Plastic film blow molding guide frame

Abstract

The utility model relates to the technical field of plastic film blow molding, and particularly discloses a plastic film blow molding material guide frame which comprises a rectangular frame, a material guide mechanism is arranged in the rectangular frame, and the material guide mechanism comprises four U-shaped connecting frames which are located in the rectangular frame and distributed in a circumferential array mode. Two connecting plates which are symmetrically distributed and extend to the outer side of the U-shaped connecting frame are arranged in the U-shaped connecting frame, and one end of each connecting plate is fixedly connected with a U-shaped plate; a servo electric telescopic rod drives a U-shaped connecting frame, a connecting plate and a U-shaped plate to be linked, so that displacement adjustment and position locking of a guide roller are realized; a steering shaft is driven to enable a connecting plate to deflect to complete angle adjustment of a guide roller, accurate angle locking is guaranteed by presetting the number of rotation turns of a motor and the self-locking characteristic of a worm gear and a worm, and finally through two-section cooperative adjustment of the position and the angle, the guide roller dynamically adapts to the size of a pipe blank and keeps accurate tangent to the outer wall of the pipe blank. The problem that a traditional device is insufficient in applicability and flexibility due to the fact that the guide roller is fixed is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of plastic film blow molding technology, and specifically discloses a plastic film blow molding guide rack. Background Technology

[0002] Plastic film, widely used in packaging, agriculture, and building materials, is a crucial basic material in modern industrial production due to its lightweight, flexibility, and adjustable functions. Blow molding is the main production process for plastic film. This process involves melting and plasticizing polymer raw materials in an extruder, forming a hollow tubular preform through the die head, and then producing a film through blowing, cooling, and traction. In this process, the guide frame, as a key component, ensures the stable movement of the extruded preform through a mechanical contact guiding structure, providing fundamental support for subsequent blowing, cooling, and traction processes.

[0003] Existing devices primarily use multiple guide rollers installed inside the frame to provide mechanical constraints, stabilizing the tube blank's trajectory and preventing deviation or swaying, thus achieving the material guiding function. However, the fixed position and angle of the guide rollers in existing devices cannot adapt to the guiding requirements of tube blanks of different sizes, resulting in poor equipment applicability and production flexibility. Therefore, there is an urgent need for a plastic film blow molding material guide frame that can solve the above problems. Utility Model Content

[0004] This invention proposes a plastic film blow molding guide rack that can flexibly adjust the angle and position of multiple guide rollers according to the size of the tube blank, thereby ensuring that the guide rollers maintain reasonable tangential contact with the outer wall of the tube blank, effectively solving the problem of insufficient applicability and flexibility caused by the fixed position and angle of the guide rollers.

[0005] This utility model is implemented as follows: a plastic film blow molding guide rack includes a rectangular frame, and a guiding mechanism is provided inside the rectangular frame. The guiding mechanism includes four U-shaped connecting frames located inside the rectangular frame and arranged in a circumferential array. Two symmetrically distributed connecting plates extending to their outer sides are provided inside the U-shaped connecting frames. One end of each of the two connecting plates is fixedly connected to a U-shaped plate, and a guide roller is rotatably connected inside each of the two U-shaped plates.

[0006] The rectangular frame is equipped with four angle adjustment mechanisms. Each angle adjustment mechanism includes two steering shafts rotatably connected to the inside of a U-shaped connecting frame. The two steering shafts are respectively fixedly connected to two connecting plates. A drive frame is fixedly connected to the outer wall of the U-shaped connecting frame. One end of each of the two steering shafts is fixedly connected to a transmission shaft extending into the drive frame. The other end of each of the two transmission shafts is fixedly connected to a worm gear. The outer walls of the two worm gears are respectively meshed with a first worm and a second worm rotatably connected to the inside of the drive frame. A motor with its output end fixedly connected to the first worm is installed on the outer wall of the drive frame.

[0007] The outer wall of the rectangular frame is equipped with four servo-electric telescopic rods, and the output ends of the four servo-electric telescopic rods are respectively fixedly connected to four U-shaped connecting frames.

[0008] As a preferred embodiment of the plastic film blow molding guide frame of this utility model, a co-moving shaft is fixedly connected between the first worm and the second worm.

[0009] In a preferred embodiment of the plastic film blow molding guide frame of this utility model, the helical teeth of the first worm and the second worm are in opposite directions.

[0010] As a preferred embodiment of the plastic film blow molding guide frame of this utility model, each of the four U-shaped connecting frames has two slide rods fixedly connected to its outer wall, and the slide rods respectively pass through the rectangular frame and are slidably connected to the rectangular frame.

[0011] In a preferred embodiment of the plastic film blow molding guide frame of this utility model, the motor is a servo motor.

[0012] In a preferred embodiment of the plastic film blow molding guide frame of this utility model, a portion of the guide roller is located on the outside of the U-shaped plate.

[0013] As a preferred embodiment of the plastic film blow molding guide frame of this utility model, a protective box located outside the motor is installed on the outer wall of the drive frame.

[0014] The beneficial effects of this utility model are:

[0015] The device uses a servo-electric telescopic rod to drive the U-shaped connecting frame, connecting plate, and U-shaped plate in a coordinated manner, thereby adjusting the displacement of the guide roller and locking its position. Simultaneously, a motor drives a worm gear and worm wheel to mesh in opposite directions, driving the steering shaft to deflect the connecting plate and complete the angle adjustment of the guide roller. The preset number of motor rotations and the self-locking characteristics of the worm gear and worm wheel ensure precise angle locking. Finally, through the coordinated adjustment of position and angle, the guide roller dynamically adapts to the billet size and maintains precise tangency with the outer wall of the billet, effectively solving the problem of insufficient applicability and flexibility caused by the fixed guide roller in traditional devices. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a top sectional view of the plastic film blow molding guide rack of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a partial top sectional view of the present invention;

[0020] Figure 4 This is a partial front cross-sectional view of the present invention;

[0021] Figure 5 This is a partial structural diagram of the present invention.

[0022] The markings in the diagram are: 1. Rectangular frame; 2. U-shaped connecting frame; 3. Steering shaft; 4. Connecting plate; 5. U-shaped plate; 6. Guide roller; 7. Drive frame; 8. Transmission shaft; 9. Worm gear; 10. First worm; 11. Second worm; 12. Co-moving shaft; 13. Motor; 14. Protective box; 15. Servo electric telescopic rod; 16. Slide rod. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0024] Please see Figure 1-5 A plastic film blow molding guide rack includes a rectangular frame 1. A guiding mechanism is provided inside the rectangular frame 1. The guiding mechanism includes four U-shaped connecting frames 2 located inside the rectangular frame 1 and arranged in a circular array. Two symmetrically distributed connecting plates 4 extending to their outer sides are provided inside the U-shaped connecting frames 2. A U-shaped plate 5 is fixedly connected to one end of each of the two connecting plates 4. A guide roller 6 is rotatably connected inside each of the two U-shaped plates 5.

[0025] The rectangular frame 1 is equipped with four angle adjustment mechanisms. The angle adjustment mechanism includes two steering shafts 3 rotatably connected to the inside of the U-shaped connecting frame 2. The two steering shafts 3 are fixedly connected to two connecting plates 4 respectively. The outer wall of the U-shaped connecting frame 2 is fixedly connected to a drive frame 7. One end of each of the two steering shafts 3 is fixedly connected to a transmission shaft 8 extending into the inside of the drive frame 7. The other end of each of the two transmission shafts 8 is fixedly connected to a worm gear 9. The outer walls of the two worm gears 9 are respectively meshed with a first worm 10 and a second worm 11 rotatably connected to the inside of the drive frame 7. The outer wall of the drive frame 7 is equipped with a motor 13 whose output end is fixedly connected to the first worm 10.

[0026] Four servo-electric telescopic rods 15 are installed on the outer wall of the rectangular frame 1, and the output ends of the four servo-electric telescopic rods 15 are fixedly connected to the four U-shaped connecting frames 2 respectively.

[0027] In this embodiment: when it is necessary to adapt to tube blanks of different sizes, the extension distance of the servo electric telescopic rod 15 needs to be calculated according to the actual size of the tube blank. The output end of the servo electric telescopic rod 15 drives the U-shaped connecting frame 2 fixedly connected to it to move. The U-shaped connecting frame 2 drives the U-shaped plate 5 and the guide roller 6 to move synchronously through the connecting plate 4 until the guide roller 6 reaches the preset position. Then, the servo electric telescopic rod 15 locks the current position to ensure that the guide roller 6 is positioned stably.

[0028] After the guide roller 6 is adjusted, the motor 13 starts and drives the first worm 10 and the second worm 11 to rotate synchronously. At the same time, it drives the two worm wheels 9 meshing with it to rotate in opposite directions. This rotation is transmitted to the steering shaft 3 through the transmission shaft 8, so that the two steering shafts 3 rotate synchronously in opposite directions. The steering shaft 3 drives the connecting plate 4 to deflect synchronously, thereby driving the U-shaped plate 5 and the guide roller 6 to adjust the angle until the multiple guide rollers 6 are adjusted to the appropriate angle. The number of rotations of the motor 13 is preset by the actual size of the tube blank to ensure that the guide roller 6 deflects to the target angle. After the adjustment is completed, the self-locking characteristic of the transmission between the first worm 10 and the second worm 11 and the worm wheel 9 is used to lock the position of the steering shaft 3 to prevent the guide roller 6 angle from shifting on its own.

[0029] Through the above two-stage coordinated adjustment, this guide frame can dynamically adjust the position and angle of the guide roller 6 according to the size of the tube blank, ensuring that it is precisely tangent to the outer wall of the tube blank, effectively solving the problem of insufficient applicability and flexibility caused by the fixed guide roller 6 in traditional devices.

[0030] As a technical optimization of this utility model, a co-moving shaft 12 is fixedly connected between the first worm 10 and the second worm 11.

[0031] In this embodiment, the first worm 10 and the second worm 11 are rigidly connected by a co-moving shaft 12 to ensure that their rotational speeds are completely consistent, thereby enabling the two worm wheels 9 to rotate synchronously in opposite directions.

[0032] As a technical optimization of this utility model, the helical teeth of the first worm 10 and the second worm 11 are in opposite directions.

[0033] In this embodiment, the helical teeth of the first worm 10 and the second worm 11 are in opposite directions, forcing the two worm wheels 9 meshing with them to rotate in opposite directions, thereby driving the steering shaft 3 to adjust the opposing angle of the guide roller 6.

[0034] As a technical optimization of this utility model, two slide rods 16 are fixedly connected to the outer walls of the four U-shaped connecting frames 2, and multiple slide rods 16 pass through the rectangular frame 1 and are slidably connected to the rectangular frame 1.

[0035] In this embodiment: two sliding rods 16 installed on the outer wall of the U-shaped connecting frame 2 pass through the rectangular frame 1 and are slidably connected to it, providing guidance and support for the movement of the U-shaped connecting frame 2, and ensuring that the movement process is smooth and without deviation.

[0036] As a technical optimization of this utility model, motor 13 is a servo motor.

[0037] In this embodiment, a servo motor is used as motor 13, and the speed and angle of the output shaft are precisely controlled by a closed-loop control system to achieve high-precision adjustment of the guide roller 6 angle.

[0038] As a technical optimization of this utility model, a portion of the guide roller 6 is located on the outside of the U-shaped plate 5.

[0039] In this embodiment, a portion of the guide roller 6 is located outside the U-shaped plate 5 to ensure that it is in full contact with the outer wall of the tube blank, thus forming an effective constraint.

[0040] As a technical optimization of this utility model, a protective box 14 located outside the motor 13 is installed on the outer wall of the drive frame 7.

[0041] In this embodiment, the protective box 14 seals and encloses the motor 13, thereby providing protection for the motor 13.

[0042] The working principle and usage process of this utility model are as follows: When it is necessary to adapt to tube blanks of different sizes, the extension distance of the servo electric telescopic rod 15 needs to be calculated according to the actual size of the tube blank. The output end of the servo electric telescopic rod 15 drives the U-shaped connecting frame 2 fixedly connected to it to move. The U-shaped connecting frame 2 drives the U-shaped plate 5 and the guide roller 6 to move synchronously through the connecting plate 4 until the guide roller 6 reaches the preset position. Then, the servo electric telescopic rod 15 locks the current position to ensure that the guide roller 6 is positioned stably. During this process, the sliding rod 16 installed on the outer wall of the U-shaped connecting frame 2 passes through the rectangular frame 1 and slides to it, providing linear guidance for the U-shaped connecting frame 2 and ensuring that there is no deviation during the movement process.

[0043] After the guide roller 6 is adjusted, the motor 13 starts and drives the first worm 10 to rotate. The first worm 10 drives the second worm 11 to rotate synchronously through the co-moving shaft 12, ensuring that the first worm 10 and the second worm 11 rotate at the same speed. Since the helical teeth of the first worm 10 and the second worm 11 are opposite in direction, the two worm wheels 9 that mesh with them respectively achieve opposite rotation. This rotation is transmitted to the steering shaft 3 through the transmission shaft 8, so that the two steering shafts 3 rotate synchronously in opposite directions. The steering shaft 3 drives the connecting plate 4 to deflect synchronously, thereby driving the U-shaped plate 5 and the guide roller 6 to achieve angle adjustment until the multiple guide rollers 6 are adjusted to the appropriate angle. The number of rotations of the motor 13 is preset by the actual size of the tube blank to ensure that the guide roller 6 deflects to the target angle. After the adjustment is completed, the self-locking characteristic of the transmission between the first worm 10 and the second worm 11 and the worm wheel 9 is used to lock the position of the steering shaft 3 to prevent the guide roller 6 angle from shifting on its own.

[0044] Through the above two-stage coordinated adjustment, this guide frame can dynamically adjust the position and angle of the guide roller 6 according to the size of the tube blank, ensuring that it is precisely tangent to the outer wall of the tube blank, effectively solving the problem of insufficient applicability and flexibility caused by the fixed guide roller 6 in traditional devices.

[0045] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A plastic film blow molding guide frame, comprising a rectangular frame (1), characterized in that: The rectangular frame (1) is provided with a material guiding mechanism. The material guiding mechanism includes four U-shaped connecting frames (2) located inside the rectangular frame (1) and arranged in a circular array. The U-shaped connecting frames (2) are provided with two symmetrically distributed connecting plates (4) extending to their outer sides. One end of each of the two connecting plates (4) is fixedly connected to a U-shaped plate (5). The interior of each of the two U-shaped plates (5) is rotatably connected to a guide roller (6). The rectangular frame (1) is provided with four angle adjustment mechanisms. The angle adjustment mechanism includes two steering shafts (3) rotatably connected to the inside of the U-shaped connecting frame (2). The two steering shafts (3) are fixedly connected to two connecting plates (4) respectively. The outer wall of the U-shaped connecting frame (2) is fixedly connected to a drive frame (7). One end of each of the two steering shafts (3) is fixedly connected to a transmission shaft (8) extending into the inside of the drive frame (7). The other end of each of the two transmission shafts (8) is fixedly connected to a worm gear (9). The outer walls of the two worm gears (9) are respectively meshed with a first worm (10) and a second worm (11) rotatably connected to the inside of the drive frame (7). The outer wall of the drive frame (7) is equipped with a motor (13) whose output end is fixedly connected to the first worm (10). The outer wall of the rectangular frame (1) is equipped with four servo electric telescopic rods (15), and the output ends of the four servo electric telescopic rods (15) are respectively fixedly connected to four U-shaped connecting frames (2).

2. The plastic film blow molding guide rack according to claim 1, characterized in that: A co-moving shaft (12) is fixedly connected between the first worm (10) and the second worm (11).

3. The plastic film blow molding guide frame according to claim 1, characterized in that: The helical teeth of the first worm (10) and the second worm (11) are in opposite directions.

4. The plastic film blow molding guide frame according to claim 1, characterized in that: Each of the four U-shaped connecting frames (2) has two slide rods (16) fixedly connected to its outer wall. The slide rods (16) pass through the rectangular frame (1) and are slidably connected to the rectangular frame (1).

5. A plastic film blow molding guide frame according to claim 1, characterized in that: The motor (13) is a servo motor.

6. The plastic film blow molding guide rack according to claim 1, characterized in that: A portion of the guide roller (6) is located on the outside of the U-shaped plate (5).

7. A plastic film blow molding guide frame according to claim 1, characterized in that: The outer wall of the drive frame (7) is fitted with a protective box (14) located outside the motor (13).

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