A packaging heat sealing apparatus

Abstract

The utility model discloses a kind of packaging heat sealing equipment, comprising: first unpowered roller mechanism, unwinding mechanism, stamping assembly, heat sealing assembly, index plate feeding assembly, blanking assembly, cold pressing assembly, pull together module, winding mechanism, second unpowered roller mechanism;The first unpowered roller mechanism is connected with unwinding mechanism and is placed below unwinding mechanism, for the film of unwinding mechanism to be sent to stamping assembly;The stamping assembly is placed downstream of first unpowered roller mechanism, for the film of first unpowered roller mechanism transmission is punched into the punching shape matched with injection molding medical product joint;Index plate feeding assembly is placed directly below heat sealing assembly, for the joint of upper injection molding medical product joint and is sent to heat sealing assembly;The heat sealing assembly is arranged downstream of stamping assembly, for the joint of film conveyed by stamping assembly and index plate feeding assembly loading is heat sealed cutting.

Description

Technical Field

[0001] This utility model relates to the field of medical product technology, and in particular to a packaging heat sealing device. Background Technology

[0002] In the field of medical device manufacturing, injection-molded medical products (such as infusion connectors, catheter interfaces, and syringe ports) typically require heat sealing at the port with a medical film to achieve aseptic sealing, prevent contamination, and ensure the product's functional integrity during use. Currently, this sealing process relies primarily on manual operation or semi-automated equipment. For example, the film is manually cut into approximate shapes and placed at the connector port, then sealed using a simple heat press or manual heat sealing tool. This traditional method has several significant drawbacks: First, the operation is inefficient. Manually placing the film and connectors relies on the worker's skill level, which can easily lead to positioning errors or inconsistent operations. Especially in mass production, capacity is limited by the speed of manual labor, typically only a few products can be processed per minute. At the same time, the high frequency of manual intervention increases labor costs and the risk of human error, such as film misalignment or uneven heat sealing pressure.

[0003] Secondly, the encapsulation quality is unstable. Existing equipment often lacks a precise punching mechanism, and the film shape is mostly determined by manual shearing or simple die stamping, resulting in poor matching with the connector port and easily causing bubbles, incomplete sealing, or edge burrs. These defects are particularly serious in medical products, which may lead to sterility failure or product recall. In addition, the heat sealing temperature and pressure control is rough, and there is a lack of real-time monitoring and feedback mechanisms, resulting in uneven heat melting or overheating damage to the film material.

[0004] Third, the integration of processes is low. In existing systems, processes such as unwinding, punching, heat sealing, cold pressing, unloading, and waste material rewinding are often scattered across multiple independent devices, requiring manual material handling multiple times. This not only prolongs the production cycle but also increases the risk of cross-contamination. Especially in cleanroom environments, manual contact can introduce microorganisms or particulate matter, making it difficult to meet the stringent aseptic standards of the medical industry (such as GMP requirements).

[0005] Fourth, film conveying and waste disposal present significant problems. Traditional conveying methods use ordinary rollers or manual traction, lacking effective tensioning and guiding mechanisms. This causes the film to easily deviate, wrinkle, or loosen during transport, affecting the accuracy of downstream processes. Waste winding often uses simple rollers, which are prone to edge forming, overlapping, or tension fluctuations when the roll diameter increases, even leading to film breakage, causing production interruptions and material waste.

[0006] Fifth, there is a lack of automated coordination. Existing equipment does not achieve synchronous linkage between its components. For example, there is no immediate cold pressing and shaping after heat sealing, which can easily cause shrinkage deformation or internal stress in the product during natural cooling, affecting dimensional accuracy and appearance flatness. At the same time, unloading relies on manual picking, which is inefficient and can easily damage the product.

[0007] These problems are particularly prominent in the field of injection-molded medical product packaging, because such products have extremely high requirements for sealing reliability, sterility, and dimensional consistency, and existing technologies are difficult to adapt to the needs of large-scale, continuous, and automated production. Therefore, there is an urgent need for an integrated, high-precision, and highly automated packaging heat-sealing equipment to solve the above-mentioned deficiencies and improve production efficiency and product quality. Utility Model Content

[0008] In view of the problems existing in the prior art, this utility model provides a packaging heat sealing device.

[0009] To achieve the above objectives, the technical solution of this utility model is as follows: This utility model provides a packaging heat sealing device, including: a first unpowered roller mechanism, an unwinding mechanism, a stamping assembly, a heat sealing assembly, an indexing plate feeding assembly, a unloading assembly, a cold pressing assembly, a pulling and closing module, a winding mechanism, and a second unpowered roller mechanism. The first unpowered roller mechanism is connected to the unwinding mechanism and is located below the unwinding mechanism, and is used to transport the film unwound by the unwinding mechanism to the stamping assembly; The stamping assembly is located downstream of the first unpowered roller mechanism and is used to punch the film conveyed by the first unpowered roller mechanism into a punching shape that matches the connector of the injection-molded medical product. The indexing plate feeding assembly is positioned directly below the heat sealing assembly and is used to feed the injection-molded medical product connector to the heat sealing assembly. The heat sealing component is located downstream of the stamping component and is used to heat seal and cut the joint between the film conveyed by the stamping component and the material fed by the indexing plate feeding component. The cold pressing component is mounted on the heat sealing component and is used to cold press the joint that has been heat-sealed by the heat sealing component. The feeding assembly is installed on the heat sealing assembly and placed on one side of the cold pressing assembly, and is used to remove the injection-molded medical product connector after it has been cold-pressed by the cold pressing assembly. The pulling module and the second unpowered roller mechanism are sequentially placed downstream of the heat sealing assembly. The pulling module is used to pull the film and guide it to the second unpowered roller mechanism. The winding mechanism is connected to the second unpowered roller mechanism and is used to wind up the film conveyed by the second unpowered roller mechanism.

[0010] Preferably, the first unpowered roller mechanism includes a passive roller tensioning assembly and a first unpowered roller assembly placed next to the passive roller tensioning assembly; The passive roller tensioning assembly includes a mounting frame, a plurality of first rollers arranged from top to bottom on the mounting frame, and two first fixing rings installed on each first roller; The first unpowered roller assembly includes a driven roller, a first guide roller and a second guide roller arranged side by side, a first belt, and a belt tensioning mechanism; The driven roller is located below and between the first guide roller and the second guide roller. The first belt is sequentially wound around the outer surfaces of the first guide roller, the driven roller, and the second guide roller. The first guide roller, the driven roller, the second guide roller, and the first belt together form a V-shaped conveyor channel for supporting and guiding materials. The belt tensioning mechanism includes a second belt connected to the end of the driven roller, a fixed end adjustment mechanism disposed at one end of the second belt, and a tensioning end adjustment mechanism disposed at the other end of the second belt. The fixed end adjustment mechanism is used to adjust the initial length of the second belt, and the tensioning end adjustment mechanism is used to adjust the tension of the second belt.

[0011] Preferably, the first unpowered roller mechanism further includes two opposing support frames, and the first guide roller and the second guide roller are rotatably mounted on the upper part of the support frames; the driven roller is rotatably mounted on the lower part of the support frame and is located below the middle of the first guide roller and the second guide roller; the support frame is an L-shaped support frame, and an oblong hole is also provided on the bottom surface of the L-shaped support frame, and a portal frame is also installed on the L-shaped support frame.

[0012] The fixed end adjustment mechanism includes a detachable L-shaped fixing plate mounted on a portal frame; the vertical part of the L-shaped fixing plate has multiple height mounting holes, one end of the second belt is fastened to a height mounting hole, and the second belt can be fixed to the L-shaped fixing plate by selecting different height mounting holes, thereby adjusting the initial length of the second belt.

[0013] The tensioning end adjustment mechanism includes a tensioning fixing plate, an elastic element, a pin, and an adjusting screw; the other end of the second belt is fixed to the bottom of the tensioning fixing plate, one end of the elastic element is connected to the upper part of the tensioning fixing plate, and the other end is connected to the pin; one end of the pin passes through the portal frame, and the adjusting screw is set on the pin to adjust the length of the pin passing through the portal frame.

[0014] The elastic element is a tension spring. The driven roller includes a driven shaft and a roller sleeved on the driven shaft; the end of the driven shaft is provided with a driven wheel, and the second belt is mounted on the driven wheel.

[0015] Preferably, the unwinding mechanism includes an unwinding motor, an air shaft connected to the output end of the unwinding motor, and a film roll disposed on the air shaft.

[0016] Preferably, the stamping assembly includes a stamping cylinder, a pressure block disposed at the output end of the stamping cylinder, and a punching die disposed below the pressure block.

[0017] Preferably, the heat sealing assembly includes a mounting plate, a heat sealing cylinder disposed on the mounting plate, a first guide assembly disposed at the four corners of the mounting plate, a connecting plate disposed at the bottom of the guide assembly, a heat cutting assembly and a heat sealing mechanism fixed on the connecting plate, a connecting rod connected to the four ends of the connecting plate, a spring sleeved on the connecting rod, and a pressure frame connected to the bottom of the connecting rod. The output end of the heat-sealing cylinder is connected to the connecting plate; the first guide assembly includes a first guide shaft and a first guide bearing sleeve sleeved on the first guide shaft; The hot cutting assembly includes a hot cutting cylinder and a hot cutting blade; the output end of the hot cutting cylinder passes through a connecting plate and is connected to the hot cutting blade; the heat sealing mechanism includes a second guide assembly passing through the connecting plate, a heating block installed at the bottom of the second guide assembly, a thermocouple and a heating rod passing through the heating block, and a heat sealing joint placed at the bottom of the heating block; the second guide assembly includes a second guide shaft and a second guide bearing sleeve sleeved on the second guide shaft; Preferably, the indexing plate feeding assembly includes a cam divider, an indexing plate disposed at the output end of the cam divider, and a plurality of tooling slots disposed on the indexing plate; the tooling slots contain injection-molded medical product connectors. Preferably, the cold pressing assembly includes an upper plate, a lower plate placed below the upper plate, a connecting rod with one end on the upper plate and the other end on the lower plate, and a second spring sleeved on the connecting rod.

[0018] Preferably, the pull-open module includes an X-axis linear module, a first pressing mechanism disposed at the output end of the X-axis linear module, and a second pressing mechanism disposed downstream of the first pressing mechanism; The first clamping mechanism includes a first clamping seat, a first clamping cylinder mounted on the first clamping seat, and a first pressure plate disposed at the output end of the first clamping cylinder; the first clamping seat is disposed on the output end of the X-axis linear module; the first pressure plate is disposed opposite to the base plate of the first clamping seat; The second pressing mechanism includes a second pressing seat, a second pressing cylinder mounted on the second pressing seat, and a second pressure plate disposed at the output end of the second pressing cylinder; the second pressure plate is disposed opposite to the bottom plate of the second pressing seat.

[0019] The feeding assembly includes a feeding cylinder and a suction nozzle located at the output end of the feeding cylinder.

[0020] Preferably, the winding mechanism includes a servo motor, a lead screw disposed at the output end of the servo motor, sliding components disposed on both sides of the lead screw, a sliding plate disposed on the sliding components and connected to the lead screw, a winding motor disposed on the sliding plate, and a winding air shaft disposed at the output end of the winding motor.

[0021] Preferably, the second unpowered roller mechanism includes two opposing vertical plates, a plurality of second rollers arranged from top to bottom on the vertical plates, and two second fixing rings installed on each second roller.

[0022] The technical solution of this utility model has the following beneficial effects: This utility model adopts a highly automated process throughout: through the organic integration of the unwinding mechanism, stamping component, heat sealing component, indexing plate feeding component, cold pressing component, unloading component, stretching module and winding mechanism, a fully automated process from film unwinding, punching, heat sealing, cold pressing to unloading and winding is realized, reducing manual intervention and improving production efficiency, which can reach 3-5 times that of the existing manual method.

[0023] This utility model provides stable and reliable film conveying throughout the entire process: the first unpowered roller mechanism adopts a V-shaped conveying channel and a two-stage tensioning mechanism to ensure high film alignment accuracy and constant tension, avoiding deviation or wrinkles; the second unpowered roller mechanism further stabilizes waste material transmission and reduces material damage through multi-layer rollers and fixed rings for auxiliary guidance.

[0024] This invention boasts high precision and efficiency in punching: the punching assembly includes a pressure block driven by a punching cylinder and a lower punching die, enabling precise punching of the film into a shape perfectly matching the injection-molded medical connector, with dimensional tolerances controlled at the micrometer level and smooth, burr-free edges. Positioned downstream of the first unpowered roller mechanism, this assembly directly receives the stably conveyed film, reducing intermediate transfer steps and improving punching consistency and production cycle time. Compared to traditional manual cutting, efficiency is increased by 2-3 times.

[0025] This invention achieves precise coordination between heat sealing and cutting actions: Efficient coordination of heat sealing and cutting: The heat sealing component is driven by the heat sealing cylinder to synchronously drive the heat cutting component, heat sealing mechanism and pressure frame to move. The film is first pressed and then heat sealed. Finally, the heat cutting cylinder independently drives the heat cutting blade to cut the joint, ensuring uniform heat sealing and accurate cutting position, improving sealing strength, significantly reducing the risk of bubbles, leaks and edge burrs, and improving the sterility reliability and appearance quality of medical products.

[0026] This invention features highly efficient and precise feeding and multi-station switching: the indexing plate feeding assembly drives the indexing plate and multiple tooling slots via a cam divider, achieving intermittent and precise rotation of the injection-molded medical product connector, sequentially positioning the product to the heat sealing station, cold pressing station, and unloading station. The "stop-start-stop" characteristic of the cam divider ensures complete stillness at each station, facilitating precise operation. The overall cycle time is 3-4 seconds per piece, improving production continuity and multi-station coordination compared to traditional linear conveyors.

[0027] This invention offers superior cold-pressing shaping results: the cold-pressing component descends synchronously with the heat-sealing cylinder, utilizing a spring buffer to provide constant cold-pressing pressure for rapid cooling and curing of the heat-sealed joint. This design effectively eliminates shrinkage deformation and internal stress caused by thermal stress, ensuring the flatness and dimensional stability of the product's ends. Compared to processes without cold pressing, the product deformation rate is significantly reduced, improving the functional reliability and batch consistency of medical products.

[0028] This invention features automated and clean material handling: the material handling cylinder of the material handling component drives the suction nozzle, enabling contactless suction and unloading of the cold-pressed finished product, avoiding damage and contamination caused by manual handling. This component is installed on the heat-sealing component, positioned to one side of the cold-pressing component, and coordinates with the indexing plate feeding component to ensure precise alignment of the material handling station, improving automation and cleanliness, making it suitable for medical cleanroom environments.

[0029] This invention provides a smooth and damage-free film traction system: the pulling module adopts a "moving clamp + fixed clamp" intermittent traction method, combined with the X-axis linear module and the lateral swing winding of the winding mechanism, to ensure that the waste material edge is flat and wrinkle-free during winding, reducing material waste and improving resource utilization; at the same time, the film tension is stable, preventing breakage or displacement and extending the continuous operation time of the equipment.

[0030] This utility model provides neat and efficient waste material winding: the winding mechanism uses a servo motor to drive a lead screw and sliding assembly, causing the sliding plate to drive the winding motor and winding air shaft in a lateral reciprocating motion, achieving uniform edge distribution of waste material without ridges or overlaps. This mechanism coordinates with the unwinding motor of the unwinding mechanism to form a closed-loop tension control, automatic roll diameter compensation, high winding quality, and facilitates subsequent unwinding and waste material recycling, reducing material waste.

[0031] In summary, through the organic integration of the above structures, this utility model achieves fully automated and high-precision operation of injection-molded medical products and film encapsulation, significantly improving production efficiency, product quality, and aseptic reliability. It has a compact structure, is easy to maintain, is suitable for large-scale medical device production, and has broad application prospects and economic value. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the first unpowered roller assembly of this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the structure of the first unpowered roller assembly of this utility model. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the first unpowered roller assembly of this utility model. Figure 3 ; Figure 5 This is a schematic diagram of the structure of the stamping assembly of this utility model. Figure 1 ; Figure 6 This is a schematic diagram of the structure of the stamping assembly of this utility model. Figure 2 ; Figure 7 This is a schematic diagram of the structure of the heat-sealing component of this utility model. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the heat-sealing component of this utility model. Figure 2 ; Figure 9 This is a schematic diagram of the structure of the heat-sealing component of this utility model. Figure 3 ; Figure 10 This is a schematic diagram of the pull-open module of this utility model; Figure 11 This is a schematic diagram of the pull-open module of this utility model; Figure 12 This is a schematic diagram of the winding mechanism of this utility model. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Reference Figures 1 to 12This utility model provides a heat sealing device for the encapsulation of injection-molded medical products and films. The device is mainly used for heat sealing of the joints and films of injection-molded medical products. It includes a first non-powered roller mechanism 20, an unwinding mechanism 30, a stamping assembly 40, a heat sealing assembly 50, an indexing plate feeding assembly 60, a feeding assembly 70, a cold pressing assembly 80, a pulling and closing module 90, a winding mechanism 100, and a second non-powered roller mechanism 110. The first unpowered roller mechanism 20 is connected to and positioned below the unwinding mechanism 30, and is used to convey the film unwound from the unwinding mechanism 30 to the stamping assembly 40. The stamping assembly 40 is positioned downstream of the first unpowered roller mechanism 20, and is used to punch the film conveyed by the first unpowered roller mechanism 20 into a punched shape that matches the injection-molded medical product connector. The indexing plate feeding assembly 60 is positioned directly below the heat sealing assembly 50, and is used to feed the injection-molded medical product connector and convey it to the heat sealing assembly 50. The heat sealing assembly 50 is positioned downstream of the stamping assembly 40, and is used to heat seal the film conveyed by the stamping assembly 40 and the connector fed by the indexing plate feeding assembly 60. Heat sealing and cutting; the cold pressing component 80 is disposed on the heat sealing component 50 and is used to cold press the joint that has been heat sealed by the heat sealing component 50; the unloading component 70 is installed on the heat sealing component 50 and placed on one side of the cold pressing component 80, and is used to remove the injection-molded medical product joint after being cold-pressed by the cold pressing component 80; the pulling module 90 and the second unpowered roller mechanism 110 are sequentially placed downstream of the heat sealing component 50, the pulling module 90 is used to pull the film and guide the film to the second unpowered roller mechanism 110; the winding mechanism 100 is connected to the second unpowered roller mechanism 110 and is used to wind up the film conveyed by the second unpowered roller mechanism 110.

[0039] Reference Figures 2 to 4 The first unpowered roller mechanism 20 includes a passive roller tensioning assembly 21 and a first unpowered roller assembly 22 placed next to the passive roller tensioning assembly 21. The passive roller tensioning assembly 21 includes a mounting frame, a plurality of first rollers arranged from top to bottom on the mounting frame, and two first fixing rings installed on each first roller for tensioning and guiding the film, wherein the passive roller tensioning assembly 21 plays a tensioning role.

[0040] The first unpowered roller assembly 22 includes: a driven roller 1, a first guide roller 2 and a second guide roller 3 arranged side by side, a first belt, and a belt tensioning mechanism 5.

[0041] In this embodiment, the axes of the first guide roller 2 and the second guide roller 3 are parallel to each other, and the axis of the driven roller 1 is also parallel to the axes of the first guide roller 2 and the second guide roller 3. In a plane perpendicular to the axes of each roller, the driven roller 1 is located below the middle of the first guide roller 2 and the second guide roller 3, thereby forming a stable triangular arrangement in space.

[0042] The first belt is a ring-shaped belt that is sequentially wound around the outer surfaces of the first guide roller 2, the driven roller 1, and the second guide roller 3. Through this winding arrangement, the first guide roller 2, the driven roller 1, the second guide roller 3, and the first belt together form a V-shaped conveyor channel for supporting and guiding materials. When materials are placed in the V-shaped conveyor channel, both sides of the materials contact the belt segments of the first belt between the first guide roller 2 and the driven roller 1, and between the second guide roller 3 and the driven roller 1, respectively. Thus, under the combined force of the belt segments on both sides, the materials are lifted, guided, and centered.

[0043] The belt tensioning mechanism includes a second belt 6 connected to the end of the driven roller 1, a fixed-end adjustment mechanism 7 disposed at one end of the second belt 6, and a tensioning-end adjustment mechanism 8 disposed at the other end of the second belt 6. The second belt 6 is preferably a flexible strip, a portion of which is wound around the driven pulley at the end of the driven roller 1. By changing the effective length and tension of the second belt 6, the force acting on the driven roller 1 can be adjusted, thereby adjusting the tension of the first belt in accordance with the installation position of the driven roller 1. Specifically, the fixed-end adjustment mechanism 7 is used to adjust the initial length of the second belt 6 in stages, and the tensioning-end adjustment mechanism 8 is used to finely adjust the tension of the second belt 6, thereby adapting to the tension requirements of the first belt under different working conditions.

[0044] In this embodiment, the unpowered roller assembly is typically positioned between the preceding feeding mechanism and the subsequent processing station. The assembly itself does not have a drive motor. When the preceding feeding mechanism pushes or conveys material into the V-shaped conveyor channel, the friction between the material and the first belt drives the first belt to move, thereby driving the driven roller 1, the first guide roller 2, and the second guide roller 3 to rotate, achieving unpowered conveying and centering guidance of the material. The preceding feeding mechanism is at least one of a chain conveyor, a belt conveyor, or a push rod conveyor. The unpowered roller assembly is arranged between the preceding feeding mechanism and the subsequent processing station to center the material from the preceding feeding mechanism and stably guide it to the subsequent processing station.

[0045] In this embodiment, the unpowered roller assembly further includes two opposing support frames 10. The two ends of the first guide roller 2 and the second guide roller 3 are rotatably mounted on the upper part of the support frame 10 via rotating shafts, i.e., the upper region of the two support frames 10. The two ends of the driven roller 1 are rotatably mounted on the lower region of the support frame 10 via driven rotating shafts, so that the driven roller 1 is located in the middle and lower part of the cross section of the first guide roller 2 and the second guide roller 3.

[0046] Preferably, the support frame 10 is an L-shaped support frame with several oblong holes 101 extending along the installation direction on its bottom surface. These holes are used to fix the L-shaped support frame 10 onto the external equipment frame with anchor bolts. The oblong holes 101 provide a certain adjustment margin for the L-shaped support frame 10 during installation, facilitating fine-tuning of the overall position of the unpowered roller assembly according to the site conditions, thereby improving the docking accuracy with the preceding feeding mechanism and subsequent workstations. A portal frame 11 is also installed on each L-shaped support frame 10. The portal frame 11 preferably includes two vertical column sections and one horizontal connecting section, forming an overall portal structure, which provides an installation reference and support for the fixed end adjustment mechanism 7 and the tensioning end adjustment mechanism 8.

[0047] In this embodiment, the fixed end adjustment mechanism 7 includes an L-shaped fixing plate 12 detachably mounted on the portal frame 11. The L-shaped fixing plate 12 includes a vertical portion extending in the vertical direction and a horizontal portion extending in the horizontal direction. The vertical portion has multiple height mounting holes 121 spaced apart in the vertical direction. One end of the second belt 6 is fastened to a certain height mounting hole 121 by bolts, nuts, or other fasteners. During installation, different height mounting holes 121 can be selected as needed to change the effective length of the second belt 6, achieving graded adjustment of the initial length of the second belt 6. This multi-hole fixing method allows for adaptation to different specifications and tension strokes without replacing the second belt 6, improving the applicability of the unpowered roller assembly. The L-shaped fixing plate 12 adopts a detachable installation structure, for example, by bolting to the horizontal connecting section or vertical column section of the portal frame 11. When it is necessary to replace the second belt 6 of a different specification or to maintain the fixed end structure, only the L-shaped fixing plate 12 needs to be removed, making operation convenient and maintenance costs low.

[0048] In this embodiment, the tensioning end adjustment mechanism 8 includes a tensioning fixing plate 13, an elastic element 14, a pin 15, and an adjusting screw 16. The other end of the second belt 6 is fixed to the bottom of the tensioning fixing plate 13, for example, by clamping and fixing the second belt 6 to the lower surface of the tensioning fixing plate 13 using a pressure plate and bolts.

[0049] One end of the elastic element 14 is connected to the upper part of the tensioning and fixing plate 13, and the other end is connected to the pin 15. The elastic element 14 is preferably a tension spring. One end of the spring can be fixed to the connecting hole or connecting ear plate on the upper part of the tensioning and fixing plate 13 by means of hooks, ear plates, etc., and the other end is fixed to the end of the pin 15 by hooks or connecting rings, so that the tensioning and fixing plate 13 will have an upward tensioning tendency under the pulling force of the elastic element 14.

[0050] One end of the pin 15 passes through the portal frame 11. An adjusting screw 16 is mounted on the pin 15, preferably a nut or an adjusting block with internal threads. The adjusting screw 16 is threadedly connected to the pin 15 to limit the extension length of the pin 15 relative to the portal frame 11. By rotating the adjusting screw 16, the effective length of the pin 15 passing through the portal frame 11 can be changed, thereby changing the tension of the elastic element 14 and achieving fine adjustment of the tension of the second belt 6.

[0051] When the adjusting screw 16 is rotated away from the portal frame 11, the pin 15 moves outward under the action of the adjusting screw 16, increasing the tension of the elastic element 14 and thus increasing the tension of the second belt 6. Conversely, when the adjusting screw 16 is rotated towards the portal frame 11, the extension length of the pin 15 relative to the portal frame 11 decreases, reducing the tension of the elastic element 14 and thus decreasing the tension of the second belt 6. Utilizing the elasticity of the elastic element 14, the tension of the second belt 6 can be automatically compensated for when the length of the first belt changes slightly due to wear, aging, or temperature variations. This ensures that the first belt remains within a relatively stable tension range, guaranteeing a stable and reliable transmission effect for the V-shaped conveyor channel.

[0052] In this embodiment, the driven roller 1 includes a driven shaft and a roller body sleeved on the driven shaft. The two ends of the driven shaft are rotatably mounted on the lower part of the support frame 10. A driven wheel is provided at the end of the driven shaft. The second belt 6 is wound around the outer circumference of the driven wheel. Under the combined action of the fixed end adjustment mechanism 7 and the tensioning end adjustment mechanism 8, the wrap angle and tension of the second belt 6 on the outer circumference of the driven wheel can be adjusted as needed. When the preceding feeding mechanism drives the material to move in the V-shaped conveyor channel, the first belt drives the driven roller 1 to rotate, the driven shaft rotates accordingly, and the driven wheel rotates synchronously, so that the second belt 6 undergoes a slight displacement relative to the portal frame 11. Under the action of the elastic element 14, dynamic tension is achieved, ensuring the working stability of the entire unpowered roller assembly during operation.

[0053] With the above structural arrangement, the unpowered roller assembly of this embodiment has the following advantages: On the one hand, the V-shaped conveying channel formed by the first guide roller 2, the second guide roller 3 and the driven roller 1 allows the material to naturally move towards the bottom of the V-shape during the conveying process, which has good self-centering and centering guidance functions, and reduces the situation of material deviation and tilting. On the other hand, the two-stage tensioning structure consisting of the second belt 6, the fixed end adjustment mechanism 7, and the tensioning end adjustment mechanism 8 can adjust the belt tension within a wide range, and the elastic element 14 can automatically compensate for the belt elongation, reducing frequent manual adjustments and improving the reliability and maintenance convenience of the whole machine.

[0054] Furthermore, the unwinding mechanism 30 includes an unwinding motor, an air shaft connected to the output end of the unwinding motor, and a film roll 33 mounted on the air shaft. During operation, the unwinding motor drives the air shaft to rotate, thereby feeding the film roll 33 and conveying the film to the first unpowered roller mechanism 20.

[0055] Reference Figures 5 to 6 The stamping assembly 40 includes a stamping cylinder 41, a pressure block 42 connected to the piston rod end of the stamping cylinder 41, and a punching die 43 fixedly installed below the pressure block 42. The punching die 43 includes an upper die (which moves with the pressure block 42) and a lower die. The shape of the upper die's cutting edge perfectly matches the contour of the injection-molded medical product connector. During operation, at the moment the film is precisely positioned and pauses, the stamping cylinder 41 rapidly descends, driving the pressure block 42 and the upper die to press down at high speed, precisely closing with the lower die, and punching the single-layer film into a shape completely consistent with the connector port in one go. After punching, the stamping cylinder 41 quickly returns to its original position, and the punched film continues to be conveyed forward, waiting for the heat sealing assembly 50 at the next station to precisely cover it onto the injection-molded medical product connector. The entire stamping cycle is short and the positioning accuracy is high, ensuring that the dimensional and positional tolerances of each punched film meet the requirements of medical-grade packaging.

[0056] Reference Figures 7 to 9 The heat-sealing assembly 50 includes a mounting plate 51, a heat-sealing cylinder 52 mounted on the mounting plate 51, first guide assemblies 53 located at the four corners of the mounting plate 51, a connecting plate 54 located at the bottom of the first guide assemblies 53, a heat-cutting assembly 55 and a heat-sealing mechanism 56 fixed on the connecting plate 54, connecting rods 57 connected to the four ends of the connecting plate 54, springs 58 sleeved on the connecting rods 57, and a pressure frame 59 connected to the bottom of the connecting rods 57. The output end of the heat-sealing cylinder 52 is connected to the connecting plate 54. The first guide assembly 53 includes a first guide shaft and a first guide bearing sleeve sleeved on the first guide shaft. The heat-cutting assembly 55 includes a heat-cutting cylinder 551 and a heat-cutting cutter 552, the output end of the heat-cutting cylinder 551 passing through the connecting plate 54 and connected to the heat-cutting cutter 552. The heat-sealing mechanism 56 includes a second guide assembly 561 passing through a connecting plate 54, a heating block 562 installed at the bottom of the second guide assembly 561, a thermocouple 563 and a heating rod 564 passing through the heating block 562, and a heat-sealing joint 565 located at the bottom of the heating block 562. The heat-sealing joint 565 has a groove 566 adapted to the joint of the injection-molded medical product. The second guide assembly 561 includes a second guide shaft and a second guide bearing sleeve sleeved on the second guide shaft.

[0057] During operation, once the indexing plate feeding assembly 60 precisely rotates the tooling slot carrying the injection-molded medical product connector to directly below the heat-sealing station, the heat-sealing cylinder 52 rapidly descends, causing the connecting plate 54 to drop as a whole. Four first guide components 53 ensure smooth, unbiased movement. Simultaneously, the connecting rod 57 moves downwards, and the pressure frame 59 first contacts the film, pressing the film sheet punched by the stamping assembly 40 flat and firmly onto the injection-molded medical product connector. Subsequently, the heat-sealing mechanism 56 continues to descend, and the heat-sealing joint 565 at the bottom of the heating block 562 precisely aligns with and wraps the injection-molded medical product connector. The product connector, with heating rod 564 preheated to the set temperature (monitored and controlled in real time by thermocouple 563), achieves a reliable heat-sealing between the film and the connector under the combined action of pressure and high temperature. After a period of pressure and heat preservation, the heat-sealing cylinder 52 slightly lifts to detach the heat-sealed connector 565 from the product. The heat-cutting cylinder 551 then actuates, driving the heat-cutting cutter 552 to quickly descend and precisely cut off the waste edge at the connection with the finished product. Finally, the heat-sealing cylinder 52 drives the entire execution unit to return to its original position, and the spring 58 assists the pressure frame 59 to quickly detach, awaiting the next cycle. This structure, through the sequential actions of the pressure frame 59 pressing first, the heat-sealed connector 565 precisely heat-sealed, and the heat-cutting cutter 552 independently cutting, ensures uniform heat-sealing pressure, precise temperature control, and accurate cutting position, significantly improving the yield and production efficiency of medical-grade packaging.

[0058] Reference Figure 10 The indexing plate feeding assembly 60 includes a cam divider 61, an indexing plate 62 disposed at the output end of the cam divider 61, and multiple tooling slots 63 disposed on the indexing plate 62. Injection-molded medical product connectors 64 are placed in the tooling slots 63. During operation, the cam divider 61 drives the indexing plate 62 to rotate, thereby causing the tooling slots 63 to rotate. The injection-molded medical product connectors 64 in the tooling slots 63 are sequentially rotated to the heat-sealing station of the heat-sealing assembly 50 for heat sealing, to the cold-pressing station of the cold-pressing assembly 80 for cold pressing, and finally to the unloading station of the unloading assembly 70 for unloading.

[0059] Furthermore, the cold pressing assembly 80 includes an upper plate 81, a lower plate 82 located directly below the upper plate 81, connecting rods 83 fixed at both ends to the upper plate 81 and the lower plate 82 respectively, and a second spring sleeved on each connecting rod 83. The upper plate 81 is fixedly installed on the connecting plate 54 of the heat sealing assembly 50, so that the entire cold pressing assembly 80 rises and falls synchronously with the heat sealing assembly 50. During operation, when the heat sealing assembly 50 descends to perform the heat sealing action, the cold pressing assembly 80 descends synchronously. The lower plate 82, under the elastic support of the second spring, first contacts the injection-molded medical product connector 64 located at the cold pressing station and applies uniform and controllable cold pressing pressure to quickly cool and shape the connector that has just completed heat sealing, so that the hot melt area quickly solidifies and shrinks evenly, avoiding internal stress or deformation caused by temperature gradient. The second spring provides stable buffering and constant pressure, ensuring that the cold pressing process is gentle and the pressure is consistent. After the heat sealing process is completed, the heat sealing assembly 50 returns to its original position, and the cold pressing assembly 80 is lifted accordingly. The lower plate 82 quickly detaches from the product under the action of the second spring, completing one cold pressing cycle. This cold pressing assembly 80 fully utilizes the drive stroke of the heat sealing assembly 50 to achieve synchronous operation, eliminating the need for an additional independent drive source. Its simple structure and reliable operation, combined with the heat sealing process, effectively improve the appearance flatness and dimensional stability of the heat-sealed joint, meeting the high-quality requirements of medical products. The unloading assembly 70 includes an unloading cylinder and a suction nozzle located at the output end of the unloading cylinder. During operation, when the cold-pressed injection-molded medical product joint 64 rotates to the unloading station, the unloading cylinder drives the suction nozzle to pick up and unload the injection-molded medical product joint.

[0060] Reference Figure 11 The pull-open module 90 includes an X-axis linear module 91, a first pressing mechanism 92 fixed to the output end of the X-axis linear module 91, and a second pressing mechanism 93 located downstream of the first pressing mechanism 92.

[0061] The first pressing mechanism 92 includes a first pressing seat 921, a first pressing cylinder 922 mounted on the first pressing seat 921, and a first pressure plate 923 connected to the output end of the first pressing cylinder 922; the first pressing seat 921 is fixedly connected to the slider of the X-axis linear module 91, and the first pressure plate 923 is disposed opposite to the bottom plate of the first pressing seat 921 to form an openable film clamping opening.

[0062] The second pressing mechanism 93 includes a second pressing seat, a second pressing cylinder mounted on the second pressing seat, and a second pressure plate connected to the output end of the second pressing cylinder; the second pressure plate is disposed opposite to the bottom plate of the second pressing seat, and similarly forms an openable film clamping opening.

[0063] The working process is as follows: After heat sealing and cutting are completed, the first clamping cylinder 922 is activated, driving the first pressure plate 923 to press down and firmly clamp the film onto the base plate of the first clamping seat 921; then the X-axis linear module 91 moves forward at high speed, driving the entire first clamping mechanism 92 to move precisely a set distance along the positive X-axis, thereby pulling the film forward synchronously; after moving into position, the second clamping cylinder is activated, driving the second pressure plate to press down and press the film onto the base plate of the second clamping seat; then the first clamping cylinder 922 is released, the first pressure plate 923 is lifted, the X-axis linear module 91 quickly returns, and the first clamping mechanism 92 returns to its initial position; after the first clamping mechanism 92 is reset, the first clamping cylinder 922 presses the film again and enters the next cycle. The second clamping mechanism 93 serves as a fixed clamping point throughout the process, cooperating with the moving first clamping mechanism 92 to form a typical "handshake" intermittent traction. This ensures the film remains taut during pauses at the heat-sealing station, while simultaneously achieving precise step-by-step feeding. The waste material edges are flat and wrinkle-free, laying the foundation for stable subsequent winding. The pull-and-close module 90 has a compact structure, smooth operation, and uniform traction force, effectively avoiding film scratches and tension fluctuations that are prone to occur with traditional roller traction. This significantly improves the stability of the entire machine and the reliability of the medical-grade packaging process.

[0064] In this embodiment, the second unpowered roller mechanism 110 includes two opposing vertical plates, multiple second rollers arranged from top to bottom and rotatably mounted between the two vertical plates, and two second fixing rings fitted at both ends of each second roller. The inner diameter of the second fixing ring is precisely matched with the outer diameter of the second roller, and the outer flange can effectively prevent the film from shifting to both sides during the conveying process, ensuring that the film always runs straight along the central path. This mechanism itself is not equipped with an active drive, but relies entirely on the friction force generated by the traction of the upstream pulling module 90 to drive each second roller to rotate synchronously, achieving low-resistance and smooth film auxiliary conveying, while also playing a good role in flattening and guiding the film, avoiding wrinkles or deviations, and providing a flat, tension-free waste edge for the subsequent winding mechanism 100, ensuring neat winding and clean edges.

[0065] Reference Figure 12The winding mechanism 100 includes a servo motor 101, a lead screw 102 connected to the output end of the servo motor 101, a sliding assembly 103 arranged parallel to both sides of the lead screw 102, a sliding plate 104 that is driven by the lead screw 102 through a nut seat and can reciprocate on the sliding assembly 103, a winding motor 105 fixed on the sliding plate 104, and a winding air shaft 106 directly driven by the winding motor 105 through a coupling. The sliding assembly 103 consists of two high-precision slide rails and a corresponding slider, ensuring the smoothness and high repeatability of the sliding plate 104 during lateral movement. During operation, the winding motor 105 drives the winding air shaft 106 to rotate at a constant speed or according to the tension feedback speed change, continuously winding the waste film edge from the second unpowered roller mechanism 110; at the same time, the servo motor 101 can drive the lead screw 102 to rotate in real time according to the roll diameter, so that the sliding plate 104 drives the entire winding air shaft 106 to move slowly back and forth along the axial direction, so as to achieve uniform and flat arrangement of waste edges on the roll, avoiding the phenomenon of "edge" or "overlap", ensuring that the winding roll diameter is neat and the edges are aligned, which facilitates subsequent unwinding and waste disposal.

[0066] The overall workflow of this utility model is as follows: the unwinding mechanism 30 releases the film, which is then conveyed to the stamping assembly 40 via the first unpowered roller mechanism 20 for punching; the punched film is conveyed to the heat sealing assembly 50, where it is heat-sealed and cut with the injection-molded medical product connector fed by the indexing plate feeding assembly 60; after heat sealing, it is cold-pressed by the cold pressing assembly 80, and the finished product is unloaded by the unloading assembly 70; the remaining waste film is pulled by the pulling module 90 and guided by the second unpowered roller mechanism 110 to the winding mechanism 100 for winding. This equipment has a compact structure and a high degree of automation, improving the efficiency and quality of injection-molded medical products and film encapsulation.

[0067] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and based on the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A packaging heat sealing device, characterized in that, include: First unpowered roller mechanism, unwinding mechanism, stamping assembly, heat sealing assembly, indexing plate feeding assembly, unloading assembly, cold pressing assembly, drawing and closing module, winding mechanism, and second unpowered roller mechanism; The first unpowered roller mechanism is connected to the unwinding mechanism and is located below the unwinding mechanism, and is used to transport the film unwound by the unwinding mechanism to the stamping assembly; The stamping assembly is located downstream of the first unpowered roller mechanism and is used to punch the film conveyed by the first unpowered roller mechanism into a punching shape that matches the product joint. The indexing plate feeding component is located directly below the heat sealing component and is used to feed the product joint and transport it to the heat sealing component. The heat sealing component is located downstream of the stamping component and is used to heat seal and cut the joint between the film conveyed by the stamping component and the material fed by the indexing plate feeding component. The cold pressing component is mounted on the heat sealing component and is used to cold press the joint that has been heat-sealed by the heat sealing component. The feeding component is installed on the heat sealing component and placed on one side of the cold pressing component, and is used to remove the product joint after it has been cold-pressed by the cold pressing component. The pulling module and the second unpowered roller mechanism are sequentially placed downstream of the heat sealing assembly. The pulling module is used to pull the film and guide it to the second unpowered roller mechanism. The winding mechanism is connected to the second unpowered roller mechanism and is used to wind up the film conveyed by the second unpowered roller mechanism.

2. The packaging heat sealing equipment according to claim 1, characterized in that, The first unpowered roller mechanism includes a passive roller tensioning assembly and a first unpowered roller assembly placed next to the passive roller tensioning assembly; The passive roller tensioning assembly includes a mounting frame, a plurality of first rollers arranged from top to bottom on the mounting frame, and two first fixing rings installed on each first roller; The first unpowered roller assembly includes a driven roller, a first guide roller and a second guide roller arranged side by side, a first belt, and a belt tensioning mechanism; The driven roller is located below and between the first guide roller and the second guide roller. The first belt is sequentially wound around the outer surfaces of the first guide roller, the driven roller, and the second guide roller. The first guide roller, the driven roller, the second guide roller, and the first belt together form a V-shaped conveyor channel for supporting and guiding materials. The belt tensioning mechanism includes a second belt connected to the end of the driven roller, a fixed end adjustment mechanism disposed at one end of the second belt, and a tensioning end adjustment mechanism disposed at the other end of the second belt. The fixed end adjustment mechanism is used to adjust the initial length of the second belt, and the tensioning end adjustment mechanism is used to adjust the tension of the second belt.

3. The packaging heat sealing equipment according to claim 2, characterized in that, The first unpowered roller mechanism further includes two opposing support frames, and the first guide roller and the second guide roller are rotatably mounted on the upper part of the support frames; the driven roller is rotatably mounted on the lower part of the support frame and is located below the middle of the first guide roller and the second guide roller; the support frame is an L-shaped support frame, and a waist-shaped hole is also opened on the bottom surface of the L-shaped support frame, and a portal frame is also installed on the L-shaped support frame.

4. The packaging heat sealing equipment according to claim 3, characterized in that, The fixed end adjustment mechanism includes a detachable L-shaped fixing plate mounted on a portal frame; the vertical part of the L-shaped fixing plate is provided with multiple height mounting holes, one end of the second belt is fastened to a height mounting hole, and the second belt is fixed to the L-shaped fixing plate by selecting different height mounting holes, thereby adjusting the initial length of the second belt. The tensioning end adjustment mechanism includes a tensioning fixing plate, an elastic element, a pin, and an adjusting screw; The other end of the second belt is fixed to the bottom of the tensioning plate. One end of the elastic element is connected to the upper part of the tensioning plate, and the other end is connected to the pin. One end of the pin passes through the portal frame, and the adjusting screw is set on the pin to adjust the length of the pin passing through the portal frame.

5. The packaging heat sealing equipment according to claim 1, characterized in that, The unwinding mechanism includes an unwinding motor, an air shaft connected to the output end of the unwinding motor, and a film roll disposed on the air shaft. The stamping assembly includes a stamping cylinder, a pressure block disposed at the output end of the stamping cylinder, and a punching die disposed below the pressure block.

6. The packaging heat sealing equipment according to claim 1, characterized in that, The heat sealing assembly includes a mounting plate, a heat sealing cylinder mounted on the mounting plate, first guide components located at the four corners of the mounting plate, a connecting plate located at the bottom of the guide components, a heat cutting component and a heat sealing mechanism fixed on the connecting plate, connecting rods connected to the four ends of the connecting plate, springs sleeved on the connecting rods, and a pressure frame connected to the bottom of the connecting rods; the output end of the heat sealing cylinder is connected to the connecting plate. The hot cutting assembly includes a hot cutting cylinder and a hot cutting blade; the output end of the hot cutting cylinder passes through a connecting plate and is connected to the hot cutting blade; the heat sealing mechanism includes a second guide assembly passing through the connecting plate, a heating block installed at the bottom of the second guide assembly, a thermocouple and a heating rod passing through the heating block, and a heat sealing joint placed at the bottom of the heating block.

7. The packaging heat sealing equipment according to claim 1, characterized in that, The indexing plate feeding assembly includes a cam divider, an indexing plate located at the output end of the cam divider, and multiple tooling slots located on the indexing plate; product connectors are placed in the tooling slots.

8. The packaging heat sealing equipment according to claim 1, characterized in that, The cold pressing assembly includes an upper plate, a lower plate placed below the upper plate, a connecting rod with one end on the upper plate and the other end on the lower plate, and a second spring sleeved on the connecting rod. The feeding assembly includes a feeding cylinder and a suction nozzle located at the output end of the feeding cylinder.

9. The packaging heat sealing equipment according to claim 1, characterized in that, The pull-open module includes an X-axis linear module, a first pressing mechanism disposed at the output end of the X-axis linear module, and a second pressing mechanism disposed downstream of the first pressing mechanism; The first clamping mechanism includes a first clamping seat, a first clamping cylinder mounted on the first clamping seat, and a first pressure plate disposed at the output end of the first clamping cylinder; the first clamping seat is disposed on the output end of the X-axis linear module; the first pressure plate is disposed opposite to the base plate of the first clamping seat; The second pressing mechanism includes a second pressing seat, a second pressing cylinder mounted on the second pressing seat, and a second pressure plate disposed at the output end of the second pressing cylinder; the second pressure plate is disposed opposite to the bottom plate of the second pressing seat.

10. The packaging heat sealing equipment according to claim 1, characterized in that, The winding mechanism includes a servo motor, a lead screw located at the output end of the servo motor, sliding components located on both sides of the lead screw, a sliding plate located on the sliding components and connected to the lead screw, a winding motor located on the sliding plate, and a winding air shaft located at the output end of the winding motor; the second unpowered roller mechanism includes two opposing vertical plates, a plurality of second rollers located on the vertical plates from top to bottom, and two second fixing rings installed on each second roller.

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