A plastic film material welding machine heating structure

Abstract

This utility model relates to a heating structure for a plastic film welding machine, including a frame and an upper pressure roller and a lower pressure roller mounted on the frame for pressing plastic film. A hot wedge for heating the plastic film is provided between the upper and lower pressure rollers. The key feature is that the upper and lower parts of the hot wedge are respectively provided with pressing wheel mechanisms for adhering the plastic film to the hot wedge. The pressing wheel mechanism includes a bracket, a fixed shaft fixed in the middle of the bracket, and a rotatable wheel frame sleeved on the fixed shaft. Rotatable pressing wheels are located at both ends of the fixed shaft. This utility model, through the swing design of the pressing wheel around the fixed shaft, ensures that the pressing wheel rotates around the central axis during film transport, and can completely adhere to the surface of the hot wedge during operation.

Description

Technical Field

[0001] This utility model relates to a heating structure for a plastic film welding machine. Background Technology

[0002] Plastic film welding machines work by passing adjacent film edges through a heating element during plastic film installation, and then using cooperating pressure rollers to press the heated plastic films together. The welding machine typically moves forward simultaneously with the heating process. The heating element is located in the middle of the two pressure rollers. Existing plastic film welding machines use single auxiliary pressure rollers on the upper and lower surfaces of the heating element to ensure contact between the film and the heating element during film transport. However, a single auxiliary pressure roller cannot guarantee a continuous and tight fit between the film and the heating element, resulting in insufficient heating time and area, thus compromising the quality of the weld seal. Utility Model Content

[0003] To address the issue that existing plastic film welding machines cannot tightly adhere the film to the heating element during transport, resulting in insufficient heating time and range, and thus failing to guarantee welding seal quality.

[0004] The technical solution of this utility model is as follows: A heating structure for a plastic film welding machine includes a frame and an upper pressure roller and a lower pressure roller mounted on the frame for pressing plastic film. A hot wedge for heating the plastic film is provided between the upper pressure roller and the lower pressure roller. The hot wedge is characterized in that a pressing wheel mechanism for making the plastic film adhere to the hot wedge is respectively provided on the upper and lower parts of the hot wedge. The pressing wheel mechanism includes a bracket, a fixed shaft is fixed in the middle of the bracket, a rotatable wheel frame is sleeved on the fixed shaft, and rotatable pressing wheels are located at both ends of the fixed shaft.

[0005] Preferably, the frame is provided with an upper pressure roller frame, the upper pressure roller is hinged to the front side of the upper pressure roller frame, and the lower part of the upper pressure roller frame is fixed with an obliquely extending connecting plate. The fixed shaft of the upper pressing roller mechanism of the hot wedge is fixedly connected to the connecting plate.

[0006] Preferably, the lower part of the frame has a base, and the base is provided with wheels on both sides. The pressing wheel mechanism at the lower part of the hot wedge is fixedly connected to the base.

[0007] Preferably, the hot-cutting blade gradually shrinks from the input end to the output end of the plastic film material, and the upper and lower surfaces of the hot-cutting blade are arc-shaped.

[0008] Preferably, the hot wedge includes a housing, an upper heating block and a lower heating block are disposed inside the housing, and an electric heating rod horizontally disposed along the film conveying direction is sandwiched between the upper heating block and the lower heating block.

[0009] Preferably, the lower surface of the lower heating block and the lower surface of the upper heating block have grooves for embedding electric heating rods, and the front end of the upper heating block extends downward to form a slot for embedding the lower heating block. The slot also has a positioning groove for limiting the electric heating rod.

[0010] Preferably, the lower heating block is connected to the upper heating block and the outer casing by bolts.

[0011] Preferably, a lighting lamp is fixed on the top of the frame.

[0012] Preferably, the upper pressure roller and the lower pressure roller are driven by a motor to rotate in opposite directions.

[0013] Preferably, the pressing wheels on the wheel frame are arranged symmetrically about a fixed axis.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model, through the swing design of the pressing wheel around the fixed axis, can ensure that the pressing wheel rotates around the central axis during the film conveying process and can completely fit the surface of the hot wedge during operation.

[0015] (2) The heating tubes are arranged horizontally along the direction of travel, which can provide more uniform heating for the hot wedge.

[0016] (3) The hot wedge is composed of multiple parts and can quickly disassemble the hot wedge module for the repair and replacement of the electric heating tube.

[0017] (4) In this embodiment of the utility model, the use of a lighting lamp makes it convenient to observe the adhesion of the film at night or in areas with poor light. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the upper pressing wheel mechanism in an embodiment of the present invention; Figure 3 This is a schematic diagram of the back-side pressing wheel mechanism in an embodiment of this utility model; Figure 4 This is an exploded structural diagram of the hot wedge tool according to an embodiment of the present invention; In the diagram: 100-Frame; 101-Upper pressure roller; 102-Lower pressure roller; 20-Hot wedge; 210-Outer shell; 220-Upper heating block; 230-Lower heating block; 240-Electric heating rod; 250-Groove; 221-Slot; 222-Positioning slot; 30-Base; 310-Walking wheel; 320-Fixed shaft; 340-Pressure roller; 330-Wheel frame; 322-Fixed shaft; 301-Upper pressure roller mechanism; 302-Lower pressure roller mechanism; 40-Upper pressure roller frame; 410-Connecting plate; 50-Lighting lamp. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] See Figure 1-4 A heating structure for a plastic film welding machine includes a frame 100 and an upper pressure roller 101 and a lower pressure roller 102 disposed on the frame for pressing plastic film. A hot wedge 20 for heating the plastic film is disposed between the upper pressure roller and the lower pressure roller.

[0021] Similar to the operation of commonly used plastic film welding machines, the upper pressure roller 101 and the lower pressure roller 102 are driven to rotate in opposite directions by a drive mechanism. During operation, the hot wedge 20 has an electric heating tube inside. Under electric heating, two plastic films with adhesive are passed through the upper part of the hot wedge 20 and the lower surface of the hot wedge 20, and finally bonded together under the pressure of the upper pressure roller 101 and the lower pressure roller 102.

[0022] The upper and lower parts of the hot wedge 20 are respectively provided with a pressing wheel mechanism 30 for attaching the plastic film to the hot wedge. The pressing wheel mechanism includes a bracket 310, a fixed shaft 320 fixed in the middle of the bracket, a rotatable wheel frame 330 sleeved on the fixed shaft 320, and rotatable pressing wheels 340 located at both ends of the wheel frame.

[0023] During operation, the pressing roller 340 is mounted on a wheel frame 330 that can swing around a fixed axis 320, thus better adapting to films of different thicknesses. In this embodiment, the pressing roller mechanism 30 is located on the upper and lower sides of the hot wedge 20. In this embodiment, the pressing roller mechanism 30 located on the upper part of the hot wedge 20 is the upper pressing roller mechanism 301, and the pressing roller mechanism 30 located on the lower part of the hot wedge 20 is the lower pressing roller mechanism 302. The two mechanisms have the same specific structural principle, only their positions are different.

[0024] Taking the pressing wheel mechanism 301 as an example, a fixed shaft 320 is fixed in the middle of the bracket 310. The fixed shaft 320 is fitted with a rotatable wheel frame 330. The wheel frame has rotatable pressing wheels 340 at both ends of the fixed shaft. When the film passes over the upper surface of the pressing wheel 340 and the hot wedge 20, the film will fill the gap between the pressing wheel 340 and the hot wedge 20. Since the pressing wheel 340 is actually connected to the fixed shaft in a hinged form, it can satisfy adaptive oscillation, and thus apply pressure to the film more evenly.

[0025] Similarly, the working principle of the lower pressing wheel mechanism 302 is also similar. It can make the film on the lower surface of the hot wedge 20 smoother by using the characteristic that the two pressing wheels 340 can swing around the fixed axis 320.

[0026] In one embodiment of this utility model, the frame 100 is provided with an upper pressure roller frame 40, the upper pressure roller 101 is hinged to the front side of the upper pressure roller frame 40, and the lower part of the upper pressure roller frame is fixed with an obliquely extending connecting plate 410. The fixed shaft 320 of the upper pressure roller mechanism 301 located on the upper part of the hot wedge is fixedly connected to the connecting plate 410.

[0027] The frame has a base 30 at its lower part, and two traveling wheels 310 are provided on both sides of the base 30. The fixed shaft of the pressing wheel mechanism 302 at the lower part of the hot wrench 20 is fixedly connected to the base 30. During the process of pressing the film with the lower pressing wheel 101 and the upper pressing wheel 102, the two traveling wheels 310 also move along the length of the film.

[0028] In another embodiment of this utility model, the pressing wheels 340 on the wheel frame are symmetrically arranged about the fixed shaft 320.

[0029] In another embodiment of this utility model, the hot-pressing blade 20 gradually shrinks from the input end to the output end of the plastic film material, and the upper and lower surfaces of the hot-pressing blade are arc-shaped. The arc shape of the upper and lower surfaces of the hot-pressing blade 20 can make the films on the upper and lower surfaces of the hot-pressing blade 20 gradually approach each other during the bonding process.

[0030] In order to better maintain the hot wedge 20, the hot wedge 20 includes a housing 210, an upper heating block 220 and a lower heating block 230 are provided inside the housing, and an electric heating rod 240 is sandwiched between the upper heating block 220 and the lower heating block 230 and is horizontally arranged along the film conveying direction.

[0031] The lower surface of the lower heating block 230 and the lower surface of the upper heating block 220 have grooves 250 for embedding electric heating rods. The front end of the upper heating block 220 extends downward to form a slot 221 for embedding the lower heating block. The slot 221 also has a positioning groove 222 for limiting the electric heating rod 240.

[0032] In this embodiment, the lower heating block 230 is connected to the upper heating block 220 and the outer casing 210 by bolts. In this embodiment, the heating wrench 20 is composed of three parts: the lower heating block 230, the upper heating block 220, and the outer casing 210, which facilitates the disassembly of the heating wrench 20 and allows for quick replacement and fixation of the electric heating rod 240.

[0033] In this embodiment, in order to facilitate observation of the film adhesion at night or in areas with poor lighting, a lighting lamp 50 is fixed on the top of the frame 100.

[0034] In this embodiment, the pressure roller drive mechanism is a motor. When the upper pressure roller 101 and the lower pressure roller 102 work, they rotate in opposite directions, thereby driving the film to adhere while continuously moving forward. The upper pressure roller 101 and the lower pressure roller 102 can be driven by separate motors, with the motors directly driving the upper pressure roller 101 and the lower pressure roller 102 to work separately. Alternatively, they can be similar to the structure of existing plastic film welding machines, where a single motor drives the upper pressure roller 101 and the lower pressure roller 102 to rotate synchronously through two sets of chain drives.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A heating structure for a plastic film welding machine, comprising a frame and an upper pressure roller and a lower pressure roller mounted on the frame for pressing plastic film, wherein a heating blade for heating the plastic film is disposed between the upper pressure roller and the lower pressure roller, characterized in that, The upper and lower parts of the hot wedge are respectively provided with a pressing wheel mechanism for adhering the plastic film to the hot wedge. The pressing wheel mechanism includes a bracket, a fixed shaft is fixed in the middle of the bracket, a rotatable wheel frame is sleeved on the fixed shaft, and the wheel frame has rotatable pressing wheels at both ends of the fixed shaft.

2. The heating structure of a plastic film welding machine according to claim 1, characterized in that, The frame is provided with an upper pressure roller frame, the upper pressure roller is hinged to the front side of the upper pressure roller frame, and the lower part of the upper pressure roller frame is fixed with an obliquely extending connecting plate. The fixed shaft of the upper pressing roller mechanism of the hot wedge is fixedly connected to the connecting plate.

3. The heating structure of a plastic film welding machine according to claim 1 or 2, characterized in that, The frame has a base at its lower part, and the base is provided with wheels on both sides. The pressing wheel mechanism at the lower part of the hot wedge is fixedly connected to the base with its fixed shaft.

4. The heating structure of a plastic film welding machine according to claim 1, characterized in that, The hot-tie blade gradually shrinks from the input end to the output end of the plastic film material, and the upper and lower surfaces of the hot-tie blade are arc-shaped.

5. The heating structure of a plastic film welding machine according to claim 1, characterized in that, The hot wedge includes a housing, inside which are disposed an upper heating block and a lower heating block, and between the upper heating block and the lower heating block is an electric heating rod horizontally disposed along the film conveying direction.

6. The heating structure of a plastic film welding machine according to claim 5, characterized in that, The lower surface of the lower heating block and the lower surface of the upper heating block have grooves for embedding electric heating rods. The front end of the upper heating block extends downward to form a slot for embedding the lower heating block. The slot also has a positioning groove for limiting the electric heating rod.

7. A heating structure for a plastic film welding machine according to claim 5 or 6, characterized in that, The lower heating block is connected to the upper heating block and the outer casing by bolts.

8. The heating structure of a plastic film welding machine according to claim 1, characterized in that, A light is fixed to the top of the frame.

9. The heating structure of a plastic film welding machine according to claim 1, characterized in that, The upper and lower pressure rollers are driven by a motor to rotate in opposite directions.

10. The heating structure of a plastic film welding machine according to claim 1, characterized in that, The pressing wheels on the wheel frame are arranged symmetrically about a fixed axis.

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