Vacuum sealing methods and equipment for packaging bags, and support rods

Abstract

This application discloses a vacuum sealing method and apparatus for packaging bags, as well as support rods. The vacuum sealing method includes a step of flattening the bag opening. This step includes: inserting two support rods into the middle region of the opening of a horizontally placed packaging bag; first, controlling the two support rods to move synchronously in opposite directions along the extension direction of the bag opening to flatten the lower surface of the bag opening; then, lowering the packaging bag to a set position, during the descent, controlling the two support rods to continue moving synchronously in opposite directions to flatten the upper surface of the bag opening. Through optimization of the sealing method and apparatus, the bag opening can be stably and reliably flattened before sealing, ensuring the flatness of the bag opening during sealing and improving the sealing quality.

Description

Technical Field

[0001] This application relates to the field of vacuum sealing packaging technology for aluminum foil bags, and in particular to a vacuum sealing method and equipment for packaging bags, and a support rod. Background Technology

[0002] Currently, vacuum sealing technology for packaging bags is mainly divided into two categories: internal extraction and external extraction. Internal extraction is not convenient to automate due to its principle. Although existing external extraction vacuum sealing equipment can automate the sealing of packaging bags, it cannot guarantee the flatness of the bag opening when sealing bags made of flexible materials such as aluminum foil, because these bags do not have a stable geometric shape. The sealing is prone to wrinkles, resulting in air leakage and poor appearance. Summary of the Invention

[0003] The purpose of this application is to provide a vacuum sealing method and equipment for packaging bags, as well as a support rod. By optimizing the sealing method and equipment, the bag opening can be stably and reliably flattened before sealing, ensuring the flatness of the bag opening during sealing and improving the sealing quality.

[0004] To address the aforementioned technical problems, this application provides a vacuum sealing method for a packaging bag, including a step of flattening the bag opening, the step of flattening the bag opening including:

[0005] Insert the two support rods into the middle area of ​​the opening of the horizontally placed packaging bag;

[0006] First, control the two support rods to move synchronously in opposite directions along the extension direction of the bag opening, so as to flatten the lower surface of the bag opening;

[0007] The packaging bag is then lowered to a set position. During the descent of the packaging bag, the two support rods are controlled to continue moving synchronously in opposite directions to flatten the upper surface of the bag opening.

[0008] This vacuum sealing method for packaging bags is suitable for sealing bags made of flexible materials. The method improves the step of flattening the bag opening during the sealing process, ensuring that the bag opening is flattened before sealing. Specifically, the method uses two struts moving synchronously to flatten the bag opening. First, the two struts are inserted into the middle area of ​​the bag opening. Then, the two struts are controlled to move in opposite directions along the extension direction of the bag opening. The struts first contact the lower surface of the bag. When they move to contact the side of the bag, the lower surface of the bag opening is flattened. With the struts in contact with the lower surface of the bag, the upper surface of the bag is bent upwards under tension. Then, the bag is controlled to descend, and during the descent, the two struts continue to move synchronously in opposite directions. The descent of the bag releases the stress between the struts and the bag. The two struts also flatten the upper surface of the bag opening. This improves the flattening effect of the bag opening, ensures the flatness of the bag opening, avoids wrinkles and other defects at the bag opening during sealing, and improves the sealing quality.

[0009] The vacuum sealing method for packaging bags described above includes a bag-clamping step after the flattening bag opening step, which includes:

[0010] The movable part of the control sealing assembly moves down to press the flattened bag opening onto the fixed part of the sealing assembly;

[0011] Control the two clamping members to move towards each other along the extension direction of the bag opening, and clamp the bag edges on both sides of the bag opening;

[0012] The movable part of the sealing assembly is controlled to move upward back to its original position, and then the two support rods are controlled to move synchronously towards each other to the air extraction position; wherein, the support rods have channels for air extraction;

[0013] The two clamping members are controlled to move in opposite directions along the extension direction of the bag opening to flatten the bag opening.

[0014] The vacuum sealing method for packaging bags described above includes a vacuuming step following the bag clamping step, which includes:

[0015] The movable part of the sealing assembly is controlled to move down again to press against the bag opening, so as to seal the gap between the support rod and the bag opening;

[0016] Control the two support rods to simultaneously evacuate air until the vacuum level inside the packaging bag reaches a set value;

[0017] Control the two support rods to detach from the bag opening.

[0018] The vacuum sealing method for packaging bags described above includes a bag feeding step before the bag opening flattening step, the bag feeding step comprising:

[0019] The packaging bag is placed on the carrying platform, and the carrying platform is driven to move horizontally to send the opening of the packaging bag into the position of the pallet, with the opening of the packaging bag located above the pallet;

[0020] The pallet is controlled to rise to raise the lower surface of the bag opening to a position below the support rod and above the sealing height, and then the pallet is controlled to fall to detach from the bag opening;

[0021] Control the carrying platform to continue moving horizontally to send the bag opening into the sealing position.

[0022] In the vacuum sealing method for the packaging bag described above, the carrying platform includes a support roller for supporting the packaging bag, the support roller being rotatable to give the packaging bag a degree of freedom to move along the direction extending from the bag opening.

[0023] This application also provides a vacuum sealing device for packaging bags, including a first frame, on which a flattening assembly is installed. The flattening assembly includes a first driving part, a second driving part, and two support rods. The two support rods are arranged along a first horizontal direction. The first driving part is used to drive the two support rods to move synchronously towards or away from each other along the first horizontal direction. The second driving part is used to drive the two support rods to move synchronously along a second horizontal direction. The second horizontal direction is perpendicular to the first horizontal direction.

[0024] The second frame is equipped with a third drive unit, a fourth drive unit, and a support platform. The support platform is used to support the packaging bag. The third drive unit is used to drive the support platform to move along the second horizontal direction. The fourth drive unit is used to drive the support platform to move up and down vertically.

[0025] This vacuum sealing equipment has improved the structure of the flattening component, while maintaining the same principle as the aforementioned vacuum sealing method. Using this vacuum sealing equipment can provide a flattening effect on the bag opening, ensuring the flatness of the bag opening and avoiding defects such as wrinkles at the bag opening during sealing, thereby improving the sealing quality.

[0026] The vacuum sealing equipment for packaging bags described above has a sealing assembly and a clamping assembly mounted on the first frame;

[0027] The sealing assembly includes a first movable part and a first fixed part. The first fixed part is located below the support rod, and the first movable part is located above the first fixed part and can move vertically to approach or move away from the first fixed part.

[0028] The clamping assembly includes two clamping members arranged along the first horizontal direction. The two clamping members are located on the outside of the two support rods, and the clamping members are movable along the first horizontal direction to clamp the side edge of the packaging bag.

[0029] The vacuum sealing equipment for packaging bags described above has a limiting structure on the first frame, which restricts the position of the clamping member when it moves toward the support rod.

[0030] The vacuum sealing equipment for packaging bags described above has a vacuum assembly mounted on the first frame. The vacuum assembly includes an air extraction device and the support rod, the support rod having a channel for communicating with the air extraction device.

[0031] The vacuum sealing equipment for packaging bags described above has a sealing assembly installed on the first frame. The sealing assembly includes a second movable part and a second fixed part. The second fixed part is located behind the first fixed part, and the support surface of the first fixed part and the support surface of the second fixed part are on the same horizontal plane. The second movable part can be vertically raised and lowered to move closer to or away from the second fixed part.

[0032] The first frame is equipped with a tray and a fifth drive unit. The tray is located in front of the first fixing part, and the fifth drive unit is used to drive the tray to lift and lower so as to raise the opening of the packaging bag.

[0033] The vacuum sealing device for packaging bags as described above includes a rotatable support roller for supporting the packaging bag, wherein the rotation center line of the support roller is parallel to the second horizontal direction.

[0034] In the vacuum sealing device for packaging bags described above, two positioning plates are installed on the second frame. The two positioning plates are located on both sides of the support platform in the first horizontal direction. The positioning plates can move closer to or further away from the support platform along the first horizontal direction to define the relative position of the packaging bag and the support platform.

[0035] This application also provides a support rod for a vacuum sealing device, the support rod being used to flatten the opening of a packaging bag and to evacuate air from the packaging bag; the support rod includes a front rod section for inserting into the packaging bag, the front rod section having a first dimension in a first horizontal direction and a second dimension in a vertical direction, the first dimension being larger than the second dimension.

[0036] When the aforementioned support rod is applied to vacuum sealing equipment and methods, it can both flatten the bag opening and vacuum the bag. Furthermore, the structure of the support rod helps to improve the flattening effect of the bag opening, thereby improving the sealing quality and simplifying the sealing process of the packaging bag.

[0037] As described above, in the support rod of the vacuum sealing device, the first dimension is at least three times the second dimension, and / or, the inner cavity of the front rod segment is provided with at least one support portion, the support portion extending along the length direction of the front rod segment, the support portion dividing the channel corresponding to the front rod segment into two or more parallel compartments.

[0038] The strut of the vacuum sealing device described above has a rhomboid cross-section in the front section.

[0039] The support rod of the vacuum sealing device described above further includes a rear rod section connected to the front rod section. The inner cavity of the rear rod section communicates with the inner cavity of the front rod section. The channel includes the inner cavity of the front rod section and the inner cavity of the rear rod section. The rear rod section has a cylindrical structure. Attached Figure Description

[0040] Figure 1 A schematic diagram of one embodiment of the vacuum sealing device for packaging bags provided in this application;

[0041] Figure 2 for Figure 1 A schematic diagram of the main structure of the equipment;

[0042] Figure 3 for Figure 1 A structural schematic diagram of the main body of the equipment from another perspective;

[0043] Figure 4 for Figure 1 Schematic diagram of the structure of the intermediate tooling platform;

[0044] Figure 5 and Figure 6 A schematic diagram of the process of flattening the bag opening of the packaging bag is shown in a specific embodiment;

[0045] Figure 7 for Figure 1 Perspective view of the central strut;

[0046] Figure 8 for Figure 7 A schematic diagram of the cross-section of the front section of the middle strut.

[0047] Explanation of reference numerals in the attached figures:

[0048] The equipment body 10, first frame 11, flattening assembly 12, first drive unit 121, second drive unit 122, support rod 123, front rod section 1231, support part 12311, rear rod section 1232, sealing assembly 13, first movable part 131, first fixed part 132, sealing power unit 133, clamping assembly 14, clamping member 141, clamping power unit 142, vacuum assembly 15, controller 151, switch valve 152, sealing assembly 16, second movable part 161, second fixed part 162, sealing power unit 163, pallet 17, fifth drive unit 171, first limiting member 181, second limiting member 182;

[0049] Tooling platform 20, second frame 21, bearing platform 22, support roller 221, third drive unit 23, fourth drive unit 24, positioning plate 25;

[0050] Packaging bag 30, bag opening 31, upper bag surface 311, lower bag surface 312. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] For ease of understanding and concise description, the following text will explain the vacuum sealing method and equipment for packaging bags together, and the beneficial effects will not be discussed again.

[0053] Without loss of generality, the vacuum sealing equipment is illustrated in the figure, and the vacuum sealing method can be implemented by this vacuum sealing equipment. It should be understood that the equipment for implementing the vacuum sealing method is not limited to the example shown in the figure.

[0054] The vacuum sealing method and equipment for packaging bags provided in this application are used for sealing packaging bags. Before sealing, the packaging bag has already contained the product to be packaged. The packaging bag mentioned below refers to a packaging bag already containing the product. This method and equipment are mainly used for packaging bags made of flexible materials, such as aluminum foil bags, and can ensure that the bag opening is flat before sealing to guarantee sealing quality.

[0055] For ease of description and explanation, this paper defines three directions based on a horizontally placed packaging bag. The first horizontal direction x is the direction in which the opening of the packaging bag extends. The second horizontal direction y is the direction perpendicular to the direction in which the opening of the packaging bag extends. The third direction, the vertical direction y, is the direction perpendicular to the horizontal plane, that is, the direction perpendicular to the plane formed by the first horizontal direction x and the second horizontal direction y.

[0056] Please refer to Figures 1 to 4 , Figure 1A schematic diagram of one embodiment of the vacuum sealing device for packaging bags provided in this application; Figure 2 for Figure 1 A schematic diagram of the main structure of the equipment;

[0057] Figure 3 for Figure 1 A structural schematic diagram of the main body of the equipment from another perspective; Figure 4 for Figure 1 A structural diagram of the intermediate tooling platform.

[0058] In this embodiment, the vacuum sealing equipment for packaging bags includes a main body 10 and a tooling platform 20. Typically, these two are separate units for ease of operation, inspection, and maintenance. The main body 10 includes a first frame 11, on which various components are mounted for sealing the opening 31 of the packaging bag 30. The tooling platform 20 primarily supports the packaging bag 30, feeding it into the main body 10 for sealing.

[0059] To facilitate sealing the opening 31 of the packaging bag 30, the packaging bag 30 is placed horizontally with its opening 31 facing the side of the equipment body 10. The extension direction of the opening 31 is parallel to the first horizontal direction x. As illustrated in the diagram, the packaging bag 30 is roughly rectangular, with its opening 31 extending along the width of the packaging bag 30. Thus, the first horizontal direction x represents the width of the packaging bag 30, and the second horizontal direction y represents the length of the packaging bag 30.

[0060] The vacuum sealing method of the packaging bag 30 includes the step of flattening the bag opening. Since the packaging bag 30 is a flexible material and does not have a stable geometric shape, it is necessary to flatten the bag opening 31 to keep it flat.

[0061] In this embodiment, the step of flattening the bag opening includes:

[0062] S11. Insert the two support rods 123 into the middle area of ​​the opening 31 of the horizontally placed packaging bag 30;

[0063] S12. First, control the two support rods 123 to move synchronously in opposite directions along the first horizontal direction x, so as to flatten the lower bag surface of the bag opening 31.

[0064] S13. Then lower the packaging bag 30 to the set position. During the descent of the packaging bag 30, control the two support rods 123 to continue to move synchronously in opposite directions to flatten the upper surface of the bag opening 31.

[0065] It should be noted that the bag opening 31 of the packaging bag 30 refers to the area of ​​a certain length near the open end of the packaging bag 30.

[0066] In this embodiment, the vacuum sealing device for the packaging bag 30 includes a flattening assembly 12, which is mounted on the first frame 11 of the main body 10 of the device. The flattening assembly 12 includes a first drive unit 121, a second drive unit 122, and two support rods 123. The two support rods 123 are arranged along a first horizontal direction x. The first drive unit 121 is used to drive the two support rods 123 to move synchronously towards or away from each other. That is, under the drive of the first drive unit 121, the two support rods 123 move in opposite directions and move simultaneously to reduce or increase the distance between them. The second drive unit 122 is used to drive the two support rods 123 to move synchronously along a second horizontal direction y.

[0067] Thus, in actual operation, during the step of flattening the bag opening, the operation of inserting the support rod 123 into the bag opening 31 of the packaging bag 30 can be achieved by driving the second drive unit 122, and the operation of the two support rods 123 moving synchronously in opposite directions along the first horizontal direction x can be achieved by driving the first drive unit 121.

[0068] For example, the first drive unit 121 can use a servo motor as a power source to precisely control the movement position of the two support rods 123 and ensure a leveling effect. A transmission structure is provided between the servo motor and the two support rods 123. The synchronous movement of the two support rods 123 towards or away from each other is achieved through the setting of the transmission structure. For example, the transmission structure can be in the form of a rotary belt.

[0069] For example, the second drive unit 122 may be a telescopic cylinder or a hydraulic telescopic cylinder, etc.

[0070] The second frame 21 of the tooling platform 20 is equipped with a carrying platform 22, a third drive unit 23 and a fourth drive unit 24. The packaging bag 30 is placed horizontally on the carrying platform 22 with its bag opening 31 facing the side where the first frame 11 is located. The third drive unit 23 is used to drive the carrying platform 22 to move along the second horizontal direction y, and the fourth drive unit 24 is used to drive the carrying platform 22 to rise and fall along the vertical direction z.

[0071] Thus, in actual operation, during the step of flattening the bag opening, the descent of the packaging bag 30 can be achieved by driving the fourth drive unit 24.

[0072] The third drive unit 23 and the fourth drive unit 24 can be driven by cylinders, motors, or other drive components with telescopic functions.

[0073] The aforementioned method of flattening the bag opening ensures that the bag opening 31 of the packaging bag 30 is in a flat state, avoiding wrinkles and other defects at the sealing area during sealing, and thus improving the sealing quality.

[0074] Please combine them together Figure 5 and Figure 6 To understand this, we can look at the different states of the bag opening 31 of the packaging bag 30 during the process of flattening the bag opening.

[0075] Figure 5 This is the view from the end where the opening 31 of the packaging bag 30 is located. Figure 6 This is a side view of the packaging bag 30. Figure 5 The perspective shown in the image is that the left and right directions are the first horizontal direction x. Figure 6 From the perspective shown, the left and right directions in the figure represent the second horizontal direction y.

[0076] like Figure 5 and Figure 6 As shown, state one is the state after the two support rods 123 are inserted into the middle area of ​​the bag opening 31. At this time, the bag opening 31 of the packaging bag 30 is open. The two support rods 123 are controlled to move synchronously in opposite directions along the first horizontal direction x, and the direction of movement is shown by the arrow in the figure. During the movement, the support rods 123 will first contact the lower bag surface 312 of the bag opening 31. When the support rods 123 move to contact the side bag surface of the bag opening 31, the two support rods 123 flatten the lower bag surface 312 of the bag opening 31, as shown in state two. At this time, the equilibrium state formed by the force applied to the bag opening 31 makes the lower bag surface 312 of the bag opening 31 flattened and in a taut posture. However, the upper bag surface 311 is not necessarily in a taut posture. It may be in an upwardly curved posture as shown in state two, or it may be in other postures, as shown in the figure. In state two, the two sides of the upper bag surface 311 are symmetrical with respect to the center line of the packaging bag 30. In the actual flattening process, the upper bag surface 311 may not be symmetrical. The figure only shows one possible geometric relationship. Next, the packaging bag 30 is controlled to descend, and during the descent, the two support rods 123 are controlled to continue to move synchronously in opposite directions. Since the height of the support rods 123 remains unchanged, when the packaging bag 30 descends, the lower bag surface 312 of the bag opening 31 will disengage from the support rods 123, as shown in state three. The previous force balance state will be broken. At this time, the two support rods 123 move synchronously in opposite directions, and apply a larger force to the bag opening 31 to restore the force balance state and completely flatten the bag opening 31, even if both the upper bag surface 311 and the lower bag surface 312 of the bag opening 31 are in a flattened state, as shown in state four.

[0077] It should be noted that after the two support rods 123 move back to back for the first time, they have already made contact with the side area of ​​the bag opening 31. When they move back to back for the second time, they only need to move a small distance to achieve flatness, as can be seen from the comparison between state three and state four.

[0078] In this embodiment, the two support rods 123 move synchronously, which ensures that both of them contact the side of the bag opening 31 at the same time, which helps to ensure the flattening effect and the stability of the flattening action.

[0079] Compared with the existing single-stage flattening action, the flattening step provided in this embodiment ensures the flattening effect of the bag opening 31 by using two flattening actions and the second flattening action combined with the descent of the packaging bag 30. This allows the bag opening 31 to remain flat after being flattened, avoiding wrinkles and other defects during subsequent sealing, and improving sealing quality. At the same time, the vacuum sealing equipment can automate the operation of flattening the bag opening.

[0080] Before the bag opening 31 of the packaging bag 30 is flattened, it needs to be fed into the corresponding position of the main body 10 of the equipment. In other words, before the bag opening flattening step, the vacuum sealing method also includes a bag feeding step.

[0081] In this embodiment, the first frame 11 of the main body 10 of the equipment has a sealing support surface. During the sealing operation, the flattened bag opening 31 is supported by this sealing support surface to ensure that the bag opening 31 is in a flat state during the sealing process. It should be understood that the height of the support rod 123 is higher than the sealing support surface, so as to facilitate the insertion of the bag opening 31 for the flattening operation.

[0082] The first frame 11 is also equipped with a pallet 17 and a fifth drive unit 171. The pallet 17 is located in front of the sealing support surface, and the fifth drive unit 171 is used to drive the pallet 17 to move up and down in the vertical direction z, so as to lift the bag opening 31 of the packaging bag 30. Here, "front" refers to the side of the equipment body 10 that is close to the tooling platform 20. That is to say, when the tooling platform 20 sends the packaging bag 30 into the equipment body 10, it first reaches the position of the pallet 17 and then reaches the position of the sealing support surface.

[0083] In this embodiment, the bag feeding step includes:

[0084] S21. Place the packaging bag 30 on the support platform 22 of the tooling platform 20, drive the support platform 22 to move along the second horizontal direction y, and send the bag opening 31 of the packaging bag 30 into the position of the pallet 17.

[0085] In specific operation, the fourth drive unit 24 of the tooling platform 20 can be used to drive the bearing platform 22 to rise and fall in the vertical direction z so that the packaging bag 30 is at a suitable height, so as to avoid interference between the packaging bag 30 and the pallet 17 when the packaging bag 30 moves towards the main body 10 of the equipment. It can be understood that this suitable height requires that the lower surface of the packaging bag 30 is not lower than the pallet 17.

[0086] S22. After the bag opening 31 of the packaging bag 30 is placed into the position of the pallet 17, the bag opening 31 is above the pallet 17. Control the pallet 17 to rise so that the lower surface of the bag opening 31 is raised to a position lower than the support rod 123 and higher than the sealing height. Then control the pallet 17 to fall back to its original position so that the pallet 17 is detached from the bag opening 31. At this time, the bag opening 31 is in a suspended state.

[0087] The sealing height here can be understood as the position of the aforementioned sealing support surface. Raising the lower surface of the bag opening 31 to this position ensures that the support rod 123 can be smoothly inserted into the bag opening 31 so as to flatten the bag opening.

[0088] In actual operation, the lifting and lowering of the pallet 17 is controlled by the fifth drive unit 171.

[0089] In specific applications, such as Figure 1 and Figure 2 As shown, the pallet 17 includes a horizontal plate portion and an inclined plate portion. The inclined plate portion is closer to the tooling platform 20 than the horizontal plate portion. The front end of the inclined plate portion is inclined downward. In this way, when the bag opening 31 of the packaging bag 30 moves towards the pallet 17, the influence of the pallet 17 on the bag opening 31 can be avoided, which is conducive to smoothly sending the bag opening 31 into the upper part of the pallet 17.

[0090] S23. After the pallet 17 lifts the bag opening 31 and then lowers back to its original position, the control platform 22 continues to move along the second horizontal direction y, sending the bag opening 31 into the sealing position. It should be understood that at this time, the bag opening 31 is above the sealing support surface.

[0091] In the operation of the above steps, the movement of the support platform 22 along the second horizontal direction y can be driven by the third drive unit 23.

[0092] As described above, the bag feeding step involves two steps to feed the bag opening 31 of the packaging bag 30 into the flattening position. First, the bag opening 31 is fed to the pallet 17, and the pallet 17 is used to straighten the bag opening 31. Then, the bag opening 31 is fed into the sealing position. In this way, the posture of the bag opening 31 is adjusted before the flattening step, which makes it easier for the support rod 123 to be inserted smoothly into the bag opening 31. The posture of the bag opening 31 does not affect the flattening action, which can ensure the flattening effect and further guarantee the sealing quality of the bag opening 31.

[0093] In practical applications, the support platform 22 is slidably connected to the second frame 21. A guide structure with a sliding groove and rail can also be provided between the support platform 22 and the second frame 21 to guide the movement of the support platform 22 in the second horizontal direction y. The support platform 22 can be slidably connected to the second frame 21 in the second horizontal direction y via a support frame, and the support platform 22 is then slidably connected to the support frame vertically. The figure is only an example; in actual applications, it can be adaptively configured according to the movement requirements of the support platform 22.

[0094] In this embodiment, the supporting platform 22 includes a rotatable support roller 221 for supporting the packaging bag 30. The rotation center line of the support roller 221 is parallel to the second horizontal direction y. Specifically, the supporting platform 22 may include a support frame, on which the support roller 221 is rotatably mounted. The support roller 221 and the support frame are connected by bearings to reduce wear between them and ensure smooth rotation of the support roller 221.

[0095] In this way, because the support roller 221 can rotate, the friction between the packaging bag 30 and the support roller 221 is small during the step of flattening the bag opening, which can reduce the wear on the packaging bag 30. At the same time, it increases the degree of freedom of the packaging bag 30 to move in the first horizontal direction x. During the step of flattening the bag opening, the packaging bag 30 can rely on the degree of freedom in the first horizontal direction x to eliminate the positional deviation between the bag opening 31 and the two support rods 123 in the first horizontal direction x, further improving the flattening effect of the bag opening 31.

[0096] In this embodiment, the vacuum sealing method includes a bag-clamping step after the bag opening flattening step. After flattening the bag opening 31 of the packaging bag 30, the bag opening 31 is clamped to keep it in a flat state, facilitating subsequent vacuuming and sealing operations. The bag-clamping step is followed by a vacuuming step and a sealing step.

[0097] Accordingly, the main body 10 of the vacuum sealing equipment is equipped with a sealing component 13, a clamping component 14, a vacuuming component 15, and a sealing component 16.

[0098] The sealing assembly 13 includes a first movable part 131 and a first fixed part 132. The first fixed part 132 is located on the rear side of the tray 17 and has a support surface. The support surface is on the same horizontal plane as the aforementioned sealing support surface. The first movable part 131 is located above the first fixed part 132 and can move in the vertical direction z to approach or move away from the first fixed part 132.

[0099] In a specific configuration, the vertical lifting of the first movable part 131 can be driven by the sealing power part 133, which can be a telescopic cylinder or an electric push rod, etc.

[0100] The clamping assembly 14 includes two clamping members 141 arranged along a first horizontal direction x. The two clamping members 141 are located on the outside of the two support rods 123, and the clamping members 141 are movable along the first horizontal direction x to clamp the side edge of the packaging bag 30. It should be understood that the clamping members 141 specifically clamp the side edge of the bag at the location of the bag opening 31.

[0101] The clamping assembly 14 also includes a clamping power unit 142, which drives the clamping member 141 to move along the first horizontal direction x. In specific configuration, the two clamping members 141 can move synchronously or independently. When the two clamping members 141 move independently, the clamping power unit 142 can be equipped with two power members to drive the two clamping members 141 to move respectively. When the two clamping members 141 move synchronously, the clamping power unit 142 can be equipped with one power member that is connected to the two clamping members 141 through a transmission structure.

[0102] The vacuum assembly 15 includes an air extraction device (not shown) and a support rod 123. The support rod 123 has a channel for communicating with the air extraction device. That is, the support rod 123 is a hollow structure, which serves as part of the support rod assembly 12 to flatten the bag opening 31 and as part of the vacuum assembly 15 to extract air from the packaging bag 30.

[0103] The sealing assembly 16 includes a second movable part 161 and a second fixed part 162. The second fixed part 162 is located behind the first fixed part 132 of the sealing assembly 13, that is, the second fixed part 162 is farther away from the tray 17 relative to the first fixed part 132. The second movable part 161 is located above the second fixed part 162 and can move up and down in the vertical direction z to approach or move away from the second fixed part 162. The second fixed part 162 has the aforementioned sealing support surface, as before, the support surface of the second fixed part 162 is on the same horizontal plane as the support surface of the first fixed part 132. In this way, the lower surface of the bag opening 31 can be on the same horizontal plane during sealing and closure, avoiding affecting the sealing effect.

[0104] In a specific configuration, the lifting and lowering of the second movable part 161 can be achieved by driving the sealing power part 163, which can be a drive component with telescopic movement function such as a cylinder.

[0105] In this embodiment, the step of clamping the bag opening may include:

[0106] S31, the first movable part 131 of the control sealing assembly 13 moves down to press the flattened bag opening 31 onto the first fixed part 132 of the sealing assembly 13;

[0107] S32. Control the two clamping parts 141 to move towards each other along the first horizontal direction x, and clamp the bag edges on both sides of the bag opening 31.

[0108] S33, control the first movable part 131 of the sealing assembly 13 to move back to its original position, and then control the two support rods 123 to move synchronously towards each other to the air extraction position;

[0109] S34. Control the two clamping parts 141 to move in opposite directions along the first horizontal direction x to flatten the bag opening 31.

[0110] In this way, after the opening 31 of the packaging bag 30 is flattened by the flattening component 12, the first movable part 131 of the sealing component 13 moves down to support the flattened opening 31 by the first fixed part 132, keeping the opening 31 in a flat state. Then, the two clamping parts 141 are controlled to clamp the bag edges on both sides of the opening 31, so that the flattened opening 31 remains flat after clamping, avoiding the clamping from having an adverse effect on the flattened opening 31. After that, the first movable part 131 moves up back to its original position. Since the opening 31 has been clamped by the clamping parts 141, the two support rods 123 move synchronously towards each other to the air extraction position to facilitate subsequent air extraction operations. Then, the two clamping parts are controlled to move away from each other along the first horizontal direction x to flatten the opening 31, ensuring that the opening 31 is flat and eliminating the influence that the opening 31 may have caused when the support rods 123 moved, ensuring that the opening 31 is in a flat state.

[0111] In practical applications, the air extraction position is generally in the middle area of ​​the bag opening 31. A relatively ideal air extraction position can be obtained through experiments and analysis. The movement position of the support rod 123 is precisely controlled by the first drive unit 121.

[0112] It should be noted that the support rod 123 used in this embodiment has a channel for air extraction. That is to say, the support rod 123 serves not only as part of the flattening component 12, but also as part of the air extraction component 15. In other words, the support rod 123 serves both to flatten the bag opening 31 and to extract the air from the packaging bag 30.

[0113] In specific applications, the first frame 11 is provided with a limiting structure, which is used to limit the position of the clamping member 141 when it moves towards the support rod 123. In this way, after the bag opening 31 is flattened, during the process of the clamping member 141 moving towards each other to clamp the side of the bag opening 31, the clamping member 141 can be prevented from moving excessively and colliding with the support rod 123.

[0114] Specifically, the limiting structure includes a first limiting member 181 and a second limiting member 182. The first limiting member 181 is connected to the clamping member 141. When the clamping member 141 moves, the first limiting member 181 moves accordingly. Specifically, the first limiting member 181 can be fixed on the mounting structure on which the clamping member 141 is installed. The second limiting member 182 can be installed on the outside of the support rod 123. When the clamping member 141 moves towards the support rod 123 until the first limiting member 181 and the second limiting member 182 abut against each other, the clamping member 141 cannot continue to move, thus limiting the movement position of the clamping member 141.

[0115] It should be understood that the cooperation between the first limiting member 181 and the second limiting member 182 should be such that the limit position of the movement of the clamping member 141 can clamp the side edge of the bag opening 31.

[0116] In practical applications, the packaging bags 30 vary in size, with different dimensions in the first horizontal direction x. To accommodate the sealing operation of packaging bags 30 of different sizes, the second limiting member 182 can be connected to the support rod 123. That is, when the support rod 123 moves, the second limiting member 182 also moves accordingly. Since the support rod 123 will move outward along the first horizontal direction x to the side edge of the packaging bag 30 during the operation of flattening the bag opening 31, regardless of the size of the packaging bag 30, after the step of flattening the bag opening, the support rod 123 and the second limiting member 182 are both near the side edge of the bag opening 31. At this time, when the clamping member 141 moves in the clamping direction, the first limiting member 181 and the second limiting member 182 abut against each other, ensuring that the position of the clamping member 141 can clamp the side edge of the bag opening 31.

[0117] In a specific configuration, the second limiting member 182 can be installed on the mounting base of the mounting strut 123. Of course, the second limiting member 182 is still positioned between the strut 123 and the clamping member 141 to provide a limiting function. The positional relationships here refer to the relevant components on the same side.

[0118] In this embodiment, the vacuuming step includes:

[0119] S41, the first movable part 131 of the control sealing assembly 13 moves down again to press against the bag opening 31, so as to seal the support rod 123 and the bag opening 31;

[0120] S42. Control the two support rods 123 to simultaneously draw air until the vacuum level inside the packaging bag 30 reaches the set value;

[0121] S43. Control the two support rods 123 to disengage from the bag opening 31. Specifically, the second drive unit 122 drives the two support rods 123 to move away from the packaging bag 30 along the second horizontal direction y, so as to disengage from the bag opening 31.

[0122] In this way, by using two support rods 123 with suction channels to perform suction simultaneously, the suction efficiency can be improved. During the suction process, the support rods 123 and the bag opening 31 are sealed by the sealing component 13 to ensure the suction effect.

[0123] After the air is extracted, the sealing component 16 can be used to seal the bag. The sealing component 16 can be heat-sealed. The second movable part 161 presses the bag opening 31 and the second fixed part 162 together. The bag opening 31 is sealed by heating and melting while ensuring no air leakage and cooling to form a shape.

[0124] In specific applications, the air extraction assembly 15 also includes a controller 151 and a switching valve 152. The switching valve 152 is disposed on the connecting pipeline between the air extraction device and the support rod 123, and the controller 151 can be used to control the state of the switching valve 152. The figure only illustrates the positions of the controller 151 and the switching valve 152 exemplarily; in actual installation, the positions can be determined according to the pipeline layout and application requirements. Except for the support rod 123, the specific structural composition of the air extraction assembly 15 can be implemented based on existing technologies and will not be detailed here.

[0125] The specific structural forms and sealing principles of each component of the sealing assembly 16 can be implemented based on existing technologies and are not the core points of this invention, so they will not be described in detail here.

[0126] In the vacuum sealing method, after the sealing operation, the relevant components on the first frame 11 can be controlled to return to their original positions. For example, the clamping part 141 can return to its original position to release the clamping on the side of the bag opening 31. The first movable part 131 of the sealing component 13 and the second movable part 161 of the sealing component 16 both move back to their original positions in the vertical direction z. After that, the third drive part 23 on the tooling platform 20 drives the bearing platform 22 to move away from the main body of the equipment 10 in the second horizontal direction y, so as to facilitate the unloading operation of the sealed packaging bag 30 and the loading operation of the next packaging bag 30 that needs to be sealed.

[0127] In this embodiment, the vacuum sealing equipment is also equipped with two positioning plates 25 on the second frame 21 of the tooling platform 20. The two positioning plates 25 are located on both sides of the bearing platform 22 in the first horizontal direction x. The positioning plates 25 can move closer to or further away from the bearing platform 22 in the first horizontal direction x to define the relative position of the packaging bag 30 and the bearing platform 22.

[0128] In actual operation, after sealing is completed and the sealed packaging bag 30 is detached from the main body 10 by the carrying platform 22, the two positioning plates 25 can be controlled to move closer to the carrying platform 22 to limit the packaging bag 30 and prevent the packaging bag 30 from shifting position on the support roller 221 of the carrying platform 22, thus affecting the gripping before automatic unloading. The two positioning plates 25 can be driven and controlled by one power component or by two power components.

[0129] In this embodiment, the support rod 123 of the vacuum sealing device has been structurally improved so that the support rod 123 is not only conducive to the operation of flattening the bag opening 31, but also convenient for the air extraction operation.

[0130] Please refer to this as well. Figure 7 and Figure 8 understand, Figure 7 for Figure 1 Perspective view of the central strut; Figure 8 for Figure 7A schematic diagram of the cross-section of the front section of the middle strut.

[0131] In this embodiment, the support rod 123 includes a front rod segment 1231 for inserting into the packaging bag 30. This front rod segment 1231 has a first dimension in the first horizontal direction x and a second dimension in the vertical direction z. Figure 8 The viewpoint shown Figure 8 The left-right direction of the paper surface is the first horizontal direction x, and the up-down direction of the paper surface is the vertical direction z, wherein the first dimension is set larger than the second dimension. In this way, the support rod 123 has a flat structure and a larger dimension in the extension direction of the bag opening 31, which helps to reduce the distance between the upper bag surface 311 and the lower bag surface 312 of the bag opening 31, and is more conducive to ensuring the flatness of the bag opening 31 during the step of flattening the bag opening.

[0132] For example, the first dimension of the front bar section 1231 is at least three times the second dimension. For instance, if the second dimension is 3 mm, then the first dimension is not less than 9 mm, so that the front bar section 1231 has a relatively flat structure that can better flatten the bag opening 31.

[0133] For example, the front rod section 1231 is provided with at least one support portion 12311 inside. The support portion 12311 extends along the length direction of the front rod section 1231 to divide the channel corresponding to the front rod section 1231 into two or more parallel chambers, so as to avoid affecting the ventilation of the inner cavity of the front rod section 1231. The provision of the support portion 12311 can improve the structural strength of the front rod section 123.

[0134] like Figure 7 and Figure 8 As shown, in a specific configuration, the cross-section of the front rod section 1231 can be rhomboid in shape, and a support portion 12311 is provided inside. The two sharp corners of the front rod section 1231 in the first horizontal direction x can be smoothly transitioned to avoid tearing the packaging bag 30 when the bag opening 31 is flattened.

[0135] Besides the scheme shown in the diagram, the cross-section of the front rod section 1231 can also be in other shapes, such as elliptical.

[0136] In this embodiment, the support rod 123 also includes a rear rod section 1232 connected to the front rod section 1231. The inner cavity of the rear rod section 1232 is connected to the front rod section 1231. The air extraction channel of the support rod 123 includes the inner cavity of the front rod section 1231 and the inner cavity of the rear rod section 1232. The rear rod section 1232 has a cylindrical structure to ensure smooth air extraction and guarantee air extraction efficiency.

[0137] The vacuum sealing method, equipment, and support rod for packaging bags provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A vacuum sealing method of a packaging bag, characterized by, The step of flattening the bag opening includes: inserting two support rods into the middle area of the horizontally placed bag opening of the packaging bag; controlling the two support rods to move synchronously and oppositely along the extension direction of the bag opening to flatten the lower bag surface of the bag opening; then lowering the packaging bag to a set position, and controlling the two support rods to continue moving synchronously and oppositely during the lowering process to flatten the upper bag surface of the bag opening.

2. The vacuum sealing method of a packaging bag according to claim 1, wherein, The step of flattening the bag opening is followed by a step of clamping the bag opening, which includes: controlling the movable part of the sealing assembly to move downward to press the flattened bag opening against the fixed part of the sealing assembly; controlling the two clamping members to move toward each other along the extension direction of the bag opening and clamp the bag edges on both sides of the bag opening; controlling the movable part of the sealing assembly to move upward back to the original position, and then controlling the two support rods to move synchronously and toward each other to a vacuum position; wherein the support rods have channels for vacuuming; controlling the two clamping members to move away from each other along the extension direction of the bag opening to flatten the bag opening.

3. The vacuum sealing method of a packaging bag according to claim 2, wherein The step of clamping the bag opening is followed by a step of vacuuming, which includes: controlling the movable part of the sealing assembly to move downward again to press the bag opening, so that the support rods are sealed with the bag opening; controlling the two support rods to move synchronously to vacuum the packaging bag to a set vacuum degree; controlling the two support rods to move away from the bag opening.

4. The vacuum sealing method of a packaging bag according to any one of claims 1 to 3, characterized in that, The step of flattening the bag opening is preceded by a step of feeding the bag, which includes: placing the packaging bag on the carrying platform and driving the carrying platform to move horizontally to feed the bag opening of the packaging bag to a position where a supporting plate is located, with the bag opening above the supporting plate; controlling the supporting plate to move upward to lift the lower surface of the bag opening to a position that is lower than the support rods and higher than the sealing height, and then controlling the supporting plate to move downward to move away from the bag opening; controlling the carrying platform to continue moving horizontally to feed the bag opening to a sealing position.

5. The vacuum sealing method of a packaging bag according to claim 4, wherein The carrying platform includes supporting rollers for supporting the packaging bag, and the supporting rollers are rotatable to allow the packaging bag to have a degree of freedom in moving along the extension direction of the bag opening.

6. A vacuum sealing apparatus for packaging bags, characterized in that The device includes a first frame and a second frame, the first frame is provided with a flattening assembly, the flattening assembly includes a first driving part, a second driving part and two support rods, the two support rods are arranged along a first horizontal direction, the first driving part is used to drive the two support rods to move synchronously and toward each other or away from each other along the first horizontal direction, and the second driving part is used to drive the two support rods to move synchronously along a second horizontal direction, which is perpendicular to the first horizontal direction; the second frame is provided with a third driving part, a fourth driving part and a carrying platform, the carrying platform is used to support the packaging bag, the third driving part is used to drive the carrying platform to move along the second horizontal direction, and the fourth driving part is used to drive the carrying platform to move vertically. The second driving part can drive the two support rods to be inserted into the middle area of the opening of the horizontally placed packaging bag; the first driving part can drive the two support rods inserted into the middle area of the opening to move away from each other along the first horizontal direction to support the lower bag surface of the opening; the fourth driving part can drive the supporting platform to descend after the lower bag surface of the opening is supported flat, and the first driving part can also drive the two support rods to continue to move away from each other synchronously during the descending of the supporting platform.

7. The apparatus for vacuum sealing of a bag according to claim 6, wherein, The first rack is provided with a sealing assembly and a clamping assembly; The sealing assembly comprises a first movable part and a first fixed part, the first fixed part is located below the support rod, and the first movable part is located above the first fixed part and can move vertically to approach or move away from the first fixed part; The clamping assembly comprises two clamping pieces arranged along the first horizontal direction, and the two clamping pieces are respectively located outside the two support rods, and the clamping pieces can move along the first horizontal direction to clamp the side bag edge of the packaging bag.

8. The apparatus for vacuum sealing of a bag according to claim 7, wherein, The first rack is provided with a limiting structure for limiting the position of the clamping piece when moving towards the support rod.

9. The apparatus for vacuum sealing of a bag according to claim 6, wherein, The first rack is provided with a vacuum pumping assembly, the vacuum pumping assembly comprises an air pumping device and the support rod, and the support rod has a channel for communicating with the air pumping device.

10. The apparatus for vacuum sealing of a bag according to claim 7, wherein, The first rack is provided with a sealing assembly, the sealing assembly comprises a second movable part and a second fixed part, the second fixed part is located on the rear side of the first fixed part, and the supporting surface of the first fixed part and the supporting surface of the second fixed part are in the same horizontal plane, and the second movable part can move vertically to approach or move away from the second fixed part; The first rack is provided with a supporting plate and a fifth driving part, the supporting plate is located on the front side of the first fixed part, and the fifth driving part is used to drive the supporting plate to rise and fall to lift the opening of the packaging bag.

11. A vacuum-sealing apparatus for packaging bags as claimed in any one of claims 6 to 10, wherein, The supporting platform comprises a rotatable supporting roller for supporting the packaging bag, and the rotation center line of the supporting roller is parallel to the second horizontal direction.

12. The apparatus for vacuum sealing of a bag according to claim 11, wherein, The second rack is provided with two positioning plates, and the two positioning plates are located on both sides of the supporting platform in the first horizontal direction, and the positioning plates can move towards or away from the supporting platform along the first horizontal direction to limit the relative position of the packaging bag and the supporting platform.

13. A vacuum sealer for bags as claimed in any one of claims 6 to 10, wherein, The support rod is used for supporting the opening of the packaging bag and pumping air in the packaging bag; the support rod comprises a front rod section for being inserted into the packaging bag, the front rod section has a first dimension in the first horizontal direction and a second dimension in the vertical direction, and the first dimension is greater than the second dimension.

14. The apparatus for vacuum sealing of a bag according to claim 13, wherein, The first dimension is at least three times the second dimension, and / or the inner cavity of the front rod section is provided with at least one supporting part extending along the length direction of the front rod section, and the supporting part divides the corresponding channel of the front rod section into two or more parallel sub-cavities.

15. The apparatus for vacuum sealing of a bag according to claim 14, wherein, The cross section of the front rod section is in the shape of a rhombus.

16. The apparatus for vacuum sealing of a bag according to claim 13, wherein, The strut further comprises a rear rod segment connected with the front rod segment, an inner cavity of the rear rod segment communicates with the inner cavity of the front rod segment, the channel of the strut comprises the inner cavity of the front rod segment and the inner cavity of the rear rod segment; the rear rod segment is in a cylindrical structure.

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