Positioning structure for hot-press sealing of food packaging bag

Abstract

The utility model discloses a kind of positioning structure for food packaging bag hot-press sealing, belong to packaging bag sealing technical field, its technical scheme main points include fixed base, the both sides of the top of fixed base are equipped with positioning mechanism, the inside of fixed base is equipped with several auxiliary mechanisms, auxiliary mechanism passes through the multiple suction heads of fixed base inside, through the vacuum passage formed by vacuum pump, breather pipe and communication pipe, food packaging bag placed on fixed base can be uniformly adsorbed in large area, make packaging bag closely adhere to base surface, eliminate bag body wrinkle, avoid the positioning deviation caused by bag body bulging, PLC controller realizes the collaborative linkage of vacuum pump, servo motor and electric cylinder, when packaging bag is fixed by suction head, PLC controller can automatically start servo motor according to preset program, drive positioning mechanism to move to specified position, then trigger electric cylinder to drive lower pressing plate to complete pressing positioning, entire process does not need manual operation.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag sealing technology, and in particular to a positioning structure for heat sealing of food packaging bags. Background Technology

[0002] The basic principle of heat sealing technology is to use the high temperature generated by the heat sealer to soften the plastic film, and then use pressure to make the film tightly adhere to the container or packaging material to form a sealed package.

[0003] To address the aforementioned issues, existing patents have provided solutions. However, existing heat sealing devices lack a structure for positioning food packaging bags. This results in the bag openings being disoriented and misaligned when the bags enter the heat sealing station, making it impossible to precisely align them with the working area of ​​the heat sealing knife. Consequently, misalignment and incomplete sealing occur, reducing the sealing quality of the food packaging bags.

[0004] To address this, a positioning structure for heat sealing of food packaging bags is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning structure for heat sealing of food packaging bags, which can solve the problem that the existing packaging bag sealing lacks a structure for positioning the food packaging bag, resulting in the bag opening being disordered and misaligned when the food packaging bag enters the heat sealing station, making it impossible to accurately align with the working area of ​​the heat sealing knife, thus causing sealing deviation and leakage, and reducing the sealing quality of the food packaging bag.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a positioning structure for heat sealing of food packaging bags, comprising a fixed base, positioning mechanisms on both sides of the top of the fixed base, and several auxiliary mechanisms on the inner side of the fixed base. Each auxiliary mechanism includes several mounting holes, an adsorption head, a connecting pipe, a connecting ring plate, a vent pipe, a vacuum pump, and a PLC controller. The mounting holes are located on the inner side of the fixed base, the adsorption head is mounted inside the mounting holes, the connecting pipe is fixedly connected to the bottom of the adsorption head, the bottom of the connecting pipe extends through and to the bottom of the fixed base, the connecting ring plate is fixedly connected to the bottom of the connecting pipe, the vent pipe is fixedly connected to the bottom of the connecting ring plate, the vacuum pump is mounted on the left rear side of the inner side of the fixed base, the side of the vent pipe away from the connecting ring plate is fixedly connected to the front side of the vacuum pump, and the PLC controller is mounted on the left side of the fixed base.

[0007] Preferably, the positioning mechanism includes a moving groove, a limiting rod, a rotating shaft, a lead screw, two sliders, two threaded sleeves, a connecting rod, a support beam, an electric cylinder, a connecting plate, five spring telescopic rods, a lower pressure plate, and a servo motor. The moving groove is located on both sides of the top of the fixed base.

[0008] Preferably, the limiting rod is welded to the inner side of the left moving groove, the rotating shaft is installed on the inner side of the right moving groove, the lead screw is fixedly connected to both sides of the rotating shaft, the slider is slidably connected to the surface of the limiting rod, the threaded sleeve is threadedly connected to the surface of the lead screw, the connecting rods are respectively welded to the top of the slider and the top of the threaded sleeve, and the support beams are respectively welded between the left front connecting rod and the right front connecting rod and between the right front connecting rod and the right rear connecting rod.

[0009] Preferably, the electric cylinder is installed on the top of the support beam, the telescopic end of the bottom of the electric cylinder passes through and extends to the bottom of the support beam, the connecting plate is welded to the telescopic end of the bottom of the electric cylinder, the spring telescopic rod is fixedly connected to the bottom of the connecting plate, the lower pressure plate is welded to the telescopic end of the bottom of the spring telescopic rod, the servo motor is installed on the right rear side of the fixed base, the rear side of the rear lead screw is connected to the connecting shaft by a flat key, and the output end of the front side of the servo motor passes through the fixed base and is fixedly connected to the rear side of the connecting shaft.

[0010] Preferably, a reinforcing ring is welded to the side of the spring telescopic rod near the top of the lower pressure plate, and the surface of the reinforcing ring is coated with an anti-corrosion coating.

[0011] Preferably, a connecting block is welded to the chamfer of the surface of the fixed base, and a connecting screw hole is provided on the inner side of the connecting block.

[0012] Preferably, a sealing ring is welded to the side of the vent pipe near the connecting ring plate, and the surface of the sealing ring is coated with an anti-corrosion coating.

[0013] Preferably, a high-temperature resistant anti-slip pad is fixedly connected to the bottom of the lower pressure plate, and the bottom of the high-temperature resistant anti-slip pad is engraved with anti-slip patterns.

[0014] Preferably, the spring telescopic rod includes a fixed tube, a movable rod, and a compression spring. The fixed tube is fixedly connected to the bottom of the connecting plate, the movable rod is slidably connected to the inside of the fixed tube, and the compression spring is disposed inside the fixed tube. The bottom of the compression spring is fixedly connected to the top of the movable rod.

[0015] Preferably, the output terminal of the PLC controller is electrically connected to the input terminals of the vacuum pump, servo motor and electric cylinder respectively.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. The positioning mechanism of this application adopts a symmetrical guide drive with a limit rod and a slider and a lead screw and a threaded sleeve. The left side uses the limit rod to rigidly constrain the sliding trajectory of the slider, and the right side uses a servo motor to drive the lead screw to rotate, which drives the threaded sleeve to move smoothly along the moving groove. This can realize the position adjustment of the support beam and the lower pressure plate, and can adapt to food packaging bags of different widths and specifications, improving the switching efficiency of multi-specification packaging production. The lower pressure plate driven by the electric cylinder is connected to the connecting plate through five spring telescopic rods. The elastic buffering characteristics of the spring telescopic rods make the lower pressure plate form a flexible pressing effect when it contacts the packaging bag. This can ensure the stable positioning of the packaging bag with sufficient pressure, and avoid packaging bag damage or material compression deformation caused by rigid pressing. 2. The auxiliary mechanism of this application, through multiple suction heads inside the fixed base, and a vacuum passage formed by a vacuum pump, air pipe, and connecting pipe, can achieve large-area uniform adsorption of food packaging bags placed on the fixed base, making the packaging bags tightly adhere to the base surface, eliminating bag wrinkles, and avoiding positioning deviations caused by bag bulging. The PLC controller realizes the coordinated linkage of the vacuum pump, servo motor, and electric cylinder. After the packaging bag is fixed by the suction head, the PLC controller can automatically start the servo motor according to the preset program, drive the positioning mechanism to move to the designated position, and then trigger the electric cylinder to drive the lower pressure plate to complete the pressing and positioning. The whole process does not require manual operation, which not only avoids positioning errors that may be caused by manual intervention, but also reduces the risk of operators being burned by the heat sealing components. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the positioning structure for heat sealing of food packaging bags according to this utility model; Figure 2 This is a schematic diagram of the mounting hole structure of this utility model; Figure 3 This is a schematic diagram of the structure of the vent pipe of this utility model; Figure 4 This is a schematic diagram of the structure of the electric cylinder of this utility model; Figure 5 This is a schematic diagram of the structure of the lower pressure plate of this utility model; Figure 6 This is a schematic diagram of the structure of the high-temperature resistant anti-slip mat of this utility model.

[0018] In the diagram, 1. Fixed base; 2. Positioning mechanism; 201. Moving groove; 202. Limiting rod; 203. Rotating shaft; 204. Lead screw; 205. Slider; 206. Threaded sleeve; 207. Connecting rod; 208. Support beam; 209. Electric cylinder; 210. Connecting ring plate; 211. Spring telescopic rod; 212. Lower pressure plate; 213. Servo motor; 3. Auxiliary mechanism; 301. Mounting hole; 302. Adsorption head; 303. Connecting pipe; 304. Connecting plate; 305. Vent pipe; 306. Vacuum pump; 307. PLC controller; 4. Reinforcing ring; 5. Connecting block; 6. Connecting screw hole; 7. Sealing ring; 8. High-temperature resistant anti-slip pad. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-6 The present invention provides the following technical solution: A positioning structure for heat sealing of food packaging bags includes a fixed base 1. Positioning mechanisms 2 are provided on both sides of the top of the fixed base 1. Several auxiliary mechanisms 3 are provided on the inner side of the fixed base 1. The auxiliary mechanisms 3 include several mounting holes 301, suction heads 302, connecting pipes 303, connecting ring plates 210, vent pipes 305, vacuum pumps 306, and PLC controllers 307. The mounting holes 301 are located on the inner side of the fixed base 1. The suction heads 302 are installed on the inner side of the mounting holes 301. The connecting pipes 303 are fixedly connected to the bottom of the suction heads 302. The bottom of the connecting pipes 303 extends through and to the bottom of the fixed base 1. The connecting ring plates 210 are fixedly connected to the bottom of the connecting pipes 303. The vent pipes 305 are fixedly connected to the bottom of the connecting ring plates 210. The vacuum pump 306 is installed on the left rear side of the inner side of the fixed base 1. The side of the vent pipes 305 away from the connecting ring plates 210 is fixedly connected to the front side of the vacuum pump 306. The PLC controller 307 is installed on the left side of the fixed base 1.

[0021] In this embodiment: the fixed base 1 provides a stable installation reference for the positioning mechanism 2 and the auxiliary mechanism 3. The mounting hole 301 supports and limits the adsorption head 302. The adsorption head 302 is in direct contact with the packaging bag. The negative pressure generated by the vacuum pump 306 firmly fixes the packaging bag. The two ends of the connecting pipe 303 are fixedly connected to the adsorption head 302 and the connecting ring plate 210, respectively, ensuring the airtightness of the vacuum passage and preventing the adsorption force from decreasing due to air leakage. The connecting ring plate 210 realizes the convergence of the vacuum passages of multiple adsorption heads 302, so that the originally dispersed connecting pipes 303 can... The vacuum pump 306 is connected to the vacuum pipe 305 through a single vent pipe 305, which simplifies the pipeline layout and reduces the difficulty of installation and maintenance. The vent pipe 305 ensures that the negative pressure can be quickly transmitted to each adsorption head 302, improving the response speed of the adsorption action. The vacuum pump 306 provides a power source for the adsorption function of the auxiliary mechanism 3. By continuously pumping air, a stable negative pressure is formed at the top of the adsorption head 302, realizing non-contact fixation of the food packaging bag. The PLC controller 307 realizes the automated coordination of the actions of each mechanism through electrical connection with the vacuum pump 306, servo motor 213 and electric cylinder 209.

[0022] Specifically, such as Figure 4 , Figure 5 As shown, the positioning mechanism 2 includes a moving groove 201, a limiting rod 202, a rotating shaft 203, a lead screw 204, two sliders 205, two threaded sleeves 206, a connecting rod 207, a support beam 208, an electric cylinder 209, a connecting plate 304, five spring telescopic rods 211, a lower pressure plate 212, and a servo motor 213. The moving groove 201 is opened on both sides of the top of the fixed base 1.

[0023] Specifically, such as Figure 4 , Figure 5 As shown, the limiting rod 202 is welded to the inner side of the left moving groove 201, the rotating shaft 203 is installed on the inner side of the right moving groove 201, the lead screw 204 is fixedly connected to both sides of the rotating shaft 203, the slider 205 is slidably connected to the surface of the limiting rod 202, the threaded sleeve 206 is threadedly connected to the surface of the lead screw 204, the connecting rod 207 is welded to the top of the slider 205 and the top of the threaded sleeve 206 respectively, and the support beam 208 is welded between the left front connecting rod 207 and the right front connecting rod 207 and between the right front connecting rod 207 and the right rear connecting rod 207 respectively.

[0024] Specifically, such as Figure 4 , Figure 5As shown, the electric cylinder 209 is installed on the top of the support beam 208. The telescopic end of the bottom of the electric cylinder 209 passes through and extends to the bottom of the support beam 208. The connecting plate 304 is welded to the telescopic end of the bottom of the electric cylinder 209. The spring telescopic rod 211 is fixedly connected to the bottom of the connecting plate 304. The lower pressure plate 212 is welded to the telescopic end of the bottom of the spring telescopic rod 211. The servo motor 213 is installed on the right rear side of the fixed base 1. The rear side of the rear lead screw 204 is connected to the connecting shaft through a flat key. The output end of the front side of the servo motor 213 passes through the fixed base 1 and is fixedly connected to the rear side of the connecting shaft.

[0025] In this embodiment: the moving groove 201 provides a motion track for the slider 205 and the threaded sleeve 206, and the limiting rod 202 provides trajectory constraints for the movement of the slider 205, preventing the slider 205 from deviating left or right during movement. The rotating shaft 203 drives the lead screws 204 on both sides to rotate synchronously, ensuring the synchronous movement of the two threaded sleeves 206 on the right side. The lead screws 204, through their threaded engagement with the threaded sleeves 206, convert the rotational motion of the servo motor 213 into the linear motion of the threaded sleeves 206, realizing the position adjustment of the support beam 208. Furthermore, the two lead screws 204 cause the front support beam 208 and the rear support beam 208 to move synchronously towards or away from each other. The slider 205 can drive the left front connecting rod 207 and the left rear connecting rod 207 to move. The threaded sleeve 206 converts the rotational motion of the lead screw 204 into its own linear motion, driving the right connecting rod 207 and the support beam 208 to move. The connecting rod 207 serves as a connection between the slider 205, the threaded sleeve 206, and... The middle component of the support beam 208 serves a dual function of power transmission and structural connection. The support beam 208 provides a stable mounting base for the electric cylinder 209, which is the power source that drives the lower pressure plate 212 to complete the pressing action. It can control the descent height and pressing force of the lower pressure plate 212 to adapt to packaging bags of different thicknesses. The connecting plate 304 evenly distributes the single output force of the electric cylinder 209 to the five spring telescopic rods 211, ensuring that the pressing force of each part of the lower pressure plate 212 is uniform. The compression spring inside the spring telescopic rod 211 provides elastic buffer for the lower pressure plate 212. When the lower pressure plate 212 contacts the packaging bag, the contraction of the compression spring can absorb excess pressure and avoid damage to the packaging bag or deformation of the material caused by rigid pressing. The lower pressure plate 212 is the pressing component that directly contacts the packaging bag. Its flat bottom structure ensures full contact with the packaging bag and achieves uniform pressing. The servo motor 213 drives the lead screw 204 to rotate through the connecting shaft, realizing the displacement of the threaded sleeve 206.

[0026] Specifically, such as Figure 6 As shown, a reinforcing ring 4 is welded to the side of the spring telescopic rod 211 near the top of the lower pressure plate 212, and the surface of the reinforcing ring 4 is coated with an anti-corrosion coating.

[0027] Specifically, such as Figure 2 As shown, a connecting block 5 is welded to the chamfer of the surface of the fixed base 1, and a connecting screw hole 6 is provided on the inner side of the connecting block 5.

[0028] In this embodiment: by setting a reinforcing ring 4, the connection strength between the two is enhanced, avoiding the problem of weld breakage at the weld point during repeated extension and compression of the spring telescopic rod 211. By setting an anti-corrosion coating, it can resist the erosion of moisture and dust that may exist in the food packaging production environment, prevent rust, and extend the service life of the reinforcing ring 4. By setting a connecting block 5, the connecting screw hole 6 can be supported and limited. By setting a connecting screw hole 6, a rigid connection is achieved with the production line equipment through external bolts.

[0029] Specifically, such as Figure 3 As shown, a sealing ring 7 is welded to the side of the vent pipe 305 near the connecting ring plate 210, and the surface of the sealing ring 7 is coated with an anti-corrosion coating.

[0030] Specifically, such as Figure 6 As shown, a high-temperature resistant anti-slip pad 8 is fixedly connected to the bottom of the lower pressure plate 212, and the bottom of the high-temperature resistant anti-slip pad 8 is engraved with anti-slip patterns.

[0031] In this embodiment: by setting a sealing ring 7, the gap between the two is filled to prevent air leakage in the vacuum passage, ensuring that the negative pressure generated by the vacuum pump 306 can be fully transmitted to the adsorption head 302, thus ensuring the stability of the adsorption force. By setting an anti-corrosion coating, it can resist the erosion of condensate or corrosive gases that may exist in the vacuum passage, preventing the sealing ring 7 from rusting and failing. By setting a high-temperature resistant anti-slip pad 8, the lower pressure plate 212 can adapt to the high-temperature environment during hot sealing, preventing melting or damage due to high temperature. By setting an anti-slip texture, the friction with the surface of the packaging bag is increased, preventing the packaging bag from shifting after the lower pressure plate 212 is pressed.

[0032] Specifically, such as Figure 6 As shown, the spring telescopic rod 211 includes a fixed tube, a movable rod, and a compression spring. The fixed tube is fixedly connected to the bottom of the connecting plate 304, the movable rod is slidably connected to the inside of the fixed tube, and the compression spring is disposed inside the fixed tube. The bottom of the compression spring is fixedly connected to the top of the movable rod.

[0033] Specifically, such as Figure 4 As shown, the output terminal of the PLC controller 307 is electrically connected to the input terminals of the vacuum pump 306, the servo motor 213, and the electric cylinder 209, respectively.

[0034] In this embodiment: the spring telescopic rod 211 includes a fixed tube, a movable rod, and a compression spring. The fixed tube provides installation and guiding space for the movable rod and the compression spring. The movable rod achieves telescopic movement through sliding cooperation with the fixed tube, transmitting the elastic force of the compression spring to the lower pressure plate 212 to achieve flexible pressing. The compression spring can provide sufficient pressing force to fix the packaging bag and absorb impact through contraction to avoid rigid damage. By setting the output terminal of the PLC controller 307 to be electrically connected to the input terminals of the vacuum pump 306, servo motor 213, and electric cylinder 209 respectively, the PLC controller 307 can send control commands to the vacuum pump 306, servo motor 213, and electric cylinder 209 according to the preset program by centrally receiving and processing various signals in the positioning structure, thus avoiding the command delay and coordination error under the traditional distributed control method.

[0035] Working principle: First, the operator places the food packaging bag to be sealed on top of the fixed base 1, aligning the sealed end of the bag with the positioning mechanism 2. Then, the operator inputs the bag specifications and positioning parameters through the PLC controller 307's interface. After parameter preset, the PLC controller 307 starts the positioning program and enters signal processing and instruction output mode. Next, the PLC controller 307 sends a start command to the vacuum pump 306 of the auxiliary mechanism 3. The vacuum pump 306 quickly operates and draws air through the closed passage formed by the vent pipe 305, connecting ring plate 210, and connecting pipe 303, causing each suction... A stable negative pressure is formed at the top of the suction head 302, which is in close contact with the bottom of the packaging bag. This negative pressure firmly adheres the packaging bag to the surface of the fixed base 1, achieving initial fixation of the packaging bag. Then, the PLC controller 307 sends a drive signal to the servo motor 213. The output of the servo motor 213 drives the rotating shaft 203 in the right-side moving groove 201 to rotate synchronously via a connecting shaft. The lead screws 204 on both sides of the rotating shaft 203 rotate in the same direction and at the same speed. Since the lead screw 204 and the threaded sleeve 206 are threadedly engaged, the rotational motion of the lead screw 204 is converted into the linear motion of the threaded sleeve 206, driving the right-side connecting rod 207 along the moving groove 201. Simultaneously, the slider 205 in the left moving groove 201 slides synchronously along the limit rod 202 under the traction of the right structure, ensuring that the connecting rods 207 on both the left and right sides drive the front and rear support beams 208 to move smoothly until the lower pressure plate 212 is aligned directly above the sealing edge of the packaging bag. The servo motor 213 stops running under the command of the PLC controller 307, completing the positioning calibration. Afterwards, the PLC controller 307 sends a telescopic command to the electric cylinder 209. The telescopic end of the electric cylinder 209 drives the connecting plate 304 to move vertically downward. When the high-temperature resistant anti-slip pad 8 at the bottom of the lower pressure plate 212 contacts the surface of the packaging bag, the movable rod inside the spring telescopic rod 211 is fixed. As the tube contracts upwards, the compression spring is deformed, transforming the rigid thrust of the electric cylinder 209 into a flexible pressing force. This not only firmly secures the packaging bag through the anti-slip texture but also prevents packaging damage or material deformation caused by rigid compression. The electric cylinder 209 then maintains its extended state to ensure stable pressing. Finally, after the heat sealing is completed, the PLC controller 307 sends reset commands to the electric cylinder 209 and the vacuum pump 306 in sequence. The electric cylinder 209 contracts, causing the lower pressure plate 212 to rise, and the vacuum pump 306 stops operating, allowing the suction head 302 to release the packaging bag. The operator can then remove the sealed packaging bag, completing the entire positioning process and waiting for the next work cycle.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning structure for heat sealing of food packaging bags, comprising a fixed base (1), characterized in that: Positioning mechanisms (2) are provided on both sides of the top of the fixed base (1). Several auxiliary mechanisms (3) are provided on the inner side of the fixed base (1). The auxiliary mechanisms (3) include several mounting holes (301), a suction head (302), a connecting pipe (303), a connecting ring plate (304), a vent pipe (305), a vacuum pump (306), and a PLC controller (307). The mounting holes (301) are located on the inner side of the fixed base (1). The suction head (302) is installed on the inner side of the mounting hole (301). The connecting pipe (303) is fixedly connected to the fixed base (1). At the bottom of the adsorption head (302), the bottom of the connecting pipe (303) extends through and to the bottom of the fixed base (1). The connecting ring plate (304) is fixedly connected to the bottom of the connecting pipe (303). The vent pipe (305) is fixedly connected to the bottom of the connecting ring plate (304). The vacuum pump (306) is installed on the left rear side inside the fixed base (1). The side of the vent pipe (305) away from the connecting ring plate (304) is fixedly connected to the front side of the vacuum pump (306). The PLC controller (307) is installed on the left side of the fixed base (1).

2. The positioning structure for heat sealing of food packaging bags according to claim 1, characterized in that: The positioning mechanism (2) includes a moving groove (201), a limiting rod (202), a rotating shaft (203), a lead screw (204), two sliders (205), two threaded sleeves (206), a connecting rod (207), a support beam (208), an electric cylinder (209), a connecting plate (210), five spring telescopic rods (211), a lower pressure plate (212), and a servo motor (213). The moving groove (201) is located on both sides of the top of the fixed base (1).

3. The positioning structure for heat sealing of food packaging bags according to claim 2, characterized in that: The limiting rod (202) is welded to the inner side of the left moving groove (201), the rotating shaft (203) is installed on the inner side of the right moving groove (201), the lead screw (204) is fixedly connected to both sides of the rotating shaft (203), the slider (205) is slidably connected to the surface of the limiting rod (202), the threaded sleeve (206) is threadedly connected to the surface of the lead screw (204), the connecting rod (207) is welded to the top of the slider (205) and the top of the threaded sleeve (206) respectively, and the support beam (208) is welded between the left front connecting rod (207) and the right front connecting rod (207) and between the right front connecting rod (207) and the right rear connecting rod (207) respectively.

4. The positioning structure for heat sealing of food packaging bags according to claim 2, characterized in that: The electric cylinder (209) is installed on the top of the support beam (208). The telescopic end of the bottom of the electric cylinder (209) extends through and to the bottom of the support beam (208). The connecting plate (210) is welded to the telescopic end of the bottom of the electric cylinder (209). The spring telescopic rod (211) is fixedly connected to the bottom of the connecting plate (210). The lower pressure plate (212) is welded to the telescopic end of the bottom of the spring telescopic rod (211). The servo motor (213) is installed on the right rear side of the fixed base (1). The rear side of the rear lead screw (204) is connected to the connecting shaft by a flat key. The output end of the front side of the servo motor (213) extends through the fixed base (1) and is fixedly connected to the rear side of the connecting shaft.

5. The positioning structure for heat sealing of food packaging bags according to claim 2, characterized in that: A reinforcing ring (4) is welded to the side of the spring telescopic rod (211) near the top of the lower pressure plate (212), and the surface of the reinforcing ring (4) is coated with an anti-corrosion coating.

6. The positioning structure for heat sealing of food packaging bags according to claim 1, characterized in that: A connecting block (5) is welded to the chamfer of the surface of the fixed base (1), and a connecting screw hole (6) is provided on the inner side of the connecting block (5).

7. The positioning structure for heat sealing of food packaging bags according to claim 1, characterized in that: A sealing ring (7) is welded to the side of the vent pipe (305) near the connecting ring plate (304), and the surface of the sealing ring (7) is coated with an anti-corrosion coating.

8. The positioning structure for heat sealing of food packaging bags according to claim 2, characterized in that: The bottom of the lower pressure plate (212) is fixedly connected to a high temperature resistant anti-slip pad (8), and the bottom of the high temperature resistant anti-slip pad (8) is engraved with anti-slip patterns.

9. A positioning structure for heat sealing of a food packaging bag according to claim 2, characterized in that: The spring telescopic rod (211) includes a fixed tube, a movable rod, and a compression spring. The fixed tube is fixedly connected to the bottom of the connecting plate (210), the movable rod is slidably connected to the inside of the fixed tube, and the compression spring is set inside the fixed tube. The bottom of the compression spring is fixedly connected to the top of the movable rod.

10. A positioning structure for heat sealing of a food packaging bag according to claim 1, characterized in that: The output terminal of the PLC controller (307) is electrically connected to the input terminals of the vacuum pump (306), the servo motor (213), and the electric cylinder (209), respectively.

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