Electromagnetic ultrasonic transverse and longitudinal wave probe for pretightening force measurement

Abstract

The utility model discloses an electromagnetic ultrasonic transverse and longitudinal wave probe for pretightening force measurement, which comprises a shell, an upper cover, and a wear-resistant layer, a coil, a sound insulation layer, a magnet and a circular magnetic conductive block which are arranged in the shell, the upper part of the shell is provided with an upper end opening, the lower part of the shell is provided with a lower end detection port, and the upper cover is covered in the upper end opening; a wire clamp is arranged on the outer side face of the shell, and a probe wire is arranged in the wire clamp. The device is characterized in that the magnet is an annular magnet with magnetic lines evenly radiated from the inner diameter to the outer diameter, the wear-resistant layer, the coil, the sound insulation layer, the annular magnet and the circular magnetic conductive block are sequentially arranged in the shell from bottom to top, the wear-resistant layer, the coil, the sound insulation layer and the circular magnetic conductive block are all coaxially arranged with the annular magnet, the wear-resistant layer is located in the lower end detection port, and the sound insulation layer is located in the lower end detection port. The lower surface of the circular magnetic conductive block is positioned on the upper surface of the annular magnet; a gap is formed between the inner wall of the shell and the outer wall of the annular magnet, a lead is arranged in the gap, and the probe wire is electrically connected with the coil through the lead.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic ultrasound for measuring preload force, in particular to an electromagnetic ultrasound transverse and longitudinal wave probe for measuring preload force. Background Art

[0002] The magnets of current electromagnetic ultrasonic transverse and longitudinal wave probes are usually designed to be axially magnetized. The axial magnetic field of the magnet excites transverse waves, and the radial magnetic field excites longitudinal waves. Although this magnetization direction can satisfy the excitation of transverse waves and longitudinal waves for most hexagonal bolts with large contact surfaces, it can meet the requirements of preload measurement. However, axial magnetization results in a very weak horizontal magnetic field and relatively weak longitudinal waves. If the end face of the bolt is a hexagonal bolt, the effective electromagnetic induction end face becomes smaller, causing the intensity of the excited longitudinal wave to weaken, and the longitudinal wave cannot be effectively received, resulting in poor results in measuring the bolt preload, or even inability to measure. Utility Model Content

[0003] The problem to be solved by the utility model is to provide an electromagnetic ultrasonic transverse and longitudinal wave probe for measuring preload force. The electromagnetic ultrasonic transverse and longitudinal wave probe for measuring preload force can improve the conversion efficiency of electromagnetic ultrasound exciting transverse waves and longitudinal waves at the bolt end face at the same time, thereby improving the effect of measuring the bolt preload force.

[0004] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0005] An electromagnetic ultrasonic transverse and longitudinal wave probe for measuring preload force comprises a shell and an upper cover, as well as a wear-resistant layer, a coil, a sound insulation layer, a magnet and a circular magnetic conductive block arranged in the shell, wherein the upper part of the shell is provided with an upper end opening, the lower part of the shell is provided with a lower end detection port, and the upper cover is closed in the upper end opening; a wire clamp is provided on the outer side surface of the shell, and a probe wire is provided in the wire clamp; the characteristic is that: the magnet is an annular magnet whose magnetic lines of force radiate uniformly from the inner diameter to the outer diameter, the wear-resistant layer, the coil, the sound insulation layer, the annular magnet and the circular magnetic conductive block are arranged in the shell from bottom to top in sequence, the wear-resistant layer, the coil, the sound insulation layer and the circular magnetic conductive block are all arranged coaxially with the annular magnet, the wear-resistant layer is in the lower end detection port, and the lower surface of the circular magnetic conductive block is on the upper surface of the annular magnet; a gap is provided between the inner wall of the shell and the outer wall of the annular magnet, a lead wire is provided in the gap, and the probe wire is electrically connected to the coil through the lead wire.

[0006] The gap between the inner wall of the shell and the outer wall of the annular magnet is used to place the lead wire, which connects the coil to the external signal processing equipment to realize signal transmission. When the electromagnetic ultrasonic transverse and longitudinal wave probe is used to measure the preload force close to the bolt, the coil generates an alternating magnetic field after being energized. The alternating magnetic field interacts with the static magnetic field generated by the annular magnet to generate a Lorentz force, which in turn excites ultrasonic waves on the surface of the bolt. Since the magnetic lines of force of the annular magnet are uniformly radiated from the inner diameter to the outer diameter, the radial magnetic field generated by the annular magnet is stronger and can effectively excite longitudinal waves in the bolt, while the axial magnetic field generated by the annular magnet is weaker, which helps to reduce the interference of transverse waves and improve the excitation effect of longitudinal waves. This design is particularly suitable for bolts with hollow end faces, such as hexagon socket bolts, because the radial magnetic field can produce a stronger excitation effect on a smaller contact surface.

[0007] When the probe directly contacts the end face of the bolt, the wear-resistant layer is used to protect the internal structure of the electromagnetic ultrasonic transverse and longitudinal wave probe from being damaged.

[0008] The circular magnetic conductive block is located on the upper surface of the annular magnet, which can concentrate and optimize the distribution of the magnetic field, making the interaction between the alternating magnetic field generated by the coil and the static magnetic field more efficient, which not only enhances the excitation effect of the longitudinal wave, but also improves the excitation effect of the transverse wave, thereby improving the utilization rate of the magnetic field.

[0009] In the preferred embodiment, a magnetic column is provided at the center of the lower surface of the circular magnetic block, and the magnetic column is perpendicular to the lower surface of the circular magnetic block. A through hole is provided at the center of the annular magnet, and the magnetic column is in the through hole and is arranged coaxially with the annular magnet. The magnetic column can concentrate and guide the magnetic field, so that the distribution of the magnetic field on the end face of the bolt is more concentrated, and the excitation effect of the transverse wave and the longitudinal wave is improved. The length of the magnetic column can be adjusted to achieve the best conversion efficiency of the transverse wave and the longitudinal wave of the end faces of different hexagon socket bolts. When the length of the magnetic column is increased, the magnetic column can be made to penetrate deeper into the through hole of the annular magnet, the concentration of the magnetic field is enhanced, and the excitation effect of the longitudinal wave is improved, which is suitable for bolts with smaller end faces, such as hexagon socket bolts. When the length of the magnetic column is reduced, the distance between the magnetic column and the annular magnet can be increased, the concentration of the magnetic field is weakened, the strength of the axial magnetic field is increased, and the excitation effect of the transverse wave is improved, which is suitable for bolts with larger end faces.

[0010] In a preferred embodiment, the outer diameter of the sound insulation layer is greater than or equal to the outer diameter of the annular magnet. The outer diameter of the sound insulation layer is greater than or equal to the outer diameter of the annular magnet, which can ensure that the sound insulation layer completely covers the annular magnet, reduce the interference of the annular magnet on the alternating magnetic field generated by the coil, improve the signal quality and signal-to-noise ratio, and thus improve the precision and accuracy of the measurement.

[0011] In a further preferred embodiment, the sound insulation layer is made of a metal conductive material, which may be copper, aluminum alloy or iron.

[0012] In a preferred embodiment, the coil is an electromagnetic coil.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] This electromagnetic ultrasonic transverse and longitudinal wave probe for preload measurement can improve the conversion efficiency of electromagnetic ultrasound in simultaneously exciting transverse waves and longitudinal waves on the bolt end face, thereby improving the effect of measuring the bolt preload, especially in hexagon socket bolts, it can simultaneously excite effective transverse waves and longitudinal waves, and has high measurement precision and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0016] Figure 2 It is a structural schematic diagram of Embodiment 2 of the present utility model;

[0017] Figure 3 It is a structural schematic diagram of the circular magnetic conductive block and the magnetic conductive column in Example 2 of the utility model. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Embodiment 1, as Figure 1 As shown, the electromagnetic ultrasonic transverse and longitudinal wave probe for preload measurement in this embodiment includes a shell 1 and an upper cover 2, as well as a wear-resistant layer 3, a coil 4, a sound insulation layer 9, a magnet 5 and a circular magnetic conductive block 6 arranged in the shell 1. The upper part of the shell 1 is provided with an upper end opening, the lower part of the shell 1 is provided with a lower end detection port, and the upper cover 2 covers the upper end opening; a wire clamp 7 is provided on the outer surface of the shell 1, and a probe wire 8 is provided in the wire clamp 7; the magnet 5 is an annular magnet 5 whose magnetic lines of force radiate uniformly from the inner diameter to the outer diameter; the wear-resistant layer 3 is provided with a plurality of wires, and the plurality of wires are provided with a plurality of wires. , coil 4, sound insulation layer 9, annular magnet 5, and circular magnetic conductive block 6 are sequentially arranged in the shell 1 from bottom to top, the wear-resistant layer 3, coil 4, sound insulation layer 9, and circular magnetic conductive block 6 are all coaxially arranged with the annular magnet 5, the wear-resistant layer 3 is in the lower end detection port, and the lower surface of the circular magnetic conductive block 6 is on the upper surface of the annular magnet 5; a gap 11 is provided between the inner wall of the shell 1 and the outer wall of the annular magnet 5, a lead wire 12 is provided in the gap 11, and the probe wire 8 is electrically connected to the coil 4 through the lead wire 12.

[0020] The gap 11 between the inner wall of the shell 1 and the outer wall of the annular magnet 5 is used to place the lead 12, which connects the coil 4 to the external signal processing equipment to achieve signal transmission. When the electromagnetic ultrasonic transverse and longitudinal wave probe is used to measure the preload force close to the bolt, the coil 4 generates an alternating magnetic field after being energized. The alternating magnetic field interacts with the static magnetic field generated by the annular magnet 5 to generate a Lorentz force, which in turn excites ultrasonic waves on the surface of the bolt. Since the magnetic lines of force of the annular magnet 5 are uniformly radiated from the inner diameter to the outer diameter, the radial magnetic field generated by the annular magnet 5 is relatively strong and can effectively excite longitudinal waves in the bolt, while the axial magnetic field generated by the annular magnet 5 is relatively weak, which helps to reduce the interference of transverse waves and improve the excitation effect of longitudinal waves. This design is particularly suitable for bolts with hollow end faces, such as hexagon socket bolts, because the radial magnetic field can produce a stronger excitation effect on a smaller contact surface.

[0021] When the probe directly contacts the end face of the bolt, the wear-resistant layer is used to protect the internal structure of the electromagnetic ultrasonic transverse and longitudinal wave probe from being damaged.

[0022] The circular magnetic conductive block 6 is located on the upper surface of the annular magnet 5, which can concentrate and optimize the distribution of the magnetic field, making the interaction between the alternating magnetic field generated by the coil 4 and the static magnetic field more efficient, which not only enhances the excitation effect of the longitudinal wave, but also improves the excitation effect of the transverse wave, thereby improving the utilization rate of the magnetic field.

[0023] The outer diameter of the sound insulation layer 9 is greater than or equal to the outer diameter of the annular magnet 5. The outer diameter of the sound insulation layer 9 is greater than or equal to the outer diameter of the annular magnet 5, which can ensure that the sound insulation layer 9 completely covers the annular magnet 5, reduce the interference of the annular magnet 5 on the alternating magnetic field generated by the coil 4, improve the stability of the magnetic field, and also reduce the interference of external noise on the signal, improve the quality of the signal and the signal-to-noise ratio, thereby improving the precision and accuracy of the measurement.

[0024] The sound insulation layer 9 is made of a metallic conductive material.

[0025] The coil 4 is an electromagnetic coil 4 .

[0026] Embodiment 2, as Figure 2-3As shown, the difference between this embodiment and embodiment 1 is that: a magnetic column 61 is provided at the center of the lower surface of the circular magnetic block 6, and the magnetic column 61 is perpendicular to the lower surface of the circular magnetic block 6. A through hole 51 is provided at the center of the annular magnet 5, which passes through from top to bottom. The magnetic column 61 is in the through hole 51 and is arranged coaxially with the annular magnet 5. The magnetic column 61 can concentrate and guide the magnetic field, so that the distribution of the magnetic field on the end face of the bolt is more concentrated, and the excitation effect of the transverse wave and the longitudinal wave is improved. The length of the magnetic column 61 can be adjusted to achieve the best conversion efficiency of the transverse wave and the longitudinal wave of the end faces of different hexagon socket bolts. When the length of the magnetic column 61 is increased, the magnetic column 61 can be made to penetrate deeper into the through hole 51 of the annular magnet 5, thereby enhancing the concentration of the magnetic field and improving the excitation effect of the longitudinal wave. It is suitable for bolts with hollow end faces, such as hexagon socket bolts. When the length of the magnetic pole 61 is reduced, the distance between the magnetic pole 61 and the annular magnet 5 can be increased, the concentration of the magnetic field is weakened, the strength of the axial magnetic field is increased, and the excitation effect of the transverse wave is improved, which is suitable for bolts with larger end faces.

[0027] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The technical personnel of the technical field to which the utility model belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. An electromagnetic ultrasonic transverse and longitudinal wave probe for measuring preload force, comprising a shell and an upper cover, and a wear-resistant layer, a coil, a sound insulation layer, a magnet and a circular magnetic conductive block arranged in the shell, the upper part of the shell is provided with an upper end opening, the lower part of the shell is provided with a lower end detection port, and the upper cover is closed in the upper end opening; a wire clamp is provided on the outer surface of the shell, and a probe wire is provided in the wire clamp; the characteristics are: The magnet is an annular magnet whose magnetic lines of force radiate uniformly from the inner diameter to the outer diameter. The wear-resistant layer, coil, sound insulation layer, annular magnet and circular magnetic conductive block are arranged in the shell from bottom to top in sequence. The wear-resistant layer, coil, sound insulation layer and circular magnetic conductive block are all arranged coaxially with the annular magnet. The wear-resistant layer is in the lower end detection port, and the lower surface of the circular magnetic conductive block is on the upper surface of the annular magnet. There is a gap between the inner wall of the shell and the outer wall of the annular magnet, and a lead wire is arranged in the gap. The probe wire is electrically connected to the coil through the lead wire.

2. The electromagnetic ultrasonic transverse and longitudinal wave probe for preload force measurement according to claim 1, characterized in that: A magnetic column is provided at the center of the lower surface of the circular magnetic block, which is perpendicular to the lower surface of the circular magnetic block. A through hole is provided at the center of the annular magnet, which passes through the through hole. The magnetic column is located in the through hole and is coaxially arranged with the annular magnet.

3. The electromagnetic ultrasonic transverse and longitudinal wave probe for preload force measurement according to claim 1, characterized in that: The outer diameter of the sound insulation layer is greater than or equal to the outer diameter of the annular magnet.

4. The electromagnetic ultrasonic transverse and longitudinal wave probe for preload force measurement as claimed in claim 3, characterized in that: The sound insulation layer is made of conductive metal material.

5. The electromagnetic ultrasonic transverse and longitudinal wave probe for preload force measurement according to claim 1, characterized in that: The coil is an electromagnetic coil.

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