Ultrasonic sensor shell frequency test fixture

Abstract

The utility model discloses a frequency test fixture for an ultrasonic sensor shell. The frequency test fixture comprises a sliding block seat, a microphone fixing block, a microphone, a sound source box and a sliding block, the sliding block seat comprises a base part, a microphone supporting seat and a pair of vertical rails; the microphone supporting seat is arranged on the base part, the microphone fixing block is pressed on the microphone supporting seat, and the microphone fixing block and the microphone supporting seat are detachably connected and form a positioning cavity for a microphone to pass through and be positioned. The pair of vertical rails is located behind the microphone supporting seat and connected with the base part, and the pair of vertical rails are opposite to each other in a spaced mode; the microphone passes through and is positioned in the positioning cavity; the sound source box is located behind the pair of vertical rails and detachably connected with the pair of vertical rails, and a probe core is arranged on the front face of the sound source box; the sliding block is provided with a positioning hole used for positioning a tested ultrasonic sensor shell, the sliding block can automatically slide to a preset testing position along the pair of vertical rails, and at the testing position, the tested ultrasonic sensor shell directly faces the probe core and the microphone. According to the utility model, the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a test device for an ultrasonic sensor. Background Art

[0002] An ultrasonic sensor includes a housing made of a metal material and a piezoelectric component. The housing of the ultrasonic sensor has a cavity with one end open, and the piezoelectric component is arranged in the cavity. Among them, a piezoelectric element (such as a piezoelectric ceramic sheet) in the piezoelectric component is fixed on the bottom wall of the cavity (i.e., the bottom plate of the housing of the ultrasonic sensor). When an electric current flows through the piezoelectric component, the piezoelectric component will convert electrical energy into mechanical energy, driving the bottom plate of the housing of the ultrasonic sensor (the bottom plate is also called a diaphragm) to vibrate and emit ultrasonic waves. When the ultrasonic waves encounter an obstacle, they are reflected back to the ultrasonic sensor, and physical information such as the distance and size of the obstacle can be judged through the time difference relationship between ultrasonic wave reception and emission.

[0003] At present, there is a lack of a special test fixture for the frequency test of the housing of an ultrasonic sensor, and there are disadvantages such as slow test speed and low test efficiency. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a frequency test fixture for the housing of an ultrasonic sensor, which can improve the frequency test efficiency of the housing of the ultrasonic sensor and has a low implementation cost.

[0005] The utility model provides a frequency test fixture for the housing of an ultrasonic sensor, which includes a slider base, a microphone fixing block, a microphone, a sound source box and a slider; the slider base includes a base part, a microphone support seat and a pair of vertical rails; the microphone support seat is arranged on the base part, the microphone fixing block is pressed on the microphone support seat and is detachably connected with 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 pair of vertical rails are located behind the microphone support seat and are connected with the base part, and the pair of vertical rails are spaced relatively; the microphone passes through and is positioned in the positioning cavity; the sound source box is located behind the pair of vertical rails and is detachably connected with the pair of vertical rails, and a probe core is arranged on the front surface of the sound source box; the slider is provided with a positioning hole for positioning the housing of the ultrasonic sensor to be tested, and the slider can automatically slide down along the pair of vertical rails to a predetermined test position. At the test position, the housing of the ultrasonic sensor to be tested faces the probe core and the microphone respectively.

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

[0007] 1. In the embodiment of the utility model, the housing of the ultrasonic sensor to be tested can be replaced very quickly by means of the slider, 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, which improves the frequency test efficiency of the housing of the ultrasonic sensor;

[0008] 2. The embodiment of the present utility model has the advantages of simple structure, low measurement energy consumption and low fixture cost. Description of the Drawings

[0009] Figure 1 Fig. shows a schematic diagram of the overall structure of an ultrasonic sensor housing frequency test fixture according to an embodiment of the present utility model.

[0010] Figure 2 Fig. shows an exploded view of an ultrasonic sensor housing frequency test fixture according to an embodiment of the present utility model.

[0011] Figure 3 Fig. shows a schematic diagram before connection between a microphone fixing block and a microphone support base according to an embodiment of the present utility model.

[0012] Figure 4 Fig. shows a schematic diagram of a slider according to an embodiment of the present utility model.

[0013] Figure 5 Fig. partially shows an assembly structure of an elastic damping sleeve and a positioning hole of a slider according to an embodiment of the present utility model.

[0014] Figure 6 Fig. partially shows an assembly structure of an elastic damping sleeve and an ultrasonic sensor housing to be tested according to an embodiment of the present utility model.

[0015] Figure 7 Fig. shows a schematic diagram when the slider according to an embodiment of the present utility model is placed in a chute of a pair of vertical rails.

[0016] Figure 8 Fig. shows the positional relationship among a probe core, an ultrasonic sensor housing and a microphone when the slider slides to a predetermined test position. Detailed Description of the Embodiment

[0017] The present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0018] Please refer to Figures 1 to 7 . An ultrasonic sensor housing frequency test fixture according to an embodiment of the present utility model includes a slider base 1, a microphone fixing block 2, a microphone 3, a sound source box 4 and a slider 5.

[0019] The slider base 1 includes a base portion 11, a microphone support base 12 and a pair of vertical rails 13. The microphone support base 12 is fixedly arranged on the base portion 11, and the pair of vertical rails 13 are located behind the microphone support base 12. In this embodiment, the base portion 11, the microphone support base 12 and the pair of vertical rails 13 are integrally formed. Optionally, a pair of columns 14 are further provided on the base portion 11, and the pair of columns 14 are integrally formed with the base portion 11, which can prevent the microphone 3 placed on the microphone support base 12 from moving laterally to both sides.

[0020] The microphone fixing block 2 is pressed on the microphone support seat 12 and is detachably connected to the microphone support seat 12. A positioning cavity 6 for the microphone 3 to pass through and be positioned is formed between the microphone fixing block 2 and the microphone support seat 12. In the present embodiment, the bottom surface of the microphone fixing block 2 is provided with a first semicircular groove 21 that penetrates along the axial direction, and the top surface of the microphone support seat 12 is provided with a second semicircular groove 121 that penetrates along the axial direction. When the microphone fixing block 2 is connected to the microphone support seat 12, the first semicircular groove 12 and the second semicircular groove 121 are matched to form a cylindrical positioning cavity 6. The microphone 3 passes through and is positioned in the positioning cavity 6 (resisted by the inner wall of the positioning cavity 6). Optionally, the microphone fixing block 2 is detachably connected to the microphone support seat 12 by a plurality of fasteners, and the aforementioned fasteners include but are not limited to screws and the like.

[0021] The distance between the microphone 3 and the ultrasonic sensor housing 9 to be tested is preferably 7 mm to 9 mm. If the distance is too close, there will be noise interference, and if the distance is too far, there will be a problem of weakening the sound wave signal. Therefore, before connecting the microphone fixing block 2 to the microphone support base 12, manually adjust the distance between the microphone 3 and the ultrasonic sensor housing 9 to be tested, and then connect the microphone fixing block 2 to the microphone support base 12 with screws.

[0022] A pair of vertical rails 13 are spaced apart from each other. The sound source box 4 is located behind the pair of vertical rails 13 and is detachably connected to the pair of vertical rails 13. Optionally, the housing 40 of the sound source box is detachably connected to the pair of vertical rails 13 by a plurality of fasteners, including but not limited to screws. A probe core 41 is provided on the front of the sound source box 4. During testing, 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 41 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.

[0023] The slider 5 is provided with a positioning hole 50 for positioning the ultrasonic sensor housing 9 to be tested, and the slider 5 can automatically slide along a pair of vertical rails 13 to a predetermined test position, where the ultrasonic sensor housing 9 to be tested faces the probe core 41 and the microphone 3 respectively. Figure 8 As shown, when the slider 5 is in the testing position, the probe core 41 , the ultrasonic sensor housing 9 to be tested and the axis of the microphone 3 are located on the same straight line.

[0024] In this embodiment, vertical sliding grooves 131 extending vertically are respectively formed on the opposite surfaces of a pair of vertical rails 13, and a stop portion (not shown in the figure) is provided in the sliding grooves 131. In some specific embodiments, the stop portion is a rib provided in the sliding grooves 131. When the slider 5 slides along the pair of vertical rails 13 until it is stopped by the above-mentioned stop portion, it reaches the aforementioned predetermined test position.

[0025] Further, an elastic damping sleeve 7 is embedded in the positioning hole 50 of the slider 5. The elastic damping sleeve 7 is made of an elastic non-metallic material, which includes but is not limited to rubber and the like. The elastic damping sleeve 7 is annular and is used to sleeve outside the upper part of the ultrasonic sensor housing 9 to position the ultrasonic sensor housing 9. Specifically, an annular clamping groove 503 extending in the circumferential direction is provided on the hole wall of the positioning hole 50; an annular protrusion 73 extending in the circumferential direction is provided on the outer peripheral surface of the elastic damping sleeve 7, and the annular protrusion 73 is embedded in the annular clamping groove 503. The elastic damping sleeve 7 can play a role in buffering and damping to avoid resonance between the slider 5 and the ultrasonic sensor housing 9.

[0026] In this embodiment, the ultrasonic sensor housing 9 is made of metal, and the slider 5 is made of plastic. Optionally, the ultrasonic sensor housing 9 is made of aluminum. The ultrasonic sensor housing 9 is in a cylindrical shape and includes a bottom plate 9a and an annular side wall 9b connected to the bottom plate 9a.

[0027] The top end of the ultrasonic sensor housing 9 has an annular flange 91 protruding radially outward; the top end orifice of the central through hole 70 of the elastic damping sleeve has an annular lip 72 protruding inward, and an annular groove 71 matching the annular flange 91 of the ultrasonic sensor housing is provided on the hole wall of the central through hole 70 of the elastic damping sleeve 7 adjacent to the annular lip 72. The annular flange 91 of the ultrasonic sensor housing 9 is embedded in the annular groove 71, and the bottom surface of the annular lip 72 of the elastic damping sleeve 7 presses against the top surface of the ultrasonic sensor housing 9.

[0028] During the test, the ultrasonic sensor housing 9 to be tested is installed in the elastic damping sleeve 7 of the slider 5, and the slider 5 is placed in the sliding grooves 131 of the pair of vertical rails 13. When placing, make the bottom plate 9a of the ultrasonic sensor housing 9 close to the probe core side, and the slider 5 will automatically slide along the sliding grooves 131 of the pair of vertical rails 13 to the test position. After starting the sound source box 4 and the microphone 3, the ultrasonic wave emitted by the probe core 41 of the sound source box 4 is received by the ultrasonic sensor housing 9 and generates resonance. The microphone 3 transmits the resonance frequency signal received by the ultrasonic sensor housing 9 to the industrial control computer, and the industrial control computer performs data analysis and comparison, so as to judge whether the ultrasonic sensor housing 9 to be tested meets the design requirements or whether the frequency consistency is good, and thus problems can be discovered early and the losses of the production line can be reduced.

[0029] In the embodiment of the present utility model, the ultrasonic sensor housing to be tested can be replaced very quickly by means of a slider. The sound source box for emitting ultrasonic waves and the microphone for receiving ultrasonic waves do not need to be adjusted during the test, which improves the frequency test efficiency of the ultrasonic sensor housing. In actual work, it can be realized that it takes about 5 to 8 seconds to measure one ultrasonic sensor housing, quickly judge whether it meets the design requirements, and thus decide whether to carry out subsequent processes.

[0030] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. An ultrasonic sensor housing frequency test fixture, characterized in that: It includes a slider seat, a microphone fixing block, a microphone, a sound source box and a slider; The slider seat comprises a base portion, a microphone support seat and a pair of vertical rails; the microphone support seat is arranged on the base portion, the microphone fixing block is pressed on the microphone support seat and is detachably connected to the microphone support seat, and a positioning cavity is formed between the microphone fixing block and the microphone support seat for the microphone to pass through and position; the pair of vertical rails are located at the rear of the microphone support seat and are connected to the base portion, and the pair of vertical rails are spaced and opposite to each other; The microphone passes through and is positioned in the positioning cavity; The sound source box is located behind a pair of vertical rails and is detachably connected to the pair of vertical rails, and a core probe is provided on the front of the sound source box; The slider is provided with a positioning hole for positioning the ultrasonic sensor housing to be tested, and the slider can automatically slide along the pair of vertical rails to a predetermined test position, where the ultrasonic sensor housing to be tested faces the probe core and the microphone respectively.

2. The ultrasonic sensor housing frequency test fixture according to claim 1, characterized in that: An elastic vibration-damping sleeve is embedded in the positioning hole. The elastic vibration-damping sleeve is made of elastic non-metallic material and is ring-shaped and is used to be sleeved outside the upper part of the ultrasonic sensor housing to position the ultrasonic sensor housing.

3. The ultrasonic sensor housing frequency test fixture according to claim 2, characterized in that: The top end of the ultrasonic sensor housing under test has an annular flange protruding radially outward; The top opening of the central through hole of the elastic vibration damping sleeve has an annular lip protruding inwardly, and the hole wall of the central through hole of the elastic vibration damping sleeve is provided with an annular groove matching the annular flange of the ultrasonic sensor housing adjacent to the annular lip.

4. The ultrasonic sensor housing frequency test fixture according to claim 2, characterized in that: The hole wall of the positioning hole is provided with an annular groove extending in the circumferential direction; An annular protrusion extending in the circumferential direction is provided on the outer circumferential surface of the elastic vibration-damping sleeve, and the annular protrusion is embedded in the annular groove.

5. The ultrasonic sensor housing frequency test fixture according to claim 2, characterized in that: The elastic vibration-damping sleeve is made of rubber.

6. The ultrasonic sensor housing frequency test fixture according to claim 1, characterized in that: The opposite surfaces of the pair of vertical rails are respectively provided with vertically extending slide grooves, and stoppers are arranged in the slide grooves; the sliding block slides along the pair of vertical rails and reaches the predetermined test position when being stopped by the stoppers.

7. The ultrasonic sensor housing frequency test fixture 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.

8. The ultrasonic sensor housing frequency test fixture according to claim 1, characterized in that: The microphone fixing block is detachably connected to the microphone supporting seat via a plurality of fasteners.

9. The ultrasonic sensor housing frequency test fixture according to claim 1, characterized in that: The shell of the sound source box is detachably connected to the pair of vertical rails via a plurality of fasteners.

10. The ultrasonic sensor housing frequency test fixture according to claim 1, characterized in that: The base portion, the microphone support seat and the pair of vertical rails are integrally formed.

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