阅读说明：本技术 消除自动超声检测信号往复错位的方法及编码传输装置 (Method for eliminating reciprocating dislocation of automatic ultrasonic detection signal and coding transmission device ) 是由 余小侠 王羽翀 林百涛 滕木 彭恭斌 丁松 于 2020-06-10 设计创作，主要内容包括：本发明公开了消除自动超声检测信号往复错位的方法及编码装置,包括如下步骤：准备工作；对被检部件进行预检测,并保存预检测超声数据；对预检测超声数据进行分析；检测过程中,编码采集输入端口采集所有电机运动编码,并传输至信号转换模块；信号转换模块将增量式光电编码器所产生的差分信号转换为超声仪可以接受的单端信号；转换后的单端信号将全部输送至通道选择模块。本发明的有益效果在于：(1)原理简单,实现成本小；(2)集成度高；(3)参数可调节,适用范围广,通过预留参数修改超声信号错位值,自动计算以控制新编码传输装置在恰当的时机打开或关闭编码传输,以达到消除错位的目的。(The invention discloses a method for eliminating reciprocating dislocation of automatic ultrasonic detection signals and a coding device, comprising the following steps: preparing; pre-detecting the detected component and storing pre-detected ultrasonic data; analyzing the pre-detection ultrasonic data; in the detection process, the code acquisition input port acquires all motor motion codes and transmits the motor motion codes to the signal conversion module; the signal conversion module converts the differential signal generated by the incremental photoelectric encoder into a single-ended signal which can be accepted by the ultrasonic instrument; the converted single-ended signals are all transmitted to the channel selection module. The invention has the beneficial effects that: (1) the principle is simple, and the implementation cost is low; (2) the integration level is high; (3) the parameters are adjustable, the application range is wide, the ultrasonic signal dislocation value is modified through the reserved parameters, and the code transmission is automatically calculated to control the new code transmission device to open or close the code transmission at proper time, so that the purpose of eliminating dislocation is achieved.)

1. A method for eliminating reciprocating dislocation of automatic ultrasonic detection signals is characterized by comprising the following steps:

the method comprises the following steps: preparing, and connecting an automatic ultrasonic detection device;

step two: under the condition of not taking any correction measures, pre-detecting the detected component, and storing pre-detected ultrasonic data;

step three: analyzing the pre-detection ultrasonic data, and judging the ultrasonic reciprocating signal dislocation value through the key structure signal;

step four: inputting the ultrasonic reciprocating signal dislocation value obtained in the third step into control software to be used as an important basis for judging an instruction, and detecting the detected component again in a correction mode;

step five: in the detection process, the code acquisition input port acquires all motor motion codes and transmits the motor motion codes to the signal conversion module;

step six: the signal conversion module converts the differential signal generated by the incremental photoelectric encoder into a single-ended signal which can be accepted by the ultrasonic instrument;

step seven: the converted single-ended signals are all transmitted to a channel selection module;

step eight: in the initial stage of each scanning, the upstream control card can continuously judge whether the position code sent by the motor is equivalent to the ultrasonic reciprocating signal dislocation value input to the control software in the fourth step, when the position code and the ultrasonic reciprocating signal dislocation value are equivalent, the upstream control card sends a control instruction, the control instruction is transmitted to the channel selection module through the upstream control port and the control instruction input port, the channel selection module selectively opens a corresponding channel according to the requirement of the control instruction, and the position code signal is continuously transmitted;

step nine: the position coding signals continuously transmitted by the channel selection module are finally transmitted to the ultrasonic instrument through the optical coupling isolation module and the coding output port, so that reciprocating dislocation correction of the automatic ultrasonic inspection signals is realized.

2. The method of eliminating reciprocating misalignment of an automated ultrasonic test signal according to claim 1, wherein: the automatic ultrasonic detection device in the first step comprises a mechanical device, an electrical control system and an ultrasonic data acquisition system.

3. The method of eliminating reciprocating misalignment of an automated ultrasonic test signal according to claim 1, wherein: in the seventh step, in a default condition, all the channel selection modules are in a closed state, and the coded signals cannot be transmitted continuously.

4. The method of eliminating reciprocating misalignment of an automated ultrasonic test signal according to claim 1, wherein: in the step eight, the opened position coding transmission channel is continuously conducted until the current scanning step number detection is finished, and then the position coding transmission channel is automatically closed.

5. The encoding transmission device is characterized by specifically comprising: the system comprises a code input port, a signal conversion module, a control instruction input end, a channel selection module, an optical coupling isolation module and a code output port;

the coding input port is connected with a motor position information code and transmits the motor position information code to the signal conversion module;

the signal conversion module converts the motor position information code into a form which can be received by the ultrasonic instrument, and transmits the converted motor position information code to the channel selection module;

the control instruction input port is connected with the upstream control port, receives a control instruction and transmits the control instruction to the channel selection module;

the channel selection module receives the converted motor position information codes and control instructions;

the optical coupling isolation module has the function of isolating electromagnetic noise and also comprises an impedance matching circuit so as to reduce the reflection of the coded signal and ensure the quality of the coded signal;

and the coding output port is connected with the coding input port of the ultrasonic instrument and outputs the corrected signal to the ultrasonic instrument.

6. The encoded transmission unit of claim 5, wherein: the channel selection module selects one required motor position coding information and a plurality of required motor position coding information from the plurality of converted motor position coding information according to the detection requirement.

7. The encoded transmission unit of claim 5, wherein: the channel selection module receives the control instruction, and the codes are transmitted when being turned on or turned off, so that the codes transmitted to the ultrasonic instrument are ensured to be synchronous and equidistant with the motion of the probe.

8. The encoded transmission unit of claim 5, wherein: the control instruction received by the channel selection module can be adjusted according to actual conditions so as to be suitable for various automatic detection devices and various application scenes.

Technical Field

The invention belongs to the technical field of automatic ultrasonic nondestructive testing, and particularly relates to a method for eliminating reciprocating dislocation of an automatic ultrasonic testing signal and a coding transmission device.

Background

The primary loop system of the nuclear power station contains high-temperature and high-pressure cooling media during the operation of a reactor, if the primary loop system equipment is damaged and leaked, the unplanned temporary shutdown can be caused to cause huge economic loss, and even nuclear leakage accidents occur in severe cases, so the quality and safety of the primary loop equipment and the pipeline of the nuclear power station must be guaranteed, and the primary loop equipment and the pipeline are subjected to nondestructive detection at regular intervals in different stages of construction and operation of the primary loop equipment and the pipeline. Relevant national regulations clearly indicate that corresponding nondestructive testing of critical equipment is required according to relevant specifications, such as: ultrasound, visual, osmotic, etc.

The automatic ultrasonic detection can save labor, can also ensure the repeatability of detection and the reliability and accuracy of detection results, and is more and more generally applied to various nuclear power plants.

The automatic ultrasonic detection device mostly adopts a motor to drive an ultrasonic probe through a transmission mechanism, and carries out detection in a reciprocating motion mode on the surface of a detected part, as shown in figure 1; influenced by factors such as self rigidity of the automatic ultrasonic detection device, clearance of a transmission mechanism and the like, the automatic ultrasonic detection device can generate the following conditions: when the motor moves a certain distance at the beginning of each step of detection, the motor position coding signal is also sent to the ultrasonic instrument, but the probe does not start to move, so that the problem of dislocation of reciprocating automatic ultrasonic detection signals can be caused, as shown in fig. 2 and 3; in order to ensure the accuracy of ultrasonic detection position information and the validity of a detection result, necessary measures must be taken to eliminate the problem of signal reciprocating dislocation.

The automatic ultrasonic detection device is influenced by the safety level and detection standard of the detected component, the size, shape, external outline, surrounding environment and other factors, and the automatic ultrasonic detection device is often required to be designed in an adaptive manner, so that various automatic ultrasonic detection devices can appear, and the reciprocating dislocation sizes of different automatic ultrasonic detection devices are different; practice shows that even if the same type of automatic ultrasonic detection device faces different detection objects, the degree of reciprocating dislocation of signals can be different under the influence of installation conditions.

Disclosure of Invention

The invention aims to provide a method and a coding device for eliminating reciprocating dislocation of automatic ultrasonic detection signals, which can eliminate the reciprocating dislocation of the signals of different automatic ultrasonic detection devices under different application scenes by combining software and hardware and adjusting parameters in real time.

The technical scheme of the invention is as follows: a method for eliminating reciprocating dislocation of automatic ultrasonic detection signals comprises the following steps:

the method comprises the following steps: preparing, and connecting an automatic ultrasonic detection device;

step two: under the condition of not taking any correction measures, pre-detecting the detected component, and storing pre-detected ultrasonic data;

step three: analyzing the pre-detection ultrasonic data, and judging the ultrasonic reciprocating signal dislocation value through the key structure signal;

step four: inputting the ultrasonic reciprocating signal dislocation value obtained in the third step into control software to be used as an important basis for judging an instruction, and detecting the detected component again in a correction mode;

step five: in the detection process, the code acquisition input port acquires all motor motion codes and transmits the motor motion codes to the signal conversion module;

step six: the signal conversion module converts the differential signal generated by the incremental photoelectric encoder into a single-ended signal which can be accepted by the ultrasonic instrument;

step seven: the converted single-ended signals are all transmitted to a channel selection module;

step eight: in the initial stage of each scanning, the upstream control card can continuously judge whether the position code sent by the motor is equivalent to the ultrasonic reciprocating signal dislocation value input to the control software in the fourth step, when the position code and the ultrasonic reciprocating signal dislocation value are equivalent, the upstream control card sends a control instruction, the control instruction is transmitted to the channel selection module through the upstream control port and the control instruction input port, the channel selection module selectively opens a corresponding channel according to the requirement of the control instruction, and the position code signal is continuously transmitted;

step nine: the position coding signals continuously transmitted by the channel selection module are finally transmitted to the ultrasonic instrument through the optical coupling isolation module and the coding output port, so that reciprocating dislocation correction of the automatic ultrasonic inspection signals is realized.

The automatic ultrasonic detection device in the first step comprises a mechanical device, an electrical control system and an ultrasonic data acquisition system.

In the seventh step, under the default condition, all the channel selection modules are in the closed state, and the coded signals cannot be transmitted continuously;

in the step eight, the opened position coding transmission channel is continuously conducted until the current scanning step number detection is finished, and then the position coding transmission channel is automatically closed.

The encoding transmission device specifically comprises: the system comprises a code input port, a signal conversion module, a control instruction input end, a channel selection module, an optical coupling isolation module and a code output port;

the coding input port is connected with a motor position information code and transmits the motor position information code to the signal conversion module;

the signal conversion module converts the motor position information code into a form which can be received by the ultrasonic instrument, and transmits the converted motor position information code to the channel selection module;

the control instruction input port is connected with the upstream control port, receives a control instruction and transmits the control instruction to the channel selection module;

the channel selection module receives the converted motor position information codes and control instructions;

the optical coupling isolation module has the function of isolating electromagnetic noise and also comprises an impedance matching circuit so as to reduce the reflection of the coded signal and ensure the quality of the coded signal;

and the coding output port is connected with the coding input port of the ultrasonic instrument and outputs the corrected signal to the ultrasonic instrument.

The channel selection module selects one required motor position coding information and a plurality of required motor position coding information from the plurality of converted motor position coding information according to the detection requirement.

The channel selection module receives the control instruction, and the codes are transmitted when being turned on or turned off, so that the codes transmitted to the ultrasonic instrument are ensured to be synchronous and equidistant with the motion of the probe.

The control instruction received by the channel selection module can be adjusted according to actual conditions so as to be suitable for various automatic detection devices and various application scenes.

The invention has the beneficial effects that: the method solves the problem of reciprocating dislocation of signals caused by factors such as the rigidity of the automatic ultrasonic detection device or the clearance of a transmission mechanism in the automatic ultrasonic detection process, and has the following advantages:

(1) the principle is simple, and the implementation cost is little: in the aspect of hardware, the mechanical device structure and the electrical control system of the existing automatic ultrasonic detection device are not changed, and only the original coding transmission device is replaced; a judgment instruction and a channel selection instruction are added in the aspect of software;

(2) the integration level is high: the coding transmission device integrates the functions of coding acquisition, signal conversion, coding on-off control, coding channel selection, coding transmission noise isolation, coding transmission, impedance matching and the like;

(3) the parameters are adjustable, the application range is wide, the ultrasonic signal dislocation value is modified through the reserved parameters, and the code transmission is automatically calculated to control the new code transmission device to open or close the code transmission at proper time, so that the purpose of eliminating dislocation is achieved. Because the parameters can be modified, the method is suitable for various application scenes of various devices.

Drawings

FIG. 1 is a schematic view of a reciprocating scan;

FIG. 2 is a schematic diagram of a reciprocating scanning signal dislocation;

FIG. 3 is a schematic diagram of a normal signal of a reciprocating scan;

FIG. 4 is a schematic diagram of an encoding transmission apparatus according to the present invention;

fig. 5 is a flowchart of a method for eliminating reciprocating misalignment of an automatic ultrasonic detection signal according to the present invention.

In the figure, the following steps: firstly, scanning a track line, namely: first step stepping trajectory line, c: defect, iv: reciprocating scanning dislocation signals, and fifthly: and scanning normal signals repeatedly.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

In order to solve the technical problems, the invention provides a novel coding transmission device by improving the existing coding transmission device according to the requirements, and a channel selection module is added to the original coding transmission device on the basis that the mechanical device structure and the electrical control system of the existing automatic ultrasonic detection device are not changed, so that the novel coding transmission device is formed.

Correspondingly, a judgment instruction and a channel selection instruction are added, a variable parameter port is reserved in the judgment instruction, and parameters can be modified according to the reciprocating dislocation value of the automatic ultrasonic detection signal. And the upstream control card analyzes and judges the motor position coding signals acquired in real time according to the judgment instruction, and sends a channel selection instruction to the coding transmission device according to the judgment result so as to open or close coding transmission at proper time.

As shown in fig. 4, the encoding transmission apparatus specifically includes:

coding input port: connecting the motor position information code, and transmitting the motor position information code to the signal conversion module;

the signal conversion module: the motor position information codes are converted into a form which can be received by the ultrasonic instrument, and the converted motor position information codes are transmitted to the channel selection module;

control instruction input port: the upstream control port is connected, receives a control instruction and transmits the control instruction to the channel selection module;

a channel selection module: receiving the converted motor position information code and control instruction, and realizing two functions: 1. selecting one required and a plurality of converted motor position coding information from the plurality of converted motor position coding information according to the detection requirement; 2. and receiving a control instruction, and turning on or off code transmission at proper time to ensure that the codes transmitted to the ultrasonic instrument are synchronous and equidistant with the motion of the probe. Meanwhile, the control instruction received by the channel selection module can be adjusted according to the actual situation so as to be suitable for various automatic detection devices and various application scenes;

the optical coupling isolation module: the electromagnetic noise isolation circuit has the function of isolating electromagnetic noise, and simultaneously an impedance matching circuit is designed to reduce the reflection of the coded signal and ensure the quality of the coded signal;

and an encoding output port: and connecting the coding input port of the ultrasonic instrument and outputting the corrected signal to the ultrasonic instrument.

As shown in fig. 5, a method for eliminating reciprocating misalignment of an automatic ultrasonic detection signal includes the following steps:

the method comprises the following steps: preparing, connecting an automatic ultrasonic detection device, comprising a mechanical device, an electrical control system, an ultrasonic data acquisition system and the like;

step two: under the condition of not taking any correction measures, pre-detecting the detected component, and storing pre-detected ultrasonic data;

step three: analyzing the pre-detection ultrasonic data, mainly analyzing the position deviation of two adjacent steps of the fixed structure signal of the detected part fed back in the pre-detection ultrasonic data in the scanning direction, and dividing the position deviation by 2 to obtain the ultrasonic reciprocating signal dislocation value;

step four: inputting the ultrasonic reciprocating signal dislocation value obtained in the third step into control software, and discarding the position coding signal equal to the dislocation value at the initial stage of each scanning step by the control channel selection module after the control software receives the ultrasonic reciprocating signal dislocation value; detecting the detected component again in the correction mode;

step five: in the detection process, all motor motion codes can be collected by the code collection input port and transmitted to the signal conversion module without omission.

Step six: the signal conversion module converts the differential signal generated by the incremental photoelectric encoder into a single-ended signal which can be accepted by the ultrasonic instrument;

step seven: the converted single-ended signals are all transmitted to the channel selection module, and under the default condition, the channel selection module is all in a closed state, and the coded signals cannot be transmitted continuously;

step eight: in the initial stage of each scanning, the upstream control card can continuously judge whether the position code sent by the motor is equal to the ultrasonic reciprocating signal dislocation value input to the control software in the fourth step, when the position code sent by the motor is equal to the ultrasonic reciprocating signal dislocation value input to the control software in the fourth step, the upstream control card can send a control instruction, the control instruction is transmitted to the channel selection module through the upstream control port and the control instruction input port, the channel selection module selectively opens a corresponding channel according to the requirement of the control instruction, and the position code signal can be continuously transmitted. The opened position coding transmission channel can be continuously conducted until the current scanning step number detection is finished and then is automatically closed.

Step nine: the position coding signals continuously transmitted by the channel selection module are removed, deviation position coding signals caused by transmission gaps or mechanical rigidity when the starting point is scanned in each step are removed, the moving distance and speed of the probe are really fed back, and finally the signals are sent to the ultrasonic instrument through the optical coupling isolation module and the coding output port so as to realize correction of reciprocating dislocation of automatic ultrasonic inspection signals.

The invention relates to the technical field of ultrasonic nondestructive testing, and discloses a method for eliminating reciprocating dislocation of automatic ultrasonic testing signals and a coding transmitter device thereof. The hardware structure comprises a coding input/output port, a signal conversion module, an optical coupling isolation module, a coding selection module, a control instruction input port and the like. And a judgment instruction and a channel selection instruction are added in the aspect of software. When the defect position displayed by the ultrasonic reciprocating signal is dislocated with the actual defect position, the ultrasonic signal dislocation value is modified by the method, and the software automatically calculates to control the channel selection module to open or close the code transmission at a proper time so as to achieve the purpose of eliminating the reciprocating signal dislocation.

The channel selection module can realize the selective output of the multi-channel signals;

the judgment instruction and the channel selection instruction reserve a variable parameter port, and are suitable for various application scenes of various automatic ultrasonic inspection devices. When the signal is dislocated, the ultrasonic signal dislocation value is modified through a software reserved parameter port according to the actual ultrasonic signal reciprocating dislocation value, and software automatically calculates to control a new coding transmitter to open or close coding transmission at a proper time, so that the purpose of eliminating the signal dislocation is achieved.

Example (b):

a loop of a certain domestic power station has a columnar main device which needs automatic ultrasonic inspection, and one set of specially designed automatic inspection equipment is used for realizing automatic ultrasonic axial (along the direction of a rotating central shaft of the columnar main device) and circumferential (along the circumferential direction of the columnar main device) inspection of the inner surface of the columnar main device. The equipment has 3 motion axes which are respectively as follows: height adjusting axis Z, circumferential rotation axis A and axial scanning axis C. Each shaft is driven by a separate motor, wherein the height adjusting shaft Z is only used for adjusting the position of the automatic inspection device relative to the columnar main equipment and does not directly participate in scanning, and the Z-axis motor code is not sent to the ultrasonic instrument as position information; the axial scanning shaft C and the circumferential rotating shaft A form a scanning component, and the ultrasonic probe is driven in a combined mode to complete scanning track motion. The ultrasonic probe is arranged on an axial scanning shaft C of the scanning component, the axial scanning shaft C comprises the ultrasonic probe and is arranged on the circumferential rotating shaft A together, and finally, the scanning component (comprising an A shaft and a C shaft) and the probe are arranged on the height adjusting shaft Z together.

When scanning in the circumferential direction: the A axis is used as a scanning axis, the C axis is used as a stepping axis, so the A axis motor code is sent to the ultrasonic instrument (note: the motor motion code is incremental high and low level signals, the counter is increased by 1 when the ultrasonic instrument receives a high level signal in forward motion, and the counter is decreased by 1 when the ultrasonic instrument receives a high level signal in reverse motion) as scanning direction position information, and the C axis motor code is sent to the ultrasonic instrument as stepping direction position information. When scanning the axis: the C axis is used as a scanning axis, the A axis is used as a stepping axis, so that the C axis motor code is sent to the ultrasonic instrument as scanning direction position information, and the A axis motor code is sent to the ultrasonic instrument as stepping direction position information.

However, in the actual use process of the device, it is found that the axial scanning shaft C is decelerated due to the use of a plurality of gears in the transmission structure, and gaps exist in the meshing between the gears, which finally results in that: in the range of 2-4 mm after the C-axis motor is in reversing motion (if the motor rotates clockwise to rotate anticlockwise), because of the existence of gear gaps, although the motor moves, the motor codes are also sent to the ultrasonic instrument, but the probe does not move at the moment, the original code sending device can only collect and send the motor motion codes in real time and cannot process the motor motion codes, even if the motor moves and the ultrasonic probe does not move, the original code sending device still sends the motor motion codes to the ultrasonic instrument in real time, so that the ultrasonic instrument mistakenly considers that the ultrasonic probe has moved, and the reciprocating dislocation of ultrasonic signals can occur. It has also been found that the gap is not the same every time the test device is reinstalled.

If the automatic ultrasonic inspection signal dislocation eliminating method is introduced at this time, the problems can be solved.

For circumferential scanning, the axis A is used as the axis A, so that the axis A reciprocates in the scanning process, the axis C is used as the stepping axis and always moves in one direction, reversing motion does not exist, and reciprocating signal dislocation cannot be caused by gear gaps. At the moment, the motion code of the A-axis motor is set as a scanning code, the motion code of the C-axis motor is set as a scanning code, and the adjustment parameter is 0.

For axial scanning, the scanning axis is the C axis, and the reversing motion exists, so the correction is needed. At the moment, the C-axis motor motion code is required to be set as a scanning code, the A-axis motor motion code is a scanning code, the adjusting parameters are set according to the measured values, and the specific operation steps are as follows:

(1) setting the adjusting parameter to be 0, carrying out axial scanning on the columnar main equipment, and storing ultrasonic data;

(2) analyzing the ultrasonic data acquired in the first step, and obtaining a difference (for example, 3mm) between the position information of the ultrasonic data acquired in the first step and the actual size of the columnar main equipment by combining the existing key mark points or characteristic structures on the columnar main equipment;

(3) setting the adjusting parameter to be 3mm, carrying out axial scanning again, and storing data;

(4) at this time, the encoding and transmitting device starts to operate: within 0 ~ 3mm interval that C axle motor commutates to the positive direction motion each time, C axle motor takes place the motion, and C axle motor motion code also can be gathered by code sending device, but code sending device receives upstream instruction control: within 0-3 mm, collected C-axis motor motion codes are not sent to the ultrasonic instrument, only when the upstream instruction judges that the C-axis motor motion distance exceeds 3mm, a C-axis motor motion code sending channel is opened, the probe just starts to move at the moment, and the ultrasonic instrument position code counter starts to count in an accumulated mode from 0, so that the position information received by the ultrasonic instrument is equal to the ultrasonic probe motion distance; in a similar way, the C-axis motor moves in the 0-3 mm interval after the C-axis motor is reversed every time, the C-axis motor motion code can be collected by the code sending device, but the code sending device is controlled by an upstream instruction: within 0-3 mm after reversing, collected C-axis motor motion codes are not sent to the ultrasonic instrument, only when an upstream instruction judges that the motion distance of the C-axis motor exceeds 3mm after reversing, a C-axis motor motion code sending channel is opened, the probe just starts to move at the moment, and the ultrasonic instrument position code counter starts to count up and down according to the position code maximum value obtained by accumulation after forward motion, so that the position information received by the ultrasonic instrument is ensured to be the same as the motion distance of the ultrasonic probe;

(5) and analyzing the ultrasonic data acquired after the adjustment parameter is set to be 3mm again, judging whether the reciprocating dislocation of the signal is eliminated, and repeating the steps if the reciprocating dislocation of the signal is not eliminated.