CN216747312U - Steel bar multi-point corrosion calibration device suitable for built-in magnetic sensor - Google Patents
Steel bar multi-point corrosion calibration device suitable for built-in magnetic sensor Download PDFInfo
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Abstract
A multi-point corrosion calibration device for a steel bar suitable for a built-in magnetic sensor comprises a main body unit, a calibration hole unit, a built-in moving unit, an up-down moving unit, a first fixing unit and a second fixing unit, wherein the main body unit is a transparent outer frame; the built-in mobile unit is a main body unit provided with a slot, and the circle center of the opening of the built-in mobile unit slot is superposed with the circle center of the calibration hole unit and is used for placing and installing the built-in magnetic sensor. The utility model has simple operation, high accuracy, low cost and strong laboratory applicability, and is suitable for reinforcing steel bars of various sizes.
Description
Technical Field
The utility model relates to a steel bar calibration device and a steel bar calibration method in a reinforced concrete test, in particular to a steel bar multi-point corrosion calibration device and a steel bar multi-point corrosion calibration method suitable for a built-in magnetic sensor.
Background
Corrosion of steel reinforcement is one of the major problems in the durability of reinforced concrete structures. Therefore, the method for preventing and repairing the steel bar corrosion of the structure is an effective method for solving the problem of the steel bar corrosion. At present, various nondestructive testing methods for steel bar corrosion are widely researched, wherein a physical method can reflect the steel bar corrosion from different physical parameters, and the method is a research hotspot related to a steel bar corrosion measurement technology. Because the physical method is researched based on the basic motion law and basic characteristics of the substance, the change condition of the substance can be reflected better. Therefore, the physical method is more suitable for the in-situ test of the steel bar corrosion, and the real corrosion condition of the steel bar in the concrete structure can be obtained in the in-situ test. In the physical properties of the steel bar, the steel bar is a ferromagnetic substance, and the corrosion product of the steel bar is composed of paramagnetic and ferrimagnetic substances, so that the steel bar corrosion condition can be tested in situ from the magnetic direction, and the change of a magnetic signal during the steel bar corrosion can be obtained through testing. The corrosion amount of the steel bar can be measured by establishing a relation between the change of the magnetic signal and the corrosion amount of the steel bar. Therefore, the steel bar corrosion state measuring method based on magnetism has important research significance for application in practical engineering.
A steel bar corrosion monitoring method based on a magnetic field principle is disclosed as Chinese patent application publication No. CN108469514A with the publication date of 2018, 8 and 31 days, namely 'a monitoring device and a method for steel bar corrosion behavior in concrete', Chinese patent publication No. CN208420791U with the publication date of 2019, 1 and 22 days, namely 'a steel bar corrosion electromagnetic field variable response device', Chinese patent application publication No. CN 109374726A with the publication date of 2019, 2 and 22 days, namely 'a steel bar corrosion nondestructive dynamic monitoring sensor and system in concrete based on a magnetic field', Chinese patent application publication No. CN110646505A with the publication number of 1 and 3 days in 2020, namely 'an external steel bar corrosion nondestructive monitoring sensor and testing method based on an electromagnetic field principle' and Chinese patent application publication No. CN112034033A with the publication number of 2020, 12 and 4 days, namely 'a separated steel bar non-uniform corrosion monitoring sensor and testing method based on the magnetic field principle', the patent provides a plurality of steel bar corrosion monitoring sensors based on the magnetic field principle and monitoring methods thereof, which are used for monitoring the steel bar corrosion condition in a reinforced concrete structure. The corrosion monitoring sensor is generally used for in-situ monitoring of the steel bars. In the laboratory verification stage of the sensor, the corrosion steel bars need to be calibrated to determine the corrosion degree. The reinforcing bar corrosion monitoring system that above patent relates to lacks removal and positioner, can't realize reinforcing bar normal position corrosion monitoring.
The steel bar calibration needs higher precision, after the steel bar is shifted and weighed and rusted manually, the relative position of the steel bar and a sensor measuring head needs to be adjusted, so that the relative position of a steel bar measuring point and the measuring head is completely consistent with that before shifting, and magnetic induction reading can be carried out. The calibration is realized by means of auxiliary tools such as a clamp and a graduated scale, the operation difficulty is high, and the test precision is difficult to ensure.
Chinese patent application publication No. CN 113008976A, the application publication date of 2021, 06 and 22, is entitled "a steel bar corrosion device and a calibration method suitable for three magnetic sensors", and this patent simultaneously satisfies the calibration requirements of various types of sensors, but considers that the components of the built-in sensor need to be embedded in concrete in the practical application process of the sensor, and can not calibrate each position of the steel bar; in addition, although this patent has satisfied the calibration accuracy problem that manual correction can't guarantee different size reinforcing bars, can't guarantee in the calibration process that the reinforcing bar that waits to demarcate does not rock, so in order to improve the precision of demarcation, guarantee to wait to demarcate the reinforcing bar and keep fixed also need consider.
The feasible alternative scheme is that a movable positioning device and a fixing device for fixing the steel bar to be calibrated are used, and the movable positioning device can simultaneously realize the functions of moving and fixing the built-in magnetic sensor. Based on the theory, the chinese patent No. CN 208083922U, with a publication date of 2018, 11 and 13, is named as "a mobile linear guide rail positioning device", and this patent mainly relates to the technical field of positioning equipment, but this patent cannot guarantee positioning accuracy when the equipment is positioned and is prone to offset when the equipment is positioned. The method is mainly used in the field of equipment and only used for reference in laboratory steel bar calibration.
Further, considering that the research on the durability of reinforced concrete is a popular field in recent years, many laboratories in China are conducting the research on corrosion of reinforced concrete. A calibration device for positioning reinforcing steel bars of various sizes at multiple movable points provides convenience for tests.
The above problems need to be solved. Therefore, the steel bar multi-point corrosion calibration device suitable for the built-in magnetic sensor is specially developed, has very important engineering value, can greatly improve the efficiency of a steel bar corrosion test in a laboratory, and helps the research to be smoothly carried out.
Disclosure of Invention
In order to overcome the defect that the existing test calibration device cannot move and position corrosion monitoring, the utility model provides the corrosion reinforcing steel bar calibration device and the calibration method thereof, which are simple and convenient to operate, easy to disassemble, high in accuracy, low in cost and extremely high in laboratory applicability.
The technical scheme adopted by the utility model for solving the technical problem is as follows:
a multi-point corrosion calibration device for a steel bar suitable for a built-in magnetic sensor comprises a main body unit, a calibration hole unit, a built-in moving unit, an up-down moving unit, a first fixing unit and a second fixing unit, wherein the main body unit is a transparent outer frame; the built-in mobile unit is a main body unit provided with a slot, and the circle center of the opening of the built-in mobile unit slot is superposed with the circle center of the calibration hole unit and is used for placing and installing the built-in magnetic sensor.
Furthermore, the main body unit is provided with threaded holes according to the mounting positions of the up-down moving unit, the first fixing unit and the second fixing unit, the threaded holes correspond to the threaded holes in the up-down moving unit, the first fixing unit and the second fixing unit one by one and are used for mounting and fixing the up-down moving unit, the first fixing unit and the second fixing unit.
Still further, the main body unit is made of transparent acrylic materials. The reinforcing bar can be directly observed through the device in the calibration stage, so that experimental analysis is facilitated. In order to improve the cost performance of the device, other transparent environment-friendly light materials can be adopted. Preferably, the main body unit can also be made of other transparent environment-friendly light materials so as to meet the cost performance requirement of the calibration device.
Furthermore, the calibration hole unit can realize the calibration of reinforcing steel bars with the diameter of 14-20 mm commonly used in the building field, scale marks are arranged on the edge of the calibration hole unit and used for calibrating the reinforcing steel bars and ensuring the calibration precision, and the calibration hole unit is used for the calibration of the reinforcing steel bars of the built-in magnetic sensor.
In the built-in mobile unit, the built-in magnetic sensor is a complete sensor structure and participates in steel bar calibration.
The up-down moving unit comprises an upper polish rod, a lower polish rod, a trapezoidal fixed part, a linear track and a concave sliding block; scales are arranged on the upper and lower polish rods, so that a tester can visually and accurately measure the displacement value of the built-in magnetic sensor after moving up and down, and the steel bar corrosion position to be calibrated can be accurately positioned; the trapezoidal fixing piece is provided with three threaded through holes and is connected with the main body unit through bolts, and a round hole is formed in the middle of the trapezoidal fixing piece so that the upper and lower polish rods can penetrate through the round hole to be convenient for controlling and fixing the upper and lower polish rods; five threaded holes are formed in the linear guide rail and are used for being connected with the main body unit through bolts, and grooves are formed in two sides of the linear rail and are used for the concave sliding block to slide up and down in the linear rail; the concave slider is in threaded connection with the upper and lower polish rods, four threaded through holes are formed in the middle concave part of the concave slider and are fixedly connected with the linear guide rail through bolts, two threaded through holes are formed in the bottom of the concave slider and are used for being fixed with the built-in magnetic sensor, and the concave slider is driven to slide up and down on the linear guide rail by controlling the upper and lower polish rods, so that the built-in magnetic sensor moves up and down.
The first fixing unit comprises a first arc-shaped fixing clamp, a first screw rod and a first locking nut; the left side and the right side of the first circular arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the upper polish rod and the lower polish rod, and the fixing surface is provided with a threaded hole for fixing with the main body unit; the first screw rod is connected with a first locking nut bolt through the threaded hole, and the first arc-shaped fixed clamp fixing surface and the first screw rod are in close contact with the left and right surfaces of the upper and lower polish rods;
the second fixing unit comprises a second arc-shaped fixing clamp, a second screw and a second locking nut; the left side and the right side of the second arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the steel bar to be calibrated, and the fixing surface is provided with a threaded hole for fixing with the main body unit; the second screw rod is connected with a second locking nut through the threaded hole, and the fixing surface of the second arc-shaped fixing clamp and the second screw rod are in close contact with the left surface and the right surface of the steel bar to be calibrated.
As an improvement, the upper and lower polished rods are provided with scales for a tester to visually and accurately measure the up-and-down movement length value of the built-in magnetic sensor, so that the corrosion position of the steel bar is accurately positioned.
As an improvement, the linear guide rail provided by the utility model is made of chromium bearing steel, and grooves are formed in two sides of the linear rail so that the concave sliding block can slide up and down in the linear rail.
The concave sliding block is smooth in surface, a groove is formed in the inner side of the sliding block and used for being connected with the linear guide rail, a groove is formed in the outer side of the sliding block and used for ensuring that the magnetic sensor is embedded into the concave sliding block, and a threaded through hole is formed in the bottom of the sliding block and used for being fixed with the built-in magnetic sensor.
The utility model has the following beneficial effects: the method can overcome the defects of difficult operation and low precision in the calibration process under the laboratory environment, breaks through the limitation of the traditional embedded sensor calibration test method, and realizes the movement of the built-in magnetic sensor and the accurate positioning of the corrosion of each position of the reinforcing steel bar; the steel bar corrosion calibration device has the advantages of clear principle, simplicity and convenience in method, accuracy in positioning, reusability, good stability and the like, and can make up for the defects of the existing steel bar corrosion calibration device.
Drawings
Fig. 1 is an overall structural schematic diagram of a steel bar multipoint corrosion calibration device suitable for a built-in magnetic sensor.
Fig. 2 is a schematic diagram of the overall structure of the up-down moving unit of the multi-point corrosion calibration device for the steel bars, which is suitable for the built-in magnetic sensor.
Fig. 3 is three views of the multi-point corrosion calibration device for steel bars suitable for the built-in magnetic sensor, wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 4 is a three-view of a main body unit of the steel bar multi-point corrosion calibration device suitable for the built-in magnetic sensor. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 5 is a schematic view of a built-in mobile unit slot.
Fig. 6 is a three-dimensional view of the built-in sensor, in which (a) is a front view, (b) is a right side view, and (c) is a top view.
Fig. 7 is a three-view diagram of a circular arc-shaped fixing unit of the steel bar multi-point corrosion calibration device suitable for the built-in magnetic sensor. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 8 is a three-view diagram of an up-and-down moving unit of the multi-point corrosion calibration device for the steel bars, which is suitable for the built-in magnetic sensor. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 9 is a three-view of the up and down polish rod and concave slider of the up and down moving unit. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 10 is a three-view of the trapezoidal fixing member of the up-and-down moving unit. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Fig. 11 is a three-dimensional view of the linear guide of the up-and-down moving unit. Wherein (a) is a front view, (b) is a right view, and (c) is a top view.
Reference numbers in the figures: 1. a main body unit; 2. a calibration hole unit; 3. a built-in mobile unit; 4. an up-down moving unit; 5. a first fixing unit; 6. a second fixing unit; 7. the built-in mobile unit is grooved; 8. scale lines; 9. an upper polish rod and a lower polish rod; 10. a trapezoidal fixing member; 11. a concave slider; 12. a linear guide rail; 13. a first bolt unit; 14. a second bolt unit; 15. a third bolt unit; 16. a fourth bolt unit; 17. a fifth bolt unit; 18. a sixth bolt unit; 19. a seventh bolt unit; 20. an eighth bolt unit; 21. a ninth bolt unit; 22. a tenth bolt unit; 23. an eleventh bolt unit; 24. a twelfth bolt unit; 25. a thirteenth bolt unit; 26. a fourteenth bolt unit; 27. a fifteenth bolt unit; 28. a first screw hole unit; 29. a second screw hole unit; 30. a third screw hole unit; 31. a fourth screw hole unit; 32. a fifth screw hole unit; 33. a sixth screw hole unit; 34. a seventh screw hole unit; 35. an eighth threaded hole unit; 36. a ninth screw hole unit; 37. a tenth screw hole unit; 38. an eleventh screw hole unit; 39. a twelfth screw hole unit; 40. a thirteenth screw hole unit; 41. a fourteenth screw hole unit; 42. a fifteenth screw hole unit; 43. a first lock nut; 44. a second lock nut; 45. a first circular arc-shaped fixing clamp; 46. a second arc-shaped fixing clamp; 47. a first screw; 48. a second screw.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, wherein the terms "upper", "lower", "front", "rear", "left", "right", "bottom", and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience of description only and does not require that the utility model be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.
Referring to fig. 1 to 11, a multi-point corrosion calibration device for a steel bar suitable for a built-in magnetic sensor includes a main body unit 1, a calibration hole unit 2, a built-in moving unit 3, an up-down moving unit 4, a first fixing unit 5, and a second fixing unit 6.
The main body unit 1 is made of transparent acrylic material. The reinforcing bar can be directly observed through the device in the calibration stage, so that experimental analysis is facilitated. In order to improve the cost performance of the device, other transparent environment-friendly light materials can be adopted. Preferably, the main body unit 1 can also be made of other transparent environment-friendly light materials so as to meet the cost performance requirement of the calibration device.
Threaded holes are formed in the main body unit 1 according to the installation positions of the up-down moving unit 4, the first fixing unit 5 and the second fixing unit 6, correspond to the threaded holes in the up-down moving unit 4, the first fixing unit 5 and the second fixing unit 6 one by one, and are used for installing and fixing the up-down moving unit 4, the first fixing unit 5 and the second fixing unit 6;
the calibration hole unit 2 is a cylindrical hole on the main body unit 1. Can realize the standardization of 14 ~ 20mm diameter reinforcing bars commonly used in the building field. The hole edge of the calibration hole unit 2 is provided with scale marks 8 for calibrating the steel bars and ensuring the calibration precision. The calibration hole unit 2 is used for calibrating the built-in magnetic sensor steel bars;
the built-in mobile unit 3 is a slot on the main body unit 1, and the center of the opening of the built-in mobile unit 3 coincides with the center of the calibration hole unit 2; the built-in magnetic sensor is used for being placed and installed, is a complete sensor structure and participates in steel bar calibration;
the up-down moving unit 4 comprises an upper polish rod 9, a lower polish rod 9, a trapezoidal fixing piece 10, a linear track 12 and a concave sliding block 11; the upper and lower polish rods 9 are provided with scales for a tester to visually and accurately measure the displacement value of the built-in magnetic sensor after moving up and down, so that the steel bar corrosion position to be calibrated is accurately positioned; the trapezoidal fixing piece 10 is provided with three threaded through holes and is connected with the main body unit 1 through bolts, and a round hole is formed in the middle of the trapezoidal fixing piece 10, so that the upper and lower polish rods 9 can penetrate through the round hole, and the upper and lower polish rods 9 can be controlled and fixed conveniently; five threaded holes are formed in the linear guide rail 12 and are used for being connected with the main body unit 1 through bolts, and grooves are formed in two sides of the linear guide rail 12 and are used for enabling the concave sliding blocks 11 to slide up and down in the linear guide rail; the concave slider 11 is in threaded connection with the upper and lower polish rods 9, four threaded through holes are formed in the middle concave part of the concave slider 11 and are fixedly connected with the linear guide rail 12 through bolts, two threaded through holes are formed in the bottom of the concave slider 11 and are used for being fixed with the built-in magnetic sensor, and the concave slider 11 is driven to slide up and down on the linear guide rail 12 by controlling the upper and lower polish rods 9, so that the built-in magnetic sensor moves up and down.
The first fixing unit 5 comprises a first arc-shaped fixing clamp 45, a first screw rod 47 and a first locking nut 43; the left side and the right side of the first circular arc-shaped fixing clamp 45 are respectively provided with a fixing surface and a threaded hole for fixing the upper polish rod 9 and the lower polish rod 9, and the fixing surface is provided with a threaded hole for fixing the main body unit 1; the first screw rod 47 is in bolt connection with the first locking nut 43 through the threaded hole, and the fixing surface of the first circular arc fixing clamp 45 and the first screw rod 47 are in close contact with the left and right surfaces of the upper polish rod 9 and the lower polish rod 9;
the second fixing unit 6 comprises a second arc-shaped fixing clamp 46, a second screw 48 and a second locking nut 44; the left side and the right side of the second arc-shaped fixing clamp 46 are respectively provided with a fixing surface and a threaded hole for fixing the steel bar to be calibrated, and the fixing surface is provided with a threaded hole for fixing the main body unit 1; the second screw 48 is connected with the second locking nut 44 through the threaded hole, and the fixing surface of the second circular arc fixing clamp 46 and the second screw 48 are in close contact with the left surface and the right surface of the steel bar to be calibrated.
As an improvement, the upper and lower polish rods 9 are provided with scales for a tester to visually and accurately measure the up-and-down movement length value of the built-in magnetic sensor, so that the corrosion position of the steel bar is accurately positioned.
As an improvement, the linear guide rail 12 of the utility model adopts chromium bearing steel, and grooves are arranged on two sides of the linear track 12 for the concave sliding block 11 to slide up and down in the linear track.
As an improvement, the surface of the concave sliding block 11 is smooth, a groove is formed in the inner side of the sliding block 11 and used for being connected with the linear guide rail 12, a groove is formed in the outer side of the sliding block 11 and used for ensuring that the magnetic sensor is embedded into the concave sliding block 11, and a threaded through hole is formed in the bottom of the sliding block 11 and used for being fixed with the built-in magnetic sensor.
As an improvement, two sides of the first circular arc fixing clamp 45 and the second circular arc fixing clamp 46 are respectively provided with a fixing surface and a threaded hole, and the fixing surface, the first screw 47 and the second screw 48 are in close contact with the upper polish rod 9, the lower polish rod 9 and the steel bar to be calibrated through the threaded holes, so that the first circular arc fixing clamp 45 and the second circular arc fixing clamp 46 are fixed with the upper polish rod 9, the lower polish rod 9 and the steel bar to be calibrated.
The calibration method of the multi-point corrosion calibration device for the reinforcing steel bar suitable for the built-in magnetic sensor comprises the following steps:
the device body unit 1 of the present invention is placed on a non-inclined plane and the calibration device is ready to be completed.
First, the sensor fitting is installed: the built-in magnetic sensor is placed into the main body unit 1 from the built-in moving unit slot 7, and the built-in moving unit 3 is embedded into the concave slider 11 and is arranged on the up-down moving unit 4; the position of the built-in magnetic sensor is adjusted by moving the upper and lower polish rods 9, the upper and lower polish rods 9 are fixed by adjusting the first locking nut 43 by the first circular arc fixing clamp 45, and the moving distance of the built-in magnetic sensor is recorded according to the scale marks of the upper and lower polish rods 9;
then, after being weighed, the steel bar to be calibrated is inserted into the calibration hole unit 2, the steel bar is marked according to the position indicated by the calibration line 8 on the edge of the calibration hole, and the steel bar to be calibrated is fixed through the second fixing unit 6;
reading with a built-in sensor; taking out the steel bars and carrying out electrification corrosion; weighing the steel bars again after the corrosion is finished; reinserting the steel bars into the calibration hole unit 2; correcting the position of the steel bar according to the scale marks 8 and the marks on the steel bar to ensure that the position of the steel bar is consistent with that before the steel bar is taken out; reading by using the built-in magnetic sensor again;
and finally, calibrating the steel bar corrosion condition according to the measured mass change and the magnetic induction intensity change.
It should be noted that, when the next calibration is performed, the rust at different positions of the steel bar is tested, and only the position of the built-in magnetic sensor needs to be moved, the first screw 47 is screwed out, and the upper and lower polish rods 9 can move up and down along the first circular arc-shaped fixing clamp 45, so that the built-in magnetic sensor moves up and down along the up-down moving unit 4. The corrosion of each size reinforcing bar is tested, only need put into the reinforcing bar of different sizes mark hole unit 2, unscrew second screw rod 48, wait to mark the reinforcing bar and fixed by second arc fixation clamp 46 to do not rock when making the reinforcing bar mark, improved the accuracy of demarcation.
The specific calibration calculation formula is as follows:
1. record the mass of the test piece as miICorresponding magnetic induction intensity data B of calibration reinforcing steel bar before corrosion of reinforced concrete test pieceiII is the electrifying time, I is the mark before electrifying, and II is the mark after electrifying;
2. the simulation experiment of the steel bar corrosion is realized in a mode of accelerating the corrosion by current, the current density is controlled to be the same as the electrifying time, and the mass is miIElectrifying the corresponding reinforced concrete test pieces for i days respectively;
3. recording magnetic induction intensity data B of calibration steel bars after corrosion of reinforced concrete test pieceiIIAnd steel bar quality data miII；
Respectively calculating and calibrating the mass change rate delta m of the reinforcing steel bariThe calculation formula is formula (1);
respectively calculating and calibrating the magnetic induction intensity change rate delta B of the reinforcing steel barsiThe calculation formula is formula (2)
And performing linear fitting on the relationship between the steel bar mass change rate and the Hall sensor magnetic induction intensity change rate to obtain a linear relationship coefficient alpha, and completing calibration.
In the specific implementation, the utility model does not limit the specific device type, as long as the device can complete the above functions.
The embodiments described in this specification are merely examples of implementations of the inventive concepts, which are intended for illustrative purposes only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (10)
1. A multi-point-position corrosion calibration device for a steel bar suitable for a built-in magnetic sensor is characterized by comprising a main body unit, a calibration hole unit, a built-in moving unit, an up-down moving unit, a first fixing unit and a second fixing unit, wherein the main body unit is a transparent outer frame, the up-down moving unit, the first fixing unit and the second fixing unit are arranged on the main body unit, and the calibration hole unit is a cylindrical hole in the main body unit and is used for calibrating the steel bar in the field of buildings; the built-in mobile unit is a main body unit provided with a slot, and the circle center of the opening of the built-in mobile unit slot is superposed with the circle center of the calibration hole unit and is used for placing and installing the built-in magnetic sensor.
2. The multi-point corrosion calibration device for the steel bars of the built-in magnetic sensor as claimed in claim 1, wherein the body unit is provided with screw holes according to the installation positions of the up-down moving unit, the first fixing unit and the second fixing unit, and the screw holes are corresponding to the screw holes of the up-down moving unit, the first fixing unit and the second fixing unit one by one, and are used for installation and fixation of the up-down moving unit, the first fixing unit and the second fixing unit.
3. The multipoint-position corrosion calibration device for the steel bars of the built-in magnetic sensor as claimed in claim 1 or 2, wherein the main body unit is made of transparent acrylic material.
4. The multi-point corrosion calibration device for the steel bars suitable for the built-in magnetic sensor as claimed in claim 1 or 2, wherein the calibration hole unit is a cylindrical hole on the main unit, and can realize calibration of the steel bars with the diameter of 14-20 mm in the field of buildings, and the edge of the calibration hole unit is provided with scale marks.
5. The multi-point corrosion calibration device for the steel bars suitable for the built-in magnetic sensor as claimed in claim 1 or 2, wherein the up-down moving unit comprises an upper and a lower polished rods, a trapezoidal fixed part, a linear track and a concave sliding block; the upper and lower polish rods are provided with scales; the trapezoidal fixing piece is provided with three threaded through holes and is connected with the main body unit through bolts, and a round hole is formed in the middle of the trapezoidal fixing piece so that the upper and lower polish rods can penetrate through the round hole to be convenient for controlling and fixing the upper and lower polish rods; five threaded holes are formed in the linear track and used for being connected with the main body unit through bolts, and grooves are formed in two sides of the linear track and used for the concave sliding blocks to slide up and down in the linear track; the concave slider is in threaded connection with the upper and lower polish rods, four threaded through holes are formed in the concave part in the middle of the concave slider and are fixedly connected with the linear track through bolts, and two threaded through holes are formed in the bottom of the concave slider.
6. The multi-point corrosion calibration device for the steel bars suitable for the built-in magnetic sensor as claimed in claim 1 or 2, wherein the first fixing unit comprises a first circular arc fixing clamp, a first screw rod and a first locking nut; the left side and the right side of the first circular arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the upper polish rod and the lower polish rod, and the fixing surface is provided with a threaded hole for fixing with the main body unit; the first screw rod is connected with the first locking nut bolt through the threaded hole, and the first arc-shaped fixed clamp fixing surface and the first screw rod are in close contact with the left and right surfaces of the upper and lower polish rods.
7. The multi-point corrosion calibration device for the steel bars suitable for the built-in magnetic sensor as claimed in claim 1 or 2, wherein the second fixing unit comprises a second circular arc fixing clamp, a second screw rod and a second locking nut; the left side and the right side of the second arc-shaped fixing clamp are respectively provided with a fixing surface and a threaded hole for fixing the steel bar to be calibrated, and the fixing surface is provided with a threaded hole for fixing with the main body unit; the second screw rod is connected with a second locking nut through the threaded hole, and the fixing surface of the second arc-shaped fixing clamp and the second screw rod are in close contact with the left surface and the right surface of the steel bar to be calibrated.
8. The multi-point corrosion calibration device for the built-in magnetic sensor for the steel bars as claimed in claim 5, wherein the upper and lower polish rods are provided with scales.
9. The multi-point corrosion calibration device for the steel bars of the built-in magnetic sensor as claimed in claim 5, wherein the linear rail is made of chromium bearing steel, and grooves are formed on two sides of the linear rail for the concave sliding block to slide up and down inside.
10. The device for calibrating the multi-point corrosion of the steel bars suitable for the built-in magnetic sensor as claimed in claim 5, wherein the concave slider has a smooth surface, the inside of the slider is provided with a groove for connecting with the linear rail, the outside of the slider is provided with a groove for ensuring that the magnetic sensor is embedded into the concave slider, and the bottom of the slider is provided with a threaded through hole for fixing with the built-in magnetic sensor.
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