阅读说明：本技术 压力检测提醒梳子 (Pressure detection reminding comb ) 是由 罗少轩 乔爱民 尹安 于 2019-02-26 设计创作，主要内容包括：本发明公开了一种压力检测提醒梳子,梳子的梳齿和梳柄通过连接件连接,在梳柄的内腔中安装有压力传感器、信号处理电路板和可充电式锂电池。所述的压力传感器中设置有悬臂梁式弹性体和构成惠更斯电桥结构的4片金属箔式应变片；梳齿与头皮间的压力通过连接件传递到所述压力传感器,并引起惠更斯电桥输出电压变化；所述的信号处理电路板上设置有惠更斯电桥信号处理电路、蜂鸣器驱动电路和锂电池充电电路；压力检测提醒梳子可以在梳头时实时检测梳齿对头皮的压力,并与压力阈值进行比较,当检测到的压力高于压力阈值时,自动发出提示声音,能有效避免梳头时因用力过大而对头皮造成损伤的情况。(The invention discloses a pressure detection reminding comb, wherein comb teeth of the comb are connected with a comb 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 comb 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 comb teeth and the scalp 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 pressure detection reminding comb can detect the pressure of comb teeth on the scalp in real time when the comb is used for combing, and compares the pressure with a pressure threshold value, when the detected pressure is higher than the pressure threshold value, the pressure detection reminding comb automatically sends out prompting sound, and the condition that the scalp is damaged due to excessive force during combing can be effectively avoided.)

1. The utility model provides a pressure detection reminds comb which characterized in that: the comb teeth (1) are connected with a pressure sensor (7) in the comb handle (3) through a connecting piece (2), when combing, the pressure between the comb teeth (1) and the scalp is transmitted to the pressure sensor (7) through the connecting piece (2), so that an 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 comb teeth (1) and the scalp form an approximate linear relation, and the pressure can be detected by detecting the change of the voltage.

2. The pressure detection reminding comb according to 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 pressure detection reminding comb according to 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 pressure detection reminding comb according to 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.

Technical Field

The invention belongs to the field of daily necessities, and particularly relates to a pressure detection reminding comb which can detect the pressure of comb teeth on scalp in real time during combing and automatically give out a reminding sound when the pressure is too high.

Background

Different from a common comb, the pressure detection reminding comb can detect the pressure of comb teeth on scalp in real time when the comb is used for combing, automatically sends out a prompting sound when the pressure is too high, and can avoid damage to the scalp caused by careless exertion of too high force during combing. When the pressure detection comb is applied, on one hand, the problem of how to detect the pressure of the comb teeth on the scalp is solved; on the other hand, the problem of power supply of the pressure detection circuit and the sound prompt circuit is solved.

At present, a comb used in daily life does not have the pressure detection and sound reminding functions, people can only control strength by feeling when combing hair, and the scalp is damaged by excessive force when combing hair, so that the physical health is affected.

Disclosure of Invention

The invention aims to provide a pressure detection comb which can detect the pressure of comb teeth on scalp in real time during combing and can automatically give out prompt sound when the pressure is too high. Avoid the damage to the scalp caused by excessive force during combing the hair, and the influence on the health of the body.

In order to achieve the purpose, the invention adopts the following technical scheme: a pressure detection reminding comb comprises comb teeth and a comb handle. The comb teeth and the comb 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 comb handle.

The comb teeth can adopt various conventional tooth types and are connected with the comb handle through a connecting piece. An inner cavity is processed in the comb handle, and a micro cantilever type pressure detection sensor, a signal processing circuit board and a rechargeable lithium battery are arranged in the inner cavity.

The comb teeth are tightly connected with the comb handle through the connecting piece, and the pressure of the comb teeth on the scalp is transmitted to the miniature cantilever type pressure detection sensor in the inner cavity of the comb 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 comb handle, installed 4 metal foil formula foil gauges on the elastomer, constitute wheatstone bridge structure and be used for pressure measurement. When the comb is used for combing, the comb teeth are in contact with the scalp and generate pressure on the scalp, the pressure is transmitted to the elastic body in the comb handle through the comb teeth and the connector, so that the elastic body and the 4 metal foil type strain gauges pasted 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 and the pressure are in a linear relation. 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 value is a value obtained by a plurality of experimental measurements, and when the contact pressure of the comb teeth and the scalp exceeds the value, damage may be caused to the scalp.

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 figures 1-4:

a pressure detection reminding comb, as shown in figure 1, the comb teeth 1 are connected with a pressure sensor 7 in a comb handle 3 through a connecting piece 2, when combing, the pressure between the comb teeth 1 and the scalp 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 on the elastic body 8 is correspondingly changed, the change of the voltage and the pressure between the 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 block diagram of the operation principle of the present invention, the contact pressure between the comb teeth 1 and the scalp is transmitted to the pressure sensor 7 in the comb handle 3 through the connecting member 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 to the buzzer 12, 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 comb teeth on the scalp in real time during combing and automatically giving out prompt sound when the pressure is higher than the pressure threshold value. Firstly, a pressure sensor is arranged in the comb handle, so that the pressure of the comb teeth 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 comb tooth pressure exceeds a threshold value is realized. When people exert too much force during the process of combing, the comb can make a sound to remind, so that the condition that the scalp is damaged and the body health is influenced due to the fact that the excessive force is exerted during combing can be effectively avoided.