A film blowing machine edge splitting device

Abstract

The utility model provides a kind of film blowing machine divides edge device, including rack, the both sides of the rack are equipped with edge cutting mechanism, the edge cutting mechanism includes connecting rod, one end of the connecting rod is equipped with cutter mechanism, the cutter mechanism includes locating block, the locating block includes vertical section, the vertical section one side is equipped with cutter, the other end of the connecting rod is equipped with snap ring, the connecting rod outer sleeve is equipped with cylinder, the cylinder is slidably connected with the connecting rod, one end of the cylinder is equipped with spring, the spring is sleeved on the connecting rod outer, one end of the spring is abutted with one end of the cylinder, the other end of the spring is abutted with the snap ring. By setting snap ring on connecting rod and cooperating with spring, combined with the sliding connection structure of cylinder and connecting rod, make cutter mechanism always close to tubular film inner wall under the action of spring elasticity, realize dynamic follow-up compensation in cutting process, effectively avoid the phenomenon of cutting, cutting deviation or wire drawing due to membrane bubble dithering, traction deviation.

Description

Technical Field

[0001] This utility model relates to the field of edge-separating device technology, and in particular to an edge-separating device for a blown film machine. Background Technology

[0002] In the production of plastic film, the blown film machine is one of the key pieces of equipment. Its function is to extrude molten plastic through a ring die and inflate it into a tubular film (referred to as "tube film"). This tube film moves downward under the action of traction rollers. However, in subsequent processing or use, it is often necessary to flatten it into a single-layer planar film. For this purpose, the tubular film must be cut in half axially before winding. This process, called "splitting," is a crucial step in achieving film flattening.

[0003] Currently, most common edge-cutting devices use fixed blades mounted on both sides of the frame to longitudinally cut the tubular film at two predetermined cutting positions. However, due to issues such as film bubble vibration, uneven air pressure, thickness fluctuations, and traction offset during the film blowing process, the actual cutting path dynamically deviates from the preset position. The cutting blade structures in existing equipment mostly lack adaptive adjustment capabilities, failing to keep pace with the changing cutting edge in real time, easily leading to incomplete cuts, off-center cuts, stringing, or even tearing. Furthermore, some devices are difficult to adjust, requiring manual correction after machine shutdown, severely impacting production continuity and product quality stability.

[0004] The purpose of this invention is to solve the problems of existing blown film machine edge-separation devices being unable to smoothly adhere to the cut edge of tubular films, being difficult to adjust, and affecting production stability. Utility Model Content

[0005] The purpose of this invention is to solve the problems of existing blown film machine edge-separating devices failing to dynamically and tightly adhere to the cut edge of tubular films, being difficult to adjust, and affecting production stability. This invention adopts the following technical solution: A film blowing machine edge-separating device includes a frame, with edge-cutting mechanisms installed on both sides of the frame. Each edge-cutting mechanism includes a connecting rod, with a cutting mechanism installed at one end of the connecting rod. The cutting mechanism includes a positioning block, which has a vertical section. A cutting blade is provided on one side of the vertical section. A retaining ring is provided at the other end of the connecting rod. A cylindrical body is sleeved on the connecting rod and slidably connected to the connecting rod. A spring is provided at one end of the cylindrical body, which is sleeved on the connecting rod. One end of the spring abuts against one end of the cylindrical body, and the other end of the spring abuts against the retaining ring.

[0006] As described above, in a blown film machine edge-separating device, the positioning block further includes a horizontal part, the horizontal part is provided with a clamping block, the clamping block is provided with a clamping groove for clamping a cutter, the side wall of the clamping block is provided with a first threaded hole communicating with the clamping groove, and a second top pin is threadedly connected to the threaded hole.

[0007] As described above, in a blown film machine edge-separating device, the cutter is installed on one side of the vertical section of the positioning block along an inclined direction, and the end of the cutter near the vertical section is positioned higher in the vertical direction than the end away from the vertical section.

[0008] As described above, in a blown film machine edge-separating device, the cylinder body has a sliding groove that penetrates the side wall along the axial direction. The cutting mechanism also includes a slider that is fixedly connected to one end of the connecting rod. One side of the slider passes through the sliding groove and is fixedly connected to the horizontal part of the positioning block. The slider slides in cooperation with the sliding groove.

[0009] As described above, in a blown film machine edge-separating device, the top of the vertical section near the cutter has a rounded corner.

[0010] As described above, in a blown film machine edge-separating device, one end of the cylinder is provided with a through hole, and the inner contour shape of the through hole matches the cross-sectional shape of the connecting rod.

[0011] As described above, in a blown film machine edge-separating device, a collar is provided on the outer sleeve of the cylinder body, the collar is slidably engaged with the cylinder body, and a through second threaded hole is provided on the side wall of the collar, with a first top pin threadedly connected to the inner thread of the second threaded hole.

[0012] In the blown film machine edge-separating device described above, the retaining ring is installed on the connecting rod by a threaded connection.

[0013] Implementing the embodiments of this utility model has the following beneficial effects: In this invention, by setting a retaining ring on the connecting rod and cooperating with a spring, combined with the sliding connection structure between the cylinder and the connecting rod, the cutting mechanism is kept in close contact with the inner wall of the tubular film under the action of the spring force, realizing dynamic follow-up compensation during the cutting process. This effectively avoids phenomena such as incomplete cutting, off-center cutting, or stringing caused by film bubble vibration and traction deviation. At the same time, the stable clamping force provided by the spring ensures that the cutter continuously and reliably cuts the tubular film into two halves along the axial direction, improving the stability and consistency of the edge splitting. Moreover, the overall structure is simple and compact, easy to adjust, and does not require frequent machine shutdowns for maintenance, significantly improving the production stability and product quality of the blown film process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1This is a schematic diagram of the overall structure of a film blowing machine edge-separating device according to the present invention.

[0016] Figure 2 This is a schematic diagram of the edge-cutting mechanism of a blown film machine edge-splitting device according to the present invention.

[0017] Figure 3 yes Figure 2 A structural diagram from another angle.

[0018] Figure 4 This is an exploded view of the edge-cutting mechanism of a blown film machine edge-separating device according to this utility model.

[0019] Figure 5 This is a diagram showing the working state of a film blowing machine edge-separating device according to this utility model.

[0020] As shown in the figure: 1. Frame; 2. Trimming mechanism; 21. Cylinder; 211. Slide groove; 212. Through hole; 22. Collar; 221. First top pin; 23. Positioning block; 24. Cutter; 25. Spring; 26. Connecting rod; 261. Snap ring; 27. Clamping block; 271. Second top pin; 28. Slider. 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] like Figures 1 to 5As shown, this utility model proposes a film blowing machine edge-cutting device, including a frame 1. Edge-cutting mechanisms 2 are installed on both sides of the frame 1. Each edge-cutting mechanism 2 includes a connecting rod 26, with a cutting mechanism installed at one end of the connecting rod 26. The cutting mechanism includes a positioning block 23, which has a vertical section. A cutter 24 is provided on one side of the vertical section. A retaining ring 261 is provided at the other end of the connecting rod 26. A cylindrical body 21 is sleeved on the connecting rod 26 and slidably connected to it. A spring 25 is provided at one end of the cylindrical body 21, which is sleeved on the connecting rod 26. One end of the spring 25 abuts against one end of the cylindrical body 21, and the other end abuts against the retaining ring 261. The edge-cutting mechanisms 2 on both sides of the frame 1 correspond to two longitudinal cutting positions of the tubular film. As the tubular membrane moves downwards, the vertical section of the positioning block 23 first contacts the inner wall of the tubular membrane. At this time, the spring 25, with one end abutting against one end of the cylinder 21 and the other end abutting against the retaining ring 261, applies a continuous elastic force towards the tubular membrane to the connecting rod 26. This elastic force is transmitted through the connecting rod 26 to the positioning block 23 connected to one end, ensuring that the vertical section of the positioning block 23 remains in close contact with the inner wall of the tubular membrane. As the tubular membrane continues to descend, the cutter 24, fixed to one side of the vertical section, moves synchronously. Under the stable clamping force provided by the spring 25, the tubular membrane is smoothly cut into two halves axially, achieving continuous edge splitting. The above structure effectively solves the problems of incomplete cutting or off-center cutting caused by membrane bubble vibration or traction deviation. It has the advantages of sensitive response, good follow-up, and no need for frequent adjustments, thus improving the production stability and edge splitting quality of the blown film process.

[0023] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the positioning block 23 further includes a horizontal portion, which is provided with a clamping block 27. The clamping block 27 has a clamping groove for clamping the cutter 24. The side wall of the clamping block 27 has a first threaded hole communicating with the clamping groove, and a second top pin 271 is threadedly connected to the threaded hole. When it is necessary to fix the cutter 24, the second top pin 271 is screwed into the first threaded hole on the side wall of the clamping block 27. As the second top pin 271 goes deeper into the clamping groove, its end abuts against the side of the cutter 24, and it is firmly clamped in the clamping groove by friction. When it is necessary to replace the cutter 24, the second top pin 271 is rotated in the opposite direction to release the clamping force on the cutter 24, and the old cutter can be taken out of the clamping groove and replaced with a new one. The operation is simple and quick.

[0024] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the cutter 24 is mounted on one side of the vertical segment of the positioning block 23 along an inclined direction, with the end of the cutter 24 near the vertical segment positioned higher in the vertical direction than the end away from the vertical segment. When the tubular film moves downward and comes into contact with the cutter 24, the higher end of the cutter 24 contacts the film surface first. As the film continues to descend, the cutting action gradually unfolds from the inside out, forming a progressive cutting process. This effectively reduces the initial cutting resistance and facilitates smooth completion of longitudinal slitting.

[0025] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the cylindrical body 21 is provided with a groove 211 extending through the sidewall along the axial direction. The cutting mechanism also includes a slider 28 fixedly connected to one end of the connecting rod 26. One side of the slider 28 passes through the groove 211 and is fixedly connected to the horizontal part of the positioning block 23. The slider 28 slides in cooperation with the groove 211. When the tubular film exerts a force on the cutter 24, the force is transmitted to the slider 28 through the positioning block 23, causing the connecting rod 26 to slide axially within the cylindrical body 21. The slider 28 moves synchronously within the groove 211, achieving guiding and limiting, ensuring stable motion trajectory. At the same time, the spring 25 provides restoring force, keeping the cutting mechanism always close to the film edge.

[0026] Optionally, in some embodiments, a rounded corner is provided at one corner of the vertical segment near the cutter 24. When the tubular film moves downward, its inner wall contacts and slides relative to the vertical segment of the positioning block 23. The rounded corner allows the tubular film to transition smoothly, reducing scratches and stress concentration on the film surface caused by sharp corners, effectively reducing the frictional resistance between the positioning block 23 and the tubular film, and avoiding film damage or fraying due to sharp edge scratches or material snagging.

[0027] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, one end of the cylinder 21 is provided with a through hole 212, the inner contour shape of the through hole 212 matching the cross-sectional shape of the connecting rod 26. When the connecting rod 26 passes through the inside of the cylinder 21 and slides axially, its outer periphery forms a sliding fit with the through hole 212. Under the elastic force of the spring 25, the connecting rod 26 always moves stably along the guiding direction of the through hole 212, ensuring that the cutting mechanism connected to it maintains the correct posture and achieving accurate cutting of the tubular film.

[0028] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the cylinder 21 is fitted with a collar 22, which slides within the cylinder 21. The collar 22 has a through-hole second threaded hole on its side wall, and a first top pin 221 is threaded into the second threaded hole. When the cutting edge position needs to be adjusted, the first top pin 221 is first loosened, allowing the cylinder 21 to slide within the collar 22. The axial position of the cylinder 21 and the cutting mechanism mounted on it is then adjusted according to the actual position of the tubular film. After alignment, the first top pin 221 is tightened again, so that its end abuts against the outer wall of the cylinder 21, thereby fixing the cylinder 21 in the set position and completing the positioning. The cylinder 21 can be removed from the collar 22, facilitating the flexibility and ease of maintenance of the equipment.

[0029] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the retaining ring 261 is threadedly mounted on the connecting rod 26. When it is necessary to adjust the preload of the spring 25, the axial position of the retaining ring 261 on the connecting rod 26 is changed by turning the retaining ring 261, thereby adjusting the compression between one end of the spring 25 and the end of the cylinder 21. The other end of the spring 25 abuts against the retaining ring 261, so the change in the position of the retaining ring directly controls the degree of deformation of the spring 25, thereby adjusting the magnitude of the elastic force acting on the connecting rod 26. The elastic force is transmitted to the cutting mechanism 2 via the connecting rod 26, ultimately affecting the adhesion pressure of the positioning block 23 and the cutter 24 to the tubular film.

[0030] Example 1: This utility model proposes a film blowing machine edge-cutting device, including a frame 1. Edge-cutting mechanisms 2 are installed on both sides of the frame 1. Each edge-cutting mechanism 2 includes a connecting rod 26, with a cutting mechanism installed at one end of the connecting rod 26. The cutting mechanism includes a positioning block 23, which has a vertical section. A cutter 24 is provided on one side of the vertical section. A retaining ring 261 is provided at the other end of the connecting rod 26. A cylinder 21 is sleeved on the connecting rod 26 and slidably connected to it. A spring 25 is provided at one end of the cylinder 21, sleeved on the connecting rod 26. One end of the spring 25 abuts against one end of the cylinder 21, and the other end abuts against the retaining ring 261. The edge-cutting mechanisms 2 on both sides of the frame 1 correspond to two longitudinal cutting positions of the tubular film. As the membrane moves downwards, the vertical section of the positioning block 23 first contacts the inner wall of the membrane. At this time, the spring 25, with one end abutting against one end of the cylinder 21 and the other end abutting against the retaining ring 261, applies a continuous elastic force towards the membrane to the connecting rod 26. This elastic force is transmitted through the connecting rod 26 to the positioning block 23 connected to one end, ensuring that the vertical section of the positioning block 23 remains in close contact with the inner wall of the membrane. As the membrane continues to descend, the cutter 24, fixed to one side of the vertical section, moves synchronously. Under the stable clamping force provided by the spring 25, the membrane is smoothly cut into two halves axially, achieving continuous edge separation. The above structure effectively solves the problems of incomplete cutting or off-center cutting caused by membrane bubble vibration or traction deviation. It has the advantages of sensitive response, good follow-up, and no need for frequent adjustments, improving the production stability and edge separation quality of the blown film process. The cutter 24 is installed on one side of the vertical section of the positioning block 23 in an inclined direction, with the end of the cutter 24 closer to the vertical section positioned higher in the vertical direction than the end further away from the vertical section. When the tubular film moves downwards and contacts the cutter 24, the higher end of the cutter 24 contacts the film surface first. As the film continues to descend, the cutting action gradually unfolds from the inside out, forming a progressive cutting process. This effectively reduces the initial cutting resistance and facilitates smooth longitudinal slitting. A rounded corner is provided at the top of the vertical section near the cutter 24. When the tubular film moves downwards, its inner wall contacts and slides relative to the vertical section of the positioning block 23. The rounded corner allows the tubular film to transition smoothly, reducing scratches and stress concentration on the film surface from sharp corners. This effectively reduces the frictional resistance between the positioning block 23 and the tubular film, preventing film damage or stringing due to sharp edge scratches or material snagging. The retaining ring 261 is threaded onto the connecting rod 26. When it is necessary to adjust the preload of the spring 25, the axial position of the retaining ring 261 on the connecting rod 26 is changed by turning it, thereby adjusting the compression between one end of the spring 25 and the end of the cylinder 21. The other end of the spring 25 abuts against the retaining ring 261. Therefore, the change in the position of the retaining ring directly controls the degree of deformation of the spring 25, thereby adjusting the magnitude of the elastic force acting on the connecting rod 26. The elastic force is transmitted to the cutting mechanism 2 via the connecting rod 26, ultimately affecting the adhesion pressure of the positioning block 23 and the cutter 24 to the tubular film.

[0031] The positioning block 23 also includes a horizontal part, which is equipped with a clamping block 27. The clamping block 27 has a clamping groove for clamping the cutter 24. The side wall of the clamping block 27 has a first threaded hole communicating with the clamping groove, and a second top pin 271 is threaded into the threaded hole. When it is necessary to fix the cutter 24, the second top pin 271 is screwed into the first threaded hole on the side wall of the clamping block 27. As the second top pin 271 goes deeper into the clamping groove, its end presses against the side of the cutter 24, and the cutter is firmly clamped in the clamping groove by friction. When it is necessary to replace the cutter 24, the second top pin 271 is loosened by rotating it in the opposite direction, the clamping force on the cutter 24 is released, and the old cutter can be taken out of the clamping groove and replaced with a new cutter. The operation is simple and quick.

[0032] The cylinder 21 has an axially extending groove 211 that passes through the side wall. The cutting mechanism also includes a slider 28 fixedly connected to one end of the connecting rod 26. One side of the slider 28 passes through the groove 211 and is fixedly connected to the horizontal part of the positioning block 23. The slider 28 and the groove 211 are in sliding engagement. When the tubular film exerts a force on the cutter 24, the force is transmitted to the slider 28 through the positioning block 23, causing the connecting rod 26 to slide axially within the cylinder 21. The slider 28 moves synchronously within the groove 211, achieving guide and limit positioning to ensure stable motion trajectory. At the same time, the spring 25 provides restoring force, keeping the cutting mechanism always close to the film edge.

[0033] One end of the cylinder 21 is provided with a through hole 212, the inner contour shape of which matches the cross-sectional shape of the connecting rod 26. When the connecting rod 26 passes through the inside of the cylinder 21 and slides axially, its outer circumference forms a sliding fit with the through hole 212. Under the action of the spring force 25, the connecting rod 26 always moves stably along the guide direction of the through hole 212, ensuring that the cutter mechanism connected to it maintains the correct posture and achieves accurate cutting of the tubular film.

[0034] A collar 22 is fitted over the cylindrical body 21, and the collar 22 slides within the cylindrical body 21. A second threaded hole is formed in the side wall of the collar 22, and a first top pin 221 is threaded into the second threaded hole. When the cutting edge position needs to be adjusted, the first top pin 221 is first loosened, allowing the cylindrical body 21 to slide within the collar 22. The axial position of the cylindrical body 21 and the cutting mechanism mounted on it is then adjusted according to the actual position of the tubular film. After alignment, the first top pin 221 is tightened again, so that its end abuts against the outer wall of the cylindrical body 21, thereby fixing the cylindrical body 21 in the set position and completing the positioning. The cylindrical body 21 can be removed from the collar 22, facilitating equipment flexibility and maintenance convenience.

[0035] Specifically, the working principle of this invention is as follows: When the tubular membrane moves downward, its inner wall first contacts the vertical section of the positioning block 23. At this time, the spring 25 abuts against one end of the cylinder 21 and the other end abuts against the retaining ring 261, applying a continuous elastic force towards the membrane on the connecting rod 26. This elastic force is transmitted through the connecting rod 26 to the positioning block 23 connected to one end of it, so that the vertical section always fits tightly against the inner wall of the membrane. The cutter 24 moves synchronously and smoothly cuts the membrane in half along the axial direction. When the membrane bubble vibrates or is pulled off course, the connecting rod 26 can slide axially inside the cylinder 21 to achieve dynamic buffering and follow-up compensation, ensuring continuous and stable cutting.

[0036] The cutter 24 is installed on one side of the vertical section of the positioning block 23 along an inclined direction, with the end closer to the vertical section being higher than the end further away, forming a gradual cutting path from high to low. When the film descends and contacts the cutter 24, the higher end contacts the film surface first, and the cutting action gradually unfolds from the inside to the outside, reducing instantaneous cutting resistance. At the same time, a rounded corner is provided at the top of the vertical section of the positioning block 23 near the cutter 24, so that the tubular film can smoothly transition during the sliding process, reducing sharp edge scratches, effectively reducing frictional resistance, and avoiding scratches or stringing.

[0037] During adjustment, the axial position of the retaining ring 261 on the connecting rod 26 can be changed by turning the retaining ring 261, thereby adjusting the compression of the spring 25 and realizing stepless adjustment of the clamping force of the cutter 24. When it is necessary to correct the cutting edge position, the first top pin 221 on the side wall of the collar 22 is loosened, allowing the cylinder 21 to slide inside the collar 22. After the axial displacement is completed, the first top pin 221 is tightened to lock it. In addition, the slider 28 passes through the slide groove 211 on the cylinder 21 and is connected to the positioning block 23. During movement, it slides with the slide groove 211 to play a guiding and anti-rotation role. The through hole 212 at the end of the cylinder 21 matches the cross-sectional shape of the connecting rod 26, further ensuring that the connecting rod slides smoothly and has an accurate posture.

[0038] In summary, this invention solves the problems of existing blown film machine edge-separation devices being unable to smoothly adhere to the cut edge of tubular films, being difficult to adjust, and affecting production stability.

[0039] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0040] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A film blowing machine edge-cutting device, comprising a frame (1), wherein edge-cutting mechanisms (2) are installed on both sides of the frame (1), characterized in that, The cutting mechanism (2) includes a connecting rod (26), one end of which is equipped with a cutting mechanism. The cutting mechanism includes a positioning block (23), which includes a vertical section. A cutting blade (24) is provided on one side of the vertical section. A retaining ring (261) is provided on the other end of the connecting rod (26). A cylindrical body (21) is sleeved on the connecting rod (26). The cylindrical body (21) is slidably connected to the connecting rod (26). A spring (25) is provided at one end of the cylindrical body (21). The spring (25) is sleeved on the connecting rod (26). One end of the spring (25) abuts against one end of the cylindrical body (21), and the other end of the spring (25) abuts against the retaining ring (261).

2. The film blowing machine edge-separating device according to claim 1, characterized in that, The positioning block (23) also includes a horizontal part, the horizontal part is provided with a clamping block (27), the clamping block (27) is provided with a clamping groove for clamping the cutter (24), the side wall of the clamping block (27) is provided with a first threaded hole communicating with the clamping groove, and a second top pin (271) is threadedly connected to the threaded hole.

3. The film blowing machine edge-separating device according to claim 1, characterized in that, The cutter (24) is installed on one side of the vertical section of the positioning block (23) in an inclined direction, and the end of the cutter (24) near the vertical section is positioned higher in the vertical direction than the end away from the vertical section.

4. The film blowing machine edge-separating device according to claim 1, characterized in that, The cylinder (21) has a groove (211) that runs through the side wall along the axial direction. The cutting mechanism also includes a slider (28) that is fixedly connected to one end of the connecting rod (26). One side of the slider (28) passes through the groove (211) and is fixedly connected to the horizontal part of the positioning block (23). The slider (28) slides in cooperation with the groove (211).

5. The film blowing machine edge-separating device according to claim 1, characterized in that, The top of the vertical segment has a rounded corner near the corner of the cutter (24).

6. The film blowing machine edge-separating device according to claim 1, characterized in that, One end of the cylinder (21) is provided with a through hole (212), and the inner contour shape of the through hole (212) matches the cross-sectional shape of the connecting rod (26).

7. The film blowing machine edge-separating device according to claim 1, characterized in that, The cylinder (21) is fitted with a collar (22), which slides with the cylinder (21). The side wall of the collar (22) has a through second threaded hole, and a first top pin (221) is threaded into the second threaded hole.

8. The film blowing machine edge-separating device according to claim 1, characterized in that, The retaining ring (261) is threadedly installed on the connecting rod (26).

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