JP2003148901A - Measuring device for tube inside diameter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a measurement in a short time without damaging the inside surface of a tube. SOLUTION: This device has a truck 11 runnable on the inside surface of the tube by rolling a caster, an inside diameter measuring instrument 13 capable of measuring the inside diameter of the tube by allowing both end parts thereof to abut on the inside surface of the tube, and a linear guide 12 mounted on the truck to support the inside diameter measuring instrument to be movable along the longitudinal axis. The truck 11 is provided with a lever 2 for supporting the caster 24 to be capable of rising and falling and switching the caster between a lowered position for running and a raised position for measurement, and two or more positioning pins 25 which abut on the inside surface of the tube, when switching the caster to the raised position, to adjust the position and attitude of the inside diameter measuring instrument 13, and constituted so that one end of the inside diameter measuring instrument is separated from the inside surface TN when the caster is switched to the lowered position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring the inner diameter of a tube, and more particularly to a measuring device capable of easily measuring the inner diameter of a long cylinder tube.

[0002]

2. Description of the Related Art Conventionally, a fluid pressure cylinder device operated by hydraulic pressure or pneumatic pressure has been used in construction machines, civil engineering machines, general industrial machines and the like. The reliability and durability of the fluid pressure cylinder device largely depend on the material of each part and the processing dimensional accuracy.

Now, in a fluid pressure cylinder device having a large stroke, the cylinder tube used therein is also long. In order to manufacture a long cylinder tube, it is necessary to measure the inner diameter of the tube with high accuracy.

Conventionally, a general measuring instrument for measuring the inner diameter of a tube has a shaft whose both ends are in contact with the inner peripheral surface of the tube and expands and contracts according to the inner diameter, and the expansion and contraction amount of the shaft in the axial direction. It is composed of a rod which is converted into a movement amount and transmitted, and a gauge which is attached to the tip portion of the rod.

With the tube placed horizontally (horizontal position), both ends of the shaft of the measuring instrument are brought into contact with the inner peripheral surface, and the rod is placed so that the center of the shaft passes through the axial center position of the tube. Hold it and measure the inner diameter by looking at the gauge while slightly moving the rod vertically and horizontally. When the measurement at one point in the axial direction is completed, the measuring instrument is moved in the axial direction while holding the rod, and the measurement is performed at a plurality of points in the axial direction by the same method as above.

[0006]

In the conventional measuring instrument described above, the rod must be operated to maintain the posture of the shaft so that both ends of the shaft are correctly positioned at the measuring positions of the inner diameter. Therefore, it took a lot of time for measurement.

Also, when the measuring instrument is moved to perform measurement at a plurality of points in the axial direction of the tube, the end of the shaft may hit the inner peripheral surface of the tube strongly and damage the inner peripheral surface. There was a nature. Therefore, it is necessary to move the measuring instrument slowly and carefully, and it takes a lot of time for measurement.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a measuring device capable of performing measurement in a short time without damaging the inner peripheral surface of the tube.

[0009]

The device according to the present invention is a device for measuring the inner diameter of a tube, wherein the caster rolls on the inner peripheral surface of the tube so as to move in the axial direction of the tube. A trolley that can be run along, an inner diameter measuring device capable of measuring the inner diameter of the tube by contacting both ends with the inner peripheral surface of the tube, and the trolley is attached to the inner diameter measuring device. A linear guide movably supported along an axis in the longitudinal direction, the trolley supports the caster so that the caster can move up and down, and the caster has a lowered position for traveling and a raised position for measurement. And a position switching device for switching the caster to a raised position and contacting the inner peripheral surface of the tube to adjust the position and posture of the inner diameter measuring device. A-decided Me pin, is provided, when the caster is switched to the lowered position, one end portion of the internal diameter measurement device is configured away from said inner peripheral surface.

Preferably, the inner diameter measuring device is provided with a shaft movably supported in the axial direction by the linear guide, and is provided at one end of the shaft so as to come into contact with the inner peripheral surface of the tube. A measuring element, a gauge provided at the other end of the shaft, and an axial position that is adjustable with respect to the shaft, and contact the linear guide to regulate the axial position of the measuring element. And an adjustment stopper for.

Further, the carriage is provided with a traveling shaft for pulling and traveling the carriage and an operation wire for operating the position switching device. Further, the gauge has a sensor that outputs a signal according to the size of the inner diameter of the tube, and an indicator that displays based on the signal from the sensor.

[0012]

1 is a front view of a measuring apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a side view of the measuring apparatus 1.

In these figures, the measuring device 1 comprises a carriage 11, a linear guide 12, and an inner diameter measuring device 13. The dolly 11 includes a frame 21 having a rectangular shape in plan view, four levers 22, 22 ... Rotatably attached to the side surfaces of the frame 21 by shafts 23, 23. Attached casters 24, 24 ... Lever 2 connecting two levers 22
6 and an arm 27 that rotatably connects the levers 26 to each other. The casters 24 are made of a soft material such as synthetic rubber or synthetic resin.

In the truck 11, the caster 24 rolls on the inner peripheral surface TN of the tube TB, so that the tube T
It is possible to travel along the axial direction of B. The rotation of the lever 22 moves the caster 24 up and down. That is, by rotating the lever 22, the position of the caster 24 is switched between the lowered position for traveling and the raised position for measurement. Therefore, the lever 22 corresponds to the position switching device of the present invention.

Further, the carriage 11 has an inner peripheral surface T of the tube TB when the casters 24 are switched to the raised position.
Four positioning pins 25, 25 ... For maintaining the posture of the dolly 11 are attached so that the inner diameter measuring instrument 13 contacts the N and passes through the axis of the tube TB. Each of the positioning pins 25 is made of a metal material and has a smooth rounded tip. You may perform surface treatment in order to improve slidability. Therefore, even if it abuts on the inner peripheral surface TN, the inner peripheral surface TN is not damaged.

Further, a carriage shaft 28 for pulling the carriage 11 to travel and a manipulation wire 29 for manipulating the lever 22 are attached to the carriage 11. The linear guide 12 is attached to the center of the frame 21. The linear guide 12 supports the inner diameter measuring device 13 so as to be movable along its longitudinal axis.

Both ends of the inner diameter measuring device 13 are tubes TB.
It is possible to measure the inner diameter of the tube by contacting the inner peripheral surface TN of the tube. The inner diameter measuring device 13 includes a shaft 31, a tracing stylus 32, a gauge 33, an adjustment stopper 34, and the like.

The shaft 31 is supported by the linear guide 12 so as to be movable in the axial direction. The tracing stylus 32 is provided at the lower end, which is one end of the shaft 31, and can come into contact with the inner peripheral surface of the tube TB.

The gauge 33 is provided at the upper end, which is the other end of the shaft 31. The gauge 33 includes a tracing stylus 331 that is biased by a spring (not shown) and can move in and out, a sensor 332 that outputs a pulse signal of a number corresponding to a moving distance of the tracing stylus 331, an electric wire 333 that transmits the signal, and a sensor 3.
The display device 334 has a display unit 334 that counts pulse signals from 32 and displays a numerical value.

Since the tip of the tracing stylus 331 is smooth and the urging force is not strong, even when the tracing stylus 331 moves in contact with the inner circumferential surface TN of the tube TB, the inner circumferential surface TN is damaged. I can't get it.

The display 334 can be preset and reset, and by calibrating with a separately prepared reference gauge or master gauge, the accurate value of the inner diameter of the tube TB can be displayed numerically. is there. It is also possible to display “0” when the value is the same as the reference value of the reference gauge or the like and display the deviation from the reference value as a numerical value.

The adjustment stopper 34 is provided so as to surround the shaft 31, and is fixed to the shaft 31 by tightening screws provided at both ends thereof. By loosening the screw, the shaft 31 can be moved in the axial direction, and the axial position can be adjusted. The adjustment stopper 34 contacts the upper end surface of the linear guide 12 to regulate the axial position of the tracing stylus 32.

That is, when the caster 24 is in the raised position for measurement, the frame 21 is lowered accordingly, and the four positioning pins 25 are moved to the inner peripheral surface T of the tube TB.
Abut on N. As a result, the entire inner diameter measuring device 13 descends, and the tip of the probe 32 contacts the inner peripheral surface TN. At this time, there is a slight gap between the adjustment stopper 34 and the upper end surface of the linear guide 12 (the state shown in FIG. 1).

When the casters 24 are in the lowered position for traveling, the frame 21 accordingly rises, the four positioning pins 25 separate from the inner peripheral surface TN of the tube TB, and the upper end surface of the linear guide 12 moves. The adjustment stopper 34 abuts and lifts the entire inner diameter measuring instrument 13 upward. As a result, the tracing stylus 32 separates from the inner peripheral surface TN. Therefore, in this state, the dolly 11 is caster 2
4, the positioning pin 25 and the tracing stylus 32 are separated from the inner peripheral surface TN even when traveling, so that the inner peripheral surface TN is not damaged.

In the measuring device 1 having the above-described structure, the lever 22 is operated by the operator pulling the operating wire 29 by hand.
Rises and the casters 24 descend to the lowered position. In this state, the carriage 11 can be run by pulling or pushing the handle at the tip of the travel shaft 28. Since the positioning pin 25 and the tracing stylus 32 do not contact the inner peripheral surface TN during traveling, the inner peripheral surface TN
Will not hurt. The tracing stylus 331 has an inner peripheral surface T
Although it contacts N, the inner surface TN is not scratched because the surface of the tracing stylus 331 is smooth and the biasing force is weak.

The carriage 11 is brought to an appropriate axial position in the tube TB, and the operation wire 29 is loosened there.
Then, due to the weight of the frame 21 etc., the lever 2
2 rotates, and the frame 21 descends. This causes the casters 24 to be in the raised position. At this time, the positioning pin 25 comes into contact with the inner peripheral surface TN, the position and posture of the inner diameter measuring device 13 are properly aligned, and the inner diameter of the tube TB can be measured. At this time, the traveling shaft 28 may be operated and finely adjusted so as to have a more accurate position or posture. The measurer reads and records the display on the display 334.

Then, the caster 24 is moved to the lowered position by pulling the operation wire 29, and the traveling shaft 28 is pulled to pull the cart 1.
Run 1 to the next measurement position. After that, the measurement is repeated in the same manner as above.

Thus, the inner diameter of the inner peripheral surface TN of the tube TB can be measured accurately and easily in a short time without damaging the inner peripheral surface TN. Since the measurement is performed in a short time, the error due to the temperature change is reduced. Moreover, since the indicator 334 can be drawn out of the tube TB by the electric wire 333, the measurement value can be easily read.

Since a long rod, unlike the conventional one, is not used for the inner diameter measuring instrument 13, no error occurs due to bending of the rod or temperature change. In the above embodiment, when the operation wire 29 is loosened, the frame 21 is lowered by its own weight such as the frame 21.
A tension spring or the like may be provided so that the 2 can easily rotate. The shaft 31 may be replaced with one having a different length depending on the inner diameter of the tube TB.

In addition, the structure, shape, size, number, material and the like of the whole or each part of the measuring device 1 can be appropriately changed in accordance with the gist of the present invention.

[0031]

According to the present invention, it is possible to carry out the measurement in a short time without damaging the inner peripheral surface of the tube.

[Brief description of drawings]

FIG. 1 is a front view of a measuring device according to an embodiment of the present invention.

FIG. 2 is a side view of the measuring device.

[Explanation of symbols]

1 Measuring device 11 dolly 12 Linear guide 13 Inner diameter measuring instrument 22 Lever (position switching device) 24 casters 25 Positioning pin 28 Running shaft 29 Operation wire 31 shaft 32 probe 33 gauge 331 probe 332 sensor 334 Display 34 Adjustment stopper TB tube TN inner peripheral surface

Claims (4)

[Claims] 1. A device for measuring the inner diameter of a tube, comprising a carriage that can travel along the axial direction of the tube when a caster rolls on the inner peripheral surface of the tube, and both ends are An inner diameter measuring device capable of measuring the inner diameter of the tube by abutting on the inner peripheral surface of the tube, and an inner diameter measuring device attached to the carriage and movably supported along the longitudinal axis thereof. A linear position guide for the caster, and a position switching device for supporting the caster so that the caster can move up and down and switching the caster between a lowered position for traveling and a raised position for measurement. A plurality of positioning pins for contacting with the inner peripheral surface of the tube to adjust the position and posture of the inner diameter measuring device when switched to a raised position; When Yasuta is switched to the lowered position, one end portion of the internal diameter measurement device is configured away from said inner peripheral surface, that the measuring device of the inner diameter of the tube, characterized in. 2. The inner diameter measuring device comprises a shaft movably supported in the axial direction by the linear guide, and a measuring device provided at one end of the shaft and capable of contacting an inner peripheral surface of the tube. A child, a gauge provided at the other end of the shaft, and an axial position adjustable with respect to the shaft, for abutting the linear guide to regulate the axial position of the probe. 2. The tube inner diameter measuring device according to claim 1, further comprising: 3. The tube according to claim 1, wherein the carriage is provided with a traveling shaft for pulling and traveling the carriage, and an operation wire for operating the position switching device. Inner diameter measuring device. 4. The gauge according to claim 1, further comprising a sensor that outputs a signal according to the size of the inner diameter of the tube, and an indicator that displays based on the signal from the sensor. Tube inner diameter measuring device.