Thin film internal stress defect detection equipment

Abstract

The utility model discloses thin film internal stress defect detection equipment, which belongs to the technical field of thin film detection and comprises a height-adjustable support, a linear sliding device is mounted on the height-adjustable support, and the linear sliding device is positioned above a thin film and is perpendicular to the moving direction of the thin film. A detection mechanism is slidably mounted on the linear sliding device, the detection mechanism comprises a sliding base and an elastic assembly, the sliding base is slidably mounted on the linear sliding device, one end of the elastic assembly is mounted on the sliding base, and the other end of the elastic assembly is connected with a contact unit; the elastic assembly can adjust the height of the contact unit to enable the contact unit to abut against the film all the time, a sensor for monitoring the position change of the contact unit is installed on the elastic assembly, and the problems of edge swinging and internal stress defects existing in the production process of the film can be accurately detected.

Description

Technical Field

[0001] The utility model relates to the technical field of film detection, in particular to a device for detecting internal stress defects in a film. Background Art

[0002] During the production of regenerated cellulose film, affected by factors such as the quality of viscose, the uniformity of the spraying slot, the accuracy of the transmission system, and the drying conditions, problems such as inconsistent thickness and internal stress defects may occur. In severe cases, when the film is tensioned, edge flutter, gully, and tension lines may occur, which will seriously affect the subsequent deep processing process.

[0003] Existing detection devices for edge flutter and internal stress defects in film products usually use non-contact sensors to detect the deformation degree of the film. Since the film is usually subjected to a large tension force during the movement or transfer on the production line, the deformation of the film caused by internal stress defects is almost undetectable under the tensioned state. Therefore, non-contact detection equipment cannot accurately detect the internal stress defects existing in the film.

[0004] The existing contact detection method requires the tester to press on the film surface by hand, and confirm the position and degree of the defect through the applied pressure and the feedback of the film deformation. This detection method is not only time-consuming and laborious, but also the detection results vary from person to person and cannot be specifically quantified. In addition, for the timeliness of detection, it is necessary to detect during the production of the film, and touching the moving film during production is somewhat dangerous. Content of the Utility Model

[0005] Regarding the problems existing in the prior art, a device for detecting internal stress defects in a film provided by the utility model can accurately detect the edge flutter and internal stress defect problems existing in the film during the production process.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A device for detecting internal stress defects in a film includes a height-adjustable bracket, a linear sliding device is installed on the height-adjustable bracket, the linear sliding device is located above the film, a detection mechanism is slidably installed on the linear sliding device, and the sliding direction of the detection mechanism is perpendicular to the movement direction of the film;

[0007] The detection mechanism includes a sliding base and an elastic component. The sliding base is slidably installed on the linear sliding device, the elastic component is installed on the sliding base, a contact unit is installed on the elastic component, the elastic component can adjust the height of the contact unit, the contact unit always abuts against the film, and a sensor for monitoring the position change of the contact unit is installed on the elastic component.

[0008] Preferably, the sliding base includes an installation cylinder which is slidably installed on the linear sliding device. The elastic component includes a rotating shaft which is rotatably installed in the installation cylinder. Both ends of the rotating shaft are provided with torsion springs. One end of the torsion spring is fixed on the installation cylinder, and the other end of the torsion spring is fixed on the rotating shaft.

[0009] A L-shaped rod is fixed on the rotating shaft. The L-shaped rod includes a long rod and a short rod. A rotating guide groove is provided on the installation cylinder. One end of the long rod is connected to the rotating shaft, and the other end of the long rod passes through the rotating guide groove and is connected to the short rod. The end of the short rod away from the long rod is connected to the contact unit, and the lower end of the contact unit contacts the film.

[0010] Preferably, the sensor is installed on the rotating shaft, and the sensor can monitor the rotation angle of the rotating shaft.

[0011] Preferably, two bearings are installed at both ends of the rotating shaft, and the rotating shaft is rotatably installed on the installation cylinder through the two bearings.

[0012] Preferably, the width of the rotating guide groove is slightly larger than the diameter of the L-shaped rod.

[0013] Preferably, the sliding base includes a connecting plate. One end of the connecting plate is slidably installed on the linear sliding device, and a vertical hole is provided at the other end of the connecting plate.

[0014] The elastic component includes a pressing spring and a connecting rod. The upper end of the connecting rod is slidably matched with the vertical hole, and the lower end of the connecting rod is connected to the contact unit. The pressing spring is sleeved on the connecting rod. One end of the pressing spring is fixed at the lower end of the connecting plate, and the other end of the pressing spring is fixed on the connecting rod.

[0015] Preferably, the sensor is installed on the connecting rod, and the sensor can monitor the height change of the contact unit.

[0016] Preferably, an auxiliary contact which directly acts on the surface of the film with the force generated by the elastic component is installed at the lower end of the contact unit.

[0017] Preferably, limiting components are provided at both ends of the linear sliding device, and the limiting components can limit the movement of the detection mechanism.

[0018] The beneficial effects of the present utility model are shown in:

[0019] 1. An elastic component is installed on the sliding base of the present utility model, which can press the contact unit against the film. When there are edge fluctuations or internal stress defects in the film, the contact unit will have a large displacement. By the displacement amount of the contact unit feedback by the sensor, the problems of edge fluctuations and internal stress defects existing in the film during the production process can be accurately detected.

[0020] 2. The present utility model installs a linear sliding device above the film. The detection mechanism reciprocates along the width direction of the film driven by the linear sliding device. The contact unit forms a serpentine path on the film, increasing the detection area of the film, improving the detection efficiency, and realizing the standardized detection of edge fluctuations and internal stress defects of film products.

[0021] 3. A height-adjustable bracket is provided at the lower end of the linear sliding device of the present utility model, which can adjust the horizontal height of the linear sliding device according to the height of the film, so that the contact unit contacts the film, facilitating the application to film production lines of different heights, expanding the application range of the device. By adjusting the height, the initial pressure of the elastic component acting on the film surface can also be indirectly adjusted to adapt to the detection of films with different tensile strengths, improving the detection range. Description of the Drawings

[0022] Figure 1 It is a top view of the linear sliding device of a film internal stress defect detection device of the present utility model;

[0023] Figure 2 It is a partial cross-sectional view of the installation cylinder of a film internal stress defect detection device of the present utility model;

[0024] Figure 3 It is a side view of the L-shaped rod of a film internal stress defect detection device of the present utility model;

[0025] Figure 4 It is a schematic diagram of the installation position of the connecting plate of a film internal stress defect detection device of the present utility model.

[0026] In the figure: 1 - film, 2 - linear sliding device, 3 - limit component, 4 - installation cylinder, 5 - rotating shaft, 6 - L-shaped rod, 7 - torsion spring, 8 - sensor, 9 - contact unit, 10 - bearing, 11 - height-adjustable bracket, 12 - pressing spring, 13 - connecting plate, 14 - connecting rod, 15 - rotating guide groove. Detailed Embodiment

[0027] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the drawings.

[0028] Such as Figures 1-4A thin film internal stress defect detection device shown in the figure includes a height-adjustable bracket 11. A linear sliding device 2 is slidably mounted on the height-adjustable bracket 11. The linear sliding device 2 is located above the thin film 1. A detection mechanism is slidably mounted on the linear sliding device 2. The sliding direction of the detection mechanism is perpendicular to the movement direction of the thin film 1. The detection mechanism is to contact the thin film 1 and provide a constant pressure to the thin film 1. The detection mechanism is electrically connected to a computer through a data cable to transmit the detected signal to the computer. The computer converts the internal stress into a visible form for observation according to the signal fed back by the detection device;

[0029] During the movement of the thin film 1, the detection mechanism also reciprocates along the width direction of the thin film 1 driven by the linear sliding device 2. The cross movement of the two can make the movement path of the detection mechanism on the thin film 1 cover the entire roll of the thin film 1, thereby increasing the detected area of the thin film 1.

[0030] Specifically, the height-adjustable bracket 11 can adjust the distance between the linear sliding device 2 and the thin film 1 according to the height of the thin film 1, which is convenient for application on thin film 1 production lines with different heights.

[0031] In the utility model, limit components 3 are provided at both ends of the linear sliding device 2. The limit components 3 can limit the movement of the detection mechanism, and limit the single sliding distance of the detection mechanism to be slightly less than the width of the thin film 1. The detection mechanism includes a sliding base and an elastic component. The sliding base is slidably mounted on the linear sliding device 2. The elastic component is mounted on the sliding base. A contact unit 9 is mounted on the elastic component. The elastic component can adjust the height of the contact unit 9 so that the contact unit 9 always abuts against the thin film 1. The other end of the elastic component is connected to the contact unit 9. The elastic component can adjust the height of the contact unit 9 so that the contact unit 9 always abuts against the thin film 1. A sensor 8 for monitoring the position change of the contact unit 9 is mounted on the elastic component.

[0032] Specifically, the elastic component can provide a constant pressure to the contact unit 9 to press the contact unit 9 against the thin film 1. When the thin film 1 has a fluttering edge or a large deformation under pressure, the elastic component can also drive the contact unit 9 to displace, so that the contact unit 9 always contacts the surface of the thin film 1. By monitoring the displacement amount of the contact unit 9 through the sensor 8, the problems of fluttering edge and internal stress defects existing in the thin film 1 during the production process can be accurately detected;

[0033] Specifically, the position information of the contact unit 9 is fed back through the sensor 8, and then the collected feedback information is summarized into a data set. By analyzing the data set, a visible fluttering edge and internal stress defect map can be obtained, which improves the detection efficiency and realizes the standardized detection of the fluttering edge and internal stress defects of thin film products.

[0034] At the lower end of the contact unit 9 of the utility model, an auxiliary contact is installed, which directly acts on the surface of the film with the force generated by the elastic component. The auxiliary contact can be either a universal ball or a floating nozzle. The universal ball reduces the friction generated during the relative movement with the film 1 by rotating the ball, thereby reducing the damage caused by the contact unit 9 to the surface of the film 1;

[0035] The floating nozzle, on the other hand, utilizes the surface effect principle, that is, the floating nozzle sprays air higher than atmospheric pressure. The ejected gas forms an air cushion between the floating nozzle and the film. The supporting force generated during this process lifts the floating nozzle, keeping it at a certain distance from the film all the time. This method can not only transfer the pressure of the elastic component to the film through the air flow, but also avoid direct contact with the film and cause damage to the film surface.

[0036] Embodiment 1

[0037] The sliding base includes an installation cylinder 4, and the installation cylinder 4 is slidably installed on the linear sliding device 2. The elastic component includes a rotating shaft 5. Two bearings 10 are installed at both ends of the rotating shaft 5, and the rotating shaft 5 is rotatably installed on the installation cylinder 4 through the two bearings 10. Torsion springs 7 are installed at both ends of the rotating shaft 5. One end of the torsion spring 7 is fixed on the installation cylinder 4, and the other end of the torsion spring 7 is fixed on the rotating shaft 5;

[0038] An L-shaped rod 6 is fixed on the rotating shaft 5. The L-shaped rod 6 includes a long rod and a short rod. A rotating guide groove 14 is provided on the installation cylinder 4. One end of the long rod is connected to the rotating shaft 5, and the other end of the long rod passes through the rotating guide groove 14 and is connected to the short rod. The end of the short rod away from the long rod is connected to the contact unit 9. The lower end of the contact unit 9 contacts the film 1. The sensor 8 is installed on the rotating shaft 5, and the sensor 8 can monitor the rotation angle of the rotating shaft 5;

[0039] In addition, an auxiliary adjustment device capable of rotating the entire installation cylinder 4 can be installed on the linear sliding device 2 and electrically connected to a computer, and the computer controls its rotation. Indirectly adjust the initial placement angle when the L-shaped rod 6 works. When the film breaks or the detection is completed, the computer can control the auxiliary adjustment device to rotate the installation cylinder 4 upward, raising the contact unit 9 to a height higher than the horizontal height during film transmission. At the beginning of the next detection, the auxiliary adjustment device drives the installation cylinder 4 to rotate downward. After the installation cylinder 4 is reset, the L-shaped rod 6 installed on it inclines downward, so that the auxiliary contact installed at the lower end of the contact unit 9 can smoothly act on the film surface with the force generated by the elastic component, providing an initial pressure for stress detection.

[0040] Specifically, the torsion spring 7 can provide a constant pressure to the contact unit 9, pressing it against the surface of the film 1. Since the film 1 is under a constant tension during processing and transportation, its surface is taut. Under normal circumstances, the deformation of the film 1 under a fixed pressure is stable. At this time, the contact unit 9 moves on the surface of the film 1, and the displacement signal feedback by the sensor 8 is also relatively stable.

[0041] When the internal stress of the film 1 changes or there is a situation of edge flutter, the film 1 will produce a large deformation under a constant pressure, and the position of the contact unit 9 pressing against the film 1 will also change accordingly. Since the contact unit 9 is connected to the rotating shaft 5 through the L-shaped rod 6, the displacement of the contact unit 9 will be indirectly reflected by the rotation angle of the rotating shaft 5. By installing the sensor 8 on the rotating shaft 5, the angle change of the contact unit 9 can be monitored.

[0042] Embodiment 2

[0043] The sliding base includes a connecting plate 13. One end of the connecting plate 13 is slidably installed on the linear sliding device 2, and the other end of the connecting plate 13 is provided with a vertical hole. The elastic component includes a pressing spring 12 and a connecting rod 14. The upper end of the connecting rod 14 is slidably matched with the vertical hole, and the lower end of the connecting rod 14 is connected to the contact unit 9. The pressing spring 12 is sleeved on the connecting rod 14. One end of the pressing spring 12 is fixed to the lower end of the connecting plate 13, and the other end of the pressing spring 12 is fixed to the connecting rod 14 to prevent the connecting rod 14 from falling from below the connecting plate 13.

[0044] The sensor 8 is installed on the connecting rod 14, and by detecting the height change of the connecting rod 14, the displacement of the contact unit 9 is indirectly reflected;

[0045] Specifically, the pressing spring 12 provides a constant pressure to press the contact unit 9 against the surface of the film 1. When the contact unit 9 moves to the part of the film 1 with edge flutter or internal stress defects, the film 1 will have a large deformation under the pressure, and the contact unit 9 pressing against the film 1 will be displaced accordingly. The sensor 8 can judge whether there are edge flutter and internal stress defects on the film 1 by feeding back the positioning signal of the connecting rod 14.

[0046] In addition, an auxiliary adjustment device capable of controlling the lifting of the connecting plate 13 can also be installed on the linear sliding device 2 and electrically connected to a computer, and the computer controls its up and down movement. Indirectly realize the adjustment of the initial height of the connecting rod 14 during operation. When the film breaks or the detection is completed, the computer controls the auxiliary adjustment device to lift the connecting plate 13 upward, thereby raising the contact unit 9 to a height higher than the horizontal height during film transmission. At the beginning of the next detection, the auxiliary adjustment device drives the connecting plate 13 to move downward. After the connecting plate 13 is reset, the connecting rod 14 connected thereto also returns to its initial height. So that the auxiliary contact installed at the lower end of the contact unit 9 can smoothly apply the force generated by the elastic component to the surface of the film, providing an initial pressure for stress detection.

[0047] It should be understood that the use of these embodiments is only for illustrating the present utility model rather than intending to limit the protection scope of the present utility model. In addition, it should also be understood that after reading the technical content of the present utility model, those skilled in the art can make various changes, modifications and / or variations to the present utility model, and all these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A thin film internal stress defect detection device, characterized in that It includes a height-adjustable bracket, on which a linear sliding device is installed. The linear sliding device is located above the film, and a detection mechanism is slidably installed on the linear sliding device. The sliding direction of the detection mechanism is perpendicular to the movement direction of the film. The detection mechanism includes a sliding base and an elastic component. The sliding base is slidably installed on the linear sliding device. The elastic component is installed on the sliding base, and a contact unit is installed on the elastic component. The elastic component can adjust the height of the contact unit, and the contact unit always abuts against the film. A sensor for monitoring the position change of the contact unit is installed on the elastic component.

2. The thin film internal stress defect detection device according to claim 1, wherein The sliding base includes an installation cylinder, which is slidably installed on the linear sliding device. The elastic component includes a rotating shaft, which is rotatably installed in the installation cylinder. Torsion springs are installed at both ends of the rotating shaft. One end of the torsion spring is fixed on the installation cylinder, and the other end of the torsion spring is fixed on the rotating shaft. An L-shaped rod is fixed on the rotating shaft. The L-shaped rod includes a long rod and a short rod. A rotating guide groove is provided on the installation cylinder. One end of the long rod is connected to the rotating shaft, and the other end of the long rod passes through the rotating guide groove and is connected to the short rod. The end of the short rod away from the long rod is connected to the contact unit, and the lower end of the contact unit contacts the film.

3. The thin film internal stress defect detection device according to claim 2, wherein, The sensor is installed on the rotating shaft, and the sensor can monitor the rotation angle of the rotating shaft.

4. The thin film internal stress defect detection device according to claim 2, characterized in that, Two bearings are installed at both ends of the rotating shaft, and the rotating shaft is rotatably installed on the installation cylinder through the two bearings.

5. The thin film internal stress defect detection device according to claim 2, characterized in that, The width of the rotating guide groove is slightly larger than the diameter of the L-shaped rod.

6. The thin film internal stress defect detection device according to claim 1, characterized in that, The sliding base includes a connecting plate. One end of the connecting plate is slidably installed on the linear sliding device, and a vertical hole is provided at the other end of the connecting plate. The elastic component includes a pressing spring and a connecting rod. The upper end of the connecting rod is slidably matched with the vertical hole. The lower end of the connecting rod is connected to the contact unit. The pressing spring is sleeved on the connecting rod. One end of the pressing spring is fixed at the lower end of the connecting plate, and the other end of the pressing spring is fixed on the connecting rod.

7. The thin film internal stress defect detection device according to claim 6, characterized in that, The sensor is installed on the connecting rod, and the sensor can monitor the height change of the contact unit.

8. The thin film internal stress defect detection device according to claim 1, characterized in that, An auxiliary contact for directly applying the force generated by the elastic component to the surface of the film is installed at the lower end of the contact unit.

9. The thin film internal stress defect detection device according to claim 1, characterized in that, Limit components are provided at both ends of the linear sliding device, and the limit components can limit the movement of the detection mechanism.

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