JP2000146564A - Precision confirmation device for contact system measuring instrument of tube inner diameter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily confirm precision of a measuring instrument of the inner diameter of a tube which can measure the inner diameter without being affected by color and gloss of the inner surface of the tube and size of the form. SOLUTION: An inner diameter measuring sensor device 28 is provided with a first measuring sensor 30 far measuring the position in the vertical direction of an instrument main body 29, a sensor part 32 which is mounted on the tip of a lance 31 to be inserted in a tube and can abut against the inner surface of the tube, an elastic body for energizing a lance pedestal supporting the lance 31 toward the outside of the tube radial direction, and a second measuring sensor for measuring a vertical distance from a reference position in the main body 29 to the sensor part 32. A master piece device 37 is installed which moves a master piece 38 having a reference inner diameter size between a precision confirmation position facing the sensor device 28 and a standby position. A function circuit which measures the inner diameter to the master piece 38 before measuring operation to a tube 12 to be inspected is installed in a control unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for measuring the inner diameter of a pipe, and more particularly, to a precision checking apparatus for a contact type inner diameter measuring apparatus.

[0002]

2. Description of the Related Art In a conventional apparatus for measuring the inner diameter of a tube, as shown in FIG. 9, a pair of laser displacement meters 2 are arranged toward an opening of a tube 1 to be inspected, and a pair of prisms 3 are inserted into the tube. ,
The beam of each laser displacement meter 2 emitted in the direction of the tube axis is deflected in the tube radial direction, and the distance X1 from each prism 3 to the inner surface of the tube,
X2 is measured, and the distance X0 between the optical axes of both laser displacement gauges 2 is added to the measured value, and the inner diameter d of the socket of the inspection target tube 1 is calculated.
I was seeking.

[0003]

In the above-described conventional configuration, when the laser displacement meter 2 is used, the state of reflection changes depending on the color and gloss of the inner surface of the tube. Although a coating film is formed on the inner surface of the tube, the coating film is not uniform in color and has different color spots and gloss depending on portions. This becomes noise and causes an error in the measured value.

In addition, it is necessary to maintain the positional relationship between the prism 3 and the laser displacement meter 2 strictly, and it is necessary to take care not to cause bending or the like of a member supporting the two.
If the member supporting the prism 3 is lengthened in order to measure a deep position in the tube, the shape becomes large to secure the strength of the member, and it becomes difficult to insert the member into a small-diameter tube. Since the laser spot applied to the inner surface of the tube is small, it is necessary to accurately apply it to the measurement location. However, the mechanical positioning accuracy of the prism 3 is coarser than the spot diameter, so that the spot is sometimes located at an incorrect location. there were.
When there was a groove-shaped concave portion on the inner surface of the tube, the bottom of the groove was rough due to the difficulty in processing, and it was not possible to obtain a reliable reflected light of the laser, and measurement was not possible. In addition, the work of checking the accuracy of the laser displacement meter 2 is troublesome, and it is difficult to perform the work in a short time within the cycle of the measurement work.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and a contact-type inner diameter measuring device capable of easily confirming the accuracy of a contact-type tube inner diameter measuring device capable of measuring without being affected by the color, gloss, and shape of the inner surface of the tube. An object of the present invention is to provide an accuracy checking device for a pipe inner diameter measuring device.

[0006]

In order to solve the above-mentioned problems, an accuracy checking apparatus for a contact-type pipe inner diameter measuring apparatus according to the present invention comprises:
A traveling trolley device that reciprocates along the axis of the pipe to be inspected, a pair of elevating pedestal devices that are vertically spaced apart on the traveling trolley device, and an inner diameter measurement sensor device provided on the elevating pedestal of each elevating pedestal device, A control device for controlling each drive of the traveling trolley device and the elevating pedestal device; each inner diameter measuring sensor device includes a first measuring sensor for measuring a vertical position of the device main body; a lance inserted into a pipe; A sensor part that can be attached to the tip of the tube and that can contact the inner surface of the tube, a lance pedestal that supports the lance and that can be raised and lowered on the apparatus main body, In a contact-type pipe inner diameter measuring device having an elastic body that presses against the base member and a second measuring sensor that measures a vertical distance from a reference position in the device main body to the sensor portion, a reference inner diameter dimension is provided in front of the traveling bogie device. Provide a master piece device that moves the master piece equipped with the accuracy check position and the retreat position facing the inner diameter measurement sensor device and moves back and forth, and the control device measures the inner diameter of the master piece prior to the operation of measuring the inner diameter of the pipe to be inspected. Are provided.

[0007] With the above configuration, the control device performs an accuracy check operation prior to a normal measurement operation. At the time of accuracy confirmation, drive the lifting pedestal device so that each lance of each inner diameter measurement sensor device can be inserted inside the master piece,
The height of the lifting pedestal is adjusted so that the lances of the inner diameter detection sensor device are located close to each other on the center side of the master piece. The master piece device is driven to place the master piece at an accuracy check position on the traveling track of the traveling vehicle, and correspond to the inner diameter detection sensor device.

Next, with the sensor portions provided at the tips of both lances being located at predetermined positions, each lifting pedestal device is driven to separate both inner diameter measuring sensor devices up and down, so that each lance is The sensor is pressed against the inner surface of the master piece. When each inner diameter measuring sensor device moves while the sensor portion is in contact with the inner surface of the master piece, each lance pedestal moves from the initial position against the urging force of the elastic body, and the lance and the sensor portion move from the reference position of the device main body. Move relatively.

When the movement of the lance and the sensor section is detected by the second measurement sensor, the respective lifting pedestal devices are stopped. Each of the first measuring sensors measures the moving distance of the apparatus main body, each of the second measuring sensors measures the moving distance of the lance and the sensor unit from the reference position, and adds the measured values of each of the first measuring sensors. An operation of subtracting the measurement value of the two measurement sensor is performed to determine the inner diameter of the master piece, and the calculated value is compared with the reference inner diameter of the master piece to confirm the accuracy of the inner diameter measurement sensor device.

The master piece device is driven to retreat the master piece from the traveling track of the traveling vehicle to the retracted position,
By driving the lifting pedestal device, each lance of each inner diameter measuring sensor device can be inserted into the pipe to be inspected, and each lance of the inner diameter detecting sensor device approaches each other to the center side of the pipe to be inspected. Adjust the height of the lifting pedestal so that it is positioned.

At the time of measurement, the traveling bogie device is driven, the lance and the sensor unit are inserted into the tube to be inspected, and the measuring operation of the tube to be inspected is performed in the same procedure as that at the time of checking the accuracy.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 4, a pipe rotation supporting device 11 includes a plurality of rolling rollers 13 that horizontally support a pipe 12 to be inspected.
And rotationally drives the tube 12 to be inspected around the axis. The tube pressing cylinder 1 is positioned above the tube 12 to be inspected.
4 and a pressing roller 15 is provided on a tube pressing cylinder 14.

A face plate device 16 is arranged at a position in front of the pipe 12 to be inspected. The face plate device 16 has a face plate 17 which can be moved back and forth in the axial direction of the tube and can contact the pipe end face. It has a face plate cylinder 18 for driving the plate 17 in and out, and a face plate linear sensor (not shown) for measuring a moving distance of the face plate 17 from a reference position. The face plate 17 has an opening 17a in the center. U with
It is shaped like a letter.

In front of the tube 12 to be inspected in the tube axis direction,
A traveling trolley device 19 that reciprocates along the pipe axis direction is provided. The traveling trolley device 19 has a traveling trolley 22 that travels by being screwed into a ball screw 21 driven by a servomotor 20.

A support frame 23 erected on a traveling carriage 22
Is provided with a pair of elevating pedestal devices 24.Each elevating pedestal device 24 has an elevating pedestal 27 that is screwed up and down with a ball screw 26 driven by a servomotor 25. It is located up and down. The servo motor 25 and the ball screw 26 of both lifting pedestal devices 24 are located in parallel, the lifting pedestal 27 of one lifting pedestal device 24 is screwed into its own ball screw 26, and the other lifting pedestal device 24
The lifting pedestal 27 of the other lifting pedestal device 24 is screwed into its own ball screw 26, and the ball screw 26 of one lifting pedestal device 24 is lifted and lowered independently, and each is independently raised and lowered. And move up and down with each other.

Each lifting pedestal 27 is provided with an inner diameter measuring sensor device 28. Each inner diameter measuring sensor device 28 is used as a first measuring sensor for measuring the vertical position of a device body 29 mounted on the lifting pedestal 27. A linear scale 30;
A lance 31 to be inserted into the tube, a sensor portion 32 attached to the tip of the lance 31 and capable of abutting against the inner surface of the tube, and a lance base 3 which supports the lance 31 and is provided on the apparatus main body 29 so as to be able to move up and down.
1a, a spring 33 as an elastic body that urges the lance pedestal 31a outward in the tube radial direction and presses the initial position.
A laser displacement meter 34 as a second measurement sensor for measuring the vertical distance from the reference position in the device main body 29 to the sensor unit 32, and the sensor unit 32 is arranged toward the tube axis direction. It has a rod-shaped main probe 35 and a needle-shaped sub-probe 36 arranged vertically.

The face plate 17 is provided with a master piece device 37 for calibrating the measurement accuracy of the inner diameter measurement sensor device 28. The master piece device 37 extends over an accuracy check position facing the sensor section 32 and a retreat position. It has a master piece 38 that moves in and out, an air cylinder 39 that drives the master piece 38, and a pair of sensors 40 that detect the movement of the master piece 38. An air purge device (not shown) for cleaning the master piece 38 is provided near the master piece device 37.

The operation of each of the above-mentioned devices is controlled by a control device (not shown), and the operation thereof will be described below. The control device performs an accuracy check operation prior to a normal measurement operation. At the time of accuracy confirmation, the control device drives each servomotor 25 of each elevating pedestal device 24 so that each lance 31 and sensor portion 32 of each inner diameter measuring sensor device 28 can be inserted into the master piece 38, and Each lance 31 and the sensor unit 3 of the detection sensor device 28
The height of the elevating pedestal 27 is adjusted so that the two are located close to each other on the center side of the master piece.

In the procedure shown in FIGS. 5 and 6, the control device cleans the master piece 38 by air purging (S
t. 1) Drive each servo motor 25 of each elevating pedestal device 24 (St. 2) (St. 3), and each inner diameter measuring sensor device 2
The height of the elevating pedestal 27 is adjusted so that each of the lances 31 and the sensor unit 32 of FIG. 8 can be inserted into the master piece 38 (St. 4) (St. 5).

Next, the master piece device 37 is driven (St. 6), and the master piece 38 is arranged at the accuracy confirmation position (St. 7). Both lances 31 are master pieces 3
8, the servomotors 25 of the respective lifting pedestal devices 24 are driven to drive the respective inner diameter measuring sensor devices 2.
8 is vertically separated, and the sensor part 32 of each lance 31 is pressed against the inner surface of the pipe (St. 8) (St. 9).

When each inner diameter measuring sensor device 28 moves with the sensor portion 32 abutting on the inner surface of the master piece 38, each lance base 31a moves from the initial position against the urging force of the spring 33, and The sensor unit 32 relatively moves from the reference position of the apparatus main body 29. As a result, this movement causes the lance 31 to move in the direction opposite to the direction in which the apparatus main body 29 moves.

When the movement of the lance 31 and the sensor section 32 is detected by the laser displacement meter 34, the lifting pedestal devices 24 are stopped (St. 10) (St. 11). Each linear scale 30 measures the moving distance of the apparatus main body 29, and each laser displacement meter 34 measures the moving distance of the lance 31 and the sensor unit 32 from the reference position.
The measured value of 0 is added, and the operation of subtracting the measured value of each laser displacement meter 34 is performed to obtain the inner diameter of the master piece 38 (St. 12).

After the measurement, each of the elevating pedestal devices 24 is driven (St. 13) (St. 14), and the sensor section 32 is separated from the inner peripheral surface of the master piece 38 (St. 15) (St. 1).
6) By repeating the same procedure as described above, the sensor 32 is brought into contact with the inner peripheral surface of the tube, and the inner diameter is measured a set number of times (S
t. 17).

The measured values of the master piece 38 are sent to the control device a plurality of times, and the accuracy of the internal diameter measurement sensor device 38 is confirmed by comparing the measured value with the reference internal diameter of the master piece 38 previously input to the control device. If the accuracy is abnormal, a warning is issued to notify the worker.

After confirming the accuracy, the master piece device 37 is driven (St. 18), the master piece 38 is arranged at the retracted position (St. 19), and each lifting pedestal device 24 is driven (St. 20) (St. 20). 21), the sensor unit 32 is returned to the normal setup position (St. 22) (St. 23).

At the time of measurement, the control device performs setup change based on various data such as the diameter of the pipe 12 to be inspected and the servo motors 25 of the lifting pedestal devices 24.
So that the lances 31 and the sensor portions 32 of the inner diameter measurement sensor devices 28 can be inserted into the inspection target tube 12, and the lances 31 and the sensor portions 32 of the inner diameter detection sensor devices 28 The height of the elevating pedestal 27 is adjusted so as to be located close to each other on the side.

The measurement is performed according to the procedure shown in FIGS. First, the tube pressing cylinder 14 is driven to fix and hold the inspection object tube 12 in the axial direction (St.
1) The face plate cylinder 18 is driven to bring the face plate 17 into contact with the end face of the pipe (St. 2), and the position of the face plate 17 is measured by a face plate linear sensor (not shown) to determine the reference of the face plate. The moving distance B from the position is obtained (St. 3). At the same time, face cylinder 18
Is driven (St. 4), and the face plate 17 is moved backward to return to the reference position (St. 5).

Next, from the reference position of the traveling vehicle 22,
7 is added to the predetermined distance A to the reference position, the predetermined distance C from the pipe end face to the measuring point for each pipe type, and the moving distance B described above (St. 6), and the obtained value is traveled. The travel distance of the carriage 22 is set (St. 7), and the servo motor 20 of the traveling carriage device 19 is driven to drive the traveling carriage 22 toward the inspection target pipe 12 (St. 8).
The two lances 31 are inserted into the tube 12 to be inspected through the opening 17a, and the sensor 32 is positioned at the measurement point (St. 9).

With the sensor portion 32 provided at the tip of the lance 31 positioned at a predetermined point, the servomotor 25 of each lifting pedestal device 24 is driven to separate the two inner diameter measuring sensor devices 28 up and down ( St. 10) (St. 11), the sensor part 32 of each lance 31 is pressed against the inner surface of the pipe.

When each inner diameter measuring sensor device 28 moves with the sensor portion 32 in contact with the inner surface of the tube, each lance base 3
1a moves from the initial position against the urging force of the spring 33,
The lance 31 and the sensor unit 32 relatively move from the reference position of the apparatus main body 29. As a result, this movement causes the lance 31 to move in the direction opposite to the direction in which the apparatus main body 29 moves.

When the movement of the lance 31 and the sensor section 32 is detected by the laser displacement meter 34, the lifting pedestal devices 24 are stopped (St. 12) (St. 13). Each linear scale 30 measures the moving distance of the apparatus main body 29, and each laser displacement meter 34 measures the moving distance of the lance 31 and the sensor unit 32 from the reference position.
The measured value of 0 is added, and the operation of subtracting the measured value of each laser displacement meter 34 is performed to obtain the inner diameter of the tube (St. 14). After the measurement, each lifting pedestal device 24 is driven (St. 15) (S.
t. 16) In a state where the sensor unit 32 is separated from the inner peripheral surface of the inspection target tube 12 (St. 17) and (St. 18), the tube rotation support device 11 is driven to rotate the inspection target tube 12 by a predetermined angle. And the sensor unit 3 is operated in the same manner at each rotational position.
2 is brought into contact with the inner peripheral surface of the pipe to measure the inner diameter (St. 1).
9).

The measured values of the inner diameters at a plurality of points are sent to the control device, and the pass / fail of the inner diameter of the pipe to be inspected is determined by comparing the measured values with the specified inner diameters previously input to the control device. Normally, the sensor section 32 uses the main probe 35, and the main probe 35 has a rod shape extending in the axial direction. Therefore, even if the positioning accuracy in the tube axis direction is not high, the main probe 35 can be easily located at the measurement location. The main probe 35 can be easily measured even in a small-diameter tube.
Can be inserted and measured.

As shown in FIG. 3, when the measurement location is a groove formed on the inner surface of the tube, the sub-probe 36 is used.
By making the sub-probe 36 needle-shaped, it can be accurately brought into contact with the measurement location.

When the measurement is completed, the traveling bogie device 19
Is driven (St. 20), and the traveling carriage 22 is moved backward (St. 20).
21) At the same time, the tube pressing cylinder 14 is raised (St. 2).
2) Return to the standby position (St. 23).

[0035]

As described above, according to the present invention, it is possible to easily check the accuracy by measuring the master piece supplied by the master piece device and confirming that the sensor output value for the master piece corresponds to the reference inner diameter. You. In addition, since the sensor unit is pressed against the master piece by a mechanical operation without manual intervention, the pressing force can be kept constant and the measurement accuracy can be stabilized and automated.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an inner diameter inspection device according to an embodiment of the present invention.

FIG. 2 is a front view showing the same panel device.

FIG. 3 is an enlarged view showing the inner diameter measuring sensor device.

FIG. 4 is an enlarged view showing an accuracy check state of the inner diameter measurement sensor device.

FIG. 5 is a flowchart showing the procedure of the accuracy check.

FIG. 6 is a flowchart showing the procedure of the accuracy check.

FIG. 7 is a flowchart showing the procedure of the measurement.

FIG. 8 is a flowchart showing the procedure of the measurement.

FIG. 9 is a schematic diagram showing a conventional inner diameter inspection apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pipe rotation support device 12 Pipe to be inspected 14 Pipe pressing cylinder 16 Face plate device 19 Traveling trolley device 22 Traveling trolley 24 Elevating pedestal device 27 Elevating pedestal 28 Inner diameter measuring sensor device 29 Device main body 30 Linear scale 31 Lance 32 Sensor part 33 Spring 34 Laser displacement gauge 35 Primary probe 36 Secondary probe 37 Masterpiece device 38 Masterpiece

Claims (1)

[Claims] 1. A traveling trolley device that reciprocates along the axial direction of a pipe to be inspected, a pair of elevating pedestal devices vertically approaching and separating on the traveling trolley device, and an inner diameter provided on the elevating pedestal of each elevating pedestal device. A measuring sensor device; and a control device for controlling each drive of the traveling trolley device and the elevating pedestal device. Each inner diameter measuring sensor device is a first measuring sensor for measuring a vertical position of the device main body, and is inserted into a pipe. Lance to
A sensor unit that can be attached to the tip of the lance and can contact the inner surface of the tube, a lance pedestal that supports the lance and that can be raised and lowered on the apparatus main body, and urges the lance pedestal outward in the tube radial direction. In a contact-type pipe inner diameter measuring device having an elastic body pressing to a position and a second measuring sensor for measuring a vertical distance from a reference position in the device body to a sensor portion, a reference inner diameter dimension is provided in front of the traveling bogie device. A master piece device is provided with a master piece device that moves out of the master piece provided with an accuracy check position facing the inner diameter measurement sensor device and a retract position, and the control device measures the inner diameter of the master piece prior to the operation of measuring the inner diameter of the pipe to be inspected. An accuracy checking device for a contact-type pipe inner diameter measuring device, characterized by having a functional circuit for performing an operation.