 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. A mounting block is fitted onto the outer side of the glue inlet body opposite to the heat-conducting sleeve and is connected to the lower end face of the valve body. The mounting block has several grooves spaced apart on the upper surface of the valve body. Each groove contains a heat insulation block. 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.

[0006] The following are further improvements to the above technical solution:

[0007] 1. In the above scheme, an air inlet pressurization component is provided at the upper end of the glue supply cylinder.

[0008] 2. 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.

[0009] 3. 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.

[0010] 4. In the above scheme, the heat insulation block is a ceramic heat insulation block.

[0011] 5. In the above scheme, the heat insulation block is a spherical heat insulation block, and the groove is a spherical groove.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0013] This utility model relates to a piezoelectric jet dispensing system. The upper surface of the dispensing body has a mounting hole directly above the dispensing channel. A guide sleeve, through which a firing pin passes, is threaded into this mounting hole. The upper end of the guide sleeve extends from the lower opening of the valve body into a receiving groove. The upper part of the firing pin, installed in the guide sleeve, is located within the receiving groove, and the lower end of the firing pin extends into the dispensing channel of the dispensing body and engages with the nozzle. Both the dispensing body and the dispensing cylinder have a heat-conducting sleeve on their outer sides. Each heat-conducting sleeve contains at least one heating or cooling element. The heat-conducting sleeve on the outer side of the dispensing body is located outside the area where the dispensing and dispensing channels are located. A mounting block is fitted onto the dispensing body opposite to the dispensing channel. The outer side of one end of the heat-conducting sleeve is connected to the lower end face of the valve body. The mounting block has several grooves spaced apart on the upper surface of the valve body. Each groove contains an insulating block. The upper end face of the insulating 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. In addition to adjusting the temperature of the glue liquid from the glue bucket to the glue outlet channel by heating or cooling to ensure glue dispensing accuracy and quality, the ejector pin and nozzle can be disassembled at the same time when the glue inlet body is disassembled. This facilitates high-frequency cleaning of the disassembled glue inlet body, ejector pin and nozzle. It can also isolate the heat transfer between the glue inlet body and the valve body, and avoid the interference of temperature changes on the piezoelectric column in the valve body, which would affect the glue dispensing performance. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the piezoelectric jet dispensing system of this utility model;

[0015] Appendix Figure 2 This is a cross-sectional view of the piezoelectric jet dispensing system of this utility model;

[0016] Appendix Figure 3 for Figure 2 Enlarged schematic diagram of local structure Figure 1 ;

[0017] Appendix Figure 4 for Figure 2 Enlarged schematic diagram of local structure Figure 2 ;

[0018] Appendix Figure 5 This is a partial structural cross-sectional view of the piezoelectric jet dispensing system of this utility model from one direction;

[0019] Appendix Figure 6 This is a partial structural cross-sectional view of the piezoelectric jet dispensing system of this utility model from another direction.

[0020] 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; 81. Groove; 82. Heat insulation block; 14. Guide sleeve; 15. Return spring; 16. Mounting hole; 17. Sealing ring; 21. Receiving groove; 22. Valve body; 23. First lever; 2 31. First protrusion; 232. First groove; 24. Piezoelectric column; 241. Third protrusion; 242. Third groove; 243. Fourth protrusion; 244. Fourth groove; 25. Second lever; 251. Second protrusion; 252. Second groove; 26. Support column; 271. First spring; 272. Second spring; 28. Adjusting screw; 31. Glue supply cylinder; 32. Connecting pipe; 33. Air intake pressurization assembly; 34. Protective shell. Detailed Implementation

[0021] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0022] Example 1: A piezoelectric 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 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 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.

[0023] 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. A mounting block 7 is fitted on the outer side of the glue inlet body 1 opposite to the heat-conducting sleeve 6 and is connected to the lower end face of the valve body 22. The mounting block 7 has several grooves 81 spaced apart on the upper surface of 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.

[0024] 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 outer side 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, which is fitted on the outer side of the ejector pin 3.

[0025] 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 that cooperate with each other. 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 that cooperate with each other. The upper end of the piezoelectric column 24 is connected to the first lever 23 via a... The third protrusion 241 and the third groove 242 are in rotatable contact with each other. The lower end of the piezoelectric column 24 and the second lever 25 are in rotatable contact with each other through the fourth protrusion 243 and the fourth groove 244. The third protrusion 241 and the third groove 242 are located near the right end of the first lever 23 and are located to the left of the first protrusion 231 and the first groove 232. The fourth protrusion 243 and the fourth groove 244 are located near the right end of the second lever 25 and are located to the left of the second protrusion 251 and the second groove 252.

[0026] 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 is in contact with the striking pin. The upper end face of the striker 3 is in contact with the lower end face of the radially outward flange 301 of the upper end of the striker 3 and the guide sleeve 14. A return spring 15 is provided between the lower end face of the flange 301 of the upper end of the striker 3 and the guide sleeve 14. The surface of the rotary 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.

[0027] Example 2: A piezoelectric 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 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 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.

[0028] 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. A mounting block 7 is fitted on the outer side of the glue inlet body 1 opposite to the heat-conducting sleeve 6 and is connected to the lower end face of the valve body 22. The mounting block 7 has several grooves 81 spaced apart on the upper surface of 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. The mounting block 7 is fixedly installed on the lower end face of the valve body 22 by bolts. The mounting block 7 and the lower end face of the valve body 22 are isolated by ceramic heat insulation balls 82 to avoid heat transfer between the two, especially to conduct the heat on the mounting block 7 to the valve body 22.

[0029] 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.

[0030] The aforementioned heat insulation block 82 is a ceramic heat insulation block; the aforementioned heat insulation block 82 is a spherical heat insulation block, and 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 mounting block 7 is a C-shaped mounting block, and one end of the aforementioned glue injection body 1 is embedded in the C-shaped groove formed by the C-shaped mounting block.

[0031] The aforementioned heat-conducting sleeve 6 is a metal heat-conducting sleeve, such as an aluminum heat-conducting sleeve; the lower surface of the aforementioned adhesive injection body 1 has a mounting protrusion 51, and the aforementioned nozzle 2 is mounted on the lower end face of the aforementioned mounting protrusion 51 through a mounting seat 52, and the aforementioned mounting seat 52 with internal threads and the mounting protrusion 51 with external threads are connected by threads.

[0032] Working principle:

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] When the glue injection body is disassembled, the guide sleeve, impact pin and nozzle installed on the glue injection body are also removed, which facilitates subsequent replacement and cleaning.

[0038] When using the above-mentioned piezoelectric jet dispensing system, in addition to adjusting the temperature of the glue liquid from the glue tank to the dispensing channel by heating or cooling to ensure dispensing accuracy and quality, the ejector pin and nozzle can be disassembled at the same time when the glue injection body is disassembled. This facilitates high-frequency cleaning of the disassembled glue injection body, ejector pin and nozzle, and can also isolate the heat transfer between the glue injection body and the valve body, avoiding the interference of temperature changes on the piezoelectric column in the valve body and affecting the dispensing performance.

[0039] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A piezoelectric 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. A mounting block (7) is fitted on the outside of the glue inlet body (1) opposite to the heat-conducting sleeve (6) and connected to the lower end face of the valve body (22). The mounting block (7) has several grooves (81) spaced apart on the upper surface of 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).

2. The piezoelectric 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).

3. The piezoelectric 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).

4. The piezoelectric 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).

5. The piezoelectric jet dispensing system according to claim 1, characterized in that: The heat insulation block (82) is a ceramic heat insulation block.

6. The piezoelectric jet dispensing system according to claim 1 or 5, characterized in that: The heat insulation block (82) is a spherical heat insulation block, and the groove (81) is a spherical groove.

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