JP2020159880A - Measurement angle calibration device - Google Patents

Abstract

To provide a measurement angle calibration device that can accurately determine validity of a measurement value by an angle measurement device even with a simple construction.SOLUTION: In a state where tips of rods 6a and 6b of probes 4A and 4B staying alienated in an extension direction of a reference line BL and extending toward a surface S of a measurement workpiece W, orthogonally to the reference line BL, are in contact with a surface S, intervals L1 and L2 from the reference line BL to the surface S are detected by the probes 4A and 4B anchored by an anchorage 2 at a prescribed position, a verification value A2 of an incline angle A of the surface S with respect to the reference line BL is calculated by a computation unit 8 based on detection data on the intervals L1 and L2, and data on an alienation distance X in the extension direction of the reference line BL between the probes 4A and 4B, and the verification value A2 is compared with a measurement value A1 of the incline angle A measured by the an angle measurement device 11, using data different from data used upon calculating the verification value A2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a measurement angle calibrator, and more particularly to a measurement angle calibrator capable of accurately determining the validity of a measured value by the angle measuring device with a simple configuration.

Various angle measuring devices exist for measuring the tilt angle of the object to be measured (see, for example, Patent Document 1). In the angle measuring device proposed in Patent Document 1, the wheel of the vehicle is used as a measurement object, and the toe angle, camber angle, and the like of the wheel are measured. In this angle measuring device, the amount of movement of the pair of detection plates sandwiching the wheel is detected, and the inclination angle of the wheel with respect to the reference is calculated based on the detection data.

It is inevitable that a slight measurement error will occur in the value measured by the angle measuring device, but the measurement error is usually within an acceptable range. However, the measurement error of the measured value may exceed the permissible range due to deterioration / wear over time, the influence of the measurement environment, a sudden cause, and the like. Then, it is not easy to determine whether or not the measurement error of the measured value exceeds the permissible range. In order to judge this with high accuracy, a precise and complicated device is required. Therefore, there is room for improvement in easily and accurately determining the validity of the value measured by the angle measuring device.

Japanese Patent Application Laid-Open No. 60-1509

An object of the present invention is to provide a measuring angle calibrator capable of accurately determining the validity of a measured value by an angle measuring device with a simple configuration.

In order to achieve the above object, the measurement angle calibrator of the present invention is a measurement angle calibrator that calibrates the measured value of the inclination angle measured by the angle measurement device that measures the inclination angle of the surface of the object to be measured with respect to the reference line. There are a plurality of probes that have rods that move back and forth and detect the protrusion distance in the front-back direction of the rod based on the amount of movement of the rod back and forth, and a calculation unit that inputs detection data from each probe. The rods are separated from each other in the extending direction of the reference line and extend toward the surface at right angles to the reference line so that the tip of the probe is in contact with the surface. By fixing each of the probes at a predetermined position, the distance from the reference line to the surface is detected by each of the probes, and the detection data of the respective distances and the reference between the respective probes are detected. The verification value of the inclination angle is calculated by the calculation unit based on the data of the separation distance in the extending direction of the line, and the verification value is different from the data used when calculating the verification value. It is characterized in that the data is used to compare with the measured value measured by the angle measuring device.

According to the present invention, the measured value of the tilt angle measured by the angle measuring device and the verification value of the tilt angle calculated by the angle calibrator using data different from the data used by the angle measuring device for the measurement. By comparing, the validity of the value measured by the angle measuring device can be judged. Since both use data detected separately, reliable and accurate judgment is possible. In addition, the angle calibrator uses data on the distance from the reference line to the surface detected by a plurality of probes and data on the distance between the reference lines in the extending direction of the plurality of probes, so that the configuration is simple. However, it becomes easy to secure high detection accuracy.

It is explanatory drawing which illustrates the measurement angle calibration apparatus of this invention in a plan view. It is explanatory drawing which illustrates the measurement angle calibration apparatus of FIG. 1 from the side view.

Hereinafter, the measurement angle calibration device of the present invention will be described based on the embodiment shown in the figure.

The measurement angle calibration device 1 (hereinafter referred to as the calibration device 1) of the present invention illustrated in FIGS. 1 and 2 calibrates the measured value A1 of the inclination angle A measured by the angle measurement device 11. Specifically, the calibration device 1 is used to determine the validity of the measured value A1 of the inclination angle A of the surface S of the measurement object W with respect to the reference line BL measured by the angle measuring device 11.

The object W to be measured is not particularly limited, and there is an object W to be measured which is made of various materials such as metal, resin, rubber, and wood and has various shapes and structures. In this embodiment, the metal cylinder is the measurement object W. The alternate long and short dash line CL in FIG. 1 indicates the central axis of the object W to be measured. The central axis of the measurement object W is supported by the support pillar WP, and the surface S of the outer peripheral surface of the measurement object W is inclined at an inclination angle A with respect to the central axis CL in a plan view. That is, the reference line BL and the central axis CL are parallel to each other in a plan view.

The calibration device 1 has a plurality of probes 4A and 4B, a calculation unit 8 into which detection data from the probes 4A and 4B are input, and a fixture 2 for fixing the probes 4A and 4B at predetermined positions. In this embodiment, the calibration device 1 further includes a temperature sensor 9. The detection data by the temperature sensor 9 is input to the calculation unit 8. The drive source of the calibration device 1 is a battery 10, and each device is operated by the electric power of the battery 10.

The fixture 2 is a so-called magnet stand having a base 3a provided with a magnet and a support column 3b erected on the base 3a. The fixture 2 is firmly fixed to the metal installation location by the magnetic force of the magnet provided on the base 3a, and is removable. A fixture 2 having a clamp mechanism or the like is used for an installation location where the magnet does not work (does not attach).

Since a plurality of probes 4A and 4B are required, three or more probes can be provided, but two probes as in this embodiment are sufficient. The probes 4A and 4B have cylinders 5a and 5b, rods 6a and 6b, and contact balls 7a and 7b, respectively. Rods 6a and 6b are housed in the cylinders 5a and 5b so as to be movable back and forth. Contact balls 7a and 7b are rotatably held at the tips of the rods 6a and 6b, respectively. Each of the probes 4A and 4B detects the protrusion distance of the rods 6a and 6b in the front-rear direction from the cylinders 5a and 5b based on the amount of movement of the rods 6a and 6b.

The cylinders 5a and 5b are attached to the columns 3b. In this embodiment, the cylinders 5a and 5b are attached to one fixture 2, but the structure may be such that they are attached to separate fixtures 2. That is, the probes 4A and 4B may be attached to independent and separate fixtures 2, respectively.

A computer is used as the calculation unit 8. In addition to the detection data by the probes 4A and 4B and the detection data by the temperature sensor 9, the calculation unit 8 also inputs the data of the measurement value A1 by the angle measuring device 11.

Next, an example of a procedure for calibrating the measured value A1 using the calibration device 1 will be described.

As illustrated in FIG. 1, the measurement object W is inclined at a certain inclination angle A with respect to the reference line BL parallel to the central axis CL. The inclination angle A is measured as a measured value A1 by the angle measuring device 1.

In the calibration device 1, the rods 6a and 6b are separated from each other by a predetermined interval X in the extending direction of the reference line BL, and extend orthogonally to the reference line BL toward the surface S of the measurement object W. Let me. The tips (contact balls 7a, 7b) of the rods 6a and 6b are set in contact with the surface S. In this set state, the probes 4A and 4B are fixed at predetermined positions P1 and P2 by the fixture 2. It is preferable that the probes 4A and 4B have substantially constant heights and are set at substantially the same height positions as each other.

If rotatable contact balls 7a and 7b are provided at the tips of the rods 6a and 6b, the rods 6a and 6b will be attached to the rods 6a and 6b even if the measurement object W moves after the rods 6a and 6b are set as described above. Load is unlikely to occur. Along with this, it is advantageous to maintain the set state of the rods 6a and 6b. In this embodiment, the tips (contact balls 7a, 7b) of the rods 6a and 6b are brought into contact with the surface S already inclined at the inclination angle A, and the surfaces S from the reference line BL by the probes 4A and 4B, respectively. The intervals L1 and L2 up to are detected.

The procedure is not limited to this, and the measurement target body W may be tilted to the tilt angle A after the tips (contact balls 7a, 7b) of the rods 6a and 6b are brought into contact with the surface S. .. In this case, the distances L1 and L2 from the reference line BL to the surface S are subsequently detected by the probes 4A and 4B, respectively.

Data at a predetermined interval X and detection data by the respective probes 4A and 4B are input to the calculation unit 8. The coordinates of the predetermined positions P1 and P2 and the lengths (tip positions) of the cylinders 5a and 5b are known, and these data are input to the calculation unit 8. Therefore, the intervals L1 and L2 from the predetermined positions P1 and P2 to the surface S are detected by the respective probes 4A and 4B. Based on the difference between the detected intervals L1 and L2 and the separation distance X, the calculation unit 8 calculates the verification value A2 using the following equation (1) (interval L1 ≤ interval L2).
Tan (verification value A2) = (L2-L1) / X ... (1)

Next, the measured value A1 and the verification value A2 are compared by the calculation unit 8. The data of the reference range C for determining that the measured value A1 is appropriate is input to the calculation unit 8. The reference range C is set based on the magnitude of the difference between the measured value A1 and the verification value A2. The reference range C is set, for example, −0.01 ° ≦ (measured value A1-verification value A2) ≦ 0.01 °. This reference range C is set to an appropriate numerical range in which reliability can be ensured by performing a preliminary test or the like. If the measured value A1 satisfies the reference range C, the measured value A1 is determined to be valid, and if not satisfied, the measured value A1 is determined to be invalid.

The measured value A1 is measured by the angle measuring device 11 using data different from the data used when calculating the verification value A2. That is, the measured value A1 is measured using data detected at a position different from the position where the tips (contact balls 7a, 7b) of the probes 4A and 4B are in contact with each other. Alternatively, the measured value A1 is measured using data detected by a method different from the method using a plurality of probes 4A and 4B. Specifically, the measurement is performed using the rotation angle of the object W to be measured, or the data of the distance from the reference line BL to the surface S detected by a non-contact type sensor such as ultrasonic waves.

As described above, in this calibration device 1, the verification value A2 is compared with the measurement value 1 measured by the angle measuring device 11 using data different from the data used when calculating the verification value A2. The validity of the measured value A1 can be judged. Since the measured value A1 and the verification value A2 use separately detected data, highly reliable and accurate judgment becomes possible. Further, in the calibration device 1, the data of the distances L1 and L2 from the reference line BL detected by the plurality of probes 4A and 4B to the surface S and the distance between the plurality of probes 4A and 4B in the extending direction of the reference line BL are separated. Since the data of the distance X is used, it is easy to secure high detection accuracy while the configuration is simple.

In this embodiment, the temperature sensor 9 detects the ambient temperature of the probes 4A and 4B when the intervals L1 and L2 from the reference line BL to the surface S are detected by the probes 4A and 4B. The temperature-dependent data of the detection data by the probes 4A and 4B is input to the calculation unit 8 in advance. Therefore, the detection data by the probes 4A and 4B is corrected by the calculation unit 8 based on the temperature dependence data and the ambient environment temperature data of the probes 4A and 4B input to the calculation unit 8. That is, correction is performed to eliminate the influence of the ambient temperature of the probes 4A and 4B from the detection data of the probes 4A and 4B. This correction makes the detection data by the probes 4A and 4B more accurate. Along with this, it becomes advantageous to judge the validity of the measured value A1 more accurately.

In this embodiment, the probes 4A and 4B can be detachably fixed at a predetermined position where the magnet works by the fixture 2, so that the detection data by the probes 4A and 4B can be obtained in the field of various environments. As described above, an appropriate fixture 2 may be adopted according to the material of the installation position and the like. Along with this, the versatility of the calibration device 1 is increased.

The drive source of the calibration device 1 can be an AC power source, but by using the battery 10 as a drive source, detection data by the probes 4A and 4B can be obtained even in various environments where the AC power source cannot be used. That is, since the calibration device 1 can be transported and moved to a required place to perform measurement quickly and easily, the versatility of the calibration device 1 is increased.

The calibration device 1 of the present invention can use various cylindrical bodies as measurement objects W. For example, it is very versatile because it can be used for calibrating the inclination angle of rubber rolls, steel rolls, etc. used in test equipment, manufacturing equipment, conveyor equipment, and the like.

1 Measurement angle calibration device 2 Fixture 3a Base 3b Support 4A, 4B Probe 5a, 5b Cylinder 6a, 6b Rod 7a, 7b Contact ball 8 Calculation unit 9 Temperature sensor 10 Battery 11 Angle measurement device W Measurement target S Surface BL Reference line A Tilt angle A1 Measured value A2 Verification value

Claims (4)

A measurement angle calibrator that calibrates the measured value of the tilt angle measured by the angle measuring device that measures the tilt angle of the surface of the object to be measured with respect to the reference line.
It has a rod that moves back and forth, and has a plurality of probes that detect the protrusion distance in the front-back direction of the rod based on the amount of movement of the rod back and forth, and a calculation unit that inputs detection data by each of the probes. And
The respective rods are separated from each other in the extending direction of the reference line and extend toward the surface at right angles to the reference line so that the tip of the probe is in contact with the surface. Is fixed at a predetermined position, the distance from the reference line to the surface is detected by each of the probes, and the detection data of each distance and the extending direction of the reference line between the probes. The verification value of the inclination angle is calculated by the calculation unit based on the data of the separation distance of
The measurement is characterized in that the verification value is compared with the measurement value measured by the angle measuring device using data different from the data used when calculating the verification value. Angle calibrator. Each probe has a temperature sensor that detects the ambient temperature of each probe when the distance from the reference line to the surface is detected, and the detection data by the temperature sensor and the detection data of each probe The measurement angle calibration device according to claim 1, wherein the verification value is corrected by the calculation unit based on the temperature dependence data of the detection data. The measuring angle calibration device according to claim 1 or 2, wherein each of the probes is fixed to the predetermined position by using a magnetic force, and the probe fixture is detachable from the predetermined position. The measuring angle calibration device according to any one of claims 1 to 3, wherein the driving source is a battery.

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