A packaging material sealing device

Abstract

The utility model relates to a kind of packaging material sealing device, it includes fixed frame, drive assembly and sealing mechanism, the drive assembly is set on the fixed frame, sealing mechanism includes two groups of oppositely arranged heating assembly, heating assembly includes connecting frame, connecting block, bearing, shaft, heating wire bundle, eccentric heating roller and torsion spring, connecting block is set at the both ends of the connecting frame, bearing is embedded in connecting block, the both ends of eccentric heating roller are connected with shaft, shaft is passed through bearing interference fit, torsion spring is sleeved on the outside of shaft, one end of torsion spring is fixed on eccentric heating roller, the other end of torsion spring is welded on the connecting block, the utility model uses the cam portion of eccentric heating roller to transfer heat by rolling contact, contact point moves constantly with rotation, the accumulation time of heat on material surface is shortened, the oblique design of cam portion makes contact pressure gradually increase from edge to center, avoid local pressure concentration to cause material overheating deformation.

Description

Technical Field

[0001] This utility model relates to the field of sealing devices, and in particular to a sealing device for packaging materials. Background Technology

[0002] In the field of packaging machinery, automatic sealing technology is a key step in achieving the sealing of packaging materials. Among existing automatic sealing devices, the flat heating block is the most commonly used structural form, which achieves material sealing by directly pressing two heating plates together. However, this structure has significant drawbacks when handling thin packaging materials.

[0003] The contact between the flat heating block and the material is surface contact, and it remains stationary during the pressing process. Heat tends to accumulate continuously in the contact area. For thin materials, the heat resistance is poor, and quality problems such as scorching and perforation are easily caused by the local temperature exceeding the material's melting threshold. Furthermore, the traditional flat structure relies on the overall driving force to achieve pressing. When there are slight wrinkles or thickness deviations in the material, the flat plate cannot adaptively adjust the contact pressure. This can easily lead to excessive local pressure causing material stretching and deformation, or insufficient pressure causing poor sealing, which seriously affects the stability of the sealing quality. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a sealing device for packaging materials.

[0005] The packaging material sealing device provided by this utility model adopts the following technical solution:

[0006] A packaging material sealing device includes a fixed frame, a drive assembly, and a sealing mechanism. The drive assembly is mounted on the fixed frame. The sealing mechanism includes two sets of oppositely arranged heating components, one set of which is mounted on the fixed frame. The drive assembly drives the other set of heating components to move horizontally. Each heating component includes a connecting frame, a connecting block, a bearing, a rotating shaft, a heating wire harness, an eccentric heating roller, and a torsion spring. The connecting block is located at both ends of the connecting frame. The bearing is embedded in the connecting block. Both ends of the eccentric heating roller are connected to the rotating shaft, which is interference-fitted with the bearing. The torsion spring is sleeved on the outside of the rotating shaft, with one end fixed to the eccentric heating roller and the other end welded to the connecting block.

[0007] Optionally, the eccentric heating roller includes a circumferential portion and a cam portion, the rotating shaft is coaxial with the circumferential portion, the cam portion is inclined downward, and the cam portions on the two sets of eccentric heating rollers are arranged opposite each other.

[0008] Optionally, the surface of the cam portion is provided with a plurality of protrusions arranged axially along the circumference, and the positions of the protrusions on the two sets of eccentric heating rollers are staggered.

[0009] Optionally, the rotating shaft is hollow, and a wire harness channel is provided inside the eccentric heating roller. The rotating shaft is connected to the wire harness channel of the eccentric heating roller. One end of the rotating shaft passes through the bearing, and a crimp terminal is provided at the end of the rotating shaft that passes through the bearing. The heating wire harness passes through the crimp terminal and enters the wire harness channel inside the eccentric heating roller. The heating wire harness heats the eccentric heating roller by connecting to an external power supply and a switch.

[0010] Optionally, the drive assembly includes a fixed plate, a cylinder, a connecting plate, a slide rod, a sliding sleeve, and a push plate. The fixed plate is fixed to the fixed frame, and through holes are provided on both sides of the fixed plate. The sliding sleeve is disposed at the through holes of the fixed plate. The cylinder is disposed on the side of the fixed plate away from the fixed frame. The output end of the cylinder is connected to the connecting plate. The two ends of the connecting plate are connected to the slide rod. The slide rod passes through the sliding sleeve and slides in cooperation with the sliding sleeve. The end of the slide rod is connected to the push plate. The connecting frame is connected to the push plate.

[0011] Optionally, a shock-absorbing assembly is provided between the push plate and the connecting frame. The shock-absorbing assembly includes several springs, pins, and limiting plates. One end of the pin is fixed to the connecting frame, and the other end passes through the push plate. The pin passes through one side of the connecting frame and connects to the limiting plate. The pin slides with the push plate. The spring is sleeved on the outside of the pin, and the two ends of the spring abut against the push plate and the connecting frame, respectively.

[0012] In summary, this utility model has at least one of the following beneficial technical effects:

[0013] 1. Compared with flat heating blocks, which are prone to scorching of thin materials due to surface contact and stationary operation, this utility model uses the cam part of the eccentric heating roller to transfer heat through rolling contact. The contact point moves continuously with rotation, shortening the heat accumulation time on the material surface. At the same time, the inclined design of the cam part makes the contact pressure gradually increase from the edge to the center, avoiding material overheating and deformation caused by local pressure concentration.

[0014] 2. Several protrusions arranged axially on the surface of the cam are staggered. When the roller rotates to the point where the protrusions contact the material, the staggered protrusion structure forms a shearing force. Combined with the softened state of the material after heat sealing, the packaging material is cut. After heat sealing and cutting are completed, the drive assembly drives the movable side heating assembly to reset. The two sets of rollers separate, and the torsion spring sleeved on the rotating shaft generates a reset torque due to the previous rotational deformation, which drives the eccentric heating roller back to the initial angle.

[0015] 3. The combined design of the drive component and the damping component achieves dynamic buffering while ensuring motion accuracy. The spring of the damping component forms an elastic buffer layer between the push plate and the connecting frame. When the two sets of eccentric heating rollers come into contact with the material, the spring compression absorbs the impact load of the cylinder, preventing the thin material from wrinkling or breaking due to instantaneous high pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a sealing device for packaging materials.

[0017] Figure 2 This is a top view of a sealing device for packaging materials.

[0018] Figure 3 This is a schematic diagram showing the positional relationship between the connecting block and the eccentric heating roller.

[0019] Figure 4 yes Figure 1 Enlarged view of part A in the middle.

[0020] Explanation of reference numerals in the attached drawings: 1. Fixing frame; 2. Drive assembly; 21. Fixing plate; 22. Cylinder; 23. Connecting plate; 24. Slide rod; 25. Slide sleeve; 26. Push plate; 3. Heating assembly; 31. Connecting frame; 32. Connecting block; 33. Bearing; 34. Rotating shaft; 35. Heating wire harness; 36. Eccentric heating roller; 361. Circumferential part; 362. Cam part; 363. Protrusion; 37. Torsion spring; 4. Shock absorption assembly; 41. Spring; 42. Pin; 43. Limiting plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] This utility model discloses a sealing device for packaging materials. (Refer to...) Figure 1-4 A packaging material sealing device includes a fixed frame 1, a drive assembly 2, and a sealing mechanism. The drive assembly 2 is mounted on the fixed frame 1. The sealing mechanism includes two sets of heating components 3 arranged opposite each other. One set of heating components 3 is mounted on the fixed frame 1. The drive assembly 2 drives the other set of heating components 3 to move horizontally. The heating component 3 includes a connecting frame 31, a connecting block 32, a bearing 33, a rotating shaft 34, a heating wire harness 35, an eccentric heating roller 36, and a torsion spring 37. The connecting block 32 is mounted at both ends of the connecting frame 31. The bearing 33 is embedded in the connecting block 32. The two ends of the eccentric heating roller 36 are connected to the rotating shaft 34. The rotating shaft 34 is press-fitted with the bearing 33. The torsion spring 37 is sleeved on the outside of the rotating shaft 34. One end of the torsion spring 37 is fixed to the eccentric heating roller 36, and the other end of the torsion spring 37 is welded to the connecting block 32.

[0025] Through the above design, the drive component 2 drives a set of heating components 3 to move horizontally, so that the two sets of eccentric heating rollers 36 arranged opposite each other gradually approach each other from the initial separation state. Since the eccentric heating roller 36 includes a coaxial circumferential part 361 and a downwardly inclined cam part 362, when the two sets of rollers approach each other, the inclined cam part 362 will first contact the packaging material in a line contact manner, rather than the traditional surface contact. As the drive component 2 continues to apply pressure, the cam part 362 rotates due to the force, and at the same time drives the circumferential part 361 to rotate synchronously, forming a rolling pressing trajectory.

[0026] Compared to flat heating blocks, which are prone to scorching of thin materials due to surface contact and stationary operation, this invention uses the cam portion 362 of the eccentric heating roller 36 to transfer heat through rolling contact. The contact point moves continuously with rotation, shortening the heat accumulation time on the material surface. At the same time, the inclined design of the cam portion 362 causes the contact pressure to gradually increase from the edge to the center, avoiding overheating and deformation of the material caused by local pressure concentration.

[0027] The eccentric heating roller 36 includes a circumferential portion 361 and a cam portion 362. The rotating shaft 34 is coaxial with the circumferential portion 361. The cam portion 362 is inclined downward. The cam portions 362 on the two sets of eccentric heating rollers 36 are arranged opposite each other. The surface of the cam portion 362 is provided with a number of protrusions 363 arranged along the axial direction of the circumferential portion 361. The positions of the protrusions 363 on the two sets of eccentric heating rollers 36 are staggered. Through this design, the number of protrusions 363 arranged along the axial direction on the surface of the cam portion 362 are staggered. When the roller rotates to the point where the protrusions 363 contact the material, the staggered protrusion structure 363 forms a shearing force. Combined with the softened state of the material after heat sealing, the packaging material is cut. After heat sealing and cutting are completed, the drive component 2 drives the movable side heating component 3 to reset. The two sets of rollers separate. The torsion spring 37 sleeved on the rotating shaft 34 generates a reset torque due to the previous rotational deformation, which drives the eccentric heating roller 36 back to the initial angle.

[0028] The drive assembly 2 includes a fixed plate 21, a cylinder 22, a connecting plate 23, a slide rod 24, a sliding sleeve 25, and a push plate 26. The fixed plate 21 is fixedly connected to the fixed frame 1. Through holes are provided on both sides of the fixed plate 21. The sliding sleeve 25 is located at the through holes of the fixed plate 21. The cylinder 22 is located on the side of the fixed plate 21 away from the fixed frame 1. The output end of the cylinder 22 is connected to the connecting plate 23. The two ends of the connecting plate 23 are connected to the slide rod 24. The slide rod 24 passes through the sliding sleeve 25 and slides in cooperation with the sliding sleeve 25. The end of the slide rod 24 is connected to the push plate 26. The connecting frame 31 is connected to the push plate 26. A damping assembly 4 is provided between the push plate 26 and the connecting frame 31. The damping assembly 4 includes several springs 41 and pins 42. The limiting plate 43 and the pin 42 are fixed at one end to the connecting frame 31 and the other end passes through the push plate 26. The pin 42 passes through one side of the connecting frame 31 and connects to the limiting plate 43. The pin 42 and the push plate 26 are slidably engaged. The spring 41 is sleeved on the outside of the pin 42. The two ends of the spring 41 abut against the push plate 26 and the connecting frame 31 respectively. The combined design of the drive component 2 and the damping component 4 achieves dynamic buffering while ensuring motion accuracy. The spring 41 of the damping component 4 forms an elastic buffer layer between the push plate 26 and the connecting frame 31. When the two sets of eccentric heating rollers 36 contact the material, the spring 41 is compressed to absorb the impact load of the cylinder 22, avoiding wrinkles or damage to the thin material due to instantaneous high pressure.

[0029] The rotating shaft 34 is hollow, and the eccentric heating roller 36 has a wire harness channel inside. The rotating shaft 34 is connected to the wire harness channel of the eccentric heating roller 36. One end of the rotating shaft 34 passes through the bearing 33, and the end of the rotating shaft 34 passing through the bearing 33 is provided with a crimp terminal. The heating wire harness 35 passes through the crimp terminal and enters the wire harness channel inside the eccentric heating roller 36. The heating wire harness 35 heats the eccentric heating roller 36 by connecting to an external power supply and a switch. The heating of the eccentric heating roller 36 by the external power supply adopts the conventional electric heating method in the art. Its core principle is to convert electrical energy into heat energy through the heating wire harness 35 and transfer it to the roller body. This process is within the scope of existing technology.

[0030] Specifically, an external power supply is connected to the control switch of the device via a power supply line. After being regulated by the switch, the current is introduced into the hollow rotating shaft 34 through the crimp terminal at the end of the rotating shaft 34. Then, a closed loop is formed by the heating wire harness 35 passing through the wire harness channel of the rotating shaft 34 and the eccentric heating roller 36. The resistive element (such as a nickel-chromium alloy heating wire) in the heating wire harness 35 generates Joule heat under the action of the current. The heat is gradually transferred to the working surface of the eccentric heating roller 36 through the insulating thermally conductive structure of the outer layer of the wire harness (such as a quartz sleeve) and the thermal conductivity of the roller body metal material itself, so as to meet the temperature conditions required for heat sealing of the packaging material.

[0031] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sealing device for packaging materials, characterized in that: The device includes a fixed frame (1), a drive assembly (2), and a sealing mechanism. The drive assembly (2) is mounted on the fixed frame (1). The sealing mechanism includes two sets of heating assemblies (3) arranged opposite each other. One set of heating assemblies (3) is mounted on the fixed frame (1). The drive assembly (2) drives the other set of heating assemblies (3) to move horizontally. The heating assembly (3) includes a connecting frame (31), a connecting block (32), a bearing (33), a rotating shaft (34), a heating wire harness (35), and an eccentric heating roller (36). The connecting block (32) is disposed at both ends of the connecting frame (31), and the bearing (33) is embedded in the connecting block (32). The two ends of the eccentric heating roller (36) are connected to the rotating shaft (34). The rotating shaft (34) is interference-fitted by the bearing (33). The torsion spring (37) is sleeved on the outside of the rotating shaft (34). One end of the torsion spring (37) is fixed on the eccentric heating roller (36), and the other end of the torsion spring (37) is welded to the connecting block (32).

2. The packaging material sealing device according to claim 1, characterized in that: The eccentric heating roller (36) includes a circumferential portion (361) and a cam portion (362). The rotating shaft (34) is coaxial with the circumferential portion (361). The cam portion (362) is inclined downward. The cam portions (362) on the two sets of eccentric heating rollers (36) are arranged opposite to each other.

3. A packaging material sealing device according to claim 2, characterized in that: The surface of the cam portion (362) is provided with a plurality of protrusions (363) arranged axially along the circumference portion (361), and the positions of the protrusions (363) on the two sets of eccentric heating rollers (36) are staggered.

4. A packaging material sealing device according to claim 1, characterized in that: The rotating shaft (34) is hollow, and the eccentric heating roller (36) has a wire harness channel inside. The rotating shaft (34) is connected to the wire harness channel of the eccentric heating roller (36). One end of the rotating shaft (34) passes through the bearing (33). The end of the rotating shaft (34) that passes through the bearing (33) is provided with a crimp terminal. The heating wire harness (35) passes through the crimp terminal and enters the wire harness channel inside the eccentric heating roller (36). The heating wire harness (35) heats the eccentric heating roller (36) by connecting to an external power supply and a switch.

5. A packaging material sealing device according to claim 1, characterized in that: The drive assembly (2) includes a fixed plate (21), a cylinder (22), a connecting plate (23), a slide rod (24), a sliding sleeve (25), and a push plate (26). The fixed plate (21) is fixed to the fixed frame (1). The fixed plate (21) has through holes on both sides. The sliding sleeve (25) is located at the through holes of the fixed plate (21). The cylinder (22) is located on the side of the fixed plate (21) away from the fixed frame (1). The output end of the cylinder (22) is connected to the connecting plate (23). The two ends of the connecting plate (23) are connected to the slide rod (24). The slide rod (24) passes through the sliding sleeve (25) and slides with the sliding sleeve (25). The end of the slide rod (24) is connected to the push plate (26). The connecting frame (31) is connected to the push plate (26).

6. A packaging material sealing device according to claim 5, characterized in that: A shock-absorbing component (4) is provided between the push plate (26) and the connecting frame (31). The shock-absorbing component (4) includes several springs (41), pins (42), and limiting plates (43). One end of the pin (42) is fixed on the connecting frame (31), and the other end passes through the push plate (26). The pin (42) passes through one side of the connecting frame (31) and connects to the limiting plate (43). The pin (42) slides with the push plate (26). The springs (41) are sleeved on the outside of the pins (42), and the two ends of the springs (41) abut against the push plate (26) and the connecting frame (31) respectively.

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