Polycarbonate film extrusion crosshatch double detection apparatus

Abstract

The present application relates to a kind of polycarbonate film extrusion cross grain double detection equipment, including rack, the upper guide roller and lower guide roller are arranged on the rack, the upper guide roller and lower guide roller are all connected with rack movably by bearing;Laser refraction detection mechanism and turnover angle detection mechanism are arranged on the rack, the laser refraction detection mechanism is specifically located at the position between adjacent upper guide roller and lower guide roller, the turnover angle detection mechanism is specifically located above upper guide roller;The laser refraction detection mechanism includes laser emitter and laser receiver;The turnover angle detection mechanism includes turnover plate, wafer, tension spring and displacement sensor.The present application utilizes laser refraction and mechanical contact turnover, to carry out double detection to cross grain on polycarbonate film, can detect the cross grain of waveform amplitude greater and smaller, reduce the probability of cross grain not being detected that waveform amplitude is not obvious.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of polycarbonate film detection, and particularly relates to a polycarbonate film extrusion cross grain double detection equipment. BACKGROUND

[0002] Polycarbonate is not suitable for blowing film and biaxial stretching due to its properties, and its film processing mode is mainly calendering and casting process, especially calendering.

[0003] Due to the extrusion effect of the roller, continuous extrusion lines can be easily formed on the surface of the polycarbonate sheet in the transverse direction, which is called gear lines, also known as cross lines.

[0004] The existence of cross lines can cause surface defects of transparent polycarbonate sheet in subsequent printing and other processing processes, thereby affecting its use. Therefore, at the end of the polycarbonate film production and processing, it is necessary to detect whether the constant temperature appears on the polycarbonate film.

[0005] The existing technology for detecting cross lines on polycarbonate film is the Chinese utility model patent with application number 201721803411.X and publication number CN207894850U, named "High-transparency polycarbonate sheet cross line online detection device", which discloses the following technology: "A high-transparency polycarbonate sheet cross line online detection device, comprising a high-transparency polycarbonate sheet cross line online detection device main body, a high-transparency polycarbonate sheet cross line online detection device conveyor, a heat sink, an image receiver, a control panel, a connector, a pulley and a high-transparency polycarbonate sheet cross line online detection device housing, the middle part of the high-transparency polycarbonate sheet cross line online detection device main body is provided with the high-transparency polycarbonate sheet cross line online detection device housing, the high-transparency polycarbonate sheet cross line online detection device housing is fixedly connected with the high-transparency polycarbonate sheet cross line online detection device main body, the inside of the high-transparency polycarbonate sheet cross line online detection device housing is provided with the high-transparency polycarbonate sheet cross line online detection device conveyor, the high-transparency polycarbonate sheet cross line online detection device conveyor is movably connected with the high-transparency polycarbonate sheet cross line online detection device housing, the bottom of the high-transparency polycarbonate sheet cross line online detection device housing is provided with the connector, the connector is fixedly connected with the high-transparency polycarbonate sheet cross line online detection device housing, the bottom of the connector is provided with the pulley, the pulley is movably connected with the connector, the top of the high-transparency polycarbonate sheet cross line online detection device conveyor is provided with a high-transparency polycarbonate sheet, the high-transparency polycarbonate sheet is closely attached to the high-transparency polycarbonate sheet cross line online detection device conveyor, the left side of the inside of the high-transparency polycarbonate sheet cross line online detection device housing is provided with a left conveyor belt, the left conveyor belt is movably connected with the high-transparency polycarbonate sheet cross line online detection device housing, the inside of the left conveyor belt is provided with a left gear, the left gear is movably connected with the left conveyor belt, the right side of the inside of the high-transparency polycarbonate sheet cross line online detection device housing is provided with a right conveyor belt, the right conveyor belt is movably connected with the high-transparency polycarbonate sheet cross line online detection device housing, the inside of the right conveyor belt is provided with a right gear, the right gear is movably connected with the right conveyor belt, the top of the heat sink is provided with a strong light lamp, the strong light lamp is embeddedly connected with the heat sink, the front of the control panel is provided with a display screen, the display screen is embeddedly connected with the control panel, the front of the control panel is provided with a switch, the switch is embeddedly connected with the control panel, the front of the control panel is provided with a key, and the key is embeddedly connected with the control panel."

[0006] The core content of the above scheme is to light the polycarbonate film from bottom to top by the strong light lamp, and the light passes through the polycarbonate film and is sensed by the image receiver. According to the projected pattern, whether cross lines are generated on the polycarbonate film is identified.

[0007] While this method can detect horizontal lines on polycarbonate films, it projects horizontal lines with large waveform variations (i.e., large curvature) clearly and obviously through projection imaging. However, for horizontal lines with small waveform variations (i.e., small curvature), the projection is unclear and not easily observed. Summary of the Invention

[0008] The purpose of this invention is:

[0009] A dual detection device for cross-line marks on extruded polycarbonate films is designed. It utilizes laser refraction and mechanical contact flipping to perform dual detection of cross-line marks on polycarbonate films. This device can detect cross-line marks with large and small waveforms, reducing the probability of cross-line marks with indistinct waveform amplitudes going undetected.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A dual inspection device for cross-grain extrusion of polycarbonate film includes a frame with an upper guide roller and a lower guide roller mounted on it. Both the upper and lower guide rollers are movably connected to the frame via bearings. The frame also includes a laser refraction detection mechanism and a flip angle detection mechanism. The laser refraction detection mechanism is specifically located between adjacent upper and lower guide rollers, while the flip angle detection mechanism is specifically located above the upper guide roller. The laser refraction detection mechanism includes a laser emitter and a laser receiver, with the emitting end of the laser emitter facing the receiving end of the laser receiver. The flip angle detection mechanism includes a flip plate, a thin sheet, a tension spring, and a displacement sensor. The flip plate is located on a hinge, the thin sheet is located at the end of the flip plate and corresponds vertically to the upper guide roller, and the detection end of the displacement sensor faces the flip plate.

[0012] Furthermore, the laser refraction detection mechanism also includes a support, a flipping bracket, and a lower bracket; the flipping bracket is adjustablely connected to the support by bolts, the support is located on the frame, and the laser emitter is located at the end of the flipping bracket.

[0013] Furthermore, the flip bracket is L-shaped, the laser receiver is connected to the frame via the lower bracket, and the receiving end of the laser receiver is specifically located on the extension line of the bolt's axis.

[0014] Furthermore, the flip angle detection mechanism also includes a gantry frame and an upper support; the gantry frame is located at the top of the frame, specifically above the upper guide roller; the hinge seat is located on the side of the gantry frame; the flip plate is hinged to the hinge seat, and the flip plate is plate-shaped and parallel to the axis of the upper guide roller.

[0015] Further, the thickness of the sheet is smaller than the turnover plate, and the end of the sheet is covered with a plastic layer; the material of the plastic layer is polytetrafluoroethylene.

[0016] Further, the two ends of the tension spring are connected with the turnover plate and the gantry side respectively; the displacement sensor is connected with the gantry side through the upper support.

[0017] The present application has the following advantages:

[0018] A kind of polycarbonate film extrusion cross grain double detection equipment, by the collocation and combination of laser refraction detection mechanism and turnover angle detection mechanism, utilize laser refraction and mechanical contact turnover, to carry out double detection to cross grain on polycarbonate film, cross grain can make the refraction angle of laser suffer change, simultaneously cross grain can cause the sheet of contact to overturn, so that the cross grain of wave form amplitude larger and smaller can be detected, reduce the probability of cross grain not being detected that wave form amplitude is not obvious, it is favorable to improve the qualified rate of factory product. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall mechanism schematic view of a kind of polycarbonate film extrusion cross grain double detection equipment of the present application.

[0020] Figure 2 It is another view of the structure shown in the drawing. Figure 1

[0021] Figure 3 It is the structure diagram of the laser refraction detection mechanism of a kind of polycarbonate film extrusion cross grain double detection equipment of the present application.

[0022] Figure 4 It is the structure diagram of the turnover angle detection mechanism of a kind of polycarbonate film extrusion cross grain double detection equipment of the present application.

[0023] Figure 5 It is another view of the structure shown in the drawing. Figure 4

[0024] Marked as in the drawing:

[0025] 1, rack;2, upper guide roller;3, lower guide roller;

[0026] 4, laser refraction detection mechanism;41, support;42, turnover support;43, laser emitter;44, lower support;45, laser receiver;46, bolt;

[0027] 5, turnover angle detection mechanism;51, gantry;52, hinge base;53, turnover plate;54, sheet;55, plastic layer;56, tension spring;57, upper support;58, displacement sensor. DETAILED DESCRIPTION ​​

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0029] Reference Figures 1 to 5 The present application provides a polycarbonate film extrusion cross grain double detection device, which comprises a rack 1, an upper guide roller 2 and a lower guide roller 3 arranged on the rack 1, the upper guide roller 2 and the lower guide roller 3 are movably connected with the rack 1 through bearings, and the upper guide roller 2 and the lower guide roller 3 are used for tensioning and guiding the polycarbonate film; a laser refraction detection mechanism 4 and a turning angle detection mechanism 5 are arranged on the rack 1, the laser refraction detection mechanism 4 is specifically located at a position between adjacent upper guide rollers 2 and lower guide rollers 3, the laser refraction detection mechanism 4 is used for detecting whether there is a cross grain on the polycarbonate film through the principle of laser refraction, the turning angle detection mechanism 5 is specifically located above the upper guide roller 2, and the turning angle detection mechanism 5 is used for detecting whether there is a cross grain on the polycarbonate film through the phenomenon that the cross grain causes different thicknesses; the laser refraction detection mechanism 4 comprises a laser emitter 43 and a laser receiver 45, the emitting end of the laser emitter 43 faces the receiving end of the laser receiver 45, the laser generator 43 is used for emitting laser, and the laser receiver 45 is used for receiving a laser signal; the turning angle detection mechanism 5 comprises a turning plate 53, a sheet 54, a tension spring 56 and a displacement sensor 58, the turning plate 53 is located on a hinge seat 52, the turning plate 53 can be turned up and down relative to the hinge seat 52, the sheet 54 is located at the end of the turning plate 53 and corresponds to the up-and-down position of the upper guide roller 2, the sheet 54 is thin in thickness, so that fine cross grains can be detected, and the detection end of the displacement sensor 58 faces the turning plate 53, and the displacement sensor 58 is used for detecting whether the turning plate 53 is turned.

[0030] The laser refraction detection mechanism 4 further comprises a support 41, a turning support 42 and a lower support 44; the turning support 42 is adjustably connected with the support 41 through a bolt 46, the angle fixing posture of the turning support 42 can be adjusted through the bolt 46, the support 41 is located on the rack 1, and the laser emitter 43 is located at the end of the turning support 42.

[0031] The turning support 42 is L-shaped, the laser receiver 45 is connected with the rack 1 through the lower support 44, the receiving end of the laser receiver 45 is specifically located on the extension line of the axis of the bolt 46, so that when the turning support 42 is adjusted, the receiving end of the laser receiver 45 is within the range of laser light irradiation and possible deviation; the laser receiver 45 can detect a certain range of laser signals; the laser emitter 43 and the laser receiver 45 are both existing mature technologies.

[0032] The flip angle detection mechanism 5 also includes a gantry frame 51 and an upper support 57; the gantry frame 51 is located at the top of the frame 1, specifically above the upper guide roller 2, and mainly serves a fixing function; the hinge seat 52 is located on the side of the gantry frame 51; the flip plate 53 is hinged to the hinge seat 52, and the flip plate 53 can reverse when the sheet 54 is disturbed. The flip plate 53 is plate-shaped and parallel to the axis of the upper guide roller 2, and consistent with the direction of the transverse lines on the polycarbonate film.

[0033] The thickness of the sheet 54 is less than that of the flip plate 53, and the end of the sheet 54 is covered with a plastic layer 55. The plastic layer 55 is wrapped in a U-shape around the end of the sheet 54. The plastic layer 55 is made of polytetrafluoroethylene. Polytetrafluoroethylene has a low coefficient of friction to avoid scratching the surface of the polycarbonate film during the testing process.

[0034] The two ends of the tension spring 56 are connected to the side of the flip plate 53 and the gantry frame 51, respectively. The tension spring 56 is a helical spring, which is used to continuously apply a downward pulling force to the flip plate 53. The displacement sensor 58 is connected to the side of the gantry frame 51 through the upper bracket 57. The displacement sensor 58 is a laser sensor with high accuracy, which can capture the small-angle flip of the flip plate 53.

[0035] The specific workflow of this invention is as follows:

[0036] polycarbonate film from Figure 1 The lower guide roller 3 at the right end of the middle frame 1 is conveyed in sequence through the top of the upper guide roller 2 on the rear side, the top of the upper guide roller 2 on the left side, and the lower part of the lower guide roller 3 at the left end.

[0037] First, adjust the angle between the laser emitter 43 and the polycarbonate film, as well as the relative positions of the laser generator 43 and the laser receiver 45. When the polycarbonate film passes through the laser refraction detection mechanism 4, the laser emitter 43 emits a laser beam, which irradiates the polycarbonate film. After two refractions, the laser beam is detected by the laser receiver 45. Because the polycarbonate film has a certain hardness and is tensioned during transport, if there are horizontal lines on the upper or lower surface of the polycarbonate film, the refraction angle of the laser will change, and the irradiation position of the light will shift. When the laser receiver 45 detects the shift, it can be preliminarily determined that there are horizontal lines on the surface of the polycarbonate film.

[0038] Subsequently, the polycarbonate film reaches the flip angle detection mechanism 5. Under the tension of the tension spring 56, the plastic layer 55 at the end of the sheet 54 presses against the top of the polycarbonate film. If there are horizontal lines on the upper or lower surface of the polycarbonate film, it will cause a change in the thickness of the polycarbonate film. Under the support of the upper guide roller 2, the change in thickness will cause the sheet 54 and the flip plate 53 to flip. If the flip plate 53 flips upward or downward, it will be detected by the displacement sensor 58, which can determine that there are horizontal lines in the polycarbonate film.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims

1. A dual detection device for cross-line defects in polycarbonate film extrusion, comprising a frame (1), wherein an upper guide roller (2) and a lower guide roller (3) are disposed on the frame (1), and both the upper guide roller (2) and the lower guide roller (3) are movably connected to the frame (1) via bearings; characterized in that: The frame (1) is provided with a laser refraction detection mechanism (4) and a flip angle detection mechanism (5). The laser refraction detection mechanism (4) is specifically located between adjacent upper guide rollers (2) and lower guide rollers (3), and the flip angle detection mechanism (5) is specifically located above the upper guide rollers (2). The laser refraction detection mechanism (4) includes a laser emitter (43) and a laser receiver (45), with the emitting end of the laser emitter (43) facing the receiving end of the laser receiver (45). The flip angle detection mechanism (5) includes a flip plate (53), a thin sheet (54), and a tension spring. (56) and displacement sensor (58), the flip plate (53) is located on the hinge (52), the thin plate (54) is located at the end of the flip plate (53) and corresponds to the upper guide roller (2) in the upper and lower positions, the detection end of the displacement sensor (58) faces the flip plate (53); the laser refraction detection mechanism (4) also includes a support (41), a flip bracket (42) and a lower bracket (44); the flip bracket (42) is adjustablely connected to the support (41) by bolts (46), the support (41) is located on the frame (1), and the laser emitter (43) is located on the hinge (52). At the end of the flip bracket (42); the flip bracket (42) is L-shaped, and the laser receiver (45) is connected to the frame (1) through the lower bracket (44). The receiving end of the laser receiver (45) is specifically located on the extension line of the axis of the bolt (46); the thickness of the sheet (54) is less than that of the flip plate (53), and the end of the sheet (54) is covered with a plastic layer (55). The plastic layer (55) is U-shaped and wrapped around the end of the sheet (54); the material of the plastic layer (55) is polytetrafluoroethylene, which is used to avoid scratching the surface of the polycarbonate film during the detection process; The two ends of the tension spring (56) are respectively connected to the side of the flip plate (53) and the gantry (51); the flip angle detection mechanism (5) also includes the gantry (51) and the upper support (57); the gantry (51) is located at the top of the frame (1), specifically above the upper guide roller (2); the hinge seat (52) is located on the side of the gantry (51); the flip plate (53) is hinged to the hinge seat (52), the flip plate (53) is plate-shaped and parallel to the axis of the upper guide roller (2); the displacement sensor (58) is connected to the side of the gantry (51) through the upper support (57).

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