JPH0812043B2 - Inner diameter measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an inner diameter measuring device, and more particularly to an inner diameter measuring device that accurately measures the inner diameter of a measured object in a production line.

[Conventional technology]

A conventional inner diameter measuring device is disclosed in JP-A-61-57805. The inner diameter measuring device includes a pair of movable members supported in an openable and closable manner in the casing, a pair of measuring elements supported by these movable members, and a detector for detecting the opening / closing amount of the pair of movable members. I have it.

This inner diameter measuring device is provided with a pair of measuring elements provided with a measuring member that comes into contact with the object to be measured, and each measuring member is brought into contact with the inner peripheral surface of the master piece, and the expanded position of the movable member at that time is detected by a detector. Then, the measured value of the inner diameter of the master piece is stored as a reference value, and the inner diameter of the object to be measured can be measured based on this reference value.

[Problems to be solved by the invention]

However, in the conventional inner diameter measuring device, when the probe is inserted into the measuring hole of the object to be measured, there is a possibility that the inner diameter measuring device and the measuring hole may not be kept coaxial. In this state, if the measuring element of the inner diameter measuring device is inserted into the measuring hole and the measuring element is brought into contact with the measuring hole to perform measurement, there is a problem that it causes a measurement error.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an inner diameter measuring device capable of obtaining a highly accurate measurement value by arranging the inner diameter measuring device and the measurement hole on a coaxial line. .

[Means for solving problems]

The present invention, in order to achieve the above object, a device body,
A measuring element having a base end swingably supported in the apparatus body and capable of contacting the inner peripheral surface of the object to be measured, and an elastic body for urging the measuring elements so as to expand the diameters of the measuring elements to the outside. A detector for measuring the distance between the measuring elements, a first actuating member for reducing the diameter of the measuring element toward the inside against each other against the urging force of the elastic body, and an equal distance on the circumference of the object to be measured. At least three claws that come into contact with the inner peripheral surface, a second actuating member that expands or reduces the diameter of the three claws, and a first actuating member that is axially movable in the apparatus body. It is characterized by having a first drive rod and a second drive rod which is arranged in the apparatus main body so as to be movable in the axial direction and drives a second actuating member.

[Action]

According to the present invention, in addition to the tracing stylus, a claw that moves in the radial direction is provided. By moving the claws radially outward, the object to be measured and the axis of the inner diameter measuring device can be arranged on the same line. Further, since the first drive rod and the second drive rod can be moved independently, the first drive rod is moved after the inner peripheral surface of the object to be measured is aligned with the claw. The probe can be brought into contact with the inner peripheral surface. Therefore, highly accurate measurement values can be obtained.

Further, since the probe and the claw can be respectively expanded or reduced in diameter, it is possible to measure a wide range of hole diameter dimensions with one inner diameter measuring device. Therefore, even if the size of the measurement hole is wide, it is not necessary to change the setup of the inner diameter measuring device, so that the measurement efficiency can be improved.

〔Example〕

Hereinafter, preferred embodiments of the inner diameter measuring device according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, an inner diameter measuring device 10 according to the present invention.
Is composed of a device body 12 and a floating portion 14.

The device main body 12 has a casing 15, and elastic members 16, 16 are fixed to a wall surface 15A of the casing 15 via bolts 18, 18, 18, 18, as shown in FIGS. 2 and 3. Has been done. The elastic members 16 and 16 swing up and down around the fulcrums 16A and 16A. The proximal ends of the pair of levers 20, 20 are connected to the elastic member 16 via bolts 22, 22. Also,
As shown in Fig. 1, there is a spring between the levers 20 and 20.
24 is arranged in a compressed state and urges the levers 20, 20 in the direction of separating them (outward in the radial direction). Further, as shown in FIGS. 1 and 4, the upper lever 20 is provided with an electric micrometer.
A bobbin 26 of 25 is fixed, and a coil 28 is fixed to the lower lever 20. Thereby, the amount of displacement between the levers 20 and 20 can be detected. A concave portion 20A is formed near the tip of the lever 20, and the right wall surface thereof is formed by a tapered surface 20B. Further, a flange portion 20C is formed at the tip portion. A probe 32 is connected to the flange portion 20C via a connecting rod 30.

On the other hand, on the left side of the casing 15 in FIG.
The cylinder 34 is connected to a switching valve (not shown) and an air supply source (not shown) via the first tube 36 and the second tube 38. A first piston 40 is slidably supported in the cylinder 34, and the left ends of rods 42, 42 are connected to the piston 40 as shown in FIG. As shown in FIGS. 5 and 6, holding plates 44, 44 are fixed to the right end portion of the rod 42 with bolts 46, 46.
A support plate 4 is provided between the sandwiching plates 44, 44 via bolts 49, 49.
8 and 48 are sandwiched, and a pin 50 is fixed to the central portion of the support plate 48 with the tip portion 50A protruding. Therefore, when the first piston 40 moves to the right in FIG. 1, the pins 50, 50
Also moves to the right, and the taper surface 2
It moves to the surface of the lever 20 via 0B. In this case, pin 50
Since the taper surface 20B is pressed by the tip end portion 50A, the diameter of the lever 20 is reduced. When the piston 40 moves to the left,
50 is located in the recess 20A, and the lever 20 expands in diameter by the urging force of the spring 24.

Further, as shown in FIGS. 1 and 5, the first piston
Inside the 40, a second piston 52 is slidably supported. The right end of the spring 53 is locked to the second piston 52, and the left end of the spring 53 is locked to the first piston 40. Therefore, the support surface 40A of the first piston 40 and the second piston 52 are urged by the urging force of the spring 53.
The first piston 40 and the second piston 52 move integrally as they abut with the contact surface 52A.

The left end of the rod 54 is connected to the second piston 52. A frame 56 is connected to the right end of the rod 54. A rod 58 is connected to the frame body 56, and a taper piece 60 is fixed to a substantially central portion of the rod 58. Taper piece
As shown in FIG. 7, the 60 includes tapered portions 60A, 60A, 60
A and 60A are formed at intervals of 90 °, and the tapered portion 60A is fitted to the moving piece 64 via the tapered groove 62. Further, as shown in FIG. 5, a claw 66 is fixed to the moving piece 64. Therefore, the claws 66, 66, 66, 66 are arranged at 90 ° intervals as shown in FIG. Also, nails 66, 66, 66,
66 expands or contracts in diameter in the radial direction as the taper piece 60 moves in the axial direction. Further, as shown in FIG. 5, claws 66, 66,
The claw tips 66A, 66A, 66A, 66A of the 66, 66 are formed parallel to each other.

Further, in FIG. 1, a floating portion 14 is formed on the left side of the cylinder 34. The floating part 14
It has a fixing member 68. A flange portion 68A is formed in the fixing member 68, and holes 68B, 68B, 68B, 68B are formed in the flange portion 68A as shown in FIG. Further, as shown in FIG. 1, a moving member 70 is arranged in the opening 68C of the fixed member 68 so as to be vertically movable via bearings 72, 72 ,. Further, the upper end of the spring 74 is locked on the upper side of the fixed member 68, and the lower end of the spring 74 is locked on the lower side of the moving member 70. Therefore, the moving member 70 is biased upward by the spring 74. In the opening 70A of the moving member 70, the protrusion 7 integral with the cylinder 34 is formed.
6 is inserted. As a result, the apparatus main body 12 can be moved by a minute distance in FIG. 1 with respect to the fixed member 68 via the bearings 72, 72 ...

The inner diameter measuring device according to the present invention configured as described above will be described.

First, the claw tips 66A, 66A, 66A, 66A and the contact points 32, 32
And are reduced in diameter, and these are inserted into the object to be measured. That is, by operating a switching valve (not shown), air is supplied from an air supply source (not shown) into the cylinder 34 through the tube 36, and the first piston 40 and the second piston 52 are moved to the right in FIG. Move in the direction. In this case, the first piston 40 and the second piston 52 are integrally moved to the right by the biasing force of the spring 53. Therefore, the rod 58 moves rightward together with the rod 54 and the frame 56, and at the same time, the rod 42 moves rightward. By moving the rod 58, the taper piece 60 moves to the right,
Since the moving piece 64 moves inward in the radial direction by the movement of the taper piece 60, the claw tip portion 66A also moves inward in the radial direction to reduce the diameter.

On the other hand, when the rod 42 moves to the right, the pin 50 also moves to the right via the holding plate 44 and the support plate 48. Therefore, the tapered surface 20B is pressed by the tip portion 50A of the pin 50 and the lever 20 moves inward in the radial direction.
The tracing stylus 32 fixed to is moved inward in the radial direction to be reduced in diameter. In this state, the tracing stylus 32, 32 and the claw tips 66A, 66A, 66A, 66A are inserted into the inner peripheral surface of the master piece.

Next, in order to measure the inner diameter of the inner peripheral surface of the master piece, the claw tips 66A, 66A, 66A, 66A and the probes 32, 32 are expanded in diameter. That is, the air is passed through the tube 38 to the cylinder 34
Then, the first piston 40 and the second piston 52 are moved to the left side in FIG. In this case, the first piston 40 and the second piston 52 are integrally moved leftward by the biasing force of the spring 53. Therefore, the rod 58
54, the frame 56 and the rod 42
Moves to the left. The movement of the rod 58 moves the taper piece 60 to the left, and the movement of the taper piece 60 moves the moving piece 64 outward in the radial direction. As a result, the claw tip portion 66A also moves outward in the radial direction to expand its diameter, and contacts the inner peripheral surface of the master piece to align it.

On the other hand, together with the rod 58, the rod 42 moves leftward,
Move pin 50 to the left. Therefore, the tip 50 of the pin 50
Since A moves leftward along the tapered surface 20B and is located in the recess 20A, the lever 20 moves radially outward by the biasing force of the spring 24 and expands in diameter. As a result, the tracing stylus 32 expands radially outward through the connecting rod 30, and contacts the inner peripheral surface of the master piece.

In this case, the tracing stylus 32, 32 has the nail tips 66A, 66A, 66.
It is set so as not to contact the inner peripheral surface of the master piece before the A and 66A contact the inner peripheral surface of the master piece. Therefore, when the claw tips 66A, 66A, 66A, 66A come into contact with the inner peripheral surface of the master piece and are aligned, the second piston 52
Cannot move to the left, but at this time, contact points 32, 32
Is not yet in contact with the inner peripheral surface of the master piece, the first cylinder 40 can move leftward against the biasing force of the spring 53. As a result, the tip of the nail
The probe 3 is attached to the inner surface of the master cylinder aligned with 66A.
2, 32 abut.

As a result, the inner diameter measuring device and the master piece can be set on the same line, and the probes 32, 32 can be brought into contact with the inner peripheral surface at a constant pressure. In this state, the inner diameter of the master piece is measured by the detector 25 and stored as a reference value. By measuring the inner diameter of the object to be measured by the same operation, the measured value can be obtained and compared with the reference value, and the inner diameter of the work 80 can be sequentially measured.

When the work 80 is a lightweight one, the work 80 moves to align the axis of the inner diameter measuring device with the axis of the work 80.
At the same time when the moving member 70 of the floating portion 14 moves while contacting the inner peripheral surface of 0, the axis of the inner diameter measuring device 10 and the work
You can match the 80 axis.

Further, since the contact points 32, 32 and the claw tips 66A, 66A, 66A, 66A can be respectively expanded or reduced in diameter, a wide range of hole diameters can be measured by one inner diameter measuring device. Therefore, even if the measurement hole size is wide,
There is no need to change the setup.

〔The invention's effect〕

As described above, according to the inner diameter measuring device of the present invention, the claw is first brought into contact with the inner peripheral surface of the measured object, and then the probe is brought into contact with the inner peripheral surface of the measured object. The inner diameter measuring device can be held coaxially. Therefore, a highly accurate measurement value can be obtained.

Further, since the probe and the tip of the claw can be expanded or reduced in diameter respectively, a wide range of measurement hole dimensions can be measured without changing the setup of the inner diameter measuring device, and the measurement efficiency can be improved. .

Further, since it has a floating portion, it is possible to obtain a highly accurate measured value even when the object to be measured is not accurately positioned.

[Brief description of drawings]

FIG. 1 is a sectional view of an inner diameter measuring device according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view of a main part of the inner diameter measuring device according to the present invention, and FIG. 1 is a sectional view taken along the line BB of FIG. 1, and FIG. 5 is a sectional view of the apparatus body of the inner diameter measuring apparatus according to the present invention,
6 is a sectional view taken along line CC of FIG. 1, and FIG. 7 is taken along line D- of FIG.
D sectional drawing, FIG. 8 is a EE arrow view of FIG. 1, and FIG. 9 is a FF arrow view of FIG. 10 ... Inner diameter measuring device, 12 ... Device body, 14 ... Floating part, 15 ... Casing, 20 ... Lever, 20A ... Tapered surface, 2
4, 70 ... Spring, 25 ... Detector, 32 ... Measuring element, 34 ... Cylinder, 40, 52 ... Piston, 42, 54, 64 ... Rod, 56 ...
Frame, 50 ... pin, 50A ... pin tip, 60 ... taper piece, 60A
… Taper part, 64… Moving piece, 66… Claw, 66A… Claw tip part, 68
… Fixed member, 70… moving member.

Claims (2)

[Claims] 1. A device main body, a probe whose base end is swingably supported in the device main body, and a probe capable of abutting on an inner peripheral surface of an object to be measured, and a probe which expands the diameter outwardly of each other. An elastic body for urging the measuring element, a detector for measuring the distance between the measuring elements, a first actuating member for reducing the diameter of the measuring element inward against each other against the urging force of the elastic element, and the like on the circumference. At least three claws arranged at intervals and in contact with the inner peripheral surface of the object to be measured, a second actuating member for expanding or reducing the diameter of the three claws, and arranged so as to be movable in the axial direction within the apparatus main body. A first drive rod for driving the first actuating member, and a second drive rod for arranging the second actuating member so as to be axially movable within the main body of the apparatus. measuring device. 2. The inner diameter measuring device according to claim 1, wherein the device body is floatingly supported by an elastic body, and the device body is movable in a direction orthogonal to an axis of the device body.