Dispensing device

Abstract

The utility model discloses a kind of glue dispensing devices, including glue dispensing valve body, driving assembly, temperature control assembly and glue dispensing execution component, glue dispensing valve body is equipped with glue inlet and glue outlet;Driving assembly is located on glue dispensing valve body;Temperature control assembly is thermally coupled with glue dispensing valve body, glue dispensing execution component is located in glue dispensing valve body, with driving assembly transmission connection, for glue body is quantitatively extruded from glue outlet under the drive of driving assembly;Temperature control assembly includes thermostat and heating part, heat conducting medium is filled in thermostat, heating part is used to heat heat conducting medium. Through the thermostat of filling heat conducting medium and heating part, the full domain uniform constant temperature control of glue body from glue inlet to glue outlet is realized, avoid the viscosity fluctuation and pipe blockage problem of glue body caused by local temperature deviation, guarantee the stable fluidity of high viscosity epoxy glue, improve glue dispensing quality.

Description

Technical Field

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

[0002] In the field of electronic packaging, especially in the packaging of high-power modules, as power modules develop towards higher power, they generate a large amount of heat when operating under high voltage and high current conditions, placing stringent requirements on the high-temperature resistance and insulation properties of the encapsulation sealants. Silicone-based sealants are no longer sufficient to meet the performance requirements of such scenarios, and epoxy resins have become an ideal alternative material due to their excellent high-temperature resistance and insulation properties.

[0003] However, epoxy adhesives are generally characterized by high viscosity and short working time, which places high demands on the dispensing accuracy and speed of epoxy dispensing equipment. Existing epoxy dispensing equipment mostly uses pneumatic or hydraulic drive to control dispensing, which has several technical drawbacks: Firstly, pneumatic valves, due to the compressibility of air, are prone to fluctuations in dispensing volume depending on the remaining adhesive in the cartridge and changes in adhesive viscosity. This can easily lead to uneven dispensing, stringing, and dripping problems in precision operations such as chip packaging. While hydraulic valves improve dispensing stability, their indirect pressure control mode is prone to pressure overshoot and delay at start-up and shutdown, resulting in poor consistency in adhesive dot size on precision pads and other small components, making it difficult to guarantee packaging yield.

[0004] On the other hand, traditional equipment often uses strip heaters for temperature control, which cannot achieve uniform temperature control of the colloid from storage to dispensing. High-viscosity epoxy colloids are prone to unstable flow due to uneven temperature during transmission and dispensing. This can cause excessive fluctuations in the width of the adhesive strip on components such as micro sensors, and can also easily lead to pipe blockage. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dispensing device that aims to solve the problem of dispensing high-viscosity epoxy adhesives.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a dispensing device, comprising: The dispensing valve body is equipped with an inlet and an outlet for dispensing. The drive assembly is located on the dispensing valve body; The temperature control component is thermally coupled to the dispensing valve body; A dispensing execution component is disposed in the dispensing valve body and is connected to the driving component for driving the adhesive to be quantitatively extruded from the dispensing port under the drive of the driving component. The temperature control component includes a constant temperature chamber and a heating element. The constant temperature chamber is filled with a heat-conducting medium, and the heating element is used to heat the heat-conducting medium.

[0007] Furthermore, the heat-conducting medium is heat-conducting oil.

[0008] Furthermore, the heating element is an electric heating coil arranged around the constant temperature chamber, and the constant temperature chamber is also provided with a temperature detection element for feedback control of the heating power of the electric heating coil.

[0009] Furthermore, the dispensing execution assembly includes a screw and a stator, and a propulsion cavity for propelling the flow of adhesive is formed between the screw and the stator, and the adhesive inlet and the adhesive outlet are connected to the propulsion cavity.

[0010] Furthermore, the stator is detachably connected to the dispensing valve body via a snap-fit ​​structure.

[0011] Furthermore, it also includes an adhesive inlet conduit, the outlet end of which is detachably connected to the adhesive inlet.

[0012] Furthermore, the glue inlet conduit is a double-layered tube, and heat-conducting oil or a heating wire is provided in the interlayer of the double-layered tube.

[0013] Furthermore, it also includes a mixing tank, which is connected to the inlet end of the glue inlet conduit.

[0014] Furthermore, both the glue inlet and the glue outlet are equipped with control valves.

[0015] Furthermore, the drive assembly includes a motor and a connecting rod, one end of which is connected to the motor, and the other end of which is connected to the screw.

[0016] The advantages of this invention compared to existing technologies are as follows: A dispensing device includes a dispensing valve body, a driving component, a temperature control component, and a dispensing execution component. The dispensing valve body has an inlet and an outlet. The driving component is mounted on the dispensing valve body. The temperature control component is thermally coupled to the dispensing valve body. The dispensing execution component is located within the dispensing valve body and is connected to the driving component for dispensing adhesive in a metered manner from the outlet under the drive of the driving component. The temperature control component includes a constant temperature chamber and a heating element. The constant temperature chamber is filled with a heat-conducting medium, and the heating element is used to heat the heat-conducting medium. By using a constant temperature chamber filled with a heat-conducting medium and a heating element, uniform constant temperature control of the adhesive is achieved throughout the entire dispensing process, avoiding viscosity fluctuations and pipe blockage caused by local temperature deviations. This ensures the stable flowability of high-viscosity epoxy adhesive and improves dispensing quality.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of a dispensing device provided for a specific embodiment of this utility model; Figure 2 This is a structural schematic diagram of a dispensing device from another perspective, provided for a specific embodiment of the present utility model; Figure 3 A perspective view of a dispensing device provided for a specific embodiment of this utility model; Figure 4 A cross-sectional view of a dispensing device provided for a specific embodiment of this utility model; Figure 5 A perspective view of a temperature control component provided in a specific embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of the driving component provided in a specific embodiment of the present utility model.

[0020] Figure Labels 1. Dispensing valve body; 11. Dispensing outlet; 12. Dispensing inlet; 2. Temperature control assembly; 21. Temperature control chamber; 22. Heating element; 3. Dispensing conduit; 4. Dispensing execution assembly; 41. Stator; 42. Screw; 5. Drive assembly; 51. Motor; 52. Connecting rod; 100. Propulsion chamber. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] In the field of electronic packaging, especially in the packaging of high-power modules, as power modules develop towards higher power, they generate a large amount of heat when operating under high voltage and high current conditions, placing stringent requirements on the high-temperature resistance and insulation properties of the encapsulation sealants. Silicone-based sealants are no longer sufficient to meet the performance requirements of such scenarios, and epoxy resins have become an ideal alternative material due to their excellent high-temperature resistance and insulation properties.

[0028] However, epoxy adhesives are generally characterized by high viscosity and short working time, which places high demands on the dispensing accuracy and speed of epoxy dispensing equipment. Existing epoxy dispensing equipment mostly uses pneumatic or hydraulic drive to control dispensing, which has several technical drawbacks: Firstly, pneumatic valves, due to the compressibility of air, are prone to fluctuations in dispensing volume depending on the remaining adhesive in the cartridge and changes in adhesive viscosity. This can easily lead to uneven dispensing, stringing, and dripping problems in precision operations such as chip packaging. While hydraulic valves improve dispensing stability, their indirect pressure control mode is prone to pressure overshoot and delay at start-up and shutdown, resulting in poor consistency in adhesive dot size on precision pads and other small components, making it difficult to guarantee packaging yield.

[0029] On the other hand, traditional equipment often uses strip heaters for temperature control, which cannot achieve uniform temperature control of the colloid from storage to dispensing. High-viscosity epoxy colloids are prone to unstable flow due to uneven temperature during transmission and dispensing. This can cause excessive fluctuations in the width of the adhesive strip on components such as micro sensors, and can also easily lead to pipe blockage.

[0030] To address the aforementioned technical problems, this utility model was proposed, and will be described below through specific embodiments.

[0031] like Figures 1 to 6As shown, this utility model embodiment provides a dispensing device, including a dispensing valve body 1, a driving component 5, a temperature control component 2, and a dispensing execution component 4. The dispensing valve body 1 is provided with an inlet 12 and an outlet 11. The driving component 5 is disposed on the dispensing valve body 1. The temperature control component 2 is thermally coupled to the dispensing valve body 1. The dispensing execution component 4 is disposed inside the dispensing valve body 1 and is connected to the driving component 5 for transmission, and is used to quantitatively extrude the adhesive from the outlet 11 under the drive of the driving component 5. The temperature control component 2 includes a constant temperature chamber 21 and a heating element 22. The constant temperature chamber 21 is filled with a heat-conducting medium, and the heating element 22 is used to heat the heat-conducting medium.

[0032] Specifically, on the side wall of the dispensing valve body 1, an inlet 12 and an outlet 11 are respectively provided along its height direction. The inlet 12 is located on the lower side wall of the valve body and is used to introduce the externally prepared adhesive into the dispensing valve body 1. The outlet 11 is located at the center of the bottom end face of the dispensing valve body 1. Its port is narrowed inward to form a conical guide structure. This structure can gather and shape the adhesive that is about to be extruded, and prevent the adhesive from spreading or stringing when it is dispensing. To achieve precise control over the flow path of the adhesive, independent control valves are embedded at both the inlet 12 and the outlet 11. These control valves are electromagnetically driven shut-off valves, with their valve stems fixedly connected to the sealing valve core inside the valve body. The valve core can be quickly opened and closed by an electrical signal sent from an external control circuit. The opening degree of the valve core can be adjusted in multiple levels according to actual dispensing needs to adapt to different adhesive flow requirements. At the same time, when the dispensing operation is paused or ended, the flow of adhesive can be immediately cut off by closing the control valve to prevent dripping or leakage.

[0033] The drive assembly 5 is fixedly installed inside the dispensing valve body 1. Its core function is to provide a stable and controllable power output for the dispensing execution assembly 4 in order to achieve quantitative extrusion of the adhesive.

[0034] The temperature control component 2 is thermally coupled to the dispensing valve body 1. Its core function is to provide a uniform and stable temperature environment for the adhesive within the dispensing valve body 1, thereby maintaining the viscosity stability of the adhesive and ensuring smooth dispensing of high-viscosity epoxy adhesive. Specifically, the temperature control component 2 includes a constant temperature chamber 21 and a heating element 22. The constant temperature chamber 21 is a hollow, sealed cavity structure adapted to the shape of the dispensing valve body 1, and is entirely fitted onto the outside of the dispensing valve body 1. The constant temperature chamber 21 is filled with a heat-conducting medium, preferably a high-boiling-point, high-heat-capacity special heat-conducting oil. This heat-conducting oil can form a fully connected heat reservoir within the constant temperature chamber 21, achieving uniform heating of the valve body. The heating element 22 converts electrical energy into heat energy and transfers it to the walls of the constant temperature chamber 21, which then conducts it to the internal heat-conducting medium, achieving uniform heating of the heat-conducting medium.

[0035] The dispensing execution component 4 is located in the core area of ​​the dispensing valve body 1. It is connected to the drive component 5 and is the core execution component for realizing quantitative extrusion of the colloid.

[0036] The constant temperature chamber 21 filled with heat-conducting medium and the heating element 22 achieve uniform constant temperature control of the colloid from injection to dispensing, avoiding viscosity fluctuations and pipe blockage caused by local temperature deviations, ensuring stable flowability of high-viscosity epoxy adhesive and improving dispensing quality.

[0037] Specifically, a high-boiling-point, high-heat-capacity, and low-volatility synthetic thermal oil can be selected. This type of thermal oil possesses excellent thermal stability and can maintain stable physicochemical properties under long-term high-temperature conditions, without problems such as easy volatility, carbonization, or coking. It can effectively ensure the long-term reliable operation of the temperature control component 2. At the same time, its high thermal conductivity ensures rapid heat transfer and uniform distribution, making it suitable for the stringent temperature control requirements of high-viscosity epoxy adhesive dispensing operations. Mineral-based thermal oils can also be selected. Mineral-based thermal oils have the advantages of low cost and easy procurement. They also possess a certain degree of thermal stability and thermal conductivity, which can meet the dispensing conditions with relatively moderate temperature control accuracy requirements.

[0038] In some embodiments, a dispensing component can be provided at the dispensing position of the dispensing valve body 1. The dispensing component is designed with a dispensing port 11 and is detachably connected to the dispensing valve body 1 by threads, which facilitates the replacement of the dispensing component after dispensing and is beneficial for cleaning and maintenance of the equipment.

[0039] In some embodiments, the heating element 22 is an electric heating coil arranged around the constant temperature chamber 21. The electric heating coil, as the core heating element of the temperature control component 2, is spirally and tightly wound inside the constant temperature chamber 21. This electric heating coil can be made of nickel-chromium alloy wire. Nickel-chromium alloy has stable resistivity, high temperature resistance, and strong oxidation resistance, and can maintain stable heating performance under long-term high-temperature conditions. It will not experience heating power attenuation or open-circuit failure due to oxidation or aging, effectively ensuring the long-term reliable operation of the temperature control component 2. The wire diameter of the electric heating coil is adapted according to the volume of the constant temperature chamber 21, the heat capacity of the heat transfer oil, and the target heating rate to ensure that it can output sufficient heat to meet the heating and constant temperature maintenance requirements of the heat transfer oil.

[0040] During installation, a spiral groove is pre-cut into the inner wall of the constant temperature chamber 21. The depth and width of the groove are slightly larger than the diameter of the heating coil wire. The heating coil can be embedded and clamped into the groove, thus achieving a tight fit with the outer wall of the constant temperature chamber 21. This avoids heat conduction loss caused by gaps between the coil and the chamber. Simultaneously, the groove's limiting function prevents the heating coil from shifting or loosening during long-term use. To further enhance heat conduction efficiency, a layer of high thermal conductivity thermal grease can be coated onto the inner wall of the groove. This grease fills the tiny gaps between the coil and the groove, significantly increasing the rate of heat transfer from the heating coil to the constant temperature chamber 21. Both ends of the heating coil extend to the top of the constant temperature chamber 21 and are fixed by high-temperature resistant insulating terminals. The outer side of the terminals is covered with a ceramic insulating sleeve to prevent the coil end from contacting external metal parts and causing a short circuit. The coil leads are connected to the external temperature control drive circuit through high-temperature resistant wires, which are also covered with a fireproof insulating layer to ensure the safety of the power supply process.

[0041] In addition, to achieve multi-level adjustment of heating power, the heating coil can adopt a segmented winding design, which can be divided into at least two independent heating sections. The lead wires of each heating section are connected to different power output terminals of the temperature control drive circuit. The temperature control circuit can control the on and off of one or more heating sections according to the actual temperature control requirements, thereby realizing the step-by-step adjustment of heating power and adapting to the temperature control requirements of different temperature ranges.

[0042] The constant temperature chamber 21 is also equipped with a temperature sensing element, the core function of which is to collect the temperature data of the heat transfer oil inside the constant temperature chamber 21 in real time and feed the data back to the temperature control system to realize closed-loop control of the heating coil. The temperature sensing element can preferably be a type K thermocouple. Type K thermocouples have the characteristics of wide temperature measurement range, fast response speed and high measurement accuracy, and can be accurately adapted to the temperature control range of the heat transfer oil.

[0043] Multiple thermocouple detection terminals are evenly embedded in the inner wall of the constant temperature chamber 21 along its height and circumference. Specifically, at least one detection terminal is arranged in the upper, middle, and lower parts of the constant temperature chamber 21, and the detection terminals at each height level are evenly distributed circumferentially, forming a multi-point, all-round temperature monitoring network. The upper detection terminal can monitor the temperature of the surface layer of the heat transfer oil, the middle detection terminal corresponds to the temperature of the heat transfer oil in the core temperature control area of ​​the dispensing valve body 1, and the lower detection terminal monitors the temperature of the heat transfer oil at the bottom of the constant temperature chamber 21. Multi-point monitoring can effectively avoid temperature control inaccuracies caused by data deviations from a single detection point, ensuring that the collected temperature data can truly reflect the overall temperature state of the heat transfer oil inside the constant temperature chamber 21.

[0044] The thermocouple's sensing end is fixed to the inner wall of the constant temperature chamber 21 via a high-temperature resistant ceramic sheath. The sheath isolates the thermocouple from the corrosion caused by the heat transfer oil, while ensuring full contact between the sensing end and the heat transfer oil. The thermocouple's compensating wire extends to the outside through a sealed wire hole at the top of the constant temperature chamber 21. The wire hole is filled with high-temperature resistant sealant, which ensures the airtightness of the constant temperature chamber 21, preventing heat transfer oil leakage, and also secures the compensating wire, preventing it from breaking due to external pulling. The compensating wire connects to the signal acquisition module of the temperature control system. This module converts the thermocouple's thermoelectric potential signal into a digital temperature signal, providing accurate data support for subsequent feedback control.

[0045] K-type thermocouples at various locations collect real-time temperature data of the heat transfer oil in different areas within the constant temperature chamber 21. The thermoelectric potential signal is transmitted to the signal acquisition module of the temperature controller via compensating wires. The acquisition module filters and amplifies the multiple signals, converting them into corresponding digital temperature values. The data processing module averages these digital temperature values ​​to obtain the average temperature of the heat transfer oil within the constant temperature chamber 21. This average temperature value is then compared to a preset target temperature value to calculate the temperature deviation. If the average temperature value is lower than the target temperature value, it is determined that the heating power needs to be increased; if the average temperature value is higher than the target temperature value, it is determined that the heating power needs to be reduced or cut off; if the deviation between the average temperature value and the target temperature value is within the allowable range, the current heating power is maintained. The power drive module precisely adjusts the power supply to the heating coil based on the judgment results from the data processing module. When increased power is required, the drive module can control the circuits of more segmented heating sections to be connected, or increase the supply voltage and supply current to improve the overall heating power. When decreased power is required, the drive module can cut off the circuits of some heating sections, or reduce the supply voltage and supply current. When the temperature reaches the target value, the drive module can control the heating coil to maintain extremely low power, or enter an intermittent power supply mode, that is, briefly power on for heating and then power off, and power on again when the temperature drops slightly, so as to achieve precise and constant temperature.

[0046] To reduce heat loss within the constant temperature chamber 21, lower the energy consumption of the heating coil, and ensure the operational efficiency of the temperature control system, a multi-layered thermal insulation structure can be applied to the outside of the constant temperature chamber 21. The inner layer is made of aluminum silicate refractory fiber cotton, which has the characteristics of high temperature resistance and extremely low thermal conductivity, effectively blocking heat conduction from the constant temperature chamber 21 to the outside. The outer layer is made of rigid polyurethane insulation board, which not only further enhances the insulation effect but also protects the internal fiber cotton, preventing it from deforming or falling off due to external pressure.

[0047] Through uniform heating by a surrounding electric heating coil, full-area monitoring by multi-point temperature detection elements, and intelligent closed-loop power feedback control, the temperature of the heat transfer oil inside the constant temperature chamber 21 is precisely regulated. The temperature fluctuation range can be controlled within a very small range, which can provide a stable constant temperature environment for high-viscosity epoxy adhesives and ensure that the viscosity of the adhesive remains consistent throughout the entire dispensing process. This completely solves the problems of poor dispensing and uneven adhesive dot size caused by temperature fluctuations.

[0048] exist Figure 4 In the embodiment shown, the dispensing execution component 4 includes a screw 42 and a stator 41. A propulsion cavity 100 for pushing the adhesive flow is formed between the screw 42 and the stator 41. The adhesive inlet 12 and the adhesive outlet 11 are connected to the propulsion cavity 100.

[0049] The stator 41, serving as the fixed base component of the dispensing actuator 4, has an overall cylindrical cavity structure. It can be integrally molded from a high-strength, high-wear-resistant engineering ceramic material. This material not only possesses excellent structural rigidity, capable of withstanding the extrusion and friction forces during the rotation of the screw 42, but also effectively avoids wear and corrosion problems that occur after long-term contact with the adhesive, ensuring the service life and operational stability of the stator 41. The inner wall of the stator 41 is machined to form continuous and uniform spiral guide grooves. The pitch, depth, and spiral angle of the guide grooves are designed as needed, allowing for perfect meshing with the assembled screw 42, providing a guiding foundation for the stable propulsion of the adhesive.

[0050] The stator 41 has an inlet and an outlet interface at its two axial ends. The inlet interface is aligned with and connected to the inlet 12 on the dispensing valve body 1, while the outlet interface is coaxially connected to the outlet 11 of the dispensing valve body 1, ensuring that the adhesive can smoothly enter the stator 41 from the inlet 12, be pushed by the push chamber 100, and be stably extruded from the outlet 11.

[0051] The screw 42 is the core power propulsion component of the dispensing execution assembly 4. It is made of high-strength stainless steel and precision CNC machined. The outer wall of the screw 42 is provided with helical blades that are perfectly adapted to the guide grooves on the inner wall of the stator 41. The pitch and height of the blades correspond one-to-one with the guide grooves, ensuring that after the screw 42 is inserted into the stator 41, the blades can be completely embedded in the guide grooves, forming a closed and continuous propulsion cavity 100. The volume of the propulsion cavity 100 varies uniformly along the axial direction of the screw 42, providing a structural basis for the quantitative propulsion of the colloid. The top end of the screw 42 is connected to the drive assembly 5 for transmission.

[0052] The bottom end of the screw 42 can be designed as a smooth, tapered guide head. This guide head can gather and guide the adhesive being pushed to the dispensing interface, preventing the adhesive from stagnating or accumulating before dispensing, and reducing adhesive residue at the end of the screw 42, thus reducing cleaning difficulty. The overall length of the screw 42 matches the axial length of the stator 41, ensuring that the helical blades of the screw 42 can completely cover the guide grooves on the inner wall of the stator 41, forming a complete adhesive delivery path in the propulsion chamber 100. In addition, a smooth and wear-resistant protective layer can be designed on the surface of the screw 42, which reduces the adhesion between the adhesive and the surface of the screw 42, reduces adhesive residue, improves the wear resistance of the screw 42, and extends its service life.

[0053] In terms of transmission, the drive assembly 5 drives the screw 42 to rotate at a constant speed. Since the spiral blades of the screw 42 are engaged with the guide groove of the stator 41, the rotation of the screw 42 can be converted into an axial thrust force on the colloid in the propulsion chamber 100. The magnitude and direction of this thrust force can be precisely controlled by the drive assembly 5 to achieve on-demand extrusion of the colloid.

[0054] The push chamber 100 can generate continuous extrusion pressure during the colloid push process. Combined with the stable temperature environment maintained by the temperature control component 2, it can effectively reduce the flow resistance of high viscosity epoxy colloid, ensure that the colloid flows smoothly from the inlet to the outlet, and avoid the problems of tube blockage and stringing that are easy to occur in traditional dispensing execution components 4.

[0055] In some embodiments, the stator 41 is detachably connected to the dispensing valve body 1 via a snap-fit ​​structure.

[0056] Specifically, the stator 41 is a cylindrical structure with at least three sets of snap-fit ​​units evenly distributed along its outer wall in the circumferential direction. Each set of snap-fit ​​units is distributed at equal intervals to ensure the uniformity of force after the stator 41 is connected to the dispensing valve body 1, and to avoid the stator 41 shifting due to force on one side. Each set of latching units includes an elastic latch, a limiting boss, and an unlocking pressing part. The elastic latch is an L-shaped sheet structure, with one end integrally fixed to the outer wall of the stator 41, and the other end extending away from the axis of the stator 41 and slightly protruding outward. The free end face of the latch has an arc-shaped guide slope. This guide slope can form a sliding fit with the edge of the valve body side slot unit during the process of inserting the stator 41 into the dispensing valve body 1, guiding the elastic latch to produce inward elastic deformation, so that the latch can slide smoothly into the slot. The limiting boss is located at the connection root between the elastic latch and the outer wall of the stator 41. Its radial dimension is larger than the width of the elastic latch, which can limit the elastic deformation range of the elastic latch and prevent the latch from breaking due to excessive deformation. The unlocking pressing part is a protruding pressing block located on the outside of the elastic latch, which allows the operator to apply pressing pressure with a special tool or fingers to drive the elastic latch to deform inward to disengage from the slot, thereby unlocking and disassembling the stator 41.

[0057] The inner wall of the dispensing valve body 1, corresponding to the position of the stator 41, has slotted units in the same number and position as the snap-fit ​​units. Each slotted unit includes a guide groove, a snap-fit ​​limiting groove, and an anti-detachment stop. The guide groove is an elongated groove along the axial direction of the dispensing valve body 1. Its width is slightly larger than the width of the elastic snap tongue, and its depth is adapted to the protrusion height of the elastic snap tongue. When the stator 41 is installed into the dispensing valve body 1, the elastic snap tongue can slide smoothly into the guide groove, providing axial guidance. The snap-fit ​​limiting groove is a transverse groove at the bottom of the guide groove, which is L-shaped and connected to the guide groove. When the elastic snap tongue slides to the bottom of the guide groove with the stator 41, rotating the stator 41 will allow the elastic snap tongue to engage. The latch slides into the locking groove, at which point the elastic deformation of the latch returns to its original state, and the free end of the latch engages in the groove of the locking groove, forming a double axial and circumferential limiting. The anti-detachment stop is a raised edge located on the side of the locking groove away from the guide slide, and its height is slightly higher than the groove depth of the locking groove. It can form a circumferential block on the elastic latch, preventing the stator 41 from rotating circumferentially due to vibration during the dispensing operation, which would cause the elastic latch to detach from the locking groove, and further enhance the stability of the connection.

[0058] When assembling the stator 41, first align the axial direction of the stator 41 with the axial direction of the dispensing valve body 1, so that the elastic latches on the side of the stator 41 are aligned with the guide grooves of the inner wall slot unit of the dispensing valve body 1; then push the stator 41 axially into the dispensing valve body 1. During the pushing process, the arc-shaped guide slope of the elastic latches contacts the edge of the guide groove, and under the action of the extrusion force, it produces an inward elastic deformation, allowing the latches to smoothly enter the guide groove and slide along the groove; when the elastic latches slide to the bottom of the guide groove, the operator can rotate the stator 41 circumferentially, driving the elastic latches to move into the groove. The elastic latch slides into the locking groove, at which point the elastic latch loses its squeezing force and quickly resets, its free end locking into the locking groove of the locking groove, and simultaneously abutting against the anti-disengagement stop, completing the initial locking of the stator 41; finally, check the locking status of each latching unit to ensure that all elastic latches are stably locked into the corresponding locking groove. At this time, the stator 41 and the dispensing valve body 1 are firmly connected, and the glue inlet interface of the stator 41 is precisely aligned with the glue inlet 12 of the dispensing valve body 1, and the glue outlet interface is coaxially connected with the glue outlet 11, ensuring the smooth flow path of the glue.

[0059] When the stator 41 needs to be disassembled for maintenance or replacement, firstly, use a special tool (such as a small pressing rod) to align with the unlocking pressing part of each latching unit and apply inward pressing force. This drives the elastic latch to overcome its own elasticity and deform inward, causing the free end of the latch to disengage from the locking groove. Then, rotate the stator 41 circumferentially in the opposite direction, causing the elastic latch to slide back from the locking groove into the guide groove. Finally, pull the stator 41 outward axially, causing the elastic latch to slide out of the dispensing valve body 1 along the guide groove, thus completing the disassembly of the stator 41. The entire disassembly and assembly process does not require complex disassembly and assembly equipment and can be completed with only simple tools, significantly reducing equipment maintenance downtime.

[0060] The stator 41 and the dispensing valve body 1 are detachably connected by a snap-fit ​​structure, which facilitates cleaning after dispensing.

[0061] exist Figure 4 In the illustrated embodiment, the dispensing device further includes a glue inlet conduit 3, which is a hollow tubular structure. Its length can be customized according to the layout requirements of the actual production scenario. Its inlet end is equipped with a flared connector for sealing connection with the outlet of an external mixing tank or colloid storage device, ensuring stable introduction of the colloid into the conduit.

[0062] In addition, multiple pipe clamp fixing seats can be arranged at intervals on the outer wall of the glue inlet conduit 3. The conduit can be fixed to the support of the production equipment by the pipe clamps to prevent the conduit from shaking or bending due to its own weight or the impact of the glue flow, thus ensuring the stability of the glue delivery path.

[0063] The outlet end of the glue inlet conduit 3 is detachably connected to the glue inlet 12. Specifically, the outlet end of the glue inlet conduit 3 has an integrally formed connecting joint. The outer wall of the connecting joint is machined with multi-start trapezoidal external threads, and the end face of the connecting joint has an annular sealing groove for embedding a sealing gasket. At the same time, the outer wall of the connecting joint near the end has an annular protruding clamp limiting platform to provide positioning support for the quick-installation clamp. The glue inlet 12 of the dispensing valve body 1 extends outward with a tubular structure. Its inner wall is machined with multi-start trapezoidal internal threads that are compatible with the connecting joint of the glue inlet conduit 3, and can be screwed into the external threads of the connecting joint of the glue inlet conduit 3. The outer wall of this tubular structure also has an annular clamp limiting platform, which forms a symmetrical fit with the limiting platform of the connecting joint of the glue inlet conduit 3, providing bidirectional limiting for the quick-installation clamp. The interior of this tubular structure has a guide channel communicating with the glue inlet 12.

[0064] In some embodiments, the glue inlet conduit 3 is a coaxially nested double-layer tube, consisting of an inner delivery tube and an outer protective tube. The two are coaxially arranged and maintain a fixed distance to form a closed interlayer, which provides space for the containment of temperature control medium or the arrangement of temperature control elements.

[0065] Specifically, the inner delivery tube, serving as the core channel for colloid delivery, can be made of stainless steel through precision cold drawing. Both ends of the inner delivery tube extend to the outside of the outer protective tube, forming connection points for connecting external mixing equipment and the inlet 12 of the dispensing valve body 1. The outer protective tube is fitted over the inner delivery tube and is made of high-strength, high-temperature resistant fiberglass or stainless steel. Both ends of the outer protective tube are sealed to the outer wall of the inner delivery tube via high-temperature resistant sealing flanges, ensuring the airtightness of the interlayer. An annular interlayer exists between the inner delivery tube and the outer protective tube, within which heat-conducting oil circulates or a heating wire is installed.

[0066] When the adhesive inlet conduit 3 adopts the temperature control method of internal circulation of heat transfer oil in the jacket, a heat transfer oil circulation system needs to be set up. This system and the conduit jacket together form a closed-loop temperature control circuit to achieve uniform and constant temperature control of the adhesive in the pipe.

[0067] When the adhesive inlet conduit 3 employs a temperature control method with heating wires embedded within a jacket, its core function is to actively heat and maintain the constant temperature of the adhesive within the conduit through the electrothermal conversion of the heating wires. The heating wires can be spiral-shaped and made of nickel-chromium alloy, which possess stable resistivity, high temperature resistance, and strong oxidation resistance, maintaining stable heating performance under long-term high-temperature conditions. The heating wires are wound with a uniform pitch along the axial direction of the inner delivery tube, and a high thermal conductivity insulating pad is placed between the heating wires and the outer wall of the inner delivery tube. This ensures rapid heat conduction and prevents short-circuit faults caused by contact between the heating wires and the metal tube wall. The total power of the heating wires is matched according to the length and diameter of the conduit and the temperature control requirements of the adhesive to ensure sufficient heat output for constant temperature control of the adhesive.

[0068] In addition, multiple patch temperature sensors are evenly distributed along the axial direction of the conduit within the interlayer. The patch temperature sensors are tightly attached to the outer wall of the inner delivery tube, which can collect tube wall temperature data in real time and thus provide feedback on the temperature status of the colloid inside the tube.

[0069] The temperature control design of the double-layer tube body avoids the problem of heat loss and viscosity increase of the adhesive during the delivery of the adhesive through the inlet tube 3. It ensures the stable flow of high-viscosity epoxy adhesive from the inlet tube 3 to the dispensing valve 1, and avoids malfunctions such as tube blockage and poor dispensing caused by temperature fluctuations, laying a solid foundation for subsequent accurate dispensing.

[0070] In some embodiments, the dispensing device further includes a mixing tank connected to the inlet end of the dispensing conduit 3. This minimizes the adhesive transfer process after mixing, ensuring the viscosity and stability of the dispensed adhesive.

[0071] exist Figure 4 In the embodiment shown, the drive assembly 5 includes a motor 51 and a connecting rod 52. One end of the connecting rod 52 is connected to the motor 51, and the other end of the connecting rod 52 is connected to the screw 42.

[0072] Specifically, motor 51 is preferably a high-response, high-torque AC servo motor. This type of motor 51 has the characteristics of precise closed-loop speed control, stable torque output, and rapid start-stop response. It can achieve micron-level control of rotation angle and speed through pulse signals sent by an external CNC system, which fully matches the power precision requirements of screw 42 for propulsing colloid.

[0073] A receiving cavity is formed inside the dispensing valve body 1, and the motor 51 is placed in the receiving cavity. The output shaft of the motor 51 extends downward in the vertical direction, and its end is machined with a standardized spline interface, which is used to achieve a transmission connection with the connecting rod 52. The connecting rod 52 serves as the power transmission intermediary between the motor 51 and the screw 42. One end of the connecting rod 52 is machined with a spline groove that matches the spline interface of the output shaft of the motor 51. The tooth profile and tooth pitch of the spline groove are perfectly matched with the spline of the output shaft of the motor 51. The two achieve reliable transmission of circumferential torque through spline meshing. At the same time, to prevent axial movement, a locking nut is also fitted at the spline connection. The locking nut adopts an anti-loosening self-locking structure, which can axially lock the connecting rod 52 and the output shaft of the motor 51, preventing the connection from loosening after long-term high-frequency operation. The other end of the connecting rod 52 is machined with an internal threaded hole. The pitch and thread angle of the threaded hole are specially designed to match the external threaded connector at the top of the screw 42. The threaded connection is coated with high-strength thread-locking adhesive, which not only ensures the tightness of the connection and the stability of the transmission, but also prevents the adhesive residue from causing jamming in the thread gap.

[0074] Using a high-response, high-torque AC servo motor as the power source, and with the precise transmission of the connecting rod 52, a strict linear correspondence can be achieved between the rotation angle of the motor 51 and the push stroke of the screw 42. The rotation angle can be precisely adjusted according to the dispensing requirements, thereby accurately controlling the extrusion amount of the adhesive.

[0075] During operation, the epoxy resin is heated and mixed evenly in the mixing tank, and then transmitted to the dispensing valve through the inlet conduit 3. At this time, the inlet 12 and outlet 11 are open, and the heating coil should be preheated to the appropriate temperature in the constant temperature chamber 21. The inlet 12 continues to pump epoxy resin to the outlet, and dispensing continues for 3-5 minutes to expel air from the propulsion chamber 100, ensuring the resin is fully saturated. The dispensing volume is precisely controlled by the motor 51. When dispensing is complete, the inlet 12 is closed, and the screw 42 continues to operate to remove as much resin as possible from the dispensing valve body 1, facilitating equipment cleaning.

[0076] During cleaning and maintenance, since there is no glue mixing process inside the dispensing valve body 1, cleaning only requires replacing the glue inlet guide tube 3 and draining the glue from the glue outlet 11. At the same time, the connecting rod 52 and the screw 42 are threadedly connected, and the screw 42 is a detachable part, which facilitates cleaning of the equipment after dispensing; and the stator 41 is also a detachable part, which also facilitates cleaning of the equipment after dispensing.

[0077] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A dispensing device, characterized in that, include: The dispensing valve body is equipped with an inlet and an outlet for dispensing. The drive assembly is located on the dispensing valve body; The temperature control component is thermally coupled to the dispensing valve body; A dispensing execution component is disposed in the dispensing valve body and is connected to the driving component for driving the adhesive to be quantitatively extruded from the dispensing port under the drive of the driving component. The temperature control component includes a constant temperature chamber and a heating element. The constant temperature chamber is filled with a heat-conducting medium, and the heating element is used to heat the heat-conducting medium.

2. The dispensing device according to claim 1, characterized in that, The heat-conducting medium is heat-conducting oil.

3. The dispensing device according to claim 2, characterized in that, The heating element is an electric heating coil arranged around the constant temperature chamber. The constant temperature chamber is also equipped with a temperature detection element for feedback control of the heating power of the electric heating coil.

4. The dispensing device according to claim 1, characterized in that, The dispensing execution assembly includes a screw and a stator, and a propulsion cavity for propelling the flow of adhesive is formed between the screw and the stator. The adhesive inlet and the adhesive outlet are connected to the propulsion cavity.

5. The dispensing device according to claim 4, characterized in that, The stator is detachably connected to the dispensing valve body via a snap-fit ​​structure.

6. The dispensing device according to claim 1, characterized in that, It also includes a glue inlet conduit, the outlet end of which is detachably connected to the glue inlet.

7. The dispensing device according to claim 6, characterized in that, The glue inlet conduit is a double-layered tube, and heat-conducting oil or heating wires are circulated within the interlayer of the double-layered tube.

8. A dispensing device according to claim 6, characterized in that, It also includes a mixing tank, which is connected to the inlet end of the glue inlet conduit.

9. A dispensing device according to claim 1, characterized in that, Both the glue inlet and the glue outlet are equipped with control valves.

10. A dispensing device according to claim 4, characterized in that, The drive assembly includes a motor and a connecting rod, one end of which is connected to the motor and the other end of which is connected to the screw.

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