An ultrasonic backsealing device

Abstract

The utility model discloses an ultrasonic back sealing device is equipped with the feed end and the discharge end, and the back sealing device includes: at least two interval arrangement setting's conveying pressure wheel subassembly, conveying pressure wheel subassembly includes conveying power wheel and conveying auxiliary unit, a plurality of conveying pressure wheel subassembly is respectively set as first pressure wheel subassembly, second pressure wheel subassembly, and the conveying speed of first pressure wheel subassembly is less than second pressure wheel subassembly, set up in the ultrasonic sealing subassembly between two conveying pressure wheel subassembly, drive subassembly, drive subassembly drive conveying power wheel rotation, wherein, two conveying power wheels are through conveying wheel linkage structure transmission connection, and the speed difference of conveying wheel linkage structure adjustable two conveying power wheels. Through the linear velocity difference between second linear velocity and first linear velocity, can make the constant tension of packaging film, to promote sealing stability and quality. And through setting up conveying wheel linkage structure, can adjust the speed ratio of the rotating speed of two conveying pressure wheel subassembly's conveying power wheel, thereby guaranteeing packaging film tension.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, and in particular to an ultrasonic back sealing device. Background Technology

[0002] In existing packaging machinery technology, back sealing devices are typically used to seal the packaging film longitudinally during the packaging process to form a bag-like structure.

[0003] Currently, common back sealing devices have relatively simple structures, mainly consisting of two core functional components: a conveying pressure roller assembly and a sealing assembly.

[0004] A conveyor roller assembly typically consists of a pair of cooperating drive rollers (such as rubber rollers) and pressure rollers (such as silicone rollers). The main function of this assembly is to clamp and drive the packaging film forward continuously and stably, providing feed power for the subsequent sealing process.

[0005] A sealing assembly typically consists of a pair of pressing mechanisms with heating elements (such as heat sealing blocks or heat sealing blades). The main function of this assembly is to apply heat and pressure to the overlapping film edges as the packaging film travels to a predetermined position, causing them to melt and press together to complete the longitudinal sealing.

[0006] However, in practical applications, relying solely on a single conveyor roller assembly to propel the packaging film forward often fails to ensure sufficient tension at the sealing assembly. Factors such as changes in film elasticity, resistance fluctuations, or inconsistent conveyor path lengths during transport can easily lead to film loosening, wrinkles, or insufficient tension at the sealing point. This instability in the film's condition directly affects the heat-sealing effect of the sealing assembly, resulting in quality problems such as weak seals, bubbling, incomplete seals, or seal misalignment, thereby reducing the pass rate and appearance quality of the packaged products.

[0007] In addition, some high-requirement packaging applications (such as automatic metering packaging of powder, granules, and liquid materials) have higher standards for sealing strength and sealing performance. If the sealing quality is unstable, problems such as packaging damage, air leakage, and seepage may occur, which will seriously affect the product's shelf life and market circulation safety. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide an ultrasonic back sealing device to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0009] The solution to the technical problem of this utility model is: An ultrasonic back-sealing device is provided with a first direction, a second direction, and a third direction that are orthogonal to each other, with its two ends in the first direction respectively serving as an inlet and an outlet. The back-sealing device includes: The conveying roller assembly includes at least two components, which are arranged at intervals along a first direction. Each conveying roller assembly includes a conveying power wheel and a conveying auxiliary unit, which are arranged along a second direction. The linear velocity of a point on the outer circumferential surface of the conveying power wheel is defined as the conveying speed. The two conveying roller assemblies are respectively designated as a first roller assembly and a second roller assembly. The first roller assembly is located on the side of the second roller assembly closer to the feed end. The conveying speed of the first roller assembly is defined as a first linear velocity, and the conveying speed of the second roller assembly is defined as a second linear velocity. The first linear velocity is not greater than the second linear velocity. An ultrasonic sealing assembly is disposed between the two conveying roller assemblies; the ultrasonic sealing assembly uses ultrasonic waves to seal the packaging bag. A drive assembly drives the conveying power wheels to rotate about an axis parallel to a third direction; wherein, the two conveying power wheels are connected by a conveying wheel linkage structure, which is used to adjust the speed difference between the first linear velocity and the second linear velocity.

[0010] As a further improvement to the above technical solution, the conveying auxiliary unit is a wheel-shaped component, and the conveying auxiliary unit can rotate about an axis parallel to a third direction.

[0011] As a further improvement to the above technical solution, the conveying roller assembly also includes a spacing adjustment structure, which is used to adjust the spacing between the conveying power roller and the conveying auxiliary unit.

[0012] As a further improvement to the above technical solution, the spacing adjustment structure includes: A spacing adjustment component is provided with an adjustment connection part and an eccentric adjustment part; the eccentric adjustment part is connected to the conveying auxiliary unit, and the eccentric adjustment part is used to make the conveying auxiliary unit move closer to or further away from the conveying power wheel along a second direction; An adjustable connecting member is provided, comprising a first connecting part and a second connecting part, wherein the first connecting part is hinged to the second connecting part, the second connecting part is slidably connected to the adjustable connecting part, and the second connecting part is slidably movable relative to the adjustable connecting part along the radial direction of the adjustable connecting part; An adjustment drive component is provided, which is used to drive the adjustment connection component to move along a second direction.

[0013] As a further improvement to the above technical solution, the ultrasonic sealing assembly includes: A sealing drive wheel is connected to the drive assembly, and the drive assembly drives the sealing drive wheel to rotate about an axis parallel to a third direction; A sealing auxiliary unit, wherein the sealing power wheel and the sealing auxiliary unit are arranged along a second direction.

[0014] As a further improvement to the above technical solution, the drive component also includes a sealing linkage structure, wherein the sealing power wheel and one of the conveying power wheels are connected by a sealing linkage structure.

[0015] As a further improvement to the above technical solution, the conveyor wheel linkage structure includes: The conveying linkage wheel is provided in two parts, which are respectively designated as the first linkage wheel and the second linkage wheel. The first linkage wheel is driven by the conveying power wheel of the first pressure wheel assembly, and the two conveying linkage wheels are driven by the two conveying power wheels respectively. The outer diameter of at least one of the conveying linkage wheels varies along a first changing direction, which is parallel to the axial direction of the conveying linkage wheel. A conveyor belt passes over two conveyor pulleys and is connected to the two conveyor pulleys in a driving connection. A belt adjusting component is used to drive the conveyor belt to adjust its position along the axial direction of the conveyor pulley.

[0016] As a further improvement to the above technical solution, the outer peripheral surface of the conveying linkage wheel is set as a frustum.

[0017] As a further improvement to the above technical solution, the outer peripheral surfaces of both conveying linkage wheels are set as frustum surfaces.

[0018] As a further improvement to the above technical solution, the first change directions of the two conveying linkage wheels are set in opposite directions, so that the distance between the farthest ends of the two conveying linkage wheels is constant.

[0019] The beneficial effects of this invention are as follows: By utilizing the linear velocity difference between the second and first linear velocities, the packaging film between the first and second pressure roller assemblies can maintain a constant tension, thereby improving sealing stability and quality. Furthermore, by setting a conveyor wheel linkage structure, the two conveyor linkage wheels can have different speed ratios, thus adjusting the speed ratio of the conveying power wheels of the two conveyor pressure roller assemblies, thereby ensuring the packaging film tension.

[0020] This utility model relates to the field of packaging equipment technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 yes Figure 1 A magnified view of part A in the middle; Figure 3 This is a schematic diagram of the overall structure of a portion of an embodiment of the present utility model; Figure 4 This is a schematic diagram of the overall structure of the conveyor roller assembly of this utility model; Figure 5 This is a schematic diagram of the overall structure of the ultrasonic sealing assembly of this utility model.

[0023] In the diagram, 100 is the frame; 200 is the conveying pressure roller assembly; 201 is the first pressure roller assembly; 202 is the second pressure roller assembly; 210 is the conveying auxiliary unit; 220 is the conveying power wheel; 230 is the spacing adjustment structure; 231 is the spacing adjustment component; 232 is the adjustment connecting component; 233 is the adjustment driving component; 240 is the embossing teeth; 300 is the ultrasonic sealing assembly; 310 is the sealing power wheel; 320 is the sealing auxiliary unit; 330 is the ultrasonic transducer; 411 is the eccentric adjustment part; 412 is the adjustment connecting part; 413 is the adjustment sliding groove; 42 is the eccentric adjustment part. 1. Second connecting component; 422. First connecting component; 431. Adjusting drive sleeve; 432. Adjusting drive shaft; 433. Adjusting drive handle; 434. Adjusting threaded groove; 435. Adjusting connecting block; 500. Drive assembly; 501. Drive structure; 510. Conveyor wheel linkage structure; 511. Conveyor linkage wheel; 512. Conveyor linkage belt; 513. Belt adjusting component; 520. Sealing linkage structure; 531. Belt adjusting drive unit; 532. Belt adjusting unit; 533. Belt adjusting rotating shaft; 534. Belt adjusting moving sleeve. Detailed Implementation

[0024] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages mentioned herein do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In existing packaging machinery technology, back sealing devices are typically used to seal the packaging film longitudinally during the packaging process to form a bag-like structure.

[0028] Currently, common back sealing devices have relatively simple structures, mainly consisting of two core functional components: a conveying pressure roller assembly and a sealing assembly.

[0029] A conveyor roller assembly typically consists of a pair of cooperating drive rollers (such as rubber rollers) and pressure rollers (such as silicone rollers). The main function of this assembly is to clamp and drive the packaging film forward continuously and stably, providing feed power for the subsequent sealing process.

[0030] A sealing assembly typically consists of a pair of pressing mechanisms with heating elements (such as heat sealing blocks or heat sealing blades). The main function of this assembly is to apply heat and pressure to the overlapping film edges as the packaging film travels to a predetermined position, causing them to melt and press together to complete the longitudinal sealing.

[0031] However, in practical applications, relying solely on a single conveyor roller assembly to propel the packaging film forward often fails to ensure sufficient tension at the sealing assembly. Factors such as changes in film elasticity, resistance fluctuations, or inconsistent conveyor path lengths during transport can easily lead to film looseness, wrinkles, or insufficient tension at the sealing point. This instability in the film's condition directly affects the heat-sealing effect of the sealing assembly, resulting in quality problems such as weak seals, bubbling, incomplete seals, or seal misalignment, thereby reducing the pass rate and appearance quality of the packaged products.

[0032] This solution was designed to address the aforementioned technical problems.

[0033] Reference Figures 1 to 5 There are a first direction, a second direction, and a third direction. The first direction, the second direction, and the third direction are set perpendicular to each other. The first direction is set parallel to the X-axis in the figure, the second direction is set parallel to the Y-axis in the figure, and the third direction is set parallel to the Z-axis in the figure.

[0034] An ultrasonic back-sealing device has an inlet and an outlet at its two ends, which are arranged along a first direction. The ultrasonic back-sealing device includes a frame 100, a conveying roller assembly 200, and an ultrasonic sealing assembly 300.

[0035] In this embodiment, the number of conveying pressure roller assemblies 200 is set to two, and the two conveying pressure roller assemblies 200 are arranged at intervals along the first direction.

[0036] Specifically, the conveying roller assembly 200 includes: a conveying auxiliary unit 210, a conveying power wheel 220, and a spacing adjustment structure 230. The conveying auxiliary unit 210 and the conveying power wheel 220 are arranged at intervals along the second direction. When this ultrasonic back sealing device is working, the packaging film is clamped by the conveying auxiliary unit 210 and the conveying power wheel 220, and the conveying power wheel 220 rotates to drive the packaging film forward.

[0037] The conveying drive wheel 220 is rotatably mounted on the frame 100. Naturally, a bearing is provided between the rotating shaft of the conveying drive wheel 220 and the frame 100 to reduce friction between them. The linear velocity of a point on the outer circumferential surface of the conveying drive wheel 220 is defined as the conveying speed.

[0038] Specifically, in this embodiment, the conveying auxiliary unit 210 is configured as a wheel-shaped structure, and the conveying auxiliary unit 210 and the frame 100 can rotate relative to each other. By configuring the conveying auxiliary device as a wheel-shaped structure and making it rotatable, the friction between the packaging film and the conveying auxiliary device during the forward conveying process can be reduced, thereby avoiding damage to the packaging film due to severe friction with the conveying auxiliary device.

[0039] In other embodiments, the conveying auxiliary unit 210 may also be configured as a rectangular block structure. Those skilled in the art can select the specific structure of the conveying auxiliary unit 210 according to actual needs.

[0040] The spacing adjustment structure 230 is used to adjust the spacing between the conveying power wheel 220 and the conveying auxiliary unit 210. Specifically, the spacing adjustment structure 230 includes: a spacing adjustment component 231, an adjustment connection component 232, and an adjustment drive component 233.

[0041] The spacing adjustment component 231 is rotatably mounted on the frame 100. A rolling bearing is provided between the spacing adjustment component 231 and the frame 100 to reduce friction between them. The spacing adjustment component 231 is provided with an eccentric adjustment part 411 and an adjustment connection part 412. The eccentric adjustment part 411 is located above the adjustment connection part 412, and the eccentric adjustment part 411 and the adjustment connection part 412 are fixedly connected.

[0042] The central axis of the eccentric adjustment section 411 is arranged parallel to the central axis of the adjustment connection section 412, and the central axis of the eccentric adjustment section 411 is eccentrically located on one side of the central axis of the adjustment connection section 412. The conveying auxiliary unit 210 is rotatably mounted on the eccentric adjustment section 411, so that the conveying auxiliary unit 210 can move with the eccentric adjustment section 411 relative to the frame 100, thereby causing the conveying auxiliary unit 210 to move closer to or further away from the conveying power wheel 220 in the second direction.

[0043] The adjusting connecting member 232 is slidably mounted on the frame 100 and can move relative to the frame 100 in a second direction. The adjusting connecting member 232 includes a second connecting member 421 and a first connecting member 422, which are hinged together. The adjusting connecting portion 412 has an adjusting sliding groove 413 extending radially along the adjusting connecting portion 412. The end of the second connecting member 421 away from the first connecting member 422 is inserted into the adjusting sliding groove 413, and the second connecting member 421 is slidably connected to the adjusting connecting portion 412, allowing it to slide radially relative to the adjusting connecting portion 412. When the adjusting connecting member 232 moves in the second direction, the second connecting member 421 can rotate the adjusting connecting portion 412, thereby adjusting the position of the eccentric adjusting portion 411.

[0044] The adjustment drive component 233 is used to drive the adjustment connecting component 232 to move along the second direction. Specifically, the adjustment drive component 233 includes an adjustment drive sleeve 431, an adjustment drive shaft 432, and an adjustment drive handle 433. The adjustment drive sleeve 431 is fixedly installed on the frame 100 and has an adjustment threaded groove 434 that extends along the second direction. The adjustment drive shaft 432 is rotatably connected to the frame 100, and its rotation axis is parallel to the second direction. The adjustment drive shaft 432 has an adjustment connecting block 435, which is disposed within the adjustment threaded groove 434 and is slidably connected to it. When the adjustment drive shaft 432 rotates, the adjustment drive handle 433 is fixedly connected to the end of the adjustment drive shaft 432.

[0045] When the position of the eccentric adjustment part 411 needs to be adjusted, the operator manually rotates the adjustment drive handle 433 to drive the adjustment drive shaft 432 to rotate. The adjustment connecting block 435 moves along the adjustment thread groove 434, causing the adjustment drive shaft 432 to move in the second direction. The adjustment connecting member 232 drives the eccentric adjustment part 411 to move relative to the frame 100, thereby realizing the adjustment of the position of the conveying auxiliary unit 210.

[0046] Two conveying roller assemblies 200 are respectively designated as a first roller assembly 201 and a second roller assembly 202. The first roller assembly 201 is positioned on the side of the second roller assembly 202 closer to the feed end. The linear velocity of the first roller assembly 201 is set to a first linear velocity, and the linear velocity of the second roller assembly 202 is set to a second linear velocity. The difference in linear velocity between the first and second roller assemblies maintains a constant tension in the packaging film between the first and second roller assemblies 201, thereby improving sealing stability and quality.

[0047] Specifically, in this embodiment, the outer peripheral surface of the conveying power wheel 220 of the first pressure roller assembly 201 is provided with embossed teeth 240. The embossed teeth 240 are used to process the back seal of the packaging film into a wavy structure to improve the aesthetics of the bag and the sealing strength.

[0048] The ultrasonic sealing assembly 300 is disposed between the two conveying pressure roller assemblies 200. Specifically, the ultrasonic sealing assembly 300 includes a sealing power roller 310, a sealing auxiliary unit 320, and an ultrasonic transducer 330.

[0049] The sealing drive wheel 310 is rotatably connected to the frame 100, and the rotation axis of the sealing drive wheel 310 is parallel to the third direction.

[0050] The sealing auxiliary unit 320 and the sealing power wheel 310 are arranged along the second direction. Specifically, in this embodiment, the sealing auxiliary unit 320 is configured as a wheel-shaped component. The sealing auxiliary unit 320 can be adjusted in position relative to the frame 100 along the second direction, and the sealing auxiliary unit 320 can rotate relative to the frame 100. The axis of rotation of the sealing auxiliary unit 320 is parallel to the third direction. In other embodiments, the sealing auxiliary unit 320 can also be configured as a single-piece component. Those skilled in the art can select the specific structure of the sealing auxiliary unit 320 according to actual needs.

[0051] The rotating shaft of the sealing auxiliary unit 320 and the rotating shaft of the sealing power wheel 310 are driven by two meshing spur gears, and the gear parameters of the two spur gears are the same, so that the sealing auxiliary unit 320 and the sealing power wheel 310 can rotate synchronously and at the same speed.

[0052] In other embodiments, the transmission method between the rotating shaft of the sealing auxiliary unit 320 and the rotating shaft of the sealing power wheel 310 can also be set as belt drive or chain drive, etc. Those skilled in the art can select the transmission method between the rotating shaft of the sealing auxiliary unit 320 and the rotating shaft of the sealing power wheel 310 according to actual needs.

[0053] The ultrasonic transducer 330 is fixedly connected to the sealing auxiliary unit 320. The ultrasonic transducer 330 generates ultrasonic waves, which are transmitted to the sealing auxiliary unit 320. Together with the sealing power wheel 310, the ultrasonic waves achieve back sealing of the packaging film. The ultrasonic sealing component 300 in this solution achieves heat-free sealing by transmitting high-frequency vibration to the film material, thereby improving sealing accuracy and cleanliness.

[0054] The drive assembly 500 is used to drive the conveying power wheel 220 and the sealing power wheel 310 to rotate about an axis parallel to the third direction. The drive assembly 500 includes a drive structure 501, a conveying wheel linkage structure 510 and a sealing linkage structure 520.

[0055] The drive structure 501 is configured as a servo motor.

[0056] Two conveyor wheels 220 are connected by a conveyor wheel linkage structure 510, which is used to adjust the speed difference between the first linear speed and the second linear speed.

[0057] Specifically, the conveyor wheel linkage structure 510 includes: a conveyor linkage wheel 511, a conveyor linkage belt 512, and a belt adjustment component 513.

[0058] The number of conveying linkage wheels 511 is set to two, which are respectively designated as the second linkage wheel and the first linkage wheel. The conveying linkage wheels 511 are connected to the conveying power wheel 220 through conventional gear transmission structures such as bevel gears. The first linkage wheel is connected to the conveying power wheel 220 of the first pressure wheel assembly 201, and the second linkage wheel is connected to the conveying power wheel 220 of the second pressure wheel assembly 202.

[0059] The conveyor belt 512 passes over two conveyor pulleys 511, and the conveyor belt 512 is connected to the conveyor pulleys 511 in a driving connection.

[0060] The belt adjustment component 513 includes a belt adjustment drive unit 531 and a belt adjustment unit 532.

[0061] The belt adjustment drive unit 531 includes a belt adjustment shaft 533 and a belt adjustment moving sleeve 534. The belt adjustment shaft 533 is rotatably connected to the frame 100. A rotating head is provided at one end of the belt adjustment shaft 533, and a threaded structure is provided at the end of the belt adjustment shaft 533 away from the rotating head. The belt adjustment moving sleeve 534 is threadedly connected to the belt adjustment shaft 533. When the operator turns the rotating head, the belt adjustment shaft 533 rotates, and the belt adjustment moving sleeve 534 moves relative to the frame 100 in a second direction.

[0062] The belt adjusting unit 532 is a wheel-shaped structure. The belt adjusting unit 532 is rotatably connected to the belt adjusting moving sleeve 534. The belt adjusting unit 532 moves along the second direction with the belt adjusting moving sleeve 534. The belt adjusting unit 532 has an annular adjusting limit groove. The conveying linkage belt 512 is set in the adjusting limit groove and is limited by the two side walls of the adjusting limit groove. When the belt adjusting unit 532 moves along the second direction, the belt adjusting unit 532 will drive the conveying linkage belt 512 to move along the second direction, thereby achieving the effect of adjusting the position of the conveying linkage belt 512 in the second direction.

[0063] Specifically, the outer diameter of the conveying linkage wheel 511 gradually changes or changes in a stepped manner along a first direction of change, and the first direction of change is parallel to the axial direction of the conveying linkage wheel 511. In this embodiment, the outer peripheral surface of the conveying linkage wheel 511 is set as a frustum, and the outer diameter of the conveying linkage wheel 511 gradually changes along the first direction of change. In other embodiments, the conveying linkage wheel 511 can also be set as a stepped wheel structure. Those skilled in the art can select the specific structure of the conveying linkage wheel 511 according to actual needs.

[0064] Specifically, in this embodiment, the outer diameters of the two conveying linkage wheels 511 gradually change along the first direction of change, and the first direction of change of the two conveying linkage wheels 511 is set in opposite directions, so that the distance between the farthest ends of the two conveying linkage wheels 511 is always equal. The tension of the conveying linkage belt 512 can be achieved by the specific structure of the two conveying linkage wheels 511 alone, thereby avoiding the need to set up an additional tensioning mechanism to maintain the tension of the conveying linkage belt 512, so that the structure of the conveying wheel linkage structure 510 is simpler.

[0065] When the conveyor belt 512 is adjusted in the second direction, since the outer diameters of the two conveyor wheels 511 gradually change in the first direction, the ratio of the outer diameters of the two conveyor wheels 511 is different at different positions in the second direction. This allows the two conveyor wheels 511 to have different speed ratios, thereby adjusting the speed ratio of the conveyor power wheels 220 of the two conveyor pressure roller assemblies 200, thus ensuring that the packaging film can be tensioned.

[0066] The sealing linkage structure 520 includes two meshing sealing linkage gears with identical gear parameters. One sealing linkage gear is connected to the conveying power wheel 220 of the first pressure roller assembly 201, and the other sealing linkage gear is connected to the sealing power wheel 310, so that the sealing power wheel 310 can move synchronously with the conveying power wheel 220 of the first pressure roller assembly 201, thereby ensuring the quality of the back seal.

[0067] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An ultrasonic back-sealing device, comprising a first direction, a second direction, and a third direction that are orthogonal to each other, wherein the two ends of the device in the first direction are respectively configured as an inlet end and an outlet end, characterized in that: The back sealing device includes: The conveying roller assembly includes at least two components, which are arranged at intervals along a first direction. Each conveying roller assembly includes a conveying power wheel and a conveying auxiliary unit, which are arranged along a second direction. The linear velocity of a point on the outer circumferential surface of the conveying power wheel is defined as the conveying speed. The two conveying roller assemblies are respectively designated as a first roller assembly and a second roller assembly. The first roller assembly is located on the side of the second roller assembly closer to the feed end. The conveying speed of the first roller assembly is defined as a first linear velocity, and the conveying speed of the second roller assembly is defined as a second linear velocity. The first linear velocity is not greater than the second linear velocity. An ultrasonic sealing assembly is disposed between the two conveying roller assemblies; the ultrasonic sealing assembly uses ultrasonic waves to seal the packaging bag. A drive assembly drives the conveying power wheels to rotate about an axis parallel to a third direction; wherein, the two conveying power wheels are connected by a conveying wheel linkage structure, which is used to adjust the speed difference between the first linear velocity and the second linear velocity.

2. The ultrasonic back-sealing device according to claim 1, characterized in that: The conveying auxiliary unit is a wheel-shaped component, and the conveying auxiliary unit can rotate about an axis parallel to a third direction.

3. The ultrasonic back-sealing device according to claim 1, characterized in that: The conveying roller assembly also includes a spacing adjustment structure, which is used to adjust the spacing between the conveying power roller and the conveying auxiliary unit.

4. An ultrasonic back-sealing device according to claim 3, characterized in that: The spacing adjustment structure includes: A spacing adjustment component is provided with an adjustment connection part and an eccentric adjustment part; the eccentric adjustment part is connected to the conveying auxiliary unit, and the eccentric adjustment part is used to make the conveying auxiliary unit move closer to or further away from the conveying power wheel along a second direction; An adjustable connecting member is provided, comprising a first connecting part and a second connecting part, wherein the first connecting part is hinged to the second connecting part, the second connecting part is slidably connected to the adjustable connecting part, and the second connecting part is slidably movable relative to the adjustable connecting part along the radial direction of the adjustable connecting part; An adjustment drive component is used to drive the adjustment connection component to move along a second direction.

5. An ultrasonic back-sealing device according to claim 1, characterized in that: The ultrasonic sealing assembly includes: A sealing drive wheel is connected to the drive assembly, and the drive assembly drives the sealing drive wheel to rotate about an axis parallel to a third direction; A sealing auxiliary unit, wherein the sealing power wheel and the sealing auxiliary unit are arranged along a second direction.

6. An ultrasonic back-sealing device according to claim 5, characterized in that: The drive assembly also includes a sealing linkage structure, wherein the sealing power wheel and one of the conveying power wheels are connected by a sealing linkage structure.

7. An ultrasonic back-sealing device according to claim 1, characterized in that: The conveyor wheel linkage structure includes: The conveying linkage wheel is provided in two parts, which are respectively designated as the first linkage wheel and the second linkage wheel. The first linkage wheel is driven by the conveying power wheel of the first pressure wheel assembly, and the two conveying linkage wheels are driven by the two conveying power wheels respectively. The outer diameter of at least one of the conveying linkage wheels varies along a first changing direction, which is parallel to the axial direction of the conveying linkage wheel. A conveyor belt passes over two conveyor pulleys and is connected to the two conveyor pulleys in a driving connection. A belt adjusting component is used to drive the conveyor belt to adjust its position along the axial direction of the conveyor pulley.

8. An ultrasonic back-sealing device according to claim 7, characterized in that: The outer circumferential surface of the conveying linkage wheel is designed as a frustum.

9. An ultrasonic back-sealing device according to claim 8, characterized in that: The outer circumferential surfaces of both conveying linkage wheels are designed as frustum surfaces.

10. An ultrasonic back-sealing device according to claim 9, characterized in that: The first change direction of the two conveying linkage wheels is set in opposite directions, so that the distance between the farthest ends of the two conveying linkage wheels is constant.

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