CN115728343A - Four-probe type metal part thermoelectric potential detection system - Google Patents

Abstract

The invention relates to the technical field of nondestructive testing of metal parts, in particular to a four-probe-type metal part thermoelectric potential testing system. The thermoelectric power generation device comprises a thermoelectric potential measuring 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 beneficial technical effects are as follows: by adopting the four probes to simultaneously carry out thermoelectric potential measurement on the surface of the metal part, the technology is insensitive to the surface condition of the metal part, the thermal contact resistance between the cold-end probe and the surface of the metal part is reduced, and the temperature difference between the two hot-end probes is adjusted, so that the control of the temperature gradient between the two cold-end probes is more accurate, and the measurement precision of the thermoelectric potential of the metal part is improved.

Description

Metal part thermoelectric potential detection system in four-probe form

Technical Field

The invention relates to the technical field of nondestructive testing of metal parts, in particular to a four-probe-type metal part thermoelectric potential testing system.

Background

Cast austenitic stainless steel and cast duplex stainless steel have high strength and toughness, good corrosion resistance and welding performance, and are widely used as materials for components such as a primary side coolant main pipe, a main pump housing and the like in a pressurized water nuclear power Plant (PWR). Since cast austenitic stainless steel and cast duplex stainless steel have reduced toughness when they are used at temperatures of 290 to 325 ℃ for a long period of time, it is preferable to evaluate the degree of deterioration of the material of the metal member due to thermal aging by non-destructive or non-destructive inspection of the metal member in maintenance management of the equipment manufactured by using the above cast stainless steel material.

Currently, thermoelectric potential testing is found to be the most effective nondestructive testing method for detecting the material property change of the cast stainless steel caused by thermal aging. Therefore, the thermoelectric potential of the thermally aged cast stainless steel was measured by the thermoelectric method, and the relationship between the change in the mechanical properties such as hardness, tensile strength, and impact energy associated with thermal aging and the change in the thermoelectric potential was investigated. When a temperature difference Δ T exists between two ends of a metal component, a potential difference Δ V is generated between the two ends due to the Seebeck effect, and the ratio (Δ V/Δ T) of the two is called thermoelectric potential.

At present, relevant mechanisms in France, japan and China develop a metal part thermoelectric potential detection device in the form of two probes (two-point method) or three probes (three-point method), when two probes are used for measuring on the surface of a metal part, a hot end probe therein is used as a heating source and also used as an electrode for measuring voltage and temperature, and heat transfer from the hot end probe to the metal part can cause contact thermal resistance and introduce measurement errors; when three probes are used for measuring the surface of a metal part, the hot-end probe is generally used as a heating source independently and does not participate in the measurement process of voltage and temperature during calculation of thermoelectric force, but the requirement on control of the temperature gradient of the other two probes is higher.

Disclosure of Invention

The invention aims to provide a metal part thermoelectric potential detection system in a four-probe form, which can reduce the influence of the thermal contact resistance of probes and is convenient for controlling the temperature gradient between the probes, and a metal part thermoelectric potential detection system in a probe (in a four-point method form), wherein two heating probes are introduced beside two voltage and temperature measuring electrodes to respectively and independently provide heat sources, the system is insensitive to the surface condition of the metal part, and the control of the temperature gradient between the two measuring probes is more accurate.

In order to achieve the above purpose, the invention provides the following technical scheme: a four-probe type metal part thermoelectric potential detection system 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.

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

Further, the metal component thermoelectric potential detection device further comprises a terminal device; the terminal equipment is connected with the power supply device.

Further, 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.

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 first hot end probe measuring unit and a second hot end probe measuring unit, and the two hot end probe measuring units are fixed and installed in the measuring unit box body.

Furthermore, the first hot end probe measuring unit comprises a first hot end probe, an X-axis moving device, a first Z-axis moving device and a first heating unit; the Z-axis moving device and the first heating unit are arranged in the measuring unit box body, the upper end of the first heating unit is connected with the Z-axis moving device, the lower end of the first heating unit is connected with the upper end of the first hot-end probe, and the lower end of the first hot-end probe is exposed out of the measuring unit box body; and the upper part of the measuring unit box body 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 measuring unit box body is sequentially connected with the X-axis lead screw, the X-axis electric sliding table and the X-axis direct current motor; 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 is connected with the first Z-axis electric sliding table; 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 first Z-axis moving device comprises a first Z-axis lead screw, a first pressure sensor, a first Z-axis electric sliding table and a first Z-axis direct current motor, and the upper end of the first heating unit is sequentially connected with the first Z-axis lead screw, the first pressure sensor, the first Z-axis electric sliding table and the first Z-axis direct current motor; the signal acquisition and control station is respectively in communication connection with the first Z-axis direct current motor, the first pressure sensor and the first heating unit, acquires the pressure measured by the first pressure sensor and controls the first Z-axis direct current motor, the first pressure sensor and the first heating unit; the power supply device is respectively connected with the first heating unit and the first Z-axis direct current motor through cables; the power supply device connects an external power supply to the first heating unit and the first Z-axis direct current motor through a cable to provide power for the first heating unit and the first Z-axis direct current motor.

Furthermore, the first 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 first heating unit, and the lower end of the cylinder is exposed out of the measuring unit box body; 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 first hot-end probe, and the signal acquisition and control station acquires the temperature measured by the platinum probe of the first hot-end probe.

Further, the second hot end probe measuring unit comprises a second hot end probe, a second Z-axis moving device and a second heating unit; the second Z-axis moving device and the second heating unit are arranged in the measuring unit box body, the upper end of the second heating unit is connected with the second Z-axis moving device, the lower end of the second heating unit is connected with the upper end of the second hot-end probe, and the lower end of the second hot-end probe is exposed out of the measuring unit box body.

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

Further, the cold end probe measuring unit comprises a first cold end probe measuring unit and a second cold end probe measuring unit; 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; 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, a first polymer carrier 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 a 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 of the first cold-end probe and the copper wire, and acquires a temperature difference measured by the thermocouple of the first cold-end probe and a voltage difference signal measured by the copper wire of the first cold-end probe.

Further, the second cold-end 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 of the second cold-end probe and the copper wire, 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, the inside no ventilation fan of power supply box.

Further, the metal part fixing device comprises a first metal part fixing device and a second metal part fixing device, and the thermoelectric force measuring unit is fixed on the metal part through the first metal part fixing device and the second metal part fixing device.

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

Furthermore, the second metal part fixing device comprises a second base, a second cushion block and a second binding band, the second binding band is wound on the metal part, a buckle is arranged at the end of the second binding band, the buckle is screwed on the second base, the second cushion block is arranged on four corners of the second base, and the second cushion block is in contact connection with the metal part.

The invention has the beneficial technical effects that: the four-probe type metal part thermoelectric potential detection system provided by the invention adopts four probes to simultaneously measure thermoelectric potential on the surface of a metal part. In the measuring process, the two cold end probes are used for measuring voltage and temperature and acquiring data, the two hot end probes are introduced and are respectively positioned beside the two cold end probes, the four probes are arranged into a straight line on the horizontal position, the two hot end probes respectively provide heat sources independently without participating in the measuring process of voltage and temperature in calculating thermoelectric force, the technology is insensitive to the surface condition of the metal part, reduces the thermal contact resistance between the cold-end probe and the surface of the metal part, controls the temperature gradient between the two cold-end probes more accurately by adjusting the temperature difference between the two hot-end probes, and improves the measurement precision of the thermoelectric force of the metal part.

Drawings

FIG. 1 is a schematic diagram of a four probe format metal part thermoelectric detection system of the present invention;

FIG. 2 is a schematic diagram of the thermoelectric potential detection system of a four-probe type metal part according to the present invention.

In the figure, 1 a first hot end probe, 2 a first cold end probe, 3 a second cold end probe, 4 a second hot end probe, 5 a first guide rod, 6 a first polymer carrier, 7 a second guide rod, 8 a second polymer carrier, 9 a second heating unit, 10 a first heating unit, 11 a first Z-axis screw rod, 12 a first pressure sensor, 13 a first Z-axis electric sliding table, 14 a first Z-axis direct current motor, 15 a measuring unit box body, 16 a lifting handle, 17X-axis screw rods, 18X-axis electric sliding tables, 19X-axis direct current motors, 20 a second Z-axis direct current motor and 21 a second Z-axis electric sliding table, 22 second pressure sensor, 23 second Z-axis screw, 24 first cold-end probe manual lock, 25 second cold-end probe manual lock, 26 signal acquisition and control station, 27 thermoelectric potential measuring unit, 28 cable, 29 terminal equipment, 30 terminal equipment power line, 31 network line, 32 power supply device, 33 emergency stop button, 34 power line, 35 power socket, 36 second metal part fixing device, 37 second base, 38 second cushion block, 39 metal part, 40 second strap, 41 first strap, 42 first cushion block, 43 first base, 44 first metal part fixing device.

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 simplicity of description, and 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, are not to be construed as limiting the present invention.

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

Referring to fig. 1 and 2, the four-probe-type metal component thermoelectric potential detection system of the invention adopts four probes to simultaneously measure thermoelectric potential on the surface of a metal component, the four probes are arranged in a straight line on a horizontal position, two hot end probes are introduced and are respectively positioned beside two cold end probes, the two hot end probes respectively and independently provide heat sources, and the four hot end probes do not participate in the measurement process of voltage and temperature when calculating the thermoelectric potential.

The working principle of the invention is as follows: the thermoelectric potential measuring unit is fixed on the metal component to be measured through the metal component fixing device in the using process and is 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 potential measuring unit is in contact with the metal part to be measured, and measures thermoelectric potential data of the metal part to be measured.

A four-probe type metal part thermoelectric potential detection system comprises a thermoelectric potential measuring unit (27, a power supply device 32 and a metal part fixing device, wherein the metal part fixing device is fixed on a metal part 35 to be detected, the input end of the power supply device 32 is an external power supply, and the output end of the power supply device 32 is connected with the thermoelectric potential measuring unit 27.

The power supply device 32 is connected to an external power source via a power cord 34 and a power outlet 35.

The metal component thermoelectric potential detection device further comprises a terminal device 29; the terminal device 29 is connected to a power supply device 32.

The terminal device 29 is connected with the power supply device 32 through a terminal device power line 30 and a network cable 31; the power supply device 32 supplies power to the terminal device 29 through the terminal device power line 30, and the power supply device 32 outputs the acquisition signal and the control signal of the signal acquisition and control station 26 to the terminal device 29 through the network cable 31.

The thermoelectric potential measuring unit 27 comprises a hot end probe measuring unit, a cold end probe measuring unit and a signal acquisition and control station 26; the signal acquisition and control station 26 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 26 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 32 is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 26 through cables, and the power supply device 32 provides power for the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 28.

The power supply device 32 is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 26 through cables 28; the power supply device 32 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 26 through the cable 28, and supplies power to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station 26.

The hot end probe measuring unit comprises a first hot end probe measuring unit and a second hot end probe measuring unit, and the two hot end probe measuring units are fixed and installed in the measuring unit box body 15.

The first hot end probe measuring unit comprises a first hot end probe 1, an X-axis moving device, a first Z-axis moving device and a first heating unit 10; the Z-axis moving device and the first heating unit 10 are arranged in the measuring unit box body 15, the upper end of the first heating unit 10 is connected with the Z-axis moving device, the lower end of the first heating unit 10 is connected with the upper end of the first hot end probe 1, and the lower end of the first hot end probe 1 is exposed out of the measuring unit box body 15; the upper part of the measuring unit box body 15 is connected with an X-axis moving device.

The X-axis moving device comprises an X-axis screw rod 17, an X-axis electric sliding table 18 and an X-axis direct current motor 19, and the upper part of the measuring unit box body 15 is sequentially connected with the X-axis screw rod 17, the X-axis electric sliding table 18 and the X-axis direct current motor 19; the X-axis electric sliding table 18 and the X-axis direct current motor 19 are arranged in the unit box body 15, the right end of the X-axis screw rod 17 is connected with the X-axis electric sliding table 18, and the left end of the X-axis screw rod 17 is connected with the first Z-axis electric sliding table 13; the signal acquisition and control station 26 is in communication connection with the X-axis direct current motor 19, and the signal acquisition and control station 26 controls the X-axis direct current motor 19; the power supply device 32 is connected with the X-axis direct current motor 19 through a cable 28; the power supply device 32 connects an external power supply to the X-axis dc motor 19 through the cable 28 to supply power to the X-axis dc motor 19.

The first Z-axis moving device comprises a first Z-axis lead screw 11, a first pressure sensor 12, a first Z-axis electric sliding table 13 and a first Z-axis direct current motor 14, and the upper end of the first heating unit 10 is sequentially connected with the first Z-axis lead screw 11, the first pressure sensor 12, the first Z-axis electric sliding table 13 and the first Z-axis direct current motor 14; the signal acquisition and control station 26 is in communication connection with the first Z-axis direct current motor 14, the first pressure sensor 12 and the first heating unit 10, respectively, and the signal acquisition and control station 26 acquires the pressure measured by the first pressure sensor 12 and controls the first Z-axis direct current motor 14, the first pressure sensor 12 and the first heating unit 10; the power supply device 32 is respectively connected with the first heating unit 10 and the first Z-axis direct current motor 14 through cables 28; the power supply device 32 connects an external power supply to the first heating unit 10 and the first Z-axis dc motor 14 through the cable 28 to supply power to the first heating unit 10 and the first Z-axis dc motor 14.

The first 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 first heating unit 10, and the lower end of the cylinder is exposed out of the measuring unit box body 15; 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 39; the signal acquisition and control station 26 is respectively in communication connection with the copper probe and the platinum probe of the first hot-end probe 1, and the signal acquisition and control station 26 acquires the temperature measured by the platinum probe of the first hot-end probe 1.

The second hot end probe measuring unit comprises a second hot end probe 4, a second Z-axis moving device and a second heating unit 9; the second Z-axis moving device and the second heating unit 9 are arranged in the measuring unit box body 15, the upper end of the second heating unit 9 is connected with the second Z-axis moving device, the lower end of the second heating unit 9 is connected with the upper end of the second hot end probe 4, and the lower end of the second hot end probe 4 is exposed out of the measuring unit box body 15.

The second Z-axis moving device comprises a second Z-axis lead screw 23, a second pressure sensor 22, a second Z-axis electric sliding table 21 and a second Z-axis direct current motor 20, and the upper end of the second heating unit 9 is sequentially connected with the second Z-axis lead screw 23, the second pressure sensor 21, the second Z-axis electric sliding table 21 and the second Z-axis direct current motor 20; the signal acquisition and control station 26 is in communication connection with the second Z-axis direct current motor 20, the second pressure sensor 22 and the second heating unit 9 respectively, and the signal acquisition and control station 26 acquires the pressure measured by the second pressure sensor 22 and controls the second Z-axis direct current motor 20, the second pressure sensor 22 and the second heating unit 9; the power supply device 32 is respectively connected with the second heating unit 9 and the second Z-axis direct current motor 20 through cables 28; the power supply device 32 connects an external power supply to the second heating unit 9 and the second Z-axis dc motor 20 through the cable 28 to supply power to the second heating unit 9 and the second Z-axis dc motor 20.

The cold end probe measuring unit comprises a first cold end probe measuring unit and a second cold end probe measuring unit; 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; 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 probe measuring unit are exposed out of the unit box body 15.

The first cold-end probe measuring unit further comprises a first guide rod 5, a first polymer carrier 6 and a first cold-end probe manual lock 24; the upper end of the first cold-end probe 2 is connected with the lower end of a first guide rod 5, the upper end of the first guide rod 5 is connected with a first cold-end probe manual lock 24, the first cold-end probe 2 moves along the Z-axis direction through the first guide rod 5, and the lower end of the first cold-end probe 2 is exposed out of the unit box body 15 and is in contact with a metal part 39 and then is fixed in position through the first cold-end probe manual lock 24.

The second cold-end probe measuring unit further comprises a second guide rod 7, a second polymer carrier 8 and a second cold-end probe manual lock 25, the upper end of the second cold-end probe 2 is connected with the lower end of the second guide rod 7, the upper end of the second guide rod 7 is connected with the second cold-end probe manual lock 25, the second cold-end probe 3 moves along the Z-axis direction through the second guide rod 7, and the lower end of the second cold-end probe 3 is exposed out of the unit box body 15 and is in contact with the metal part 39 and then is fixed in position through the second cold-end probe manual lock 25.

The first cold end probe 2 comprises a copper probe, a first polymer carrier 6, a thermocouple and a copper wire; the upper end of the first polymer carrier 6 is connected with the lower end of the first guide rod 5, and the lower end of the first polymer carrier 6 is exposed out of the unit box body 15; the copper probe is embedded inside a first polymer carrier 6, 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 39, and the copper wires are used for measuring different voltage differences of the metal parts 39; the signal acquisition and control station 26 is respectively in communication connection with the thermocouple of the first cold-end probe 2 and the copper wire, 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 second cold-end probe 3 comprises a copper probe, a second polymer carrier 8, a thermocouple and a copper wire; the upper end of the second polymer carrier 8 is connected with the lower end of the second guide rod 7, and the lower end of the second polymer carrier 8 is exposed out of the unit box body 15; the copper probe is embedded inside the second polymer carrier 8, 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 39, and the copper wires are used for measuring different voltage differences of the metal parts 39; the signal acquisition and control station 26 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.

The unit box body 15 is an aluminum alloy shell; a handle 16 is arranged on the top of the unit box body 15.

The power supply device 32 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 in the power supply box body.

The metal part fixing device comprises a first metal part fixing device 36 and a second metal part fixing device 44, and the thermoelectric force measuring unit 27 is fixed on the metal part 39 through the first metal part fixing device 36 and the second metal part fixing device 44.

The first metal part fixing device 44 comprises a first base 43, a first cushion block 42 and a first strap 41, wherein the first strap 41 is wound on the metal part 39, a buckle is arranged at the end part of the first strap 41, the buckle is screwed on the first base 43, the first cushion block 42 is arranged at two corners of the first base 43, and the first cushion block 42 is in contact connection with the metal part 39.

The second metal part fixing device 36 comprises a second base 37, a second cushion block 38 and a second strap 40, the second strap 40 is wound on the metal part 39, a buckle is arranged at the end of the second strap 40, the buckle is screwed on the second base 37, the second cushion block 38 is arranged on each of four corners of the second base 37, and the second cushion block 38 is in contact connection with the metal part 39.

The four-probe type metal part thermoelectric potential detection system is used for detecting the thermoelectric potential of the metal part, and comprises the following steps:

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

after a measuring area is selected on the surface of the metal part 39 to be measured, an oxide layer and a rust layer on the surface of the metal part on site are removed, and the metal part is polished;

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

B1. firstly, a first metal part fixing device 44 and a second metal part fixing device 36 of the metal part thermoelectric potential detection system are installed, and a first base 43 and a second base 37 of the metal part thermoelectric potential detection system are respectively and firmly fixed on a metal part 39 to be measured, so as to keep a thermoelectric potential measuring unit 27 in place for measurement: the first metal part fixing device 44 comprises a first base 43, a first binding belt 41 and a first cushion block 42, wherein the first binding belt 41 is wound on the metal part 39, buckles of the first binding belt 41 are symmetrically screwed on the first base 43, the cushion blocks 42 are arranged at two corners of the first base 43, and after the first binding belt 41 tightly binds the metal part thermoelectric force detection system, the first base 43 is ensured to be fixed on the metal part 39 to be detected; the second metal part fixing device 36 comprises a second base 37, a second binding belt 40 and a second cushion block 38, wherein the second binding belt 40 is wound on the metal part 39, buckles of the second binding belt 40 are symmetrically screwed on the second base 37, the second cushion block 38 is arranged at four corners of the second base 37, and after the second binding belt 40 tightly ties the metal part thermoelectric potential detection system, the second base 37 is ensured to be fixed on the metal part 39 to be detected;

B2. during installation, the first hot-end probe 1, the first cold-end probe 2, the second cold-end probe 3 and the second hot-end probe 4 are all located at the middle position of a polishing area, the first cold-end probe 2 is manually moved and controlled, the guide rod 5 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 24 after the lower part of the first cold-end probe 2 is contacted with the metal part 39; then, the second cold-end probe 3 is moved and controlled manually, the guide rod 7 moves along the Z axis in the vertical direction, and the position of the lower part of the second cold-end probe 3 is fixed manually by the second cold-end probe 25 after the lower part of the second cold-end probe is contacted with the metal part 39;

B3. after the metal member thermoelectric force detection device is mounted on the metal member 39, the cable 34 of the power supply device 32, the terminal device power supply line 30, the network cable 31, the power supply line 34, and the power outlet 35 are connected. A 220V/50Hz external power supply is connected to the thermoelectric potential measuring unit 27 through a cable 28, and 24V voltage is output to the heating unit 1 of the hot-end probe 1, the first cold-end probe 2, the second cold-end probe 3, the X-axis direct current motor 19, the first Z-axis direct current motor 14, the first pressure sensor 12, the second Z-axis direct current motor 20, the first pressure sensor 22 and the signal acquisition and control station 26; thermoelectric force detection software which simultaneously connects the power supply device 32 to the terminal device 29 through the terminal device power line 30 and outputs the collected signal and the control signal to the pen terminal device 29 through the network line 31; finally, an external power supply of 220V is connected to the power supply device 32 through a power line 34 and a power socket 35;

B4. after the field installation of the metal part thermoelectric potential detection device is completed, a switch of a power supply device 32 is turned on, the terminal equipment 29 is turned on after electrification, and if the circuit is installed incorrectly, an emergency stop button 33 on the power supply device is immediately pressed;

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

the method comprises the following steps:

D1. the first hot-end probe 1 is heated to a set target temperature;

D2. the second hot-end probe 4 is heated to a set target temperature;

D3. the first hot-end probe 1 starts to descend and is in contact with the surface of the metal part 39 to be detected, the pressure is kept stable through the pressure sensor 12, and the whole first hot-end probe 1 can move along the Z axis in the vertical direction and the X axis in the horizontal direction;

D4. the second hot-end probe 4 starts to descend and is in contact with the surface of the metal part 39 to be detected, the pressure is kept stable through the pressure sensor 22, and the whole second hot-end probe 4 can move along the Z axis in the vertical direction;

D5. and signal acquisition and control. The first cold-end probe 2 and the second cold-end probe 3 form a measuring loop, the signal acquisition and control station 26 connects the first hot-end probe 1, the first cold-end probe 2, the second cold-end probe 3 and the second hot-end probe 4 through thermoelectric potential detection software on the power supply device 32 and the terminal device 29, acquires temperature measured by a platinum probe, pressure measured by the first pressure sensor 12, pressure measured by the second pressure sensor 22, temperature difference measured by a thermocouple and voltage difference signal measured by a copper wire, and controls the X-axis direct current motor 19, the first Z-axis direct current motor 14, the second Z-axis direct current motor 20, the first heated unit 10 and the second heated unit 9.

D6. The first hot side probe 1 is raised. After the signal acquisition of the previous measuring point is finished, the first hot-end probe 1 automatically rises to an initial vertical position along the Z axis in the vertical direction;

D7. the second hot side probe 4 is raised. After the signal acquisition of the previous measuring point is finished, the second hot-end probe 4 automatically rises to the initial vertical position along the Z axis in the vertical direction;

D8. the first hot side probe 1 moves to the next measurement point for measurement. The first hot end probe 1 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 39 to be measured, and keeps the pressure stable through the first pressure sensor 12;

D9. the second hot end probe 4 descends and contacts with the surface of the metal part 39 to be detected, and the pressure is kept stable through the pressure sensor 22;

D10. according to the number of the measuring points and the collecting times of the measuring points, the first hot-end probe 1 and the first hot-end probe 4 carry out repeated movement and measurement, and the signal collecting and controlling station 26 carries out corresponding signal collection and control;

D11. the first hot side probe 1 returns to the original position. After all the measuring points are measured and signals are acquired, the first 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 10 of the first hot-end probe 1 stops heating;

D12. the second hot side probe 4 returns to the original position. After all the measuring points are measured and signals are acquired, the second hot-end probe 4 automatically rises to the initial vertical position along the Z axis in the vertical direction, and meanwhile, the heating unit 9 of the second hot-end probe 4 stops heating;

and E, disassembling the metal part thermoelectric potential detection system on site.

After the thermoelectric force of the metal part 39 to be detected is measured, the thermoelectric force measuring unit 27, the power supply device 32, the first metal part fixing device 44, the second metal part fixing device 36, the terminal device 29, the cable 28, the power line 34, the terminal device power line 30, the network cable 31 and other auxiliary tools are arranged in a storage box, the testers and the metal part thermoelectric force detection system are all withdrawn from the site, and the thermoelectric force detection work of the metal part 39 on the site is completed.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood 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 shall be subject to the appended claims.

Claims (23)

1. A four-probe-type metal part thermoelectric potential detection system, characterized in that: comprises a thermoelectric potential measuring unit (27), a power supply device (32) and a metal component fixing device; the metal part fixing device is fixed on a metal part (35) to be detected; the input end of the power supply device (32) is an external power supply, and the output end of the power supply device (32) is connected with the thermoelectric potential measuring unit (27).

2. A four-probe version of the metal component thermoelectric voltage detection system of claim 1, wherein: the power supply device (32) is connected with an external power supply through a power line (34) and a power socket (35).

3. A four-probe version of the metal component thermoelectric voltage detection system of claim 1, wherein: the metal component thermoelectric potential detection device further comprises a terminal device (29); the terminal (29) is connected to a power supply device (32).

4. A four-probe version of the metal component thermoelectric voltage detection system of claim 3, wherein: the terminal equipment (29) is connected with a power supply device (32) through a terminal equipment power line (30) and a network cable (31); the power supply device (32) supplies power to the terminal equipment (29) through a terminal equipment power line (30), and the power supply device (32) outputs the acquisition signal and the control signal of the signal acquisition and control station (26) to the terminal equipment (29) through a network cable (31).

5. A metal part thermoelectric detection system in the form of a four-probe according to any of claims 1 to 4 wherein: the thermoelectric potential measuring unit (27) comprises a hot end probe measuring unit, a cold end probe measuring unit and a signal acquisition and control station (26); the signal acquisition and control station (26) 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 (26) 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 (32) is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (26) through cables, and the power supply device (32) provides power for the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (28).

6. A four-probe version of the metal component thermoelectric voltage detection system of claim 5, wherein: the power supply device (32) is respectively connected with the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (26) through cables (28); and the power supply device (32) 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 (26) through a cable (28) and supplying power to the hot end probe measuring unit, the cold end probe measuring unit and the signal acquisition and control station (26).

7. A metal part thermoelectric voltage detection system in the form of a four-probe according to claim 5 wherein: the hot end probe measuring unit comprises a first hot end probe measuring unit and a second hot end probe measuring unit, and the two hot end probe measuring units are fixed and installed in the measuring unit box body (15).

8. A four-probe version of the metal component thermoelectric voltage detection system of claim 7, wherein: the first hot end probe measuring unit comprises a first hot end probe (1), an X-axis moving device, a first Z-axis moving device and a first heating unit (10); the Z-axis moving device and the first heating unit (10) are arranged in the measuring unit box body (15), the upper end of the first heating unit (10) is connected with the Z-axis moving device, the lower end of the first heating unit (10) is connected with the upper end of the first hot end probe (1), and the lower end of the first hot end probe (1) is exposed out of the measuring unit box body (15); the upper part of the measuring unit box body (15) is connected with an X-axis moving device.

9. A four-probe version of the metal component thermoelectric voltage detection system of claim 8, wherein: the X-axis moving device comprises an X-axis screw rod (17), an X-axis electric sliding table (18) and an X-axis direct current motor (19), and the upper part of the measuring unit box body (15) is sequentially connected with the X-axis screw rod (17), the X-axis electric sliding table (18) and the X-axis direct current motor (19); the X-axis electric sliding table (18) and the X-axis direct current motor (19) are arranged in the unit box body (15), the right end of the X-axis screw rod (17) is connected with the X-axis electric sliding table (18), and the left end of the X-axis screw rod (17) is connected with the first Z-axis electric sliding table (13); the signal acquisition and control station (26) is in communication connection with the X-axis direct current motor (19), and the signal acquisition and control station (26) controls the X-axis direct current motor (19); the power supply device (32) is connected with the X-axis direct current motor (19) through a cable (28); the power supply device (32) connects an external power supply to the X-axis direct current motor (19) through a cable (28) to supply power to the X-axis direct current motor (19).

10. A metal part thermoelectric voltage detection system in the form of a four-probe according to claim 8 wherein: the first Z-axis moving device comprises a first Z-axis screw rod (11), a first pressure sensor (12), a first Z-axis electric sliding table (13) and a first Z-axis direct current motor (14), and the upper end of the first heating unit (10) is sequentially connected with the first Z-axis screw rod (11), the first pressure sensor (12), the first Z-axis electric sliding table (13) and the first Z-axis direct current motor (14); the signal acquisition and control station (26) is respectively in communication connection with the first Z-axis direct current motor (14), the first pressure sensor (12) and the first heating unit (10), and the signal acquisition and control station (26) acquires pressure measured by the first pressure sensor (12) and controls the first Z-axis direct current motor (14), the first pressure sensor (12) and the first heating unit (10); the power supply device (32) is respectively connected with the first heating unit (10) and the first Z-axis direct current motor (14) through a cable (28); the power supply device (32) connects an external power supply to the first heating unit (10) and the first Z-axis direct current motor (14) through a cable (28) to supply power to the first heating unit (10) and the first Z-axis direct current motor (14).

11. A metal part thermoelectric voltage detection system in the form of a four-probe according to claim 8 wherein: the first 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 first heating unit (10), and the lower end of the cylinder is exposed out of the measuring unit box body (15); 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 (39); the signal acquisition and control station (26) is respectively in communication connection with the copper probe and the platinum probe of the first hot-end probe (1), and the signal acquisition and control station (26) acquires the temperature measured by the platinum probe of the first hot-end probe (1).

12. A four-probe version of the metal component thermoelectric voltage detection system of claim 7, wherein: the second hot end probe measuring unit comprises a second hot end probe (4), a second Z-axis moving device and a second heating unit (9); the second Z-axis moving device and the second heating unit (9) are arranged in the measuring unit box body (15), the upper end of the second heating unit (9) is connected with the second Z-axis moving device, the lower end of the second heating unit (9) is connected with the upper end of the second hot end probe (4), and the lower end of the second hot end probe (4) is exposed out of the measuring unit box body (15).

13. A four-probe version of the metal component thermoelectric voltage detection system of claim 12, wherein: the second Z-axis moving device comprises a second Z-axis screw rod (23), a second pressure sensor (22), a second Z-axis electric sliding table (21) and a second Z-axis direct current motor (20), and the upper end of the second heating unit (9) is sequentially connected with the second Z-axis screw rod (23), the second pressure sensor (21), the second Z-axis electric sliding table (21) and the second Z-axis direct current motor (20); the signal acquisition and control station (26) is respectively in communication connection with the second Z-axis direct current motor (20), the second pressure sensor (22) and the second heating unit (9), and the signal acquisition and control station (26) acquires pressure measured by the second pressure sensor (22) and controls the second Z-axis direct current motor (20), the second pressure sensor (22) and the second heating unit (9); the power supply device (32) is respectively connected with the second heating unit (9) and the second Z-axis direct current motor (20) through cables (28); the power supply device (32) is used for connecting an external power supply to the second heating unit (9) and the second Z-axis direct current motor (20) through a cable (28) and supplying power to the second heating unit (9) and the second Z-axis direct current motor (20).

14. A four-probe version of the metal component thermoelectric voltage detection system of claim 5, wherein: the cold end probe measuring unit comprises a first cold end probe measuring unit and a second cold end probe measuring unit; 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); 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 (15).

15. A four-probe version of the metal component thermoelectric voltage detection system of claim 14, wherein: the first cold-end probe measuring unit further comprises a first guide rod (5), a first polymer carrier (6) and a first cold-end probe manual lock (24); the cold junction probe is characterized in that the upper end of the first cold junction probe (2) is connected with the lower end of the first guide rod (5), the upper end of the first guide rod (5) is connected with the manual lock (24) of the first cold junction probe, the first cold junction probe (2) moves along the Z-axis direction through the first guide rod (5), and the lower end of the first cold junction probe (2) is exposed out of the unit box body (15) and is in contact with the metal component (39) and then is fixed in position through the manual lock (24) of the first cold junction probe.

16. A four-probe version of the metal component thermoelectric voltage detection system of claim 14, wherein: the second cold-end probe measuring unit further comprises a second guide rod (7), a second polymer carrier (8) and a second cold-end probe manual lock (25), the upper end of the second cold-end probe (2) is connected with the lower end of the second guide rod (7), the upper end of the second guide rod (7) is connected with the second cold-end probe manual lock (25), the second cold-end probe (3) moves along the Z-axis direction through the second guide rod (7), and the lower end of the second cold-end probe (3) is exposed out of the unit box body (15) and contacts with the metal component (39) and then is fixed in position through the second cold-end probe manual lock (25).

17. A four-probe version of the metal component thermoelectric voltage detection system of claim 15, wherein: the first cold-end probe (2) comprises a copper probe, a first polymer carrier (6), a thermocouple and a copper wire; the upper end of the first polymer carrier (6) is connected with the lower end of the first guide rod (5), and the lower end of the first polymer carrier (6) is exposed out of the unit box body (15); the copper probe is embedded inside a first polymer carrier (6), 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 (39), and the copper wires are used for measuring different voltage differences of the metal parts (39); the signal acquisition and control station (26) 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).

18. A metal part thermoelectric voltage detection system in the form of a four-probe according to claim 16 wherein: the second cold-end probe (3) comprises a copper probe, a second polymer carrier (8), a thermocouple and a copper wire; the upper end of the second polymer carrier (8) is connected with the lower end of the second guide rod (7), and the lower end of the second polymer carrier (8) is exposed out of the unit box body (15); the copper probe is embedded in a second polymer carrier (8), 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 (39), and the copper wires are used for measuring different voltage differences of the metal parts (39); and the signal acquisition and control station (26) is respectively in communication connection with the thermocouple of the second cold-end probe (3) and the copper wire, 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).

19. A four-probe version of the metal component thermoelectric voltage detection system of claim 7, wherein: the unit box body (15) is an aluminum alloy shell; and a handle (16) is arranged at the top of the unit box body (15).

20. A four-probe version of the metal component thermoelectric voltage detection system of claim 1, wherein: the power supply device (32) 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 in the power supply box body.

21. A four-probe version of the metal component thermoelectric voltage detection system of claim 1, wherein: the metal part fixing device comprises a first metal part fixing device (36) and a second metal part fixing device (44), and the thermoelectric force measuring unit (27) is fixed on the metal part (39) through the first metal part fixing device (36) and the second metal part fixing device (44).

22. A four-probe version of the metal component thermoelectric voltage detection system of claim 21, wherein: the first metal part fixing device (44) comprises a first base (43), a first cushion block (42) and a first binding belt (41), wherein the first binding belt (41) is wound on the metal part (39), a buckle is arranged at the end part of the first binding belt (41), the buckle is screwed on the first base (43), the first cushion block (42) is arranged on two corners of the first base (43), and the first cushion block (42) is in contact connection with the metal part (39).

23. A four-probe version of the metal component thermoelectric voltage detection system of claim 21, wherein: the second metal part fixing device (36) comprises a second base (37), a second cushion block (38) and a second binding belt (40), wherein the second binding belt (40) is wound on the metal part (39), a buckle is arranged at the end part of the second binding belt (40), the buckle is screwed on the second base (37), the second cushion block (38) is arranged on four corners of the second base (37), and the second cushion block (38) is in contact connection with the metal part (39).

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