Ultra-high efficiency film mechanical synchronous stretching track and film production line

Abstract

This application relates to the field of film stretching technology, and discloses an ultra-high efficiency film mechanical synchronous stretching track and film production line. The ultra-high efficiency film mechanical synchronous stretching track includes a chain clamp, a drive chain disc, and a ring guide rail. The drive chain disc is connected to the chain clamp and is used to drive the chain clamp's movement. Only two drive chain discs are provided: a slow-speed chain disc and a fast-speed chain disc. The slow-speed chain disc is located on the inlet side of the high-temperature oven, and the fast-speed chain disc is located on the outlet side of the high-temperature oven. Compared to related technologies where each film mechanical synchronous stretching track has three or four drive chain discs, the ultra-high efficiency film mechanical synchronous stretching track in this application only has two drive chain discs. This reduces the number of drive chain discs, and consequently reduces the number of motors, gearboxes, and electrical control units, thereby simplifying the structure and reducing costs.

Description

Technical Field

[0001] This application relates to the field of film stretching technology, and in particular to an ultra-high efficiency film mechanical synchronous stretching track and film production line. Background Technology

[0002] With the development of polymer film heat treatment technology, synchronous film stretching production lines have emerged. These lines consist of two symmetrical synchronous film stretching tracks. These tracks are spaced apart and run through a high-temperature oven. Each synchronous film stretching track includes a ring guide rail, chain clamps mounted on the ring guide rail, and drive chain discs that drive the chain clamps. Each side of the synchronous film stretching track typically has three or four drive chain discs, with two located on the inlet side of the high-temperature oven and one or two on the outlet side. Of the two drive chain discs on the inlet side of the high-temperature oven, one is a high-speed chain disc and the other a slow-speed chain disc; the drive chain disc on the outlet side of the high-temperature oven is the high-speed chain disc. The ring guide rail includes a preheating section, a stretching section, a shaping section, a cooling section, and a return section arranged sequentially along the chain clamp's running direction. The drive chain discs cooperate to drive the chain clamps in a cyclical reciprocating motion along the ring guide rail. The film is pulled along the track by chain clamps moving along the track on both sides along the width direction. According to the process requirements, the film is continuously stretched, tightened or relaxed in both longitudinal and transverse directions or in any direction according to the running direction of the chain clamps.

[0003] In related technologies, synchronous film stretching production lines require a recovery section at the entrance of the high-temperature oven between the slow-speed and fast-speed chain discs to prevent tooth skipping during the slow-speed chain drive process. This recovery section dynamically changes the adjacent chain clamps from complete separation to close proximity, improving the stability of the slow-speed chain drive. Consequently, these synchronous film stretching production lines require six or eight drive chain discs to complete the normal drive of the chain clamps, resulting in mechanical complexity, high manufacturing costs, and relatively low operating speeds. Although the overall performance of films stretched using the synchronous method is superior to that of films stretched using the two-step method, the synchronous film stretching technology is more suitable for low-volume, high-value-added, high-functionality film applications, such as lithium-ion battery separators. This limits the widespread application of synchronous film stretching technology in the field of biaxially oriented films. Summary of the Invention

[0004] Therefore, it is necessary to provide an ultra-high efficiency film mechanical synchronous stretching track and film production line that addresses at least one of the problems in the existing technology, which can simplify the structure and reduce costs.

[0005] On the one hand, this application provides an ultra-high efficiency film mechanical synchronous stretching track, comprising:

[0006] Chain clip;

[0007] A drive chain is provided, which is connected to the chain clamp and is used to drive the chain clamp to move. There are only two drive chain discs, which are a slow chain disc and a fast chain disc. The slow chain disc is used to be set on the inlet side of the high temperature oven, and the fast chain disc is set on the outlet side of the high temperature oven.

[0008] The chain clamp includes an inner rail and an outer rail, the outer rail being spaced apart from the inner rail and surrounding the inner rail; the chain clamp is used to support and guide the chain clamp, the chain clamp includes a working section and a return section, the working section and the return section are connected; the return section includes a recovery section, the distance between the inner rail and the outer rail of the recovery section increases along the return movement direction of the chain clamp.

[0009] In one embodiment, the annular guide rail further includes a first transition section and a second transition section; the first transition section is connected between the beginning of the recovery section and the working section, and the first transition section is correspondingly arranged with the slow-speed chain wheel; the distance between the inner rail and the outer rail of the first transition section is the maximum value;

[0010] The second transition section connects the end of the working section and the beginning of the return section, and the second transition section is correspondingly arranged with the fast chain conveyor; the distance between the inner rail and the outer rail of the second transition section is the minimum value.

[0011] In one embodiment, the distance between the inner and outer rails at the tail end of the recovery segment is equal to the distance between the inner and outer rails of the first transition segment; and / or, the distance between the inner and outer rails at the head end of the recovery segment is equal to the minimum value.

[0012] In one embodiment, the first transition segment includes a first arc segment and a tangent extension segment, the tangent extension segment being connected to and tangent to the first arc segment, and the tangent extension segment also being connected to the recovery segment.

[0013] In one embodiment, the ultra-high efficiency film mechanical synchronous stretching track further includes a force application mechanism; the recovery section includes an adjustment section, the distance between the inner rail and the outer rail of the adjustment section is adjustable; the force application mechanism is connected to the inner rail and / or the outer rail of the adjustment section, and the force application mechanism can provide a preload to the adjustment section so that the inner rail and the outer rail of the adjustment section tend to move closer to each other.

[0014] In one embodiment, the recovery section further includes a first connecting section and a second connecting section, wherein the first connecting section, the adjustment section, and the second connecting section are sequentially connected along the running direction of the chain clamp; the distance between the inner and outer rails of the first connecting section increases along the running direction, and the distance between the inner and outer rails of the second connecting section also increases along the running direction; the inner and outer rails of the adjustment section are arranged parallel to each other; one of the inner and outer rails of the adjustment section is provided with a telescopic pair and connected to the force application mechanism.

[0015] In one embodiment, the outer rail of the adjustment section is connected to the force application mechanism, the inner rail of the recovery section is set as a straight line, and the outer rail of the recovery section is set as a broken line;

[0016] The recovery section further includes a third transition section and a fourth transition section. The third transition section is connected between the first connecting section and the adjustment section, and the fourth transition section is connected between the adjustment section and the second connecting section.

[0017] In one embodiment, the ultra-high efficiency film mechanical synchronous stretching track further includes a guide mechanism and a track beam, the annular guide rail is disposed on the track beam, the guide mechanism is slidably disposed on the track beam, and at least one of the inner rail and the outer rail of the adjustment section is connected to the guide mechanism.

[0018] In one embodiment, the return section further includes a main return section, which is connected between the end of the recovery section and the working section; the distance between the inner and outer rails of the main return section remains constant along the running direction of the chain clamp.

[0019] The working section is used to enter the high-temperature oven from the inlet side and exit from the outlet side of the high-temperature oven; the return section is used to enter the high-temperature oven from the outlet side and exit from the stretching zone or preheating zone of the high-temperature oven, so that the return section penetrates the entire heat-setting zone of the high-temperature oven and is at least partially placed outside the preheating zone of the high-temperature oven.

[0020] On the other hand, this application also provides a film production line, including a high-temperature oven and two ultra-high-efficiency film mechanical synchronous stretching tracks; the two ultra-high-efficiency film mechanical synchronous stretching tracks are spaced apart and pass through the high-temperature oven.

[0021] Compared to related technologies where each film mechanical synchronous stretching track has three or four drive chain plates, the ultra-high efficiency film mechanical synchronous stretching track in this application only has two drive chain plates. This reduction in the number of drive chain plates leads to a corresponding reduction in the number of motors, gearboxes, and electrical control units, thus simplifying the structure and reducing costs. Furthermore, the cooperation of one slow-speed chain plate and one fast-speed chain plate still provides continuous power to the chain clamp, enabling the chain clamp to reciprocate cyclically along the annular guide rail. The chain clamp enters the high-temperature oven at low speed from the inlet side, clamping the film and driving it along the working section for various processes such as preheating, stretching, heat setting, and cooling within the high-temperature oven. It then returns at high speed via the return section, slowing down in the recovery section to return to the slow-speed chain plate at low speed and begin the next cycle. Attached Figure Description

[0022] Figure 1 This is a structural diagram of a thin film production line according to an embodiment of this application.

[0023] Figure 2 for Figure 1 Enlarged structural diagram at point A.

[0024] Figure 3 This is a structural diagram of the return flow section in a thin film production line according to an embodiment of this application.

[0025] Figure 4 This is a structural diagram of the annular guide rail and chain clamp in an ultra-high efficiency film mechanical synchronous stretching track according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. High-temperature oven; 11. Inlet side; 12. Outlet side; 13. Preheating zone; 14. Stretching zone; 15. Heat setting zone; 16. Cooling zone; 20. Ultra-high efficiency film mechanical synchronous stretching track; 21. Chain clamp; 211. First moving assembly; 212. Second moving assembly; 213. Linkage assembly; 214. Shaft crown; 22. Drive sprocket; 221. Slow-speed sprocket; 222. Fast-speed sprocket; 23. Circular guide rail; 2301. Inner rail; 2302. Outer rail; 231. Working section; 2311. Preheating section; 2312. 2313. Stretching section; 2314. Heat setting section; 2315. Cooling section; 2326. Return section; 2321. Recovery section; 23211. Adjustment section; 23212. First connecting section; 23213. Second connecting section; 23214. Telescopic pair; 2322. Main return section; 233. First transition section; 2331. First arc section; 2332. Tangential extension section; 234. Second transition section; 24. Force application mechanism; 25. Guide mechanism; 251. Support plate; 252. Slider; 26. Track beam; 261. Slide groove; 30. Membrane. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] As described in the background section, the synchronous film stretching production line in the related technology requires six or eight drive chains to complete the normal drive of the chain clamps, which is mechanically complex, has high manufacturing costs, and results in a relatively low operating speed of the film production line. In addition, the synchronous film stretching technology in the related technology is more suitable for low-capacity, high-value-added high-functionality film applications, such as lithium battery separators, which limits the widespread application of synchronous film stretching technology in the field of biaxially oriented films.

[0030] Based on this, this application provides an ultra-high efficiency film mechanical synchronous stretching track and film production line, which can simplify the structure, reduce costs, and improve operating speed.

[0031] It should be noted that in this embodiment, "lateral" refers to the width direction of the film, that is, as shown in the figure. Figure 1 The arrow Y in the diagram indicates the direction; the longitudinal direction refers to the length of the film, or the direction of movement of the film, i.e., as shown in the diagram. Figure 1 The direction indicated by the arrow X in the diagram.

[0032] The following will combine Figures 1 to 4 This paper provides a detailed description of the ultra-high efficiency film mechanical synchronous stretching track and film production line of this application.

[0033] Please see Figure 1 , Figure 1 A schematic diagram of a film production line according to an embodiment of this application is shown. An embodiment of this application provides a film production line including a high-temperature oven 10 and two ultra-high-efficiency film mechanical synchronous stretching tracks 20. The high-temperature oven 10 is provided with a preheating zone 13, a stretching zone 14, a heat-setting zone 15, and a cooling zone 16 arranged sequentially along the longitudinal direction of the film 30. The two ultra-high-efficiency film mechanical synchronous stretching tracks 20 are arranged side-by-side at intervals and cooperate with each other to clamp and pull the film 30 into the high-temperature oven 10, so that the film 30 undergoes various processes within the high-temperature oven 10. Specifically, the two ultra-high-efficiency film mechanical synchronous stretching tracks 20 clamp the film 30 on opposite sides in the transverse direction at the entrance side 11 of the high-temperature oven 10, and provide power to pull the film 30 into the high-temperature oven 10, where it undergoes various processes including but not limited to preheating, stretching, heat setting, and cooling. After the film 30 leaves the high-temperature oven 10 after processing, two ultra-high efficiency film mechanical synchronous stretching tracks 20 release the film 30 at the outlet side 12 of the high-temperature oven 10, and the film 30 continues to move backward to enter the next process.

[0034] Optionally, the two ultra-high-efficiency film mechanical synchronous stretching tracks 20 are arranged symmetrically. This can also be understood as the two ultra-high-efficiency film mechanical synchronous stretching tracks 20 having identical structures and shapes. Of course, in some optional solutions, the structures and shapes of the two ultra-high-efficiency film mechanical synchronous stretching tracks 20 do not need to be completely identical, as long as they can respectively pull the opposite sides of the film 30 and drive the film 30 along their respective annular tracks according to process requirements. No restrictions are imposed here, and all are within the scope of protection of this application.

[0035] Please see Figures 1 to 4 The following is a detailed description of an embodiment of the ultra-high efficiency film mechanical synchronous stretching track 20 provided in this application. For example, the ultra-high efficiency film mechanical synchronous stretching track 20 includes a chain clamp 21. The chain clamp 21 is used to clamp one side of the film 30 in the transverse direction. The chain clamps 21 of two ultra-high efficiency film mechanical synchronous stretching tracks 20 are respectively used to clamp opposite sides of the film 30 in the transverse direction.

[0036] For example, the ultra-high efficiency film mechanical synchronous stretching track 20 also includes a drive chain 22. The drive chain 22 is connected to the chain clamp 21 and is used to drive the movement of the chain clamp 21. There are only two drive chain 22s, namely a slow chain 221 and a fast chain 222. The slow chain 221 is set on the inlet side 11 of the high-temperature oven 10, and the fast chain 222 is set on the outlet side 12 of the high-temperature oven 10.

[0037] Among them, the fast chainring 222 operates at a higher speed and has a larger tooth pitch; the slow chainring 221 operates at a lower speed and has a smaller tooth pitch. The speed of the fast chainring 222 is higher than the rotational speed of the slow chainring 221.

[0038] Please see Figure 1 For example, the ultra-high efficiency film mechanical synchronous stretching track 20 also includes annular guide rails 23. The annular guide rails 23 are used to support and guide the chain clamps 21. Each annular guide rail 23 can be specifically divided into an inner rail 2301 and an outer rail 2302. Both the inner rail 2301 and the outer rail 2302 are annular. The inner rail 2301 and the outer rail 2302 are spaced apart, with the outer rail 2302 surrounding the inner rail 2301.

[0039] The annular guide rail 23 includes a working section 231 and a return section 232, with the working section 231 and the return section 232 connected together. Optionally, the working section 231 includes a preheating section 2311, a stretching section 2312, a heat-setting section 2313, and a cooling section 2314 connected in sequence. The preheating section 2311 passes through the preheating zone 13 of the high-temperature oven 10, the stretching section 2312 passes through the stretching zone 14 of the high-temperature oven 10, the heat-setting section 2313 passes through the heat-setting zone 15 of the high-temperature oven 10, and the cooling section 2314 passes through the cooling zone 16 of the high-temperature oven 10. The spacing W1 of the preheating sections 2311 of the two annular guide rails 23 remains constant or essentially constant along the running direction of the film 30, with the deviation controlled within ±5%; the spacing W2 of the stretching sections 2312 of the two annular guide rails 23 shows an increasing trend along the running direction of the film 30; the spacing W3 of the heat setting sections 2313 of the two annular guide rails 23 remains constant or essentially constant along the running direction of the film 30, with the deviation controlled within ±5%; the spacing W4 of the cooling sections 2314 of the two annular guide rails 23 remains constant or essentially constant along the running direction of the film 30, with the deviation controlled within ±5%.

[0040] The chain clamp 21 is driven by the slow-speed chain disc 221 and enters the working section 231, that is, it enters the high-temperature oven 10 from the inlet side 11. During its operation along the working section 231, the chain clamp 21 holds the film 30 and drives the film 30 to undergo various processes such as preheating, stretching, heat setting, and cooling. The chain clamp 21 releases the film 30 and enters the return section 232 from the working section 231. Under the driving force provided by the fast chain disc 222, the chain clamp 21 moves at high speed along the return section 232 and returns at low speed to the slow-speed chain disc 221. The slow-speed chain disc 221 drives the returning chain clamp 21 to enter the high-temperature oven 10 at low speed and enter the next cycle. At this time, the distance between adjacent clamps of the chain clamp 21 is at its minimum value.

[0041] For example, the return section 232 includes a recovery section 2321. The distance between the inner rail 2301 and the outer rail 2302 of the recovery section 2321 tends to increase along the return movement direction of the chain clamp 21. When the chain clamp 21 moves to the recovery section 2321, the distance between the adjacent clamps of the chain clamp 21 gradually decreases, and the movement speed of the chain clamp 21 gradually decreases, so that the adjacent clamps of the chain clamp 21 enter the slow-speed chain disk 221 in a close-fitting posture and at a low speed.

[0042] Compared to the three or four drive chain discs in each film mechanical synchronous stretching track in related technologies, the ultra-high efficiency film mechanical synchronous stretching track 20 in this application has only two drive chain discs 22. Thus, the film production line only needs four drive chain discs 22. It can be seen that the number of drive chain discs 22 is reduced, and consequently the number of motors, gearboxes and electrical control units is reduced accordingly, thereby simplifying the structure and reducing costs.

[0043] It is understandable that the chain clamp 21 can adopt any of the disclosed technologies, as long as it can achieve the goal of adjusting the spacing of adjacent clamps according to the distance between the inner rail 2301 and the outer rail 2302 of the annular guide rail 23 when running on the annular guide rail 23. For an example, please refer to [link to example]. Figure 4The chain clamp 21 includes a first moving component 211, a second moving component 212, and a link assembly 213. There are multiple first moving components 211 and multiple second moving components 212. Multiple first moving components 211 are movably mounted sequentially on the inner rail 2301, and multiple second moving components 212 are movably mounted sequentially on the outer rail 2302. The first moving components 211 and second moving components 212 are alternately arranged. Each first moving component 211 includes a first body, and each second moving component 212 includes a second body and a clamp mounted on the second body. Multiple link assemblies 213 are arranged correspondingly between adjacent first moving components 211 and second moving components 212. One end of each link assembly 213 is rotatably connected to the first body, and the other end is rotatably connected to the second body. Each of the first and second bodies has a shaft crown 214. The drive sprocket 22 has toothed grooves. The shaft crown 214 cooperates with the tooth groove. When the drive chain 22 rotates, it drives the shaft crown 214 to move, thereby driving the chain clamp 21 to move along the annular guide rail 23.

[0044] Please see Figure 1 and Figure 2 For example, the annular guide rail 23 further includes a first transition section 233. The first transition section 233 acts as a bridge between the beginning of the recovery section 2321 and the working section 231, connecting the beginning of the recovery section 2321 and the working section 231, allowing the recovery section 2321 to transition to the beginning of the working section 231. The recovery section 2321 is located at the end of the return section 232, and the chain clamp 21 of the return section 232 is output from the recovery section 2321 to the first transition section 233. The first transition section 233 is correspondingly arranged with the slow-speed chain disc 221. Optionally, the first transition section 233 includes a first arc-shaped section 2331. Driven by the slow-speed chain disc 221, the chain clamp 21 adjusts its direction and smoothly runs to the working section 231 when it moves along the first arc-shaped section 2331. The distance between the inner rail 2301 and the outer rail 2302 of the first transition section 233 is at its maximum value. Furthermore, the distance between the inner rail 2301 and the outer rail 2302 of the first transition section 233 remains unchanged along the running direction of the chain clamp 21. That is, the distance between adjacent clamps of the chain clamp 21 when it runs in the first transition section 233 will be at its minimum value, moving closely along the first transition section 233. In this way, when the slow-speed chain disc 221 engages with the chain clamp 21 running on the first transition section 233, there will be no skipped tooth defect. In order to further optimize the running stability, the distance between the inner rail 2301 and the outer rail 2302 at the end of the recovery section 2321 is equal to the distance between the inner rail 2301 and the outer rail 2302 of the first transition section 233, that is, both are at their maximum values, so that before the chain clamp 21 is driven by the slow-speed chain disc 221, the adjacent clamps of the chain clamp 21 are in a close-to-close state.

[0045] Please see Figure 1 and Figure 2 Based on the aforementioned embodiments, the first transition section 233 further includes a tangent extension section 2332. The tangent extension section 2332 connects the first arc-shaped section 2331 and the recovery section 2321. The tangent extension section 2332 is tangent to the first arc-shaped section 2331. Specifically, the inner rail 2301 of the tangent extension section 2332 is tangent to the inner rail 2301 of the first arc-shaped section 2331, and the outer rail 2302 of the tangent extension section 2332 is tangent to the outer rail 2302 of the first arc-shaped section 2331. Thus, due to the presence of the tangent extension section 2332, the chain clamp 21 on the recovery section 2321 can move smoothly to the first arc-shaped section 2331.

[0046] For example, the annular guide rail 23 also includes a second transition section 234. The second transition section 234 acts as a bridge between the tail end of the working section 231 and the head end of the return section 232, connecting the tail end of the working section 231 and the head end of the return section 232, allowing the tail end of the working section 231 to transition to the head end of the return section 232. The second transition section 234 is correspondingly arranged with the fast sprocket 222. The second transition section 234 is, for example, arc-shaped. Driven by the fast sprocket 222, the chain clamp 21 adjusts its direction and smoothly runs to the return section 232 as it moves along the second transition section 234. The distance between the inner rail 2301 and the outer rail 2302 of the second transition section 234 is at its minimum. Furthermore, the distance between the inner rail 2301 and the outer rail 2302 of the second transition section 234 remains constant along the running direction of the chain clamp 21. That is, when the chain clamp 21 is running in the second transition section 234, the spacing between adjacent clamps will be at its maximum value, and the chain clamp 21 will move at high speed to the return section 232 under the drive of the fast chain disc 222. Furthermore, before being driven by the fast chain disc 222, the adjacent clamps of the chain clamp 21 will be at their maximum value.

[0047] Based on the aforementioned embodiment, the distance between the inner rail 2301 and the outer rail 2302 at the beginning of the recovery section 2321 is equal to the minimum distance between the inner rail 2301 and the outer rail 2302 in the annular guide rail 23. That is, the distance between the inner rail 2301 and the outer rail 2302 at the beginning of the recovery section 2321 is at its minimum. The chain clamp 21 on the return section 232 enters the beginning of the recovery section 2321 at high speed.

[0048] It should be noted that the "starting end" and "ending end" of working section 231 are both referenced to the running direction of chain clamp 21. Taking the inlet side 11 of the high-temperature oven 10 as the starting point, the end of chain clamp 21 that first enters according to its running direction is the "starting end." In other words, the end of working section 231 located at the inlet side 11 of the high-temperature oven 10 is also the "starting end" of working section 231, and the other end of working section 231 is the "ending end." Similarly, the end of return section 232 located at the outlet side 12 of the high-temperature oven 10 is also the "starting end" of return section 232, and the other end of return section 232 is the "ending end" of return section 232. The "ending end" of recovery section 2321 is also the "ending end" of return section 232, and the other end of recovery section 2321 is also the "starting end" of recovery section 2321.

[0049] Understandably, to avoid serious mechanical failures such as skipped teeth, the adjacent clamps of the chain clamp 21 must be in a stable, close-fitting state before entering the slow-speed chain 221. Only when the distance between two adjacent shaft crowns 214 of the chain clamp 21 in its folded state matches the adjacent tooth pitch of the slow-speed chain 221 can it be reliably driven. In practical applications, if the fast chain 214 located at the inlet side of the high-temperature oven in related technologies is directly omitted, it means that the fast chain 214 will be unable to apply pressure to the passing chain clamps along their direction of movement. Consequently, when the chain clamp moves to the slow-speed chain 221, the adjacent clamps of the chain clamp cannot be in a stable, close-fitting state. If the position of the shaft crown about to be driven by the chain teeth lags behind, it will lead to serious mechanical failures such as skipped teeth.

[0050] Please see Figures 1 to 3Based on this, to avoid skipped teeth defects caused by omitting the fast chain 222 of the inlet side 11 of the high-temperature oven 10, in some embodiments, the ultra-high efficiency film mechanical synchronous stretching track 20 in this embodiment also includes a force application mechanism 24. The recovery section 2321 includes an adjustment section 23211. It is worth noting that the recovery section 2321 can be entirely the adjustment section 23211, or a portion thereof can be designated as the adjustment section 23211; this is not limited here. The distance between the inner rail 2301 and the outer rail 2302 of the adjustment section 23211 is adjustable. The force application mechanism 24 is connected to at least one of the inner rail 2301 and the outer rail 2302 of the adjustment section 23211. The force application mechanism 24 can provide a preload to the adjustment section 23211, so that the inner rail 2301 and the outer rail 2302 of the adjustment section 23211 tend to move closer to each other. Thus, by applying a preload force to the adjusting section 23211 through the force-applying mechanism 24, the inner rail 2301 and the outer rail 2302 of the adjusting section 23211 tend to move closer to each other, thereby causing the chain clamp 21 to tend to expand outward along its longitudinal direction. Furthermore, the distance between the fast chain disc 222 and the slow chain disc 221 remains unchanged, and the total length of the chain clamp 21 remains constant. Therefore, under the preload force provided by the force-applying mechanism 24, the chain clamp 21 on the return section 232 will always be in a state of approximately "compression spring" stress during operation. Furthermore, dynamic correction can be performed on the chain clamp 21 that is about to be driven by the chain teeth but is lagging in position, ensuring the accuracy of tooth engagement and effectively preventing skipped teeth defects. This eliminates the need for the fast chain disc 222 located on the inlet side 11 of the high-temperature oven 10 in related technologies.

[0051] Since the spacing of the adjustment section 23211 can be adjusted according to requirements, the recovery section 2321 also has a compensation function, that is, it can be used as a compensation section. When the stretching ratio of the film 30 is set by adjusting the distance between the inner rail 2301 and the outer rail 2302 of the stretching section 2312, the distance between the inner and outer rails 2302 at the compensation section can be adjusted accordingly to adaptively compensate for the excess chain clamp 21, thereby ensuring that the length of the entire chain clamp 21 matches that of the guide rail.

[0052] For example, the force-applying mechanism 24 may include, but is not limited to, any one or more combinations of cylinders, spring-operated mechanisms, motor lead screws, and magnetic mechanisms, as long as it can provide preload to the adjusting section 23211, causing the inner rail 2301 and outer rail 2302 of the adjusting section 23211 to tend to move closer to each other. The magnitude of the preload can be flexibly adjusted according to actual needs, ensuring that the adjacent clamps of the chain clamp 21 are in a close contact state before entering the slow-speed chain disc 221; no restrictions are imposed here.

[0053] It should be noted that the inner rail 2301 and outer rail 2302 of the recovery section 2321 can have various design forms, such as one or any combination of straight lines, curves, broken lines, etc., as long as the distance between them increases in the direction of return movement along the chain clamp 21. The specific shape can be flexibly adjusted and set according to actual needs, and there are no restrictions here.

[0054] In one specific embodiment, the position of the inner rail 2301 of the adjusting section 23211 remains stationary, and the force-applying mechanism 24 is specifically connected to the outer rail 2302 of the adjusting section 23211. The force-applying mechanism 24 applies a preload to the outer rail 2302 of the adjusting section 23211, causing the outer rail 2302 of the adjusting section 23211 to move toward the inner rail 2301 of the adjusting section 23211.

[0055] Please see Figures 1 to 3 Based on the aforementioned embodiment, the recovery section 2321 further includes a first connecting section 23212 and a second connecting section 23213. The first connecting section 23212, the adjusting section 23211, and the second connecting section 23213 are sequentially connected along the running direction of the chain clamp 21. The distance D1 between the inner rail 2301 and the outer rail 2302 of the first connecting section 23212 increases along the running direction, and the distance D3 between the inner rail 2301 and the outer rail 2302 of the second connecting section 23213 also increases along the running direction. The inner rail 2301 and the outer rail 2302 of the adjusting section 23211 are arranged parallel to each other, i.e., the distance D2 remains constant. The outer rail 2302 of the adjusting section 23211 is provided with a telescopic pair 23214. Thus, when the force-applying mechanism 24 drives the outer rail 2302 of the adjusting section 23211 to move, the telescopic pair 23214 can adaptively extend and retract to adjust its length, and the outer rail 2302 of the adjusting section 23211 is easier to move. In addition, the first connecting section 23212 and the second connecting section 23213 can still perform their restoring functions.

[0056] Specifically, the telescopic pair 23214 includes a first splicing segment and a second splicing segment that can extend and retract longitudinally relative to each other. The first splicing segment and the second splicing segment are nested together, for example, using a male and female connector configuration. When the outer rail 2302 of the adjusting segment 23211 moves towards the inner rail 2301, the telescopic pair 23214 can adaptively extend and retract to adjust the length of the outer rail 2302 of the adjusting segment 23211 to accommodate the angular offset of the outer rails 2302 of the first connecting segment 23212 and the second connecting segment 23213. This ensures smooth displacement adjustment of the outer rail 2302 of the adjusting segment 23211 and avoids the defect of jamming and inability to adjust.

[0057] For example, the outer rail 2302 of the adjusting section 23211 is connected to the force-applying mechanism 24, the inner rail 2301 of the restoring section 2321 is set as a straight line, and the outer rail 2302 of the restoring section 2321 is set as a broken line. Specifically, the outer rail 2302 of the first connecting section 23212 is set at an angle to the outer rail 2302 of the adjusting section 23211, and the outer rail 2302 of the second connecting section 23213 is set at an angle to the outer rail 2302 of the adjusting section 23211.

[0058] For example, the recovery section 2321 further includes a third transition section and a fourth transition section. Each of the third and fourth transition sections is, but is not limited to, an arc-shaped transition section. The third transition section connects the first connecting section 23212 and the adjusting section 23211, and the fourth transition section connects the adjusting section 23211 and the second connecting section 23213. Thus, under the action of the third transition section, the chain clamp 21 of the first connecting section 23212 smoothly moves to the adjusting section 23211. Under the action of the fourth transition section, the chain clamp 21 of the adjusting section 23211 smoothly moves to the second connecting section 23213.

[0059] Based on the aforementioned embodiments, the ultra-high efficiency film mechanical synchronous stretching track 20 further includes a guide mechanism 25 and a track beam 26. An annular guide rail 23 is disposed on the track beam 26, and the guide mechanism 25 is slidably disposed on the track beam 26. The track beam 26 provides stable support for the annular guide rail 23 and the guide mechanism 25. At least one of the inner rail 2301 and the outer rail 2302 of the adjusting section 23211 is connected to the guide mechanism 25. Specifically, the outer rail 2302 of the adjusting section 23211 is connected to the guide mechanism 25. When the force-applying mechanism 24 drives the outer rail 2302 of the adjusting section 23211 to move, the guide mechanism 25 provides guidance, thereby improving operational stability.

[0060] Optionally, the track beam 26 is provided with a groove 261. The guide mechanism 25 includes a support plate 251 and a slider 252. The slider 252 is connected to the support plate 251 and is slidably disposed in the groove 261. The slider 252 and the groove 261 may be one, two, or more in number, for example, and are not limited herein. The outer rail 2302 of the adjusting section 23211 is connected to the support plate 251. The force-applying mechanism 24 is connected to the support plate 251. The force-applying mechanism 24 drives the support plate 251 to move, and under the guidance of the guide mechanism 25, the support plate 251 stably drives the outer rail 2302 of the adjusting section 23211 to move relative to the inner rail 2301. The direction of movement of the outer rail 2302 is as follows: Figure 3 As shown in F in the diagram.

[0061] For example, the return section 232 also includes a main return section 2322. The main return section 2322 is the area outside the recovery section 2321 on the return section 232. The main return section 2322 connects the recovery section 2321 and the tail end of the working section 231. The distance between the inner rail 2301 and the outer rail 2302 of the main return section 2322 remains constant along the running direction of the chain clamp 21. The distance between the inner rail 2301 and the outer rail 2302 of the main return section 2322 is the minimum distance between the inner rail 2301 and the outer rail 2302 in the annular guide rail 23.

[0062] Therefore, the main return section 2322 does not need to be designed with functional sections. It is mainly used for the high-speed return of the chain clamp 21. It can separate the adjacent clamps of the chain clamp 21 to the greatest extent, effectively reduce the number of chain clamps per unit length, reduce investment costs, and the force characteristics formed by the mechanism are more conducive to the transmission of thrust in the running direction and reduce the consumption of frictional resistance.

[0063] Please see Figure 1 For example, the return section 232 enters the high-temperature oven 10 from the outlet side 12 and exits outward from the stretching zone 14 or preheating zone 13 of the high-temperature oven 10, such that the return section 232 passes through the entire heat setting zone 15 of the high-temperature oven 10 and is at least partially external to the preheating zone 13 of the high-temperature oven 10. Thus, on the one hand, at least a portion of the return section 232 passes through the high-temperature oven 10. The area of ​​the return section 232 passing through the high-temperature oven 10 and the working section 231 passing through the high-temperature oven 10 can share a support beam, eliminating the need for a separate support beam, simplifying the structure and reducing the cost of the device. Furthermore, compared to the fully external arrangement of the return section 232 in related technologies, this application can shorten the path length of the return section 232, thereby shortening the length of the chain clamp 21 and reducing the cost of the device. On the other hand, the return section 232 passes out of the high-temperature oven 10 from the stretching area 14, meaning that at least a portion of the return section 232 is external to the high-temperature oven 10. The temperature of the area of ​​the return section 232 external to the high-temperature oven 10 is less affected by the high-temperature oven 10, and the chain clamp 21 is better cooled. When the chain clamp 21 returns to the working section 231 after the temperature drops, it has little impact on the film 30, thus avoiding film breakage defects.

[0064] In order to minimize the volume of the high-temperature oven 10 and increase the cooling time of the chain clamp 21 before returning to the inlet side 11 of the high-temperature oven 10, the return section 232 in this embodiment preferably extends outward from the stretching zone 14 of the high-temperature oven 10, so that the return section 232 is completely outside the preheating zone 13 of the high-temperature oven 10. That is, the return section 232 does not penetrate into the preheating zone 13 of the high-temperature oven 10, and returns directly to the inlet side 11 of the high-temperature oven 10 from the outside after exiting the stretching zone 14. After the chain clamp 21 rotates through the fast chain 222, it is in the return stage, and then returns into the high-temperature oven 10 and passes through at least a portion of the maximum width heat setting section 2313 and the stretching zone 14. The return section 232 exits the high-temperature oven 10 from the stretching zone 14 and is placed outside the minimum width preheating zone 13. The distance between the return section 232 and the stretching section 2312 gradually increases along the return direction of the chain clamp 21, making the negative impact of the high-temperature chain clamp 21 on the temperature field accuracy of the film 30 held by the stretching section 2312 when it reaches the stretching zone 14 negligible. Furthermore, the portion of the return section 232 outside the high-temperature oven 10 is relatively long, allowing for extended cooling time, which facilitates the cooling effect of the high-temperature chain clamp 21 and enables precise control of the cooling temperature.

[0065] In order to facilitate the return section 232 to exit outward from the stretching zone 14 of the high-temperature oven 10, based on the aforementioned embodiment, please refer to... Figure 1 The high-temperature oven 10 is arranged in a stepped shape on both sides of the transverse direction, corresponding to the preheating zone 13 and the stretching zone 14. Specifically, the spacing between the two sides of the high-temperature oven 10 increases in a stepped manner along the running direction of the film 30. In this way, on the one hand, the return section 232 can extend outward from the stretching zone 14 of the high-temperature oven 10 and be placed outside the preheating zone 13; on the other hand, the volume of the high-temperature oven 10 can be reduced. Furthermore, the position where the return section 232 extends outward from the stretching zone 14 of the high-temperature oven 10 is at a certain distance from the film 30 in the transverse direction, so the cold air outside the high-temperature oven 10 has little impact on the quality of the film 30 in the stretching zone 14.

[0066] For example, at least a portion of the return section 232 passing through the high-temperature oven 10 is parallel to the longitudinal direction of the high-temperature oven 10. Furthermore, the portion of the return section 232 passing through the high-temperature oven 10 is arranged close to the inner wall of the high-temperature oven 10. That is, the portion of the return section 232 passing through the high-temperature oven 10 is relatively far from the high-temperature chain clamp 21 and the film 30 running on the working section 231. Thus, the high-temperature chain clamp 21 running on the return section 232 has a smaller impact on the temperature field of the film 30 due to the larger distance between it and the film 30, thereby ensuring the production quality of the film 30.

[0067] Based on the aforementioned embodiments, the return segment 232 may include, but is not limited to, any one or more combinations of straight lines, broken lines, curves, etc.

[0068] In the related technologies, the return section 232 is externally mounted, returning from the outlet side 12 of the high-temperature oven 10 along the outer wall of the oven 10 to the inlet side 11. The return section 232 is roughly C-shaped with a relatively long path. In the related technologies, the return section 232 is internally mounted, typically adapting to the shape of the working section 231 to return to the inlet side 11 of the high-temperature oven 10. The return section 232 is roughly Z-shaped with a relatively long path. Furthermore, the close proximity of the return section 232 to the working section 231 can affect the temperature field of the film 30, thus impacting the product quality. Therefore, in some embodiments, the return section 232 is specifically designed as a straight line. When the return section 232 is designed as a straight line, on the one hand, the path length is shorter, reducing the number of chain clamps 21, and consequently reducing the supporting and driving loads, thereby lowering costs. On the other hand, from a mechanical point of view, the force transmission effect of the chain clamp 21 will be more obvious when the fast chain 222 is in operation.

[0069] It should be noted that the "straight line" in this application is not a strictly mathematical "straight line", but rather one that can be judged as a "straight line" by the naked eye, and deviations from the theoretical "straight line" are allowed.

[0070] The horizontal distance between the centerline of the fast-speed chain conveyor 222 and the high-temperature oven 10 is greater than the horizontal distance between the centerline of the slow-speed chain conveyor 221 and the high-temperature oven 10. Therefore, the return segment 232 can optionally be a zigzag shape. Furthermore, the included angle between two adjacent segments in the zigzag shape is an obtuse angle, specifically, for example, 150° to 175°. That is, the return section 232 is close to a "straight line". Compared with the fully external or fully internal return section 232 in related technologies, the length of the return section 232 is smaller, which reduces the cost and the chain clamp 21 has a better force transmission effect. At the same time, compared with setting it as a straight line, the design of the broken line return section 232 is more flexible. It can be extended from the fast chain plate 222 to the slow chain plate 221 according to actual needs. It can also make reasonable and full use of the internal space of the high temperature oven 10, and can make the return section 232 as far away from the working section 231 and the film 30 as possible. The influence of the high temperature chain clamp 21 running along the return section 232 on the temperature field of the film 30 is reduced.

[0071] In summary, the aforementioned ultra-high efficiency film mechanical synchronous stretching track 20 and film production line have at least the following advantages:

[0072] While ensuring that the functions of all equipment remain unchanged, the number of drive chain discs 22 of each ultra-high efficiency film mechanical synchronous stretching track 20 is reduced to a minimum, which simplifies the structure and reduces costs. A force application mechanism 24 is set in the recovery section 2321, which provides pre-tightening to prevent tooth skipping defects. Furthermore, the compensation function can be integrated into the recovery section 2321, which significantly reduces the path and number of chain clamps 21 in the return section 232, greatly reducing the investment cost, operating cost, and maintenance cost of the equipment, and greatly increasing its operating efficiency, thus promoting the advancement of film production lines.

[0073] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0074] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0076] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0077] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A super high performance thin film mechanical synchronous stretching track, characterized in that, The chain clamp is driven by two driving chain discs, a slow chain disc and a fast chain disc, the slow chain disc is arranged at the entrance side of the high-temperature oven, and the fast chain disc is arranged at the exit side of the high-temperature oven. The ring-shaped guide rail is provided with an inner rail and an outer rail, the outer rail is arranged outside the inner rail and is spaced from the inner rail, the ring-shaped guide rail is used for supporting and guiding the chain clamp, and the ring-shaped guide rail comprises a working section and a return section, the working section and the return section are connected, the return section comprises a recovery section, and the distance between the inner rail and the outer rail of the recovery section presents an increasing trend in the return movement direction of the chain clamp. The ultra-high-efficiency thin-film mechanical synchronous stretching track further comprises a force applying mechanism, the recovery section comprises an adjusting section, the distance between the inner rail and the outer rail of the adjusting section is adjustable, the force applying mechanism is connected with the inner rail and / or the outer rail of the adjusting section, the force applying mechanism can provide a pre-tightening force for the adjusting section, so that the inner rail and the outer rail of the adjusting section have a mutual approaching trend. The ring-shaped guide rail further comprises a first transition section and a second transition section, the first transition section is connected between the recovery section and the first end of the working section, the first transition section is arranged corresponding to the slow chain disc, the distance between the inner rail and the outer rail of the first transition section is the maximum value. The second transition section is connected between the tail end of the working section and the head end of the return section, the second transition section is arranged corresponding to the fast chain disc, and the distance between the inner rail and the outer rail of the second transition section is the minimum value.

2. The ultra-high performance thin film mechanical synchronous stretching track according to claim 1, wherein, The distance between the inner rail and the outer rail of the tail end of the recovery section is equal to the distance between the inner rail and the outer rail of the first transition section, and / or the distance between the inner rail and the outer rail of the head end of the recovery section is equal to the minimum value. The first transition section comprises a first arc-shaped section and a tangent extension section, the tangent extension section is connected with and tangent to the first arc-shaped section, and the tangent extension section is further connected with the recovery section.

3. The ultra-high performance thin film mechanical synchronous stretching track according to claim 2, wherein, The recovery section further comprises a first connecting section and a second connecting section, the first connecting section, the adjusting section and the second connecting section are sequentially arranged in the running direction of the chain clamp, the distance between the inner rail and the outer rail of the first connecting section presents an increasing trend in the running direction, the distance between the inner rail and the outer rail of the second connecting section presents an increasing trend in the running direction, the inner rail and the outer rail of the adjusting section are arranged in parallel with each other, and one of the inner rail and the outer rail of the adjusting section is provided with an extension pair and is connected with the force applying mechanism.

4. The ultra-high performance thin film mechanical synchronous stretching track of claim 2, wherein, The outer rail of the adjusting section is connected with the force applying mechanism, the inner rail of the recovery section is arranged in a straight line, and the outer rail of the recovery section is arranged in a broken line.

5. The ultra-high performance thin film mechanical synchronous stretching track of claim 1, wherein, The recovery section further comprises a third transition section and a fourth transition section, the third transition section is connected between the first connecting section and the adjusting section, and the fourth transition section is connected between the adjusting section and the second connecting section.

6. The ultra-high performance thin film mechanical synchronous stretching track of claim 5, wherein, ​ ​ 7. The ultra-high performance thin film mechanical synchronous stretching track of claim 1, wherein, The ultra-high performance film mechanical synchronous stretching track further comprises a guide mechanism and a track beam, the annular guide track is arranged on the track beam, the guide mechanism is slidably arranged on the track beam, and at least one of the inner side track and the outer side track of the adjusting section is connected with the guide mechanism.

8. The ultra-high performance thin film mechanical synchronous stretching track of claim 1, wherein, The return section further comprises a main return section connected between the recovery section and the tail end of the working section; the distance between the inner side track and the outer side track of the main return section remains unchanged along the running direction of the chain clip.

9. The ultra-high performance thin film mechanical synchronous stretching track of claim 1, wherein, The working section is used to enter the high-temperature oven from the inlet side of the high-temperature oven and exit from the outlet side of the high-temperature oven; the return section is used to enter the high-temperature oven from the outlet side of the high-temperature oven and exit from the stretching zone or the preheating zone of the high-temperature oven, so that the return section penetrates through the entire heat setting zone of the high-temperature oven and is at least partially arranged outside the preheating zone of the high-temperature oven.

10. A film production line characterized by, The high-temperature oven and two ultra-high performance film mechanical synchronous stretching tracks according to any one of claims 1 to 9 are comprised; the two ultra-high performance film mechanical synchronous stretching tracks are arranged at intervals and are arranged in the high-temperature oven.

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