atw 2019-02

atw Vol. 64 (2019) | Issue 2 ı February
parameters in the conversion formula
are related to the mechanical parameters,
such as the reduction ratio, the
lead of the screw, and so on. In order to
adapt to the different kind of equipment,
the software will open these
parameters and can be set up according
to different mechanical devices. The
generality of such a device is that the
conversion function calculates pulses
based on the mechani cal parameter
module. The user interface shows the
detection data classification in the
upper computer, set up the mechanical
para meter module, the motion parameter
module, automatically scan the
presupposed parameter module, the
manual scanning module, the servo
motor position and torque display
module, the servo motor switch
module, the data acquisition and
storage module. The LabVIEW controls
the main interface as shown in
Figure 6.
The functions of the software
modules are as follows:
a. Mechanical parameter module. In
order to adapt to the testing of
similar equipment in different
directions, the mechanical parameters
such as the speed reduction
ratio of the five servo motors, the
number of encoder lines, the lead
of the screw, and the diameter of
the gear indexing circle can be
customized respectively.
b. Motion parameter module. The
motion parameters such as acceleration,
speed reduction, manual
presupposition speed, automatic
presupposition speed, back zero
presupposition speed are customized
to meet the detection device at
the appropriate speed.
c. Automatic scanning of presupposition
parameters module. Automatic
scanning is based on the
motion parameters of the detecting
rod lifting motor and the detecting
rod rotating motor, and scanning
section based on the input of the
user. The detecting rod lifting
motor will move between scan
start and scan stop, and the speed
is specified by speed. The motion
range of the detecting rod rotating
motor is between scan start and
scan stop, and the rotation angle of
each cycle is step, so the number of
scavenging segments is (scan stopscan
start)/step.
d. Manual scanning module. Manual
interface is mainly used for manual
control of each axis, including
continuous movement and point
movement control. The continuous
motion control is the input relative
position and the speed of operation,
then click the button, the
motor will move to the relative
position at the set speed, and then
stop. The point control is to hold
the corresponding key, the motor
rotates according to its rotation
direction, releases the key, and the
motor stops.
e. Servo motor position and torque
display module. The operation
phase of the detection is displayed
in the main interface in the manner
of the position and torque of the
five servo motors.
f. Servo motor switch module. When
the signal light turns green, it indicates
that the servo motor has
started, is in the servo state, and
starts to move under the control of
the controller.
g. Data acquisition and storage
module. In accordance with the
requirements of the detection, the
progress of single bolt scanning
and the overall detection progress
are recorded in the upper computer
with the state of the running
bar. The root of the scavenging
section is used to judge the
damaged position of the bolt and
record the analysis in time.
5 Implementation of ultrasonic
testing process
The on-line ultrasonic testing method
for hollow flange bolts introduced in
this paper is a new type of testing
method. The mechanical detecting
device carries the ultrasonic probe to
scan from the inner wall of the hollow
flange bolt center hole by the thin
water layer contact method, and
realizes full-volume ultrasonic testing
on the threaded area of the hollow
flange bolt. After the control rod is
aligned with the inner wall of the
hollow flange bolt, the detection rod is
driven by the detecting rod lifting
motor to complete a rising scan, and
the detecting rod is driven by the
circumferential motor to rotate the
detecting rod 5°, and the detecting rod
lifting motor drives the detecting rod
to complete the lowering. A downward
scan, when reaching the bottom
of the hollow flange bolt, the detection
rod circumferential motor drive
detection lever is rotated 5° again, and
a scan cycle has been completed.
Repeat several times until the end of
the scan, a hollow flange bolt, and
then return to the starting position to
prepare to detect other hollow flange
bolts. The automatic scanning program
is written in the motion controller.
The parameters are expressed
| | Fig. 6.
LabVIEW control the main interface diagram.
| | Fig. 7.
Flow chart of automatic scanning program.
in variable form, and the upper
computer passes the assignment. And
call the program to achieve automatic
scanning. The specific detection process
is shown in Figure 7, and the
variables and their meanings are
shown in Table 1.
OPERATION AND NEW BUILD 101
Operation and New Build
Design of Control System for On-line Ultrasonic Testing Device of Nuclear Power Hollow Flange Bolt Based on LabVIEW ı Wenchao Lu, Huibin Yang, Juan Yan and Chengbo Kang