Sealing mechanism capable of adaptively adjusting pressure

Abstract

The utility model discloses a sealing mechanism capable of adaptively adjusting pressure, which relates to the technical field of express packaging and comprises a fixed pressing component, a movable pressing component and a guide rod structure for connecting the fixed pressing component and the movable pressing component. The fixed press-fit assembly is fixedly installed, guide rods on the two sides of the fixed press-fit assembly are elastically connected with the movable press-fit assembly through elastic structures, and the movable press-fit assembly is driven by double synchronous belts or a single synchronous belt to achieve accurate linear motion. The fixed pressing assembly is integrated with a heating wire assembly and a bag pulling rubber strip, the movable pressing assembly is provided with a pressing rubber strip and a tight pulling pressing edge with a chamfer, and when the pressing rubber strip and the tight pulling pressing edge are pressed, the double functions of heat sealing and mechanical locking are achieved. And the elastic structure adopts the design of a compression spring and a limiting convex cover, so that elastic pressure is continuously kept during pressing of the movable pressing assembly, the pressing force is adjusted in a self-adaptive manner, and hard collision is avoided. The mechanism solves the problems that a traditional sealing device is unstable in press fit and poor in sealing quality, the sealing strength is improved, the bag pulling slippage rate is reduced, and the mechanism is suitable for high-speed automatic express packaging operation.

Description

Technical Field

[0001] This utility model relates to the field of express packaging machine technology, and in particular to a sealing mechanism that adaptively adjusts pressure. Background Technology

[0002] With the rapid development of e-commerce, the volume of logistics parcels is growing exponentially. Traditional express packaging processes rely on manual labor for tasks such as labeling and sealing, resulting in efficiency bottlenecks (daily processing volume ≤3000 pieces), a label mislabeling rate as high as 2.3%, and labor costs accounting for over 45% of industry pain points. Therefore, fully automated express packaging machines are necessary for improvement. Existing automation solutions, such as the intelligent express packaging machine proposed in the Chinese utility model patent with application number "CN202021527663.6" and patent name "Intelligent Express Packaging Machine," include a label printing and labeling machine. The label printing and labeling machine has a feeding roller movably connected internally via pins. An industrial control integrated machine and a control board are fixedly connected to both sides of the top of the label printing and labeling machine. A heat sealing machine and a conveyor are fixedly connected to the top and bottom of the left side of the label printing and labeling machine, respectively. The industrial control integrated machine is electrically connected to the control board, the heat sealing machine, and the conveyor.

[0003] When the heat sealing machine in this intelligent express packaging machine is working, the operator puts the product into the express packaging bag, the heat sealing machine heat seals the packaging bag, then the packaging bag is torn off, the heat sealing knife is reset, and the product slides onto the conveyor and is transported out.

[0004] However, this heat-sealing mechanism has the following drawbacks: 1. The pressure strip is driven by a motor, and when the bag mouth is pressed, there is a hard collision between the pressure strip and the heating strip, resulting in a high failure rate; 2. There is no locking mechanism between the pressure strip and the heating strip, which makes it easy to loosen and result in poor sealing effect; 3. The pressing force between the pressure strip and the heating strip is small, making it difficult to stably clamp the plastic bag. When the bag is pulled off, it is easy to fall off, resulting in failure to pull the bag off. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a sealing mechanism that adaptively adjusts pressure. The pressing strip has elastic buffering properties when sealing bags and always has elastic potential energy toward the heating strip, ensuring that the pressing force is maintained during the heat sealing process, improving sealing quality and the stability of continuous packaging operations.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an adaptive pressure-adjusting sealing mechanism, comprising a fixed pressure assembly and a dynamic pressure assembly that press against each other. The fixed pressure assembly is fixedly installed, and a guide rod is slidably installed at each end of the fixed pressure assembly. The two guide rods are arranged parallel to each other, and their front ends are respectively connected to the corresponding sides of the dynamic pressure assembly. The two guide rods are respectively connected to a pressure driving device to drive the dynamic pressure assembly to move away from or towards the fixed pressure assembly. Furthermore, a heat-sealing structure is provided between the pressing surfaces of the fixed pressure assembly and the dynamic pressure assembly. An elastic structure is provided at the connection between the guide rod and the dynamic pressure assembly, and the two are elastically connected through the elastic structure. When the dynamic pressure assembly and the fixed pressure assembly are pressed against each other, the dynamic pressure assembly has an elastic tendency to move towards the fixed pressure assembly.

[0007] In a further technical solution, the elastic structure includes a connecting rod and a compression spring. The connecting rod is sequentially formed with a limiting convex cover, a smooth part, and a threaded part. A through hole is opened on each side of the dynamic pressing assembly. The smooth part of the connecting rod is movably inserted through the through hole, and its threaded part is threadedly connected to the guide rod. The end face of the guide rod contacts the inner side of the dynamic pressing assembly. The compression spring is sleeved on the smooth part of the connecting rod. One end of the compression spring sleeve contacts the limiting convex cover, and the other end contacts the outer side of the dynamic pressing assembly. The compression spring is normally in a compressed state.

[0008] In a further technical solution, each end of the compression spring is also connected to a limiting ring, which is sleeved on the smooth part of the connecting rod.

[0009] In further technical solutions, the compression spring includes a rectangular spring, a disc spring, or a rubber spring.

[0010] In a further technical solution, the constant pressure assembly includes a sealing mounting base, a heating wire assembly, and a bag-pulling adhesive strip. The outer surface of the sealing mounting base has an assembly groove, in which the heating wire assembly is embedded. A limiting groove is also provided at the top of the assembly groove, and the bag-pulling adhesive strip is snapped and fixed within the limiting groove. The dynamic pressure assembly includes an adhesive strip seat and a pressure adhesive strip. A guide rod is elastically connected to the side of the adhesive strip seat. A retaining groove is formed on the inner surface of the adhesive strip seat, in which the pressure adhesive strip is snapped and assembled. A retaining groove is provided at the top of the retaining groove. The lateral, inwardly protruding tightening edge has a top surface height that is not lower than the bottom surface height of the bag-tightening strip. The edge of the tightening edge is chamfered or rounded. When the pressing strip is assembled, the outer side of the pressing strip protrudes from the slot, and its protrusion height is greater than that of the tightening edge. When the dynamic pressing component and the fixed pressing component are pressed together, the pressing strip and the heating wire component are heat-sealed together. At the same time, the tightening edge and the bag-tightening strip are clamped together to tighten the bag opening.

[0011] In a further technical solution, a bearing seat is installed on each side of the sealing mounting base, and the bearing seat is equipped with a linear bearing. The guide rod is slidably connected to the corresponding bearing seat and the linear bearing.

[0012] In a further technical solution, the heating wire assembly includes, from the inside out, a heat insulation strip, a heating wire unit, and a high-temperature cloth. The heat insulation strip is embedded in the assembly groove. The two ends of the heating wire unit are fixedly connected to the ends of the heat insulation strip and are in close contact with the heat insulation strip. The high-temperature cloth covers the heat insulation strip and the heating wire unit.

[0013] In a further technical solution, the pressing drive device includes a single synchronous belt drive structure or a double synchronous belt drive structure.

[0014] In a further technical solution, the single synchronous belt drive structure includes a set of synchronous belt drive components, a drive motor, and a synchronous drive rod. The two ends of the synchronous drive rod are respectively fixedly connected to the guide rods on the corresponding sides. The synchronous belt drive component is located in the middle of the synchronous drive rod. The synchronous belt drive component includes a base frame, a synchronous pulley, an idler pulley, a belt unit, and a connecting member. The synchronous pulley and the idler pulley are rotatably mounted on both sides of the base frame. The belt unit is wound around and connected to the synchronous pulley and the idler pulley. The connecting member is fixed to the belt unit and is connected to the middle position of the synchronous drive rod. The drive motor is driven and connected to the synchronous pulley.

[0015] In a further technical solution, the dual synchronous belt drive structure includes two sets of synchronous belt drive assemblies, a drive motor, and a synchronous drive shaft. These two sets of synchronous belt drive assemblies are located on one side of a corresponding guide rod. Each synchronous belt drive assembly includes a base frame, a synchronous pulley, an idler pulley, a belt unit, and a connector. The synchronous pulley and idler pulley are rotatably mounted on both sides of the base frame. The belt unit is wound around and connected to the synchronous pulley and idler pulley. The connector is fixed to the belt unit, and a connecting block is provided on the top of the connector. The connecting block is fixed to the corresponding guide rod. Both ends of the synchronous drive shaft are fixed to the idler pulleys of the two sets of synchronous belt drive assemblies. The drive motor is driven and connected to the synchronous pulley of any one of the synchronous belt drive assemblies.

[0016] The advantages of this invention compared to the prior art after adopting the above structure are:

[0017] 1. Through the elastic connection structure between the guide rod and the dynamic pressing component, an elastic buffer mechanism is formed during the pressing process. The dynamic pressing component continuously maintains elastic potential energy toward the stationary pressing component during pressing, effectively avoiding component wear caused by hard collisions. At the same time, it adaptively adjusts the pressing force to ensure the uniformity of heat sealing pressure for packaging bags of different thicknesses, increasing the sealing strength by more than 30%.

[0018] 2. The system employs a surface-to-surface heat-sealing method between the pressing strip and the heating wire assembly, combined with a staggered clamping structure that tightens the pressing edge and pulls the bag strip (clamping force can reach 50-80N), achieving both heat sealing and mechanical locking. The bag opening slippage rate is reduced from 3.2% in traditional structures to below 0.5%, and wrinkles at the heat seal are reduced, further improving sealing strength.

[0019] 3. The synchronous drive shaft achieves a dual-side drive synchronization error of ≤0.1mm. Combined with the linear bearing guide structure, it ensures the parallel movement accuracy of the dynamic pressing assembly and effectively avoids the sealing wrinkles caused by single-side pressing. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the sealing mechanism mentioned in Embodiment 1 of this utility model.

[0022] Figure 2 This is a schematic diagram of the pressing and fitting of the constant pressing component and the dynamic pressing component in this utility model.

[0023] Figure 3 This is an exploded view of the elastic structure in this utility model.

[0024] Figure 4 This is a structural schematic diagram of the sealing mechanism mentioned in Embodiment 1 of the utility model from another perspective.

[0025] Figure 5 This is a schematic diagram of the sealing mechanism mentioned in Embodiment 2 of this utility model. Detailed Implementation

[0026] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention. Example

[0027] like Figures 1 to 4As shown, an adaptive pressure-adjusting sealing mechanism includes a fixed pressure assembly 1 and a dynamic pressure assembly 2 that press against each other. The fixed pressure assembly 1 is fixedly installed, and a guide rod 3 is slidably installed at each end of the fixed pressure assembly 1. The two guide rods 3 are arranged parallel to each other, and their front ends are respectively connected to the corresponding sides of the dynamic pressure assembly 2. The two guide rods 3 are respectively connected to a pressure driving device to drive the dynamic pressure assembly 2 to move away from or towards the fixed pressure assembly 1. A heat-sealing structure is provided between the pressing surfaces of the fixed pressure assembly 1 and the dynamic pressure assembly 2. An elastic structure is provided at the connection between the guide rod 3 and the dynamic pressure assembly 2, and the two are elastically connected through the elastic structure. When the dynamic pressure assembly 2 and the fixed pressure assembly 1 are pressed against each other, the dynamic pressure assembly 2 has an elastic tendency to move towards the fixed pressure assembly 1.

[0028] Through the elastic connection structure between the guide rod 3 and the dynamic pressing component 2, an elastic buffer mechanism is formed during the pressing process. The dynamic pressing component 2 continuously maintains elastic potential energy toward the fixed pressing component 1 during pressing, effectively avoiding component wear caused by hard collisions. At the same time, it adaptively adjusts the pressing force to ensure the uniformity of heat sealing pressure for packaging bags of different thicknesses, and improves the sealing strength by more than 30%.

[0029] Specifically, the elastic structure includes a connecting rod 32 and a compression spring 31. The connecting rod 32 is sequentially formed with a limiting convex cover, a smooth part 321, and a threaded part 322. A through hole 20 is opened on each side of the dynamic pressing assembly 2. The smooth part 321 of the connecting rod 32 is movably inserted through the through hole 20, and its threaded part 322 is threadedly connected to the internal threaded hole 30 on the end face of the guide rod 3. The end face of the guide rod 3 contacts the inner side of the dynamic pressing assembly 2. The compression spring 31 is sleeved on the smooth part 321 of the connecting rod 32. One end of the compression spring 31 contacts the limiting convex cover, and the other end contacts the outer side of the dynamic pressing assembly 2. The compression spring 31 is normally in a compressed state.

[0030] Specifically, each end of the compression spring 31 is also in contact with a limiting ring 33, which is sleeved on the smooth part 321 of the connecting rod 32.

[0031] Specifically, a rectangular spring was selected for the compression spring 31.

[0032] Specifically, the constant pressure assembly 1 includes a sealing mounting base, a heating wire assembly, and a bag-pulling adhesive strip 15. The outer surface of the sealing mounting base has an assembly groove 11, in which the heating wire assembly is embedded. A limiting groove is also provided at the upper part of the assembly groove 11, and the bag-pulling adhesive strip 15 is snapped and fixed within the limiting groove. The dynamic pressure assembly 2 includes an adhesive strip seat 21 and a pressure adhesive strip 22. A guide rod 3 is elastically connected to the side of the adhesive strip seat 21. A slot 210 is formed on the inner surface of the adhesive strip seat 21, in which the pressure adhesive strip 22 is snapped and assembled. A horizontal crossbar is provided at the upper part of the slot 210. The tightening edge 211 protrudes inward, and the top surface height of the tightening edge 211 is not lower than the bottom surface height of the bag-pulling strip 15. The edge of the tightening edge 211 is chamfered. When the pressing strip 22 is assembled, the outer side of the pressing strip 22 protrudes from the slot 210, and its protrusion height is greater than the protrusion height of the tightening edge 211. When the moving pressing component 2 and the fixed pressing component 1 are pressed together, the pressing strip 22 and the heating wire component are heat-sealed together. At the same time, the tightening edge 211 and the bag-pulling strip 15 are clamped together to tighten the bag opening.

[0033] The heat sealing method employs a surface-to-surface contact heat seal between the pressing strip 22 and the heating wire assembly, combined with a staggered clamping structure of the tightening edge 211 and the bag-pulling strip 15, achieving a clamping force of 50-80N, thus realizing the dual effects of heat sealing and mechanical locking. The bag opening slippage rate is reduced from 3.2% in traditional structures to below 0.5%, and wrinkles at the heat seal are reduced, further improving the sealing strength.

[0034] Specifically, a bearing seat 10 is installed on each side of the sealing mounting base. The bearing seat 10 is equipped with a linear bearing 101. The guide rod 3 is slidably connected to the corresponding bearing seat 10 and the linear bearing 101.

[0035] Specifically, the heating wire assembly includes, from the inside out, a heat insulation strip 12, a heating wire unit 13, and a high-temperature cloth 14. The heat insulation strip 12 is embedded in the assembly groove 11. The two ends of the heating wire unit 13 are fixedly connected to the ends of the heat insulation strip 12 and are in close contact with the heat insulation strip 12. The high-temperature cloth 14 covers the heat insulation strip 12 and the heating wire unit 13.

[0036] The pressing drive device in this embodiment adopts a single synchronous belt drive structure. The single synchronous belt drive structure includes a synchronous belt drive assembly 5, a drive motor 6, and a synchronous drive rod 4. Both ends of the synchronous drive rod 4 are fixedly connected to guide rods 3 on corresponding sides. A limiting top rod 41 is provided on the front side of the synchronous drive rod 4, and the limiting top rod 41 cooperates with the fixed pressing assembly 1 to block and limit movement. The synchronous belt drive assembly 5 is located in the middle position of the synchronous drive rod 4. The synchronous belt drive assembly 5 includes a base frame, a synchronous pulley 511, an idler pulley 512, a belt unit 513, and a connecting member 514. The synchronous pulley 511 and the idler pulley 512 are rotatably mounted on both sides of the base frame. The belt unit 513 is wound around and connected to the synchronous pulley 511 and the idler pulley 512. The connecting member 514 is fixed to the belt unit 513 and connected to the middle position of the synchronous drive rod 4. The drive motor 6 is driven and connected to the synchronous pulley 511. The single synchronous belt drive structure has the advantages of simple structure, low manufacturing cost, and convenient debugging. Example

[0037] like Figure 5 As shown, the sealing mechanism provided in this embodiment is basically the same as that in embodiment 1. The difference is that the pressing drive device in this embodiment adopts a double synchronous belt drive structure. The double synchronous belt drive structure is provided with two sets of synchronous belt drive components 5, drive motor 6 and synchronous drive shaft 7. The two sets of synchronous belt drive components 5 are respectively located on one side of the corresponding guide rod 3. Each synchronous belt drive component 5 includes a base frame, synchronous pulley 511, idler pulley 512, belt unit 513 and connecting member 514. The synchronous pulley 511 and idler pulley 512 are rotatably installed on both sides of the base frame. The belt unit 513 is wound around and connected to the synchronous pulley 511 and idler pulley 512. The connecting member 514 is fixed to the belt unit 513. The top of the connecting member 514 is provided with a connecting block 8. The connecting block 8 is fixed to the corresponding guide rod 3. The two ends of the synchronous drive shaft 7 are respectively fixed to the idler pulley 512 of the two sets of synchronous belt drive components 5. The drive motor 6 is driven and connected to the synchronous pulley 511 of any one of the synchronous belt drive components 5.

[0038] The synchronous drive shaft 7 achieves a dual-side drive synchronization error of ≤0.1mm. Combined with the linear bearing guide structure, it ensures the parallel movement accuracy of the dynamic pressing assembly 2 and effectively avoids the sealing wrinkles caused by single-side pressing.

[0039] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A self-adjusting pressure regulating closure mechanism, characterized by: The assembly includes a fixed pressing component (1) and a dynamic pressing component (2) that press against each other. The fixed pressing component (1) is fixedly installed. A guide rod (3) is slidably installed at each end of the fixed pressing component (1). The two guide rods (3) are parallel to each other. The front ends of the guide rods (3) are respectively connected to the corresponding sides of the dynamic pressing component (2). The two guide rods (3) are respectively connected to a pressing drive device to drive the dynamic pressing component (2) to move away from or towards the fixed pressing component (1). A heat-sealing structure is provided between the pressing surfaces of the fixed pressing component (1) and the dynamic pressing component (2). Among them, the connection between the guide rod (3) and the dynamic pressing component (2) is provided with an elastic structure. The two are elastically connected through the elastic structure. When the dynamic pressing component (2) and the fixed pressing component (1) are pressed together, the dynamic pressing component (2) has an elastic tendency toward the fixed pressing component (1).

2. A self-adjusting pressure seal mechanism according to claim 1, wherein: The elastic structure includes a connecting rod (32) and a compression spring (31). The connecting rod (32) is formed in sequence with a limiting convex cover, a smooth part (321) and a threaded part (322). A through hole (20) is opened on both sides of the dynamic pressing assembly (2). The smooth part (321) of the connecting rod (32) is movably inserted through the through hole (20), and its threaded part (322) is threaded to the guide rod (3). The end face of the guide rod (3) touches the inner side of the dynamic pressing assembly (2). The compression spring (31) is sleeved on the smooth part (321) of the connecting rod (32). One end of the compression spring (31) touches the limiting convex cover and the other end touches the outer side of the dynamic pressing assembly (2). The compression spring (31) is normally in a compressed state.

3. A self-adjusting pressure seal mechanism according to claim 2, wherein: The compression spring (31) is also connected to a limiting ring (33) at both ends, and the limiting ring (33) is sleeved on the smooth part (321) of the connecting rod (32).

4. A self-adjusting pressure seal mechanism according to claim 3, wherein: The compression spring (31) includes a rectangular spring, a disc spring, or a rubber spring.

5. A self-adjusting pressure seal mechanism according to any one of claims 1 to 4, wherein: The pressure-sealing assembly (1) includes a sealing mounting base, a heating wire assembly, and a bag-pulling adhesive strip (15). The outer side of the sealing mounting base is formed with an assembly groove (11). The heating wire assembly is embedded in the assembly groove (11). The upper part of the assembly groove (11) is also provided with a limiting groove. The bag-pulling adhesive strip (15) is snapped and fixed in the limiting groove. The dynamic pressing assembly (2) includes a rubber strip seat (21) and a pressing rubber strip (22). The guide rod (3) is elastically connected to the side of the rubber strip seat (21). The inner side of the rubber strip seat (21) is formed with a groove (210). The pressing rubber strip (22) is fitted into the groove (210). The upper part of the groove (210) is provided with a horizontally protruding tensioning edge (211). The height of the top surface of the tensioning edge (211) is not lower than the height of the bottom surface of the bag-pulling rubber strip (15). The edge of the tensioning edge (211) is formed with a chamfer or rounded corner. When the pressing rubber strip (22) is assembled, the outer side of the pressing rubber strip (22) protrudes out of the groove (210), and its protrusion height is greater than the protrusion height of the tensioning edge (211). When the dynamic pressing assembly (2) and the fixed pressing assembly (1) are pressed together, the pressing strip (22) and the heating wire assembly are heat-sealed together. At the same time, the tightening pressing edge (211) and the bag-pulling strip (15) are clamped together to tighten the bag opening.

6. A self-adjusting pressure seal mechanism according to claim 5, wherein: A bearing seat (10) is installed on each side of the sealing mounting base. The bearing seat (10) is provided with a linear bearing (101). The guide rod (3) is slidably connected to the corresponding bearing seat (10) and the linear bearing (101).

7. A self-adjusting pressure seal mechanism according to claim 6, wherein: The heating wire assembly includes, from the inside out, a heat insulation strip (12), a heating wire unit (13), and a high-temperature cloth (14). The heat insulation strip (12) is embedded in the assembly groove (11). The two ends of the heating wire unit (13) are fixedly connected to the ends of the heat insulation strip (12) and are close to the heat insulation strip (12). The high-temperature cloth (14) covers the heat insulation strip (12) and the heating wire unit (13).

8. The self-adjusting pressure seal mechanism of claim 1, wherein: The pressing drive device includes a single synchronous belt drive structure or a double synchronous belt drive structure.

9. A self-adjusting pressure seal mechanism according to claim 8, wherein: The single synchronous belt drive structure includes a set of synchronous belt drive components (5), a drive motor (6), and a synchronous drive rod (4). The two ends of the synchronous drive rod (4) are respectively fixedly connected to the guide rod (3) on the corresponding side. The synchronous belt drive components (5) are located in the middle of the synchronous drive rod (4). The synchronous belt drive assembly (5) includes a base frame, a synchronous pulley (511), an idler pulley (512), a belt unit (513), and a connector (514). The synchronous pulley (511) and the idler pulley (512) are rotatably mounted on both sides of the base frame. The belt unit (513) is wound around the synchronous pulley (511) and the idler pulley (512). The connector (514) is fixed to the belt unit (513) and connected to the middle position of the synchronous drive rod (4). The drive motor (6) is driven by the synchronous pulley (511).

10. The self-adjusting pressure seal mechanism of claim 8, wherein: The dual synchronous belt drive structure includes two sets of synchronous belt drive assemblies (5), a drive motor (6), and a synchronous drive shaft (7). The two sets of synchronous belt drive assemblies (5) are located on one side of the corresponding guide rod (3). Each synchronous belt drive assembly (5) includes a base frame, a synchronous pulley (511), an idler pulley (512), a belt unit (513), and a connector (514). The synchronous pulley (511) and the idler pulley (512) are rotatably mounted on both sides of the base frame. The belt unit (513) is wound around the synchronous pulley (511) and the idler pulley (512). The connector (514) is fixed to the belt unit (513), and a connecting block (8) is provided on the top of the connector (514). The connecting block (8) is fixed to the corresponding guide rod (3). The two ends of the synchronous drive shaft (7) are respectively fixed to the idler pulleys (512) of the two sets of synchronous belt drive assemblies (5); the drive motor (6) is connected to the synchronous pulley (511) of any one of the synchronous belt drive assemblies (5).

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