Biaxial stretching mechanism for BOPP (Biaxially-oriented Polypropylene) ultra-

Abstract

The utility model discloses a biaxially-oriented polypropylene (BOPP) ultra-transparent film two-way stretching mechanism which comprises a base, the upper surface of the base is fixedly connected with a side plate, the side face of the side plate is rotationally connected with one end of a guide roller, the upper surface of the base is rotationally connected with the bottom of a rotary drum, the outer side of the rotary drum is fixedly connected with a worm gear, a first threaded rod is arranged in the rotary drum, and the top of the first threaded rod is fixedly connected with a connecting block. The upper surface of the base is fixedly connected with a fixing plate, the fixing plate is rotationally connected with the outer side of the worm, and the upper surface of the base is fixedly connected with the workbench. The two-way lead screw rotates to enable the adjusting blocks to move oppositely, the pressing plate moves downwards to clamp and fix a thin film, the pressing plate enables the fixed position of the thin film to be stressed more evenly, the situation that the thin film is broken due to uneven stress in the stretching process is avoided, the worm drives the rotating cylinder and the worm wheel to rotate synchronously, the adjusting roller is driven to move up and down, and therefore the thin film stretching efficiency is improved. And the tightness of the film is adjusted through the adjusting roller.

Description

Technical Field

[0001] This utility model relates to the field of BOPP production technology, specifically to a biaxial stretching mechanism for BOPP ultra-transparent film. Background Technology

[0002] BOPP, also known as biaxially oriented polypropylene film, is a type of film made by first passing a melt of high molecular weight polypropylene through a narrow die head to form a sheet or thick film, and then stretching it simultaneously or stepwise in two vertical directions (longitudinal and transverse) in a special stretching machine at a certain temperature and set speed. The film is then subjected to appropriate cooling or heat treatment or special processing (such as corona coating).

[0003] To ensure uniform stress on BOPP film during stretching and prevent film damage, patent CN222039577 U discloses a multi-point contact stretching mechanism for uniform stretching of BOPP heat-sealing film. This patent includes a mounting base with a rotating shaft on it. The rotating shaft has multiple first gears, and the mounting base has a rack that meshes with the first gears. The rack is movably mounted on the mounting base. This patent uses a first power source to drive a second gear to rotate a rotating screw, thereby causing a second clamping block to move towards the clamping block until the film is clamped.

[0004] However, the aforementioned patent sets up multiple first power sources and multiple second gears, which increases the overall cost of use and maintenance of the device. The multi-point fixing still has limitations in terms of uniform force distribution. The uniformity of stretching at the fixing point of the film is poor. Furthermore, the aforementioned patent cannot adjust the guide roller and preheating roller, nor can it adjust the tension of the film stretching, which affects the actual use effect. Utility Model Content

[0005] The purpose of this invention is to provide a biaxial stretching mechanism for BOPP ultra-transparent film to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a biaxial stretching mechanism for BOPP ultra-transparent film, comprising a base, the upper surface of which is fixedly connected to a side plate, the side of which is rotatably connected to one end of a guide roller, the upper surface of which is rotatably connected to the bottom of a rotating drum, the outer side of which is fixedly connected to a worm gear, a threaded rod 1 inside the rotating drum, the top of which is fixedly connected to a connecting block, the connecting block being rotatably connected to one end of an adjusting roller, the upper surface of which is fixedly connected to a fixed plate, the fixed plate being rotatably connected to the outer side of the worm gear, the upper surface of which is fixedly connected to a worktable, a motor 1 fixedly mounted on the side of the worktable, the output end of which is fixedly connected to a threaded rod 2, a moving block on the worktable, the top of which is fixedly connected to a support frame, a motor 2 fixedly mounted on the top of the support frame, the output end of which is fixedly connected to a biaxial lead screw, an adjusting block on the outer side of the biaxial lead screw, the bottom of which is hinged to one end of a connecting plate, and a pressure plate on the other end of the connecting plate.

[0007] Preferably, the base is rotatably connected to the bottom of the rotating cylinder via a bearing sleeve, and a threaded groove is formed inside the rotating cylinder, which is threaded to an outer side of the threaded rod via the threaded groove.

[0008] Preferably, one end of the worm extends to the outside of the fixed plate and is fixedly connected to the handwheel, and the outside of the worm is engaged with two symmetrical worm wheels.

[0009] Preferably, the movable block has a threaded hole on its side, and the movable block is threaded to the outer side of the threaded rod through the threaded hole.

[0010] Preferably, the support frame is a C-shaped plate, and a strip groove is formed on the top of the support frame. One end of the connecting plate passes through the strip groove and is movably hinged to the top of the pressure plate.

[0011] Preferably, the two ends of the bidirectional lead screw are provided with opposite threads, the adjusting block and the connecting plate are symmetrically distributed on both sides of the bidirectional lead screw, and the adjusting block is connected to the outer thread of the bidirectional lead screw through a threaded hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model uses a worktable, a threaded rod, a moving block, a support frame, a bidirectional lead screw, an adjusting block, and a pressure plate. The bidirectional lead screw is rotated by a motor, which causes the adjusting blocks on both sides to move towards each other. The pressure plate moves downward through the connecting plate and works with the support frame to clamp and fix one end of the film. The pressure plate makes the force on the fixed part of the film more uniform, avoiding the film from breaking due to uneven force when stretched.

[0014] This invention also utilizes a rotating drum, worm gear, threaded rod, connecting block, adjusting roller, and fixing plate. By rotating the handwheel, the worm gear drives the rotating drum and worm gear to rotate synchronously, further causing the threaded rod to move inside the rotating drum, which in turn moves the adjusting roller up and down. The adjusting roller is used to adjust the tightness of the film, thereby enhancing the actual performance of the film stretching. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the guide roller and adjusting roller structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the workbench structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the support frame structure of this utility model.

[0019] In the diagram: 1. Base; 2. Side plate; 3. Guide roller; 4. Rotary drum; 5. Worm gear; 6. Threaded rod one; 7. Connecting block; 8. Adjusting roller; 9. Fixing plate; 10. Worm; 11. Worktable; 12. Motor one; 13. Threaded rod two; 14. Moving block; 15. Support frame; 16. Motor two; 17. Double-acting lead screw; 18. Adjusting block; 19. Connecting plate; 20. Pressure plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4This utility model provides a technical solution: a biaxial stretching mechanism for BOPP ultra-transparent film, including a base 1, the upper surface of the base 1 is welded and fixed to a side plate 2, the side of the side plate 2 is rotatably connected to one end of a guide roller 3, the upper surface of the base 1 is rotatably connected to the bottom of a rotating cylinder 4, the outer side of the rotating cylinder 4 is welded and fixed to a worm gear 5, the rotating cylinder 4 is threadedly connected to the outer side of a threaded rod 6, the top of the threaded rod 6 is welded and fixed to a connecting block 7, the connecting block 7 is a square block, the connecting block 7 is rotatably connected to one end of an adjusting roller 8 via a rotating shaft, the upper surface of the base 1 is welded and fixed to a fixing plate 9, the fixing plate 9 is rotatably connected to the outer side of a worm gear 10, and the upper surface of the base 1 is welded to a worktable 11. The workbench 11 is fixedly connected to motor 12 via bolts on its side. The output end of motor 12 is welded to threaded rod 13. A movable block 14 is installed inside the workbench 11. The top of the movable block 14 is welded to support frame 15. The top of support frame 15 is fixedly connected to motor 16. The top of support frame 15 is fixedly connected to ear plate. Ear plate is rotatably connected to one end of double-acting screw 17. The output end of motor 16 is welded to double-acting screw 17. An adjusting block 18 is installed on the outside of double-acting screw 17. The bottom of adjusting block 18 is hinged to one end of connecting plate 19. The other end of connecting plate 19 is movably hinged to the hinge plate on the top of pressure plate 20.

[0022] The base 1 is rotatably connected to the bottom of the rotating drum 4 via a bearing sleeve. A threaded groove is formed inside the rotating drum 4, which is threaded to the outer side of the threaded rod 6 via the threaded groove. One end of the worm 10 extends to the outer side of the fixed plate 9 and is welded and fixed to the handwheel. The outer side of the worm 10 is engaged with two symmetrical worm wheels 5. Rotating the handwheel causes the worm 10 to rotate, which in turn drives the rotating drum 4 and the worm wheels 5 to rotate synchronously, causing the threaded rod 6 to move up and down inside the rotating drum 4. The tension of the film is adjusted by adjusting the height of the adjusting roller 8.

[0023] The moving block 14 is connected to the outer thread of the threaded rod 13 through a threaded hole. The support frame 15 is an inverted plate with a strip groove on the top and anti-slip tooth grooves inside. The bottom of the pressure plate 20 is equipped with a flexible anti-slip pad.

[0024] One end of the connecting plate 19 passes through the strip groove and is movably hinged to the top of the pressure plate 20. The two ends of the bidirectional lead screw 17 are provided with opposite threads. The adjusting block 18 and the connecting plate 19 are symmetrically distributed on both sides of the bidirectional lead screw 17. The adjusting block 18 is connected to the outer thread of the bidirectional lead screw 17 through a threaded hole.

[0025] Working principle: In use, one end of the BOPP film is passed through the guide roller 3 and the adjusting roller 8 and extends into the support frame 15. The motor 16 rotates the bidirectional lead screw 17, which in turn moves the adjusting blocks 18 on both sides toward each other. The connecting plate 19 pushes the pressure plate 20 to move downward inside the support frame 15 until the support frame 15 and the pressure plate 20 clamp and fix one end of the film. Then, the motor 12 rotates, which drives the moving block 14 to move in the limiting groove at the top of the worktable 11. At the same time, the support frame 15 stretches the film. Then, the handwheel is turned to rotate the worm gear 10, which drives the rotating drum 4 and the worm wheel 5 to rotate synchronously. This causes the threaded rod 6 to move up and down inside the rotating drum 4. The tightness of the film is adjusted by adjusting the height of the adjusting roller 8. The structure is simple and the operation is convenient.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biaxial stretching mechanism for BOPP ultra-transparent film, comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly connected to the side plate (2), the side of the side plate (2) is rotatably connected to one end of the guide roller (3), the upper surface of the base (1) is rotatably connected to the bottom of the rotating drum (4), the outer side of the rotating drum (4) is fixedly connected to the worm gear (5), a threaded rod (6) is provided inside the rotating drum (4), the top of the threaded rod (6) is fixedly connected to the connecting block (7), the connecting block (7) is rotatably connected to one end of the adjusting roller (8), the upper surface of the base (1) is fixedly connected to the fixing plate (9), the fixing plate (9) is rotatably connected to the outer side of the worm gear (10), and the upper surface of the base (1) is fixedly connected to the worktable (11). The workbench (11) is connected to a motor (12) fixedly installed on the side. The output end of the motor (12) is fixedly connected to the threaded rod (13). A moving block (14) is provided on the workbench (11). The top of the moving block (14) is fixedly connected to the support frame (15). A motor (16) is fixedly installed on the top of the support frame (15). The output end of the motor (16) is fixedly connected to the double-acting screw (17). An adjusting block (18) is provided on the outside of the double-acting screw (17). The bottom of the adjusting block (18) is hinged to one end of the connecting plate (19). A pressure plate (20) is provided on the other end of the connecting plate (19).

2. The BOPP ultra-transparent film biaxial stretching mechanism according to claim 1, characterized in that: The base (1) is rotatably connected to the bottom of the rotating cylinder (4) through a bearing sleeve. The rotating cylinder (4) has a threaded groove inside and is threaded to the outside of the threaded rod (6) through the threaded groove.

3. The BOPP ultra-transparent film biaxial stretching mechanism according to claim 1, characterized in that: One end of the worm (10) extends to the outside of the fixed plate (9) and is fixedly connected to the handwheel. The outside of the worm (10) is engaged with two symmetrical worm wheels (5).

4. The BOPP ultra-transparent film biaxial stretching mechanism according to claim 1, characterized in that: The movable block (14) has a threaded hole on its side, and the movable block (14) is threaded to the outer side of the threaded rod (13) through the threaded hole.

5. The BOPP ultra-transparent film biaxial stretching mechanism according to claim 1, characterized in that: The support frame (15) is a U-shaped plate. A strip groove is opened on the top of the support frame (15). One end of the connecting plate (19) passes through the strip groove and is movably hinged to the top of the pressure plate (20).

6. The BOPP ultra-transparent film biaxial stretching mechanism according to claim 1, characterized in that: The two ends of the bidirectional lead screw (17) are provided with opposite threads. The adjusting block (18) and the connecting plate (19) are symmetrically distributed on both sides of the bidirectional lead screw (17). The adjusting block (18) is threaded to the outer side of the bidirectional lead screw (17) through a threaded hole.

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