Transmitting transducer for detecting internal defects of non-metal medium

Abstract

The utility model relates to the technical field of ultrasonic transducers, and particularly discloses a transmitting transducer for detecting internal defects of non-metal media, which comprises an outer cylinder and a sealing cover cylinder spirally arranged at the top end of the outer cylinder, the outer cylinder is sequentially provided with a cavity A and a cavity B from top to bottom, a magnetic ring A is fixedly arranged at the bottom of the sealing cover cylinder, and a magnetic ring B is fixedly arranged at the bottom end of the cavity A; a piezoelectric ceramic piece is arranged on the magnetic ring B in a suspended mode, a magnetic ring C is arranged on the top of the piezoelectric ceramic piece, and a magnetic ring D is arranged at the bottom of the piezoelectric ceramic piece. According to the technical scheme, external high-voltage electric signals are received through the electrode A and the electrode B, so that the piezoelectric ceramic piece vibrates to emit ultrasonic waves for detecting internal defects of a non-metal medium, the magnetic ring A is matched with the magnetic ring B to suspend and install the piezoelectric ceramic piece in the cavity A, and the phenomenon of resonance caused by hard contact installation with an outer cylinder is avoided; therefore, aftershock after ultrasonic waves are emitted by the piezoelectric ceramic piece is greatly reduced, and the resolution ratio and the accuracy of ultrasonic detection are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic transducers, in particular to a transmitting transducer used for detecting internal defects of non-metallic media. Background Art

[0002] A short aftermath transmitting transducer is an ultrasonic transducer capable of emitting short aftermath waves. It is capable of rapidly generating high-intensity ultrasonic pulses in a short period of time. These short pulses help improve the resolution and accuracy of ultrasonic detection. Currently, common ultrasonic transmitting transducers use a high-voltage electrical signal applied to a piezoelectric ceramic to generate high-frequency ultrasonic waves. However, since the piezoelectric ceramic generates ultrasonic waves through its own high-frequency vibrations, the outer shell in which it is mounted can easily resonate. Aftershocks can also be transmitted to the piezoelectric ceramic, reducing the resolution and accuracy of ultrasonic detection. Publication number (CN102231273B) discloses a lead-free ultrasonic transducer and a radar ranging system incorporating the same. The transducer comprises: a housing defining a cavity and having a cover secured to its upper surface; a shock-absorbing layer disposed within the cavity to define a receiving chamber between the layer and the housing; and a piezoelectric ceramic disc disposed within the receiving chamber.

[0003] In the process of realizing the present utility model, the inventors discovered that at least the following problems exist in the prior art and have not been solved: the piezoelectric ceramic sheet of the above-mentioned transducer is fixed to the cavity inside the outer cylinder by bonding, and there is still a direct contact connection, which is easy to cause resonance, and aftershocks will be transmitted to the piezoelectric ceramic, resulting in reduced resolution and accuracy of ultrasonic detection. At the same time, the piezoelectric ceramic lacks external protection and is easily damaged, which requires improvement. Therefore, we propose an emitting transducer for internal defect detection of non-metallic media. Utility Model Content

[0004] The purpose of the utility model is to provide a transmitting transducer for detecting internal defects of non-metallic media, which solves the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: an emitting transducer for detecting internal defects of non-metallic media, comprising an outer cylinder and a covering cylinder spirally arranged on the top of the outer cylinder, the outer cylinder being provided with cavity A and cavity B from top to bottom, a magnetic ring A being fixedly arranged at the bottom of the covering cylinder, a magnetic ring B being fixedly arranged at the bottom end of cavity A, a piezoelectric ceramic piece being suspended above the magnetic ring B, a magnetic ring C having the same magnetic properties as the magnetic ring A being fixedly arranged on the top surface of the piezoelectric ceramic piece, a magnetic ring D having the same magnetic properties as the magnetic ring B being fixedly arranged on the bottom surface of the piezoelectric ceramic piece, an electrode A being connected to the bottom surface of the piezoelectric ceramic piece, and an electrode B being connected to the inner wall of the outer cylinder.

[0006] As a preferred implementation of the technical solution of the present application, the outer wall of the bottom end of the sealing cylinder is integrally formed with an external thread, and the top end of the inner wall of the cavity A is integrally formed with an internal thread engaged with the external thread.

[0007] As a preferred embodiment of the technical solution of the present application, a plurality of silicone balls are arranged around the circumferential surface of the piezoelectric ceramic piece. When the piezoelectric ceramic piece is embedded in the cavity A, the silicone balls are in close contact with the inner wall of the cavity A.

[0008] As a preferred implementation of the technical solution of the present application, a sealing cover is provided on the top of the sealing cylinder.

[0009] As a preferred implementation of the technical solution of the present application, the inner diameter of the cavity B is consistent with the inner diameter of the magnetic ring B.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] 1. The technical solution of the present application uses electrodes A and B to receive external high-voltage electrical signals to cause the piezoelectric ceramic piece to vibrate and emit ultrasonic waves, which are used for internal defect detection of non-metallic media. The piezoelectric ceramic piece is suspended and installed inside the cavity A by using magnetic ring A and magnetic ring B to avoid resonance caused by hard contact with the outer cylinder. The piezoelectric ceramic piece is in soft contact with the inner wall of the cavity A through the silicone ball, thereby greatly reducing the aftershocks after the piezoelectric ceramic piece emits ultrasonic waves, thereby improving the resolution and accuracy of ultrasonic detection.

[0012] 2. The technical solution of this application is to use a spiral combination of the sealing cylinder and the outer cylinder, which is not only used to limit the piezoelectric ceramic sheet, but also to seal and protect the top of the piezoelectric ceramic sheet, thereby extending the service life of the piezoelectric ceramic sheet. The spiral assembly method is used to facilitate the maintenance and replacement of components inside the outer cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0014] Figure 1 is an external stereoscopic diagram of the transmitting transducer;

[0015] Figure 2 Schematic diagram of the internal structure of the transmitting transducer;

[0016] Figure 3 It is a structural diagram of the capping cylinder;

[0017] Figure 4 Schematic diagram of the structure of a piezoelectric ceramic sheet;

[0018] Figure 5 It is a structural diagram of magnetic ring B.

[0019] In the figure: 1. Capping cylinder; 101. Sealing cap; 102. External thread; 103. Magnetic ring A; 2. External cylinder; 201. Cavity B; 202. Cavity A; 203. Internal thread; 3. Piezoelectric ceramic piece; 301. Silicone ball; 302. Magnetic ring C; 4. Magnetic ring B; 5. Electrode A; 6. Electrode B. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1, as Figure 1-5 As shown, the utility model provides a technical solution: an emitting transducer for detecting internal defects of non-metallic media, comprising an outer cylinder 2, a covering cylinder 1 spirally arranged on the top of the outer cylinder 2, the outer cylinder 2 having cavities A202 and cavity B201 from top to bottom, a magnetic ring A103 fixedly arranged at the bottom of the covering cylinder 1, a magnetic ring B4 fixedly arranged at the bottom end of the cavity A202, a piezoelectric ceramic piece 3 suspended above the magnetic ring B4, a magnetic ring C302 with the same magnetic properties as the magnetic ring A103 fixedly arranged on the top surface of the piezoelectric ceramic piece 3, a magnetic ring D with the same magnetic properties as the magnetic ring B4 fixedly arranged on the bottom surface of the piezoelectric ceramic piece 3, an electrode A5 connected to the bottom surface of the piezoelectric ceramic piece 3, and an electrode B6 connected to the inner wall of the outer cylinder 2.

[0022] In a specific embodiment of the present invention, electrode A5 and electrode B6 are connected to an excitation device, which generates a high-frequency, high-voltage electrical signal. The high-frequency, high-voltage electrical signal vibrates through the piezoelectric ceramic piece 3, thereby emitting an ultrasonic signal for detecting internal defects of the non-metallic medium. The magnetic ring B4 is fixed to the bottom of the inner wall of the cavity A202 by a colloid, and then the piezoelectric ceramic piece 3 is placed. The magnetic ring B4 has the same magnetic pole as the magnetic ring D at the bottom of the piezoelectric ceramic piece 3, which produces repulsion, so that the piezoelectric ceramic piece is magnetically suspended above the magnetic ring B4, and the silicone ball 301 is in contact with the inner wall of the cavity A202, thereby improving the stability of the piezoelectric ceramic piece 3. Then, the sealing tube 1 is screwed into the cavity A202, and the external thread 102 of the sealing tube 1 is engaged with the internal thread 203 in turn and pushed forward until the magnetic ring A103 is at the top of the piezoelectric ceramic piece 3. The magnetic ring C302 at the bottom generates repulsive resistance and stops the advancement of the capping tube 1. At this time, the magnetic ring A103 and the magnetic ring B4 both generate repulsive force on the piezoelectric ceramic piece 3, so that the piezoelectric ceramic piece 3 is always not in direct hard contact with the outer tube 2. Even if the piezoelectric ceramic piece 3 generates an ultrasonic signal through vibration, the vibration will not be transmitted to the outer tube 2. The short aftermath transmitting transducer needs to have the ability to quickly generate high-intensity ultrasonic pulses in a short time. When a high-intensity ultrasonic pulse is generated, the vibration intensity generated by the piezoelectric ceramic piece 3 increases. It is necessary to reduce the aftershocks after the piezoelectric ceramic piece 3 generates ultrasonic waves in order to improve the resolution and accuracy of ultrasonic detection. The silicone ball 301 makes the piezoelectric ceramic piece 3 in soft contact with the inner wall of the cavity A202. The piezoelectric ceramic piece 3 itself is not in direct contact with the outer tube and is not affected by external resonance or aftershocks.

[0023] In the preferred technical solution, the outer wall of the bottom end of the covering tube 1 is integrally formed with an external thread 102, and the top of the inner wall of the cavity A202 is integrally formed with an internal thread 203 that engages with the external thread 102. The covering tube 1 is threadedly connected to the top of the outer tube 2, which not only provides better sealing, but also better installation stability, and is convenient for disassembly and assembly.

[0024] In the preferred technical solution, a number of silicone balls 301 are arranged around the circumferential surface of the piezoelectric ceramic piece 3. When the piezoelectric ceramic piece 3 is embedded in the cavity A202, the silicone balls 301 are in close contact with the inner wall of the cavity A202. The silicone balls 301 make the piezoelectric ceramic piece 3 in soft contact with the inner wall of the cavity A202. The piezoelectric ceramic piece 3 itself is not in direct contact with the outer cylinder and is not affected by external resonance or aftershocks.

[0025] In the preferred technical solution, a sealing cover 101 is provided at the top of the capping cylinder 1 , and the sealing cover 101 seals and protects the piezoelectric ceramic piece 3 , thereby extending the service life of the piezoelectric ceramic piece 3 .

[0026] In the preferred technical solution, the inner diameter of the cavity B201 is consistent with the inner diameter of the magnetic ring B4, so that the magnetic ring B4 is fully in contact with the bottom of the cavity A202.

[0027] To summarize, this embodiment provides a method for generating high-intensity ultrasonic pulses on a piezoelectric ceramic piece by introducing a high-voltage, high-frequency electrical signal. In order to reduce the aftershocks after the piezoelectric ceramic piece 3 generates ultrasonic waves, the silicone ball 301 makes soft contact between the piezoelectric ceramic piece 3 and the inner wall of the cavity A202. The piezoelectric ceramic piece 3 and the outer cylinder adopt a magnetic levitation limiting method and are not in direct contact, which greatly reduces the aftershocks after the piezoelectric ceramic piece 3 generates ultrasonic waves and improves the resolution and accuracy of ultrasonic detection.

Claims

1. A transmitting transducer for detecting internal defects in non-metallic media, characterized by: The invention comprises an outer cylinder (2) and a sealing cylinder (1) spirally arranged on the top of the outer cylinder (2); the outer cylinder (2) is provided with a cavity A (202) and a cavity B (201) in sequence from top to bottom; a magnetic ring A (103) is fixedly arranged at the bottom of the sealing cylinder (1); a magnetic ring B (4) is fixedly arranged at the bottom end of the cavity A (202); a piezoelectric ceramic piece (3) is suspended above the magnetic ring B (4); a magnetic ring C (302) having the same magnetic properties as the magnetic ring A (103) is fixedly arranged on the top surface of the piezoelectric ceramic piece (3); a magnetic ring D having the same magnetic properties as the magnetic ring B (4) is fixedly arranged on the bottom surface of the piezoelectric ceramic piece (3); an electrode A (5) is connected to the bottom surface of the piezoelectric ceramic piece (3); and an electrode B (6) is connected to the inner wall of the outer cylinder (2).

2. The transmitting transducer for detecting internal defects in non-metallic media according to claim 1, characterized in that: The outer wall of the bottom end of the capping cylinder (1) is integrally formed with an external thread (102), and the top end of the inner wall of the cavity A (202) is integrally formed with an internal thread (203) that meshes with the external thread (102).

3. The transmitting transducer for detecting internal defects in non-metallic media according to claim 1, characterized in that: A plurality of silica gel balls (301) are arranged around the circumferential surface of the piezoelectric ceramic piece (3); when the piezoelectric ceramic piece (3) is embedded in the cavity A (202), the silica gel balls (301) are in close contact with the inner wall of the cavity A (202).

4. The transmitting transducer for detecting internal defects in non-metallic media according to claim 1, characterized in that: A sealing cover (101) is provided at the top end of the sealing cylinder (1).

5. The transmitting transducer for detecting internal defects of non-metallic media according to claim 1, characterized in that: The inner diameter of the cavity B (201) is consistent with the inner diameter of the magnetic ring B (4).

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