Jet type piezoelectric glue outlet valve

Abstract

The utility model discloses a jet type piezoelectric glue outlet valve. Comprising a valve body internally provided with a containing groove, a glue supply block arranged on the outer side of the lower end of the valve body and internally provided with a glue flow channel, a nozzle, a firing pin matched with the nozzle, a piezoelectric cylinder vertically arranged in the containing groove and a lever rotationally connected between the lower end of the piezoelectric cylinder and the upper end of the firing pin. A first mounting groove is formed in the valve body, a circular lower convex part is arranged on a connecting seat of which the upper end is connected with the valve body, external threads are arranged on the outer side surface of the circular lower convex part which is coaxially arranged with the glue outlet runner, and a mounting seat is arranged on the outer side of the circular lower convex part in a sleeving manner; and the lower end of a firing pin of which the upper end is matched with one end of the lever penetrates through the circular lower convex part and is in impact fit with the nozzle. According to the utility model, the performance stability and stress consistency of the piezoelectric cylinder and the reset spring can be improved, and the dispensing precision and the dispensing performance stability in the long-term use process are improved.

Description

Technical Field

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

[0002] Piezoelectric jet valves are widely used for high-precision, high-consistency fluid control, enabling non-contact fluid control, such as dispensing and jetting of adhesives and inks. Piezoelectric jet dispensing valves are commonly used in the electronic packaging field. A search revealed a patent with publication number CN213825643U, which discloses a high-speed fluid jet valve, including a valve body with a accommodating cavity, a piezoelectric ceramic stack within the cavity, a swing rod, a striker, a support spring, a second spring, and a dispensing mechanism. This patent controls the swing rod via the piezoelectric ceramic stack within the cavity, which in turn controls the striker to dispense the adhesive delivered by the dispensing mechanism. The support spring and the second spring then reset the swing rod and striker for the next dispensing cycle. In the aforementioned patent, the position of the striker can be adjusted through the linkage between the rotary assembly, the pressure rod, and the swing rod. However, this adjustment method can easily reduce the stability of the piezoelectric ceramic stack and springs during long-term use, thereby reducing the stability of the dispensing performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a jet-type piezoelectric dispensing valve, which can improve the stability and force consistency of the piezoelectric column and the return spring, and improve the dispensing accuracy and dispensing performance stability during long-term use.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a jet-type piezoelectric dispensing valve, comprising: a valve body with an internal receiving groove, a glue supply block disposed on the lower outer side of the valve body and having a glue flow channel inside, a nozzle, a striking pin disposed in conjunction with the nozzle, a piezoelectric column vertically disposed in the receiving groove, and a lever rotatably connected between the lower end of the piezoelectric column and the upper end of the striking pin. The glue supply block, the valve body, and the nozzle are connected by a connecting seat. The connecting seat has an inlet glue flow channel and an outlet glue flow channel that are interconnected. The end of the inlet glue flow channel away from the outlet glue flow channel is connected to the glue flow channel on the glue supply block, and the lower end of the vertically extending outlet glue flow channel away from the inlet glue flow channel is connected to the nozzle.

[0005] A first mounting groove is formed inside the valve body and directly above the piezoelectric column. The upper end of the piezoelectric column is in abutting contact with a fixing block set in the first mounting groove. The lower end face of the connecting seat connected to the valve body has a downwardly extending circular protrusion. The outer surface of the circular protrusion, which is coaxially arranged with the glue outlet channel, is provided with an external thread. A mounting seat is fitted onto the outer side of the circular protrusion and is threadedly connected to the circular protrusion. The nozzle is adjustablely mounted on the lower end of the circular protrusion through the mounting seat. The lower end of the striking pin, whose upper end is engaged with one end of the lever, passes through the circular protrusion and impacts the nozzle.

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

[0007] 1. In the above scheme, the fixing block is formed by splicing a first wedge block and a second wedge block that cooperate with each other. The inclined surface on the second wedge block located above the first wedge block is in sliding cooperation with the inclined surface on the first wedge block. A set screw is embedded in the side wall of the valve body. The set screw pushes and contacts the end face of the second wedge block opposite to the end of the first wedge block. The lower surface of the first wedge block is in abutting contact with the upper end of the piezoelectric column.

[0008] 2. In the above scheme, a second mounting groove communicating with the receiving groove is opened on the lower end surface of the valve body, and the upper end of the connecting seat is embedded in the second mounting groove.

[0009] 3. In the above scheme, the end of the lever away from the firing pin is rotatably connected to the inner wall of the receiving groove below it through a second protrusion and a second groove that cooperate with each other. The lower end of the piezoelectric column is rotatably contacted with the lever through a first protrusion and a first groove that cooperate with each other. The lower surface of the lever near the firing pin has an arc-shaped protrusion that contacts the upper end surface of the firing pin.

[0010] 4. In the above scheme, the firing pin is slidably mounted between the lever and the nozzle via a guide sleeve, and a first return spring is provided between the guide sleeve and the upper end of the firing pin.

[0011] 5. In the above scheme, a second return spring is provided between the lever and the valve body.

[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 jet-type piezoelectric dispensing valve. A first mounting groove is formed within the valve body and directly above the piezoelectric column. The upper end of the piezoelectric column abuts against a fixing block located in the first mounting groove. A connecting seat, whose upper end connects to the valve body, has a downwardly extending circular protrusion on its lower end surface. An external thread is provided on the outer surface of the circular protrusion, which is coaxially aligned with the dispensing channel. A mounting seat is fitted onto the outer side of the circular protrusion and connected to it via threads. A nozzle is adjustablely mounted on the lower end of the circular protrusion via this mounting seat. The lower end of a striker, whose upper end engages with one end of a lever, passes through the circular protrusion and impacts the nozzle. The distance between the striker and the nozzle can be adjusted by adjusting the nozzle position without needing to adjust the striker position via the piezoelectric column and lever. This design ensures that the piezoelectric column, lever, and return spring of the striker remain stationary when adjusting the distance between the striker and the nozzle, thereby improving the stability and force consistency of the piezoelectric column and return spring, and enhancing the dispensing accuracy and performance stability during long-term use. Furthermore, the fixing block is composed of a first wedge block and a second wedge block that cooperate with each other. The inclined surface on the second wedge block, located above the first wedge block, slides in contact with the inclined surface on the first wedge block. A set screw is embedded in the side wall of the valve body, and the set screw pushes against the end face of the second wedge block opposite to the end face of the first wedge block. The lower surface of the first wedge block presses against the upper end of the piezoelectric column, providing space for initial debugging and allowing the return spring to be in a relatively relaxed state before debugging, thus reducing wear on the spring performance. Attached Figure Description

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

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

[0016] Appendix Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0017] Appendix Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0018] Appendix Figure 5 for Figure 2 Enlarged view of a local structure.

[0019] In the above attached figures: 1. Glue flow channel; 2. Glue supply block; 3. Nozzle; 4. Impact pin; 5. Connecting seat; 6. Glue inlet channel; 7. Glue outlet channel; 8. Lever; 9. Second protrusion; 10. Second groove; 11. Arc-shaped protrusion; 12. Circular lower protrusion; 13. Mounting seat; 14. Guide sleeve; 15. First return spring; 16. Second return spring; 17. Fixing block; 18. First wedge block; 19. Second wedge block; 20. Set screw; 21. Receiving groove; 22. Valve body; 23. First mounting groove; 24. Piezoelectric column; 241. First protrusion; 242. First groove; 25. Second mounting groove. Detailed Implementation

[0020] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0021] Example 1: A jet-type piezoelectric dispensing valve includes: a valve body 22 with an internal receiving groove 21, a glue supply block 2 disposed on the lower outer side of the valve body 22 and having a glue flow channel 1 inside, a nozzle 3, a striking pin 4 that cooperates with the nozzle 3, a piezoelectric column 24 vertically disposed in the receiving groove 21, and a lever 8 rotatably connected between the lower end of the piezoelectric column 24 and the upper end of the striking pin 4. The glue supply block 2, the valve body 22, and the nozzle 3 are connected by a connecting seat 5. The connecting seat 5 has an inlet glue flow channel 6 and an outlet glue flow channel 7 that are interconnected. The end of the inlet glue flow channel 6 away from the outlet glue flow channel 7 is connected to the glue flow channel 1 on the glue supply block 2, and the lower end of the vertically extending outlet glue flow channel 7 away from the inlet glue flow channel 6 is connected to the nozzle 3.

[0022] A first mounting groove 23 is provided inside the valve body 22 and directly above the piezoelectric column 24. The upper end of the piezoelectric column 24 is in abutting contact with the fixing block 17 provided in the first mounting groove 23. The lower end surface of the connecting seat 5, whose upper end is connected to the valve body 22, has a downwardly extending circular protrusion 12. The outer surface of the circular protrusion 12, which is coaxially arranged with the glue outlet channel 7, is provided with an external thread. A mounting seat 13 is fitted onto the outer side of the circular protrusion 12 and is threadedly connected to the circular protrusion 12. The nozzle 3 is adjustablely mounted on the lower end of the circular protrusion 12 through the mounting seat 13. The lower end of the striking pin 4, whose upper end is engaged with one end of the lever 8, passes through the circular protrusion 12 and impacts the nozzle 3.

[0023] The end of the lever 8 away from the striker 4 is rotatably connected to the inner wall of the receiving groove 21 located below it through a second protrusion 9 and a second groove 10 that cooperate with each other. The lower end of the piezoelectric column 24 is rotatably contacted with the lever 8 through a first protrusion 241 and a first groove 242 that cooperate with each other. The lower surface of the lever 8 near the striker 4 has an arc-shaped protrusion 11 that contacts the upper end surface of the striker 4.

[0024] A second return spring 16 is provided between the lever 8 and the valve body 22; the striker 4 is slidably installed between the lever 8 and the nozzle 3 through a guide sleeve 14, and a first return spring 15 is provided between the guide sleeve 14 and the upper end of the striker 4.

[0025] Example 2: A jet-type piezoelectric dispensing valve includes: a valve body 22 with an internal receiving groove 21, a glue supply block 2 disposed on the lower outer side of the valve body 22 and having a glue flow channel 1 inside, a nozzle 3, a striking pin 4 that cooperates with the nozzle 3, a piezoelectric column 24 vertically disposed in the receiving groove 21, and a lever 8 rotatably connected between the lower end of the piezoelectric column 24 and the upper end of the striking pin 4. The glue supply block 2, the valve body 22, and the nozzle 3 are connected by a connecting seat 5. The connecting seat 5 has an inlet glue flow channel 6 and an outlet glue flow channel 7 that are interconnected. The end of the inlet glue flow channel 6 away from the outlet glue flow channel 7 is connected to the glue flow channel 1 on the glue supply block 2, and the lower end of the vertically extending outlet glue flow channel 7 away from the inlet glue flow channel 6 is connected to the nozzle 3.

[0026] A first mounting groove 23 is provided inside the valve body 22 and directly above the piezoelectric column 24. The upper end of the piezoelectric column 24 is in abutting contact with the fixing block 17 provided in the first mounting groove 23. The lower end surface of the connecting seat 5, whose upper end is connected to the valve body 22, has a downwardly extending circular protrusion 12. The outer surface of the circular protrusion 12, which is coaxially arranged with the glue outlet channel 7, is provided with an external thread. A mounting seat 13 is fitted onto the outer side of the circular protrusion 12 and is threadedly connected to the circular protrusion 12. The nozzle 3 is adjustablely mounted on the lower end of the circular protrusion 12 through the mounting seat 13. The lower end of the striking pin 4, whose upper end is engaged with one end of the lever 8, passes through the circular protrusion 12 and impacts the nozzle 3.

[0027] The aforementioned fixing block 17 is formed by splicing together a first wedge block 18 and a second wedge block 19 that cooperate with each other. The inclined surface on the second wedge block 19, which is located above the first wedge block 18, slides in cooperation with the inclined surface on the first wedge block 18. A set screw 20 is embedded in the side wall of the valve body 22. The set screw 20 pushes and contacts the end face of the second wedge block 19 opposite to the end of the first wedge block 18. The lower surface of the first wedge block 18 presses against the upper end of the piezoelectric column 24. A second mounting groove 26 communicating with the receiving groove 21 is opened on the lower end surface of the valve body 22. The upper end of the connecting seat 5 is embedded in the second mounting groove 26.

[0028] The surfaces that mate with each other between the second protrusion 9 and the second groove 10, and between the first protrusion 241 and the first groove 242, are all arc surfaces; the second groove 10 is formed on the lower surface of the lever 8, and the second protrusion 9 is disposed on the inner wall of the receiving groove 21.

[0029] The first protrusion 241 is integrally formed on the upper surface of the lever 8, and the first groove 242 is formed on the lower end face of the piezoelectric column 24.

[0030] The glue supply block, nozzle, and connector are assembled into a complete flow channel assembly using bolts and other connectors. The flow channel assembly is then installed to the lower end of the valve body using the connector.

[0031] The glue enters the glue inlet channel on the glue supply block and then the glue outlet channel. The lower end of the ejector pin, which cooperates with the nozzle, penetrates the glue outlet channel. Through repeated impacts between the ejector 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 one end of the lever, causing the other end of the lever, which rotates around the second protrusion, to push the ejector pin downward to strike the nozzle and dispense glue. After the piezoelectric column is de-energized, it retracts, and the nested first and second return springs reset, allowing the ejector pin and the lever to return to their initial positions. The excitation voltage of the piezoelectric column is a square wave. Therefore, the ejector pin performs high-speed reciprocating motion under the action of the piezoelectric column, allowing the glue to be continuously sprayed from the nozzle.

[0032] Before initial debugging, the set screw is located at the outermost part of its stroke. When debugging begins, the set screw is turned into the valve body, causing the second wedge block to tend to move inward under the action of the set screw. Through the inclined surface between the second wedge block and the first wedge block, the force is transmitted to the first wedge block, causing the first wedge block to push the piezoelectric column downward until the lever, the first return spring, and the second return spring are all adjusted to a suitable and stable position. At this time, the fixed block of the set screw no longer moves, and the piezoelectric column, lever, first return spring, and second return spring are all in the best and most stable state.

[0033] When it is necessary to adjust the distance between the striker and the nozzle, the piezoelectric column, lever, and striker return spring all remain stationary. The distance between the striker and the nozzle is adjusted by adjusting the position of the mounting base and the nozzle located in the mounting base through the threaded adjustment.

[0034] When using the above-mentioned jet-type piezoelectric dispensing valve, the distance between the ejector pin and the nozzle can be adjusted by adjusting the nozzle position, without needing to adjust the ejector pin position via the piezoelectric column and lever. This ensures that the piezoelectric column, lever, and ejector pin's return spring remain stationary when adjusting the distance between the ejector pin and the nozzle, thereby improving the stability and force consistency of the piezoelectric column and return spring, and enhancing the dispensing accuracy and performance stability during long-term use. Furthermore, the fixing block is formed by splicing a first wedge block and a second wedge block that cooperate with each other. The inclined surface on the second wedge block, located above the first wedge block, slides in contact with the inclined surface on the first wedge block. A set screw is embedded in the side wall of the valve body, and the set screw pushes against the end face of the second wedge block opposite to the first wedge block. The lower surface of the first wedge block presses against the upper end of the piezoelectric column, providing space for initial debugging and allowing the return spring to be in a relatively relaxed state before debugging, thus reducing wear on the spring performance.

[0035] 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 jet-type piezoelectric dispensing valve, comprising: The valve body (22) with an internal receiving groove (21), the glue supply block (2) located on the lower outer side of the valve body (22) and having an internal glue flow channel (1), the nozzle (3), the striking pin (4) cooperating with the nozzle (3), the piezoelectric column (24) vertically arranged in the receiving groove (21), and the lever (8) rotatably connected between the lower end of the piezoelectric column (24) and the upper end of the striking pin (4), characterized in that: the glue supply block (2), the valve body (22) and the nozzle (3) are connected by a connecting seat (5), the connecting seat (5) has an inlet glue flow channel (6) and an outlet glue flow channel (7) that are interconnected, the end of the inlet glue flow channel (6) away from the outlet glue flow channel (7) is connected to the glue flow channel (1) on the glue supply block (2), and the lower end of the vertically extending outlet glue flow channel (7) away from the inlet glue flow channel (6) is connected to the nozzle (3); A first mounting groove (23) is provided inside the valve body (22) and directly above the piezoelectric column (24). The upper end of the piezoelectric column (24) is in abutting contact with the fixing block (17) provided in the first mounting groove (23). The lower end surface of the connecting seat (5) connected to the valve body (22) has a downwardly extending circular protrusion (12). The outer surface of the circular protrusion (12) is provided with an external thread, which is coaxially arranged with the glue outlet channel (7). A mounting seat (13) is fitted on the outer side of the circular protrusion (12) and is connected to the circular protrusion (12) by a thread. The nozzle (3) is adjustablely mounted on the lower end of the circular protrusion (12) through the mounting seat (13). The lower end of the striker (4), which is engaged with one end of the lever (8) at its upper end, passes through the circular protrusion (12) and impacts the nozzle (3).

2. The jet-type piezoelectric dispensing valve according to claim 1, characterized in that: The fixing block (17) is formed by splicing together a first wedge block (18) and a second wedge block (19) that cooperate with each other. The inclined surface on the second wedge block (19) located above the first wedge block (18) slides and cooperates with the inclined surface on the first wedge block (18). A set screw (20) is embedded in the side wall of the valve body (22). The set screw (20) and the end face of the second wedge block (19) opposite to the end of the first wedge block (18) push and contact each other. The lower surface of the first wedge block (18) is in contact with the upper end of the piezoelectric column (24).

3. The jet-type piezoelectric dispensing valve according to claim 1 or 2, characterized in that: A second mounting groove (26) communicating with the receiving groove (21) is provided on the lower end surface of the valve body (22), and the upper end of the connecting seat (5) is embedded in the second mounting groove (26).

4. The jet-type piezoelectric dispensing valve according to claim 1 or 2, characterized in that: The lever (8) is rotatably connected to the inner wall of the receiving groove (21) below it by a second protrusion (9) and a second groove (10) that cooperate with each other. The lower end of the piezoelectric column (24) is rotatably contacted with the lever (8) by a first protrusion (241) and a first groove (242) that cooperate with each other. The lower surface of the lever (8) near the end of the striker (4) has an arc-shaped protrusion (11) that contacts the upper end surface of the striker (4).

5. The jet-type piezoelectric dispensing valve according to claim 4, characterized in that: The firing pin (4) is slidably mounted between the lever (8) and the nozzle (3) via a guide sleeve (14), and a first return spring (15) is provided between the guide sleeve (14) and the upper end of the firing pin (4).

6. The jet-type piezoelectric dispensing valve according to claim 5, characterized in that: A second return spring (16) is provided between the lever (8) and the valve body (22).

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