CN114594126A

CN114594126A - Metal part thermoelectric potential detection device

Info

Publication number: CN114594126A
Application number: CN202111622845.0A
Authority: CN
Inventors: 肖青山; 陈银强; 曾咏奎; 王仪美; 肖调兵; 桂春
Original assignee: China Nuclear Power Operation Technology Corp Ltd
Current assignee: China Nuclear Power Operation Technology Corp Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-07

Abstract

The invention relates to a metal part thermoelectric potential detection device, which comprises a thermoelectric potential measurement unit (18), a power supply device (23) and a metal part fixing device (33); the metal part fixing device (33) is fixed on a metal part (35) to be detected; the input end of the power supply device (23) is an external power supply, and the output end of the power supply device (23) is connected with the thermoelectric potential measuring unit (18). The metal part thermoelectric potential detection device enables the measurement of the thermoelectric potential of the metal part to be more accurate and reliable.

Description

Metal part thermoelectric potential detection device

Technical Field

The invention relates to the technical field of nondestructive testing of metal parts, in particular to a thermoelectric potential testing device for a metal part.

Background

When there is a temperature difference Δ T between the two ends of the sample or part, an asymmetric distribution of system electrons is caused due to non-uniformity of temperature, a potential difference Δ V is generated between the two ends of the sample or part, and the ratio of the potential difference Δ V to the potential difference Δ V between the two ends of the sample or part due to the temperature difference Δ T is called thermoelectric potential, also called Seebeck coefficient or Seebeck coefficient. The Seebeck coefficient is a physical quantity related only to the material properties, independent of the geometry, defined as: and S is delta V/delta T. Metal parts such as nuclear grade main pipelines and the like are key equipment for guaranteeing the safe operation of nuclear reactors, the aging and degradation phenomena of widely used nuclear grade cast stainless steel in high-temperature environments are very common, and the metal parts are key problems for restricting the service life of nuclear facilities to be prolonged and even the safe operation. There is an urgent need in the industry to develop accurate and efficient diagnostic evaluation techniques to identify aging phenomena of materials in time so that power plants take targeted measures to mitigate the aging effects of materials.

The cast stainless steel can generate thermal aging embrittlement after being in service for a long time in a reactor high-temperature operation environment of 280-320 ℃, so that the stainless steel material becomes brittle, the tensile strength of the stainless steel is increased, and the toughness, the impact energy and the fracture toughness are reduced. The method comprises the steps of measuring the thermoelectric potential and the mechanical property of a metal part material after thermal aging in a laboratory, obtaining the rule between the thermoelectric potential and the mechanical property under different thermal aging time, then reversely pushing the mechanical property of the metal part by measuring the thermoelectric potential of the metal part under the service state, and realizing the field nondestructive detection of the thermal aging state of the metal part in the nuclear power plant, thereby making more reasonable evaluation on the thermal aging state of the metal part, preventing the metal part from brittle failure, and providing a basis for part maintenance or replacement and license renewal application in prolonging the service life.

At present, relevant colleges and scientific research institutions in France and China develop thermoelectric potential detectors or detection devices for carrying out on-site thermoelectric potential measurement on large metal parts, the basic principle of the detectors or detection devices is a two-point method, namely two probes are adopted for measurement on the surfaces of the metal parts, and contact thermal resistance is caused by heat transfer from a hot-end probe to the metal parts in the process of measuring the thermoelectric potential by the two-point method, so that the measurement result of the thermoelectric potential is inaccurate.

Disclosure of Invention

Based on this, it is necessary to provide a metal component thermoelectric potential detection device aiming at the problem that the measurement result of the existing metal component thermoelectric potential detection device is inaccurate, the device adopts three probe forms to measure the thermoelectric potential on the surface of the metal component, one single hot-end probe is not used for measuring the thermoelectric potential, and two cold-end probes are specially used for measuring the temperature difference and the voltage difference, so that the measurement of the thermoelectric potential of the metal component is more accurate and reliable.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention relates to a metal part thermoelectric potential detection device, which comprises a thermoelectric potential measurement unit, a power supply device and a metal part fixing device; the metal part fixing device is fixed on the metal part to be detected; the input end of the power supply device is an external power supply, and the output end of the power supply device is connected with the thermoelectric potential measuring unit.

The working principle is as follows: when the thermoelectric potential measuring device is used, the metal part fixing device is fixed on a metal part to be measured and used for keeping the thermoelectric potential measuring unit in place for measurement; the power supply device is connected with an external power supply and provides a power supply for the thermoelectric potential measuring unit; the thermoelectric force measuring unit is contacted with the metal component to be measured, and measures thermoelectric force data of the metal component to be measured.

Further, the power supply device is connected with an external power supply through a power line and a power socket.

Furthermore, the thermoelectric potential measuring unit comprises a hot end probe measuring unit, a cold end probe measuring unit and a signal acquisition and control station; the signal acquisition and control station is respectively in communication connection with the hot end probe measuring unit and the cold end probe measuring unit, acquires data measured by the hot end probe measuring unit and the cold end probe measuring unit and controls the hot end probe measuring unit and the cold end probe measuring unit; the power supply device is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station through cables, and provides power for the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station.

Furthermore, the power supply device is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station through cables; the power supply device connects an external power supply to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station through cables, and provides power for the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station.

Furthermore, the hot end probe measuring unit comprises a hot end probe, an X-axis moving device, a Z-axis moving device, a heating unit and a protective shell; the Z-axis moving device and the heating unit are arranged in the protective shell, the upper end of the heating unit is connected with the Z-axis moving device, the lower end of the heating unit is connected with the upper end of the hot end probe, and the lower end of the hot end probe is exposed out of the protective shell; the upper part of the protective shell is connected with an X-axis moving device.

Furthermore, the X-axis moving device comprises an X-axis lead screw, an X-axis electric sliding table and an X-axis direct current motor, and the upper part of the protective shell is sequentially connected with the X-axis lead screw, the X-axis electric sliding table and the X-axis direct current motor; the signal acquisition and control station is in communication connection with the X-axis direct current motor and controls the X-axis direct current motor; the power supply device is connected with the X-axis direct current motor through a cable; the power supply device connects an external power supply to the X-axis direct current motor through a cable to provide power for the X-axis direct current motor.

Furthermore, the Z-axis moving device comprises a Z-axis lead screw, a pressure sensor, a Z-axis electric sliding table and a Z-axis direct current motor, and the upper end of the heating unit is sequentially connected with the Z-axis lead screw, the pressure sensor, the Z-axis electric sliding table and the Z-axis direct current motor; the signal acquisition and control station is respectively in communication connection with the Z-axis direct current motor, the pressure sensor and the heating unit, acquires the pressure measured by the pressure sensor and controls the Z-axis direct current motor, the pressure sensor and the heating unit; the power supply device is respectively connected with the heating unit and the Z-axis direct current motor through cables; the power supply device connects an external power supply to the heating unit and the Z-axis direct current motor through cables to supply power to the heating unit and the Z-axis direct current motor.

Furthermore, the hot end probe comprises a cylinder, a copper probe and a platinum probe, the upper end of the cylinder is connected with the lower end of the heating unit, and the lower end of the cylinder is exposed out of the protective shell; the copper probe is embedded in the lower end of the cylinder, and the platinum probe is embedded in the copper probe and used for measuring the temperature of the metal part; the signal acquisition and control station is respectively in communication connection with the copper probe and the platinum probe of the hot-end probe, and the signal acquisition and control station acquires the temperature measured by the platinum probe of the hot-end probe.

Furthermore, the cold end probe measuring unit comprises a first cold end probe measuring unit, a second cold end unit measuring unit and a unit box body; the first cold end probe measuring unit comprises a first cold end probe, and the second cold end unit measuring unit comprises a second cold end probe; the X-axis electric sliding table and the X-axis direct current motor are arranged in the unit box body, the right end of the X-axis screw rod is connected with the X-axis electric sliding table, and the left end of the X-axis screw rod penetrates through the unit box body to be connected with the upper part of the protective shell; and the first cold end probe of the first cold end probe measuring unit and the second cold end probe of the second cold end unit measuring unit are exposed out of the unit box body.

Further, the first cold-end probe measuring unit further comprises a first guide rod and a first cold-end probe manual lock; the upper end of the first cold-end probe is connected with the lower end of a first guide rod, the upper end of the first guide rod is connected with a manual lock of the first cold-end probe, the first cold-end probe moves along the Z-axis direction through the first guide rod, and the lower end of the first cold-end probe is exposed out of the unit box body and is in position fixation through the manual lock of the first cold-end probe after being contacted with a metal part.

Furthermore, the second cold-end probe measuring unit further comprises a second guide rod, a second polymer carrier and a second cold-end probe manual lock, the upper end of the second cold-end probe is connected with the lower end of the second guide rod, the upper end of the second guide rod is connected with the second cold-end probe manual lock, the second cold-end probe moves along the Z-axis direction through the second guide rod, and the lower end of the second cold-end probe is exposed out of the unit box body and is in contact with the metal part and then is fixed in position through the second cold-end probe manual lock.

Further, the first cold side probe comprises a copper probe, a first polymer carrier, a thermocouple and a copper wire; the upper end of the first polymer carrier is connected with the lower end of the first guide rod, and the lower end of the first polymer carrier is exposed out of the unit box body; the copper probe is embedded in the first polymer carrier, and the thermocouple and the copper wire are embedded in the copper probe; the thermocouple is used for measuring different temperature differences of the metal parts, and the copper wire is used for measuring different voltage differences of the metal parts; the signal acquisition and control station is respectively in communication connection with the thermocouple and the copper wire of the first cold-end probe, and acquires temperature difference measured by the thermocouple of the first cold-end probe and voltage difference signals measured by the copper wire of the first cold-end probe.

Further, the second cold side probe comprises a copper probe, a second polymer carrier, a thermocouple and a copper wire; the upper end of the second polymer carrier is connected with the lower end of the second guide rod, and the lower end of the second polymer carrier is exposed out of the unit box body; the copper probe is embedded in the second polymer carrier, and the thermocouple and the copper wire are embedded in the copper probe; the thermocouple is used for measuring different temperature differences of the metal parts, and the copper wire is used for measuring different voltage differences of the metal parts; and the signal acquisition and control station is respectively in communication connection with the thermocouple and the copper wire of the second cold-end probe and acquires the temperature difference measured by the thermocouple of the second cold-end probe and the voltage difference signal measured by the copper wire of the second cold-end probe.

Further, the unit box body is an aluminum alloy shell; and a lifting handle is arranged at the top of the unit box body.

Further, power supply unit includes the power supply box, the power supply box is aluminum alloy closed shell, be equipped with emergency stop button on the power supply box, power supply box is inside not to have the ventilation fan.

Further, metal part fixing device includes base, bandage and cushion, the bandage twines on metal part, the tip of bandage is equipped with the buckle, the buckle is twisted on the base, four corners of base all set up the cushion, the cushion is connected with the metal part contact.

Furthermore, the metal part fixing device comprises a base, two binding bands and four cushion blocks, buckles of the two binding bands are symmetrically screwed on the base, and the cushion blocks are arranged on four corners of the base.

In one embodiment, the metal part thermoelectric potential detection device further comprises a terminal device, and the terminal device is connected with the power supply device.

In one embodiment, the terminal equipment is connected with the power supply device through a terminal equipment power line and a network cable; the power supply device provides power for the terminal equipment through a power line of the terminal equipment, and the power supply device outputs the acquisition signal and the control signal of the signal acquisition and control station to the terminal equipment through a network cable.

The invention has the beneficial technical effects that:

the metal part thermoelectric potential detection device adopts three probe forms to measure on the surface of the metal part, namely, a single hot end probe is introduced and only used for heating, the thermoelectric potential detection device is not used for thermoelectric potential measurement, the two remaining cold end probes are specially used for measuring temperature difference and voltage difference, most of heat transmitted from the hot end probe is dissipated through the metal part, only a small part of heat is transmitted to the two cold end probes, and the temperature difference between the metal part and the cold end probes is greatly reduced due to the fact that the heat entering the cold end probes is little, so that the contact thermal resistance between the cold end probes and the surface of the metal part is reduced, and the measurement of the thermoelectric potential is more accurate and reliable.

According to the metal part thermoelectromotive force detection device, the first cold-end probe and the second cold-end probe are moved and controlled manually and move along the Z axis in the vertical direction through the guide rod, the position is fixed by using the manual lock, and a heating unit, a pressure sensor, a horizontal X-axis lead screw and a motor, an X-axis electric sliding table, a vertical Z-axis lead screw and a motor and a Z-axis electric sliding table are omitted, so that the two sets of pressure sensors, the lead screw, the motor and the electric sliding table are reduced, the structural weight is light, the portability is improved, and the failure probability is reduced.

Drawings

FIG. 1 is a schematic diagram of a thermoelectric force detection device for metal parts according to the present invention;

FIG. 2 is a schematic structural diagram of a thermoelectric potential detection device for metal parts according to the present invention.

In the figure, 1, a hot-end probe; 2. a first cold end probe; 3. a second cold end probe; 4. a first guide bar; 5. A first polymeric support; 6. a second guide bar; 7. a second polymeric support; 8. a heating unit; 9. a Z-axis lead screw; 10. a pressure sensor; 11. a Z-axis electric sliding table; 12. a Z-axis direct current motor; 13. a protective shell; 14. An X-axis lead screw; 15. a handle; 16. an X-axis electric sliding table; 17. an X-axis DC motor; 18. a thermoelectric potential measuring unit; 19. a unit box body; 20. a terminal device; 21. a terminal device power line; 22. a network cable; 23. a power supply device; 24. an emergency stop button; 25. a power line; 26 an electrical outlet; 27. a cable; 28. a signal acquisition and control station; 29. a first cold-end probe manual lock; 30. a second cold-end probe manual lock; 31. a base; 32. a cushion block; 33. a metal part fixing device; 34. binding bands; 35. a metal pipeline.

Detailed Description

In the description of the present invention, it is to be understood that the terms "left end", "right end", "above", "below", "outside", "inside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

Referring to fig. 1, the metal component thermoelectric potential detection device of the present invention adopts three probe forms to perform measurement on the surface of a metal component, a single hot-end probe 1 is introduced, the end probe 1 is not used for measuring thermoelectric potential, and two cold-end probes are left and are specially used for measuring temperature difference and voltage difference.

The metal part thermoelectric potential detection device comprises a thermoelectric potential measuring unit 18, a power supply device 23 and a metal part fixing device 33; the metal part fixing device 33 is fixed on a metal part 35 to be measured; the input end of the power supply device 23 is an external power supply, and the output end of the power supply device 23 is connected with the thermoelectric potential measuring unit 18.

The working principle is as follows: when in use, the metal part fixing device 33 is fixed on the metal part 35 to be measured and used for keeping the thermoelectric potential measuring unit 18 in place for measurement; the power supply device 23 is connected with an external power supply, and the power supply device 23 provides power for the thermoelectric potential measuring unit 18; the thermoelectric-potential measuring unit 18 is in contact with the metal part to be measured, and measures thermoelectric-potential data of the metal part to be measured.

Further, the power supply device 23 is connected to an external power supply through a power cord 25 and a power outlet 26.

Further, the metal component thermoelectric potential detection device further comprises a terminal device 20, and the terminal device 20 is connected with a power supply device 23. The thermoelectric-voltage measuring unit 18 is connected to the terminal 20 via a power supply device 23.

Further, the terminal device 20 is connected to a power supply apparatus 23 via a terminal device power supply line 21 and a network line 22. The power supply device 23 supplies power to the terminal device 20 through the terminal device power line 21, and the power supply device 23 outputs the acquisition signal and the control signal of the signal acquisition and control station 28 to the terminal device 20 through the network cable 22.

Further, the thermoelectric potential measuring unit 18 includes a hot end probe measuring unit, a cold end probe measuring unit, and a signal acquisition and control station 28; the signal acquisition and control station 28 is respectively in communication connection with the hot end probe measuring unit and the cold end probe measuring unit, and the signal acquisition and control station 28 acquires data measured by the hot end probe measuring unit and the cold end probe measuring unit and controls the hot end probe measuring unit and the cold end probe measuring unit; the power supply device 23 is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 28 through cables, and the power supply device 23 provides power for the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 28.

Further, the power supply device 23 is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 28 through cables 27; the power supply device 23 connects an external power supply to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 28 through a cable 27, and supplies power to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 28.

Meanwhile, the power supply device 23 transmits the acquisition signal and the control signal of the signal acquisition and control station 28 through the cable 27, and outputs the acquisition signal and the control signal of the signal acquisition and control station 28 to the terminal device 20 through the network cable 22.

Further, the hot end probe measuring unit comprises a hot end probe 1, an X-axis moving device, a Z-axis moving device, a heating unit 8 and a protective shell 13; the Z-axis moving device and the heating unit 8 are arranged in a protective shell 13, the upper end of the heating unit 8 is connected with the Z-axis moving device, the lower end of the heating unit 8 is connected with the upper end of the hot end probe 1, and the lower end of the hot end probe 1 is exposed out of the protective shell 13; the upper part of the protective shell 13 is connected with an X-axis moving device. The X-axis moving device drives the hot end probe 1 to move along the X-axis direction, the Z-axis moving device drives the hot end probe 1 to move along the Z-axis direction, and the whole hot end probe 1 can move along the Z-axis direction and the X-axis direction.

Further, the X-axis moving device comprises an X-axis lead screw 14, an X-axis electric sliding table 16 and an X-axis direct current motor 17, wherein the X-axis lead screw 14, the X-axis electric sliding table 16 and the X-axis direct current motor 17 are sequentially connected to the upper portion of the protective shell 13. The X-axis moving device drives the hot end probe 1 to move along the X-axis direction.

Furthermore, the Z-axis moving device comprises a Z-axis lead screw 9, a pressure sensor 10, a Z-axis electric sliding table 11 and a Z-axis direct current motor 12, wherein the upper end of the heating unit 8 is sequentially connected with the Z-axis lead screw 9, the pressure sensor 10, the Z-axis electric sliding table 11 and the Z-axis direct current motor 12. The Z-axis moving device drives the hot end probe 1 to move along the Z-axis direction.

Further, the hot end probe 1 comprises a cylinder, a copper probe and a platinum probe, the upper end of the cylinder is connected with the lower end of the heating unit 8, and the lower end of the cylinder is exposed out of the protective shell 13; the copper probe is embedded in the lower end of the cylinder, and the platinum probe is embedded in the copper probe and used for measuring the temperature of the metal part.

Further, the cold end probe measuring unit comprises a first cold end probe measuring unit, a second cold end unit measuring unit and a unit box body 19; the first cold end probe measuring unit comprises a first cold end probe 2, and the second cold end unit measuring unit comprises a second cold end probe 3; the X-axis electric sliding table 16 and the X-axis direct current motor 17 are arranged in the unit box body 19, the right end of the X-axis screw rod 14 is connected with the X-axis electric sliding table 16, and the left end of the X-axis screw rod 14 penetrates through the unit box body 19 to be connected with the upper part of the protective shell 13; and the first cold-end probe 2 of the first cold-end probe measuring unit and the second cold-end probe 3 of the second cold-end unit measuring unit are exposed out of the unit box body 19.

Further, the first cold-end probe measuring unit further comprises a first guide rod 4 and a first cold-end probe manual lock 29; the upper end of the first cold-end probe 2 is connected with the lower end of a first guide rod 4, the upper end of the first guide rod 4 is connected with a first cold-end probe manual lock 29, the first cold-end probe 2 moves along the Z-axis direction through the first guide rod 4, and the lower end of the first cold-end probe 2 is exposed out of the unit box 19 and is fixed in position through the first cold-end probe manual lock 29 after being contacted with a metal part.

Further, the second cold-end probe measuring unit further comprises a second guide rod 6, a second polymer carrier 7 and a second cold-end probe manual lock 30, the upper end of the second cold-end probe 2 is connected with the lower end of the second guide rod 6, the upper end of the second guide rod 6 is connected with the second cold-end probe manual lock 30, the second cold-end probe 3 moves along the Z-axis direction through the second guide rod 6, and the lower end of the second cold-end probe 3 is exposed out of the unit box 19 and is in contact with a metal part and then is fixed in position through the second cold-end probe manual lock 30.

Further, the first cold-side probe 2 comprises a copper probe, a first polymer carrier 5, a thermocouple and a copper wire; the upper end of the first polymer carrier 5 is connected with the lower end of the first guide rod 4, and the lower end of the first polymer carrier 5 is exposed out of the unit box body 19; the copper probe is embedded inside a first polymer carrier 5, and the thermocouple and the copper wire are embedded inside the copper probe; the thermocouples are used for measuring different temperature differences of the metal parts, and the copper wires are used for measuring different voltage differences of the metal parts.

Further, the second cold end probe 3 comprises a copper probe, a second polymer carrier 7, a thermocouple and a copper wire; the upper end of the second polymer carrier 7 is connected with the lower end of the second guide rod 6, and the lower end of the second polymer carrier 7 is exposed out of the unit box 19; the copper probe is embedded inside the second polymer carrier 7, and the thermocouple and the copper wire are embedded inside the copper probe; the thermocouples are used for measuring different temperature differences of the metal parts, and the copper wires are used for measuring different voltage differences of the metal parts.

Further, the signal acquisition and control station 28 is respectively in communication connection with the X-axis direct current motor 17, the Z-axis direct current motor 12, the pressure sensor 10, the heating unit 8, and the copper probe and the platinum probe of the hot-end probe 1, and the signal acquisition and control station 28 acquires the temperature measured by the platinum probe of the hot-end probe 1 and the pressure measured by the pressure sensor 10, and controls the X-axis direct current motor 17, the Z-axis direct current motor 12, the pressure sensor 10, and the heating unit 8; the power supply device 23 is respectively connected with the heating unit 8, the X-axis direct current motor 17, the Z-axis direct current motor 12 and the signal acquisition and control station 28 through cables 27; the power supply device 23 connects an external power supply to the heating unit 8, the X-axis dc motor 17, the Z-axis dc motor 12 and the signal acquisition and control station 28 through a cable 27, and supplies power to the heating unit 8, the X-axis dc motor 17, the Z-axis dc motor 12 and the signal acquisition and control station 28.

Further, the signal acquisition and control station 28 is respectively in communication connection with the thermocouple and the copper wire of the first cold-end probe 2, and acquires a temperature difference measured by the thermocouple of the first cold-end probe 2 and a voltage difference signal measured by the copper wire of the first cold-end probe 2; the signal acquisition and control station 28 is respectively in communication connection with the thermocouple of the second cold-end probe 3 and the copper wire, and acquires a temperature difference measured by the thermocouple of the second cold-end probe 3 and a voltage difference signal measured by the copper wire of the second cold-end probe 3.

Further, the unit box 19 is an aluminum alloy shell; the top of the unit box 19 is provided with a handle 15 for moving the thermoelectric force measuring unit 18.

Further, power supply unit 23 includes the power supply box, the power supply box is aluminum alloy closed shell, be equipped with emergency stop button on the power supply box, power supply box is inside not to have the ventilating fan in order to prevent that the dust from getting into.

Further, the metal part fixing device 33 comprises a base 31, a strap 34 and a cushion block 32, the strap 32 is wound on the metal part, a buckle is arranged at the end of the strap 32, the buckle is screwed on the base 31, the cushion block 32 is arranged at each of four corners of the base 31, and the cushion block 32 is in contact connection with the metal part.

Further, the metal part fixing device 33 includes a base 31, two straps 34, and four spacers 32, wherein the buckles of the two straps 32 are symmetrically screwed on the base 32, and one spacer 32 is disposed at each of four corners of the base 31.

The method for detecting the thermoelectric force of the metal component by using the thermoelectric force detection device of the metal component comprises the following steps:

step A, preparing for thermoelectric force measurement of a metal part;

A1. performing field exploration on the metal component 35 to be subjected to thermoelectric force measurement on the field, checking whether the working space under the field environment is enough, and confirming whether the metal component thermoelectric force detection device has installation conditions;

A2. after confirming that the field metal part thermoelectric potential detection device has installation conditions, selecting a measurement area on the surface of the metal part 35 to be measured, removing an oxidation layer and a rust layer on the surface of the field metal part, grinding and polishing, wherein the length of the polishing area is more than or equal to 100mm, the width of the polishing area is more than or equal to 30mm, and the surface roughness Ra of the polished area is less than or equal to 5 mu m;

b, installing a metal part thermoelectric potential detection device on site;

B1. firstly, a metal part fixing device 33 of a metal part thermoelectric potential detection device is installed, and a base 31 of the metal part fixing device is firmly fixed on a metal part 35 to be detected and used for keeping a thermoelectric potential measurement unit 18 in place for measurement; the metal part fixing device 33 comprises a base 31, two binding bands 34 and four cushion blocks 32, wherein the two binding bands 32 are wound on the metal part 35, buckles of the two binding bands 32 are symmetrically screwed on the base 32, the cushion blocks 32 are arranged at four corners of the base 31, and after the metal part thermoelectric potential detection device is tightly bound by the binding bands 34, the base 31 is ensured to be fixed on the metal part 35 to be detected;

B2. during installation, the hot-end probe 1, the first cold-end probe 2 and the second cold-end probe 3 are ensured to be positioned at the middle position of a polishing area, the first cold-end probe 2 is manually moved and controlled, the guide rod 4 moves along the Z axis in the vertical direction, and the position of the lower part of the first cold-end probe 2 is fixed through the first cold-end probe manual lock 29 after contacting with the metal part 35; then, the second cold-end probe 3 is moved and controlled manually, the second cold-end probe moves along the Z axis in the vertical direction through the guide rod 6, and the position of the lower part of the second cold-end probe 3 is fixed through the second cold-end probe manual lock 30 after the lower part of the second cold-end probe contacts with the metal part 35;

B3. after the metal member thermoelectric force detection device is mounted on the metal member 35, the cable 27 of the power supply device 23, the terminal device power supply line 21, the network cable 22, the power supply line 25, and the power outlet 26 are connected. An external power supply of 220V/50Hz is connected to the thermal potential measuring unit 18 through a cable 27, and 24V voltage is output to the heating unit 8, the X-axis direct current motor 17, the Z-axis direct current motor 12 and the signal acquisition and control station 28 of the hot-end probe 1, wherein the maximum length of the cable 27 is not less than 20 meters; while the power supply device 23 is connected to the terminal device 20 through the terminal device power supply line 21, and the collected signal and the control signal are output to the thermoelectric force detection software of the pen terminal device 20 through the network line 22. Finally, an external power supply of 220V is connected to the power supply device 23 through a power line 25 and a power socket 26;

B4. after the metal part thermoelectric potential detection device is installed on site, a switch of a power supply device 23 is turned on, the terminal device 20 is turned on after power is on, and if the circuit is installed incorrectly, an emergency stop button 24 on the power supply device is pressed;

step C, measuring the thermoelectric potential detection device of the metal part;

the method comprises the following steps:

C1. the hot side probe 1 is heated. The temperature of the hot end probe 1 is heated to a target temperature;

C2. the hot end probe 1 begins to descend and is in contact with the surface of the metal part 35 to be detected, the pressure is kept to be 30N-40N through the pressure sensor 10, and the whole hot end probe 1 can move along the Z axis in the vertical direction and the X axis in the horizontal direction;

C3. and (4) signal acquisition and control. Most of heat transmitted from the hot-end probe 1 is dissipated through the metal part 35, only a small part of heat is transmitted to the first cold-end probe 2 and the second cold-end probe 3, and the heat entering the first cold-end probe 2 and the second cold-end probe 3 is little, so that the temperature difference between the metal part 35 and the first cold-end probe 2 and the second cold-end probe 3 is greatly reduced, and the thermal contact resistance between the first cold-end probe 2 and the surface of the second cold-end probe 3 and the surface of the metal part 35 is reduced. The first cold-end probe 2 and the second cold-end probe 3 form a measuring loop, the hot-end probe 1, the first cold-end probe 2 and the second cold-end probe 3 are connected by the signal acquisition and control station 28 through thermoelectric potential detection software on the power supply device 23 and the terminal device 20, the temperature measured by the platinum probe, the pressure measured by the pressure sensor 10, the temperature difference measured by the thermocouple and the voltage difference signal measured by the copper wire are acquired, and the X-axis direct current motor 17, the Z-axis direct current motor 12, the pressure sensor 10 and the heating unit 8 are controlled.

C4. The hot side probe 1 is raised. After the signal acquisition of the previous measuring point is finished, the hot-end probe 1 automatically rises to an initial vertical position along the Z axis in the vertical direction;

C5. the hot end probe 1 moves to the next measuring point for measurement, firstly moves to the next measuring point position along the X axis in the horizontal direction according to the distance between the measuring points, then descends to the measuring point position along the Z axis in the vertical direction, contacts with the surface of the metal part 35 to be measured, and keeps the pressure of 30N-40N through the pressure sensor 10; according to the number of the measuring points and the collecting frequency of the measuring points, the hot-end probe 1 carries out repeated movement and measurement, and the signal collecting and controlling station 28 carries out corresponding signal collection and control; the protective shell 13 of the hot end probe 1 is fixed on the Z-axis electric sliding table 11, is used for wrapping and protecting the hot end probe 1 and a connecting line thereof, and can move along the X axis in the horizontal direction along with the hot end probe 1;

C6. the hot side probe 1 returns to the original position. After all the measurement points are measured and signals are collected, the hot-end probe 1 automatically rises to an initial vertical position along a vertical Z axis and then moves to an initial horizontal position along a horizontal X axis, and meanwhile, the heating unit 8 of the hot-end probe 1 stops heating;

and D, disassembling the metal part thermoelectric potential detection device on site.

After the thermoelectric potential measurement of the metal part 35 to be measured is completed, the metal part thermoelectric potential detection device is assembled and disassembled on site according to the following steps:

D1. turning off the terminal device 20;

D2. turning off the switch of the power supply device 23, and then unplugging the power socket 26;

D3. pulling out the cable 27 connected with the power supply device 23, the terminal equipment power line 21 and the network cable 22;

D4. firstly, loosening the first cold-end probe 2 through the first cold-end probe manual lock 29, then carrying out manual movement and control, moving along the Z axis in the vertical direction through the first guide rod 4, and screwing the first cold-end probe manual lock 29 after the lower part of the first cold-end probe 2 is separated from contact with the metal part 35; then the second cold-end probe 3 is loosened through the second cold-end probe manual lock 30, then manual movement and control are carried out, and the second guide rod 6 moves along the Z axis in the vertical direction, so that the lower part of the second cold-end probe 3 is separated from the metal part 35 and then the second cold-end probe manual lock 30 is screwed down;

D5. removing a metal part fixing device 33 of the metal part thermoelectric potential detection device, holding the thermoelectric potential measurement unit 18 by one person through a handle 15, and removing the metal part thermoelectric potential detection device from a metal part 35 by the other person loosening a binding belt 34;

D6. the thermoelectric potential measuring unit 18, the power supply device 23, the metal part fixing device 33, the terminal equipment 20, the cable 27, the power line 25, the terminal equipment power line 21, the network cable 22 and other auxiliary tools are arranged in a storage box, and the inspector and the metal part thermoelectric potential detecting device are removed from the site, so that the thermoelectric potential detecting work of the metal part 35 on the site is completed.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A metal part thermoelectric potential detection device is characterized by comprising a thermoelectric potential measurement unit (18), a power supply device 23 and a metal part fixing device (33); the metal part fixing device (33) is fixed on a metal part (35) to be detected; the input end of the power supply device (23) is an external power supply, and the output end of the power supply device (23) is connected with the thermoelectric potential measuring unit (18).

2. The metal part thermoelectric voltage detection device according to claim 1, characterized in that said power supply means (23) is connected to an external power supply through a power cord (25) and an electric outlet (26).

3. The metal part thermoelectric potential detection device according to claim 1, further comprising a terminal device (20); the terminal device (20) is connected to a power supply device (23).

4. The metal part thermoelectric potential detection device according to claim 3, wherein the terminal equipment (20) is connected with a power supply device (23) through a terminal equipment power line (21) and a network cable (22); the power supply device (23) supplies power to the terminal equipment (20) through a terminal equipment power line (21), and the power supply device (23) outputs the acquisition signal and the control signal of the signal acquisition and control station (28) to the terminal equipment (20) through a network cable (22).

5. The metal component thermoelectric potential detection device according to any one of claims 1 to 4, characterized in that said thermoelectric potential measurement unit (18) comprises a hot-end probe measurement unit, a cold-end probe measurement unit, and a signal acquisition and control station (28); the signal acquisition and control station (28) is respectively in communication connection with the hot end probe measuring unit and the cold end probe measuring unit, and the signal acquisition and control station (28) acquires data measured by the hot end probe measuring unit and the cold end probe measuring unit and controls the hot end probe measuring unit and the cold end probe measuring unit; the power supply device (23) is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (28) through cables, and the power supply device (23) provides power for the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (28).

6. The metal component thermoelectric potential detection device according to claim 5, characterized in that said power supply device (23) is connected with a hot end probe measuring unit, a cold end probe measuring unit and a signal acquisition and control station (28) through cables (27), respectively; and the power supply device (23) is used for connecting an external power supply to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (28) through a cable (27) and supplying power to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (28).

7. The metal part thermoelectric potential detection device according to claim 5, wherein the hot-end probe measurement unit comprises a hot-end probe (1), an X-axis moving device, a Z-axis moving device, a heating unit (8), and a protective case (13); the Z-axis moving device and the heating unit (8) are arranged in a protective shell (13), the upper end of the heating unit (8) is connected with the Z-axis moving device, the lower end of the heating unit (8) is connected with the upper end of the hot end probe (1), and the lower end of the hot end probe (1) is exposed out of the protective shell (13); the upper part of the protective shell (13) is connected with an X-axis moving device.

8. The metal part thermoelectric potential detection device according to claim 7, wherein the X-axis moving device comprises an X-axis lead screw (14), an X-axis electric sliding table (16) and an X-axis direct current motor (17), and the X-axis lead screw (14), the X-axis electric sliding table (16) and the X-axis direct current motor (17) are sequentially connected to the upper part of the protective shell (13); the signal acquisition and control station (28) is in communication connection with the X-axis direct current motor (17), and the signal acquisition and control station (28) controls the X-axis direct current motor (17); the power supply device (23) is connected with the X-axis direct current motor (17) through a cable; the power supply device (23) connects an external power supply to the X-axis direct current motor (17) through a cable to supply power to the X-axis direct current motor (17).

9. The metal part thermoelectric potential detection device according to claim 7, wherein the Z-axis moving device comprises a Z-axis lead screw (9), a pressure sensor (10), a Z-axis electric sliding table (11) and a Z-axis direct current motor (12), and the upper end of the heating unit (8) is sequentially connected with the Z-axis lead screw (9), the pressure sensor (10), the Z-axis electric sliding table (11) and the Z-axis direct current motor (12); the signal acquisition and control station (28) is respectively in communication connection with the Z-axis direct current motor (12), the pressure sensor (10) and the heating unit (8), and the signal acquisition and control station (28) acquires the pressure measured by the pressure sensor (10) and controls the Z-axis direct current motor (12), the pressure sensor (10) and the heating unit (8); the power supply device (23) is respectively connected with the heating unit (8) and the Z-axis direct current motor (12) through cables; the power supply device (23) connects an external power supply to the heating unit (8) and the Z-axis direct current motor (12) through cables, and supplies power to the heating unit (8) and the Z-axis direct current motor (12).

10. The metal part thermoelectric potential detection device according to claim 7, wherein the hot end probe (1) comprises a cylinder, a copper probe and a platinum probe, the upper end of the cylinder is connected with the lower end of the heating unit (8), and the lower end of the cylinder is exposed out of the protective shell (13); the copper probe is embedded in the lower end of the cylinder, and the platinum probe is embedded in the copper probe and used for measuring the temperature of the metal part (35); the signal acquisition and control station (28) is respectively in communication connection with the copper probe and the platinum probe of the hot-end probe (1), and the signal acquisition and control station (28) acquires the temperature measured by the platinum probe of the hot-end probe (1).

11. The metal component thermoelectric potential detection device according to claim 8, wherein the cold-end probe measurement unit comprises a first cold-end probe measurement unit, a second cold-end unit measurement unit and a unit box (19); the first cold end probe measuring unit comprises a first cold end probe (2), and the second cold end unit measuring unit comprises a second cold end probe (3); the X-axis electric sliding table (16) and the X-axis direct current motor (17) are arranged in the unit box body (19), the right end of the X-axis screw rod (14) is connected with the X-axis electric sliding table (16), and the left end of the X-axis screw rod (14) penetrates through the unit box body (19) to be connected with the upper part of the protective shell (13); and a first cold end probe (2) of the first cold end probe measuring unit and a second cold end probe (3) of the second cold end probe measuring unit are exposed out of the unit box body (19).

12. The metal component thermoelectric potential detection device of claim 11, wherein the first cold-end probe measurement unit further comprises a first stem (4) and a first cold-end probe manual lock (29); the device is characterized in that the upper end of the first cold-end probe (2) is connected with the lower end of the first guide rod (4), the upper end of the first guide rod (4) is connected with the manual lock (29) of the first cold-end probe, the first cold-end probe (2) moves along the Z-axis direction through the first guide rod (4), and the lower end of the first cold-end probe (2) is exposed out of the unit box body (19) and is in contact with the metal part (35) and then is fixed in position through the manual lock (29) of the first cold-end probe.

13. The metal component thermoelectric potential detection device according to claim 11, wherein the second cold-end probe measurement unit further comprises a second guide rod (6), a second polymer carrier (7) and a second cold-end probe manual lock (30), the upper end of the second cold-end probe (2) is connected with the lower end of the second guide rod (6), the upper end of the second guide rod (6) is connected with the second cold-end probe manual lock (30), the second cold-end probe (3) moves along the Z-axis direction through the second guide rod (6), and the lower end of the second cold-end probe (3) is exposed out of the unit box body (19) and is in contact with the metal component (35) and then is fixed in position through the second cold-end probe manual lock (30).

14. The metal component thermoelectric detection device according to claim 11, characterized in that said first cold end probe (2) comprises a copper probe, a first polymer carrier (5), a thermocouple and a copper wire; the upper end of the first polymer carrier (5) is connected with the lower end of the first guide rod (4), and the lower end of the first polymer carrier (5) is exposed out of the unit box body (19); the copper probe is embedded inside a first polymer carrier (5), and the thermocouple and the copper wire are embedded inside the copper probe; the thermocouples are used for measuring different temperature differences of the metal parts (35), and the copper wires are used for measuring different voltage differences of the metal parts (35); and the signal acquisition and control station (28) is respectively in communication connection with the thermocouple of the first cold-end probe (2) and the copper wire, and acquires the temperature difference measured by the thermocouple of the first cold-end probe (2) and the voltage difference signal measured by the copper wire of the first cold-end probe (2).

15. The metal component thermoelectric voltage detection device according to claim 11, characterized in that said second cold-end probe (3) comprises a copper probe, a second polymer carrier (7), a thermocouple and a copper wire; the upper end of the second polymer carrier (7) is connected with the lower end of the second guide rod (6), and the lower end of the second polymer carrier (7) is exposed out of the unit box body (19); the copper probe is embedded in a second polymer carrier (7), and the thermocouple and the copper wire are embedded in the copper probe; the thermocouples are used for measuring different temperature differences of the metal parts (35), and the copper wires are used for measuring different voltage differences of the metal parts (35); and the signal acquisition and control station (28) is respectively in communication connection with the thermocouple and the copper wire of the second cold-end probe (3) and acquires the temperature difference measured by the thermocouple of the second cold-end probe (3) and the voltage difference signal measured by the copper wire of the second cold-end probe (3).

16. The metal part thermoelectric potential detection device according to claim 11, wherein the unit case (19) is an aluminum alloy case; the top of the unit box body (19) is provided with a handle (15).

17. The metal part thermoelectrical potential detection device according to claim 1, wherein the power supply device (23) comprises a power supply box body, the power supply box body is an aluminum alloy closed shell, an emergency stop button is arranged on the power supply box body, and a ventilation fan is not arranged inside the power supply box body.

18. The metal component thermoelectric force detection device according to claim 1, wherein the metal component fixing device (33) comprises a base (31), a strap (34) and a cushion block (32), the strap (34) is wound on the metal component (35), a buckle is arranged at the end of the strap (34), the buckle is screwed on the base (31), the cushion block (32) is arranged at each of four corners of the base (31), and the cushion block (32) is in contact connection with the metal component (35).

19. The metal part thermoelectric voltage detection device according to claim 18, wherein said metal part fixing means (33) comprises a base (31), two straps (34) and four pads (32), the buckles of the two straps (34) are symmetrically screwed on the base (31), and one pad (32) is disposed at each of four corners of said base (31).