Electrically conductive glue injection device

Abstract

The application provides a conductive glue injection device, relates to the technical field of conductive rubber strip installation, and comprises a glue storage cylinder, a glue outlet head assembly, an extrusion piston, an extrusion screw and an end cover. One end of the glue storage cylinder is connected with the glue outlet head assembly, and the other end is closed by the end cover. A threaded through hole is formed in the center of the end cover, the extrusion screw passes through the threaded through hole of the end cover and extends into the glue storage cylinder, and is connected with the extrusion piston. The extrusion screw rotates relative to the end cover, drives the extrusion piston to move along the axial direction of the glue storage cylinder, and extrudes the conductive glue in the glue storage cylinder from the glue outlet head assembly. Through the combination of threaded transmission and piston propulsion, the device can form a continuous, uninterrupted and uniform glue layer in the installation groove, improve the overall gluing efficiency and the electromagnetic compatibility shielding performance of the electrical box, greatly reduce the operation thrust required for single glue extrusion, reduce the labor intensity of the operator, shorten the production cycle, and provide stable and reliable process guarantee for the batch production of electrical boxes.

Description

Technical Field

[0001] This application relates to the field of conductive rubber strip installation technology, and more specifically, to a conductive adhesive dispensing device. Background Technology

[0002] With the increasing integration of electronic devices, their internal functional modules are becoming increasingly sensitive to external electromagnetic interference (EMI). In fields such as aviation, communications, and instrumentation, efficient and reliable shielding systems have become crucial for ensuring the electromagnetic compatibility (EMC) performance of equipment. Electrical enclosures and their covers, as important components of the equipment housing, often have connection points that are key areas for electromagnetic leakage. Therefore, effective shielding measures are necessary to prevent external interference signals from entering the enclosure or signals from within the enclosure from leaking into the external environment, thereby ensuring the stable operation of the entire device and the accuracy of data transmission.

[0003] In common shielding structures, conductive rubber strips are typically installed in the mating groove between the enclosure cover and the housing. Due to their good elasticity and conductivity, the conductive rubber strips can form a continuous conductive path through compression, achieving an electromagnetic equipotential connection between the enclosure cover and the housing. However, to ensure the conductive rubber strips are tightly and stably fixed in the mounting groove, conductive adhesive is often used as an bonding medium. Conductive adhesive has a high viscosity; it is applied evenly to the bottom of the mounting groove, and then the conductive rubber strip is pressed into the groove. After curing, a firm bond is achieved.

[0004] Traditional adhesive dispensing devices typically use a push-type extrusion method to apply conductive adhesive. However, due to the extremely high viscosity of the conductive adhesive, the push rod needs to overcome significant frictional resistance during the extrusion process, making the operation time-consuming and labor-intensive, and long-term operation can easily lead to operator fatigue. Secondly, the thickness and uniformity of the adhesive application are difficult to maintain due to the operator's experience and control over the force applied, resulting in uneven accumulation of conductive adhesive in the tank, which in turn affects the continuity of the shielding. Utility Model Content

[0005] The purpose of this application is to provide a conductive adhesive dispensing device to address the shortcomings of the above-mentioned technology.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] This application provides a conductive adhesive dispensing device, including an adhesive storage cylinder, an adhesive dispensing head assembly, an extrusion piston, an extrusion screw, and an end cap. One end of the adhesive storage cylinder is connected to the adhesive dispensing head assembly, and the other end is closed by the end cap. A threaded through hole is opened in the center of the end cap, and the extrusion screw passes through the threaded through hole of the end cap and extends into the adhesive storage cylinder, connecting with the extrusion piston. The extrusion screw rotates relative to the end cap, driving the extrusion piston to move axially along the adhesive storage cylinder, so as to expel the conductive adhesive in the adhesive storage cylinder from the adhesive dispensing head assembly.

[0008] Furthermore, the dispensing head assembly includes several dispensing heads with different dispensing sizes, and each dispensing head is switched and connected to the glue storage cylinder.

[0009] Furthermore, the extrusion screw includes a first screw and a second screw connected coaxially. The diameter of the first screw is larger than that of the second screw. The first screw is threadedly connected to the threaded through hole of the end cap. The extrusion piston has an opening at one end near the extrusion screw. The second screw passes through the opening and is threadedly connected to the inner wall of the extrusion piston.

[0010] Furthermore, the second screw passes through the flat washer and is threaded into the inner wall of the extrusion piston.

[0011] Furthermore, the second screw passes through the spring pad and is threaded into the inner wall of the extrusion piston.

[0012] Furthermore, the conductive adhesive dispensing device also includes a drive mechanism, which is connected to the end of the extrusion screw that is away from the extrusion piston.

[0013] Furthermore, a handle is provided at the end of the extrusion screw that is away from the extrusion piston, so that the operator can rotate the extrusion screw by turning the handle.

[0014] Furthermore, as the extrusion screw rotates relative to the end cap and moves axially along the glue reservoir until the handle abuts against the end cap, the extrusion piston moves to one end of the glue reservoir near the glue outlet assembly.

[0015] Furthermore, a sealing groove is provided on the outer wall of the extrusion piston, and a sealing ring is installed in the sealing groove to ensure that the extrusion piston always maintains a seal with the rubber storage cylinder when it moves.

[0016] Furthermore, the dispensing head assembly is threadedly connected to the glue storage cylinder.

[0017] The beneficial effects of this application include:

[0018] This application provides a conductive adhesive dispensing device, including an adhesive reservoir, an adhesive dispensing head assembly, an extrusion piston, an extrusion screw, and an end cap. One end of the adhesive reservoir is connected to the dispensing head assembly, and the other end is sealed by the end cap. A threaded through-hole is formed in the center of the end cap, through which the extrusion screw extends into the adhesive reservoir and connects to the extrusion piston. The extrusion screw rotates relative to the end cap, driving the extrusion piston to move axially along the adhesive reservoir, thereby extruding the conductive adhesive from the reservoir through the dispensing head assembly. Through the combination of threaded drive and piston propulsion, this device can form a continuous, uninterrupted, uniform adhesive layer in the mounting groove, improving overall adhesive application efficiency and the electromagnetic compatibility shielding performance of the electrical enclosure. Simultaneously, this device can provide a large thrust output for high-viscosity conductive adhesive without requiring significant manual or pneumatic pressure, greatly reducing the operating thrust required for a single dispensing operation, lowering the operator's labor intensity, shortening the production cycle, and providing a stable and reliable process guarantee for the mass production of electrical enclosures. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of a conductive adhesive dispensing device provided in this application;

[0021] Figure 2 This is the second schematic diagram of a conductive adhesive dispensing device provided in this application.

[0022] Icons: 1-Dispensing head; 2-Glue reservoir; 3-Sealing ring; 4-Sealing groove; 5-Extrusion piston; 6-Flat washer; 7-Spring washer; 8-End cap; 9-First screw; 10-Second screw; 11-Extrusion screw; 12-Handle. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The technical solution of this application will be described in detail below with reference to specific embodiments.

[0030] This application provides a conductive adhesive injection device for the mounting groove of conductive rubber strips in electrical enclosures, such as... Figure 1 and Figure 2 As shown, the device includes a glue storage cylinder 2, a glue dispensing head assembly, a compression piston 5, a compression screw 11, and an end cap 8. The glue storage cylinder 2 serves as the main container of the device, its core function being to store a fixed quantity of conductive glue. One end of the glue storage cylinder 2 is connected to the glue dispensing head assembly to direct the conductive glue within the cylinder and precisely apply it to the equipment mounting slot. The other end is sealed by the end cap 8 to ensure airtightness. The compression piston 5 is movably connected to the inner cavity of the glue storage cylinder 2, enabling it to move smoothly axially within the cylinder, applying uniform pressure to the conductive glue and forcing it to be extruded along a pre-defined flow path, ultimately being delivered to the glue dispensing head assembly. The end cap 8 has a threaded through hole at its center, which threadedly engages with the compression screw 11, forming a key mechanism for converting rotational motion into axial propulsion force.

[0031] A drive mechanism (such as a motor, pneumatic motor, or operator) is connected to the end of the extrusion screw 11 opposite to the extrusion piston 5. When the drive mechanism applies a clockwise torque to the end of the extrusion screw 11 opposite to the extrusion piston 5, the extrusion screw 11 rotates relative to the end cap 8 and moves forward along the axis of the glue storage cylinder 2, driving the extrusion piston 5 to move forward at a constant speed matching the lead of the extrusion screw 11, orderly pressurizing the conductive glue in the cylinder and pushing it towards the glue dispensing head assembly. During this process, due to the mechanical advantages of the threaded drive, even under high viscosity or high flow conditions, stable and precise flow control can be achieved, avoiding the glue backflow or dripping that may occur when the pneumatic push or manual pressure plate is suddenly released. After the conductive glue in the glue storage cylinder 2 is completely extruded, only a counterclockwise torque needs to be applied to the end of the extrusion screw 11 opposite to the piston, and the extrusion screw 11 will rotate in the opposite direction relative to the end cap 8 and move backward, simultaneously driving the extrusion piston 5 to retreat to the initial position, making room for subsequent replenishment of conductive glue.

[0032] In practical implementation, extrusion screws 11 with different leads and pitches can be selected according to the viscosity of the conductive adhesive and the required extrusion rate. The extrusion volume and process speed can be steplessly adjusted by changing the drive mechanism or adjusting the motor speed and air pressure. The thread diameter and lead of the extrusion screw 11 should be tightly fitted with the threaded through hole of the end cap 8 to ensure no leakage or jamming. Furthermore, the length of the extrusion screw 11 should match the length of the glue storage cylinder 2 to ensure that the extrusion screw 11 is always in close engagement with the inner wall thread of the glue storage cylinder 2 throughout the entire reciprocating stroke, avoiding pressure fluctuations and glue leakage caused by screw protrusion or incomplete engagement. By designing the extrusion screw 11 to be the same length as the glue storage cylinder 2, effective pressure transmission can be ensured throughout the piston's displacement from the initial to the final position. This also fully utilizes the volume of the entire glue storage cylinder 2, allowing all the conductive adhesive to be extruded, improving material utilization and reducing the frequency of downtime for cleaning.

[0033] Overall, by combining threaded drive and piston propulsion, this device can form a continuous, uninterrupted, uniform adhesive layer in the mounting groove, improving overall adhesive application efficiency and the electromagnetic compatibility shielding performance of the electrical enclosure. At the same time, the device can provide high thrust output for high-viscosity conductive adhesive without requiring huge manual or pneumatic pressure, significantly reducing the operating thrust required for a single dispensing, reducing the labor intensity of operators, shortening the production cycle, and providing a stable and reliable process guarantee for the mass production of electrical enclosures.

[0034] Furthermore, the end cap 8 adopts a detachable connection structure, threadedly engaging with the outer wall of the glue storage cylinder 2 at the end opposite to the glue dispensing head assembly, achieving a stable connection and quick separation between the end cap 8 and the cylinder body. Specifically, the end cap 8 has a first threaded through hole and a second threaded through hole that are axially connected. The diameter of the first threaded through hole is larger than that of the second threaded through hole, used for threaded connection with the outer wall of the glue storage cylinder 2; the second threaded through hole is used for threaded connection with the extrusion screw 11. During assembly, the first threaded through hole of the end cap 8 is first screwed into the outer wall of the glue storage cylinder 2 to ensure high airtightness and high mechanical strength between the end cap 8 and the cylinder body; then, the extrusion screw 11 is inserted into the second threaded through hole in the center of the end cap 8 and engages with the thread matching the inner diameter of the end cap 8; finally, the front end of the screw is connected to the extrusion piston 5. This connection sequence simplifies the assembly process and ensures coaxial alignment between the screw and piston, the end cap 8, and the cylinder body, avoiding malfunctions such as misalignment and jamming during the extrusion process.

[0035] In a specific implementation, simply loosen the threaded connection between the end cap 8 and the glue storage cylinder 2 by turning it counterclockwise to remove the end cap 8 and the extrusion screw 11 together, exposing the remaining conductive glue inside the cylinder. At this point, conductive glue can be quickly added or replaced, and the inner wall of the cylinder can be directly cleaned and maintained, eliminating the hassle of disassembling the entire machine and greatly saving usage and maintenance time. When reassembling, simply tighten the screws in reverse order until they are in position to restore the sealing and guiding functions, without the need for additional tools or calibration.

[0036] With the detachable connection design of the end cap 8, the device achieves convenient maintenance while ensuring efficient extrusion and precise coating. Operators can replenish conductive adhesive and clean the adhesive storage tank 2 in a very short time without additional downtime or disassembly of complex parts, further improving the continuity and capacity of the production line.

[0037] Furthermore, the dispensing head assembly comprises multiple independent, standardized dispensing heads 1, each with a preset, distinct spray channel geometry (such as width and cross-sectional shape). These dispensing heads 1 are not fixedly connected but are designed for quick switching connections with the glue reservoir 2. The core purpose of this modular design is to directly adapt to the conductive rubber strip mounting grooves of varying depths, widths, and shapes on the target electrical enclosure.

[0038] To achieve a quick, reliable, and sealed connection between the glue reservoir 2 and each glue dispensing head 1, a standardized mechanical interface is provided at the front end of the glue reservoir 2 (i.e., near the connection end of the glue dispensing head 1). This interface can be specifically manifested as an outwardly protruding connection protrusion or an externally threaded wall. Correspondingly, at the rear end of each standardized glue dispensing head 1 (i.e., near the connection end of the glue reservoir 2), a complementary structure that perfectly matches the front end interface of the glue reservoir 2 is precisely machined, namely, an inwardly recessed connection groove (for accommodating the protrusion) or an internally threaded hole (for engaging the external thread). This precise interface design ensures that any selected glue dispensing head 1 can form a stable and detachable connection with the glue reservoir 2, and achieves the necessary fluid seal at the connection point to prevent leakage of conductive glue under high pressure.

[0039] In terms of material selection, the glue storage cylinder 2 and all specifications of the glue dispensing head 1 can preferably be made of LY12 high-strength aluminum alloy through precision machining. The key consideration in choosing LY12 aluminum alloy is its excellent material compatibility with commonly used conductive adhesive packaging materials (usually also aluminum alloys). This consistency ensures that the core components of the device (glue storage cylinder 2, glue dispensing head 1) and the conductive adhesive will not undergo harmful electrochemical reactions or corrosion under long-term contact and high-pressure extrusion conditions, thus fundamentally guaranteeing the long-term working stability, durability, and purity of the extruded conductive adhesive components of the device.

[0040] In practice, first, based on the specific dimensions (mainly the width) and geometry (e.g., rectangular, irregular) of the target installation slot, select a matching dispensing head 1 from the dispensing head 1 assembly. Operators can quickly replace and reliably lock the dispensing head 1 to the front end of the glue reservoir 2 within seconds using simple manual screwing or snap-fit ​​connections, without the need for additional tools. Upon startup, the drive mechanism connected to the rear end of the extrusion screw (i.e., the end facing away from the conductive adhesive) is activated. The force generated by this drive mechanism is strictly transmitted along the axial direction of the glue reservoir 2, pushing the extrusion piston 5 to make a smooth, directional axial thrust within the reservoir. During this process, the extrusion piston 5 applies uniform and continuous pressure (isobaric extrusion) to the conductive adhesive within the glue reservoir 2. Under pressure, the conductive adhesive is forced along the cavity of the glue reservoir 2, through the connection interface, and into the internal flow channel of the selected dispensing head 1. Because dispensing heads 1 of different specifications have preset and precisely controlled spray channel cross-sectional areas and shapes, when the conductive adhesive flows through this channel, it is forcibly constrained by the channel wall, resulting in a significant change in its flow state. For the narrow-channel dispensing head 1, the adhesive is compressed and accelerated to form a thin and thick adhesive line; for the wide-channel dispensing head 1, the adhesive is moderately stretched and expanded to form a wide and thin adhesive layer. This physical mechanism, which precisely controls the extrusion morphology of the adhesive by changing the flow channel geometry, enables the device to mold the conductive adhesive into an adhesive strip with a specific width and thickness that conforms to the width and shape requirements of the target mounting groove, maintaining high uniformity, continuity, and no breaks, thus achieving effective electromagnetic sealing.

[0041] In summary, the conductive adhesive dispensing device provided in this application can quickly replace the matching dispensing head 1 to address the diversity of sizes and shapes of the conductive rubber strip mounting grooves in electrical enclosures, achieving precise control over the adhesive width and thickness. Furthermore, it ensures a continuous and uniform conductive adhesive layer without any breaks during the extrusion and spraying process, significantly improving adhesive application efficiency and product quality.

[0042] Furthermore, the extrusion screw 11 includes a first screw 9 and a second screw 10 connected axially. The first screw 9 has a larger diameter, and its external thread is threaded to the inner wall of the threaded through hole of the end cap 8, responsible for transmitting torque and axial thrust to the extrusion piston 5 in the glue reservoir 2. The second screw 10 has a smaller diameter, passes through the opening at the rear end of the extrusion piston 5 and is threaded to the inner wall of the extrusion piston 5, so as to drive the extrusion piston 5 to advance or retract synchronously when the first screw 9 moves.

[0043] Specifically, the first screw 9 and the second screw 10 are coaxially connected, resulting in concentrated force transmission without off-center loading. After assembly, when the drive mechanism applies torque to the first screw 9, the first screw 9 rotates forward along the threaded through hole, while the second screw 10, relying on its fixed connection with the piston's inner wall thread, drives the piston to advance axially a equidistant distance. Conversely, under the action of reverse torque, the first screw 9 drives the second screw 10 and the piston backward together, creating space for the glue reservoir 2 to inject new glue. Through the differentiated screw diameters and thread fits, the division of labor for thrust and guidance is achieved: the large-diameter first screw 9 undertakes the main drive and self-locking, while the small-diameter second screw 10 focuses on maintaining the stable positioning of the extrusion piston 5, eliminating radial wobble between the extrusion piston 5 and the cylinder. The compression piston 5 has a closed design near the conductive adhesive end to ensure that a large area and uniform force surface can be formed when in contact with the conductive adhesive; while the open structure at the other end provides a precise inlet for the insertion and locking of the second screw 10. The surface-hardened threads and opening edges can withstand the friction and corrosion caused by long-term reciprocating operation.

[0044] Furthermore, before the second screw 10 penetrates the inner thread of the extrusion piston 5, it is sequentially equipped with a spring washer 7 and a flat washer 6 to achieve pre-tightening of the threaded connection and to compensate for the surface clearance between the devices. Specifically, after the small end of the second screw 10 passes through the opening at the rear end of the piston, it first passes over the spring washer 7 located on one side of the piston housing. The spring washer 7 generates a reverse torque through its own elasticity when the thread is loaded, and it fits tightly against the piston end face to prevent the thread from loosening. Next, it passes over the flat washer 6, which ensures the complete flatness of the contact surface. Finally, it enters the threaded hole in the inner wall of the piston to complete the rigid thread engagement with the extrusion piston 5.

[0045] In practical implementation, a flat washer 6 made of LY12 aluminum alloy, the same material as the screw and piston, can be selected, and an elastic steel spring washer 7 with excellent elasticity and resistance to fatigue should be used. The inner and outer diameters and tolerances of the washers should be strictly matched with the screw diameter to ensure that there is no radial wobble after pressing into place. During assembly, it is recommended to first hand-tighten to the initial positioning, and then tighten to the specified torque value to ensure that the spring washer 7 is compressed to the designed deformation, thereby obtaining a stable preload force, and further tightening by applying an appropriate amount of anti-loosening and anti-corrosion thread sealant.

[0046] Furthermore, an ergonomic handle 12 is provided at the end of the extrusion screw 11 opposite to the extrusion piston 5. The handle 12 is tightly connected to the tail end of the screw via a spline, hexagonal shank, or quick-change sleeve, which can withstand the torque during operation and allow for quick disassembly and replacement. The handle 12 has a cylindrical grip or T-shaped bar structure, and the grip surface is provided with a textured surface or a non-slip rubber sleeve to increase the coefficient of friction and ensure that the operator can apply force steadily without slipping, even in high-viscosity environments or when wearing gloves.

[0047] The handle 12 engages with the spline at the tail of the screw, directly transmitting manual torque to the screw. Simultaneously, the spline self-locking mechanism or a locking pin ensures a secure connection under repeated rotation and heavy loads, preventing loosening. Furthermore, an axial limiting shoulder or thrust washer is incorporated at the connection between the handle 12 shaft and the screw shaft to prevent the handle 12 from detaching from the screw due to excessive twisting or causing adverse impacts to the drive mechanism.

[0048] It should be noted that by extending the effective radius of the handle 12, operators can generate greater torque with less hand force, quickly overcoming the viscosity resistance of the conductive adhesive. Simultaneously, the anti-slip texture and the grip design conforming to the palm's contour ensure smoother torque output, reducing the likelihood of sudden slippage or "free-spinning." Furthermore, the handle 12 can be made of high-strength aluminum alloy or stainless steel, anodized or powder-coated to balance lightweight and corrosion resistance; the grip sleeve is made of oil-resistant and wear-resistant silicone or thermoplastic rubber, ensuring it won't age or detach over extended use. A quick-release pin or latching mechanism can be designed at the interface between the handle 12 and the screw, allowing maintenance personnel to quickly disassemble the handle 12 by simply pressing the release button, simplifying daily maintenance and cleaning procedures.

[0049] Furthermore, the end cap 8, through its physical limiting engagement with the handle 12, enables precise control of the stroke of the extrusion screw 11 and the extrusion piston 5. The axial distance between the end cap 8 and the handle 12 corresponds one-to-one with the effective stroke within the glue storage cylinder 2. As the extrusion screw 11 rotates continuously relative to the glue storage cylinder 2 and moves forward along the cylinder axis under the action of the drive mechanism, the handle 12 gradually approaches the end cap 8. The instant the handle 12 and the end cap 8 come into tight contact, it means that the extrusion piston 5 has just advanced to the end of the glue storage cylinder 2 closest to the glue outlet 1—that is, the maximum extrusion stroke of the conductive glue within the entire cylinder has been completed. Utilizing the rigid contact surface between the handle 12 and the end cap 8 as the stroke stop signal eliminates the need for additional electronic sensors or complex detection devices, simplifying the mechanical structure while ensuring the reliability and repeatability of stroke control. In addition, a buffer washer can be designed on the outer periphery of the end cap 8, providing slight cushioning when the handle 12 comes into contact, reducing impact, and maintaining the high-pressure sealing of the glue storage cylinder 2 to prevent external impurities from entering or conductive glue from leaking out.

[0050] Furthermore, one or more annular sealing grooves 4 are machined along the circumferential direction on the outer wall of the extrusion piston 5 to fit the elastic sealing ring 3, so as to ensure that the sealing ring 3 can fully deform and fill the gap between the groove wall and the inner wall of the glue storage cylinder 2 when the extrusion piston 5 moves, so that the extrusion piston 5 always maintains a seal with the glue storage cylinder 2.

[0051] When the extrusion piston 5 reciprocates axially along the glue storage cylinder 2 under the drive of the extrusion screw 11, the sealing ring 3 is always in a moderately compressed state. One end abuts against the sealing groove wall, while the other end is subjected to the lateral reaction force of the cylinder wall, firmly pressing the three-dimensional annular contact surface against the inner wall of the cylinder. Whether during the pushing stroke of the glue under pressure or during the piston return stroke, this design can maintain continuous contact with the inner wall of the cylinder by relying on the elastic restoring force of the sealing ring 3 and the lateral restraint force of the groove wall. In this way, even with the high viscosity of the conductive glue or the large working pressure, it cannot leak through the tiny gaps between the piston and the cylinder wall.

[0052] It should be noted that the position and number of sealing grooves 4 can be optimized according to the cylinder length and working pressure distribution. For example, for a long storage cylinder 2, one or two sealing grooves 4 can be set in the middle section and the front end of the piston; while for a small-volume cylinder, only one high-performance sealing groove can be set. The assembly of all sealing grooves 4 and sealing rings 3 is completed in a clean environment to prevent particulate contamination from affecting the sealing effect. The material of the sealing ring 3 can be a highly elastic, chemically resistant, and wear-resistant elastomer such as fluororubber (FKM) or polyurethane (PU).

[0053] In summary, this application provides a highly efficient and reliable conductive adhesive dispensing device. Its core components include a glue storage cylinder 2 precision machined from LY12 aluminum alloy, a dual-stage extrusion screw 11, a closed-plane extrusion piston 5, an interchangeable dispensing head 1, an end cap 8, and an ergonomic handle 12. Through the organic combination of modular mechanical interfaces, threaded transmission, and fluid dynamics principles, it achieves full-stroke, full-section, dead-angle-free extrusion and precise control of conductive adhesive. In this device, the first screw 9 tightly engages with the inner wall of the second threaded through hole of the end cap 8 and bears the main driving force. The second screw 10 passes through the opening at the rear end of the piston, and sequentially passes through the spring washer 7 and the flat washer 6 to be threadedly fixed to the inner wall of the piston for piston guidance. The outer wall of the piston is provided with an annular sealing groove 4 and a sealing ring 3 is embedded therein. Together with the flat end face of the piston, it ensures that efficient sealing and no glue backflow are maintained during extrusion and return. The rear end of the glue storage cylinder 2 is threadedly connected to the end cap 8, forming a physical limit with the handle 12. When the handle 12 is turned to the end cap 8, it means that the piston has completed its maximum stroke and all the glue has been extruded, which greatly simplifies stroke control. The entire system can be automatically driven by a motor or pneumatic motor or operated manually. This device takes into account the needs of high-precision thrust control, leak prevention, quick head change, and low labor intensity for operators, effectively improving the efficiency and consistency of dispensing conductive rubber strips in electrical boxes, and providing a solid process and hardware guarantee for large-scale batch automated production.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A conductive adhesive dispensing device, characterized in that, The device includes a glue storage cylinder (2), a glue dispensing head assembly, a compression piston (5), a compression screw (11), and an end cap (8). One end of the glue storage cylinder (2) is connected to the glue dispensing head assembly, and the other end is closed by the end cap (8). The end cap (8) has a threaded through hole in the center. The compression screw (11) passes through the threaded through hole of the end cap (8) and extends into the glue storage cylinder (2), connecting with the compression piston (5). The compression screw (11) rotates relative to the end cap (8), causing the compression piston (5) to move along the axial direction of the glue storage cylinder (2) to extrude the conductive glue in the glue storage cylinder (2) from the glue dispensing head assembly.

2. The conductive adhesive dispensing device according to claim 1, characterized in that, The dispensing head assembly includes several dispensing heads (1) with different dispensing sizes, and each dispensing head (1) is switched to be connected to the glue storage cylinder (2).

3. The conductive adhesive dispensing device according to claim 2, characterized in that, The extrusion screw (11) includes a first screw (9) and a second screw (10) coaxially connected. The diameter of the first screw (9) is larger than that of the second screw (10). The first screw (9) is threadedly connected to the threaded through hole of the end cap (8). The extrusion piston (5) has an opening at one end near the extrusion screw (11). The second screw (10) passes through the opening and is threadedly connected to the inner wall of the extrusion piston (5).

4. The conductive adhesive dispensing device according to claim 3, characterized in that, The second screw (10) passes through the flat washer (6) and is threaded to the inner wall of the extrusion piston (5).

5. The conductive adhesive dispensing device according to claim 3 or 4, characterized in that, The second screw (10) passes through the spring pad (7) and is threaded to the inner wall of the extrusion piston (5).

6. The conductive adhesive dispensing apparatus according to any one of claims 1 to 4, characterized in that, The conductive adhesive dispensing device also includes a driving mechanism, which is connected to the end of the extrusion screw (11) that is away from the extrusion piston (5).

7. The conductive adhesive dispensing apparatus according to any one of claims 1 to 4, characterized in that, A handle (12) is provided at the end of the extrusion screw (11) away from the extrusion piston (5) so that the operator can drive the extrusion screw (11) to rotate by turning the handle (12).

8. The conductive adhesive dispensing device according to claim 7, characterized in that, When the extrusion screw (11) rotates relative to the end cap (8) and moves along the axial direction of the glue storage cylinder (2) until the handle (12) abuts against the end cap (8), the extrusion piston (5) moves to one end of the glue storage cylinder (2) near the glue outlet assembly.

9. The conductive adhesive dispensing apparatus according to any one of claims 1 to 4, characterized in that, A sealing groove (4) is provided on the outer wall of the extrusion piston (5), and a sealing ring (3) is installed in the sealing groove (4) to ensure that the extrusion piston (5) always maintains a seal with the glue storage cylinder (2) when it moves.

10. The conductive adhesive dispensing apparatus according to any one of claims 1 to 4, characterized in that, The dispensing head assembly is threadedly connected to the glue storage cylinder (2).

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