JPH0348487Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> The present invention relates to a hole measuring tool.

<Prior Art> It is often necessary in various fields to measure undulations such as holes and irregularities, and their three-dimensional shapes and positions. Moreover, if the hole 03 is located in a narrow place such as between two plate-like bodies that cannot be seen directly by humans, for example, as shown in FIG. , there is a need for a device that can be measured remotely by some method.

Traditionally, fiberscopes have been used to measure holes of this type.

<Problem that the invention aims to solve> However, even if a fiberscope is used, it is only possible to grasp the general condition of holes and unevenness.
At present, we have no choice but to give up on accurate measurement of its three-dimensional shape and position, including its dimensions.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a measuring tool that can accurately measure the shape and position of holes and irregularities remotely.

<Means for solving the problem> The configuration of the hole measuring tool of the present invention that achieves the above-mentioned purpose is to measure the shape of a hole in a structure that defines a narrow gap in cooperation with a surrounding body. , a supporting frame plate inserted into the gap, a measurement probe provided at the center of the frame plate and movable in a direction perpendicular to the surface facing the structure, and a frame surrounding the measurement probe. a plurality of surface tracing members distributed on a plate and extendable towards the surrounding body; a plurality of sensors arranged on the frame plate and detecting a distance between the frame plate and the structure; A sensor is provided on the frame plate close to the measurement probe and detects the presence of the hole, and the measurement probe is provided on the frame plate and moves in a direction perpendicular to the surface of the frame plate. a device;
A plurality of sensors are provided on the moving device on the circumference in a plane perpendicular to the moving direction of the moving device to detect the amount of movement of the moving device, and the tip engages the inner surface of the hole in the object to be measured to detect the center of the hole. It consists of a spring finger that is displaced in the direction and a sensor that detects the amount of displacement of each spring finger, and is characterized in that it outputs detection signals of the amount of movement and displacement as information on the inner surface shape and position of the hole. .

<Example> A hole measuring tool according to an example of the present invention will be described with reference to FIGS. 1 to 8.

In FIGS. 1 to 7, 101 is a measurement probe to be described later, and the end surface of the measurement probe 101 is fixed to a piston 103 that is housed in a cylindrical portion 102a of a supporting frame plate 102 and moves in the horizontal direction. There is. 104 is a water supply and drainage pipe for moving the piston 103. The frame plate 102 is equipped with a UT (ultrasonic) sensor 105 for detecting the position of the hole, and a UT (ultrasonic) sensor 105 for detecting the position of the hole.
etc.), UT sensors 107 and 108 for measuring the distance and wall thickness between objects with holes, and a fiberscope 109 for remotely observing the measurement site. installed. The frame plate 102 is connected to a support mechanism 110. Reference numerals 111 and 112 are surface tracing members, which are, for example, plate-shaped and which trace narrow gaps in objects with holes. For example, in FIG. 8, one surface tracing member 111 is pressed against the outer surface of the tub-shaped body 02, and the other surface tracing member 112 is pressed against the inner surface of the annular surrounding body 01. The surface copying member 112 is
Piston 11 moves horizontally by pressure water flowing in from hole 113a drilled in bottom plate 113
4 is attached. 115 is another piston, which is configured to move horizontally within the case 116. The surface copying members 111 and 112 are attached to the frame plate 102 so as to surround the measurement probe 101.

Next, the measurement probe 101 will be explained with reference to FIGS. 5 and 7. In these figures, 103 is a piston, and a fixed plate 2 is fixed to the piston 103.
A rod 6 of a magnetic encoder for measuring axial displacement is protruded at right angles through the rod. The encoder rod 6 also has a magnetic encoder head 5.
is slidably fitted. A spring 7 is attached between the encoder head 5 and the fixed plate 2 to maintain tension at all times. Reference numeral 4 denotes a plate-shaped stroke detection member, which is protruded from the tip of the encoder head 5 at right angles in the radial direction, and is movable in the axial direction along the encoder rod 6 together with the encoder head 5. There is. The outer diameter of the stroke detection member 4 is slightly larger than the diameter of the hole to be measured. 1 is a spring finger, which connects the piston 10 via a fixed plate 2.
3 protrudes at right angles. A plurality of spring fingers 1 (four in this example) are usually used,
It surrounds the encoder rod 6 and is arranged on a circumference centered on the axis of the encoder rod 6. The free end of the spring finger 1 is designed to be able to move in the radial direction with extremely light force, and a protrusion B facing outward is formed at the tip so that it can easily come into contact with the inner surface of the hole. 3 is a strain gauge;
It is attached to the side surface of each spring finger 1 and is sensitive to minute radial movement of the tip of the spring finger 1. In this embodiment, since two spring fingers 1 intersect with the stroke detection member 4, a window 4a is provided in the stroke detection member 4 to ensure free movement of the spring fingers 1.

Next, the effect will be explained. First, the measurement probe 101 attached to the frame plate 102 is
Accordingly, the tubular body 02 and its annular surrounding body 0 in FIG.
Insert it into the gap between 1 and 1. Next, pressure water is introduced through a hole 113a made in the bottom plate 113, and the surface copying member 112 is moved forward by the piston 114.
In FIG. 3, when the left end of piston 114 reaches the right end of another piston 115, this piston 1
15 moves forward, and the surface tracing member 112 moves toward the annular surrounding body 0.
1. Crimp. On the other hand, the surface tracing member 111 is pressed against the outer surface of the tank-like body 02, and the supporting mechanism 110
inserted into the gap by At this time, the proximity sensor 106 continues to monitor whether the measuring tool is held parallel to the outer surface of the tub-shaped body 02.
Note that a UT sensor may be used instead of the proximity sensor 106 to maintain parallelism. Next, the support mechanism 110 is moved up and down, back and forth, and left and right by manual or mechanical driving, and the UT sensor 105 guides the center of the measurement probe 101 to the center of the hole 03 of the tank-like body 02. Next, with the center of the measurement probe 101 aligned with the center of the hole 03 and the tool kept parallel to the tank, connect high pressure water to one side of the water supply and drainage pipe 104 and low pressure water to the other side to connect the piston. Advance 103. Accordingly, the measurement probe 101
2, and the hole is measured as described below. Also, if necessary, two UTs
The distances ₁ and ₃ between the annular surrounding body 01 and the tubular body 02 and the tool, as well as their wall thicknesses t ₁ and t ₂ are measured by the sensors 107 and 108 . Note that the gap between the two is determined from ₁ and ₃ and the gap ₂ between the UT sensors 107 and 108. In addition, remote visual observation is performed using a fiberscope 109 during the measurement work, if necessary.

The operation of the measurement probe 101 will be explained with reference to FIGS. 5 and 6. Now in FIG. 6, the tubular body 02
The hole 0 has a tapered portion that widens toward the outer surface.
Assume that 3 is open. Measurement probe 101
gradually approaches the hole 03, the tip of the stroke detection member 4 comes into contact with a point a on the outer surface of the hole 03. When the probe 101 continues to move forward, the stroke detection member 4 and the encoder head 5 move back together against the spring 7, while the outer end B of the spring finger contacts the point b of the tapered part of the hole 03. do. Further advancing, the outer end B of the spring finger 1 reaches point c of the straight hole along the hole diameter of the tapered portion and then transitions to point d on the inner surface.

Since the arrangement dimensions of the spring finger 1 are known in advance, the outer end B of the spring finger 1
If the amount of movement in the radial direction after reaching point b is known, the position and inner surface shape and dimensions of the hole 03 can be known. Here, the amount of movement of the outer end B of the spring finger 1 is accurately measured by the strain gauge 3. Furthermore, when the stroke detection member 4 comes into contact with the point a on the outer surface of the hole 03, the encoder rod 6 moves to the spring 7.
By moving forward in the axial direction of hole 03 against
The amount by which the outer end B of the spring finger 1 moves in the axial direction of the hole 03 is accurately measured. Furthermore, since the probe 101 is inserted into the hole 03 with the measuring tool parallel to the outer surface of the hole 03 and the center of the probe 101 aligned with the center of the hole 03, the position of the hole 03 can be accurately determined. Recognize. Thus, from the strain gauge 3 and encoder readings, b of hole 03,
The exact position of each point c and d in the radial and axial directions is determined. Furthermore, the position of point a can be found from the extension of point c and point b. That is, the position and three-dimensional shape of the hole 03 are determined.

Note that although the above description is about measuring holes, it can be similarly applied to measuring undulations such as unevenness.

<Effects of the invention> According to the invention, when inserting into a narrow space between two plate-like bodies disposed approximately in parallel to measure the position and diameter of a hole drilled in the plate-like bodies, Since the measurement probe can be inserted into the hole with the measurement tool parallel to the plate and the center of the measurement probe aligned with the center of the hole, the shape, size, and position of the hole can be accurately measured. The measuring tool of the present invention can be applied not only to simply measuring holes, but also to guiding devices such as processing tools that target holes in narrow and inaccessible locations and other uneven objects.

[Brief explanation of the drawing]

1 to 8 relate to one embodiment of the present invention, in which FIG. 1 is a sectional view of the entire tool taken along the line C-C in FIG. 2, and FIG. Figure 3 shows E- in Figure 2.
4 is a sectional view taken along the line F-F in FIG. 2, FIG. 5 is a sectional view of the measurement probe, FIG. 6 is a sectional view showing an example of a hole in the object to be measured, and FIG. The figure is a view in the direction of arrow A in FIG. 5, and FIG. 8 is a cross-sectional view of an example of an object having a hole requiring remote measurement. In the drawing, 01 is an annular surrounding body, 02 is a tank-like body (object to be measured), 03 is a hole, 1 is a spring finger,
2 is a fixed member, 3 is a strain gauge, 4 is a stroke detection member, 5 is a magnetic encoder head, 6 is a magnetic encoder rod, 7 is a spring, B is an outer end, 101 is a measurement probe, 102 is a frame plate , 10
3, 114, 115 are pistons, 104 are water supply and drainage pipes, 105, 107, 108 are UT sensors, 10
6 is a proximity sensor, 109 is a fiberscope, 1
10 is a support mechanism, 111 and 112 are surface copying members,
113 is a bottom plate, and 116 is a case.

Claims (1)

[Scope of utility model registration request] A device for measuring the shape of a hole in a structure that cooperates with an enclosing body to define a narrow gap, which includes a supporting frame plate inserted into the gap, and a support frame plate provided at the center of the frame plate to define a narrow gap. a measurement probe that moves in a direction orthogonal to a surface facing the surface; a plurality of surface tracing members that are distributed on a frame plate surrounding the measurement probe and are extendable toward the surrounding body; and the frame plate. a plurality of sensors disposed on the frame plate to detect the distance between the frame plate and the structure; and a sensor disposed on the frame plate close to the measurement probe to detect the presence of the hole; The measurement probe includes a moving device that is provided on the frame plate and moves in a direction perpendicular to the plane of the frame plate, a sensor that detects the amount of movement of the moving device, and a circumference in a plane perpendicular to the moving direction of the moving device. The moving device is provided with a plurality of spring fingers whose tips engage the inner surface of the hole of the object to be measured and are displaced toward the center of the hole, and a sensor that detects the amount of displacement of each spring finger. A hole measuring tool characterized by outputting detection signals of movement amount and displacement amount as information on the inner surface shape and position of the hole.