Magnetic type ultrasonic probe for measuring elongation of coupling bolt

Abstract

The utility model provides a magnetic type ultrasonic probe for measuring the elongation of a coupling bolt, which comprises an ultrasonic cable joint, the ultrasonic cable joint is provided with a middle probe, one end of the middle probe is fixed in a mounting hole of a shell of the ultrasonic probe, the middle probe is connected with the front side of a piezoelectric wafer through a lead, and the piezoelectric wafer is connected with the ultrasonic cable joint. A piezoelectric wafer is arranged in the ultrasonic probe shell, the reverse side of the piezoelectric wafer is adhered to a metal protective film, an annular magnet is arranged on the outer side of the piezoelectric wafer, the interior of the ultrasonic probe shell is filled with an insulating backing material, the bottom end of the annular magnet is adhered to the metal protective film, and a fixing rod is arranged in the center of the metal protective film. According to the utility model, the technical problem of tedious measurement of the elongation of the coupling bolt is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic nondestructive testing, in particular to a magnetic suction type ultrasonic probe used for measuring the elongation of a coupling bolt. Background Art

[0002] In the structure of a hydro-turbine generator set, the coupling bolts at various locations on the main shaft play an important role in connecting flanges and stabilizing the axis centerline. To achieve the tightening and disassembly of large coupling bolts, a special tensioner is required, and the change in the elongation of the coupling bolts during the stretching process is monitored in real time to determine whether they are tightened in place. The existing method for measuring the bolt elongation value is generally the dial indicator measurement method. This method sets up a dial indicator and records the pointer deflection value to obtain the magnitude of the elongation value. However, due to the inevitable mechanical vibration and jitter during the stretching process, a systematic error is introduced into the measurement result. The ultrasonic measurement system has the characteristics of simple structure, fast and convenient measurement process, and high precision. It has good engineering application prospects in the measurement of the elongation of large bolts. In order to meet the actual application scenario of the elongation measurement of specific coupling bolts on site of the hydro-turbine generator set, it is necessary to design a detection probe that can be better applied to the production site.

[0003] Therefore, there is an urgent need for a magnetic ultrasonic probe for measuring the elongation of a coupling bolt to solve the above problem. Summary of the invention

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a magnetic ultrasonic probe for measuring the elongation of a coupling bolt to solve the problems raised in the background technology.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a magnetic ultrasonic probe for measuring the elongation of a coupling bolt, comprising an ultrasonic cable joint, wherein the ultrasonic cable joint is provided with an intermediate probe, one end of which is fixed in a mounting hole of an ultrasonic probe housing, the intermediate probe is connected to the front side of a piezoelectric chip through a wire, the back side of the piezoelectric chip is adhered to a metal protective film, an annular magnet is provided on the outside of the piezoelectric chip, the inside of the ultrasonic probe housing is filled with an insulating backing material, the bottom end of the annular magnet is adhered to the metal protective film, and a fixing rod is provided at the center of the metal protective film.

[0006] Preferably, the diameter of the ultrasonic probe housing is not less than 1 / 3 of the nominal diameter of the bolt to be measured and not greater than 2 / 3 of the nominal diameter of the bolt to be measured, and the ultrasonic probe housing is made of a hard conductive material.

[0007] Preferably, the ultrasonic probe housing and the ultrasonic cable connector are bonded together using conductive glue.

[0008] Preferably, the piezoelectric chip and the metal protective film are bonded together using conductive adhesive, and a hole for a fixing rod to pass through is provided in the center of the piezoelectric chip.

[0009] Preferably, a hole for the fixing rod to pass through is opened in the center of the metal protective film, and the metal protective film is made of hard conductive material.

[0010] Preferably, the ultrasonic cable connector can use a Q9 interface.

[0011] Preferably, the insulating backing material can be epoxy resin material.

[0012] Preferably, the fixing rod has a diameter of 11 mm and a length of 100 mm.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model is suitable for the actual application scenario of measuring the elongation of specific coupling bolts on site of a hydro-turbine generator set. It has the characteristics of simple structure, fast and convenient measurement process, high precision, etc., and has good engineering application prospects in the elongation measurement of large bolts. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 This is an exploded view of the structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0019] See also Figures 1 to 3 A magnetic ultrasonic probe for measuring the elongation of a coupling bolt comprises an ultrasonic cable connector 1, wherein the ultrasonic cable connector 1 is provided with an intermediate probe 1.1, one end of which is fixed in a mounting hole 2.1 of an ultrasonic probe housing 2, wherein the intermediate probe 1.1 is connected to the front of a piezoelectric chip 3 through a wire, and the back of the piezoelectric chip 3 is pasted to a metal protective film 4, an annular magnet 5 is provided on the outside of the piezoelectric chip 3, the inside of the ultrasonic probe housing 2 is filled with an insulating backing material 6, the bottom end of the annular magnet 5 is pasted on the metal protective film 4, and a fixing rod 7 is provided at the center of the metal protective film 4.

[0020] Preferably, the diameter of the ultrasonic probe housing 2 is not less than 1 / 3 of the nominal diameter of the bolt to be measured and not greater than 2 / 3 of the nominal diameter of the bolt to be measured, and the ultrasonic probe housing 2 is made of a hard conductive material.

[0021] Preferably, the connection between the ultrasonic probe housing 2 and the ultrasonic cable connector 1 is bonded with conductive adhesive to ensure good contact conductivity.

[0022] Preferably, the piezoelectric chip 3 and the metal protective film 4 are bonded with conductive adhesive, and a first through hole 3.1 is provided in the center of the piezoelectric chip 3 for the fixing rod 7 to pass through, so as to ensure good contact conductivity.

[0023] Preferably, a second through hole 4.1 for the fixing rod 7 to pass through is opened in the center of the metal protective film 4, and the metal protective film 4 is made of hard conductive material.

[0024] Preferably, the ultrasonic cable connector 1 can use a Q9 interface. The ultrasonic cable connector 1 can use a standard interface such as Q6, Q9, C9, SMA, etc.

[0025] Preferably, the insulating backing material 6 can be made of epoxy resin material. The insulating backing material 6 can be made of epoxy resin, thermosetting adhesive and other materials.

[0026] Preferably, the fixing rod 7 has a diameter of 11 mm and a length of 100 mm, its diameter is consistent with the center hole of the coupling bolt, and its length is less than the depth of the center hole of the bolt.

[0027] The working principle of this embodiment is as follows:

[0028] During measurement, the fixing rod is inserted into the center hole of the bolt to be measured, and the device can be fixed on the coupling bolt to be measured through the annular magnet. The ultrasonic measurement system is connected through the ultrasonic cable connector to detect and calculate the bolt elongation.

[0029] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A magnetic ultrasonic probe for measuring the elongation of a coupling bolt, comprising an ultrasonic cable connector (1), characterized in that: The ultrasonic cable connector (1) is provided with an intermediate probe (1.1) having one end fixed in a mounting hole (2.1) of an ultrasonic probe housing (2); the intermediate probe (1.1) is connected to the front side of a piezoelectric chip (3) via a wire; the back side of the piezoelectric chip (3) is adhered to a metal protective film (4); an annular magnet (5) is provided on the outside of the piezoelectric chip (3); the inside of the ultrasonic probe housing (2) is filled with an insulating backing material (6); the bottom end of the annular magnet (5) is adhered to the metal protective film (4); and a fixing rod (7) is provided at the center of the metal protective film (4).

2. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 1, characterized in that: The diameter of the ultrasonic probe housing (2) is not less than 1 / 3 of the nominal diameter of the bolt to be measured and not greater than 2 / 3 of the nominal diameter of the bolt to be measured, and the ultrasonic probe housing (2) is made of a hard conductive material.

3. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 2, characterized in that: The ultrasonic probe housing (2) and the ultrasonic cable connector (1) are bonded together using conductive glue.

4. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 1, characterized in that: The piezoelectric chip (3) and the metal protective film (4) are bonded together using conductive adhesive, and a first through hole (3.1) for a fixing rod (7) to pass through is provided at the center of the piezoelectric chip (3).

5. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 1, characterized in that: A second through hole (4.1) for the fixing rod (7) to pass through is provided at the center of the metal protective film (4), and the metal protective film (4) is made of a hard conductive material.

6. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 1, characterized in that: The ultrasonic cable connector (1) may use a Q9 interface.

7. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 1, characterized in that: The insulating backing material (6) may be made of epoxy resin material.

8. The magnetic ultrasonic probe for measuring the elongation of a coupling bolt according to claim 1, characterized in that: The fixing rod (7) has a diameter of 11 mm and a length of 100 mm.

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