JP2001264197A - Device for information display and function setting of ultrasonic bolt axial force measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent mismeasurement by adjusting measurement peaks before and after clamping to have the same waveform part if a position shift is caused, to widen the selection of waveforms used for the measurement, to facilitate their switching, and to eliminate the trouble to switch pictures at the time of bolt size setting. SOLUTION: This device is applied to an ultrasonic bolt axial force measuring instrument which measures the axial force of a bolt from the relation between reflection times obtained in initial value setting mode and axial force measurement mode is composed of a means which obtains and stores the waveform and measurement point of a reflected echo by measurement in the initial value setting mode as well as the measurement of the reflection times, a means which obtains the waveform and measurement point of the reflected echo by measurement in the axial force measurement mode as well as the measurement of the reflection time, and a means which displays the waveform and measurement point of the reflected echo in the axial force measurement mode in the same area on the screen of a display part 21 and also displays the waveform and measurement point of the reflected echo in the initial value setting mode over them selectively at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable ultrasonic bolt axial force measuring device for measuring the axial force of a bolt. Device.

[0002]

2. Description of the Related Art An ultrasonic bolt axial force measuring device is known as a device for measuring the axial force of a bolt using ultrasonic waves. In this device, for example, with respect to a bolt and a nut used as a connecting means of any two members, the nut is fitted into a screw inserted into a hole formed in the specific member, and the nut is rotated to rotate the specific member. Is used to measure the axial force of the bolt. According to this device, an ultrasonic probe (probe) is arranged on the head of a bolt, and an ultrasonic beam is incident on the bolt before and after tightening, thereby transmitting ultrasonic waves inside the bolt. The probe is configured to receive the reflected echo at the opposite end of the bolt again by the probe. According to the ultrasonic bolt axial force measuring device, the time when the ultrasonic wave propagates inside the bolt is measured based on the reflected echo, and the beam path of the ultrasonic wave is obtained. Since the bolt is stretched by the tightening axial force after the tightening as compared to before the tightening, the sound speed of the ultrasonic wave propagating inside becomes slow and the propagation time is different. By calculating the amount of change (difference) in the propagation time measured before and after tightening as described above, the amount of change has a good correlation with the tightening axial force applied to the bolt. It becomes possible to measure the tightening axial force of the bolt.

[0003] Examples of the measurement of the axial force of a bolt include:
For example, when fixing equipment at a nuclear power plant,
Measure the bolt axial force as an initial state before tightening the large bolt used for it at the stage of delivery, and measure the bolt axial force after tightening in a state where it is used as a coupling means for fixing equipment in the power plant. There is an example to measure. In some cases, the bolt axial force is managed over time. In such a case, the time interval from the measurement of the axial force in the first tightened state to the measurement of the axial force in the second tightened state becomes considerably long.

[0004]

In the above-mentioned ultrasonic bolt axial force measuring apparatus, it is necessary to accurately specify the maximum peak point of the reflected echo waveform in order to accurately measure the axial force. However, in the actual work, the waveform of the actual reflected echo changes between the initial state of the bolt before tightening and the state after tightening, and it has been difficult to measure accurately.

A specific description will be given with reference to waveforms. As shown in FIG. 15, when a transmission wave (T) 1001 is given from a probe to a volt, a reflected echo (F) 1002
Is received by the probe. When the reflection echo 1002 is shown in an enlarged manner, as shown in FIG. 16, the reflection echo is formed from a plurality of waveforms 1003 having peaks. Looking at the measurement of the bolt axial force described above with respect to the reflected echo 1002 from the viewpoint of the waveform 1003, this axial force measurement shows a waveform 10
The maximum peak at 03 is detected. In the ultrasonic bolt axial force measuring device, the waveform to be measured is always constant,
If the maximum peak of the same waveform portion can be detected, measurement can be performed with high accuracy, and there is no problem. However, as shown in FIG. 17, usually, before tightening (A)
After tightening (B), the waveform changes, resulting in a waveform 10
The maximum peak points 1004 and 1005 at 03 differ, which reduces the accuracy of the measurement.

As a prior art for solving the problem of a decrease in accuracy in measuring the axial force of an ultrasonic bolt, for example, Japanese Unexamined Patent Publication No.
There is an ultrasonic bolt axial force measurement device disclosed in No. 29329. According to this measuring device, a threshold is set in advance for the received reflected echo, and a gate for selecting the waveform portion of the first peak exceeding the threshold is provided, and the first peak point of the waveform is always provided. Is a target point of measurement. However, even with this method, the shape of the ball and the waveform after tightening change, and if the waveform portion of the first peak becomes smaller than the threshold level, it becomes impossible to detect the first peak point. . In such a case, the above-described threshold level, gain, and the like must be adjusted, and the configuration is low in practicability. In addition, when managing the bolt axial force over time, the time interval between measurements becomes very long as described above, or the operator who performs the measurement may be different, so the measurement used in the initial measurement It is difficult to memorize the target peak point, so that the measurement is performed in a state where the peak point is shifted, which causes an erroneous measurement. Therefore, it is desired to solve the above problems and propose a practical ultrasonic bolt axial force measuring device (first problem).

Further, in the ultrasonic bolt axial force measuring device disclosed in the above document, various software for realizing a threshold function, a gate function, a waveform selecting function, and a peak detecting function in order to solve the above problems. It is necessary to have. In addition, since the measuring apparatus generally has input functions such as waveform display processing and switches in addition to the software, the above-described functions are entangled to form a very complicated program. Therefore, there has been a problem that a program error and a data processing procedure error are likely to occur, causing an unexpected malfunction or a measurement error at a measurement point. In addition, if the waveform of the reflected echo measured after tightening is not the one shown in FIG. 17B but collapses as shown in FIG. Was difficult to measure. Therefore, in the ultrasonic bolt axial force measuring device, the entire program for operating the ultrasonic bolt axial force measuring device is simplified, a malfunction does not occur, a configuration with good operability is desired, and the ultrasonic bolt axial force measuring device is obtained before and after tightening. There is a demand for a configuration that can accurately obtain the same maximum peak in a given waveform (second problem).

Further, in the ultrasonic bolt axial force measuring apparatus, generally, when setting the dimensions of the bolt to be measured, the bolt dimensions are set based on the information displayed on the screen of the display device. At this time, on the display screen, a screen for setting dimensions and a screen on which a bolt figure is drawn are provided as separate screens. Therefore, according to the conventional measuring device, when setting the dimensions of the bolt, in order to confirm the setting position of the dimension while setting the dimensions of the bolt, the dimension setting screen and the bolt figure screen are operated by a specific operation. I had to switch. Therefore, the work of dimension setting is troublesome, and there is a possibility that the dimension setting is incorrect (third problem).

A first object of the present invention is to solve the above-mentioned first problem, and a position shift has occurred such that a measured peak before tightening and a measured peak after tightening have the same waveform portion. An object of the present invention is to provide an information display device (waveform superimposed display device) in an ultrasonic bolt axial force measurement device capable of performing adjustment and preventing erroneous measurement.

A second object of the present invention is to solve the above second problem, and it is possible to easily select the peak point used in the measurement in the initial state before tightening even in the measurement after tightening. It is an object of the present invention to provide an information display device (waveform switching device) in an ultrasonic bolt axial force measuring device capable of expanding the selection of waveforms used for measurement and easily switching the waveforms, and having improved operability. .

A third object of the present invention is to solve the above third problem, and to display a bolt figure and a dimension setting menu on the same display screen to reduce the trouble of switching the screen. It is an object of the present invention to provide a function setting device (bolt dimension setting device) in an ultrasonic bolt axial force measuring device which solves the problem and prevents erroneous setting.

[0012]

An apparatus for displaying information and setting functions in an ultrasonic bolt axial force measuring apparatus according to the present invention is configured as follows. More specifically, the information display and function setting device is a waveform superposition display device, a waveform switching device, or a bolt size setting device.

In the ultrasonic bolt axial force measuring device according to the present invention, the waveform superimposing display device (corresponding to claim 1) is:
It has an ultrasonic measuring unit that applies an ultrasonic wave to the bolt and receives a reflected echo thereof, and measures the bolt with ultrasonic waves propagating in the bolt, and an initial value setting mode in a no-load state using the ultrasonic measuring unit. It is applied to the ultrasonic bolt axial force measuring device that measures the reflection time of the ultrasonic wave at the bolt in the axial force measurement mode in the load state, and measures the axial force of the bolt from the relationship between the reflection time in the two modes. In the measurement in the value setting mode, together with the measurement of the reflection time, the means of acquiring and storing the waveform of the reflected echo and the measurement point, and in the measurement in the axial force measurement mode, together with the measurement of the reflection time, Means for acquiring the reflected echo waveform and the measurement point, and displaying the reflected echo waveform and the measurement point in the axial force measurement mode in the same region of the display screen, and selectively and simultaneously in the initial value setting mode. Reflection echo waveforms and measurement points It is characterized by being configured with means for displaying superposed.

A waveform switching device (corresponding to claim 2) in the ultrasonic bolt axial force measuring device according to the present invention is applied to the above-described ultrasonic bolt axial force measuring device, and receives a reflected echo waveform. Waveform operation circuit that creates full-wave, positive-half-wave, negative-half-wave, and RF-wave waveforms based on the waveform of reflected echo used for measurement in measurement in the initial value setting mode and axial force measurement mode Is selected from any of a full-wave waveform, a positive half-wave waveform, a negative half-wave waveform, and an RF wave waveform.

A bolt size setting device (corresponding to claim 3) in the ultrasonic bolt axial force measuring device according to the present invention is applied to the above-described ultrasonic bolt axial force device, and is displayed on the same screen of the display unit. Means for simultaneously displaying the bolt figure display area, the dimension setting display area, and the comment display area; and between the display contents of the bolt figure display area, the display contents of the dimension setting display area, and the display contents of the comment display area, Means for providing a relationship based on the correspondence.

[0016]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First, an overall configuration of an ultrasonic bolt axial force measuring device to which the present invention is applied (hereinafter abbreviated as "axial force measuring device") will be outlined. This axial force measuring device is preferably a portable device, and is used by an operator carrying it at a measurement site. This axial force measuring device usually includes an apparatus main body for performing axial force measurement using ultrasonic waves, and a carrier support housing for mounting the apparatus main body. The axial force measurement of bolts based on ultrasonic waves is basically the same as ordinary ultrasonic flaw detection,
This is performed using an ultrasonic measurement unit.

FIG. 2 shows a front portion of the apparatus main body 11. A display unit 21 made of, for example, liquid crystal is provided on a front portion of the apparatus main body 11.
Is provided. For example, a TFT is used as the liquid crystal of the display unit (liquid crystal display unit) 21, and is preferably formed in a horizontally long shape, and is formed as a large screen of color display. The display unit 21 displays an echo waveform obtained by the measurement, various information, setting / operation information, and the like. Around the display unit 21, various operation keys 22, a power switch 23, a buzzer 24, an LED 25, an input terminal 26, an output terminal 27, and the like used for measurement are provided. At the upper part of the apparatus main body 11, a hooking part 28 for attaching a portable band is provided on both sides.
It is provided in the place. In FIG. 2, among the plurality of operation keys 22, the f1 function key 22a, the clear key (CLR) 22b, and the
Set key (SET) 22c, 4 movement keys 22
d, the temperature input key is 22e, and the freeze key is 22f, and different reference numerals are given. A main board is built in the apparatus main body 11 described above, and on this main board, an electric circuit unit for performing various control processing and signal processing for the purpose of performing ultrasonic bolt axial force measurement and the like is provided. I have.

FIG. 1 shows a system configuration of the electric circuit unit 30. The electric circuit unit 30 includes an MPU 31 that controls transmission and reception of ultrasonic waves, calculates and processes measurement data, controls display contents of the liquid crystal display unit 21, and the like. An input / output control circuit 32 is provided between the MPU 31 and the input unit and the output unit. The input / output control circuit 32 includes an MPU
The input unit or the output unit is controlled in response to the instruction 31. The input unit includes a key switch 33. The key switch 33 is used for the various operation keys 22, 22a to 22 described above.
In correspondence with f, a plurality of key switches are actually provided. The output unit includes, for example, the pulsar 34, the receiver 35, and the LED 25 and the buzzer 24 described above.

The ultrasonic wave output signal output from the input / output control circuit 32 is supplied to a pulser 34, and the pulser 34 outputs a pulse signal to a probe 36. The probe 36 includes a piezoelectric element, and converts a pulse signal into an ultrasonic wave 37 by a piezoelectric conversion operation. The probe 36 is arranged so as to be in contact with the head of a bolt 38 as a subject. The ultrasonic waves 37 emitted from the probe 36 to the bolt 38 travel toward the tip of the bolt 38. At the tip of the bolt 38, an ultrasonic reflected wave, that is, a reflected echo is generated, and returns to the probe 36. The reflected echo is converted into an electric echo signal by the probe 36. This echo signal is supplied to the receiver 35. The receiver 35 receives a control signal from the input / output control circuit 32 and sets a gain (amplification factor) and the like. The echo signal (waveform signal) extracted by the receiver 35 is converted from an analog signal to a digital signal by the A / D converter 39 and stored in the waveform memory 40.

Various operation signals input through a plurality of key switches 33 in response to operation of the operation keys are input to an input / output control circuit 32. Various commands related to measurement are given to the MPU 31 via the input control circuit 32 by ON / OFF operations of various key switches 33. The instruction contents by the plurality of key switches 33 include, for example, gain setting, pulse and gate positions, gate width, waveform enlargement, peak holding, and change of screen display contents of the display unit 21. Further, the input / output control circuit 32 drives the LED 25 and the buzzer 24 to provide a necessary message to the measurement operator.

MPU 3 for calculating and processing measured data
1, the timing memory 41, the ROM 42, the RAM 43, and the display controller 44 are connected via a bus 45. RA
M43 is provided with a battery 46, and is backed up by the battery 46 so that internal data is not lost even when the main power is turned off. The timing circuit 41 adjusts the timing of the output operation of the pulser 34, the conversion operation of the A / D converter 39, and the storage operation of the waveform memory 40. ROM4
2 stores programs for forming various functional units in the MPU 31. In this embodiment,
A program 42 for forming an initial setting unit in the ROM 42
a, a program 42b for forming a waveform display section, a program 42c for forming a menu display section, a program 42d for forming a parameter setting section, a program 42e for forming an arithmetic section, and a program 42 for forming a peripheral device control section
f, a waveform switching program 42g, a waveform superposition display program 42h, a bolt dimension setting program 42i, and the like are stored. Naturally ROM42
Has a data storage area for storing various data.
The MPU 31 reads out a program stored in the ROM 42 and implements necessary functional units. The MPU 31 executes, for example, the program 42b to form a waveform display section on the display section 21 and executes the program 42e to execute the waveform memory 4
The measured waveform data stored in “0” is processed to create an image signal, a control signal, and the like, and is sent to the display controller 44 while temporarily storing the data in the RAM 43. The display controller 44 controls the image content of the display 21 based on an image signal or the like, that is, a signal for displaying an image. In the present invention, as described below, the waveform switching program 42
g, a waveform superimposition display program 42h, and a function realized by each of the bolt size setting programs 42i.

When a flash memory is used as the ROM 42, which is an element whose data does not disappear even when the power is turned off, the ROM 43 is used instead of the RAM 43.
42 can be used.

Next, an embodiment of the waveform superimposing display device in the ultrasonic bolt axial force measuring device according to the present invention will be described with reference to FIGS. 1 and 2 described above and FIGS. I do.

In the display of the waveform superposition of the axial force measuring device according to the present embodiment, the MPU 31
42h, a waveform superimposition display program stored in 42
, The initial setting unit program 42a, the parameter setting unit program 42d, and the like are called and executed. The overall operation flow of the waveform superimposition display program 42h is as shown in the flowchart of FIG. The description of the waveform superimposed display according to the present embodiment will be made according to the flowchart shown in FIG. In the waveform display according to this embodiment, the measurement of the axial force of the bolt 38 is performed before the bolt is tightened (initial value setting mode: no load state) and after the bolt is tightened (the axial force measurement mode: load state). The ultrasonic wave 37 is propagated inside the bolt using the probe 36, and data such as the reflection time and waveform of the ultrasonic wave and the measurement points are acquired. The data measured in the initial setting mode is stored in the RAM 43 shown in FIG. 1 in a nonvolatile state. The above-described measurement using ultrasonic waves is performed by an ultrasonic measurement function unit configured by the electric circuit unit 30. The time interval between the initial value setting mode and the axial force measurement mode is arbitrary, and a long time may elapse between them.

The operation of the waveform superimposed display will be described with reference to the flowchart shown in FIG. In the first step S11, ultrasonic measurement is performed in the initial value setting mode. The state of the ultrasonic measurement is as shown in FIG. The probe 36 is used in a state where it is arranged on the head of a bolt 38. Data such as a waveform obtained by the ultrasonic measurement in the initial value setting mode is stored in the RAM 43.

In the next step S12, the axial force measurement mode is started. In this axial force measurement mode, it is possible to superimpose and display the waveform stored by the ultrasonic measurement in the initial value setting mode performed previously on the screen of the display unit 21. However, this superimposed display is selected according to the intention of the person performing the measurement. That is, the next step S1
As shown in FIG. 3, the measurement operator can select the display instruction of the waveform superimposition by using the waveform superimposition switching menu.

More specifically, when the axial force measurement mode is activated, a display as shown in FIG. 3 is normally displayed on the screen 21a of the display unit 21. On screen 21a,
An area 51 where a waveform is displayed and a parameter setting area 52 are displayed. The parameter setting area 52 can be displayed by pressing one of the function keys in FIG. For example, when a key for setting the waveform superimposition display is assigned to the key 22a, when the key 22a is pressed, a waveform superimposition setting item 53 is displayed in the parameter setting area 52. O in the waveform superimposition setting item 53
N54 and OFF55 items (selection switches) are shown. Reference numeral 56 denotes a cursor for selecting an item. By moving the cursor 56 up and down and selecting the ON or OFF item, it can be determined whether or not to perform the waveform superimposed display. The cursor 56 is moved using the arrow keys 22d shown in FIG. When the cursor is moved to ON56 and the set key 22c is pressed, the waveform superimposed display is enabled. The above-described series of operations can be seen from the flowchart shown in FIG.
And subsequent steps S14, S15 or step S1
6 will be executed.

In FIG. 3, an area 51 where a waveform is displayed
When the superimposed display of the waveforms is instructed, the waveform 57 and the measurement points (points indicating the peaks used for the measurement) 58 stored by the ultrasonic measurement in the initial value setting mode are shown in the figure. Waveform 59 during measurement in axial force measurement mode
And the measurement point 60 are superimposed and displayed. In the display in FIG. 3, the waveform 57 in the initial value setting mode is indicated by a broken line, and the waveform 59 in the axial force measurement mode is indicated by a thick solid line. The horizontal solid line 61 shown in the area 51 represents the threshold. The above operation is executed in step S15 of the flowchart.

On the other hand, when the item of OFF 55 is selected by the cursor 56 in the judgment step S14, a step S16 is executed. According to step S16, only the waveform 59 and the measurement point 60 in the axial force measurement mode are displayed. The feature of the present embodiment is that the ultrasonic bolt axial force measuring apparatus can superimpose and display the waveforms in the axial force measuring mode, and the flowchart is composed of steps S13, S14, S
15 is included.

In the area 51 for displaying the waveform shown in FIG. 3, the waveform 57 in the initial value setting mode and its measurement point 5
8 were clarified, and these were compared with the waveform 5 in the axial force measurement mode.
By comparing with 9 and its measurement point 60, the measurement operator can easily confirm the coincidence or difference between them.

In the above description, when the overlap display of the waveforms is performed in the area 51, the area 52 for selecting an item is set so as to disappear from the screen 21a.

In step S17, an ultrasonic measurement is performed in the axial force measurement mode, and as a result, the obtained axial force value, waveform, and the like are displayed on the screen 21a. When the waveform display area 51 of the screen 21a displays the waveforms and the measurement points of the two modes under the selection of the waveform superimposed display, the measurement points of the waveform obtained in the axial force measurement mode are initialized. If the measurement points of the waveform obtained in the mode are different,
Since a shift has occurred, it is necessary to perform adjustment so that the waveform measurement points in the two modes match.
The presence or absence of the shift is determined by the operator performing the measurement. FIG.
The part A in the flowchart shown in FIG. 7 is a part related to the judgment / action of the worker. In the step expressed as the determination step S18, the presence or absence of occurrence of a shift of the measurement point is determined by the operator viewing the content displayed on the screen 21a. If there is no shift between the waveform measurement point 58 in the initial value setting mode and the waveform measurement point 60 in the axial force measurement mode with respect to the peak to be measured, that is, if they match, accurate Assuming that the bolt axial force has been measured, the operation of measuring the ultrasonic bolt axial force ends. If the above deviation occurs, that is, if the waveform measurement points of the two are different, the operator adjusts the threshold and gain, etc., assuming that the measured bolt axial force value is incorrect. Then (step S19), the flow returns to step S17, and the ultrasonic measurement of the axial force is performed.
Thereafter, steps S18 and S19 described above are performed.

FIG. 5 shows an actual screen example of the bolt axial force measurement of the ultrasonic bolt axial force measuring device according to the present embodiment. FIG.
As is apparent from FIG. 7, when actually measuring the bolt axial force, an area 51 for displaying the bolt measurement waveform is formed in the lower half of the screen 21a, and the bolt axial force is within the allowable range on the upper side thereof. Graph 62 indicating whether there is
Is displayed. Bar 63 of the graph between Fmin and Fmax
Is present within an acceptable range.
Then, the axial force value of the bolt is numerically displayed in the vertical column 64 on the right side of the screen 21a.

FIGS. 6 to 8 show some typical display patterns on the menu screen. In these figures, a hatched line 65 indicates the position of the cursor. The cursor can be freely moved up and down, thereby selecting and executing. In measuring the axial force of the bolt, FIG.
By selecting the pre-tightening measurement (bolt initial state) and the axial force measurement (after bolt tightening) in menu 2 shown in FIG. 5, a screen for measuring the axial force of the bolt, that is, a screen 21a shown in FIG. This can be displayed on the screen of the display unit 21 described above.

According to the waveform superimposed display in the ultrasonic bolt axial force measuring apparatus according to the present embodiment, the waveform and the measurement point when the initial value is set and the waveform and the measurement point when the axial force is measured are in the same area of the display screen. Since the display is configured to be superimposed and displayed at the same time, a shift of a measurement position (measurement point) caused by a change in the waveform shape of the reflected echo can be visually confirmed by an operator on the spot, and thus an error can be confirmed. Measurement and measurement with low accuracy can be prevented. In addition, since the overlapping display of the waveforms can be selectively performed on the flowchart, the measurement operator can perform the overlapping display of the waveforms as necessary, and when unnecessary, the conventional bolt axial force can be used. Has the advantage that it can be measured.

Next, a second embodiment of the present invention will be described with reference to FIGS.
2 and the above-described FIGS. This embodiment relates to a device capable of switching waveforms in an ultrasonic bolt axial force measuring device.

The waveform switching according to the present embodiment is performed by executing a waveform switching program 42g and a basic program related thereto. The block configuration of the circuit shown in FIG. 10 is the same as that of the receiver 3 in the electric circuit diagram 30 shown in FIG.
5 shows the internal configuration. In the receiver 35, reception of a signal corresponding to the reflected echo, waveform shaping, and A / D converter 3
9 is transmitted. The flow of signal processing in the receiver 35 will be described in more detail with reference to FIG.
The signal a received by the receiver 35 is input to the receiving circuit 71. The receiving circuit 71 amplifies the received signal a and increases it to a level at which subsequent processing becomes possible. Receiving circuit 7
The amplification factor at 1 is indicated by the input signal b. Signal b for designating the amplification factor is provided from input / output control circuit 32. The output signal s1 from the receiving circuit 71 is
2 is input. The output signal s1 of the receiving circuit 71 is a signal representing an RF wave. In the separation circuit 72, the signal s1
Is divided into a positive side (positive half wave) signal s2 swinging upward and a negative side (negative half wave) signal s3 swinging downward. The respective signals s1 and s2 are separately output from the separation circuit 72.
The signal s2 is input to the adding circuit 73, and the signal s3 is input to the inverting circuit 74. The inversion circuit 74 inverts the signal s3 from the negative side to the positive side and outputs the inverted signal. The output signal of the inversion circuit 74 is s4. The output signal s4 of the inverting circuit 74 is input to the adding circuit 73. The addition circuit 73 adds the signal s2 and the signal s4, and as a result, outputs a composite signal s5. The signal s5 is called a full-wave signal. As described above, the signals s1 to s5 generated by each unit in the receiver 35 are shown in FIGS. 11A to 11E, respectively. Receiver 3
At the last stage of 5, a switching circuit 75 is provided. The switching circuit 75 includes the signals s1, s2,
s4 and s5 are input. The switching circuit 75 selects one of the signals s1, s2, s4, and s5 based on the switching command signal c and outputs the selected signal as an output signal d.

According to the configuration of the receiver 35 of this embodiment, only the full-wave signal s5 is conventionally used,
The switching circuit 75 selects and switches the RF signal s1, the positive half-wave signal s2, the negative half-wave signal s4, and the full-wave signal s5, and outputs only one designated waveform as an output signal d.
/ D converter 39. This generally means that when an axial force is applied to the bolt, the magnitude of the positive half-wave and the negative half-wave are often reversed, so that the peak point tends to shift, and even in such a case, A circuit configuration that can use any of the positive and negative peak points is employed.

Next, a method of operating the circuit switching will be described.
For example, by pressing any function key,
As shown in FIG. 12, an area 76 for parameter setting is displayed on the screen 21a. In the area 76, waveform setting items 77 to 80 for selecting a waveform to be used are displayed. Therefore, by moving the cursor 56, the RF wave (signal s1) 80 and the positive half wave (signal s2) 7
8, any one of the negative half wave (signal s4) 79 and the full wave (signal s5) 77 can be selected in a timely manner. Eventually, the cursor 56 is set at the position of the waveform to be used and the set key 22c is pressed to determine the waveform. When the determination is completed, the waveform selection items 77 to 80 disappear from the screen.

In the display example of FIG. 12, the setting item 7 of the negative half wave is set.
9 is selected, and the waveform 81 corresponding to the negative half-wave is displayed in the waveform display area 51 in a state where it is repeated on the positive side.

The above-described waveform switching may be configured as follows. The type of the waveform selected in the initial value setting mode may be temporarily stored in the RAM 43, and the previously selected waveform type may be automatically set in the subsequent axial force measurement mode.

According to the above-described second embodiment of the present invention, in the ultrasonic bolt axial force measuring device, the type of the waveform of the reflected echo to be measured can be a full wave, a positive half wave, a negative half wave, or an RF wave. Since it is possible to select either one, the peak point measured in the initial value setting and the peak point used in the axial force measurement can be the same peak part of the same waveform, reducing erroneous measurement it can.

Next, a third embodiment of the present invention will be described with reference to FIGS.
4 and FIGS. 1, 2, 6 to 9 described above. This embodiment relates to an apparatus for setting a dimension of a bolt in an ultrasonic bolt axial force measuring apparatus. The bolt size setting device according to the present embodiment is realized by calling and executing the bolt size setting program 42i shown in FIG. On the screen 21a of the display unit 21, first, the menus shown in FIGS. The display necessary for the operation of the axial force measurement is performed by appropriately selecting the menu switching item.
In this embodiment, the item 91 of the bolt dimension setting in the display pattern of the menu 1 shown in FIG. 6 is used. That is, when inputting the dimensions of the bolt, when the condition setting I of the menu 1 in FIG. 6 is selected, a screen as shown in FIG. 9 is displayed. When a bolt type 92 is selected on the screen of FIG. 9 and an item 91 of bolt dimension setting is selected, a bolt dimension setting screen 93 shown in FIG. 13 is displayed.

A bolt size setting screen 93 shown in FIG.
Then, an area 10 for displaying a bolt figure on one screen
1, a dimension setting menu 102, and a column 103 for displaying comments. A cursor is displayed on the bolt size setting menu 102, and the size can be selected and set by moving the cursor.
When the cursor is moved on the dimension setting menu 102, the color of the symbol of the corresponding part in the bolt figure changes. Furthermore, since the comment corresponding to the position of the cursor is displayed in the comment display column, the setting location of the bolt dimension can be visually and easily determined by the operator.

FIG. 14 shows the contents of the bolt size setting program.
A detailed description will be given according to the flowchart shown in FIG. In the first step S21, a dimension setting menu 102 is displayed. The contents of the dimension setting menu are as shown in FIG. 13 as described above. In the dimension setting menu 102, the bolt figure 94 is displayed in the area 101 by selecting the type of the bolt as described above (step S22). In the next step S23, a cursor is displayed at the position where the dimension is to be set. In this case, the cursor is positioned at any place of the dimension setting menu 102. The color of the symbol corresponding to the bolt portion corresponding to the position where the cursor is located in the bolt graphic area 101 is changed (step S24). At the same time, in the next step S25, a comment corresponding to the cursor position is displayed in the comment display column 103. While moving the cursor in the dimension setting menu 102, numerical values are input one after another at the place where the cursor is placed, and at the stage where all the numbers are input, a set key (SET key) among the function keys
When the user presses the button 22c, YES is determined in the determination step S26, and the input numerical value is determined (step S27). After this step S27, the dimension setting menu 102 is deleted (step S28), and subsequently, a bolt figure deletion (step S29) and a comment display column deletion (step S30) are executed. At this stage, the flowchart ends. On the other hand, if NO is determined in the determination step S26, it is determined in the next determination step S31 whether the clear key (CLR key) 22b is pressed.
When it is pressed, the numerical value is returned to the original value as YES (step S32). After step S32, the above-described steps S28, S29, and S30 are executed, and the flowchart ends. If NO is determined in the determination step S31, the cursor is moved using the movement key 22d, and in response to this, the determination step S33,
S34 is executed. If the determination in step S33 is YES, the currently displayed cursor is deleted (step S35), the dimension setting value is changed (step S36), and the process returns to the previous step S23. If the determination in step S34 is YES, the size change routine (stop S37) is executed, and if the determination is NO, the process returns to step S23. Thereafter, the above steps are repeated until the numerical value is determined.

In the bolt dimension setting screen 93, as an example, a column 1 for dimension setting is displayed in the dimension setting menu 102.
02a to 102g are provided, and the dimensions (L1, L2,
L3, D1, D2, P, d) 101a to 101g are designated. Columns 102a to 102g have dimensions 101 of each part.
a to 101 g, respectively.

In accordance with the operation of the above-described flowchart, the operator can set the bolt size by using the bolt size setting screen 93 which is a feature of the present embodiment displayed on the screen of the display unit 21. According to the configuration described above, the bolt figure, the dimension setting menu, and the comment column are displayed on the same screen, so that the operator can easily set the bolt dimension data without feeling troublesome to switch the screen. it can. By moving the cursor on the dimension setting menu, the color of the symbol on the bolt figure can be switched, so that the place where the dimension is set can be visually determined. In addition, since the comment is displayed correspondingly, it is possible to prevent an incorrect setting. In this way, measurement errors are reduced, and work efficiency can be improved.

[0049]

As apparent from the above description, the present invention has the following effects. According to the waveform superimposed display device in the ultrasonic bolt axial force measuring device according to the present invention,
The waveform and measurement points obtained in the initial value setting mode and axial force measurement mode are configured to be displayed on the same screen, so if the measurement points are misaligned, the measurement peak before tightening and the measurement peak after tightening Can be adjusted to have the same waveform portion, and erroneous measurement can be prevented. According to the waveform switching device in the ultrasonic bolt axial force measuring device according to the present invention, the waveform of the reflected echo is processed into various types at the time of measurement so that it can be used. The peak point used in the measurement in can be easily selected even in the measurement after tightening,
Further, the selection of the waveform used for the measurement can be widened and easily switched, so that the operability in use can be improved. According to the bolt size setting device in the ultrasonic bolt axial force measuring device according to the present invention, since the bolt figure, the size setting menu, and the comment column are displayed on the same display screen, the trouble of switching the screen is reduced. It is possible to eliminate the erroneous setting.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an internal structure of an electric circuit unit of an ultrasonic bolt axial force measuring device according to the present invention.

FIG. 2 is a front view showing a display unit and an operation unit on a front portion of a main body of the ultrasonic bolt axial force measuring device according to the present invention.

FIG. 3 is a diagram showing a waveform superimposed display according to the first embodiment of the present invention.

FIG. 4 is a flowchart for performing waveform superimposed display of the first embodiment.

FIG. 5 is a screen diagram showing a specific example of a waveform superimposed display in the first embodiment.

FIG. 6 is a diagram illustrating a first example of a menu screen according to the first embodiment.

FIG. 7 is a diagram illustrating a second example of the menu screen in the first embodiment.

FIG. 8 is a diagram illustrating a third example of the menu screen in the first embodiment.

FIG. 9 is a diagram showing an example of a screen layout used when setting bolt dimensions.

FIG. 10 is a circuit diagram showing an internal configuration of a receiver for performing waveform switching according to a second embodiment of the present invention.

FIG. 11 is a waveform chart showing various waveforms in the second embodiment.

FIG. 12 is a diagram illustrating a display example of a screen of a display unit for performing waveform switching according to the second embodiment.

FIG. 13 is a diagram showing a bolt dimension setting screen according to a third embodiment of the present invention.

FIG. 14 is a flowchart for performing bolt dimension setting according to a third embodiment.

FIG. 15 is a waveform diagram for explaining a transmission wave and a reflected echo used in a conventional ultrasonic bolt axial force measuring device.

FIG. 16 is a waveform diagram showing a waveform of a reflected echo in more detail.

FIG. 17 is a diagram for explaining a problem of a reflected echo waveform used in measurement.

[Explanation of symbols]

 Reference Signs List 11 apparatus main body 21 display section 21a screen 22 function keys 36 probe 38 volt 51 waveform display area 52 parameter setting area 57, 58 waveform 58, 59 measurement point 93 bolt dimension setting screen 94 bolt figure 101 bolt figure area 102 dimension setting menu 103 Comment display field

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazu Mizunoya 650 Kandamachi, Tsuchiura-shi, Ibaraki F-term in Hitachi Construction Machinery Finetech Co., Ltd.

Claims (3)

[Claims] 1. An ultrasonic measuring unit for applying an ultrasonic wave to a bolt, receiving a reflected echo thereof, and measuring the bolt with the ultrasonic wave propagating in the bolt, using the ultrasonic measuring unit The reflection time of the ultrasonic wave at the bolt is measured in the initial value setting mode in the no-load state and the axial force measurement mode in the loaded state, and the axial force of the bolt is measured from the relationship between the reflection times in the two modes. In the ultrasonic bolt axial force measuring device, in the measurement in the initial value setting mode, together with the measurement of the reflection time, to acquire the waveform and measurement points of the reflected echo,
Means for storing; means for acquiring the waveform of the reflected echo and a measurement point together with the measurement of the reflection time in the measurement in the axial force measurement mode; and Means for displaying the waveform of the reflected echo in the measurement mode and the measurement point, and selectively displaying the waveform of the reflected echo and the measurement point in the initial value setting mode at the same time in a superimposed manner. Characteristic superimposing display device in ultrasonic bolt axial force measuring device. 2. An ultrasonic measuring unit for applying an ultrasonic wave to a bolt, receiving a reflected echo of the ultrasonic wave, and measuring the bolt with the ultrasonic wave propagating in the bolt, using the ultrasonic measuring unit. The reflection time of the ultrasonic wave at the bolt is measured in the initial value setting mode in the no-load state and the axial force measurement mode in the loaded state, and the axial force of the bolt is measured from the relationship between the reflection times in the two modes. In the ultrasonic bolt axial force measuring device, a waveform operation circuit for generating a full-wave waveform, a positive half-wave waveform, a negative half-wave waveform, and an RF wave waveform based on the received reflected echo waveform; Selecting / switching means for selecting a waveform of a reflected echo used for measurement in the axial force measurement mode from any of the above-mentioned full-wave waveform, positive half-wave waveform, negative half-wave waveform, and RF waveform; Equipped with Waveform switching device in ultrasonic bolt axial force measuring device. 3. An ultrasonic measuring unit for applying an ultrasonic wave to a bolt, receiving a reflected echo thereof, and measuring the bolt with the ultrasonic wave propagating in the bolt, using the ultrasonic measuring unit. The reflection time of the ultrasonic wave at the bolt is measured in the initial value setting mode in the no-load state and the axial force measurement mode in the loaded state, and the axial force of the bolt is measured from the relationship between the reflection times in the two modes. Means for simultaneously displaying a bolt figure display area, a dimension setting display area, and a comment display area on the same screen of a display unit, the display content of the bolt figure display area, and the dimension setting display In the ultrasonic bolt axial force measurement device, further comprising: means for giving a relationship based on the correspondence between the display content of the area and the display content of the comment display area, Bolt size setting device.