CN212723350U

CN212723350U - Ultrasonic small-angle distance measuring sensor

Info

Publication number: CN212723350U
Application number: CN202021414793.9U
Authority: CN
Inventors: 林聪�; 蒋治宏; 陈才顺
Original assignee: Shenzhen Dianyingpu Technology Co ltd
Current assignee: Shenzhen Dianyingpu Technology Co ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2021-03-16
Anticipated expiration: 2030-07-17

Abstract

An ultrasonic small-angle ranging sensor comprises a main body structure, a mesh enclosure, an ultrasonic probe, a circuit board and a rear cover; the main structure is cylindrical, and a mesh enclosure is arranged on the end face of the opening of the cylinder; the front section of the cylinder is provided with a reflecting wall which is in a shape of a conical table with more than eight sides or a parabolic umbrella surface; a through hole is arranged in the bottom area of the reflecting wall, a reflecting surface is arranged above the through hole, the reflecting surface is a cone with more than eight sides, and the number of the sides of the reflecting surface is equal to that of the reflecting wall; the inner cavity of the cylinder body below the reflecting wall is an accommodating cavity, and an ultrasonic probe accommodating cavity is arranged in the accommodating cavity; the circuit board is fixedly sleeved on the ultrasonic probe accommodating cavity cylinder; the rear cover is arranged at the rear end of the cylinder body and covers the accommodating cavity. The utility model provides an among the prior art ultrasonic ranging angle big, problem that barrier propterty is poor.

Description

Ultrasonic small-angle distance measuring sensor

Technical Field

The utility model relates to an ultrasonic ranging field, in particular to ultrasonic wave small-angle distance measuring sensor.

Background

Ultrasonic ranging is a non-contact detection technology, and ultrasonic waves are often used for distance measurement because of strong ultrasonic directivity and no influence of light, color of an object to be measured and the like. Ultrasonic waves are emitted from the source and are reflected back to the source when the object is detected. The speed at which an acoustic wave propagates in a medium is relatively constant, and thus the distance can be determined based on the length of time the acoustic wave is transmitted to the source of returning acoustic waves.

The existing product is used in severe environments such as humid, high-temperature and corrosive gas, and has low reliability and short service life. When in use, spiders are easy to be netted and small insects are easy to nest. The ultrasonic probe of the existing product is in direct contact with the cavity wall, and the surface of the ultrasonic probe is easily abraded. When the obstacles are more at the passing part of the sound wave, the reflected sound wave is more, the interference is more, and the error is easy to report.

Disclosure of Invention

An object of the utility model is to provide an ultrasonic wave low-angle distance measuring sensor has solved the problem that the ultrasonic wave range finding angle is big, barrier propterty is poor.

The purpose of the utility model can be realized by designing an ultrasonic small-angle distance measuring sensor, which comprises a main body structure, a mesh enclosure, an ultrasonic probe, a circuit board and a rear cover;

the main structure is cylindrical, and a mesh enclosure for covering the front opening end face of the barrel is arranged on the front opening end face of the barrel; the front section in the cylinder body is provided with a reflecting wall which is in a shape of a conical table with more than eight sides or a parabolic umbrella surface; a through hole is formed in the bottom area of the reflecting wall, a reflecting surface is arranged above the through hole, the reflecting surface is a cone with more than eight sides, the cone tip is opposite to the through hole, the central axis of the reflecting surface is overlapped with the central axis of the reflecting wall, and the number of sides of the reflecting surface is equal to that of the reflecting wall; the inner cavity of the barrel body below the reflecting wall is an accommodating chamber, an ultrasonic probe accommodating cavity is arranged in the accommodating chamber below the through hole, the ultrasonic probe accommodating cavity is a through barrel body, and the front end of the ultrasonic probe accommodating cavity is connected with the through hole of the reflecting wall;

the middle part of the circuit board is provided with a clamping hole which can pass through the ultrasonic probe accommodating cavity cylinder body, and the circuit board is fixedly sleeved on the ultrasonic probe accommodating cavity cylinder body through the clamping hole; the circuit board is provided with an anti-static circuit, a temperature detection circuit, a boosting excitation pulse circuit, an amplification quantity control circuit, a signal amplification circuit, a shaping circuit and a processor;

the ultrasonic probe is a closed probe and comprises a probe shell, a piezoelectric wafer, a spongy cushion, a PCB and first sealant, wherein the piezoelectric wafer, the spongy cushion and the PCB are arranged in the probe shell; filling the probe shell with first sealant;

the rear cover is arranged at the rear end of the cylinder body and covers the opening at the rear end of the cylinder body.

Furthermore, a silica gel sleeve is arranged between the ultrasonic probe and the ultrasonic probe accommodating cavity.

Furthermore, the distance between the conical point of the reflecting surface and the surface of the emission end of the probe is 5.7 +/-0.5 mm, the distance between the conical point of the reflecting surface and the bottom opening of the reflecting wall is 7.6 +/-0.5 mm, and the angle between the conical edge and the surface of the probe is 34 +/-3 degrees when the center of the reflecting surface is vertical to the probe; the surface edge of the reflecting surface has a diameter of 13 +/-1 mm, and the maximum included angle diameter of the surface edge is 13.5 +/-1 mm; the diameter of the reflecting wall is 50 +/-5 mm, and the diameter of the wall edge is 46 +/-5 mm; the shortest distance between the reflecting surface and the reflecting wall is 5.45 +/-0.3 mm.

Furthermore, a probe lead fixing wire groove is arranged on the cylinder wall at the bottom side of the ultrasonic probe accommodating cavity.

Further, a mesh enclosure fixing groove is formed in the end face of the opening of the cylinder, and the edge of the mesh enclosure is clamped and fixed in the mesh enclosure fixing groove.

Furthermore, the outer edge of the circuit board is provided with a glue leakage hole for the second sealant to flow through.

Furthermore, a wiring clamping groove is formed in the wall of the bottom side of the accommodating chamber.

Furthermore, the rear end face of the cylinder is provided with a clamping groove at the rear end of the cylinder, and the rear cover is arranged at the clamping groove at the rear end of the cylinder.

Furthermore, the inner wall of the accommodating chamber is provided with a clamping point for fixing the circuit board, and the diameter of the circuit board is matched with the clamping point.

Furthermore, the probe shell is a metal shell, the negative electrode of the piezoelectric wafer is connected with the probe shell, the negative electrode of the PCB is connected with the probe shell, and the positive electrode of the PCB is connected with the positive electrode of the piezoelectric wafer

The utility model provides an among the prior art ultrasonic ranging angle big, protective properties is poor, the problem that product reliability is low, the life-span is short under the adverse circumstances.

Drawings

FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 2 is an exploded view of the preferred embodiment of the present invention;

fig. 3 is a block diagram of a preferred embodiment of the present invention;

fig. 4 is a beam pattern of the preferred embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples.

As shown in fig. 1 and 2, an ultrasonic small-angle ranging sensor includes a main body structure 2, a mesh enclosure 1, an ultrasonic probe 5, a circuit board 3, and a rear cover 7.

The main structure 2 is cylindrical, and a mesh enclosure 1 covering the front opening end face of the cylinder is arranged on the front opening end face of the cylinder; the screen panel 1 is installed on the screen panel fixed slot 22 of major structure front end, and screen panel 1 can prevent that the spider from netting or the insect nest at the anterior segment of major structure 2, has protected the anterior segment of major structure. A reflecting wall 21 is arranged at the front section in the cylinder body, and the reflecting wall 21 is in a conical frustum shape or a parabolic umbrella shape with more than eight sides; a through hole is arranged in the bottom area of the reflecting wall 21, a reflecting surface 23 is arranged above the through hole, the reflecting surface 23 is fixed above the through hole through a support leg, the reflecting surface 23 is a cone with more than eight sides, the cone tip is opposite to the through hole, the central axis of the reflecting surface 23 is superposed with the central axis of the reflecting wall 21, the number of sides of the reflecting surface 23 is opposite to the number of sides of the reflecting wall 21, and the like; the inner cavity of the cylinder below the reflecting wall is an accommodating cavity 27, an ultrasonic probe accommodating cavity 24 is arranged in the accommodating cavity below the through hole, the ultrasonic probe accommodating cavity 24 is a through cylinder, and the front end of the ultrasonic probe accommodating cavity 24 is connected with the through hole of the reflecting wall 21. The reflecting wall 21 plays a role of reflecting sound waves, the reflecting surface 23 plays a role of focusing and reflecting sound waves, the ultrasonic probe accommodating cavity 24 plays a role of fixing the ultrasonic probe 5, and the accommodating cavity 27 plays a role of accommodating the circuit board 3.

As shown in fig. 1 and 2, a clamping hole 38 through which the ultrasonic probe accommodating chamber cylinder can pass is formed in the middle of the circuit board 3, and the circuit board 3 is fixedly sleeved on the ultrasonic probe accommodating chamber cylinder through the clamping hole 38. As shown in fig. 3, the circuit board is provided with an antistatic circuit 31, a temperature detection circuit 32, a boosting excitation pulse circuit 33, an amplification amount control circuit 34, a signal amplification circuit 35, a signal shaping circuit 36 and a processor 37; the anti-static circuit 31 protects the processor 37 and prevents static electricity from flowing into the processor 37; the temperature detection circuit 32 detects the external environment temperature and feeds the external environment temperature back to the processor 37; the boosting excitation circuit 33 completes the driving of the ultrasonic probe 5 and emits ultrasonic waves; the amplification control circuit 34 completes the adjustment of the amplification gain; the signal amplification circuit 35 receives the ultrasonic echo to realize a signal amplification function; the signal shaping circuit 36 finishes shaping the echo analog signal into a digital signal, and provides the digital signal to the processor 37; processor 37 performs command issuing, signal acquisition, signal processing, and signal output.

As shown in fig. 1 and 2, the ultrasonic probe 5 is a closed probe, and includes a probe housing, a piezoelectric wafer 51, a sponge pad 52, a PCB 53, and a first sealant 54, wherein the piezoelectric wafer 51, the sponge pad 52, and the PCB 53 are installed in the probe housing, the piezoelectric wafer 51 faces the reflection surface 23, the sponge pad 52 is disposed between the piezoelectric wafer 51 and the PCB 53, and the PCB 53 is connected to the positive and negative electrodes of the piezoelectric wafer 51; the first sealant 54 fills the probe housing; in this embodiment, the ultrasonic probe 5 is a 40KHz closed probe. The piezoelectric wafer 51 completes transmission and reception of ultrasonic waves by a piezoelectric effect; the spongy cushion 52 plays a role of damping the vibration of the piezoelectric wafer 51 and absorbs the ultrasonic wave from the piezoelectric wafer 51 to the back side; the PCB 53 is connected with the positive electrode and the negative electrode of the piezoelectric wafer 51, so that the consistency of lead wires is ensured; the first sealant 54 completes the sealing of the ultrasonic probe 5, enhancing the waterproof performance of the ultrasonic probe 5. In this embodiment, the probe case is a metal case, the negative electrode of the piezoelectric wafer 51 is connected to the probe case, the negative electrode of the PCB 53 is connected to the probe case, and the positive electrode of the PCB 53 is connected to the positive electrode of the piezoelectric wafer 51.

As shown in fig. 1 and 2, the rear cover 7 is attached to the rear end of the cylinder. The rear cover 7 is installed at the clamping groove at the rear end of the barrel body, covers the opening at the rear end of the barrel body, namely covers the accommodating cavity 27, and can effectively protect the circuit board 3 in the accommodating cavity from being influenced by external force. After the ultrasonic probe 5 and the circuit board 3 are installed in the accommodating chamber 27, a second sealant is used for sealing, so that the probability of collision damage of the circuit board 3 and the ultrasonic probe 5 is reduced, and the overall waterproof effect is enhanced.

As shown in fig. 2, a silicone sleeve 6 is disposed between the ultrasonic probe 5 and the ultrasonic probe accommodating cavity 24. The silica gel sleeve 6 wraps the ultrasonic probe 5 and is arranged in the ultrasonic probe accommodating cavity 24, so that the ultrasonic probe 5 is prevented from contacting with the cavity wall of the ultrasonic probe accommodating cavity 24, and the isolation and buffering effects are achieved.

The distance between the conical point of the reflecting surface 23 and the surface of the emission end of the probe is 5.7 +/-0.5 mm, the distance between the conical point of the reflecting surface 23 and the opening at the bottom of the reflecting wall 21 is 7.6 +/-0.5 mm, and the angle between the conical edge and the surface of the probe is 34 +/-3 degrees when the center of the reflecting surface is vertical to the probe; the surface edge of the reflecting surface 23 has a diameter of 13 +/-1 mm, and the maximum included angle diameter of the surface edge is 13.5 +/-1 mm; the diameter of the reflecting wall 21 is 50 +/-5 mm, and the diameter of the wall edge is 46 +/-5 mm; the shortest distance between the reflecting surface 23 and the reflecting wall 21 is 5.45 +/-0.3 mm. The number of the face sides of the reflecting surface 23 is the same as that of the wall sides of the reflecting wall 21, and the face sides and the wall sides correspond to each other when the reflecting surface is mounted. The size data enables the embodiment to have a good ultrasonic effect. As shown in fig. 4, the utility model discloses a sound wave concentration is high, closely is difficult for being disturbed. On the basis of unchanging the long-distance angle, the short-distance angle is effectively reduced, and the phenomenon of short-distance misjudgment is solved.

As shown in fig. 1, a probe lead fixing line slot 25 is arranged on the wall of the bottom side of the ultrasonic probe accommodating cavity 24, and the probe lead fixing line slot 25 plays a role in fixing a probe lead to prevent the influence on the probe lead when the second sealant is poured.

As shown in fig. 1 and 2, a mesh enclosure fixing groove 22 is provided on the opening end surface of the cylinder, and the edge of the mesh enclosure 1 is fixed in the mesh enclosure fixing groove 22. The edge of the net cover 1 is evenly provided with a plurality of fixing clamping pins 11. The mesh enclosure fixing groove 22 is used for fixing the mesh enclosure 1 to prevent the mesh enclosure 1 from falling off. In order to cooperate with the fixing clip 11, a long deep groove for accommodating the fixing clip 11 is correspondingly arranged on the mesh enclosure fixing groove 22. In this embodiment, the long deep groove extends to the rear end of the accommodating chamber 27 and serves as an air vent of the accommodating chamber 27, and when the sealant rapidly penetrates into the accommodating chamber portion between the circuit board 3 and the reflective wall 21 through the sealant leaking hole 39, air in the portion is partially discharged. The second sealant used in the housing chamber 27 may be the same as or different from the first sealant 54 used in the ultrasonic probe.

As shown in fig. 2, the outer edge of the circuit board 3 is provided with a glue leaking hole 39, so that the second sealant can quickly penetrate into each corner of the accommodating chamber 27, thereby achieving a high waterproof effect. The inner wall of the accommodating chamber is provided with a clamping point for fixing the circuit board, and the diameter of the circuit board is in interference fit with the clamping point.

As shown in fig. 1 and 2, a wiring card slot 26 is disposed on the wall of the bottom side of the accommodating chamber. The connecting wire slot 26 is used for fixing the connecting wire 4. The connecting line 4 is connected with the client using end, and the data transmission is completed.

During assembly, the mesh enclosure 1 is firstly installed at the mesh enclosure fixing groove 22 at the front end of the main structure 2, the mesh enclosure 1 covers an opening at the front end of the main structure 2, then the connecting wire 4 and the ultrasonic probe 5 are connected with the circuit board 3, then the ultrasonic probe 5 is placed in the ultrasonic probe accommodating cavity 24 in the main structure 2, then the circuit board 3 is placed in the accommodating cavity 27 of the main structure 2, then the connecting wire 4 is placed in the wiring clamping groove 26, finally, second sealant is injected from the rear end of the main structure 2 to be sealed, the second sealant is installed in the rear cover 7 after being dried, and assembly is completed.

The beneficial effects of the utility model reside in that: the probe is a closed integrated probe, and the circuit board is arranged in the accommodating cavity and sealed by using sealing glue; the device is more resistant to severe environments such as moisture, high temperature, corrosive gas and the like, and has the characteristics of less maintenance, no pollution, high reliability, long service life and the like. The protective cover is arranged, so that the situation that the sensor cannot work normally due to the fact that spiders weave nets and small insects nest is avoided. The ultrasonic probe is sleeved with the silica gel sleeve to prevent the ultrasonic probe from contacting with the cavity wall, so that the isolation and buffering effects are achieved. The sound wave concentration is high and the near distance is not easy to be interfered.

Claims

1. The utility model provides an ultrasonic wave small-angle range sensor which characterized in that: comprises a main body structure, a mesh enclosure, an ultrasonic probe, a circuit board and a rear cover;

the main structure is cylindrical, and a mesh enclosure for covering the front opening end face of the barrel is arranged on the front opening end face of the barrel; the front section in the cylinder body is provided with a reflecting wall which is in a shape of a conical table with more than eight sides or a parabolic umbrella surface; a through hole is formed in the bottom area of the reflecting wall, a reflecting surface is arranged above the through hole, the reflecting surface is a cone with more than eight sides, the cone tip is opposite to the through hole, the central axis of the reflecting surface is overlapped with the central axis of the reflecting wall, and the number of sides of the reflecting surface is equal to that of the reflecting wall; the inner cavity of the barrel body below the reflecting wall is an accommodating cavity, an ultrasonic probe accommodating cavity is arranged in the accommodating cavity below the through hole, the ultrasonic probe accommodating cavity is a through barrel body, and the front end of the ultrasonic probe accommodating cavity is connected with the through hole of the reflecting wall;

2. The ultrasonic small angle ranging sensor of claim 1 wherein: a silica gel sleeve is arranged between the ultrasonic probe and the ultrasonic probe accommodating cavity.

3. The ultrasonic small angle ranging sensor of claim 1 wherein: the distance between the conical point of the reflecting surface and the surface of the transmitting end of the probe is 5.7 +/-0.5 mm, the distance between the conical point of the reflecting surface and the bottom opening of the reflecting wall is 7.6 +/-0.5 mm, and the angle between the conical edge and the surface of the probe is 34 +/-3 degrees when the center of the reflecting surface is vertical to the probe; the surface edge of the reflecting surface has a diameter of 13 +/-1 mm, and the maximum included angle diameter of the surface edge is 13.5 +/-1 mm; the diameter of the reflecting wall is 50 +/-5 mm, and the diameter of the wall edge is 46 +/-5 mm; the shortest distance between the reflecting surface and the reflecting wall is 5.45 +/-0.3 mm.

4. The ultrasonic small angle ranging sensor of claim 1 wherein: the wall of the bottom side of the ultrasonic probe accommodating cavity is provided with a probe lead fixing wire groove.

5. The ultrasonic small angle ranging sensor of claim 1 wherein: a mesh enclosure fixing groove is formed in the end face of the opening of the barrel, and the edge of the mesh enclosure is clamped and fixed in the mesh enclosure fixing groove.

6. The ultrasonic small angle ranging sensor of claim 1 wherein: the outer edge of the circuit board is provided with a glue leakage hole for the second sealant to flow.

7. The ultrasonic small angle ranging sensor of claim 1 wherein: the wall of the bottom side of the containing chamber is provided with a wiring clamping groove.

8. The ultrasonic small angle ranging sensor of claim 1 wherein: the rear end face of the barrel is provided with a barrel rear end clamping groove, and the rear cover is arranged at the barrel rear end clamping groove.

9. The ultrasonic small angle ranging sensor of claim 1 wherein: the inner wall of the accommodating chamber is provided with a clamping point for fixing the circuit board, and the diameter of the circuit board is matched with the clamping point.

10. The ultrasonic small angle ranging sensor of claim 1 wherein: the probe shell is a metal shell, the negative electrode of the piezoelectric wafer is connected with the probe shell, the negative electrode of the PCB is connected with the probe shell, and the positive electrode of the PCB is connected with the positive electrode of the piezoelectric wafer.