Special sample rod for testing circumferential difference of automatic magnetic flux leakage equipment

Abstract

The utility model relates to the technical field of nondestructive testing, and discloses a special sample rod for testing circumferential difference of automatic magnetic flux leakage equipment, which comprises a sample rod body, a plurality of standard artificial groove injuries are distributed in the circumferential direction of the sample rod body at equal angles, and a plurality of standard artificial groove injuries are distributed around the circumferential direction of the sample rod body. A gap is formed between every two adjacent standard artificial groove injuries in the length direction of the sample rod body, and any two standard artificial groove injuries are not overlapped on the same circumferential surface. The device has the advantages that the sample rod does not need to be rotated by personnel, the testing time is shortened, the angle difference value among a plurality of standard manual groove injuries is fixed, and data errors caused by rotation of the personnel are avoided. Tiny intervals are arranged between adjacent standard artificial groove injuries along the length direction of the sample rod body, so that the test data of the magnetic flux leakage equipment can be conveniently extracted.

Description

Technical Field

[0001] The utility model relates to the technical field of nondestructive testing, in particular to a special sample rod for circumferential difference testing of automated magnetic flux leakage equipment. Background Art

[0002] The magnetic flux leakage testing method is a continuation of magnetic particle testing. The two methods share the same principle, that is, when the ferromagnetic material is fully magnetized, the magnetic lines of force are blocked by defects on its surface or near the surface, and the magnetic lines of force at the defects are distorted. Some of the magnetic lines of force leak out of the material surface, forming a leakage magnetic field. The magnetic flux leakage equipment detects the leakage magnetic field through a rotating probe, converts the leakage magnetic signal into an electrical signal, and clearly displays the defect size, location, and depth on the screen.

[0003] The FOERSTER RO 130 equipment in the prior art is mainly used to detect surface cracks on rolled round bars, and to evaluate the depth, location and quantity of the defects based on the data obtained from the detection to determine whether they meet customer needs.

[0004] An important parameter for calibrating the magnetic flux leakage equipment during the production process is the circumferential difference, that is, whether the magnetic flux leakage equipment consistently identifies the same depth defects in each angular direction of the tested bar. The current method for testing the circumferential difference accuracy of the magnetic flux leakage equipment is to use a sample bar with a 15*0.1*0.3mm (length*width*depth) standard defect for testing. The test method is to rotate the sample bar 45° each time, record the amplitude data after each rotation, and finally obtain the amplitude data of eight angles of 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°, and then calculate the circumferential difference of the equipment according to the formula. The above test method requires the sample bar to be rotated 7 times, which is long and inefficient; and the angle of each manual rotation is not consistent, and the data obtained is biased. Summary of the invention

[0005] The utility model aims to overcome the deficiencies of the above prior art and provides a special sample rod for circumferential difference testing of automated magnetic flux leakage equipment which has a simple structure and effectively improves detection efficiency and accuracy.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A special sample rod for circumferential difference testing of automated magnetic flux leakage equipment comprises a sample rod body, wherein a plurality of standard artificial groove defects are distributed equiangularly in the circumference of the sample rod body, and there is a gap between each two adjacent standard artificial groove defects along the length direction of the sample rod body around the circumference of the sample rod body, and any two of the standard artificial groove defects do not overlap on the same circumferential surface.

[0008] Furthermore, the standard artificial groove is a rectangular groove, and the center line of the standard artificial groove in the length direction is parallel to the axis of the sample rod body.

[0009] Furthermore, the length, width and depth dimensions of the standard artificial groove are 15*0.1*0.3 mm.

[0010] Furthermore, the number of the standard artificial groove injuries is at least eight.

[0011] Furthermore, along the length direction of the sample rod body, the interval between each two adjacent standard artificial grooves along the length direction of the sample rod body is 20 to 60 mm.

[0012] Furthermore, the number of the standard artificial grooves is eight, and the eight standard artificial grooves are distributed at equal angles along the circumference of the sample rod body, and the interval between adjacent standard artificial grooves along the length direction of the sample rod body is 50 mm.

[0013] Furthermore, the number of the standard artificial grooves is ten, the ten standard artificial grooves are distributed at equal angles along the circumference of the sample rod body, and the interval between adjacent standard artificial grooves along the length direction of the sample rod body is 20 to 50 mm.

[0014] Furthermore, the sample rod body is a solid structure.

[0015] Furthermore, the length of the sample rod body is at least 3000 mm, and the diameter of the sample rod body is 50-100 mm.

[0016] The utility model has the following advantages over the prior art:

[0017] 1. The utility model is a special sample rod for circumferential difference testing of the automated magnetic flux leakage equipment, and a plurality of standard artificial grooves are arranged at equal angles in the circumference of the sample rod body. During the test, the utility model can measure the standard damage amplitude data at multiple angles at one time by using the special sample rod for circumferential difference testing of the automated magnetic flux leakage equipment. There is no need for personnel to rotate the sample rod to reduce the test time, and the angle difference between the plurality of standard artificial grooves is constant, thus avoiding data errors caused by personnel rotation. Around the circumference of the sample rod body, a small interval is arranged between adjacent standard artificial grooves along the length direction of the sample rod body, and any two of the standard artificial grooves do not overlap on the same circumferential surface. This arrangement ensures the comprehensiveness and accuracy of the test data extracted by the magnetic flux leakage equipment.

[0018] 2. The utility model of the special sample rod for circumferential difference test of the automatic magnetic leakage equipment has eight standard artificial groove defects of the same size arranged at equal angles along the circumference, which can measure the standard defect amplitude data of eight angles at one time to calculate the circumferential difference. Using this sample rod, the test does not require personnel to rotate the sample rod to reduce the test time, and the standard defect amplitude data of eight angles can be measured at one time. In addition, the artificial defect angle difference of this sample rod is constant, which avoids data deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 It shows a front view of a special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to Example 1 of the utility model;

[0021] Figure 2 A side view of a special sample rod for circumferential difference testing of an automated magnetic flux leakage device according to Embodiment 1 of the present utility model is shown;

[0022] In the figure, 1 is the sample rod body; 2 is the standard artificial groove injury. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, it should be understood that for the convenience of description, the sizes of various components shown in the drawings are not drawn according to the actual proportional relationship.

[0026] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not need to be further discussed and described in detail in the description of the subsequent drawings.

[0027] Embodiment 1:

[0028] like Figure 1 and Figure 2 As shown, the present invention provides a special sample rod for circumferential difference test of automated magnetic flux leakage equipment, including a sample rod body 1, and a plurality of standard artificial groove defects 2 are distributed at equal angles in the circumference of the sample rod body 1. Through this setting, the sample rod can be used to measure the standard defect amplitude data of multiple angles at one time, without the need for personnel to rotate the sample rod, thereby reducing the test time, and the angle difference between the plurality of standard artificial groove defects is constant, thereby avoiding data errors caused by personnel rotation. Around the circumference of the sample rod body, there is a small interval between each two adjacent standard artificial groove defects along the length direction of the sample rod body, and any two standard artificial groove defects do not overlap on the same circumferential surface. In specific operation, when multiple standard artificial groove defects 2 are located on the same circumferential surface, the magnetic flux leakage equipment can only read the highest value, so a small interval is set between the standard artificial groove defects to improve the comprehensiveness and accuracy of the test data.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, the number of standard artificial grooves 2 is eight, and the eight standard artificial grooves 2 are distributed at equal angles along the circumference of the sample rod body, the angle between adjacent standard artificial grooves 2 is 45°, the interval between adjacent standard artificial grooves 2 along the length direction of the sample rod body is 50 mm, and any two of the eight standard artificial grooves 2 do not overlap on the same circumferential surface. In actual use, as the number of standard artificial grooves 2 increases, the accuracy of the test data will increase, but the number of standard artificial grooves 2 should not be too large, and the test process can have a certain degree of accuracy.

[0030] What needs to be determined is that the standard artificial grooves 2 are distributed at equal angles along the circumference of the sample rod body, and a small interval is set between adjacent standard artificial grooves 2 along the length direction of the sample rod body, and any two standard artificial grooves do not overlap on the same circumferential surface.

[0031] The standard artificial groove 2 described in this embodiment is a rectangular groove, and its length, width and depth are 15*0.1*0.3mm. The center line of the length direction of the standard artificial groove 2 is parallel to the axis of the sample rod body 1, that is, the rectangular artificial groove injury opened in the sample body 1 is not tilted. The center line of the length direction of the standard artificial groove 2 is parallel to the axis of the sample rod body 1 mainly to simulate the real crack orientation, and it is perpendicular to the magnetic field generated by the leakage magnetic device to generate the maximum leakage magnetic field for easy detection, while reducing the measurement error of the data. The size and slotting direction of the standard artificial groove injury are the same as the standard injury size in the prior art, meeting the applicability of the existing equipment. Specifically, when the size of the artificial groove required for the leakage magnetic device test changes, the size of the standard artificial groove injury also changes. The sample rod body is a solid structure (simulating a round bar that needs to be tested for surface cracks), and the size of the sample rod body is matched with the leakage magnetic device. In this embodiment, the length of the sample rod body is 3000mm, and the diameter of the sample rod body is 50mm. In actual use, the size of the sample rod body is determined according to the size of the magnetic flux leakage device. For example, the length of the sample rod body can be 4000 mm, 5000 mm, etc., and the diameter of the sample rod body can be 60 mm, 80 mm, 100 mm, etc.

[0032] When used specifically:

[0033] The special sample rod for circumferential difference test of this automated magnetic flux leakage equipment is installed on the magnetic flux leakage equipment. The rotating probe of the magnetic flux leakage equipment detects the leakage magnetic field of the sample rod, and converts the leakage magnetic signal into an electrical signal to clearly display the defect size and position on the screen. By reading the size of each defect, the accuracy of the circumferential difference test of the magnetic flux leakage equipment can be calibrated.

[0034] Embodiment 2:

[0035] This embodiment is the same as Embodiment 1 except for the following technical features:

[0036] In this embodiment, the number of standard artificial grooves is ten, the angle between adjacent standard artificial grooves is 36°, and the interval between adjacent standard artificial grooves along the length direction of the sample rod body is 20 mm. Specifically, this interval can also be 30 mm, 40 mm, or 50 mm.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special sample rod for circumferential difference test of automated magnetic flux leakage equipment, characterized in that: It comprises a sample rod body, on which a plurality of standard artificial grooves are distributed at equal angles in the circumference. Around the circumference of the sample rod body, there is a gap between each two adjacent standard artificial grooves along the length direction of the sample rod body, and any two standard artificial grooves do not overlap on the same circumferential surface.

2. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 1, characterized in that: The standard artificial groove is a rectangular groove, and the center line of the groove in the length direction is parallel to the axis of the sample rod body.

3. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 2, characterized in that: The length, width and depth dimensions of the standard artificial groove injury are 15*0.1*0.3 mm.

4. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 1, characterized in that: The number of the standard artificial groove injuries is at least eight.

5. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 4, characterized in that: Along the length direction of the sample rod body, the interval between each two adjacent standard artificial grooves along the length direction of the sample rod body is 20 to 60 mm.

6. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 1, characterized in that: The number of the standard artificial grooves is eight, and the eight standard artificial grooves are distributed at equal angles along the circumference of the sample rod body. The interval between adjacent standard artificial grooves along the length direction of the sample rod body is 50 mm.

7. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 1, characterized in that: The number of the standard artificial grooves is ten, and the ten standard artificial grooves are distributed at equal angles along the circumference of the sample rod body. The interval between adjacent standard artificial grooves along the length direction of the sample rod body is 20 to 50 mm.

8. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to any one of claims 1 to 7, characterized in that: The sample rod body is a solid structure.

9. The special sample rod for circumferential difference test of automated magnetic flux leakage equipment according to claim 8, characterized in that: The length of the sample rod body is at least 3000 mm, and the diameter of the sample rod body is 50-100 mm.

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