Film blowing machine for packaging plastic products

Abstract

The invention belongs to the technical field of film blowing machines, and particularly relates to a film blowing machine for plastic product packaging. The device comprises a bottom frame, a screw extruder and a die head device, wherein a feeding hopper is arranged at one end of the screw extruder; an annular film outlet is formed in the die head device, a film lifting mechanism is connected to the die head device, and the film lifting mechanism comprises an annular frame and film drawing robots evenly installed on the annular frame; the film drawing robot comprises a base, a fixed arm is fixedly connected to the base, a first rotating arm is rotationally connected to the fixed arm, and a second rotating arm is rotationally connected to the tail end of the first rotating arm; a V-shaped rotating frame is rotationally connected to the tail end of the second rotating arm, a clamping air cylinder is fixedly connected to the rotating frame, a guide rod is fixedly connected to the center of the die head device, and a lifting mechanism matched with the film drawing robot is connected to the guide rod; the film is pulled out from the film outlet through the film pulling robot, so that the pulling force of the film is uniform and stable, the probability of film breakage is reduced, and the film lifting efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of film blowing machines, in particular to a film blowing machine for packaging plastic products. Background Art

[0002] A film blowing machine heats and melts plastic particles before blowing them into thin films. There are many types of film blowing machines, including those for PE, POF, PVC, and PVDC. Brand-new particles are blown out to create new material with uniform color, clean texture, and good bag stretch. The machine primarily consists of an extruder, die head, die head, cooling device, bubble stabilization rack, herringbone plate, traction rollers, and a take-up device. The film blowing die head is a crucial component of film production equipment, directly impacting the quality of the film produced. Most existing film blowing dies consist of a mold shell, a spiral, and a die ring. The spiral is placed within the mold shell, which is then fitted onto the die ring. A spiral groove is defined along the side of the spiral along its axial direction, and a feed channel connected to the spiral groove is located at the bottom of the spiral. The melt enters the spiral groove from the feed channel and spirals up along the spiral groove to the discharge channel between the spiral and the die ring, where it is blown by air to form a film.

[0003] At present, the film blowing machine die head is generally done manually when the film is removed. The worker at the bottom slowly pulls the film out of the die mouth, pulls it upward, and then hands it over to the worker above to pull the film away. This requires the cooperation of multiple people and the operation is relatively troublesome. In addition, manual film removal will continuously tear the film, resulting in low film removal efficiency. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a film blowing machine for plastic product packaging. By installing a film-lifting mechanism on the die head device, the film can be automatically lifted and transferred to the personnel above, overcoming the shortcomings of the existing film blowing machine's low efficiency in manual film lifting, and aims to solve the problems in the background technology.

[0005] In order to achieve the above-mentioned technical objectives, the specific technical scheme of the present invention is as follows: the film blowing machine for plastic product packaging proposed in the present invention includes a base frame, a screw extruder and a die head device, and a feed hopper is provided at one end of the screw extruder; the die head device is provided with an annular film outlet, and the die head device is connected to a film-pulling mechanism, the film-pulling mechanism includes an annular frame and a plurality of film-pulling robots evenly installed on the annular frame, which are used to pull the film out of the film outlet; the film-pulling robot includes a base, a fixed arm is fixedly connected to the base, a first rotating arm is rotatably connected to the fixed arm, and a second rotating arm is rotatably connected to the end of the first rotating arm; the end of the second rotating arm is rotatably connected to a V-shaped rotating frame, and a clamping cylinder is fixedly connected to the rotating frame for clamping the film; and a guide rod is fixedly connected to the center of the die head device, and a lifting mechanism cooperating with the film-pulling robot is connected to the guide rod, and the lifting mechanism is used to drive the film to rise.

[0006] As a preferred technical solution of the present invention, a driving roller is rotatably connected to the rotating frame for driving the film to be transported; and a micro motor is installed on the rotating frame for driving the driving roller to rotate.

[0007] As a preferred technical solution of the present invention, a pair of arc-shaped clamping plates are connected to the clamping cylinder; and an airflow sensor is installed on the second rotating arm.

[0008] As a preferred technical solution of the present invention, the lifting mechanism includes a lifting frame, which is slidably connected to the guide rod. The lifting frame is rotatably connected to a rotating roller that corresponds to the driving roller one by one, and the film passes between the driving roller and the rotating roller.

[0009] As a preferred technical solution of the present invention, a first pressure ring is fixedly connected to the lifting frame, and a second pressure ring that cooperates with the first pressure ring is connected above the lifting frame. The first pressure ring and the second pressure ring are used to press and fix the film.

[0010] As a preferred technical solution of the present invention, a retaining ring is provided above the second pressure ring to limit the position of the film.

[0011] As a preferred technical solution of the present invention, a lifting cylinder is installed on the lifting frame, which is used to drive the second pressure ring to lift and lower; and a driving motor is fixedly installed on the lifting frame, and a driving wheel is fixedly connected to the driving motor shaft, and the driving wheel is in contact with the surface of the guide rod.

[0012] As an optimal technical solution of the present invention, a first servo motor is installed on the fixed arm to drive the first rotating arm to rotate; a second servo motor is installed on the first rotating arm to drive the second rotating arm to rotate; and a rotating motor is installed on the second rotating arm to drive the rotating frame to rotate.

[0013] As a preferred technical solution of the present invention, the die head device is provided with multiple heating sleeves on its circumference, and the die head device is connected to multiple air pipes, which are connected to an external fan; the die head device is connected to multiple adjusting bolts on its circumference.

[0014] As a preferred technical solution of the present invention, a limiting convex strip is provided on the surface of the guide rod.

[0015] The beneficial effects of the present invention are: 1. The film-lifting mechanism of the present invention is equipped with multiple film-pulling robots. The film-pulling robots pull the film out of the film outlet, so that the film pulling force is uniform and stable, reducing the probability of film rupture. In addition, through the cooperation between the film-pulling robots and the lifting mechanism, the lifting mechanism drives the film to rise and transfers the film to the personnel above, thereby improving the efficiency of film lifting.

[0016] 2. The film-stretching robot of the present invention is provided with a first rotating arm and a second rotating arm. The second rotating arm is provided with an airflow sensor, which can be used to monitor whether the film is broken. The second rotating arm is provided with a rotating frame, and the rotating frame is connected to a driving roller and a clamping cylinder. The driving roller presses on the lifting mechanism. When the film is broken, the film-stretching robot at the corresponding position can pull the film out from the film outlet again, ensuring that the film is normally stretched. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the film blowing machine for plastic product packaging of the present invention.

[0018] Figure 2 It is a front view schematic diagram of the film blowing machine for packaging plastic products of the present invention.

[0019] Figure 3 This is a schematic structural diagram of the die head device proposed in the present invention.

[0020] Figure 4 This is a schematic structural diagram of the film-stretching robot proposed in the present invention.

[0021] Figure 5 This is a schematic diagram from another angle of the film-stretching robot proposed in the present invention.

[0022] Figure 6 This is a structural schematic diagram of the lifting mechanism proposed in the present invention.

[0023] Figure 7 This is a schematic diagram from another angle of the lifting mechanism proposed by the present invention.

[0024] The corresponding names of the reference numerals in the figures are as follows: 1. chassis; 2. screw extruder; 21. feed hopper; 3. die head device; 31. film outlet; 32. guide rod; 33. air pipe; 34. heating jacket; 35. adjusting bolt; 36. limiting rib; 4. film lifting mechanism; 41. film pulling robot; 411. base; 412. fixed arm; 413. first rotating arm; 414. second rotating arm; 415. rotating frame; 416. Clamping cylinder; 417, clamping plate; 418, driving roller; 419, first servo motor; 4110, second servo motor; 4111, rotating motor; 4112, micro motor; 4113, air flow sensor; 42, ring frame; 5, lifting mechanism; 51, lifting frame; 52, rotating roller; 53, first pressure ring; 54, second pressure ring; 55, lifting cylinder; 56, driving motor; 57, driving wheel; 58, retaining ring. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] This embodiment discloses a film blowing machine for packaging plastic products. Figure 1-Figure 7 As shown, it includes a base frame 1, a screw extruder 2 and a die head device 3, and a feed hopper 21 is provided at one end of the screw extruder 2; the die head device 3 is provided with an annular film outlet 31, and the die head device 3 is connected to a film pulling mechanism 4, which includes an annular frame 42 and a plurality of film pulling robots 41 evenly installed on the annular frame 42, for pulling the film out of the film outlet 31; wherein, the number of film pulling robots 41 is set to 4-6, and this embodiment is provided with 4; the film is evenly pulled out by four film pulling robots 41, so that the film is subjected to uniform and stable force, reducing the probability of film rupture; wherein, the die head device 3 is provided with a plurality of heating sleeves 34 on the periphery, for heating and melting the plastic, and the die head device 3 is connected to a plurality of air pipes 33, and the air pipes 33 are connected to an external fan; the die head device 3 is connected to a plurality of adjusting bolts 35 on the periphery, and the adjusting bolts 35 are used to adjust the size of the film outlet 31 to control the uniform thickness of the film.

[0027] like Figure 4-Figure 5As shown, the film-pulling robot 41 includes a base 411, which is fixedly connected to the annular frame 42, a fixed arm 412 fixedly connected to the base 411, a first rotating arm 413 rotatably connected to the fixed arm 412, a first servo motor 419 installed on the fixed arm 412, for driving the first rotating arm 413 to rotate; the end of the first rotating arm 413 is rotatably connected to the second rotating arm 414, the first rotating arm 413 is installed with a second servo motor 4110, for driving the second rotating arm 414 to rotate; the end of the second rotating arm 414 is rotatably connected to a V-shaped rotating frame 415, and the second rotating arm 414 is installed with a rotating motor 4111, for driving the rotating frame 415 to rotate, the rotating frame 415 is fixedly connected to a clamping cylinder 416 for clamping the film, and the clamping cylinder 416 is connected to a pair of arc-shaped clamping plates 417; when clamping the film, Through the movement of the first rotating arm 413 and the second rotating arm 414, the clamping cylinder 416 is controlled to move to the position of the film outlet 31 to clamp the film, and then the film is slowly pulled out through the slow rotation of the first rotating arm 413 and the second rotating arm 414; a driving roller 418 is rotatably connected to the rotating frame 415 for pressing and conveying the film; a micro motor 4112 is installed on the rotating frame 415 for driving the driving roller 418 to rotate; further, an air flow sensor 4113 is installed on the second rotating arm 414, and the air flow sensor 4113 can be used to monitor whether the film is broken; if the film is broken somewhere, air is blown out from the broken part of the film, and the air flow sensor 4113 detects the air flow, and the control system controls the film pulling robot 41 corresponding to the broken part to move, driving the clamping cylinder 416 to move to the position of the film outlet 31 to stretch and pull the film out again.

[0028] like Figure 3 、 Figure 6 and Figure 7As shown, the center of the die head device 3 is fixedly connected to a guide rod 32, and the guide rod 32 is connected to a lifting mechanism 5 that cooperates with the film-stretching robot 41. The surface of the guide rod 32 is provided with a limiting ridge 36, which makes the lifting mechanism 5 stable. The lifting mechanism 5 is used to drive the film to rise and transfer the film to the personnel above so that the film can be pulled and transported; wherein, the lifting mechanism 5 includes a lifting frame 51, which is slidably connected to the guide rod 32, and the lifting frame 51 is rotatably connected to a rotating roller 52 that corresponds to the driving roller 418 on the circumference. , the film passes between the driving roller 418 and the rotating roller 52; when the film-stretching robot 41 pulls the film to the position of the lifting mechanism 5, the rotating frame 415 is driven to rotate by the rotating motor 4111, so that the driving roller 418 presses the film tightly against the surface of the rotating roller 52. At this time, the clamping cylinder 416 is above the driving roller 418. When a rupture occurs somewhere in the film, the film-stretching robot 41 at the corresponding position will re-grip and stretch the film. During the stretching process, the driving rollers 418 on the other several film-stretching robots 41 rotate, driving the film synchronously Movement; wherein, a first pressure ring 53 is fixedly connected to the lifting frame 51, and a second pressure ring 54 cooperating with the first pressure ring 53 is connected above the lifting frame 51, and the first pressure ring 53 and the second pressure ring 54 are used to press and fix the film, wherein a retaining ring 58 is provided above the second pressure ring 54 to limit the position of the film; when the driving roller 418 drives the film to be transported upward, the retaining ring 58 and the clamping cylinder 416 limit the position of the film, so that the film is stacked to the middle position of the first pressure ring 53 and the second pressure ring 54; further, the lifting frame 51 is fixedly connected to the lifting frame 51, and a second pressure ring 54 is connected above the lifting frame 51 to cooperate with the first pressure ring 53. The first pressure ring 53 and the second pressure ring 54 are used to press and fix the film, wherein, a retaining ring 58 is provided above the second pressure ring 54 to limit the position of the film; when the driving roller 418 drives the film to be transported upward, the retaining ring 58 and the clamping cylinder 416 limit the position of the film, so that the film is stacked to the middle position of the first pressure ring 53 and the second pressure ring 54 A lifting cylinder 55 is installed, which is used to drive the second pressure ring 54 to rise and fall, and press the film between the first pressure ring 53 and the second pressure ring 54; and a driving motor 56 is fixedly installed on the lifting frame 51, and a driving wheel 57 is fixedly connected to the rotating shaft of the driving motor 56, and the driving wheel 57 is in contact with the surface of the guide rod 32; the driving wheel 57 is driven by the driving motor 56 to rotate, and the lifting mechanism 5 is driven to rise along the guide rod 32, and the film is transported to the upper position and handed over to the workers above, so that the workers above can subsequently stretch and reel the film.

[0029] Working principle: In this embodiment, when the film is being stretched, the four film-stretching robots 41 move synchronously, clamp the film at the film outlet 31 through the clamping cylinder 416, pull the film out from the film outlet 31 evenly and stably, and drive the film to the position of the lifting mechanism 5, and then drive the rotating frame 415 to rotate through the rotating motor 4111, drive the driving roller 418 to press the film tightly against the surface of the rotating roller 52, and drive the driving roller 418 to rotate through the micro motor 4112 to transport the film; if the film breaks during the stretching process, the film-stretching robot 41 at the corresponding position will drive the clamping cylinder 416 to move back to the film outlet 31, clamp the film again, and stretch the film again. During the stretching process, the driving rollers 418 on the other film-stretching robots 41 rotate synchronously, driving the film to rise synchronously until the film-stretching robot 41 brings The film at the dynamic rupture point is stretched onto the rotating roller 52 and is pressed against the film by the driving roller 418; then the driving roller 418 drives the film to be transported upward, and the film is limited between the first pressure ring 53 and the second pressure ring 54 by the limiting ring 58, and then the second pressure ring 54 is driven to rise and fall by the lifting cylinder 55, and the film is pressed between the first pressure ring 53 and the second pressure ring 54; the driving motor 56 drives the driving wheel 57 to rotate, and drives the lifting mechanism 5 to rise along the guide rod 32, transporting the film to the upper position and handing it over to the workers above, so that the workers above can subsequently stretch and rewind the film, thereby completing the automatic film stretching; compared with manual film stretching, the film stretching mechanism 4 in this embodiment can stretch the film evenly and stably, reduce the probability of film rupture, and can hand over the film to the workers above, reducing labor costs and improving film stretching efficiency.

[0030] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A film blowing machine for packaging plastic products, comprising a base frame (1), a screw extruder (2) and a die head device (3), wherein a feed hopper (21) is provided at one end of the screw extruder (2); characterized in that: The die head device (3) is provided with an annular film outlet (31), and the die head device (3) is connected to a film pulling mechanism (4), the film pulling mechanism (4) comprising an annular frame (42) and a plurality of film pulling robots (41) evenly mounted on the annular frame (42), for pulling the film out of the film outlet (31); The film-drawing robot (41) comprises a base (411), a fixed arm (412) is fixedly connected to the base (411), a first rotating arm (413) is rotatably connected to the fixed arm (412), and a second rotating arm (414) is rotatably connected to the end of the first rotating arm (413); The end of the second rotating arm (414) is rotatably connected to a V-shaped rotating frame (415), and the rotating frame (415) is fixedly connected to a clamping cylinder (416) for clamping the film; The center of the die head device (3) is fixedly connected to a guide rod (32), and the guide rod (32) is connected to a lifting mechanism (5) that cooperates with the film-drawing robot (41), and the lifting mechanism (5) is used to drive the film to rise.

2. The film blowing machine for plastic product packaging according to claim 1, characterized in that: The rotating frame (415) is rotatably connected to a driving roller (418) for driving the film to be transported; and a micro motor (4112) for driving the driving roller (418) to rotate is installed on the rotating frame (415).

3. The film blowing machine for plastic product packaging according to claim 2, characterized in that: A pair of arc-shaped clamping plates (417) are connected to the clamping cylinder (416); and an airflow sensor (4113) is installed on the second rotating arm (414).

4. The film blowing machine for plastic product packaging according to claim 3, characterized in that: The lifting mechanism (5) includes a lifting frame (51), the lifting frame (51) is slidably connected to the guide rod (32), and the lifting frame (51) is rotatably connected to a rotating roller (52) corresponding to the driving roller (418) on the circumference, and the film passes between the driving roller (418) and the rotating roller (52).

5. The film blowing machine for plastic product packaging according to claim 4, characterized in that: A first pressure ring (53) is fixedly connected to the lifting frame (51), and a second pressure ring (54) that cooperates with the first pressure ring (53) is connected above the lifting frame (51). The first pressure ring (53) and the second pressure ring (54) are used to press and fix the film.

6. The film blowing machine for plastic product packaging according to claim 5, characterized in that: A retaining ring (58) is provided above the second pressure ring (54) for limiting the position of the film.

7. The film blowing machine for plastic product packaging according to claim 6, characterized in that: The lifting frame (51) is provided with a lifting cylinder (55) for driving the second pressure ring (54) to move up and down. A driving motor (56) is fixedly installed on the lifting frame (51), and a driving wheel (57) is fixedly connected to the rotating shaft of the driving motor (56). The driving wheel (57) is in surface contact with the guide rod (32).

8. The film blowing machine for plastic product packaging according to claim 7, characterized in that: A first servo motor (419) is mounted on the fixed arm (412) for driving the first rotating arm (413) to rotate; a second servo motor (4110) is mounted on the first rotating arm (413) for driving the second rotating arm (414) to rotate; and a rotating motor (4111) is mounted on the second rotating arm (414) for driving the rotating frame (415) to rotate.

9. The film blowing machine for plastic product packaging according to claim 8, characterized in that: The die head device (3) is provided with a plurality of heating sleeves (34) on its circumference, and the die head device (3) is connected to a plurality of air pipes (33), which are connected to an external blower; and the die head device (3) is connected to a plurality of adjusting bolts (35) on its circumference.

10. The film blowing machine for plastic product packaging according to claim 9, characterized in that: The surface of the guide rod (32) is provided with a limiting convex strip (36).

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