A blown film machine with automatic film thickness adjustment based on machine vision

Abstract

The present invention discloses a blown film machine based on automatic adjustment of film thickness by machine vision, belonging to the technical field of blown film machines, which includes a feeding machine, a blown film machine body, a frame, a film die gap adjustment mechanism, and a vision module. The feeding machine is located on one side of the frame and includes an extrusion mechanism and a hopper. The film die gap adjustment mechanism is installed on the blown film machine body and is used to adjust the film die gap. The vision module is installed on the annular track at the top of the frame and is used to detect the uniformity of the film thickness, transmit the collected information to the PLC, and then drive the film die gap adjustment mechanism to move. The blown film machine provided by the present invention has a simple structure, automatically adjusts the film die gap and the bubble opening position, solves the cumbersome and inaccurate disadvantages of manual adjustment based on experience, and greatly improves the efficiency of film production.

Description

Technical Field

[0001] The present invention belongs to the field of blown film machines, and specifically relates to a blown film machine with automatic film thickness adjustment based on machine vision. Background Art

[0002] A blown film machine is a device that heats plastic particles into a liquid and then blows out plastic films. Common products include garbage bags, food wraps, etc. Due to its cost-effective products, it has a wide range of applications in life.

[0003] With the increasing application of blown film machines, in order to improve production efficiency and reduce the rejection rate, enterprises pay more and more attention to the automation level of blown film machines. The factors affecting film forming quality mainly include the size of the air volume and the adjustment of the die gap. Currently, the die gap size and air volume are mainly adjusted by manually observing the bubble position and quality.

[0004] However, this method is very boring and cumbersome, consuming manpower and financial resources, and it is difficult to accurately control the adjustment amount manually, resulting in a decline in product quality and poor forming quality. Therefore, it is very necessary to explore a device that can automatically adjust the die gap. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art. Aiming at the problem of uneven cooling of the existing blown film machine, the present invention proposes a blown film machine with automatic film thickness adjustment based on machine vision, including:

[0006] A blown film machine body;

[0007] A winding mechanism for winding the processed plastic film;

[0008] A feeding device for conveying plastic particle raw materials to the blown film machine body;

[0009] An annular track for driving the camera to rotate. The annular track is located above the cooling air ring and is concentrically arranged with the cooling air ring. It is fixed on the frame by a track suspension rod. The track suspension rod passes through the inner ring of the annular track, enabling the annular track to be adjusted up and down;

[0010] A die gap adjustment mechanism for fine-tuning the die gap. The die gap adjustment mechanism includes an X-direction displacement stage and a Y-direction displacement stage. The two displacement stages are vertically connected. The fixing component of the Y-direction displacement stage is fixedly connected to the sliding component of the X-direction displacement stage, and the height of the sliding component is slightly higher than that of the fixing component;

[0011] A vision module for monitoring and identifying the formed profile, obtaining the image information of the outer profile of the plastic film, comparing it with the set reasonable profile, and transmitting the execution information to the PLC for control after being processed by the industrial control computer;

[0012] The track adjustment device is used to adjust the rotation of the track. The track adjustment device consists of a servo motor and a fine adjustment gear. The servo motor is connected to the PLC through a wiring port, and the PLC adjusts the rotation speed and rotation angle.

[0013] The present invention can solve the cumbersome manual operation, greatly improve the accuracy of the die gap adjustment, and can achieve fast, timely and accurate adjustment, so as to improve the production efficiency and the high-quality product rate. Description of the Drawings

[0014] Figure 1 is the front view of a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0015] Figure 2 is the perspective view of the top and bottom parts of a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0016] Figure 3 is the perspective view of the track suspension rod in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0017] Figure 4 is the schematic diagram of two different postures of the camera in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0018] Figure 5 is the schematic diagram of the track adjustment device in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0019] Figure 6 is the top view of the main components in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0020] Figure 7 is the perspective view of the die gap adjustment device in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0021] Figure 8 is the left view of the die gap adjustment device in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0022] Figure 9 is the top view of the die gap adjustment device in a blown film machine with automatic film thickness adjustment based on machine vision according to an embodiment of the present application;

[0023] Reference numerals: 1, winding roller; 2, winding frame; 3, film; 4, image acquisition card; 5, industrial control computer; 6, PLC; 7, frequency converter; 8, data transmission line; 9, fan; 10, air duct; 11, cooling air ring; 1101, air outlet; 12, bubble stabilizing rod; 13, film orifice gap adjusting mechanism; 1301, servo motor; 1302, X-direction displacement stage; 1303, Y-direction displacement stage; 1304, spring; 1305, support rod; 1306, die head hole; 1307, sliding component; 1308, fixing component; 14, blown film machine body; 1401, film orifice; 1402, outer ring of blown film machine; 1403, die head; 15, extrusion device; 16, barrel; 17, bubble stabilizing head; 18, bubble opening section; 19, forming section; 20, track adjusting device; 2001, wiring port; 2002, adjusting gear; 21, camera; 2101, optical lens; 2102, strong magnetic ball; 2103, spherical base; 2104, nut; 22, annular track; 2201, gear ring; 2202, cylindrical roller; 2203, inner ring of annular track; 23, track suspension rod; 2301, threaded sleeve; 2302, screw; 24, herringbone splint; 25, frame Detailed implementation manners

[0024] The following will further describe the present application in detail with reference to the appended Figures 1-9 drawings

[0025] The present invention and its implementation manners are described below. Such description is not restrictive, and the actual implementation manners are not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention

[0026] An embodiment of the present application discloses a blown film machine for automatically adjusting film thickness based on machine vision. Referring to Figure 1 Figure 2 and Figure 3 , a blown film machine for automatically adjusting film thickness based on machine vision includes a blown film machine body 14, a frame 25 and an annular track 22; a film orifice gap adjusting mechanism 13 is fixedly arranged on the periphery of the blown film machine body; the annular track 22 is concentrically arranged with the cooling air ring 11 and is fixed on the frame 25 through a track suspension rod 23; a herringbone splint 24 is arranged above the annular track 22 and is fixed on the frame 25; plastic particles in the barrel 16 are conveyed to the die head through an extrusion device 15; the cooling air ring 11 is connected to the fan 9 through 4 air ducts 10, and the PLC controls the air volume of the cooling air ring 11 through a control valve

[0027] Referring to Figure 4The optical lens 2101 is fixed to a connector with a strong magnetic ball 2102 at the other end through a nut 2104. The strong magnetic ball 2102 is covered by a spherical base 2103. The spherical base 2103 is connected to the ring gear 2201 through a nut 2104 and rotates with the ring gear 2201. The ring gear 2201 is driven by the track adjustment device 20 through gear meshing.

[0028] Reference Figures 6-9 The film mouth gap adjustment mechanism 13 is composed of an X-axis displacement platform 1302 and a Y-axis displacement platform 1303. The displacement platforms in the two directions are composed of the same. Taking the X-axis displacement platform 1302 as an example, cylindrical support rods 1305 are arranged on both sides of the displacement platform to serve as sliding tracks for the fixed component 1308. A circular die hole 1306 equal to the outer diameter of the die is arranged in the middle of the fixed component 1308. The die hole 1306 is engaged with the outer ring 1402 of the film blowing machine. The fixed component 1308 of the Y-axis displacement platform 1303 is welded on the sliding component 1307 of the X-axis fixed component. To ensure smooth movement, the sliding component 1307 is slightly higher than the fixed component 1308. For details, refer to Figure 8 It can be seen that the two ends of the sliding component 1307 are respectively a lead screw connected to the servo motor 1301 and a spring 1304 connected to the fixed component 1308. The lead screw and the sliding component 1307 are connected by threads. When the servo motor 1301 rotates forward, the lead screw pushes the sliding component 1307 to move in the positive direction of X, and the spring is compressed. At this time, the left side of the membrane opening 1401 becomes larger. When the servo motor 1301 reverses, the lead screw pushes the sliding component 1307 to move in the reverse direction of X, and the spring is extended. At this time, the right side of the membrane opening 1401 becomes larger. In order to ensure the tight connection and the timeliness of the reset of the translation stage, the other side of the sliding component 1307 is connected to the fixed component 1308 through the spring 1304.

[0029] The embodiment of the present application discloses a film blowing machine with automatic film thickness adjustment based on machine vision, and the implementation principle is as follows: the visual module identifies the size of the outer contour of the forming section, and the PLC compares it with the set reasonable contour after data processing by the industrial computer. The deviation of the outer contour line reflects the deviation of the film mouth gap; the PLC sends a control instruction to the film mouth gap adjustment mechanism to adjust the film mouth gap; at the same time, the image information collected by the camera reflects the height of the bubble opening position, and the PLC controls the air volume of the fan through the control valve, thereby controlling the height of the bubble opening position; the formed film discharges the internal air through the herringbone plywood, and is finally wound on the winding frame through a number of rollers.

Claims

1. A blown film machine based on automatic adjustment of film thickness by machine vision, comprising a film die gap adjustment mechanism, a blown film machine body, an orbit adjustment device, a camera, an annular orbit, and a vision module, characterized in that: The blown film machine body is fixed with a film die gap adjustment mechanism, and a cooling air ring is fixed on the film head. The air ring is connected to a fan through an air duct. The orbit adjustment device is located above the blown film machine body and drives the gear ring to rotate. The orbit adjustment device consists of a servo motor and a fine adjustment gear. The servo motor is connected to a PLC through a wiring port, and the PLC adjusts the rotation speed and rotation angle; The camera is installed on the gear ring of the annular orbit. The annular orbit is installed on the frame through an orbit suspension rod for driving the camera to rotate. The annular orbit is located above the cooling air ring and is concentric with the cooling air ring. The orbit suspension rod passes through the inner ring of the annular orbit so that the annular orbit can be adjusted up and down in position; The orbit suspension rod penetrates through the inner ring of the orbit ring. The film die gap adjustment mechanism includes an X-direction displacement table and a Y-direction displacement table, and the two displacement tables are vertically connected; The fixed component of the Y-direction displacement table is fixedly connected to the sliding component of the X-direction displacement table, and the height of the sliding component is slightly higher than that of the fixed component; Both ends of the displacement table are provided with support rods. The support rods are cylindrical. Circular through holes are opened at both ends of the sliding component and the fixed component. The support rods are installed in the through holes as sliding support tracks. One end of the sliding component and the fixed component is connected by a spring; The vision module is used for monitoring and identifying the formed profile, obtaining the image information of the outer profile of the plastic film, comparing it with the set reasonable profile, and transmitting the execution information to the PLC for control after being processed by the industrial control computer; the vision module identifies the size of the outer profile of the forming section. After being processed by the industrial control computer, the PLC compares it with the set reasonable profile. The deviation of the outer profile line reflects the deviation of the film die gap; the PLC issues a control instruction to the film die gap adjustment mechanism to adjust the film die gap; at the same time, the image information collected by the camera reflects the height of the bubble opening position. The PLC controls the air volume of the fan through a control valve, thereby controlling the height of the bubble opening position.

2. The blown film machine based on automatic film thickness adjustment by machine vision according to claim 1, wherein: A strong magnetic ball is provided at the end of the camera away from the lens, and the strong magnetic ball is magnetically attracted to the spherical base. The spherical base is fixed on the gear ring by a nut.

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