Auxiliary film pulling device of a film blowing machine

Abstract

The utility model discloses a kind of auxiliary membrane pulling device of film blowing machine, including two traction chains and two clamps. Two traction chains are placed in the left and right sides of the herringbone support plate of film blowing machine, traction chain is fixed on the rack of film blowing machine, can be up and down circulation transmission, the upper end of traction chain is located above the traction roller of film blowing machine, the upward traction surface of traction chain is located between two traction rollers, the downward traction surface of traction chain is located in front of a traction roller;Two clamps are respectively fixed on two traction chains. After film is extruded from film blowing die head, it is pulled upwards by membrane pulling device, after film reaches the traction roller at the top end of film blowing machine, 180 ° rotation changes direction, and then is pulled downwards to the height that staff can get film on ground, realize automatic membrane pulling, traction speed is uniform, and membrane pulling efficiency is high, then membrane pulling device releases film, staff manually pull membrane, after being guided on the supporting roller of film blowing machine, reach the winding roller at the bottom of film blowing machine and be wound.

Description

Technical Field

[0001] This utility model relates to the field of blown film machine technology, and in particular to an auxiliary film pulling device for blown film machines. Background Technology

[0002] A blown film machine is a piece of equipment used to produce plastic film, and it is widely used in packaging, agriculture, construction and other fields. After heating and melting plastic granules, the molten plastic is filtered through the die head to remove impurities and comes out of the blown film die to form a tubular film. After being cooled upward by the air ring, the herringbone plate and two traction rollers, it is wound downward by the winding device and then wound onto the winding roller.

[0003] In the masterbatch production industry, blown film machines are also commonly used to evaluate the dispersion of masterbatch in resin. They are essential for evaluation during both production and R&D processes. Due to varying product demands and manufacturer capacity, blown film machines come in different sizes, with blown film heights ranging from several meters to tens of meters.

[0004] When the blown film machine is large, a problem arises during production and testing: the film travels a considerable distance from the blown film die to the traction roller at the top of the equipment and then down to the take-up roller at the bottom. This traction process becomes relatively complex. Uneven manual film pulling speed can lead to film breakage or uneven film thickness. Manual pulling while climbing over a high platform poses certain personal safety hazards and has low traction efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an auxiliary film pulling device for a blown film machine, which realizes automatic film pulling, uniform pulling speed, and high film pulling efficiency.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] An auxiliary film-pulling device for a blown film machine, installed on the blown film machine, includes:

[0008] Two traction chains are positioned on the left and right sides of the herringbone support plate of the blown film machine. These chains are fixed to the frame of the blown film machine and can rotate vertically. The upper end of each traction chain is located above the traction rollers of the blown film machine. The plane containing the upward traction surface of the traction chain is located between the two traction rollers, and the downward traction surface of the traction chain is located in front of one of the traction rollers.

[0009] Two clamps are fixed to the two traction chains respectively.

[0010] A further technical solution is that, on the left and right sides of the frame, a drive sprocket and a driven sprocket are rotatably fixed at the upper and lower ends of each side, respectively. The traction chain meshes with the drive sprocket and the driven sprocket to achieve cyclic transmission. The drive sprocket is connected to a chain drive motor that drives its rotation.

[0011] A further technical solution is that a number of auxiliary sprockets are provided between the driving sprocket and the driven sprocket on the same side. The auxiliary sprockets are rotatably fixed on the frame and mesh with the traction chain for transmission.

[0012] A further technical solution is that the clamp is fixed to the traction chain by a traction rope.

[0013] A further technical solution is that the two traction ropes connecting the two clamps are of the same length, and the fixed positions of the two traction ropes and the corresponding traction chains are symmetrical.

[0014] A further technical solution is that the clamp includes two clamping plates arranged crosswise, and a rotating shaft is inserted at the intersection of the two clamping plates. The clamping plates form clamping ends and tail ends on both sides of the rotating shaft. A torsion spring is provided on the rotating shaft, and the two ends of the torsion spring contact the tail ends of the two clamping plates.

[0015] A further technical solution is that the inner surfaces of the two clamping ends on the fixture are clamping surfaces, and the clamping surfaces are provided with a plurality of protruding clamping teeth.

[0016] A further technical solution is that the clamping surface is a wedge-shaped surface, and the clamping end gradually thins from the opening inward, so that a rectangular clamping cavity can be formed between the two clamping surfaces.

[0017] A further technical solution is that the clamp is made of stainless steel.

[0018] A further technical solution is that the tail end of the clamp has a rope hole.

[0019] The beneficial effects of adopting the above technical solution are as follows:

[0020] This film blowing machine auxiliary film pulling device is installed on the film blowing machine. After the film is extruded from the film blowing die, it is pulled upward by the film pulling device. After the film reaches the traction roller at the top of the film blowing machine, it rotates 180° to change direction and is then pulled downward to a height that the operator can reach while standing on the ground. This achieves automatic film pulling, uniform pulling speed, and high film pulling efficiency. Then the film pulling device releases the film, and the operator manually pulls the film. After being guided by the rollers on the film blowing machine, it reaches the winding roller at the bottom of the film blowing machine for winding. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0023] Figure 2 This is a top view schematic diagram of the structure of this utility model (the traction chain is not shown in the figure);

[0024] Figure 3 This is a structural diagram of the left side of this utility model;

[0025] Figure 4 This is a schematic diagram of the fixture in this utility model. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of this utility model, unless otherwise stated, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] like Figures 1-3 As shown, an auxiliary film-pulling device for a blown film machine is installed on the blown film machine. After the film is extruded from the blown film die head 2, it is pulled upward by the film-pulling device. After the film reaches the traction roller 7 at the top of the blown film machine, it rotates 180° to change direction and is then pulled downward to a height that the worker can reach while standing on the ground. The film-pulling device releases the film, and the worker manually pulls the film. After being guided by the support roller 12 on the blown film machine, it reaches the winding roller at the bottom of the blown film machine for winding. This achieves automatic film pulling, uniform pulling speed, and high film pulling efficiency.

[0029] The auxiliary film pulling device for the blown film machine includes two traction chains 3 and two clamps 10.

[0030] Example 1:

[0031] The traction chain 3 is made of stainless steel to prevent rust and other rust stains from adhering to the film and affecting product quality. Two traction chains 3 are placed on the left and right sides of the herringbone support plate of the blown film machine, and are arranged symmetrically. On the left and right sides of the frame, a drive sprocket and a driven sprocket are rotatably fixed at the upper and lower ends of each side. The traction chain 3 meshes with the drive sprocket and the driven sprocket to drive the transmission, thereby fixing the traction chain 3 to the frame of the blown film machine. A chain drive motor 11 is connected to the drive sprocket to drive its rotation. By starting the chain drive motor 11, the drive sprocket is rotated, driving the traction chain 3 to circulate in the up and down direction. One side of the traction chain 3 moves upward to form an upward traction surface, and the other side of the traction chain 3 moves downward to form a downward traction surface.

[0032] In addition, to ensure the smooth transmission of the traction chain 3 and to adjust its direction, several auxiliary sprockets 4 are provided between the driving and driven sprockets on the same side. These auxiliary sprockets 4 are rotatably fixed to the frame and engage with the traction chain 3 for transmission. The chain drive motor 11 can be controlled by a frequency converter to adjust its speed, allowing for the selection of different traction speeds according to specific needs.

[0033] The traction chain 3 has specific positioning requirements. Its lower end is positioned close to the blown film die head 2, and can be slightly higher or lower than the die head 2. The lower end of the traction chain 3 is no more than 1.6 meters above the ground, allowing operators to work from the ground. The upper end of the traction chain 3 is located above the traction roller 7. The plane containing the upward traction surface of the traction chain 3 is located between the two traction rollers 7, and the downward traction surface of the traction chain 3 is located in front of one of the traction rollers 7.

[0034] The existing traction roller 7 includes a roller shaft and a roller sleeved on the roller shaft. The roller shaft and roller are fixed coaxially. The diameter of the roller is larger than that of the roller shaft, and both ends of the roller shaft extend outward beyond the roller. During traction, the roller contacts the film material, and the film material is tractioned by the rollers on the two traction rollers 7. The roller shaft does not contact the film material. Figure 1 In this configuration, the traction chain 3 is located at the position of the roller shaft, and the distance between the two traction chains 3 is greater than the length of the roller. Therefore, the arrangement of the traction chains 3 does not affect the traction of the film material by the traction roller 7. Example 2:

[0035] Two clamps 10 are fixed to two traction chains 3 respectively. The clamps 10 hold the starting end of the material, allowing the material to move synchronously with the traction of the traction chains 3. Since the clamps 10 need to directly contact the material in a high-temperature molten state, the clamps 10 are required to be heat-resistant and corrosion-resistant. Therefore, the clamps 10 are made of stainless steel. At the same time, stainless steel does not easily adhere to molten material, making it easier to release the material after traction and to clean the clamps.

[0036] The initial position of the clamp 10 on the traction chain 3 is located on the upper traction surface of the traction chain 3, and the two clamps 10 are at the same height in space.

[0037] After the material is melted and plasticized by the extruder 1 and extruded through the blown film die 2, the extruded molten material is clamped by two clamps 10 on the left and right sides, fixing the starting end of the material to the upper traction surface of the two traction chains 3. Since the two clamps 10 are at the same height in space, the two clamped positions of the material are horizontal, avoiding oblique pulling that could cause deformation of the material; moreover, the clamps 10 on the left and right sides clamp the starting end of the material, ensuring the flatness of the starting end and keeping the subsequent material in a consistent and relaxed state with the starting end during traction.

[0038] Example 3:

[0039] After securing the material to the two traction chains 3, turn on the chain drive motor 11. The two traction chains 3 drive the clamping fixture 10 and the clamped material upwards, passing sequentially between the herringbone clamp and the two traction rollers 7 (one active traction roller and one passive traction roller, with a traction motor 6 connected to the active traction roller to drive its rotation). Because the height of the upward traction surface is higher than that of the traction roller 7, and the downward traction surface is located in front of one of the traction rollers 7, the material can be wound around that traction roller 7. That is, when the clamping fixture 10 is pulled by the upward traction surface to the highest point of the traction chain 3, when it turns downwards, it can pull the material through the space between the two traction rollers 7 and around one of the traction rollers 7.

[0040] Then, the clamp 10 is pulled downward by the downward traction surface. When the clamp 10 runs below the traction chain 3, the chain drive motor 11 is turned off, and the pneumatic cylinder 5 on the blown film machine is turned on to reduce the distance between the two traction rollers 7 (the pneumatic cylinder 5 is connected to the driven traction roller, and the structure for adjusting the distance between the two traction rollers 7 is the existing mechanism of the blown film machine). This causes the two traction rollers 7 to clamp the thin film material and remove the material from the clamp 10. The traction motor 6 on the traction roller 7 is started, and the traction roller 7 is used to pull the material downward. The operator stands on the ground and manually pulls the film. After being guided by the support roller 12 at the bottom of the blown film machine, the material is wound onto the take-up roller.

[0041] Example 4:

[0042] The clamp 10 has a rope hole 102 at its tail end. The clamp 10 is fixed to the traction chain 3 by a traction rope 9. One end of the traction rope 9 passes through the rope hole 102 and is knotted and fixed to the clamp 10. The traction rope 9 can be selected as nylon rope or stainless steel cable as needed. The traction rope 9 can be freely installed and removed from the traction chain 3 and the clamp 10.

[0043] The two traction ropes 9 connecting the two clamps 10 are of the same length, and the fixed positions of the two traction ropes and the corresponding traction chains 3 are symmetrical. This ensures that after the two clamps 10 are clamped and fixed to the material, the starting end of the material is kept at the same height from left to right during traction, preventing tilting and ensuring the balance of traction.

[0044] Example 5:

[0045] like Figure 4 As shown, the clamp 10 adopts a spring clamp structure, including two intersecting clamping plates 101. A rotating shaft passes through the intersection of the two clamping plates 101. Each clamping plate 101 forms a clamping end and a tail end on both sides of the rotating shaft. A torsion spring 104 is mounted on the rotating shaft, with both ends of the torsion spring 104 contacting the tail ends of the two clamping plates 101. In use, pressing the tail ends of the two clamping plates 101 brings them closer together, opening the clamping ends to hold the material. Simultaneously, the torsion spring 104 is twisted to compress and store energy. Releasing the tail ends of the two clamping plates 101 causes the tail ends to open again under the restoring force of the torsion spring 104, closing the clamping ends and fixing the clamp 10 to the material, ensuring a stable clamping force.

[0046] The inner surfaces of the two clamping ends on the clamp 10 are clamping surfaces. Multiple protruding clamping teeth 103 are provided on the clamping surfaces to increase the friction between the clamp 10 and the material after clamping, and to prevent the material from slipping out of the clamp 10.

[0047] The clamping surface of the clamping plate 101 is a wedge-shaped surface. The clamping end of the clamping plate 101 gradually thins from the opening inward, so that the longitudinal section of the clamping end is an acute triangle. A rectangular clamping cavity can be formed between the two clamping surfaces, which can make the entire clamping surface of the clamp 10 contact the material, increase the clamping area with the material, and further improve the stability of clamping the material.

[0048] The above are merely preferred embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. An auxiliary film-pulling device for a blown film machine, mounted on the blown film machine, characterized in that, include: Two traction chains are positioned on the left and right sides of the herringbone support plate of the blown film machine. These chains are fixed to the frame of the blown film machine and can rotate vertically. The upper end of each traction chain is located above the traction rollers of the blown film machine. The plane containing the upward traction surface of the traction chain is located between the two traction rollers, and the downward traction surface of the traction chain is located in front of one of the traction rollers. Two clamps are fixed to the two traction chains respectively.

2. The auxiliary film pulling device of the film blowing machine according to claim 1, characterized in that, On the left and right sides of the frame, a drive sprocket and a driven sprocket are rotatably fixed at the upper and lower ends of each side. The traction chain meshes with the drive sprocket and the driven sprocket to achieve cyclic transmission. The drive sprocket is connected to a chain drive motor that drives its rotation.

3. The auxiliary film pulling device of the film blowing machine according to claim 2, characterized in that, Several auxiliary sprockets are provided between the driving sprocket and the driven sprocket on the same side. The auxiliary sprockets are rotatably fixed on the frame and mesh with the traction chain for transmission.

4. The auxiliary film pulling device of the film blowing machine according to claim 1, characterized in that, The clamp is fixed to the traction chain by a traction rope.

5. The auxiliary film pulling device of the film blowing machine according to claim 4, characterized in that, The two traction ropes connecting the two clamps are of the same length, and the fixed positions of the two traction ropes and the corresponding traction chains are symmetrical.

6. The auxiliary film-pulling device for a blown film machine according to claim 1, characterized in that, The clamp includes two clamping plates arranged in a cross configuration, with a rotating shaft passing through the intersection of the two clamping plates. The clamping plates form clamping ends and tail ends on both sides of the rotating shaft. A torsion spring is provided on the rotating shaft, and the two ends of the torsion spring contact the tail ends of the two clamping plates.

7. The auxiliary film pulling device of the film blowing machine according to claim 6, characterized in that, The inner surfaces of the two clamping ends of the fixture are clamping surfaces, and multiple protruding clamping teeth are provided on the clamping surfaces.

8. The auxiliary film pulling device of the film blowing machine according to claim 7, characterized in that, The clamping surface is a wedge-shaped surface, and the clamping end gradually thins from the opening inward, forming a rectangular clamping cavity between the two clamping surfaces.

9. The auxiliary film pulling device of the film blowing machine according to claim 1, characterized in that, The clamp is made of stainless steel.

10. The auxiliary film pulling device of the film blowing machine according to claim 4, characterized in that, The clamp has a rope hole at its tail end.

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