Piezoelectric dispensing valve suitable for high-viscosity glue

Abstract

The utility model discloses a piezoelectric dispensing valve suitable for high-viscosity glue, which belongs to the technical field of piezoelectric injection valves and comprises a valve body and a liquid box component, a firing pin is arranged in the valve body in a sliding manner, a nozzle is arranged at the bottom of the liquid box component, and one end of the firing pin protrudes out of the valve body and is assembled with the nozzle in a matched manner; the liquid box assembly comprises a liquid box body and a heating block, the heating block is located on one side of the liquid box body, the liquid box body is obliquely arranged on one side of the valve body and comprises a nozzle installation part and a liquid inlet connector part, the nozzle installation part is provided with a liquid storage cavity, and the nozzle is installed in the nozzle installation part and communicated with the liquid storage cavity. The heating block is arranged on the outer side of the liquid box assembly, the situation that glue is solidified due to the too low temperature is avoided, the distance between the liquid box assembly and the valve body is reduced through inclined arrangement, and the liquid box assembly can conveniently stretch into a small-space structure to conduct glue dispensing.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric jet valve technology, and in particular to a piezoelectric dispensing valve suitable for high viscosity adhesives. Background Technology

[0002] Piezoelectric dispensing valves are high-precision, high-speed dispensing devices widely used in various high-tech manufacturing fields such as electronics, semiconductors, and solar energy. Their working principle is based on the properties of piezoelectric ceramic materials; voltage changes cause mechanical deformation of the ceramic sheet, which in turn drives the valve to open and close, achieving precise control of the dispensing liquid. Piezoelectric dispensing valves are particularly suitable for scenarios requiring high-precision dispensing, such as chip packaging and LED screen manufacturing in the semiconductor industry. In these applications, piezoelectric dispensing valves can fully leverage their advantages of high precision, high speed, and high reliability to improve production efficiency and product quality.

[0003] Existing technology, such as Chinese Patent Publication No. CN218742847U, discloses a heated dispensing device, including a housing. The housing has a glue storage cavity and an installation cavity inside. The installation cavity is located on the right side of the glue storage cavity. An electric telescopic rod is installed in the installation cavity. A push block is connected to the output end of the electric telescopic rod. A sealing gasket is connected to the outer wall of the push block. The sealing gasket is in close contact with the glue storage cavity. A heating wire is provided on the outer wall of the housing.

[0004] The aforementioned patent prevents high-viscosity colloids from curing by setting heating wires on the outside of the housing. However, the addition of heating components next to the liquid box and nozzle results in an excessively large overall volume, making it inconvenient to dispensing in the space of small structures that require dispensing, such as existing circuit boards with many precision protruding components. The nozzle cannot be inserted into the dispensing position to dispensing, and the adhesive is easily dispensed onto the components. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical problems and provide a piezoelectric dispensing valve suitable for high-viscosity adhesives.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A piezoelectric dispensing valve suitable for high-viscosity adhesives includes a valve body and a liquid cartridge assembly. A striker is slidably disposed inside the valve body. A nozzle is disposed at the bottom of the liquid cartridge assembly. One end of the striker protrudes from the valve body and mates with the nozzle. The liquid cartridge assembly includes a main body and a heating block located on one side of the main body. The main body is inclined on one side of the valve body. The main body includes a nozzle mounting portion and a liquid inlet portion. The nozzle mounting portion has a liquid storage chamber. The nozzle is mounted within the nozzle mounting portion and communicates with the liquid storage chamber. The liquid inlet portion has a flow channel, one end of which is connected to an inlet pipe, and the other end communicates with the liquid storage chamber.

[0008] The preferred embodiment of this utility model is that the heating block is fitted to the outside of the liquid box body, and the nozzle is disposed inside the heating block located at the bottom of the liquid box body.

[0009] The preferred technical solution of this utility model is that an adjustment component is provided inside the valve body; the adjustment component includes an adjustment rod and an adjustment valve seat, one end of the adjustment valve seat is located above the liquid box body and is assembled and connected to the liquid box assembly, the impact pin is located inside the adjustment valve seat, and the adjustment rod is installed at the other end of the adjustment valve seat. By controlling the adjustment rod to drive the adjustment valve seat to move, the liquid box assembly is driven to move, thereby adjusting the distance between the impact pin and the nozzle.

[0010] A preferred embodiment of this invention is that a placement groove is provided between the nozzle mounting portion and the liquid inlet portion, and the side of the valve body near the liquid box assembly is located in the placement groove.

[0011] The preferred technical solution of this utility model is that a heat dissipation block is installed on the side wall of the valve body, and a heat dissipation channel is formed inside the heat dissipation block.

[0012] The preferred technical solution of this utility model is that a piezoelectric drive mechanism and a control circuit board are also installed in the valve body. The control circuit board is used to control the operation of the piezoelectric drive mechanism and is electrically connected to the electrical connector provided on the valve body. The end of the striker away from the nozzle is driven and connected to the piezoelectric drive mechanism.

[0013] The preferred technical solution of this utility model is that the liquid box body includes a liquid inlet interface and a nozzle mounting part, the liquid inlet interface is obliquely connected to the nozzle mounting part, the heating block includes a liquid box part and a nozzle part, the liquid box part is obliquely connected to the nozzle part; the liquid box part is located on one side of the liquid inlet interface part, and the nozzle part is located at the bottom of the nozzle mounting part.

[0014] The preferred technical solution of this utility model is that at least one limiting post is also provided in the valve body, the limiting post is fixed in the valve body, and a limiting step is provided on the regulating valve seat. The limiting step is adapted to the limiting post so that the limiting step can be locked on the limiting post.

[0015] The preferred technical solution of this utility model is that the piezoelectric drive mechanism includes a transmission arm column and a transmission fixed seat. The transmission fixed seat is fixed in the valve body, and the transmission arm column is rotatably mounted on the transmission fixed seat. One end of the transmission arm column is rotatably disposed on the transmission fixed seat, and the other end of the transmission arm column is located in the regulating valve seat and between the regulating rod and the striking pin.

[0016] A preferred embodiment of this invention is that the piezoelectric drive mechanism further includes a return spring, which is sleeved on the outside of the striker.

[0017] The beneficial effects of this utility model are as follows:

[0018] (1) By setting a heating block on the outside of the liquid box assembly, the glue is prevented from curing due to low temperature, further reducing the risk of glue residue and nozzle blockage.

[0019] (2) By tilting the liquid box body and the piezoelectric drive mechanism for controlling dispensing, and with the nozzle located at the bottom, the piezoelectric dispensing valve can dispense in a structure with limited space, which improves the reliability and stability of dispensing and adapts to a wider range of high viscosity adhesive dispensing needs.

[0020] (3) By opening a placement groove on the liquid box body, the distance between the liquid box body and the valve body is reduced, the size of the dispensing valve is reduced, and it is convenient to accurately dispense various electronic components. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a piezoelectric dispensing valve suitable for high-viscosity adhesives provided in a specific embodiment of this utility model;

[0022] Figure 2 This is a front view of the overall structure of the piezoelectric dispensing valve suitable for high-viscosity adhesives provided in a specific embodiment of this utility model;

[0023] Figure 3 yes Figure 2 Cross-sectional view of AA in the middle;

[0024] Figure 4 This is a schematic diagram of the overall structure of the heating block of the piezoelectric dispensing valve for high-viscosity adhesives provided in a specific embodiment of this utility model.

[0025] Figure 5This is a schematic diagram of the piezoelectric dispensing valve for high-viscosity adhesives provided in a specific embodiment of this utility model.

[0026] Figure 6 This is a schematic diagram of the overall structure of the heat sink and heat dissipation channel of the piezoelectric dispensing valve for high viscosity adhesives provided in a specific embodiment of this utility model.

[0027] Figure 7 This is a schematic diagram of the piezoelectric dispensing valve for high-viscosity adhesives provided in a specific embodiment of this utility model.

[0028] Figure 8 This is a schematic diagram of the piezoelectric dispensing valve for high-viscosity adhesives provided in a specific embodiment of this utility model.

[0029] Figure 9 This is a schematic diagram of the overall structure of the liquid box body of the piezoelectric dispensing valve suitable for high viscosity adhesives provided in a specific embodiment of this utility model.

[0030] Figure 10 This is a side view of the overall structure of the liquid box body of the piezoelectric dispensing valve suitable for high viscosity adhesives provided in a specific embodiment of this utility model.

[0031] Figure 11 This is a front view of the overall structure of the liquid box body, nozzle, and inlet pipe of the piezoelectric dispensing valve suitable for high viscosity adhesives provided in a specific embodiment of this utility model.

[0032] Figure 12 yes Figure 11 Cross-sectional view of BB in the middle;

[0033] In the picture:

[0034] 1. Valve body; 2. Liquid box assembly; 201. Liquid box body; 2011. Placement slot; 2012. Liquid inlet interface; 2013. Nozzle mounting part; 2014. Flow channel; 202. Heating block; 2021. Liquid box part; 2022. Nozzle part; 3. Impact pin; 4. Nozzle; 5. Adjusting rod; 6. Adjusting valve seat; 601. Limiting step; 7. Liquid inlet pipe; 8. Heat sink; 801. Heat dissipation channel; 9. Control circuit board; 10. Limiting post; 11. Transmission arm post; 12. Transmission fixing seat; 13. Return spring. Detailed Implementation

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1-12As shown, this utility model provides a piezoelectric dispensing valve suitable for high-viscosity adhesives, including a valve body 1 and a liquid cartridge assembly 2. A striker 3 is slidably disposed inside the valve body 1, and a nozzle 4 is disposed at the bottom of the liquid cartridge assembly 2. One end of the striker 3 protrudes from the valve body 1 and is fitted with the nozzle 4. The liquid cartridge assembly 2 includes a liquid cartridge body 201 and a heating block 202. The heating block 202 is fitted to the outside of the liquid cartridge body 201. The nozzle 4 is disposed inside the heating block 202 located at the bottom of the liquid cartridge body 201. The liquid cartridge body 201 is inclined to one side of the valve body 1, making the installation between the liquid cartridge assembly 2 and the valve body 1 more compact. This does not affect liquid inlet and spraying, while allowing for a larger spraying range, enabling the spraying of complex electronic components and improving dispensing accuracy.

[0037] Specifically, the liquid container assembly 2 includes a liquid container body 201. The tilt angle of the liquid container body 201 can be adjusted according to actual needs, generally between 120° and 150°, to ensure that the liquid can flow smoothly into the nozzle 4 under the action of gravity. The liquid container body 201 includes a liquid inlet interface 2012 and a nozzle mounting part 2013. The nozzle mounting part 2013 is provided with a liquid storage chamber, and the liquid inlet interface 2012 is provided with a flow channel 2014. One end of the flow channel 2014 is connected to the liquid inlet pipe 7, and the other end is connected to the liquid storage chamber.

[0038] A placement groove 2011 is provided between the liquid inlet interface 2012 and the nozzle mounting part 2013. The bottom of the valve body 1 is embedded in the placement groove 2011 to ensure that the two fit tightly and avoid glue leakage. This allows the liquid box body 201 and the valve body 1 to fit more closely, reducing the space occupied by the dispensing valve and enabling better dispensing of electronic components with special structures.

[0039] The heating block 202 can be made of copper or aluminum, which has good thermal conductivity. A heating element, such as a resistance wire or heating film, is embedded within the heating block 202. Temperature is controlled by the control circuit board 9 to ensure the adhesive is within a suitable temperature range and to prevent curing due to excessively low temperatures. The temperature of the heating block 202 can be monitored in real time by a temperature sensor, which feeds back to the control circuit board 9 to achieve closed-loop control. The temperature sensor can be a thermocouple or a thermistor, characterized by fast response and high accuracy. The control circuit board 9 can integrate a PID controller to automatically adjust the heating power and ensure temperature stability.

[0040] The heating block 202 maintains the temperature of the adhesive inside the liquid tank body 201, preventing the adhesive from curing due to excessively low temperature and further reducing the risk of adhesive residue and nozzle 4 clogging. Combined with the tilted liquid tank body 201 and the piezoelectric drive mechanism, high-precision dispensing is achieved, improving the reliability and stability of dispensing and adapting to a wider range of high-viscosity adhesive dispensing needs.

[0041] The heating block 202 includes a liquid box portion 2021 and a nozzle portion 2022. The liquid box portion 2021 is inclinedly disposed on the nozzle portion 2022 and cooperates with the liquid inlet portion 2012 and the nozzle mounting portion 2013 of the liquid box body 201 respectively for heating. The nozzle portion 2022 is located below the nozzle mounting portion 2013 and covers the nozzle 4.

[0042] The diameter of nozzle 4 can be selected according to the viscosity of the adhesive and the dispensing requirements. Nozzle 4 can adopt a conical outlet to reduce the residence time of the adhesive in nozzle 4 and reduce the risk of clogging.

[0043] One end of the striking pin 3 protrudes out of the valve body 1 and is assembled with the nozzle 4. The length of the striking pin 3 can be adjusted according to the height of the liquid box body 201 and the position of the nozzle 4.

[0044] The liquid tank body 201 is also connected to a liquid inlet pipe 7. The liquid inlet pipe 7 can be a Luer connector hose, and the specific material can be polytetrafluoroethylene (PTFE) or silicone rubber to ensure flexibility and chemical resistance. The liquid inlet pipe 7 can be connected by a quick connector or a threaded connection for easy disassembly and cleaning.

[0045] The valve body 1 is also equipped with an adjustment component, which includes an adjustment rod 5 and an adjustment valve seat 6. One end of the adjustment valve seat 6 is located above the liquid box body 201 and is assembled and connected to the liquid box assembly 2. The impact pin 3 is located inside the adjustment valve seat 6, and the adjustment rod 5 is installed at the other end of the adjustment valve seat 6. By controlling the adjustment rod 5, the adjustment valve seat 6 is moved, which in turn moves the liquid box assembly 2, thereby adjusting the distance between the impact pin 3 and the nozzle 4.

[0046] The valve body 1 also houses a piezoelectric drive mechanism and a control circuit board 9. The control circuit board 9 controls the movement of the piezoelectric drive mechanism and is electrically connected to an electrical connector on the valve body 1. The end of the ejector pin 3 furthest from the nozzle 4 is connected to the piezoelectric drive mechanism. The piezoelectric drive mechanism can use a piezoelectric ceramic sheet or a piezoelectric stack, featuring fast response and high precision. The control circuit board 9 can integrate a microprocessor and sensors to monitor and control the working status of the piezoelectric drive mechanism in real time, ensuring the accuracy and consistency of dispensing.

[0047] A heat sink 8 is installed on the side wall of the valve body 1, and a heat dissipation channel 801 is formed inside the heat sink 8. The heat dissipation channel 801 can be designed in a spiral or straight shape to increase the heat dissipation area and improve the heat dissipation effect. The heat sink 8 is an A6061 type aluminum alloy heat sink 8. Multiple heat dissipation channels 801 are formed on the inner side of the heat sink 8. Multiple screw holes are provided on the heat sink 8. The heat sink 8 is installed on the side wall of the valve body 1 through the screw holes and screws. One end of the heat dissipation channel 801 is connected to the screw hole, and the other end is connected to the outside. There are two heat dissipation channels 801. One end of the heat dissipation channel 801 connected to the outside is the air inlet, and the other end of the heat dissipation channel 801 connected to the outside is the air outlet, which facilitates the flow of air in and out, removes the heat of the valve body 1, and achieves rapid heat dissipation. The heat dissipation channels 801 are arranged in a curved and close arrangement inside the heat sink 8, thereby increasing the heat dissipation surface area of ​​the heat sink 8 and improving the heat dissipation efficiency.

[0048] The tilted liquid tank body 201 and nozzle 4 ensure that the adhesive flows smoothly into the nozzle 4 under gravity, reducing adhesive residue. A piezoelectric drive mechanism and adjustment components precisely control the movement of the ejector pin 3, achieving high-precision dispensing. The heat sink 8 and heat dissipation channel 801 effectively dissipate heat, extending the equipment's lifespan. The overall design improves dispensing accuracy and reliability, reduces maintenance costs, and increases production efficiency.

[0049] At least one limiting post 10 is also provided inside the valve body 1, and the limiting post 10 is fixed inside the valve body 1. A limiting step 601 is provided on the regulating valve seat 6, and the limiting step 601 is adapted to the limiting post 10 so that the limiting step 601 can be locked on the limiting post 10. The length of the limiting post 10 can be adjusted according to the internal space of the valve body 1 to ensure that the limiting post 10 is firmly fixed inside the valve body 1. The limiting step 601 is located at the top and / or bottom of the regulating valve seat 6. In order to ensure that the regulating valve seat 6 does not shift during the movement, it ensures that the distance between the ejector pin 3 and the nozzle 4 is always within the set range, thereby improving the accuracy and stability of dispensing. The cooperation between the limiting post 10 and the limiting step 601 can also play a guiding role, making the movement of the regulating valve seat 6 smoother.

[0050] The piezoelectric drive mechanism includes a transmission arm column 11 and a transmission fixed seat 12. The transmission fixed seat 12 is fixed inside the valve body 1, and the transmission arm column 11 is rotatably mounted on the transmission fixed seat 12. One end of the transmission arm column 11 is rotatably mounted on the transmission fixed seat 12, and the other end of the transmission arm column 11 is located inside the regulating valve seat 6 and between the regulating rod 5 and the striking pin 3.

[0051] The transmission mounting base 12 can be fixed by bolts or welding to ensure that it is firmly fixed inside the valve body 1. The length of the transmission arm 11 can be adjusted according to the internal space of the valve body 1 to ensure that the transmission arm 11 can rotate freely between the transmission mounting base 12 and the regulating valve seat 6.

[0052] One end of the transmission arm column 11 is rotatably mounted on the transmission fixed seat 12, and the other end of the transmission arm column 11 is located inside the adjusting valve seat 6, between the adjusting rod 5 and the striking pin 3. Both ends of the transmission arm column 11 can be supported by bearings to reduce friction and improve transmission efficiency. The rotation of the transmission arm column 11 can convert the linear motion of the adjusting rod 5 into the reciprocating motion of the striking pin 3, achieving high-precision dispensing.

[0053] By setting up the transmission arm column 11 and the transmission fixed seat 12, the linear motion of the adjusting rod 5 is converted into the reciprocating motion of the impact pin 3, achieving high-precision dispensing. Combined with the tilted liquid box body 201, heating block 202 and limiting column 10, the accuracy and stability of dispensing are further improved, maintenance costs are reduced and production efficiency is increased.

[0054] The piezoelectric drive mechanism also includes a return spring 13, which is sleeved around the striker pin 3. The return spring 13 can be made of stainless steel or carbon steel, possessing good elasticity and fatigue resistance. The length of the return spring 13 can be adjusted according to the internal space of the valve body 1, ensuring that the return spring 13 can freely extend and retract outside the striker pin 3. Sleeving around the striker pin 3, the return spring 13 allows for rapid reset after each action of the striker pin 3, ensuring more precise and stable movement of the striker pin 3. The preload of the return spring 13 can be adjusted according to actual needs to ensure that the reset speed and force of the striker pin 3 are appropriate.

[0055] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A piezoelectric glue valve suitable for high viscosity glue, comprising a valve body (1) and a liquid cartridge assembly (2), characterized in that: a striker (3) is arranged inside the valve body (1), a nozzle (4) is arranged at the bottom of the liquid cartridge assembly (2), one end of the striker (3) protrudes out of the valve body (1) and is matched with the nozzle (4); the liquid cartridge assembly (2) comprises a liquid cartridge body (201) and a heating block (202), the heating block (202) is located on one side of the liquid cartridge body (201), the liquid cartridge body (201) is arranged obliquely on one side of the valve body (1), the liquid cartridge body comprises a nozzle mounting portion (2013) and a liquid inlet interface portion (2012), the nozzle mounting portion (2013) is provided with a liquid storage cavity, the nozzle (4) is mounted in the nozzle mounting portion (2013) and communicates with the liquid storage cavity, the liquid inlet interface portion (2012) is provided with a flow channel (2014), one end of the flow channel (2014) is connected with a liquid inlet pipe (7), and the other end communicates with the liquid storage cavity.

2. The piezoelectric glue valve suitable for high viscosity glue according to claim 1, characterized in that: the heating block (202) is arranged on the outside of the liquid cartridge body (201), and the nozzle (4) is arranged in the heating block (202) at the bottom of the liquid cartridge body (201).

3. The piezoelectric glue valve suitable for high viscosity glue according to claim 1, characterized in that: an adjusting assembly is arranged inside the valve body (1); the adjusting assembly comprises an adjusting rod (5) and an adjusting valve seat (6), one end of the adjusting valve seat (6) is located above the liquid cartridge body (201) and is connected with the liquid cartridge assembly (2), the striker (3) is located in the adjusting valve seat (6), the adjusting rod (5) is mounted at the other end of the adjusting valve seat (6), the adjusting valve seat (6) is driven to move by controlling the adjusting rod (5), and then the liquid cartridge assembly (2) is driven to move, so that the distance between the striker (3) and the nozzle (4) is adjusted.

4. The piezoelectric glue valve suitable for high viscosity glue according to claim 1, characterized in that: a placing groove (2011) is arranged between the nozzle mounting portion (2013) and the liquid inlet interface portion (2012), and one side of the valve body (1) close to the liquid cartridge assembly (2) is located in the placing groove (2011).

5. The piezoelectric glue valve suitable for high viscosity glue according to claim 1, characterized in that: a heat dissipation block (8) is mounted on the side wall of the valve body (1), and a heat dissipation channel (801) is formed in the heat dissipation block (8).

6. The piezoelectric glue valve suitable for high viscosity glue according to claim 3, characterized in that: ​ A piezoelectric driving mechanism and a control circuit board (9) are also arranged in the valve body (1), the control circuit board (9) is used for controlling the action of the piezoelectric driving mechanism and is electrically connected with an electrical connector arranged on the valve body (1), and the end of the striker (3) away from the nozzle (4) is drivingly connected with the piezoelectric driving mechanism.

7. The piezoelectric dispensing valve suitable for high-viscosity glue according to claim 4, characterized in that: The liquid inlet interface part (2012) is obliquely connected to the nozzle mounting part (2013), the heating block (202) comprises a liquid box part (2021) and a nozzle part (2022), and the liquid box part (2021) is obliquely connected to the nozzle part (2022); The liquid box part (2021) is located on one side of the liquid inlet interface part (2012), and the nozzle part (2022) is located at the bottom of the nozzle mounting part (2013).

8. The piezoelectric dispensing valve suitable for high-viscosity glue according to claim 3, characterized in that: At least one limiting column (10) is arranged in the valve body (1), the limiting column (10) is fixed in the valve body (1), a limiting step (601) is arranged on the adjusting valve seat (6), the limiting step (601) is matched with the limiting column (10), and the limiting step (601) can be clamped on the limiting column (10).

9. The piezoelectric dispensing valve suitable for high-viscosity glue according to claim 6, characterized in that: The piezoelectric driving mechanism comprises a transmission arm column (11) and a transmission fixed seat (12), the transmission fixed seat (12) is fixed in the valve body (1), and the transmission arm column (11) is rotatably arranged on the transmission fixed seat (12); One end of the transmission arm column (11) is rotatably arranged on the transmission fixed seat (12), and the other end of the transmission arm column (11) is located in the adjusting valve seat (6) and between the adjusting rod (5) and the striker (3).

10. The piezoelectric dispensing valve suitable for high-viscosity glue according to claim 6, characterized in that: The piezoelectric driving mechanism further comprises a reset spring (13), and the reset spring (13) is sleeved outside the striker (3).

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