A film sealing structure of a plastic packaging machine

Abstract

The utility model relates to plastic packaging machine technical field, and disclose a plastic packaging machine film sealing structure, including tool holder and heating knife, tool holder is symmetrically arranged with two groups on the plastic packaging machine, and the symmetric two groups of tool holder between plastic film is provided, and the bottom of tool holder is provided with the mounting groove of fixed heating knife installation, and the both ends fixed link of heating knife have the control lever of control heating knife temperature, and the both ends of heating knife still fixedly installed have temperature sensor, the temperature data of heating knife that temperature sensor can real -time collection is fed back to control module in time in processing, and control module adjusts the heating state of heating knife through control lever accordingly, ensures that the heating knife of two groups always maintains in the best temperature interval of adaptation plastic film melting, fundamentally avoids the problem that plastic film melts insufficiently because of the temperature deviation of upper and lower heating knives, and greatly promotes the melting adhesion effect of sealing part.

Description

Technical Field

[0001] This utility model relates to the field of sealing machine technology, specifically to a sealing film structure for a sealing packaging machine. Background Technology

[0002] A plastic sealing machine is a device that uses heat and pressure to bond plastic film, such as PVC or PET film, to the surface of an item or to adhere two layers of film together. After the heating component reaches the set temperature, the pressing mechanism presses the film tightly to the item, softening and adhering the film, melting and bonding it to form a sealed edge. After a short cooling period, the film sets, preventing the packaged items from getting damp, leaking, or contaminated.

[0003] During the plastic film cutting and sealing process in a thermoforming machine, the sealing mechanism uses an upper and lower sealing blade arranged on opposite sides. Furthermore, the sealing blade temperature control system typically only has a single temperature detection and adjustment point. This makes it difficult for the thermoforming machine to independently detect and control the temperature based on differences in heat loss between the upper and lower sealing blades, installation gap deviations, and differences in heat dissipation in the working environment. This results in insufficient melting and bonding at the sealing point of the plastic film, leading to problems such as weak seals and sealing performance failure. In severe cases, it can even cause abnormal loads on the corresponding drive circuit of the sealing blade, generating electrical sparks and other circuit faults, requiring frequent machine shutdowns for maintenance and adjustments, severely impacting production efficiency. Utility Model Content

[0004] (I) Technical problem to be solved: In view of the shortcomings of the existing technology, this utility model provides a sealing structure for a plastic sealing packaging machine, which has the advantages of stable temperature of the upper and lower sealing blades and sufficient melting of the plastic film at the sealing position, thus solving the problem of weak sealing and failure of sealing performance of the existing upper and lower sealing blades at the plastic film sealing position.

[0005] (II) Technical Solution: To achieve the purpose of stabilizing the temperature of the upper and lower sealing blades and ensuring sufficient melting of the plastic film at the sealing position, this utility model provides the following technical solution: A sealing structure for a plastic sealing packaging machine, including a blade holder and a heating blade. Two sets of blade holders are symmetrically arranged on the plastic sealing machine, and a plastic film is placed between the two sets of blade holders. An installation groove is opened at the bottom of the blade holder, and the heating blade is fixedly embedded in the installation groove. A control rod for controlling the temperature of the heating blade is fixedly connected to both ends of the heating blade, and a temperature sensor is also fixedly installed at both ends of the heating blade. Adsorption tubes are fixedly connected to the edges on both sides of the bottom end of the installation groove. A cavity is provided in the adsorption tube and flowing gas is introduced into it. Two or more sets of adsorption holes are opened along its axial direction in the adsorption tube.

[0006] Preferably, both ends of the adsorption tube are gas supply ends, and the gas supply ends are connected to a gas circulation structure.

[0007] Preferably, the top of the blade holder is fixedly connected to two or more sets of fixing rods, the fixing rods are connected to the drive structure of the sealing machine, and the fixing rods drive the blade holder to move in the vertical direction.

[0008] Preferably, the depth of the mounting groove is less than the height of the heating blade.

[0009] Preferably, an inclined guide plate is fixedly installed inside the adsorption tube. The guide plate is located on one side of the adsorption hole, and the inclined direction of the guide plate faces the adsorption hole. When the airflow direction in the adsorption tube is the same as the inclined direction of the guide plate, a negative pressure is generated at the adsorption hole to adsorb the surrounding plastic film. When the airflow direction in the adsorption tube is opposite to the inclined direction of the guide plate, a positive pressure is generated at the adsorption hole to repel the surrounding plastic film.

[0010] Preferably, the adsorption tube is arranged along the length direction of the heating blade.

[0011] Preferably, the temperature sensor is connected to the control module inside the laminator; the control rod is connected to the control module inside the laminator via a wire.

[0012] (III) Beneficial Effects: Compared with the prior art, this utility model provides a sealing film structure for a plastic sealing packaging machine, which has the following beneficial effects: 1. This sealing structure for a plastic sealing packaging machine utilizes a combination of a temperature sensor structure and a heating blade structure. During processing, the temperature sensor collects real-time temperature data of the heating blade, which is promptly fed back to the control module. Based on this, the control module flexibly adjusts the heating state of the heating blade via a control lever, ensuring that the upper and lower heating blades are always maintained within the optimal temperature range for melting the plastic film. This fundamentally avoids the problem of insufficient melting of the plastic film caused by temperature deviations between the upper and lower heating blades, greatly improving the melting and bonding effect at the sealing point, making the seal more secure and reliable, and ensuring the sealing performance of the packaging. It effectively solves the problem in traditional technology where a single temperature control point cannot adapt to differences in heat loss between the upper and lower heating blades, installation gap deviations, and environmental heat dissipation differences.

[0013] 2. This sealing structure of a plastic sealing packaging machine, through the combined use of an adsorption tube structure and a guide plate structure, achieves stable positioning of the plastic film during the sealing process and rapid detachment and cooling after sealing. During the sealing process, airflow is introduced into the adsorption tube in the same direction as the guide plate, creating negative pressure around the adsorption holes. This firmly adsorbs the plastic film onto the blade holder and tightly adheres to the heating blade, preventing displacement of the plastic film during the heating and sealing process. This ensures full contact between the heating blade and the plastic film, improves heating uniformity and efficiency, and thus guarantees sealing quality. After sealing, by switching the airflow direction in the adsorption tube, positive pressure is created around the adsorption holes. This not only quickly blows the plastic film attached to the blade holder, preventing adhesion between the plastic film and the heating blade, but also reduces the surface temperature of the plastic film through airflow, accelerating the cooling and shaping process. This shortens the processing cycle of a single process, reduces waiting time between processes, and thus greatly improves overall processing efficiency and ensures the forming effect of the sealing area. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the sealing film structure of the plastic sealing packaging machine in this utility model; Figure 2 This is a front view of the sealing film structure of the plastic sealing packaging machine in this utility model; Figure 3 This is a schematic diagram of the adsorption tube structure of the sealing film structure in the plastic sealing packaging machine of this utility model; Figure 4 This is a schematic diagram of the guide plate structure of the sealing film structure of the plastic sealing packaging machine in this utility model.

[0015] In the diagram: 1. Knife holder; 11. Fixing rod; 2. Heating knife; 21. Control rod; 22. Temperature sensor; 3. Adsorption tube; 31. Adsorption hole; 32. Guide plate; 4. Plastic film. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-3A sealing structure for a plastic sealing machine includes a knife holder 1 and a heating knife 2. Two sets of knife holders 1 are symmetrically arranged vertically on the plastic sealing machine, with a plastic film 4 placed between the two sets of symmetrical knife holders 1. A mounting groove is opened at the bottom of the knife holder 1, and the heating knife 2 is fixedly embedded in the mounting groove. Control rods 21 for controlling the temperature of the heating knife 2 are fixedly connected to both ends of the heating knife 2. Mounting holes adapted to the control rods 21 are opened at both ends of the heating knife 2. The control rods 21 are embedded in the mounting holes by interference fit. The connection is filled with high-temperature resistant sealant to ensure the stability of the connection and prevent heat loss from the connection gap from affecting the temperature control accuracy. Temperature sensors 22 are also fixedly installed at both ends of the heating knife 2. The temperature sensors 22 are embedded, and their detection ends are directly and tightly attached to the heat-conducting area inside the heating knife 2. The sensor body is fixed in the reserved groove at the end of the heating knife 2 by a snap-fit ​​structure to ensure that the sensor can sense the real temperature of the heating knife 2 in real time. Adsorption tubes 3 are fixedly connected to the edges of both sides of the bottom end of the mounting groove. The adsorption tubes 3 have cavities inside and are filled with flowing gas. The adsorption tubes 3 have two or more sets of adsorption holes 31 along their axial direction. The adsorption tubes 3 are made of metal tubing that is compatible with the material of the knife holder 1. They are fixed to the edges of both sides of the bottom end of the mounting groove by welding. The weld joints are ground to ensure flatness and avoid interfering with the movement of the plastic film 4. The adsorption tubes 3 are arranged along the length of the heating knife 2. The cavities inside are processed by an integral molding process to ensure smooth and unobstructed airflow. The adsorption holes 31 are evenly distributed on the side of the adsorption tubes 3 facing the plastic film 4. The openings are rounded to prevent scratching the plastic film 4.

[0018] Please see Figures 1-3The adsorption tube 3 has two gas supply ends, which are connected to a gas circulation structure. The gas supply ends of the adsorption tube 3 are tubular extensions with sealed interfaces at the ends. They are detachably connected to the gas circulation structure's pipeline via sealed joints. Sealing rings are provided at the connections to ensure airtightness and prevent air leakage from affecting pressure stability. The gas circulation structure forms a closed loop with the gas supply ends through the pipeline, allowing for switching of airflow direction and speed according to different stages of the sealing process. Two or more sets of fixing rods 11 are fixedly connected to the top of the knife holder 1. These fixing rods 11 are connected to the drive structure of the sealing machine, driving the knife holder 1 to move vertically. The depth of the mounting groove is less than the height of the heating knife 2. After the heating knife 2 is embedded in the mounting groove, its side facing the plastic film 4 protrudes beyond the mounting groove, forming a structure protruding from the bottom of the knife holder 1. This ensures that the heating knife 2 can fully contact the plastic film 4, preventing the heating knife 2 from being completely enclosed due to an excessively deep mounting groove, thus hindering effective heat transfer to the plastic film 4. Temperature sensor 22 is connected to the control module inside the laminator; control lever 21 is connected to the control module inside the laminator via a wire. The signal output terminal of temperature sensor 22 is connected to the signal input terminal of the control module via a shielded wire. The wire is fitted with a high-temperature resistant sleeve and is arranged along the reserved wiring grooves of the blade holder 1 and the laminator frame to prevent the wire from being affected by high temperature or worn by moving parts. The control terminal of control lever 21 is fixedly connected to the wire via a terminal block, and the other end of the wire is connected to the execution output terminal of the control module. The connection point is insulated and sealed to prevent short circuits or signal interference.

[0019] Please see Figures 1-4 An inclined guide plate 32 is fixedly installed inside the adsorption tube 3. The guide plate 32 is located on one side of the adsorption hole 31, and its inclined direction faces the adsorption hole 31. The length of the guide plate 32 is adapted to the inner diameter of the adsorption tube 3, and its width is slightly smaller than the diameter of the adsorption tube 3, which ensures effective guidance of airflow without excessively obstructing airflow. When the airflow direction in the adsorption tube 3 is the same as the inclined direction of the guide plate 32, a negative pressure is generated at the adsorption hole 31 to adsorb the surrounding plastic film 4; when the airflow direction in the adsorption tube 3 is opposite to the inclined direction of the guide plate 32, a positive pressure is generated at the adsorption hole 31 to repel the surrounding plastic film 4. The adsorption tube 3 is set along the length of the heating blade 2. The adsorption tube 3 adopts a long strip structure adapted to the length of the heating blade 2, and is fixed on the blade holder 1 by a bracket. Its axis is parallel to the length direction of the heating blade 2, and the length of the adsorption tube 3 is slightly smaller than the length of the heating blade 2, ensuring that the adsorption force can be evenly applied to the entire sealing area. Furthermore, an appropriate distance is maintained between the adsorption tube 3 and the heating knife 2, which neither affects the normal operation of the heating knife 2 nor hinders the effective transmission of adsorption force.

[0020] Please see Figures 1-3During the sealing process of the plastic sealing packaging machine, the plastic film 4 continuously moves between two sets of symmetrically arranged blade holders 1. When the plastic film 4 reaches the preset sealing position, the fixing rod 11 connected to the top of the blade holder 1 is driven by the sealing machine's drive structure to pull the two sets of blade holders 1 closer to each other. At the same time, the plastic film 4 stops moving. At this time, the heating blades 2 embedded on the two sets of blade holders 1 act synchronously on the plastic film 4, heating the plastic film 4 to a molten state to complete the sealing operation. After the sealing is completed, the fixing rod 11 drives the upper and lower sets of blade holders 1 to move away from each other, and the sealed plastic film 4 resumes movement to enter the next process. Temperature sensors 22 are respectively installed at both ends of the upper and lower sets of heating blades 2. These temperature sensors 22 can collect the temperature data of the corresponding heating blades 2 in real time and feed it back to the sealing machine control module, thereby accurately controlling the temperature of the upper and lower heating blades 2, effectively avoiding the problem of insufficient melting of the plastic film 4 due to temperature deviation, and improving the sealing quality.

[0021] Please see Figures 1-4 During the sealing process of the plastic film 4, airflow is introduced into the adsorption tube 3 in the same direction as the inclined direction of the guide plate 32. When this airflow flows along the direction of the guide plate 32, the flow velocity in the area of ​​the guide plate 32 will increase, thereby reducing the pressure on both sides of the guide plate 32. This causes a negative pressure to be formed around the adsorption holes 31 on the adsorption tube 3. This negative pressure can adsorb the plastic film 4 onto the knife holder 1, allowing the plastic film 4 to fit tightly against the heating knife 2. This increases the contact area between the heating knife 2 and the plastic film 4 to improve heating efficiency, and also keeps the plastic film 4 in place during the heating process. The stability of the plastic film 4 prevents it from moving, thereby improving the sealing quality and efficiency. After the plastic film 4 is sealed, the airflow direction in the adsorption tube 3 switches to the opposite direction to the tilt direction of the guide plate 32. At this time, the airflow is obstructed by the opposite direction as it flows through the guide plate 32, causing the airflow to be discharged from the adsorption hole 31 along the guide plate 32. This increases the pressure around the adsorption hole 31, which not only blows off the plastic film 4 attached to the knife holder 1, but also reduces the surface temperature of the plastic film 4 at the same time, allowing the plastic film 4 to cool and solidify quickly, greatly improving the overall processing efficiency.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a plastic sealing machine, comprising a knife holder (1) and a heating knife (2), wherein two sets of knife holders (1) are symmetrically arranged vertically on the plastic sealing machine, and a plastic film (4) is provided between the two sets of symmetrically arranged knife holders (1), a mounting groove is provided at the bottom of the knife holder (1), the heating knife (2) is fixedly embedded in the mounting groove, and control rods (21) for controlling the temperature of the heating knife (2) are fixedly connected to both ends of the heating knife (2), characterized in that: Temperature sensors (22) are fixedly installed at both ends of the heating knife (2). Adsorption tubes (3) are also fixedly connected to the edges of both sides of the bottom end of the mounting groove. The adsorption tube (3) has a cavity and is filled with flowing gas. The adsorption tube (3) has two or more sets of adsorption holes (31) along its axial direction.

2. The sealing film structure of a plastic sealing packaging machine according to claim 1, characterized in that: The adsorption tube (3) has two gas supply ends at both ends, and the gas supply ends are connected to a gas circulation structure.

3. The sealing film structure of a plastic sealing packaging machine according to claim 1, characterized in that: The top of the blade holder (1) is fixedly connected to two or more sets of fixing rods (11), which are connected to the drive structure of the sealing machine. The fixing rods (11) drive the blade holder (1) to move in the vertical direction.

4. The sealing film structure of a plastic sealing packaging machine according to claim 1, characterized in that: The depth of the mounting groove is less than the height of the heating blade (2).

5. The sealing film structure of a plastic sealing packaging machine according to claim 1, characterized in that: An inclined guide plate (32) is fixedly installed inside the adsorption tube (3). The guide plate (32) is located on one side of the adsorption hole (31), and the inclined direction of the guide plate (32) is towards the adsorption hole (31). When the airflow direction in the adsorption tube (3) is the same as the inclined direction of the guide plate (32), a negative pressure is generated at the adsorption hole (31) to adsorb the surrounding plastic film (4). When the airflow direction in the adsorption tube (3) is opposite to the inclined direction of the guide plate (32), a positive pressure is generated at the adsorption hole (31) to repel the surrounding plastic film (4).

6. The sealing film structure of a plastic sealing packaging machine according to claim 1, characterized in that: The adsorption tube (3) is arranged along the length of the heating blade (2).

7. The sealing film structure of a plastic sealing packaging machine according to claim 1, characterized in that: The temperature sensor (22) is connected to the control module inside the sealing machine; the control lever (21) is connected to the control module inside the sealing machine via a wire.

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