Heating wire sealing mechanism

Abstract

The utility model discloses a kind of heating wire sealing mechanism, it includes heating wire, bottom plate, pad seat, linear drive device, turnover mechanism, swing arm, upper pressing strip, lower pressing strip, fixed assembly and elastic tensioning assembly, the lower pressing strip is set on the bottom plate, the heating wire is located the upper surface of the lower pressing strip, the fixed assembly and elastic tensioning assembly are located the both ends position of the lower pressing strip, and the heating wire is pulled tight, the upper pressing strip is set on the swing arm.The utility model structure design is reasonable, when working, linear drive device extends, push turnover mechanism to make swing arm turn down to vertical position, upper pressing strip is parallel to the lower pressing strip, and the opening is sealed by heating wire heat.In sealing process, heating wire two ends are respectively by fixed assembly and elastic tensioning assembly continuous axial tension, maintain heating wire tension, compensate the length change of thermal expansion and cold shrink, ensure that sealing pressure is uniform, sealing line is always straight, and sealing effect is good.

Description

Technical Field

[0001] This utility model relates to the field of sealing machine technology, specifically to a heating wire sealing mechanism used in sealing machines. Background Technology

[0002] In the field of packaging machinery, especially in sealing equipment for thermoplastic materials such as plastic bags and films, thermo-press sealing using heating wires (or electric heating wires) is a widely used technology. Its basic principle is to instantaneously heat the heating wire to its melting temperature, place it between or above the material layers to be sealed, apply pressure to melt and bond it, and then form a sealing line after cooling.

[0003] The common method for fixing heating wires is to directly press both ends of the heating wire to a metal base or a pressure strip using screws. However, the heating wire undergoes drastic temperature changes during operation, rising from room temperature to hundreds of degrees Celsius and then cooling down. This repeated thermal expansion and contraction causes the initially taut heating wire to gradually loosen, affecting the uniformity of the sealing pressure. This results in a crooked sealing line, an unsightly seal, and in severe cases, a weak seal. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a heating wire sealing mechanism with a reasonable structural design and good sealing effect.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A heating wire sealing mechanism includes a heating wire, a base plate, a raised seat, a linear drive device, a flipping mechanism, a swing arm, an upper pressure strip, a lower pressure strip, a fixing component, and an elastic tensioning component. The lower pressure strip is disposed on the base plate, and the heating wire is located on the upper surface of the lower pressure strip. The fixing component and the elastic tensioning component are located at both ends of the lower pressure strip and tighten the heating wire. The upper pressure strip is disposed on the swing arm. The linear drive device is disposed to the side of the lower pressure strip via the raised seat and can drive the swing arm to flip upwards parallel to the base plate or downwards perpendicular to the base plate via the flipping mechanism, so that the upper pressure strip and the lower pressure strip are close together and engaged.

[0007] As a preferred embodiment of this utility model, the flipping mechanism includes side plates, a rotating shaft, and a gear flipping plate. The tail ends of the two side plates are fixed to both sides of the linear drive device. The rotating shaft is located at the front of the side plates. The gear flipping plate includes a gear part and a flat plate part. The flat plate part is horizontally fixed to the outer circumferential surface of the gear part. A bearing or bushing adapted to the rotating shaft is provided at the center of the gear part. The drive shaft of the linear drive device extends to the lower position of the gear part and is provided with teeth that mesh with the gear part. The rotation of the gear drives the flat plate part to flip precisely.

[0008] As a preferred embodiment of this utility model, the flipping mechanism includes side plates, a rotating shaft, a linkage shaft, and a rotating wheel flipping plate. The tail ends of the two side plates are fixed to both sides of the linear drive device. The rotating shaft is disposed at the front of the side plates. The rotating wheel flipping plate includes a circular wheel portion and a flat plate portion. The flat plate portion is horizontally fixed to the outer circumferential surface of the circular wheel portion. A bearing or bushing adapted to the rotating shaft is provided at the center of the circular wheel portion. An eccentric shaft is provided at the eccentric position of the circular wheel portion. One end of the linkage shaft is hinged to the drive shaft of the linear drive device, and the other end of the linkage shaft is rotatably disposed on the eccentric shaft. The circular wheel rotates around the rotating shaft, causing the flat plate portion to flip.

[0009] In a preferred embodiment of this utility model, the fixing component includes an inclined seat, a fixing pressure seat, and a first handle screw. The fixing pressure seat has a first through hole that passes horizontally through it, and a first screw hole corresponding to the first through hole is provided on the fixing pressure seat. The first screw hole is perpendicular to and communicates with the first through hole. The fixing pressure seat is fixed to the inclined surface of the inclined seat by the screw, with the first through hole facing the downward pressure bar. The heating wire passes through the first through hole, and the first handle screw is screwed into the first screw hole and presses against the heating wire. Operation is simple and convenient.

[0010] In a preferred embodiment of this invention, the inclined seat is provided with a first cover that encloses the fixed pressure seat. This prevents the operator from accidentally touching the high-temperature area and improves safety.

[0011] As a preferred embodiment of this utility model, the elastic tensioning assembly includes a frame, a slide rod, a slider, a spring, a movable pressure seat, and a second handle screw. The slide rod is disposed inside the frame, the slider is movably disposed on the slide rod, and the movable pressure seat is fixed on the slider. The movable pressure seat has a second through hole that passes horizontally through it, and a second screw hole is provided on the movable pressure seat corresponding to the position of the second through hole. The second screw hole is perpendicular to and communicates with the second through hole. The heating wire passes through the second through hole, and the second handle screw is screwed into the second screw hole and can press against the heating wire. The spring is sleeved on the slide rod and can push the slider to move away from the lower pressure bar and tighten the heating wire, maintaining the tension of the heating wire.

[0012] In a preferred embodiment of this invention, the slider is provided with a second cover that encloses the movable pressure seat. This isolates heat, prevents foreign objects from entering the frame, extends the life of the slider, and prevents the slider from jamming.

[0013] In a preferred embodiment of this invention, both the upper and lower pressure strips are high-temperature resistant silicone strips. These high-temperature resistant silicone strips possess a certain degree of flexibility, allowing them to adapt to differences in bag opening thickness, eliminate indentations, and result in a more aesthetically pleasing seal.

[0014] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonably designed. During operation, the linear drive device extends and pushes the flipping mechanism to flip the swing arm to a vertical position. The upper pressure bar presses parallel to the lower pressure bar, and the opening is heat-sealed through the heating wire. During the sealing process, the two ends of the heating wire are continuously subjected to axial tension by a fixing component and an elastic tensioning component, maintaining the tension of the heating wire, compensating for the length changes due to thermal expansion and contraction, ensuring uniform sealing pressure, a straight sealing line, and a good sealing effect.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is an exploded structural diagram of the flipping mechanism in this utility model.

[0018] Figure 3 This is a structural schematic diagram of the fixing component in this utility model.

[0019] Figure 4 This is a schematic diagram of the elastic tensioning component in this utility model.

[0020] Figure 5 This is a schematic diagram of the working structure of this utility model. Detailed Implementation

[0021] See the example. Figures 1 to 5 This embodiment provides a heating wire sealing mechanism, which includes a heating wire 1, a base plate 2, a raised seat 3, a linear drive device 4, a flipping mechanism 5, a fixing component 6, an elastic tensioning component 7, an upper pressure bar 8, a lower pressure bar 9, and a swing arm 10. In this embodiment, the linear drive device 4 is preferably a cylinder; in other embodiments, the linear drive device 4 can also be a hydraulic cylinder or a linear motor.

[0022] Both the upper pressure strip 8 and the lower pressure strip 9 are preferably high-temperature resistant silicone strips, with a long-term operating temperature of around 250℃ and an instantaneous peak temperature of up to 300℃. The heating wire 1 operates at a temperature of 150~220℃, which is within the safe operating range of the high-temperature resistant silicone strip. Moreover, the high-temperature resistant silicone strip has a certain degree of flexibility, which can adapt to differences in bag opening thickness, eliminate indentations, and make the seal more aesthetically pleasing.

[0023] The lower pressure strip 9 is disposed on the base plate 2. Specifically, a pressure strip lower seat 21 is fixed on the base plate 2 by screws. The upper surface of the pressure strip lower seat 21 is provided with an assembly positioning groove that is adapted to the lower pressure strip 9. The lower pressure strip 9 is positioned and fixed on the assembly positioning groove.

[0024] The heating wire 1 is located in the middle of the upper surface of the lower pressure bar 9, and the upper corners of both ends of the lower pressure bar 9 are provided with arc surfaces.

[0025] The fixing component 6 and the elastic tensioning component 7 are located at both ends of the lower pressure strip 9 and tighten the heating wire 1. During the sealing process, the fixing component 6 and the elastic tensioning component 7 continuously apply axial tension to both ends of the heating wire 1 to maintain the tension of the heating wire 1, compensate for the length changes due to thermal expansion and contraction, ensure uniform sealing pressure, keep the sealing line straight, and achieve a good sealing effect. For details, see [link to documentation]. Figure 3 ,

[0026] The fixing component 6 includes a slant seat 61, a fixing base 62, and a first handle screw 63. The fixing base 62 has a first through hole 621 that passes horizontally through it. A first screw hole 622 is provided on the fixing base 62 corresponding to the first through hole 621. The first screw hole 622 is perpendicular to and communicates with the first through hole 621. The fixing base 62 is fixed to the inclined surface of the slant seat 61 by screws, with the first through hole 621 facing the downward pressure bar. The heating wire passes through the first through hole 621. The first handle screw 63 is screwed into the first screw hole 622 and presses against the heating wire, making operation simple and convenient. Preferably, the slant seat 61 has a first cover 64 that covers the fixing base 62. The first cover 64 prevents the operator from accidentally touching the high-temperature area, improving safety.

[0027] See Figure 4 The elastic tensioning assembly 7 includes a frame 71, a slide rod 72, a slider 73, a spring 74, a movable pressure seat 75, and a second handle screw 76. The slide rod 72 is disposed inside the frame 71, the slider 73 is movably disposed on the slide rod 72, and the movable pressure seat 75 is fixed on the slider 73. The movable pressure seat 75 has a second through hole 751 that passes horizontally through it, and a second screw hole 752 corresponding to the second through hole 751. The second screw hole 752 is perpendicular to and communicates with the second through hole 751. The heating wire 1 passes through the second through hole 751, and the second handle screw 76 is screwed into the second screw hole 752 and presses against the heating wire 1. The spring 74 is sleeved on the slide rod 72 and can push the slider 73 to move away from the lower pressure bar 9 and tighten the heating wire 1, maintaining the tension of the heating wire 1. Preferably, the slider 73 has a second cover 77 that covers the movable pressure seat 75. The second cover 77 can isolate heat and prevent foreign objects from entering the frame 71, extend the life of the slide bar 72, and prevent the slider 73 from getting stuck.

[0028] The upper pressure strip 8 is disposed on the swing arm 10. Specifically, the swing arm 10 is T-shaped in general. The upper and lower surfaces of the horizontal part of the swing arm 10 are provided with clamping plates. One side of the plate is fixed to the horizontal part by screws, and the other end is bent to form a claw. The upper pressure strip 8 is located between the two clamping plates and is provided with a claw groove that matches the claw. The claw is positioned and fixed by engaging the claw groove.

[0029] The linear drive device 4 is positioned to the side of the lower pressure bar 9 via the elevation seat 3, and can drive the swing arm 10 to flip upwards parallel to the base plate 2 or downwards perpendicular to the base plate 2 via the flipping mechanism 5, so that the upper pressure bar 8 and the lower pressure bar 9 come close together. For details, see [link to details]. Figure 2 The flipping mechanism 5 includes side plates 51, a rotating shaft 52, and a gear flipping plate 53. The tail ends of the two side plates 51 are fixed to both sides of the linear drive device 4. The rotating shaft 52 is located at the front of the side plates 51. The gear flipping plate 53 includes a gear part 531 and a flat plate part 532. The flat plate part 532 is horizontally fixed to the outer circumferential surface of the gear part 531. A bearing or bushing adapted to the rotating shaft 52 is provided at the center of the gear part 531. The drive shaft of the linear drive device 4 extends to the lower position of the gear part 531 and is provided with teeth that mesh with the gear part 531. The rotation of the gear drives the flat plate part 532 to flip precisely. In other embodiments, an eccentric wheel drive structure can also be used, that is, the flipping mechanism 5 includes a side plate, a rotating shaft, a linkage shaft, and a rotating wheel flipping plate. The tail ends of the two side plates are fixed to the two sides of the linear drive device 4. The rotating shaft is arranged at the front of the side plate. The rotating wheel flipping plate includes a round wheel part and a flat plate part. The flat plate part is horizontally fixed to the outer circumferential surface of the round wheel part. The center position of the round wheel part is provided with a bearing or bushing adapted to the rotating shaft. The eccentric position of the round wheel part is provided with an eccentric shaft. One end of the linkage shaft is hinged to the drive shaft of the linear drive device 4, and the other end of the linkage shaft is rotatably arranged on the eccentric shaft. The round wheel rotates around the rotating shaft to drive the flat plate part to flip.

[0030] During operation, in the initial state, see [reference needed]. Figure 1 The drive shaft of the linear drive device 4 is extended, causing the gear flap to flip upward so that the swing arm 10 is in a horizontal state, that is, the swing arm 10 is parallel to the base plate 2. Preferably, a first height adjustment screw 54 is provided on the top surface of the side plate. When the swing arm 10 is parallel to the base plate 2, the first height adjustment screw 54 is exactly abutting against the swing arm 10 to prevent the swing arm 10 from rotating excessively.

[0031] When sealing is required, see Figure 5The drive shaft of the linear drive device 4 retracts, causing the gear flap to flip downwards, making the swing arm 10 perpendicular to the base plate 2. Preferably, a second height adjustment screw 55 is provided on the front side of the side plate. When the swing arm 10 is perpendicular to the base plate 2, the second height adjustment screw 55 is precisely abutting against the swing arm 10, preventing the swing arm 10 from rotating excessively and ensuring the rotation angle. When the upper pressure strip 8 and the lower pressure strip 9 are close together, the heating wire 1 is energized and heats up, achieving the purpose of heat sealing the opening.

[0032] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. Any mechanism that is the same as or similar to that used is within the protection scope of this utility model.

Claims

1. A heating wire sealing mechanism, comprising a heating wire, characterized in that, It includes a base plate, a raised seat, a linear drive device, a flipping mechanism, a swing arm, an upper pressure bar, a lower pressure bar, a fixing component, and an elastic tensioning component. The lower pressure bar is disposed on the base plate, and the heating wire is located on the upper surface of the lower pressure bar. The fixing component and the elastic tensioning component are located at both ends of the lower pressure bar and tighten the heating wire. The upper pressure bar is disposed on the swing arm. The linear drive device is disposed to the side of the lower pressure bar through the raised seat and can drive the swing arm to flip upward to be parallel to the base plate or downward to be perpendicular to the base plate through the flipping mechanism, so that the upper pressure bar and the lower pressure bar are close together and cooperate.

2. The heating wire sealing mechanism according to claim 1, characterized in that: The flipping mechanism includes side plates, a rotating shaft, and a gear flip plate. The tail ends of the two side plates are fixed to both sides of the linear drive device. The rotating shaft is located at the front of the side plates. The gear flip plate includes a gear part and a flat plate part. The flat plate part is horizontally fixed to the outer circumferential surface of the gear part. The center of the gear part is provided with a bearing or bushing that is adapted to the rotating shaft. The drive shaft of the linear drive device extends to the lower position of the gear part and is provided with teeth that mesh with the gear part.

3. The heating wire sealing mechanism according to claim 1, characterized in that: The flipping mechanism includes side plates, a rotating shaft, a linkage shaft, and a rotating wheel flip plate. The tail ends of the two side plates are fixed to both sides of the linear drive device. The rotating shaft is located at the front of the side plates. The rotating wheel flip plate includes a circular wheel part and a flat plate part. The flat plate part is horizontally fixed to the outer circumferential surface of the circular wheel part. A bearing or bushing adapted to the rotating shaft is provided at the center of the circular wheel part. An eccentric shaft is provided at the eccentric position of the circular wheel part. One end of the linkage shaft is hinged to the drive shaft of the linear drive device, and the other end of the linkage shaft is rotatably mounted on the eccentric shaft.

4. The heating wire sealing mechanism according to claim 1, characterized in that: The fixing assembly includes an inclined seat, a fixing pressure seat, and a first handle screw. The fixing pressure seat has a first through hole that passes through it horizontally. The fixing pressure seat has a first screw hole corresponding to the position of the first through hole. The first screw hole is perpendicular to and communicates with the first through hole. The fixing pressure seat is fixed to the inclined surface of the inclined seat by screws, such that the first through hole faces the downward pressure bar. The heating wire passes through the first through hole. The first handle screw is screwed into the first screw hole and can press against the heating wire.

5. The heating wire sealing mechanism according to claim 4, characterized in that: The inclined seat is provided with a first cover that covers the fixed pressure seat.

6. The heating wire sealing mechanism according to claim 1, characterized in that: The elastic tensioning assembly includes a frame, a slide rod, a slider, a spring, a movable pressure seat, and a second handle screw. The slide rod is disposed inside the frame, the slider is movably disposed on the slide rod, and the movable pressure seat is fixed on the slider. The movable pressure seat has a second through hole that passes horizontally through it, and a second screw hole is provided on the movable pressure seat corresponding to the position of the second through hole. The second screw hole is perpendicular to and communicates with the second through hole. The heating wire passes through the second through hole, and the second handle screw is screwed into the second screw hole and presses against the heating wire. The spring is sleeved on the slide rod and can push the slider to move away from the lower pressure bar and tighten the heating wire.

7. The heating wire sealing mechanism according to claim 6, characterized in that: The slider is provided with a second cover that covers the movable pressure seat.

8. The heating wire sealing mechanism according to any one of claims 1-7, characterized in that: Both the upper and lower pressure strips are high-temperature resistant silicone strips.

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