阅读说明：本技术 一种金属表面覆层耐温与相对膨胀系数的检测方法和装置 (Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating ) 是由 林俊明 沈功田 沈建中 沈淮 于 2021-04-12 设计创作，主要内容包括：本发明一种金属表面覆层耐温与相对膨胀系数的检测方法和装置,用于金属基体(1)的表面覆层(11)的耐温与相对膨胀系数的无损检测,通过引线(21)联接于检测仪器(2),包括检测传感器装置(3)和数字式温度传感器(4),其特征在于所述的检测传感器装置(3)还包括可作为加热线圈的材料制作而成的涡流线圈(31)以及用于提取涡流线圈(31)的温度信号的温度信号提取装置(32),所述的数字式温度传感器(4)设置于检测传感器装置(3)下方检测时贴向金属表面覆层(11)的一边侧面。实现检测装置中的简单加热结构,从而达到检测耐温与相对膨胀系数等各种参数的目的,对加热温度实现数字化控制,以及保证在温度变化中涡流检测传感器装置的检测数据的精确度。(The invention relates to a method and a device for detecting the temperature resistance and the relative expansion coefficient of a metal surface coating, which are used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of a surface coating (11) of a metal substrate (1) and are connected to a detection instrument (2) through a lead (21), and the device comprises a detection sensor device (3) and a digital temperature sensor (4), and is characterized in that the detection sensor device (3) also comprises an eddy current coil (31) made of a material capable of being used as a heating coil and a temperature signal extraction device (32) used for extracting a temperature signal of the eddy current coil (31), and the digital temperature sensor (4) is arranged below the detection sensor device (3) and is attached to one side surface of the metal surface coating (11) during detection. The simple heating structure in the detection device is realized, so that the purpose of detecting various parameters such as temperature resistance, relative expansion coefficient and the like is achieved, the heating temperature is digitally controlled, and the accuracy of detection data of the eddy current detection sensor device in temperature change is ensured.)

1. A method for detecting the temperature resistance and the relative expansion coefficient of a metal surface coating is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating of a metal substrate, and is characterized in that an eddy current detection coil in a detection device is made of a material which can be used as a heating coil at the same time, and the method comprises the following specific steps:

a. setting heating temperature: after the detection device is started, setting the temperature of the metal matrix and the coating of the metal matrix to be heated according to the temperature resistance of the material to be detected, and inputting the temperature into a detection instrument;

b. and (3) calculating the detection time sequence: b, calculating the time required to be heated in the detection according to the heating temperature set in the step a and the surface temperature of the on-site coating, calculating the time required by the first eddy current lift-off value detection and the time required by the second eddy current lift-off value detection, and displaying the time on a display screen of a detection instrument;

c. actual detection:

c1. detecting a first eddy current lift-off value: carrying out first eddy current lift-off value detection on the metal matrix and the coating by using a detection probe, and simultaneously detecting and extracting a temperature signal by using an eddy current coil;

c2. heating by eddy current: the eddy current detection coil is switched to an eddy current heat effect heating function, the metal matrix is heated by an eddy current electromagnetic induction principle, and heat is transferred to the coating;

c3. and (3) detecting a second eddy current lift-off value: carrying out secondary eddy current lift-off value detection on the metal matrix and the coating by using the detection probe, and simultaneously detecting and extracting a temperature signal by using the eddy current coil;

c4. temperature compensation of eddy current signals: comparing and analyzing the temperature of the eddy current coil during the first eddy current lift-off value detection and the second eddy current lift-off value detection, calculating an eddy current signal compensation value, and compensating an eddy current temperature difference detection signal value;

c4. and (3) detecting data storage and display: b, outputting a detection signal, and returning to the step b for repeated detection;

d. comprehensively analyzing temperature resistance and relative expansion coefficients: and (4) carrying out multiple detection and comprehensive analysis on detection signal data at different positions, evaluating the temperature resistance and the relative expansion coefficient of the coating on the outer surface of the metal matrix, and storing and displaying the temperature resistance and the relative expansion coefficient in a detection instrument.

2. The method of claim 1, wherein the step of calculating the timing sequence of detection in step b further comprises a step of restarting the refresh using a switch to perform a return to repeat detection.

3. A method as claimed in claim 2, wherein the switch for performing the restart refresh is a signal indicating the detection of a change in position.

4. The method as claimed in claim 2, wherein the switch for performing the restart refresh is a manual restart switch.

5. The utility model provides a detection device of metal surface coating temperature resistance and relative expansion coefficient for the nondestructive test of the temperature resistance of the surface coating (11) of metal matrix (1) and relative expansion coefficient, couple in detecting instrument (2) through lead wire (21), including detection sensor device (3) and digital temperature sensor (4), characterized by that detection sensor device (3) still include eddy current coil (31) that can form as the material preparation of heating coil and temperature signal extraction element (32) that are used for extracting the temperature signal of eddy current coil (31), digital temperature sensor (4) set up and paste one side of metal surface coating (11) when detecting in detection sensor device (3) below.

6. The device for detecting the temperature resistance and the relative expansion coefficient of the metal surface coating according to claim 5, wherein the eddy current coil (31) is a spiral planar coil made of constantan wire material which is simultaneously suitable for eddy current detection and eddy current thermal effect heating.

7. The metal surface coating temperature-resistant and relative expansion coefficient detection device according to claim 5 or 6, further comprising a heating device (33), a detection device (34) and an analog switch device (35), wherein two nodes of the eddy current coil (31) are switchably connected to the heating device (33), the detection device (34) and the temperature signal extraction device (32) through the analog switch device (35).

8. A detection system for the temperature resistance and the relative expansion coefficient of a metal surface coating is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating of a metal substrate, and is characterized in that an eddy current detection coil in a detection device is made of a material which can be used as a heating coil at the same time, the detection system comprises a power module (51), a heating module (52), a detection module (53), a detection data recording, storing and displaying module (54) and a detection data comprehensive analysis and processing module (55), wherein the power module (51) comprises an eddy current heating power module (512), an eddy current detection excitation signal source module (513) and a switch module (511) for switching between the eddy current heating power source and the eddy current detection excitation signal source, the heating module (52) comprises a temperature setting module (521), a heating time calculation module (522) and a return detection refresh switch module (523), the detection module (53) comprises a coating temperature extraction module (531), a coil temperature detection extraction module (532) and an eddy current detection signal module (533).

9. The system for detecting the temperature resistance and the relative expansion coefficient of a metal surface coating according to claim 8, wherein said heating time calculating module (522) further comprises an automatic heating time adjusting module (5221) for automatically calculating the adjusted heating time after comparing the temperature of the upper surface of the metal surface coating during each detection refresh and a manual heating time setting module (5222) for facilitating the manual operation of the user to adjust the heating time.

Technical Field

The invention relates to the technical field of electromagnetic nondestructive testing, in particular to detection of a non-conductive coating on the surface of a metal substrate, and particularly relates to a method and a device for detecting temperature resistance and relative expansion coefficient of a coating on the surface of a metal.

Background

The surface of the metal matrix structural part is easy to generate chemical reaction and wear corrosion under the mechanical action, thereby causing huge economic loss. Therefore, the metal surface treatment is very important, such as the surface treatment of rails and rails, the surface treatment of parts and accessories of vehicles and airplanes, and the like, and mainly comprises the step of adding a covering layer, such as an electrodeposition layer, an autocatalytic coating layer, a spray coating layer, an oxidation complex film layer and the like, on the metal surface, and the requirements of the covering layer are strict in order to adapt to the application of a metal matrix structure. In many special industrial application occasions, the temperature resistance and the relative expansion coefficient of the non-conductive coating on the surface of the metal matrix are required to be detected so as to ensure the normal use of the metal matrix structural component.

However, temperature resistance and thermal expansion coefficient are both temperature dependent, and it is necessary to test the metal base structure and its surface coating at the corresponding temperatures. The additional heating device is added, the detection device becomes complicated and burdensome, the temperature is not easy to control, and the temperature can also affect the detection sensor, so that the accuracy of detection data cannot be ensured.

Aiming at the problems of the defects, the invention adopts the following technical scheme to improve.

Disclosure of Invention

The invention aims to provide a method and a device for detecting temperature resistance and relative expansion coefficient of a metal surface coating, and the technical scheme is as follows:

a method for detecting the temperature resistance and the relative expansion coefficient of a metal surface coating is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating of a metal substrate, and is characterized in that an eddy current detection coil in a detection device is made of a material which can be used as a heating coil at the same time, and the method comprises the following specific steps:

a. setting heating temperature: after the detection device is started, setting the temperature of the metal matrix and the coating of the metal matrix to be heated according to the temperature resistance of the material to be detected, and inputting the temperature into a detection instrument;

b. and (3) calculating the detection time sequence: b, calculating the time required to be heated in the detection according to the heating temperature set in the step a and the surface temperature of the on-site coating, calculating the time required by the first eddy current lift-off value detection and the time required by the second eddy current lift-off value detection, and displaying the time on a display screen of a detection instrument;

c. actual detection:

c1. detecting a first eddy current lift-off value: carrying out first eddy current lift-off value detection on the metal matrix and the coating by using a detection probe, and simultaneously detecting and extracting a temperature signal by using an eddy current coil;

c2. heating by eddy current: the eddy current detection coil is switched to an eddy current heat effect heating function, the metal matrix is heated by an eddy current electromagnetic induction principle, and heat is transferred to the coating;

c3. and (3) detecting a second eddy current lift-off value: carrying out secondary eddy current lift-off value detection on the metal matrix and the coating by using the detection probe, and simultaneously detecting and extracting a temperature signal by using the eddy current coil;

c4. temperature compensation of eddy current signals: comparing and analyzing the temperature of the eddy current coil during the first eddy current lift-off value detection and the second eddy current lift-off value detection, calculating an eddy current signal compensation value, and compensating an eddy current temperature difference detection signal value;

c4. and (3) detecting data storage and display: b, outputting a detection signal, and returning to the step b for repeated detection;

d. comprehensively analyzing temperature resistance and relative expansion coefficients: and (4) carrying out multiple detection and comprehensive analysis on detection signal data at different positions, evaluating the temperature resistance and the relative expansion coefficient of the coating on the outer surface of the metal matrix, and storing and displaying the temperature resistance and the relative expansion coefficient in a detection instrument.

Wherein, the detection time sequence calculation in the step b further comprises a step of restarting and refreshing by using a switch, and return repeated detection is carried out. The switch for restarting refreshing is a signal for detecting position change; or the switch for restarting and refreshing is a manual restart switch.

The invention also discloses a device for detecting the temperature resistance and the relative expansion coefficient of the metal surface coating, which is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating (11) of the metal substrate (1) and is connected to a detection instrument (2) through a lead (21), and comprises a detection sensor device (3) and a digital temperature sensor (4), and the device is characterized in that the detection sensor device (3) also comprises an eddy current coil (31) made of a material capable of being used as a heating coil and a temperature signal extraction device (32) used for extracting a temperature signal of the eddy current coil (31), and the digital temperature sensor (4) is arranged below the detection sensor device (3) and is attached to one side surface of the metal surface coating (11) during detection.

Wherein, the eddy current coil (31) is a spiral plane coil which is made of constantan wire material and can be simultaneously suitable for eddy current detection and eddy current heat effect heating. The eddy current coil temperature detection device is characterized by further comprising a heating device (33), a detection device (34) and an analog switch device (35), wherein two nodes of the eddy current coil (31) are connected to the heating device (33), the detection device (34) and the temperature signal extraction device (32) in a switchable mode through the analog switch device (35).

In addition, the invention also discloses a detection system for the temperature resistance and the relative expansion coefficient of the metal surface coating, which is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating of the metal substrate and is characterized in that an eddy current detection coil in a detection device is made of a material which can be used as a heating coil at the same time, the detection device comprises a power module (51), a heating module (52), a detection data recording, storing and displaying module (54) and a detection data comprehensive analysis and processing module (55), wherein the power module (51) comprises an eddy current heating power module (512), an eddy current detection excitation signal source module (513) and a switch module (511) for switching between the eddy current heating power source and the eddy current detection excitation signal source, the heating module (52) comprises a temperature setting module (521), a heating time calculation module (522) and a return detection refresh switch module (523), the detection module (53) comprises a coating temperature extraction module (531), a coil temperature detection extraction module (532) and an eddy current detection signal module (533).

The heating time calculation module (522) further comprises a heating time automatic adjustment module (5221) for automatically calculating and adjusting the heating time after comparing the surface temperature of the metal surface coating during each detection and refresh, and a heating time manual setting module (5222) for facilitating the manual operation of a user to adjust the heating time.

According to the technical scheme, the invention has the following beneficial effects:

when the heating and detecting sensor element is in work, high-frequency alternating current is utilized, a coil made of constantan wire is used for heating a metal matrix according to the electromagnetic induction principle, so that heat energy is generated and is transferred to a coating, and a simple heating structure is realized;

secondly, the invention realizes the calculation of the expansion coefficient of the coating in a certain temperature range by detecting the eddy current lift-off value before heating (measuring the lift-off signal of the metal substrate and the non-conductive coating), detecting the second eddy current lift-off value after being heated for a certain time and the temperature is relatively stable, and comparing the values detected twice, and meanwhile, during the test period of the eddy current tester, the insulation resistance tester can be accessed in time to test the insulation performance of the coating, thereby achieving the purpose of detecting various parameters such as temperature resistance, relative expansion coefficient and the like;

the digital coating surface temperature sensor arranged below the detection sensor device is used for detecting the coating surface temperature in real time, so that the heating temperature is digitally controlled;

and fourthly, a device for extracting the temperature signal of the eddy current coil is additionally arranged on the eddy current coil, and the signal during eddy current detection is subjected to temperature compensation in real time, so that the accuracy of the detection data of the eddy current detection sensor device in temperature change is further ensured.

Drawings

FIG. 1 is a schematic illustration of a process flow of a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a detection operation status according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of a coil structure in accordance with a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of a system module in accordance with a preferred embodiment of the present invention;

FIG. 5 is a circuit diagram of the preferred embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.

As shown in the flow chart of FIG. 1, a method for detecting the temperature resistance and the relative expansion coefficient of a metal surface coating is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating of a metal substrate, and is characterized in that an eddy current detection coil in a detection device is made of a material which can be simultaneously used as a heating coil, and the method comprises the following specific steps:

a. setting heating temperature: after the detection device is started, setting the temperature of the metal matrix and the coating of the metal matrix to be heated according to the temperature resistance of the material to be detected, and inputting the temperature into a detection instrument;

b. and (3) calculating the detection time sequence: b, calculating the time required to be heated in the detection according to the heating temperature set in the step a and the surface temperature of the on-site coating, calculating the time required by the first eddy current lift-off value detection and the time required by the second eddy current lift-off value detection, and displaying the time on a display screen of a detection instrument;

c. actual detection:

c1. detecting a first eddy current lift-off value: carrying out first eddy current lift-off value detection on the metal matrix and the coating by using a detection probe, and simultaneously detecting and extracting a temperature signal by using an eddy current coil;

c2. heating by eddy current: the eddy current detection coil is switched to an eddy current heat effect heating function, the metal matrix is heated by an eddy current electromagnetic induction principle, and heat is transferred to the coating;

c3. and (3) detecting a second eddy current lift-off value: carrying out secondary eddy current lift-off value detection on the metal matrix and the coating by using the detection probe, and simultaneously detecting and extracting a temperature signal by using the eddy current coil;

c4. temperature compensation of eddy current signals: comparing and analyzing the temperature of the eddy current coil during the first eddy current lift-off value detection and the second eddy current lift-off value detection, calculating an eddy current signal compensation value, and compensating an eddy current temperature difference detection signal value;

c4. and (3) detecting data storage and display: b, outputting a detection signal, and returning to the step b for repeated detection;

d. comprehensively analyzing temperature resistance and relative expansion coefficients: and (4) carrying out multiple detection and comprehensive analysis on detection signal data at different positions, evaluating the temperature resistance and the relative expansion coefficient of the coating on the outer surface of the metal matrix, and storing and displaying the temperature resistance and the relative expansion coefficient in a detection instrument.

Wherein, the detection time sequence calculation in the step b further comprises a step of restarting and refreshing by using a switch, and return repeated detection is carried out. The switch for restarting refreshing is a signal for detecting position change; or the switch for restarting and refreshing is a manual restart switch.

As shown in FIG. 2, the invention also discloses a device for detecting the temperature resistance and the relative expansion coefficient of the metal surface coating, which is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating 11 of the metal substrate 1, is connected to a detection instrument 2 through a lead 21, and comprises a detection sensor device 3 and a digital temperature sensor 4, and is characterized in that the detection sensor device 3 further comprises an eddy current coil 31 made of a material capable of being used as a heating coil and a temperature signal extraction device 32 used for extracting a temperature signal of the eddy current coil 31, and the digital temperature sensor 4 is arranged below the detection sensor device 3 and is attached to one side surface of the metal surface coating 11 during the detection.

The eddy current coil 31 is a spiral planar coil made of constantan wire material suitable for eddy current detection and eddy current thermal effect heating. The temperature signal extraction device further comprises a heating device 33, a detection device 34 and an analog switch device 35, wherein two nodes of the eddy current coil 31 are connected with the heating device 33, the detection device 34 and the temperature signal extraction device 32 in a switchable mode through the analog switch device 35.

As shown in FIG. 4, the invention also discloses a detection system 5 for the temperature resistance and the relative expansion coefficient of the metal surface coating, which is used for the nondestructive detection of the temperature resistance and the relative expansion coefficient of the surface coating of the metal substrate, and is characterized in that an eddy current detection coil in the detection device is made of a material which can be simultaneously used as a heating coil, and comprises a power module 51, a heating module 52, a detection data recording, storing and displaying module 54 and a detection data comprehensive analysis processing module 55, wherein the power module 51 comprises an eddy current heating power module 512, an eddy current detection excitation signal source module 513 and a switch module 511 for switching between the eddy current heating power and the eddy current detection excitation signal source, the heating module 52 comprises a temperature setting module 521, a heating time calculation module 522 and a return detection refresh switch module 523, and the detection module 53 comprises a coating temperature extraction module 531, a coating temperature extraction module 523, A coil temperature detection extraction module 532 and an eddy current detection signal module 533.

The heating time calculation module 522 further includes an automatic heating time adjustment module 5221 for automatically calculating and adjusting the heating time after comparing the upper surface temperature of the metal surface coating during each refresh detection, and a manual heating time setting module 5222 for facilitating the user to manually adjust the heating time.

Further, as shown in the circuit diagram in fig. 5, the circuit device 6 of the present invention includes a power source 61, an eddy current heating power source generator 62, an excitation alternating signal generator 63, a changeover switch 64, an eddy current coil circuit section 65, and a test data processing center 66. In which an eddy current coil heating circuit 651, a temperature signal detection circuit 652, and a lift-off value detection circuit 653 in the eddy current coil circuit section 65.

The above is one embodiment of the present invention. Furthermore, it is to be understood that all equivalent or simple changes in the structure, features and principles described in the present patent concepts are included in the scope of the present patent.