CN110604500A - Back of body of bathing of voiced sound suggestion is brushed - Google Patents
Back of body of bathing of voiced sound suggestion is brushed Download PDFInfo
- Publication number
- CN110604500A CN110604500A CN201910240292.9A CN201910240292A CN110604500A CN 110604500 A CN110604500 A CN 110604500A CN 201910240292 A CN201910240292 A CN 201910240292A CN 110604500 A CN110604500 A CN 110604500A
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- pin
- brush
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- pressure
- processing circuit
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K7/00—Body washing or cleaning implements
- A47K7/02—Bathing sponges, brushes, gloves, or similar cleaning or rubbing implements
- A47K7/022—Bathing sponges, brushes, gloves, or similar cleaning or rubbing implements for washing the back, e.g. bath straps
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Epidemiology (AREA)
- General Health & Medical Sciences (AREA)
- Brushes (AREA)
Abstract
The invention discloses a back brush with voice prompt for bathing, wherein a brush head of the back brush is connected with a brush handle through a connecting piece, and a pressure sensor, a signal processing circuit board and a rechargeable lithium battery are arranged in an inner cavity of the brush handle. The pressure sensor is provided with a cantilever beam type elastic body and 4 metal foil type strain gauges forming a Wheatstone bridge structure; the pressure between the brush head and the skin of the human body is transmitted to the pressure sensor through the connecting piece, and the output voltage of the Wheatstone bridge is changed; the signal processing circuit board is provided with a Wheatstone bridge signal processing circuit, a buzzer driving circuit and a lithium battery charging circuit; the back brush with the voice prompt function can detect the pressure of the brush head on the skin in real time when people brush the back in a bath, and compares the detected pressure with a pressure threshold value, when the detected pressure is higher than the pressure threshold value, the back brush automatically sends out the prompt voice, and the condition that the skin is damaged due to excessive force when people brush the back in the bath can be effectively avoided.
Description
Technical Field
The invention belongs to the field of daily necessities, and particularly relates to a back washing brush capable of detecting the pressure of a brush head on the skin of a human body during back washing and automatically giving out prompt sound when the pressure is too high.
Background
Many people have the habit of rubbing and brushing the back when taking a bath, and often exert too much force inadvertently, and the skin is found to be red and swollen and damaged after the bath. Different from a general back brush, the back brush with the voice prompt can detect the pressure of the brush head on the skin of a human body in real time when people take a bath to brush the back, automatically sends out the prompt voice when the pressure is too high, and can avoid the damage to the skin caused by careless exertion when the back is brushed. When the back brush with the voice prompt is applied, on one hand, the problem of how to detect the pressure of the brush head on the skin is solved; on the other hand, the problems of power supply and water prevention of the pressure detection circuit and the sound prompt circuit are solved.
At present, a back brush used in daily life does not have the pressure detection and sound reminding functions, people can only control strength according to self feeling when brushing the back, the back brush is often heavier, and the situation that the skin is damaged and the body health is affected due to overlarge force can occur.
Disclosure of Invention
The invention aims to provide a back brush which can detect the pressure of a brush head on the skin of a human body in real time when the back of the back brush is washed, and can automatically give out a prompt sound when the pressure is overlarge. Avoid the damage to the skin caused by excessive force when brushing the back and the influence on the health.
In order to achieve the purpose, the invention adopts the following technical scheme: a back brush with a sound prompt comprises a brush head and a brush handle. The brush head and the brush handle are detachably connected, and a miniature cantilever type pressure detection sensor, a signal processing circuit board and a rechargeable lithium battery are installed in the brush handle.
The brush head can be connected with the brush handle through a connecting piece, an inner cavity is processed inside the brush handle, and a miniature cantilever type pressure detection sensor, a signal processing circuit board and a rechargeable lithium battery are installed in the inner cavity.
The brush head is tightly connected with the brush handle through the connecting piece, and the pressure of the brush head on the skin is transmitted to the miniature cantilever type pressure detection sensor in the inner cavity of the brush handle through the connecting piece. The miniature cantilever type pressure detection sensor comprises a cantilever type elastic body, a resistance type strain gauge and a lead.
The signal processing circuit board comprises a signal processing circuit for processing bridge signals in the miniature cantilever type pressure sensor, a buzzer prompt tone driving circuit and a charging interface circuit of a rechargeable lithium battery.
The signal processing circuit comprises a connecting terminal P1 connected with a Wheatstone bridge formed by a resistance type strain gage, pins 3 and 4 of the connecting terminal P1 are respectively connected with GND and 4.2V voltage sources, pins 1 and 2 of the connecting terminal P1 are respectively connected with resistors R5 and R6 as S +, S-output ends of bridge signals, the resistors R5 and R6 are respectively connected with GND through capacitors C2 and C3, the resistors R5 and R6 are also respectively connected with pins 3 and 2 of a signal amplifier U1, the model of the signal amplifier U1 is AD620, the pin 1 of the signal amplifier U1 is sequentially connected with the pin 8 of the signal amplifier U1 through the resistor R8 and the potentiometer R9, the pin 7 of the signal amplifier U1 is respectively connected with the 4.2V voltage source and the capacitor C1, and the pin 5 is connected with the 2.5V voltage source. The resistor R4 is connected with the input end of the resistor R2 through the potentiometer R3 and the resistor R1, and the potentiometer R3 is also connected with GND through the resistor R2.
The buzzer warning tone driving circuit comprises an operational amplifier U2 connected with an amplifier U1, the type of U2 is OP07, a pin 3 of U2 is connected with a pin 7 of U1, a pin 2 of U2 is connected with a resistor divider formed by a potentiometer R13 and a resistor R14, pins 7 and 4 of U2 are respectively connected with a 4.2V voltage source and GND, a pin 6 of U2 is connected with the base electrode of an NPN type triode Q1 through a resistor R7, the type of the NPN type triode Q1 is 9013, the collector electrode of Q1 is connected with the negative electrode of a buzzer LS1, the emitter electrode of Q1 is connected with GND, and the positive electrode of the buzzer LS1 is connected with the 4.2V voltage source.
The charging interface circuit of the rechargeable lithium battery comprises a rectifier bridge D1, a live wire L of 220V alternating current is connected with a pin 4 of a D1 through a resistor R10 and a capacitor C4, a zero line N of the 220V alternating current is connected with a pin 2 of the D1, pins 1 and 3 of a D1 are respectively connected with the positive pole and the negative pole of an electrolytic capacitor C5, the positive pole and the negative pole of the electrolytic capacitor C5 are simultaneously connected with pins 3 and 2 of a power reference D2, the model of the power reference D2 is TL431, the pin 1 of the D2 is connected with resistors R11 and R12, the other two ends of the resistors R11 and R12 are respectively connected with pins 1 and 2 of a connecting terminal P2, the connecting terminal P2 is a charging connecting terminal of the lithium battery, and the pins 1 and 2 of the P2 are respectively 4.2V voltage source and GND.
Among the above-mentioned technical scheme, placed pressure sensor's elastomer in the inside cavity of brush holder, installed 4 metal foil formula foil gauges on the elastomer, constitute wheatstone bridge structure and be used for pressure measurement. When the back brush is used, the brush head is in contact with the skin and generates pressure on the skin, the pressure is transmitted to the elastic body in the brush handle through the brush head and the connector, so that the elastic body and the 4 metal foil type strain gauges stuck on the elastic body are deformed, a mV-level voltage signal output by a Wheatstone bridge formed by the metal foil type strain gauges is correspondingly changed, and the change of output voltage is in a linear relation with the pressure. The mV level voltage signal output by the Wheatstone bridge is amplified in amplitude by the operational amplifier, and then is compared with a preset pressure threshold value by the voltage comparator, when the pressure is higher than the preset threshold value, the output of the voltage comparator drives the buzzer to sound, and the prompt force is too large. The pressure threshold is a value obtained through a plurality of experimental measurements, and when the contact pressure of the brush head and the skin exceeds the value, damage can be caused to the skin.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram of the working principle of the present invention;
FIG. 3 is a schematic diagram of a signal processing circuit and a buzzer driving circuit of the signal processing circuit board;
fig. 4 is a schematic diagram of a lithium battery charging circuit of the signal processing circuit board.
Detailed Description
The invention is further described with reference to the accompanying drawings 1-4:
a back brush with a voice prompt is characterized in that a brush head 1 is connected with a pressure sensor 7 in a brush handle 3 through a connecting piece 2, when the back brush is used, the pressure between the brush head 1 and the skin is transmitted to the pressure sensor 7 through the connecting piece 2, an elastic body 8 of the pressure sensor 7 is slightly deformed, the output voltage of a Wheatstone bridge consisting of 4 metal foil type strain gauges 9 adhered to the elastic body 8 correspondingly changes, the change of the voltage and the pressure between comb teeth 1 and the scalp are approximately in a linear relation, and the pressure can be detected by detecting the change of the voltage. The output voltage signal of the pressure sensor 7 is output to a signal processing circuit board 11 through a cable 10 for amplitude amplification and voltage comparison, and when the pressure exceeds a set threshold value, a buzzer 12 is driven to give an alarm prompt sound. The rechargeable lithium battery 5 provides power supply for the pressure sensor 7 and the signal processing circuit board 11, and the charging interface 6 is used for connecting an external power supply to supply power for the lithium battery 5. A cavity 4 is formed in the comb handle 3, and the cavity 4 is used for providing a placing space for the pressure sensor 7, the signal processing circuit board 11 and the lithium battery 5.
Fig. 2 is a working principle block diagram of the present invention, the contact pressure between the brush head 1 and the skin is transmitted to the pressure sensor 7 in the brush handle 3 through the connecting piece 2, the output signal of the pressure sensor 7 is a mV-level differential voltage signal, the mV-level differential voltage signal is amplified by the operational amplifier on the signal processing circuit board 11, and is compared with a preset pressure threshold value through the voltage comparator on the signal processing circuit board 11, if the comparison result is higher than the pressure threshold value, the buzzer driving circuit on the signal processing circuit board 11 is connected to drive the buzzer 12 to emit a warning sound, and if the comparison result is lower than the pressure threshold value, the buzzer driving circuit on the signal processing circuit board 11 is not connected, and the buzzer 12 does not emit a warning sound. The rechargeable lithium battery 5 provides power supply for the pressure sensor 7 and each functional component on the signal processing circuit board 11, and comprises: a Wheatstone bridge formed by the strain gauges 9, a signal processing circuit on the signal processing circuit board 11 and a buzzer driving circuit.
Fig. 3 is a schematic diagram of a signal processing circuit and a buzzer driving circuit on the signal processing circuit board 11 according to the present invention, and a circuit for implementing the above functions is located on the signal processing circuit board 11; the connecting terminal P1 is connected with a Wheatstone bridge formed by the strain gauge 9, 2 pins of the P1 are respectively connected with a 4.2V voltage source and GND, and the other two pins are output signals S-and S + of the Wheatstone bridge; the resistors R1, R2, R4 and the potentiometer R3 form a zero setting circuit which is connected with an output signal S-of the bridge; r5 and C2, R6 and C3 respectively form RC low-pass filters which are used for low-pass filtering before bridge output signals S-and S + enter a signal amplifier U1 to remove a part of high-frequency interference signals; the model of the signal amplifier U1 is AD620, which mainly amplifies the differential millivolt signal output by the bridge, the No. 5 pin is a reference voltage input end and is connected with 2.5V reference voltage, when the bridge is balanced, the U1 outputs 2.5V; u2 is an operational amplifier OP07, which is used to form a voltage comparator, and compares the voltage signal amplified by U1 with a preset voltage threshold; the potentiometer R13 and the resistor R14 form a resistor voltage divider, the output of which is connected to the pin 2 of U2 as a threshold voltage, and the output voltage of U1 is connected to the pin 3 of U2 through the pin 6; the resistor R7 and the NPN type triode Q1 form a buzzer driving circuit; when the voltage of a pin 3 of the U2 is higher than the voltage of a pin 2, a pin 6 of the U2 outputs a high level, a triode Q1 is conducted, the power supply of a buzzer LS1 is switched on, and a prompt tone is given; when the voltage of the pin 3 of the U2 is lower than the voltage of the pin 2, the pin 6 of the U2 outputs low level, the triode Q1 is cut off, the buzzer LS1 is not powered on, and no prompt sound is emitted.
Fig. 4 is a schematic diagram of a lithium battery charging circuit on the signal processing circuit board 11 according to the present invention, and a circuit for implementing the above functions is located on the signal processing circuit board 11; the resistor R10 and the capacitor C4 are used for limiting charging current, so that the lithium battery is prevented from being damaged due to overlarge current; the 220V alternating current is converted into direct current after passing through a rectifier bridge D1, and an electrolytic capacitor C5 plays a role in direct current filtering; the controllable precise voltage-stabilizing source D2 is in a TL431 model and is used for providing stable 4.2V charging voltage for the lithium battery 5, and the relation between the output voltage Vout between pins 3 and 2 of the TL431 and the resistors R11 and R12 is as follows:
the resistor R11 is a resistor with a resistance of 1.7k, and the resistor R12 is a resistor with a resistance of 2.5k, so that the voltage between the TL431 pins 3 and 2 is kept at 4.2V and is used as the charging voltage of the lithium battery. Pins 1 and 2 of the connecting terminal P2 are respectively connected with the positive electrode and the negative electrode of the lithium battery.
In conclusion, the invention realizes the functions of detecting the pressure of the brush head on the skin in real time when the back of the bath brush is washed and automatically giving out the prompt tone when the pressure is higher than the pressure threshold value. Firstly, a pressure sensor is arranged in the brush handle, so that the pressure of the brush head is detected; and secondly, by designing a signal processing circuit and a buzzer driving circuit, the function of automatically giving out prompt sound when the pressure of the brush head exceeds a threshold value is realized. When people exert too much force in the process of brushing the back, the back brush can make a sound to remind, so that the situation that the skin is damaged and the body health is influenced due to the fact that the excessive force is exerted when the back is brushed can be effectively avoided.
Claims (4)
1. The utility model provides a take voice prompt's back of body brush of bathing which characterized in that: the brush head (1) is connected with the pressure sensor (7) inside the brush handle (3) through the connecting piece (2), when bathing, the pressure between the brush head (1) and the skin is transmitted to the pressure sensor (7) through the connecting piece (2), so that the elastic body (8) of the pressure sensor (7) generates micro-deformation, the output voltage of a Wheatstone bridge consisting of 4 metal foil type strain gauges (9) adhered on the elastic body (8) also correspondingly changes, the change of the voltage and the pressure between the brush head (1) and the skin are approximately in a linear relation, and the pressure can be detected by detecting the change of the voltage.
2. The bathing back brush with voice prompt of claim 1, wherein: an output voltage signal of the pressure sensor (7) is output to a signal processing circuit board (11) through a cable (10), amplitude amplification and voltage comparison are carried out through a signal processing circuit, and when the pressure exceeds a set threshold value, a buzzer (12) is driven through a buzzer driving circuit to give out an alarm prompt sound; the rechargeable lithium battery (5) provides power supply for the pressure sensor (7) and the signal processing circuit board (11), and the charging interface (6) is used for connecting an external power supply to supply power for the lithium battery (5); a cavity (4) is formed in the comb handle (3), and the cavity (4) is used for providing a placing space for the pressure sensor (7), the signal processing circuit board (11) and the lithium battery (5).
3. The bathing back brush with voice prompt of claim 2, wherein: the signal processing circuit is positioned on the signal processing circuit board (11) and comprises a connecting terminal P1 connected with a Wheatstone bridge formed by the resistance strain gauge (9), pins 3 and 4 of the wiring terminal P1 are respectively connected with GND and 4.2V voltage sources, the pins 1 and 2 of the connecting terminal P1 are respectively used as the S + and S-output terminals of a bridge signal to be connected with the resistors R5 and R6, the resistors R5 and R6 are respectively connected with GND through capacitors C2 and C3, the resistors R5 and R6 are also respectively connected with pins 3 and 2 of a signal amplifier U1, the model of the signal amplifier U1 is AD620, the pin 1 of the signal amplifier U1 is connected with the pin 8 of the signal amplifier U1 through a resistor R8 and a potentiometer R9 in sequence, a pin 7 of the signal amplifier U1 is respectively connected with a 4.2V voltage source and a capacitor C1, and a pin 5 is connected with a 2.5V voltage source; the resistor R4 is connected with the input end of the resistor R2 through the potentiometer R3 and the resistor R1, and the potentiometer R3 is also connected with GND through the resistor R2.
4. The bathing back brush with voice prompt of claim 2, wherein: the buzzer driving circuit is positioned on a signal processing circuit board (11) and comprises an operational amplifier U2 connected with an amplifier U1, the type of U2 is OP07, a pin 3 of U2 is connected with a pin 7 of U1, a pin 2 of U2 is connected with a resistor divider formed by a potentiometer R13 and a resistor R14, pins 7 and 4 of U2 are respectively connected with a 4.2V voltage source and GND, a pin 6 of U2 is connected with the base electrode of an NPN triode Q1 through a resistor R7, the type of the NPN triode Q1 is 9013, the collector of Q1 is connected with the negative electrode of a buzzer LS1, the emitter of Q1 is connected with GND, and the positive electrode of the buzzer LS1 is connected with a 4.2V voltage source; the potentiometer R13 and the resistor R14 form a resistor voltage divider, the output of which is connected to the pin 2 of U2 as a threshold voltage, and the output voltage of U1 is connected to the pin 3 of U2 through the pin 6; when the voltage of a pin 3 of the U2 is higher than the voltage of a pin 2, a pin 6 of the U2 outputs a high level, a triode Q1 is conducted, the power supply of a buzzer LS1 is switched on, and a prompt tone is given; when the voltage of the pin 3 of the U2 is lower than the voltage of the pin 2, the pin 6 of the U2 outputs low level, the triode Q1 is cut off, the buzzer LS1 is not powered on, and no prompt sound is emitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240292.9A CN110604500A (en) | 2019-03-19 | 2019-03-19 | Back of body of bathing of voiced sound suggestion is brushed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240292.9A CN110604500A (en) | 2019-03-19 | 2019-03-19 | Back of body of bathing of voiced sound suggestion is brushed |
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| Publication Number | Publication Date |
|---|---|
| CN110604500A true CN110604500A (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910240292.9A Pending CN110604500A (en) | 2019-03-19 | 2019-03-19 | Back of body of bathing of voiced sound suggestion is brushed |
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Application publication date: 20191224 |