CN112161693A - Method for detecting vibration frequency of electric toothbrush - Google Patents
Method for detecting vibration frequency of electric toothbrush Download PDFInfo
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- CN112161693A CN112161693A CN202010922653.0A CN202010922653A CN112161693A CN 112161693 A CN112161693 A CN 112161693A CN 202010922653 A CN202010922653 A CN 202010922653A CN 112161693 A CN112161693 A CN 112161693A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention discloses a method for detecting the vibration frequency of an electric toothbrush, which comprises the steps of selecting a measuring point on a sample to be detected, arranging a reflective sticker at the measuring point, detecting the position change of the reflected light of the measuring point of the sample to be detected in vibration by a laser displacement sensor through a triangular measuring method, and calculating the vibration frequency of the sample to be detected according to the position change data. The invention measures the vibration frequency of the electric toothbrush by capturing the change data of the position of the reflected light of the measuring point along with the time, provides a new idea for the detection of the vibration frequency of the electric toothbrush, can achieve high precision and good detection repeatability as long as the sampling frequency is high enough, does not need to know the rated reference value of the sample to be detected in advance, and has small limitation.
Description
Technical Field
The invention relates to the technical field of household appliance performance detection, in particular to a method for detecting the vibration frequency of an electric toothbrush.
Background
With the increasing pace of consumer development, more and more consumers seek higher quality of life, and the attention on oral health is rising, so that the electric toothbrush is popular among consumers as one of the main products of personal care. However, the performance of products on the market is not uniform, the truth and falseness of similar information, which is declared by manufacturers that the vibration frequency of the electric toothbrush can reach 3 ten thousand times per minute, is difficult to distinguish, and suitable assessment standards and detection methods are also lacking at home and abroad, so that a detection method and a detection device for the vibration working conditions (such as the vibration frequency, the vibration amplitude and the like) of the electric toothbrush need to be developed. Detection is performed by an LED stroboscope in the prior art. The stroboscope is an optical measuring instrument which controls a light source to emit light and rapidly flashes at a specific frequency. The stroboscope can emit short-time and frequent flashes, and when the flash frequency is close to or synchronous with the rotation or movement speed of the object to be detected, the surface quality or the operation condition of the high-speed moving object can be easily observed by using the persistence of vision or video synchronization of eyes. However, the method is limited by subjective factors of testers, and the nominal vibration frequency of the tested sample needs to be known in advance, so that the detection method has certain limitations.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided is a method for detecting the vibration frequency of an electric toothbrush without knowing a reference value of a sample to be measured in advance.
The technical scheme adopted by the invention is as follows: a method for detecting vibration frequency of an electric toothbrush comprises the steps of selecting a measuring point on a sample to be detected, arranging a reflective sticker at the measuring point, detecting position change of reflected light of the measuring point of the sample to be detected in vibration by a laser displacement sensor through a triangulation method, and calculating the vibration frequency of the sample to be detected according to position change data.
The vibration frequency of the measured sample is specifically calculated by the following formula:
wherein:
fvibration: representing the brush head reciprocating frequency or brush head rotating frequency of the electric toothbrush in times/minuteRepresents;
m: representing the time point grid number of the reference position point of the A-point displacement time chart recorded when the calculation is started;
n: representing the time point grid number of the point when the recorded A-point displacement time diagram reaches the same reference position point after 1 period;
fsampling: the sampling frequency of the laser displacement sensor is shown, and the unit is kHz.
The position of the measuring point A is recommended to be selected in the middle of the side face of the electric toothbrush head. Considering that most electric toothbrush brush heads are circular arc-shaped, the middle part of the side surface is selected to directly irradiate a laser spot on a horizontal tangent line of the side surface of the brush head, namely a laser ray is vertical to the horizontal tangent line of the circular arc, so that the measurement error is reduced.
The recommended size of the reflective sticker is close to the size of a light spot of the laser displacement sensor, wherein the light spot is projected on the measured sample.
In the detection, the electric toothbrush is arranged on the electric toothbrush fixing bracket; the electric toothbrush fixing bracket structure is preferably as follows: including erectting in test platform's slide bar one, slidable mounting is slider one on slide bar one, slider one is fixed a position through the locking bolt, slider one vertically cuts into two parts, constitutes two clamp splices, and two clamp splices pass through the screw rod and link to each other together, and through the suit the butterfly nut on the screw rod is adjusted and is pressed from both sides tightly, is equipped with curved bayonet socket between the opposite face of two clamp splices respectively, and curved bayonet socket surface subsides are equipped with the silica gel cushion that thickness is greater than 20mm for the simulation hand grips electric toothbrush, avoids wearing and tearing toothbrush, and more importantly reduces the influence to electric toothbrush vibration frequency.
During detection, the laser displacement sensor is suspended above a tested sample fixed on the electric toothbrush fixing bracket through a sensor bracket and is opposite to the tested sample; the structure of the sensor holder is preferably as follows: the laser displacement sensor comprises a suspension consisting of two parallel sliding rods and two supporting frames for supporting suspension test platform suspension.
The sensor bracket can provide position movement for the sensor in three directions, namely, up and down, left and right, and front and back. The support is matched with the electric toothbrush fixing support, so that the up-down distance difference between the sensor and the measured sample can be better adjusted. The rough adjustment is generally realized by moving a sliding block I of the electric toothbrush fixing support, and the fine adjustment is realized by rotating a screw rod of a screw rod.
And the data acquired by the laser displacement sensor is automatically uploaded to a PC upper computer, the PC upper computer draws a vibration waveform diagram of the measuring point according to the uploaded data, and the frequency of the measuring point vibrating along with the measured sample can be obtained according to the vibration waveform diagram.
The method is implemented through a test box and a PC upper computer, the test box comprises a box body, and a power module and a communication controller which are arranged on the inner side of the box body, control panels of the power module and the communication controller are respectively displayed through hollow areas of a side panel and a front panel of the test box, a top plate of the test box is the test platform, the power module is connected with the communication controller and the laser displacement sensor to provide working power for the communication controller and the laser displacement sensor, the laser displacement sensor is connected with the communication controller, and the communication controller is connected with the PC upper computer. The structure ensures that the operation is convenient and not messy in the implementation process of the invention.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention measures the vibration frequency of the electric toothbrush by capturing the change data of the position of the reflected light of the measuring point along with the time, provides a new idea for the detection of the vibration frequency of the electric toothbrush, and can achieve very high precision and good detection repeatability as long as the sampling frequency is high enough (at least two times higher than the vibration frequency of the toothbrush according to the sampling theorem, which is easily achieved, the vibration frequency of the existing toothbrush is usually only tens of thousands of times per minute, but the sampling frequency which can be achieved by the existing sampling technology is far higher than the sampling frequency), and has small limitation without knowing the rated reference value of the sample to be detected in advance.
2) The sensor and the tested sample are fixed by the bracket, and the test data is automatically collected by the sensor, so that the artificial influence factor is small, and the accuracy and the reliability are high;
3) according to the invention, data are automatically recorded through the PC upper computer, and detection personnel can conveniently analyze, process and store the data;
4) the laser displacement sensor and the electric toothbrush fixing bracket can well support the position adjustment of the toothbrush and the sensor;
5) the invention has convenient operation and no disorder in vision in the testing process.
Drawings
FIG. 1 is a schematic view showing the overall structure of a preferred embodiment of an apparatus for carrying out the method of the present invention;
FIG. 2 is a schematic view of the structure of the electric toothbrush mounting bracket of FIG. 1;
FIG. 3 is a schematic diagram of the detection principle of triangulation based on laser displacement sensors;
FIG. 4 is a graph showing displacement of the measuring point versus time, i.e., a vibration waveform.
Detailed Description
The method for detecting the vibration frequency of the electric toothbrush of the present embodiment is implemented by the detection device of fig. 1. As shown in fig. 1, the detection device comprises a power module, a laser displacement sensor 1, a communication controller, a notebook computer 5, a sensor bracket 2 and an electric toothbrush fixing bracket 3. The electric toothbrush fixing support 3 is used for fixing a tested sample 4. The laser displacement sensor 1 is suspended above a sample 4 to be measured fixed to the electric toothbrush fixing bracket 3 by the sensor bracket 2, and faces the sample to be measured. And the power supply module is connected with the communication controller and the laser displacement sensor 1 and provides working power supply for the communication controller and the laser displacement sensor. The laser displacement sensor 1 is connected with a communication controller, and the communication controller is connected with a notebook computer 5.
As shown in fig. 2, the electric toothbrush fixing bracket 3 has the following structure: the electric toothbrush comprises a first sliding rod 31 vertically standing on a test platform 61, a first sliding block 32 slidably mounted on the first sliding rod 31, the first sliding block 32 is positioned through a locking bolt 33, the first sliding block 32 is longitudinally cut into two parts to form two clamping blocks, the two clamping blocks are connected together through a screw 34, the screw 34 is fixedly sleeved on the clamping block of the first sliding rod 31, the other clamping block is sleeved on the screw 34, the screw 34 penetrates through the clamping block sleeved with a butterfly nut 35 to adjust the clamping of the two clamping blocks, arc-shaped bayonets a are respectively arranged between opposite surfaces of the two clamping blocks, and silica gel cushions b with the thickness larger than 20mm are attached to the surfaces of the arc-shaped bayonets a and used for simulating hands to hold the electric toothbrush to avoid abrasion of the toothbrush and more importantly, the influence on the vibration frequency of the.
The structure of the sensor holder 2 is shown in fig. 1: the laser displacement sensor comprises a suspension 21 consisting of two parallel sliding rods II, and two supporting frames 22 for supporting the suspension 21 in a suspended manner, wherein the two supporting frames 22 are connected with two ends of the suspension 21, the laser displacement sensor further comprises two sliding rails 23 fixed on a test platform 61, the two supporting frames 22 are respectively slidably mounted on the test platform 61 through the two sliding rails 23, the sensor support 2 further comprises a second sliding block 24 and a set of screw rod 25, the second sliding block 24 is slidably mounted on the suspension 21, the screw rod 25 is mounted on the second sliding block 24, the laser displacement sensor 1 is mounted on a nut member 252 of the screw rod 25, and the laser displacement sensor 1 can be driven by the screw rod 25 to stably move up and down and can also move left and right along the suspension 21 along.
The mounting structure of the screw 25 is specifically as follows: the third sliding rod 26 is parallel to the screw 251 of the screw 25, and the upper ends of the third sliding rod 26 and the screw 251 are connected through a connecting piece 27, wherein the connecting piece 27 is fixed with the upper end of the third sliding rod 26 and is rotatably connected with the smooth section at the upper end of the screw 251. The upper end of the screw 251 is connected with a handle 7, so that the screw 251 can be operated to rotate conveniently. The second sliding block 24 is sleeved on the third sliding rod 26, the position relation of the second sliding block and the third sliding rod 26 is fixed, or the third sliding rod 26 can slide up and down under the action of external force, and the screw 251 penetrates through a vertical opening with a larger aperture formed in the second sliding block 24. Nut member 252 is slidably connected to runner three 26.
The upper sensor support 2 can provide position movement for the sensor 1 in three directions, namely up and down, left and right and front and back. In the up-down direction needing to be accurately adjusted, coarse adjustment can be realized by moving the first sliding block 32 of the electric toothbrush fixing support 3, and then fine adjustment of the up-down distance difference between the sensor and the measured sample can be realized by rotating the handle 7.
The detection device further comprises a detection box 6, a power module and a communication controller of the detection device are installed in the detection box 6, a control panel c of the communication controller is displayed through a hollow-out area of a front panel of the detection box 6, and a top plate of the detection box 6 is the test platform 61. The structure ensures that the invention is convenient to operate and is not messy during detection.
The above laser displacement sensor employs a laser displacement sensor of jk-H055, KEYENCE, japan, which detects a change in the position of reflected light using a principle of triangulation, as shown in fig. 3, and detects a change in the position of a target point on the brush head of the electric toothbrush, thereby detecting the vibration frequency of the electric toothbrush. The reference distance and the measurement range of the sensor are 50 +/-10 mm, the repetition precision can reach 0.025 mu m, and the sampling rate is as high as 50 kHz. The sampling theorem generally requires that the sampling rate be much higher than the vibration frequency of the electric toothbrush, at least twice the vibration frequency of the electric toothbrush. In practice, the vibration frequency of the electric toothbrush is generally tens of thousands of times per minute, so that the detection requirement of the electric toothbrush product can be met by selecting the sampling frequency of 5kHz or above. It can be seen that the sampling rate of the sensor is fully satisfactory.
The model of the communication controller is an LK-G5000 controller, and the communication controller is manufactured by the same manufacturer as the sensor. An I/O communication port of the communication controller is connected with an LK-H055 laser displacement sensor to achieve data acquisition and control instruction transmission, and an Ethernet communication interface 100Base-TX of the communication controller is connected with a notebook computer to achieve test data and instruction transmission between the communication controller and a PC upper computer.
The notebook computer adopts the Win7 and the systems above, is provided with LK-Navigator and Office Excel software so as to conveniently record and store vibration position data, and constructs a vibration frequency calculation model through the Office Excel software so as to conveniently calculate and analyze the vibration frequency of the electric toothbrush.
The specific detection process is as follows:
1) installation alignment
A tested sample 4 is arranged on an electric toothbrush fixing support 3 as shown in figure 1, and then the electric toothbrush fixing support 3 and a sensor support 2 are adjusted, so that light spots emitted by a laser displacement sensor 1 are just shot on a measuring point A on the side surface of a toothbrush head, and the distance between the measuring point A and the sensor is controlled to be within the range of 50 +/-10 mm. A reflective sticker is stuck at the measuring point A, and the size of the reflective sticker is preferably close to that of the light spot.
Note that: the toothbrush is mounted so that its vibration direction is in the same direction as the triangular focal point of the laser sensor. In this embodiment, the vibration direction of the toothbrush is required to fall in the vertical direction.
2) Starting a sample 4 to be tested, enabling the electric toothbrush (in a fully-charged state) to work in a strongest mode gear (generally, the one-time working duration of the electric toothbrush is about 3min), setting a sampling frequency 5kHz control instruction by a communication controller, transmitting the sampling frequency to a laser displacement sensor for sampling, transmitting sampling data to a notebook computer 5 through an Ethernet communication interface, recording the change relation of the displacement of a point A along with time in the vibration process of the electric toothbrush head of the sample 4 to be tested by the notebook computer 5 software, wherein the point 0 position represents the initial position when the point A starts to work, and the point H represents the initial position when the point A starts to work as shown in figuremaxThe maximum displacement of the point A from the initial position 0 in the stable periodic motion process is achieved in the gear working period of the strongest mode;
and finally, recording the vibration waveform formed by the point A of the sample to be detected through a notebook computer and software, as shown in fig. 4, and storing the vibration waveform in a CVS file format. Calling Office Excel software, and calculating 1min (T) after the waveform of the point A is stabilized1-T0) Within a time interval, the frequency of the periodic motion is the vibration frequency fVibrationThe specific calculation method is shown as formula (1):
wherein:
fvibration: indicating the frequency of reciprocation of the brush head or brush of the electric toothbrushHead rotation frequency, expressed in times/minute (or times/min), to single digit precision;
m: a time point grid number (grid position) indicating the time point at which the a-point displacement time chart reference position point recorded at the start of calculation is located;
n: representing the time point grid number of the point when the recorded A-point displacement time diagram reaches the same reference position point after 1 period;
fsampling: indicating the laser displacement sensor sampling frequency (kHz).
The calculation result can be repeatedly measured to obtain an average value, so that the accuracy of the detection result is improved.
In order to verify the detection accuracy of the method, the tested electric toothbrush with the rated vibration frequency of 38000 times/min is repeatedly measured for many times, the result and comparison data of the result and the measurement result of the existing LED stroboscope are shown in Table 1, and the result proves that: the method has higher accuracy and reliability of the detection result.
TABLE 1 comparative test of two test methods (unit: times/min)
The present invention is not limited to the above embodiments, and according to the above-mentioned contents, the present invention can make other equivalent modifications, substitutions or alterations (such as detecting the vibration amplitude of the brush head of the electric toothbrush) without departing from the basic technical idea of the present invention.
Claims (8)
1. A method for detecting vibration frequency of an electric toothbrush is characterized in that a measuring point is selected on a sample to be detected, a reflective sticker is arranged at the measuring point, then the position change of the reflected light of the measuring point of the sample to be detected in vibration is detected by a laser displacement sensor through a triangle measuring method, and the vibration frequency of the sample to be detected is calculated according to the position change data.
2. The method of claim 1, wherein the vibration frequency of the sample is calculated by the following formula:
wherein:
fvibration: representing the brush head reciprocating frequency or brush head rotating frequency of the electric toothbrush, expressed in times/minute;
m: representing the time point grid number of the reference position point of the A-point displacement time chart recorded when the calculation is started;
n: representing the time point grid number of the point when the recorded A-point displacement time diagram reaches the same reference position point after 1 period;
fsampling: the sampling frequency of the laser displacement sensor is shown, and the unit is kHz.
3. The method of claim 1, wherein the location of the test point is selected to be in the middle of the side of the head of the electric toothbrush.
4. The method of claim 1, wherein the size of the reflective sticker is close to the size of a light spot of the laser displacement sensor on the tested sample.
5. The method of detecting the vibration frequency of an electric toothbrush according to claim 1, wherein the electric toothbrush is mounted on a fixed bracket of the electric toothbrush in the detection; the electric toothbrush fixing support has the following structure: including erectting in test platform's slide bar one, sliding mounting is slider one on slide bar one, slider one is fixed a position through the locking bolt, slider one vertically cuts into two parts, constitutes two clamp splices, and two clamp splices pass through the screw rod and link to each other together, and through the suit the butterfly nut on the screw rod is adjusted and is pressed from both sides tightly, is equipped with curved bayonet socket between the opposite face of two clamp splices respectively, and curved bayonet socket surface subsides are equipped with the silica gel cushion that thickness is greater than 20 mm.
6. The method for detecting the vibration frequency of an electric toothbrush according to claim 5, wherein the laser displacement sensor is suspended above the sample to be detected fixed on the electric toothbrush fixing bracket through a sensor bracket in the detection, and is opposite to the sample to be detected; the sensor bracket has the following structure: the sensor support comprises a suspension consisting of two parallel sliding rods and two supporting frames for supporting suspension.
7. The method for detecting the vibration frequency of the electric toothbrush according to claim 6, wherein the data collected by the laser displacement sensor is automatically uploaded to a PC upper computer, the PC upper computer draws a vibration waveform diagram of the measuring point according to the uploaded data, and the frequency of the measuring point vibrating along with the measured sample can be obtained according to the vibration waveform diagram.
8. The method for detecting the vibration frequency of an electric toothbrush according to claim 7, wherein the method is implemented by a test box and a PC host computer, the test box comprises a box body, and a power module and a communication controller which are installed inside the box body, the control panels of the power module and the communication controller are respectively displayed through the hollow areas of the side panel and the front panel of the test box, the top plate of the test box is the test platform, the power module is connected with the communication controller and the laser displacement sensor to provide working power for the communication controller and the laser displacement sensor, the laser displacement sensor is connected with the communication controller, and the communication controller is connected with the PC host computer.
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| CN113267247A (en) * | 2021-04-21 | 2021-08-17 | 深圳市力博得科技有限公司 | Method and device for measuring vibration frequency of electric toothbrush and measuring instrument |
| CN113865687A (en) * | 2021-08-31 | 2021-12-31 | 青岛海尔空调器有限总公司 | Pipeline vibration testing device |
| CN116577123A (en) * | 2022-10-24 | 2023-08-11 | 广州星际悦动股份有限公司 | Swing testing method and system for electric toothbrush |
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