Downward blowing type unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement

Abstract

The utility model relates to a film blowing machine, in particular to a downward blowing type unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement, which comprises a rack, and a V-shaped plate, a drying mechanism, a deviation rectifying mechanism and a winding mechanism which are arranged on the rack and are sequentially arranged along the moving direction of a film, a thickness measuring mechanism is arranged between the drying mechanism and the deviation correcting mechanism, the thickness measuring mechanism is installed on the rack, and the thickness measuring mechanism is provided with a plurality of detection positions; and the control system establishes communication with the thickness measuring mechanism and an air supply unit of the cooling air ring and is used for controlling the air supply amount of the air supply unit to different air holes in the cooling air ring according to the detection information of the plurality of detection positions. The thickness of the thin film at different positions of the same width is detected through a plurality of detection positions in the thickness measuring mechanism, the thickness information is fed back to the control system, the control system controls the injection amount of different air holes in the cooling air ring in unit time, and therefore uniformity control over the thickness of the thin film is achieved.

Description

Technical Field

[0001] The utility model relates to a film blowing machine, in particular to a downward blowing single-direction rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement. Background Art

[0002] The film blowing machine is to add dry polyethylene particles into the lower hopper, and the particles enter the screw from the hopper by their own weight. When the particles come into contact with the bevel of the screw, the rotating bevel surface generates a thrust perpendicular to the bevel surface on the plastic, pushing the plastic particles forward. During the pushing process, the plastic gradually melts due to the friction between the plastic and the screw, the plastic and the barrel, the collision and friction between the particles, and the external heating of the barrel. The molten plastic is filtered through the die head to remove impurities and comes out from the die head. It is cooled by the air ring, blown, and rolled into a tube through the herringbone plate, traction roller, and winding.

[0003] However, when the film is cooled and inflated by the set air ring, the blowing force at one or some points of the air ring may change slightly, resulting in uneven thickness of the film after forming, affecting the production effect of the film. Utility Model Content

[0004] The utility model aims to provide a downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a downward-blowing unidirectional rotating multi-layer co-extrusion blown film machine based on air ring thickness measurement, comprising a frame and a V-shaped plate, a drying mechanism, a correction mechanism and a winding mechanism installed on the frame and arranged in sequence along the moving direction of the film; a thickness measuring mechanism is arranged between the drying mechanism and the correction mechanism, the thickness measuring mechanism is installed on the frame, and the thickness measuring mechanism is configured with multiple detection positions; a control system establishes communication with the thickness measuring mechanism and the air supply unit of the cooling air ring, and is used to control the amount of air supplied by the air supply unit to different air holes in the cooling air ring according to the detection information of the multiple detection positions.

[0006] The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement as described above: the thickness measuring mechanism includes: a support frame fixed on the frame and second guide rollers arranged on both sides of the support frame; and also includes a plurality of detection heads arranged on the inner side of the support frame and forming detection positions, and the detection heads establish communication with the control system.

[0007] As described above, the downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement: the V-shaped plate includes two symmetrically arranged inclined plates, and the inclined plates are connected to an adjustment mechanism installed on the frame, and the adjustment mechanism is used to adjust the placement angle of the inclined plates.

[0008] The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement as described above: the adjusting mechanism includes: a first adjusting unit and a second adjusting unit which are symmetrically arranged respectively, and the first adjusting unit and the second adjusting unit are distributed up and down along the vertical direction, wherein: the first adjusting unit includes a first screw rotatably mounted on the frame and a moving block slidably mounted on the frame and threadedly connected to the first screw, and the moving block is rotatably connected to the side end of the inclined plate through a connecting rod rotatably connected thereto; the second adjusting unit includes a threaded sleeve rotatably mounted on the frame and a second screw penetrating the threaded sleeve and threadedly connected to the threaded sleeve, and one end of the second screw is rotatably connected to the connecting block rotatably mounted on the inclined plate.

[0009] The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement as described above: the drying mechanism includes: two symmetrically arranged ovens, and a gap for the film to pass through is formed between the opposite surfaces of the two ovens; it also includes a second mounting frame fixed to the frame, and two strip mounting holes are formed on the second mounting frame. Bolts passing through the strip mounting holes are connected to the ovens to fix the ovens to the second mounting frame.

[0010] The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement as described above: the deviation correction mechanism includes: a first mounting frame fixed on the frame and a fixed frame fixed on the first mounting frame; a rotating support frame, on which at least two first guide rollers are rotatably mounted along the moving direction of the film, the rotating support frame is rotatably mounted on the fixed frame and connected to a driving member mounted on the fixed frame; a detection unit, which establishes communication with the driving member.

[0011] The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement as described above: the driving part includes: a first connecting frame fixedly connected to the rotating support frame and a second connecting frame fixedly connected to the fixed frame; and also includes an electric telescopic rod, the fixed end of the electric telescopic rod is hinged to the second connecting frame, and the movable end of the electric telescopic rod is hinged to the first connecting frame.

[0012] The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement as described above: the downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement also includes a base, the frame is rotatably mounted on the base and is connected to a rotating drive mechanism mounted on the base.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the thickness of the film at different positions on the same width of the film is detected by setting up multiple detection positions in the thickness measuring mechanism, and the thickness information is fed back to the control system. The control system controls the blowing volume per unit time of different air holes in the cooling air ring, thereby realizing the uniformity control of the film thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a downward-blowing single-direction rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement;

[0015] Figure 2 It is a front view of a downward-blowing single-direction rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement;

[0016] Figure 3 It is a structural schematic diagram of the thickness measuring mechanism in a downward-blowing single-direction rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement;

[0017] Figure 4 It is a schematic diagram of the connection state of the V-shaped plate and the adjustment mechanism in the downward-blowing single-direction rotating multi-layer co-extrusion film blowing machine based on the air ring thickness measurement;

[0018] Figure 5 for Figure 2 A magnified view of the structure at center A;

[0019] Figure 6 It is a structural schematic diagram of the deviation correction mechanism in a downward-blowing single-direction rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement;

[0020] Figure 7 This is a structural schematic diagram of another angle of the correction mechanism in the downward-blowing single-direction rotating multi-layer co-extrusion blown film machine based on air ring thickness measurement.

[0021] In the figure: 1-frame, 2-base, 3-winding mechanism, 4-V-plate, 5-correcting mechanism, 501-first mounting frame, 502-rotating support frame, 503-first guide roller, 504-detection unit, 505-fixed frame, 506-first connecting frame, 507-electric telescopic rod, 508-second connecting frame, 6-drying mechanism, 601-oven, 602-second mounting frame, 603-strip mounting hole, 7-rotating drive mechanism, 8-adjusting mechanism, 801-first screw, 802-moving block, 803-connecting rod, 804-second screw, 805-threaded sleeve, 806-connecting block, 9-thickness measuring mechanism, 901-support frame, 902-second guide roller, 903-detection head. DETAILED DESCRIPTION

[0022] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0023] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0024] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0025] See also Figure 1-Figure 2 In an embodiment of the utility model, a down-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement includes a frame 1 and a base 2, the frame 1 is rotatably mounted on the base 2 and connected to a rotating driving mechanism 7 mounted on the base 2, a V-shaped plate 4, a drying mechanism 6, a deviation correction mechanism 5 and a winding mechanism 3 are sequentially arranged on the frame 1 along the moving direction of the film; a thickness measuring mechanism 9 is arranged between the drying mechanism 6 and the deviation correction mechanism 5, the thickness measuring mechanism 9 is installed on the frame 1, and the thickness measuring mechanism 9 is configured with multiple detection positions; a control system establishes communication with the thickness measuring mechanism 9 and the air supply unit of the cooling air ring, and is used to control the amount of air supplied by the air supply unit to different air holes in the cooling air ring according to the detection information of the multiple detection positions.

[0026] In this embodiment, the film thickness at different positions on the same width of the film is detected by multiple detection positions in the thickness measuring mechanism 9, and the thickness information is fed back to the control system. The control system controls the blowing volume per unit time of different air holes in the cooling air ring, thereby achieving uniformity control of the film thickness.

[0027] In detail, taking the cooling air ring with 48 points as an example, an air supply unit (preferably a fan) is connected to the cooling air ring, and the air supply unit is diverted by the 48 points of the cooling air ring. A valve is installed on each of the air pipes, that is, there are 48 valves corresponding to the 48 detection positions. When one of the detection positions detects that the thickness of the film at the current position is large, the control system controls the corresponding valve to increase the opening and closing degree, thereby increasing the wind force corresponding to the current position at the cooling air ring, thereby reducing the thickness of the film to achieve adjustment of the uniformity of the film thickness.

[0028] For further information, see Figure 1 and Figure 3 The thickness measuring mechanism 9 includes a support frame 901 fixed on the frame 1 and second guide rollers 902 arranged on both sides of the support frame 901, and also includes a plurality of detection heads 903 arranged on the inner side of the support frame 901 and forming detection positions, and the detection heads 903 establish communication with the control system.

[0029] In this embodiment, the optical interference method is adopted, and the optical interference principle is utilized to calculate the thickness of the film by measuring the phase difference of the reflected light. After light waves of different wavelengths penetrate the sample film layer, the phase difference of the reflected light depends on the thickness and refractive index of the film. The thickness of the film is obtained by analyzing the interference pattern.

[0030] Of course, in the specific implementation process, the X-ray absorption method can also be used. X-rays are used to pass through the film and the intensity of the transmitted X-rays is measured. Films of different thicknesses will absorb different amounts of X-rays. The thickness of the film can be inferred by measuring the intensity of the transmitted X-rays.

[0031] For further information, see Figure 4 The V-shaped plate 4 includes two symmetrically arranged inclined plates, which are connected to an adjusting mechanism 8 installed on the frame 1, and the adjusting mechanism 8 is used to adjust the placement angle of the inclined plate. Exemplarily, in one embodiment, the adjusting mechanism 8 includes: a first adjusting unit and a second adjusting unit that are symmetrically arranged, and the first adjusting unit and the second adjusting unit are distributed up and down along the vertical direction, wherein: the first adjusting unit includes a first screw 801 rotatably mounted on the frame 1 and a moving block 802 slidably mounted on the frame 1 and threadedly connected to the first screw 801, and the moving block 802 is rotatably connected to the side end of the inclined plate through a connecting rod 803 rotatably connected thereto; the second adjusting unit includes a threaded sleeve 805 rotatably mounted on the frame 1 and a second screw 804 that penetrates the threaded sleeve 805 and is threadedly connected to the threaded sleeve 805, and one end of the second screw 804 is rotatably connected to a connecting block 806 rotatably mounted on the inclined plate.

[0032] The first adjustment unit cooperates with the second adjustment unit to achieve angle adjustment of the two inclined plates, that is, to achieve adjustment of the angle of the V-shaped plate 4. The specific adjustment method includes: rotating the first screw 801, thereby driving the moving block 802 to move horizontally, and when the moving block 802 moves, the inclined plate is driven to rotate and adjust through the action of the connecting rod 803, and the second screw 804 is rotated, and the connecting block 806 follows the movement of the second screw 804 under the action of the threaded sleeve 805, so as to drive the inclined plate to rotate and adjust.

[0033] See also Figure 2 and Figure 5 The drying mechanism 6 includes two symmetrically arranged ovens 601, and a gap is formed between the opposite surfaces of the two ovens 601 for the film to pass through; it also includes a second mounting frame 602 fixed to the frame 1, and two strip mounting holes 603 are formed on the second mounting frame 602. Bolts passing through the strip mounting holes 603 are connected to the ovens 601 to fix the ovens 601 and the second mounting frame 602.

[0034] Since there is water flow in the V-shaped plate 4, moisture adheres to the film removed from the V-shaped plate 4. Therefore, the two ovens 601 can effectively dry both sides of the film simultaneously to eliminate the problem of film damage caused by moisture between the films after winding.

[0035] At the same time, in order to achieve effective drying of films of different thicknesses, the distance between the two ovens 601 is changed by changing the position of the oven 601 on the second mounting frame 602, thereby preventing the film from being deformed due to the oven 601 being too close to the film.

[0036] See also Figure 1 , Figure 6 and Figure 7 The correcting mechanism 5 includes a first mounting frame 501 fixed on the frame 1 and a fixed frame 505 fixed on the first mounting frame 501; a rotating support frame 502, on which at least two first guide rollers 503 are rotatably mounted along the moving direction of the film, the rotating support frame 502 is rotatably mounted on the fixed frame 505 and is connected to a driving member mounted on the fixed frame 505; a detection unit 504 establishes communication with the driving member. Exemplarily, in one embodiment, the driving member includes a first connecting frame 506 fixedly connected to the rotating support frame 502 and a second connecting frame 508 fixedly connected to the fixed frame 505, and also includes an electric telescopic rod 507, the fixed end of the electric telescopic rod 507 is hinged to the second connecting frame 508, and the movable end of the electric telescopic rod 507 is hinged to the first connecting frame 506.

[0037] When the detection unit 504 detects that the film is deflected, the electric telescopic rod 507 is actuated to drive the rotating support frame 502 to rotate relative to the fixed frame 505 through the first connecting frame 506, and at the same time drive the two first guide rollers 503 to deflect, thereby realizing the deviation correction operation of the film.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement, comprising a frame (1) and a V-shaped plate (4), a drying mechanism (6), a deviation correction mechanism (5) and a winding mechanism (3) which are mounted on the frame (1) and arranged in sequence along the film moving direction; characterized in that: A thickness measuring mechanism (9) is provided between the drying mechanism (6) and the deviation correcting mechanism (5), the thickness measuring mechanism (9) being mounted on the frame (1), and the thickness measuring mechanism (9) being provided with a plurality of detection positions; a control system establishing communication with the thickness measuring mechanism (9) and an air supply unit of the cooling air ring, and being used for controlling the amount of air supplied by the air supply unit to different air holes in the cooling air ring according to detection information of the plurality of detection positions.

2. A downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement according to claim 1, characterized in that: The thickness measuring mechanism (9) comprises: a support frame (901) fixed on the frame (1) and second guide rollers (902) arranged on both sides of the support frame (901); and also comprises a plurality of detection heads (903) arranged on the inner side of the support frame (901) and forming detection positions, wherein the detection heads (903) establish communication with the control system.

3. A downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement according to claim 1, characterized in that: The V-shaped plate (4) comprises two symmetrically arranged inclined plates, the inclined plates being connected to an adjustment mechanism (8) mounted on the frame (1), the adjustment mechanism (8) being used to adjust the placement angle of the inclined plates.

4. A downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement according to claim 3, characterized in that: The adjustment mechanism (8) comprises: a first adjustment unit and a second adjustment unit which are symmetrically arranged respectively, and the first adjustment unit and the second adjustment unit are distributed vertically up and down, wherein: the first adjustment unit comprises a first screw rod (801) rotatably mounted on the frame (1) and a moving block (802) slidably mounted on the frame (1) and threadedly connected to the first screw rod (801), and the moving block (802) is rotatably connected to the side end of the inclined plate via a connecting rod (803) rotatably connected thereto; the second adjustment unit comprises a threaded sleeve (805) rotatably mounted on the frame (1) and a second screw rod (804) penetrating the threaded sleeve (805) and threadedly connected to the threaded sleeve (805), and one end of the second screw rod (804) is rotatably connected to a connecting block (806) rotatably mounted on the inclined plate.

5. The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement according to claim 1, characterized in that: The drying mechanism (6) comprises: two symmetrically arranged ovens (601), with a gap formed between the opposing surfaces of the two ovens (601) for the film to pass through; and a second mounting frame (602) fixed to the frame (1), with two strip-shaped mounting holes (603) formed on the second mounting frame (602), and bolts passing through the strip-shaped mounting holes (603) connected to the ovens (601) to fix the ovens (601) to the second mounting frame (602).

6. The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement according to claim 1, characterized in that: The deviation correction mechanism (5) comprises: a first mounting frame (501) fixed on the frame (1) and a fixed frame (505) fixed on the first mounting frame (501); a rotating support frame (502) on which at least two first guide rollers (503) are rotatably mounted along the moving direction of the film, the rotating support frame (502) being rotatably mounted on the fixed frame (505) and connected to a driving member mounted on the fixed frame (505); and a detection unit (504) establishing communication with the driving member.

7. A downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on air ring thickness measurement according to claim 6, characterized in that: The driving member comprises: a first connecting frame (506) fixedly connected to the rotating support frame (502) and a second connecting frame (508) fixedly connected to the fixed frame (505); and also comprises an electric telescopic rod (507), wherein a fixed end of the electric telescopic rod (507) is hinged to the second connecting frame (508), and a movable end of the electric telescopic rod (507) is hinged to the first connecting frame (506).

8. The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement according to claim 1, characterized in that: The downward-blowing unidirectional rotating multi-layer co-extrusion film blowing machine based on wind ring thickness measurement further comprises a base (2), and the frame (1) is rotatably mounted on the base (2) and connected to a rotating drive mechanism (7) mounted on the base (2).

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