Constant-force self-suction ultrasonic thickness gauge probe

Abstract

The utility model relates to a probe of a constant-force self-suction type ultrasonic thickness gauge, which is characterized in that ultrasonic waves emitted by the probe are reflected back on the bottom surface of a workpiece and received by the probe, and the thickness of the workpiece is obtained by accurately measuring the propagation time of the ultrasonic waves in a material through a counter, and consists of the probe and a silica gel sucking disc arranged on the probe, and threads are designed on the silica gel sucking disc. The suction cup is installed by being connected with threads on the probe in a screwed mode, the end face of the silica gel suction cup is 0.5 mm higher than the end face of the probe so that it can be guaranteed that the suction cup has enough adsorption space, it can be guaranteed that 20-30 N pressure is applied to the probe, the suction cup can be used for magnetic and non-magnetic materials, and constant pressure is provided between the probe of the ultrasonic thickness gauge and a measured workpiece. Therefore, measurement errors caused by the coupling layer are reduced, the measurement precision is ensured, and the device has the advantages of simple structure and convenience in use.

Description

Technical Field

[0001] This utility model belongs to the field of ultrasonic material thickness testing technology, specifically relating to a constant force self-absorption ultrasonic thickness gauge probe that relies on the ultrasonic waves emitted by the probe to be reflected back from the bottom surface of the workpiece and received by the probe, and uses a counter to accurately measure the propagation time of the ultrasonic waves in the material to obtain the thickness of the workpiece. It can be used for both magnetic and non-magnetic materials. Background Technology

[0002] Ultrasonic thickness measurement is a method for inspecting and testing internal defects such as thinning, delamination, unevenness, and abnormalities in workpieces without affecting their performance or damaging their internal structure. It is widely used as a routine non-destructive testing method due to its advantages of simple operation and high speed. The principle is that the instrument emits ultrasonic waves through a probe, which are reflected back to the bottom surface of the workpiece and received by the probe. The thickness of the workpiece is determined by accurately measuring the propagation time of the ultrasonic waves in the material using a counter. GB / T11344-2021, "Ultrasonic Thickness Measurement for Non-destructive Testing," clearly specifies the pressure requirements for the probe during ultrasonic thickness measurement: when the probe contacts the specimen, a pressure of (20-30) N should be applied to the probe to ensure good coupling between the probe and the specimen, and to eliminate excess coupling agent, forming an extremely thin layer of coupling agent on the measuring surface. This reduces the time it takes for the sound waves to pass through the coupling layer and improves measurement accuracy. Currently, most thickness gauge probes lack any device to control the applied pressure. Some probes are equipped with spring devices, which control the pressure value by compressing the spring, but this makes it difficult to control the applied pressure and may lead to excessive pressure causing probe wear. Some probes are equipped with ring-shaped neodymium iron boron magnets, which are simple and easy to operate, but cannot meet the requirements for measuring the thickness of non-magnetic materials. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a constant force self-priming ultrasonic thickness gauge probe that is simple in structure and easy to use. It can provide a constant pressure between the ultrasonic thickness gauge probe and the workpiece being measured, so as to reduce the measurement error caused by the coupling layer and ensure measurement accuracy.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A constant-force self-adhesive ultrasonic thickness gauge probe includes a probe and a silicone suction cup mounted thereon. The silicone suction cup and the probe are connected together by a threaded connection, thus completing the installation of the silicone suction cup on the probe. The end face of the silicone suction cup is 0.5mm higher than the end face of the probe to ensure that the suction cup has sufficient adsorption space and to ensure that a constant pressure is applied to the probe. The probe is pressed against the position on the surface of the workpiece to be measured where the coupling agent is applied, and the silicone suction cup is adsorbed at the measured position. Under the action of adsorption force, the probe is constantly self-adsorbed on the surface of the workpiece to be measured. At this time, the value displayed by the ultrasonic thickness gauge is read to complete the measurement of the workpiece thickness.

[0005] The silicone suction cup ensures that the pressure of the probe on the surface of the workpiece being tested is in the range of 20 to 30 N.

[0006] The significant advantages of this invention are: it solves the problem of achieving a constant suction force between the probe and the workpiece when measuring thickness of non-magnetic materials, which meets the requirements of GB / T11344-2021 "Nondestructive Testing - Ultrasonic Thickness Measurement", reduces measurement errors caused by the coupling layer, and improves measurement accuracy. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of this utility model.

[0008] In the diagram: 1. Ultrasonic thickness gauge; 2. Probe; 3. Silicone suction cup; 4. Thread. Detailed Implementation

[0009] Example 1: As Figure 1 As shown, a constant force self-priming ultrasonic thickness gauge probe consists of a probe 2 and a silicone suction cup 3 mounted on it. The probe 2 is mounted on the ultrasonic thickness gauge 1. The silicone suction cup 3 is screwed onto the probe 2 using a thread 4 to complete the installation of the suction cup 3. The end face of the silicone suction cup 3 should be 0.5mm higher than the end face of the probe to ensure that the suction cup 3 has sufficient adsorption space when subjected to force and to ensure that a pressure of (20~30)N is applied to the probe 2.

[0010] When using, select silicone suction cup 2 that meets the following requirements:

[0011] Adsorption force F = S × P / µ ≈ (20~30) N

[0012] In the formula: F: the adsorption force of the silicone suction cup on the workpiece being inspected, in N; S: the area of ​​the silicone suction cup, in cm². 2 P: Atmospheric pressure, unit: kg / cm² 2 µ: safety factor, usually taken as 2.5. A silicone suction cup that satisfies the above relationship can achieve a constant pressure of (20~30) N between the probe and the workpiece being inspected.

[0013] Connect the silicone suction cup 3 to the probe 2 via the thread 4. Adjust the position of the silicone suction cup 2 so that its end face is 0.5mm higher than the end face of the probe 2. Prepare the surface of the workpiece to be inspected, ensuring it is clean, free of rust, oil, and any deposits that may affect the inspection, and meets the roughness requirements. According to the instrument's instruction manual, select appropriate material sound velocity and standard test blocks to calibrate the ultrasonic thickness gauge 1, ensuring its ultrasonic wave transmission and reception performance is at its best to improve measurement accuracy. Then, apply a coupling agent to the workpiece. Press the probe 2 onto the surface of the workpiece, and attach the suction cup 3 to the measurement position. Under the action of the suction force, the probe 2 will self-adhere to the surface of the workpiece. At this point, read the value displayed on the ultrasonic thickness gauge 1 to complete the workpiece thickness measurement.

Claims

1. A constant force self-suction ultrasonic thickness gauge probe, comprising a probe (2) and a silica gel suction cup (3) mounted thereon, characterized in that: Silica gel suction disc (3) and probe (2) are connected together by screw thread (4), complete silica gel suction disc (3) installation on probe (2), and the end face of silica gel suction disc (3) is 0.5mm higher than the end face of probe (2), to ensure that the suction disc has enough adsorption space, and ensure that the probe applies constant pressure; Probe (2) is pressed on the position of the measured workpiece surface coated with coupling agent and adsorbs silica gel suction disc (3) at the measured position, probe (2) is self-absorbed on the measured workpiece surface under the action of adsorption force, at this time the display value of ultrasonic thickness gauge (1) is read, and the measurement of workpiece thickness is completed.

2. The constant force self-priming ultrasonic thickness gauge probe of claim 1, wherein: The silica gel suction disc (3) ensures that the pressure range of the probe (2) on the surface of the measured workpiece is 20-30N.

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