An automatic press sealing device and method of use thereof

Abstract

The application provides an automatic pressing and sealing device and a use method thereof, which are used for pressing and sealing a plastic bag and comprise a working platform, an upper fixing part, a lower fixing part, a plastic bag straightening mechanism, a pressing cylinder, a heating flat plate and an upper mounting plate. The plastic bag is placed on the working platform. The lower fixing part, the plastic bag straightening mechanism and the heating flat plate are arranged on the working platform. The upper fixing part and the pressing cylinder are arranged on the upper mounting plate. The lower fixing part is used for connecting the lower surface of the plastic bag. The upper fixing part is used for connecting the upper surface of the plastic bag. The plastic bag straightening mechanism enters the opening of the plastic bag and straightens the plastic bag. The pressing cylinder moves in the up-down direction. The opening of the plastic bag is difficult to open. The opening of the plastic bag is automatically opened through the upper fixing part and the lower fixing part, so that the plastic bag straightening mechanism can enter the opening of the plastic bag and straighten the plastic bag. In the whole working process of extruding and hot pressing the plastic bag, the opening of the plastic bag is in a tensioned and straightened working state, so that the hot pressing and sealing of the plastic bag is flat and wrinkle-free.

Description

Technical Field

[0001] This invention relates to the field of packaging equipment technology, and in particular to an automatic hot-pressing and sealing device and its usage method. Background Technology

[0002] Plastic bags are used for product packaging. When heat-sealing the opening of a plastic bag, due to the thickness of the product inside, there is a natural width difference between the top and bottom edges of the bag. Even after the top and bottom edges are pressed together, this width difference persists, causing wrinkles. After heat-sealing and cooling, the top and bottom edges fuse together at the seal, but the wrinkles generated during the heat-sealing process remain, affecting the bag's appearance. Furthermore, the greater the product thickness or the longer the bag opening, the more severe these wrinkles will be.

[0003] To address the common problem of wrinkles during heat sealing of plastic bags, new automated devices need to be developed to solve this issue. Summary of the Invention

[0004] In view of this, the present invention aims to provide an automatic heat sealing device and its usage method to solve the problem of wrinkles easily appearing at the heat sealing point of plastic bags.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] An automatic heat-sealing device is disclosed for heat-sealing plastic bags. The device includes a working platform, an upper fixing part, a lower fixing part, a bag-strapping mechanism, a pressing cylinder, a heating plate, and an upper mounting plate. The plastic bag is placed on the working platform. The lower fixing part, the bag-strapping mechanism, and the heating plate are mounted on the working platform. The upper fixing part and the pressing cylinder are mounted on the upper mounting plate. The lower fixing part connects to the lower surface of the plastic bag, and the upper fixing part connects to the upper surface of the plastic bag. The bag-strapping mechanism enters the opening of the plastic bag and straightens and aligns it. The pressing cylinder moves vertically. Plastic bags are relatively soft and, due to the lack of clamping points, the opening can be difficult to open. This application addresses this issue by providing an upper and lower fixing part, which allows the plastic bag opening to open automatically, facilitating the bag-strapping mechanism to enter the opening and straighten and align the bag. Because the opening of the plastic bag is kept taut and smoothed throughout the entire heat sealing process, the heat-sealed opening is guaranteed to be flat and wrinkle-free. This avoids wrinkles caused by width differences between the top and bottom edges of the bag.

[0007] Furthermore, the lower fixing part is a negative pressure air groove, which has a slot on the upper surface of the working platform. The lower end of the negative pressure air groove is connected to the suction port of the air groove exhaust fan. Through the negative pressure exhaust of the air groove exhaust fan, a negative pressure airflow and adsorption force are generated at the slot of the negative pressure air groove, which facilitates the adsorption of the lower adhesive film surface of the plastic bag by the negative pressure air groove.

[0008] Furthermore, the upper fixing part includes a displacement cylinder and a negative pressure adhesive bag workpiece. The displacement cylinder is connected to the upper surface of the upper mounting plate, and the displacement cylinder is equipped with a movable rod. The negative pressure adhesive bag workpiece is connected to the end of the movable rod and is located on the lower side of the upper mounting plate. When the negative pressure adhesive bag workpiece moves downward to above the adhesive bag, it generates a vacuum negative pressure airflow after being energized and ventilated, forming a negative pressure that adsorbs the upper adhesive film surface of the adhesive bag.

[0009] Furthermore, the bag-strapping mechanism includes a double-acting cylinder, two double-acting cylinder moving ends, and two bag-strapping moving parts. A double-acting cylinder moving end is provided on each of the left and right sides of the double-acting cylinder, and a bag-strapping moving part is provided for each double-acting cylinder moving end. The bag-strapping moving part includes a support rod telescopic cylinder, a telescopic cylinder mounting bracket, and a support rod. The double-acting cylinder is connected to the working platform.

[0010] Furthermore, the telescopic cylinder of the support rod drives the support rod to move in the front-to-back direction, and the moving end of the double-acting cylinder moves in the left-to-right direction. After the opening of the plastic bag is opened, the telescopic cylinder of the support rod moves in the front-to-back direction, causing the support rod to extend into the opening. Under the action of the moving end of the double-acting cylinder, the support rods on the left and right sides move in opposite directions. The left support rod stretches the left side of the opening to the left, and the right support rod stretches the right side of the opening to the right, thereby straightening the opening.

[0011] Furthermore, the telescopic cylinder mounting bracket includes a first flange and a second flange, which are L-shaped. The first flange has a mounting hole, the height of which is higher than the uppermost end of the double-acting cylinder. The moving end of the double-acting cylinder is connected to the second flange. The support rod telescopic cylinder is connected to the mounting hole, and the tail end of the support rod is connected to the telescopic rod of the support rod telescopic cylinder. The L-shaped telescopic cylinder mounting bracket not only ensures installation stability but also prevents the movement of the support rod from being affected by the double-acting cylinder.

[0012] Furthermore, the end of the movable rod of the pressing cylinder is connected to the pressing bag workpiece. The pressing cylinder is located at the upper end of the upper mounting plate, and the pressing bag workpiece is located at the lower end of the upper mounting plate. After the opening of the bag is opened and straightened, the pressing cylinder moves downward, and the pressing bag workpiece also moves downward, contacting the upper adhesive film surface of the bag. It then pushes the upper adhesive film surface to continue moving downward until the upper and lower adhesive film surfaces contact each other, pressing the upper and lower adhesive film surfaces onto the surface of the heating plate for pressing and heat treatment.

[0013] Furthermore, the pressing cylinder includes a pressing cylinder guide post and a pressing cylinder guide sleeve. The pressing cylinder guide post is vertically arranged and passes through the upper mounting plate. The pressing cylinder guide sleeve is fitted onto the upper end of the pressing cylinder guide post, and the pressing cylinder guide sleeve is located above the upper mounting plate. The lower end of the pressing cylinder guide post is connected to the pressing plastic bag workpiece. The vertically arranged pressing cylinder guide post guides the movement direction of the pressing plastic bag workpiece, preventing the position of the pressing plastic bag workpiece from shifting and affecting the pressing and heat sealing effect.

[0014] The present invention also proposes a method for using an automatic heat sealing device, which includes the following steps:

[0015] S1. Set operating parameters;

[0016] S2. Place the plastic bags containing the products;

[0017] S3. Separate the opening of the plastic bag;

[0018] S4. Smooth out the opening of the plastic bag;

[0019] S5. Press and heat seal the opening;

[0020] S6. Remove the packaged product from the plastic bag, the automatic heat sealing device returns to the starting position, and enters the next cycle process.

[0021] Furthermore, in step S3, the air tank exhaust fan starts working, and the negative pressure air tank generates negative pressure airflow, which uses the generated negative pressure adsorption force to adsorb the lower layer of the adhesive film surface of the plastic bag.

[0022] The displacement cylinder starts and moves downward, causing the negative pressure suction bag workpiece to move downward, and the lower surface of the negative pressure suction bag workpiece gradually approaches the upper surface of the bag.

[0023] At the same time, when the negative pressure adhesive bag is powered on and ventilated, a vacuum negative pressure airflow is generated, which acts on the upper surface of the adhesive bag and creates a vacuum adsorption on the upper adhesive film surface.

[0024] When the negative pressure adhesive bag workpiece moves downward to the designated position, the electrical control box sends a signal command. Upon receiving the command, the displacement cylinder starts to retract and move upward, driving the negative pressure adhesive bag workpiece upward. The negative pressure adhesive bag workpiece, adsorbing the upper adhesive film surface, moves upward.

[0025] Compared with existing technologies, the automatic heat sealing device and its usage method described in this invention have the following advantages:

[0026] (1) By setting the upper and lower fixing parts, the opening of the plastic bag is opened, which makes it easier for the plastic bag straightening mechanism to enter the plastic bag opening and straighten and align the plastic bag.

[0027] (2) The support rod of the bag straightening mechanism extends into the opening and straightens the opening. During the entire process of squeezing and heating the bag, the opening of the bag is also in a state of being stretched and flattened, which helps to ensure the appearance quality of the bag is flat and wrinkle-free.

[0028] (3) By using the automatic hot sealing device and its usage method of this application, the entire process of smoothing and aligning the upper and lower edges of the plastic bag opening, pressing and hot sealing can be automated, eliminating the negative impact of human on the product packaging quality, reducing labor intensity and improving production efficiency. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of the plastic bag described in this invention placed on the working platform;

[0031] Figure 2 This is a schematic diagram of the structure of placing the plastic bag in the designated position according to the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the lower adhesive film surface of the adsorption bag in the lower fixing part of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the upper adhesive film surface of the adsorption bag of the upper fixing part according to the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the plastic bag described in this invention, showing that the upper and lower layers of the adhesive film are separated.

[0035] Figure 6 This is a schematic diagram of the structure of the support rod of the present invention moving to the left and right sides to straighten the bag;

[0036] Figure 7 This is a schematic diagram of the structure for heat sealing of plastic bags according to the present invention;

[0037] Figure 8 This is a schematic diagram of the structure for completing the heat sealing of the plastic bag according to the present invention;

[0038] Figure 9 This is an exploded view of the automatic heat sealing device described in this invention;

[0039] Figure 10 To complete the sealing of the plastic bag;

[0040] Figure 11 for Figure 9 A magnified view of a portion at point A;

[0041] Figure 12 This is a schematic diagram of the working platform described in this invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Working platform; 101. Negative pressure air tank; 102. Mounting slot; 103. Start switch; 2. Plastic bag; 201. Product; 202. Plastic bag heat sealing area; 3. Heating flat plate; 301. Power supply end of heating element; 4. Mounting bracket; 5. Double-acting cylinder; 501. Moving end of double-acting cylinder; 502. Position sensor; 6. Upper mounting plate; 7. Lowering cylinder; 701. Lowering cylinder guide post; 702. Lowering cylinder guide sleeve; 703. Pressing plastic bag workpiece; 8. Displacement cylinder; 801. Negative pressure suction of plastic bag workpiece; 802. Air tank exhaust fan; 9. Support rod telescopic cylinder; 901. Telescopic cylinder mounting bracket; 902. Support rod; 10. Electrical control box. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The embodiments described herein are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not 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 the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] like Figures 1-12 An automatic heat-sealing device is disclosed for heat-sealing a plastic bag 2. The device includes a working platform 1, an upper fixing part, a lower fixing part, a bag-strapping mechanism, a pressing cylinder 7, a heating plate 3, and an upper mounting plate 6. The plastic bag 2 is placed on the working platform 1. The lower fixing part, the bag-strapping mechanism, and the heating plate 3 are mounted on the working platform 1. The upper fixing part and the pressing cylinder 7 are mounted on the upper mounting plate 6. The lower fixing part connects to the lower surface of the plastic bag 2, and the upper fixing part connects to the upper surface of the plastic bag 2. The upper and lower fixing parts separate the upper and lower surfaces of the plastic bag 2, opening the bag 2. The bag-strapping mechanism enters the opening of the plastic bag 2 and smooths and aligns it. The pressing cylinder 7 moves vertically to push the upper film surface of the plastic bag 2 downwards, and the heating plate 3 presses and heats the upper and lower film surfaces of the plastic bag 2.

[0047] Since the plastic bag 2 is relatively soft and lacks clamping and fixing points, its opening may be difficult to open. This application addresses this by incorporating upper and lower fixing parts, allowing the opening of the plastic bag 2 to open automatically, facilitating the smoothing mechanism to enter and align the bag 2. Because the opening of the plastic bag 2 is in a taut and smoothed state throughout the entire compression and heat sealing process, the heat-sealed opening of the plastic bag 2 is guaranteed to be flat and wrinkle-free. This avoids wrinkles caused by width differences between the upper and lower edges of the plastic bag 2.

[0048] Furthermore, the lower fixed part is a negative pressure air groove 101. The negative pressure air groove 101 has a slot on the upper surface of the working platform 1, and its lower end is connected to the suction port of the air groove exhaust fan 802. The negative pressure air groove 101 is sealed except for the slotted area, which is open. Through the negative pressure exhaust of the air groove exhaust fan 802, a negative pressure airflow and adsorption force are generated at the slot of the negative pressure air groove 101, facilitating the adsorption of the lower adhesive film surface of the plastic bag 2. Since the airflow of the air groove exhaust fan 802 is adjustable, the generated negative pressure airflow and adsorption force are also adjustable and can be set according to different plastic bags 2. The width of the slot should not be too wide to avoid insufficient negative pressure airflow and adsorption force per unit area; typically, the width is 2-6 mm. The length of the slot needs to be designed according to the length dimensions of the company's commonly used packaging plastic bags 2. Here, the width refers to the front-to-back direction, and the length refers to the left-to-right direction.

[0049] Furthermore, the upper fixing part includes a displacement cylinder 8 and a negative pressure suction bag workpiece 801. The displacement cylinder 8 is connected to the upper surface of the upper mounting plate 6. The displacement cylinder 8 is equipped with a movable rod, and the negative pressure suction bag workpiece 801 is connected to the end of the movable rod and located on the lower side of the upper mounting plate 6. When the displacement cylinder 8 operates, it causes the movable rod to extend and retract in the vertical direction, thereby driving the negative pressure suction bag workpiece 801 to move in the vertical direction. The negative pressure suction bag workpiece 801 moves downward to above the plastic bag 2. At the same time, after the negative pressure suction bag workpiece 801 is energized and ventilated, it generates a vacuum negative pressure airflow, forming a negative pressure that adsorbs the upper adhesive film surface of the plastic bag 2. The magnitude of the negative pressure suction generated by the negative pressure suction bag workpiece 801 is adjustable and can be set according to different plastic bags 2. When the displacement cylinder 8 extends downwards to its maximum position, the gap between the lower end face of the negative pressure adhesive bag workpiece 801 and the upper surface of the working platform 1 is 0.2–5 mm, which facilitates the displacement space for the upper adhesive film surface of the adhesive bag 2. After the displacement cylinder 8 retracts upwards, the distance between the negative pressure adhesive bag workpiece 801 and the upper surface of the working platform 1 should not be too large or too small, typically within the range of 20–60 mm. Furthermore, the displacement cylinders 8 and the negative pressure adhesive bag workpiece 801 are correspondingly matched and multiple sets are provided to improve the adsorption stability of the adhesive bag 2. The multiple displacement cylinders 8 are of the same specification.

[0050] This application utilizes the negative pressure air groove 101 and the negative pressure suction bag workpiece 801 to generate adsorption force, which adsorbs the lower and upper adhesive film surfaces of the adhesive bag 2 respectively. This not only allows the opening of the adhesive bag 2 to be opened, but also reduces wear and damage to the adhesive bag 2 by using adsorption, thus better protecting the adhesive bag 2.

[0051] The bag-straightening mechanism of this application includes a double-acting cylinder 5, two double-acting cylinder moving ends 501, and two bag-straightening moving parts. A double-acting cylinder moving end 501 is respectively arranged on the left and right sides of the double-acting cylinder 5. Each double-acting cylinder moving end 501 corresponds to a bag-straightening moving part. The bag-straightening moving part includes a support rod telescopic cylinder 9, a telescopic cylinder mounting bracket 901, and a support rod 902. The double-acting cylinder 5 is connected to the working platform 1. Furthermore, the double-acting cylinder 5 includes a position sensor 502. Each double-acting cylinder moving end 501 corresponds to a position sensor 502. When the double-acting cylinder moving end 501 moves to the position of the position sensor 502, it stops operating.

[0052] The telescopic cylinder 9 drives the support rod 902 to move in the front-to-back direction. The moving end 501 of the double-acting cylinder makes a directional displacement movement in the left-to-right direction, and the displacement stroke is adjustable. The moving end 501 of the double-acting cylinder on the left moves the left-side bag-strapping moving part to the left, and the moving end 501 of the double-acting cylinder on the right moves the right-side bag-strapping moving part to the right. After the opening of the bag 2 is opened, the telescopic cylinder 9 moves in the front-to-back direction, causing the support rod 902 to extend into the opening. Under the action of the moving end 501 of the double-acting cylinder, the left and right support rods 902 move in opposite directions. The left support rod 902 stretches the left side of the opening to the left, and the right support rod 902 stretches the right side of the opening to the right, thereby straightening the opening. The position sensor 502 is set at the position where the opening is straightened. Specifically, the depth to which the front end of the support rod 902 extends into the opening area of ​​the bag 2 is determined according to the process design requirements. Furthermore, the insertion depth of the front end of the support rod 902 is 5-20mm, which facilitates straightening the opening using the support rod 902 and allows the support rod 902 to quickly leave the opening. The front end of the support rod 902 is at least 2mm away from the side edge of the heating flat plate 3.

[0053] Furthermore, the telescopic cylinder mounting bracket 901 includes a first flange and a second flange, which are L-shaped. The first flange has a mounting hole, the height of which is higher than the uppermost end of the double-acting cylinder 5. The moving end 501 of the double-acting cylinder is connected to the second flange, thereby positioning the bag-strapping moving part on the moving end 501 of the double-acting cylinder. The support rod telescopic cylinder 9 is connected to the mounting hole, and the tail of the support rod 902 is connected to the telescopic rod of the support rod telescopic cylinder 9. The support rod 902 moves back and forth with the support rod telescopic cylinder 9. The L-shaped telescopic cylinder mounting bracket 901 not only ensures installation stability but also avoids the movement of the support rod 902 being affected by the double-acting cylinder 5. Furthermore, the support rod 902 is a rigid round bar with a smooth surface. The support rod 902 has a certain rigidity, which facilitates straightening the opening when the two support rods 902 move in opposite directions. The round bar shape of the support rod 902 facilitates better fitting with the opening and reduces wrinkles. The diameter of the contact area between the front end of the support rod 902 and the plastic bag should not be too large, preferably 2-4 mm.

[0054] The movable rod end of the pressing cylinder 7 is connected to the pressing bag workpiece 703. The pressing cylinder 7 is located at the upper end of the upper mounting plate 6, and the pressing bag workpiece 703 is located at the lower end of the upper mounting plate 6. When the pressing cylinder 7 operates, its movable rod extends and retracts in the vertical direction, thereby moving the pressing bag workpiece 703. After the opening of the bag 2 is opened and straightened, the pressing cylinder 7 moves downward, and the pressing bag workpiece 703 also moves downward, contacting the upper adhesive film surface of the bag 2. It pushes the upper adhesive film surface to continue moving downward until the upper and lower adhesive film surfaces contact each other, pressing them against the surface of the heating plate 3 for pressing and heat treatment. The pressing bag workpiece 703 presses against the upper end of the opening of the bag 2, making the opening wider and improving flatness. The pressing bag workpiece 703 can be made into a specified shape according to requirements. To better fit and seal the plastic bag 2, the pressing workpiece 703 is a long metal part, and the width of the bottom working surface is slightly smaller than the width of the heating flat plate 3. The bottom working surface can be set to a smooth surface.

[0055] Furthermore, the pressing cylinder 7 includes a pressing cylinder guide post 701 and a pressing cylinder guide sleeve 702. The pressing cylinder guide post 701 is vertically arranged and passes through the upper mounting plate 6. The pressing cylinder guide sleeve 702 is sleeved on the upper end of the pressing cylinder guide post 701, and the pressing cylinder guide sleeve 702 is located above the upper mounting plate 6. The lower end of the pressing cylinder guide post 701 is connected to the pressing bag workpiece 703. The pressing bag workpiece 703 moves up and down under the action of the pressing cylinder 7, and the pressing cylinder guide post 701 moves synchronously. The vertically arranged pressing cylinder guide post 701 guides the movement direction of the pressing bag workpiece 703, preventing the position of the pressing bag workpiece 703 from shifting and affecting the pressing and heat sealing effect. Furthermore, the pressing cylinder guide post 701 is arranged on the left and right sides of the pressing bag workpiece 703 to improve the guiding effect.

[0056] The bottom working surface of the compressed plastic bag workpiece 703 is the working surface that is squeezed and heated with the plastic bag 2. It is required that the plastic bag 2 should not stick to the bottom working surface after it is melted. Usually, an inert material layer is electroplated on the bottom working surface and the surrounding area, or an inert material is bonded on.

[0057] When the negative pressure absorbent bag workpiece 801 moves, it should not interfere with the position of the pressing bag workpiece 703.

[0058] The working platform 1 is provided with a mounting groove 102, and the heating plate 3 is located within the mounting groove 102. The heating plate 3 generates heat to achieve heat sealing of the plastic bag 2. Furthermore, the upper surface of the heating plate 3 is 0.2–0.5 mm lower than the upper surface of the working platform 1. This not only positions the heating plate 3 but also prevents it from protruding, ensuring the flatness of the lower surface of the plastic bag 2. The heating plate 3 includes a heating element power supply terminal 301, which provides power to achieve heating. The heating plate 3 is electrically connected to the electrical control box 10, which ensures that the temperature of the heating plate 3 remains within the set temperature range.

[0059] The upper surface of the heating plate 3 is required to have good thermal conductivity and should not stick to the plastic bag 2 after being squeezed. It should automatically separate from the plastic bag 2 after the heat sealing is completed.

[0060] The working platform 1 and the upper mounting plate 6 are connected by a mounting bracket 4, together forming the support frame of the automatic heat sealing device of this application. The working platform 1 and the upper mounting plate 6 also provide installation and good support for other components. The working platform 1 includes a start switch 103, which controls the start and stop of the device. Furthermore, the start switch 103 is located on the front end of the working platform 1, and its position conforms to ergonomic operating standards and equipment safety standards.

[0061] The electrical control box 10 includes various components such as a power supply, indicator lights, temperature display components, temperature control components, and relays. Its electrical control design is based on the working actions and process quality requirements of the automatic heat-sealing device of this application. By controlling the device's actions, it achieves the automatic heat-sealing production function to prevent wrinkles in the plastic bags 2. The electrical control box 10 is installed according to design requirements. In this application, the electrical control box 10 is installed on the upper end of the upper mounting plate 6.

[0062] The automatic heat sealing device of this application can separate the opening of the plastic bag 2, facilitating the automatic smoothing and alignment of the top and bottom edges of the opening of the plastic bag 2 after product 201 is placed inside, automatic pressing, heat sealing, and sealing of the top and bottom edges of the plastic bag 2. The automatically heat-sealed plastic bag has a smooth, wrinkle-free seal, making the packaging of product 201 neat and aesthetically pleasing. Furthermore, the automatic heat sealing device of this application automates the entire process of smoothing and aligning the top and bottom edges of the opening of the plastic bag 2, pressing, and heat sealing, eliminating the negative impact of human intervention on the packaging quality of product 201, reducing labor intensity, and improving production efficiency. It has significant economic and social value and is worthy of widespread application.

[0063] Specifically, in this application, the product 201 is underwear, and the opening of the plastic bag 2 is provided with a heat-sealing area 202.

[0064] The method of using the automatic heat-sealing device of the present invention includes the following steps:

[0065] S1. Set operating parameters;

[0066] Specifically, the temperature and hot-pressing time used when manually testing and pressing the plastic bag workpiece 703 to heat-seal the plastic bag 2 on the surface of the heated flat plate 3 to obtain a qualified packaged product 201 are used as standard working parameters.

[0067] Turn on the power supply of the equipment, and the power supply terminal 301 of the heating element is energized to heat the heating plate 3. According to the material, thickness, sealing shape, appearance requirements, etc. of the plastic bag 2, set the temperature of the heating plate 3 and the working time of the pressing plastic bag workpiece 703 to squeeze the plastic bag 2.

[0068] S2. Place the plastic bag 2 containing product 201;

[0069] Specifically, such as Figure 2 As shown, product 201 is placed in plastic bag 2. According to the sealing process requirements, plastic bag 2 is placed in the designated position on the upper surface of the work platform 1. At this time, the sealing position of plastic bag 2 to be heat-sealed is on the upper surface of the heating plate 3.

[0070] It should be noted that the position of product 201 inside the plastic bag 2 should avoid the heating flat plate 3, and product 201 should not be in the working area of ​​the negative pressure suction bag workpiece 801 and support rod 902.

[0071] S3. Separate the two openings of the plastic bag;

[0072] Specifically, pressing the start switch 103 activates the air duct exhaust fan 802, generating negative pressure airflow in the negative pressure air duct 101. This negative pressure then attracts the lower layer of adhesive film from the plastic bag 2. Figure 3 As shown.

[0073] The displacement cylinder 8 is activated and moves downward, causing the negative pressure suction bag workpiece 801 to move downward, and the lower surface of the negative pressure suction bag workpiece 801 gradually approaches the upper surface of the plastic bag 2.

[0074] Simultaneously, the negative pressure adhesive bag workpiece 801 is energized and ventilated, generating a vacuum negative pressure airflow that acts on the upper surface of the adhesive bag 2, creating a vacuum adsorption on the upper adhesive film surface, such as... Figure 4 As shown.

[0075] When the negative pressure suction bag workpiece 801 moves downward to the designated position, the electrical control box 10 sends a signal command. Upon receiving the command, the displacement cylinder 8 starts to retract and move upward, thus driving the negative pressure suction bag workpiece 801 upward. Figure 5 As shown, the negative pressure suction bag workpiece 801 adheres to the upper adhesive film surface and moves upward. Because the lower adhesive film surface is constantly adhered to by the negative pressure air groove 101 and remains fixed, the opening of the bag 2 separates. By utilizing the simultaneous adsorption of the upper and lower surfaces of the bag 2 by the negative pressure suction bag workpiece 801 and the negative pressure air groove 101, the upper and lower surfaces of the bag 2 are automatically separated at the opening position as the displacement cylinder 8 rises.

[0076] S4. Smooth out the two openings of the plastic bag;

[0077] Specifically, the electrical control box 10 outputs a signal command, and upon receiving the command, the support rod telescopic cylinder 9 starts working, pushing the support rod 902 forward and extending it into the opening area of ​​the plastic bag 2, as shown. Figure 6 As shown.

[0078] When the double-acting cylinder 5 starts working, the moving ends 501 of the two double-acting cylinders move to the left and right sides respectively, driving the support rod telescopic cylinder 9 and the support rod 902 to move to the left and right sides respectively.

[0079] The double-acting cylinder moving end 501 moves to the position sensor 502. The position sensor 502 senses the double-acting cylinder moving end 501 and sends a sensing signal to the electrical control box 10. The electrical control box 10 sends a corresponding command to the double-acting cylinder moving end 501 according to the built-in setting program, and the double-acting cylinder moving end 501 remains stationary.

[0080] At this time, the support rod 902 is positioned to tighten and flatten the upper and lower surfaces of the plastic bag 2, and the plastic bag 2 maintains this position and state, waiting for new instructions from the control box 10.

[0081] S5. Press and heat seal the opening;

[0082] Specifically, the electrical control box 10 outputs corresponding signal commands to the pressing cylinder 7. Upon receiving the signal command, the pressing cylinder 7 starts and moves downwards, causing the pressing bag workpiece 703 and the pressing cylinder guide post 701 to move downwards together. The pressing bag workpiece 703 contacts the upper adhesive film surface of the bag 2 and pushes the upper adhesive film surface downwards until the upper and lower adhesive film surfaces are together and pressed against the upper surface of the heating plate 3 for pressing and heat treatment. Figure 7 As shown, during the process of the pressing bag workpiece 703 pushing the upper adhesive film surface downward, the negative pressure suction bag workpiece 801 can no longer adsorb the upper adhesive film surface.

[0083] According to the set production process parameters, hot pressing is performed. After the hot pressing time is reached, the electrical control box 10 outputs a new signal command to the pressing cylinder 7. The pressing cylinder 7 starts to retract upward, driving the pressed plastic bag workpiece 703 and the pressing cylinder guide post 701 to move upward together. Figure 8 As shown. After the heat pressing is completed, the support rod 902 is removed from the opening of the plastic bag 2.

[0084] Once the pressure from the workpiece 703 is released, the plastic bag 2 automatically leaves the upper surface of the heating plate 3, ending the heating operation of the heating plate 3 on the plastic bag 2. The plastic bag 2 is then sealed and cooled.

[0085] Throughout the entire process of squeezing and heat-pressing the plastic bag 2, the support rods 902 at both ends of the opening of the plastic bag 2 are always in a state of tightening and smoothing the opening of the plastic bag 2, which helps to ensure the appearance quality of the plastic bag 2 being flat and wrinkle-free.

[0086] S6. Take out the plastic bag 2 containing the packaged product 201, the automatic heat sealing device returns to the starting position, and enters the next cycle process.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for using an automatic heat sealing device for heat sealing plastic bags (2), characterized in that, The automatic heat sealing device includes a working platform (1), an upper fixing part, a lower fixing part, a bag straightening mechanism, a pressing cylinder (7), a heating flat plate (3), and an upper mounting plate (6). The plastic bag (2) is placed on the working platform (1). The lower fixing part, the bag straightening mechanism, and the heating flat plate (3) are set on the working platform (1). The upper fixing part and the pressing cylinder (7) are set on the upper mounting plate (6). The lower fixing part is used to connect the lower surface of the plastic bag (2). The upper fixing part is used to connect the upper surface of the plastic bag (2). The bag straightening mechanism is used to enter the opening of the plastic bag (2) and straighten and align the plastic bag (2). The pressing cylinder (7) moves in the up and down direction. The lower fixed part is a negative pressure air groove (101). The negative pressure air groove (101) has a groove on the upper surface of the working platform (1). The lower end of the negative pressure air groove (101) is connected to the air inlet of the air groove exhaust fan (802). The upper fixed part includes a displacement cylinder (8) and a negative pressure suction bag workpiece (801). The displacement cylinder (8) is connected to the upper surface of the upper mounting plate (6). The displacement cylinder (8) is provided with a movable rod. The negative pressure suction bag workpiece (801) is connected to the end of the movable rod and is located on the lower side of the upper mounting plate (6). The method of using the automatic heat sealing device includes the following steps: S1. Set operating parameters; S2. Place the plastic bag (2) containing the product (201); S3. The negative pressure suction bag workpiece (801) adsorbs the upper adhesive film surface, and the negative pressure air groove (101) adsorbs the lower adhesive film surface, thus separating the opening of the adhesive bag (2); S4. The bag straightening mechanism straightens the opening of the bag (2); S5. Press and heat seal the opening; S6. Take out the plastic bag (2) containing the packaged product (201), the automatic hot sealing device returns to the starting position, and enters the next cycle process.

2. The method of using the automatic heat-sealing device according to claim 1, characterized in that, The bag-strapping mechanism includes a double-acting cylinder (5), two double-acting cylinder moving ends (501), and two bag-strapping moving parts. A double-acting cylinder moving end (501) is provided on the left and right sides of the double-acting cylinder (5), and each double-acting cylinder moving end (501) is provided with a bag-strapping moving part. The bag-strapping moving part includes a support rod telescopic cylinder (9), a telescopic cylinder mounting bracket (901), and a support rod (902). The double-acting cylinder (5) is connected to the working platform (1).

3. The method of using the automatic heat-sealing device according to claim 2, characterized in that, The telescopic cylinder (9) of the support rod drives the support rod (902) to move in the front-to-back direction, and the moving end (501) of the double-acting cylinder moves in the left-to-right direction.

4. The method of using the automatic heat-sealing device according to claim 2, characterized in that, The telescopic cylinder mounting bracket (901) includes a first flange and a second flange, which are L-shaped. The first flange is provided with a mounting hole, the height of which is higher than the uppermost end of the double-acting cylinder (5). The moving end (501) of the double-acting cylinder is connected to the second flange. The support rod telescopic cylinder (9) is connected to the mounting hole. The tail of the support rod (902) is connected to the telescopic rod of the support rod telescopic cylinder (9).

5. The method of using the automatic heat-sealing device according to claim 1, characterized in that, The end of the movable rod of the pressing cylinder (7) is connected to the pressing plastic bag workpiece (703). The pressing cylinder (7) is located at the upper end of the upper mounting plate (6), and the pressing plastic bag workpiece (703) is located at the lower end of the upper mounting plate (6).

6. The method of using the automatic heat-sealing device according to claim 5, characterized in that, The pressing cylinder (7) includes a pressing cylinder guide post (701) and a pressing cylinder guide sleeve (702). The pressing cylinder guide post (701) is vertically arranged and passes through the upper mounting plate (6). The pressing cylinder guide sleeve (702) is sleeved on the upper end of the pressing cylinder guide post (701). The pressing cylinder guide sleeve (702) is located above the upper mounting plate (6). The lower end of the pressing cylinder guide post (701) is connected to the pressing bag workpiece (703).

7. The method of using the automatic heat-sealing device according to claim 1, characterized in that, In step S3, the air tank exhaust fan (802) starts working, and the negative pressure air tank (101) generates negative pressure airflow, which uses the generated negative pressure adsorption force to adsorb the lower layer of the adhesive film surface of the plastic bag (2). The displacement cylinder (8) is started and moves downward, which drives the negative pressure suction bag workpiece (801) to move downward, and the lower surface of the negative pressure suction bag workpiece (801) gradually approaches the upper surface of the bag (2). At the same time, the negative pressure suction bag workpiece (801) is powered and ventilated to generate a vacuum negative pressure airflow, which acts on the upper surface of the bag (2) and generates vacuum adsorption on the upper adhesive film surface. When the negative pressure suction bag workpiece (801) moves downward to the designated position, the electrical control box (10) sends a signal command, and the displacement cylinder (8) receives the command and starts to retract and move upward, driving the negative pressure suction bag workpiece (801) to move upward. The negative pressure suction bag workpiece (801) adsorbs the upper adhesive film surface and moves upward.

Images