Dual-piezoelectric injection valve and dispensing equipment

Abstract

The utility model is suitable for the technical field of dispensing, and provides a double-piezoelectric injection valve and dispensing equipment. The double-piezoelectric injection valve comprises a main shell, a glue outlet nozzle and a double-piezoelectric assembly, and the dispensing equipment comprises the double-piezoelectric injection valve. Compared with a piezoelectric injection valve in the prior art, in the working process, the control end of the glue outlet nozzle can be driven to move through the double piezoelectric assembly arranged in the main shell so that control over the glue outlet nozzle can be achieved, meanwhile, gas with the low temperature can be introduced into the containing space through the gas inlet connector so that the double piezoelectric assembly can be cooled, and therefore the glue outlet nozzle can be controlled, and the service life of the glue outlet nozzle can be prolonged. Therefore, precision reduction caused by temperature rise of the double-piezoelectric assembly is avoided, the dispensing control precision of the injection valve is better, and the dispensing quality is improved.

Description

Technical Field

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

[0002] A spray valve is a device used for spraying adhesives, specifically low-viscosity adhesives such as paint, silicone, and UV adhesives. It is widely used in machinery manufacturing, semiconductors, PCB (Printed Circuit Board) manufacturing, and SMT (Surface Mount Technology) manufacturing, for example, in mobile phone case coating, flux spraying, and surface coating. To ensure the spray valve's on / off response speed, piezoelectric components can be used to control the valve's opening and closing. Piezoelectric components utilize the piezoelectric and inverse piezoelectric effects of piezoelectric materials to convert electrical energy into mechanical energy. However, after prolonged use, existing piezoelectric spray valves experience a decrease in control accuracy due to the increased temperature of the piezoelectric material, which can cause deviations in the drive displacement of the piezoelectric component. This significantly affects the quality and precision of the dispensing process. Utility Model Content

[0003] The purpose of this invention is to provide a dual piezoelectric jet valve and dispensing equipment, which aims to solve the technical problem that the control accuracy of the existing piezoelectric jet valve is prone to decline after long-term operation.

[0004] This utility model is implemented as follows: Firstly, it provides a dual piezoelectric injection valve, comprising:

[0005] The main housing has an internal accommodating space. The main housing also has an air inlet and an exhaust outlet. Both the air inlet and the exhaust outlet are connected to the accommodating space. The air inlet is used to connect to an external low-temperature gas source, and the exhaust outlet is used to discharge the gas in the accommodating space.

[0006] A glue dispensing nozzle is disposed outside the main housing. The glue dispensing nozzle has a glue inlet and a spray outlet. The glue dispensing nozzle also has a control end, which is used to control the glue inlet and the spray outlet to be connected or disconnected. At least a portion of the control end extends into the interior of the receiving space.

[0007] A dual piezoelectric assembly is disposed within the receiving space and is used to drive the control end of the dispensing nozzle to move, thereby connecting or disconnecting the dispensing port and the spraying port on the dispensing nozzle.

[0008] In one optional embodiment, a first connector is provided at the air intake port for connecting the air intake port to an external pipeline, and a second connector is provided at the exhaust port for connecting the exhaust port to an external pipeline.

[0009] In an optional embodiment, the dual piezoelectric jet valve further includes a glue supply unit, the outlet of which is connected to the glue inlet, and a fixing structure is provided on the main housing, through which the glue supply unit is connected to the main housing.

[0010] In an optional embodiment, the fixing structure includes a snap-fit ​​component, a first end of which is connected to the main housing, and a second end of which extends away from the main housing. The snap-fit ​​component is provided with a snap-fit ​​groove for accommodating the glue supply unit.

[0011] In an optional embodiment, the first end of the mounting component is rotatably connected to the main housing, the main housing is provided with a snap-fit ​​assembly for fixing the dispensing nozzle, and at least a portion of the dispensing nozzle is rotatably connected to the snap-fit ​​assembly, and the rotation axis of the first end of the mounting component and the rotation axis of the dispensing nozzle are both located on the same straight line.

[0012] In an optional embodiment, the dual piezoelectric assembly includes a base, a drive lever, piezoelectric stacks, and a clamping member. The base has a mounting surface, and the drive lever is spaced apart from the mounting surface. The drive lever has a drive portion and a working portion, which are located at opposite ends of the drive lever. The working portion is used to connect to a control end of a dispensing nozzle to drive the control end to move when the drive lever moves. There are two piezoelectric stacks, each supported between the mounting surface and the drive portion, and spaced apart along the length of the drive lever. The piezoelectric stack is configured to change its height when the voltage applied to it changes, thereby driving the drive lever. The height changes of the two piezoelectric stacks are always in opposite directions. At least a portion of the clamping member is connected to the drive lever. The clamping member applies a force toward the piezoelectric stack to the drive lever to press the drive lever against the top region of the piezoelectric stack. The connection position between the clamping member and the drive lever is a first connection position, and the connection position between the piezoelectric stack and the drive lever is a second connection position. The first connection position is located between the two second connection positions.

[0013] In an optional embodiment, the dual piezoelectric assembly further includes two heat-conducting plates, which are located on opposite sides of the dual piezoelectric assembly and abut against the sides of the two piezoelectric stacks.

[0014] In an optional embodiment, the working part is provided with a pressure head for connecting to the control end of the dispensing nozzle, and an adjustment structure is provided between the pressure head and the working part, and the adjustment structure is used to adjust the relative position of the pressure head and the working part.

[0015] In an optional embodiment, a deflection structure is further provided between the piezoelectric stack and the drive lever and / or the base, and the piezoelectric stack can be deflected as a whole through the deflection structure when the height dimension of the piezoelectric stack changes.

[0016] In a second aspect, a dispensing device is provided, comprising the dual piezoelectric jet valves described in any of the preceding claims.

[0017] The technical advantages of this invention compared to existing technologies are as follows: By placing the dispensing nozzle outside the main housing and extending at least a portion of the nozzle control end into the receiving space on the main housing, a dual piezoelectric assembly is installed within the receiving space. This assembly drives the control end of the dispensing nozzle to move, thereby connecting or disconnecting the inlet and outlet of the nozzle. Simultaneously, the main housing also has an air inlet and an exhaust outlet. The air inlet can be connected to an external low-temperature gas source, and the exhaust outlet discharges gas from the receiving space. Compared to existing piezoelectric jet valves, this invention allows control of the dispensing nozzle during operation by driving the control end of the nozzle with the dual piezoelectric assembly within the main housing. Furthermore, the air inlet allows the introduction of low-temperature gas into the receiving space to cool the dual piezoelectric assembly, preventing a decrease in accuracy due to temperature increases. This results in better dispensing control accuracy and improved dispensing quality.

[0018] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the dual piezoelectric injection valve provided in this embodiment of the utility model;

[0021] Figure 2 This is a cross-sectional view of the dual piezoelectric injection valve provided in this embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the dual piezoelectric component used in this embodiment of the utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Main housing; 11. Accommodation space; 12. Air inlet; 13. Exhaust port; 2. Glue nozzle; 21. Control end; 22. Glue inlet; 23. Spray nozzle; 3. Glue supply unit; 4. Dual piezoelectric assembly; 41. Base; 411. Mounting surface; 42. Drive lever; 421. Drive unit; 422. Working unit; 43. Piezoelectric stacking unit; 44. Clamping component; 45. Pressing head; 46. Heat-conducting plate; 47. Position detection unit; 48. Deflection structure; 49. Elastic connector; 5. First connector; 6. Second connector; 7. Fixing structure; 71. Clip-on component; 72. Clip-on slot; 8. Snap-on assembly. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] Please refer to Figures 1 to 3 As shown, in a first aspect of this utility model embodiment, a dual piezoelectric injection valve is provided, including a main housing 1, a dispensing nozzle 2, and a dual piezoelectric assembly 4. The main housing 1 has an internal accommodating space 11, and also has an air inlet 12 and an exhaust 13, both of which are connected to the accommodating space 11. The air inlet 12 is used to connect to an external low-temperature gas source, and the exhaust 13 is used to discharge gas from the accommodating space 11. The dispensing nozzle 2 is disposed outside the main housing 1, and has an inlet 22 and an outlet 23. The dispensing nozzle 2 also has a control end 21, which is used to control the connection or disconnection of the inlet 22 and the outlet 23. At least a portion of the control end 21 extends into the interior of the accommodating space 11. The dual piezoelectric assembly 4 is disposed within the accommodating space 11 and is used to drive the control end 21 of the dispensing nozzle 2 to move, thereby connecting or disconnecting the inlet 22 and the outlet 23.

[0031] Specifically, the main housing 1 refers to a shell-like structure with a certain accommodating space 11, and the air inlet 12 and the exhaust port 13 both refer to opening structures provided on the main housing 1. The glue nozzle 2 refers to a component or assembly used for spraying glue. The glue nozzle 2 is provided with a glue inlet 22 and a spray port 23, and has a channel structure that connects the glue inlet 22 and the spray port 23. At the same time, a switching component is also provided in the channel structure. The switching component can be a striking pin, a stop block, or other components. At least a part of the switching component extends to the outside of the glue nozzle 2 to form a control end 21.

[0032] The dual piezoelectric component 4 refers to a device that uses the piezoelectric effect and inverse piezoelectric effect of piezoelectric materials to realize the mutual conversion between electrical energy and mechanical energy. Piezoelectric materials are materials that can generate voltage under external force or generate mechanical strain by applying voltage.

[0033] The dual piezoelectric injection valve provided in this embodiment of the invention features a dispensing nozzle 2 disposed outside the main housing 1, with at least a portion of the control end 21 of the dispensing nozzle 2 extending into the receiving space 11 on the main housing 1. A dual piezoelectric assembly 4 is also disposed within the receiving space 11, which can drive the control end 21 of the dispensing nozzle 2 to move, thereby connecting or disconnecting the glue inlet 22 and the injection port 23 on the dispensing nozzle 2. Simultaneously, an air inlet 12 and an exhaust 13 are also provided on the main housing 1, allowing the air inlet 12 to be connected to an external low-temperature gas source, and the exhaust 13 to discharge gas from the receiving space 11. Compared with existing piezoelectric jet valves, during operation, the control end 21 of the dispensing nozzle 2 can be driven to move by the dual piezoelectric components 4 set in the main housing 1, thereby controlling the dispensing nozzle 2. At the same time, a lower temperature gas can be introduced into the accommodating space 11 through the air inlet 12 to cool down the dual piezoelectric components 4, thereby avoiding the decrease in accuracy of the dual piezoelectric components 4 due to temperature rise, making the dispensing control accuracy of the jet valve better and improving the dispensing quality.

[0034] In one embodiment, see Figure 1 and Figure 2 The air intake port 12 is equipped with a first connector 5, which connects the air intake port 12 to an external pipeline. The exhaust port 13 is equipped with a second connector 6, which connects the exhaust port 13 to an external pipeline. Specifically, the first connector 5 is a component used to connect the pipeline to the container. During installation, one end of the first connector 5 can be connected to the air intake port 12 on the main housing 1 using methods such as threading, interference fit, or adhesive, while the other end can be inserted into the end of the pipeline. The second connector 6 is also a component used to connect the pipeline to the container. During installation, one end of the second connector 6 can be connected to the air intake port 12 on the main housing 1 using methods such as threading, interference fit, or adhesive, while the other end can be inserted into the end of the pipeline. The use of the first connector 5 and the second connector 6 makes the connection between the air intake port 12 and the exhaust port 13 and the pipeline more convenient, while also making the exhaust port 13 quieter and avoiding noise pollution.

[0035] In an optional embodiment, please refer to Figure 1 The first connector 5 and / or the second connector 6 can adopt a noise reduction structure to reduce the noise generated at the air intake port 12 and / or the exhaust port 13.

[0036] In one embodiment, see Figure 1 and Figure 2The dual piezoelectric injection valve also includes a glue supply unit 3. The outlet of the glue supply unit 3 is connected to the glue inlet 22. A fixing structure 7 is provided on the main housing 1, and the glue supply unit 3 is connected to the main housing 1 through the fixing structure 7. Specifically, the glue supply unit 3 refers to a component or assembly used to continuously supply glue. The glue supply unit 3 can be driven by a thread or pneumatic drive to move the glue. The fixing structure 7 refers to a component or assembly used to fix the position of an object. The fixing structure 7 can fix the object by snap-fit, pressing, or pasting. In this embodiment, by setting the glue supply unit 3, glue can be continuously supplied to the glue nozzle 2. At the same time, by connecting the glue supply unit 3 to the main housing 1 through the fixing structure 7, the installation of the glue supply unit 3 can be made more secure and stable, and the structure of the injection valve can be made more compact.

[0037] In one embodiment, see Figure 1 and Figure 2 The fixing structure 7 includes a mounting component 71. The first end of the mounting component 71 is connected to the main housing 1, and the second end of the mounting component 71 extends away from the main housing 1. The mounting component 71 is provided with a mounting groove 72 for accommodating the glue supply unit 3. Specifically, the mounting component 71 refers to a component with a certain volume. The mounting component 71 can be block-shaped, plate-shaped, or strip-shaped, or it can be a combination of various shapes. The mounting groove 72 refers to an accommodating structure with an opening. The shape of the mounting groove 72 can match the shape of the glue supply unit 3. When fixing the glue supply unit 3, it can be snapped into the mounting groove 72, making the installation of the glue supply unit 3 more convenient.

[0038] In one embodiment, see Figure 1 and Figure 2 The first end of the mounting component 71 is rotatably connected to the main housing 1. The main housing 1 is provided with a snap-fit ​​assembly 8 for fixing the dispensing nozzle 2, and at least a portion of the dispensing nozzle 2 is rotatably connected to the snap-fit ​​assembly 8. The rotation axis of the first end of the mounting component 71 and the rotation axis of the dispensing nozzle 2 are both located on the same straight line. Specifically, the snap-fit ​​assembly 8 is a device for connecting and fixing two or more components. By using the snap-fit ​​assembly 8 to fix the dispensing nozzle 2, the installation of the dispensing nozzle 2 can be made more secure and reliable, and the entire spray valve structure can be made more stable. Furthermore, at least a portion of the dispensing nozzle 2 is rotatably connected to the snap-fit ​​assembly 8, meaning that at least a portion of the dispensing nozzle 2 is partially grouted with the snap-fit ​​assembly 8. Then, a portion of the flat surface on the dispensing nozzle 2 is in contact with the flat surface on the snap-fit ​​assembly 8, and is pressed onto the snap-fit ​​assembly 8 by a nut on the dispensing nozzle 2. The snap-fit ​​assembly 8 and the nut are threadedly connected. The rotation axis of the first end of the mounting part 71 and the rotation axis of the dispensing nozzle 2 are both on the same straight line. The position of the dispensing unit 3 and the dispensing nozzle 2 can be adjusted by rotation according to production needs, thereby making the use of the entire spray valve more flexible and reliable.

[0039] In one embodiment, see Figure 2 and Figure 3 The dual piezoelectric assembly 4 includes a base 41, a drive lever 42, piezoelectric stacking parts 43, and a clamping member 44. The base 41 has a mounting surface 411. The drive lever 42 is spaced apart from the mounting surface 411. The drive lever 42 has a drive part 421 and a working part 422, located at opposite ends of the drive lever 42. The working part 422 is connected to the control end 21 of the dispensing nozzle 2 to drive the control end 21 when the drive lever 42 moves. There are two piezoelectric stacking parts 43, each supported between the mounting surface 411 and the drive part 421. The two piezoelectric stacking parts 43 move along the drive... The levers 42 are spaced apart along their length. The piezoelectric stacks 43 are used to change their height when the voltage applied to them changes, so as to drive the levers 42 to move. The height change directions of the two piezoelectric stacks 43 are always opposite. At least a portion of the clamping member 44 is connected to the drive lever 42. The clamping member 44 is used to apply a force toward the piezoelectric stacks 43 to the drive lever 42 to press the drive lever 42 against the top region of the piezoelectric stacks 43. The connection position between the clamping member 44 and the drive lever 42 is the first connection position, and the connection position between the piezoelectric stacks 43 and the drive lever 42 is the second connection position. The first connection position is located between the two second connection positions.

[0040] Specifically, base 41 refers to a supporting component with a certain volume, and base 41 can be block-shaped, plate-shaped, or a combination of various shapes. Mounting surface 411 refers to a surface structure with a certain area, and mounting surface 411 can be a planar structure. Drive lever 42 refers to a rigid component with a certain length, and the shape of drive lever 42 can be column-shaped, block-shaped, or strip-shaped. Drive lever 42 and mounting surface 411 are spaced apart from each other, and drive lever 42 is generally arranged in a direction parallel to mounting surface 411. Drive section 421 refers to the area on drive lever 42 near one end, and working section 422 refers to the area on drive lever 42 near the other end. Drive section 421 and working section 422 can be spaced apart or connected together. Clamping member 44 refers to a component with a certain volume, and clamping member 44 can be a single component, and its shape can be block-shaped, rod-shaped, or column-shaped. Clamping member 44 can also be a combination of various shapes. The clamping member 44 can be connected to the drive lever 42 at one end and to the base 41 at the other end. By applying a pulling force to the drive lever 42 through the clamping member 44, the drive lever 42 will be pressed against the piezoelectric stack 43, so that both the drive lever 42 and the piezoelectric stack 43 are fixed on the base 41.

[0041] The piezoelectric stack 43 refers to a structure composed of multiple piezoelectric material components stacked together. The overall shape of the piezoelectric stack 43 can be columnar, block-shaped, or rod-shaped. The ends of the piezoelectric stack 43 can be connected to the drive lever 42 or the base 41 by means of adhesion, abutment, or snap-fit. Piezoelectric material refers to a material that can generate voltage under external force or produce mechanical strain (e.g., dimensional change) by applying voltage. By stacking multiple piezoelectric material plates together and applying a certain initial voltage to the piezoelectric stack 43, the dimensions of each piezoelectric material plate will change after the voltage applied to the piezoelectric stack 43 changes. The sum of the deformations of the multiple piezoelectric material plates is the overall dimensional change of the piezoelectric stack 43. The height direction of the piezoelectric stack 43 refers to the direction of extension of the line connecting the base 41 and the drive lever 42 at the location of the piezoelectric stack 43.

[0042] When working, the same initial voltage is first applied to the two piezoelectric stacks 43. At this time, the working part 422 of the drive lever 42 is in the initial position. When the drive lever 42 needs to swing downward relative to the initial position, the voltage applied to the piezoelectric stack 43 farther from the working part 422 can be increased, and the voltage applied to the piezoelectric stack 43 closer to the working part 422 can be decreased. At this time, the height of the piezoelectric stack 43 farther from the working part 422 increases, and the height of the piezoelectric stack 43 closer to the working part 422 decreases. The first connection position is located between the two second connection positions. Therefore, the working part 422 of the drive lever 42 can swing downward with the first connection position as the axis. When the drive lever 42 needs to swing upward relative to the initial position, the voltage applied to the piezoelectric stack 43 farther from the working part 422 can be reduced, and the voltage applied to the piezoelectric stack 43 closer to the working part 422 can be increased. At this time, the height of the piezoelectric stack 43 farther from the working part 422 decreases, and the height of the piezoelectric stack 43 closer to the working part 422 increases. The first connection position is located between the two second connection positions. Therefore, the working part 422 of the drive lever 42 can swing upward with the first connection position as the axis, so that the working part 422 can control the dispensing nozzle 2.

[0043] Two piezoelectric stacked portions 43 are provided between the drive portion 421 of the drive lever 42 and the base 41, and the two piezoelectric stacked portions 43 are spaced apart along the length direction of the drive lever 42. At least a portion of a clamping member 44 is connected to the drive lever 42, and a force is applied to the drive lever 42 toward the piezoelectric stacked portions 43 to press the drive lever 42 against the piezoelectric stacked portions 43. The connection position between the clamping member 44 and the drive lever 42 is a first connection position, and the connection position between the piezoelectric stacked portions 43 and the drive lever 42 is a second connection position, with the first connection position located between the two second connection positions. Compared to the dual piezoelectric assembly 4 in the prior art, by providing two piezoelectric stacked portions 43 between the drive portion 421 of the drive lever 42 and the base 41, and by changing the voltage to simultaneously control the height of the two piezoelectric stacked portions 43 to adjust in opposite directions, the working portion 422 of the drive lever 42 is pushed up or down. Furthermore, since the contact position between the clamping member 44 and the drive lever 42 is constant, the height change of the two piezoelectric stacked parts 43 due to temperature rise after long-term operation will be limited by the clamping member 44. This prevents the error caused by temperature rise from being transmitted to the drive lever 42, making the movement of the working part 422 of the drive lever 42 more precise. In turn, the working part 422 can control the dispensing nozzle 2 more precisely, reducing the deviation of this dual piezoelectric assembly 4 in the control process and improving the quality and accuracy of dispensing.

[0044] In addition, the working pressure difference applied to the two piezoelectric stacks 43 and the frequency of pressure difference change can be kept consistent, so that the heating amplitude of the two piezoelectric stacks 43 is also consistent. At this time, the error caused by heating on the two piezoelectric stacks 43 will also cancel each other out, so that it will not be amplified by the swing of the drive lever 42, thereby effectively ensuring the accuracy of the displacement output at the working part 422 of the drive lever 42.

[0045] In one embodiment, see Figure 2 and Figure 3The clamping component 44 includes a clamping rod and a clamping cap. The first end of the clamping rod is movably connected to the base 41. The second end of the clamping rod passes through the drive lever 42 and extends to the side of the drive lever 42 away from the base 41. The clamping cap is disposed at the second end of the clamping rod and abuts against the side of the drive lever 42 away from the base 41. Specifically, the clamping rod refers to a rod-shaped component of a certain length, generally arranged along the height direction of the piezoelectric stack 43. The first end of the clamping rod can be movably connected to the base 41 via a threaded connection or other means. The second end of the clamping rod passes through the drive lever 42 and extends to the side of the drive lever 42 away from the base 41. The clamping cap is disposed at the second end of the clamping rod and abuts against the side of the drive lever 42 away from the base 41. By rotating the clamping rod, it can be moved along its own axis under the action of the thread, thereby causing the clamping cap to push the drive lever 42 towards the piezoelectric stack 43, thus making the installation and fixing of the drive lever 42 more convenient.

[0046] In an optional embodiment, please refer to Figure 2 and Figure 3 A positioning groove is also provided on the surface where the drive lever 42 contacts the two piezoelectric stacks 43. Specifically, the positioning groove refers to a groove structure with a certain depth. One end of the piezoelectric stack 43 can abut against the bottom surface of the positioning groove. The positioning groove can provide position indication for the installation of the piezoelectric stack 43 during assembly, thereby improving assembly efficiency and accuracy.

[0047] In addition, the drive lever 42 can be made of a material with high thermal conductivity, such as metal. By abutting the piezoelectric stack 43 against the drive lever 42, the heat generated by the piezoelectric stack 43 can be transferred to the drive lever 42, which can improve the heat dissipation performance of the drive lever 42 and the piezoelectric stack 43, and to a certain extent avoid the error caused by the temperature rise of the piezoelectric stack 43, thus improving the accuracy of the system.

[0048] In one embodiment, see Figure 2 and Figure 3 The dual piezoelectric assembly 4 also includes two heat-conducting plates 46, located on opposite sides of the assembly and abutting against the sides of the two piezoelectric stacks 43. Specifically, the heat-conducting plate 46 is a plate-shaped component with a certain area; it can be plate-shaped, block-shaped, etc. The heat-conducting plate 46 is typically made of a metal material with high thermal conductivity, and multiple heat dissipation fins can be provided on its surface. The heat-conducting plates 46 further enhance the heat dissipation capacity of the piezoelectric stacks 43.

[0049] In an optional embodiment, please refer to Figure 2 and Figure 3 A thermally conductive gel layer is also provided between the heat-conducting plate 46 and the side of the piezoelectric stack 43. Specifically, the thermally conductive gel layer refers to a viscous material with high thermal conductivity. By placing the thermally conductive gel between the heat-conducting plate 46 and the side of the piezoelectric stack 43, the heat conduction effect between the heat-conducting plate 46 and the side of the piezoelectric stack 43 is improved.

[0050] In one embodiment, see Figure 2 and Figure 3 The working part 422 is equipped with a pressure head 45 for connecting to the control end 21 of the dispensing nozzle 2. An adjustment structure is provided between the pressure head 45 and the working part 422 to adjust the relative position of the pressure head 45 and the working part 422. Specifically, the pressure head 45 refers to a component with a certain volume. The pressure head 45 can be connected to the control end 21 of the dispensing nozzle 2 by means of abutment, hinge, fastener, or snap-fit. The adjustment structure refers to a component or assembly that can adjust the distance between the two objects, and its function is to adjust the relative position of the pressure head 45 and the working part 422. By setting the pressure head 45 on the working part 422 to connect to the control end 21 of the dispensing nozzle 2, and by providing an adjustment structure between the pressure head 45 and the working part 422, the relative position between the pressure head 45 and the working part 422 can be adjusted before operation to ensure that the pressure head 45 is at the zero point position, thereby eliminating errors caused by manufacturing and assembly, and further ensuring the stability and accuracy of the displacement output at the working part 422.

[0051] In one embodiment, see Figures 2 to 3The adjusting structure includes a connecting rod and a locking element. At least a portion of the connecting rod is threadedly connected to the working part 422. A pressure head 45 is connected to the end of the connecting rod. The locking element is fitted onto the connecting rod and threadedly connected to it. The locking element is used to fix the connecting rod after adjustment. Specifically, the connecting rod refers to a rod-shaped component of a certain length. The threaded connection of at least a portion of the connecting rod to the working part 422 means that a mounting hole can be provided at the working part 422 of the drive lever 42. The mounting hole can be a blind hole or a through hole. At least a portion of the connecting rod is disposed in the mounting hole, and the connecting rod is threadedly connected to the inner wall of the mounting hole. The locking element refers to a component of a certain volume. The locking element can be columnar, block-shaped, etc. The locking element is provided with a mounting through hole, and the connecting rod passes through the mounting through hole to realize that the locking element is fitted onto the outside of the connecting rod. When the position of the pressure head 45 needs adjustment, the connecting rod can be rotated around its own axis. This allows the connecting rod to move relative to the working part 422 along its own axis under the action of the connecting rod thread. The pressure head 45 is connected to the end of the connecting rod, and when the connecting rod moves, it can drive the pressure head 45 to move together, thus adjusting the position of the pressure head 45. At the same time, a locking component is also fitted on the outside of the connecting rod, and the locking component is threadedly connected to the connecting rod. After the position of the connecting rod is adjusted, the locking component can be rotated to move along the axis of the connecting rod to abut against the drive lever 42, thereby fixing the position of the connecting rod and preventing the connecting rod from loosening during operation.

[0052] In an optional embodiment, please refer to Figures 2 to 3 The locking element is cylindrical, and its cross-sectional shape is polygonal, making it easier to rotate.

[0053] In one embodiment, see Figures 2 to 3 The dual piezoelectric assembly also includes a position detection unit 47, which is used to detect the position of the pressure head 45. Specifically, the position detection unit 47 is a component that can detect changes in the position of an object. The position detection unit 47 can be inductive, differential transformer, eddy current, Hall sensor, optical grating, magnetic grating, or other similar methods. By setting the position detection unit 47, the accuracy of the position of the pressure head 45 can be monitored in real time, further improving the accuracy of the displacement output.

[0054] In an optional embodiment, please refer to Figures 2 to 3The position detection unit 47 includes a sensed part and a sensor. The sensor is mounted on the base 41, and the sensed part can be mounted on the working part 422 of the drive lever 42 or on the pressure head 45. The sensor can be an inductive sensor, a differential transformer sensor, an eddy current sensor, a Hall sensor, a grating sensor, a magnetic grating sensor, etc. In this case, the sensed part can be a grating plate, a magnetic component, etc. Through the cooperation of the sensed part and the sensor, the position detection can be more accurate. The sensor can also be electrically connected to the control unit, and the control unit can also be connected to the voltage input terminal of the piezoelectric stack 43. The control unit can determine whether the deviation of the working part 422 is too large by receiving the data measured by the sensor, and adjust the voltage applied to the piezoelectric stack 43 accordingly based on the judgment result, thus realizing the closed loop of the entire control.

[0055] In addition, a support platform for mounting the sensor can be provided on the base 41. The support platform is set on the mounting surface 411 and protrudes from the mounting surface 411, making the installation of the sensor more convenient and secure.

[0056] In one embodiment, see Figures 2 to 3 A deflection structure 48 is also provided between the piezoelectric stack 43 and the drive lever 42 and / or the base 41, and the piezoelectric stack 43 can be deflected as a whole through the deflection structure 48 when the height of the piezoelectric stack 43 changes. Specifically, the deflection structure 48 refers to a component or part that can deflect an object relative to its original position through its own movement or deformation. The deflection structure 48 being provided between the piezoelectric stack 43 and the drive lever 42 and / or the base 41 includes the following cases: Case 1, the deflection structure 48 is provided between the piezoelectric stack 43 and the drive lever 42. Case 2, the deflection structure 48 is provided between the piezoelectric stack 43 and the base 41. Case 3, the deflection structure 48 is provided both between the piezoelectric stack 43 and the base 41 and between the piezoelectric stack 43 and the drive lever 42. By setting the deflection structure 48, when the drive lever 42 swings as a whole, the piezoelectric stack 43 can be offset as a whole through the deflection structure 48, thereby avoiding the bending of the piezoelectric stack 43 and affecting the height change of the piezoelectric stack 43, and further improving the accuracy of the displacement output of the working part 422 of the drive lever 42.

[0057] In one embodiment, see Figure 2 as well as Figure 3The deflection structure 48 includes a hinge portion and a rotation shaft. At least a portion of the hinge portion is connected to the piezoelectric stack portion 43, and the other portion of the hinge portion is connected to the rotation shaft. The rotation shaft is rotatably connected to the drive portion 421 or the base 41. Specifically, the hinge portion refers to a component with a certain volume, which can be block-shaped, plate-shaped, or cylindrical. The rotation shaft refers to a cylindrical component with a certain length. By abutting one end of the piezoelectric stack portion 43 against the hinge portion, and then rotatably connecting the hinge portion to the drive lever 42 or the base 41 via the rotation shaft, the piezoelectric stack portion 43 deflects about the axis of the rotation shaft.

[0058] Furthermore, the drive lever 42 or the base 41 may also be provided with a rotating structure for cooperating with the rotating shaft. The rotating structure may be a groove provided on the drive lever 42 or the base 41, with the rotating shaft rotatably disposed in the groove and rotatable relative to the inner wall of the groove. Alternatively, the rotating structure may be a sleeve connected to the drive lever 42 or the base 41, with at least a portion of the rotating shaft rotatably inserted into the sleeve.

[0059] In one embodiment, see Figure 1 The dual piezoelectric assembly also includes a stabilizing structure, which is located in the area between the drive lever 42 and the mounting surface 411. The stabilizing structure is used to maintain the stability of the movement of the drive lever 42. Specifically, the stabilizing structure refers to a component or assembly used to restrict the movement of an object to only one direction. By setting the stabilizing structure, the drive lever 42 can only move along or near the height of the piezoelectric stack 43, which can make the movement of the drive lever 42 more stable and improve the stability and accuracy of the displacement.

[0060] In one embodiment, see Figure 1 The stabilizing structure includes an elastic connector 49. The elastic connector 49 can elastically deform under stress, and it only has the degree of freedom to elastically deform along the height direction of the piezoelectric stack 43. One end of the elastic connector 49 is connected to the drive lever 42, and the other end is connected to the mounting surface 411. Specifically, the elastic connector 49 refers to a component with a certain degree of elasticity, and it only has the degree of freedom to elastically deform along the height direction of the piezoelectric stack 43. The elastic connector 49 can be an elastic sheet. By connecting one end of the elastic connector 49 to the drive lever 42 and the other end to the mounting surface 411, the drive lever 42 can only swing along or near the height direction of the piezoelectric stack 43 under the action of the elastic connector 49, preventing the drive lever 42 from deflecting in other directions during the swing process, thus making the swing of the drive lever 42 more stable and reliable.

[0061] Secondly, a dispensing device is provided, including the dual piezoelectric jet valve of any of the above-mentioned components. It is understood that the beneficial effects of the second aspect can be found in the relevant description in the first aspect above, and will not be repeated here.

[0062] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A dual piezoelectric injection valve characterized by, The utility model relates to a double piezoelectric injection valve, comprising: a main shell with an accommodating space inside, the main shell further having an air inlet interface and an air outlet interface, the air inlet interface and the air outlet interface both communicating with the accommodating space, the air inlet interface being used for communicating with an external low-temperature gas source, and the air outlet interface being used for discharging gas in the accommodating space; a glue outlet nozzle arranged outside the main shell, the glue outlet nozzle having a glue inlet and a jet port, the glue outlet nozzle further having a control end for controlling the glue inlet and the jet port to be connected or disconnected, at least part of the control end extending into the accommodating space; a double piezoelectric assembly arranged in the accommodating space for driving the control end of the glue outlet nozzle to move to realize the connection or disconnection of the glue inlet and the jet port on the glue outlet nozzle.

2. The bimorph jet valve of claim 1 wherein, The air inlet interface is provided with a first connector for connecting the air inlet interface with an external pipeline, and the air outlet interface is provided with a second connector for connecting the air outlet interface with an external pipeline.

3. The bimorph jet valve of claim 2 wherein, The double piezoelectric injection valve further comprises a glue supply unit, the outlet of the glue supply unit and the glue inlet being in communication with each other, the main shell being provided with a fixing structure, and the glue supply unit being connected to the main shell through the fixing structure.

4. The bimorph jet valve of claim 3 wherein, The fixing structure comprises a clamping piece, the first end of the clamping piece being connected to the main shell, the second end of the clamping piece extending away from the main shell, and the clamping piece being provided with a clamping groove for accommodating the glue supply unit.

5. The bimorph jet valve of claim 4 wherein, The first end of the clamping piece is rotationally connected to the main shell, the main shell is provided with a buckle assembly for fixing the glue outlet nozzle, at least part of the glue outlet nozzle is rotationally connected to the buckle assembly, and the rotation axis of the first end of the clamping piece and the rotation axis of the glue outlet nozzle are both located on the same straight line.

6. The bimorph jet valve according to any one of claims 1 to 5, wherein The double piezoelectric assembly comprises a base, a driving lever, piezoelectric stack parts, and a pressing piece, the base has a mounting surface, the driving lever is arranged in a spaced manner with the mounting surface, the driving lever has a driving part and a working part, the driving part and the working part are respectively located at the two ends of the driving lever, the working part is used for being connected with the control end of the glue outlet nozzle to drive the control end to move when the driving lever moves, the number of the piezoelectric stack parts is two, both the piezoelectric stack parts are supported between the mounting surface and the driving part, both the piezoelectric stack parts are arranged in a spaced manner along the length direction of the driving lever, the piezoelectric stack parts are used for changing the height thereof when the voltage applied thereon changes to push the driving lever to move, the height change directions of both the piezoelectric stack parts are always opposite, at least part of the pressing piece is connected to the driving lever, the pressing piece is used for applying force to the driving lever towards the piezoelectric stack parts to press the driving lever to the top area of the piezoelectric stack parts, and the connection position of the pressing piece and the driving lever is a first connection position, the connection position of the piezoelectric stack parts and the driving lever is a second connection position, and the first connection position is located between both the second connection positions.

7. The bimorph jet valve of claim 6 wherein, The bimorph piezoelectric assembly further comprises two heat-conducting plates, which are respectively arranged on two sides of the bimorph piezoelectric assembly and abut against the side surfaces of the two piezoelectric stack portions.

8. The bimorph jet valve of claim 7 wherein, The working portion is provided with a pressure head portion for being connected with a control end of a glue outlet nozzle, an adjusting structure is arranged between the pressure head portion and the working portion, and the adjusting structure is used for adjusting the relative position of the pressure head portion and the working portion.

9. The bimorph jet valve of claim 8 wherein, The piezoelectric stack portion is further provided with a deflection structure between the piezoelectric stack portion and the driving lever and / or the base, and the piezoelectric stack portion can be deflected as a whole through the deflection structure when the height dimension of the piezoelectric stack portion changes.

10. A dispensing apparatus, comprising: A bimorph piezoelectric injection valve comprising a bimorph piezoelectric stack portion according to any one of claims 1 to 9.

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