JP2004077426A - Defect inspecting method for drive belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defect inspecting method for a drive belt for speedily and accurately inspecting defects on a belt end face. <P>SOLUTION: In a first invention, the belt end face of the belt 1 for drive is irradiated with slit laser from a laser light source 2, regular reflection light in a belt peripheral direction and a belt end face direction is received by respective pieces of light receiving apparatus 4, 5, 6, and the defects on the belt end face are detected based on the received light waveforms. In a second invention, the belt body section of the drive belt made of a magnetic material is magnetized in the circumference direction, leak flux is measured at the belt end face upper section and the belt body section each, the signal of the weld line of the belt is masked by the measurement value of the belt body section and at the same time the defects on the belt end face are detected. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a driving belt defect inspection method capable of accurately detecting a defect generated on a belt end surface in a driving belt manufacturing process.
[0002]
[Prior art]
Drive belts for conveyance and power transmission are widely used in various industrial fields, but especially when used under high-speed, high-tension conditions, if there is a defect on the belt end surface, the belt will fail during operation. Starting from this point, the belt may break, leading to a serious accident. Therefore, in the case of a metal belt such as a steel belt, the belt end face is polished, but it is difficult to completely eliminate defects, and new defects may be caused by polishing.
[0003]
Therefore, conventionally, a defect inspection has been performed by an inspector while photographing both end faces in the width direction of the driving belt with a magnifying glass while scanning the driving belt and watching an enlarged image displayed on a monitor.
[0004]
However, in the method in which the inspector inspects the defect while watching the monitor, the scanning speed of the belt cannot be increased in order to increase the defect detection accuracy. Therefore, there is a problem that the inspection time is long and the inspection efficiency is not improved. In addition, there is a problem that the inspection accuracy varies depending on the inspector.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, and provides a drive belt defect inspection method capable of automatically and accurately inspecting a belt end face defect that may lead to breakage of the drive belt at high speed. It was done to do so.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the driving belt defect inspection method according to the first aspect of the present invention irradiates a slit laser to a belt end surface of the driving belt and generates regular reflection light in a belt circumferential direction and a belt end surface direction. Each belt receives light and detects a defect on the belt end face based on the waveform of the received light.
[0007]
In order to solve the same problem, a defect inspection method for a driving belt according to the invention according to claim 2 is characterized in that the belt body of the driving belt made of a magnetic material is magnetized in the circumferential direction, and the upper part of the belt end surface and the belt body are magnetized. The measuring unit measures the leakage magnetic flux, and detects a defect on the end face of the belt while masking the signal of the welding line of the belt based on the measured value of the belt body. The invention of claim 2 is applied to a magnetic belt such as a steel belt.
[0008]
According to the inspection method of the present invention, defects generated in the manufacturing process of the drive belt can be inspected by optical means or magnetic means at high speed and automatically with high accuracy, so that no inspector is required, High production efficiency can be achieved by eliminating the production bottleneck due to the inspection time.
[0009]
In the embodiments described below, the driving belt is a steel belt incorporated in a continuously variable transmission, but in the present specification, the driving belt is a drive for precision equipment such as a printing machine, a copying machine, a robot, and an OA printer. Belts for transporting precision parts such as semiconductor parts, electronic and electrical parts, belts for transporting high-temperature parts such as drying furnaces and heating furnaces, and belts for transporting high-temperature parts such as fired parts, foods, chemicals, and pharmaceuticals And various belts such as a belt for transporting sanitary goods and a belt for transporting precision inspections.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a schematic perspective view showing an embodiment of the first aspect of the present invention, wherein 1 is a driving belt as an inspection object, and 2 is a laser light source that irradiates a slit laser 3 to the belt end surface. As shown in FIG. 2, the width of the slit laser 3 is set to be equal to or less than the width of the defect to be inspected generated on the end face of the belt, and the length is set so that the belt does not come off even if the belt is shaken by vibration during belt scanning. It is preferable that the width be equal to the belt fluctuation width. Here, the width is 5 to 20 μm and the length is 100 to 300 μm. The slit laser 3 irradiates the belt end surface such that the incident angle θ is within 30 °.
[0011]
In the present invention, the regular reflection light of the slit laser 3 is received by three light receiving devices provided in the belt circumferential direction and the belt end surface direction. As shown in FIGS. 3 and 4, the regular reflection light in the circumferential direction of the belt is reflected by the central regular reflection light receiving device 4, and the regular reflection light in the belt end surface direction is reflected by the right slope regular reflection light receiving device 5 and the left slope regular reflection light receiving device. The light is received by the device 6. In this example, since the cross section of the driving belt 1 is substantially semicircular, the central regular reflection light receiving device 4 is arranged with the angle in the belt thickness direction set to 0 as shown in FIG. Further, the right slope regular reflection light receiving device 5 and the left slope regular reflection light receiving device 6 have an angle equal to the incident angle α with respect to the normal line of the belt end surface irradiated with the slit laser 3 as shown in FIG. Placed.
[0012]
Next, the relationship between the defect of the belt end surface and the light receiving waveform of each light receiving device will be described. FIG. 5 shows an example of a defect on the belt end surface. Defect A has a disordered shape at the center of the belt end face, defect B has a disordered shape on the left slope of the belt end face, and defect C has a shape disorder on the right slope of the belt end face. Is disturbed.
[0013]
FIG. 6 is a diagram showing a light receiving waveform of each light receiving device. In the case of the defect A whose shape is disturbed at the center of the belt end surface, the regular reflection light of the slit laser 3 does not enter the central regular reflection light receiving device 4, so that the light reception signal is reduced. In the defect B whose shape is distorted on the left side slope of the belt end surface, the regular reflection light on the left side slope of the slit laser 3 does not enter the left slope regular reflection light receiving device 6, and the light reception signal is reduced. Similarly, at the defect C, the light reception signal of the right slope regular reflection light receiving device 5 decreases. By arranging the three light receiving devices in this way, it is possible to automatically detect a defect on the belt end surface.
[0014]
When the belt end surface shape is nearly horizontal, a certain degree of defect detection is possible only by the central regular reflection light receiving device 4. Conversely, when the shape of the belt end surface is more complicated, it is possible to more reliably detect a defect by arranging the regular reflection light receiving device corresponding to the normal line of each section of the sectional shape.
[0015]
As described above, according to the driving belt defect inspection method of the present invention, it is possible to automatically and accurately inspect the belt end surface for defects that may cause the driving belt to break.
[0016]
FIG. 7 is a schematic sectional view showing an embodiment of the second aspect of the present invention.
According to the second aspect of the present invention, the belt body of the driving belt 1 made of a magnetic material is magnetized in the circumferential direction. In this embodiment, the drive belt 1 is rotated while being wound around the surface of the hollow stainless steel roll 10, and the belt body is magnetized in the circumferential direction by the magnetizer 11 housed inside the hollow stainless steel roll 10.
[0017]
As shown in FIG. 7, if there is a defect in the belt end surface, a leakage magnetic flux is generated in the entire circumferential direction from the defect, so the leakage magnetic flux is measured by the magnetic sensor 12 disposed above the belt end surface. An electromagnetic coil can be used as the magnetic sensor 12. According to this method, a high-speed response can be obtained, and even if the driving belt 1 is run at, for example, 1200 m per minute, defect detection can be performed with high accuracy. The reason why the magnetization is set to the circumferential direction is that when magnetized in the thickness direction, the leakage magnetic flux leaks at the boundary of the end face. However, this does not apply when the defect to be detected is sufficiently larger than the leakage magnetic flux due to the end face boundary.
[0018]
However, most of the drive belt 1 made of a magnetic material is a steel belt formed by joining flat plates and performing electric welding or laser welding. For this reason, since the material changes on the welding line, a leakage magnetic flux is generated, and there is a possibility that a defect is erroneously detected. Therefore, in the present invention, as shown in FIG. 8, a magnetic sensor 13 is also disposed above the center of the belt body to detect a welding line based on the leakage magnetic flux, and the belt sensor is welded based on the measured value of the belt body by the magnetic sensor 13. Detects defects on the belt end face while masking the line signal. A specific example is shown in FIG.
[0019]
As described above, when the magnetic sensor 13 detects the welding line, a countermeasure against erroneous detection is performed so that even if the magnetic flux is detected by the magnetic sensor 12 disposed above the end surface of the belt, it is not regarded as a defect. This makes it possible to quickly and reliably detect the one end face defect.
[0020]
【The invention's effect】
As described above, the method for inspecting defects of a driving belt according to claim 1 irradiates a slit laser to a belt end surface of the driving belt and receives specularly reflected light in a belt circumferential direction and a belt end surface direction, respectively. By detecting a defect on the belt end surface based on the received light waveform, the defect on the belt end surface can be optically detected at high speed and reliably automatically.
[0021]
According to a second aspect of the present invention, there is provided a driving belt defect inspection method, comprising: magnetizing a belt body of a driving belt made of a magnetic material in a circumferential direction; By detecting defects on the belt end face while masking the signal of the belt welding line based on the measured values, the defects on the end face of the drive belt made of a magnetic material can be automatically detected at high speed while avoiding erroneous detection due to the welding line. Can be detected.
[0022]
Therefore, according to these inventions, the inspection time can be greatly shortened compared with the conventional art, and the inspection efficiency can be improved, and an inspector is not required. Further, it is possible to prevent the inspection accuracy from being varied by the inspector. There are many advantages.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an embodiment of the present invention.
FIG. 2 is a plan view showing the size of a slit laser.
FIG. 3 is a layout diagram of a light receiving device.
FIG. 4 is a layout diagram of a light receiving device.
FIG. 5 is a cross-sectional view illustrating an example of a defect on a belt end surface.
FIG. 6 is a diagram showing a light receiving waveform of each light receiving device.
FIG. 7 is a schematic sectional view showing an embodiment of the invention of claim 2;
FIG. 8 is a layout diagram of a magnetic sensor.
FIG. 9 is a waveform diagram of a leakage magnetic signal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive belt 2 Laser light source 3 Slit laser 4 Center regular reflection light receiving device 5 Right slope regular reflection light receiving device 6 Left slope regular reflection light receiving device 10 Hollow stainless steel roll 11 Magnetizer 12 Magnetic sensor 13 arranged above belt end surface 13 Belt trunk Magnetic sensor placed at the top of the center

Claims (2)

The drive belt is characterized by irradiating a slit laser to the belt end face of the drive belt, receiving regular reflection light in the belt circumferential direction and the belt end face direction, and detecting a defect on the belt end face based on the received light waveform. Belt defect inspection method. Magnetize the belt trunk of the drive belt made of magnetic material in the circumferential direction, measure the leakage magnetic flux at the upper part of the belt end surface and at the belt trunk, respectively, and mask the signal of the belt welding line with the measured value of the belt trunk. A defect inspection method for a driving belt, comprising detecting a defect on a belt end surface.

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