JPH04160303A - Measuring apparatus of bore - Google Patents

Abstract

PURPOSE:To detect the position of the inner surface of a cylindrical body in the radius direction and to measure the bore in a non-contacting manner by inserting and moving a measuring arm into the cylindrical body in the radius direction, and positioning a surface to be measured within the measurable range of a laser distance sensor. CONSTITUTION:Measuring arms 6a, 6b are mounted in a manner to be movable up and down to a strut 5 erecting on a movable stage 4. Each arm 6a, 6b is provided with a laser distance sensor 7 which has a prism 8 at a front end thereof so as to deflect the optical path of the sensor 7 in the radius direction of a pipe 1 to be measured. The arms 6a, 6b are inserted into the pipe 1 and moved in the radius direction to position the surface to be measured within the measurable range of the sensors 7. The position of the inner surface is detected from the diametrical position of the arms 6a, 6b and the measured values of the sensors 7. By detecting the position of the inner surface in the radius direction, the inner diameter of the pipe 1 can be measured in a non- contacting manner. Moreover, by deflecting the optical path of the sensors 7 in the radius direction of the pipe 1, even the pipe 1 of small diameter can be measured if only end parts of the arms 6a, 6b are inserted into the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an apparatus for measuring the inner diameter of a cylindrical body such as a pipe.

Conventional technology Conventionally, when measuring the inner diameter of pipes such as cast pipes,
Measurements are performed manually using a measuring device such as a micrometer, or by pressing a contact such as a roller against the inner surface of the pipe to measure the amount of movement of the contact.

Problems that the invention aims to solve However, methods in which measurements are performed manually using a micrometer or the like have problems such as inefficiency and easy measurement errors, and there are limits to the improvement of measurement accuracy and reliability. Ta.

Furthermore, the method of measuring the amount of movement of a contactor has a problem in that it is easily affected by wear and tear and external force because it is a contact type.

Therefore, using a non-contact measuring device such as a laser distance sensor may be considered, but in that case, the measuring device must be inserted into the pipe to take measurements, which poses the problem that it cannot be applied to small-diameter pipes. there were.

Therefore, the present invention solves this problem and provides an inner diameter measuring device that is non-contact and can be applied to small-diameter cylindrical bodies. The purpose is to provide

Means for Solving the Problems In order to achieve the above objects, the present invention provides a measurement arm that can be inserted into a cylindrical body to be measured, is relatively movable in the axial direction, and is movable in the radial direction. A laser distance sensor is arranged to measure distance in the axial direction of the cylindrical body to be measured, and a reflection means is provided at the tip of the measuring arm to bend the optical path of the laser distance sensor in the radial direction of the cylindrical body to be measured. It is something that

Effect With this configuration, by inserting the measuring arm into the cylindrical body to be measured and moving it in the radial direction, the surface to be measured can be positioned within the measurable range of the laser distance sensor. The inner surface position can be measured from the radial direction position 1 and the measured value by the distance sensor, and the inner diameter can be measured by measuring the inner surface position in the diametrical direction. In addition, since the distance sensor is arranged to measure distance in the axial direction, and its optical path is bent in the radial direction by the reflecting means, it is possible to insert the tip of the measuring arm equipped with the reflecting means. It is also possible to measure small diameter cylindrical bodies.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

In FIG. 2 showing the overall configuration, reference numeral 1 denotes a pipe to be measured such as a cast iron pipe whose inner diameter is to be measured, and is supported rotatably around a fixed axis by a plurality of pairs of support rollers 2, and is attached to the end of the pipe. It is positioned in the axial direction by matching positioning rollers 3. Reference numeral 4 denotes a movable stand movable in the axial direction of the tube to be measured 1, and a pair of upper and lower measuring arms 6a, 6b are attached to a support column 5 erected on the movable stand 4 so as to be movable up and down. These measurement arms 6a, 6b extend toward the tube 1 to be measured in its axial direction.

As shown in FIG. 1, each of the measurement arms 6a, 6b is provided with a laser distance sensor 7 to measure the distance in the axial direction of the tube to be measured 1.
A prism 8 is provided at the tip of the prism 8 for bending the optical path of the distance sensor 7 in the radial direction of the tube 1 to be measured.

According to the above configuration, the prisms 8 at the tips of the measurement arms 6a and 6b are inserted into the tube to be measured 1, and
After moving the measurement arms 6a and 6b in the radial direction so that the inner surface to be measured is located within the measurable range of the laser distance sensor 7 (for example, 80 m + ± 15 degrees), the digit 1 of each surface to be measured is By measuring with each distance sensor 7, the inner diameter of the surface to be measured of the tube 1 to be measured can be measured. That is,
The distance between the distance sensors 7.7 of each measurement arm 6a, 6b is xo, and the measurement value by each distance sensor 7 is Xt,
2, the inner radius is given by D=XO×X, +X2.

In the measurement, the pipe to be measured 1 is sequentially and intermittently rotated to measure a plurality of locations, and the average value is taken as the measured value of the inner diameter. Furthermore, the eclipse state can be detected based on the difference between the maximum value and the minimum value of the measured values.

Further, according to the above configuration, the distance sensor 7 is arranged to measure the distance in the axial direction of the tube 1 to be measured, and the optical path is bent in the radial direction by the prism 8 for measurement. If the tips of the measuring arms 6a and 6b provided with the measuring arms 8 can be inserted into the tube to be measured 1, measurement can be performed, so it is also possible to measure the inner diameter of the tube to be measured 1 having a small diameter.

Next, a specific configuration example will be explained with reference to FIG. 3. A measuring arm 6a extends from the lower part of the lifting table 10 which is attached to the column 5 of the movable table 4 so as to be able to rise and lower.A measuring arm 6a extends from the lower part of the lifting table 10, which is attached to the column 5 of the movable table 4 so as to be able to rise and lower. A support bracket 12 for the drive means 11 is provided. The elevating table 10 is driven up and down by a feed screw mechanism 14 by an elevating drive motor 13 at the upper end of the support column 5, and is configured such that the vertical position of the elevating table 10 is detected by an encoder 15. Further, the vertical drive means 11 slidably guides a pair of guide rods 16 extending upward from the base of the measurement arm 6b by bearings 17 provided on the support bracket 12, and also guides the pair of guide rods 16.
A rack shaft 18 extending upward from between 6 and 6 is vertically driven by a vertical drive motor 19, and its vertical position is detected by an encoder 20.

Further, the positioning roller 3 is attached to a movable block 22 that is movable along a guide shaft 21 in the axial direction of the tube 1 to be measured. The tip of a piston rod of a cylinder device 24 attached to the support column 5 via a mounting bracket 23 is connected to this movable block 22 via a bracket 25. A cylinder device with a brake is used as the cylinder device 24, and the cylinder device 24 is configured to insert a predetermined amount of the ends of the measurement arms 6a, 6b into the tube 1 to be measured.

In this specific configuration example, by moving the movable table 4 according to the length of the tube to be measured 1, the positioning roller 3 is also moved and positioned. to position the lower measuring arm 6a, and the vertical drive motor 1 is connected to this measuring arm 6a.
By moving the measuring arm 6b up and down via the rack shaft 18 at 9, the distance sensor 7 of each measuring arm 6a, 6b is positioned at approximately a predetermined position with respect to the surface to be measured of the pipe 1 to be measured. Ru. Also, a measurement arm 6a.

6b can be quickly inserted into the pipe to be measured 1 using the cylinder device 24 with a brake, and measurement can be carried out efficiently.

In the above embodiment, an example was shown in which the prism 8 was used as the reflecting means, but it goes without saying that a reflecting mirror may also be used.
6b, but using a single measurement arm,
The inner diameter can also be measured by rotating the measuring arm and the tube 1 to be measured 180 degrees relative to each other and measuring the inner surface position.

Furthermore, it is also possible to insert three or more measurement arms into the tube to be measured 1 and simultaneously measure three or more inner surface positions to measure the inner diameter.

Effects of the Invention As described above, according to the present invention, the measurement arm is inserted into the cylindrical body to be measured and moved in the radial direction to position the surface to be measured within the measurable range of the laser distance sensor. Since the inner surface position can be measured from the radial position of the arm and the measurement value from the distance sensor, the inner diameter can be measured by measuring the inner surface position in the diametrical direction.Also, since a laser distance sensor is used, it is possible to measure the inner diameter without contact. Measurements can be made without being affected by wear, etc. Furthermore, if the tip of the measuring arm equipped with a reflecting means can be inserted into the cylindrical body to be measured, it is possible to measure small-diameter cylindrical bodies. Effects such as this can be obtained.

[Brief explanation of drawings]

FIG. 1 is a front view showing a schematic configuration of essential parts of an embodiment of the present invention, FIG. 2 is a front view showing the overall schematic structure, and FIG. 3 is a front view showing the specific structure. 1... Pipe to be measured, 6a, 6b... Measurement arm, 7.
...Laser type distance sensor, 8...prism. Agent Yoshihiro Morimoto Figure 7 Figure 2-116-

Claims (1)

[Claims] 1. A measurement arm is provided that can be inserted into the cylinder to be measured, relatively movable in the axial direction, and movable in the radial direction, and a laser distance sensor is attached to this measurement arm to measure distance in the axial direction of the cylinder to be measured. What is claimed is: 1. An inner diameter measuring device, characterized in that the measuring arm is arranged so as to perform the following: and a means for bending the optical path of the laser distance sensor in the radial direction of the cylindrical body to be measured is provided at the tip of the measuring arm.