JPH0823532B2 - Appearance inspection device for rubber belts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber belt appearance inspection device, and more particularly to a rubber belt appearance inspection device for detecting a defective portion of an uneven surface such as a crack, a chip or a dent on the surface of the rubber belt.

[0002]

2. Description of the Related Art Conventionally, in the manufacture of V-ribbed belts, a vulcanized cylindrical rubber sleeve is cut into a predetermined width, and the rubber sleeve is hung on a driving roll and a driven roll under a constant tension while running. The rotating grinding wheel was engaged with the rubber sleeve, and the rubber sleeve was provided with a plurality of ribs. The obtained rubber sleeve was cut into a predetermined width in the next step and finished into individual belts. Then, the operator visually inspected the defective portion of the uneven surface such as cracks, chips, and dents on the polished surface of each belt.
If such a defect exists on the belt surface, when the belt is run, cracks may grow from this defect and cause early belt failure, and such inspection is performed to maintain the belt quality. Was also an important process.

[0003]

However, although the visual judgment of the operator is tentatively standardized, it is somewhat different depending on the individual and largely depends on the feeling of the operator. In addition, a skilled worker is required to make a quick quality decision. Therefore, in the past, it has been attempted to automate this visual inspection. For example,
The inspected object is irradiated with light and the reflected light is used by a PSD element (semiconductor position detecting element) to measure the depth of the recessed portion, which is an abnormal portion, and an abnormal signal is emitted when the depth exceeds a certain value. It was However, even with this inspection apparatus, if the depth of the depression is small, there is a large problem that cannot be detected, and the accuracy of the inspection is poor. Therefore, it has been difficult to perform a visual inspection of a product having a small dent portion such as a rubber belt.

In addition, if the surface of the rubber sleeve after polishing the surface has polishing debris or dust on it, the inspection device may detect this and there is also a problem that even a normal surface may be detected as a defect. . The present invention solves such a problem, and removes dust adhering to the object to be inspected to obtain an accurate inspection state, and even a small recess can be inspected, which is relatively easy for an operator. An object of the present invention is to provide a visual inspection device for a rubber belt, which enables visual inspection in a state close to visual judgment.

[0005]

SUMMARY OF THE INVENTION That is, according to the present invention, which is adapted to the above object, there is provided a rubber belt appearance inspection device for detecting irregularities such as cracks, chips and dents on the surface of an object to be inspected which is a rubber belt. , A belt running unit that hangs a rubber belt on a driving roll and a driven roll and runs it under a constant tension, a belt positioning roll that abuts the running rubber belt surface to prevent the rubber belt from being biased, The brush part that contacts the surface of the rubber belt and removes dust and the like adhering to the rubber belt, and while moving along the width direction of the rubber belt that is hung on the driving roll and the driven roll, projects and receives light toward the rubber belt surface. A laser processing section having a laser section for performing a marking and a mark section for marking a value on the surface of the rubber belt when a value outside the judgment value range is detected by the laser section. Becomes, the light quantity level of the laser unit
And the displacement accuracy, the displacement accuracy drops sharply.
A light level is set nearby and the amount of deviation from the true value
In the appearance inspection apparatus for the rubber belt, the offset value of the amplifier is set so as to increase .

The present invention also provides a rotating brush and a fixed brush.
It includes a brush part consisting of two.

[0007]

According to the present invention, the rubber belt is hung on the driving roll and the driven roll, and while running under a constant tension, the belt positioning roll prevents the rubber belt from swinging in the width direction, and the brush portion operates. The surface of the rubber belt is cleaned by contacting the surface of the rubber belt while running to remove dust and the like from the surface of the rubber belt. Receive the reflected light.

Here, the light receiving portion has a resistance layer,
The light energy received by the light receiving portion flows as a photocurrent through the resistance layer and is divided into two electrodes and extracted. At this time, if the currents drawn from the electrodes are I ₁ and I ₂ , the light quantity =
I ₁ + I ₂ and displacement = (I ₁ −I ₂ ) / (I ₁ + I
₂ + B). However, B is the offset value of the amplifier. Therefore, since the reflected light from the normal portion of the rubber belt always enters the center of the resistance layer, the currents I ₁ and I ₂ are equal and the displacement (distance) is zero, while the reflected light from the uneven portion of the rubber belt is the resistance. Since the light is incident away from the center of the layer, I ₁ and I ₂ are different from each other, and a displacement occurs.

In the present invention, the characteristic that the laser light amount decreases when a defective portion is detected and the relational expression of the displacement are utilized. When the laser light amount is smaller than a certain value, the displacement data is larger than the true value. Then, an error is caused, and by utilizing this, it becomes possible to detect a defect with a small change in displacement data.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a rubber belt appearance inspection apparatus according to the present invention, and FIG. 2 is a side view of FIG. According to this, in the rubber belt appearance inspection device 1 of the present invention, minute cracks or chips on the surface of the inspection object formed of the rubber belt 2,
This is a device for automatically inspecting irregularities such as dents, and a belt traveling unit 3 for traveling the rubber belt 2 as the inspection object.
A belt positioning roll 4 for preventing the running of the rubber belt 2 in one direction while running and for accurately running, and a brush portion 5 for removing dust and the like adhering to the surface of the rubber belt 2.
The laser processing unit 6 includes a laser unit 7 and a mark unit 8 that marks the surface of the rubber belt 2 when a value outside the judgment value range is detected by the laser unit 7.

Here, the belt traveling unit 3 comprises a driving roll 10 and a movable driven roll 11.
The drive roll 10 is supported by a bearing 12, and a pulley 16 attached to the tip of the drive roll 10 is connected to a prime mover 14 installed on an upper support 13 via a transmission belt 15. On the other hand, the driven roller 11 has its bearing 17 fixed to the tip of a rod 19 of a cylinder 18 installed on the upper support 13. The bearing 17 of the driven roll 11 has a slide portion 20 fixed to the bearing 17 fitted to a pair of guide rails 21 fixed to the upper support 13. Therefore, when the cylinder 18 operates, the driven roll 11 horizontally separates from the drive roll 10 along the guide rail 20 and approaches the driven roll 11.

The belt positioning roll 4 is the drive roll 1
The frame 23 located just above 0 and supporting it
Are connected to a pair of guide rods 24 provided on the upper support 13 and a cylinder 25 located between them. The belt positioning roll 4 moves up and down by the operation of the cylinder 25, and comes into contact with the surface of the rubber belt 2 which is suspended between the drive roll 10 and the driven roll 11 under a predetermined tension. As a result, the rubber belt 2 having the core wire embedded therein does not deviate in one direction even when running. In particular, when inspecting the rubber belt 2 having a plurality of ribs in the width direction, the belt positioning roll 4 that fits into the rib may be used.

The brush unit 5 is composed of two brushes, a rotating brush 27 and a fixed brush 28, and both of the brushes 27 and 28 are in contact with the driven roll 11. The rotating brush 27 is connected to a prime mover 29 via a transmission belt 30 and removes dust such as rubber scraps adhering to the running rubber belt 2. Further, the fixed brush 28 has a function of reliably dropping the rubber scraps not dropped by the rotating brush 27. Therefore, the fixed brush 28 needs to be positioned behind the rotating brush 27 with respect to the traveling direction of the rubber belt 2.

The laser processing section 6 comprises at least one set of laser section 7 and a mark section 8 for marking the surface of the rubber belt 2 when a value outside the range of the judgment value is detected by the laser section 7. The laser processing unit 6 is installed on the base 31, and the prime mover 32 moves the rubber belt 2 on the rail 33.
Move in the width direction. Further, the bearing 34 provided in the lower portion of the laser processing unit 6 is fitted into the screw portion 35 installed on the base 31, and the laser processing unit 6 is driven by the driving roll 10 by the operation of the servo motor 36 provided at the tip of the screw portion 35. Move to the side.

The laser unit 7 projects a laser beam toward the surface of the rubber belt 2 which is running and receives the light reflected from the belt surface. The light receiving portion 37 has a semiconductor position detecting element (PSD), and the resistance layer of the PSD converts light energy into photocurrent and divides the resistance layer into two electrodes for extraction. The laser light is 400 to 1,000 na
Monochromatic with those having a wavelength of Roh meter, sharp directivity, and can correctly detect the state of the rubber belt 2 surface for high degree of focusing.

At this time, the current taken out from the electrode is I
_{If 1} and I ₂ , the light quantity = I ₁ + I ₂ , and the displacement =
(I ₁ −I ₂ ) / (I ₁ + I ₂ + B). However,
B is the offset value of the amplifier. Therefore, when the reflected light from the normal portion of the rubber belt enters the center of the preset resistance layer, the currents I ₁ and I ₂ become equal and the displacement becomes zero. On the other hand, since the reflected light from the uneven portion of the rubber belt enters away from the center of the resistance layer, I ₁ and I ₂ are different, and displacement occurs. The defective portion can be found by detecting such a change in the displacement data.

Moreover, according to the present invention, the defective portion can be detected even when the change in the displacement (distance) data is small. That is, the laser light amount decreases when a defective portion is detected, but as shown in FIG. 3, when the absolute value of the laser light amount falls below a certain value, the displacement accuracy extremely decreases, and the displacement data is larger than the true value. Error occurs. That way, it is possible to detect the change was small portion of the original displacement data as a defect. For this reason,
In the present invention, it is necessary to set the light amount level in the vicinity of where the displacement accuracy starts to suddenly decrease. Further, since the deviation amount from the true value of the displacement data is determined by the offset value B of the displacement type amplifier, this value is fixed. In FIG. 3, the laser light amount (%) is calculated so that the maximum value that can be amplified by the amplifier is 100%.

In this way, cracks, cracks, dents, etc. are detected. First, as shown in FIG. 4, cracks, cracks, etc. are continuously detected by the runout value of the displacement data for a belt length of 1 mm. Then, the maximum value (PP value) is compared and evaluated with the determination value. In addition, as shown in FIG. 5, the dent detection calculates the average value of the displacement data of the constant section (a) and continuously compares it with the average value separated by the distance L to find the maximum of the measured values (difference). Evaluate the value against the judgment value.

The mark portion 8 is activated when the laser portion 7 detects cracks, chips, dents, etc. When an abnormal signal is detected, the cylinder incorporated therein is activated to cause the pen 38 to project. Put a linear mark on the defective portion of the surface of the rubber belt 2.

Next, the operation of the rubber belt appearance inspection device of the present invention will be described. First, the driven roll 11 of the belt traveling unit 3 is brought closer to the drive roll 10 side, and the rubber belt 2
Installed on the two rolls 10 and 11, then the driven roll 1
1 is separated from the drive roll 10 to apply tension to the rubber belt 2. After that, the belt positioning roll 4 is moved by the operation of the cylinder 25 and comes into contact with the surface of the rubber belt 2, and the rotating brush 27 and the fixed brush 28 of the brush portion 5 come into contact with the rubber belt 2. Then, the drive roll 10 rotates and the rubber belt 2 runs.

At this time, the laser section 7 of the laser processing section 6
The mark portion 8 is located at one end of the rubber belt 2, and the laser portion 7 is operated while moving toward the other end to inspect the surface of the rubber belt 2 for defects such as cracks, chips and dents. When the laser unit 7 detects a defective portion, the mark portion 8
The pen 38 of sticks out and puts a linear mark on the surface of the rubber belt 2.

When the inspection is completed, the rotation of the drive roll 10 is stopped, the driven roll 11 is brought closer to the drive roll 10 side, the belt positioning roll 4 is separated from the rubber belt 2, and then the rubber belt 2 is taken out.

[0023]

As described above, in the appearance inspection apparatus for a rubber belt of the present invention, the rubber belt is hung on the driving roll and the driven roll, and the belt is positioned in one direction by the belt positioning roll while running under a constant tension. To prevent the rubber belt surface from cracking, chipping, denting, etc. by preventing dust from adhering to the rubber belt surface by moving the brush section and contacting the running rubber belt surface. The defect can be inspected, and its position can be confirmed by marking the defective portion, which enables visual inspection in a state close to the visual judgment of the operator.

[Brief description of drawings]

FIG. 1 is a front view of a rubber belt appearance inspection device according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a graph showing the relationship between the level of laser light amount and displacement accuracy.

FIG. 4 is a diagram showing displacement data for detecting cracks and chips on the surface of a rubber belt.

FIG. 5 is a diagram showing displacement data for detecting a dent on the surface of a rubber belt.

[Explanation of symbols]

 1 rubber belt appearance inspection device 2 rubber belt 3 belt running part 4 belt positioning roll 5 brush part 6 laser processing part 7 laser part 8 mark part 10 drive roll 11 driven roll 27 rotating brush 28 fixed brush

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-308950 (JP, A) JP-A-63-135252 (JP, A) JP-A-63-180323 (JP, A) 21021 (JP, U) Actual development Sho 52-80688 (JP, U)

Claims (2)

[Claims] 1. An appearance inspection device for a rubber belt, which detects irregularities such as cracks, chips, and dents on the surface of an object to be inspected, which is made of a rubber belt. The rubber belt is hung on a driving roll and a driven roll, and is fixed. A belt running unit that runs under tension, a belt positioning roll that abuts the running rubber belt surface to prevent deviation of the rubber belt, and a brush that abuts the running rubber belt surface to remove dust and the like adhering to the rubber belt. Part, and the laser part that projects and receives light toward the surface of the rubber belt while moving along the width direction of the rubber belt hung on the driving roll and the driven roll, and a value outside the range of the judgment value was detected. And a laser processing part having a mark part for marking the surface of the rubber belt at times, and the light amount level of the laser part
And the displacement accuracy, the displacement accuracy drops sharply.
A light level is set nearby and the amount of deviation from the true value
Set the offset value of the amplifier so that
DOO appearance inspection apparatus of a rubber belt according to claim. 2. The brush part is composed of a rotary brush and a fixed brush.
The visual inspection device for a rubber belt according to claim 1, wherein