Final inspection jig for ultrasonic sensor

Abstract

The utility model discloses a final inspection jig for an ultrasonic sensor. The final inspection jig comprises a base, a sensor positioning assembly, a probe assembly and a test assembly, the sensor positioning assembly comprises a support, a sensor positioning seat and a pressing rod. The support is arranged on the base, the sensor positioning seat is arranged on the support, and a positioning groove is formed in the top of the sensor positioning seat; the pressing rod is movably connected with the support and used for pressing the ultrasonic sensor placed in the positioning groove. The probe assembly comprises a sliding block seat, a sliding block and a probe; the sliding block seat is arranged on the base, the probe is fixed on the sliding block, and the sliding block is arranged on the sliding block seat in a sliding manner; the test assembly comprises a base, a sound source box, a microphone fixing block and a microphone; the base is arranged on the base, the sound source box is arranged on the base, a microphone supporting seat is arranged at the top of the sound source box, the microphone fixing block is pressed on the microphone supporting seat and detachably connected with the microphone supporting seat, and a positioning cavity is formed by the microphone fixing block and the microphone supporting seat; the microphone passes through and is positioned in the positioning cavity. According to the utility model, the final inspection speed and efficiency of the ultrasonic sensor are improved.

Description

Technical Field

[0001] The utility model relates to testing equipment for an ultrasonic sensor. Background Art

[0002] The ultrasonic sensor includes a shell made of metal material and a piezoelectric component. The ultrasonic sensor shell has a cavity with an opening at one end, and the piezoelectric component is arranged in the cavity, wherein the piezoelectric element (such as a piezoelectric ceramic sheet) in the piezoelectric component is fixed to the bottom wall of the cavity (i.e., the bottom plate of the ultrasonic sensor shell). When current flows through the piezoelectric component, the piezoelectric component converts electrical energy into mechanical energy, driving the bottom plate of the ultrasonic sensor shell (the bottom plate is also called a diaphragm) to vibrate and emit ultrasonic waves. When the ultrasonic wave encounters an obstacle, it is reflected back to the ultrasonic sensor. The physical information such as the distance and size of the obstacle can be judged by the time difference between ultrasonic reception and transmission.

[0003] EOL (End-of-Line) testing, or final inspection, is the performance test of ultrasonic sensors before they are offline. Ultrasonic sensors must ultimately meet the designed characteristics and performance consistency. The frequency, sensitivity, sound pressure value, residual vibration, and directivity of the sample must be within the designed tolerance range so that they can be used with other sensors and computer calculations after subsequent installation. At present, there is a lack of special test fixtures for the final inspection of ultrasonic sensors, and there are shortcomings such as slow inspection speed and low inspection efficiency. The accuracy and reliability of the inspection results also need to be improved. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an ultrasonic sensor final inspection jig, which can improve the speed and efficiency of the ultrasonic sensor final inspection, has low implementation cost, and improves the accuracy and reliability of the inspection result.

[0005] The utility model provides a final inspection jig for an ultrasonic sensor, comprising a base, a sensor positioning assembly, a probe assembly and a test assembly; the sensor positioning assembly comprises a bracket, a sensor positioning seat and a pressure rod; the bracket is arranged on the base, the sensor positioning seat is arranged on the bracket, and a positioning groove matched with the ultrasonic sensor to be inspected is opened on the top of the sensor positioning seat; the pressure rod is movably connected with the bracket and is used to press the ultrasonic sensor placed in the positioning groove; the probe assembly comprises a slider seat, a slider and a probe; the slider seat is arranged on the base, the probe is fixed on the slider, and the slider is slidably arranged on the slider seat to approach or move away from the sensor positioning seat so that the probe is electrically connected or separated from the ultrasonic sensor to be inspected; the test assembly comprises a base, a sound source box, a microphone fixing block and a microphone; the base is arranged on the base, the sound source box is arranged on the base, a microphone supporting seat is arranged on the top of the sound source box, the microphone fixing block is pressed on the microphone supporting seat and is detachably connected to the microphone supporting seat, a positioning cavity for the microphone to pass through and be positioned is formed between the microphone fixing block and the microphone supporting seat; the microphone passes through and is positioned in the positioning cavity.

[0006] The utility model has at least the following advantages:

[0007] 1. The embodiment of the utility model can quickly replace the ultrasonic sensor to be tested, and the sound source box for emitting ultrasonic waves and the microphone for receiving ultrasonic waves do not need to be adjusted during the test process, thereby improving the speed and efficiency of the final test of the ultrasonic sensor;

[0008] 2. The embodiment of the utility model can stably locate the ultrasonic sensor being tested, thereby improving the accuracy and reliability of the test results;

[0009] 3. The embodiment of the utility model has the advantages of simple structure, low measurement energy consumption and low fixture cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The overall structural schematic diagram of the ultrasonic sensor final inspection jig according to the embodiment of the utility model is shown.

[0011] Figure 2 An exploded schematic diagram of an ultrasonic sensor final inspection jig according to an embodiment of the utility model is shown.

[0012] Figure 3 A schematic diagram of an ultrasonic sensor and a sensor positioning seat according to an embodiment of the utility model is shown.

[0013] Figure 4 A schematic diagram of a sensor positioning assembly according to an embodiment of the utility model is shown.

[0014] Figure 5A schematic diagram of a probe assembly according to an embodiment of the utility model is shown, wherein the probe is in a state of being electrically connected to an ultrasonic sensor to be inspected.

[0015] Figure 6 A schematic diagram of a test assembly according to an embodiment of the utility model is shown.

[0016] Figure 7 The figure schematically shows the positional relationship between the core probe, ultrasonic sensor and microphone during the final inspection. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] See also Figures 1 to 6 The ultrasonic sensor final inspection jig according to an embodiment of the utility model includes a base 1 , a sensor positioning component 2 , a probe component 3 and a test component 4 .

[0019] The sensor positioning assembly 2 includes a bracket 21, a sensor positioning seat 22 and a pressure rod 23. The bracket 21 is arranged on the base 1, the sensor positioning seat 22 is arranged on the bracket 21, and a positioning groove 220 adapted to the ultrasonic sensor 9 to be tested is provided on the top of the sensor positioning seat 22. The pressure rod 23 is movably connected with the bracket 21, and is used to press the ultrasonic sensor 9 placed in the positioning groove 220, wherein a pressure head 231 is provided at the front of the pressure rod 23 for pressing the ultrasonic sensor 9 placed in the positioning groove 220, and the middle part of the pressure rod 23 is pivotally connected with the bracket 21.

[0020] In this embodiment, the bracket 21 includes a base plate 211, a support leg 212 and a pivot frame 213. The pivot frame 213 and the sensor positioning seat 22 are respectively arranged on the base plate 211, and the top and bottom ends of the support leg 212 are respectively connected to the base plate 211 and the base 1. Among them, the sensor positioning seat 22 is detachably connected to the base plate 211 by screws. The sensor positioning assembly 2 also includes a self-locking telescopic rod 24 and a pair of connecting arms 25. The self-locking telescopic rod 24 includes a movable rod 241 and a fixed cylinder 242, the top end of the fixed cylinder 242 is connected to the base plate 211 and is open upward, the upper end of the movable rod 241 is pivoted to the rear end of the pressure rod 23, and the lower end of the movable rod 241 is slidably arranged in the fixed cylinder 242. The upper ends of the pair of connecting arms 25 are respectively connected to the two side surfaces of the pressure rod 23, and the lower ends of the pair of connecting arms 25 are pivoted to the pivot frame 213 through the pivot 26. The length of the self-locking telescopic rod 24 can be extended or shortened as the pressure rod 23 swings, and the self-locking telescopic rod 24 can be locked at any length to keep the length fixed. The self-locking principle of the self-locking telescopic rod 24 belongs to the prior art and will not be repeated here.

[0021] The probe assembly 3 includes a slider seat 31, a slider 32 and a probe 33. The slider seat 31 is arranged on the base 1, and the probe 33 is arranged on the slider 32. The slider 32 is slidably arranged on the slider seat 31 to approach or move away from the sensor positioning seat 22, so that the probe 33 is electrically connected to or separated from the ultrasonic sensor 9 to be tested. When the probe 33 is electrically connected to the ultrasonic sensor 9 to be tested, as shown in FIG. Figure 5 As shown, the probe 33 extends into the electrical interface 93 of the ultrasonic sensor 9 and contacts the PIN needle in the electrical interface 93 to achieve electrical connection.

[0022] In this embodiment, a guide rail 34 is provided on the top of the slider seat 31, and a slide groove 324 is provided on the bottom surface of the slider 32 to slide with the guide rail 34. Specifically, the slider seat 31 includes a base frame 311 and a guide block 312, the base frame 311 is provided on the base 1, the guide block 312 is provided on the base frame 311, and the guide rail 34 is provided on the guide block 312. The guide block 312 is provided with a pair of guide through holes 313, and the extension direction of the pair of guide through holes 313 is consistent with the extension direction of the guide rail 34. The slider 32 is in an inverted L-shape, including a horizontal side portion 321 and a vertical side portion 322 extending downward from one end of the horizontal side portion 321, and a slide groove 324 is provided on the bottom surface of the horizontal side portion 321; a pair of guide posts 35 are provided below the horizontal side portion 321, and the pair of guide posts 35 can movably pass through a pair of guide through holes 313, one end of each guide post 35 is connected to the vertical side portion 322, and the other end of each guide post 35 is provided with a stopper 351 to prevent the guide post 35 from sliding out of the guide through hole 313. Optionally, the stopper 351 is a disc, and the diameter of the disc is larger than the diameter of the guide through hole 313.

[0023] The test assembly 4 includes a base 41, a sound source box 42, a microphone fixing block 43 and a microphone 44. The base 41 is arranged on the base 1, the sound source box 42 is arranged on the base 41, a microphone support seat 45 is arranged on the top of the sound source box 42, the microphone fixing block 43 is pressed on the microphone support seat 45 and is detachably connected to the microphone support seat 45, and a positioning cavity 46 is formed between the microphone fixing block 43 and the microphone support seat 45 for the microphone 44 to pass through and position.

[0024] In this embodiment, a slot 411 is provided on the top of the base 41, the lower part of the sound source box 42 is arranged in the slot 411, and the sound source box 42 is detachably connected to the base 41 by fasteners (such as screws). The materials of the microphone support seat 45, the shell 422 of the sound source box 42 and the microphone fixing block 43 are all plastic. The microphone support seat 45 and the shell 422 of the sound source box 42 are integrally formed, and the microphone fixing block 43 is detachably connected to the microphone support seat 45 by a plurality of fasteners, which include but are not limited to screws. The bottom surface of the microphone fixing block 43 is provided with a first semicircular groove 431 that penetrates along the axial direction, and the top surface of the microphone support seat 45 is provided with a second semicircular groove 451 that penetrates along the axial direction. When the microphone fixing block 43 is connected to the microphone support seat 45, the first semicircular groove 431 and the second semicircular groove 451 are matched to form a cylindrical positioning cavity 46. The microphone 44 passes through and is positioned in the positioning cavity 46 (resisted by the inner wall of the positioning cavity 46).

[0025] Before connecting the microphone fixing block 43 to the microphone supporting seat 45, manually adjust the distance between the microphone 44 and the ultrasonic sensor 9 to be tested, and then connect the microphone fixing block 43 to the microphone supporting seat 45 with screws.

[0026] The front of the sound source box 42 is provided with a probe core 421; during the final inspection, the circuit board inside the sound source box 4 is connected to the industrial computer, and the signal of the industrial computer is transmitted to the circuit board, driving the probe core 421 to emit ultrasonic waves of a fixed frequency band. The specific circuit structure and working principle of the sound source box 4 belong to the prior art and will not be repeated here.

[0027] Preferably, the probe core 421 and the central axis of the ultrasonic sensor 9 to be tested are located on the same straight line, and the central axis of the probe core 421, the central axis of the microphone 44 and the central axis of the ultrasonic sensor 9 to be tested are located on the same plane P (plane P is a plane perpendicular to the plane 11 on the base 1), please refer to Figure 7 , Figure 7 Also schematically shown are the center O1 of the probe core 421 , the center O2 of the microphone 44 , and the center O3 of the ultrasonic sensor 9 to be tested.

[0028] During the inspection, the ultrasonic sensor 9 to be inspected is placed in the positioning groove 220 of the sensor positioning seat 22 (such as Figure 3 Then, the pressure rod 23 is rotated to make it move from Figure 4The first position shown by the dotted line is rotated to the second position shown by the solid line, pressing the ultrasonic sensor 9. The sensor positioning seat 22 and the pressure rod 23 jointly fix the ultrasonic sensor 9 to be inspected, which can ensure the position stability during the inspection of the finished sensor, not only improve the accuracy and reliability of the inspection results, but also increase the replacement speed of the ultrasonic sensor 9 to be inspected. Then, the slider 32 is moved to electrically connect the probe 33 to the PIN pin of the ultrasonic sensor 9 to be inspected, as shown in FIG. Figure 5 As shown. During the movement, the cooperation between the guide column 35 and the guide through hole 313, and the limiting cooperation between the slide groove 324 and the guide rail 34 can ensure the position accuracy of the probe 33 during the lateral movement, and improve the speed of the electrical connection between the PIN needle of the ultrasonic sensor 9 and the probe 33. The sound source box 42 and the microphone 44 respectively transmit and receive ultrasonic signals. At the same time, the sound source box 42 and the microphone 44 are respectively connected to the industrial computer for signal transmission, and the industrial computer analyzes the signal. When the sound source box 42 is working, the ultrasonic sensor 9 receives the ultrasonic wave emitted by the probe core 421 of the sound source box 42. When the ultrasonic sensor 9 transmits an ultrasonic signal, it is received by the microphone 44.

[0029] The embodiment of the utility model can quickly replace the ultrasonic sensor to be tested, and the sound source box for emitting ultrasonic waves and the microphone for receiving ultrasonic waves do not need to be adjusted during the test process, thereby improving the speed and efficiency of the final test of the ultrasonic sensor.

[0030] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An ultrasonic sensor final inspection jig, characterized in that: Includes a base, a sensor positioning assembly, a probe assembly and a test assembly; The sensor positioning assembly comprises a bracket, a sensor positioning seat and a pressure rod; the bracket is arranged on the base, the sensor positioning seat is arranged on the bracket, and a positioning groove adapted to the ultrasonic sensor to be inspected is provided on the top of the sensor positioning seat; the pressure rod is movably connected to the bracket and is used to press the ultrasonic sensor placed in the positioning groove; The probe assembly includes a slider seat, a slider and a probe; The slider seat is arranged on the base, the probe is fixed to the slider, and the slider is slidably arranged on the slider seat to approach or move away from the sensor positioning seat so that the probe is electrically connected to or separated from the ultrasonic sensor being tested; The test assembly includes a base, a sound source box, a microphone fixing block and a microphone; the base is arranged on the base, the sound source box is arranged on the base, a microphone support seat is provided on the top of the sound source box, the microphone fixing block is pressed on the microphone support seat and is detachably connected to the microphone support seat, and a positioning cavity for the microphone to pass through and be positioned is formed between the microphone fixing block and the microphone support seat; the microphone passes through and is positioned in the positioning cavity.

2. The ultrasonic sensor final inspection jig according to claim 1, characterized in that: The front part of the pressure rod is provided with a pressure head for pressing the ultrasonic sensor placed in the positioning groove, and the middle part of the pressure rod is pivotally connected with the bracket.

3. The ultrasonic sensor final inspection jig according to claim 2, characterized in that: The bracket includes a base plate, a supporting foot and a pivot frame; the pivot frame and the sensor positioning seat are respectively arranged on the base plate, and the top and bottom ends of the supporting foot are respectively connected to the base plate and the base; The sensor positioning assembly includes a self-locking telescopic rod and a pair of connecting arms; the self-locking telescopic rod includes a movable rod and a fixed tube, the top end of the fixed tube is connected to the base plate and is open upward, the upper end of the movable rod is pivotally connected to the rear end of the pressure rod, and the lower end of the movable rod is slidably disposed in the fixed tube; the upper ends of the pair of connecting arms are respectively connected to the two side surfaces of the pressure rod, and the lower ends of the pair of connecting arms are pivotally connected to the pivot frame through a pivot.

4. The ultrasonic sensor final inspection jig according to claim 1, characterized in that: A guide rail is arranged on the top of the slider seat, and a slide groove which is slidably matched with the guide rail is arranged on the bottom surface of the slider.

5. The ultrasonic sensor final inspection jig according to claim 4, characterized in that: The slider seat comprises a base frame and a guide block, wherein the base frame is arranged on the base, the guide block is arranged on the base frame, and the guide rail is arranged on the guide block; the guide block is provided with a pair of guide through holes, and the extension direction of the pair of guide through holes is consistent with the extension direction of the guide rail; The sliding block is in an inverted L-shape, including a horizontal side portion and a vertical side portion extending downward from one end of the horizontal side portion, and the sliding groove is opened on the bottom surface of the horizontal side portion; a pair of guide columns are provided below the horizontal side portion, and the pair of guide columns can respectively pass through the pair of guide through holes movably, one end of each guide column is connected to the vertical side portion, and the other end of each guide column is provided with a limiting portion to prevent the guide column from sliding out of the guide through hole.

6. The ultrasonic sensor final inspection jig according to claim 1, characterized in that: The bottom surface of the microphone fixing block is provided with a first semicircular groove extending axially therethrough, and the top surface of the microphone supporting seat is provided with a second semicircular groove extending axially therethrough. When the microphone fixing block is connected to the microphone supporting seat, the first semicircular groove and the second semicircular groove are matched to form the cylindrical positioning cavity.

7. The ultrasonic sensor final inspection jig according to claim 1, characterized in that: The microphone fixing block is detachably connected to the microphone supporting seat via a plurality of fasteners.

8. The ultrasonic sensor final inspection jig according to claim 1, characterized in that: A probe core is provided on the front of the sound source box; the probe core and the central axis of the ultrasonic sensor being tested are located on the same straight line, and the central axis of the probe core, the central axis of the microphone and the central axis of the ultrasonic sensor being tested are located on the same plane.

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