Bidirectional stretching and shaping device for film production

Abstract

The invention relates to the technical field of film stretching, in particular to a two-way stretching and shaping device for film production, which comprises two stretching mechanisms arranged on the upper side and the lower side of a film moving path, and each stretching mechanism comprises a circulating conveying belt and a plurality of stretching units. The stretching unit comprises a stretching frame, two multi-point stretching structures, a stretching driving structure and a lifting structure; the two multi-point stretching structures are arranged at the two ends of the stretching frame correspondingly, each multi-point stretching structure comprises a plurality of clamping plates, the clamping plates are slidably connected with the stretching frame, and two first springs are arranged between every two adjacent clamping plates; the stretching driving structure is arranged on one side of the stretching frame, and the stretching driving structure is connected with the two multi-point stretching structures; the lifting structure is arranged between the circulating conveying belt and the stretching frame; the stretching frame, the two multi-point stretching structures, the stretching driving structure and the lifting structure are arranged, so that a film is uniformly stretched at multiple positions, and the problem that the film is thin in the middle and thick on the two sides is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of film stretching, in particular to a biaxial stretching shaping device for film production. Background Art

[0002] Film is an important polymer material, which is widely used in packaging, electronics, insulation materials, decorative materials and other fields due to its excellent physical properties, chemical stability and processing performance. In the production process of film, biaxial stretching is a crucial process link, which can improve the physical properties of the film.

[0003] The patent with announcement number CN118358154B discloses a PP film biaxial stretching forming equipment, including a film feeding device, the film feeding device includes a feeding rack, the film feeding device is used to feed the PP film to be stretched, a film collecting device is arranged next to the film feeding device, the film collecting device includes a film rolling rack, the film collecting device is used to rewind the stretched film, two stretching devices are symmetrically arranged next to the film feeding device, the stretching device includes a circulating bottom frame, the stretching device is used to biaxially stretch the PP film, and multiple clamping mechanisms in the stretching device clamp the edges of the film. As the circulation process proceeds, the film is biaxially stretched.

[0004] Although the above scheme stretches the film on both sides of the film's moving path, the multiple clamping mechanisms in the on-duty stretching device are all clamped on the edge of the film, and the film is actually stretched between the two opposite clamping mechanisms during stretching. When the width of the film is narrow, the film between the two clamping mechanisms is subjected to more uniform force, and the film can be stretched uniformly. However, when the width of the film is wider, the film between the two clamping mechanisms has a larger area, and the force may be different at different places, resulting in the problem of being thin in the middle and thick on both sides after stretching. Summary of the invention

[0005] In view of the above problems, a biaxial stretching and shaping device for film production is provided. By setting a stretching frame, two multi-point stretching structures, a stretching drive structure and a lifting structure, uniform stretching of the film at multiple positions can be achieved, effectively avoiding the problem of the film being thin in the middle and thick on both sides.

[0006] In order to solve the problems of the prior art, the present invention provides a biaxial stretching and shaping device for film production, comprising two stretching mechanisms arranged on the upper and lower sides of a film moving path, the stretching mechanism comprising a circulating conveyor belt and a plurality of stretching units, the plurality of stretching units being arranged on the circulating conveyor belt at equal intervals, the stretching units comprising a stretching frame, two multi-point stretching structures, a stretching driving structure and a lifting structure; the stretching frame is divided into a first part and a second part; the two multi-point stretching structures are respectively arranged on the first part and the second part of the stretching frame, the multi-point stretching structure comprising a plurality of clamping plates, the plurality of clamping plates being arranged parallel to each other, the clamping plates being slidably connected to the stretching frame, and two first springs being arranged between two adjacent clamping plates, the two ends of the first springs being respectively abutted against the two clamping plates; the stretching driving structure is arranged on one side of the stretching frame, the stretching driving structure being connected to the two multi-point stretching structures; the lifting structure is arranged between the circulating conveyor belt and the stretching frame.

[0007] Preferably, the stretching unit further comprises two first guide structures, the two first guide structures are respectively arranged on both sides of the stretching frame, and the two ends of the clamping plate are respectively connected to the two first guide structures.

[0008] Preferably, the stretching drive structure includes a drive frame, two drive units, an adjustment structure and a first drive structure; the drive frame is arranged in parallel on one side of the stretching frame; the two drive units are respectively arranged at two ends of the drive frame, the drive unit includes a drive block, a connecting frame and a drive rod, the drive block is connected to the drive frame, the drive block is provided with an inclined surface on the side facing the stretching frame, the connecting frame is slidably connected to the first guide structure, the two ends of the drive rod are connected to the connecting frame, and the middle part of the drive rod is slidably connected to the inclined surface of the drive block; the adjustment structure is arranged in the middle part of the drive frame, and the adjustment structure is connected to the two drive units; the first drive structure is arranged on one side of the drive frame, and the first drive structure is connected to the drive frame.

[0009] Preferably, an inclined groove is provided on the driving block, the driving rod is arranged in the inclined groove, and the driving rod abuts against the groove wall of the inclined groove.

[0010] Preferably, the adjustment structure includes two second guide structures and an adjustment assembly; the two second guide structures are respectively arranged at both ends of the drive frame, and the two drive units are connected to the two second guide structures; the adjustment assembly is arranged between the two second guide structures, and the adjustment assembly is connected to the two second guide structures.

[0011] Preferably, the first driving structure includes two driving components and a first synchronous transmission structure; the two driving components are respectively arranged on both sides of the driving frame, and the two driving components are connected to both sides of the driving frame; the synchronous transmission structure is arranged at the same end of the two driving components, and the synchronous transmission structure is connected to the two driving components.

[0012] Preferably, the lifting structure includes a connecting plate, a U-shaped frame and a second driving structure; the connecting plate is parallel to the stretching frame, and the connecting plate is connected to the circulating conveyor belt; the two ends of the U-shaped frame are connected to the two ends of the stretching frame, and the middle part of the U-shaped frame is parallel to the connecting plate; the second driving structure is arranged between the connecting plate and the U-shaped frame, and the second driving structure is connected to the connecting plate and the U-shaped frame.

[0013] Preferably, the second driving structure has the same structure as the first driving structure.

[0014] Preferably, the lifting structure also includes two third guide structures, which are respectively arranged at both ends of the connecting plate, and the third guide structure includes a third guide column, one end of the third guide column is connected to the connecting plate, and the other end of the third guide column vertically passes through the U-shaped frame.

[0015] Preferably, the third guide structure further includes a second moving block, the second moving block is connected to the driving frame, and the second moving block is slidably connected to the third guide column.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention is provided with a stretching frame, two multi-point stretching structures, a stretching drive structure and a lifting structure. In the initial state, a balanced state is formed between the stretching drive structure and the plurality of first springs, the distance between two adjacent clamping plates is fixed, and the stretching mechanism matches the speed of the circulating conveyor belt, thereby ensuring that the stretching process is synchronized with the moving speed of the film. Through the multi-point stretching structure, the distance between adjacent clamping plates can be adjusted, and as the force of the stretching drive structure on the clamping plates decreases, the first spring releases the stored elastic potential energy, so that the distance between the clamping plates gradually increases, thereby achieving uniform stretching of the film at multiple positions, effectively avoiding the problem of the film being thin in the middle and thick on both sides.

[0018] 2. The present invention is provided with two first guide structures. The moving direction of multiple clamps in the multi-point stretching structure is effectively restricted by the two first guide structures, ensuring that the forces applied to the film by each clamp in each multi-point stretching structure are in the same direction, thereby improving the uniformity and consistency of stretching and avoiding differences in film stretching effects caused by inconsistent directions of the clamps. The two first guide structures also limit the height of the clamps, so that the multiple clamps in the multi-point stretching structure can be maintained at the same height, ensuring that the multiple clamps in the multi-point stretching structure can contact the film at the same time, thereby achieving the same clamping force applied by each clamp on the film.

[0019] 3. The present invention is provided with a driving frame, two driving units, an adjusting structure and a first driving structure. The distance between the two driving units is adjusted according to the initial width of the film through the adjusting structure, thereby ensuring that the multi-point stretching structure can completely cover the width of the film. During the stretching process, the cooperation between the inclined surface on the driving block and the first spring effectively prevents the driving rod from moving in the horizontal direction, thereby realizing stable control of the position of the clamping plate. When the film needs to be stretched, the first driving structure applies a force to the driving frame away from the film, and the driving block moves in the vertical direction. The driving rod is moved along the inclined surface away from the middle of the stretching frame by the force of the first spring, and the connecting frame moves along the first guide rod. When the driving block stops moving, the driving rod stops moving, and the multiple clamping plates on the first guide rod all stop moving, thereby realizing stable control of the position of the clamping plate during the film stretching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereoscopic diagram of a biaxial stretching shaping device for film production according to the present invention.

[0021] Figure 2 It is a left view of a biaxial stretching shaping device for film production according to the present invention.

[0022] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle.

[0023] Figure 4 yes Figure 2 Stereoscopic cross-sectional view at AA in the middle.

[0024] Figure 5 It is a stereoscopic diagram of a stretching unit in a biaxial stretching shaping device for film production according to the present invention.

[0025] Figure 6 It is a stereoscopic diagram of a stretching frame, a first guide structure and a multi-point stretching structure in a biaxial stretching shaping device for film production of the present invention.

[0026] Figure 7 It is a stereoscopic diagram of a stretching frame, a multi-point stretching structure and a stretching drive structure in a biaxial stretching shaping device for film production of the present invention.

[0027] Figure 8 The present invention is a stereoscopic diagram of a driving frame, a driving unit and an adjusting structure in a biaxial stretching shaping device for film production.

[0028] Fig. 9 It is a stereoscopic diagram of a driving unit in a biaxial stretching shaping device for film production according to the present invention.

[0029] Fig.10The present invention is a stereoscopic diagram of a driving frame, a driving block and an adjusting structure in a biaxial stretching shaping device for film production.

[0030] Fig.11 It is a stereoscopic diagram of a driving frame and a first driving structure in a biaxial stretching shaping device for film production according to the present invention.

[0031] Fig.12 The present invention is a three-dimensional diagram of a stretching frame, a driving frame and a lifting structure in a biaxial stretching shaping device for film production.

[0032] Fig.13 The present invention is a stereoscopic diagram of a driving frame, a connecting plate, a U-shaped frame and a third guide structure in a biaxial stretching shaping device for film production.

[0033] The numbers in the figure are: 1, stretching frame; 2, first guide structure; 21, first guide rod; 22, first slide block; 3, multi-point stretching structure; 31, clamping plate; 32, first spring; 4, stretching drive structure; 41, drive frame; 42, drive unit; 421, drive block; 4211, inclined surface; 4212, inclined groove; 422, connecting frame; 423, drive rod; 43, adjustment structure; 431, second guide structure; 4311, second guide rod; 4312, second slide block; 4313, second spring; 43 2. Adjustment assembly; 4321. Adjustment plate; 4322. Drive plate; 4323. Adjustment bolt; 44. First drive structure; 441. Drive assembly; 4411. Double-headed screw; 4412. First moving block; 4413. Drive arm; 442. Synchronous transmission structure; 4421. Gear set; 4422. Rotary drive; 5. Lifting structure; 51. Connecting plate; 52. U-shaped frame; 53. Second drive structure; 54. Third guide structure; 541. Third guide column; 542. Second moving block. DETAILED DESCRIPTION

[0034] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Reference Figures 1 to 13As shown: A biaxial stretching shaping device for film production, including two stretching mechanisms arranged on the upper and lower sides of the film moving path, the stretching mechanism includes a circulating conveyor belt and a plurality of stretching units, the plurality of stretching units are arranged on the circulating conveyor belt at equal intervals, the stretching unit includes a stretching frame 1, two multi-point stretching structures 3, a stretching drive structure 4 and a lifting structure 5; the stretching frame 1 is divided into a first part and a second part; the two multi-point stretching structures 3 are respectively arranged on the first part and the second part of the stretching frame 1, the multi-point stretching structure 3 includes a plurality of clamping plates 31, the plurality of clamping plates 31 are arranged parallel to each other, the clamping plates 31 are slidably connected to the stretching frame 1, and two first springs 32 are arranged between two adjacent clamping plates 31, and the two ends of the first spring 32 are respectively abutted against the two clamping plates 31; the stretching drive structure 4 is arranged on one side of the stretching frame 1, and the stretching drive structure 4 is connected to the two multi-point stretching structures 3; the lifting structure 5 is arranged between the circulating conveyor belt and the stretching frame 1.

[0036] In the initial state, the stretching drive structure 4 applies opposite forces to the two multi-point stretching structures 3. At this time, the distance between the two adjacent clamps 31 in the multi-point stretching structure 3 is shortened, and the two first springs 32 between the two adjacent clamps 31 are compressed and store elastic potential energy, and a balance state is formed between the multiple first springs 32 and the stretching drive structure 4. When the film enters the stretching process, the two stretching mechanisms operate synchronously, and the speed of the circulating conveyor belt matches the moving speed of the film. When the stretching unit is conveyed to the initial stretching position of the film, the lifting structure 5 is started to drive the multi-point stretching structure 3 to approach the film until the multi-point stretching structure 3 in the upper and lower stretching mechanisms contacts the upper and lower surfaces of the film and completely covers the film. At this time, the clamps 31 in the multi-point stretching structure 3 contact the film at the same time and move with it. As the film moves, the stretching drive structure 4 gradually reduces the force on the multi-point stretching structure 3, causing the first springs 32 to release the stored elastic potential energy and the distance between the clamps 31 to increase, thereby achieving uniform stretching of the film at multiple positions, effectively avoiding the problem of the film being thin in the middle and thick on both sides.

[0037] Reference Figure 5 and Figure 6 As shown: the stretching unit also includes two first guide structures 2, which are respectively arranged on both sides of the stretching frame 1, and both ends of the clamping plate 31 are respectively connected to the two first guide structures 2. The first guide structure 2 includes a first guide rod 21 and a plurality of first sliders 22. The first guide rod 21 is arranged parallel to one side of the stretching frame 1 along the length direction of the stretching frame 1, and the plurality of first sliders 22 are slidably connected to the first guide rod 21, and the plurality of first sliders 22 are connected to the plurality of clamping plates 31 in the two multi-point stretching structures 3, and the two first springs 32 are respectively sleeved on the first guide rods 21 in the two first guide structures 2.

[0038] When the multiple clamps 31 in the multi-point stretching structure 3 are not at the same height, when each clamp 31 contacts the film and applies a stretching force, it may cause inconsistent stretching effects on different sections of the film. Therefore, a first guide structure 2 is set on both sides of the stretching frame 1, and the multiple clamps 31 in the multi-point stretching structure 3 are slidably connected to the first guide rods 21 in the two first guide structures 2. Therefore, the first guide rods 21 limit the moving direction of the multiple clamps 31, ensuring that the forces applied to the film by the multiple clamps 31 in a multi-point stretching structure 3 are in the same direction, thereby improving the uniformity and consistency of the stretching. At the same time, the two first guide rods 21 in the two first guide structures 2 limit the height of the clamps 31, so that the multiple clamps 31 in the multi-point stretching structure 3 can be maintained at the same height, ensuring that the multiple clamps 31 in the multi-point stretching structure 3 can contact the film at the same time, thereby achieving the same clamping force applied by each clamp 31 to the film.

[0039] Reference Figure 7 and Figure 8 As shown: the stretching driving structure 4 includes a driving frame 41, two driving units 42, an adjusting structure 43 and a first driving structure 44; the driving frame 41 is arranged in parallel on one side of the stretching frame 1; the two driving units 42 are respectively arranged at both ends of the driving frame 41, and the driving unit 42 includes a driving block 421, a connecting frame 422 and a driving rod 423, the driving block 421 is connected to the driving frame 41, and the driving block 421 is provided with an inclined surface 4211 on the side facing the stretching frame 1, the connecting frame 422 is slidably connected to the first guide structure 2, the two ends of the driving rod 423 are connected to the connecting frame 422, and the middle part of the driving rod 423 is slidably connected to the inclined surface 4211 of the driving block 421; the adjusting structure 43 is arranged in the middle part of the driving frame 41, and the adjusting structure 43 is connected to the two driving units 42; the first driving structure 44 is arranged on one side of the driving frame 41, and the first driving structure 44 is connected to the driving frame 41.

[0040] According to the initial width of the film, the adjustment structure 43 adjusts the distance between the two driving units 42 so that the two multi-point stretching structures 3 controlled by the two driving units 42 can completely cover the initial width of the film. At this time, the end of the inclined surface 4211 on the driving block 421 close to the middle of the stretching frame 1 contacts the driving rod 423, and the cooperation between the inclined surface 4211 on the driving block 421 and the first spring 32 will prevent the driving rod 423 from moving in the horizontal direction. When the film needs to be stretched, the first driving structure 44 applies a force to the driving frame 41 away from the film, and the driving block 421 moves in the vertical direction. The driving rod 423 is affected by the force of the first spring 32 and moves along the inclined surface 4211 in the direction away from the middle of the stretching frame 1, and the connecting frame 422 moves along the first guide rod 21. When the driving block 421 stops moving, the driving rod 423 stops moving, and the multiple clamps 31 on the first guide rod 21 all stop moving, thereby achieving stable control of the position of the clamps 31 during the film stretching process.

[0041] Reference Fig. 9 As shown, an inclined groove 4212 is formed on the driving block 421 , and a driving rod 423 is disposed in the inclined groove 4212 , and the driving rod 423 abuts against the groove wall of the inclined groove 4212 .

[0042] Since the inclined surface 4211 of the driving block 421 is in sliding contact with the driving rod 423, and the inclined surface 4211 does not extend infinitely, when the adjustment structure 43 adjusts the distance between the two driving blocks 421 in the two driving units 42, the inclined surface 4211 of the driving block 421 may be separated from the driving rod 423. By opening an inclined groove 4212 on the driving block 421, the driving rod 423 slides in the inclined groove 4212, and the two ends of the inclined groove 4212 can limit the moving range of the driving rod 423, thereby avoiding the driving rod 423 from being separated from the driving block 421 during the process of adjusting the distance between the two driving blocks 421, thereby enhancing the stability of the entire tensile driving structure 4.

[0043] Reference Figure 8 and Fig.10As shown in the figure: the adjustment structure 43 includes two second guide structures 431 and an adjustment component 432; the two second guide structures 431 are respectively arranged at the two ends of the driving frame 41, the two driving units 42 are connected to the two second guide structures 431, the second guide structure 431 includes a second guide rod 4311, a second slider 4312 and a second spring 4313, the second guide rod 4311 is arranged parallel to the length direction of the driving frame 41, the second guide rod 4311 is connected to the driving frame 41, the second slider 4312 is slidably connected to the second guide rod 4311, the second spring 4313 is sleeved on the second guide rod 4311, and the two ends of the second spring 4313 are respectively connected to the second slider 4312 and the second spring 4313. The ends of the two guide rods 4311 are abutted; the adjusting component 432 is arranged between the two second guide structures 431, the adjusting component 432 is connected to the two second guide structures 431, the adjusting component 432 includes an adjusting plate 4321, two driving plates 4322 and an adjusting bolt 4323, the adjusting plate 4321 is arranged in parallel in the middle of the driving frame 41 along the length direction of the driving frame 41, the two driving plates 4322 are respectively arranged on both sides of the adjusting plate 4321, the two ends of the driving plate 4322 are respectively axially connected to the adjusting plate 4321 and the second slider 4312, the middle part of the adjusting bolt 4323 is connected to the driving frame 41, and one end of the adjusting bolt 4323 is abutted against the adjusting plate 4321.

[0044] If the distance between the two clamping plates 31 at the ends of the two multi-point stretching structures 3 is fixed, then the two multi-point stretching structures 3 can only stretch a film of a fixed width, so that the size of the produced film is single. By setting two second guide structures 431 and an adjustment component 432, the adjustment component 432 is first operated according to the initial width of the film. When the maximum distance between the two clamping plates 31 at the ends is greater than the width of the film, the adjustment bolt 4323 is rotated, and the adjustment bolt 4323 moves toward the adjustment plate 4321, and the adjustment plate 4321 moves away from the driving frame 41. At the same time, the adjustment plate 4321 is moved by two driving The plate 4322 drives the two second sliders 4312 to move along their respective corresponding second guide rods 4311, and the two second sliders 4312 approach each other, so that the two driving blocks 421 connected to the two second sliders 4312 approach each other, and the inclined surface 4211 on the driving block 421 applies a force toward the middle of the stretching frame 1 to the clamping plate 31 through the driving rod 423 and the connecting frame 422, so that the two clamping plates 31 located at the ends approach each other. When the distance between the two clamping plates 31 is the same as the width of the film, the rotation of the adjusting bolt 4323 is stopped, thereby realizing that the multi-point stretching structure 3 can adapt to films of different widths.

[0045] Reference Figure 7 and Fig.11As shown: the first driving structure 44 includes two driving components 441 and a first synchronous transmission structure 442; the two driving components 441 are respectively arranged on both sides of the driving frame 41, and the two driving components 441 are connected to both sides of the driving frame 41, and the driving component 441 includes a double-headed screw rod 4411, two first moving blocks 4412 and two driving arms 4413, the double-headed screw rod 4411 is arranged in parallel on one side of the driving frame 41, and the two first moving blocks 4412 are respectively arranged on the two threaded parts of the double-headed screw rod 4411, The two driving arms 4413 correspond to the two first moving blocks 4412 respectively, and the two ends of the driving arms 4413 are respectively axially connected to the first moving blocks 4412 and the driving frame 41; the synchronous transmission structure 442 is arranged at the same end of the two driving components 441, and the synchronous transmission structure 442 is connected to the two driving components 441, and the synchronous transmission structure 442 includes a gear set 4421 and a rotation driver 4422, the gear set 4421 is connected to the two double-headed screws 4411, and the rotation driver 4422 is connected to the gear set 4421.

[0046] During the film stretching process, the synchronous transmission structure 442 starts to work, and the rotary driver 4422 starts. Through the transmission action of the gear set 4421, the two double-headed screws 4411 are driven to rotate in the same direction and speed at the same time. During the rotation of the double-headed screw 4411, the two first moving blocks 4412 thereon approach each other, and the movement of the two first moving blocks 4412 thereby drives the driving arms 4413 connected thereto to move, so that the two driving arms 4413 approach each other. During this process, the two driving arms 4413 apply a vertical upward force away from the film to one side of the driving frame 41. Since both sides of the driving frame 41 are equipped with driving components 441, the two driving components 441 will simultaneously apply a balanced force to both sides of the driving frame 41, ensuring that the driving frame 41 maintains stable movement during the force application process, so that the two driving units 42 at both ends of the driving frame 41 can evenly apply force to the two multi-point stretching structures 3, thereby achieving stable stretching of the film by the multi-point stretching structures 3.

[0047] Reference Figure 4 and Fig.12 As shown: the lifting structure 5 includes a connecting plate 51, a U-shaped frame 52 and a second driving structure 53; the connecting plate 51 is parallel to the stretching frame 1, and the connecting plate 51 is connected to the circulating conveyor belt; the two ends of the U-shaped frame 52 are connected to the two ends of the stretching frame 1, and the middle part of the U-shaped frame 52 is parallel to the connecting plate 51; the second driving structure 53 is arranged between the connecting plate 51 and the U-shaped frame 52, and the second driving structure 53 is connected to the connecting plate 51 and the U-shaped frame 52.

[0048] In the film processing process, the circulating conveyor belt first drives the clamping plate 31 to rotate to a position parallel to the film. However, in order to avoid scratching caused by partial contact with the film during the angle change of the clamping plate 31, resulting in damage to the film, the clamping plate 31 does not immediately contact the film at this position. By setting a connecting plate 51, a U-shaped frame 52 and a second driving structure 53, the U-shaped frame 52 and the second driving structure 53 suspend the stretching frame 1, the first guide structure 2, the multi-point stretching structure 3 and the stretching drive structure 4 on the connecting plate 51, and connect them to the circulating conveyor belt through the connecting plate 51. When the clamping plate 31 rotates to be parallel to the film, the second driving structure 53 applies a force toward the film to the U-shaped frame 52, and the film drives the stretching frame 1, the first guide structure 2, the multi-point stretching structure 3 and the stretching drive structure 4 to translate toward the film as a whole, so that the clamping plate 31 contacts the film during the translation process, thereby ensuring the stability and safety of the contact process and effectively avoiding damage to the film.

[0049] Reference Figure 5 , Fig.11 and Fig.12 As shown: the second driving structure 53 has the same structure as the first driving structure 44 .

[0050] The rotary driver 4422 in the second drive structure 53 drives the two drive components 441 to operate simultaneously through the gear set 4421, so that the forces on both sides of the U-shaped frame 52 are parallel, thereby ensuring the stability and accuracy of the U-shaped frame 52 when driving the multiple clamps 31 to move toward the film. The structure of the second drive structure 53 is set to be the same as that of the first drive structure 44, so that the components of the two can be interchangeable, thereby reducing the maintenance cost of the device.

[0051] Reference Fig.12 and Fig.13 As shown: the lifting structure 5 also includes two third guide structures 54, which are respectively arranged at both ends of the connecting plate 51, and the third guide structure 54 includes a third guide column 541, one end of the third guide column 541 is connected to the connecting plate 51, and the other end of the third guide column 541 vertically passes through the U-shaped frame 52.

[0052] When the second driving structure 53 is started and drives the U-shaped frame 52 to move away from or closer to the connecting plate 51, the second driving structure 53 can apply a balanced force on both sides of the U-shaped frame 52 to ensure that the forces on both sides of the U-shaped frame 52 remain balanced. However, in the absence of additional constraints, the two ends of the U-shaped frame 52 may produce asynchronous movement due to lack of restrictions, resulting in the two multi-point stretching structures 3 being unable to contact the film at the same time. By setting two third guide structures 54, the two third guide pillars 541 effectively restrict and guide the two ends of the U-shaped frame 52. When the second driving structure 53 applies a force to the U-shaped frame 52, the U-shaped frame 52 will move smoothly along the third guide pillars 541, ensuring the stability of the U-shaped frame 52 itself, thereby achieving the U-shaped frame 52 remaining stable and driving the two multi-point stretching structures 3 to move synchronously toward the film.

[0053] Reference Fig.13 As shown, the third guide structure 54 further includes a second moving block 542 , the second moving block 542 is connected to the driving frame 41 , and the second moving block 542 is slidably connected to the third guide column 541 .

[0054] When the first driving structure 44 starts to adjust the distance between the driving frame 41 and the stretching frame 1, the two sides of the driving frame 41 will be subjected to the balanced force from the first driving structure 44 to ensure that the forces on both sides of the driving frame 41 are balanced. However, if the two ends of the driving frame 41 are not restricted in any form, the movement of the two ends may become unstable, thereby affecting the balance of the overall structure. By arranging two second moving blocks 542 at the two ends of the driving frame 41, the two second moving blocks 542 respectively form a tight sliding connection with the two third guide pillars 541. During the movement of the driving frame 41, the two second moving blocks 542 will slide along their respective third guide pillars 541. At the same time, the connection relationship between the two second moving blocks 542 and the driving frame 41 ensures the stability and balance of the two ends of the driving frame 41 during the movement, so that the driving frame 41 can transmit the force to the two driving units 42 in a more uniform and stable manner, thereby ensuring that the two driving units 42 can work synchronously during the stretching process of the film.

[0055] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A biaxial stretching shaping device for film production, characterized in that: It comprises two stretching mechanisms arranged on the upper and lower sides of a film moving path, the stretching mechanism comprises a circulating conveyor belt and a plurality of stretching units, the plurality of stretching units are arranged on the circulating conveyor belt at equal intervals, and the stretching unit comprises a stretching frame (1), two multi-point stretching structures (3), a stretching driving structure (4) and a lifting structure (5); The stretching frame (1) is divided into a first part and a second part; Two multi-point stretching structures (3) are respectively arranged on the first part and the second part of the stretching frame (1), and the multi-point stretching structure (3) comprises a plurality of clamping plates (31), the plurality of clamping plates (31) are arranged parallel to each other, the clamping plates (31) are slidably connected to the stretching frame (1), and two first springs (32) are arranged between two adjacent clamping plates (31), and two ends of the first spring (32) are respectively in contact with the two clamping plates (31); The stretching drive structure (4) is arranged on one side of the stretching frame (1), and the stretching drive structure (4) is connected to the two multi-point stretching structures (3); The lifting structure (5) is arranged between the circulating conveyor belt and the stretching frame (1).

2. A biaxial stretching shaping device for film production according to claim 1, characterized in that: The stretching unit further comprises two first guide structures (2), the two first guide structures (2) are respectively arranged on both sides of the stretching frame (1), and the two ends of the clamping plate (31) are respectively connected to the two first guide structures (2).

3. A biaxial stretching shaping device for film production according to claim 1, characterized in that: The stretching drive structure (4) comprises a drive frame (41), two drive units (42), an adjustment structure (43) and a first drive structure (44); The driving frame (41) is arranged in parallel on one side of the stretching frame (1); The two driving units (42) are respectively arranged at two ends of the driving frame (41), and the driving unit (42) comprises a driving block (421), a connecting frame (422) and a driving rod (423); the driving block (421) is connected to the driving frame (41); a slope (4211) is provided on a side of the driving block (421) facing the stretching frame (1); the connecting frame (422) is slidably connected to the first guide structure (2); two ends of the driving rod (423) are connected to the connecting frame (422); and a middle portion of the driving rod (423) is slidably connected to the slope (4211) of the driving block (421); The adjustment structure (43) is arranged in the middle of the driving frame (41), and the adjustment structure (43) is connected to the two driving units (42); The first driving structure (44) is arranged on one side of the driving frame (41), and the first driving structure (44) is connected to the driving frame (41).

4. A biaxial stretching shaping device for film production according to claim 3, characterized in that: An inclined groove (4212) is provided on the driving block (421), and the driving rod (423) is arranged in the inclined groove (4212), and the driving rod (423) abuts against the groove wall of the inclined groove (4212).

5. The biaxial stretching shaping device for film production according to claim 3, characterized in that: The adjustment structure (43) includes two second guide structures (431) and an adjustment component (432); The two second guide structures (431) are respectively arranged at two ends of the driving frame (41), and the two driving units (42) are connected to the two second guide structures (431); The adjustment component (432) is disposed between the two second guide structures (431), and the adjustment component (432) is connected to the two second guide structures (431).

6. A biaxial stretching shaping device for film production according to claim 3, characterized in that: The first driving structure (44) includes two driving components (441) and a first synchronous transmission structure (442); The two driving assemblies (441) are respectively arranged on both sides of the driving frame (41), and the two driving assemblies (441) are connected to both sides of the driving frame (41); The synchronous transmission structure (442) is arranged at the same end of the two driving assemblies (441), and the synchronous transmission structure (442) is connected to the two driving assemblies (441).

7. The biaxial stretching shaping device for film production according to claim 1, characterized in that: The lifting structure (5) comprises a connecting plate (51), a U-shaped frame (52) and a second driving structure (53); The connecting plate (51) is parallel to the stretching frame (1), and the connecting plate (51) is connected to the circulating conveyor belt; The two ends of the U-shaped frame (52) are connected to the two ends of the stretching frame (1), and the middle part of the U-shaped frame (52) is parallel to the connecting plate (51); The second driving structure (53) is arranged between the connecting plate (51) and the U-shaped frame (52), and the second driving structure (53) is connected to the connecting plate (51) and the U-shaped frame (52).

8. A biaxial stretching shaping device for film production according to claim 7, characterized in that: The second driving structure (53) has the same structure as the first driving structure (44).

9. A biaxial stretching shaping device for film production according to claim 7, characterized in that: The lifting structure (5) further comprises two third guide structures (54), the two third guide structures (54) being respectively arranged at two ends of the connecting plate (51), the third guide structure (54) comprising a third guide column (541), one end of the third guide column (541) being connected to the connecting plate (51), and the other end of the third guide column (541) vertically passing through the U-shaped frame (52).

10. A biaxial stretching shaping device for film production according to claim 9, characterized in that: The third guide structure (54) further comprises a second moving block (542), the second moving block (542) is connected to the driving frame (41), and the second moving block (542) is slidably connected to the third guide column (541).

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