JP7281391B2 - V-BELT ANGLE MEASURING METHOD AND ANGLE MEASURING DEVICE - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle measuring method and an angle measuring device capable of calculating an angle of an inclined surface of a V-belt.

A V-belt is known as a friction transmission belt that transmits power. This V-belt has a friction transmission surface (V-shaped side surface: inclined surface) formed at a V angle, and is wound between a driving pulley and a driven pulley with tension applied, and the V-shaped side surface is the pulley. Power is transmitted by rotating between the pulleys (driving pulley and driven pulley) in contact with the V grooves.

There are two types of V-belts: the Raw-Edge type (Raw-Edge V-belt), in which the friction transmission surface (V-shaped side surface) is an exposed rubber layer, and the Wrapped type (Raw-Edge V-belt), in which the friction transmission surface is covered with a cover cloth. ) type (wrapped V belt). In addition, the low edge V-belt has cogs on the lower surface (inner peripheral surface) of the belt, or on both the lower surface (inner peripheral surface) and the upper surface (outer peripheral surface) to make it easier to bend. be.

Raw edge V-belts and low-edge cogged V-belts are used to drive auxiliary equipment in general industrial machinery, agricultural machinery, and automobile engines, and are also used as speed change belts in belt-type continuously variable transmissions in motorcycles and other vehicles. there is For low edge V-belts, short fibers are blended in the rubber layer to improve lateral pressure resistance against the pulleys, and the short fibers are added to the transmission surface to improve the slidability (coefficient of friction) with the pulleys. Sometimes exposed.

As described above, in order to reliably transmit power from the drive pulley side to the driven pulley side, the V-shaped side surface of the V-belt reliably contacts the V grooves of the pulleys (drive pulley and driven pulley). There is a need. That is, the inclination angle of the V-shaped side surfaces of the V-belt must match the inclination angle of the V-grooves of the pulleys.

Therefore, there is a need for a measuring method, a measuring device, etc. for measuring the inclination angle of the V-shaped side surface of the V-belt in the manufacturing process of the V-belt and in the state of wear due to use (see Patent Documents 1 to 4). .

Japanese Patent Application Laid-Open No. 2006-017703 Japanese Patent Application Laid-Open No. 2006-030168 Registered Utility Model No. 3125253 Registered Utility Model No. 3126827

However, in the method and measuring device for measuring the inclination angle of the V-shaped side surface of the V-belt described in Patent Documents 1 to 4, the measurement instrument directly contacts the V-belt to measure the inclination angle. In some cases, the V-shaped side surface of the V-belt is pressed and an accurate inclination angle cannot be measured. In addition, in the belt angle measuring device of Patent Document 4, since the inclination angle is obtained from the amount of displacement between any two measurement points on the V-shaped side surface of the V-belt, the operator can select the measurement points to determine the inclination angle. Variation occurs in the angle measurement value. Furthermore, since the inclination angle is measured by directly contacting the measuring instrument with the V-belt, it takes time to measure, resulting in low productivity.

Accordingly, it is an object of the present invention to provide an angle measuring method and an angle measuring device that can calculate the angle of the inclined surface of the V-belt in a non-contact manner and suppress variations in measurement by the operator.

In order to solve the above problems, the present invention irradiates the inclined surface of the fixed V-belt with laser light at predetermined intervals, and based on the reflected light, the width direction of the V-belt is the X axis, and obtaining a plurality of coordinate values with the thickness direction of the V-belt as the Y-axis;
calculating an approximate straight line based on the obtained plurality of coordinate values;
and calculating an inclination angle of the inclined surface of the V-belt based on an angle between the approximate straight line and a straight line in the width direction of the V-belt at the bottom of the V-belt. is an angle measurement method for measuring the inclination angle of

According to the above method, the inclination angle of the inclined surface of the V-belt can be measured without contact. In addition, since an approximation straight line that approximates the inclined surface of the V-belt is calculated based on a large number of coordinate values obtained at predetermined intervals for the inclined surface of the V-belt, the inclination angle of the inclined surface of the V-belt is calculated. In doing so, it is possible to suppress variations in each measurement. That is, it is possible to improve the measurement accuracy.

Further, according to the present invention, in the above-described angle measurement method, the step of setting an acceptable tilt angle range;
and determining that the calculated inclination angle of the inclined surface of the V-belt is within the acceptable inclination angle range.

According to the above method, since the acceptance range of the inclination angle of the V-belt is set in advance, it is possible to automatically determine the acceptance of the inclination angle of the V-belt.

Further, the present invention provides a mounting base for fixing the V-belt,
a light source capable of emitting laser light;
a light receiving unit capable of receiving the reflected light of the laser light;
and a controller for executing the following processes.
(a) The inclined surface of the V-belt fixed to the installation table is irradiated with the laser beam from the light source at predetermined intervals, and the width direction of the V-belt is set to X based on the reflected light received by the light receiving unit. A process of obtaining a plurality of coordinate values, with the axis and the thickness direction of the V-belt as the Y-axis;
(b) a process of calculating an approximate straight line based on the acquired plurality of coordinate values;
(c) A process of calculating the inclination angle of the inclined surface of the V-belt based on the angle formed by the approximate straight line and the straight line in the width direction of the V-belt at the bottom of the V-belt.

According to the above configuration, the inclination angle of the inclined surface of the V-belt can be measured without contact. In addition, since an approximation straight line that approximates the inclined surface of the V-belt is calculated based on a large number of coordinate values obtained at predetermined intervals for the inclined surface of the V-belt, the inclination angle of the inclined surface of the V-belt is calculated. In doing so, it is possible to suppress variations in each measurement. That is, it is possible to improve the measurement accuracy.

It is possible to provide an angle measuring method and an angle measuring device that can calculate the angle of the inclined surface of the V-belt in a non-contact manner and suppress variations in measurement by operators.

1 is a schematic top view of an angle measuring device according to the present embodiment; FIG. 1 is a schematic front view of an angle measuring device according to this embodiment; FIG. FIG. 10 is an explanatory diagram when the belt is set; FIG. 10 is an explanatory diagram when the belt is set; FIG. 5 is an explanatory diagram of an operation mode of a belt thickness pressing section; FIG. 4 is an explanatory diagram of an operation mode of a belt width pressing section; FIG. 4 is an explanatory diagram of a procedure for measuring a belt angle; It is a figure which shows the belt angle calculation result based on measurement data. FIG. 10 is an explanatory diagram of pass/fail judgment of the belt angle displayed on the monitor of the personal computer; It is an explanatory photograph of a conventional belt angle measuring device. FIG. 5 is a diagram showing belt angle calculation results based on measurement data using a conventional belt angle measuring device; 4 is a result of continuous measurement and a histogram, according to an example. 4 is a reset measurement result and histogram, according to an example.

(embodiment)
Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the angle measuring device 1 is used to measure the belt angles (corresponding to the inclined surfaces) of the V-shaped side surfaces 21 and 22 (corresponding to inclined surfaces) of the cog 20 portion of the endless low-edge cogged V-belt 2 ( "Inclination angle .theta.1 of V-shaped side surface 21"+"Inclination angle .theta.2 of V-shaped side surface 22"=(refer to belt angle) is measured.

(Raw edge cogged V belt 2)
The raw edge cogged V-belt 2 is a type of V-belt and is a friction transmission belt that transmits power. The low-edge cogged V-belt 2 is endless and has a plurality of cogs 20 on its inner peripheral surface so that it can be easily bent. 2, the raw-edge cogged V-belt 2, including the cog 20, has V-shaped side surfaces 21 and 22 having a predetermined inclination angle. In this embodiment, the low-edge cogged V-belt 2 is measured, but any V-belt can be measured. For example, it may be a raw edge V-belt, a wrapped V-belt, or a low-edge cogged V-belt in which cogs are provided on both the inner peripheral surface and the outer peripheral surface of the belt to facilitate bending.

(Configuration of Angle Measuring Device 1)
As shown in FIGS. 1 and 2, the angle measuring device 1 includes two square prism-shaped first support portions 3 that support one side surface of an endless low edge cogged V belt 2, and a low edge cogged V belt. Two square prism-shaped second support portions 4 that support the outer peripheral surface of the belt 2 are provided between the two second support portions 4, and the outer peripheral surface of the low edge cogged V-belt 2 is formed in an arc shape. A third support portion 5 (corresponding to an installation table) that supports from below while holding, a pair of stoppers 6 that support both sides in the belt longitudinal direction of the cog 20 portion to be measured for the belt angle, and a low edge cogs. A belt thickness pressing part 7 which can move and press the inner peripheral surface of the V-belt 2 in the belt thickness direction, and a belt thickness pressing part 7 which can move and press the other side surface of the low edge cogged V-belt 2 in the belt width direction. , a pair of belt width pressing portions 8, a laser displacement meter 9 that can move in the belt width direction on the inner peripheral surface side of the low edge cogged V belt 2, and a personal computer 10 that executes various operation controls etc. equivalent).

The belt thickness pressing portion 7 is moved downward (from the upper side to the lower side in FIG. 2) by controlling the operation of the hydraulic cylinder 71 in the vertical direction (the belt thickness direction) in accordance with a command from the personal computer 10, and is moved to the third support portion. The inner peripheral surface of the low-edge cogged V-belt 2 supported (placed) on 5 can be pressed. As a result, the low-edge cogged V-belt 2 can be fixed in the belt thickness direction between the third support portion 5 and the belt thickness pressing portion 7 .

In response to a command from the personal computer 10, the belt width pressing portion 8 is moved forward (from the right side to the left side in FIG. 1) by controlling the operation of the hydraulic cylinder 81 in the front-rear direction (the belt width direction). The other side surface of the raw edge cogged V-belt 2 supported by the support portion 3 can be pressed. As a result, the low-edge cogged V-belt 2 can be fixed in the belt width direction between the first support portion 3 and the belt width pressing portion 8 .

The laser displacement meter 9 has a light source 91 capable of irradiating the inner peripheral surface of the low-edge cogged V-belt 2 with laser light, and the laser light emitted from the light source 91 irradiates the inner peripheral surface of the low-edge cogged V-belt 2. A light receiving portion 92 capable of receiving reflected light is provided. Then, according to a command from the personal computer 10, the laser displacement meter 9 irradiates the inner peripheral surface of the low edge cogged V-belt 2 with a laser beam from a light source 91 while moving the hydraulic cylinder 93 forward and backward (belt width direction). It can be moved rearward (left to right in FIG. 1) by motion control.

As a result, the movement (displacement) of the laser displacement gauge 9 in the belt width direction by the hydraulic cylinder 93 can be measured as the position (displacement) of the low edge cogged V-belt 2 in the belt width direction (X shaft). In addition, the belt width of the laser displacement meter 9 is calculated from the distance (the distance between the laser displacement meter 9 and the inner peripheral surface of the low edge cogged V-belt 2) calculated based on the reflected light of the laser beam received by the light receiving unit 92. It is possible to measure (calculate) the thickness of the raw edge cogged V-belt 2 as it moves in the direction (Y-axis of measurement data to be described later). That is, it is possible to acquire coordinate values with the belt width direction of the low-edge cogged V-belt 2 as the X-axis and the belt thickness direction of the low-edge cogged V-belt 2 as the Y-axis. In this embodiment, as the laser displacement meter 9 moves in the belt width direction, a large number of coordinate values are obtained by irradiating the laser at predetermined intervals. Specifically, when the low-edge cogged V-belt 2 is measured from end to end in the belt width direction, approximately 20,000 coordinate values are obtained.

The personal computer 10 is a computer that supervises and manages the measurement operations and calculations of the angle measuring device 1 by means of software. It has

(Measuring method)
Next, the software of the personal computer 10 controls the operation of the angle measuring device 1, and the belt angle (shown in FIG. 2, " Inclination angle .theta.1 of V-shaped side surface 21"+"inclination angle .theta.2 of V-shaped side surface 22"=belt angle) will be described.

(1: belt set)
First, as shown in FIG. 3, the measurer placed the raw edge cogged V-belt 2 on two first support portions 3 (supporting one side surface of the raw edge cogged V-belt 2) and two second It is placed on the third support portion 5 so as to be supported by the second support portion 4 (supporting the outer peripheral surface of the raw edge cogged V-belt 2) (belt set). Before setting the belt, the type of V-belt to be measured, model number (size (width, thickness), type of use), etc. are input (condition setting).

Next, as shown in FIG. 4, while temporarily irradiating the inner peripheral surface of the low-edge cogged V-belt 2 with laser light from the light source 91 of the laser displacement meter 9, the measurer moves the low-edge cogged V-belt 2 to the second position. 3. Move (rotate) on the support 5 in the longitudinal direction of the belt, and set so that the cog 20 portion (apex portion) to be measured for the belt angle is irradiated with the laser beam. As a result, the cog 20 portion to be measured for the belt angle is arranged between the pair of stoppers 6 (approximately in the middle), and the pair of stoppers 6 supports both sides of the cog 20 portion in the longitudinal direction of the belt. Become.

Next, when the measurer inputs a command to start measurement into the personal computer 10, first, the belt thickness pressing section 7 is moved downward (from the upper side to the lower side in FIG. 5) by the operation control of the hydraulic cylinder 71. Both sides of the cogs 20 of the low-edge cogged V-belt 2 placed on the third support 5 are pressed in the longitudinal direction of the cogs 20 of which the belt angle is to be measured. As a result, the low-edge cogged V-belt 2 can be fixed in the belt thickness direction between the third support portion 5 and the belt thickness pressing portion 7 .

Next, the belt width pressing portion 8 is moved forward (from the right side to the left side in FIG. 6) by the operation control of the hydraulic cylinder 81, and the raw edge cogged V-belt supported by the two first support portions 3 2 (the right side of the low-edge cogged V-belt 2 shown in FIG. 5). As a result, the low-edge cogged V-belt 2 can be fixed in the belt width direction between the two first support portions 3 and the belt width pressing portion 8 .

(2: shape measurement)
Next, according to a command from the personal computer 10, the laser displacement meter 9 emits laser light from the light source 91 to the cog 20 of the low-edge cogged V-belt 2 to be measured for the belt angle. It moves to the rear side (from the left side to the right side in FIG. 1) by motion control. That is, the laser beam traverses the cog 20 portion (apex portion) of the low-edge cogged V-belt 2 where the belt angle is to be measured from end to end in the belt width direction.

Here, the movement (displacement) of the laser displacement meter 9 in the belt width direction by the hydraulic cylinder 93 is measured as the position (displacement) of the low-edge cogged V-belt 2 in the belt width direction. In addition, the belt width of the laser displacement meter 9 is calculated from the distance (the distance between the laser displacement meter 9 and the cog 20 of the low edge cogged V-belt 2) calculated based on the reflected light of the laser beam received by the light receiving unit 92. The thickness of the raw edge cogged V-belt 2 is measured (calculated) as it moves in the direction. That is, it is possible to obtain coordinate values where the belt width direction of the cog 20 portion of the low edge cogged V-belt 2 is the X axis and the belt thickness direction of the cog 20 portion of the low edge cogged V belt 2 is the Y axis. . In this embodiment, coordinate values of about 20,000 points are obtained by irradiating the laser at predetermined intervals as the laser displacement meter 9 moves in the belt width direction. The acquired coordinate values are transmitted to the personal computer 10 and stored in the storage device. Note that at least three coordinate values are preferably acquired.

(3: Shape display based on shape measurement results)
Next, according to the calculation of the personal computer 10, as shown in the measurement data of FIG. With the thickness direction as the Y-axis, approximately 20,000 obtained coordinate values are connected by lines, and the shape in the belt width direction of the cog 20 portion of the low-edge cogged V-belt 2 to be measured for the belt angle is obtained from the measurement data. is displayed on the monitor (shape measurement).

(4: belt angle calculation)
Next, as shown in FIG. 8, the personal computer 10, based on all the coordinate values obtained in the preset AB section in the belt thickness direction and the CD section in the belt width direction, An approximate straight line L1 corresponding to the inclination of one V-shaped side surface 21 of the raw-edge cogged V-belt 2 is calculated. Similarly, based on all the coordinate values obtained in the AB section in the belt thickness direction and the EF section in the belt width direction, which are set in advance, the other V shape of the low edge cogged V belt 2 An approximate straight line L2 corresponding to the inclination of the side surface 22 is calculated. In this embodiment, the approximate straight lines L1 and L2 are calculated using the method of least squares, but they may be calculated by a known calculation method. In addition, for the AB section in the belt thickness direction, the CD section in the belt width direction, and the EF section in the belt width direction, which are set in advance, the type of V-belt, model number (size (width, thickness), It is desirable to set the conditions in advance according to the type of use, etc. (in order to eliminate variations depending on the operator).

Next, the personal computer 10 calculates an angle θ (L) (V-shaped angle between side 21 and bottom 23). Similarly, the angle θ(R) (the angle between the V-shaped side surface 22 and the bottom portion 23) formed by the approximate straight line L2 and the straight line L3 is calculated. Here, a straight line parallel to the X-axis may be adopted as the straight line L3 corresponding to the belt width direction of the bottom portion 23 (inner peripheral surface) of the raw edge cogged V-belt 2 . Further, the straight line L3 is calculated as an approximate straight line based on all the coordinate values obtained in a predetermined section in the belt width direction (the section corresponding to the bottom portion 23 of the low-edge cogged V-belt 2) set in advance. good too.

Next, the personal computer 10 calculates a value obtained by subtracting 90° from the angle θ(L) formed by the approximate straight line L1 and the straight line L3 as the “tilt angle θ1” of the V-shaped side surface 21 . Similarly, the “tilt angle θ2” of the V-shaped side surface 22 is calculated by subtracting 90° from the angle θ(R) formed by the approximate straight line L2 and the straight line L3. Then, "tilt angle .theta.1"+"tilt angle .theta.2"="belt angle" (see FIG. 9) (angle calculation).

Specific values of the "inclination angle θ1", "inclination angle θ2", and "belt angle" calculated above are shown in FIG. 2, along with the shape and numerical values of the cog 20 in the belt width direction (values of belt width and belt thickness, etc.). These measurement data are transmitted to the host computer of the personal computer 10 and used for information management, performance collection, and analysis.

Next, the personal computer 10 determines whether or not the calculated "belt angle" is within a preset range of acceptable belt angles in terms of product standards (performance). In terms of product standards (performance), the range of acceptable belt angles is set and conditioned in advance in the personal computer 10 according to the type of V-belt, model number (size (width, thickness), usage pattern), etc. is desirable.

Then, when it is determined that the calculated "belt angle" is within the range of acceptable belt angles in terms of product standards (performance) set in advance, the monitor of the personal computer 10 displays "acceptable ” is displayed. If it is determined that the calculated "belt angle" is not within the acceptable range of belt angles, "failed" is displayed on the monitor of the personal computer 10. FIG. After that, the pass/fail judgment of the "belt angle", numerical results, etc. are stored and saved in the storage device.

For example, in terms of product standards (performance), when the range of acceptable belt angles is set in advance to "24° ≤ belt angle < 25°", the calculated "belt angle" is "24.48°". If so, "pass" is displayed on the monitor. On the other hand, if the calculated "belt angle" is "25.10°", "failed" is displayed on the monitor. As a result, since the pass range of the belt angle of the low-edge cogged V-belt 2 is set in advance, it is possible to automatically determine the pass of the belt angle of the low-edge cogged V-belt 2 .

In the above embodiment, the calculated belt angle is "tilt angle θ1" + "tilt angle θ2" = "belt angle". It may be defined as an angle such as the angle θ(L) formed by the approximate straight line L1 and the straight line L3, the angle θ(R) formed by the approximate straight line L2 and the straight line L3, or by a combination thereof. .

According to the angle measuring device 1 of the above embodiment, the inclination angles of the V-shaped side surfaces 21 and 22 of the low-edge cogged V-belt 2 can be measured without contact. Further, based on a large number of coordinate values obtained at predetermined intervals for the V-shaped side surfaces 21 and 22 of the low-edge cogged V-belt 2, an approximate straight line that approximates the V-shaped side surfaces 21 and 22 of the low-edge cogged V-belt 2 is provided. Since the L1 and the approximate straight line L2 are calculated, the "inclination angle θ1" of the V-shaped side surface 21, the "inclination angle θ2" of the V-shaped side surface 22, and the "inclination In calculating "angle θ1"+"inclination angle θ2"="belt angle", variation in each measurement can be suppressed. That is, it is possible to improve the measurement accuracy of the belt angle and the like.

Next, using the angle measuring device according to the present invention and a conventional belt angle measuring device (see Patent Document 4, etc.), the repeatability when the belt angle of the V-belt (low-edge cogged V-belt) is repeatedly measured (measured value difference) is evaluated.

(Belt angle measurement using a conventional belt angle measuring instrument)
Here, a procedure for measuring the belt angle of a V-belt (low-edge cogged V-belt) using a shape measuring machine (Contracer CV3000 manufactured by Mitutoyo) as a conventional belt angle measuring instrument will be briefly described.

First, as shown in FIG. 10, the V-belt is placed on a belt setting jig (belt setting), and the positions of the needle extending from the shape measuring machine and the part of the V-belt to be measured are aligned (condition setting).

Next, by moving the needle extending from the shape measuring machine along the belt width direction of the V-belt placed on the belt setting jig, the movement of the needle (displacement in the belt width direction and belt thickness directional displacement) is measured (shape measurement).

Next, according to the calculation of the personal computer, as shown in the measurement data of FIG. 11, the shape of the V-belt in the belt width direction, with the belt width direction of the V-belt as the X axis and the belt thickness direction of the V-belt as the Y axis, is Displayed on the monitor as measurement data.

Next, the measurer uses a personal computer (using dedicated software) to select any two points of the measurement data (points A and B ) to create a straight line L21 passing through the selected points A and B. Similarly, select any two points (points C and D) of the measurement data corresponding to the other V-shaped side surface of the V-belt, and create a straight line L22 passing through the selected points C and D (4 point selection).

Next, the personal computer determines the angle θ(L) between the created straight line L21 and the straight line L23 corresponding to the belt width direction of the bottom portion 23 (inner peripheral surface) of the V-belt (one V-shaped side surface and the bottom portion 23 ) is calculated. Similarly, the angle θ(R) between the straight line L22 and the straight line L23 (the angle between the other V-shaped side surface and the bottom portion 23) is calculated.

Next, the personal computer calculates a value obtained by subtracting 90° from the angle θ(L) formed by the straight lines L21 and L23 as the "tilt angle θ1" of one V-shaped side surface. Similarly, a value obtained by subtracting 90° from the angle θ(R) formed by the straight lines L22 and L23 is calculated as the "tilt angle θ2" of the other V-shaped side surface. Then, it is calculated as "inclination angle θ1" + "inclination angle θ2" = "belt angle" (angle calculation). Then, the calculated "belt angle" and the like are displayed on the monitor of the personal computer.

(V-belt to be measured)
In evaluating the measurement accuracy of the angle measuring device (laser) of the present invention and the conventional belt angle measuring device (conventional), a V-belt to be measured will be described. The V-belts to be measured were low-edge cogged V-belts, and three types shown in Table 1 were prepared (V-belt 1, V-belt 2, and V-belt 3).

(Evaluation method)
With the angle measuring device (laser) of the present invention and the conventional belt angle measuring device (conventional), belt angles of three types of V-belts (V-belt 1, V-belt 2, V-belt 3) were measured 20 times continuously. (Set the V-belt and press the measurement start command 20 times in succession to measure), and measure the difference (variation (R )) asked. Then, it was determined that the smaller the difference, the smaller the variation. Further, the average value of the measured belt angle for 20 times is calculated, and based on the difference in the average values (difference from the conventional one), the angle measuring device (laser) of the present invention is compared with the conventional belt angle measuring device (conventional). It was evaluated whether there is no inferiority compared to. The results of the continuous measurement and histogram are shown in FIG.

In addition, in the angle measuring device (laser) of the present invention and the conventional belt angle measuring device (conventional), the belt angles of three types of V-belts (V-belt 1, V-belt 2, V-belt 3) are measured for each measurement. After resetting, the measurement was performed 20 times (for each measurement, after resetting the V-belt, the measurement start command was pressed to measure). The reset measurement results and histogram are shown in FIG.

(evaluation)
In both continuous measurement and resetting measurement, the angle measuring device (laser) of the present invention showed less variation (R) than the conventional belt angle measuring device (conventional), and the measurement accuracy was equal to or higher than the conventional one.
As a factor for reducing the variation, the angle measuring device (laser) of the present invention measures the belt angle without the measuring instrument directly contacting the V-belt, so the V-shaped side of the V-belt etc. can be measured. It is conceivable that an accurate belt angle can be measured without pressing.

Further, in the angle measuring device of the present invention, the belt angle is calculated using an approximate straight line calculated from a large number of coordinate values obtained using a laser displacement meter. Variation (R) was able to be reduced compared to the vessel.

In addition, the difference in the average value of the belt angle (difference from the conventional one) is small, and the angle measuring device (laser) of the present invention can be evaluated as comparable to the conventional belt angle measuring device (conventional). rice field.

(Measurement of sanding specification V-belt)
In the angle measuring device (laser) of the present invention, in order to evaluate the belt angle measurement accuracy of a sanding specification V-belt (low edge cogged V-belt), the angle measuring device (laser) of the present invention and conventional belt angle measurement In the instrument (conventional), the belt angle of each of the three types of V-belts (see V-belt 4, V-belt 5, and V-belt 6 in Table 2) was reset for each measurement and measured 20 times (each measurement, After resetting the V-belt, the measurement start command was pressed to measure), the variation (R), and the difference in average value (difference from the conventional one) were measured. Table 3 shows the results of the measurement.

(evaluation)
The angle measuring device (laser) of the present invention had less variation (R) than the conventional belt angle measuring device (conventional), and the belt angle measurement accuracy was equal to or higher than the conventional one. Therefore, the angle measuring device (laser) of the present invention can measure the belt angle without any problem even if it is a sanding V-belt.

(Evaluation of measurement time)
Next, with the angle measuring device (laser) of the present invention and the conventional belt angle measuring device (conventional), the time required for measuring the belt angle of the V-belt once was measured. The results are shown in Tables 4 and 5. With the conventional belt angle measuring instrument, the total time for manual belt setting, manual condition setting, automatic shape measurement, manual 4-point selection, and automatic angle calculation was measured (see Table 4). Also, with the angle measuring device (laser) of the present invention, the total time for manual condition setting, semi-manual belt setting, automatic shape measurement, and automatic angle calculation was measured (see Table 5).

According to the measurement results in Tables 4 and 5, in the angle measuring device (laser) of the present invention, the time for measuring the belt angle can be significantly shortened compared to the conventional belt angle measuring device (conventional). I was able to confirm that it worked.

1 angle measuring device 2 raw edge cogged V-belt 20 cog 21 V-shaped side surface 22 V-shaped side surface 23 bottom portion 3 first support portion 4 second support portion 5 third support portion 6 stopper 7 belt thickness holding portion 8 belt width holding portion Part 9 Laser displacement gauge 91 Light source 92 Light receiving part 10 Personal computer L1, L2 Approximate straight line

Claims (3)

A laser displacement meter having a light source capable of irradiating laser light and a light receiving portion capable of receiving reflected light of the laser light is moved in the width direction of the fixed V-belt, and the inclination of the fixed V-belt is moved. The surface and the bottom are irradiated with laser light from the light source at predetermined intervals, and based on the reflected light received by the light receiving unit, the width direction of the V-belt is the X axis, and the thickness direction of the V-belt is the Y axis. a step of obtaining a plurality of coordinate values;
An approximate straight line corresponding to the inclined surface of the V-belt is calculated based on the plurality of coordinate values obtained in the section set according to the type and model number of the V-belt. , calculating an approximate straight line corresponding to the bottom of the V-belt based on the plurality of coordinate values obtained in the section corresponding to the bottom of the V-belt;
calculating the inclination angle of the inclined surface of the V-belt based on the angle between the calculated approximate straight line corresponding to the inclined surface of the V-belt and the calculated approximate straight line corresponding to the bottom of the V-belt; An angle measuring method for measuring an inclination angle of an inclined surface of the V-belt. setting an acceptable tilt angle range;
2. The angle measuring method according to claim 1, further comprising the step of making a pass judgment when it is determined that the calculated inclination angle of the inclined surface of the V-belt is within the acceptable inclination angle range. . an installation base for fixing the V-belt;
a laser displacement meter having a light source capable of irradiating a laser beam and a light receiving portion capable of receiving the reflected light of the laser beam;
a movement mechanism capable of moving the one laser displacement meter in the width direction of the V-belt fixed to the installation table;
An angle measuring device comprising: a control device in which the following processes are performed.
(a) The movement mechanism moves the one laser displacement meter in the width direction of the V-belt fixed to the installation table, and the laser beam from the light source is applied to the inclined surface and the bottom of the V-belt at predetermined intervals. and acquiring a plurality of coordinate values based on the reflected light received by the light receiving unit, with the width direction of the V-belt as the X axis and the thickness direction of the V-belt as the Y axis;
(b) an approximate straight line corresponding to the inclined surface of the V-belt , based on the plurality of coordinate values obtained in the section set according to the type and model number of the V-belt; and calculating an approximate straight line corresponding to the bottom of the V-belt based on the plurality of coordinate values acquired in the section corresponding to the bottom of the V-belt;
(c) A process of calculating the inclination angle of the inclined surface of the V-belt based on the angle between the calculated approximate straight line corresponding to the inclined surface of the V-belt and the calculated approximate straight line corresponding to the bottom of the V-belt. .

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