A oscillating pump for hot melt adhesive

Abstract

A swing pump for hot melt adhesive, relating to the field of pump technology, includes a pump body, a swing component, a drive source, and a heating unit. The pump body has a swing chamber and a medium flow channel communicating with the swing chamber. The swing component is swingably disposed within the swing chamber. The power output end of the drive source is connected to the swing component for driving the swing component to swing back and forth within the swing chamber, thereby pushing the medium to flow in the medium flow channel. The heating unit is used to heat the medium flowing to the swing chamber. By using swing motion instead of linear motion to push the medium, the pump avoids the defects of linear motion sealing, such as the large stroke, large contact area, and strong adhesive adhesion, which easily lead to sealing failure. This effectively reduces the risk of adhesive leakage and achieves continuous adhesive dispensing.

Description

Technical Field

[0001] This invention relates to the field of pump technology for hot melt adhesives, specifically to a swing pump for hot melt adhesives. Background Technology

[0002] In manufacturing equipment such as woodworking edge banding machines, adhesive is a key bonding medium, and its stable supply is crucial to ensuring the quality and efficiency of the edge banding process. Adhesive typically has high viscosity, especially at room temperature or low temperatures, resulting in poor flowability, which poses a significant challenge to the pumping process.

[0003] In existing technologies, plunger pumps rely on the reciprocating linear motion of the plunger to complete the suction and discharge cycle of adhesive. However, due to the viscous nature of the adhesive, the plunger experiences periodic pressure changes at the sealing interface during its movement, causing the adhesive to easily seep out from tiny gaps at the seal ring or pump body joint, resulting in continuous leakage. This leakage not only wastes adhesive and contaminates the equipment but also increases maintenance frequency and costs. Although the industry has attempted to mitigate the leakage problem by using high-performance sealing materials, increasing the complexity of the sealing structure, or optimizing the pump body surface treatment, the effects have been limited because viscous media easily breach the sealing barrier under high pressure differentials, making long-term reliable sealing difficult to achieve.

[0004] Furthermore, the long reciprocating stroke of the plunger pump results in a significant intermittent dispensing process: adhesive is drawn in during the plunger retraction phase and discharged only during the extension phase. This causes drastic fluctuations in the dispensing flow rate, making it impossible to form a continuous and uniform adhesive flow. This discontinuity in dispensing directly affects the stability of the edge sealing process and product quality, leading to uneven bonding strength, discontinuous adhesive lines, or appearance defects, severely restricting production efficiency and product consistency. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art above, and to propose a swing pump for hot melt adhesive.

[0006] A oscillating pump for hot melt adhesive, comprising: A pump body, the pump body having a swing chamber and a medium flow channel communicating with the swing chamber; A swinging component is disposed within a swinging cavity, which can swing. A drive source, the power output end of which is connected to the swing component for transmission, is used to drive the swing component to swing back and forth in the swing cavity, so as to push the medium to flow in the medium channel; A heating unit for heating the medium flowing into the oscillating cavity.

[0007] Furthermore, this application also proposes that the driving source is a linear driving source, and the telescopic output end of the linear driving source is connected to the swinging component through a transmission mechanism. Furthermore, this application also proposes that the swing member is fixedly connected to a rotating shaft, the rotating shaft is rotatably supported on the pump body, and the transmission mechanism includes a connecting rod, one end of which is rotatably connected to the telescopic output end of the linear drive source, and the other end is rotatably connected to the rotating shaft. Furthermore, this application also proposes that the connecting rod is an irregularly shaped connecting plate. Furthermore, this application also proposes that the pump body includes a central block, and the swing chamber and the medium flow channel are disposed within the central block. Furthermore, this application also proposes that the medium flow channel includes an overflow cavity disposed within the central block, the overflow cavity being elongated and both ends of which are connected to the swing cavity. Furthermore, this application also proposes that the central block is provided with a glue outlet communicating with the overflow cavity and a glue inlet communicating with the swing cavity. Furthermore, this application also proposes that the dispensing hole is located at the middle position along the length of the overflow cavity. Furthermore, this application also proposes that the overflow cavity is provided with at least one unidirectional flow-limiting member to restrict the return flow of the medium from the overflow cavity to the swing cavity. Furthermore, this application also proposes that the one-way flow limiting component is a steel ball one-way valve, and the side wall of the overflow chamber is provided with a placement groove and an overflow channel. The steel ball one-way valve includes a steel ball, which is placed in the placement groove and can block or open the overflow channel. The overflow channel connects the swing chamber and the overflow chamber. Furthermore, this application also proposes that the heating unit includes a heating pump body, the heating pump body is provided with a medium heating channel, and the outlet of the medium heating channel is connected to the inlet of the swing chamber. Furthermore, this application also proposes that the heating pump body is provided with a heating chamber and a heating element installed in the heating chamber. Furthermore, this application also proposes that the heating element is a heating rod. Furthermore, this application also proposes that it further includes a flow guide plug and a support frame, the heating pump body is provided with an insertion cavity, the flow guide plug is inserted into the insertion cavity, the flow guide plug is provided with a part of the medium heating flow channel, and the support frame connects the flow guide plug and the pump body. Furthermore, this application also proposes that a connecting plate be included, on which both the pump body and the drive source are mounted. Furthermore, this application also proposes that the end of the connecting plate is provided with a mounting groove, and the pump body is installed in the mounting groove. Furthermore, this application also proposes that the inner cavity shape of the swing cavity is adapted to the swing trajectory of the swing component. Furthermore, this application also proposes that the swinging member be a swinging baffle. Furthermore, this application also proposes that the rotating shaft passes through the pump body, and the transmission mechanism is connected to the end of the rotating shaft that extends out of the pump body. Furthermore, this application also proposes that the swing pump for hot melt adhesive is mainly used in equipment such as woodworking edge banding machines and board bending machines to pump viscous adhesives and other media, aiming to solve the problems of glue leakage and discontinuous glue dispensing in existing plunger pumps. As described above, the oscillating pump for hot melt adhesive provided in this application includes a pump body, an oscillating component, and a drive source. The oscillating component reciprocates within the oscillating chamber to push the medium. By using oscillating motion instead of linear motion to push the medium, it avoids the defects of linear motion seals, such as the high risk of seal failure due to large stroke, large contact area, and strong adhesive adhesion. This effectively reduces the risk of adhesive leakage and achieves continuous dispensing. This oscillating motion significantly reduces pressure changes at the sealing interface, thereby reducing the risk of seal failure. Because the pressure fluctuations generated by the oscillating motion are small, and the oscillation trajectory matches the shape of the oscillating chamber, a relatively stable and minimal gap is maintained, effectively reducing the possibility of medium leakage from the sealing interface. This is particularly important for viscous media such as adhesives, as their high adhesion exacerbates leakage problems in linear seals. The oscillating pump achieves continuous pushing and conveying of the medium through continuous oscillating motion, solving the problem of discontinuous dispensing in traditional linear pumps. This continuity ensures the uniformity and stability of dispensing, improving the quality of processes such as edge sealing. The rotary sealing structure is more suitable for pumping high-viscosity media. By using a heating unit to preheat the medium, the viscosity of the medium can be further reduced and its fluidity improved, thereby ensuring smooth pumping. Attached Figure Description

[0008] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a schematic diagram of the exploded structure of the present invention; Figure 6 This is a schematic diagram of the central block's structure; In the diagram: 1. Connecting plate; 2. Center block; 21. Swinging chamber; 22. Overflow chamber; 4. Swinging baffle; 7. One-way flow limiting component; 71. Placement slot; 72. Overflow channel; 3. Pad; 31. Glue inlet hole; 32. Glue outlet hole; 9. Heating pump body; 91. Insertion chamber; 92. Glue outlet hole; 93. Heating chamber; 10. Flow guide plug; 101. Vertical through hole; 102. Connecting hole; 11. Support frame; 12. Heating rod; 201. Rotating shaft; 300. Linear drive source; 301. Telescopic output end; 400. Irregular connecting plate. Detailed Implementation

[0009] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] In woodworking edge banding machines and other equipment, traditional plunger pumps are prone to leakage at seals or joints when pumping viscous adhesives due to their reciprocating motion. Furthermore, the discontinuous dispensing action affects the uniformity and stability of the adhesive flow. These problems make it difficult to provide a pump structure that effectively reduces leakage and achieves continuous adhesive dispensing.

[0011] In response, this application proposes a swing pump for hot melt adhesive, comprising a pump body having a swing chamber 21 and a medium flow channel communicating with the swing chamber; a swing member oscillatingly disposed within the swing chamber; and a drive source having a power output end connected to the swing member for driving the swing member to reciprocate within the swing chamber, thereby propelling the medium to flow in the medium flow channel.

[0012] This embodiment provides a oscillating pump for hot melt adhesive, which mainly consists of a pump body, an oscillating component, and a drive source. The oscillating pump achieves the pushing and conveying of the medium through the reciprocating oscillation of the oscillating component within a defined cavity.

[0013] Specifically, the pump body is designed as the main structure of a swing pump for hot melt adhesives, housing the swinging components and forming a channel for media flow. The pump body can be integrally cast or precision machined, internally forming a swinging cavity and a media flow channel communicating with that cavity. Alternatively, the pump body can be assembled from multiple independent components, for example, by tightly connecting a main housing to one or more cover plates to collectively enclose the swinging cavity and media flow channel. The media flow channel can simply be represented as an inlet / outlet channel directly communicating with the swinging cavity for the introduction and discharge of the media.

[0014] The oscillating member is oscillatingly disposed within the aforementioned oscillating cavity. The oscillating member can be a simple blade or baffle, one end of which is pivotally connected or fixed, while the other end oscillates reciprocally within the oscillating cavity. Alternatively, the oscillating member can also be a fan-shaped block that rotates within the oscillating cavity at a limited angle via a central axis, thereby achieving the pushing of the medium.

[0015] The power output end of the drive source is connected to the swing component via a transmission connection, used to drive the swing component to reciprocate within the swing cavity, thereby propelling the medium to flow in the medium channel. The drive source can be an electromagnetic actuator or a hydraulic cylinder, which is connected to the swing component through a simple linkage mechanism, converting the linear reciprocating motion of the drive source into the swing motion of the swing component.

[0016] The oscillating pump for hot melt adhesive provided in this application effectively avoids the periodic high-pressure impact on the seals experienced by traditional plunger pumps during linear reciprocating motion by employing an oscillating component that reciprocates within the oscillating chamber to drive the flow of the medium. This significantly reduces the risk of leakage of viscous adhesive during pumping in equipment such as woodworking edge banding machines. Simultaneously, the oscillating pushing action enables more compact and continuous medium delivery, solving the problem of discontinuous adhesive dispensing in traditional pumps and ensuring the uniformity and stability of the dispensing.

[0017] In some of the above embodiments, the oscillating pump for hot melt adhesive drives an oscillating component to reciprocate within the oscillating chamber via a drive source to propel the medium flow. However, if the transmission method between the drive source and the oscillating component is not properly designed, the motion trajectory of the oscillating component may be inaccurate or the transmission efficiency may be low, thereby affecting the continuity and stability of the pumped medium. This is especially true when dealing with viscous media, where the requirements for drive smoothness and control precision are high.

[0018] In this regard, this application further proposes that the driving source is a linear driving source 300, and the telescopic output end 301 of the linear driving source is connected to the swinging member through a transmission mechanism 400.

[0019] Specifically, a linear drive source is a device that converts energy into linear reciprocating motion. Its advantages lie in its ability to directly provide linear thrust or pull, avoiding complex rotary-to-linear conversion mechanisms, thus simplifying the transmission chain and improving transmission efficiency and response speed. For example, an electric cylinder can be used as a linear drive source. The electric cylinder drives a lead screw or ball screw via a servo motor, converting rotary motion into precise linear reciprocating motion. It features high precision, high response speed, and programmable control, enabling precise control of the stroke, speed, and acceleration of the telescopic output end. Alternatively, a pneumatic cylinder can be used. Pneumatic cylinders use compressed air as a power source, have a relatively simple structure, are easy to maintain, and are low in cost, making them suitable for applications where high control precision is not required but reliable power is needed. Hydraulic cylinders can also be used, providing greater thrust and suitable for heavy-duty applications.

[0020] The telescopic output end is the component of a linear drive source that outputs linear motion. For example, in an electric cylinder, the telescopic output end is typically its telescopic rod; in a pneumatic or hydraulic cylinder, it is its piston rod. This telescopic output end transmits the power of the drive source to the transmission mechanism through its linear reciprocating motion, serving as a crucial interface for converting linear motion into oscillating motion.

[0021] The transmission mechanism is a mechanical device that connects the telescopic output end of the linear drive source to the oscillating component. Its function is to convert the linear reciprocating motion of the linear drive source into the reciprocating oscillating motion of the oscillating component. The design of this mechanism needs to ensure the smoothness, accuracy, and reliability of the motion conversion to meet the requirements of the oscillating pump for continuous and stable media delivery. For example, the transmission mechanism may include a connecting rod, one end of which is rotatably connected to the telescopic output end of the linear drive source, and the other end of which is rotatably connected to the oscillating component or its connected shaft, thereby converting the linear motion of the telescopic output end into the oscillating motion of the oscillating component.

[0022] By employing the above technical solution and using a linear drive source, with its telescopic output end connected to the oscillating component via a transmission mechanism, this oscillating pump achieves precise control over the reciprocating oscillating motion of the oscillating component. The linear drive source, especially an electric cylinder, provides high-precision position and speed control, allowing for precise adjustment of the oscillation trajectory and frequency of the oscillating component. This ensures the continuity and stability of media pumping and effectively avoids the problem of discontinuous glue dispensing. Simultaneously, this linear drive method simplifies the transmission chain, reduces mechanical wear and energy loss, and improves transmission efficiency and system reliability. The design of the transmission mechanism ensures a smooth transition from linear motion to oscillating motion, further optimizing pumping performance and reducing the risk of glue leakage.

[0023] In some embodiments described above in this application, a transmission connection is proposed between the telescopic output end of a linear drive source and the swinging component to drive the swinging component to reciprocate within the swinging cavity. However, in the process of converting linear motion into swinging motion, how to design a transmission mechanism that is simple in structure, reliable in transmission, and can accurately control the motion trajectory of the swinging component is a technical problem that needs to be solved.

[0024] In this regard, this application further proposes that the swinging component is fixedly connected to a rotating shaft 201, the rotating shaft is rotatably supported on the pump body, and the transmission mechanism includes a connecting rod, one end of the connecting rod is rotatably connected to the telescopic output end of the linear drive source, and the other end is rotatably connected to the rotating shaft.

[0025] Specifically, the oscillating component is integrally formed with the rotating shaft through a fixed connection, ensuring that the oscillating component can reciprocate synchronously and stably when the rotating shaft oscillates. This fixed connection can be achieved in various ways; for example, the oscillating component can be firmly connected to the rotating shaft using key connections, interference fits, welding, or bolt connections to withstand the torque and thrust generated during operation, ensuring transmission efficiency and reliability. The rotating shaft is designed to be rotatably mounted on the pump body, providing a stable center of rotation for the oscillating component's oscillation. The pump body, as the main structure of the oscillating pump, provides sufficient rigidity and support strength. The rotating shaft is typically supported by bearings (such as rolling bearings, sliding bearings, or composite material bearings) mounted on the pump body. These bearings effectively reduce rotational friction, improve transmission efficiency, and extend the service life of the rotating shaft and pump body. The connecting rod, as the core component of the transmission mechanism, is responsible for converting the reciprocating linear motion of the linear drive source into the reciprocating oscillating motion of the rotating shaft. The connecting rod is typically a rigid rod whose length and geometry are precisely designed according to the required oscillation angle, the stroke of the linear drive source, and the spatial layout. A rotary connection is used between the connecting rod and the telescopic output end of the linear drive source, allowing for relative angular changes to accommodate the conversion from linear motion to oscillating motion. This rotary connection can be achieved through pin connections, ball joint connections, or universal joint connections, ensuring efficient force transmission and smooth motion during the transmission process. The other end of the connecting rod is also rotaryly connected to the shaft, allowing the connecting rod to rotate freely relative to the shaft during oscillation. This connection method typically involves fixing a rocker arm or crank to the shaft and connecting the connecting rod to this rocker arm or crank via a pin or bearing, thereby effectively converting the push-pull force of the connecting rod into torque on the shaft, driving the oscillating component to oscillate.

[0026] The above technical solution transforms the reciprocating linear motion of the linear drive source into the precise reciprocating oscillation of the oscillating component, resulting in a simple structure and reliable transmission. The linkage mechanism ensures the controllable and stable motion trajectory of the oscillating component, effectively avoiding the risk of media leakage caused by inaccurate transmission and guaranteeing the continuity and stability of media delivery. Furthermore, compared to other complex transmission methods, this mechanism has the advantage of lower manufacturing and maintenance costs, improving the overall economy and practicality of the oscillating pump used for hot melt adhesives.

[0027] In response, this application further proposes that the connecting rod in the aforementioned transmission mechanism is an irregularly shaped connecting plate with several through holes. These through holes are used to reduce heat conduction and prevent heat from being conducted to the linear drive source.

[0028] In some embodiments described above in this application, a oscillating pump for hot melt adhesive is proposed, comprising a pump body, an oscillating chamber, and a medium flow channel communicating with the oscillating chamber. However, if the pump body adopts a multi-component combination or non-integrated design, the connection between the oscillating chamber and the medium flow channel may be complex, which may easily lead to leakage risks, and the overall structure may be relatively loose, which is not conducive to the compactness and efficient manufacturing of the pump body.

[0029] In response, this application proposes a swing pump for hot melt adhesive, wherein the pump body includes a central block 2, and the swing chamber 21 and the medium flow channel are disposed within the central block 2.

[0030] Center block 2, as a core component of the pump body, typically refers to a relatively independent, compact, and functionally concentrated solid part. As the core load-bearing structure of the pump, it integrates the pump's key working chambers and flow channels into a single unit. Center block 2 can be manufactured using a one-piece molding method, such as precision casting, CNC machining from a single piece of metal, or 3D printing. Its material is usually a metal with good mechanical strength, corrosion resistance, and machinability, such as stainless steel, aluminum alloy, or engineering plastics. One-piece molding or high-precision machining ensures the dimensional accuracy and surface finish of the internal chambers and flow channels of center block 2, reduces the risk of media leakage, and improves the overall performance and reliability of the pump.

[0031] In a oscillating pump for hot melt adhesives, the media flow channels typically refer to all the passages through which the media enters and exits the oscillating chamber and circulates within the pump. In this embodiment, the media flow channels mainly include the overflow chamber 22, which communicates with the oscillating chamber 21. Integrating these channels within the central block 2 means that these key functional areas are concentrated in a single, compact component. The oscillating chamber 21 can be designed as cylindrical, elliptical, or other geometries suitable for the movement of the oscillating component and is formed inside the central block 2 through precision machining. The media flow channels, such as the overflow chamber 22, are also formed inside the central block 2 through methods such as internal drilling, milling, or casting, and are precisely connected to the oscillating chamber 21. This integrated design requires a complex yet precise internal structure for the central block 2, necessitating a balance between fluid dynamics, structural strength, and manufacturing processes. For example, the cross-sectional shape and dimensions of the flow channels should be optimized to reduce flow resistance while ensuring that the wall thickness of the central block 2 is sufficient to withstand the operating pressure.

[0032] By centrally integrating the swing chamber 21 and the medium flow channel within the central block 2 using the aforementioned technical solution, a high degree of integration and compactness in the pump body structure is achieved. This integrated design simplifies the overall structure of the pump body, reduces the number of components and assembly steps, thereby significantly reducing manufacturing and assembly complexity. Simultaneously, since the swing chamber 21 and the medium flow channel are formed directly within the central block 2, their connection is more direct and tighter, effectively reducing potential leakage points and significantly improving the pump's sealing performance and operational reliability. Furthermore, concentrating key functional components in a single entity allows for a substantial reduction in the overall size of the pump, facilitating deployment in space-constrained applications and providing a more stable integration platform for potentially introduced functions such as heating and sensing, further enhancing the pump's overall performance and application flexibility.

[0033] This application further proposes that the medium flow channel includes an overflow cavity 22 disposed in the central block 2, the overflow cavity 22 being elongated and both ends of which are connected to the swing cavity 21.

[0034] Specifically, the overflow cavity 22 is a chamber located inside the central block 2 for temporarily storing and buffering the medium. The overflow cavity 22 serves to receive the medium pushed out by the oscillating member and provide a collection space before the medium is discharged, thereby helping to smooth the pulsating flow of the medium and ensuring the continuity of subsequent flow. The overflow cavity 22 can be implemented by forming a cavity with a specific shape and volume inside the central block 2 through precision machining, casting, or advanced 3D printing technology. The overflow cavity 22 is designed as an elongated shape, which facilitates the uniform distribution and flow of the medium within it. The elongated structure provides sufficient length for the medium to be buffered and collected after entering the overflow cavity 22 from the oscillating cavity 21, effectively reducing local pressure concentration. Simultaneously, the elongated design facilitates connection to both ends of the oscillating cavity 21, forming a symmetrical or asymmetrical flow channel layout. Furthermore, both ends of the overflow cavity 22 are connected to the oscillating cavity 21, meaning that there are two independent connection points or regions between the overflow cavity 22 and the oscillating cavity 21. As the oscillating component reciprocates within the oscillating cavity 21, it alternately pushes the medium to both sides of the cavity. By connecting the two ends of the overflow cavity 22 to these two areas of the oscillating cavity 21, it is ensured that the pushed-out medium effectively enters the overflow cavity 22 regardless of the direction of the oscillating component's movement. This bidirectional connection design is crucial for achieving continuous dispensing and buffering.

[0035] Through the above technical solution, the medium flow channel is designed as an overflow cavity 22, which can effectively collect and buffer the medium pushed out by the oscillating component, avoiding the instantaneous pressure fluctuations that may occur when the medium is directly discharged from the oscillating cavity 21. The elongated overflow cavity 22 design, combined with its two ends connected to the oscillating cavity 21, allows the medium to smoothly enter the overflow cavity 22 for temporary storage and collection, regardless of the direction in which the adhesive is pushed when the oscillating component oscillates back and forth. This structure effectively smooths the pulsating flow of the medium, thereby ensuring the continuity and stability of the medium output, solving the problem of discontinuous adhesive discharge, and improving pumping efficiency. During the process of the oscillating component oscillating back and forth to push the medium, the overflow cavity 22, as a buffer area, can effectively absorb the pressure pulses generated during the oscillation, ensuring that the medium is discharged from the pump body in a more stable and continuous manner, significantly improving the overall performance and adhesive quality of the oscillating pump for hot melt adhesive.

[0036] In some embodiments described above in this application, a oscillating pump for hot melt adhesive includes a central block 2, within which an oscillating chamber 21 and a media flow channel are provided. The media flow channel further includes an elongated overflow chamber 22 connected at both ends to the oscillating chamber 21. However, ensuring smooth entry of the media into the oscillating chamber 21 and discharge from the overflow chamber 22 to form a continuous and stable flow path is a key issue that needs to be addressed during effective media pumping. Without a clearly defined inlet and outlet design, the supply and discharge of the media will be obstructed, affecting pumping efficiency and stability.

[0037] In this regard, this application further proposes that the top of the central block 2 is provided with a pad 3, and the pad is provided with a glue outlet 31 communicating with the overflow cavity 22 and a glue inlet 32 ​​communicating with the swing cavity 21.

[0038] Specifically, the discharge port is a channel for discharging the pumped medium. It can be a hole formed by direct drilling, a threaded port for connecting to external pipes, or an integrated design as part of the internal flow channel of the central block 2. The size and shape of the discharge port are typically optimized based on the viscosity, flow rate, and required discharge pressure of the pumped medium to ensure smooth and efficient discharge. This discharge port communicates with the overflow chamber 22 and is designed to collect and discharge the medium pushed into the overflow chamber 22 by the oscillating member. The inlet port is a channel for introducing the medium into the pump body. It can be a simple inlet, an interface for connecting the medium supply line, and its design must consider the medium supply method, flow resistance, and the need to ensure a continuous supply of sufficient medium to the oscillating chamber 21. This inlet port communicates with the oscillating chamber 21, ensuring that the medium can directly enter the area where the oscillating member performs its pumping action.

[0039] This application further proposes that the dispensing hole is located at the middle of the length of the overflow cavity 22.

[0040] The dispensing orifice is a channel for discharging the medium, and its location is defined in the geometric center region of the overflow cavity. This positioning aims to optimize the efficiency and uniformity of medium discharge from the overflow cavity. Specifically, the opening position of the dispensing orifice can be precisely designed and machined during the manufacturing process of the pad to align it with the geometric centerline of the elongated overflow cavity.

[0041] By positioning the dispensing hole at the midpoint of the overflow chamber 22 along its length, the medium entering the overflow chamber 22 from both sides of the swing chamber 21 can converge towards the dispensing hole in a relatively symmetrical and uniform manner when the swinging component reciprocates. This symmetrical convergence path effectively avoids medium stagnation at both ends or in non-central areas of the overflow chamber 22, reducing flow resistance and ensuring smooth and continuous discharge of the medium. Especially when pumping viscous media, this optimized layout significantly reduces the risk of medium degradation or blockage caused by uneven local shear stress, improves pumping efficiency and the stability of medium output, and ensures uniform and continuous dispensing.

[0042] In some embodiments described above in this application, the oscillating pump for hot melt adhesive reciprocates within the oscillating chamber 21 via an oscillating member, pushing the medium into the overflow chamber 22, which communicates with the oscillating chamber 21, and discharging it through the adhesive outlet. However, during the oscillation of the oscillating member, the pressure within the oscillating chamber 21 changes periodically, which may cause the medium in the overflow chamber 22 to flow back into the oscillating chamber 21 at specific times, thereby affecting the stability of pumping and the continuity of adhesive dispensing.

[0043] To address this, this application further proposes the inclusion of two unidirectional flow-limiting components within the overflow chamber 22 to restrict the backflow of the medium from the overflow chamber to the swing chamber. These unidirectional flow-limiting components are devices that allow the medium to flow in one direction while simultaneously preventing or significantly limiting its backflow in the opposite direction. Their core function is to ensure that the medium maintains unidirectional flow throughout the pumping process, preventing the medium that has entered the overflow chamber 22 from flowing back into the swing chamber 21 when the pressure changes.

[0044] Specifically, this one-way flow restrictor can be implemented in various forms. For example, it can be a ball valve-type check valve, in which a ball is pushed open when the medium flows in the forward direction, allowing the medium to pass through, and when the medium attempts to flow in the reverse direction, the ball is pushed against the valve seat under the action of pressure difference, thereby blocking the flow path. Alternatively, it can employ structures such as plate valves, cone valves, or diaphragm valves. Plate valves typically consist of a flexible or rigid plate-like element that opens under forward fluid pressure and closes under reverse pressure. Cone valves achieve one-way shut-off through the cooperation of a conical valve core and a valve seat. Diaphragm valves utilize the deformation of an elastic diaphragm to control the one-way flow of fluid. Regardless of the form used, the design of the one-way flow restrictor must consider the viscosity of the medium, the operating temperature, and the required sealing performance to ensure that it can reliably prevent backflow during actual operation.

[0045] The one-way flow-limiting component is precisely positioned in the flow channel between the overflow chamber 22 and the swing chamber 21. Its function is to restrict the backflow of the medium from the overflow chamber 22 to the swing chamber 21. When the swinging component swings within the swing chamber 21, pushing the medium into the overflow chamber 22, the positive pressure of the medium causes the one-way flow-limiting component to open, allowing the medium to smoothly enter the overflow chamber 22. However, once the swinging component swings in the opposite direction, the pressure within the swing chamber 21 decreases. If the medium in the overflow chamber 22 attempts to flow back, the one-way flow-limiting component will immediately close, forming an effective seal and preventing backflow. This mechanism ensures the directionality of the medium during pumping, avoiding reduced pumping efficiency and discontinuous dispensing caused by backflow.

[0046] By incorporating a one-way flow-limiting component within the overflow chamber 22, this application effectively solves the problem of media flowing back from the overflow chamber 22 to the swing chamber 21. This one-way flow-limiting component ensures that after the media is pushed out of the swing chamber 21 by the swinging component and enters the overflow chamber 22, it can only flow along the preset dispensing direction and will not flow backward due to pressure fluctuations within the swing chamber 21. This significantly improves the pumping efficiency and the continuity and stability of dispensing for the swing pump used in hot melt adhesives. Combined with the elongated shape of the overflow chamber 22, with both ends connected to the swing chamber 21, and the dispensing hole located in the middle of the length of the overflow chamber 22, the introduction of the one-way flow-limiting component allows the media to more effectively collect within the overflow chamber 22 and be stably discharged, avoiding ineffective circulation of the media within the pump body. This ensures that each swing achieves the maximum effective dispensing volume, providing a solid foundation for subsequent precise dispensing.

[0047] In some embodiments described above, a one-way flow-limiting member 7 is proposed to be provided in the overflow chamber 22 to restrict the backflow of the medium from the overflow chamber 22 to the swing chamber 21. However, if the structural design of the one-way flow-limiting member 7 is unclear or unreasonable, it may cause unstable sealing performance when pumping viscous media, making it susceptible to the influence of medium viscosity, pressure fluctuations, or impurities, thus failing to effectively prevent the backflow of the medium, thereby affecting the stability of pumping and the continuity of dispensing.

[0048] In this regard, this application further proposes that the one-way flow limiting component 7 of the above-mentioned swing pump is a steel ball one-way valve. The side wall of the overflow chamber 22 is provided with a placement groove 71 and an overflow channel 72. The steel ball one-way valve includes a steel ball, which is placed in the placement groove 71 and can block or open the overflow channel 72. The overflow channel 72 connects the swing chamber 21 and the overflow chamber 22.

[0049] Specifically, the one-way flow-limiting component 7 is a ball-type check valve. A ball-type check valve is a valve that uses a spherical valve core to move under fluid pressure, thereby achieving one-way fluid flow. Its working principle is that when the medium flows in the permissible direction, the steel ball is pushed away from the valve seat by the medium pressure, allowing the medium to pass; when the medium attempts to flow back in the opposite direction, the steel ball is pushed against the valve seat by the pressure of the returning medium and / or its own gravity, thereby blocking the flow path and preventing backflow. This type of valve has a simple structure, sensitive operation, and reliable sealing, and is particularly suitable for one-way control of viscous media. Besides the ball-type structure, check valves can also adopt other forms known in the art, such as cone valves or disc valves, as long as they can achieve the one-way shut-off function.

[0050] The placement groove 71 is a recess or cavity on the side wall of the overflow chamber 22 specifically designed to accommodate the steel ball. Its shape and size are designed to match the steel ball, ensuring free movement within it and accurate positioning for sealing when needed. The placement groove 71 can be designed as hemispherical, cylindrical, or conical to accommodate the movement trajectory of the steel ball and sealing requirements. The overflow channel 72 is a passage connecting the swing chamber 21 and the overflow chamber 22. The steel ball controls the flow of the medium by blocking or opening this channel. The overflow channel 72 is typically a small orifice with a diameter slightly smaller than the steel ball so that the steel ball can effectively block it. Precise machining of the placement groove 71 and the overflow channel 72 is crucial for the sealing performance of the steel ball check valve.

[0051] The ball check valve includes a steel ball, which is placed in a placement groove 71 and can block or open the overflow passage 72. The steel ball is usually made of a high-hardness, wear-resistant material, such as stainless steel or ceramic, to ensure that it maintains shape stability and sealing performance during long-term use. The size and weight of the steel ball need to be selected according to the viscosity of the pumped medium, the pumping pressure, and the required opening / closing response speed. Without spring assistance, the weight of the steel ball and the medium pressure are the main driving forces for its movement. When the medium pressure in the swing chamber 21 is higher than that in the overflow chamber 22, the steel ball is pushed open, opening the overflow passage 72 and allowing the medium to flow into the overflow chamber 22; when the medium pressure in the overflow chamber 22 is higher than that in the swing chamber 21 or the pressure in the swing chamber 21 decreases, the steel ball falls back under the action of pressure difference and / or its own weight, blocking the overflow passage 72 and preventing the medium from flowing back.

[0052] Overflow channel 72 connects the swing chamber 21 and the overflow chamber 22. Overflow channel 72 is the only path for the medium to enter the overflow chamber 22 from the swing chamber 21, and its connectivity is a prerequisite for medium transport. Overflow channel 72 is typically one or more holes machined inside the center block 2. Its position and angle need to be carefully designed to ensure that the steel ball can open and close smoothly and minimize fluid resistance. The overflow channel 72 establishes the fluid connection between the swing chamber 21 and the overflow chamber 22 and provides the working interface for the steel ball check valve.

[0053] Through the above technical solution, the unidirectional flow-limiting component 7 is specifically designed as a steel ball check valve. The placement groove 71 and overflow channel 72 on the side wall of the overflow chamber 22 are used to accommodate and guide the steel ball, achieving reliable unidirectional flow of the medium from the swing chamber 21 to the overflow chamber 22. Under the pressure of the medium, the steel ball can sensitively open or block the overflow channel 72, effectively preventing the medium from flowing back from the overflow chamber 22 to the swing chamber 21 during pumping, thus ensuring the stability of pumping and the continuity of medium delivery. This simple, responsive, and reliable steel ball check valve can effectively cope with viscous media and pressure fluctuations, significantly reducing the risk of medium leakage and improving the working efficiency and dispensing quality of the swing pump.

[0054] When using the aforementioned oscillating pump to pump viscous media, especially materials such as adhesives, the problem of excessively high media viscosity is often encountered. High-viscosity media not only increase pumping resistance and reduce pumping efficiency, but may also lead to poor media flow, or even solidification at low temperatures, thereby clogging the flow channel and affecting the normal operation of the equipment and the continuity and stability of adhesive dispensing.

[0055] In this regard, this application further proposes a oscillating pump for hot melt adhesive, which also includes a heating unit for heating the medium flowing into the oscillating chamber.

[0056] A heating unit is a device that generates heat and transfers it to the target medium. Its main function is to increase the temperature of the medium, thereby altering its physical properties, such as reducing viscosity and increasing flowability. Heating units can take various forms, such as electric heaters (e.g., heating rods, heating tubes, PTC heating elements, thick-film heaters), steam heaters, hot water circulation heaters, or heating via electromagnetic induction. In practical applications, the selection of a heating unit is based on a comprehensive consideration of factors such as the properties of the medium, the required heating temperature, heating efficiency, and cost. For example, electric heating rods are often used for direct or indirect heating of fluids due to their simple structure, high heating efficiency, and ease of control. Heating the medium flowing into the oscillating chamber refers to increasing the medium's temperature through heat transfer before or during its entry into the oscillating chamber. This process aims to ensure that the medium's viscosity is within a suitable range when it enters the pumping core area, facilitating the effective propulsion of the oscillating components. Heating can be achieved by directly integrating the heating unit onto the medium flow channel wall, or by setting up a separate heating chamber through which the medium exchanges heat with the heating unit as it flows. Heating temperature is typically controlled by temperature sensors and controllers to ensure that the medium is heated to the preset temperature and to avoid overheating or underheating.

[0057] By incorporating a heating unit into a oscillating pump for hot melt adhesives and heating the medium flowing into the oscillating chamber, this application effectively solves the problem of pumping difficulties caused by excessively high medium viscosity. Specifically, when the viscous medium is heated before entering the oscillating chamber, its viscosity is significantly reduced, and its fluidity is improved. This allows the oscillating component to push the medium with less resistance as it oscillates within the chamber, thereby improving pumping efficiency and medium delivery speed. Simultaneously, the heating effect effectively prevents the medium from solidifying or crystallizing at low temperatures, avoiding the risk of flow channel blockage and ensuring the continuity and stability of medium flow. This preheating mechanism ensures that the medium remains in an optimal flow state throughout the pumping process, thus significantly improving the performance of the oscillating pump for hot melt adhesives when handling high-viscosity media, reducing energy consumption, and extending the equipment's service life.

[0058] In some of the embodiments described above in this application, a heating unit is proposed to heat the medium flowing into the swing cavity. However, if the heating unit lacks a specific structural design, it may result in low heating efficiency of the medium, or the heated medium may not be effectively and directly introduced into the inlet of the swing cavity, thereby affecting the performance of pumping viscous media.

[0059] In this regard, this application further proposes that the heating unit includes a heating pump body 100, the heating pump body is provided with a medium heating channel, and the outlet of the medium heating channel is connected to the glue inlet of the pad.

[0060] The heating pump body is a structure specifically designed to carry out the heating function and guide the flow of the medium. It can be a standalone module or part of the pump body. Its material is typically a metal with good thermal conductivity, such as aluminum alloy or stainless steel, to ensure efficient heat transfer to the medium. The heating pump body usually has internal flow channels to allow the medium to remain within them for a sufficient time for heating. These medium heating channels are passages located inside the heating pump body and guide the medium to be heated. The geometry and length of these channels can be optimized according to the viscosity, flow rate, and required heating temperature of the medium. For example, they can be designed as meandering paths to increase the contact area and time between the medium and the heating wall, or as multi-channel parallel structures to increase the processing flow rate. The outlet of the medium heating channel is connected to the inlet of the oscillating chamber. This connection ensures that the heated medium can directly and smoothly enter the oscillating chamber, avoiding heat loss or re-cooling of the medium before entering the oscillating chamber. The connection method can be through pipes, integrated channels, or direct interface docking, and sealing measures are usually required to prevent medium leakage.

[0061] By explicitly defining the heating unit as a heating pump body with a medium heating channel and ensuring that the outlet of this channel is directly connected to the inlet of the swing chamber, this application provides a clearly structured and well-defined heating path for the medium. This design allows the medium to be fully heated in a controlled and efficient environment before entering the swing chamber, thereby effectively reducing its viscosity and improving its fluidity. The outlet of the medium heating channel is connected to the glue inlet of the pad, ensuring the immediacy and effectiveness of the heating effect and minimizing heat loss during transmission, thus ensuring that the medium entering the swing chamber is always in the optimal pumping state. This is particularly crucial for pumping high-viscosity media (such as glue), significantly improving the continuity and stability of pumping, reducing the risk of blockage and leakage due to excessively high medium viscosity, and thus improving the overall working efficiency and reliability of the swing pump for hot melt adhesives.

[0062] In some embodiments described above, a heating unit is proposed for heating the medium flowing into the oscillating chamber. This heating unit includes a heating pump body and a medium heating channel, the outlet of which is connected to the glue inlet of the pad. However, providing only a heating pump body and a medium heating channel without a specific heating structure may result in low medium heating efficiency and uneven temperature distribution. This is especially problematic for viscous media, making it difficult to ensure that the required fluidity is achieved and maintained before pumping, thus affecting the stability and continuity of pumping.

[0063] In this regard, this application further proposes that the heating pump body is provided with at least one heating chamber 93 and a heating element installed in the heating chamber 93.

[0064] Specifically, the heating chamber 93 is a specific space located inside the heating pump body 9. Its main function is to provide a protected and efficient heat-transferring area for the heating element. The heating chamber 93 can be designed in various shapes and sizes; for example, it can be an annular cavity surrounding the medium heating channel, or it can be an independent chamber adjacent to the medium heating channel. Its structural design aims to maximize the heat exchange efficiency between the heating element and the medium heating channel, ensuring that heat can be uniformly and efficiently transferred to the flowing medium.

[0065] The heating element is a device responsible for converting electrical energy or other forms of energy into heat energy. It is installed inside the heating chamber 93 and serves as the direct heat source for heating the medium. This heating element can take various forms; for example, it can be a heating rod 12, which has advantages such as simple structure, high heating efficiency, and convenient installation; it can also be a heating tube, a thick-film heater, a PTC heater, etc. Each of these elements has its own characteristics. For instance, a heating tube may have a longer service life and a more uniform surface temperature, while a thick-film heater may provide a faster thermal response and a more compact structure. The choice of heating element can be based on a comprehensive consideration of factors such as the characteristics of the medium, the required heating temperature, the heating power, and cost.

[0066] By employing the aforementioned technical solution, a heating chamber 93 is installed within the heating pump body 9, and a heating element is mounted thereon, providing a concentrated and efficient heating area for the medium. The heat generated by the heating element is effectively confined by the heating chamber 93 and transferred to the medium flowing through the heating channel, thereby ensuring that the medium is fully and uniformly preheated before entering the oscillating chamber. This significantly reduces the viscosity of the medium, improves its fluidity, and effectively avoids the problem of the medium solidifying or clogging the channel at low temperatures. Consequently, it ensures that the oscillating pump for hot melt adhesives can stably and continuously pump the medium, improving overall pumping efficiency and reliability.

[0067] In some embodiments described above, a oscillating pump for hot melt adhesive is proposed, comprising a heating unit, which further includes a heating pump body. The heating pump body has a heating chamber and a heating element installed within the heating chamber for heating the medium flowing into the oscillating chamber. However, in practical applications, especially when pumping viscous media (such as adhesives), the selection of the heating element is crucial to ensuring that the medium can be heated efficiently and uniformly to a suitable temperature, thereby reducing viscosity, improving flowability, and preventing blockage. An inappropriate selection of the heating element may lead to low heating efficiency, uneven temperature distribution, and even affect the long-term stable operation of the heating unit, thus impacting the overall performance of the oscillating pump and the continuity of adhesive dispensing.

[0068] In this application, the heating element is further described as a heating rod 12. The heating rod 12 is a common electric heating element, typically consisting of a metal shell (such as stainless steel or copper), an internal resistance wire (such as nichrome alloy wire), and an insulating and thermally conductive material (such as magnesium oxide powder) filling the space between the resistance wire and the shell. When current passes through the resistance wire, the wire heats up, and the heat is transferred through the insulating and thermally conductive material and the metal shell, thereby heating the surrounding medium. The heating rod 12 has advantages such as simple structure, mature manufacturing process, high thermal efficiency, high power density, convenient installation, and long service life. It can be designed in various shapes and sizes to adapt to different heating chamber 93 geometries and can achieve direct or indirect heating of the medium. In practical applications, the heating rod 12 can be directly inserted into the heating chamber 93 or transfer heat through close contact with the wall of the heating pump body 9.

[0069] In some embodiments described above, heating the medium flowing into the oscillating chamber is proposed to reduce its viscosity, improve its fluidity, thereby making it easier to pump and preventing the adhesive from solidifying and clogging the flow channel at low temperatures. However, in practice, how to effectively, stably, and securely connect the heated pump body and its internal medium heating flow channel to the main pump body to ensure the continuity of the medium heating flow channel, prevent leakage, and provide sufficient structural support is a technical problem that needs to be solved.

[0070] In this regard, this application further proposes that it also includes a flow guide plug 10 and a support frame 11. The heating pump body 9 is provided with a insertion cavity 91, the flow guide plug 10 is inserted into the insertion cavity 91, a portion of the medium heating flow channel is provided in the flow guide plug 10, and the support frame 11 connects the flow guide plug 10 and the pump body.

[0071] Specifically, the flow guide plug 10 is a component used to guide fluid flow, provide a seal, and also serve as a structural connection. It is typically made of high-temperature and corrosion-resistant materials and has precisely designed internal flow channels to ensure smooth flow of the medium from the heating pump body 9 to the swing chamber 21. The flow guide plug 10 can be manufactured as a single piece or assembled from multiple components, its shape and dimensions matching the insertion cavity 91 to achieve a tight fit and effective seal. For example, the flow guide plug 10 can be designed with O-ring grooves or tapered mating surfaces to enhance its sealing performance.

[0072] The support frame 11 is a component that provides mechanical support and structural stability. Its function is to securely fix the flow guide plug 10 to the pump body, preventing displacement or loosening of the flow guide plug 10 under the influence of medium pressure, temperature changes, or external vibration. The support frame 11 can be made of metal plates, rods, or cast structures, and its design should take into account the overall structure and stress conditions of the pump body to ensure the reliability and stability of the connection. For example, the support frame 11 can be fixed to the flow guide plug 10 and the pump body by bolts, welding, or other mechanical connections.

[0073] The insertion cavity 91 is an internal space or groove on the heating pump body 9 designed to accommodate the flow guide plug 10. The shape and size of this cavity are precisely matched to the outline of the flow guide plug 10 to achieve insertion and positioning of the flow guide plug 10. The inner wall of the insertion cavity 91 can be precision machined to ensure the fitting accuracy and sealing effect with the flow guide plug 10.

[0074] Part of the medium heating channel is the fluid passage contained inside the guide flow plug 10.

[0075] This channel is a component of the overall media heating flow path. It guides the medium heated by the heating pump body 9 from inside the heating pump body 9 to the inlet of the swing chamber 21. It also guides the glue continuously pumped from the overflow chamber to the subsequent glue outlet pipe for application by the edge banding machine. The guide plug 10 has a vertical through hole 101 in the middle and a connecting hole 102 at its end. A glue outlet 92 is formed at the top of the heating pump body 9, which connects to the glue inlet hole 31 of the pad 3 through the vertical through hole 101. The connecting hole 102 of the guide plug 10 connects to the overflow chamber 22 through the glue outlet hole 32 of the pad 3. The design of this flow path should ensure smooth media flow, reduce flow resistance, and potentially further promote uniform heating of the medium.

[0076] Through the above technical solution, the insertion and connection of the flow guide plug 10 and the insertion cavity 91 form a compact, continuous, and reliably sealed connection, effectively solving the fluid connection and sealing problems between the heating pump body 9 and the pump body. Simultaneously, the support frame 11 provides additional mechanical support for the flow guide plug 10, enhancing the stability of the connection between the entire heating unit and the pump body, and avoiding the risk of loosening or leakage due to medium pressure fluctuations or thermal expansion and contraction. This integrated design not only simplifies the overall structure of the pump body and reduces assembly difficulty, but also ensures that the heated medium can be stably and efficiently delivered to the swing chamber 21, thereby guaranteeing the continuous dispensing performance and operational reliability of the swing pump.

[0077] In some embodiments described above in this application, the core components of the oscillating pump include the pump body, the oscillating component, and the drive source. However, in practical applications, the effective integration and stable support of these key components are crucial considerations for ensuring normal pump operation, reducing assembly complexity, and improving the overall structural compactness. Without a unified mounting base, the components may experience relative displacement and alignment difficulties, thereby affecting transmission efficiency and pumping stability.

[0078] In this regard, this application further proposes a swing pump, which also includes a connecting plate 1, on which the pump body and the drive source are both mounted.

[0079] The connecting plate 1 is a structural component, typically plate-shaped or frame-shaped, used to provide a common, stable mounting base for fixing and supporting multiple independent mechanical or electrical components. Its material can be metal (such as steel or aluminum alloy) or high-strength engineering plastics to ensure sufficient rigidity and strength. The design of the connecting plate 1 should take into account the weight of the mounted components, vibrations during operation, and the required space layout. The pump body is fixed to the connecting plate 1 by bolts, welding, snap-fits, or other mechanical connections. This mounting method ensures the stability and accuracy of the pump body's position during operation, avoiding displacement caused by vibration or external forces, thus guaranteeing the normal operation of the oscillating component within the oscillating cavity. The drive source, such as a linear drive source, is also mounted to the connecting plate 1 by bolts, clamps, or other suitable fasteners. Mounting it to the same connecting plate 1 as the pump body helps maintain the alignment of the transmission connection between the drive source and the oscillating component, reduces transmission errors, and forms a more integrated overall structure.

[0080] Through the above technical solution, the pump body and drive source are jointly mounted on a connecting plate 1, forming a highly integrated and compact whole. This integrated installation method significantly improves the structural stability of the swing pump for hot melt adhesives, effectively avoiding possible relative displacement and alignment errors between the pump body and the drive source. This ensures that the drive source can accurately and stably drive the swing component to reciprocate within the swing cavity, ensuring the continuity and stability of media pumping. Furthermore, this design simplifies the overall assembly process of the swing pump for hot melt adhesives, reduces installation difficulty and time costs, and provides convenience for subsequent maintenance and repair.

[0081] In some embodiments described above in this application, a oscillating pump for hot melt adhesive is proposed, which drives the flow of medium by reciprocating oscillation of an oscillating member within an oscillating cavity. However, if there is a mismatch between the inner shape of the oscillating cavity and the oscillation trajectory of the oscillating member, the gap between the oscillating member and the cavity wall may be too large or uneven during the oscillation process, thereby affecting pumping efficiency, increasing the risk of medium leakage, and potentially accelerating component wear.

[0082] In this regard, this application further proposes that the inner shape of the swing cavity is adapted to the swing trajectory of the swing component.

[0083] Specifically, the "internal shape of the oscillating cavity" refers to the internal geometric contour of the cavity in which the oscillating component performs reciprocating oscillating motion. This internal shape can be designed according to the type of oscillating component, the oscillation angle, and the required pumping characteristics. For example, it can be a circular arc, an elliptical arc, or a complex irregular curve composed of multiple curve segments and straight segments. Its design goal is to provide a precise motion space for the oscillating component.

[0084] The "oscillation trajectory of the oscillating component" refers to the spatial path swept by the outer edge or key points of the oscillating component as it reciprocates within the oscillation cavity under the action of the drive source. This trajectory is typically an arc with the rotation center of the oscillating component as its center and the effective length of the oscillating component as its radius. Accurately determining the oscillation trajectory is crucial for achieving efficient pumping and good sealing.

[0085] "Matching" refers to the precise design and manufacturing of the inner cavity shape of the oscillating chamber so that it closely conforms to the trajectory boundaries swept by the oscillating component throughout its entire oscillation stroke. This fit aims to ensure a uniform and minimal working clearance between the oscillating component and the oscillating chamber wall, thereby optimizing pumping performance. This fit can be achieved through high-precision machining, precision casting, or advanced additive manufacturing techniques to guarantee dimensional accuracy.

[0086] Through the above technical solution, a precise match is achieved between the inner shape of the swing chamber and the swing trajectory of the swing component. This ensures that the swing component maintains a stable and minimal gap with the wall of the swing chamber throughout the swinging process. This optimized design significantly reduces the possibility of media leakage from the gap between the swing component and the chamber wall, thereby improving the pumping sealing performance and volumetric efficiency. Simultaneously, the uniformity of the gap avoids localized stress concentration and wear, effectively extending the service life of the swing component and the swing chamber. Furthermore, the precisely fitted inner cavity shape helps the media to be propelled more smoothly and continuously within the swing chamber, reducing pulsation during pumping and ensuring the continuity and stability of media output, making it particularly suitable for applications requiring high continuity of dispensing.

[0087] In some embodiments described above in this application, the oscillating member oscillates reciprocally within the oscillating cavity to drive the flow of the medium. However, if the structural form of the oscillating member is not properly selected, the fit clearance between it and the wall of the oscillating cavity may be difficult to control effectively, thereby increasing the risk of medium leakage and potentially affecting the continuous and stable delivery of the medium, and reducing pumping efficiency.

[0088] In this regard, this application further proposes that the swinging component is a swing baffle 4.

[0089] A oscillating baffle is a plate-like or blade-like structure whose main function is to reciprocate within an oscillating chamber to push and displace the medium. Oscillating baffles typically have a relatively thin thickness and a large surface area, allowing them to effectively separate the medium within the oscillating chamber and form a clear pushing interface. Their shape can be optimized according to the geometry of the oscillating chamber to ensure minimal and uniform clearance with the chamber wall throughout the entire oscillation stroke. The material selection for the oscillating baffle usually considers factors such as the properties of the medium (e.g., corrosiveness, viscosity), operating temperature, pressure, and wear resistance. Common materials include stainless steel, engineering plastics (e.g., PTFE, PEEK), or composite materials to ensure structural stability and sealing performance during long-term operation. The oscillating baffle is usually mounted on a rotating shaft via a fixed connection, and the shaft is rotatably supported on the pump body. This connection method ensures that the oscillating baffle can precisely oscillate with the shaft and effectively transmit the power from the drive source to the medium.

[0090] By employing the aforementioned technical solution, specifically designing the oscillating component as an oscillating baffle 4, this application effectively solves the aforementioned technical problems. The plate-like structure of the oscillating baffle 4 allows for precise matching with the inner shape of the oscillating cavity 21, thus ensuring that the gap between the oscillating baffle 4 and the cavity wall is designed to be relatively stable and minimized during oscillation. This tight fit significantly reduces the risk of media leakage from the gap between the oscillating baffle 4 and the inner cavity of the oscillating cavity 21, especially for viscous media such as glue, where the sealing effect is even more prominent. Furthermore, the pushing action of the oscillating baffle 4 within the oscillating cavity 21 creates a defined displacement space, ensuring that the media is continuously and effectively ejected, avoiding the problems of media backflow or discontinuous glue discharge that may occur in traditional pumping methods, thereby improving pumping efficiency and glue discharge stability. This design makes the pumping process more reliable, reduces maintenance requirements, and improves the overall performance of the equipment.

[0091] In some embodiments described above in this application, the drive source of the oscillating pump for hot melt adhesive is connected to the oscillating component via a transmission mechanism to drive the oscillating component to oscillate reciprocally within the oscillating chamber. However, in practice, if the transmission mechanism is directly located inside the pump body or in contact with the medium inside the pump body, the components of the transmission mechanism may be contaminated, corroded, or worn by the medium (such as viscous adhesive), increasing the complexity of the sealing and potentially affecting the transmission efficiency and pump reliability.

[0092] In this regard, this application further proposes that the rotating shaft 201 passes through the pump body, and the transmission mechanism is connected to the end of the rotating shaft that extends out of the pump body.

[0093] Specifically, the shaft is designed to completely pass through the pump body, allowing the oscillating component (e.g., an oscillating baffle) to reside within the oscillating cavity 21 inside the pump body, while at least one end of the shaft extends to the outside of the pump body. This through-type design requires an effective sealing structure at the point where the shaft passes through the pump body, such as an O-ring, mechanical seal, or lip seal, to ensure the sealing of the medium inside the pump body, prevent media leakage, and prevent external impurities from entering the pump body. The shaft is typically supported within the pump body using bearings to ensure smooth rotation, low friction, and good wear resistance.

[0094] The transmission mechanism is configured to connect to the end of the rotating shaft that extends outside the pump body. This connection can be achieved through mechanical means such as keyways, splines, set screws, or interference fits to ensure that the power from the drive source can be reliably transmitted to the rotating shaft. Positioning the transmission mechanism outside the pump body completely isolates it from the pumping medium, avoiding direct contact and potential influence of the medium on the transmission components.

[0095] The above technical solution effectively isolates the transmission mechanism from the media flow channel inside the pump body, preventing contamination, corrosion, and wear of the transmission mechanism components by viscous media, thereby significantly improving the reliability and service life of the transmission mechanism. Simultaneously, this external connection method simplifies the pump body's sealing structure design, requiring only effective sealing of the shaft penetration point, reducing the risk of seal failure and the possibility of media leakage. Furthermore, the external design of the transmission mechanism greatly facilitates pump assembly, maintenance, and repair, allowing for inspection and replacement of transmission components without disassembling the fluid contact parts inside the pump body, further improving the overall operating efficiency and maintainability of the pump.

[0096] The following example will provide a more detailed explanation of the above technical solution: In an industrial production scenario, such as a woodworking factory, the edges of wooden boards need to be sealed. This process requires precise and continuous application of a viscous adhesive. To address the common problems of adhesive leakage and discontinuous dispensing that occur when pumping such media using traditional plunger pumps, this embodiment provides a oscillating pump for hot melt adhesives.

[0097] The overall structure of the swing pump for hot melt adhesive is mounted on a connecting plate 1. One end of the connecting plate 1 is provided with a mounting groove, and a central block 2 is installed in the mounting groove. The central block 2 serves as the main body of the pump, and its interior forms a swing chamber 21 and a medium flow channel communicating with the swing chamber 21. Specifically, the medium flow channel is a long, narrow overflow chamber 22, both ends of which are connected to the swing chamber 21.

[0098] Inside the swing cavity 21, a swinging component, which in this embodiment is a swing baffle 200, is provided. The swing baffle 4 is fixedly connected to a rotating shaft, which is rotatably supported on the central block 2 and extends through the central block 2. The inner cavity shape of the swing cavity 21 is specially designed to match the swing trajectory of the swing baffle 4, which helps to minimize and maintain relative stability between the swing baffle 4 and the cavity wall during the swinging process.

[0099] To drive the swing baffle 4 to reciprocate, this embodiment employs a linear drive source, specifically a linear actuator (e.g., an electric cylinder). The telescopic output end of the linear actuator, i.e., the telescopic rod, is connected to one end of the rotating shaft 3 extending from the center block 2 via a transmission mechanism. This transmission mechanism includes a shaped connecting plate, one end of which is rotatably connected to the telescopic rod of the linear actuator, and the other end of which is rotatably connected to the rotating shaft. When the telescopic rod of the linear actuator extends or retracts, it drives the rotating shaft to rotate via the shaped connecting plate, thereby driving the swing baffle 4 to reciprocate within the swing cavity 21.

[0100] A pad 3 is provided on the top of the central block 2. An inlet hole 32 and an outlet hole 31 are formed on the pad. The inlet hole communicates with the swing chamber 21 for introducing glue; the outlet hole communicates with the overflow chamber 22 for discharging glue. In a preferred arrangement, the outlet hole is located at the middle of the length of the overflow chamber 22 to promote uniform glue discharge.

[0101] To ensure unidirectional flow of the adhesive and prevent backflow, a unidirectional flow-limiting component is provided on each side of the overflow chamber 22; in this embodiment, it is a steel ball check valve. Specifically, a placement groove 71 is formed on the side wall of the overflow chamber 22, and a steel ball is placed in the placement groove 71, which is connected to an overflow channel 72. The overflow channel 72 connects the overflow chamber 22 to the swing chamber 21. Under the action of medium pressure and its own weight, the steel ball can block or open the overflow channel 72, allowing only adhesive to flow from the swing chamber 21 into the overflow chamber 22, effectively preventing adhesive backflow.

[0102] Considering the viscous properties of the adhesive, the oscillating pump for this hot melt adhesive also includes a heating unit. This heating unit includes a heating pump body 9, which has an internal medium heating channel. The heating pump body 9 is mounted above the pad, and a flow guide plug 10 is inserted into its insertion cavity 91. The flow guide plug 10 contains a portion of the medium heating channel and communicates with the adhesive inlet and outlet holes of the pad. A heating element, such as a heating rod 12, is installed in the heating chamber 93 inside the heating pump body 9 to heat the adhesive flowing towards the oscillating cavity 21, reducing its viscosity and improving its flowability. The flow guide plug 10 is fixedly connected to the connecting plate 1 via a support frame 11, ensuring a stable connection and channel sealing between the heating pump body 9 and the center block 2.

[0103] The working principle of the oscillating pump used for this hot melt adhesive is as follows: The adhesive first enters the medium heating channel of the heating pump body 9 from an external supply source. As it flows through the heating pump body 9, the heat generated by the heating rod 12 preheats the adhesive, reducing its viscosity and increasing its fluidity. The preheated adhesive then enters the swing chamber 21 of the central block 2 through the guide plug 10 and the glue inlet hole of the pad.

[0104] The telescopic rod of the linear actuator reciprocates under the drive of the control unit, driving the rotating shaft and the swing baffle to swing back and forth within the swing cavity 21 via the irregular connecting plate. When the swing baffle 4 swings to one side, it pushes the glue in the swing cavity 21 towards the overflow cavity 22 on that side. Under pressure, the steel ball check valve on that side is opened, and the glue enters the overflow cavity 22 through the overflow channel 72 for temporary storage. At the same time, the glue inlet 81 continuously replenishes glue, filling the space on the other side of the swing baffle 4. When the linear actuator reverses its movement, and the swing baffle 4 swings to the other side, it pushes the newly flowing glue into the overflow cavity 22 on the other side.

[0105] Each time the linear actuator completes one extension and retraction cycle (one extension and one retraction), the swing baffle 4 completes one reciprocating swing, pushing glue once into each of the overflow chambers 22 on both sides, thus achieving two glue pushing actions. The glue collected in the overflow chamber 22 flows out from the overflow chamber under continuous pressure, passes through the glue outlet hole of the pad and the connecting hole 102 of the guide plug, and is finally delivered to the glue outlet pipe for use by the edge banding machine.

[0106] Compared to existing plunger pumps, this oscillating pump replaces the linear reciprocating motion of the plunger with the oscillating pushing action of the oscillating baffle 4. Because the inner shape of the oscillating chamber 21 matches the oscillating trajectory of the oscillating baffle 4, the gap between the oscillating baffle 4 and the chamber wall can remain relatively stable and minimized. This significantly reduces the periodic pressure impact on the sealing surface, thereby fundamentally reducing the risk of glue leakage from the gap between the oscillating baffle 4 and the inner cavity of the oscillating chamber 21. Furthermore, a single extension and retraction of the linear actuator 6 completes a full reciprocating oscillating cycle. Combined with the synergistic effect of the overflow chambers 22 on both sides and the one-way valve, the glue pushing action becomes more compact and continuous, effectively solving the problem of discontinuous glue dispensing in traditional plunger pumps and ensuring the uniformity and stability of glue output. The heating unit further ensures the good flowability of viscous glue during pumping.

[0107] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of 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 scope of protection of this application.

Claims

1. A swing pump for hot melt adhesives, characterized by The application relates to a pump, which comprises the following parts: a pump body, which is provided with a swing cavity and a medium flow channel communicating with the swing cavity; a swing member, which is swingably arranged in the swing cavity; a driving source, which is in driving connection with the swing member through a power output end, and is used for driving the swing member to reciprocally swing in the swing cavity so as to push the medium to flow in the medium flow channel; a heating unit, which is used for heating the medium flowing to the swing cavity.

2. The oscillating pump for hot melt adhesives according to claim 1, characterized in that The driving source is a linear driving source, and the telescopic output end of the linear driving source is connected with the swing member through a transmission mechanism.

3. The oscillating pump for hot melt adhesives according to claim 2, characterized in that The swing member is fixedly connected with a rotating shaft, the rotating shaft is rotatably supported on the pump body, and the transmission mechanism comprises a connecting rod, one end of the connecting rod is in rotary connection with the telescopic output end of the linear driving source, and the other end is in rotary connection with the rotating shaft.

4. The oscillating pump for hot melt adhesives according to claim 1, characterized in that The pump body comprises a center block, and the swing cavity and the medium flow channel are arranged in the center block.

5. The oscillating pump for hot melt adhesives according to claim 4, characterized in that The medium flow channel comprises an overflow cavity arranged in the center block, the overflow cavity is in strip shape and both ends of the overflow cavity are in communication with the swing cavity, the center block is provided with a glue outlet hole in communication with the overflow cavity and a glue inlet hole in communication with the swing cavity, and the glue outlet hole is located at the middle position of the length direction of the overflow cavity.

6. The oscillating pump for hot melt adhesives as set forth in claim 5, wherein The overflow cavity is provided with at least one one-way flow limiting member for limiting the backflow of the medium from the overflow cavity to the swing cavity.

7. The oscillating pump for hot melt adhesives according to claim 6, characterized in that The one-way flow limiting member is a steel ball one-way valve, a placing groove and an overflow channel are arranged on the side wall of the overflow cavity, the steel ball one-way valve comprises a steel ball, the steel ball is arranged in the placing groove and can block or open the overflow channel, and the overflow channel is in communication with the swing cavity and the overflow cavity.

8. The oscillating pump for hot melt adhesives according to claim 1, characterized in that The heating unit comprises a heating pump body, the heating pump body is provided with a medium heating flow channel, the outlet of the medium heating flow channel is in communication with the inlet of the swing cavity, a heating cavity is arranged in the heating pump body, and a heating element in the form of a heating rod is arranged in the heating cavity.

9. The oscillating pump for hot melt adhesives according to claim 8, characterized in that The pump further comprises a flow guide plug and a support frame, the heating pump body is provided with a plug-in cavity, the flow guide plug is plugged into the plug-in cavity, a part of the medium heating flow channel is arranged in the flow guide plug, and the support frame connects the flow guide plug and the pump body.

10. The oscillating pump for hot melt adhesives according to claim 1, characterized in that The inner cavity shape of the swing cavity is matched with the swing track of the swing member.

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