A plastic bag sealing and cutting device

Abstract

This utility model belongs to the field of plastic bag processing technology, and provides a plastic bag sealing and cutting device. The plastic bag sealing and cutting device includes a machine base, on which a winding wheel, a reversing wheel, a traction mechanism, and a sealing and cutting mechanism are sequentially arranged. The sealing and cutting mechanism includes a lifting platform slidably installed at the front end of the machine base. An upper cutting blade and a connecting bracket are respectively arranged at the front and rear of the lifting platform. An electric heating sealing plate is arranged below the connecting bracket, and the bottom surface of the electric heating sealing plate is lower than the bottom surface of the upper cutting blade. A lower cutting blade and a bottom plate are respectively arranged on the machine base corresponding to the upper cutting blade and the electric heating sealing plate. A pair of upper and lower horizontal plates are arranged at the front end of the lifting platform. Limit openings are opened on the inner side of the horizontal plates, and an eccentric wheel is located between the upper and lower limit openings. A lifting motor is installed inside the machine base. This utility model aims to solve the problems of poor coordination between sealing and cutting, unstable driving, and the inability of the guiding mechanism to self-adjust in existing plastic bag production.

Description

Technical Field

[0001] This utility model belongs to the field of plastic bag processing technology, and in particular relates to a plastic bag sealing and cutting device. Background Technology

[0002] In the automated production of plastic bags, sealing and cutting are key steps to ensure product quality. Currently, most continuous production equipment needs to achieve integrated operation of continuous conveying of plastic film, precise sealing, and fixed-length cutting. The core of this is to ensure uniform sealing strength, smooth cutting edges, and maintain high production efficiency.

[0003] In existing equipment, the coordination between the sealing and cutting mechanisms is often insufficient. In some cases, unstable drive force transmission leads to fluctuations in sealing pressure, resulting in insecure seals or overheating and breakage. Insufficient timing precision between the cutting and sealing actions can cause cutting position deviations, affecting product dimensional consistency. Furthermore, plastic film is prone to wrinkling during transport due to tension changes; if the traction mechanism cannot adaptively adjust the pressure, it will further exacerbate sealing and cutting errors. Utility Model Content

[0004] In view of the above problems, this utility model aims to solve the problems of poor coordination between sealing and cutting, unstable driving, and inability of the guiding mechanism to self-adjust in the existing plastic bag production, and provides a plastic bag sealing and cutting device with reasonable structure, precise action, and the ability to ensure product quality and production efficiency.

[0005] The present invention adopts the following technical solution:

[0006] The plastic bag sealing and cutting device includes a machine base, on which a roll unwinding wheel, a reversing wheel, a traction mechanism, and a sealing and cutting mechanism are sequentially arranged. The sealing and cutting mechanism includes a lifting platform slidably installed at the front end of the machine base. An upper cutting blade and a connecting bracket are respectively arranged at the front and rear of the lifting platform. An electric heating sealing plate is arranged below the connecting bracket, and the bottom surface of the electric heating sealing plate is lower than the bottom surface of the upper cutting blade. A lower cutting blade and a bottom plate are respectively arranged on the machine base corresponding to the upper cutting blade and the electric heating sealing plate. A pair of upper and lower horizontal plates are arranged at the front end of the lifting platform. A limit opening is opened on the inner side of the horizontal plate. An eccentric wheel is located between the upper and lower limit openings. A lifting motor is installed inside the machine base, and the drive shaft of the lifting motor is fixedly installed at the eccentric position of the eccentric wheel.

[0007] Furthermore, the traction mechanism includes a pair of upper and lower guide wheels, wherein the lower guide wheel is rotatably mounted inside the machine base, and the machine base is provided with a rotating assembly that drives the lower guide wheel to rotate. The machine base is provided with a pair of left and right fixed seats opposite the lower guide wheel, and the fixed seats have grooves. The shaft of the upper guide wheel is located in the groove on the same side, and a preload spring is embedded and installed in the groove above the shaft. An adjusting screw is screwed into the top of the fixed seat facing downwards, and the bottom of the adjusting screw always presses down on the preload spring.

[0008] Furthermore, the top surface of the machine tool has a cut-out opposite the upper and lower guide wheels.

[0009] Furthermore, the shaft of the lower guide wheel extends out of the machine base and is provided with a driven wheel. The rotating assembly includes a rotary motor installed in the machine base. The drive shaft of the rotary motor is provided with a driving wheel, and a belt is fitted between the driving wheel and the driven wheel.

[0010] Furthermore, the front end of the machine is provided with a guide frame facing the sealing and cutting mechanism, and the bottom surface of the guide frame is a downward sloping surface.

[0011] The beneficial effects of this utility model are:

[0012] 1. The sealing and cutting mechanism, through the cooperation of the eccentric wheel and the lifting motor, can realize the stable up and down movement of the lifting platform, so that the electric heating sealing plate and the upper cutting blade can be precisely matched with the bottom plate and the lower cutting blade respectively, completing the sealing first and then cutting, ensuring the quality and coordination of sealing and cutting.

[0013] 2. Under the action of the preload spring and the adjusting screw, the upper guide roller can adaptively adjust the pressure according to the thickness of the film, ensuring smooth film conveying and avoiding wrinkles that may affect subsequent processing.

[0014] 3. The components are rationally designed and operate stably, which can effectively improve the efficiency and quality of plastic bag production. Attached Figure Description

[0015] Figure 1 This utility model provides an overall drawing of a plastic bag sealing and cutting device.

[0016] Figure 2 This utility model provides a schematic diagram of the eccentric wheel installation.

[0017] Figure 3 This is a schematic diagram of the sealing and cutting mechanism provided by this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model patent clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0019] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0020] For ease of explanation, only the parts relevant to the embodiments of this utility model are shown.

[0021] Combination Figure 1-3 As shown, the plastic bag sealing and cutting device includes a machine base 1. The machine base is sequentially provided with a roll unwinding wheel 2, a reversing wheel 3, a traction mechanism, and a sealing and cutting mechanism. The sealing and cutting mechanism includes a lifting platform 4 slidably installed at the front end of the machine base 1. The lifting platform 4 is provided with an upper cutting blade 5 and a connecting bracket 6 at its front and rear, respectively. An electric heating sealing plate 7 is provided below the connecting bracket 6, and the bottom surface of the electric heating sealing plate 7 is lower than the bottom surface of the upper cutting blade 5. The machine base 1 is provided with a lower cutting blade 8 and a bottom plate 9 corresponding to the upper cutting blade 5 and the electric heating sealing plate 7, respectively. The front end of the lifting platform 4 is provided with a pair of upper and lower horizontal plates 10. The inner side of the horizontal plates 10 has a limit opening 11. An eccentric wheel 12 is provided in the upper and lower limit openings 11. The machine base 1 is provided with a lifting motor 13. The drive shaft of the lifting motor 13 is fixedly installed at the eccentric position of the eccentric wheel 12.

[0022] In this device, the unwinding reel holds a roll of plastic film. After being unwound from the unwinding reel, the plastic film changes direction via a reversing wheel and is conveyed to the traction mechanism. Under the traction of the traction mechanism, the plastic film is smoothly conveyed to the sealing and cutting mechanism. The sealing and cutting mechanism then seals and cuts the plastic film to form a plastic bag.

[0023] When the sealing and cutting mechanism is working, the lifting motor starts and drives the eccentric wheel to rotate. Since the eccentric wheel is located between the upper and lower limit ports, it drives the horizontal plate to move up and down, which in turn causes the lifting platform to slide up and down. When the lifting platform descends, the electric heating sealing plate first cooperates with the base plate to seal the plastic film. Then the upper and lower cutting blades cooperate to cut the plastic bag.

[0024] like Figure 1 The front end of the machine 1 is equipped with a guide frame 24 facing the sealing and cutting mechanism. The bottom surface of the guide frame 24 is a downward sloping surface. The sealed and cut plastic bags will fall into the guide frame and slide out along the sloping surface of the guide frame for easy collection.

[0025] As a preferred structure, such as Figure 3The traction mechanism includes a pair of upper and lower guide wheels, with the upper guide wheel marked as 141 and the lower guide wheel marked as 142. The lower guide wheel 142 is rotatably mounted inside the machine base 1. The machine base 1 has a rotating assembly that drives the lower guide wheel 142 to rotate. A pair of fixed seats 15 are located on the machine base 1, directly opposite the lower guide wheel 142. Each fixed seat has a groove 16, with the shaft of the upper guide wheel 141 located in the groove 16 on the same side. A preload spring 17 is embedded in the groove above the shaft. An adjusting screw 18 is screwed into the fixed seat 15 with its top facing downwards, and the bottom of the adjusting screw 18 always presses down on the preload spring 17. A break 19 is formed on the top surface of the machine base 1, directly opposite the upper and lower guide wheels. The upper guide wheel is located within the break, and the upper guide wheel 141 is rotatably connected to its shaft.

[0026] Before using this device to seal and cut the plastic bag, the plastic film needs to pass through the upper and lower guide rollers. Simply lift the upper guide roller, creating a gap between it and the lower guide roller, compressing the preload spring. Then, pass the front end of the plastic film through this gap. Release the upper guide roller, and the upper and lower guide rollers clamp the plastic film under the restoring force of the preload spring. Finally, the rotating assembly drives the lower guide roller to rotate, thus moving the plastic film smoothly forward.

[0027] In practice, the pressure of the preload spring on the upper guide wheel shaft can be changed by turning the adjusting screw, thereby adjusting the pressure between the upper and lower guide wheels to accommodate plastic films of different thicknesses. When the thickness of the plastic film changes, the preload spring will adaptively extend and retract, ensuring that the upper guide wheel always applies appropriate pressure to the plastic film, thus ensuring smooth conveying.

[0028] Since the preload spring is embedded in the groove, the groove serves to limit and guide the preload spring. The preload spring will not disengage from the groove when it deforms.

[0029] The rotating assembly includes a rotary motor 20 installed inside the machine base 1. A drive wheel 21 is fixedly mounted on the drive shaft of the rotary motor 20, and a belt 23 is fitted between the drive wheel 21 and the driven wheel 22. When the rotary motor starts, it drives the drive wheel to rotate, which in turn drives the driven wheel to rotate via the belt, thereby causing the lower guide wheel to rotate and thus realizing the conveying of the plastic film.

[0030] The above description is only a preferred embodiment of the present utility model and is 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 plastic bag sealing and cutting device, characterized in that: The plastic bag sealing and cutting device includes a machine base, on which a roll unwinding wheel, a reversing wheel, a traction mechanism, and a sealing and cutting mechanism are sequentially arranged. The sealing and cutting mechanism includes a lifting platform slidably installed at the front end of the machine base. An upper cutting blade and a connecting bracket are respectively arranged at the front and rear of the lifting platform. An electric heating sealing plate is arranged below the connecting bracket, and the bottom surface of the electric heating sealing plate is lower than the bottom surface of the upper cutting blade. A lower cutting blade and a bottom plate are respectively arranged on the machine base corresponding to the upper cutting blade and the electric heating sealing plate. A pair of upper and lower horizontal plates are arranged at the front end of the lifting platform. A limit opening is opened on the inner side of the horizontal plate. An eccentric wheel is located between the upper and lower limit openings. A lifting motor is installed inside the machine base, and the drive shaft of the lifting motor is fixedly installed at the eccentric position of the eccentric wheel.

2. The plastic bag sealing and cutting device as described in claim 1, characterized in that: The traction mechanism includes a pair of upper and lower guide wheels, wherein the lower guide wheel is rotatably installed inside the machine base. The machine base is provided with a rotating assembly that drives the lower guide wheel to rotate. The machine base is provided with a pair of left and right fixed seats opposite the lower guide wheel. The fixed seats have grooves, wherein the shaft of the upper guide wheel is located in the groove on the same side. A preload spring is embedded and installed in the groove above the shaft. An adjusting screw is screwed into the fixed seat with the top facing downwards. The bottom of the adjusting screw always presses down on the preload spring.

3. The plastic bag sealing and cutting device as described in claim 2, characterized in that: The top surface of the machine tool has a cut-out opposite the upper and lower guide wheels.

4. The plastic bag sealing and cutting device as described in claim 3, characterized in that: The shaft of the lower guide wheel extends out of the machine base and is provided with a driven wheel. The rotating assembly includes a rotary motor installed in the machine base. The drive shaft of the rotary motor is provided with a driving wheel, and a belt is fitted between the driving wheel and the driven wheel.

5. The plastic bag sealing and cutting device as described in claim 4, characterized in that: The front end of the machine is equipped with a guide frame facing the sealing and cutting mechanism, and the bottom surface of the guide frame is a downward sloping surface.

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