A piezoelectric ultrasonic sensor

Abstract

This utility model discloses a piezoelectric ultrasonic sensor, relating to the field of sensors. It includes a mounting plate, a circuit board, and a sensor body. The circuit board is located in front of the mounting plate, and the sensor body is fixedly mounted on the front end of the circuit board. A connecting plate is fixedly mounted on the front end of the mounting plate. This utility model forms an elastic support structure. When the sensor body is subjected to external impact or vibration, the buffer spring can absorb energy through deformation, significantly reducing the mechanical stress transmitted to the circuit board and sensor body, preventing precision components from wearing or breaking due to vibration. The flow guide plate directs ambient sound waves to the sensor body, achieving a sound wave focusing effect and improving signal reception sensitivity. Furthermore, the sound wave reception angle and coverage range can be adjusted by sliding and rotating the flow guide plate to adapt to different detection scenarios. The number of flow guide plates can also be increased or decreased for customized applications.

Description

Technical Field

[0001] This utility model relates to the field of sensors, and in particular to a piezoelectric ultrasonic sensor. Background Technology

[0002] Piezoelectric ultrasonic sensors are a type of sensor that can convert ultrasonic signals into other energy signals and are widely used in industry, defense, biomedicine and other fields.

[0003] However, when using ultrasonic sensors, traditional sensors are typically mounted directly on equipment via a rigid structure. In industrial environments or applications such as mobile robots, the equipment inevitably experiences mechanical stress from external vibrations, impacts, or frequent start-stop cycles. This stress is directly transmitted to the precision piezoelectric wafers and circuit boards inside the sensor through the mounting structure. Long-term exposure can easily lead to wafer fatigue and cracking, loose solder joints, and even damage to circuit components, severely impacting the sensor's lifespan and measurement reliability. Although some designs attempt to incorporate simple rubber pads, their cushioning effect is limited, and the lack of targeted structural design makes it difficult to effectively isolate high-frequency or high-amplitude vibrations. Furthermore, the emission and reception angles of existing sensors are usually fixed, which results in a relatively limited detection range and direction. When faced with complex detection environments, such as when focusing on detecting small targets at a distance or covering a wider fan-shaped area, fixed-angle sensors are inadequate. Users often need to mechanically rotate the entire sensor or use multiple sensor arrays of different specifications to meet different needs. This approach not only increases the complexity and cost of the system structure but also makes the debugging and installation process cumbersome and inflexible. At the same time, interference echoes from the environment are easily received from the side, thereby reducing the signal-to-noise ratio and the detection sensitivity in the direction of the main beam. Utility Model Content

[0004] The main objective of this invention is to provide a piezoelectric ultrasonic sensor that can effectively solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A piezoelectric ultrasonic sensor includes a mounting plate, a circuit board, and a sensor body. The circuit board is located in front of the mounting plate, and the sensor body is fixedly mounted on the front end of the circuit board. A connecting plate is fixedly mounted on the front end of the mounting plate, and buffer springs are fixedly mounted on both ends of the connecting plate. A side mounting plate is fixedly mounted in front of the middle of the two buffer springs, and a protective plate structure is provided on the front end of the mounting plate outside the connecting plate.

[0007] As a further embodiment of this utility model, the circuit board is fixedly installed in the middle of the two side mounting plates, and the circuit board is located in front of the connecting plate.

[0008] As a further embodiment of this utility model, the buffer spring is arranged in a semi-circular shape, and the buffer springs on both sides are symmetrically arranged around the center of the connecting plate.

[0009] As a further embodiment of this utility model, a capacitor is fixedly installed at the front end of the circuit board below the sensor body, and a connecting connector is fixedly installed at the front end of the circuit board above the sensor body.

[0010] As a further embodiment of this utility model, the guard plate structure includes an installation ring, a sliding groove, a sliding snap block, and a flow guide guard plate. The installation ring is fixedly installed at the front end of the installation plate and located on the outside of the connecting plate. The sliding groove is opened on the outside of the installation ring. Multiple sliding snap blocks are inserted into the sliding groove. The flow guide guard plate is movably installed on the outside of the sliding snap block.

[0011] As a further embodiment of this utility model, the sliding snap block slides around the sliding slot, and multiple sliding snap blocks and flow guide plates are arranged in a circle around the center of the mounting ring, with the flow guide plates located on the outside of the sensor body.

[0012] Compared with the prior art, the present invention has the following advantages: the mounting plate and the side mounting plate are connected by semi-circular buffer springs arranged symmetrically on both sides to form an elastic support structure. When the sensor body is subjected to external impact or vibration, the buffer springs can absorb energy through deformation, which greatly reduces the mechanical stress transmitted to the circuit board and the sensor body, and prevents precision components from being worn or broken due to vibration.

[0013] With its designed protective plate structure, the flow guide plate surrounds the sensor body and moves freely within the sliding slot via a sliding latch. The flow guide plate directs and focuses ambient sound waves onto the sensor body, achieving a sound wave focusing effect and improving signal reception sensitivity. Simultaneously, the sound wave reception angle and coverage range can be adjusted by sliding and rotating the flow guide plate to adapt to different detection scenarios. Furthermore, the number of flow guide plates can be increased or decreased for customized applications and to facilitate multi-directional sound wave monitoring. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of a piezoelectric ultrasonic sensor according to the present invention;

[0015] Figure 2 This is an exploded view of the connecting plate in a piezoelectric ultrasonic sensor according to this utility model;

[0016] Figure 3 This is an exploded view of the sliding snap-fit ​​block in a piezoelectric ultrasonic sensor according to this utility model;

[0017] Figure 4 This is an enlarged view of the circuit board in a piezoelectric ultrasonic sensor according to this utility model;

[0018] Figure 5 This is an enlarged view of the protective plate structure in a piezoelectric ultrasonic sensor according to this utility model.

[0019] In the diagram: 1. Mounting plate; 2. Connecting plate; 3. Buffer spring; 4. Side mounting plate; 5. Circuit board; 6. Sensor body; 7. Capacitor; 8. Connecting connector; 9. Protective plate structure; 10. Mounting ring; 11. Sliding slot; 12. Sliding snap block; 13. Flow guide plate. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figures 1-5 As shown, a piezoelectric ultrasonic sensor is described; please refer to it carefully. Figures 1-5 It includes a mounting plate 1, a circuit board 5, and a sensor body 6. The circuit board 5 is located in front of the mounting plate 1. The sensor body 6 is fixedly installed at the front end of the circuit board 5. A connecting plate 2 is fixedly installed at the front end of the mounting plate 1. Buffer springs 3 are fixedly installed at both ends of the connecting plate 2. A side mounting plate 4 is fixedly installed in front of the middle of the two buffer springs 3. A protective plate structure 9 is provided at the front end of the mounting plate 1 outside the connecting plate 2.

[0022] Please refer to this carefully. Figure 1 , Figure 4 and Figure 5 The circuit board 5 is fixedly installed in the middle of the two side mounting plates 4, and the circuit board 5 is located in front of the connecting plate 2.

[0023] Please refer to this carefully. Figure 1 , Figure 2 , Figure 4 and Figure 5 , Figure 4 and Figure 5 The buffer spring 3 is set in a semi-circle, and the buffer springs 3 on both sides are symmetrically arranged around the center of the connecting plate 2.

[0024] Please refer to this carefully. Figure 1 , Figure 4 and Figure 5 A capacitor 7 is fixedly installed at the front end of the circuit board 5 below the sensor body 6, and a connector 8 is fixedly installed at the front end of the circuit board 5 above the sensor body 6.

[0025] Specifically, the connector 8 serves as a circuit connection, the capacitor 7 serves as a charge storage device, and the buffer spring 3 is an elastic structure. The circuit board 5 is elastically mounted through the buffer spring 3. Therefore, when the sensor body 6 receives sound waves and is impacted, the deformation of the buffer spring 3 serves as a buffer to prevent the sensor body 6 from vibrating and wearing out, thus preventing damage.

[0026] Please refer to this carefully. Figure 2 , Figure 3 and Figure 5 The guard plate structure 9 includes a mounting ring 10, a sliding groove 11, a sliding snap block 12, and a flow guide guard plate 13. The mounting ring 10 is fixedly installed at the front end of the mounting plate 1 and located on the outside of the connecting plate 2. The sliding groove 11 is opened on the outside of the mounting ring 10. Multiple sliding snap blocks 12 are inserted into the sliding groove 11. The flow guide guard plate 13 is movably installed on the outside of the sliding snap block 12.

[0027] Please refer to this carefully. Figure 2 , Figure 3 and Figure 5 The sliding snap block 12 slides around the sliding slot 11. Multiple sliding snap blocks 12 and flow guide plates 13 are arranged in a circle around the center of the mounting ring 10. The flow guide plates 13 are located on the outside of the sensor body 6.

[0028] Specifically, the flow guide plate 13 acts as a sound wave guide on the outside of the sensor body 6, concentrating the sound waves onto the sensor body 6 to improve the receiving effect. At the same time, by using the sliding block 12 to slide around the sliding slot 11 and the rotation of the flow guide plate 13 around the sliding block 12, the position of the flow guide plate 13 can be adjusted, changing the position of the sound wave concentration. The sliding block 12 can also be removed from the sliding slot 11 in the mounting ring 10 to increase or decrease the number of flow guide plates 13.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric ultrasonic sensor comprising a mounting fixing plate (1), a circuit board (5) and a sensor main body (6), the circuit board (5) being located in front of the mounting fixing plate (1), the sensor main body (6) being fixedly mounted at the front end of the circuit board (5), characterized in that: A connecting plate (2) is fixedly installed at the front end of the mounting plate (1). Buffer springs (3) are fixedly installed at both ends of the connecting plate (2). A side mounting plate (4) is fixedly installed in front of the middle of the two buffer springs (3). A protective plate structure (9) is provided at the front end of the mounting plate (1) outside the connecting plate (2).

2. A piezoelectric ultrasonic sensor according to claim 1, characterized in that: The circuit board (5) is fixedly installed in the middle of the two side mounting plates (4), and the circuit board (5) is located in front of the connecting plate (2).

3. A piezoelectric ultrasonic sensor according to claim 1, wherein: The buffer spring (3) is semi-circular, and the buffer springs (3) on both sides are symmetrically arranged around the center of the connecting plate (2).

4. A piezoelectric ultrasonic transducer according to claim 1, wherein: A capacitor (7) is fixedly installed at the front end of the circuit board (5) below the sensor body (6), and a connector (8) is fixedly installed at the front end of the circuit board (5) above the sensor body (6).

5. A piezoelectric ultrasonic transducer according to claim 1, wherein: The guard plate structure (9) includes an installation ring (10), a sliding slot (11), a sliding snap block (12), and a flow guide guard plate (13). The installation ring (10) is fixedly installed at the front end of the installation fixing plate (1) and located on the outside of the connecting plate (2). The sliding slot (11) is opened on the outside of the installation ring (10). Multiple sliding snap blocks (12) are inserted into the sliding slot (11). The flow guide guard plate (13) is movably installed on the outside of the sliding snap block (12).

6. A piezoelectric ultrasonic sensor according to claim 5, wherein: The sliding snap block (12) slides around the sliding slot (11), and multiple sliding snap blocks (12) and flow guide plate (13) are arranged in a circle around the center of the mounting ring (10). The flow guide plate (13) is located on the outside of the sensor body (6).

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